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