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xfrm: Fix crashes in xfrm_lookup()
[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
16 #include <net/sock.h>
17 #include <net/dst.h>
18 #include <net/ip.h>
19 #include <net/route.h>
20 #include <net/ipv6.h>
21 #include <net/ip6_fib.h>
22 #include <net/flow.h>
23
24 #include <linux/interrupt.h>
25
26 #ifdef CONFIG_XFRM_STATISTICS
27 #include <net/snmp.h>
28 #endif
29
30 #define XFRM_PROTO_ESP 50
31 #define XFRM_PROTO_AH 51
32 #define XFRM_PROTO_COMP 108
33 #define XFRM_PROTO_IPIP 4
34 #define XFRM_PROTO_IPV6 41
35 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
36 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
37
38 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
39 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
40 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
41 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
42 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
43
44 #ifdef CONFIG_XFRM_STATISTICS
45 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
46 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
47 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
48 #else
49 #define XFRM_INC_STATS(net, field) ((void)(net))
50 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
51 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
52 #endif
53
54 extern struct mutex xfrm_cfg_mutex;
55
56 /* Organization of SPD aka "XFRM rules"
57 ------------------------------------
58
59 Basic objects:
60 - policy rule, struct xfrm_policy (=SPD entry)
61 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
62 - instance of a transformer, struct xfrm_state (=SA)
63 - template to clone xfrm_state, struct xfrm_tmpl
64
65 SPD is plain linear list of xfrm_policy rules, ordered by priority.
66 (To be compatible with existing pfkeyv2 implementations,
67 many rules with priority of 0x7fffffff are allowed to exist and
68 such rules are ordered in an unpredictable way, thanks to bsd folks.)
69
70 Lookup is plain linear search until the first match with selector.
71
72 If "action" is "block", then we prohibit the flow, otherwise:
73 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
74 policy entry has list of up to XFRM_MAX_DEPTH transformations,
75 described by templates xfrm_tmpl. Each template is resolved
76 to a complete xfrm_state (see below) and we pack bundle of transformations
77 to a dst_entry returned to requestor.
78
79 dst -. xfrm .-> xfrm_state #1
80 |---. child .-> dst -. xfrm .-> xfrm_state #2
81 |---. child .-> dst -. xfrm .-> xfrm_state #3
82 |---. child .-> NULL
83
84 Bundles are cached at xrfm_policy struct (field ->bundles).
85
86
87 Resolution of xrfm_tmpl
88 -----------------------
89 Template contains:
90 1. ->mode Mode: transport or tunnel
91 2. ->id.proto Protocol: AH/ESP/IPCOMP
92 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
93 Q: allow to resolve security gateway?
94 4. ->id.spi If not zero, static SPI.
95 5. ->saddr Local tunnel endpoint, ignored for transport mode.
96 6. ->algos List of allowed algos. Plain bitmask now.
97 Q: ealgos, aalgos, calgos. What a mess...
98 7. ->share Sharing mode.
99 Q: how to implement private sharing mode? To add struct sock* to
100 flow id?
101
102 Having this template we search through SAD searching for entries
103 with appropriate mode/proto/algo, permitted by selector.
104 If no appropriate entry found, it is requested from key manager.
105
106 PROBLEMS:
107 Q: How to find all the bundles referring to a physical path for
108 PMTU discovery? Seems, dst should contain list of all parents...
109 and enter to infinite locking hierarchy disaster.
110 No! It is easier, we will not search for them, let them find us.
111 We add genid to each dst plus pointer to genid of raw IP route,
112 pmtu disc will update pmtu on raw IP route and increase its genid.
113 dst_check() will see this for top level and trigger resyncing
114 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
115 */
116
117 struct xfrm_state_walk {
118 struct list_head all;
119 u8 state;
120 union {
121 u8 dying;
122 u8 proto;
123 };
124 u32 seq;
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
146 u32 genid;
147
148 /* Key manager bits */
149 struct xfrm_state_walk km;
150
151 /* Parameters of this state. */
152 struct {
153 u32 reqid;
154 u8 mode;
155 u8 replay_window;
156 u8 aalgo, ealgo, calgo;
157 u8 flags;
158 u16 family;
159 xfrm_address_t saddr;
160 int header_len;
161 int trailer_len;
162 } props;
163
164 struct xfrm_lifetime_cfg lft;
165
166 /* Data for transformer */
167 struct xfrm_algo_auth *aalg;
168 struct xfrm_algo *ealg;
169 struct xfrm_algo *calg;
170 struct xfrm_algo_aead *aead;
171
172 /* Data for encapsulator */
173 struct xfrm_encap_tmpl *encap;
174
175 /* Data for care-of address */
176 xfrm_address_t *coaddr;
177
178 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
179 struct xfrm_state *tunnel;
180
181 /* If a tunnel, number of users + 1 */
182 atomic_t tunnel_users;
183
184 /* State for replay detection */
185 struct xfrm_replay_state replay;
186
187 /* Replay detection state at the time we sent the last notification */
188 struct xfrm_replay_state preplay;
189
190 /* internal flag that only holds state for delayed aevent at the
191 * moment
192 */
193 u32 xflags;
194
195 /* Replay detection notification settings */
196 u32 replay_maxage;
197 u32 replay_maxdiff;
198
199 /* Replay detection notification timer */
200 struct timer_list rtimer;
201
202 /* Statistics */
203 struct xfrm_stats stats;
204
205 struct xfrm_lifetime_cur curlft;
206 struct tasklet_hrtimer mtimer;
207
208 /* Last used time */
209 unsigned long lastused;
210
211 /* Reference to data common to all the instances of this
212 * transformer. */
213 const struct xfrm_type *type;
214 struct xfrm_mode *inner_mode;
215 struct xfrm_mode *inner_mode_iaf;
216 struct xfrm_mode *outer_mode;
217
218 /* Security context */
219 struct xfrm_sec_ctx *security;
220
221 /* Private data of this transformer, format is opaque,
222 * interpreted by xfrm_type methods. */
223 void *data;
224 };
225
226 static inline struct net *xs_net(struct xfrm_state *x)
227 {
228 return read_pnet(&x->xs_net);
229 }
230
231 /* xflags - make enum if more show up */
232 #define XFRM_TIME_DEFER 1
233
234 enum {
235 XFRM_STATE_VOID,
236 XFRM_STATE_ACQ,
237 XFRM_STATE_VALID,
238 XFRM_STATE_ERROR,
239 XFRM_STATE_EXPIRED,
240 XFRM_STATE_DEAD
241 };
242
243 /* callback structure passed from either netlink or pfkey */
244 struct km_event {
245 union {
246 u32 hard;
247 u32 proto;
248 u32 byid;
249 u32 aevent;
250 u32 type;
251 } data;
252
253 u32 seq;
254 u32 pid;
255 u32 event;
256 struct net *net;
257 };
258
259 struct net_device;
260 struct xfrm_type;
261 struct xfrm_dst;
262 struct xfrm_policy_afinfo {
263 unsigned short family;
264 struct dst_ops *dst_ops;
265 void (*garbage_collect)(struct net *net);
266 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
267 xfrm_address_t *saddr,
268 xfrm_address_t *daddr);
269 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
270 void (*decode_session)(struct sk_buff *skb,
271 struct flowi *fl,
272 int reverse);
273 int (*get_tos)(struct flowi *fl);
274 int (*init_path)(struct xfrm_dst *path,
275 struct dst_entry *dst,
276 int nfheader_len);
277 int (*fill_dst)(struct xfrm_dst *xdst,
278 struct net_device *dev,
279 struct flowi *fl);
280 };
281
282 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
283 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
284 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
285 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
286
287 struct xfrm_tmpl;
288 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
289 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
290 extern int __xfrm_state_delete(struct xfrm_state *x);
291
292 struct xfrm_state_afinfo {
293 unsigned int family;
294 unsigned int proto;
295 __be16 eth_proto;
296 struct module *owner;
297 const struct xfrm_type *type_map[IPPROTO_MAX];
298 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
299 int (*init_flags)(struct xfrm_state *x);
300 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
301 struct xfrm_tmpl *tmpl,
302 xfrm_address_t *daddr, xfrm_address_t *saddr);
303 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
304 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
305 int (*output)(struct sk_buff *skb);
306 int (*extract_input)(struct xfrm_state *x,
307 struct sk_buff *skb);
308 int (*extract_output)(struct xfrm_state *x,
309 struct sk_buff *skb);
310 int (*transport_finish)(struct sk_buff *skb,
311 int async);
312 };
313
314 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
315 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
316
317 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
318
319 struct xfrm_type {
320 char *description;
321 struct module *owner;
322 u8 proto;
323 u8 flags;
324 #define XFRM_TYPE_NON_FRAGMENT 1
325 #define XFRM_TYPE_REPLAY_PROT 2
326 #define XFRM_TYPE_LOCAL_COADDR 4
327 #define XFRM_TYPE_REMOTE_COADDR 8
328
329 int (*init_state)(struct xfrm_state *x);
330 void (*destructor)(struct xfrm_state *);
331 int (*input)(struct xfrm_state *, struct sk_buff *skb);
332 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
333 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
334 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
335 /* Estimate maximal size of result of transformation of a dgram */
336 u32 (*get_mtu)(struct xfrm_state *, int size);
337 };
338
339 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
340 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
341
342 struct xfrm_mode {
343 /*
344 * Remove encapsulation header.
345 *
346 * The IP header will be moved over the top of the encapsulation
347 * header.
348 *
349 * On entry, the transport header shall point to where the IP header
350 * should be and the network header shall be set to where the IP
351 * header currently is. skb->data shall point to the start of the
352 * payload.
353 */
354 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
355
356 /*
357 * This is the actual input entry point.
358 *
359 * For transport mode and equivalent this would be identical to
360 * input2 (which does not need to be set). While tunnel mode
361 * and equivalent would set this to the tunnel encapsulation function
362 * xfrm4_prepare_input that would in turn call input2.
363 */
364 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
365
366 /*
367 * Add encapsulation header.
368 *
369 * On exit, the transport header will be set to the start of the
370 * encapsulation header to be filled in by x->type->output and
371 * the mac header will be set to the nextheader (protocol for
372 * IPv4) field of the extension header directly preceding the
373 * encapsulation header, or in its absence, that of the top IP
374 * header. The value of the network header will always point
375 * to the top IP header while skb->data will point to the payload.
376 */
377 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
378
379 /*
380 * This is the actual output entry point.
381 *
382 * For transport mode and equivalent this would be identical to
383 * output2 (which does not need to be set). While tunnel mode
384 * and equivalent would set this to a tunnel encapsulation function
385 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
386 * call output2.
387 */
388 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
389
390 struct xfrm_state_afinfo *afinfo;
391 struct module *owner;
392 unsigned int encap;
393 int flags;
394 };
395
396 /* Flags for xfrm_mode. */
397 enum {
398 XFRM_MODE_FLAG_TUNNEL = 1,
399 };
400
401 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
402 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
403
404 static inline int xfrm_af2proto(unsigned int family)
405 {
406 switch(family) {
407 case AF_INET:
408 return IPPROTO_IPIP;
409 case AF_INET6:
410 return IPPROTO_IPV6;
411 default:
412 return 0;
413 }
414 }
415
416 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
417 {
418 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
419 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
420 return x->inner_mode;
421 else
422 return x->inner_mode_iaf;
423 }
424
425 struct xfrm_tmpl {
426 /* id in template is interpreted as:
427 * daddr - destination of tunnel, may be zero for transport mode.
428 * spi - zero to acquire spi. Not zero if spi is static, then
429 * daddr must be fixed too.
430 * proto - AH/ESP/IPCOMP
431 */
432 struct xfrm_id id;
433
434 /* Source address of tunnel. Ignored, if it is not a tunnel. */
435 xfrm_address_t saddr;
436
437 unsigned short encap_family;
438
439 u32 reqid;
440
441 /* Mode: transport, tunnel etc. */
442 u8 mode;
443
444 /* Sharing mode: unique, this session only, this user only etc. */
445 u8 share;
446
447 /* May skip this transfomration if no SA is found */
448 u8 optional;
449
450 /* Skip aalgos/ealgos/calgos checks. */
451 u8 allalgs;
452
453 /* Bit mask of algos allowed for acquisition */
454 u32 aalgos;
455 u32 ealgos;
456 u32 calgos;
457 };
458
459 #define XFRM_MAX_DEPTH 6
460
461 struct xfrm_policy_walk_entry {
462 struct list_head all;
463 u8 dead;
464 };
465
466 struct xfrm_policy_walk {
467 struct xfrm_policy_walk_entry walk;
468 u8 type;
469 u32 seq;
470 };
471
472 struct xfrm_policy {
473 #ifdef CONFIG_NET_NS
474 struct net *xp_net;
475 #endif
476 struct hlist_node bydst;
477 struct hlist_node byidx;
478
479 /* This lock only affects elements except for entry. */
480 rwlock_t lock;
481 atomic_t refcnt;
482 struct timer_list timer;
483
484 struct flow_cache_object flo;
485 atomic_t genid;
486 u32 priority;
487 u32 index;
488 struct xfrm_mark mark;
489 struct xfrm_selector selector;
490 struct xfrm_lifetime_cfg lft;
491 struct xfrm_lifetime_cur curlft;
492 struct xfrm_policy_walk_entry walk;
493 u8 type;
494 u8 action;
495 u8 flags;
496 u8 xfrm_nr;
497 u16 family;
498 struct xfrm_sec_ctx *security;
499 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
500 };
501
502 static inline struct net *xp_net(struct xfrm_policy *xp)
503 {
504 return read_pnet(&xp->xp_net);
505 }
506
507 struct xfrm_kmaddress {
508 xfrm_address_t local;
509 xfrm_address_t remote;
510 u32 reserved;
511 u16 family;
512 };
513
514 struct xfrm_migrate {
515 xfrm_address_t old_daddr;
516 xfrm_address_t old_saddr;
517 xfrm_address_t new_daddr;
518 xfrm_address_t new_saddr;
519 u8 proto;
520 u8 mode;
521 u16 reserved;
522 u32 reqid;
523 u16 old_family;
524 u16 new_family;
525 };
526
527 #define XFRM_KM_TIMEOUT 30
528 /* which seqno */
529 #define XFRM_REPLAY_SEQ 1
530 #define XFRM_REPLAY_OSEQ 2
531 #define XFRM_REPLAY_SEQ_MASK 3
532 /* what happened */
533 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
534 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
535
536 /* default aevent timeout in units of 100ms */
537 #define XFRM_AE_ETIME 10
538 /* Async Event timer multiplier */
539 #define XFRM_AE_ETH_M 10
540 /* default seq threshold size */
541 #define XFRM_AE_SEQT_SIZE 2
542
543 struct xfrm_mgr {
544 struct list_head list;
545 char *id;
546 int (*notify)(struct xfrm_state *x, struct km_event *c);
547 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
548 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
549 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
550 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
551 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
552 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
553 };
554
555 extern int xfrm_register_km(struct xfrm_mgr *km);
556 extern int xfrm_unregister_km(struct xfrm_mgr *km);
557
558 /*
559 * This structure is used for the duration where packets are being
560 * transformed by IPsec. As soon as the packet leaves IPsec the
561 * area beyond the generic IP part may be overwritten.
562 */
563 struct xfrm_skb_cb {
564 union {
565 struct inet_skb_parm h4;
566 struct inet6_skb_parm h6;
567 } header;
568
569 /* Sequence number for replay protection. */
570 union {
571 u64 output;
572 __be32 input;
573 } seq;
574 };
575
576 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
577
578 /*
579 * This structure is used by the afinfo prepare_input/prepare_output functions
580 * to transmit header information to the mode input/output functions.
581 */
582 struct xfrm_mode_skb_cb {
583 union {
584 struct inet_skb_parm h4;
585 struct inet6_skb_parm h6;
586 } header;
587
588 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
589 __be16 id;
590 __be16 frag_off;
591
592 /* IP header length (excluding options or extension headers). */
593 u8 ihl;
594
595 /* TOS for IPv4, class for IPv6. */
596 u8 tos;
597
598 /* TTL for IPv4, hop limitfor IPv6. */
599 u8 ttl;
600
601 /* Protocol for IPv4, NH for IPv6. */
602 u8 protocol;
603
604 /* Option length for IPv4, zero for IPv6. */
605 u8 optlen;
606
607 /* Used by IPv6 only, zero for IPv4. */
608 u8 flow_lbl[3];
609 };
610
611 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
612
613 /*
614 * This structure is used by the input processing to locate the SPI and
615 * related information.
616 */
617 struct xfrm_spi_skb_cb {
618 union {
619 struct inet_skb_parm h4;
620 struct inet6_skb_parm h6;
621 } header;
622
623 unsigned int daddroff;
624 unsigned int family;
625 };
626
627 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
628
629 /* Audit Information */
630 struct xfrm_audit {
631 u32 secid;
632 uid_t loginuid;
633 u32 sessionid;
634 };
635
636 #ifdef CONFIG_AUDITSYSCALL
637 static inline struct audit_buffer *xfrm_audit_start(const char *op)
638 {
639 struct audit_buffer *audit_buf = NULL;
640
641 if (audit_enabled == 0)
642 return NULL;
643 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
644 AUDIT_MAC_IPSEC_EVENT);
645 if (audit_buf == NULL)
646 return NULL;
647 audit_log_format(audit_buf, "op=%s", op);
648 return audit_buf;
649 }
650
651 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
652 struct audit_buffer *audit_buf)
653 {
654 char *secctx;
655 u32 secctx_len;
656
657 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
658 if (secid != 0 &&
659 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
660 audit_log_format(audit_buf, " subj=%s", secctx);
661 security_release_secctx(secctx, secctx_len);
662 } else
663 audit_log_task_context(audit_buf);
664 }
665
666 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
667 u32 auid, u32 ses, u32 secid);
668 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
669 u32 auid, u32 ses, u32 secid);
670 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
671 u32 auid, u32 ses, u32 secid);
672 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
673 u32 auid, u32 ses, u32 secid);
674 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
675 struct sk_buff *skb);
676 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
677 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
678 __be32 net_spi, __be32 net_seq);
679 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
680 struct sk_buff *skb, u8 proto);
681 #else
682
683 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
684 u32 auid, u32 ses, u32 secid)
685 {
686 }
687
688 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
689 u32 auid, u32 ses, u32 secid)
690 {
691 }
692
693 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
694 u32 auid, u32 ses, u32 secid)
695 {
696 }
697
698 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
699 u32 auid, u32 ses, u32 secid)
700 {
701 }
702
703 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
704 struct sk_buff *skb)
705 {
706 }
707
708 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
709 u16 family)
710 {
711 }
712
713 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
714 __be32 net_spi, __be32 net_seq)
715 {
716 }
717
718 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
719 struct sk_buff *skb, u8 proto)
720 {
721 }
722 #endif /* CONFIG_AUDITSYSCALL */
723
724 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
725 {
726 if (likely(policy != NULL))
727 atomic_inc(&policy->refcnt);
728 }
729
730 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
731
732 static inline void xfrm_pol_put(struct xfrm_policy *policy)
733 {
734 if (atomic_dec_and_test(&policy->refcnt))
735 xfrm_policy_destroy(policy);
736 }
737
738 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
739 {
740 int i;
741 for (i = npols - 1; i >= 0; --i)
742 xfrm_pol_put(pols[i]);
743 }
744
745 extern void __xfrm_state_destroy(struct xfrm_state *);
746
747 static inline void __xfrm_state_put(struct xfrm_state *x)
748 {
749 atomic_dec(&x->refcnt);
750 }
751
752 static inline void xfrm_state_put(struct xfrm_state *x)
753 {
754 if (atomic_dec_and_test(&x->refcnt))
755 __xfrm_state_destroy(x);
756 }
757
758 static inline void xfrm_state_hold(struct xfrm_state *x)
759 {
760 atomic_inc(&x->refcnt);
761 }
762
763 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
764 {
765 __be32 *a1 = token1;
766 __be32 *a2 = token2;
767 int pdw;
768 int pbi;
769
770 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
771 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
772
773 if (pdw)
774 if (memcmp(a1, a2, pdw << 2))
775 return 0;
776
777 if (pbi) {
778 __be32 mask;
779
780 mask = htonl((0xffffffff) << (32 - pbi));
781
782 if ((a1[pdw] ^ a2[pdw]) & mask)
783 return 0;
784 }
785
786 return 1;
787 }
788
789 static __inline__
790 __be16 xfrm_flowi_sport(struct flowi *fl)
791 {
792 __be16 port;
793 switch(fl->proto) {
794 case IPPROTO_TCP:
795 case IPPROTO_UDP:
796 case IPPROTO_UDPLITE:
797 case IPPROTO_SCTP:
798 port = fl->fl_ip_sport;
799 break;
800 case IPPROTO_ICMP:
801 case IPPROTO_ICMPV6:
802 port = htons(fl->fl_icmp_type);
803 break;
804 case IPPROTO_MH:
805 port = htons(fl->fl_mh_type);
806 break;
807 default:
808 port = 0; /*XXX*/
809 }
810 return port;
811 }
812
813 static __inline__
814 __be16 xfrm_flowi_dport(struct flowi *fl)
815 {
816 __be16 port;
817 switch(fl->proto) {
818 case IPPROTO_TCP:
819 case IPPROTO_UDP:
820 case IPPROTO_UDPLITE:
821 case IPPROTO_SCTP:
822 port = fl->fl_ip_dport;
823 break;
824 case IPPROTO_ICMP:
825 case IPPROTO_ICMPV6:
826 port = htons(fl->fl_icmp_code);
827 break;
828 default:
829 port = 0; /*XXX*/
830 }
831 return port;
832 }
833
834 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
835 unsigned short family);
836
837 #ifdef CONFIG_SECURITY_NETWORK_XFRM
838 /* If neither has a context --> match
839 * Otherwise, both must have a context and the sids, doi, alg must match
840 */
841 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
842 {
843 return ((!s1 && !s2) ||
844 (s1 && s2 &&
845 (s1->ctx_sid == s2->ctx_sid) &&
846 (s1->ctx_doi == s2->ctx_doi) &&
847 (s1->ctx_alg == s2->ctx_alg)));
848 }
849 #else
850 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
851 {
852 return 1;
853 }
854 #endif
855
856 /* A struct encoding bundle of transformations to apply to some set of flow.
857 *
858 * dst->child points to the next element of bundle.
859 * dst->xfrm points to an instanse of transformer.
860 *
861 * Due to unfortunate limitations of current routing cache, which we
862 * have no time to fix, it mirrors struct rtable and bound to the same
863 * routing key, including saddr,daddr. However, we can have many of
864 * bundles differing by session id. All the bundles grow from a parent
865 * policy rule.
866 */
867 struct xfrm_dst {
868 union {
869 struct dst_entry dst;
870 struct rtable rt;
871 struct rt6_info rt6;
872 } u;
873 struct dst_entry *route;
874 struct flow_cache_object flo;
875 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
876 int num_pols, num_xfrms;
877 #ifdef CONFIG_XFRM_SUB_POLICY
878 struct flowi *origin;
879 struct xfrm_selector *partner;
880 #endif
881 u32 xfrm_genid;
882 u32 policy_genid;
883 u32 route_mtu_cached;
884 u32 child_mtu_cached;
885 u32 route_cookie;
886 u32 path_cookie;
887 };
888
889 #ifdef CONFIG_XFRM
890 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
891 {
892 xfrm_pols_put(xdst->pols, xdst->num_pols);
893 dst_release(xdst->route);
894 if (likely(xdst->u.dst.xfrm))
895 xfrm_state_put(xdst->u.dst.xfrm);
896 #ifdef CONFIG_XFRM_SUB_POLICY
897 kfree(xdst->origin);
898 xdst->origin = NULL;
899 kfree(xdst->partner);
900 xdst->partner = NULL;
901 #endif
902 }
903 #endif
904
905 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
906
907 struct sec_path {
908 atomic_t refcnt;
909 int len;
910 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
911 };
912
913 static inline struct sec_path *
914 secpath_get(struct sec_path *sp)
915 {
916 if (sp)
917 atomic_inc(&sp->refcnt);
918 return sp;
919 }
920
921 extern void __secpath_destroy(struct sec_path *sp);
922
923 static inline void
924 secpath_put(struct sec_path *sp)
925 {
926 if (sp && atomic_dec_and_test(&sp->refcnt))
927 __secpath_destroy(sp);
928 }
929
930 extern struct sec_path *secpath_dup(struct sec_path *src);
931
932 static inline void
933 secpath_reset(struct sk_buff *skb)
934 {
935 #ifdef CONFIG_XFRM
936 secpath_put(skb->sp);
937 skb->sp = NULL;
938 #endif
939 }
940
941 static inline int
942 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
943 {
944 switch (family) {
945 case AF_INET:
946 return addr->a4 == 0;
947 case AF_INET6:
948 return ipv6_addr_any((struct in6_addr *)&addr->a6);
949 }
950 return 0;
951 }
952
953 static inline int
954 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
955 {
956 return (tmpl->saddr.a4 &&
957 tmpl->saddr.a4 != x->props.saddr.a4);
958 }
959
960 static inline int
961 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
962 {
963 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
964 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
965 }
966
967 static inline int
968 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
969 {
970 switch (family) {
971 case AF_INET:
972 return __xfrm4_state_addr_cmp(tmpl, x);
973 case AF_INET6:
974 return __xfrm6_state_addr_cmp(tmpl, x);
975 }
976 return !0;
977 }
978
979 #ifdef CONFIG_XFRM
980 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
981
982 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
983 struct sk_buff *skb,
984 unsigned int family, int reverse)
985 {
986 struct net *net = dev_net(skb->dev);
987 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
988
989 if (sk && sk->sk_policy[XFRM_POLICY_IN])
990 return __xfrm_policy_check(sk, ndir, skb, family);
991
992 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
993 (skb_dst(skb)->flags & DST_NOPOLICY) ||
994 __xfrm_policy_check(sk, ndir, skb, family);
995 }
996
997 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
998 {
999 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1000 }
1001
1002 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1003 {
1004 return xfrm_policy_check(sk, dir, skb, AF_INET);
1005 }
1006
1007 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1008 {
1009 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1010 }
1011
1012 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1013 struct sk_buff *skb)
1014 {
1015 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1016 }
1017
1018 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1019 struct sk_buff *skb)
1020 {
1021 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1022 }
1023
1024 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1025 unsigned int family, int reverse);
1026
1027 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1028 unsigned int family)
1029 {
1030 return __xfrm_decode_session(skb, fl, family, 0);
1031 }
1032
1033 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1034 struct flowi *fl,
1035 unsigned int family)
1036 {
1037 return __xfrm_decode_session(skb, fl, family, 1);
1038 }
1039
1040 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1041
1042 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1043 {
1044 struct net *net = dev_net(skb->dev);
1045
1046 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1047 (skb_dst(skb)->flags & DST_NOXFRM) ||
1048 __xfrm_route_forward(skb, family);
1049 }
1050
1051 static inline int xfrm4_route_forward(struct sk_buff *skb)
1052 {
1053 return xfrm_route_forward(skb, AF_INET);
1054 }
1055
1056 static inline int xfrm6_route_forward(struct sk_buff *skb)
1057 {
1058 return xfrm_route_forward(skb, AF_INET6);
1059 }
1060
1061 extern int __xfrm_sk_clone_policy(struct sock *sk);
1062
1063 static inline int xfrm_sk_clone_policy(struct sock *sk)
1064 {
1065 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1066 return __xfrm_sk_clone_policy(sk);
1067 return 0;
1068 }
1069
1070 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1071
1072 static inline void xfrm_sk_free_policy(struct sock *sk)
1073 {
1074 if (unlikely(sk->sk_policy[0] != NULL)) {
1075 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1076 sk->sk_policy[0] = NULL;
1077 }
1078 if (unlikely(sk->sk_policy[1] != NULL)) {
1079 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1080 sk->sk_policy[1] = NULL;
1081 }
1082 }
1083
1084 #else
1085
1086 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1087 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1088 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1089 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1090 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1091 {
1092 return 1;
1093 }
1094 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1095 {
1096 return 1;
1097 }
1098 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1099 {
1100 return 1;
1101 }
1102 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1103 struct flowi *fl,
1104 unsigned int family)
1105 {
1106 return -ENOSYS;
1107 }
1108 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1109 struct sk_buff *skb)
1110 {
1111 return 1;
1112 }
1113 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1114 struct sk_buff *skb)
1115 {
1116 return 1;
1117 }
1118 #endif
1119
1120 static __inline__
1121 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1122 {
1123 switch (family){
1124 case AF_INET:
1125 return (xfrm_address_t *)&fl->fl4_dst;
1126 case AF_INET6:
1127 return (xfrm_address_t *)&fl->fl6_dst;
1128 }
1129 return NULL;
1130 }
1131
1132 static __inline__
1133 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1134 {
1135 switch (family){
1136 case AF_INET:
1137 return (xfrm_address_t *)&fl->fl4_src;
1138 case AF_INET6:
1139 return (xfrm_address_t *)&fl->fl6_src;
1140 }
1141 return NULL;
1142 }
1143
1144 static __inline__
1145 void xfrm_flowi_addr_get(struct flowi *fl,
1146 xfrm_address_t *saddr, xfrm_address_t *daddr,
1147 unsigned short family)
1148 {
1149 switch(family) {
1150 case AF_INET:
1151 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1152 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1153 break;
1154 case AF_INET6:
1155 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1156 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1157 break;
1158 }
1159 }
1160
1161 static __inline__ int
1162 __xfrm4_state_addr_check(struct xfrm_state *x,
1163 xfrm_address_t *daddr, xfrm_address_t *saddr)
1164 {
1165 if (daddr->a4 == x->id.daddr.a4 &&
1166 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1167 return 1;
1168 return 0;
1169 }
1170
1171 static __inline__ int
1172 __xfrm6_state_addr_check(struct xfrm_state *x,
1173 xfrm_address_t *daddr, xfrm_address_t *saddr)
1174 {
1175 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1176 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1177 ipv6_addr_any((struct in6_addr *)saddr) ||
1178 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1179 return 1;
1180 return 0;
1181 }
1182
1183 static __inline__ int
1184 xfrm_state_addr_check(struct xfrm_state *x,
1185 xfrm_address_t *daddr, xfrm_address_t *saddr,
1186 unsigned short family)
1187 {
1188 switch (family) {
1189 case AF_INET:
1190 return __xfrm4_state_addr_check(x, daddr, saddr);
1191 case AF_INET6:
1192 return __xfrm6_state_addr_check(x, daddr, saddr);
1193 }
1194 return 0;
1195 }
1196
1197 static __inline__ int
1198 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1199 unsigned short family)
1200 {
1201 switch (family) {
1202 case AF_INET:
1203 return __xfrm4_state_addr_check(x,
1204 (xfrm_address_t *)&fl->fl4_dst,
1205 (xfrm_address_t *)&fl->fl4_src);
1206 case AF_INET6:
1207 return __xfrm6_state_addr_check(x,
1208 (xfrm_address_t *)&fl->fl6_dst,
1209 (xfrm_address_t *)&fl->fl6_src);
1210 }
1211 return 0;
1212 }
1213
1214 static inline int xfrm_state_kern(struct xfrm_state *x)
1215 {
1216 return atomic_read(&x->tunnel_users);
1217 }
1218
1219 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1220 {
1221 return (!userproto || proto == userproto ||
1222 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1223 proto == IPPROTO_ESP ||
1224 proto == IPPROTO_COMP)));
1225 }
1226
1227 /*
1228 * xfrm algorithm information
1229 */
1230 struct xfrm_algo_aead_info {
1231 u16 icv_truncbits;
1232 };
1233
1234 struct xfrm_algo_auth_info {
1235 u16 icv_truncbits;
1236 u16 icv_fullbits;
1237 };
1238
1239 struct xfrm_algo_encr_info {
1240 u16 blockbits;
1241 u16 defkeybits;
1242 };
1243
1244 struct xfrm_algo_comp_info {
1245 u16 threshold;
1246 };
1247
1248 struct xfrm_algo_desc {
1249 char *name;
1250 char *compat;
1251 u8 available:1;
1252 union {
1253 struct xfrm_algo_aead_info aead;
1254 struct xfrm_algo_auth_info auth;
1255 struct xfrm_algo_encr_info encr;
1256 struct xfrm_algo_comp_info comp;
1257 } uinfo;
1258 struct sadb_alg desc;
1259 };
1260
1261 /* XFRM tunnel handlers. */
1262 struct xfrm_tunnel {
1263 int (*handler)(struct sk_buff *skb);
1264 int (*err_handler)(struct sk_buff *skb, u32 info);
1265
1266 struct xfrm_tunnel *next;
1267 int priority;
1268 };
1269
1270 struct xfrm6_tunnel {
1271 int (*handler)(struct sk_buff *skb);
1272 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1273 u8 type, u8 code, int offset, __be32 info);
1274 struct xfrm6_tunnel *next;
1275 int priority;
1276 };
1277
1278 extern void xfrm_init(void);
1279 extern void xfrm4_init(int rt_hash_size);
1280 extern int xfrm_state_init(struct net *net);
1281 extern void xfrm_state_fini(struct net *net);
1282 extern void xfrm4_state_init(void);
1283 #ifdef CONFIG_XFRM
1284 extern int xfrm6_init(void);
1285 extern void xfrm6_fini(void);
1286 extern int xfrm6_state_init(void);
1287 extern void xfrm6_state_fini(void);
1288 #else
1289 static inline int xfrm6_init(void)
1290 {
1291 return 0;
1292 }
1293 static inline void xfrm6_fini(void)
1294 {
1295 ;
1296 }
1297 #endif
1298
1299 #ifdef CONFIG_XFRM_STATISTICS
1300 extern int xfrm_proc_init(struct net *net);
1301 extern void xfrm_proc_fini(struct net *net);
1302 #endif
1303
1304 extern int xfrm_sysctl_init(struct net *net);
1305 #ifdef CONFIG_SYSCTL
1306 extern void xfrm_sysctl_fini(struct net *net);
1307 #else
1308 static inline void xfrm_sysctl_fini(struct net *net)
1309 {
1310 }
1311 #endif
1312
1313 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1314 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1315 int (*func)(struct xfrm_state *, int, void*), void *);
1316 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1317 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1318 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1319 struct flowi *fl, struct xfrm_tmpl *tmpl,
1320 struct xfrm_policy *pol, int *err,
1321 unsigned short family);
1322 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1323 xfrm_address_t *daddr,
1324 xfrm_address_t *saddr,
1325 unsigned short family,
1326 u8 mode, u8 proto, u32 reqid);
1327 extern int xfrm_state_check_expire(struct xfrm_state *x);
1328 extern void xfrm_state_insert(struct xfrm_state *x);
1329 extern int xfrm_state_add(struct xfrm_state *x);
1330 extern int xfrm_state_update(struct xfrm_state *x);
1331 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1332 xfrm_address_t *daddr, __be32 spi,
1333 u8 proto, unsigned short family);
1334 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1335 xfrm_address_t *daddr,
1336 xfrm_address_t *saddr,
1337 u8 proto,
1338 unsigned short family);
1339 #ifdef CONFIG_XFRM_SUB_POLICY
1340 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1341 int n, unsigned short family);
1342 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1343 int n, unsigned short family);
1344 #else
1345 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1346 int n, unsigned short family)
1347 {
1348 return -ENOSYS;
1349 }
1350
1351 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1352 int n, unsigned short family)
1353 {
1354 return -ENOSYS;
1355 }
1356 #endif
1357
1358 struct xfrmk_sadinfo {
1359 u32 sadhcnt; /* current hash bkts */
1360 u32 sadhmcnt; /* max allowed hash bkts */
1361 u32 sadcnt; /* current running count */
1362 };
1363
1364 struct xfrmk_spdinfo {
1365 u32 incnt;
1366 u32 outcnt;
1367 u32 fwdcnt;
1368 u32 inscnt;
1369 u32 outscnt;
1370 u32 fwdscnt;
1371 u32 spdhcnt;
1372 u32 spdhmcnt;
1373 };
1374
1375 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1376 u32 seq);
1377 extern int xfrm_state_delete(struct xfrm_state *x);
1378 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1379 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1380 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1381 extern int xfrm_replay_check(struct xfrm_state *x,
1382 struct sk_buff *skb, __be32 seq);
1383 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1384 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1385 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1386 extern int xfrm_init_state(struct xfrm_state *x);
1387 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1388 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1389 int encap_type);
1390 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1391 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1392 extern int xfrm_output(struct sk_buff *skb);
1393 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1394 extern int xfrm4_extract_header(struct sk_buff *skb);
1395 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1396 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1397 int encap_type);
1398 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1399 extern int xfrm4_rcv(struct sk_buff *skb);
1400
1401 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1402 {
1403 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1404 }
1405
1406 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1407 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1408 extern int xfrm4_output(struct sk_buff *skb);
1409 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1410 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1411 extern int xfrm6_extract_header(struct sk_buff *skb);
1412 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1413 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1414 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1415 extern int xfrm6_rcv(struct sk_buff *skb);
1416 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1417 xfrm_address_t *saddr, u8 proto);
1418 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1419 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1420 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1421 extern void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr);
1422 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
1423 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1424 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1425 extern int xfrm6_output(struct sk_buff *skb);
1426 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1427 u8 **prevhdr);
1428
1429 #ifdef CONFIG_XFRM
1430 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1431 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1432 #else
1433 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1434 {
1435 return -ENOPROTOOPT;
1436 }
1437
1438 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1439 {
1440 /* should not happen */
1441 kfree_skb(skb);
1442 return 0;
1443 }
1444 #endif
1445
1446 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1447
1448 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1449 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1450 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1451 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1452 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1453 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1454 u8 type, int dir,
1455 struct xfrm_selector *sel,
1456 struct xfrm_sec_ctx *ctx, int delete,
1457 int *err);
1458 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1459 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1460 u32 xfrm_get_acqseq(void);
1461 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1462 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1463 u8 mode, u32 reqid, u8 proto,
1464 xfrm_address_t *daddr,
1465 xfrm_address_t *saddr, int create,
1466 unsigned short family);
1467 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1468 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1469 struct flowi *fl, int family, int strict);
1470
1471 #ifdef CONFIG_XFRM_MIGRATE
1472 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1473 struct xfrm_migrate *m, int num_bundles,
1474 struct xfrm_kmaddress *k);
1475 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1476 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1477 struct xfrm_migrate *m);
1478 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1479 struct xfrm_migrate *m, int num_bundles,
1480 struct xfrm_kmaddress *k);
1481 #endif
1482
1483 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1484 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1485 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1486
1487 extern void xfrm_input_init(void);
1488 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1489
1490 extern void xfrm_probe_algs(void);
1491 extern int xfrm_count_auth_supported(void);
1492 extern int xfrm_count_enc_supported(void);
1493 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1494 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1495 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1496 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1497 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1498 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1499 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1500 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1501 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1502 int probe);
1503
1504 struct hash_desc;
1505 struct scatterlist;
1506 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1507 unsigned int);
1508
1509 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1510 int family)
1511 {
1512 switch (family) {
1513 default:
1514 case AF_INET:
1515 return (__force u32)a->a4 - (__force u32)b->a4;
1516 case AF_INET6:
1517 return ipv6_addr_cmp((struct in6_addr *)a,
1518 (struct in6_addr *)b);
1519 }
1520 }
1521
1522 static inline int xfrm_policy_id2dir(u32 index)
1523 {
1524 return index & 7;
1525 }
1526
1527 #ifdef CONFIG_XFRM
1528 static inline int xfrm_aevent_is_on(struct net *net)
1529 {
1530 struct sock *nlsk;
1531 int ret = 0;
1532
1533 rcu_read_lock();
1534 nlsk = rcu_dereference(net->xfrm.nlsk);
1535 if (nlsk)
1536 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1537 rcu_read_unlock();
1538 return ret;
1539 }
1540 #endif
1541
1542 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1543 {
1544 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1545 }
1546
1547 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1548 {
1549 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1550 }
1551
1552 #ifdef CONFIG_XFRM_MIGRATE
1553 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1554 {
1555 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1556 }
1557
1558 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1559 {
1560 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1561 }
1562
1563 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1564 {
1565 int i;
1566 for (i = 0; i < n; i++)
1567 xfrm_state_put(*(states + i));
1568 }
1569
1570 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1571 {
1572 int i;
1573 for (i = 0; i < n; i++)
1574 xfrm_state_delete(*(states + i));
1575 }
1576 #endif
1577
1578 #ifdef CONFIG_XFRM
1579 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1580 {
1581 return skb->sp->xvec[skb->sp->len - 1];
1582 }
1583 #endif
1584
1585 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1586 {
1587 if (attrs[XFRMA_MARK])
1588 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(m));
1589 else
1590 m->v = m->m = 0;
1591
1592 return m->v & m->m;
1593 }
1594
1595 static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m)
1596 {
1597 if (m->m | m->v)
1598 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1599 return 0;
1600
1601 nla_put_failure:
1602 return -1;
1603 }
1604
1605 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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