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xfrm: Const'ify selector args in xfrm_migrate paths.
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / net / xfrm.h
1 #ifndef _NET_XFRM_H
2 #define _NET_XFRM_H
3
4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
15 #include <linux/slab.h>
16
17 #include <net/sock.h>
18 #include <net/dst.h>
19 #include <net/ip.h>
20 #include <net/route.h>
21 #include <net/ipv6.h>
22 #include <net/ip6_fib.h>
23 #include <net/flow.h>
24
25 #include <linux/interrupt.h>
26
27 #ifdef CONFIG_XFRM_STATISTICS
28 #include <net/snmp.h>
29 #endif
30
31 #define XFRM_PROTO_ESP 50
32 #define XFRM_PROTO_AH 51
33 #define XFRM_PROTO_COMP 108
34 #define XFRM_PROTO_IPIP 4
35 #define XFRM_PROTO_IPV6 41
36 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46 #ifdef CONFIG_XFRM_STATISTICS
47 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50 #else
51 #define XFRM_INC_STATS(net, field) ((void)(net))
52 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
53 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
54 #endif
55
56 extern struct mutex xfrm_cfg_mutex;
57
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119 struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 union {
123 u8 dying;
124 u8 proto;
125 };
126 u32 seq;
127 };
128
129 /* Full description of state of transformer. */
130 struct xfrm_state {
131 #ifdef CONFIG_NET_NS
132 struct net *xs_net;
133 #endif
134 union {
135 struct hlist_node gclist;
136 struct hlist_node bydst;
137 };
138 struct hlist_node bysrc;
139 struct hlist_node byspi;
140
141 atomic_t refcnt;
142 spinlock_t lock;
143
144 struct xfrm_id id;
145 struct xfrm_selector sel;
146 struct xfrm_mark mark;
147 u32 tfcpad;
148
149 u32 genid;
150
151 /* Key manager bits */
152 struct xfrm_state_walk km;
153
154 /* Parameters of this state. */
155 struct {
156 u32 reqid;
157 u8 mode;
158 u8 replay_window;
159 u8 aalgo, ealgo, calgo;
160 u8 flags;
161 u16 family;
162 xfrm_address_t saddr;
163 int header_len;
164 int trailer_len;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo_auth *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189
190 /* Replay detection state at the time we sent the last notification */
191 struct xfrm_replay_state preplay;
192
193 /* internal flag that only holds state for delayed aevent at the
194 * moment
195 */
196 u32 xflags;
197
198 /* Replay detection notification settings */
199 u32 replay_maxage;
200 u32 replay_maxdiff;
201
202 /* Replay detection notification timer */
203 struct timer_list rtimer;
204
205 /* Statistics */
206 struct xfrm_stats stats;
207
208 struct xfrm_lifetime_cur curlft;
209 struct tasklet_hrtimer mtimer;
210
211 /* Last used time */
212 unsigned long lastused;
213
214 /* Reference to data common to all the instances of this
215 * transformer. */
216 const struct xfrm_type *type;
217 struct xfrm_mode *inner_mode;
218 struct xfrm_mode *inner_mode_iaf;
219 struct xfrm_mode *outer_mode;
220
221 /* Security context */
222 struct xfrm_sec_ctx *security;
223
224 /* Private data of this transformer, format is opaque,
225 * interpreted by xfrm_type methods. */
226 void *data;
227 };
228
229 static inline struct net *xs_net(struct xfrm_state *x)
230 {
231 return read_pnet(&x->xs_net);
232 }
233
234 /* xflags - make enum if more show up */
235 #define XFRM_TIME_DEFER 1
236
237 enum {
238 XFRM_STATE_VOID,
239 XFRM_STATE_ACQ,
240 XFRM_STATE_VALID,
241 XFRM_STATE_ERROR,
242 XFRM_STATE_EXPIRED,
243 XFRM_STATE_DEAD
244 };
245
246 /* callback structure passed from either netlink or pfkey */
247 struct km_event {
248 union {
249 u32 hard;
250 u32 proto;
251 u32 byid;
252 u32 aevent;
253 u32 type;
254 } data;
255
256 u32 seq;
257 u32 pid;
258 u32 event;
259 struct net *net;
260 };
261
262 struct net_device;
263 struct xfrm_type;
264 struct xfrm_dst;
265 struct xfrm_policy_afinfo {
266 unsigned short family;
267 struct dst_ops *dst_ops;
268 void (*garbage_collect)(struct net *net);
269 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
270 const xfrm_address_t *saddr,
271 const xfrm_address_t *daddr);
272 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
273 void (*decode_session)(struct sk_buff *skb,
274 struct flowi *fl,
275 int reverse);
276 int (*get_tos)(const struct flowi *fl);
277 int (*init_path)(struct xfrm_dst *path,
278 struct dst_entry *dst,
279 int nfheader_len);
280 int (*fill_dst)(struct xfrm_dst *xdst,
281 struct net_device *dev,
282 const struct flowi *fl);
283 };
284
285 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
286 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
287 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
288 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
289
290 struct xfrm_tmpl;
291 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
292 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
293 extern int __xfrm_state_delete(struct xfrm_state *x);
294
295 struct xfrm_state_afinfo {
296 unsigned int family;
297 unsigned int proto;
298 __be16 eth_proto;
299 struct module *owner;
300 const struct xfrm_type *type_map[IPPROTO_MAX];
301 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
302 int (*init_flags)(struct xfrm_state *x);
303 void (*init_tempsel)(struct xfrm_selector *sel,
304 const struct flowi *fl);
305 void (*init_temprop)(struct xfrm_state *x,
306 const struct xfrm_tmpl *tmpl,
307 const xfrm_address_t *daddr,
308 const xfrm_address_t *saddr);
309 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
310 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
311 int (*output)(struct sk_buff *skb);
312 int (*extract_input)(struct xfrm_state *x,
313 struct sk_buff *skb);
314 int (*extract_output)(struct xfrm_state *x,
315 struct sk_buff *skb);
316 int (*transport_finish)(struct sk_buff *skb,
317 int async);
318 };
319
320 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
321 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
322
323 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
324
325 struct xfrm_type {
326 char *description;
327 struct module *owner;
328 u8 proto;
329 u8 flags;
330 #define XFRM_TYPE_NON_FRAGMENT 1
331 #define XFRM_TYPE_REPLAY_PROT 2
332 #define XFRM_TYPE_LOCAL_COADDR 4
333 #define XFRM_TYPE_REMOTE_COADDR 8
334
335 int (*init_state)(struct xfrm_state *x);
336 void (*destructor)(struct xfrm_state *);
337 int (*input)(struct xfrm_state *, struct sk_buff *skb);
338 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
339 int (*reject)(struct xfrm_state *, struct sk_buff *,
340 const struct flowi *);
341 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
342 /* Estimate maximal size of result of transformation of a dgram */
343 u32 (*get_mtu)(struct xfrm_state *, int size);
344 };
345
346 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
347 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
348
349 struct xfrm_mode {
350 /*
351 * Remove encapsulation header.
352 *
353 * The IP header will be moved over the top of the encapsulation
354 * header.
355 *
356 * On entry, the transport header shall point to where the IP header
357 * should be and the network header shall be set to where the IP
358 * header currently is. skb->data shall point to the start of the
359 * payload.
360 */
361 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
362
363 /*
364 * This is the actual input entry point.
365 *
366 * For transport mode and equivalent this would be identical to
367 * input2 (which does not need to be set). While tunnel mode
368 * and equivalent would set this to the tunnel encapsulation function
369 * xfrm4_prepare_input that would in turn call input2.
370 */
371 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
372
373 /*
374 * Add encapsulation header.
375 *
376 * On exit, the transport header will be set to the start of the
377 * encapsulation header to be filled in by x->type->output and
378 * the mac header will be set to the nextheader (protocol for
379 * IPv4) field of the extension header directly preceding the
380 * encapsulation header, or in its absence, that of the top IP
381 * header. The value of the network header will always point
382 * to the top IP header while skb->data will point to the payload.
383 */
384 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
385
386 /*
387 * This is the actual output entry point.
388 *
389 * For transport mode and equivalent this would be identical to
390 * output2 (which does not need to be set). While tunnel mode
391 * and equivalent would set this to a tunnel encapsulation function
392 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
393 * call output2.
394 */
395 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
396
397 struct xfrm_state_afinfo *afinfo;
398 struct module *owner;
399 unsigned int encap;
400 int flags;
401 };
402
403 /* Flags for xfrm_mode. */
404 enum {
405 XFRM_MODE_FLAG_TUNNEL = 1,
406 };
407
408 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
409 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
410
411 static inline int xfrm_af2proto(unsigned int family)
412 {
413 switch(family) {
414 case AF_INET:
415 return IPPROTO_IPIP;
416 case AF_INET6:
417 return IPPROTO_IPV6;
418 default:
419 return 0;
420 }
421 }
422
423 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
424 {
425 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
426 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
427 return x->inner_mode;
428 else
429 return x->inner_mode_iaf;
430 }
431
432 struct xfrm_tmpl {
433 /* id in template is interpreted as:
434 * daddr - destination of tunnel, may be zero for transport mode.
435 * spi - zero to acquire spi. Not zero if spi is static, then
436 * daddr must be fixed too.
437 * proto - AH/ESP/IPCOMP
438 */
439 struct xfrm_id id;
440
441 /* Source address of tunnel. Ignored, if it is not a tunnel. */
442 xfrm_address_t saddr;
443
444 unsigned short encap_family;
445
446 u32 reqid;
447
448 /* Mode: transport, tunnel etc. */
449 u8 mode;
450
451 /* Sharing mode: unique, this session only, this user only etc. */
452 u8 share;
453
454 /* May skip this transfomration if no SA is found */
455 u8 optional;
456
457 /* Skip aalgos/ealgos/calgos checks. */
458 u8 allalgs;
459
460 /* Bit mask of algos allowed for acquisition */
461 u32 aalgos;
462 u32 ealgos;
463 u32 calgos;
464 };
465
466 #define XFRM_MAX_DEPTH 6
467
468 struct xfrm_policy_walk_entry {
469 struct list_head all;
470 u8 dead;
471 };
472
473 struct xfrm_policy_walk {
474 struct xfrm_policy_walk_entry walk;
475 u8 type;
476 u32 seq;
477 };
478
479 struct xfrm_policy {
480 #ifdef CONFIG_NET_NS
481 struct net *xp_net;
482 #endif
483 struct hlist_node bydst;
484 struct hlist_node byidx;
485
486 /* This lock only affects elements except for entry. */
487 rwlock_t lock;
488 atomic_t refcnt;
489 struct timer_list timer;
490
491 struct flow_cache_object flo;
492 atomic_t genid;
493 u32 priority;
494 u32 index;
495 struct xfrm_mark mark;
496 struct xfrm_selector selector;
497 struct xfrm_lifetime_cfg lft;
498 struct xfrm_lifetime_cur curlft;
499 struct xfrm_policy_walk_entry walk;
500 u8 type;
501 u8 action;
502 u8 flags;
503 u8 xfrm_nr;
504 u16 family;
505 struct xfrm_sec_ctx *security;
506 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
507 };
508
509 static inline struct net *xp_net(struct xfrm_policy *xp)
510 {
511 return read_pnet(&xp->xp_net);
512 }
513
514 struct xfrm_kmaddress {
515 xfrm_address_t local;
516 xfrm_address_t remote;
517 u32 reserved;
518 u16 family;
519 };
520
521 struct xfrm_migrate {
522 xfrm_address_t old_daddr;
523 xfrm_address_t old_saddr;
524 xfrm_address_t new_daddr;
525 xfrm_address_t new_saddr;
526 u8 proto;
527 u8 mode;
528 u16 reserved;
529 u32 reqid;
530 u16 old_family;
531 u16 new_family;
532 };
533
534 #define XFRM_KM_TIMEOUT 30
535 /* which seqno */
536 #define XFRM_REPLAY_SEQ 1
537 #define XFRM_REPLAY_OSEQ 2
538 #define XFRM_REPLAY_SEQ_MASK 3
539 /* what happened */
540 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
541 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
542
543 /* default aevent timeout in units of 100ms */
544 #define XFRM_AE_ETIME 10
545 /* Async Event timer multiplier */
546 #define XFRM_AE_ETH_M 10
547 /* default seq threshold size */
548 #define XFRM_AE_SEQT_SIZE 2
549
550 struct xfrm_mgr {
551 struct list_head list;
552 char *id;
553 int (*notify)(struct xfrm_state *x, const struct km_event *c);
554 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
555 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
556 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
557 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
558 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
559 int (*migrate)(const struct xfrm_selector *sel,
560 u8 dir, u8 type,
561 const struct xfrm_migrate *m,
562 int num_bundles,
563 const struct xfrm_kmaddress *k);
564 };
565
566 extern int xfrm_register_km(struct xfrm_mgr *km);
567 extern int xfrm_unregister_km(struct xfrm_mgr *km);
568
569 /*
570 * This structure is used for the duration where packets are being
571 * transformed by IPsec. As soon as the packet leaves IPsec the
572 * area beyond the generic IP part may be overwritten.
573 */
574 struct xfrm_skb_cb {
575 union {
576 struct inet_skb_parm h4;
577 struct inet6_skb_parm h6;
578 } header;
579
580 /* Sequence number for replay protection. */
581 union {
582 u64 output;
583 __be32 input;
584 } seq;
585 };
586
587 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
588
589 /*
590 * This structure is used by the afinfo prepare_input/prepare_output functions
591 * to transmit header information to the mode input/output functions.
592 */
593 struct xfrm_mode_skb_cb {
594 union {
595 struct inet_skb_parm h4;
596 struct inet6_skb_parm h6;
597 } header;
598
599 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
600 __be16 id;
601 __be16 frag_off;
602
603 /* IP header length (excluding options or extension headers). */
604 u8 ihl;
605
606 /* TOS for IPv4, class for IPv6. */
607 u8 tos;
608
609 /* TTL for IPv4, hop limitfor IPv6. */
610 u8 ttl;
611
612 /* Protocol for IPv4, NH for IPv6. */
613 u8 protocol;
614
615 /* Option length for IPv4, zero for IPv6. */
616 u8 optlen;
617
618 /* Used by IPv6 only, zero for IPv4. */
619 u8 flow_lbl[3];
620 };
621
622 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
623
624 /*
625 * This structure is used by the input processing to locate the SPI and
626 * related information.
627 */
628 struct xfrm_spi_skb_cb {
629 union {
630 struct inet_skb_parm h4;
631 struct inet6_skb_parm h6;
632 } header;
633
634 unsigned int daddroff;
635 unsigned int family;
636 };
637
638 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
639
640 /* Audit Information */
641 struct xfrm_audit {
642 u32 secid;
643 uid_t loginuid;
644 u32 sessionid;
645 };
646
647 #ifdef CONFIG_AUDITSYSCALL
648 static inline struct audit_buffer *xfrm_audit_start(const char *op)
649 {
650 struct audit_buffer *audit_buf = NULL;
651
652 if (audit_enabled == 0)
653 return NULL;
654 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
655 AUDIT_MAC_IPSEC_EVENT);
656 if (audit_buf == NULL)
657 return NULL;
658 audit_log_format(audit_buf, "op=%s", op);
659 return audit_buf;
660 }
661
662 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
663 struct audit_buffer *audit_buf)
664 {
665 char *secctx;
666 u32 secctx_len;
667
668 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
669 if (secid != 0 &&
670 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
671 audit_log_format(audit_buf, " subj=%s", secctx);
672 security_release_secctx(secctx, secctx_len);
673 } else
674 audit_log_task_context(audit_buf);
675 }
676
677 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
678 u32 auid, u32 ses, u32 secid);
679 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
680 u32 auid, u32 ses, u32 secid);
681 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
682 u32 auid, u32 ses, u32 secid);
683 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
684 u32 auid, u32 ses, u32 secid);
685 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
686 struct sk_buff *skb);
687 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
688 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
689 __be32 net_spi, __be32 net_seq);
690 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
691 struct sk_buff *skb, u8 proto);
692 #else
693
694 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
695 u32 auid, u32 ses, u32 secid)
696 {
697 }
698
699 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
700 u32 auid, u32 ses, u32 secid)
701 {
702 }
703
704 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
705 u32 auid, u32 ses, u32 secid)
706 {
707 }
708
709 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
710 u32 auid, u32 ses, u32 secid)
711 {
712 }
713
714 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
715 struct sk_buff *skb)
716 {
717 }
718
719 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
720 u16 family)
721 {
722 }
723
724 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
725 __be32 net_spi, __be32 net_seq)
726 {
727 }
728
729 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
730 struct sk_buff *skb, u8 proto)
731 {
732 }
733 #endif /* CONFIG_AUDITSYSCALL */
734
735 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
736 {
737 if (likely(policy != NULL))
738 atomic_inc(&policy->refcnt);
739 }
740
741 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
742
743 static inline void xfrm_pol_put(struct xfrm_policy *policy)
744 {
745 if (atomic_dec_and_test(&policy->refcnt))
746 xfrm_policy_destroy(policy);
747 }
748
749 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
750 {
751 int i;
752 for (i = npols - 1; i >= 0; --i)
753 xfrm_pol_put(pols[i]);
754 }
755
756 extern void __xfrm_state_destroy(struct xfrm_state *);
757
758 static inline void __xfrm_state_put(struct xfrm_state *x)
759 {
760 atomic_dec(&x->refcnt);
761 }
762
763 static inline void xfrm_state_put(struct xfrm_state *x)
764 {
765 if (atomic_dec_and_test(&x->refcnt))
766 __xfrm_state_destroy(x);
767 }
768
769 static inline void xfrm_state_hold(struct xfrm_state *x)
770 {
771 atomic_inc(&x->refcnt);
772 }
773
774 static inline bool addr_match(const void *token1, const void *token2,
775 int prefixlen)
776 {
777 const __be32 *a1 = token1;
778 const __be32 *a2 = token2;
779 int pdw;
780 int pbi;
781
782 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
783 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
784
785 if (pdw)
786 if (memcmp(a1, a2, pdw << 2))
787 return false;
788
789 if (pbi) {
790 __be32 mask;
791
792 mask = htonl((0xffffffff) << (32 - pbi));
793
794 if ((a1[pdw] ^ a2[pdw]) & mask)
795 return false;
796 }
797
798 return true;
799 }
800
801 static __inline__
802 __be16 xfrm_flowi_sport(const struct flowi *fl)
803 {
804 __be16 port;
805 switch(fl->proto) {
806 case IPPROTO_TCP:
807 case IPPROTO_UDP:
808 case IPPROTO_UDPLITE:
809 case IPPROTO_SCTP:
810 port = fl->fl_ip_sport;
811 break;
812 case IPPROTO_ICMP:
813 case IPPROTO_ICMPV6:
814 port = htons(fl->fl_icmp_type);
815 break;
816 case IPPROTO_MH:
817 port = htons(fl->fl_mh_type);
818 break;
819 case IPPROTO_GRE:
820 port = htons(ntohl(fl->fl_gre_key) >> 16);
821 break;
822 default:
823 port = 0; /*XXX*/
824 }
825 return port;
826 }
827
828 static __inline__
829 __be16 xfrm_flowi_dport(const struct flowi *fl)
830 {
831 __be16 port;
832 switch(fl->proto) {
833 case IPPROTO_TCP:
834 case IPPROTO_UDP:
835 case IPPROTO_UDPLITE:
836 case IPPROTO_SCTP:
837 port = fl->fl_ip_dport;
838 break;
839 case IPPROTO_ICMP:
840 case IPPROTO_ICMPV6:
841 port = htons(fl->fl_icmp_code);
842 break;
843 case IPPROTO_GRE:
844 port = htons(ntohl(fl->fl_gre_key) & 0xffff);
845 break;
846 default:
847 port = 0; /*XXX*/
848 }
849 return port;
850 }
851
852 extern int xfrm_selector_match(const struct xfrm_selector *sel,
853 const struct flowi *fl,
854 unsigned short family);
855
856 #ifdef CONFIG_SECURITY_NETWORK_XFRM
857 /* If neither has a context --> match
858 * Otherwise, both must have a context and the sids, doi, alg must match
859 */
860 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
861 {
862 return ((!s1 && !s2) ||
863 (s1 && s2 &&
864 (s1->ctx_sid == s2->ctx_sid) &&
865 (s1->ctx_doi == s2->ctx_doi) &&
866 (s1->ctx_alg == s2->ctx_alg)));
867 }
868 #else
869 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
870 {
871 return 1;
872 }
873 #endif
874
875 /* A struct encoding bundle of transformations to apply to some set of flow.
876 *
877 * dst->child points to the next element of bundle.
878 * dst->xfrm points to an instanse of transformer.
879 *
880 * Due to unfortunate limitations of current routing cache, which we
881 * have no time to fix, it mirrors struct rtable and bound to the same
882 * routing key, including saddr,daddr. However, we can have many of
883 * bundles differing by session id. All the bundles grow from a parent
884 * policy rule.
885 */
886 struct xfrm_dst {
887 union {
888 struct dst_entry dst;
889 struct rtable rt;
890 struct rt6_info rt6;
891 } u;
892 struct dst_entry *route;
893 struct flow_cache_object flo;
894 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
895 int num_pols, num_xfrms;
896 #ifdef CONFIG_XFRM_SUB_POLICY
897 struct flowi *origin;
898 struct xfrm_selector *partner;
899 #endif
900 u32 xfrm_genid;
901 u32 policy_genid;
902 u32 route_mtu_cached;
903 u32 child_mtu_cached;
904 u32 route_cookie;
905 u32 path_cookie;
906 };
907
908 #ifdef CONFIG_XFRM
909 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
910 {
911 xfrm_pols_put(xdst->pols, xdst->num_pols);
912 dst_release(xdst->route);
913 if (likely(xdst->u.dst.xfrm))
914 xfrm_state_put(xdst->u.dst.xfrm);
915 #ifdef CONFIG_XFRM_SUB_POLICY
916 kfree(xdst->origin);
917 xdst->origin = NULL;
918 kfree(xdst->partner);
919 xdst->partner = NULL;
920 #endif
921 }
922 #endif
923
924 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
925
926 struct sec_path {
927 atomic_t refcnt;
928 int len;
929 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
930 };
931
932 static inline struct sec_path *
933 secpath_get(struct sec_path *sp)
934 {
935 if (sp)
936 atomic_inc(&sp->refcnt);
937 return sp;
938 }
939
940 extern void __secpath_destroy(struct sec_path *sp);
941
942 static inline void
943 secpath_put(struct sec_path *sp)
944 {
945 if (sp && atomic_dec_and_test(&sp->refcnt))
946 __secpath_destroy(sp);
947 }
948
949 extern struct sec_path *secpath_dup(struct sec_path *src);
950
951 static inline void
952 secpath_reset(struct sk_buff *skb)
953 {
954 #ifdef CONFIG_XFRM
955 secpath_put(skb->sp);
956 skb->sp = NULL;
957 #endif
958 }
959
960 static inline int
961 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
962 {
963 switch (family) {
964 case AF_INET:
965 return addr->a4 == 0;
966 case AF_INET6:
967 return ipv6_addr_any((struct in6_addr *)&addr->a6);
968 }
969 return 0;
970 }
971
972 static inline int
973 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
974 {
975 return (tmpl->saddr.a4 &&
976 tmpl->saddr.a4 != x->props.saddr.a4);
977 }
978
979 static inline int
980 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
981 {
982 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
983 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
984 }
985
986 static inline int
987 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
988 {
989 switch (family) {
990 case AF_INET:
991 return __xfrm4_state_addr_cmp(tmpl, x);
992 case AF_INET6:
993 return __xfrm6_state_addr_cmp(tmpl, x);
994 }
995 return !0;
996 }
997
998 #ifdef CONFIG_XFRM
999 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1000
1001 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1002 struct sk_buff *skb,
1003 unsigned int family, int reverse)
1004 {
1005 struct net *net = dev_net(skb->dev);
1006 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1007
1008 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1009 return __xfrm_policy_check(sk, ndir, skb, family);
1010
1011 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1012 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1013 __xfrm_policy_check(sk, ndir, skb, family);
1014 }
1015
1016 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1017 {
1018 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1019 }
1020
1021 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1022 {
1023 return xfrm_policy_check(sk, dir, skb, AF_INET);
1024 }
1025
1026 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1027 {
1028 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1029 }
1030
1031 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1032 struct sk_buff *skb)
1033 {
1034 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1035 }
1036
1037 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1038 struct sk_buff *skb)
1039 {
1040 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1041 }
1042
1043 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1044 unsigned int family, int reverse);
1045
1046 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1047 unsigned int family)
1048 {
1049 return __xfrm_decode_session(skb, fl, family, 0);
1050 }
1051
1052 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1053 struct flowi *fl,
1054 unsigned int family)
1055 {
1056 return __xfrm_decode_session(skb, fl, family, 1);
1057 }
1058
1059 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1060
1061 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1062 {
1063 struct net *net = dev_net(skb->dev);
1064
1065 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1066 (skb_dst(skb)->flags & DST_NOXFRM) ||
1067 __xfrm_route_forward(skb, family);
1068 }
1069
1070 static inline int xfrm4_route_forward(struct sk_buff *skb)
1071 {
1072 return xfrm_route_forward(skb, AF_INET);
1073 }
1074
1075 static inline int xfrm6_route_forward(struct sk_buff *skb)
1076 {
1077 return xfrm_route_forward(skb, AF_INET6);
1078 }
1079
1080 extern int __xfrm_sk_clone_policy(struct sock *sk);
1081
1082 static inline int xfrm_sk_clone_policy(struct sock *sk)
1083 {
1084 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1085 return __xfrm_sk_clone_policy(sk);
1086 return 0;
1087 }
1088
1089 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1090
1091 static inline void xfrm_sk_free_policy(struct sock *sk)
1092 {
1093 if (unlikely(sk->sk_policy[0] != NULL)) {
1094 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1095 sk->sk_policy[0] = NULL;
1096 }
1097 if (unlikely(sk->sk_policy[1] != NULL)) {
1098 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1099 sk->sk_policy[1] = NULL;
1100 }
1101 }
1102
1103 #else
1104
1105 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1106 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1107 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1108 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1109 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1110 {
1111 return 1;
1112 }
1113 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1114 {
1115 return 1;
1116 }
1117 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1118 {
1119 return 1;
1120 }
1121 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1122 struct flowi *fl,
1123 unsigned int family)
1124 {
1125 return -ENOSYS;
1126 }
1127 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1128 struct sk_buff *skb)
1129 {
1130 return 1;
1131 }
1132 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1133 struct sk_buff *skb)
1134 {
1135 return 1;
1136 }
1137 #endif
1138
1139 static __inline__
1140 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1141 {
1142 switch (family){
1143 case AF_INET:
1144 return (xfrm_address_t *)&fl->fl4_dst;
1145 case AF_INET6:
1146 return (xfrm_address_t *)&fl->fl6_dst;
1147 }
1148 return NULL;
1149 }
1150
1151 static __inline__
1152 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1153 {
1154 switch (family){
1155 case AF_INET:
1156 return (xfrm_address_t *)&fl->fl4_src;
1157 case AF_INET6:
1158 return (xfrm_address_t *)&fl->fl6_src;
1159 }
1160 return NULL;
1161 }
1162
1163 static __inline__
1164 void xfrm_flowi_addr_get(const struct flowi *fl,
1165 xfrm_address_t *saddr, xfrm_address_t *daddr,
1166 unsigned short family)
1167 {
1168 switch(family) {
1169 case AF_INET:
1170 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1171 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1172 break;
1173 case AF_INET6:
1174 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1175 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1176 break;
1177 }
1178 }
1179
1180 static __inline__ int
1181 __xfrm4_state_addr_check(struct xfrm_state *x,
1182 xfrm_address_t *daddr, xfrm_address_t *saddr)
1183 {
1184 if (daddr->a4 == x->id.daddr.a4 &&
1185 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1186 return 1;
1187 return 0;
1188 }
1189
1190 static __inline__ int
1191 __xfrm6_state_addr_check(struct xfrm_state *x,
1192 xfrm_address_t *daddr, xfrm_address_t *saddr)
1193 {
1194 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1195 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1196 ipv6_addr_any((struct in6_addr *)saddr) ||
1197 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1198 return 1;
1199 return 0;
1200 }
1201
1202 static __inline__ int
1203 xfrm_state_addr_check(struct xfrm_state *x,
1204 xfrm_address_t *daddr, xfrm_address_t *saddr,
1205 unsigned short family)
1206 {
1207 switch (family) {
1208 case AF_INET:
1209 return __xfrm4_state_addr_check(x, daddr, saddr);
1210 case AF_INET6:
1211 return __xfrm6_state_addr_check(x, daddr, saddr);
1212 }
1213 return 0;
1214 }
1215
1216 static __inline__ int
1217 xfrm_state_addr_flow_check(struct xfrm_state *x, const struct flowi *fl,
1218 unsigned short family)
1219 {
1220 switch (family) {
1221 case AF_INET:
1222 return __xfrm4_state_addr_check(x,
1223 (xfrm_address_t *)&fl->fl4_dst,
1224 (xfrm_address_t *)&fl->fl4_src);
1225 case AF_INET6:
1226 return __xfrm6_state_addr_check(x,
1227 (xfrm_address_t *)&fl->fl6_dst,
1228 (xfrm_address_t *)&fl->fl6_src);
1229 }
1230 return 0;
1231 }
1232
1233 static inline int xfrm_state_kern(struct xfrm_state *x)
1234 {
1235 return atomic_read(&x->tunnel_users);
1236 }
1237
1238 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1239 {
1240 return (!userproto || proto == userproto ||
1241 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1242 proto == IPPROTO_ESP ||
1243 proto == IPPROTO_COMP)));
1244 }
1245
1246 /*
1247 * xfrm algorithm information
1248 */
1249 struct xfrm_algo_aead_info {
1250 u16 icv_truncbits;
1251 };
1252
1253 struct xfrm_algo_auth_info {
1254 u16 icv_truncbits;
1255 u16 icv_fullbits;
1256 };
1257
1258 struct xfrm_algo_encr_info {
1259 u16 blockbits;
1260 u16 defkeybits;
1261 };
1262
1263 struct xfrm_algo_comp_info {
1264 u16 threshold;
1265 };
1266
1267 struct xfrm_algo_desc {
1268 char *name;
1269 char *compat;
1270 u8 available:1;
1271 union {
1272 struct xfrm_algo_aead_info aead;
1273 struct xfrm_algo_auth_info auth;
1274 struct xfrm_algo_encr_info encr;
1275 struct xfrm_algo_comp_info comp;
1276 } uinfo;
1277 struct sadb_alg desc;
1278 };
1279
1280 /* XFRM tunnel handlers. */
1281 struct xfrm_tunnel {
1282 int (*handler)(struct sk_buff *skb);
1283 int (*err_handler)(struct sk_buff *skb, u32 info);
1284
1285 struct xfrm_tunnel __rcu *next;
1286 int priority;
1287 };
1288
1289 struct xfrm6_tunnel {
1290 int (*handler)(struct sk_buff *skb);
1291 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1292 u8 type, u8 code, int offset, __be32 info);
1293 struct xfrm6_tunnel __rcu *next;
1294 int priority;
1295 };
1296
1297 extern void xfrm_init(void);
1298 extern void xfrm4_init(int rt_hash_size);
1299 extern int xfrm_state_init(struct net *net);
1300 extern void xfrm_state_fini(struct net *net);
1301 extern void xfrm4_state_init(void);
1302 #ifdef CONFIG_XFRM
1303 extern int xfrm6_init(void);
1304 extern void xfrm6_fini(void);
1305 extern int xfrm6_state_init(void);
1306 extern void xfrm6_state_fini(void);
1307 #else
1308 static inline int xfrm6_init(void)
1309 {
1310 return 0;
1311 }
1312 static inline void xfrm6_fini(void)
1313 {
1314 ;
1315 }
1316 #endif
1317
1318 #ifdef CONFIG_XFRM_STATISTICS
1319 extern int xfrm_proc_init(struct net *net);
1320 extern void xfrm_proc_fini(struct net *net);
1321 #endif
1322
1323 extern int xfrm_sysctl_init(struct net *net);
1324 #ifdef CONFIG_SYSCTL
1325 extern void xfrm_sysctl_fini(struct net *net);
1326 #else
1327 static inline void xfrm_sysctl_fini(struct net *net)
1328 {
1329 }
1330 #endif
1331
1332 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1333 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1334 int (*func)(struct xfrm_state *, int, void*), void *);
1335 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1336 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1337 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr,
1338 xfrm_address_t *saddr,
1339 const struct flowi *fl,
1340 struct xfrm_tmpl *tmpl,
1341 struct xfrm_policy *pol, int *err,
1342 unsigned short family);
1343 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1344 xfrm_address_t *daddr,
1345 xfrm_address_t *saddr,
1346 unsigned short family,
1347 u8 mode, u8 proto, u32 reqid);
1348 extern int xfrm_state_check_expire(struct xfrm_state *x);
1349 extern void xfrm_state_insert(struct xfrm_state *x);
1350 extern int xfrm_state_add(struct xfrm_state *x);
1351 extern int xfrm_state_update(struct xfrm_state *x);
1352 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1353 xfrm_address_t *daddr, __be32 spi,
1354 u8 proto, unsigned short family);
1355 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1356 xfrm_address_t *daddr,
1357 xfrm_address_t *saddr,
1358 u8 proto,
1359 unsigned short family);
1360 #ifdef CONFIG_XFRM_SUB_POLICY
1361 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1362 int n, unsigned short family);
1363 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1364 int n, unsigned short family);
1365 #else
1366 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1367 int n, unsigned short family)
1368 {
1369 return -ENOSYS;
1370 }
1371
1372 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1373 int n, unsigned short family)
1374 {
1375 return -ENOSYS;
1376 }
1377 #endif
1378
1379 struct xfrmk_sadinfo {
1380 u32 sadhcnt; /* current hash bkts */
1381 u32 sadhmcnt; /* max allowed hash bkts */
1382 u32 sadcnt; /* current running count */
1383 };
1384
1385 struct xfrmk_spdinfo {
1386 u32 incnt;
1387 u32 outcnt;
1388 u32 fwdcnt;
1389 u32 inscnt;
1390 u32 outscnt;
1391 u32 fwdscnt;
1392 u32 spdhcnt;
1393 u32 spdhmcnt;
1394 };
1395
1396 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1397 u32 seq);
1398 extern int xfrm_state_delete(struct xfrm_state *x);
1399 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1400 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1401 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1402 extern int xfrm_replay_check(struct xfrm_state *x,
1403 struct sk_buff *skb, __be32 seq);
1404 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1405 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1406 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1407 extern int xfrm_init_state(struct xfrm_state *x);
1408 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1409 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1410 int encap_type);
1411 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1412 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1413 extern int xfrm_output(struct sk_buff *skb);
1414 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1415 extern int xfrm4_extract_header(struct sk_buff *skb);
1416 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1417 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1418 int encap_type);
1419 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1420 extern int xfrm4_rcv(struct sk_buff *skb);
1421
1422 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1423 {
1424 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1425 }
1426
1427 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1428 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1429 extern int xfrm4_output(struct sk_buff *skb);
1430 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1431 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1432 extern int xfrm6_extract_header(struct sk_buff *skb);
1433 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1434 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1435 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1436 extern int xfrm6_rcv(struct sk_buff *skb);
1437 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1438 xfrm_address_t *saddr, u8 proto);
1439 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1440 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1441 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1442 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
1443 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1444 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1445 extern int xfrm6_output(struct sk_buff *skb);
1446 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1447 u8 **prevhdr);
1448
1449 #ifdef CONFIG_XFRM
1450 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1451 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1452 #else
1453 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1454 {
1455 return -ENOPROTOOPT;
1456 }
1457
1458 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1459 {
1460 /* should not happen */
1461 kfree_skb(skb);
1462 return 0;
1463 }
1464 #endif
1465
1466 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1467
1468 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1469 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1470 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1471 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1472 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1473 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1474 u8 type, int dir,
1475 struct xfrm_selector *sel,
1476 struct xfrm_sec_ctx *ctx, int delete,
1477 int *err);
1478 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1479 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1480 u32 xfrm_get_acqseq(void);
1481 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1482 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1483 u8 mode, u32 reqid, u8 proto,
1484 xfrm_address_t *daddr,
1485 xfrm_address_t *saddr, int create,
1486 unsigned short family);
1487 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1488
1489 #ifdef CONFIG_XFRM_MIGRATE
1490 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1491 const struct xfrm_migrate *m, int num_bundles,
1492 const struct xfrm_kmaddress *k);
1493 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1494 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1495 struct xfrm_migrate *m);
1496 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1497 struct xfrm_migrate *m, int num_bundles,
1498 struct xfrm_kmaddress *k);
1499 #endif
1500
1501 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1502 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1503 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1504
1505 extern void xfrm_input_init(void);
1506 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1507
1508 extern void xfrm_probe_algs(void);
1509 extern int xfrm_count_auth_supported(void);
1510 extern int xfrm_count_enc_supported(void);
1511 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1512 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1513 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1514 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1515 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1516 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1517 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1518 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1519 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1520 int probe);
1521
1522 struct hash_desc;
1523 struct scatterlist;
1524 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1525 unsigned int);
1526
1527 static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1528 const xfrm_address_t *b,
1529 int family)
1530 {
1531 switch (family) {
1532 default:
1533 case AF_INET:
1534 return (__force u32)a->a4 - (__force u32)b->a4;
1535 case AF_INET6:
1536 return ipv6_addr_cmp((struct in6_addr *)a,
1537 (struct in6_addr *)b);
1538 }
1539 }
1540
1541 static inline int xfrm_policy_id2dir(u32 index)
1542 {
1543 return index & 7;
1544 }
1545
1546 #ifdef CONFIG_XFRM
1547 static inline int xfrm_aevent_is_on(struct net *net)
1548 {
1549 struct sock *nlsk;
1550 int ret = 0;
1551
1552 rcu_read_lock();
1553 nlsk = rcu_dereference(net->xfrm.nlsk);
1554 if (nlsk)
1555 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1556 rcu_read_unlock();
1557 return ret;
1558 }
1559 #endif
1560
1561 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1562 {
1563 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1564 }
1565
1566 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1567 {
1568 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1569 }
1570
1571 #ifdef CONFIG_XFRM_MIGRATE
1572 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1573 {
1574 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1575 }
1576
1577 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1578 {
1579 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1580 }
1581
1582 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1583 {
1584 int i;
1585 for (i = 0; i < n; i++)
1586 xfrm_state_put(*(states + i));
1587 }
1588
1589 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1590 {
1591 int i;
1592 for (i = 0; i < n; i++)
1593 xfrm_state_delete(*(states + i));
1594 }
1595 #endif
1596
1597 #ifdef CONFIG_XFRM
1598 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1599 {
1600 return skb->sp->xvec[skb->sp->len - 1];
1601 }
1602 #endif
1603
1604 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1605 {
1606 if (attrs[XFRMA_MARK])
1607 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1608 else
1609 m->v = m->m = 0;
1610
1611 return m->v & m->m;
1612 }
1613
1614 static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m)
1615 {
1616 if (m->m | m->v)
1617 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1618 return 0;
1619
1620 nla_put_failure:
1621 return -1;
1622 }
1623
1624 #endif /* _NET_XFRM_H */
kernel source for telekom puls (alcatel/mediatek)