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[IPSEC]: Fix catch-22 with algorithm IDs above 31
[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 #ifdef CONFIG_XFRM_STATISTICS
23 #include <net/snmp.h>
24 #endif
25
26 #define XFRM_PROTO_ESP 50
27 #define XFRM_PROTO_AH 51
28 #define XFRM_PROTO_COMP 108
29 #define XFRM_PROTO_IPIP 4
30 #define XFRM_PROTO_IPV6 41
31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
33
34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
39
40 #ifdef CONFIG_XFRM_STATISTICS
41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
45 #else
46 #define XFRM_INC_STATS(field)
47 #define XFRM_INC_STATS_BH(field)
48 #define XFRM_INC_STATS_USER(field)
49 #endif
50
51 extern struct sock *xfrm_nl;
52 extern u32 sysctl_xfrm_aevent_etime;
53 extern u32 sysctl_xfrm_aevent_rseqth;
54 extern int sysctl_xfrm_larval_drop;
55 extern u32 sysctl_xfrm_acq_expires;
56
57 extern struct mutex xfrm_cfg_mutex;
58
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120 /* Full description of state of transformer. */
121 struct xfrm_state
122 {
123 /* Note: bydst is re-used during gc */
124 struct list_head all;
125 struct hlist_node bydst;
126 struct hlist_node bysrc;
127 struct hlist_node byspi;
128
129 atomic_t refcnt;
130 spinlock_t lock;
131
132 struct xfrm_id id;
133 struct xfrm_selector sel;
134
135 u32 genid;
136
137 /* Key manger bits */
138 struct {
139 u8 state;
140 u8 dying;
141 u32 seq;
142 } km;
143
144 /* Parameters of this state. */
145 struct {
146 u32 reqid;
147 u8 mode;
148 u8 replay_window;
149 u8 aalgo, ealgo, calgo;
150 u8 flags;
151 u16 family;
152 xfrm_address_t saddr;
153 int header_len;
154 int trailer_len;
155 } props;
156
157 struct xfrm_lifetime_cfg lft;
158
159 /* Data for transformer */
160 struct xfrm_algo *aalg;
161 struct xfrm_algo *ealg;
162 struct xfrm_algo *calg;
163 struct xfrm_algo_aead *aead;
164
165 /* Data for encapsulator */
166 struct xfrm_encap_tmpl *encap;
167
168 /* Data for care-of address */
169 xfrm_address_t *coaddr;
170
171 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
172 struct xfrm_state *tunnel;
173
174 /* If a tunnel, number of users + 1 */
175 atomic_t tunnel_users;
176
177 /* State for replay detection */
178 struct xfrm_replay_state replay;
179
180 /* Replay detection state at the time we sent the last notification */
181 struct xfrm_replay_state preplay;
182
183 /* internal flag that only holds state for delayed aevent at the
184 * moment
185 */
186 u32 xflags;
187
188 /* Replay detection notification settings */
189 u32 replay_maxage;
190 u32 replay_maxdiff;
191
192 /* Replay detection notification timer */
193 struct timer_list rtimer;
194
195 /* Statistics */
196 struct xfrm_stats stats;
197
198 struct xfrm_lifetime_cur curlft;
199 struct timer_list timer;
200
201 /* Last used time */
202 unsigned long lastused;
203
204 /* Reference to data common to all the instances of this
205 * transformer. */
206 const struct xfrm_type *type;
207 struct xfrm_mode *inner_mode;
208 struct xfrm_mode *inner_mode_iaf;
209 struct xfrm_mode *outer_mode;
210
211 /* Security context */
212 struct xfrm_sec_ctx *security;
213
214 /* Private data of this transformer, format is opaque,
215 * interpreted by xfrm_type methods. */
216 void *data;
217 };
218
219 /* xflags - make enum if more show up */
220 #define XFRM_TIME_DEFER 1
221
222 enum {
223 XFRM_STATE_VOID,
224 XFRM_STATE_ACQ,
225 XFRM_STATE_VALID,
226 XFRM_STATE_ERROR,
227 XFRM_STATE_EXPIRED,
228 XFRM_STATE_DEAD
229 };
230
231 /* callback structure passed from either netlink or pfkey */
232 struct km_event
233 {
234 union {
235 u32 hard;
236 u32 proto;
237 u32 byid;
238 u32 aevent;
239 u32 type;
240 } data;
241
242 u32 seq;
243 u32 pid;
244 u32 event;
245 };
246
247 struct net_device;
248 struct xfrm_type;
249 struct xfrm_dst;
250 struct xfrm_policy_afinfo {
251 unsigned short family;
252 struct dst_ops *dst_ops;
253 void (*garbage_collect)(void);
254 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
255 xfrm_address_t *daddr);
256 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
257 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
258 void (*decode_session)(struct sk_buff *skb,
259 struct flowi *fl,
260 int reverse);
261 int (*get_tos)(struct flowi *fl);
262 int (*init_path)(struct xfrm_dst *path,
263 struct dst_entry *dst,
264 int nfheader_len);
265 int (*fill_dst)(struct xfrm_dst *xdst,
266 struct net_device *dev);
267 };
268
269 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
270 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
271 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
272 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
273
274 struct xfrm_tmpl;
275 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
276 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
277 extern int __xfrm_state_delete(struct xfrm_state *x);
278
279 struct xfrm_state_afinfo {
280 unsigned int family;
281 unsigned int proto;
282 __be16 eth_proto;
283 struct module *owner;
284 const struct xfrm_type *type_map[IPPROTO_MAX];
285 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
286 int (*init_flags)(struct xfrm_state *x);
287 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
288 struct xfrm_tmpl *tmpl,
289 xfrm_address_t *daddr, xfrm_address_t *saddr);
290 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
291 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
292 int (*output)(struct sk_buff *skb);
293 int (*extract_input)(struct xfrm_state *x,
294 struct sk_buff *skb);
295 int (*extract_output)(struct xfrm_state *x,
296 struct sk_buff *skb);
297 int (*transport_finish)(struct sk_buff *skb,
298 int async);
299 };
300
301 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
302 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
303
304 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
305
306 struct xfrm_type
307 {
308 char *description;
309 struct module *owner;
310 __u8 proto;
311 __u8 flags;
312 #define XFRM_TYPE_NON_FRAGMENT 1
313 #define XFRM_TYPE_REPLAY_PROT 2
314 #define XFRM_TYPE_LOCAL_COADDR 4
315 #define XFRM_TYPE_REMOTE_COADDR 8
316
317 int (*init_state)(struct xfrm_state *x);
318 void (*destructor)(struct xfrm_state *);
319 int (*input)(struct xfrm_state *, struct sk_buff *skb);
320 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
321 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
322 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
323 /* Estimate maximal size of result of transformation of a dgram */
324 u32 (*get_mtu)(struct xfrm_state *, int size);
325 };
326
327 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
328 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
329
330 struct xfrm_mode {
331 /*
332 * Remove encapsulation header.
333 *
334 * The IP header will be moved over the top of the encapsulation
335 * header.
336 *
337 * On entry, the transport header shall point to where the IP header
338 * should be and the network header shall be set to where the IP
339 * header currently is. skb->data shall point to the start of the
340 * payload.
341 */
342 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
343
344 /*
345 * This is the actual input entry point.
346 *
347 * For transport mode and equivalent this would be identical to
348 * input2 (which does not need to be set). While tunnel mode
349 * and equivalent would set this to the tunnel encapsulation function
350 * xfrm4_prepare_input that would in turn call input2.
351 */
352 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
353
354 /*
355 * Add encapsulation header.
356 *
357 * On exit, the transport header will be set to the start of the
358 * encapsulation header to be filled in by x->type->output and
359 * the mac header will be set to the nextheader (protocol for
360 * IPv4) field of the extension header directly preceding the
361 * encapsulation header, or in its absence, that of the top IP
362 * header. The value of the network header will always point
363 * to the top IP header while skb->data will point to the payload.
364 */
365 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
366
367 /*
368 * This is the actual output entry point.
369 *
370 * For transport mode and equivalent this would be identical to
371 * output2 (which does not need to be set). While tunnel mode
372 * and equivalent would set this to a tunnel encapsulation function
373 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
374 * call output2.
375 */
376 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
377
378 struct xfrm_state_afinfo *afinfo;
379 struct module *owner;
380 unsigned int encap;
381 int flags;
382 };
383
384 /* Flags for xfrm_mode. */
385 enum {
386 XFRM_MODE_FLAG_TUNNEL = 1,
387 };
388
389 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
390 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
391
392 static inline int xfrm_af2proto(unsigned int family)
393 {
394 switch(family) {
395 case AF_INET:
396 return IPPROTO_IPIP;
397 case AF_INET6:
398 return IPPROTO_IPV6;
399 default:
400 return 0;
401 }
402 }
403
404 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
405 {
406 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
407 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
408 return x->inner_mode;
409 else
410 return x->inner_mode_iaf;
411 }
412
413 struct xfrm_tmpl
414 {
415 /* id in template is interpreted as:
416 * daddr - destination of tunnel, may be zero for transport mode.
417 * spi - zero to acquire spi. Not zero if spi is static, then
418 * daddr must be fixed too.
419 * proto - AH/ESP/IPCOMP
420 */
421 struct xfrm_id id;
422
423 /* Source address of tunnel. Ignored, if it is not a tunnel. */
424 xfrm_address_t saddr;
425
426 unsigned short encap_family;
427
428 __u32 reqid;
429
430 /* Mode: transport, tunnel etc. */
431 __u8 mode;
432
433 /* Sharing mode: unique, this session only, this user only etc. */
434 __u8 share;
435
436 /* May skip this transfomration if no SA is found */
437 __u8 optional;
438
439 /* Skip aalgos/ealgos/calgos checks. */
440 __u8 allalgs;
441
442 /* Bit mask of algos allowed for acquisition */
443 __u32 aalgos;
444 __u32 ealgos;
445 __u32 calgos;
446 };
447
448 #define XFRM_MAX_DEPTH 6
449
450 struct xfrm_policy
451 {
452 struct xfrm_policy *next;
453 struct list_head bytype;
454 struct hlist_node bydst;
455 struct hlist_node byidx;
456
457 /* This lock only affects elements except for entry. */
458 rwlock_t lock;
459 atomic_t refcnt;
460 struct timer_list timer;
461
462 u32 priority;
463 u32 index;
464 struct xfrm_selector selector;
465 struct xfrm_lifetime_cfg lft;
466 struct xfrm_lifetime_cur curlft;
467 struct dst_entry *bundles;
468 u16 family;
469 u8 type;
470 u8 action;
471 u8 flags;
472 u8 dead;
473 u8 xfrm_nr;
474 /* XXX 1 byte hole, try to pack */
475 struct xfrm_sec_ctx *security;
476 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
477 };
478
479 struct xfrm_migrate {
480 xfrm_address_t old_daddr;
481 xfrm_address_t old_saddr;
482 xfrm_address_t new_daddr;
483 xfrm_address_t new_saddr;
484 u8 proto;
485 u8 mode;
486 u16 reserved;
487 u32 reqid;
488 u16 old_family;
489 u16 new_family;
490 };
491
492 #define XFRM_KM_TIMEOUT 30
493 /* which seqno */
494 #define XFRM_REPLAY_SEQ 1
495 #define XFRM_REPLAY_OSEQ 2
496 #define XFRM_REPLAY_SEQ_MASK 3
497 /* what happened */
498 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
499 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
500
501 /* default aevent timeout in units of 100ms */
502 #define XFRM_AE_ETIME 10
503 /* Async Event timer multiplier */
504 #define XFRM_AE_ETH_M 10
505 /* default seq threshold size */
506 #define XFRM_AE_SEQT_SIZE 2
507
508 struct xfrm_mgr
509 {
510 struct list_head list;
511 char *id;
512 int (*notify)(struct xfrm_state *x, struct km_event *c);
513 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
514 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
515 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
516 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
517 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
518 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
519 };
520
521 extern int xfrm_register_km(struct xfrm_mgr *km);
522 extern int xfrm_unregister_km(struct xfrm_mgr *km);
523
524 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
525
526 /*
527 * This structure is used for the duration where packets are being
528 * transformed by IPsec. As soon as the packet leaves IPsec the
529 * area beyond the generic IP part may be overwritten.
530 */
531 struct xfrm_skb_cb {
532 union {
533 struct inet_skb_parm h4;
534 struct inet6_skb_parm h6;
535 } header;
536
537 /* Sequence number for replay protection. */
538 union {
539 u64 output;
540 __be32 input;
541 } seq;
542 };
543
544 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
545
546 /*
547 * This structure is used by the afinfo prepare_input/prepare_output functions
548 * to transmit header information to the mode input/output functions.
549 */
550 struct xfrm_mode_skb_cb {
551 union {
552 struct inet_skb_parm h4;
553 struct inet6_skb_parm h6;
554 } header;
555
556 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
557 __be16 id;
558 __be16 frag_off;
559
560 /* IP header length (excluding options or extension headers). */
561 u8 ihl;
562
563 /* TOS for IPv4, class for IPv6. */
564 u8 tos;
565
566 /* TTL for IPv4, hop limitfor IPv6. */
567 u8 ttl;
568
569 /* Protocol for IPv4, NH for IPv6. */
570 u8 protocol;
571
572 /* Option length for IPv4, zero for IPv6. */
573 u8 optlen;
574
575 /* Used by IPv6 only, zero for IPv4. */
576 u8 flow_lbl[3];
577 };
578
579 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
580
581 /*
582 * This structure is used by the input processing to locate the SPI and
583 * related information.
584 */
585 struct xfrm_spi_skb_cb {
586 union {
587 struct inet_skb_parm h4;
588 struct inet6_skb_parm h6;
589 } header;
590
591 unsigned int daddroff;
592 unsigned int family;
593 };
594
595 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
596
597 /* Audit Information */
598 struct xfrm_audit
599 {
600 u32 loginuid;
601 u32 secid;
602 };
603
604 #ifdef CONFIG_AUDITSYSCALL
605 static inline struct audit_buffer *xfrm_audit_start(const char *op)
606 {
607 struct audit_buffer *audit_buf = NULL;
608
609 if (audit_enabled == 0)
610 return NULL;
611 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
612 AUDIT_MAC_IPSEC_EVENT);
613 if (audit_buf == NULL)
614 return NULL;
615 audit_log_format(audit_buf, "op=%s", op);
616 return audit_buf;
617 }
618
619 static inline void xfrm_audit_helper_usrinfo(u32 auid, u32 secid,
620 struct audit_buffer *audit_buf)
621 {
622 char *secctx;
623 u32 secctx_len;
624
625 audit_log_format(audit_buf, " auid=%u", auid);
626 if (secid != 0 &&
627 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
628 audit_log_format(audit_buf, " subj=%s", secctx);
629 security_release_secctx(secctx, secctx_len);
630 } else
631 audit_log_task_context(audit_buf);
632 }
633
634 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
635 u32 auid, u32 secid);
636 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
637 u32 auid, u32 secid);
638 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
639 u32 auid, u32 secid);
640 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
641 u32 auid, u32 secid);
642 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
643 struct sk_buff *skb);
644 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
645 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
646 __be32 net_spi, __be32 net_seq);
647 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
648 struct sk_buff *skb, u8 proto);
649 #else
650 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
651 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
652 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
653 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
654 #define xfrm_audit_state_replay_overflow(x, s) do { ; } while (0)
655 #define xfrm_audit_state_notfound_simple(s, f) do { ; } while (0)
656 #define xfrm_audit_state_notfound(s, f, sp, sq) do { ; } while (0)
657 #define xfrm_audit_state_icvfail(x, s, p) do { ; } while (0)
658 #endif /* CONFIG_AUDITSYSCALL */
659
660 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
661 {
662 if (likely(policy != NULL))
663 atomic_inc(&policy->refcnt);
664 }
665
666 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
667
668 static inline void xfrm_pol_put(struct xfrm_policy *policy)
669 {
670 if (atomic_dec_and_test(&policy->refcnt))
671 xfrm_policy_destroy(policy);
672 }
673
674 #ifdef CONFIG_XFRM_SUB_POLICY
675 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
676 {
677 int i;
678 for (i = npols - 1; i >= 0; --i)
679 xfrm_pol_put(pols[i]);
680 }
681 #else
682 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
683 {
684 xfrm_pol_put(pols[0]);
685 }
686 #endif
687
688 extern void __xfrm_state_destroy(struct xfrm_state *);
689
690 static inline void __xfrm_state_put(struct xfrm_state *x)
691 {
692 atomic_dec(&x->refcnt);
693 }
694
695 static inline void xfrm_state_put(struct xfrm_state *x)
696 {
697 if (atomic_dec_and_test(&x->refcnt))
698 __xfrm_state_destroy(x);
699 }
700
701 static inline void xfrm_state_hold(struct xfrm_state *x)
702 {
703 atomic_inc(&x->refcnt);
704 }
705
706 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
707 {
708 __be32 *a1 = token1;
709 __be32 *a2 = token2;
710 int pdw;
711 int pbi;
712
713 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
714 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
715
716 if (pdw)
717 if (memcmp(a1, a2, pdw << 2))
718 return 0;
719
720 if (pbi) {
721 __be32 mask;
722
723 mask = htonl((0xffffffff) << (32 - pbi));
724
725 if ((a1[pdw] ^ a2[pdw]) & mask)
726 return 0;
727 }
728
729 return 1;
730 }
731
732 static __inline__
733 __be16 xfrm_flowi_sport(struct flowi *fl)
734 {
735 __be16 port;
736 switch(fl->proto) {
737 case IPPROTO_TCP:
738 case IPPROTO_UDP:
739 case IPPROTO_UDPLITE:
740 case IPPROTO_SCTP:
741 port = fl->fl_ip_sport;
742 break;
743 case IPPROTO_ICMP:
744 case IPPROTO_ICMPV6:
745 port = htons(fl->fl_icmp_type);
746 break;
747 case IPPROTO_MH:
748 port = htons(fl->fl_mh_type);
749 break;
750 default:
751 port = 0; /*XXX*/
752 }
753 return port;
754 }
755
756 static __inline__
757 __be16 xfrm_flowi_dport(struct flowi *fl)
758 {
759 __be16 port;
760 switch(fl->proto) {
761 case IPPROTO_TCP:
762 case IPPROTO_UDP:
763 case IPPROTO_UDPLITE:
764 case IPPROTO_SCTP:
765 port = fl->fl_ip_dport;
766 break;
767 case IPPROTO_ICMP:
768 case IPPROTO_ICMPV6:
769 port = htons(fl->fl_icmp_code);
770 break;
771 default:
772 port = 0; /*XXX*/
773 }
774 return port;
775 }
776
777 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
778 unsigned short family);
779
780 #ifdef CONFIG_SECURITY_NETWORK_XFRM
781 /* If neither has a context --> match
782 * Otherwise, both must have a context and the sids, doi, alg must match
783 */
784 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
785 {
786 return ((!s1 && !s2) ||
787 (s1 && s2 &&
788 (s1->ctx_sid == s2->ctx_sid) &&
789 (s1->ctx_doi == s2->ctx_doi) &&
790 (s1->ctx_alg == s2->ctx_alg)));
791 }
792 #else
793 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
794 {
795 return 1;
796 }
797 #endif
798
799 /* A struct encoding bundle of transformations to apply to some set of flow.
800 *
801 * dst->child points to the next element of bundle.
802 * dst->xfrm points to an instanse of transformer.
803 *
804 * Due to unfortunate limitations of current routing cache, which we
805 * have no time to fix, it mirrors struct rtable and bound to the same
806 * routing key, including saddr,daddr. However, we can have many of
807 * bundles differing by session id. All the bundles grow from a parent
808 * policy rule.
809 */
810 struct xfrm_dst
811 {
812 union {
813 struct dst_entry dst;
814 struct rtable rt;
815 struct rt6_info rt6;
816 } u;
817 struct dst_entry *route;
818 #ifdef CONFIG_XFRM_SUB_POLICY
819 struct flowi *origin;
820 struct xfrm_selector *partner;
821 #endif
822 u32 genid;
823 u32 route_mtu_cached;
824 u32 child_mtu_cached;
825 u32 route_cookie;
826 u32 path_cookie;
827 };
828
829 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
830 {
831 dst_release(xdst->route);
832 if (likely(xdst->u.dst.xfrm))
833 xfrm_state_put(xdst->u.dst.xfrm);
834 #ifdef CONFIG_XFRM_SUB_POLICY
835 kfree(xdst->origin);
836 xdst->origin = NULL;
837 kfree(xdst->partner);
838 xdst->partner = NULL;
839 #endif
840 }
841
842 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
843
844 struct sec_path
845 {
846 atomic_t refcnt;
847 int len;
848 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
849 };
850
851 static inline struct sec_path *
852 secpath_get(struct sec_path *sp)
853 {
854 if (sp)
855 atomic_inc(&sp->refcnt);
856 return sp;
857 }
858
859 extern void __secpath_destroy(struct sec_path *sp);
860
861 static inline void
862 secpath_put(struct sec_path *sp)
863 {
864 if (sp && atomic_dec_and_test(&sp->refcnt))
865 __secpath_destroy(sp);
866 }
867
868 extern struct sec_path *secpath_dup(struct sec_path *src);
869
870 static inline void
871 secpath_reset(struct sk_buff *skb)
872 {
873 #ifdef CONFIG_XFRM
874 secpath_put(skb->sp);
875 skb->sp = NULL;
876 #endif
877 }
878
879 static inline int
880 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
881 {
882 switch (family) {
883 case AF_INET:
884 return addr->a4 == 0;
885 case AF_INET6:
886 return ipv6_addr_any((struct in6_addr *)&addr->a6);
887 }
888 return 0;
889 }
890
891 static inline int
892 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
893 {
894 return (tmpl->saddr.a4 &&
895 tmpl->saddr.a4 != x->props.saddr.a4);
896 }
897
898 static inline int
899 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
900 {
901 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
902 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
903 }
904
905 static inline int
906 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
907 {
908 switch (family) {
909 case AF_INET:
910 return __xfrm4_state_addr_cmp(tmpl, x);
911 case AF_INET6:
912 return __xfrm6_state_addr_cmp(tmpl, x);
913 }
914 return !0;
915 }
916
917 #ifdef CONFIG_XFRM
918 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
919
920 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
921 struct sk_buff *skb,
922 unsigned int family, int reverse)
923 {
924 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
925
926 if (sk && sk->sk_policy[XFRM_POLICY_IN])
927 return __xfrm_policy_check(sk, ndir, skb, family);
928
929 return (!xfrm_policy_count[dir] && !skb->sp) ||
930 (skb->dst->flags & DST_NOPOLICY) ||
931 __xfrm_policy_check(sk, ndir, skb, family);
932 }
933
934 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
935 {
936 return __xfrm_policy_check2(sk, dir, skb, family, 0);
937 }
938
939 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
940 {
941 return xfrm_policy_check(sk, dir, skb, AF_INET);
942 }
943
944 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
945 {
946 return xfrm_policy_check(sk, dir, skb, AF_INET6);
947 }
948
949 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
950 struct sk_buff *skb)
951 {
952 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
953 }
954
955 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
956 struct sk_buff *skb)
957 {
958 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
959 }
960
961 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
962 unsigned int family, int reverse);
963
964 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
965 unsigned int family)
966 {
967 return __xfrm_decode_session(skb, fl, family, 0);
968 }
969
970 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
971 struct flowi *fl,
972 unsigned int family)
973 {
974 return __xfrm_decode_session(skb, fl, family, 1);
975 }
976
977 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
978
979 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
980 {
981 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
982 (skb->dst->flags & DST_NOXFRM) ||
983 __xfrm_route_forward(skb, family);
984 }
985
986 static inline int xfrm4_route_forward(struct sk_buff *skb)
987 {
988 return xfrm_route_forward(skb, AF_INET);
989 }
990
991 static inline int xfrm6_route_forward(struct sk_buff *skb)
992 {
993 return xfrm_route_forward(skb, AF_INET6);
994 }
995
996 extern int __xfrm_sk_clone_policy(struct sock *sk);
997
998 static inline int xfrm_sk_clone_policy(struct sock *sk)
999 {
1000 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1001 return __xfrm_sk_clone_policy(sk);
1002 return 0;
1003 }
1004
1005 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1006
1007 static inline void xfrm_sk_free_policy(struct sock *sk)
1008 {
1009 if (unlikely(sk->sk_policy[0] != NULL)) {
1010 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1011 sk->sk_policy[0] = NULL;
1012 }
1013 if (unlikely(sk->sk_policy[1] != NULL)) {
1014 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1015 sk->sk_policy[1] = NULL;
1016 }
1017 }
1018
1019 #else
1020
1021 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1022 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1023 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1024 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1025 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1026 {
1027 return 1;
1028 }
1029 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1030 {
1031 return 1;
1032 }
1033 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1034 {
1035 return 1;
1036 }
1037 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1038 struct flowi *fl,
1039 unsigned int family)
1040 {
1041 return -ENOSYS;
1042 }
1043 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1044 struct sk_buff *skb)
1045 {
1046 return 1;
1047 }
1048 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1049 struct sk_buff *skb)
1050 {
1051 return 1;
1052 }
1053 #endif
1054
1055 static __inline__
1056 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1057 {
1058 switch (family){
1059 case AF_INET:
1060 return (xfrm_address_t *)&fl->fl4_dst;
1061 case AF_INET6:
1062 return (xfrm_address_t *)&fl->fl6_dst;
1063 }
1064 return NULL;
1065 }
1066
1067 static __inline__
1068 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1069 {
1070 switch (family){
1071 case AF_INET:
1072 return (xfrm_address_t *)&fl->fl4_src;
1073 case AF_INET6:
1074 return (xfrm_address_t *)&fl->fl6_src;
1075 }
1076 return NULL;
1077 }
1078
1079 static __inline__
1080 void xfrm_flowi_addr_get(struct flowi *fl,
1081 xfrm_address_t *saddr, xfrm_address_t *daddr,
1082 unsigned short family)
1083 {
1084 switch(family) {
1085 case AF_INET:
1086 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1087 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1088 break;
1089 case AF_INET6:
1090 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1091 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1092 break;
1093 }
1094 }
1095
1096 static __inline__ int
1097 __xfrm4_state_addr_check(struct xfrm_state *x,
1098 xfrm_address_t *daddr, xfrm_address_t *saddr)
1099 {
1100 if (daddr->a4 == x->id.daddr.a4 &&
1101 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1102 return 1;
1103 return 0;
1104 }
1105
1106 static __inline__ int
1107 __xfrm6_state_addr_check(struct xfrm_state *x,
1108 xfrm_address_t *daddr, xfrm_address_t *saddr)
1109 {
1110 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1111 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1112 ipv6_addr_any((struct in6_addr *)saddr) ||
1113 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1114 return 1;
1115 return 0;
1116 }
1117
1118 static __inline__ int
1119 xfrm_state_addr_check(struct xfrm_state *x,
1120 xfrm_address_t *daddr, xfrm_address_t *saddr,
1121 unsigned short family)
1122 {
1123 switch (family) {
1124 case AF_INET:
1125 return __xfrm4_state_addr_check(x, daddr, saddr);
1126 case AF_INET6:
1127 return __xfrm6_state_addr_check(x, daddr, saddr);
1128 }
1129 return 0;
1130 }
1131
1132 static __inline__ int
1133 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1134 unsigned short family)
1135 {
1136 switch (family) {
1137 case AF_INET:
1138 return __xfrm4_state_addr_check(x,
1139 (xfrm_address_t *)&fl->fl4_dst,
1140 (xfrm_address_t *)&fl->fl4_src);
1141 case AF_INET6:
1142 return __xfrm6_state_addr_check(x,
1143 (xfrm_address_t *)&fl->fl6_dst,
1144 (xfrm_address_t *)&fl->fl6_src);
1145 }
1146 return 0;
1147 }
1148
1149 static inline int xfrm_state_kern(struct xfrm_state *x)
1150 {
1151 return atomic_read(&x->tunnel_users);
1152 }
1153
1154 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1155 {
1156 return (!userproto || proto == userproto ||
1157 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1158 proto == IPPROTO_ESP ||
1159 proto == IPPROTO_COMP)));
1160 }
1161
1162 /*
1163 * xfrm algorithm information
1164 */
1165 struct xfrm_algo_aead_info {
1166 u16 icv_truncbits;
1167 };
1168
1169 struct xfrm_algo_auth_info {
1170 u16 icv_truncbits;
1171 u16 icv_fullbits;
1172 };
1173
1174 struct xfrm_algo_encr_info {
1175 u16 blockbits;
1176 u16 defkeybits;
1177 };
1178
1179 struct xfrm_algo_comp_info {
1180 u16 threshold;
1181 };
1182
1183 struct xfrm_algo_desc {
1184 char *name;
1185 char *compat;
1186 u8 available:1;
1187 union {
1188 struct xfrm_algo_aead_info aead;
1189 struct xfrm_algo_auth_info auth;
1190 struct xfrm_algo_encr_info encr;
1191 struct xfrm_algo_comp_info comp;
1192 } uinfo;
1193 struct sadb_alg desc;
1194 };
1195
1196 /* XFRM tunnel handlers. */
1197 struct xfrm_tunnel {
1198 int (*handler)(struct sk_buff *skb);
1199 int (*err_handler)(struct sk_buff *skb, __u32 info);
1200
1201 struct xfrm_tunnel *next;
1202 int priority;
1203 };
1204
1205 struct xfrm6_tunnel {
1206 int (*handler)(struct sk_buff *skb);
1207 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1208 int type, int code, int offset, __be32 info);
1209 struct xfrm6_tunnel *next;
1210 int priority;
1211 };
1212
1213 struct xfrm_state_walk {
1214 struct xfrm_state *state;
1215 int count;
1216 u8 proto;
1217 };
1218
1219 struct xfrm_policy_walk {
1220 struct xfrm_policy *policy;
1221 int count;
1222 u8 type, cur_type;
1223 };
1224
1225 extern void xfrm_init(void);
1226 extern void xfrm4_init(void);
1227 extern void xfrm_state_init(void);
1228 extern void xfrm4_state_init(void);
1229 #ifdef CONFIG_XFRM
1230 extern int xfrm6_init(void);
1231 extern void xfrm6_fini(void);
1232 extern int xfrm6_state_init(void);
1233 extern void xfrm6_state_fini(void);
1234 #else
1235 static inline int xfrm6_init(void)
1236 {
1237 return 0;
1238 }
1239 static inline void xfrm6_fini(void)
1240 {
1241 ;
1242 }
1243 #endif
1244
1245 #ifdef CONFIG_XFRM_STATISTICS
1246 extern int xfrm_proc_init(void);
1247 #endif
1248
1249 static inline void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1250 {
1251 walk->proto = proto;
1252 walk->state = NULL;
1253 walk->count = 0;
1254 }
1255
1256 static inline void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1257 {
1258 if (walk->state != NULL) {
1259 xfrm_state_put(walk->state);
1260 walk->state = NULL;
1261 }
1262 }
1263
1264 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1265 int (*func)(struct xfrm_state *, int, void*), void *);
1266 extern struct xfrm_state *xfrm_state_alloc(void);
1267 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1268 struct flowi *fl, struct xfrm_tmpl *tmpl,
1269 struct xfrm_policy *pol, int *err,
1270 unsigned short family);
1271 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1272 xfrm_address_t *saddr,
1273 unsigned short family,
1274 u8 mode, u8 proto, u32 reqid);
1275 extern int xfrm_state_check_expire(struct xfrm_state *x);
1276 extern void xfrm_state_insert(struct xfrm_state *x);
1277 extern int xfrm_state_add(struct xfrm_state *x);
1278 extern int xfrm_state_update(struct xfrm_state *x);
1279 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1280 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1281 #ifdef CONFIG_XFRM_SUB_POLICY
1282 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1283 int n, unsigned short family);
1284 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1285 int n, unsigned short family);
1286 #else
1287 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1288 int n, unsigned short family)
1289 {
1290 return -ENOSYS;
1291 }
1292
1293 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1294 int n, unsigned short family)
1295 {
1296 return -ENOSYS;
1297 }
1298 #endif
1299
1300 struct xfrmk_sadinfo {
1301 u32 sadhcnt; /* current hash bkts */
1302 u32 sadhmcnt; /* max allowed hash bkts */
1303 u32 sadcnt; /* current running count */
1304 };
1305
1306 struct xfrmk_spdinfo {
1307 u32 incnt;
1308 u32 outcnt;
1309 u32 fwdcnt;
1310 u32 inscnt;
1311 u32 outscnt;
1312 u32 fwdscnt;
1313 u32 spdhcnt;
1314 u32 spdhmcnt;
1315 };
1316
1317 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1318 extern int xfrm_state_delete(struct xfrm_state *x);
1319 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1320 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1321 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1322 extern int xfrm_replay_check(struct xfrm_state *x,
1323 struct sk_buff *skb, __be32 seq);
1324 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1325 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1326 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1327 extern int xfrm_init_state(struct xfrm_state *x);
1328 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1329 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1330 int encap_type);
1331 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1332 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1333 extern int xfrm_output(struct sk_buff *skb);
1334 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1335 extern int xfrm4_extract_header(struct sk_buff *skb);
1336 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1337 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1338 int encap_type);
1339 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1340 extern int xfrm4_rcv(struct sk_buff *skb);
1341
1342 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1343 {
1344 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1345 }
1346
1347 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1348 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1349 extern int xfrm4_output(struct sk_buff *skb);
1350 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1351 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1352 extern int xfrm6_extract_header(struct sk_buff *skb);
1353 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1354 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1355 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1356 extern int xfrm6_rcv(struct sk_buff *skb);
1357 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1358 xfrm_address_t *saddr, u8 proto);
1359 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1360 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1361 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1362 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1363 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1364 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1365 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1366 extern int xfrm6_output(struct sk_buff *skb);
1367 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1368 u8 **prevhdr);
1369
1370 #ifdef CONFIG_XFRM
1371 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1372 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1373 #else
1374 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1375 {
1376 return -ENOPROTOOPT;
1377 }
1378
1379 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1380 {
1381 /* should not happen */
1382 kfree_skb(skb);
1383 return 0;
1384 }
1385 #endif
1386
1387 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1388
1389 static inline void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1390 {
1391 walk->cur_type = XFRM_POLICY_TYPE_MAIN;
1392 walk->type = type;
1393 walk->policy = NULL;
1394 walk->count = 0;
1395 }
1396
1397 static inline void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
1398 {
1399 if (walk->policy != NULL) {
1400 xfrm_pol_put(walk->policy);
1401 walk->policy = NULL;
1402 }
1403 }
1404
1405 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1406 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1407 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1408 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1409 struct xfrm_selector *sel,
1410 struct xfrm_sec_ctx *ctx, int delete,
1411 int *err);
1412 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1413 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1414 u32 xfrm_get_acqseq(void);
1415 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1416 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1417 xfrm_address_t *daddr, xfrm_address_t *saddr,
1418 int create, unsigned short family);
1419 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1420 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1421 struct flowi *fl, int family, int strict);
1422
1423 #ifdef CONFIG_XFRM_MIGRATE
1424 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1425 struct xfrm_migrate *m, int num_bundles);
1426 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1427 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1428 struct xfrm_migrate *m);
1429 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1430 struct xfrm_migrate *m, int num_bundles);
1431 #endif
1432
1433 extern wait_queue_head_t km_waitq;
1434 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1435 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1436 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1437
1438 extern void xfrm_input_init(void);
1439 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1440
1441 extern void xfrm_probe_algs(void);
1442 extern int xfrm_count_auth_supported(void);
1443 extern int xfrm_count_enc_supported(void);
1444 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1445 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1446 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1447 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1448 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1449 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1450 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1451 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1452 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1453 int probe);
1454
1455 struct hash_desc;
1456 struct scatterlist;
1457 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1458 unsigned int);
1459
1460 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1461 int offset, int len, icv_update_fn_t icv_update);
1462
1463 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1464 int family)
1465 {
1466 switch (family) {
1467 default:
1468 case AF_INET:
1469 return (__force __u32)a->a4 - (__force __u32)b->a4;
1470 case AF_INET6:
1471 return ipv6_addr_cmp((struct in6_addr *)a,
1472 (struct in6_addr *)b);
1473 }
1474 }
1475
1476 static inline int xfrm_policy_id2dir(u32 index)
1477 {
1478 return index & 7;
1479 }
1480
1481 static inline int xfrm_aevent_is_on(void)
1482 {
1483 struct sock *nlsk;
1484 int ret = 0;
1485
1486 rcu_read_lock();
1487 nlsk = rcu_dereference(xfrm_nl);
1488 if (nlsk)
1489 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1490 rcu_read_unlock();
1491 return ret;
1492 }
1493
1494 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1495 {
1496 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1497 }
1498
1499 #ifdef CONFIG_XFRM_MIGRATE
1500 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1501 {
1502 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1503 }
1504
1505 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1506 {
1507 int i;
1508 for (i = 0; i < n; i++)
1509 xfrm_state_put(*(states + i));
1510 }
1511
1512 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1513 {
1514 int i;
1515 for (i = 0; i < n; i++)
1516 xfrm_state_delete(*(states + i));
1517 }
1518 #endif
1519
1520 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1521 {
1522 return skb->sp->xvec[skb->sp->len - 1];
1523 }
1524
1525 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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