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xfrm: cache bundles instead of policies for outgoing flows
[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 #ifdef CONFIG_XFRM_SUB_POLICY
739 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
740 {
741 int i;
742 for (i = npols - 1; i >= 0; --i)
743 xfrm_pol_put(pols[i]);
744 }
745 #else
746 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
747 {
748 xfrm_pol_put(pols[0]);
749 }
750 #endif
751
752 extern void __xfrm_state_destroy(struct xfrm_state *);
753
754 static inline void __xfrm_state_put(struct xfrm_state *x)
755 {
756 atomic_dec(&x->refcnt);
757 }
758
759 static inline void xfrm_state_put(struct xfrm_state *x)
760 {
761 if (atomic_dec_and_test(&x->refcnt))
762 __xfrm_state_destroy(x);
763 }
764
765 static inline void xfrm_state_hold(struct xfrm_state *x)
766 {
767 atomic_inc(&x->refcnt);
768 }
769
770 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
771 {
772 __be32 *a1 = token1;
773 __be32 *a2 = token2;
774 int pdw;
775 int pbi;
776
777 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
778 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
779
780 if (pdw)
781 if (memcmp(a1, a2, pdw << 2))
782 return 0;
783
784 if (pbi) {
785 __be32 mask;
786
787 mask = htonl((0xffffffff) << (32 - pbi));
788
789 if ((a1[pdw] ^ a2[pdw]) & mask)
790 return 0;
791 }
792
793 return 1;
794 }
795
796 static __inline__
797 __be16 xfrm_flowi_sport(struct flowi *fl)
798 {
799 __be16 port;
800 switch(fl->proto) {
801 case IPPROTO_TCP:
802 case IPPROTO_UDP:
803 case IPPROTO_UDPLITE:
804 case IPPROTO_SCTP:
805 port = fl->fl_ip_sport;
806 break;
807 case IPPROTO_ICMP:
808 case IPPROTO_ICMPV6:
809 port = htons(fl->fl_icmp_type);
810 break;
811 case IPPROTO_MH:
812 port = htons(fl->fl_mh_type);
813 break;
814 default:
815 port = 0; /*XXX*/
816 }
817 return port;
818 }
819
820 static __inline__
821 __be16 xfrm_flowi_dport(struct flowi *fl)
822 {
823 __be16 port;
824 switch(fl->proto) {
825 case IPPROTO_TCP:
826 case IPPROTO_UDP:
827 case IPPROTO_UDPLITE:
828 case IPPROTO_SCTP:
829 port = fl->fl_ip_dport;
830 break;
831 case IPPROTO_ICMP:
832 case IPPROTO_ICMPV6:
833 port = htons(fl->fl_icmp_code);
834 break;
835 default:
836 port = 0; /*XXX*/
837 }
838 return port;
839 }
840
841 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
842 unsigned short family);
843
844 #ifdef CONFIG_SECURITY_NETWORK_XFRM
845 /* If neither has a context --> match
846 * Otherwise, both must have a context and the sids, doi, alg must match
847 */
848 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
849 {
850 return ((!s1 && !s2) ||
851 (s1 && s2 &&
852 (s1->ctx_sid == s2->ctx_sid) &&
853 (s1->ctx_doi == s2->ctx_doi) &&
854 (s1->ctx_alg == s2->ctx_alg)));
855 }
856 #else
857 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
858 {
859 return 1;
860 }
861 #endif
862
863 /* A struct encoding bundle of transformations to apply to some set of flow.
864 *
865 * dst->child points to the next element of bundle.
866 * dst->xfrm points to an instanse of transformer.
867 *
868 * Due to unfortunate limitations of current routing cache, which we
869 * have no time to fix, it mirrors struct rtable and bound to the same
870 * routing key, including saddr,daddr. However, we can have many of
871 * bundles differing by session id. All the bundles grow from a parent
872 * policy rule.
873 */
874 struct xfrm_dst {
875 union {
876 struct dst_entry dst;
877 struct rtable rt;
878 struct rt6_info rt6;
879 } u;
880 struct dst_entry *route;
881 struct flow_cache_object flo;
882 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
883 int num_pols, num_xfrms;
884 #ifdef CONFIG_XFRM_SUB_POLICY
885 struct flowi *origin;
886 struct xfrm_selector *partner;
887 #endif
888 u32 xfrm_genid;
889 u32 policy_genid;
890 u32 route_mtu_cached;
891 u32 child_mtu_cached;
892 u32 route_cookie;
893 u32 path_cookie;
894 };
895
896 #ifdef CONFIG_XFRM
897 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
898 {
899 xfrm_pols_put(xdst->pols, xdst->num_pols);
900 dst_release(xdst->route);
901 if (likely(xdst->u.dst.xfrm))
902 xfrm_state_put(xdst->u.dst.xfrm);
903 #ifdef CONFIG_XFRM_SUB_POLICY
904 kfree(xdst->origin);
905 xdst->origin = NULL;
906 kfree(xdst->partner);
907 xdst->partner = NULL;
908 #endif
909 }
910 #endif
911
912 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
913
914 struct sec_path {
915 atomic_t refcnt;
916 int len;
917 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
918 };
919
920 static inline struct sec_path *
921 secpath_get(struct sec_path *sp)
922 {
923 if (sp)
924 atomic_inc(&sp->refcnt);
925 return sp;
926 }
927
928 extern void __secpath_destroy(struct sec_path *sp);
929
930 static inline void
931 secpath_put(struct sec_path *sp)
932 {
933 if (sp && atomic_dec_and_test(&sp->refcnt))
934 __secpath_destroy(sp);
935 }
936
937 extern struct sec_path *secpath_dup(struct sec_path *src);
938
939 static inline void
940 secpath_reset(struct sk_buff *skb)
941 {
942 #ifdef CONFIG_XFRM
943 secpath_put(skb->sp);
944 skb->sp = NULL;
945 #endif
946 }
947
948 static inline int
949 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
950 {
951 switch (family) {
952 case AF_INET:
953 return addr->a4 == 0;
954 case AF_INET6:
955 return ipv6_addr_any((struct in6_addr *)&addr->a6);
956 }
957 return 0;
958 }
959
960 static inline int
961 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
962 {
963 return (tmpl->saddr.a4 &&
964 tmpl->saddr.a4 != x->props.saddr.a4);
965 }
966
967 static inline int
968 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
969 {
970 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
971 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
972 }
973
974 static inline int
975 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
976 {
977 switch (family) {
978 case AF_INET:
979 return __xfrm4_state_addr_cmp(tmpl, x);
980 case AF_INET6:
981 return __xfrm6_state_addr_cmp(tmpl, x);
982 }
983 return !0;
984 }
985
986 #ifdef CONFIG_XFRM
987 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
988
989 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
990 struct sk_buff *skb,
991 unsigned int family, int reverse)
992 {
993 struct net *net = dev_net(skb->dev);
994 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
995
996 if (sk && sk->sk_policy[XFRM_POLICY_IN])
997 return __xfrm_policy_check(sk, ndir, skb, family);
998
999 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1000 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1001 __xfrm_policy_check(sk, ndir, skb, family);
1002 }
1003
1004 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1005 {
1006 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1007 }
1008
1009 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1010 {
1011 return xfrm_policy_check(sk, dir, skb, AF_INET);
1012 }
1013
1014 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1015 {
1016 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1017 }
1018
1019 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1020 struct sk_buff *skb)
1021 {
1022 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1023 }
1024
1025 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1026 struct sk_buff *skb)
1027 {
1028 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1029 }
1030
1031 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1032 unsigned int family, int reverse);
1033
1034 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1035 unsigned int family)
1036 {
1037 return __xfrm_decode_session(skb, fl, family, 0);
1038 }
1039
1040 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1041 struct flowi *fl,
1042 unsigned int family)
1043 {
1044 return __xfrm_decode_session(skb, fl, family, 1);
1045 }
1046
1047 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1048
1049 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1050 {
1051 struct net *net = dev_net(skb->dev);
1052
1053 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1054 (skb_dst(skb)->flags & DST_NOXFRM) ||
1055 __xfrm_route_forward(skb, family);
1056 }
1057
1058 static inline int xfrm4_route_forward(struct sk_buff *skb)
1059 {
1060 return xfrm_route_forward(skb, AF_INET);
1061 }
1062
1063 static inline int xfrm6_route_forward(struct sk_buff *skb)
1064 {
1065 return xfrm_route_forward(skb, AF_INET6);
1066 }
1067
1068 extern int __xfrm_sk_clone_policy(struct sock *sk);
1069
1070 static inline int xfrm_sk_clone_policy(struct sock *sk)
1071 {
1072 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1073 return __xfrm_sk_clone_policy(sk);
1074 return 0;
1075 }
1076
1077 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1078
1079 static inline void xfrm_sk_free_policy(struct sock *sk)
1080 {
1081 if (unlikely(sk->sk_policy[0] != NULL)) {
1082 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1083 sk->sk_policy[0] = NULL;
1084 }
1085 if (unlikely(sk->sk_policy[1] != NULL)) {
1086 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1087 sk->sk_policy[1] = NULL;
1088 }
1089 }
1090
1091 #else
1092
1093 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1094 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1095 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1096 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1097 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1098 {
1099 return 1;
1100 }
1101 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1102 {
1103 return 1;
1104 }
1105 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1106 {
1107 return 1;
1108 }
1109 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1110 struct flowi *fl,
1111 unsigned int family)
1112 {
1113 return -ENOSYS;
1114 }
1115 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1116 struct sk_buff *skb)
1117 {
1118 return 1;
1119 }
1120 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1121 struct sk_buff *skb)
1122 {
1123 return 1;
1124 }
1125 #endif
1126
1127 static __inline__
1128 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1129 {
1130 switch (family){
1131 case AF_INET:
1132 return (xfrm_address_t *)&fl->fl4_dst;
1133 case AF_INET6:
1134 return (xfrm_address_t *)&fl->fl6_dst;
1135 }
1136 return NULL;
1137 }
1138
1139 static __inline__
1140 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1141 {
1142 switch (family){
1143 case AF_INET:
1144 return (xfrm_address_t *)&fl->fl4_src;
1145 case AF_INET6:
1146 return (xfrm_address_t *)&fl->fl6_src;
1147 }
1148 return NULL;
1149 }
1150
1151 static __inline__
1152 void xfrm_flowi_addr_get(struct flowi *fl,
1153 xfrm_address_t *saddr, xfrm_address_t *daddr,
1154 unsigned short family)
1155 {
1156 switch(family) {
1157 case AF_INET:
1158 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1159 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1160 break;
1161 case AF_INET6:
1162 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1163 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1164 break;
1165 }
1166 }
1167
1168 static __inline__ int
1169 __xfrm4_state_addr_check(struct xfrm_state *x,
1170 xfrm_address_t *daddr, xfrm_address_t *saddr)
1171 {
1172 if (daddr->a4 == x->id.daddr.a4 &&
1173 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1174 return 1;
1175 return 0;
1176 }
1177
1178 static __inline__ int
1179 __xfrm6_state_addr_check(struct xfrm_state *x,
1180 xfrm_address_t *daddr, xfrm_address_t *saddr)
1181 {
1182 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1183 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1184 ipv6_addr_any((struct in6_addr *)saddr) ||
1185 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1186 return 1;
1187 return 0;
1188 }
1189
1190 static __inline__ int
1191 xfrm_state_addr_check(struct xfrm_state *x,
1192 xfrm_address_t *daddr, xfrm_address_t *saddr,
1193 unsigned short family)
1194 {
1195 switch (family) {
1196 case AF_INET:
1197 return __xfrm4_state_addr_check(x, daddr, saddr);
1198 case AF_INET6:
1199 return __xfrm6_state_addr_check(x, daddr, saddr);
1200 }
1201 return 0;
1202 }
1203
1204 static __inline__ int
1205 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1206 unsigned short family)
1207 {
1208 switch (family) {
1209 case AF_INET:
1210 return __xfrm4_state_addr_check(x,
1211 (xfrm_address_t *)&fl->fl4_dst,
1212 (xfrm_address_t *)&fl->fl4_src);
1213 case AF_INET6:
1214 return __xfrm6_state_addr_check(x,
1215 (xfrm_address_t *)&fl->fl6_dst,
1216 (xfrm_address_t *)&fl->fl6_src);
1217 }
1218 return 0;
1219 }
1220
1221 static inline int xfrm_state_kern(struct xfrm_state *x)
1222 {
1223 return atomic_read(&x->tunnel_users);
1224 }
1225
1226 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1227 {
1228 return (!userproto || proto == userproto ||
1229 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1230 proto == IPPROTO_ESP ||
1231 proto == IPPROTO_COMP)));
1232 }
1233
1234 /*
1235 * xfrm algorithm information
1236 */
1237 struct xfrm_algo_aead_info {
1238 u16 icv_truncbits;
1239 };
1240
1241 struct xfrm_algo_auth_info {
1242 u16 icv_truncbits;
1243 u16 icv_fullbits;
1244 };
1245
1246 struct xfrm_algo_encr_info {
1247 u16 blockbits;
1248 u16 defkeybits;
1249 };
1250
1251 struct xfrm_algo_comp_info {
1252 u16 threshold;
1253 };
1254
1255 struct xfrm_algo_desc {
1256 char *name;
1257 char *compat;
1258 u8 available:1;
1259 union {
1260 struct xfrm_algo_aead_info aead;
1261 struct xfrm_algo_auth_info auth;
1262 struct xfrm_algo_encr_info encr;
1263 struct xfrm_algo_comp_info comp;
1264 } uinfo;
1265 struct sadb_alg desc;
1266 };
1267
1268 /* XFRM tunnel handlers. */
1269 struct xfrm_tunnel {
1270 int (*handler)(struct sk_buff *skb);
1271 int (*err_handler)(struct sk_buff *skb, u32 info);
1272
1273 struct xfrm_tunnel *next;
1274 int priority;
1275 };
1276
1277 struct xfrm6_tunnel {
1278 int (*handler)(struct sk_buff *skb);
1279 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1280 u8 type, u8 code, int offset, __be32 info);
1281 struct xfrm6_tunnel *next;
1282 int priority;
1283 };
1284
1285 extern void xfrm_init(void);
1286 extern void xfrm4_init(int rt_hash_size);
1287 extern int xfrm_state_init(struct net *net);
1288 extern void xfrm_state_fini(struct net *net);
1289 extern void xfrm4_state_init(void);
1290 #ifdef CONFIG_XFRM
1291 extern int xfrm6_init(void);
1292 extern void xfrm6_fini(void);
1293 extern int xfrm6_state_init(void);
1294 extern void xfrm6_state_fini(void);
1295 #else
1296 static inline int xfrm6_init(void)
1297 {
1298 return 0;
1299 }
1300 static inline void xfrm6_fini(void)
1301 {
1302 ;
1303 }
1304 #endif
1305
1306 #ifdef CONFIG_XFRM_STATISTICS
1307 extern int xfrm_proc_init(struct net *net);
1308 extern void xfrm_proc_fini(struct net *net);
1309 #endif
1310
1311 extern int xfrm_sysctl_init(struct net *net);
1312 #ifdef CONFIG_SYSCTL
1313 extern void xfrm_sysctl_fini(struct net *net);
1314 #else
1315 static inline void xfrm_sysctl_fini(struct net *net)
1316 {
1317 }
1318 #endif
1319
1320 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1321 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1322 int (*func)(struct xfrm_state *, int, void*), void *);
1323 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1324 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1325 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1326 struct flowi *fl, struct xfrm_tmpl *tmpl,
1327 struct xfrm_policy *pol, int *err,
1328 unsigned short family);
1329 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1330 xfrm_address_t *daddr,
1331 xfrm_address_t *saddr,
1332 unsigned short family,
1333 u8 mode, u8 proto, u32 reqid);
1334 extern int xfrm_state_check_expire(struct xfrm_state *x);
1335 extern void xfrm_state_insert(struct xfrm_state *x);
1336 extern int xfrm_state_add(struct xfrm_state *x);
1337 extern int xfrm_state_update(struct xfrm_state *x);
1338 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1339 xfrm_address_t *daddr, __be32 spi,
1340 u8 proto, unsigned short family);
1341 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1342 xfrm_address_t *daddr,
1343 xfrm_address_t *saddr,
1344 u8 proto,
1345 unsigned short family);
1346 #ifdef CONFIG_XFRM_SUB_POLICY
1347 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1348 int n, unsigned short family);
1349 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1350 int n, unsigned short family);
1351 #else
1352 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1353 int n, unsigned short family)
1354 {
1355 return -ENOSYS;
1356 }
1357
1358 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1359 int n, unsigned short family)
1360 {
1361 return -ENOSYS;
1362 }
1363 #endif
1364
1365 struct xfrmk_sadinfo {
1366 u32 sadhcnt; /* current hash bkts */
1367 u32 sadhmcnt; /* max allowed hash bkts */
1368 u32 sadcnt; /* current running count */
1369 };
1370
1371 struct xfrmk_spdinfo {
1372 u32 incnt;
1373 u32 outcnt;
1374 u32 fwdcnt;
1375 u32 inscnt;
1376 u32 outscnt;
1377 u32 fwdscnt;
1378 u32 spdhcnt;
1379 u32 spdhmcnt;
1380 };
1381
1382 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1383 u32 seq);
1384 extern int xfrm_state_delete(struct xfrm_state *x);
1385 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1386 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1387 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1388 extern int xfrm_replay_check(struct xfrm_state *x,
1389 struct sk_buff *skb, __be32 seq);
1390 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1391 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1392 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1393 extern int xfrm_init_state(struct xfrm_state *x);
1394 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1395 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1396 int encap_type);
1397 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1398 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1399 extern int xfrm_output(struct sk_buff *skb);
1400 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1401 extern int xfrm4_extract_header(struct sk_buff *skb);
1402 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1403 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1404 int encap_type);
1405 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1406 extern int xfrm4_rcv(struct sk_buff *skb);
1407
1408 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1409 {
1410 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1411 }
1412
1413 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1414 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1415 extern int xfrm4_output(struct sk_buff *skb);
1416 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1417 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1418 extern int xfrm6_extract_header(struct sk_buff *skb);
1419 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1420 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1421 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1422 extern int xfrm6_rcv(struct sk_buff *skb);
1423 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1424 xfrm_address_t *saddr, u8 proto);
1425 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1426 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1427 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1428 extern void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr);
1429 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
1430 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1431 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1432 extern int xfrm6_output(struct sk_buff *skb);
1433 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1434 u8 **prevhdr);
1435
1436 #ifdef CONFIG_XFRM
1437 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1438 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1439 #else
1440 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1441 {
1442 return -ENOPROTOOPT;
1443 }
1444
1445 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1446 {
1447 /* should not happen */
1448 kfree_skb(skb);
1449 return 0;
1450 }
1451 #endif
1452
1453 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1454
1455 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1456 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1457 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1458 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1459 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1460 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1461 u8 type, int dir,
1462 struct xfrm_selector *sel,
1463 struct xfrm_sec_ctx *ctx, int delete,
1464 int *err);
1465 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1466 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1467 u32 xfrm_get_acqseq(void);
1468 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1469 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1470 u8 mode, u32 reqid, u8 proto,
1471 xfrm_address_t *daddr,
1472 xfrm_address_t *saddr, int create,
1473 unsigned short family);
1474 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1475 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1476 struct flowi *fl, int family, int strict);
1477
1478 #ifdef CONFIG_XFRM_MIGRATE
1479 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1480 struct xfrm_migrate *m, int num_bundles,
1481 struct xfrm_kmaddress *k);
1482 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1483 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1484 struct xfrm_migrate *m);
1485 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1486 struct xfrm_migrate *m, int num_bundles,
1487 struct xfrm_kmaddress *k);
1488 #endif
1489
1490 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1491 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1492 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1493
1494 extern void xfrm_input_init(void);
1495 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1496
1497 extern void xfrm_probe_algs(void);
1498 extern int xfrm_count_auth_supported(void);
1499 extern int xfrm_count_enc_supported(void);
1500 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1501 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1502 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1503 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1504 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1505 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1506 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1507 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1508 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1509 int probe);
1510
1511 struct hash_desc;
1512 struct scatterlist;
1513 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1514 unsigned int);
1515
1516 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1517 int family)
1518 {
1519 switch (family) {
1520 default:
1521 case AF_INET:
1522 return (__force u32)a->a4 - (__force u32)b->a4;
1523 case AF_INET6:
1524 return ipv6_addr_cmp((struct in6_addr *)a,
1525 (struct in6_addr *)b);
1526 }
1527 }
1528
1529 static inline int xfrm_policy_id2dir(u32 index)
1530 {
1531 return index & 7;
1532 }
1533
1534 #ifdef CONFIG_XFRM
1535 static inline int xfrm_aevent_is_on(struct net *net)
1536 {
1537 struct sock *nlsk;
1538 int ret = 0;
1539
1540 rcu_read_lock();
1541 nlsk = rcu_dereference(net->xfrm.nlsk);
1542 if (nlsk)
1543 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1544 rcu_read_unlock();
1545 return ret;
1546 }
1547 #endif
1548
1549 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1550 {
1551 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1552 }
1553
1554 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1555 {
1556 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1557 }
1558
1559 #ifdef CONFIG_XFRM_MIGRATE
1560 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1561 {
1562 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1563 }
1564
1565 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1566 {
1567 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1568 }
1569
1570 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1571 {
1572 int i;
1573 for (i = 0; i < n; i++)
1574 xfrm_state_put(*(states + i));
1575 }
1576
1577 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1578 {
1579 int i;
1580 for (i = 0; i < n; i++)
1581 xfrm_state_delete(*(states + i));
1582 }
1583 #endif
1584
1585 #ifdef CONFIG_XFRM
1586 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1587 {
1588 return skb->sp->xvec[skb->sp->len - 1];
1589 }
1590 #endif
1591
1592 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1593 {
1594 if (attrs[XFRMA_MARK])
1595 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(m));
1596 else
1597 m->v = m->m = 0;
1598
1599 return m->v & m->m;
1600 }
1601
1602 static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m)
1603 {
1604 if (m->m | m->v)
1605 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1606 return 0;
1607
1608 nla_put_failure:
1609 return -1;
1610 }
1611
1612 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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