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[deliverable/linux.git] / include / net / xfrm.h
1 #ifndef _NET_XFRM_H
2 #define _NET_XFRM_H
3
4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
15 #include <linux/slab.h>
16
17 #include <net/sock.h>
18 #include <net/dst.h>
19 #include <net/ip.h>
20 #include <net/route.h>
21 #include <net/ipv6.h>
22 #include <net/ip6_fib.h>
23 #include <net/flow.h>
24
25 #include <linux/interrupt.h>
26
27 #ifdef CONFIG_XFRM_STATISTICS
28 #include <net/snmp.h>
29 #endif
30
31 #define XFRM_PROTO_ESP 50
32 #define XFRM_PROTO_AH 51
33 #define XFRM_PROTO_COMP 108
34 #define XFRM_PROTO_IPIP 4
35 #define XFRM_PROTO_IPV6 41
36 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46 #ifdef CONFIG_XFRM_STATISTICS
47 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50 #else
51 #define XFRM_INC_STATS(net, field) ((void)(net))
52 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
53 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
54 #endif
55
56 extern struct mutex xfrm_cfg_mutex;
57
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119 struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 union {
123 u8 dying;
124 u8 proto;
125 };
126 u32 seq;
127 };
128
129 /* Full description of state of transformer. */
130 struct xfrm_state {
131 #ifdef CONFIG_NET_NS
132 struct net *xs_net;
133 #endif
134 union {
135 struct hlist_node gclist;
136 struct hlist_node bydst;
137 };
138 struct hlist_node bysrc;
139 struct hlist_node byspi;
140
141 atomic_t refcnt;
142 spinlock_t lock;
143
144 struct xfrm_id id;
145 struct xfrm_selector sel;
146 struct xfrm_mark mark;
147 u32 tfcpad;
148
149 u32 genid;
150
151 /* Key manager bits */
152 struct xfrm_state_walk km;
153
154 /* Parameters of this state. */
155 struct {
156 u32 reqid;
157 u8 mode;
158 u8 replay_window;
159 u8 aalgo, ealgo, calgo;
160 u8 flags;
161 u16 family;
162 xfrm_address_t saddr;
163 int header_len;
164 int trailer_len;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo_auth *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189
190 /* Replay detection state at the time we sent the last notification */
191 struct xfrm_replay_state preplay;
192
193 /* internal flag that only holds state for delayed aevent at the
194 * moment
195 */
196 u32 xflags;
197
198 /* Replay detection notification settings */
199 u32 replay_maxage;
200 u32 replay_maxdiff;
201
202 /* Replay detection notification timer */
203 struct timer_list rtimer;
204
205 /* Statistics */
206 struct xfrm_stats stats;
207
208 struct xfrm_lifetime_cur curlft;
209 struct tasklet_hrtimer mtimer;
210
211 /* Last used time */
212 unsigned long lastused;
213
214 /* Reference to data common to all the instances of this
215 * transformer. */
216 const struct xfrm_type *type;
217 struct xfrm_mode *inner_mode;
218 struct xfrm_mode *inner_mode_iaf;
219 struct xfrm_mode *outer_mode;
220
221 /* Security context */
222 struct xfrm_sec_ctx *security;
223
224 /* Private data of this transformer, format is opaque,
225 * interpreted by xfrm_type methods. */
226 void *data;
227 };
228
229 static inline struct net *xs_net(struct xfrm_state *x)
230 {
231 return read_pnet(&x->xs_net);
232 }
233
234 /* xflags - make enum if more show up */
235 #define XFRM_TIME_DEFER 1
236
237 enum {
238 XFRM_STATE_VOID,
239 XFRM_STATE_ACQ,
240 XFRM_STATE_VALID,
241 XFRM_STATE_ERROR,
242 XFRM_STATE_EXPIRED,
243 XFRM_STATE_DEAD
244 };
245
246 /* callback structure passed from either netlink or pfkey */
247 struct km_event {
248 union {
249 u32 hard;
250 u32 proto;
251 u32 byid;
252 u32 aevent;
253 u32 type;
254 } data;
255
256 u32 seq;
257 u32 pid;
258 u32 event;
259 struct net *net;
260 };
261
262 struct net_device;
263 struct xfrm_type;
264 struct xfrm_dst;
265 struct xfrm_policy_afinfo {
266 unsigned short family;
267 struct dst_ops *dst_ops;
268 void (*garbage_collect)(struct net *net);
269 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
270 xfrm_address_t *saddr,
271 xfrm_address_t *daddr);
272 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
273 void (*decode_session)(struct sk_buff *skb,
274 struct flowi *fl,
275 int reverse);
276 int (*get_tos)(const struct flowi *fl);
277 int (*init_path)(struct xfrm_dst *path,
278 struct dst_entry *dst,
279 int nfheader_len);
280 int (*fill_dst)(struct xfrm_dst *xdst,
281 struct net_device *dev,
282 const struct flowi *fl);
283 };
284
285 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
286 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
287 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
288 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
289
290 struct xfrm_tmpl;
291 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
292 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
293 extern int __xfrm_state_delete(struct xfrm_state *x);
294
295 struct xfrm_state_afinfo {
296 unsigned int family;
297 unsigned int proto;
298 __be16 eth_proto;
299 struct module *owner;
300 const struct xfrm_type *type_map[IPPROTO_MAX];
301 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
302 int (*init_flags)(struct xfrm_state *x);
303 void (*init_tempsel)(struct xfrm_selector *sel,
304 const struct flowi *fl);
305 void (*init_temprop)(struct xfrm_state *x,
306 const struct xfrm_tmpl *tmpl,
307 const xfrm_address_t *daddr,
308 const xfrm_address_t *saddr);
309 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
310 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
311 int (*output)(struct sk_buff *skb);
312 int (*extract_input)(struct xfrm_state *x,
313 struct sk_buff *skb);
314 int (*extract_output)(struct xfrm_state *x,
315 struct sk_buff *skb);
316 int (*transport_finish)(struct sk_buff *skb,
317 int async);
318 };
319
320 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
321 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
322
323 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
324
325 struct xfrm_type {
326 char *description;
327 struct module *owner;
328 u8 proto;
329 u8 flags;
330 #define XFRM_TYPE_NON_FRAGMENT 1
331 #define XFRM_TYPE_REPLAY_PROT 2
332 #define XFRM_TYPE_LOCAL_COADDR 4
333 #define XFRM_TYPE_REMOTE_COADDR 8
334
335 int (*init_state)(struct xfrm_state *x);
336 void (*destructor)(struct xfrm_state *);
337 int (*input)(struct xfrm_state *, struct sk_buff *skb);
338 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
339 int (*reject)(struct xfrm_state *, struct sk_buff *,
340 const struct flowi *);
341 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
342 /* Estimate maximal size of result of transformation of a dgram */
343 u32 (*get_mtu)(struct xfrm_state *, int size);
344 };
345
346 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
347 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
348
349 struct xfrm_mode {
350 /*
351 * Remove encapsulation header.
352 *
353 * The IP header will be moved over the top of the encapsulation
354 * header.
355 *
356 * On entry, the transport header shall point to where the IP header
357 * should be and the network header shall be set to where the IP
358 * header currently is. skb->data shall point to the start of the
359 * payload.
360 */
361 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
362
363 /*
364 * This is the actual input entry point.
365 *
366 * For transport mode and equivalent this would be identical to
367 * input2 (which does not need to be set). While tunnel mode
368 * and equivalent would set this to the tunnel encapsulation function
369 * xfrm4_prepare_input that would in turn call input2.
370 */
371 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
372
373 /*
374 * Add encapsulation header.
375 *
376 * On exit, the transport header will be set to the start of the
377 * encapsulation header to be filled in by x->type->output and
378 * the mac header will be set to the nextheader (protocol for
379 * IPv4) field of the extension header directly preceding the
380 * encapsulation header, or in its absence, that of the top IP
381 * header. The value of the network header will always point
382 * to the top IP header while skb->data will point to the payload.
383 */
384 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
385
386 /*
387 * This is the actual output entry point.
388 *
389 * For transport mode and equivalent this would be identical to
390 * output2 (which does not need to be set). While tunnel mode
391 * and equivalent would set this to a tunnel encapsulation function
392 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
393 * call output2.
394 */
395 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
396
397 struct xfrm_state_afinfo *afinfo;
398 struct module *owner;
399 unsigned int encap;
400 int flags;
401 };
402
403 /* Flags for xfrm_mode. */
404 enum {
405 XFRM_MODE_FLAG_TUNNEL = 1,
406 };
407
408 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
409 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
410
411 static inline int xfrm_af2proto(unsigned int family)
412 {
413 switch(family) {
414 case AF_INET:
415 return IPPROTO_IPIP;
416 case AF_INET6:
417 return IPPROTO_IPV6;
418 default:
419 return 0;
420 }
421 }
422
423 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
424 {
425 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
426 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
427 return x->inner_mode;
428 else
429 return x->inner_mode_iaf;
430 }
431
432 struct xfrm_tmpl {
433 /* id in template is interpreted as:
434 * daddr - destination of tunnel, may be zero for transport mode.
435 * spi - zero to acquire spi. Not zero if spi is static, then
436 * daddr must be fixed too.
437 * proto - AH/ESP/IPCOMP
438 */
439 struct xfrm_id id;
440
441 /* Source address of tunnel. Ignored, if it is not a tunnel. */
442 xfrm_address_t saddr;
443
444 unsigned short encap_family;
445
446 u32 reqid;
447
448 /* Mode: transport, tunnel etc. */
449 u8 mode;
450
451 /* Sharing mode: unique, this session only, this user only etc. */
452 u8 share;
453
454 /* May skip this transfomration if no SA is found */
455 u8 optional;
456
457 /* Skip aalgos/ealgos/calgos checks. */
458 u8 allalgs;
459
460 /* Bit mask of algos allowed for acquisition */
461 u32 aalgos;
462 u32 ealgos;
463 u32 calgos;
464 };
465
466 #define XFRM_MAX_DEPTH 6
467
468 struct xfrm_policy_walk_entry {
469 struct list_head all;
470 u8 dead;
471 };
472
473 struct xfrm_policy_walk {
474 struct xfrm_policy_walk_entry walk;
475 u8 type;
476 u32 seq;
477 };
478
479 struct xfrm_policy {
480 #ifdef CONFIG_NET_NS
481 struct net *xp_net;
482 #endif
483 struct hlist_node bydst;
484 struct hlist_node byidx;
485
486 /* This lock only affects elements except for entry. */
487 rwlock_t lock;
488 atomic_t refcnt;
489 struct timer_list timer;
490
491 struct flow_cache_object flo;
492 atomic_t genid;
493 u32 priority;
494 u32 index;
495 struct xfrm_mark mark;
496 struct xfrm_selector selector;
497 struct xfrm_lifetime_cfg lft;
498 struct xfrm_lifetime_cur curlft;
499 struct xfrm_policy_walk_entry walk;
500 u8 type;
501 u8 action;
502 u8 flags;
503 u8 xfrm_nr;
504 u16 family;
505 struct xfrm_sec_ctx *security;
506 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
507 };
508
509 static inline struct net *xp_net(struct xfrm_policy *xp)
510 {
511 return read_pnet(&xp->xp_net);
512 }
513
514 struct xfrm_kmaddress {
515 xfrm_address_t local;
516 xfrm_address_t remote;
517 u32 reserved;
518 u16 family;
519 };
520
521 struct xfrm_migrate {
522 xfrm_address_t old_daddr;
523 xfrm_address_t old_saddr;
524 xfrm_address_t new_daddr;
525 xfrm_address_t new_saddr;
526 u8 proto;
527 u8 mode;
528 u16 reserved;
529 u32 reqid;
530 u16 old_family;
531 u16 new_family;
532 };
533
534 #define XFRM_KM_TIMEOUT 30
535 /* which seqno */
536 #define XFRM_REPLAY_SEQ 1
537 #define XFRM_REPLAY_OSEQ 2
538 #define XFRM_REPLAY_SEQ_MASK 3
539 /* what happened */
540 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
541 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
542
543 /* default aevent timeout in units of 100ms */
544 #define XFRM_AE_ETIME 10
545 /* Async Event timer multiplier */
546 #define XFRM_AE_ETH_M 10
547 /* default seq threshold size */
548 #define XFRM_AE_SEQT_SIZE 2
549
550 struct xfrm_mgr {
551 struct list_head list;
552 char *id;
553 int (*notify)(struct xfrm_state *x, const struct km_event *c);
554 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
555 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
556 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
557 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
558 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
559 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
560 };
561
562 extern int xfrm_register_km(struct xfrm_mgr *km);
563 extern int xfrm_unregister_km(struct xfrm_mgr *km);
564
565 /*
566 * This structure is used for the duration where packets are being
567 * transformed by IPsec. As soon as the packet leaves IPsec the
568 * area beyond the generic IP part may be overwritten.
569 */
570 struct xfrm_skb_cb {
571 union {
572 struct inet_skb_parm h4;
573 struct inet6_skb_parm h6;
574 } header;
575
576 /* Sequence number for replay protection. */
577 union {
578 u64 output;
579 __be32 input;
580 } seq;
581 };
582
583 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
584
585 /*
586 * This structure is used by the afinfo prepare_input/prepare_output functions
587 * to transmit header information to the mode input/output functions.
588 */
589 struct xfrm_mode_skb_cb {
590 union {
591 struct inet_skb_parm h4;
592 struct inet6_skb_parm h6;
593 } header;
594
595 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
596 __be16 id;
597 __be16 frag_off;
598
599 /* IP header length (excluding options or extension headers). */
600 u8 ihl;
601
602 /* TOS for IPv4, class for IPv6. */
603 u8 tos;
604
605 /* TTL for IPv4, hop limitfor IPv6. */
606 u8 ttl;
607
608 /* Protocol for IPv4, NH for IPv6. */
609 u8 protocol;
610
611 /* Option length for IPv4, zero for IPv6. */
612 u8 optlen;
613
614 /* Used by IPv6 only, zero for IPv4. */
615 u8 flow_lbl[3];
616 };
617
618 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
619
620 /*
621 * This structure is used by the input processing to locate the SPI and
622 * related information.
623 */
624 struct xfrm_spi_skb_cb {
625 union {
626 struct inet_skb_parm h4;
627 struct inet6_skb_parm h6;
628 } header;
629
630 unsigned int daddroff;
631 unsigned int family;
632 };
633
634 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
635
636 /* Audit Information */
637 struct xfrm_audit {
638 u32 secid;
639 uid_t loginuid;
640 u32 sessionid;
641 };
642
643 #ifdef CONFIG_AUDITSYSCALL
644 static inline struct audit_buffer *xfrm_audit_start(const char *op)
645 {
646 struct audit_buffer *audit_buf = NULL;
647
648 if (audit_enabled == 0)
649 return NULL;
650 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
651 AUDIT_MAC_IPSEC_EVENT);
652 if (audit_buf == NULL)
653 return NULL;
654 audit_log_format(audit_buf, "op=%s", op);
655 return audit_buf;
656 }
657
658 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
659 struct audit_buffer *audit_buf)
660 {
661 char *secctx;
662 u32 secctx_len;
663
664 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
665 if (secid != 0 &&
666 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
667 audit_log_format(audit_buf, " subj=%s", secctx);
668 security_release_secctx(secctx, secctx_len);
669 } else
670 audit_log_task_context(audit_buf);
671 }
672
673 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
674 u32 auid, u32 ses, u32 secid);
675 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
676 u32 auid, u32 ses, u32 secid);
677 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
678 u32 auid, u32 ses, u32 secid);
679 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
680 u32 auid, u32 ses, u32 secid);
681 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
682 struct sk_buff *skb);
683 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
684 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
685 __be32 net_spi, __be32 net_seq);
686 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
687 struct sk_buff *skb, u8 proto);
688 #else
689
690 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
691 u32 auid, u32 ses, u32 secid)
692 {
693 }
694
695 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
696 u32 auid, u32 ses, u32 secid)
697 {
698 }
699
700 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
701 u32 auid, u32 ses, u32 secid)
702 {
703 }
704
705 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
706 u32 auid, u32 ses, u32 secid)
707 {
708 }
709
710 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
711 struct sk_buff *skb)
712 {
713 }
714
715 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
716 u16 family)
717 {
718 }
719
720 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
721 __be32 net_spi, __be32 net_seq)
722 {
723 }
724
725 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
726 struct sk_buff *skb, u8 proto)
727 {
728 }
729 #endif /* CONFIG_AUDITSYSCALL */
730
731 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
732 {
733 if (likely(policy != NULL))
734 atomic_inc(&policy->refcnt);
735 }
736
737 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
738
739 static inline void xfrm_pol_put(struct xfrm_policy *policy)
740 {
741 if (atomic_dec_and_test(&policy->refcnt))
742 xfrm_policy_destroy(policy);
743 }
744
745 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
746 {
747 int i;
748 for (i = npols - 1; i >= 0; --i)
749 xfrm_pol_put(pols[i]);
750 }
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 bool addr_match(const void *token1, const void *token2,
771 int prefixlen)
772 {
773 const __be32 *a1 = token1;
774 const __be32 *a2 = token2;
775 int pdw;
776 int pbi;
777
778 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
779 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
780
781 if (pdw)
782 if (memcmp(a1, a2, pdw << 2))
783 return false;
784
785 if (pbi) {
786 __be32 mask;
787
788 mask = htonl((0xffffffff) << (32 - pbi));
789
790 if ((a1[pdw] ^ a2[pdw]) & mask)
791 return false;
792 }
793
794 return true;
795 }
796
797 static __inline__
798 __be16 xfrm_flowi_sport(const struct flowi *fl)
799 {
800 __be16 port;
801 switch(fl->proto) {
802 case IPPROTO_TCP:
803 case IPPROTO_UDP:
804 case IPPROTO_UDPLITE:
805 case IPPROTO_SCTP:
806 port = fl->fl_ip_sport;
807 break;
808 case IPPROTO_ICMP:
809 case IPPROTO_ICMPV6:
810 port = htons(fl->fl_icmp_type);
811 break;
812 case IPPROTO_MH:
813 port = htons(fl->fl_mh_type);
814 break;
815 case IPPROTO_GRE:
816 port = htons(ntohl(fl->fl_gre_key) >> 16);
817 break;
818 default:
819 port = 0; /*XXX*/
820 }
821 return port;
822 }
823
824 static __inline__
825 __be16 xfrm_flowi_dport(const struct flowi *fl)
826 {
827 __be16 port;
828 switch(fl->proto) {
829 case IPPROTO_TCP:
830 case IPPROTO_UDP:
831 case IPPROTO_UDPLITE:
832 case IPPROTO_SCTP:
833 port = fl->fl_ip_dport;
834 break;
835 case IPPROTO_ICMP:
836 case IPPROTO_ICMPV6:
837 port = htons(fl->fl_icmp_code);
838 break;
839 case IPPROTO_GRE:
840 port = htons(ntohl(fl->fl_gre_key) & 0xffff);
841 break;
842 default:
843 port = 0; /*XXX*/
844 }
845 return port;
846 }
847
848 extern int xfrm_selector_match(struct xfrm_selector *sel,
849 const struct flowi *fl,
850 unsigned short family);
851
852 #ifdef CONFIG_SECURITY_NETWORK_XFRM
853 /* If neither has a context --> match
854 * Otherwise, both must have a context and the sids, doi, alg must match
855 */
856 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
857 {
858 return ((!s1 && !s2) ||
859 (s1 && s2 &&
860 (s1->ctx_sid == s2->ctx_sid) &&
861 (s1->ctx_doi == s2->ctx_doi) &&
862 (s1->ctx_alg == s2->ctx_alg)));
863 }
864 #else
865 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
866 {
867 return 1;
868 }
869 #endif
870
871 /* A struct encoding bundle of transformations to apply to some set of flow.
872 *
873 * dst->child points to the next element of bundle.
874 * dst->xfrm points to an instanse of transformer.
875 *
876 * Due to unfortunate limitations of current routing cache, which we
877 * have no time to fix, it mirrors struct rtable and bound to the same
878 * routing key, including saddr,daddr. However, we can have many of
879 * bundles differing by session id. All the bundles grow from a parent
880 * policy rule.
881 */
882 struct xfrm_dst {
883 union {
884 struct dst_entry dst;
885 struct rtable rt;
886 struct rt6_info rt6;
887 } u;
888 struct dst_entry *route;
889 struct flow_cache_object flo;
890 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
891 int num_pols, num_xfrms;
892 #ifdef CONFIG_XFRM_SUB_POLICY
893 struct flowi *origin;
894 struct xfrm_selector *partner;
895 #endif
896 u32 xfrm_genid;
897 u32 policy_genid;
898 u32 route_mtu_cached;
899 u32 child_mtu_cached;
900 u32 route_cookie;
901 u32 path_cookie;
902 };
903
904 #ifdef CONFIG_XFRM
905 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
906 {
907 xfrm_pols_put(xdst->pols, xdst->num_pols);
908 dst_release(xdst->route);
909 if (likely(xdst->u.dst.xfrm))
910 xfrm_state_put(xdst->u.dst.xfrm);
911 #ifdef CONFIG_XFRM_SUB_POLICY
912 kfree(xdst->origin);
913 xdst->origin = NULL;
914 kfree(xdst->partner);
915 xdst->partner = NULL;
916 #endif
917 }
918 #endif
919
920 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
921
922 struct sec_path {
923 atomic_t refcnt;
924 int len;
925 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
926 };
927
928 static inline struct sec_path *
929 secpath_get(struct sec_path *sp)
930 {
931 if (sp)
932 atomic_inc(&sp->refcnt);
933 return sp;
934 }
935
936 extern void __secpath_destroy(struct sec_path *sp);
937
938 static inline void
939 secpath_put(struct sec_path *sp)
940 {
941 if (sp && atomic_dec_and_test(&sp->refcnt))
942 __secpath_destroy(sp);
943 }
944
945 extern struct sec_path *secpath_dup(struct sec_path *src);
946
947 static inline void
948 secpath_reset(struct sk_buff *skb)
949 {
950 #ifdef CONFIG_XFRM
951 secpath_put(skb->sp);
952 skb->sp = NULL;
953 #endif
954 }
955
956 static inline int
957 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
958 {
959 switch (family) {
960 case AF_INET:
961 return addr->a4 == 0;
962 case AF_INET6:
963 return ipv6_addr_any((struct in6_addr *)&addr->a6);
964 }
965 return 0;
966 }
967
968 static inline int
969 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
970 {
971 return (tmpl->saddr.a4 &&
972 tmpl->saddr.a4 != x->props.saddr.a4);
973 }
974
975 static inline int
976 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
977 {
978 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
979 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
980 }
981
982 static inline int
983 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
984 {
985 switch (family) {
986 case AF_INET:
987 return __xfrm4_state_addr_cmp(tmpl, x);
988 case AF_INET6:
989 return __xfrm6_state_addr_cmp(tmpl, x);
990 }
991 return !0;
992 }
993
994 #ifdef CONFIG_XFRM
995 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
996
997 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
998 struct sk_buff *skb,
999 unsigned int family, int reverse)
1000 {
1001 struct net *net = dev_net(skb->dev);
1002 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1003
1004 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1005 return __xfrm_policy_check(sk, ndir, skb, family);
1006
1007 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1008 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1009 __xfrm_policy_check(sk, ndir, skb, family);
1010 }
1011
1012 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1013 {
1014 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1015 }
1016
1017 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1018 {
1019 return xfrm_policy_check(sk, dir, skb, AF_INET);
1020 }
1021
1022 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1023 {
1024 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1025 }
1026
1027 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1028 struct sk_buff *skb)
1029 {
1030 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1031 }
1032
1033 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1034 struct sk_buff *skb)
1035 {
1036 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1037 }
1038
1039 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1040 unsigned int family, int reverse);
1041
1042 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1043 unsigned int family)
1044 {
1045 return __xfrm_decode_session(skb, fl, family, 0);
1046 }
1047
1048 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1049 struct flowi *fl,
1050 unsigned int family)
1051 {
1052 return __xfrm_decode_session(skb, fl, family, 1);
1053 }
1054
1055 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1056
1057 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1058 {
1059 struct net *net = dev_net(skb->dev);
1060
1061 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1062 (skb_dst(skb)->flags & DST_NOXFRM) ||
1063 __xfrm_route_forward(skb, family);
1064 }
1065
1066 static inline int xfrm4_route_forward(struct sk_buff *skb)
1067 {
1068 return xfrm_route_forward(skb, AF_INET);
1069 }
1070
1071 static inline int xfrm6_route_forward(struct sk_buff *skb)
1072 {
1073 return xfrm_route_forward(skb, AF_INET6);
1074 }
1075
1076 extern int __xfrm_sk_clone_policy(struct sock *sk);
1077
1078 static inline int xfrm_sk_clone_policy(struct sock *sk)
1079 {
1080 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1081 return __xfrm_sk_clone_policy(sk);
1082 return 0;
1083 }
1084
1085 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1086
1087 static inline void xfrm_sk_free_policy(struct sock *sk)
1088 {
1089 if (unlikely(sk->sk_policy[0] != NULL)) {
1090 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1091 sk->sk_policy[0] = NULL;
1092 }
1093 if (unlikely(sk->sk_policy[1] != NULL)) {
1094 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1095 sk->sk_policy[1] = NULL;
1096 }
1097 }
1098
1099 #else
1100
1101 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1102 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1103 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1104 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1105 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1106 {
1107 return 1;
1108 }
1109 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1110 {
1111 return 1;
1112 }
1113 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1114 {
1115 return 1;
1116 }
1117 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1118 struct flowi *fl,
1119 unsigned int family)
1120 {
1121 return -ENOSYS;
1122 }
1123 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1124 struct sk_buff *skb)
1125 {
1126 return 1;
1127 }
1128 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1129 struct sk_buff *skb)
1130 {
1131 return 1;
1132 }
1133 #endif
1134
1135 static __inline__
1136 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1137 {
1138 switch (family){
1139 case AF_INET:
1140 return (xfrm_address_t *)&fl->fl4_dst;
1141 case AF_INET6:
1142 return (xfrm_address_t *)&fl->fl6_dst;
1143 }
1144 return NULL;
1145 }
1146
1147 static __inline__
1148 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1149 {
1150 switch (family){
1151 case AF_INET:
1152 return (xfrm_address_t *)&fl->fl4_src;
1153 case AF_INET6:
1154 return (xfrm_address_t *)&fl->fl6_src;
1155 }
1156 return NULL;
1157 }
1158
1159 static __inline__
1160 void xfrm_flowi_addr_get(const struct flowi *fl,
1161 xfrm_address_t *saddr, xfrm_address_t *daddr,
1162 unsigned short family)
1163 {
1164 switch(family) {
1165 case AF_INET:
1166 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1167 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1168 break;
1169 case AF_INET6:
1170 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1171 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1172 break;
1173 }
1174 }
1175
1176 static __inline__ int
1177 __xfrm4_state_addr_check(struct xfrm_state *x,
1178 xfrm_address_t *daddr, xfrm_address_t *saddr)
1179 {
1180 if (daddr->a4 == x->id.daddr.a4 &&
1181 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1182 return 1;
1183 return 0;
1184 }
1185
1186 static __inline__ int
1187 __xfrm6_state_addr_check(struct xfrm_state *x,
1188 xfrm_address_t *daddr, xfrm_address_t *saddr)
1189 {
1190 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1191 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1192 ipv6_addr_any((struct in6_addr *)saddr) ||
1193 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1194 return 1;
1195 return 0;
1196 }
1197
1198 static __inline__ int
1199 xfrm_state_addr_check(struct xfrm_state *x,
1200 xfrm_address_t *daddr, xfrm_address_t *saddr,
1201 unsigned short family)
1202 {
1203 switch (family) {
1204 case AF_INET:
1205 return __xfrm4_state_addr_check(x, daddr, saddr);
1206 case AF_INET6:
1207 return __xfrm6_state_addr_check(x, daddr, saddr);
1208 }
1209 return 0;
1210 }
1211
1212 static __inline__ int
1213 xfrm_state_addr_flow_check(struct xfrm_state *x, const struct flowi *fl,
1214 unsigned short family)
1215 {
1216 switch (family) {
1217 case AF_INET:
1218 return __xfrm4_state_addr_check(x,
1219 (xfrm_address_t *)&fl->fl4_dst,
1220 (xfrm_address_t *)&fl->fl4_src);
1221 case AF_INET6:
1222 return __xfrm6_state_addr_check(x,
1223 (xfrm_address_t *)&fl->fl6_dst,
1224 (xfrm_address_t *)&fl->fl6_src);
1225 }
1226 return 0;
1227 }
1228
1229 static inline int xfrm_state_kern(struct xfrm_state *x)
1230 {
1231 return atomic_read(&x->tunnel_users);
1232 }
1233
1234 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1235 {
1236 return (!userproto || proto == userproto ||
1237 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1238 proto == IPPROTO_ESP ||
1239 proto == IPPROTO_COMP)));
1240 }
1241
1242 /*
1243 * xfrm algorithm information
1244 */
1245 struct xfrm_algo_aead_info {
1246 u16 icv_truncbits;
1247 };
1248
1249 struct xfrm_algo_auth_info {
1250 u16 icv_truncbits;
1251 u16 icv_fullbits;
1252 };
1253
1254 struct xfrm_algo_encr_info {
1255 u16 blockbits;
1256 u16 defkeybits;
1257 };
1258
1259 struct xfrm_algo_comp_info {
1260 u16 threshold;
1261 };
1262
1263 struct xfrm_algo_desc {
1264 char *name;
1265 char *compat;
1266 u8 available:1;
1267 union {
1268 struct xfrm_algo_aead_info aead;
1269 struct xfrm_algo_auth_info auth;
1270 struct xfrm_algo_encr_info encr;
1271 struct xfrm_algo_comp_info comp;
1272 } uinfo;
1273 struct sadb_alg desc;
1274 };
1275
1276 /* XFRM tunnel handlers. */
1277 struct xfrm_tunnel {
1278 int (*handler)(struct sk_buff *skb);
1279 int (*err_handler)(struct sk_buff *skb, u32 info);
1280
1281 struct xfrm_tunnel __rcu *next;
1282 int priority;
1283 };
1284
1285 struct xfrm6_tunnel {
1286 int (*handler)(struct sk_buff *skb);
1287 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1288 u8 type, u8 code, int offset, __be32 info);
1289 struct xfrm6_tunnel __rcu *next;
1290 int priority;
1291 };
1292
1293 extern void xfrm_init(void);
1294 extern void xfrm4_init(int rt_hash_size);
1295 extern int xfrm_state_init(struct net *net);
1296 extern void xfrm_state_fini(struct net *net);
1297 extern void xfrm4_state_init(void);
1298 #ifdef CONFIG_XFRM
1299 extern int xfrm6_init(void);
1300 extern void xfrm6_fini(void);
1301 extern int xfrm6_state_init(void);
1302 extern void xfrm6_state_fini(void);
1303 #else
1304 static inline int xfrm6_init(void)
1305 {
1306 return 0;
1307 }
1308 static inline void xfrm6_fini(void)
1309 {
1310 ;
1311 }
1312 #endif
1313
1314 #ifdef CONFIG_XFRM_STATISTICS
1315 extern int xfrm_proc_init(struct net *net);
1316 extern void xfrm_proc_fini(struct net *net);
1317 #endif
1318
1319 extern int xfrm_sysctl_init(struct net *net);
1320 #ifdef CONFIG_SYSCTL
1321 extern void xfrm_sysctl_fini(struct net *net);
1322 #else
1323 static inline void xfrm_sysctl_fini(struct net *net)
1324 {
1325 }
1326 #endif
1327
1328 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1329 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1330 int (*func)(struct xfrm_state *, int, void*), void *);
1331 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1332 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1333 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr,
1334 xfrm_address_t *saddr,
1335 const struct flowi *fl,
1336 struct xfrm_tmpl *tmpl,
1337 struct xfrm_policy *pol, int *err,
1338 unsigned short family);
1339 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1340 xfrm_address_t *daddr,
1341 xfrm_address_t *saddr,
1342 unsigned short family,
1343 u8 mode, u8 proto, u32 reqid);
1344 extern int xfrm_state_check_expire(struct xfrm_state *x);
1345 extern void xfrm_state_insert(struct xfrm_state *x);
1346 extern int xfrm_state_add(struct xfrm_state *x);
1347 extern int xfrm_state_update(struct xfrm_state *x);
1348 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1349 xfrm_address_t *daddr, __be32 spi,
1350 u8 proto, unsigned short family);
1351 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1352 xfrm_address_t *daddr,
1353 xfrm_address_t *saddr,
1354 u8 proto,
1355 unsigned short family);
1356 #ifdef CONFIG_XFRM_SUB_POLICY
1357 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1358 int n, unsigned short family);
1359 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1360 int n, unsigned short family);
1361 #else
1362 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1363 int n, unsigned short family)
1364 {
1365 return -ENOSYS;
1366 }
1367
1368 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1369 int n, unsigned short family)
1370 {
1371 return -ENOSYS;
1372 }
1373 #endif
1374
1375 struct xfrmk_sadinfo {
1376 u32 sadhcnt; /* current hash bkts */
1377 u32 sadhmcnt; /* max allowed hash bkts */
1378 u32 sadcnt; /* current running count */
1379 };
1380
1381 struct xfrmk_spdinfo {
1382 u32 incnt;
1383 u32 outcnt;
1384 u32 fwdcnt;
1385 u32 inscnt;
1386 u32 outscnt;
1387 u32 fwdscnt;
1388 u32 spdhcnt;
1389 u32 spdhmcnt;
1390 };
1391
1392 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1393 u32 seq);
1394 extern int xfrm_state_delete(struct xfrm_state *x);
1395 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1396 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1397 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1398 extern int xfrm_replay_check(struct xfrm_state *x,
1399 struct sk_buff *skb, __be32 seq);
1400 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1401 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1402 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1403 extern int xfrm_init_state(struct xfrm_state *x);
1404 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1405 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1406 int encap_type);
1407 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1408 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1409 extern int xfrm_output(struct sk_buff *skb);
1410 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1411 extern int xfrm4_extract_header(struct sk_buff *skb);
1412 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1413 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1414 int encap_type);
1415 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1416 extern int xfrm4_rcv(struct sk_buff *skb);
1417
1418 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1419 {
1420 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1421 }
1422
1423 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1424 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1425 extern int xfrm4_output(struct sk_buff *skb);
1426 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1427 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1428 extern int xfrm6_extract_header(struct sk_buff *skb);
1429 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1430 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1431 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1432 extern int xfrm6_rcv(struct sk_buff *skb);
1433 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1434 xfrm_address_t *saddr, u8 proto);
1435 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1436 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1437 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1438 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
1439 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1440 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1441 extern int xfrm6_output(struct sk_buff *skb);
1442 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1443 u8 **prevhdr);
1444
1445 #ifdef CONFIG_XFRM
1446 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1447 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1448 #else
1449 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1450 {
1451 return -ENOPROTOOPT;
1452 }
1453
1454 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1455 {
1456 /* should not happen */
1457 kfree_skb(skb);
1458 return 0;
1459 }
1460 #endif
1461
1462 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1463
1464 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1465 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1466 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1467 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1468 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1469 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1470 u8 type, int dir,
1471 struct xfrm_selector *sel,
1472 struct xfrm_sec_ctx *ctx, int delete,
1473 int *err);
1474 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1475 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1476 u32 xfrm_get_acqseq(void);
1477 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1478 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1479 u8 mode, u32 reqid, u8 proto,
1480 xfrm_address_t *daddr,
1481 xfrm_address_t *saddr, int create,
1482 unsigned short family);
1483 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1484
1485 #ifdef CONFIG_XFRM_MIGRATE
1486 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1487 struct xfrm_migrate *m, int num_bundles,
1488 struct xfrm_kmaddress *k);
1489 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1490 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1491 struct xfrm_migrate *m);
1492 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1493 struct xfrm_migrate *m, int num_bundles,
1494 struct xfrm_kmaddress *k);
1495 #endif
1496
1497 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1498 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1499 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1500
1501 extern void xfrm_input_init(void);
1502 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1503
1504 extern void xfrm_probe_algs(void);
1505 extern int xfrm_count_auth_supported(void);
1506 extern int xfrm_count_enc_supported(void);
1507 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1508 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1509 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1510 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1511 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1512 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1513 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1514 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1515 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1516 int probe);
1517
1518 struct hash_desc;
1519 struct scatterlist;
1520 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1521 unsigned int);
1522
1523 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1524 int family)
1525 {
1526 switch (family) {
1527 default:
1528 case AF_INET:
1529 return (__force u32)a->a4 - (__force u32)b->a4;
1530 case AF_INET6:
1531 return ipv6_addr_cmp((struct in6_addr *)a,
1532 (struct in6_addr *)b);
1533 }
1534 }
1535
1536 static inline int xfrm_policy_id2dir(u32 index)
1537 {
1538 return index & 7;
1539 }
1540
1541 #ifdef CONFIG_XFRM
1542 static inline int xfrm_aevent_is_on(struct net *net)
1543 {
1544 struct sock *nlsk;
1545 int ret = 0;
1546
1547 rcu_read_lock();
1548 nlsk = rcu_dereference(net->xfrm.nlsk);
1549 if (nlsk)
1550 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1551 rcu_read_unlock();
1552 return ret;
1553 }
1554 #endif
1555
1556 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1557 {
1558 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1559 }
1560
1561 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1562 {
1563 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1564 }
1565
1566 #ifdef CONFIG_XFRM_MIGRATE
1567 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1568 {
1569 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1570 }
1571
1572 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1573 {
1574 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1575 }
1576
1577 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1578 {
1579 int i;
1580 for (i = 0; i < n; i++)
1581 xfrm_state_put(*(states + i));
1582 }
1583
1584 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1585 {
1586 int i;
1587 for (i = 0; i < n; i++)
1588 xfrm_state_delete(*(states + i));
1589 }
1590 #endif
1591
1592 #ifdef CONFIG_XFRM
1593 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1594 {
1595 return skb->sp->xvec[skb->sp->len - 1];
1596 }
1597 #endif
1598
1599 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1600 {
1601 if (attrs[XFRMA_MARK])
1602 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1603 else
1604 m->v = m->m = 0;
1605
1606 return m->v & m->m;
1607 }
1608
1609 static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m)
1610 {
1611 if (m->m | m->v)
1612 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1613 return 0;
1614
1615 nla_put_failure:
1616 return -1;
1617 }
1618
1619 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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