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{pktgen, xfrm} Introduce xfrm_state_lookup_byspi for pktgen
[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
57 /* Organization of SPD aka "XFRM rules"
58 ------------------------------------
59
60 Basic objects:
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
65
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
70
71 Lookup is plain linear search until the first match with selector.
72
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
79
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
83 |---. child .-> NULL
84
85 Bundles are cached at xrfm_policy struct (field ->bundles).
86
87
88 Resolution of xrfm_tmpl
89 -----------------------
90 Template contains:
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
101 flow id?
102
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
106
107 PROBLEMS:
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116 */
117
118 struct xfrm_state_walk {
119 struct list_head all;
120 u8 state;
121 union {
122 u8 dying;
123 u8 proto;
124 };
125 u32 seq;
126 };
127
128 /* Full description of state of transformer. */
129 struct xfrm_state {
130 #ifdef CONFIG_NET_NS
131 struct net *xs_net;
132 #endif
133 union {
134 struct hlist_node gclist;
135 struct hlist_node bydst;
136 };
137 struct hlist_node bysrc;
138 struct hlist_node byspi;
139
140 atomic_t refcnt;
141 spinlock_t lock;
142
143 struct xfrm_id id;
144 struct xfrm_selector sel;
145 struct xfrm_mark mark;
146 u32 tfcpad;
147
148 u32 genid;
149
150 /* Key manager bits */
151 struct xfrm_state_walk km;
152
153 /* Parameters of this state. */
154 struct {
155 u32 reqid;
156 u8 mode;
157 u8 replay_window;
158 u8 aalgo, ealgo, calgo;
159 u8 flags;
160 u16 family;
161 xfrm_address_t saddr;
162 int header_len;
163 int trailer_len;
164 u32 extra_flags;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo_auth *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189 struct xfrm_replay_state_esn *replay_esn;
190
191 /* Replay detection state at the time we sent the last notification */
192 struct xfrm_replay_state preplay;
193 struct xfrm_replay_state_esn *preplay_esn;
194
195 /* The functions for replay detection. */
196 struct xfrm_replay *repl;
197
198 /* internal flag that only holds state for delayed aevent at the
199 * moment
200 */
201 u32 xflags;
202
203 /* Replay detection notification settings */
204 u32 replay_maxage;
205 u32 replay_maxdiff;
206
207 /* Replay detection notification timer */
208 struct timer_list rtimer;
209
210 /* Statistics */
211 struct xfrm_stats stats;
212
213 struct xfrm_lifetime_cur curlft;
214 struct tasklet_hrtimer mtimer;
215
216 /* used to fix curlft->add_time when changing date */
217 long saved_tmo;
218
219 /* Last used time */
220 unsigned long lastused;
221
222 /* Reference to data common to all the instances of this
223 * transformer. */
224 const struct xfrm_type *type;
225 struct xfrm_mode *inner_mode;
226 struct xfrm_mode *inner_mode_iaf;
227 struct xfrm_mode *outer_mode;
228
229 /* Security context */
230 struct xfrm_sec_ctx *security;
231
232 /* Private data of this transformer, format is opaque,
233 * interpreted by xfrm_type methods. */
234 void *data;
235 };
236
237 static inline struct net *xs_net(struct xfrm_state *x)
238 {
239 return read_pnet(&x->xs_net);
240 }
241
242 /* xflags - make enum if more show up */
243 #define XFRM_TIME_DEFER 1
244 #define XFRM_SOFT_EXPIRE 2
245
246 enum {
247 XFRM_STATE_VOID,
248 XFRM_STATE_ACQ,
249 XFRM_STATE_VALID,
250 XFRM_STATE_ERROR,
251 XFRM_STATE_EXPIRED,
252 XFRM_STATE_DEAD
253 };
254
255 /* callback structure passed from either netlink or pfkey */
256 struct km_event {
257 union {
258 u32 hard;
259 u32 proto;
260 u32 byid;
261 u32 aevent;
262 u32 type;
263 } data;
264
265 u32 seq;
266 u32 portid;
267 u32 event;
268 struct net *net;
269 };
270
271 struct xfrm_replay {
272 void (*advance)(struct xfrm_state *x, __be32 net_seq);
273 int (*check)(struct xfrm_state *x,
274 struct sk_buff *skb,
275 __be32 net_seq);
276 int (*recheck)(struct xfrm_state *x,
277 struct sk_buff *skb,
278 __be32 net_seq);
279 void (*notify)(struct xfrm_state *x, int event);
280 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
281 };
282
283 struct net_device;
284 struct xfrm_type;
285 struct xfrm_dst;
286 struct xfrm_policy_afinfo {
287 unsigned short family;
288 struct dst_ops *dst_ops;
289 void (*garbage_collect)(struct net *net);
290 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
291 const xfrm_address_t *saddr,
292 const xfrm_address_t *daddr);
293 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
294 void (*decode_session)(struct sk_buff *skb,
295 struct flowi *fl,
296 int reverse);
297 int (*get_tos)(const struct flowi *fl);
298 void (*init_dst)(struct net *net,
299 struct xfrm_dst *dst);
300 int (*init_path)(struct xfrm_dst *path,
301 struct dst_entry *dst,
302 int nfheader_len);
303 int (*fill_dst)(struct xfrm_dst *xdst,
304 struct net_device *dev,
305 const struct flowi *fl);
306 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
307 };
308
309 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
310 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
311 void km_policy_notify(struct xfrm_policy *xp, int dir,
312 const struct km_event *c);
313 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
314
315 struct xfrm_tmpl;
316 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
317 struct xfrm_policy *pol);
318 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
319 int __xfrm_state_delete(struct xfrm_state *x);
320
321 struct xfrm_state_afinfo {
322 unsigned int family;
323 unsigned int proto;
324 __be16 eth_proto;
325 struct module *owner;
326 const struct xfrm_type *type_map[IPPROTO_MAX];
327 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
328 int (*init_flags)(struct xfrm_state *x);
329 void (*init_tempsel)(struct xfrm_selector *sel,
330 const struct flowi *fl);
331 void (*init_temprop)(struct xfrm_state *x,
332 const struct xfrm_tmpl *tmpl,
333 const xfrm_address_t *daddr,
334 const xfrm_address_t *saddr);
335 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
336 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
337 int (*output)(struct sk_buff *skb);
338 int (*output_finish)(struct sk_buff *skb);
339 int (*extract_input)(struct xfrm_state *x,
340 struct sk_buff *skb);
341 int (*extract_output)(struct xfrm_state *x,
342 struct sk_buff *skb);
343 int (*transport_finish)(struct sk_buff *skb,
344 int async);
345 void (*local_error)(struct sk_buff *skb, u32 mtu);
346 };
347
348 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
349 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
350 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
351 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
352
353 void xfrm_state_delete_tunnel(struct xfrm_state *x);
354
355 struct xfrm_type {
356 char *description;
357 struct module *owner;
358 u8 proto;
359 u8 flags;
360 #define XFRM_TYPE_NON_FRAGMENT 1
361 #define XFRM_TYPE_REPLAY_PROT 2
362 #define XFRM_TYPE_LOCAL_COADDR 4
363 #define XFRM_TYPE_REMOTE_COADDR 8
364
365 int (*init_state)(struct xfrm_state *x);
366 void (*destructor)(struct xfrm_state *);
367 int (*input)(struct xfrm_state *, struct sk_buff *skb);
368 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
369 int (*reject)(struct xfrm_state *, struct sk_buff *,
370 const struct flowi *);
371 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
372 /* Estimate maximal size of result of transformation of a dgram */
373 u32 (*get_mtu)(struct xfrm_state *, int size);
374 };
375
376 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
377 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
378
379 struct xfrm_mode {
380 /*
381 * Remove encapsulation header.
382 *
383 * The IP header will be moved over the top of the encapsulation
384 * header.
385 *
386 * On entry, the transport header shall point to where the IP header
387 * should be and the network header shall be set to where the IP
388 * header currently is. skb->data shall point to the start of the
389 * payload.
390 */
391 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
392
393 /*
394 * This is the actual input entry point.
395 *
396 * For transport mode and equivalent this would be identical to
397 * input2 (which does not need to be set). While tunnel mode
398 * and equivalent would set this to the tunnel encapsulation function
399 * xfrm4_prepare_input that would in turn call input2.
400 */
401 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
402
403 /*
404 * Add encapsulation header.
405 *
406 * On exit, the transport header will be set to the start of the
407 * encapsulation header to be filled in by x->type->output and
408 * the mac header will be set to the nextheader (protocol for
409 * IPv4) field of the extension header directly preceding the
410 * encapsulation header, or in its absence, that of the top IP
411 * header. The value of the network header will always point
412 * to the top IP header while skb->data will point to the payload.
413 */
414 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
415
416 /*
417 * This is the actual output entry point.
418 *
419 * For transport mode and equivalent this would be identical to
420 * output2 (which does not need to be set). While tunnel mode
421 * and equivalent would set this to a tunnel encapsulation function
422 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
423 * call output2.
424 */
425 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
426
427 struct xfrm_state_afinfo *afinfo;
428 struct module *owner;
429 unsigned int encap;
430 int flags;
431 };
432
433 /* Flags for xfrm_mode. */
434 enum {
435 XFRM_MODE_FLAG_TUNNEL = 1,
436 };
437
438 int xfrm_register_mode(struct xfrm_mode *mode, int family);
439 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
440
441 static inline int xfrm_af2proto(unsigned int family)
442 {
443 switch(family) {
444 case AF_INET:
445 return IPPROTO_IPIP;
446 case AF_INET6:
447 return IPPROTO_IPV6;
448 default:
449 return 0;
450 }
451 }
452
453 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
454 {
455 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
456 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
457 return x->inner_mode;
458 else
459 return x->inner_mode_iaf;
460 }
461
462 struct xfrm_tmpl {
463 /* id in template is interpreted as:
464 * daddr - destination of tunnel, may be zero for transport mode.
465 * spi - zero to acquire spi. Not zero if spi is static, then
466 * daddr must be fixed too.
467 * proto - AH/ESP/IPCOMP
468 */
469 struct xfrm_id id;
470
471 /* Source address of tunnel. Ignored, if it is not a tunnel. */
472 xfrm_address_t saddr;
473
474 unsigned short encap_family;
475
476 u32 reqid;
477
478 /* Mode: transport, tunnel etc. */
479 u8 mode;
480
481 /* Sharing mode: unique, this session only, this user only etc. */
482 u8 share;
483
484 /* May skip this transfomration if no SA is found */
485 u8 optional;
486
487 /* Skip aalgos/ealgos/calgos checks. */
488 u8 allalgs;
489
490 /* Bit mask of algos allowed for acquisition */
491 u32 aalgos;
492 u32 ealgos;
493 u32 calgos;
494 };
495
496 #define XFRM_MAX_DEPTH 6
497
498 struct xfrm_policy_walk_entry {
499 struct list_head all;
500 u8 dead;
501 };
502
503 struct xfrm_policy_walk {
504 struct xfrm_policy_walk_entry walk;
505 u8 type;
506 u32 seq;
507 };
508
509 struct xfrm_policy_queue {
510 struct sk_buff_head hold_queue;
511 struct timer_list hold_timer;
512 unsigned long timeout;
513 };
514
515 struct xfrm_policy {
516 #ifdef CONFIG_NET_NS
517 struct net *xp_net;
518 #endif
519 struct hlist_node bydst;
520 struct hlist_node byidx;
521
522 /* This lock only affects elements except for entry. */
523 rwlock_t lock;
524 atomic_t refcnt;
525 struct timer_list timer;
526
527 struct flow_cache_object flo;
528 atomic_t genid;
529 u32 priority;
530 u32 index;
531 struct xfrm_mark mark;
532 struct xfrm_selector selector;
533 struct xfrm_lifetime_cfg lft;
534 struct xfrm_lifetime_cur curlft;
535 struct xfrm_policy_walk_entry walk;
536 struct xfrm_policy_queue polq;
537 u8 type;
538 u8 action;
539 u8 flags;
540 u8 xfrm_nr;
541 u16 family;
542 struct xfrm_sec_ctx *security;
543 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
544 };
545
546 static inline struct net *xp_net(const struct xfrm_policy *xp)
547 {
548 return read_pnet(&xp->xp_net);
549 }
550
551 struct xfrm_kmaddress {
552 xfrm_address_t local;
553 xfrm_address_t remote;
554 u32 reserved;
555 u16 family;
556 };
557
558 struct xfrm_migrate {
559 xfrm_address_t old_daddr;
560 xfrm_address_t old_saddr;
561 xfrm_address_t new_daddr;
562 xfrm_address_t new_saddr;
563 u8 proto;
564 u8 mode;
565 u16 reserved;
566 u32 reqid;
567 u16 old_family;
568 u16 new_family;
569 };
570
571 #define XFRM_KM_TIMEOUT 30
572 /* what happened */
573 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
574 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
575
576 /* default aevent timeout in units of 100ms */
577 #define XFRM_AE_ETIME 10
578 /* Async Event timer multiplier */
579 #define XFRM_AE_ETH_M 10
580 /* default seq threshold size */
581 #define XFRM_AE_SEQT_SIZE 2
582
583 struct xfrm_mgr {
584 struct list_head list;
585 char *id;
586 int (*notify)(struct xfrm_state *x, const struct km_event *c);
587 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
588 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
589 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
590 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
591 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
592 int (*migrate)(const struct xfrm_selector *sel,
593 u8 dir, u8 type,
594 const struct xfrm_migrate *m,
595 int num_bundles,
596 const struct xfrm_kmaddress *k);
597 };
598
599 int xfrm_register_km(struct xfrm_mgr *km);
600 int xfrm_unregister_km(struct xfrm_mgr *km);
601
602 /*
603 * This structure is used for the duration where packets are being
604 * transformed by IPsec. As soon as the packet leaves IPsec the
605 * area beyond the generic IP part may be overwritten.
606 */
607 struct xfrm_skb_cb {
608 union {
609 struct inet_skb_parm h4;
610 struct inet6_skb_parm h6;
611 } header;
612
613 /* Sequence number for replay protection. */
614 union {
615 struct {
616 __u32 low;
617 __u32 hi;
618 } output;
619 struct {
620 __be32 low;
621 __be32 hi;
622 } input;
623 } seq;
624 };
625
626 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
627
628 /*
629 * This structure is used by the afinfo prepare_input/prepare_output functions
630 * to transmit header information to the mode input/output functions.
631 */
632 struct xfrm_mode_skb_cb {
633 union {
634 struct inet_skb_parm h4;
635 struct inet6_skb_parm h6;
636 } header;
637
638 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
639 __be16 id;
640 __be16 frag_off;
641
642 /* IP header length (excluding options or extension headers). */
643 u8 ihl;
644
645 /* TOS for IPv4, class for IPv6. */
646 u8 tos;
647
648 /* TTL for IPv4, hop limitfor IPv6. */
649 u8 ttl;
650
651 /* Protocol for IPv4, NH for IPv6. */
652 u8 protocol;
653
654 /* Option length for IPv4, zero for IPv6. */
655 u8 optlen;
656
657 /* Used by IPv6 only, zero for IPv4. */
658 u8 flow_lbl[3];
659 };
660
661 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
662
663 /*
664 * This structure is used by the input processing to locate the SPI and
665 * related information.
666 */
667 struct xfrm_spi_skb_cb {
668 union {
669 struct inet_skb_parm h4;
670 struct inet6_skb_parm h6;
671 } header;
672
673 unsigned int daddroff;
674 unsigned int family;
675 };
676
677 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
678
679 /* Audit Information */
680 struct xfrm_audit {
681 u32 secid;
682 kuid_t loginuid;
683 u32 sessionid;
684 };
685
686 #ifdef CONFIG_AUDITSYSCALL
687 static inline struct audit_buffer *xfrm_audit_start(const char *op)
688 {
689 struct audit_buffer *audit_buf = NULL;
690
691 if (audit_enabled == 0)
692 return NULL;
693 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
694 AUDIT_MAC_IPSEC_EVENT);
695 if (audit_buf == NULL)
696 return NULL;
697 audit_log_format(audit_buf, "op=%s", op);
698 return audit_buf;
699 }
700
701 static inline void xfrm_audit_helper_usrinfo(kuid_t auid, u32 ses, u32 secid,
702 struct audit_buffer *audit_buf)
703 {
704 char *secctx;
705 u32 secctx_len;
706
707 audit_log_format(audit_buf, " auid=%u ses=%u",
708 from_kuid(&init_user_ns, auid), ses);
709 if (secid != 0 &&
710 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
711 audit_log_format(audit_buf, " subj=%s", secctx);
712 security_release_secctx(secctx, secctx_len);
713 } else
714 audit_log_task_context(audit_buf);
715 }
716
717 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, kuid_t auid,
718 u32 ses, u32 secid);
719 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, kuid_t auid,
720 u32 ses, u32 secid);
721 void xfrm_audit_state_add(struct xfrm_state *x, int result, kuid_t auid,
722 u32 ses, u32 secid);
723 void xfrm_audit_state_delete(struct xfrm_state *x, int result, kuid_t auid,
724 u32 ses, u32 secid);
725 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
726 struct sk_buff *skb);
727 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
728 __be32 net_seq);
729 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
730 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
731 __be32 net_seq);
732 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
733 u8 proto);
734 #else
735
736 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
737 kuid_t auid, u32 ses, u32 secid)
738 {
739 }
740
741 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
742 kuid_t auid, u32 ses, u32 secid)
743 {
744 }
745
746 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
747 kuid_t auid, u32 ses, u32 secid)
748 {
749 }
750
751 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
752 kuid_t auid, u32 ses, u32 secid)
753 {
754 }
755
756 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
757 struct sk_buff *skb)
758 {
759 }
760
761 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
762 struct sk_buff *skb, __be32 net_seq)
763 {
764 }
765
766 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
767 u16 family)
768 {
769 }
770
771 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
772 __be32 net_spi, __be32 net_seq)
773 {
774 }
775
776 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
777 struct sk_buff *skb, u8 proto)
778 {
779 }
780 #endif /* CONFIG_AUDITSYSCALL */
781
782 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
783 {
784 if (likely(policy != NULL))
785 atomic_inc(&policy->refcnt);
786 }
787
788 void xfrm_policy_destroy(struct xfrm_policy *policy);
789
790 static inline void xfrm_pol_put(struct xfrm_policy *policy)
791 {
792 if (atomic_dec_and_test(&policy->refcnt))
793 xfrm_policy_destroy(policy);
794 }
795
796 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
797 {
798 int i;
799 for (i = npols - 1; i >= 0; --i)
800 xfrm_pol_put(pols[i]);
801 }
802
803 void __xfrm_state_destroy(struct xfrm_state *);
804
805 static inline void __xfrm_state_put(struct xfrm_state *x)
806 {
807 atomic_dec(&x->refcnt);
808 }
809
810 static inline void xfrm_state_put(struct xfrm_state *x)
811 {
812 if (atomic_dec_and_test(&x->refcnt))
813 __xfrm_state_destroy(x);
814 }
815
816 static inline void xfrm_state_hold(struct xfrm_state *x)
817 {
818 atomic_inc(&x->refcnt);
819 }
820
821 static inline bool addr_match(const void *token1, const void *token2,
822 int prefixlen)
823 {
824 const __be32 *a1 = token1;
825 const __be32 *a2 = token2;
826 int pdw;
827 int pbi;
828
829 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
830 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
831
832 if (pdw)
833 if (memcmp(a1, a2, pdw << 2))
834 return false;
835
836 if (pbi) {
837 __be32 mask;
838
839 mask = htonl((0xffffffff) << (32 - pbi));
840
841 if ((a1[pdw] ^ a2[pdw]) & mask)
842 return false;
843 }
844
845 return true;
846 }
847
848 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
849 {
850 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
851 if (prefixlen == 0)
852 return true;
853 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
854 }
855
856 static __inline__
857 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
858 {
859 __be16 port;
860 switch(fl->flowi_proto) {
861 case IPPROTO_TCP:
862 case IPPROTO_UDP:
863 case IPPROTO_UDPLITE:
864 case IPPROTO_SCTP:
865 port = uli->ports.sport;
866 break;
867 case IPPROTO_ICMP:
868 case IPPROTO_ICMPV6:
869 port = htons(uli->icmpt.type);
870 break;
871 case IPPROTO_MH:
872 port = htons(uli->mht.type);
873 break;
874 case IPPROTO_GRE:
875 port = htons(ntohl(uli->gre_key) >> 16);
876 break;
877 default:
878 port = 0; /*XXX*/
879 }
880 return port;
881 }
882
883 static __inline__
884 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
885 {
886 __be16 port;
887 switch(fl->flowi_proto) {
888 case IPPROTO_TCP:
889 case IPPROTO_UDP:
890 case IPPROTO_UDPLITE:
891 case IPPROTO_SCTP:
892 port = uli->ports.dport;
893 break;
894 case IPPROTO_ICMP:
895 case IPPROTO_ICMPV6:
896 port = htons(uli->icmpt.code);
897 break;
898 case IPPROTO_GRE:
899 port = htons(ntohl(uli->gre_key) & 0xffff);
900 break;
901 default:
902 port = 0; /*XXX*/
903 }
904 return port;
905 }
906
907 bool xfrm_selector_match(const struct xfrm_selector *sel,
908 const struct flowi *fl, unsigned short family);
909
910 #ifdef CONFIG_SECURITY_NETWORK_XFRM
911 /* If neither has a context --> match
912 * Otherwise, both must have a context and the sids, doi, alg must match
913 */
914 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
915 {
916 return ((!s1 && !s2) ||
917 (s1 && s2 &&
918 (s1->ctx_sid == s2->ctx_sid) &&
919 (s1->ctx_doi == s2->ctx_doi) &&
920 (s1->ctx_alg == s2->ctx_alg)));
921 }
922 #else
923 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
924 {
925 return true;
926 }
927 #endif
928
929 /* A struct encoding bundle of transformations to apply to some set of flow.
930 *
931 * dst->child points to the next element of bundle.
932 * dst->xfrm points to an instanse of transformer.
933 *
934 * Due to unfortunate limitations of current routing cache, which we
935 * have no time to fix, it mirrors struct rtable and bound to the same
936 * routing key, including saddr,daddr. However, we can have many of
937 * bundles differing by session id. All the bundles grow from a parent
938 * policy rule.
939 */
940 struct xfrm_dst {
941 union {
942 struct dst_entry dst;
943 struct rtable rt;
944 struct rt6_info rt6;
945 } u;
946 struct dst_entry *route;
947 struct flow_cache_object flo;
948 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
949 int num_pols, num_xfrms;
950 #ifdef CONFIG_XFRM_SUB_POLICY
951 struct flowi *origin;
952 struct xfrm_selector *partner;
953 #endif
954 u32 xfrm_genid;
955 u32 policy_genid;
956 u32 route_mtu_cached;
957 u32 child_mtu_cached;
958 u32 route_cookie;
959 u32 path_cookie;
960 };
961
962 #ifdef CONFIG_XFRM
963 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
964 {
965 xfrm_pols_put(xdst->pols, xdst->num_pols);
966 dst_release(xdst->route);
967 if (likely(xdst->u.dst.xfrm))
968 xfrm_state_put(xdst->u.dst.xfrm);
969 #ifdef CONFIG_XFRM_SUB_POLICY
970 kfree(xdst->origin);
971 xdst->origin = NULL;
972 kfree(xdst->partner);
973 xdst->partner = NULL;
974 #endif
975 }
976 #endif
977
978 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
979
980 struct sec_path {
981 atomic_t refcnt;
982 int len;
983 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
984 };
985
986 static inline int secpath_exists(struct sk_buff *skb)
987 {
988 #ifdef CONFIG_XFRM
989 return skb->sp != NULL;
990 #else
991 return 0;
992 #endif
993 }
994
995 static inline struct sec_path *
996 secpath_get(struct sec_path *sp)
997 {
998 if (sp)
999 atomic_inc(&sp->refcnt);
1000 return sp;
1001 }
1002
1003 void __secpath_destroy(struct sec_path *sp);
1004
1005 static inline void
1006 secpath_put(struct sec_path *sp)
1007 {
1008 if (sp && atomic_dec_and_test(&sp->refcnt))
1009 __secpath_destroy(sp);
1010 }
1011
1012 struct sec_path *secpath_dup(struct sec_path *src);
1013
1014 static inline void
1015 secpath_reset(struct sk_buff *skb)
1016 {
1017 #ifdef CONFIG_XFRM
1018 secpath_put(skb->sp);
1019 skb->sp = NULL;
1020 #endif
1021 }
1022
1023 static inline int
1024 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1025 {
1026 switch (family) {
1027 case AF_INET:
1028 return addr->a4 == 0;
1029 case AF_INET6:
1030 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1031 }
1032 return 0;
1033 }
1034
1035 static inline int
1036 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1037 {
1038 return (tmpl->saddr.a4 &&
1039 tmpl->saddr.a4 != x->props.saddr.a4);
1040 }
1041
1042 static inline int
1043 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1044 {
1045 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1046 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1047 }
1048
1049 static inline int
1050 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1051 {
1052 switch (family) {
1053 case AF_INET:
1054 return __xfrm4_state_addr_cmp(tmpl, x);
1055 case AF_INET6:
1056 return __xfrm6_state_addr_cmp(tmpl, x);
1057 }
1058 return !0;
1059 }
1060
1061 #ifdef CONFIG_XFRM
1062 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1063 unsigned short family);
1064
1065 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1066 struct sk_buff *skb,
1067 unsigned int family, int reverse)
1068 {
1069 struct net *net = dev_net(skb->dev);
1070 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1071
1072 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1073 return __xfrm_policy_check(sk, ndir, skb, family);
1074
1075 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1076 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1077 __xfrm_policy_check(sk, ndir, skb, family);
1078 }
1079
1080 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1081 {
1082 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1083 }
1084
1085 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1086 {
1087 return xfrm_policy_check(sk, dir, skb, AF_INET);
1088 }
1089
1090 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1091 {
1092 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1093 }
1094
1095 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1096 struct sk_buff *skb)
1097 {
1098 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1099 }
1100
1101 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1102 struct sk_buff *skb)
1103 {
1104 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1105 }
1106
1107 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1108 unsigned int family, int reverse);
1109
1110 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1111 unsigned int family)
1112 {
1113 return __xfrm_decode_session(skb, fl, family, 0);
1114 }
1115
1116 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1117 struct flowi *fl,
1118 unsigned int family)
1119 {
1120 return __xfrm_decode_session(skb, fl, family, 1);
1121 }
1122
1123 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1124
1125 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1126 {
1127 struct net *net = dev_net(skb->dev);
1128
1129 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1130 (skb_dst(skb)->flags & DST_NOXFRM) ||
1131 __xfrm_route_forward(skb, family);
1132 }
1133
1134 static inline int xfrm4_route_forward(struct sk_buff *skb)
1135 {
1136 return xfrm_route_forward(skb, AF_INET);
1137 }
1138
1139 static inline int xfrm6_route_forward(struct sk_buff *skb)
1140 {
1141 return xfrm_route_forward(skb, AF_INET6);
1142 }
1143
1144 int __xfrm_sk_clone_policy(struct sock *sk);
1145
1146 static inline int xfrm_sk_clone_policy(struct sock *sk)
1147 {
1148 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1149 return __xfrm_sk_clone_policy(sk);
1150 return 0;
1151 }
1152
1153 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1154
1155 static inline void xfrm_sk_free_policy(struct sock *sk)
1156 {
1157 if (unlikely(sk->sk_policy[0] != NULL)) {
1158 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1159 sk->sk_policy[0] = NULL;
1160 }
1161 if (unlikely(sk->sk_policy[1] != NULL)) {
1162 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1163 sk->sk_policy[1] = NULL;
1164 }
1165 }
1166
1167 void xfrm_garbage_collect(struct net *net);
1168
1169 #else
1170
1171 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1172 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1173 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1174 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1175 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1176 {
1177 return 1;
1178 }
1179 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1180 {
1181 return 1;
1182 }
1183 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1184 {
1185 return 1;
1186 }
1187 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1188 struct flowi *fl,
1189 unsigned int family)
1190 {
1191 return -ENOSYS;
1192 }
1193 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1194 struct sk_buff *skb)
1195 {
1196 return 1;
1197 }
1198 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1199 struct sk_buff *skb)
1200 {
1201 return 1;
1202 }
1203 static inline void xfrm_garbage_collect(struct net *net)
1204 {
1205 }
1206 #endif
1207
1208 static __inline__
1209 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1210 {
1211 switch (family){
1212 case AF_INET:
1213 return (xfrm_address_t *)&fl->u.ip4.daddr;
1214 case AF_INET6:
1215 return (xfrm_address_t *)&fl->u.ip6.daddr;
1216 }
1217 return NULL;
1218 }
1219
1220 static __inline__
1221 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1222 {
1223 switch (family){
1224 case AF_INET:
1225 return (xfrm_address_t *)&fl->u.ip4.saddr;
1226 case AF_INET6:
1227 return (xfrm_address_t *)&fl->u.ip6.saddr;
1228 }
1229 return NULL;
1230 }
1231
1232 static __inline__
1233 void xfrm_flowi_addr_get(const struct flowi *fl,
1234 xfrm_address_t *saddr, xfrm_address_t *daddr,
1235 unsigned short family)
1236 {
1237 switch(family) {
1238 case AF_INET:
1239 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1240 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1241 break;
1242 case AF_INET6:
1243 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1244 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1245 break;
1246 }
1247 }
1248
1249 static __inline__ int
1250 __xfrm4_state_addr_check(const struct xfrm_state *x,
1251 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1252 {
1253 if (daddr->a4 == x->id.daddr.a4 &&
1254 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1255 return 1;
1256 return 0;
1257 }
1258
1259 static __inline__ int
1260 __xfrm6_state_addr_check(const struct xfrm_state *x,
1261 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1262 {
1263 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1264 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1265 ipv6_addr_any((struct in6_addr *)saddr) ||
1266 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1267 return 1;
1268 return 0;
1269 }
1270
1271 static __inline__ int
1272 xfrm_state_addr_check(const struct xfrm_state *x,
1273 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1274 unsigned short family)
1275 {
1276 switch (family) {
1277 case AF_INET:
1278 return __xfrm4_state_addr_check(x, daddr, saddr);
1279 case AF_INET6:
1280 return __xfrm6_state_addr_check(x, daddr, saddr);
1281 }
1282 return 0;
1283 }
1284
1285 static __inline__ int
1286 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1287 unsigned short family)
1288 {
1289 switch (family) {
1290 case AF_INET:
1291 return __xfrm4_state_addr_check(x,
1292 (const xfrm_address_t *)&fl->u.ip4.daddr,
1293 (const xfrm_address_t *)&fl->u.ip4.saddr);
1294 case AF_INET6:
1295 return __xfrm6_state_addr_check(x,
1296 (const xfrm_address_t *)&fl->u.ip6.daddr,
1297 (const xfrm_address_t *)&fl->u.ip6.saddr);
1298 }
1299 return 0;
1300 }
1301
1302 static inline int xfrm_state_kern(const struct xfrm_state *x)
1303 {
1304 return atomic_read(&x->tunnel_users);
1305 }
1306
1307 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1308 {
1309 return (!userproto || proto == userproto ||
1310 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1311 proto == IPPROTO_ESP ||
1312 proto == IPPROTO_COMP)));
1313 }
1314
1315 /*
1316 * xfrm algorithm information
1317 */
1318 struct xfrm_algo_aead_info {
1319 u16 icv_truncbits;
1320 };
1321
1322 struct xfrm_algo_auth_info {
1323 u16 icv_truncbits;
1324 u16 icv_fullbits;
1325 };
1326
1327 struct xfrm_algo_encr_info {
1328 u16 blockbits;
1329 u16 defkeybits;
1330 };
1331
1332 struct xfrm_algo_comp_info {
1333 u16 threshold;
1334 };
1335
1336 struct xfrm_algo_desc {
1337 char *name;
1338 char *compat;
1339 u8 available:1;
1340 u8 pfkey_supported:1;
1341 union {
1342 struct xfrm_algo_aead_info aead;
1343 struct xfrm_algo_auth_info auth;
1344 struct xfrm_algo_encr_info encr;
1345 struct xfrm_algo_comp_info comp;
1346 } uinfo;
1347 struct sadb_alg desc;
1348 };
1349
1350 /* XFRM tunnel handlers. */
1351 struct xfrm_tunnel {
1352 int (*handler)(struct sk_buff *skb);
1353 int (*err_handler)(struct sk_buff *skb, u32 info);
1354
1355 struct xfrm_tunnel __rcu *next;
1356 int priority;
1357 };
1358
1359 struct xfrm_tunnel_notifier {
1360 int (*handler)(struct sk_buff *skb);
1361 struct xfrm_tunnel_notifier __rcu *next;
1362 int priority;
1363 };
1364
1365 struct xfrm6_tunnel {
1366 int (*handler)(struct sk_buff *skb);
1367 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1368 u8 type, u8 code, int offset, __be32 info);
1369 struct xfrm6_tunnel __rcu *next;
1370 int priority;
1371 };
1372
1373 void xfrm_init(void);
1374 void xfrm4_init(void);
1375 int xfrm_state_init(struct net *net);
1376 void xfrm_state_fini(struct net *net);
1377 void xfrm4_state_init(void);
1378 #ifdef CONFIG_XFRM
1379 int xfrm6_init(void);
1380 void xfrm6_fini(void);
1381 int xfrm6_state_init(void);
1382 void xfrm6_state_fini(void);
1383 #else
1384 static inline int xfrm6_init(void)
1385 {
1386 return 0;
1387 }
1388 static inline void xfrm6_fini(void)
1389 {
1390 ;
1391 }
1392 #endif
1393
1394 #ifdef CONFIG_XFRM_STATISTICS
1395 int xfrm_proc_init(struct net *net);
1396 void xfrm_proc_fini(struct net *net);
1397 #endif
1398
1399 int xfrm_sysctl_init(struct net *net);
1400 #ifdef CONFIG_SYSCTL
1401 void xfrm_sysctl_fini(struct net *net);
1402 #else
1403 static inline void xfrm_sysctl_fini(struct net *net)
1404 {
1405 }
1406 #endif
1407
1408 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1409 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1410 int (*func)(struct xfrm_state *, int, void*), void *);
1411 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1412 struct xfrm_state *xfrm_state_alloc(struct net *net);
1413 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1414 const xfrm_address_t *saddr,
1415 const struct flowi *fl,
1416 struct xfrm_tmpl *tmpl,
1417 struct xfrm_policy *pol, int *err,
1418 unsigned short family);
1419 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1420 xfrm_address_t *daddr,
1421 xfrm_address_t *saddr,
1422 unsigned short family,
1423 u8 mode, u8 proto, u32 reqid);
1424 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1425 unsigned short family);
1426 int xfrm_state_check_expire(struct xfrm_state *x);
1427 void xfrm_state_insert(struct xfrm_state *x);
1428 int xfrm_state_add(struct xfrm_state *x);
1429 int xfrm_state_update(struct xfrm_state *x);
1430 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1431 const xfrm_address_t *daddr, __be32 spi,
1432 u8 proto, unsigned short family);
1433 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1434 const xfrm_address_t *daddr,
1435 const xfrm_address_t *saddr,
1436 u8 proto,
1437 unsigned short family);
1438 #ifdef CONFIG_XFRM_SUB_POLICY
1439 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1440 unsigned short family, struct net *net);
1441 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1442 unsigned short family);
1443 #else
1444 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1445 int n, unsigned short family, struct net *net)
1446 {
1447 return -ENOSYS;
1448 }
1449
1450 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1451 int n, unsigned short family)
1452 {
1453 return -ENOSYS;
1454 }
1455 #endif
1456
1457 struct xfrmk_sadinfo {
1458 u32 sadhcnt; /* current hash bkts */
1459 u32 sadhmcnt; /* max allowed hash bkts */
1460 u32 sadcnt; /* current running count */
1461 };
1462
1463 struct xfrmk_spdinfo {
1464 u32 incnt;
1465 u32 outcnt;
1466 u32 fwdcnt;
1467 u32 inscnt;
1468 u32 outscnt;
1469 u32 fwdscnt;
1470 u32 spdhcnt;
1471 u32 spdhmcnt;
1472 };
1473
1474 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1475 int xfrm_state_delete(struct xfrm_state *x);
1476 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1477 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1478 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1479 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1480 int xfrm_init_replay(struct xfrm_state *x);
1481 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1482 int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1483 int xfrm_init_state(struct xfrm_state *x);
1484 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1485 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1486 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1487 int xfrm_output_resume(struct sk_buff *skb, int err);
1488 int xfrm_output(struct sk_buff *skb);
1489 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1490 void xfrm_local_error(struct sk_buff *skb, int mtu);
1491 int xfrm4_extract_header(struct sk_buff *skb);
1492 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1493 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1494 int encap_type);
1495 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1496 int xfrm4_rcv(struct sk_buff *skb);
1497
1498 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1499 {
1500 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1501 }
1502
1503 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1504 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1505 int xfrm4_output(struct sk_buff *skb);
1506 int xfrm4_output_finish(struct sk_buff *skb);
1507 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1508 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1509 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1510 int xfrm4_mode_tunnel_input_register(struct xfrm_tunnel_notifier *handler);
1511 int xfrm4_mode_tunnel_input_deregister(struct xfrm_tunnel_notifier *handler);
1512 int xfrm6_mode_tunnel_input_register(struct xfrm_tunnel_notifier *handler);
1513 int xfrm6_mode_tunnel_input_deregister(struct xfrm_tunnel_notifier *handler);
1514 int xfrm6_extract_header(struct sk_buff *skb);
1515 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1516 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1517 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1518 int xfrm6_rcv(struct sk_buff *skb);
1519 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1520 xfrm_address_t *saddr, u8 proto);
1521 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1522 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1523 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1524 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1525 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1526 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1527 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1528 int xfrm6_output(struct sk_buff *skb);
1529 int xfrm6_output_finish(struct sk_buff *skb);
1530 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1531 u8 **prevhdr);
1532
1533 #ifdef CONFIG_XFRM
1534 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1535 int xfrm_user_policy(struct sock *sk, int optname,
1536 u8 __user *optval, int optlen);
1537 #else
1538 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1539 {
1540 return -ENOPROTOOPT;
1541 }
1542
1543 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1544 {
1545 /* should not happen */
1546 kfree_skb(skb);
1547 return 0;
1548 }
1549 #endif
1550
1551 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1552
1553 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1554 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1555 int (*func)(struct xfrm_policy *, int, int, void*),
1556 void *);
1557 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1558 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1559 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1560 u8 type, int dir,
1561 struct xfrm_selector *sel,
1562 struct xfrm_sec_ctx *ctx, int delete,
1563 int *err);
1564 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1565 u32 id, int delete, int *err);
1566 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1567 u32 xfrm_get_acqseq(void);
1568 int verify_spi_info(u8 proto, u32 min, u32 max);
1569 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1570 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1571 u8 mode, u32 reqid, u8 proto,
1572 const xfrm_address_t *daddr,
1573 const xfrm_address_t *saddr, int create,
1574 unsigned short family);
1575 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1576
1577 #ifdef CONFIG_XFRM_MIGRATE
1578 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1579 const struct xfrm_migrate *m, int num_bundles,
1580 const struct xfrm_kmaddress *k);
1581 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1582 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1583 struct xfrm_migrate *m);
1584 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1585 struct xfrm_migrate *m, int num_bundles,
1586 struct xfrm_kmaddress *k, struct net *net);
1587 #endif
1588
1589 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1590 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1591 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1592 xfrm_address_t *addr);
1593
1594 void xfrm_input_init(void);
1595 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1596
1597 void xfrm_probe_algs(void);
1598 int xfrm_count_pfkey_auth_supported(void);
1599 int xfrm_count_pfkey_enc_supported(void);
1600 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1601 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1602 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1603 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1604 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1605 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1606 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1607 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1608 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1609 int probe);
1610
1611 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1612 const xfrm_address_t *b)
1613 {
1614 return ipv6_addr_equal((const struct in6_addr *)a,
1615 (const struct in6_addr *)b);
1616 }
1617
1618 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1619 const xfrm_address_t *b,
1620 sa_family_t family)
1621 {
1622 switch (family) {
1623 default:
1624 case AF_INET:
1625 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1626 case AF_INET6:
1627 return xfrm6_addr_equal(a, b);
1628 }
1629 }
1630
1631 static inline int xfrm_policy_id2dir(u32 index)
1632 {
1633 return index & 7;
1634 }
1635
1636 #ifdef CONFIG_XFRM
1637 static inline int xfrm_aevent_is_on(struct net *net)
1638 {
1639 struct sock *nlsk;
1640 int ret = 0;
1641
1642 rcu_read_lock();
1643 nlsk = rcu_dereference(net->xfrm.nlsk);
1644 if (nlsk)
1645 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1646 rcu_read_unlock();
1647 return ret;
1648 }
1649 #endif
1650
1651 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1652 {
1653 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1654 }
1655
1656 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1657 {
1658 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1659 }
1660
1661 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1662 {
1663 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1664 }
1665
1666 #ifdef CONFIG_XFRM_MIGRATE
1667 static inline int xfrm_replay_clone(struct xfrm_state *x,
1668 struct xfrm_state *orig)
1669 {
1670 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1671 GFP_KERNEL);
1672 if (!x->replay_esn)
1673 return -ENOMEM;
1674
1675 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1676 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1677
1678 x->preplay_esn = kmemdup(x->replay_esn,
1679 xfrm_replay_state_esn_len(x->replay_esn),
1680 GFP_KERNEL);
1681 if (!x->preplay_esn) {
1682 kfree(x->replay_esn);
1683 return -ENOMEM;
1684 }
1685
1686 return 0;
1687 }
1688
1689 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1690 {
1691 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1692 }
1693
1694 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1695 {
1696 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1697 }
1698
1699 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1700 {
1701 int i;
1702 for (i = 0; i < n; i++)
1703 xfrm_state_put(*(states + i));
1704 }
1705
1706 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1707 {
1708 int i;
1709 for (i = 0; i < n; i++)
1710 xfrm_state_delete(*(states + i));
1711 }
1712 #endif
1713
1714 #ifdef CONFIG_XFRM
1715 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1716 {
1717 return skb->sp->xvec[skb->sp->len - 1];
1718 }
1719 #endif
1720
1721 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1722 {
1723 if (attrs[XFRMA_MARK])
1724 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1725 else
1726 m->v = m->m = 0;
1727
1728 return m->v & m->m;
1729 }
1730
1731 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1732 {
1733 int ret = 0;
1734
1735 if (m->m | m->v)
1736 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1737 return ret;
1738 }
1739
1740 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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