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tracepoint: Fix sparse warnings in tracepoint.c
[linux/fpc-iii.git] / include / net / xfrm.h
blob32682ae47b3fe6d88e7750120089efc791b38894
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 #ifdef CONFIG_NET_NS
130 struct net *xs_net;
131 #endif
132 union {
133 struct hlist_node gclist;
134 struct hlist_node bydst;
135 };
136 struct hlist_node bysrc;
137 struct hlist_node byspi;
138
139 atomic_t refcnt;
140 spinlock_t lock;
141
142 struct xfrm_id id;
143 struct xfrm_selector sel;
144 struct xfrm_mark mark;
145 u32 tfcpad;
146
147 u32 genid;
148
149 /* Key manager bits */
150 struct xfrm_state_walk km;
151
152 /* Parameters of this state. */
153 struct {
154 u32 reqid;
155 u8 mode;
156 u8 replay_window;
157 u8 aalgo, ealgo, calgo;
158 u8 flags;
159 u16 family;
160 xfrm_address_t saddr;
161 int header_len;
162 int trailer_len;
163 u32 extra_flags;
164 } props;
165
166 struct xfrm_lifetime_cfg lft;
167
168 /* Data for transformer */
169 struct xfrm_algo_auth *aalg;
170 struct xfrm_algo *ealg;
171 struct xfrm_algo *calg;
172 struct xfrm_algo_aead *aead;
173
174 /* Data for encapsulator */
175 struct xfrm_encap_tmpl *encap;
176
177 /* Data for care-of address */
178 xfrm_address_t *coaddr;
179
180 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
181 struct xfrm_state *tunnel;
182
183 /* If a tunnel, number of users + 1 */
184 atomic_t tunnel_users;
185
186 /* State for replay detection */
187 struct xfrm_replay_state replay;
188 struct xfrm_replay_state_esn *replay_esn;
189
190 /* Replay detection state at the time we sent the last notification */
191 struct xfrm_replay_state preplay;
192 struct xfrm_replay_state_esn *preplay_esn;
193
194 /* The functions for replay detection. */
195 struct xfrm_replay *repl;
196
197 /* internal flag that only holds state for delayed aevent at the
198 * moment
199 */
200 u32 xflags;
201
202 /* Replay detection notification settings */
203 u32 replay_maxage;
204 u32 replay_maxdiff;
205
206 /* Replay detection notification timer */
207 struct timer_list rtimer;
208
209 /* Statistics */
210 struct xfrm_stats stats;
211
212 struct xfrm_lifetime_cur curlft;
213 struct tasklet_hrtimer mtimer;
214
215 /* used to fix curlft->add_time when changing date */
216 long saved_tmo;
217
218 /* Last used time */
219 unsigned long lastused;
220
221 /* Reference to data common to all the instances of this
222 * transformer. */
223 const struct xfrm_type *type;
224 struct xfrm_mode *inner_mode;
225 struct xfrm_mode *inner_mode_iaf;
226 struct xfrm_mode *outer_mode;
227
228 /* Security context */
229 struct xfrm_sec_ctx *security;
230
231 /* Private data of this transformer, format is opaque,
232 * interpreted by xfrm_type methods. */
233 void *data;
234 };
235
236 static inline struct net *xs_net(struct xfrm_state *x)
237 {
238 return read_pnet(&x->xs_net);
239 }
240
241 /* xflags - make enum if more show up */
242 #define XFRM_TIME_DEFER 1
243 #define XFRM_SOFT_EXPIRE 2
244
245 enum {
246 XFRM_STATE_VOID,
247 XFRM_STATE_ACQ,
248 XFRM_STATE_VALID,
249 XFRM_STATE_ERROR,
250 XFRM_STATE_EXPIRED,
251 XFRM_STATE_DEAD
252 };
253
254 /* callback structure passed from either netlink or pfkey */
255 struct km_event {
256 union {
257 u32 hard;
258 u32 proto;
259 u32 byid;
260 u32 aevent;
261 u32 type;
262 } data;
263
264 u32 seq;
265 u32 portid;
266 u32 event;
267 struct net *net;
268 };
269
270 struct xfrm_replay {
271 void (*advance)(struct xfrm_state *x, __be32 net_seq);
272 int (*check)(struct xfrm_state *x,
273 struct sk_buff *skb,
274 __be32 net_seq);
275 int (*recheck)(struct xfrm_state *x,
276 struct sk_buff *skb,
277 __be32 net_seq);
278 void (*notify)(struct xfrm_state *x, int event);
279 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
280 };
281
282 struct net_device;
283 struct xfrm_type;
284 struct xfrm_dst;
285 struct xfrm_policy_afinfo {
286 unsigned short family;
287 struct dst_ops *dst_ops;
288 void (*garbage_collect)(struct net *net);
289 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
290 const xfrm_address_t *saddr,
291 const xfrm_address_t *daddr);
292 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
293 void (*decode_session)(struct sk_buff *skb,
294 struct flowi *fl,
295 int reverse);
296 int (*get_tos)(const struct flowi *fl);
297 void (*init_dst)(struct net *net,
298 struct xfrm_dst *dst);
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 sk_buff *skb);
337 int (*output_finish)(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 #ifdef CONFIG_NET_NS
526 struct net *xp_net;
527 #endif
528 struct hlist_node bydst;
529 struct hlist_node byidx;
530
531 /* This lock only affects elements except for entry. */
532 rwlock_t lock;
533 atomic_t refcnt;
534 struct timer_list timer;
535
536 struct flow_cache_object flo;
537 atomic_t genid;
538 u32 priority;
539 u32 index;
540 struct xfrm_mark mark;
541 struct xfrm_selector selector;
542 struct xfrm_lifetime_cfg lft;
543 struct xfrm_lifetime_cur curlft;
544 struct xfrm_policy_walk_entry walk;
545 struct xfrm_policy_queue polq;
546 u8 type;
547 u8 action;
548 u8 flags;
549 u8 xfrm_nr;
550 u16 family;
551 struct xfrm_sec_ctx *security;
552 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
553 };
554
555 static inline struct net *xp_net(const struct xfrm_policy *xp)
556 {
557 return read_pnet(&xp->xp_net);
558 }
559
560 struct xfrm_kmaddress {
561 xfrm_address_t local;
562 xfrm_address_t remote;
563 u32 reserved;
564 u16 family;
565 };
566
567 struct xfrm_migrate {
568 xfrm_address_t old_daddr;
569 xfrm_address_t old_saddr;
570 xfrm_address_t new_daddr;
571 xfrm_address_t new_saddr;
572 u8 proto;
573 u8 mode;
574 u16 reserved;
575 u32 reqid;
576 u16 old_family;
577 u16 new_family;
578 };
579
580 #define XFRM_KM_TIMEOUT 30
581 /* what happened */
582 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
583 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
584
585 /* default aevent timeout in units of 100ms */
586 #define XFRM_AE_ETIME 10
587 /* Async Event timer multiplier */
588 #define XFRM_AE_ETH_M 10
589 /* default seq threshold size */
590 #define XFRM_AE_SEQT_SIZE 2
591
592 struct xfrm_mgr {
593 struct list_head list;
594 char *id;
595 int (*notify)(struct xfrm_state *x, const struct km_event *c);
596 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
597 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
598 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
599 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
600 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
601 int (*migrate)(const struct xfrm_selector *sel,
602 u8 dir, u8 type,
603 const struct xfrm_migrate *m,
604 int num_bundles,
605 const struct xfrm_kmaddress *k);
606 bool (*is_alive)(const struct km_event *c);
607 };
608
609 int xfrm_register_km(struct xfrm_mgr *km);
610 int xfrm_unregister_km(struct xfrm_mgr *km);
611
612 struct xfrm_tunnel_skb_cb {
613 union {
614 struct inet_skb_parm h4;
615 struct inet6_skb_parm h6;
616 } header;
617
618 union {
619 struct ip_tunnel *ip4;
620 struct ip6_tnl *ip6;
621 } tunnel;
622 };
623
624 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
625
626 /*
627 * This structure is used for the duration where packets are being
628 * transformed by IPsec. As soon as the packet leaves IPsec the
629 * area beyond the generic IP part may be overwritten.
630 */
631 struct xfrm_skb_cb {
632 struct xfrm_tunnel_skb_cb header;
633
634 /* Sequence number for replay protection. */
635 union {
636 struct {
637 __u32 low;
638 __u32 hi;
639 } output;
640 struct {
641 __be32 low;
642 __be32 hi;
643 } input;
644 } seq;
645 };
646
647 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
648
649 /*
650 * This structure is used by the afinfo prepare_input/prepare_output functions
651 * to transmit header information to the mode input/output functions.
652 */
653 struct xfrm_mode_skb_cb {
654 struct xfrm_tunnel_skb_cb header;
655
656 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
657 __be16 id;
658 __be16 frag_off;
659
660 /* IP header length (excluding options or extension headers). */
661 u8 ihl;
662
663 /* TOS for IPv4, class for IPv6. */
664 u8 tos;
665
666 /* TTL for IPv4, hop limitfor IPv6. */
667 u8 ttl;
668
669 /* Protocol for IPv4, NH for IPv6. */
670 u8 protocol;
671
672 /* Option length for IPv4, zero for IPv6. */
673 u8 optlen;
674
675 /* Used by IPv6 only, zero for IPv4. */
676 u8 flow_lbl[3];
677 };
678
679 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
680
681 /*
682 * This structure is used by the input processing to locate the SPI and
683 * related information.
684 */
685 struct xfrm_spi_skb_cb {
686 struct xfrm_tunnel_skb_cb header;
687
688 unsigned int daddroff;
689 unsigned int family;
690 };
691
692 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
693
694 /* Audit Information */
695 struct xfrm_audit {
696 u32 secid;
697 kuid_t loginuid;
698 unsigned int sessionid;
699 };
700
701 #ifdef CONFIG_AUDITSYSCALL
702 static inline struct audit_buffer *xfrm_audit_start(const char *op)
703 {
704 struct audit_buffer *audit_buf = NULL;
705
706 if (audit_enabled == 0)
707 return NULL;
708 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
709 AUDIT_MAC_IPSEC_EVENT);
710 if (audit_buf == NULL)
711 return NULL;
712 audit_log_format(audit_buf, "op=%s", op);
713 return audit_buf;
714 }
715
716 static inline void xfrm_audit_helper_usrinfo(kuid_t auid, unsigned int ses, u32 secid,
717 struct audit_buffer *audit_buf)
718 {
719 char *secctx;
720 u32 secctx_len;
721
722 audit_log_format(audit_buf, " auid=%u ses=%u",
723 from_kuid(&init_user_ns, auid), ses);
724 if (secid != 0 &&
725 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
726 audit_log_format(audit_buf, " subj=%s", secctx);
727 security_release_secctx(secctx, secctx_len);
728 } else
729 audit_log_task_context(audit_buf);
730 }
731
732 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, kuid_t auid,
733 unsigned int ses, u32 secid);
734 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, kuid_t auid,
735 unsigned int ses, u32 secid);
736 void xfrm_audit_state_add(struct xfrm_state *x, int result, kuid_t auid,
737 unsigned int ses, u32 secid);
738 void xfrm_audit_state_delete(struct xfrm_state *x, int result, kuid_t auid,
739 unsigned int ses, u32 secid);
740 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
741 struct sk_buff *skb);
742 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
743 __be32 net_seq);
744 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
745 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
746 __be32 net_seq);
747 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
748 u8 proto);
749 #else
750
751 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
752 kuid_t auid, unsigned int ses, u32 secid)
753 {
754 }
755
756 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
757 kuid_t auid, unsigned int ses, u32 secid)
758 {
759 }
760
761 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
762 kuid_t auid, unsigned int ses, u32 secid)
763 {
764 }
765
766 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
767 kuid_t auid, unsigned int ses, u32 secid)
768 {
769 }
770
771 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
772 struct sk_buff *skb)
773 {
774 }
775
776 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
777 struct sk_buff *skb, __be32 net_seq)
778 {
779 }
780
781 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
782 u16 family)
783 {
784 }
785
786 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
787 __be32 net_spi, __be32 net_seq)
788 {
789 }
790
791 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
792 struct sk_buff *skb, u8 proto)
793 {
794 }
795 #endif /* CONFIG_AUDITSYSCALL */
796
797 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
798 {
799 if (likely(policy != NULL))
800 atomic_inc(&policy->refcnt);
801 }
802
803 void xfrm_policy_destroy(struct xfrm_policy *policy);
804
805 static inline void xfrm_pol_put(struct xfrm_policy *policy)
806 {
807 if (atomic_dec_and_test(&policy->refcnt))
808 xfrm_policy_destroy(policy);
809 }
810
811 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
812 {
813 int i;
814 for (i = npols - 1; i >= 0; --i)
815 xfrm_pol_put(pols[i]);
816 }
817
818 void __xfrm_state_destroy(struct xfrm_state *);
819
820 static inline void __xfrm_state_put(struct xfrm_state *x)
821 {
822 atomic_dec(&x->refcnt);
823 }
824
825 static inline void xfrm_state_put(struct xfrm_state *x)
826 {
827 if (atomic_dec_and_test(&x->refcnt))
828 __xfrm_state_destroy(x);
829 }
830
831 static inline void xfrm_state_hold(struct xfrm_state *x)
832 {
833 atomic_inc(&x->refcnt);
834 }
835
836 static inline bool addr_match(const void *token1, const void *token2,
837 int prefixlen)
838 {
839 const __be32 *a1 = token1;
840 const __be32 *a2 = token2;
841 int pdw;
842 int pbi;
843
844 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
845 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
846
847 if (pdw)
848 if (memcmp(a1, a2, pdw << 2))
849 return false;
850
851 if (pbi) {
852 __be32 mask;
853
854 mask = htonl((0xffffffff) << (32 - pbi));
855
856 if ((a1[pdw] ^ a2[pdw]) & mask)
857 return false;
858 }
859
860 return true;
861 }
862
863 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
864 {
865 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
866 if (prefixlen == 0)
867 return true;
868 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
869 }
870
871 static __inline__
872 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
873 {
874 __be16 port;
875 switch(fl->flowi_proto) {
876 case IPPROTO_TCP:
877 case IPPROTO_UDP:
878 case IPPROTO_UDPLITE:
879 case IPPROTO_SCTP:
880 port = uli->ports.sport;
881 break;
882 case IPPROTO_ICMP:
883 case IPPROTO_ICMPV6:
884 port = htons(uli->icmpt.type);
885 break;
886 case IPPROTO_MH:
887 port = htons(uli->mht.type);
888 break;
889 case IPPROTO_GRE:
890 port = htons(ntohl(uli->gre_key) >> 16);
891 break;
892 default:
893 port = 0; /*XXX*/
894 }
895 return port;
896 }
897
898 static __inline__
899 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
900 {
901 __be16 port;
902 switch(fl->flowi_proto) {
903 case IPPROTO_TCP:
904 case IPPROTO_UDP:
905 case IPPROTO_UDPLITE:
906 case IPPROTO_SCTP:
907 port = uli->ports.dport;
908 break;
909 case IPPROTO_ICMP:
910 case IPPROTO_ICMPV6:
911 port = htons(uli->icmpt.code);
912 break;
913 case IPPROTO_GRE:
914 port = htons(ntohl(uli->gre_key) & 0xffff);
915 break;
916 default:
917 port = 0; /*XXX*/
918 }
919 return port;
920 }
921
922 bool xfrm_selector_match(const struct xfrm_selector *sel,
923 const struct flowi *fl, unsigned short family);
924
925 #ifdef CONFIG_SECURITY_NETWORK_XFRM
926 /* If neither has a context --> match
927 * Otherwise, both must have a context and the sids, doi, alg must match
928 */
929 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
930 {
931 return ((!s1 && !s2) ||
932 (s1 && s2 &&
933 (s1->ctx_sid == s2->ctx_sid) &&
934 (s1->ctx_doi == s2->ctx_doi) &&
935 (s1->ctx_alg == s2->ctx_alg)));
936 }
937 #else
938 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
939 {
940 return true;
941 }
942 #endif
943
944 /* A struct encoding bundle of transformations to apply to some set of flow.
945 *
946 * dst->child points to the next element of bundle.
947 * dst->xfrm points to an instanse of transformer.
948 *
949 * Due to unfortunate limitations of current routing cache, which we
950 * have no time to fix, it mirrors struct rtable and bound to the same
951 * routing key, including saddr,daddr. However, we can have many of
952 * bundles differing by session id. All the bundles grow from a parent
953 * policy rule.
954 */
955 struct xfrm_dst {
956 union {
957 struct dst_entry dst;
958 struct rtable rt;
959 struct rt6_info rt6;
960 } u;
961 struct dst_entry *route;
962 struct flow_cache_object flo;
963 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
964 int num_pols, num_xfrms;
965 #ifdef CONFIG_XFRM_SUB_POLICY
966 struct flowi *origin;
967 struct xfrm_selector *partner;
968 #endif
969 u32 xfrm_genid;
970 u32 policy_genid;
971 u32 route_mtu_cached;
972 u32 child_mtu_cached;
973 u32 route_cookie;
974 u32 path_cookie;
975 };
976
977 #ifdef CONFIG_XFRM
978 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
979 {
980 xfrm_pols_put(xdst->pols, xdst->num_pols);
981 dst_release(xdst->route);
982 if (likely(xdst->u.dst.xfrm))
983 xfrm_state_put(xdst->u.dst.xfrm);
984 #ifdef CONFIG_XFRM_SUB_POLICY
985 kfree(xdst->origin);
986 xdst->origin = NULL;
987 kfree(xdst->partner);
988 xdst->partner = NULL;
989 #endif
990 }
991 #endif
992
993 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
994
995 struct sec_path {
996 atomic_t refcnt;
997 int len;
998 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
999 };
1000
1001 static inline int secpath_exists(struct sk_buff *skb)
1002 {
1003 #ifdef CONFIG_XFRM
1004 return skb->sp != NULL;
1005 #else
1006 return 0;
1007 #endif
1008 }
1009
1010 static inline struct sec_path *
1011 secpath_get(struct sec_path *sp)
1012 {
1013 if (sp)
1014 atomic_inc(&sp->refcnt);
1015 return sp;
1016 }
1017
1018 void __secpath_destroy(struct sec_path *sp);
1019
1020 static inline void
1021 secpath_put(struct sec_path *sp)
1022 {
1023 if (sp && atomic_dec_and_test(&sp->refcnt))
1024 __secpath_destroy(sp);
1025 }
1026
1027 struct sec_path *secpath_dup(struct sec_path *src);
1028
1029 static inline void
1030 secpath_reset(struct sk_buff *skb)
1031 {
1032 #ifdef CONFIG_XFRM
1033 secpath_put(skb->sp);
1034 skb->sp = NULL;
1035 #endif
1036 }
1037
1038 static inline int
1039 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1040 {
1041 switch (family) {
1042 case AF_INET:
1043 return addr->a4 == 0;
1044 case AF_INET6:
1045 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1046 }
1047 return 0;
1048 }
1049
1050 static inline int
1051 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1052 {
1053 return (tmpl->saddr.a4 &&
1054 tmpl->saddr.a4 != x->props.saddr.a4);
1055 }
1056
1057 static inline int
1058 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1059 {
1060 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1061 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1062 }
1063
1064 static inline int
1065 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1066 {
1067 switch (family) {
1068 case AF_INET:
1069 return __xfrm4_state_addr_cmp(tmpl, x);
1070 case AF_INET6:
1071 return __xfrm6_state_addr_cmp(tmpl, x);
1072 }
1073 return !0;
1074 }
1075
1076 #ifdef CONFIG_XFRM
1077 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1078 unsigned short family);
1079
1080 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1081 struct sk_buff *skb,
1082 unsigned int family, int reverse)
1083 {
1084 struct net *net = dev_net(skb->dev);
1085 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1086
1087 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1088 return __xfrm_policy_check(sk, ndir, skb, family);
1089
1090 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1091 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1092 __xfrm_policy_check(sk, ndir, skb, family);
1093 }
1094
1095 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1096 {
1097 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1098 }
1099
1100 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1101 {
1102 return xfrm_policy_check(sk, dir, skb, AF_INET);
1103 }
1104
1105 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1106 {
1107 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1108 }
1109
1110 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1111 struct sk_buff *skb)
1112 {
1113 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1114 }
1115
1116 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1117 struct sk_buff *skb)
1118 {
1119 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1120 }
1121
1122 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1123 unsigned int family, int reverse);
1124
1125 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1126 unsigned int family)
1127 {
1128 return __xfrm_decode_session(skb, fl, family, 0);
1129 }
1130
1131 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1132 struct flowi *fl,
1133 unsigned int family)
1134 {
1135 return __xfrm_decode_session(skb, fl, family, 1);
1136 }
1137
1138 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1139
1140 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1141 {
1142 struct net *net = dev_net(skb->dev);
1143
1144 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1145 (skb_dst(skb)->flags & DST_NOXFRM) ||
1146 __xfrm_route_forward(skb, family);
1147 }
1148
1149 static inline int xfrm4_route_forward(struct sk_buff *skb)
1150 {
1151 return xfrm_route_forward(skb, AF_INET);
1152 }
1153
1154 static inline int xfrm6_route_forward(struct sk_buff *skb)
1155 {
1156 return xfrm_route_forward(skb, AF_INET6);
1157 }
1158
1159 int __xfrm_sk_clone_policy(struct sock *sk);
1160
1161 static inline int xfrm_sk_clone_policy(struct sock *sk)
1162 {
1163 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1164 return __xfrm_sk_clone_policy(sk);
1165 return 0;
1166 }
1167
1168 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1169
1170 static inline void xfrm_sk_free_policy(struct sock *sk)
1171 {
1172 if (unlikely(sk->sk_policy[0] != NULL)) {
1173 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1174 sk->sk_policy[0] = NULL;
1175 }
1176 if (unlikely(sk->sk_policy[1] != NULL)) {
1177 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1178 sk->sk_policy[1] = NULL;
1179 }
1180 }
1181
1182 void xfrm_garbage_collect(struct net *net);
1183
1184 #else
1185
1186 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1187 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1188 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1189 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1190 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1191 {
1192 return 1;
1193 }
1194 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1195 {
1196 return 1;
1197 }
1198 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1199 {
1200 return 1;
1201 }
1202 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1203 struct flowi *fl,
1204 unsigned int family)
1205 {
1206 return -ENOSYS;
1207 }
1208 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1209 struct sk_buff *skb)
1210 {
1211 return 1;
1212 }
1213 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1214 struct sk_buff *skb)
1215 {
1216 return 1;
1217 }
1218 static inline void xfrm_garbage_collect(struct net *net)
1219 {
1220 }
1221 #endif
1222
1223 static __inline__
1224 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1225 {
1226 switch (family){
1227 case AF_INET:
1228 return (xfrm_address_t *)&fl->u.ip4.daddr;
1229 case AF_INET6:
1230 return (xfrm_address_t *)&fl->u.ip6.daddr;
1231 }
1232 return NULL;
1233 }
1234
1235 static __inline__
1236 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1237 {
1238 switch (family){
1239 case AF_INET:
1240 return (xfrm_address_t *)&fl->u.ip4.saddr;
1241 case AF_INET6:
1242 return (xfrm_address_t *)&fl->u.ip6.saddr;
1243 }
1244 return NULL;
1245 }
1246
1247 static __inline__
1248 void xfrm_flowi_addr_get(const struct flowi *fl,
1249 xfrm_address_t *saddr, xfrm_address_t *daddr,
1250 unsigned short family)
1251 {
1252 switch(family) {
1253 case AF_INET:
1254 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1255 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1256 break;
1257 case AF_INET6:
1258 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1259 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1260 break;
1261 }
1262 }
1263
1264 static __inline__ int
1265 __xfrm4_state_addr_check(const struct xfrm_state *x,
1266 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1267 {
1268 if (daddr->a4 == x->id.daddr.a4 &&
1269 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1270 return 1;
1271 return 0;
1272 }
1273
1274 static __inline__ int
1275 __xfrm6_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277 {
1278 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1279 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1280 ipv6_addr_any((struct in6_addr *)saddr) ||
1281 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1282 return 1;
1283 return 0;
1284 }
1285
1286 static __inline__ int
1287 xfrm_state_addr_check(const struct xfrm_state *x,
1288 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1289 unsigned short family)
1290 {
1291 switch (family) {
1292 case AF_INET:
1293 return __xfrm4_state_addr_check(x, daddr, saddr);
1294 case AF_INET6:
1295 return __xfrm6_state_addr_check(x, daddr, saddr);
1296 }
1297 return 0;
1298 }
1299
1300 static __inline__ int
1301 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1302 unsigned short family)
1303 {
1304 switch (family) {
1305 case AF_INET:
1306 return __xfrm4_state_addr_check(x,
1307 (const xfrm_address_t *)&fl->u.ip4.daddr,
1308 (const xfrm_address_t *)&fl->u.ip4.saddr);
1309 case AF_INET6:
1310 return __xfrm6_state_addr_check(x,
1311 (const xfrm_address_t *)&fl->u.ip6.daddr,
1312 (const xfrm_address_t *)&fl->u.ip6.saddr);
1313 }
1314 return 0;
1315 }
1316
1317 static inline int xfrm_state_kern(const struct xfrm_state *x)
1318 {
1319 return atomic_read(&x->tunnel_users);
1320 }
1321
1322 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1323 {
1324 return (!userproto || proto == userproto ||
1325 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1326 proto == IPPROTO_ESP ||
1327 proto == IPPROTO_COMP)));
1328 }
1329
1330 /*
1331 * xfrm algorithm information
1332 */
1333 struct xfrm_algo_aead_info {
1334 u16 icv_truncbits;
1335 };
1336
1337 struct xfrm_algo_auth_info {
1338 u16 icv_truncbits;
1339 u16 icv_fullbits;
1340 };
1341
1342 struct xfrm_algo_encr_info {
1343 u16 blockbits;
1344 u16 defkeybits;
1345 };
1346
1347 struct xfrm_algo_comp_info {
1348 u16 threshold;
1349 };
1350
1351 struct xfrm_algo_desc {
1352 char *name;
1353 char *compat;
1354 u8 available:1;
1355 u8 pfkey_supported:1;
1356 union {
1357 struct xfrm_algo_aead_info aead;
1358 struct xfrm_algo_auth_info auth;
1359 struct xfrm_algo_encr_info encr;
1360 struct xfrm_algo_comp_info comp;
1361 } uinfo;
1362 struct sadb_alg desc;
1363 };
1364
1365 /* XFRM protocol handlers. */
1366 struct xfrm4_protocol {
1367 int (*handler)(struct sk_buff *skb);
1368 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1369 int encap_type);
1370 int (*cb_handler)(struct sk_buff *skb, int err);
1371 int (*err_handler)(struct sk_buff *skb, u32 info);
1372
1373 struct xfrm4_protocol __rcu *next;
1374 int priority;
1375 };
1376
1377 struct xfrm6_protocol {
1378 int (*handler)(struct sk_buff *skb);
1379 int (*cb_handler)(struct sk_buff *skb, int err);
1380 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1381 u8 type, u8 code, int offset, __be32 info);
1382
1383 struct xfrm6_protocol __rcu *next;
1384 int priority;
1385 };
1386
1387 /* XFRM tunnel handlers. */
1388 struct xfrm_tunnel {
1389 int (*handler)(struct sk_buff *skb);
1390 int (*err_handler)(struct sk_buff *skb, u32 info);
1391
1392 struct xfrm_tunnel __rcu *next;
1393 int priority;
1394 };
1395
1396 struct xfrm6_tunnel {
1397 int (*handler)(struct sk_buff *skb);
1398 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1399 u8 type, u8 code, int offset, __be32 info);
1400 struct xfrm6_tunnel __rcu *next;
1401 int priority;
1402 };
1403
1404 void xfrm_init(void);
1405 void xfrm4_init(void);
1406 int xfrm_state_init(struct net *net);
1407 void xfrm_state_fini(struct net *net);
1408 void xfrm4_state_init(void);
1409 void xfrm4_protocol_init(void);
1410 #ifdef CONFIG_XFRM
1411 int xfrm6_init(void);
1412 void xfrm6_fini(void);
1413 int xfrm6_state_init(void);
1414 void xfrm6_state_fini(void);
1415 int xfrm6_protocol_init(void);
1416 void xfrm6_protocol_fini(void);
1417 #else
1418 static inline int xfrm6_init(void)
1419 {
1420 return 0;
1421 }
1422 static inline void xfrm6_fini(void)
1423 {
1424 ;
1425 }
1426 #endif
1427
1428 #ifdef CONFIG_XFRM_STATISTICS
1429 int xfrm_proc_init(struct net *net);
1430 void xfrm_proc_fini(struct net *net);
1431 #endif
1432
1433 int xfrm_sysctl_init(struct net *net);
1434 #ifdef CONFIG_SYSCTL
1435 void xfrm_sysctl_fini(struct net *net);
1436 #else
1437 static inline void xfrm_sysctl_fini(struct net *net)
1438 {
1439 }
1440 #endif
1441
1442 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1443 struct xfrm_address_filter *filter);
1444 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1445 int (*func)(struct xfrm_state *, int, void*), void *);
1446 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1447 struct xfrm_state *xfrm_state_alloc(struct net *net);
1448 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1449 const xfrm_address_t *saddr,
1450 const struct flowi *fl,
1451 struct xfrm_tmpl *tmpl,
1452 struct xfrm_policy *pol, int *err,
1453 unsigned short family);
1454 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1455 xfrm_address_t *daddr,
1456 xfrm_address_t *saddr,
1457 unsigned short family,
1458 u8 mode, u8 proto, u32 reqid);
1459 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1460 unsigned short family);
1461 int xfrm_state_check_expire(struct xfrm_state *x);
1462 void xfrm_state_insert(struct xfrm_state *x);
1463 int xfrm_state_add(struct xfrm_state *x);
1464 int xfrm_state_update(struct xfrm_state *x);
1465 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1466 const xfrm_address_t *daddr, __be32 spi,
1467 u8 proto, unsigned short family);
1468 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1469 const xfrm_address_t *daddr,
1470 const xfrm_address_t *saddr,
1471 u8 proto,
1472 unsigned short family);
1473 #ifdef CONFIG_XFRM_SUB_POLICY
1474 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1475 unsigned short family, struct net *net);
1476 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1477 unsigned short family);
1478 #else
1479 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1480 int n, unsigned short family, struct net *net)
1481 {
1482 return -ENOSYS;
1483 }
1484
1485 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1486 int n, unsigned short family)
1487 {
1488 return -ENOSYS;
1489 }
1490 #endif
1491
1492 struct xfrmk_sadinfo {
1493 u32 sadhcnt; /* current hash bkts */
1494 u32 sadhmcnt; /* max allowed hash bkts */
1495 u32 sadcnt; /* current running count */
1496 };
1497
1498 struct xfrmk_spdinfo {
1499 u32 incnt;
1500 u32 outcnt;
1501 u32 fwdcnt;
1502 u32 inscnt;
1503 u32 outscnt;
1504 u32 fwdscnt;
1505 u32 spdhcnt;
1506 u32 spdhmcnt;
1507 };
1508
1509 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1510 int xfrm_state_delete(struct xfrm_state *x);
1511 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1512 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1513 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1514 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1515 int xfrm_init_replay(struct xfrm_state *x);
1516 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1517 int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1518 int xfrm_init_state(struct xfrm_state *x);
1519 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1520 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1521 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1522 int xfrm_output_resume(struct sk_buff *skb, int err);
1523 int xfrm_output(struct sk_buff *skb);
1524 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1525 void xfrm_local_error(struct sk_buff *skb, int mtu);
1526 int xfrm4_extract_header(struct sk_buff *skb);
1527 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1528 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1529 int encap_type);
1530 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1531 int xfrm4_rcv(struct sk_buff *skb);
1532
1533 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1534 {
1535 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1536 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1537 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1538 return xfrm_input(skb, nexthdr, spi, 0);
1539 }
1540
1541 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1542 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1543 int xfrm4_output(struct sk_buff *skb);
1544 int xfrm4_output_finish(struct sk_buff *skb);
1545 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1546 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1547 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1548 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1549 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1550 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1551 int xfrm6_extract_header(struct sk_buff *skb);
1552 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1553 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1554 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1555 int xfrm6_rcv(struct sk_buff *skb);
1556 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1557 xfrm_address_t *saddr, u8 proto);
1558 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1559 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1560 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1561 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1562 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1563 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1564 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1565 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1566 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1567 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1568 int xfrm6_output(struct sk_buff *skb);
1569 int xfrm6_output_finish(struct sk_buff *skb);
1570 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1571 u8 **prevhdr);
1572
1573 #ifdef CONFIG_XFRM
1574 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1575 int xfrm_user_policy(struct sock *sk, int optname,
1576 u8 __user *optval, int optlen);
1577 #else
1578 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1579 {
1580 return -ENOPROTOOPT;
1581 }
1582
1583 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1584 {
1585 /* should not happen */
1586 kfree_skb(skb);
1587 return 0;
1588 }
1589 #endif
1590
1591 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1592
1593 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1594 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1595 int (*func)(struct xfrm_policy *, int, int, void*),
1596 void *);
1597 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1598 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1599 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1600 u8 type, int dir,
1601 struct xfrm_selector *sel,
1602 struct xfrm_sec_ctx *ctx, int delete,
1603 int *err);
1604 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1605 u32 id, int delete, int *err);
1606 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1607 u32 xfrm_get_acqseq(void);
1608 int verify_spi_info(u8 proto, u32 min, u32 max);
1609 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1610 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1611 u8 mode, u32 reqid, u8 proto,
1612 const xfrm_address_t *daddr,
1613 const xfrm_address_t *saddr, int create,
1614 unsigned short family);
1615 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1616
1617 #ifdef CONFIG_XFRM_MIGRATE
1618 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1619 const struct xfrm_migrate *m, int num_bundles,
1620 const struct xfrm_kmaddress *k);
1621 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1622 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1623 struct xfrm_migrate *m);
1624 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1625 struct xfrm_migrate *m, int num_bundles,
1626 struct xfrm_kmaddress *k, struct net *net);
1627 #endif
1628
1629 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1630 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1631 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1632 xfrm_address_t *addr);
1633
1634 void xfrm_input_init(void);
1635 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1636
1637 void xfrm_probe_algs(void);
1638 int xfrm_count_pfkey_auth_supported(void);
1639 int xfrm_count_pfkey_enc_supported(void);
1640 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1641 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1642 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1643 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1644 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1645 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1646 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1647 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1648 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1649 int probe);
1650
1651 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1652 const xfrm_address_t *b)
1653 {
1654 return ipv6_addr_equal((const struct in6_addr *)a,
1655 (const struct in6_addr *)b);
1656 }
1657
1658 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1659 const xfrm_address_t *b,
1660 sa_family_t family)
1661 {
1662 switch (family) {
1663 default:
1664 case AF_INET:
1665 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1666 case AF_INET6:
1667 return xfrm6_addr_equal(a, b);
1668 }
1669 }
1670
1671 static inline int xfrm_policy_id2dir(u32 index)
1672 {
1673 return index & 7;
1674 }
1675
1676 #ifdef CONFIG_XFRM
1677 static inline int xfrm_aevent_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_AEVENTS);
1686 rcu_read_unlock();
1687 return ret;
1688 }
1689
1690 static inline int xfrm_acquire_is_on(struct net *net)
1691 {
1692 struct sock *nlsk;
1693 int ret = 0;
1694
1695 rcu_read_lock();
1696 nlsk = rcu_dereference(net->xfrm.nlsk);
1697 if (nlsk)
1698 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1699 rcu_read_unlock();
1700
1701 return ret;
1702 }
1703 #endif
1704
1705 static inline int aead_len(struct xfrm_algo_aead *alg)
1706 {
1707 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1708 }
1709
1710 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1711 {
1712 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1713 }
1714
1715 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1716 {
1717 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1718 }
1719
1720 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1721 {
1722 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1723 }
1724
1725 #ifdef CONFIG_XFRM_MIGRATE
1726 static inline int xfrm_replay_clone(struct xfrm_state *x,
1727 struct xfrm_state *orig)
1728 {
1729 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1730 GFP_KERNEL);
1731 if (!x->replay_esn)
1732 return -ENOMEM;
1733
1734 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1735 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1736
1737 x->preplay_esn = kmemdup(x->replay_esn,
1738 xfrm_replay_state_esn_len(x->replay_esn),
1739 GFP_KERNEL);
1740 if (!x->preplay_esn) {
1741 kfree(x->replay_esn);
1742 return -ENOMEM;
1743 }
1744
1745 return 0;
1746 }
1747
1748 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1749 {
1750 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1751 }
1752
1753
1754 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1755 {
1756 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1757 }
1758
1759 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1760 {
1761 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1762 }
1763
1764 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1765 {
1766 int i;
1767 for (i = 0; i < n; i++)
1768 xfrm_state_put(*(states + i));
1769 }
1770
1771 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1772 {
1773 int i;
1774 for (i = 0; i < n; i++)
1775 xfrm_state_delete(*(states + i));
1776 }
1777 #endif
1778
1779 #ifdef CONFIG_XFRM
1780 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1781 {
1782 return skb->sp->xvec[skb->sp->len - 1];
1783 }
1784 #endif
1785
1786 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1787 {
1788 if (attrs[XFRMA_MARK])
1789 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1790 else
1791 m->v = m->m = 0;
1792
1793 return m->v & m->m;
1794 }
1795
1796 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1797 {
1798 int ret = 0;
1799
1800 if (m->m | m->v)
1801 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1802 return ret;
1803 }
1804
1805 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1806 unsigned int family)
1807 {
1808 bool tunnel = false;
1809
1810 switch(family) {
1811 case AF_INET:
1812 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1813 tunnel = true;
1814 break;
1815 case AF_INET6:
1816 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1817 tunnel = true;
1818 break;
1819 }
1820 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1821 return -EINVAL;
1822
1823 return 0;
1824 }
1825 #endif /* _NET_XFRM_H */
Linux with added FPC-III support