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netfilter: nf_conntrack: add support for "conntrack zones"
[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
16 #include <net/sock.h>
17 #include <net/dst.h>
18 #include <net/ip.h>
19 #include <net/route.h>
20 #include <net/ipv6.h>
21 #include <net/ip6_fib.h>
22
23 #include <linux/interrupt.h>
24
25 #ifdef CONFIG_XFRM_STATISTICS
26 #include <net/snmp.h>
27 #endif
28
29 #define XFRM_PROTO_ESP 50
30 #define XFRM_PROTO_AH 51
31 #define XFRM_PROTO_COMP 108
32 #define XFRM_PROTO_IPIP 4
33 #define XFRM_PROTO_IPV6 41
34 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
35 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
36
37 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
38 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
39 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
40 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
41 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
42
43 #ifdef CONFIG_XFRM_STATISTICS
44 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
45 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
46 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
47 #else
48 #define XFRM_INC_STATS(net, field) ((void)(net))
49 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
50 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
51 #endif
52
53 extern struct mutex xfrm_cfg_mutex;
54
55 /* Organization of SPD aka "XFRM rules"
56 ------------------------------------
57
58 Basic objects:
59 - policy rule, struct xfrm_policy (=SPD entry)
60 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
61 - instance of a transformer, struct xfrm_state (=SA)
62 - template to clone xfrm_state, struct xfrm_tmpl
63
64 SPD is plain linear list of xfrm_policy rules, ordered by priority.
65 (To be compatible with existing pfkeyv2 implementations,
66 many rules with priority of 0x7fffffff are allowed to exist and
67 such rules are ordered in an unpredictable way, thanks to bsd folks.)
68
69 Lookup is plain linear search until the first match with selector.
70
71 If "action" is "block", then we prohibit the flow, otherwise:
72 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
73 policy entry has list of up to XFRM_MAX_DEPTH transformations,
74 described by templates xfrm_tmpl. Each template is resolved
75 to a complete xfrm_state (see below) and we pack bundle of transformations
76 to a dst_entry returned to requestor.
77
78 dst -. xfrm .-> xfrm_state #1
79 |---. child .-> dst -. xfrm .-> xfrm_state #2
80 |---. child .-> dst -. xfrm .-> xfrm_state #3
81 |---. child .-> NULL
82
83 Bundles are cached at xrfm_policy struct (field ->bundles).
84
85
86 Resolution of xrfm_tmpl
87 -----------------------
88 Template contains:
89 1. ->mode Mode: transport or tunnel
90 2. ->id.proto Protocol: AH/ESP/IPCOMP
91 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
92 Q: allow to resolve security gateway?
93 4. ->id.spi If not zero, static SPI.
94 5. ->saddr Local tunnel endpoint, ignored for transport mode.
95 6. ->algos List of allowed algos. Plain bitmask now.
96 Q: ealgos, aalgos, calgos. What a mess...
97 7. ->share Sharing mode.
98 Q: how to implement private sharing mode? To add struct sock* to
99 flow id?
100
101 Having this template we search through SAD searching for entries
102 with appropriate mode/proto/algo, permitted by selector.
103 If no appropriate entry found, it is requested from key manager.
104
105 PROBLEMS:
106 Q: How to find all the bundles referring to a physical path for
107 PMTU discovery? Seems, dst should contain list of all parents...
108 and enter to infinite locking hierarchy disaster.
109 No! It is easier, we will not search for them, let them find us.
110 We add genid to each dst plus pointer to genid of raw IP route,
111 pmtu disc will update pmtu on raw IP route and increase its genid.
112 dst_check() will see this for top level and trigger resyncing
113 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
114 */
115
116 struct xfrm_state_walk {
117 struct list_head all;
118 u8 state;
119 union {
120 u8 dying;
121 u8 proto;
122 };
123 u32 seq;
124 };
125
126 /* Full description of state of transformer. */
127 struct xfrm_state {
128 #ifdef CONFIG_NET_NS
129 struct net *xs_net;
130 #endif
131 union {
132 struct hlist_node gclist;
133 struct hlist_node bydst;
134 };
135 struct hlist_node bysrc;
136 struct hlist_node byspi;
137
138 atomic_t refcnt;
139 spinlock_t lock;
140
141 struct xfrm_id id;
142 struct xfrm_selector sel;
143
144 u32 genid;
145
146 /* Key manager bits */
147 struct xfrm_state_walk km;
148
149 /* Parameters of this state. */
150 struct {
151 u32 reqid;
152 u8 mode;
153 u8 replay_window;
154 u8 aalgo, ealgo, calgo;
155 u8 flags;
156 u16 family;
157 xfrm_address_t saddr;
158 int header_len;
159 int trailer_len;
160 } props;
161
162 struct xfrm_lifetime_cfg lft;
163
164 /* Data for transformer */
165 struct xfrm_algo_auth *aalg;
166 struct xfrm_algo *ealg;
167 struct xfrm_algo *calg;
168 struct xfrm_algo_aead *aead;
169
170 /* Data for encapsulator */
171 struct xfrm_encap_tmpl *encap;
172
173 /* Data for care-of address */
174 xfrm_address_t *coaddr;
175
176 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
177 struct xfrm_state *tunnel;
178
179 /* If a tunnel, number of users + 1 */
180 atomic_t tunnel_users;
181
182 /* State for replay detection */
183 struct xfrm_replay_state replay;
184
185 /* Replay detection state at the time we sent the last notification */
186 struct xfrm_replay_state preplay;
187
188 /* internal flag that only holds state for delayed aevent at the
189 * moment
190 */
191 u32 xflags;
192
193 /* Replay detection notification settings */
194 u32 replay_maxage;
195 u32 replay_maxdiff;
196
197 /* Replay detection notification timer */
198 struct timer_list rtimer;
199
200 /* Statistics */
201 struct xfrm_stats stats;
202
203 struct xfrm_lifetime_cur curlft;
204 struct tasklet_hrtimer mtimer;
205
206 /* Last used time */
207 unsigned long lastused;
208
209 /* Reference to data common to all the instances of this
210 * transformer. */
211 const struct xfrm_type *type;
212 struct xfrm_mode *inner_mode;
213 struct xfrm_mode *inner_mode_iaf;
214 struct xfrm_mode *outer_mode;
215
216 /* Security context */
217 struct xfrm_sec_ctx *security;
218
219 /* Private data of this transformer, format is opaque,
220 * interpreted by xfrm_type methods. */
221 void *data;
222 };
223
224 static inline struct net *xs_net(struct xfrm_state *x)
225 {
226 return read_pnet(&x->xs_net);
227 }
228
229 /* xflags - make enum if more show up */
230 #define XFRM_TIME_DEFER 1
231
232 enum {
233 XFRM_STATE_VOID,
234 XFRM_STATE_ACQ,
235 XFRM_STATE_VALID,
236 XFRM_STATE_ERROR,
237 XFRM_STATE_EXPIRED,
238 XFRM_STATE_DEAD
239 };
240
241 /* callback structure passed from either netlink or pfkey */
242 struct km_event {
243 union {
244 u32 hard;
245 u32 proto;
246 u32 byid;
247 u32 aevent;
248 u32 type;
249 } data;
250
251 u32 seq;
252 u32 pid;
253 u32 event;
254 struct net *net;
255 };
256
257 struct net_device;
258 struct xfrm_type;
259 struct xfrm_dst;
260 struct xfrm_policy_afinfo {
261 unsigned short family;
262 struct dst_ops *dst_ops;
263 void (*garbage_collect)(struct net *net);
264 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
265 xfrm_address_t *saddr,
266 xfrm_address_t *daddr);
267 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
268 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
269 void (*decode_session)(struct sk_buff *skb,
270 struct flowi *fl,
271 int reverse);
272 int (*get_tos)(struct flowi *fl);
273 int (*init_path)(struct xfrm_dst *path,
274 struct dst_entry *dst,
275 int nfheader_len);
276 int (*fill_dst)(struct xfrm_dst *xdst,
277 struct net_device *dev);
278 };
279
280 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
281 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
282 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
283 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
284
285 struct xfrm_tmpl;
286 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
287 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
288 extern int __xfrm_state_delete(struct xfrm_state *x);
289
290 struct xfrm_state_afinfo {
291 unsigned int family;
292 unsigned int proto;
293 __be16 eth_proto;
294 struct module *owner;
295 const struct xfrm_type *type_map[IPPROTO_MAX];
296 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
297 int (*init_flags)(struct xfrm_state *x);
298 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
299 struct xfrm_tmpl *tmpl,
300 xfrm_address_t *daddr, xfrm_address_t *saddr);
301 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
302 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
303 int (*output)(struct sk_buff *skb);
304 int (*extract_input)(struct xfrm_state *x,
305 struct sk_buff *skb);
306 int (*extract_output)(struct xfrm_state *x,
307 struct sk_buff *skb);
308 int (*transport_finish)(struct sk_buff *skb,
309 int async);
310 };
311
312 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
313 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
314
315 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
316
317 struct xfrm_type {
318 char *description;
319 struct module *owner;
320 __u8 proto;
321 __u8 flags;
322 #define XFRM_TYPE_NON_FRAGMENT 1
323 #define XFRM_TYPE_REPLAY_PROT 2
324 #define XFRM_TYPE_LOCAL_COADDR 4
325 #define XFRM_TYPE_REMOTE_COADDR 8
326
327 int (*init_state)(struct xfrm_state *x);
328 void (*destructor)(struct xfrm_state *);
329 int (*input)(struct xfrm_state *, struct sk_buff *skb);
330 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
331 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
332 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
333 /* Estimate maximal size of result of transformation of a dgram */
334 u32 (*get_mtu)(struct xfrm_state *, int size);
335 };
336
337 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
338 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
339
340 struct xfrm_mode {
341 /*
342 * Remove encapsulation header.
343 *
344 * The IP header will be moved over the top of the encapsulation
345 * header.
346 *
347 * On entry, the transport header shall point to where the IP header
348 * should be and the network header shall be set to where the IP
349 * header currently is. skb->data shall point to the start of the
350 * payload.
351 */
352 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
353
354 /*
355 * This is the actual input entry point.
356 *
357 * For transport mode and equivalent this would be identical to
358 * input2 (which does not need to be set). While tunnel mode
359 * and equivalent would set this to the tunnel encapsulation function
360 * xfrm4_prepare_input that would in turn call input2.
361 */
362 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
363
364 /*
365 * Add encapsulation header.
366 *
367 * On exit, the transport header will be set to the start of the
368 * encapsulation header to be filled in by x->type->output and
369 * the mac header will be set to the nextheader (protocol for
370 * IPv4) field of the extension header directly preceding the
371 * encapsulation header, or in its absence, that of the top IP
372 * header. The value of the network header will always point
373 * to the top IP header while skb->data will point to the payload.
374 */
375 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
376
377 /*
378 * This is the actual output entry point.
379 *
380 * For transport mode and equivalent this would be identical to
381 * output2 (which does not need to be set). While tunnel mode
382 * and equivalent would set this to a tunnel encapsulation function
383 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
384 * call output2.
385 */
386 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
387
388 struct xfrm_state_afinfo *afinfo;
389 struct module *owner;
390 unsigned int encap;
391 int flags;
392 };
393
394 /* Flags for xfrm_mode. */
395 enum {
396 XFRM_MODE_FLAG_TUNNEL = 1,
397 };
398
399 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
400 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
401
402 static inline int xfrm_af2proto(unsigned int family)
403 {
404 switch(family) {
405 case AF_INET:
406 return IPPROTO_IPIP;
407 case AF_INET6:
408 return IPPROTO_IPV6;
409 default:
410 return 0;
411 }
412 }
413
414 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
415 {
416 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
417 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
418 return x->inner_mode;
419 else
420 return x->inner_mode_iaf;
421 }
422
423 struct xfrm_tmpl {
424 /* id in template is interpreted as:
425 * daddr - destination of tunnel, may be zero for transport mode.
426 * spi - zero to acquire spi. Not zero if spi is static, then
427 * daddr must be fixed too.
428 * proto - AH/ESP/IPCOMP
429 */
430 struct xfrm_id id;
431
432 /* Source address of tunnel. Ignored, if it is not a tunnel. */
433 xfrm_address_t saddr;
434
435 unsigned short encap_family;
436
437 __u32 reqid;
438
439 /* Mode: transport, tunnel etc. */
440 __u8 mode;
441
442 /* Sharing mode: unique, this session only, this user only etc. */
443 __u8 share;
444
445 /* May skip this transfomration if no SA is found */
446 __u8 optional;
447
448 /* Skip aalgos/ealgos/calgos checks. */
449 __u8 allalgs;
450
451 /* Bit mask of algos allowed for acquisition */
452 __u32 aalgos;
453 __u32 ealgos;
454 __u32 calgos;
455 };
456
457 #define XFRM_MAX_DEPTH 6
458
459 struct xfrm_policy_walk_entry {
460 struct list_head all;
461 u8 dead;
462 };
463
464 struct xfrm_policy_walk {
465 struct xfrm_policy_walk_entry walk;
466 u8 type;
467 u32 seq;
468 };
469
470 struct xfrm_policy {
471 #ifdef CONFIG_NET_NS
472 struct net *xp_net;
473 #endif
474 struct hlist_node bydst;
475 struct hlist_node byidx;
476
477 /* This lock only affects elements except for entry. */
478 rwlock_t lock;
479 atomic_t refcnt;
480 struct timer_list timer;
481
482 u32 priority;
483 u32 index;
484 struct xfrm_selector selector;
485 struct xfrm_lifetime_cfg lft;
486 struct xfrm_lifetime_cur curlft;
487 struct dst_entry *bundles;
488 struct xfrm_policy_walk_entry walk;
489 u8 type;
490 u8 action;
491 u8 flags;
492 u8 xfrm_nr;
493 u16 family;
494 struct xfrm_sec_ctx *security;
495 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
496 };
497
498 static inline struct net *xp_net(struct xfrm_policy *xp)
499 {
500 return read_pnet(&xp->xp_net);
501 }
502
503 struct xfrm_kmaddress {
504 xfrm_address_t local;
505 xfrm_address_t remote;
506 u32 reserved;
507 u16 family;
508 };
509
510 struct xfrm_migrate {
511 xfrm_address_t old_daddr;
512 xfrm_address_t old_saddr;
513 xfrm_address_t new_daddr;
514 xfrm_address_t new_saddr;
515 u8 proto;
516 u8 mode;
517 u16 reserved;
518 u32 reqid;
519 u16 old_family;
520 u16 new_family;
521 };
522
523 #define XFRM_KM_TIMEOUT 30
524 /* which seqno */
525 #define XFRM_REPLAY_SEQ 1
526 #define XFRM_REPLAY_OSEQ 2
527 #define XFRM_REPLAY_SEQ_MASK 3
528 /* what happened */
529 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
530 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
531
532 /* default aevent timeout in units of 100ms */
533 #define XFRM_AE_ETIME 10
534 /* Async Event timer multiplier */
535 #define XFRM_AE_ETH_M 10
536 /* default seq threshold size */
537 #define XFRM_AE_SEQT_SIZE 2
538
539 struct xfrm_mgr {
540 struct list_head list;
541 char *id;
542 int (*notify)(struct xfrm_state *x, struct km_event *c);
543 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
544 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
545 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
546 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
547 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
548 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
549 };
550
551 extern int xfrm_register_km(struct xfrm_mgr *km);
552 extern int xfrm_unregister_km(struct xfrm_mgr *km);
553
554 /*
555 * This structure is used for the duration where packets are being
556 * transformed by IPsec. As soon as the packet leaves IPsec the
557 * area beyond the generic IP part may be overwritten.
558 */
559 struct xfrm_skb_cb {
560 union {
561 struct inet_skb_parm h4;
562 struct inet6_skb_parm h6;
563 } header;
564
565 /* Sequence number for replay protection. */
566 union {
567 u64 output;
568 __be32 input;
569 } seq;
570 };
571
572 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
573
574 /*
575 * This structure is used by the afinfo prepare_input/prepare_output functions
576 * to transmit header information to the mode input/output functions.
577 */
578 struct xfrm_mode_skb_cb {
579 union {
580 struct inet_skb_parm h4;
581 struct inet6_skb_parm h6;
582 } header;
583
584 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
585 __be16 id;
586 __be16 frag_off;
587
588 /* IP header length (excluding options or extension headers). */
589 u8 ihl;
590
591 /* TOS for IPv4, class for IPv6. */
592 u8 tos;
593
594 /* TTL for IPv4, hop limitfor IPv6. */
595 u8 ttl;
596
597 /* Protocol for IPv4, NH for IPv6. */
598 u8 protocol;
599
600 /* Option length for IPv4, zero for IPv6. */
601 u8 optlen;
602
603 /* Used by IPv6 only, zero for IPv4. */
604 u8 flow_lbl[3];
605 };
606
607 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
608
609 /*
610 * This structure is used by the input processing to locate the SPI and
611 * related information.
612 */
613 struct xfrm_spi_skb_cb {
614 union {
615 struct inet_skb_parm h4;
616 struct inet6_skb_parm h6;
617 } header;
618
619 unsigned int daddroff;
620 unsigned int family;
621 };
622
623 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
624
625 /* Audit Information */
626 struct xfrm_audit {
627 u32 secid;
628 uid_t loginuid;
629 u32 sessionid;
630 };
631
632 #ifdef CONFIG_AUDITSYSCALL
633 static inline struct audit_buffer *xfrm_audit_start(const char *op)
634 {
635 struct audit_buffer *audit_buf = NULL;
636
637 if (audit_enabled == 0)
638 return NULL;
639 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
640 AUDIT_MAC_IPSEC_EVENT);
641 if (audit_buf == NULL)
642 return NULL;
643 audit_log_format(audit_buf, "op=%s", op);
644 return audit_buf;
645 }
646
647 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
648 struct audit_buffer *audit_buf)
649 {
650 char *secctx;
651 u32 secctx_len;
652
653 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
654 if (secid != 0 &&
655 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
656 audit_log_format(audit_buf, " subj=%s", secctx);
657 security_release_secctx(secctx, secctx_len);
658 } else
659 audit_log_task_context(audit_buf);
660 }
661
662 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
663 u32 auid, u32 ses, u32 secid);
664 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
665 u32 auid, u32 ses, u32 secid);
666 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
667 u32 auid, u32 ses, u32 secid);
668 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
669 u32 auid, u32 ses, u32 secid);
670 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
671 struct sk_buff *skb);
672 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
673 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
674 __be32 net_spi, __be32 net_seq);
675 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
676 struct sk_buff *skb, u8 proto);
677 #else
678
679 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
680 u32 auid, u32 ses, u32 secid)
681 {
682 }
683
684 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
685 u32 auid, u32 ses, u32 secid)
686 {
687 }
688
689 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
690 u32 auid, u32 ses, u32 secid)
691 {
692 }
693
694 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
695 u32 auid, u32 ses, u32 secid)
696 {
697 }
698
699 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
700 struct sk_buff *skb)
701 {
702 }
703
704 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
705 u16 family)
706 {
707 }
708
709 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
710 __be32 net_spi, __be32 net_seq)
711 {
712 }
713
714 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
715 struct sk_buff *skb, u8 proto)
716 {
717 }
718 #endif /* CONFIG_AUDITSYSCALL */
719
720 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
721 {
722 if (likely(policy != NULL))
723 atomic_inc(&policy->refcnt);
724 }
725
726 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
727
728 static inline void xfrm_pol_put(struct xfrm_policy *policy)
729 {
730 if (atomic_dec_and_test(&policy->refcnt))
731 xfrm_policy_destroy(policy);
732 }
733
734 #ifdef CONFIG_XFRM_SUB_POLICY
735 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
736 {
737 int i;
738 for (i = npols - 1; i >= 0; --i)
739 xfrm_pol_put(pols[i]);
740 }
741 #else
742 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
743 {
744 xfrm_pol_put(pols[0]);
745 }
746 #endif
747
748 extern void __xfrm_state_destroy(struct xfrm_state *);
749
750 static inline void __xfrm_state_put(struct xfrm_state *x)
751 {
752 atomic_dec(&x->refcnt);
753 }
754
755 static inline void xfrm_state_put(struct xfrm_state *x)
756 {
757 if (atomic_dec_and_test(&x->refcnt))
758 __xfrm_state_destroy(x);
759 }
760
761 static inline void xfrm_state_hold(struct xfrm_state *x)
762 {
763 atomic_inc(&x->refcnt);
764 }
765
766 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
767 {
768 __be32 *a1 = token1;
769 __be32 *a2 = token2;
770 int pdw;
771 int pbi;
772
773 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
774 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
775
776 if (pdw)
777 if (memcmp(a1, a2, pdw << 2))
778 return 0;
779
780 if (pbi) {
781 __be32 mask;
782
783 mask = htonl((0xffffffff) << (32 - pbi));
784
785 if ((a1[pdw] ^ a2[pdw]) & mask)
786 return 0;
787 }
788
789 return 1;
790 }
791
792 static __inline__
793 __be16 xfrm_flowi_sport(struct flowi *fl)
794 {
795 __be16 port;
796 switch(fl->proto) {
797 case IPPROTO_TCP:
798 case IPPROTO_UDP:
799 case IPPROTO_UDPLITE:
800 case IPPROTO_SCTP:
801 port = fl->fl_ip_sport;
802 break;
803 case IPPROTO_ICMP:
804 case IPPROTO_ICMPV6:
805 port = htons(fl->fl_icmp_type);
806 break;
807 case IPPROTO_MH:
808 port = htons(fl->fl_mh_type);
809 break;
810 default:
811 port = 0; /*XXX*/
812 }
813 return port;
814 }
815
816 static __inline__
817 __be16 xfrm_flowi_dport(struct flowi *fl)
818 {
819 __be16 port;
820 switch(fl->proto) {
821 case IPPROTO_TCP:
822 case IPPROTO_UDP:
823 case IPPROTO_UDPLITE:
824 case IPPROTO_SCTP:
825 port = fl->fl_ip_dport;
826 break;
827 case IPPROTO_ICMP:
828 case IPPROTO_ICMPV6:
829 port = htons(fl->fl_icmp_code);
830 break;
831 default:
832 port = 0; /*XXX*/
833 }
834 return port;
835 }
836
837 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
838 unsigned short family);
839
840 #ifdef CONFIG_SECURITY_NETWORK_XFRM
841 /* If neither has a context --> match
842 * Otherwise, both must have a context and the sids, doi, alg must match
843 */
844 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
845 {
846 return ((!s1 && !s2) ||
847 (s1 && s2 &&
848 (s1->ctx_sid == s2->ctx_sid) &&
849 (s1->ctx_doi == s2->ctx_doi) &&
850 (s1->ctx_alg == s2->ctx_alg)));
851 }
852 #else
853 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
854 {
855 return 1;
856 }
857 #endif
858
859 /* A struct encoding bundle of transformations to apply to some set of flow.
860 *
861 * dst->child points to the next element of bundle.
862 * dst->xfrm points to an instanse of transformer.
863 *
864 * Due to unfortunate limitations of current routing cache, which we
865 * have no time to fix, it mirrors struct rtable and bound to the same
866 * routing key, including saddr,daddr. However, we can have many of
867 * bundles differing by session id. All the bundles grow from a parent
868 * policy rule.
869 */
870 struct xfrm_dst {
871 union {
872 struct dst_entry dst;
873 struct rtable rt;
874 struct rt6_info rt6;
875 } u;
876 struct dst_entry *route;
877 #ifdef CONFIG_XFRM_SUB_POLICY
878 struct flowi *origin;
879 struct xfrm_selector *partner;
880 #endif
881 u32 genid;
882 u32 route_mtu_cached;
883 u32 child_mtu_cached;
884 u32 route_cookie;
885 u32 path_cookie;
886 };
887
888 #ifdef CONFIG_XFRM
889 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
890 {
891 dst_release(xdst->route);
892 if (likely(xdst->u.dst.xfrm))
893 xfrm_state_put(xdst->u.dst.xfrm);
894 #ifdef CONFIG_XFRM_SUB_POLICY
895 kfree(xdst->origin);
896 xdst->origin = NULL;
897 kfree(xdst->partner);
898 xdst->partner = NULL;
899 #endif
900 }
901 #endif
902
903 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
904
905 struct sec_path {
906 atomic_t refcnt;
907 int len;
908 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
909 };
910
911 static inline struct sec_path *
912 secpath_get(struct sec_path *sp)
913 {
914 if (sp)
915 atomic_inc(&sp->refcnt);
916 return sp;
917 }
918
919 extern void __secpath_destroy(struct sec_path *sp);
920
921 static inline void
922 secpath_put(struct sec_path *sp)
923 {
924 if (sp && atomic_dec_and_test(&sp->refcnt))
925 __secpath_destroy(sp);
926 }
927
928 extern struct sec_path *secpath_dup(struct sec_path *src);
929
930 static inline void
931 secpath_reset(struct sk_buff *skb)
932 {
933 #ifdef CONFIG_XFRM
934 secpath_put(skb->sp);
935 skb->sp = NULL;
936 #endif
937 }
938
939 static inline int
940 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
941 {
942 switch (family) {
943 case AF_INET:
944 return addr->a4 == 0;
945 case AF_INET6:
946 return ipv6_addr_any((struct in6_addr *)&addr->a6);
947 }
948 return 0;
949 }
950
951 static inline int
952 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
953 {
954 return (tmpl->saddr.a4 &&
955 tmpl->saddr.a4 != x->props.saddr.a4);
956 }
957
958 static inline int
959 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
960 {
961 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
962 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
963 }
964
965 static inline int
966 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
967 {
968 switch (family) {
969 case AF_INET:
970 return __xfrm4_state_addr_cmp(tmpl, x);
971 case AF_INET6:
972 return __xfrm6_state_addr_cmp(tmpl, x);
973 }
974 return !0;
975 }
976
977 #ifdef CONFIG_XFRM
978 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
979
980 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
981 struct sk_buff *skb,
982 unsigned int family, int reverse)
983 {
984 struct net *net = dev_net(skb->dev);
985 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
986
987 if (sk && sk->sk_policy[XFRM_POLICY_IN])
988 return __xfrm_policy_check(sk, ndir, skb, family);
989
990 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
991 (skb_dst(skb)->flags & DST_NOPOLICY) ||
992 __xfrm_policy_check(sk, ndir, skb, family);
993 }
994
995 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
996 {
997 return __xfrm_policy_check2(sk, dir, skb, family, 0);
998 }
999
1000 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1001 {
1002 return xfrm_policy_check(sk, dir, skb, AF_INET);
1003 }
1004
1005 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1006 {
1007 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1008 }
1009
1010 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1011 struct sk_buff *skb)
1012 {
1013 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1014 }
1015
1016 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1017 struct sk_buff *skb)
1018 {
1019 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1020 }
1021
1022 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1023 unsigned int family, int reverse);
1024
1025 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1026 unsigned int family)
1027 {
1028 return __xfrm_decode_session(skb, fl, family, 0);
1029 }
1030
1031 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1032 struct flowi *fl,
1033 unsigned int family)
1034 {
1035 return __xfrm_decode_session(skb, fl, family, 1);
1036 }
1037
1038 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1039
1040 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1041 {
1042 struct net *net = dev_net(skb->dev);
1043
1044 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1045 (skb_dst(skb)->flags & DST_NOXFRM) ||
1046 __xfrm_route_forward(skb, family);
1047 }
1048
1049 static inline int xfrm4_route_forward(struct sk_buff *skb)
1050 {
1051 return xfrm_route_forward(skb, AF_INET);
1052 }
1053
1054 static inline int xfrm6_route_forward(struct sk_buff *skb)
1055 {
1056 return xfrm_route_forward(skb, AF_INET6);
1057 }
1058
1059 extern int __xfrm_sk_clone_policy(struct sock *sk);
1060
1061 static inline int xfrm_sk_clone_policy(struct sock *sk)
1062 {
1063 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1064 return __xfrm_sk_clone_policy(sk);
1065 return 0;
1066 }
1067
1068 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1069
1070 static inline void xfrm_sk_free_policy(struct sock *sk)
1071 {
1072 if (unlikely(sk->sk_policy[0] != NULL)) {
1073 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1074 sk->sk_policy[0] = NULL;
1075 }
1076 if (unlikely(sk->sk_policy[1] != NULL)) {
1077 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1078 sk->sk_policy[1] = NULL;
1079 }
1080 }
1081
1082 #else
1083
1084 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1085 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1086 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1087 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1088 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1089 {
1090 return 1;
1091 }
1092 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1093 {
1094 return 1;
1095 }
1096 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1097 {
1098 return 1;
1099 }
1100 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1101 struct flowi *fl,
1102 unsigned int family)
1103 {
1104 return -ENOSYS;
1105 }
1106 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1107 struct sk_buff *skb)
1108 {
1109 return 1;
1110 }
1111 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1112 struct sk_buff *skb)
1113 {
1114 return 1;
1115 }
1116 #endif
1117
1118 static __inline__
1119 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1120 {
1121 switch (family){
1122 case AF_INET:
1123 return (xfrm_address_t *)&fl->fl4_dst;
1124 case AF_INET6:
1125 return (xfrm_address_t *)&fl->fl6_dst;
1126 }
1127 return NULL;
1128 }
1129
1130 static __inline__
1131 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1132 {
1133 switch (family){
1134 case AF_INET:
1135 return (xfrm_address_t *)&fl->fl4_src;
1136 case AF_INET6:
1137 return (xfrm_address_t *)&fl->fl6_src;
1138 }
1139 return NULL;
1140 }
1141
1142 static __inline__
1143 void xfrm_flowi_addr_get(struct flowi *fl,
1144 xfrm_address_t *saddr, xfrm_address_t *daddr,
1145 unsigned short family)
1146 {
1147 switch(family) {
1148 case AF_INET:
1149 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1150 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1151 break;
1152 case AF_INET6:
1153 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1154 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1155 break;
1156 }
1157 }
1158
1159 static __inline__ int
1160 __xfrm4_state_addr_check(struct xfrm_state *x,
1161 xfrm_address_t *daddr, xfrm_address_t *saddr)
1162 {
1163 if (daddr->a4 == x->id.daddr.a4 &&
1164 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1165 return 1;
1166 return 0;
1167 }
1168
1169 static __inline__ int
1170 __xfrm6_state_addr_check(struct xfrm_state *x,
1171 xfrm_address_t *daddr, xfrm_address_t *saddr)
1172 {
1173 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1174 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1175 ipv6_addr_any((struct in6_addr *)saddr) ||
1176 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1177 return 1;
1178 return 0;
1179 }
1180
1181 static __inline__ int
1182 xfrm_state_addr_check(struct xfrm_state *x,
1183 xfrm_address_t *daddr, xfrm_address_t *saddr,
1184 unsigned short family)
1185 {
1186 switch (family) {
1187 case AF_INET:
1188 return __xfrm4_state_addr_check(x, daddr, saddr);
1189 case AF_INET6:
1190 return __xfrm6_state_addr_check(x, daddr, saddr);
1191 }
1192 return 0;
1193 }
1194
1195 static __inline__ int
1196 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1197 unsigned short family)
1198 {
1199 switch (family) {
1200 case AF_INET:
1201 return __xfrm4_state_addr_check(x,
1202 (xfrm_address_t *)&fl->fl4_dst,
1203 (xfrm_address_t *)&fl->fl4_src);
1204 case AF_INET6:
1205 return __xfrm6_state_addr_check(x,
1206 (xfrm_address_t *)&fl->fl6_dst,
1207 (xfrm_address_t *)&fl->fl6_src);
1208 }
1209 return 0;
1210 }
1211
1212 static inline int xfrm_state_kern(struct xfrm_state *x)
1213 {
1214 return atomic_read(&x->tunnel_users);
1215 }
1216
1217 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1218 {
1219 return (!userproto || proto == userproto ||
1220 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1221 proto == IPPROTO_ESP ||
1222 proto == IPPROTO_COMP)));
1223 }
1224
1225 /*
1226 * xfrm algorithm information
1227 */
1228 struct xfrm_algo_aead_info {
1229 u16 icv_truncbits;
1230 };
1231
1232 struct xfrm_algo_auth_info {
1233 u16 icv_truncbits;
1234 u16 icv_fullbits;
1235 };
1236
1237 struct xfrm_algo_encr_info {
1238 u16 blockbits;
1239 u16 defkeybits;
1240 };
1241
1242 struct xfrm_algo_comp_info {
1243 u16 threshold;
1244 };
1245
1246 struct xfrm_algo_desc {
1247 char *name;
1248 char *compat;
1249 u8 available:1;
1250 union {
1251 struct xfrm_algo_aead_info aead;
1252 struct xfrm_algo_auth_info auth;
1253 struct xfrm_algo_encr_info encr;
1254 struct xfrm_algo_comp_info comp;
1255 } uinfo;
1256 struct sadb_alg desc;
1257 };
1258
1259 /* XFRM tunnel handlers. */
1260 struct xfrm_tunnel {
1261 int (*handler)(struct sk_buff *skb);
1262 int (*err_handler)(struct sk_buff *skb, __u32 info);
1263
1264 struct xfrm_tunnel *next;
1265 int priority;
1266 };
1267
1268 struct xfrm6_tunnel {
1269 int (*handler)(struct sk_buff *skb);
1270 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1271 u8 type, u8 code, int offset, __be32 info);
1272 struct xfrm6_tunnel *next;
1273 int priority;
1274 };
1275
1276 extern void xfrm_init(void);
1277 extern void xfrm4_init(int rt_hash_size);
1278 extern int xfrm_state_init(struct net *net);
1279 extern void xfrm_state_fini(struct net *net);
1280 extern void xfrm4_state_init(void);
1281 #ifdef CONFIG_XFRM
1282 extern int xfrm6_init(void);
1283 extern void xfrm6_fini(void);
1284 extern int xfrm6_state_init(void);
1285 extern void xfrm6_state_fini(void);
1286 #else
1287 static inline int xfrm6_init(void)
1288 {
1289 return 0;
1290 }
1291 static inline void xfrm6_fini(void)
1292 {
1293 ;
1294 }
1295 #endif
1296
1297 #ifdef CONFIG_XFRM_STATISTICS
1298 extern int xfrm_proc_init(struct net *net);
1299 extern void xfrm_proc_fini(struct net *net);
1300 #endif
1301
1302 extern int xfrm_sysctl_init(struct net *net);
1303 #ifdef CONFIG_SYSCTL
1304 extern void xfrm_sysctl_fini(struct net *net);
1305 #else
1306 static inline void xfrm_sysctl_fini(struct net *net)
1307 {
1308 }
1309 #endif
1310
1311 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1312 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1313 int (*func)(struct xfrm_state *, int, void*), void *);
1314 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1315 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1316 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1317 struct flowi *fl, struct xfrm_tmpl *tmpl,
1318 struct xfrm_policy *pol, int *err,
1319 unsigned short family);
1320 extern struct xfrm_state * xfrm_stateonly_find(struct net *net,
1321 xfrm_address_t *daddr,
1322 xfrm_address_t *saddr,
1323 unsigned short family,
1324 u8 mode, u8 proto, u32 reqid);
1325 extern int xfrm_state_check_expire(struct xfrm_state *x);
1326 extern void xfrm_state_insert(struct xfrm_state *x);
1327 extern int xfrm_state_add(struct xfrm_state *x);
1328 extern int xfrm_state_update(struct xfrm_state *x);
1329 extern struct xfrm_state *xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1330 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1331 #ifdef CONFIG_XFRM_SUB_POLICY
1332 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1333 int n, unsigned short family);
1334 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1335 int n, unsigned short family);
1336 #else
1337 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1338 int n, unsigned short family)
1339 {
1340 return -ENOSYS;
1341 }
1342
1343 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1344 int n, unsigned short family)
1345 {
1346 return -ENOSYS;
1347 }
1348 #endif
1349
1350 struct xfrmk_sadinfo {
1351 u32 sadhcnt; /* current hash bkts */
1352 u32 sadhmcnt; /* max allowed hash bkts */
1353 u32 sadcnt; /* current running count */
1354 };
1355
1356 struct xfrmk_spdinfo {
1357 u32 incnt;
1358 u32 outcnt;
1359 u32 fwdcnt;
1360 u32 inscnt;
1361 u32 outscnt;
1362 u32 fwdscnt;
1363 u32 spdhcnt;
1364 u32 spdhmcnt;
1365 };
1366
1367 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq);
1368 extern int xfrm_state_delete(struct xfrm_state *x);
1369 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1370 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1371 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1372 extern int xfrm_replay_check(struct xfrm_state *x,
1373 struct sk_buff *skb, __be32 seq);
1374 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1375 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1376 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1377 extern int xfrm_init_state(struct xfrm_state *x);
1378 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1379 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1380 int encap_type);
1381 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1382 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1383 extern int xfrm_output(struct sk_buff *skb);
1384 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1385 extern int xfrm4_extract_header(struct sk_buff *skb);
1386 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1387 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1388 int encap_type);
1389 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1390 extern int xfrm4_rcv(struct sk_buff *skb);
1391
1392 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1393 {
1394 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1395 }
1396
1397 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1398 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1399 extern int xfrm4_output(struct sk_buff *skb);
1400 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1401 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1402 extern int xfrm6_extract_header(struct sk_buff *skb);
1403 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1404 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1405 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1406 extern int xfrm6_rcv(struct sk_buff *skb);
1407 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1408 xfrm_address_t *saddr, u8 proto);
1409 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1410 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1411 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1412 extern void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr);
1413 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
1414 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1415 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1416 extern int xfrm6_output(struct sk_buff *skb);
1417 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1418 u8 **prevhdr);
1419
1420 #ifdef CONFIG_XFRM
1421 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1422 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1423 #else
1424 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1425 {
1426 return -ENOPROTOOPT;
1427 }
1428
1429 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1430 {
1431 /* should not happen */
1432 kfree_skb(skb);
1433 return 0;
1434 }
1435 #endif
1436
1437 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1438
1439 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1440 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1441 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1442 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1443 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1444 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir,
1445 struct xfrm_selector *sel,
1446 struct xfrm_sec_ctx *ctx, int delete,
1447 int *err);
1448 struct xfrm_policy *xfrm_policy_byid(struct net *net, u8, int dir, u32 id, int delete, int *err);
1449 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1450 u32 xfrm_get_acqseq(void);
1451 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1452 struct xfrm_state * xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1453 xfrm_address_t *daddr, xfrm_address_t *saddr,
1454 int create, unsigned short family);
1455 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1456 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1457 struct flowi *fl, int family, int strict);
1458
1459 #ifdef CONFIG_XFRM_MIGRATE
1460 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1461 struct xfrm_migrate *m, int num_bundles,
1462 struct xfrm_kmaddress *k);
1463 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1464 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1465 struct xfrm_migrate *m);
1466 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1467 struct xfrm_migrate *m, int num_bundles,
1468 struct xfrm_kmaddress *k);
1469 #endif
1470
1471 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1472 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1473 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1474
1475 extern void xfrm_input_init(void);
1476 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1477
1478 extern void xfrm_probe_algs(void);
1479 extern int xfrm_count_auth_supported(void);
1480 extern int xfrm_count_enc_supported(void);
1481 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1482 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1483 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1484 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1485 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1486 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1487 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1488 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1489 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1490 int probe);
1491
1492 struct hash_desc;
1493 struct scatterlist;
1494 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1495 unsigned int);
1496
1497 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1498 int family)
1499 {
1500 switch (family) {
1501 default:
1502 case AF_INET:
1503 return (__force __u32)a->a4 - (__force __u32)b->a4;
1504 case AF_INET6:
1505 return ipv6_addr_cmp((struct in6_addr *)a,
1506 (struct in6_addr *)b);
1507 }
1508 }
1509
1510 static inline int xfrm_policy_id2dir(u32 index)
1511 {
1512 return index & 7;
1513 }
1514
1515 #ifdef CONFIG_XFRM
1516 static inline int xfrm_aevent_is_on(struct net *net)
1517 {
1518 struct sock *nlsk;
1519 int ret = 0;
1520
1521 rcu_read_lock();
1522 nlsk = rcu_dereference(net->xfrm.nlsk);
1523 if (nlsk)
1524 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1525 rcu_read_unlock();
1526 return ret;
1527 }
1528 #endif
1529
1530 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1531 {
1532 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1533 }
1534
1535 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1536 {
1537 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1538 }
1539
1540 #ifdef CONFIG_XFRM_MIGRATE
1541 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1542 {
1543 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1544 }
1545
1546 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1547 {
1548 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1549 }
1550
1551 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1552 {
1553 int i;
1554 for (i = 0; i < n; i++)
1555 xfrm_state_put(*(states + i));
1556 }
1557
1558 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1559 {
1560 int i;
1561 for (i = 0; i < n; i++)
1562 xfrm_state_delete(*(states + i));
1563 }
1564 #endif
1565
1566 #ifdef CONFIG_XFRM
1567 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1568 {
1569 return skb->sp->xvec[skb->sp->len - 1];
1570 }
1571 #endif
1572
1573 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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