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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[deliverable/linux.git] / include / net / xfrm.h
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 extern struct mutex xfrm_cfg_mutex;
57
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119 struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 union {
123 u8 dying;
124 u8 proto;
125 };
126 u32 seq;
127 };
128
129 /* Full description of state of transformer. */
130 struct xfrm_state {
131 #ifdef CONFIG_NET_NS
132 struct net *xs_net;
133 #endif
134 union {
135 struct hlist_node gclist;
136 struct hlist_node bydst;
137 };
138 struct hlist_node bysrc;
139 struct hlist_node byspi;
140
141 atomic_t refcnt;
142 spinlock_t lock;
143
144 struct xfrm_id id;
145 struct xfrm_selector sel;
146 struct xfrm_mark mark;
147 u32 tfcpad;
148
149 u32 genid;
150
151 /* Key manager bits */
152 struct xfrm_state_walk km;
153
154 /* Parameters of this state. */
155 struct {
156 u32 reqid;
157 u8 mode;
158 u8 replay_window;
159 u8 aalgo, ealgo, calgo;
160 u8 flags;
161 u16 family;
162 xfrm_address_t saddr;
163 int header_len;
164 int trailer_len;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo_auth *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189 struct xfrm_replay_state_esn *replay_esn;
190
191 /* Replay detection state at the time we sent the last notification */
192 struct xfrm_replay_state preplay;
193 struct xfrm_replay_state_esn *preplay_esn;
194
195 /* The functions for replay detection. */
196 struct xfrm_replay *repl;
197
198 /* internal flag that only holds state for delayed aevent at the
199 * moment
200 */
201 u32 xflags;
202
203 /* Replay detection notification settings */
204 u32 replay_maxage;
205 u32 replay_maxdiff;
206
207 /* Replay detection notification timer */
208 struct timer_list rtimer;
209
210 /* Statistics */
211 struct xfrm_stats stats;
212
213 struct xfrm_lifetime_cur curlft;
214 struct tasklet_hrtimer mtimer;
215
216 /* used to fix curlft->add_time when changing date */
217 long saved_tmo;
218
219 /* Last used time */
220 unsigned long lastused;
221
222 /* Reference to data common to all the instances of this
223 * transformer. */
224 const struct xfrm_type *type;
225 struct xfrm_mode *inner_mode;
226 struct xfrm_mode *inner_mode_iaf;
227 struct xfrm_mode *outer_mode;
228
229 /* Security context */
230 struct xfrm_sec_ctx *security;
231
232 /* Private data of this transformer, format is opaque,
233 * interpreted by xfrm_type methods. */
234 void *data;
235 };
236
237 static inline struct net *xs_net(struct xfrm_state *x)
238 {
239 return read_pnet(&x->xs_net);
240 }
241
242 /* xflags - make enum if more show up */
243 #define XFRM_TIME_DEFER 1
244 #define XFRM_SOFT_EXPIRE 2
245
246 enum {
247 XFRM_STATE_VOID,
248 XFRM_STATE_ACQ,
249 XFRM_STATE_VALID,
250 XFRM_STATE_ERROR,
251 XFRM_STATE_EXPIRED,
252 XFRM_STATE_DEAD
253 };
254
255 /* callback structure passed from either netlink or pfkey */
256 struct km_event {
257 union {
258 u32 hard;
259 u32 proto;
260 u32 byid;
261 u32 aevent;
262 u32 type;
263 } data;
264
265 u32 seq;
266 u32 pid;
267 u32 event;
268 struct net *net;
269 };
270
271 struct xfrm_replay {
272 void (*advance)(struct xfrm_state *x, __be32 net_seq);
273 int (*check)(struct xfrm_state *x,
274 struct sk_buff *skb,
275 __be32 net_seq);
276 int (*recheck)(struct xfrm_state *x,
277 struct sk_buff *skb,
278 __be32 net_seq);
279 void (*notify)(struct xfrm_state *x, int event);
280 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
281 };
282
283 struct net_device;
284 struct xfrm_type;
285 struct xfrm_dst;
286 struct xfrm_policy_afinfo {
287 unsigned short family;
288 struct dst_ops *dst_ops;
289 void (*garbage_collect)(struct net *net);
290 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
291 const xfrm_address_t *saddr,
292 const xfrm_address_t *daddr);
293 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
294 void (*decode_session)(struct sk_buff *skb,
295 struct flowi *fl,
296 int reverse);
297 int (*get_tos)(const struct flowi *fl);
298 void (*init_dst)(struct net *net,
299 struct xfrm_dst *dst);
300 int (*init_path)(struct xfrm_dst *path,
301 struct dst_entry *dst,
302 int nfheader_len);
303 int (*fill_dst)(struct xfrm_dst *xdst,
304 struct net_device *dev,
305 const struct flowi *fl);
306 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
307 };
308
309 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
310 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
311 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
312 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
313
314 struct xfrm_tmpl;
315 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
316 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
317 extern int __xfrm_state_delete(struct xfrm_state *x);
318
319 struct xfrm_state_afinfo {
320 unsigned int family;
321 unsigned int proto;
322 __be16 eth_proto;
323 struct module *owner;
324 const struct xfrm_type *type_map[IPPROTO_MAX];
325 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
326 int (*init_flags)(struct xfrm_state *x);
327 void (*init_tempsel)(struct xfrm_selector *sel,
328 const struct flowi *fl);
329 void (*init_temprop)(struct xfrm_state *x,
330 const struct xfrm_tmpl *tmpl,
331 const xfrm_address_t *daddr,
332 const xfrm_address_t *saddr);
333 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
334 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
335 int (*output)(struct sk_buff *skb);
336 int (*output_finish)(struct sk_buff *skb);
337 int (*extract_input)(struct xfrm_state *x,
338 struct sk_buff *skb);
339 int (*extract_output)(struct xfrm_state *x,
340 struct sk_buff *skb);
341 int (*transport_finish)(struct sk_buff *skb,
342 int async);
343 };
344
345 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
346 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
347
348 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
349
350 struct xfrm_type {
351 char *description;
352 struct module *owner;
353 u8 proto;
354 u8 flags;
355 #define XFRM_TYPE_NON_FRAGMENT 1
356 #define XFRM_TYPE_REPLAY_PROT 2
357 #define XFRM_TYPE_LOCAL_COADDR 4
358 #define XFRM_TYPE_REMOTE_COADDR 8
359
360 int (*init_state)(struct xfrm_state *x);
361 void (*destructor)(struct xfrm_state *);
362 int (*input)(struct xfrm_state *, struct sk_buff *skb);
363 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
364 int (*reject)(struct xfrm_state *, struct sk_buff *,
365 const struct flowi *);
366 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
367 /* Estimate maximal size of result of transformation of a dgram */
368 u32 (*get_mtu)(struct xfrm_state *, int size);
369 };
370
371 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
372 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
373
374 struct xfrm_mode {
375 /*
376 * Remove encapsulation header.
377 *
378 * The IP header will be moved over the top of the encapsulation
379 * header.
380 *
381 * On entry, the transport header shall point to where the IP header
382 * should be and the network header shall be set to where the IP
383 * header currently is. skb->data shall point to the start of the
384 * payload.
385 */
386 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
387
388 /*
389 * This is the actual input entry point.
390 *
391 * For transport mode and equivalent this would be identical to
392 * input2 (which does not need to be set). While tunnel mode
393 * and equivalent would set this to the tunnel encapsulation function
394 * xfrm4_prepare_input that would in turn call input2.
395 */
396 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
397
398 /*
399 * Add encapsulation header.
400 *
401 * On exit, the transport header will be set to the start of the
402 * encapsulation header to be filled in by x->type->output and
403 * the mac header will be set to the nextheader (protocol for
404 * IPv4) field of the extension header directly preceding the
405 * encapsulation header, or in its absence, that of the top IP
406 * header. The value of the network header will always point
407 * to the top IP header while skb->data will point to the payload.
408 */
409 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
410
411 /*
412 * This is the actual output entry point.
413 *
414 * For transport mode and equivalent this would be identical to
415 * output2 (which does not need to be set). While tunnel mode
416 * and equivalent would set this to a tunnel encapsulation function
417 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
418 * call output2.
419 */
420 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
421
422 struct xfrm_state_afinfo *afinfo;
423 struct module *owner;
424 unsigned int encap;
425 int flags;
426 };
427
428 /* Flags for xfrm_mode. */
429 enum {
430 XFRM_MODE_FLAG_TUNNEL = 1,
431 };
432
433 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
434 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
435
436 static inline int xfrm_af2proto(unsigned int family)
437 {
438 switch(family) {
439 case AF_INET:
440 return IPPROTO_IPIP;
441 case AF_INET6:
442 return IPPROTO_IPV6;
443 default:
444 return 0;
445 }
446 }
447
448 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
449 {
450 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
451 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
452 return x->inner_mode;
453 else
454 return x->inner_mode_iaf;
455 }
456
457 struct xfrm_tmpl {
458 /* id in template is interpreted as:
459 * daddr - destination of tunnel, may be zero for transport mode.
460 * spi - zero to acquire spi. Not zero if spi is static, then
461 * daddr must be fixed too.
462 * proto - AH/ESP/IPCOMP
463 */
464 struct xfrm_id id;
465
466 /* Source address of tunnel. Ignored, if it is not a tunnel. */
467 xfrm_address_t saddr;
468
469 unsigned short encap_family;
470
471 u32 reqid;
472
473 /* Mode: transport, tunnel etc. */
474 u8 mode;
475
476 /* Sharing mode: unique, this session only, this user only etc. */
477 u8 share;
478
479 /* May skip this transfomration if no SA is found */
480 u8 optional;
481
482 /* Skip aalgos/ealgos/calgos checks. */
483 u8 allalgs;
484
485 /* Bit mask of algos allowed for acquisition */
486 u32 aalgos;
487 u32 ealgos;
488 u32 calgos;
489 };
490
491 #define XFRM_MAX_DEPTH 6
492
493 struct xfrm_policy_walk_entry {
494 struct list_head all;
495 u8 dead;
496 };
497
498 struct xfrm_policy_walk {
499 struct xfrm_policy_walk_entry walk;
500 u8 type;
501 u32 seq;
502 };
503
504 struct xfrm_policy {
505 #ifdef CONFIG_NET_NS
506 struct net *xp_net;
507 #endif
508 struct hlist_node bydst;
509 struct hlist_node byidx;
510
511 /* This lock only affects elements except for entry. */
512 rwlock_t lock;
513 atomic_t refcnt;
514 struct timer_list timer;
515
516 struct flow_cache_object flo;
517 atomic_t genid;
518 u32 priority;
519 u32 index;
520 struct xfrm_mark mark;
521 struct xfrm_selector selector;
522 struct xfrm_lifetime_cfg lft;
523 struct xfrm_lifetime_cur curlft;
524 struct xfrm_policy_walk_entry walk;
525 u8 type;
526 u8 action;
527 u8 flags;
528 u8 xfrm_nr;
529 u16 family;
530 struct xfrm_sec_ctx *security;
531 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
532 };
533
534 static inline struct net *xp_net(const struct xfrm_policy *xp)
535 {
536 return read_pnet(&xp->xp_net);
537 }
538
539 struct xfrm_kmaddress {
540 xfrm_address_t local;
541 xfrm_address_t remote;
542 u32 reserved;
543 u16 family;
544 };
545
546 struct xfrm_migrate {
547 xfrm_address_t old_daddr;
548 xfrm_address_t old_saddr;
549 xfrm_address_t new_daddr;
550 xfrm_address_t new_saddr;
551 u8 proto;
552 u8 mode;
553 u16 reserved;
554 u32 reqid;
555 u16 old_family;
556 u16 new_family;
557 };
558
559 #define XFRM_KM_TIMEOUT 30
560 /* which seqno */
561 #define XFRM_REPLAY_SEQ 1
562 #define XFRM_REPLAY_OSEQ 2
563 #define XFRM_REPLAY_SEQ_MASK 3
564 /* what happened */
565 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
566 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
567
568 /* default aevent timeout in units of 100ms */
569 #define XFRM_AE_ETIME 10
570 /* Async Event timer multiplier */
571 #define XFRM_AE_ETH_M 10
572 /* default seq threshold size */
573 #define XFRM_AE_SEQT_SIZE 2
574
575 struct xfrm_mgr {
576 struct list_head list;
577 char *id;
578 int (*notify)(struct xfrm_state *x, const struct km_event *c);
579 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
580 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
581 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
582 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
583 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
584 int (*migrate)(const struct xfrm_selector *sel,
585 u8 dir, u8 type,
586 const struct xfrm_migrate *m,
587 int num_bundles,
588 const struct xfrm_kmaddress *k);
589 };
590
591 extern int xfrm_register_km(struct xfrm_mgr *km);
592 extern int xfrm_unregister_km(struct xfrm_mgr *km);
593
594 /*
595 * This structure is used for the duration where packets are being
596 * transformed by IPsec. As soon as the packet leaves IPsec the
597 * area beyond the generic IP part may be overwritten.
598 */
599 struct xfrm_skb_cb {
600 union {
601 struct inet_skb_parm h4;
602 struct inet6_skb_parm h6;
603 } header;
604
605 /* Sequence number for replay protection. */
606 union {
607 struct {
608 __u32 low;
609 __u32 hi;
610 } output;
611 struct {
612 __be32 low;
613 __be32 hi;
614 } input;
615 } seq;
616 };
617
618 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
619
620 /*
621 * This structure is used by the afinfo prepare_input/prepare_output functions
622 * to transmit header information to the mode input/output functions.
623 */
624 struct xfrm_mode_skb_cb {
625 union {
626 struct inet_skb_parm h4;
627 struct inet6_skb_parm h6;
628 } header;
629
630 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
631 __be16 id;
632 __be16 frag_off;
633
634 /* IP header length (excluding options or extension headers). */
635 u8 ihl;
636
637 /* TOS for IPv4, class for IPv6. */
638 u8 tos;
639
640 /* TTL for IPv4, hop limitfor IPv6. */
641 u8 ttl;
642
643 /* Protocol for IPv4, NH for IPv6. */
644 u8 protocol;
645
646 /* Option length for IPv4, zero for IPv6. */
647 u8 optlen;
648
649 /* Used by IPv6 only, zero for IPv4. */
650 u8 flow_lbl[3];
651 };
652
653 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
654
655 /*
656 * This structure is used by the input processing to locate the SPI and
657 * related information.
658 */
659 struct xfrm_spi_skb_cb {
660 union {
661 struct inet_skb_parm h4;
662 struct inet6_skb_parm h6;
663 } header;
664
665 unsigned int daddroff;
666 unsigned int family;
667 };
668
669 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
670
671 /* Audit Information */
672 struct xfrm_audit {
673 u32 secid;
674 uid_t loginuid;
675 u32 sessionid;
676 };
677
678 #ifdef CONFIG_AUDITSYSCALL
679 static inline struct audit_buffer *xfrm_audit_start(const char *op)
680 {
681 struct audit_buffer *audit_buf = NULL;
682
683 if (audit_enabled == 0)
684 return NULL;
685 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
686 AUDIT_MAC_IPSEC_EVENT);
687 if (audit_buf == NULL)
688 return NULL;
689 audit_log_format(audit_buf, "op=%s", op);
690 return audit_buf;
691 }
692
693 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
694 struct audit_buffer *audit_buf)
695 {
696 char *secctx;
697 u32 secctx_len;
698
699 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
700 if (secid != 0 &&
701 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
702 audit_log_format(audit_buf, " subj=%s", secctx);
703 security_release_secctx(secctx, secctx_len);
704 } else
705 audit_log_task_context(audit_buf);
706 }
707
708 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
709 u32 auid, u32 ses, u32 secid);
710 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
711 u32 auid, u32 ses, u32 secid);
712 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
713 u32 auid, u32 ses, u32 secid);
714 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
715 u32 auid, u32 ses, u32 secid);
716 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
717 struct sk_buff *skb);
718 extern void xfrm_audit_state_replay(struct xfrm_state *x,
719 struct sk_buff *skb, __be32 net_seq);
720 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
721 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
722 __be32 net_spi, __be32 net_seq);
723 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
724 struct sk_buff *skb, u8 proto);
725 #else
726
727 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
728 u32 auid, u32 ses, u32 secid)
729 {
730 }
731
732 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
733 u32 auid, u32 ses, u32 secid)
734 {
735 }
736
737 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
738 u32 auid, u32 ses, u32 secid)
739 {
740 }
741
742 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
743 u32 auid, u32 ses, u32 secid)
744 {
745 }
746
747 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
748 struct sk_buff *skb)
749 {
750 }
751
752 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
753 struct sk_buff *skb, __be32 net_seq)
754 {
755 }
756
757 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
758 u16 family)
759 {
760 }
761
762 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
763 __be32 net_spi, __be32 net_seq)
764 {
765 }
766
767 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
768 struct sk_buff *skb, u8 proto)
769 {
770 }
771 #endif /* CONFIG_AUDITSYSCALL */
772
773 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
774 {
775 if (likely(policy != NULL))
776 atomic_inc(&policy->refcnt);
777 }
778
779 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
780
781 static inline void xfrm_pol_put(struct xfrm_policy *policy)
782 {
783 if (atomic_dec_and_test(&policy->refcnt))
784 xfrm_policy_destroy(policy);
785 }
786
787 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
788 {
789 int i;
790 for (i = npols - 1; i >= 0; --i)
791 xfrm_pol_put(pols[i]);
792 }
793
794 extern void __xfrm_state_destroy(struct xfrm_state *);
795
796 static inline void __xfrm_state_put(struct xfrm_state *x)
797 {
798 atomic_dec(&x->refcnt);
799 }
800
801 static inline void xfrm_state_put(struct xfrm_state *x)
802 {
803 if (atomic_dec_and_test(&x->refcnt))
804 __xfrm_state_destroy(x);
805 }
806
807 static inline void xfrm_state_hold(struct xfrm_state *x)
808 {
809 atomic_inc(&x->refcnt);
810 }
811
812 static inline bool addr_match(const void *token1, const void *token2,
813 int prefixlen)
814 {
815 const __be32 *a1 = token1;
816 const __be32 *a2 = token2;
817 int pdw;
818 int pbi;
819
820 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
821 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
822
823 if (pdw)
824 if (memcmp(a1, a2, pdw << 2))
825 return false;
826
827 if (pbi) {
828 __be32 mask;
829
830 mask = htonl((0xffffffff) << (32 - pbi));
831
832 if ((a1[pdw] ^ a2[pdw]) & mask)
833 return false;
834 }
835
836 return true;
837 }
838
839 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
840 {
841 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
842 if (prefixlen == 0)
843 return true;
844 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
845 }
846
847 static __inline__
848 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
849 {
850 __be16 port;
851 switch(fl->flowi_proto) {
852 case IPPROTO_TCP:
853 case IPPROTO_UDP:
854 case IPPROTO_UDPLITE:
855 case IPPROTO_SCTP:
856 port = uli->ports.sport;
857 break;
858 case IPPROTO_ICMP:
859 case IPPROTO_ICMPV6:
860 port = htons(uli->icmpt.type);
861 break;
862 case IPPROTO_MH:
863 port = htons(uli->mht.type);
864 break;
865 case IPPROTO_GRE:
866 port = htons(ntohl(uli->gre_key) >> 16);
867 break;
868 default:
869 port = 0; /*XXX*/
870 }
871 return port;
872 }
873
874 static __inline__
875 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
876 {
877 __be16 port;
878 switch(fl->flowi_proto) {
879 case IPPROTO_TCP:
880 case IPPROTO_UDP:
881 case IPPROTO_UDPLITE:
882 case IPPROTO_SCTP:
883 port = uli->ports.dport;
884 break;
885 case IPPROTO_ICMP:
886 case IPPROTO_ICMPV6:
887 port = htons(uli->icmpt.code);
888 break;
889 case IPPROTO_GRE:
890 port = htons(ntohl(uli->gre_key) & 0xffff);
891 break;
892 default:
893 port = 0; /*XXX*/
894 }
895 return port;
896 }
897
898 extern bool xfrm_selector_match(const struct xfrm_selector *sel,
899 const struct flowi *fl,
900 unsigned short family);
901
902 #ifdef CONFIG_SECURITY_NETWORK_XFRM
903 /* If neither has a context --> match
904 * Otherwise, both must have a context and the sids, doi, alg must match
905 */
906 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
907 {
908 return ((!s1 && !s2) ||
909 (s1 && s2 &&
910 (s1->ctx_sid == s2->ctx_sid) &&
911 (s1->ctx_doi == s2->ctx_doi) &&
912 (s1->ctx_alg == s2->ctx_alg)));
913 }
914 #else
915 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
916 {
917 return true;
918 }
919 #endif
920
921 /* A struct encoding bundle of transformations to apply to some set of flow.
922 *
923 * dst->child points to the next element of bundle.
924 * dst->xfrm points to an instanse of transformer.
925 *
926 * Due to unfortunate limitations of current routing cache, which we
927 * have no time to fix, it mirrors struct rtable and bound to the same
928 * routing key, including saddr,daddr. However, we can have many of
929 * bundles differing by session id. All the bundles grow from a parent
930 * policy rule.
931 */
932 struct xfrm_dst {
933 union {
934 struct dst_entry dst;
935 struct rtable rt;
936 struct rt6_info rt6;
937 } u;
938 struct dst_entry *route;
939 struct flow_cache_object flo;
940 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
941 int num_pols, num_xfrms;
942 #ifdef CONFIG_XFRM_SUB_POLICY
943 struct flowi *origin;
944 struct xfrm_selector *partner;
945 #endif
946 u32 xfrm_genid;
947 u32 policy_genid;
948 u32 route_mtu_cached;
949 u32 child_mtu_cached;
950 u32 route_cookie;
951 u32 path_cookie;
952 };
953
954 #ifdef CONFIG_XFRM
955 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
956 {
957 xfrm_pols_put(xdst->pols, xdst->num_pols);
958 dst_release(xdst->route);
959 if (likely(xdst->u.dst.xfrm))
960 xfrm_state_put(xdst->u.dst.xfrm);
961 #ifdef CONFIG_XFRM_SUB_POLICY
962 kfree(xdst->origin);
963 xdst->origin = NULL;
964 kfree(xdst->partner);
965 xdst->partner = NULL;
966 #endif
967 }
968 #endif
969
970 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
971
972 struct sec_path {
973 atomic_t refcnt;
974 int len;
975 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
976 };
977
978 static inline int secpath_exists(struct sk_buff *skb)
979 {
980 #ifdef CONFIG_XFRM
981 return skb->sp != NULL;
982 #else
983 return 0;
984 #endif
985 }
986
987 static inline struct sec_path *
988 secpath_get(struct sec_path *sp)
989 {
990 if (sp)
991 atomic_inc(&sp->refcnt);
992 return sp;
993 }
994
995 extern void __secpath_destroy(struct sec_path *sp);
996
997 static inline void
998 secpath_put(struct sec_path *sp)
999 {
1000 if (sp && atomic_dec_and_test(&sp->refcnt))
1001 __secpath_destroy(sp);
1002 }
1003
1004 extern struct sec_path *secpath_dup(struct sec_path *src);
1005
1006 static inline void
1007 secpath_reset(struct sk_buff *skb)
1008 {
1009 #ifdef CONFIG_XFRM
1010 secpath_put(skb->sp);
1011 skb->sp = NULL;
1012 #endif
1013 }
1014
1015 static inline int
1016 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1017 {
1018 switch (family) {
1019 case AF_INET:
1020 return addr->a4 == 0;
1021 case AF_INET6:
1022 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1023 }
1024 return 0;
1025 }
1026
1027 static inline int
1028 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1029 {
1030 return (tmpl->saddr.a4 &&
1031 tmpl->saddr.a4 != x->props.saddr.a4);
1032 }
1033
1034 static inline int
1035 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1036 {
1037 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1038 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1039 }
1040
1041 static inline int
1042 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1043 {
1044 switch (family) {
1045 case AF_INET:
1046 return __xfrm4_state_addr_cmp(tmpl, x);
1047 case AF_INET6:
1048 return __xfrm6_state_addr_cmp(tmpl, x);
1049 }
1050 return !0;
1051 }
1052
1053 #ifdef CONFIG_XFRM
1054 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1055
1056 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1057 struct sk_buff *skb,
1058 unsigned int family, int reverse)
1059 {
1060 struct net *net = dev_net(skb->dev);
1061 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1062
1063 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1064 return __xfrm_policy_check(sk, ndir, skb, family);
1065
1066 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1067 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1068 __xfrm_policy_check(sk, ndir, skb, family);
1069 }
1070
1071 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1072 {
1073 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1074 }
1075
1076 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1077 {
1078 return xfrm_policy_check(sk, dir, skb, AF_INET);
1079 }
1080
1081 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1082 {
1083 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1084 }
1085
1086 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1087 struct sk_buff *skb)
1088 {
1089 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1090 }
1091
1092 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1093 struct sk_buff *skb)
1094 {
1095 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1096 }
1097
1098 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1099 unsigned int family, int reverse);
1100
1101 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1102 unsigned int family)
1103 {
1104 return __xfrm_decode_session(skb, fl, family, 0);
1105 }
1106
1107 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1108 struct flowi *fl,
1109 unsigned int family)
1110 {
1111 return __xfrm_decode_session(skb, fl, family, 1);
1112 }
1113
1114 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1115
1116 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1117 {
1118 struct net *net = dev_net(skb->dev);
1119
1120 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1121 (skb_dst(skb)->flags & DST_NOXFRM) ||
1122 __xfrm_route_forward(skb, family);
1123 }
1124
1125 static inline int xfrm4_route_forward(struct sk_buff *skb)
1126 {
1127 return xfrm_route_forward(skb, AF_INET);
1128 }
1129
1130 static inline int xfrm6_route_forward(struct sk_buff *skb)
1131 {
1132 return xfrm_route_forward(skb, AF_INET6);
1133 }
1134
1135 extern int __xfrm_sk_clone_policy(struct sock *sk);
1136
1137 static inline int xfrm_sk_clone_policy(struct sock *sk)
1138 {
1139 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1140 return __xfrm_sk_clone_policy(sk);
1141 return 0;
1142 }
1143
1144 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1145
1146 static inline void xfrm_sk_free_policy(struct sock *sk)
1147 {
1148 if (unlikely(sk->sk_policy[0] != NULL)) {
1149 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1150 sk->sk_policy[0] = NULL;
1151 }
1152 if (unlikely(sk->sk_policy[1] != NULL)) {
1153 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1154 sk->sk_policy[1] = NULL;
1155 }
1156 }
1157
1158 #else
1159
1160 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1161 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1162 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1163 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1164 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1165 {
1166 return 1;
1167 }
1168 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1169 {
1170 return 1;
1171 }
1172 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1173 {
1174 return 1;
1175 }
1176 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1177 struct flowi *fl,
1178 unsigned int family)
1179 {
1180 return -ENOSYS;
1181 }
1182 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1183 struct sk_buff *skb)
1184 {
1185 return 1;
1186 }
1187 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1188 struct sk_buff *skb)
1189 {
1190 return 1;
1191 }
1192 #endif
1193
1194 static __inline__
1195 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1196 {
1197 switch (family){
1198 case AF_INET:
1199 return (xfrm_address_t *)&fl->u.ip4.daddr;
1200 case AF_INET6:
1201 return (xfrm_address_t *)&fl->u.ip6.daddr;
1202 }
1203 return NULL;
1204 }
1205
1206 static __inline__
1207 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1208 {
1209 switch (family){
1210 case AF_INET:
1211 return (xfrm_address_t *)&fl->u.ip4.saddr;
1212 case AF_INET6:
1213 return (xfrm_address_t *)&fl->u.ip6.saddr;
1214 }
1215 return NULL;
1216 }
1217
1218 static __inline__
1219 void xfrm_flowi_addr_get(const struct flowi *fl,
1220 xfrm_address_t *saddr, xfrm_address_t *daddr,
1221 unsigned short family)
1222 {
1223 switch(family) {
1224 case AF_INET:
1225 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1226 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1227 break;
1228 case AF_INET6:
1229 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1230 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1231 break;
1232 }
1233 }
1234
1235 static __inline__ int
1236 __xfrm4_state_addr_check(const struct xfrm_state *x,
1237 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1238 {
1239 if (daddr->a4 == x->id.daddr.a4 &&
1240 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1241 return 1;
1242 return 0;
1243 }
1244
1245 static __inline__ int
1246 __xfrm6_state_addr_check(const struct xfrm_state *x,
1247 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1248 {
1249 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1250 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1251 ipv6_addr_any((struct in6_addr *)saddr) ||
1252 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1253 return 1;
1254 return 0;
1255 }
1256
1257 static __inline__ int
1258 xfrm_state_addr_check(const struct xfrm_state *x,
1259 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1260 unsigned short family)
1261 {
1262 switch (family) {
1263 case AF_INET:
1264 return __xfrm4_state_addr_check(x, daddr, saddr);
1265 case AF_INET6:
1266 return __xfrm6_state_addr_check(x, daddr, saddr);
1267 }
1268 return 0;
1269 }
1270
1271 static __inline__ int
1272 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1273 unsigned short family)
1274 {
1275 switch (family) {
1276 case AF_INET:
1277 return __xfrm4_state_addr_check(x,
1278 (const xfrm_address_t *)&fl->u.ip4.daddr,
1279 (const xfrm_address_t *)&fl->u.ip4.saddr);
1280 case AF_INET6:
1281 return __xfrm6_state_addr_check(x,
1282 (const xfrm_address_t *)&fl->u.ip6.daddr,
1283 (const xfrm_address_t *)&fl->u.ip6.saddr);
1284 }
1285 return 0;
1286 }
1287
1288 static inline int xfrm_state_kern(const struct xfrm_state *x)
1289 {
1290 return atomic_read(&x->tunnel_users);
1291 }
1292
1293 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1294 {
1295 return (!userproto || proto == userproto ||
1296 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1297 proto == IPPROTO_ESP ||
1298 proto == IPPROTO_COMP)));
1299 }
1300
1301 /*
1302 * xfrm algorithm information
1303 */
1304 struct xfrm_algo_aead_info {
1305 u16 icv_truncbits;
1306 };
1307
1308 struct xfrm_algo_auth_info {
1309 u16 icv_truncbits;
1310 u16 icv_fullbits;
1311 };
1312
1313 struct xfrm_algo_encr_info {
1314 u16 blockbits;
1315 u16 defkeybits;
1316 };
1317
1318 struct xfrm_algo_comp_info {
1319 u16 threshold;
1320 };
1321
1322 struct xfrm_algo_desc {
1323 char *name;
1324 char *compat;
1325 u8 available:1;
1326 union {
1327 struct xfrm_algo_aead_info aead;
1328 struct xfrm_algo_auth_info auth;
1329 struct xfrm_algo_encr_info encr;
1330 struct xfrm_algo_comp_info comp;
1331 } uinfo;
1332 struct sadb_alg desc;
1333 };
1334
1335 /* XFRM tunnel handlers. */
1336 struct xfrm_tunnel {
1337 int (*handler)(struct sk_buff *skb);
1338 int (*err_handler)(struct sk_buff *skb, u32 info);
1339
1340 struct xfrm_tunnel __rcu *next;
1341 int priority;
1342 };
1343
1344 struct xfrm6_tunnel {
1345 int (*handler)(struct sk_buff *skb);
1346 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1347 u8 type, u8 code, int offset, __be32 info);
1348 struct xfrm6_tunnel __rcu *next;
1349 int priority;
1350 };
1351
1352 extern void xfrm_init(void);
1353 extern void xfrm4_init(int rt_hash_size);
1354 extern int xfrm_state_init(struct net *net);
1355 extern void xfrm_state_fini(struct net *net);
1356 extern void xfrm4_state_init(void);
1357 #ifdef CONFIG_XFRM
1358 extern int xfrm6_init(void);
1359 extern void xfrm6_fini(void);
1360 extern int xfrm6_state_init(void);
1361 extern void xfrm6_state_fini(void);
1362 #else
1363 static inline int xfrm6_init(void)
1364 {
1365 return 0;
1366 }
1367 static inline void xfrm6_fini(void)
1368 {
1369 ;
1370 }
1371 #endif
1372
1373 #ifdef CONFIG_XFRM_STATISTICS
1374 extern int xfrm_proc_init(struct net *net);
1375 extern void xfrm_proc_fini(struct net *net);
1376 #endif
1377
1378 extern int xfrm_sysctl_init(struct net *net);
1379 #ifdef CONFIG_SYSCTL
1380 extern void xfrm_sysctl_fini(struct net *net);
1381 #else
1382 static inline void xfrm_sysctl_fini(struct net *net)
1383 {
1384 }
1385 #endif
1386
1387 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1388 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1389 int (*func)(struct xfrm_state *, int, void*), void *);
1390 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1391 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1392 extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1393 const xfrm_address_t *saddr,
1394 const struct flowi *fl,
1395 struct xfrm_tmpl *tmpl,
1396 struct xfrm_policy *pol, int *err,
1397 unsigned short family);
1398 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1399 xfrm_address_t *daddr,
1400 xfrm_address_t *saddr,
1401 unsigned short family,
1402 u8 mode, u8 proto, u32 reqid);
1403 extern int xfrm_state_check_expire(struct xfrm_state *x);
1404 extern void xfrm_state_insert(struct xfrm_state *x);
1405 extern int xfrm_state_add(struct xfrm_state *x);
1406 extern int xfrm_state_update(struct xfrm_state *x);
1407 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1408 const xfrm_address_t *daddr, __be32 spi,
1409 u8 proto, unsigned short family);
1410 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1411 const xfrm_address_t *daddr,
1412 const xfrm_address_t *saddr,
1413 u8 proto,
1414 unsigned short family);
1415 #ifdef CONFIG_XFRM_SUB_POLICY
1416 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1417 int n, unsigned short family);
1418 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1419 int n, unsigned short family);
1420 #else
1421 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1422 int n, unsigned short family)
1423 {
1424 return -ENOSYS;
1425 }
1426
1427 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1428 int n, unsigned short family)
1429 {
1430 return -ENOSYS;
1431 }
1432 #endif
1433
1434 struct xfrmk_sadinfo {
1435 u32 sadhcnt; /* current hash bkts */
1436 u32 sadhmcnt; /* max allowed hash bkts */
1437 u32 sadcnt; /* current running count */
1438 };
1439
1440 struct xfrmk_spdinfo {
1441 u32 incnt;
1442 u32 outcnt;
1443 u32 fwdcnt;
1444 u32 inscnt;
1445 u32 outscnt;
1446 u32 fwdscnt;
1447 u32 spdhcnt;
1448 u32 spdhmcnt;
1449 };
1450
1451 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1452 u32 seq);
1453 extern int xfrm_state_delete(struct xfrm_state *x);
1454 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1455 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1456 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1457 extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1458 extern int xfrm_init_replay(struct xfrm_state *x);
1459 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1460 extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1461 extern int xfrm_init_state(struct xfrm_state *x);
1462 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1463 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1464 int encap_type);
1465 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1466 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1467 extern int xfrm_output(struct sk_buff *skb);
1468 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1469 extern int xfrm4_extract_header(struct sk_buff *skb);
1470 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1471 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1472 int encap_type);
1473 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1474 extern int xfrm4_rcv(struct sk_buff *skb);
1475
1476 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1477 {
1478 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1479 }
1480
1481 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1482 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1483 extern int xfrm4_output(struct sk_buff *skb);
1484 extern int xfrm4_output_finish(struct sk_buff *skb);
1485 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1486 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1487 extern int xfrm4_mode_tunnel_input_register(struct xfrm_tunnel *handler);
1488 extern int xfrm4_mode_tunnel_input_deregister(struct xfrm_tunnel *handler);
1489 extern int xfrm6_extract_header(struct sk_buff *skb);
1490 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1491 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1492 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1493 extern int xfrm6_rcv(struct sk_buff *skb);
1494 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1495 xfrm_address_t *saddr, u8 proto);
1496 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1497 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1498 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1499 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1500 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1501 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1502 extern int xfrm6_output(struct sk_buff *skb);
1503 extern int xfrm6_output_finish(struct sk_buff *skb);
1504 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1505 u8 **prevhdr);
1506
1507 #ifdef CONFIG_XFRM
1508 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1509 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1510 #else
1511 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1512 {
1513 return -ENOPROTOOPT;
1514 }
1515
1516 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1517 {
1518 /* should not happen */
1519 kfree_skb(skb);
1520 return 0;
1521 }
1522 #endif
1523
1524 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1525
1526 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1527 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1528 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1529 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1530 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1531 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1532 u8 type, int dir,
1533 struct xfrm_selector *sel,
1534 struct xfrm_sec_ctx *ctx, int delete,
1535 int *err);
1536 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1537 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1538 u32 xfrm_get_acqseq(void);
1539 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1540 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1541 u8 mode, u32 reqid, u8 proto,
1542 const xfrm_address_t *daddr,
1543 const xfrm_address_t *saddr, int create,
1544 unsigned short family);
1545 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1546
1547 #ifdef CONFIG_XFRM_MIGRATE
1548 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1549 const struct xfrm_migrate *m, int num_bundles,
1550 const struct xfrm_kmaddress *k);
1551 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1552 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1553 struct xfrm_migrate *m);
1554 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1555 struct xfrm_migrate *m, int num_bundles,
1556 struct xfrm_kmaddress *k);
1557 #endif
1558
1559 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1560 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1561 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1562
1563 extern void xfrm_input_init(void);
1564 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1565
1566 extern void xfrm_probe_algs(void);
1567 extern int xfrm_count_auth_supported(void);
1568 extern int xfrm_count_enc_supported(void);
1569 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1570 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1571 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1572 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1573 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1574 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1575 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1576 extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1577 extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1578 int probe);
1579
1580 static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1581 const xfrm_address_t *b,
1582 int family)
1583 {
1584 switch (family) {
1585 default:
1586 case AF_INET:
1587 return (__force u32)a->a4 - (__force u32)b->a4;
1588 case AF_INET6:
1589 return ipv6_addr_cmp((const struct in6_addr *)a,
1590 (const struct in6_addr *)b);
1591 }
1592 }
1593
1594 static inline int xfrm_policy_id2dir(u32 index)
1595 {
1596 return index & 7;
1597 }
1598
1599 #ifdef CONFIG_XFRM
1600 static inline int xfrm_aevent_is_on(struct net *net)
1601 {
1602 struct sock *nlsk;
1603 int ret = 0;
1604
1605 rcu_read_lock();
1606 nlsk = rcu_dereference(net->xfrm.nlsk);
1607 if (nlsk)
1608 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1609 rcu_read_unlock();
1610 return ret;
1611 }
1612 #endif
1613
1614 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1615 {
1616 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1617 }
1618
1619 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1620 {
1621 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1622 }
1623
1624 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1625 {
1626 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1627 }
1628
1629 #ifdef CONFIG_XFRM_MIGRATE
1630 static inline int xfrm_replay_clone(struct xfrm_state *x,
1631 struct xfrm_state *orig)
1632 {
1633 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1634 GFP_KERNEL);
1635 if (!x->replay_esn)
1636 return -ENOMEM;
1637
1638 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1639 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1640
1641 x->preplay_esn = kmemdup(x->replay_esn,
1642 xfrm_replay_state_esn_len(x->replay_esn),
1643 GFP_KERNEL);
1644 if (!x->preplay_esn) {
1645 kfree(x->replay_esn);
1646 return -ENOMEM;
1647 }
1648
1649 return 0;
1650 }
1651
1652 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1653 {
1654 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1655 }
1656
1657 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1658 {
1659 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1660 }
1661
1662 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1663 {
1664 int i;
1665 for (i = 0; i < n; i++)
1666 xfrm_state_put(*(states + i));
1667 }
1668
1669 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1670 {
1671 int i;
1672 for (i = 0; i < n; i++)
1673 xfrm_state_delete(*(states + i));
1674 }
1675 #endif
1676
1677 #ifdef CONFIG_XFRM
1678 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1679 {
1680 return skb->sp->xvec[skb->sp->len - 1];
1681 }
1682 #endif
1683
1684 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1685 {
1686 if (attrs[XFRMA_MARK])
1687 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1688 else
1689 m->v = m->m = 0;
1690
1691 return m->v & m->m;
1692 }
1693
1694 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1695 {
1696 int ret = 0;
1697
1698 if (m->m | m->v)
1699 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1700 return ret;
1701 }
1702
1703 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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