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inet: constify ip headers and in6_addr
[deliverable/linux.git] / include / net / xfrm.h
1 #ifndef _NET_XFRM_H
2 #define _NET_XFRM_H
3
4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
15 #include <linux/slab.h>
16
17 #include <net/sock.h>
18 #include <net/dst.h>
19 #include <net/ip.h>
20 #include <net/route.h>
21 #include <net/ipv6.h>
22 #include <net/ip6_fib.h>
23 #include <net/flow.h>
24
25 #include <linux/interrupt.h>
26
27 #ifdef CONFIG_XFRM_STATISTICS
28 #include <net/snmp.h>
29 #endif
30
31 #define XFRM_PROTO_ESP 50
32 #define XFRM_PROTO_AH 51
33 #define XFRM_PROTO_COMP 108
34 #define XFRM_PROTO_IPIP 4
35 #define XFRM_PROTO_IPV6 41
36 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46 #ifdef CONFIG_XFRM_STATISTICS
47 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50 #else
51 #define XFRM_INC_STATS(net, field) ((void)(net))
52 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
53 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
54 #endif
55
56 extern struct mutex xfrm_cfg_mutex;
57
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119 struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 union {
123 u8 dying;
124 u8 proto;
125 };
126 u32 seq;
127 };
128
129 /* Full description of state of transformer. */
130 struct xfrm_state {
131 #ifdef CONFIG_NET_NS
132 struct net *xs_net;
133 #endif
134 union {
135 struct hlist_node gclist;
136 struct hlist_node bydst;
137 };
138 struct hlist_node bysrc;
139 struct hlist_node byspi;
140
141 atomic_t refcnt;
142 spinlock_t lock;
143
144 struct xfrm_id id;
145 struct xfrm_selector sel;
146 struct xfrm_mark mark;
147 u32 tfcpad;
148
149 u32 genid;
150
151 /* Key manager bits */
152 struct xfrm_state_walk km;
153
154 /* Parameters of this state. */
155 struct {
156 u32 reqid;
157 u8 mode;
158 u8 replay_window;
159 u8 aalgo, ealgo, calgo;
160 u8 flags;
161 u16 family;
162 xfrm_address_t saddr;
163 int header_len;
164 int trailer_len;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo_auth *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189 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 /* Last used time */
217 unsigned long lastused;
218
219 /* Reference to data common to all the instances of this
220 * transformer. */
221 const struct xfrm_type *type;
222 struct xfrm_mode *inner_mode;
223 struct xfrm_mode *inner_mode_iaf;
224 struct xfrm_mode *outer_mode;
225
226 /* Security context */
227 struct xfrm_sec_ctx *security;
228
229 /* Private data of this transformer, format is opaque,
230 * interpreted by xfrm_type methods. */
231 void *data;
232 };
233
234 static inline struct net *xs_net(struct xfrm_state *x)
235 {
236 return read_pnet(&x->xs_net);
237 }
238
239 /* xflags - make enum if more show up */
240 #define XFRM_TIME_DEFER 1
241
242 enum {
243 XFRM_STATE_VOID,
244 XFRM_STATE_ACQ,
245 XFRM_STATE_VALID,
246 XFRM_STATE_ERROR,
247 XFRM_STATE_EXPIRED,
248 XFRM_STATE_DEAD
249 };
250
251 /* callback structure passed from either netlink or pfkey */
252 struct km_event {
253 union {
254 u32 hard;
255 u32 proto;
256 u32 byid;
257 u32 aevent;
258 u32 type;
259 } data;
260
261 u32 seq;
262 u32 pid;
263 u32 event;
264 struct net *net;
265 };
266
267 struct xfrm_replay {
268 void (*advance)(struct xfrm_state *x, __be32 net_seq);
269 int (*check)(struct xfrm_state *x,
270 struct sk_buff *skb,
271 __be32 net_seq);
272 void (*notify)(struct xfrm_state *x, int event);
273 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
274 };
275
276 struct net_device;
277 struct xfrm_type;
278 struct xfrm_dst;
279 struct xfrm_policy_afinfo {
280 unsigned short family;
281 struct dst_ops *dst_ops;
282 void (*garbage_collect)(struct net *net);
283 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
284 const xfrm_address_t *saddr,
285 const xfrm_address_t *daddr);
286 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
287 void (*decode_session)(struct sk_buff *skb,
288 struct flowi *fl,
289 int reverse);
290 int (*get_tos)(const struct flowi *fl);
291 int (*init_path)(struct xfrm_dst *path,
292 struct dst_entry *dst,
293 int nfheader_len);
294 int (*fill_dst)(struct xfrm_dst *xdst,
295 struct net_device *dev,
296 const struct flowi *fl);
297 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
298 };
299
300 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
301 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
302 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
303 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
304
305 struct xfrm_tmpl;
306 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
307 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
308 extern int __xfrm_state_delete(struct xfrm_state *x);
309
310 struct xfrm_state_afinfo {
311 unsigned int family;
312 unsigned int proto;
313 __be16 eth_proto;
314 struct module *owner;
315 const struct xfrm_type *type_map[IPPROTO_MAX];
316 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
317 int (*init_flags)(struct xfrm_state *x);
318 void (*init_tempsel)(struct xfrm_selector *sel,
319 const struct flowi *fl);
320 void (*init_temprop)(struct xfrm_state *x,
321 const struct xfrm_tmpl *tmpl,
322 const xfrm_address_t *daddr,
323 const xfrm_address_t *saddr);
324 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
325 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
326 int (*output)(struct sk_buff *skb);
327 int (*extract_input)(struct xfrm_state *x,
328 struct sk_buff *skb);
329 int (*extract_output)(struct xfrm_state *x,
330 struct sk_buff *skb);
331 int (*transport_finish)(struct sk_buff *skb,
332 int async);
333 };
334
335 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
336 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
337
338 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
339
340 struct xfrm_type {
341 char *description;
342 struct module *owner;
343 u8 proto;
344 u8 flags;
345 #define XFRM_TYPE_NON_FRAGMENT 1
346 #define XFRM_TYPE_REPLAY_PROT 2
347 #define XFRM_TYPE_LOCAL_COADDR 4
348 #define XFRM_TYPE_REMOTE_COADDR 8
349
350 int (*init_state)(struct xfrm_state *x);
351 void (*destructor)(struct xfrm_state *);
352 int (*input)(struct xfrm_state *, struct sk_buff *skb);
353 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
354 int (*reject)(struct xfrm_state *, struct sk_buff *,
355 const struct flowi *);
356 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
357 /* Estimate maximal size of result of transformation of a dgram */
358 u32 (*get_mtu)(struct xfrm_state *, int size);
359 };
360
361 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
362 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
363
364 struct xfrm_mode {
365 /*
366 * Remove encapsulation header.
367 *
368 * The IP header will be moved over the top of the encapsulation
369 * header.
370 *
371 * On entry, the transport header shall point to where the IP header
372 * should be and the network header shall be set to where the IP
373 * header currently is. skb->data shall point to the start of the
374 * payload.
375 */
376 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
377
378 /*
379 * This is the actual input entry point.
380 *
381 * For transport mode and equivalent this would be identical to
382 * input2 (which does not need to be set). While tunnel mode
383 * and equivalent would set this to the tunnel encapsulation function
384 * xfrm4_prepare_input that would in turn call input2.
385 */
386 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
387
388 /*
389 * Add encapsulation header.
390 *
391 * On exit, the transport header will be set to the start of the
392 * encapsulation header to be filled in by x->type->output and
393 * the mac header will be set to the nextheader (protocol for
394 * IPv4) field of the extension header directly preceding the
395 * encapsulation header, or in its absence, that of the top IP
396 * header. The value of the network header will always point
397 * to the top IP header while skb->data will point to the payload.
398 */
399 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
400
401 /*
402 * This is the actual output entry point.
403 *
404 * For transport mode and equivalent this would be identical to
405 * output2 (which does not need to be set). While tunnel mode
406 * and equivalent would set this to a tunnel encapsulation function
407 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
408 * call output2.
409 */
410 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
411
412 struct xfrm_state_afinfo *afinfo;
413 struct module *owner;
414 unsigned int encap;
415 int flags;
416 };
417
418 /* Flags for xfrm_mode. */
419 enum {
420 XFRM_MODE_FLAG_TUNNEL = 1,
421 };
422
423 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
424 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
425
426 static inline int xfrm_af2proto(unsigned int family)
427 {
428 switch(family) {
429 case AF_INET:
430 return IPPROTO_IPIP;
431 case AF_INET6:
432 return IPPROTO_IPV6;
433 default:
434 return 0;
435 }
436 }
437
438 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
439 {
440 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
441 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
442 return x->inner_mode;
443 else
444 return x->inner_mode_iaf;
445 }
446
447 struct xfrm_tmpl {
448 /* id in template is interpreted as:
449 * daddr - destination of tunnel, may be zero for transport mode.
450 * spi - zero to acquire spi. Not zero if spi is static, then
451 * daddr must be fixed too.
452 * proto - AH/ESP/IPCOMP
453 */
454 struct xfrm_id id;
455
456 /* Source address of tunnel. Ignored, if it is not a tunnel. */
457 xfrm_address_t saddr;
458
459 unsigned short encap_family;
460
461 u32 reqid;
462
463 /* Mode: transport, tunnel etc. */
464 u8 mode;
465
466 /* Sharing mode: unique, this session only, this user only etc. */
467 u8 share;
468
469 /* May skip this transfomration if no SA is found */
470 u8 optional;
471
472 /* Skip aalgos/ealgos/calgos checks. */
473 u8 allalgs;
474
475 /* Bit mask of algos allowed for acquisition */
476 u32 aalgos;
477 u32 ealgos;
478 u32 calgos;
479 };
480
481 #define XFRM_MAX_DEPTH 6
482
483 struct xfrm_policy_walk_entry {
484 struct list_head all;
485 u8 dead;
486 };
487
488 struct xfrm_policy_walk {
489 struct xfrm_policy_walk_entry walk;
490 u8 type;
491 u32 seq;
492 };
493
494 struct xfrm_policy {
495 #ifdef CONFIG_NET_NS
496 struct net *xp_net;
497 #endif
498 struct hlist_node bydst;
499 struct hlist_node byidx;
500
501 /* This lock only affects elements except for entry. */
502 rwlock_t lock;
503 atomic_t refcnt;
504 struct timer_list timer;
505
506 struct flow_cache_object flo;
507 atomic_t genid;
508 u32 priority;
509 u32 index;
510 struct xfrm_mark mark;
511 struct xfrm_selector selector;
512 struct xfrm_lifetime_cfg lft;
513 struct xfrm_lifetime_cur curlft;
514 struct xfrm_policy_walk_entry walk;
515 u8 type;
516 u8 action;
517 u8 flags;
518 u8 xfrm_nr;
519 u16 family;
520 struct xfrm_sec_ctx *security;
521 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
522 };
523
524 static inline struct net *xp_net(const struct xfrm_policy *xp)
525 {
526 return read_pnet(&xp->xp_net);
527 }
528
529 struct xfrm_kmaddress {
530 xfrm_address_t local;
531 xfrm_address_t remote;
532 u32 reserved;
533 u16 family;
534 };
535
536 struct xfrm_migrate {
537 xfrm_address_t old_daddr;
538 xfrm_address_t old_saddr;
539 xfrm_address_t new_daddr;
540 xfrm_address_t new_saddr;
541 u8 proto;
542 u8 mode;
543 u16 reserved;
544 u32 reqid;
545 u16 old_family;
546 u16 new_family;
547 };
548
549 #define XFRM_KM_TIMEOUT 30
550 /* which seqno */
551 #define XFRM_REPLAY_SEQ 1
552 #define XFRM_REPLAY_OSEQ 2
553 #define XFRM_REPLAY_SEQ_MASK 3
554 /* what happened */
555 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
556 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
557
558 /* default aevent timeout in units of 100ms */
559 #define XFRM_AE_ETIME 10
560 /* Async Event timer multiplier */
561 #define XFRM_AE_ETH_M 10
562 /* default seq threshold size */
563 #define XFRM_AE_SEQT_SIZE 2
564
565 struct xfrm_mgr {
566 struct list_head list;
567 char *id;
568 int (*notify)(struct xfrm_state *x, const struct km_event *c);
569 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
570 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
571 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
572 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
573 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
574 int (*migrate)(const struct xfrm_selector *sel,
575 u8 dir, u8 type,
576 const struct xfrm_migrate *m,
577 int num_bundles,
578 const struct xfrm_kmaddress *k);
579 };
580
581 extern int xfrm_register_km(struct xfrm_mgr *km);
582 extern int xfrm_unregister_km(struct xfrm_mgr *km);
583
584 /*
585 * This structure is used for the duration where packets are being
586 * transformed by IPsec. As soon as the packet leaves IPsec the
587 * area beyond the generic IP part may be overwritten.
588 */
589 struct xfrm_skb_cb {
590 union {
591 struct inet_skb_parm h4;
592 struct inet6_skb_parm h6;
593 } header;
594
595 /* Sequence number for replay protection. */
596 union {
597 struct {
598 __u32 low;
599 __u32 hi;
600 } output;
601 struct {
602 __be32 low;
603 __be32 hi;
604 } input;
605 } seq;
606 };
607
608 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
609
610 /*
611 * This structure is used by the afinfo prepare_input/prepare_output functions
612 * to transmit header information to the mode input/output functions.
613 */
614 struct xfrm_mode_skb_cb {
615 union {
616 struct inet_skb_parm h4;
617 struct inet6_skb_parm h6;
618 } header;
619
620 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
621 __be16 id;
622 __be16 frag_off;
623
624 /* IP header length (excluding options or extension headers). */
625 u8 ihl;
626
627 /* TOS for IPv4, class for IPv6. */
628 u8 tos;
629
630 /* TTL for IPv4, hop limitfor IPv6. */
631 u8 ttl;
632
633 /* Protocol for IPv4, NH for IPv6. */
634 u8 protocol;
635
636 /* Option length for IPv4, zero for IPv6. */
637 u8 optlen;
638
639 /* Used by IPv6 only, zero for IPv4. */
640 u8 flow_lbl[3];
641 };
642
643 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
644
645 /*
646 * This structure is used by the input processing to locate the SPI and
647 * related information.
648 */
649 struct xfrm_spi_skb_cb {
650 union {
651 struct inet_skb_parm h4;
652 struct inet6_skb_parm h6;
653 } header;
654
655 unsigned int daddroff;
656 unsigned int family;
657 };
658
659 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
660
661 /* Audit Information */
662 struct xfrm_audit {
663 u32 secid;
664 uid_t loginuid;
665 u32 sessionid;
666 };
667
668 #ifdef CONFIG_AUDITSYSCALL
669 static inline struct audit_buffer *xfrm_audit_start(const char *op)
670 {
671 struct audit_buffer *audit_buf = NULL;
672
673 if (audit_enabled == 0)
674 return NULL;
675 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
676 AUDIT_MAC_IPSEC_EVENT);
677 if (audit_buf == NULL)
678 return NULL;
679 audit_log_format(audit_buf, "op=%s", op);
680 return audit_buf;
681 }
682
683 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
684 struct audit_buffer *audit_buf)
685 {
686 char *secctx;
687 u32 secctx_len;
688
689 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
690 if (secid != 0 &&
691 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
692 audit_log_format(audit_buf, " subj=%s", secctx);
693 security_release_secctx(secctx, secctx_len);
694 } else
695 audit_log_task_context(audit_buf);
696 }
697
698 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
699 u32 auid, u32 ses, u32 secid);
700 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
701 u32 auid, u32 ses, u32 secid);
702 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
703 u32 auid, u32 ses, u32 secid);
704 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
705 u32 auid, u32 ses, u32 secid);
706 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
707 struct sk_buff *skb);
708 extern void xfrm_audit_state_replay(struct xfrm_state *x,
709 struct sk_buff *skb, __be32 net_seq);
710 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
711 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
712 __be32 net_spi, __be32 net_seq);
713 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
714 struct sk_buff *skb, u8 proto);
715 #else
716
717 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
718 u32 auid, u32 ses, u32 secid)
719 {
720 }
721
722 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
723 u32 auid, u32 ses, u32 secid)
724 {
725 }
726
727 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
728 u32 auid, u32 ses, u32 secid)
729 {
730 }
731
732 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
733 u32 auid, u32 ses, u32 secid)
734 {
735 }
736
737 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
738 struct sk_buff *skb)
739 {
740 }
741
742 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
743 struct sk_buff *skb, __be32 net_seq)
744 {
745 }
746
747 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
748 u16 family)
749 {
750 }
751
752 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
753 __be32 net_spi, __be32 net_seq)
754 {
755 }
756
757 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
758 struct sk_buff *skb, u8 proto)
759 {
760 }
761 #endif /* CONFIG_AUDITSYSCALL */
762
763 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
764 {
765 if (likely(policy != NULL))
766 atomic_inc(&policy->refcnt);
767 }
768
769 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
770
771 static inline void xfrm_pol_put(struct xfrm_policy *policy)
772 {
773 if (atomic_dec_and_test(&policy->refcnt))
774 xfrm_policy_destroy(policy);
775 }
776
777 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
778 {
779 int i;
780 for (i = npols - 1; i >= 0; --i)
781 xfrm_pol_put(pols[i]);
782 }
783
784 extern void __xfrm_state_destroy(struct xfrm_state *);
785
786 static inline void __xfrm_state_put(struct xfrm_state *x)
787 {
788 atomic_dec(&x->refcnt);
789 }
790
791 static inline void xfrm_state_put(struct xfrm_state *x)
792 {
793 if (atomic_dec_and_test(&x->refcnt))
794 __xfrm_state_destroy(x);
795 }
796
797 static inline void xfrm_state_hold(struct xfrm_state *x)
798 {
799 atomic_inc(&x->refcnt);
800 }
801
802 static inline bool addr_match(const void *token1, const void *token2,
803 int prefixlen)
804 {
805 const __be32 *a1 = token1;
806 const __be32 *a2 = token2;
807 int pdw;
808 int pbi;
809
810 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
811 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
812
813 if (pdw)
814 if (memcmp(a1, a2, pdw << 2))
815 return false;
816
817 if (pbi) {
818 __be32 mask;
819
820 mask = htonl((0xffffffff) << (32 - pbi));
821
822 if ((a1[pdw] ^ a2[pdw]) & mask)
823 return false;
824 }
825
826 return true;
827 }
828
829 static __inline__
830 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
831 {
832 __be16 port;
833 switch(fl->flowi_proto) {
834 case IPPROTO_TCP:
835 case IPPROTO_UDP:
836 case IPPROTO_UDPLITE:
837 case IPPROTO_SCTP:
838 port = uli->ports.sport;
839 break;
840 case IPPROTO_ICMP:
841 case IPPROTO_ICMPV6:
842 port = htons(uli->icmpt.type);
843 break;
844 case IPPROTO_MH:
845 port = htons(uli->mht.type);
846 break;
847 case IPPROTO_GRE:
848 port = htons(ntohl(uli->gre_key) >> 16);
849 break;
850 default:
851 port = 0; /*XXX*/
852 }
853 return port;
854 }
855
856 static __inline__
857 __be16 xfrm_flowi_dport(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.dport;
866 break;
867 case IPPROTO_ICMP:
868 case IPPROTO_ICMPV6:
869 port = htons(uli->icmpt.code);
870 break;
871 case IPPROTO_GRE:
872 port = htons(ntohl(uli->gre_key) & 0xffff);
873 break;
874 default:
875 port = 0; /*XXX*/
876 }
877 return port;
878 }
879
880 extern int xfrm_selector_match(const struct xfrm_selector *sel,
881 const struct flowi *fl,
882 unsigned short family);
883
884 #ifdef CONFIG_SECURITY_NETWORK_XFRM
885 /* If neither has a context --> match
886 * Otherwise, both must have a context and the sids, doi, alg must match
887 */
888 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
889 {
890 return ((!s1 && !s2) ||
891 (s1 && s2 &&
892 (s1->ctx_sid == s2->ctx_sid) &&
893 (s1->ctx_doi == s2->ctx_doi) &&
894 (s1->ctx_alg == s2->ctx_alg)));
895 }
896 #else
897 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
898 {
899 return 1;
900 }
901 #endif
902
903 /* A struct encoding bundle of transformations to apply to some set of flow.
904 *
905 * dst->child points to the next element of bundle.
906 * dst->xfrm points to an instanse of transformer.
907 *
908 * Due to unfortunate limitations of current routing cache, which we
909 * have no time to fix, it mirrors struct rtable and bound to the same
910 * routing key, including saddr,daddr. However, we can have many of
911 * bundles differing by session id. All the bundles grow from a parent
912 * policy rule.
913 */
914 struct xfrm_dst {
915 union {
916 struct dst_entry dst;
917 struct rtable rt;
918 struct rt6_info rt6;
919 } u;
920 struct dst_entry *route;
921 struct flow_cache_object flo;
922 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
923 int num_pols, num_xfrms;
924 #ifdef CONFIG_XFRM_SUB_POLICY
925 struct flowi *origin;
926 struct xfrm_selector *partner;
927 #endif
928 u32 xfrm_genid;
929 u32 policy_genid;
930 u32 route_mtu_cached;
931 u32 child_mtu_cached;
932 u32 route_cookie;
933 u32 path_cookie;
934 };
935
936 #ifdef CONFIG_XFRM
937 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
938 {
939 xfrm_pols_put(xdst->pols, xdst->num_pols);
940 dst_release(xdst->route);
941 if (likely(xdst->u.dst.xfrm))
942 xfrm_state_put(xdst->u.dst.xfrm);
943 #ifdef CONFIG_XFRM_SUB_POLICY
944 kfree(xdst->origin);
945 xdst->origin = NULL;
946 kfree(xdst->partner);
947 xdst->partner = NULL;
948 #endif
949 }
950 #endif
951
952 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
953
954 struct sec_path {
955 atomic_t refcnt;
956 int len;
957 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
958 };
959
960 static inline int secpath_exists(struct sk_buff *skb)
961 {
962 #ifdef CONFIG_XFRM
963 return skb->sp != NULL;
964 #else
965 return 0;
966 #endif
967 }
968
969 static inline struct sec_path *
970 secpath_get(struct sec_path *sp)
971 {
972 if (sp)
973 atomic_inc(&sp->refcnt);
974 return sp;
975 }
976
977 extern void __secpath_destroy(struct sec_path *sp);
978
979 static inline void
980 secpath_put(struct sec_path *sp)
981 {
982 if (sp && atomic_dec_and_test(&sp->refcnt))
983 __secpath_destroy(sp);
984 }
985
986 extern struct sec_path *secpath_dup(struct sec_path *src);
987
988 static inline void
989 secpath_reset(struct sk_buff *skb)
990 {
991 #ifdef CONFIG_XFRM
992 secpath_put(skb->sp);
993 skb->sp = NULL;
994 #endif
995 }
996
997 static inline int
998 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
999 {
1000 switch (family) {
1001 case AF_INET:
1002 return addr->a4 == 0;
1003 case AF_INET6:
1004 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1005 }
1006 return 0;
1007 }
1008
1009 static inline int
1010 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1011 {
1012 return (tmpl->saddr.a4 &&
1013 tmpl->saddr.a4 != x->props.saddr.a4);
1014 }
1015
1016 static inline int
1017 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1018 {
1019 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1020 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1021 }
1022
1023 static inline int
1024 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1025 {
1026 switch (family) {
1027 case AF_INET:
1028 return __xfrm4_state_addr_cmp(tmpl, x);
1029 case AF_INET6:
1030 return __xfrm6_state_addr_cmp(tmpl, x);
1031 }
1032 return !0;
1033 }
1034
1035 #ifdef CONFIG_XFRM
1036 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1037
1038 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1039 struct sk_buff *skb,
1040 unsigned int family, int reverse)
1041 {
1042 struct net *net = dev_net(skb->dev);
1043 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1044
1045 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1046 return __xfrm_policy_check(sk, ndir, skb, family);
1047
1048 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1049 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1050 __xfrm_policy_check(sk, ndir, skb, family);
1051 }
1052
1053 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1054 {
1055 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1056 }
1057
1058 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1059 {
1060 return xfrm_policy_check(sk, dir, skb, AF_INET);
1061 }
1062
1063 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1064 {
1065 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1066 }
1067
1068 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1069 struct sk_buff *skb)
1070 {
1071 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1072 }
1073
1074 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1075 struct sk_buff *skb)
1076 {
1077 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1078 }
1079
1080 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1081 unsigned int family, int reverse);
1082
1083 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1084 unsigned int family)
1085 {
1086 return __xfrm_decode_session(skb, fl, family, 0);
1087 }
1088
1089 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1090 struct flowi *fl,
1091 unsigned int family)
1092 {
1093 return __xfrm_decode_session(skb, fl, family, 1);
1094 }
1095
1096 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1097
1098 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1099 {
1100 struct net *net = dev_net(skb->dev);
1101
1102 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1103 (skb_dst(skb)->flags & DST_NOXFRM) ||
1104 __xfrm_route_forward(skb, family);
1105 }
1106
1107 static inline int xfrm4_route_forward(struct sk_buff *skb)
1108 {
1109 return xfrm_route_forward(skb, AF_INET);
1110 }
1111
1112 static inline int xfrm6_route_forward(struct sk_buff *skb)
1113 {
1114 return xfrm_route_forward(skb, AF_INET6);
1115 }
1116
1117 extern int __xfrm_sk_clone_policy(struct sock *sk);
1118
1119 static inline int xfrm_sk_clone_policy(struct sock *sk)
1120 {
1121 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1122 return __xfrm_sk_clone_policy(sk);
1123 return 0;
1124 }
1125
1126 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1127
1128 static inline void xfrm_sk_free_policy(struct sock *sk)
1129 {
1130 if (unlikely(sk->sk_policy[0] != NULL)) {
1131 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1132 sk->sk_policy[0] = NULL;
1133 }
1134 if (unlikely(sk->sk_policy[1] != NULL)) {
1135 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1136 sk->sk_policy[1] = NULL;
1137 }
1138 }
1139
1140 #else
1141
1142 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1143 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1144 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1145 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1146 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1147 {
1148 return 1;
1149 }
1150 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1151 {
1152 return 1;
1153 }
1154 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1155 {
1156 return 1;
1157 }
1158 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1159 struct flowi *fl,
1160 unsigned int family)
1161 {
1162 return -ENOSYS;
1163 }
1164 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1165 struct sk_buff *skb)
1166 {
1167 return 1;
1168 }
1169 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1170 struct sk_buff *skb)
1171 {
1172 return 1;
1173 }
1174 #endif
1175
1176 static __inline__
1177 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1178 {
1179 switch (family){
1180 case AF_INET:
1181 return (xfrm_address_t *)&fl->u.ip4.daddr;
1182 case AF_INET6:
1183 return (xfrm_address_t *)&fl->u.ip6.daddr;
1184 }
1185 return NULL;
1186 }
1187
1188 static __inline__
1189 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1190 {
1191 switch (family){
1192 case AF_INET:
1193 return (xfrm_address_t *)&fl->u.ip4.saddr;
1194 case AF_INET6:
1195 return (xfrm_address_t *)&fl->u.ip6.saddr;
1196 }
1197 return NULL;
1198 }
1199
1200 static __inline__
1201 void xfrm_flowi_addr_get(const struct flowi *fl,
1202 xfrm_address_t *saddr, xfrm_address_t *daddr,
1203 unsigned short family)
1204 {
1205 switch(family) {
1206 case AF_INET:
1207 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1208 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1209 break;
1210 case AF_INET6:
1211 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->u.ip6.saddr);
1212 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->u.ip6.daddr);
1213 break;
1214 }
1215 }
1216
1217 static __inline__ int
1218 __xfrm4_state_addr_check(const struct xfrm_state *x,
1219 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1220 {
1221 if (daddr->a4 == x->id.daddr.a4 &&
1222 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1223 return 1;
1224 return 0;
1225 }
1226
1227 static __inline__ int
1228 __xfrm6_state_addr_check(const struct xfrm_state *x,
1229 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1230 {
1231 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1232 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1233 ipv6_addr_any((struct in6_addr *)saddr) ||
1234 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1235 return 1;
1236 return 0;
1237 }
1238
1239 static __inline__ int
1240 xfrm_state_addr_check(const struct xfrm_state *x,
1241 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1242 unsigned short family)
1243 {
1244 switch (family) {
1245 case AF_INET:
1246 return __xfrm4_state_addr_check(x, daddr, saddr);
1247 case AF_INET6:
1248 return __xfrm6_state_addr_check(x, daddr, saddr);
1249 }
1250 return 0;
1251 }
1252
1253 static __inline__ int
1254 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1255 unsigned short family)
1256 {
1257 switch (family) {
1258 case AF_INET:
1259 return __xfrm4_state_addr_check(x,
1260 (const xfrm_address_t *)&fl->u.ip4.daddr,
1261 (const xfrm_address_t *)&fl->u.ip4.saddr);
1262 case AF_INET6:
1263 return __xfrm6_state_addr_check(x,
1264 (const xfrm_address_t *)&fl->u.ip6.daddr,
1265 (const xfrm_address_t *)&fl->u.ip6.saddr);
1266 }
1267 return 0;
1268 }
1269
1270 static inline int xfrm_state_kern(const struct xfrm_state *x)
1271 {
1272 return atomic_read(&x->tunnel_users);
1273 }
1274
1275 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1276 {
1277 return (!userproto || proto == userproto ||
1278 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1279 proto == IPPROTO_ESP ||
1280 proto == IPPROTO_COMP)));
1281 }
1282
1283 /*
1284 * xfrm algorithm information
1285 */
1286 struct xfrm_algo_aead_info {
1287 u16 icv_truncbits;
1288 };
1289
1290 struct xfrm_algo_auth_info {
1291 u16 icv_truncbits;
1292 u16 icv_fullbits;
1293 };
1294
1295 struct xfrm_algo_encr_info {
1296 u16 blockbits;
1297 u16 defkeybits;
1298 };
1299
1300 struct xfrm_algo_comp_info {
1301 u16 threshold;
1302 };
1303
1304 struct xfrm_algo_desc {
1305 char *name;
1306 char *compat;
1307 u8 available:1;
1308 union {
1309 struct xfrm_algo_aead_info aead;
1310 struct xfrm_algo_auth_info auth;
1311 struct xfrm_algo_encr_info encr;
1312 struct xfrm_algo_comp_info comp;
1313 } uinfo;
1314 struct sadb_alg desc;
1315 };
1316
1317 /* XFRM tunnel handlers. */
1318 struct xfrm_tunnel {
1319 int (*handler)(struct sk_buff *skb);
1320 int (*err_handler)(struct sk_buff *skb, u32 info);
1321
1322 struct xfrm_tunnel __rcu *next;
1323 int priority;
1324 };
1325
1326 struct xfrm6_tunnel {
1327 int (*handler)(struct sk_buff *skb);
1328 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1329 u8 type, u8 code, int offset, __be32 info);
1330 struct xfrm6_tunnel __rcu *next;
1331 int priority;
1332 };
1333
1334 extern void xfrm_init(void);
1335 extern void xfrm4_init(int rt_hash_size);
1336 extern int xfrm_state_init(struct net *net);
1337 extern void xfrm_state_fini(struct net *net);
1338 extern void xfrm4_state_init(void);
1339 #ifdef CONFIG_XFRM
1340 extern int xfrm6_init(void);
1341 extern void xfrm6_fini(void);
1342 extern int xfrm6_state_init(void);
1343 extern void xfrm6_state_fini(void);
1344 #else
1345 static inline int xfrm6_init(void)
1346 {
1347 return 0;
1348 }
1349 static inline void xfrm6_fini(void)
1350 {
1351 ;
1352 }
1353 #endif
1354
1355 #ifdef CONFIG_XFRM_STATISTICS
1356 extern int xfrm_proc_init(struct net *net);
1357 extern void xfrm_proc_fini(struct net *net);
1358 #endif
1359
1360 extern int xfrm_sysctl_init(struct net *net);
1361 #ifdef CONFIG_SYSCTL
1362 extern void xfrm_sysctl_fini(struct net *net);
1363 #else
1364 static inline void xfrm_sysctl_fini(struct net *net)
1365 {
1366 }
1367 #endif
1368
1369 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1370 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1371 int (*func)(struct xfrm_state *, int, void*), void *);
1372 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1373 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1374 extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1375 const xfrm_address_t *saddr,
1376 const struct flowi *fl,
1377 struct xfrm_tmpl *tmpl,
1378 struct xfrm_policy *pol, int *err,
1379 unsigned short family);
1380 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1381 xfrm_address_t *daddr,
1382 xfrm_address_t *saddr,
1383 unsigned short family,
1384 u8 mode, u8 proto, u32 reqid);
1385 extern int xfrm_state_check_expire(struct xfrm_state *x);
1386 extern void xfrm_state_insert(struct xfrm_state *x);
1387 extern int xfrm_state_add(struct xfrm_state *x);
1388 extern int xfrm_state_update(struct xfrm_state *x);
1389 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1390 const xfrm_address_t *daddr, __be32 spi,
1391 u8 proto, unsigned short family);
1392 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1393 const xfrm_address_t *daddr,
1394 const xfrm_address_t *saddr,
1395 u8 proto,
1396 unsigned short family);
1397 #ifdef CONFIG_XFRM_SUB_POLICY
1398 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1399 int n, unsigned short family);
1400 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1401 int n, unsigned short family);
1402 #else
1403 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1404 int n, unsigned short family)
1405 {
1406 return -ENOSYS;
1407 }
1408
1409 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1410 int n, unsigned short family)
1411 {
1412 return -ENOSYS;
1413 }
1414 #endif
1415
1416 struct xfrmk_sadinfo {
1417 u32 sadhcnt; /* current hash bkts */
1418 u32 sadhmcnt; /* max allowed hash bkts */
1419 u32 sadcnt; /* current running count */
1420 };
1421
1422 struct xfrmk_spdinfo {
1423 u32 incnt;
1424 u32 outcnt;
1425 u32 fwdcnt;
1426 u32 inscnt;
1427 u32 outscnt;
1428 u32 fwdscnt;
1429 u32 spdhcnt;
1430 u32 spdhmcnt;
1431 };
1432
1433 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1434 u32 seq);
1435 extern int xfrm_state_delete(struct xfrm_state *x);
1436 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1437 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1438 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1439 extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1440 extern int xfrm_init_replay(struct xfrm_state *x);
1441 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1442 extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1443 extern int xfrm_init_state(struct xfrm_state *x);
1444 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1445 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1446 int encap_type);
1447 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1448 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1449 extern int xfrm_output(struct sk_buff *skb);
1450 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1451 extern int xfrm4_extract_header(struct sk_buff *skb);
1452 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1453 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1454 int encap_type);
1455 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1456 extern int xfrm4_rcv(struct sk_buff *skb);
1457
1458 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1459 {
1460 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1461 }
1462
1463 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1464 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1465 extern int xfrm4_output(struct sk_buff *skb);
1466 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1467 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1468 extern int xfrm6_extract_header(struct sk_buff *skb);
1469 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1470 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1471 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1472 extern int xfrm6_rcv(struct sk_buff *skb);
1473 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1474 xfrm_address_t *saddr, u8 proto);
1475 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1476 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1477 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1478 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1479 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1480 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1481 extern int xfrm6_output(struct sk_buff *skb);
1482 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1483 u8 **prevhdr);
1484
1485 #ifdef CONFIG_XFRM
1486 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1487 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1488 #else
1489 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1490 {
1491 return -ENOPROTOOPT;
1492 }
1493
1494 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1495 {
1496 /* should not happen */
1497 kfree_skb(skb);
1498 return 0;
1499 }
1500 #endif
1501
1502 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1503
1504 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1505 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1506 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1507 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1508 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1509 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1510 u8 type, int dir,
1511 struct xfrm_selector *sel,
1512 struct xfrm_sec_ctx *ctx, int delete,
1513 int *err);
1514 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1515 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1516 u32 xfrm_get_acqseq(void);
1517 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1518 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1519 u8 mode, u32 reqid, u8 proto,
1520 const xfrm_address_t *daddr,
1521 const xfrm_address_t *saddr, int create,
1522 unsigned short family);
1523 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1524
1525 #ifdef CONFIG_XFRM_MIGRATE
1526 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1527 const struct xfrm_migrate *m, int num_bundles,
1528 const struct xfrm_kmaddress *k);
1529 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1530 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1531 struct xfrm_migrate *m);
1532 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1533 struct xfrm_migrate *m, int num_bundles,
1534 struct xfrm_kmaddress *k);
1535 #endif
1536
1537 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1538 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1539 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1540
1541 extern void xfrm_input_init(void);
1542 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1543
1544 extern void xfrm_probe_algs(void);
1545 extern int xfrm_count_auth_supported(void);
1546 extern int xfrm_count_enc_supported(void);
1547 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1548 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1549 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1550 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1551 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1552 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1553 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1554 extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1555 extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1556 int probe);
1557
1558 struct hash_desc;
1559 struct scatterlist;
1560 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1561 unsigned int);
1562
1563 static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1564 const xfrm_address_t *b,
1565 int family)
1566 {
1567 switch (family) {
1568 default:
1569 case AF_INET:
1570 return (__force u32)a->a4 - (__force u32)b->a4;
1571 case AF_INET6:
1572 return ipv6_addr_cmp((const struct in6_addr *)a,
1573 (const struct in6_addr *)b);
1574 }
1575 }
1576
1577 static inline int xfrm_policy_id2dir(u32 index)
1578 {
1579 return index & 7;
1580 }
1581
1582 #ifdef CONFIG_XFRM
1583 static inline int xfrm_aevent_is_on(struct net *net)
1584 {
1585 struct sock *nlsk;
1586 int ret = 0;
1587
1588 rcu_read_lock();
1589 nlsk = rcu_dereference(net->xfrm.nlsk);
1590 if (nlsk)
1591 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1592 rcu_read_unlock();
1593 return ret;
1594 }
1595 #endif
1596
1597 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1598 {
1599 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1600 }
1601
1602 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1603 {
1604 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1605 }
1606
1607 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1608 {
1609 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1610 }
1611
1612 #ifdef CONFIG_XFRM_MIGRATE
1613 static inline int xfrm_replay_clone(struct xfrm_state *x,
1614 struct xfrm_state *orig)
1615 {
1616 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1617 GFP_KERNEL);
1618 if (!x->replay_esn)
1619 return -ENOMEM;
1620
1621 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1622 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1623
1624 x->preplay_esn = kmemdup(x->replay_esn,
1625 xfrm_replay_state_esn_len(x->replay_esn),
1626 GFP_KERNEL);
1627 if (!x->preplay_esn) {
1628 kfree(x->replay_esn);
1629 return -ENOMEM;
1630 }
1631
1632 return 0;
1633 }
1634
1635 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1636 {
1637 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1638 }
1639
1640 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1641 {
1642 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1643 }
1644
1645 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1646 {
1647 int i;
1648 for (i = 0; i < n; i++)
1649 xfrm_state_put(*(states + i));
1650 }
1651
1652 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1653 {
1654 int i;
1655 for (i = 0; i < n; i++)
1656 xfrm_state_delete(*(states + i));
1657 }
1658 #endif
1659
1660 #ifdef CONFIG_XFRM
1661 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1662 {
1663 return skb->sp->xvec[skb->sp->len - 1];
1664 }
1665 #endif
1666
1667 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1668 {
1669 if (attrs[XFRMA_MARK])
1670 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1671 else
1672 m->v = m->m = 0;
1673
1674 return m->v & m->m;
1675 }
1676
1677 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1678 {
1679 if (m->m | m->v)
1680 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1681 return 0;
1682
1683 nla_put_failure:
1684 return -1;
1685 }
1686
1687 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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