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Linux 4.6-rc6
[cris-mirror.git] / include / net / xfrm.h
blobd6f6e5006ee9e3cb8dcd61e151fcc95ce165eab9
1 #ifndef _NET_XFRM_H
2 #define _NET_XFRM_H
3
4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
15 #include <linux/slab.h>
16
17 #include <net/sock.h>
18 #include <net/dst.h>
19 #include <net/ip.h>
20 #include <net/route.h>
21 #include <net/ipv6.h>
22 #include <net/ip6_fib.h>
23 #include <net/flow.h>
24
25 #include <linux/interrupt.h>
26
27 #ifdef CONFIG_XFRM_STATISTICS
28 #include <net/snmp.h>
29 #endif
30
31 #define XFRM_PROTO_ESP 50
32 #define XFRM_PROTO_AH 51
33 #define XFRM_PROTO_COMP 108
34 #define XFRM_PROTO_IPIP 4
35 #define XFRM_PROTO_IPV6 41
36 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46 #ifdef CONFIG_XFRM_STATISTICS
47 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50 #else
51 #define XFRM_INC_STATS(net, field) ((void)(net))
52 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
53 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
54 #endif
55
56
57 /* Organization of SPD aka "XFRM rules"
58 ------------------------------------
59
60 Basic objects:
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
65
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
70
71 Lookup is plain linear search until the first match with selector.
72
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
79
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
83 |---. child .-> NULL
84
85 Bundles are cached at xrfm_policy struct (field ->bundles).
86
87
88 Resolution of xrfm_tmpl
89 -----------------------
90 Template contains:
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
101 flow id?
102
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
106
107 PROBLEMS:
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116 */
117
118 struct xfrm_state_walk {
119 struct list_head all;
120 u8 state;
121 u8 dying;
122 u8 proto;
123 u32 seq;
124 struct xfrm_address_filter *filter;
125 };
126
127 /* Full description of state of transformer. */
128 struct xfrm_state {
129 possible_net_t xs_net;
130 union {
131 struct hlist_node gclist;
132 struct hlist_node bydst;
133 };
134 struct hlist_node bysrc;
135 struct hlist_node byspi;
136
137 atomic_t refcnt;
138 spinlock_t lock;
139
140 struct xfrm_id id;
141 struct xfrm_selector sel;
142 struct xfrm_mark mark;
143 u32 tfcpad;
144
145 u32 genid;
146
147 /* Key manager bits */
148 struct xfrm_state_walk km;
149
150 /* Parameters of this state. */
151 struct {
152 u32 reqid;
153 u8 mode;
154 u8 replay_window;
155 u8 aalgo, ealgo, calgo;
156 u8 flags;
157 u16 family;
158 xfrm_address_t saddr;
159 int header_len;
160 int trailer_len;
161 u32 extra_flags;
162 } props;
163
164 struct xfrm_lifetime_cfg lft;
165
166 /* Data for transformer */
167 struct xfrm_algo_auth *aalg;
168 struct xfrm_algo *ealg;
169 struct xfrm_algo *calg;
170 struct xfrm_algo_aead *aead;
171 const char *geniv;
172
173 /* Data for encapsulator */
174 struct xfrm_encap_tmpl *encap;
175
176 /* Data for care-of address */
177 xfrm_address_t *coaddr;
178
179 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
180 struct xfrm_state *tunnel;
181
182 /* If a tunnel, number of users + 1 */
183 atomic_t tunnel_users;
184
185 /* State for replay detection */
186 struct xfrm_replay_state replay;
187 struct xfrm_replay_state_esn *replay_esn;
188
189 /* Replay detection state at the time we sent the last notification */
190 struct xfrm_replay_state preplay;
191 struct xfrm_replay_state_esn *preplay_esn;
192
193 /* The functions for replay detection. */
194 struct xfrm_replay *repl;
195
196 /* internal flag that only holds state for delayed aevent at the
197 * moment
198 */
199 u32 xflags;
200
201 /* Replay detection notification settings */
202 u32 replay_maxage;
203 u32 replay_maxdiff;
204
205 /* Replay detection notification timer */
206 struct timer_list rtimer;
207
208 /* Statistics */
209 struct xfrm_stats stats;
210
211 struct xfrm_lifetime_cur curlft;
212 struct tasklet_hrtimer mtimer;
213
214 /* used to fix curlft->add_time when changing date */
215 long saved_tmo;
216
217 /* Last used time */
218 unsigned long lastused;
219
220 /* Reference to data common to all the instances of this
221 * transformer. */
222 const struct xfrm_type *type;
223 struct xfrm_mode *inner_mode;
224 struct xfrm_mode *inner_mode_iaf;
225 struct xfrm_mode *outer_mode;
226
227 /* Security context */
228 struct xfrm_sec_ctx *security;
229
230 /* Private data of this transformer, format is opaque,
231 * interpreted by xfrm_type methods. */
232 void *data;
233 };
234
235 static inline struct net *xs_net(struct xfrm_state *x)
236 {
237 return read_pnet(&x->xs_net);
238 }
239
240 /* xflags - make enum if more show up */
241 #define XFRM_TIME_DEFER 1
242 #define XFRM_SOFT_EXPIRE 2
243
244 enum {
245 XFRM_STATE_VOID,
246 XFRM_STATE_ACQ,
247 XFRM_STATE_VALID,
248 XFRM_STATE_ERROR,
249 XFRM_STATE_EXPIRED,
250 XFRM_STATE_DEAD
251 };
252
253 /* callback structure passed from either netlink or pfkey */
254 struct km_event {
255 union {
256 u32 hard;
257 u32 proto;
258 u32 byid;
259 u32 aevent;
260 u32 type;
261 } data;
262
263 u32 seq;
264 u32 portid;
265 u32 event;
266 struct net *net;
267 };
268
269 struct xfrm_replay {
270 void (*advance)(struct xfrm_state *x, __be32 net_seq);
271 int (*check)(struct xfrm_state *x,
272 struct sk_buff *skb,
273 __be32 net_seq);
274 int (*recheck)(struct xfrm_state *x,
275 struct sk_buff *skb,
276 __be32 net_seq);
277 void (*notify)(struct xfrm_state *x, int event);
278 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
279 };
280
281 struct net_device;
282 struct xfrm_type;
283 struct xfrm_dst;
284 struct xfrm_policy_afinfo {
285 unsigned short family;
286 struct dst_ops *dst_ops;
287 void (*garbage_collect)(struct net *net);
288 struct dst_entry *(*dst_lookup)(struct net *net,
289 int tos, int oif,
290 const xfrm_address_t *saddr,
291 const xfrm_address_t *daddr);
292 int (*get_saddr)(struct net *net, int oif,
293 xfrm_address_t *saddr,
294 xfrm_address_t *daddr);
295 void (*decode_session)(struct sk_buff *skb,
296 struct flowi *fl,
297 int reverse);
298 int (*get_tos)(const struct flowi *fl);
299 int (*init_path)(struct xfrm_dst *path,
300 struct dst_entry *dst,
301 int nfheader_len);
302 int (*fill_dst)(struct xfrm_dst *xdst,
303 struct net_device *dev,
304 const struct flowi *fl);
305 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
306 };
307
308 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
309 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
310 void km_policy_notify(struct xfrm_policy *xp, int dir,
311 const struct km_event *c);
312 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
313
314 struct xfrm_tmpl;
315 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
316 struct xfrm_policy *pol);
317 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
318 int __xfrm_state_delete(struct xfrm_state *x);
319
320 struct xfrm_state_afinfo {
321 unsigned int family;
322 unsigned int proto;
323 __be16 eth_proto;
324 struct module *owner;
325 const struct xfrm_type *type_map[IPPROTO_MAX];
326 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
327 int (*init_flags)(struct xfrm_state *x);
328 void (*init_tempsel)(struct xfrm_selector *sel,
329 const struct flowi *fl);
330 void (*init_temprop)(struct xfrm_state *x,
331 const struct xfrm_tmpl *tmpl,
332 const xfrm_address_t *daddr,
333 const xfrm_address_t *saddr);
334 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
335 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
336 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
337 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
338 int (*extract_input)(struct xfrm_state *x,
339 struct sk_buff *skb);
340 int (*extract_output)(struct xfrm_state *x,
341 struct sk_buff *skb);
342 int (*transport_finish)(struct sk_buff *skb,
343 int async);
344 void (*local_error)(struct sk_buff *skb, u32 mtu);
345 };
346
347 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
348 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
349 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
350 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
351
352 struct xfrm_input_afinfo {
353 unsigned int family;
354 struct module *owner;
355 int (*callback)(struct sk_buff *skb, u8 protocol,
356 int err);
357 };
358
359 int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
360 int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
361
362 void xfrm_state_delete_tunnel(struct xfrm_state *x);
363
364 struct xfrm_type {
365 char *description;
366 struct module *owner;
367 u8 proto;
368 u8 flags;
369 #define XFRM_TYPE_NON_FRAGMENT 1
370 #define XFRM_TYPE_REPLAY_PROT 2
371 #define XFRM_TYPE_LOCAL_COADDR 4
372 #define XFRM_TYPE_REMOTE_COADDR 8
373
374 int (*init_state)(struct xfrm_state *x);
375 void (*destructor)(struct xfrm_state *);
376 int (*input)(struct xfrm_state *, struct sk_buff *skb);
377 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
378 int (*reject)(struct xfrm_state *, struct sk_buff *,
379 const struct flowi *);
380 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
381 /* Estimate maximal size of result of transformation of a dgram */
382 u32 (*get_mtu)(struct xfrm_state *, int size);
383 };
384
385 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
386 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
387
388 struct xfrm_mode {
389 /*
390 * Remove encapsulation header.
391 *
392 * The IP header will be moved over the top of the encapsulation
393 * header.
394 *
395 * On entry, the transport header shall point to where the IP header
396 * should be and the network header shall be set to where the IP
397 * header currently is. skb->data shall point to the start of the
398 * payload.
399 */
400 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
401
402 /*
403 * This is the actual input entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * input2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to the tunnel encapsulation function
408 * xfrm4_prepare_input that would in turn call input2.
409 */
410 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
411
412 /*
413 * Add encapsulation header.
414 *
415 * On exit, the transport header will be set to the start of the
416 * encapsulation header to be filled in by x->type->output and
417 * the mac header will be set to the nextheader (protocol for
418 * IPv4) field of the extension header directly preceding the
419 * encapsulation header, or in its absence, that of the top IP
420 * header. The value of the network header will always point
421 * to the top IP header while skb->data will point to the payload.
422 */
423 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
424
425 /*
426 * This is the actual output entry point.
427 *
428 * For transport mode and equivalent this would be identical to
429 * output2 (which does not need to be set). While tunnel mode
430 * and equivalent would set this to a tunnel encapsulation function
431 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
432 * call output2.
433 */
434 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
435
436 struct xfrm_state_afinfo *afinfo;
437 struct module *owner;
438 unsigned int encap;
439 int flags;
440 };
441
442 /* Flags for xfrm_mode. */
443 enum {
444 XFRM_MODE_FLAG_TUNNEL = 1,
445 };
446
447 int xfrm_register_mode(struct xfrm_mode *mode, int family);
448 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
449
450 static inline int xfrm_af2proto(unsigned int family)
451 {
452 switch(family) {
453 case AF_INET:
454 return IPPROTO_IPIP;
455 case AF_INET6:
456 return IPPROTO_IPV6;
457 default:
458 return 0;
459 }
460 }
461
462 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
463 {
464 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
465 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
466 return x->inner_mode;
467 else
468 return x->inner_mode_iaf;
469 }
470
471 struct xfrm_tmpl {
472 /* id in template is interpreted as:
473 * daddr - destination of tunnel, may be zero for transport mode.
474 * spi - zero to acquire spi. Not zero if spi is static, then
475 * daddr must be fixed too.
476 * proto - AH/ESP/IPCOMP
477 */
478 struct xfrm_id id;
479
480 /* Source address of tunnel. Ignored, if it is not a tunnel. */
481 xfrm_address_t saddr;
482
483 unsigned short encap_family;
484
485 u32 reqid;
486
487 /* Mode: transport, tunnel etc. */
488 u8 mode;
489
490 /* Sharing mode: unique, this session only, this user only etc. */
491 u8 share;
492
493 /* May skip this transfomration if no SA is found */
494 u8 optional;
495
496 /* Skip aalgos/ealgos/calgos checks. */
497 u8 allalgs;
498
499 /* Bit mask of algos allowed for acquisition */
500 u32 aalgos;
501 u32 ealgos;
502 u32 calgos;
503 };
504
505 #define XFRM_MAX_DEPTH 6
506
507 struct xfrm_policy_walk_entry {
508 struct list_head all;
509 u8 dead;
510 };
511
512 struct xfrm_policy_walk {
513 struct xfrm_policy_walk_entry walk;
514 u8 type;
515 u32 seq;
516 };
517
518 struct xfrm_policy_queue {
519 struct sk_buff_head hold_queue;
520 struct timer_list hold_timer;
521 unsigned long timeout;
522 };
523
524 struct xfrm_policy {
525 possible_net_t xp_net;
526 struct hlist_node bydst;
527 struct hlist_node byidx;
528
529 /* This lock only affects elements except for entry. */
530 rwlock_t lock;
531 atomic_t refcnt;
532 struct timer_list timer;
533
534 struct flow_cache_object flo;
535 atomic_t genid;
536 u32 priority;
537 u32 index;
538 struct xfrm_mark mark;
539 struct xfrm_selector selector;
540 struct xfrm_lifetime_cfg lft;
541 struct xfrm_lifetime_cur curlft;
542 struct xfrm_policy_walk_entry walk;
543 struct xfrm_policy_queue polq;
544 u8 type;
545 u8 action;
546 u8 flags;
547 u8 xfrm_nr;
548 u16 family;
549 struct xfrm_sec_ctx *security;
550 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
551 struct rcu_head rcu;
552 };
553
554 static inline struct net *xp_net(const struct xfrm_policy *xp)
555 {
556 return read_pnet(&xp->xp_net);
557 }
558
559 struct xfrm_kmaddress {
560 xfrm_address_t local;
561 xfrm_address_t remote;
562 u32 reserved;
563 u16 family;
564 };
565
566 struct xfrm_migrate {
567 xfrm_address_t old_daddr;
568 xfrm_address_t old_saddr;
569 xfrm_address_t new_daddr;
570 xfrm_address_t new_saddr;
571 u8 proto;
572 u8 mode;
573 u16 reserved;
574 u32 reqid;
575 u16 old_family;
576 u16 new_family;
577 };
578
579 #define XFRM_KM_TIMEOUT 30
580 /* what happened */
581 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
582 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
583
584 /* default aevent timeout in units of 100ms */
585 #define XFRM_AE_ETIME 10
586 /* Async Event timer multiplier */
587 #define XFRM_AE_ETH_M 10
588 /* default seq threshold size */
589 #define XFRM_AE_SEQT_SIZE 2
590
591 struct xfrm_mgr {
592 struct list_head list;
593 char *id;
594 int (*notify)(struct xfrm_state *x, const struct km_event *c);
595 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
596 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
597 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
598 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
599 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
600 int (*migrate)(const struct xfrm_selector *sel,
601 u8 dir, u8 type,
602 const struct xfrm_migrate *m,
603 int num_bundles,
604 const struct xfrm_kmaddress *k);
605 bool (*is_alive)(const struct km_event *c);
606 };
607
608 int xfrm_register_km(struct xfrm_mgr *km);
609 int xfrm_unregister_km(struct xfrm_mgr *km);
610
611 struct xfrm_tunnel_skb_cb {
612 union {
613 struct inet_skb_parm h4;
614 struct inet6_skb_parm h6;
615 } header;
616
617 union {
618 struct ip_tunnel *ip4;
619 struct ip6_tnl *ip6;
620 } tunnel;
621 };
622
623 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
624
625 /*
626 * This structure is used for the duration where packets are being
627 * transformed by IPsec. As soon as the packet leaves IPsec the
628 * area beyond the generic IP part may be overwritten.
629 */
630 struct xfrm_skb_cb {
631 struct xfrm_tunnel_skb_cb header;
632
633 /* Sequence number for replay protection. */
634 union {
635 struct {
636 __u32 low;
637 __u32 hi;
638 } output;
639 struct {
640 __be32 low;
641 __be32 hi;
642 } input;
643 } seq;
644 };
645
646 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
647
648 /*
649 * This structure is used by the afinfo prepare_input/prepare_output functions
650 * to transmit header information to the mode input/output functions.
651 */
652 struct xfrm_mode_skb_cb {
653 struct xfrm_tunnel_skb_cb header;
654
655 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
656 __be16 id;
657 __be16 frag_off;
658
659 /* IP header length (excluding options or extension headers). */
660 u8 ihl;
661
662 /* TOS for IPv4, class for IPv6. */
663 u8 tos;
664
665 /* TTL for IPv4, hop limitfor IPv6. */
666 u8 ttl;
667
668 /* Protocol for IPv4, NH for IPv6. */
669 u8 protocol;
670
671 /* Option length for IPv4, zero for IPv6. */
672 u8 optlen;
673
674 /* Used by IPv6 only, zero for IPv4. */
675 u8 flow_lbl[3];
676 };
677
678 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
679
680 /*
681 * This structure is used by the input processing to locate the SPI and
682 * related information.
683 */
684 struct xfrm_spi_skb_cb {
685 struct xfrm_tunnel_skb_cb header;
686
687 unsigned int daddroff;
688 unsigned int family;
689 };
690
691 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
692
693 #ifdef CONFIG_AUDITSYSCALL
694 static inline struct audit_buffer *xfrm_audit_start(const char *op)
695 {
696 struct audit_buffer *audit_buf = NULL;
697
698 if (audit_enabled == 0)
699 return NULL;
700 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
701 AUDIT_MAC_IPSEC_EVENT);
702 if (audit_buf == NULL)
703 return NULL;
704 audit_log_format(audit_buf, "op=%s", op);
705 return audit_buf;
706 }
707
708 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
709 struct audit_buffer *audit_buf)
710 {
711 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
712 audit_get_loginuid(current) :
713 INVALID_UID);
714 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
715 (unsigned int) -1;
716
717 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
718 audit_log_task_context(audit_buf);
719 }
720
721 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
722 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
723 bool task_valid);
724 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
725 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
726 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
727 struct sk_buff *skb);
728 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
729 __be32 net_seq);
730 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
731 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
732 __be32 net_seq);
733 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
734 u8 proto);
735 #else
736
737 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
738 bool task_valid)
739 {
740 }
741
742 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
743 bool task_valid)
744 {
745 }
746
747 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
748 bool task_valid)
749 {
750 }
751
752 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
753 bool task_valid)
754 {
755 }
756
757 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
758 struct sk_buff *skb)
759 {
760 }
761
762 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
763 struct sk_buff *skb, __be32 net_seq)
764 {
765 }
766
767 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
768 u16 family)
769 {
770 }
771
772 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
773 __be32 net_spi, __be32 net_seq)
774 {
775 }
776
777 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
778 struct sk_buff *skb, u8 proto)
779 {
780 }
781 #endif /* CONFIG_AUDITSYSCALL */
782
783 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
784 {
785 if (likely(policy != NULL))
786 atomic_inc(&policy->refcnt);
787 }
788
789 void xfrm_policy_destroy(struct xfrm_policy *policy);
790
791 static inline void xfrm_pol_put(struct xfrm_policy *policy)
792 {
793 if (atomic_dec_and_test(&policy->refcnt))
794 xfrm_policy_destroy(policy);
795 }
796
797 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
798 {
799 int i;
800 for (i = npols - 1; i >= 0; --i)
801 xfrm_pol_put(pols[i]);
802 }
803
804 void __xfrm_state_destroy(struct xfrm_state *);
805
806 static inline void __xfrm_state_put(struct xfrm_state *x)
807 {
808 atomic_dec(&x->refcnt);
809 }
810
811 static inline void xfrm_state_put(struct xfrm_state *x)
812 {
813 if (atomic_dec_and_test(&x->refcnt))
814 __xfrm_state_destroy(x);
815 }
816
817 static inline void xfrm_state_hold(struct xfrm_state *x)
818 {
819 atomic_inc(&x->refcnt);
820 }
821
822 static inline bool addr_match(const void *token1, const void *token2,
823 int prefixlen)
824 {
825 const __be32 *a1 = token1;
826 const __be32 *a2 = token2;
827 int pdw;
828 int pbi;
829
830 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
831 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
832
833 if (pdw)
834 if (memcmp(a1, a2, pdw << 2))
835 return false;
836
837 if (pbi) {
838 __be32 mask;
839
840 mask = htonl((0xffffffff) << (32 - pbi));
841
842 if ((a1[pdw] ^ a2[pdw]) & mask)
843 return false;
844 }
845
846 return true;
847 }
848
849 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
850 {
851 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
852 if (prefixlen == 0)
853 return true;
854 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
855 }
856
857 static __inline__
858 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
859 {
860 __be16 port;
861 switch(fl->flowi_proto) {
862 case IPPROTO_TCP:
863 case IPPROTO_UDP:
864 case IPPROTO_UDPLITE:
865 case IPPROTO_SCTP:
866 port = uli->ports.sport;
867 break;
868 case IPPROTO_ICMP:
869 case IPPROTO_ICMPV6:
870 port = htons(uli->icmpt.type);
871 break;
872 case IPPROTO_MH:
873 port = htons(uli->mht.type);
874 break;
875 case IPPROTO_GRE:
876 port = htons(ntohl(uli->gre_key) >> 16);
877 break;
878 default:
879 port = 0; /*XXX*/
880 }
881 return port;
882 }
883
884 static __inline__
885 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
886 {
887 __be16 port;
888 switch(fl->flowi_proto) {
889 case IPPROTO_TCP:
890 case IPPROTO_UDP:
891 case IPPROTO_UDPLITE:
892 case IPPROTO_SCTP:
893 port = uli->ports.dport;
894 break;
895 case IPPROTO_ICMP:
896 case IPPROTO_ICMPV6:
897 port = htons(uli->icmpt.code);
898 break;
899 case IPPROTO_GRE:
900 port = htons(ntohl(uli->gre_key) & 0xffff);
901 break;
902 default:
903 port = 0; /*XXX*/
904 }
905 return port;
906 }
907
908 bool xfrm_selector_match(const struct xfrm_selector *sel,
909 const struct flowi *fl, unsigned short family);
910
911 #ifdef CONFIG_SECURITY_NETWORK_XFRM
912 /* If neither has a context --> match
913 * Otherwise, both must have a context and the sids, doi, alg must match
914 */
915 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
916 {
917 return ((!s1 && !s2) ||
918 (s1 && s2 &&
919 (s1->ctx_sid == s2->ctx_sid) &&
920 (s1->ctx_doi == s2->ctx_doi) &&
921 (s1->ctx_alg == s2->ctx_alg)));
922 }
923 #else
924 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
925 {
926 return true;
927 }
928 #endif
929
930 /* A struct encoding bundle of transformations to apply to some set of flow.
931 *
932 * dst->child points to the next element of bundle.
933 * dst->xfrm points to an instanse of transformer.
934 *
935 * Due to unfortunate limitations of current routing cache, which we
936 * have no time to fix, it mirrors struct rtable and bound to the same
937 * routing key, including saddr,daddr. However, we can have many of
938 * bundles differing by session id. All the bundles grow from a parent
939 * policy rule.
940 */
941 struct xfrm_dst {
942 union {
943 struct dst_entry dst;
944 struct rtable rt;
945 struct rt6_info rt6;
946 } u;
947 struct dst_entry *route;
948 struct flow_cache_object flo;
949 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
950 int num_pols, num_xfrms;
951 #ifdef CONFIG_XFRM_SUB_POLICY
952 struct flowi *origin;
953 struct xfrm_selector *partner;
954 #endif
955 u32 xfrm_genid;
956 u32 policy_genid;
957 u32 route_mtu_cached;
958 u32 child_mtu_cached;
959 u32 route_cookie;
960 u32 path_cookie;
961 };
962
963 #ifdef CONFIG_XFRM
964 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
965 {
966 xfrm_pols_put(xdst->pols, xdst->num_pols);
967 dst_release(xdst->route);
968 if (likely(xdst->u.dst.xfrm))
969 xfrm_state_put(xdst->u.dst.xfrm);
970 #ifdef CONFIG_XFRM_SUB_POLICY
971 kfree(xdst->origin);
972 xdst->origin = NULL;
973 kfree(xdst->partner);
974 xdst->partner = NULL;
975 #endif
976 }
977 #endif
978
979 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
980
981 struct sec_path {
982 atomic_t refcnt;
983 int len;
984 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
985 };
986
987 static inline int secpath_exists(struct sk_buff *skb)
988 {
989 #ifdef CONFIG_XFRM
990 return skb->sp != NULL;
991 #else
992 return 0;
993 #endif
994 }
995
996 static inline struct sec_path *
997 secpath_get(struct sec_path *sp)
998 {
999 if (sp)
1000 atomic_inc(&sp->refcnt);
1001 return sp;
1002 }
1003
1004 void __secpath_destroy(struct sec_path *sp);
1005
1006 static inline void
1007 secpath_put(struct sec_path *sp)
1008 {
1009 if (sp && atomic_dec_and_test(&sp->refcnt))
1010 __secpath_destroy(sp);
1011 }
1012
1013 struct sec_path *secpath_dup(struct sec_path *src);
1014
1015 static inline void
1016 secpath_reset(struct sk_buff *skb)
1017 {
1018 #ifdef CONFIG_XFRM
1019 secpath_put(skb->sp);
1020 skb->sp = NULL;
1021 #endif
1022 }
1023
1024 static inline int
1025 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1026 {
1027 switch (family) {
1028 case AF_INET:
1029 return addr->a4 == 0;
1030 case AF_INET6:
1031 return ipv6_addr_any(&addr->in6);
1032 }
1033 return 0;
1034 }
1035
1036 static inline int
1037 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1038 {
1039 return (tmpl->saddr.a4 &&
1040 tmpl->saddr.a4 != x->props.saddr.a4);
1041 }
1042
1043 static inline int
1044 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1045 {
1046 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1047 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1048 }
1049
1050 static inline int
1051 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1052 {
1053 switch (family) {
1054 case AF_INET:
1055 return __xfrm4_state_addr_cmp(tmpl, x);
1056 case AF_INET6:
1057 return __xfrm6_state_addr_cmp(tmpl, x);
1058 }
1059 return !0;
1060 }
1061
1062 #ifdef CONFIG_XFRM
1063 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1064 unsigned short family);
1065
1066 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1067 struct sk_buff *skb,
1068 unsigned int family, int reverse)
1069 {
1070 struct net *net = dev_net(skb->dev);
1071 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1072
1073 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1074 return __xfrm_policy_check(sk, ndir, skb, family);
1075
1076 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1077 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1078 __xfrm_policy_check(sk, ndir, skb, family);
1079 }
1080
1081 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1082 {
1083 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1084 }
1085
1086 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1087 {
1088 return xfrm_policy_check(sk, dir, skb, AF_INET);
1089 }
1090
1091 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1092 {
1093 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1094 }
1095
1096 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1097 struct sk_buff *skb)
1098 {
1099 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1100 }
1101
1102 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1103 struct sk_buff *skb)
1104 {
1105 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1106 }
1107
1108 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1109 unsigned int family, int reverse);
1110
1111 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1112 unsigned int family)
1113 {
1114 return __xfrm_decode_session(skb, fl, family, 0);
1115 }
1116
1117 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1118 struct flowi *fl,
1119 unsigned int family)
1120 {
1121 return __xfrm_decode_session(skb, fl, family, 1);
1122 }
1123
1124 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1125
1126 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1127 {
1128 struct net *net = dev_net(skb->dev);
1129
1130 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1131 (skb_dst(skb)->flags & DST_NOXFRM) ||
1132 __xfrm_route_forward(skb, family);
1133 }
1134
1135 static inline int xfrm4_route_forward(struct sk_buff *skb)
1136 {
1137 return xfrm_route_forward(skb, AF_INET);
1138 }
1139
1140 static inline int xfrm6_route_forward(struct sk_buff *skb)
1141 {
1142 return xfrm_route_forward(skb, AF_INET6);
1143 }
1144
1145 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1146
1147 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1148 {
1149 sk->sk_policy[0] = NULL;
1150 sk->sk_policy[1] = NULL;
1151 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1152 return __xfrm_sk_clone_policy(sk, osk);
1153 return 0;
1154 }
1155
1156 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1157
1158 static inline void xfrm_sk_free_policy(struct sock *sk)
1159 {
1160 struct xfrm_policy *pol;
1161
1162 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1163 if (unlikely(pol != NULL)) {
1164 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1165 sk->sk_policy[0] = NULL;
1166 }
1167 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1168 if (unlikely(pol != NULL)) {
1169 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1170 sk->sk_policy[1] = NULL;
1171 }
1172 }
1173
1174 void xfrm_garbage_collect(struct net *net);
1175
1176 #else
1177
1178 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1179 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1180 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1181 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1182 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1183 {
1184 return 1;
1185 }
1186 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1187 {
1188 return 1;
1189 }
1190 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1191 {
1192 return 1;
1193 }
1194 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1195 struct flowi *fl,
1196 unsigned int family)
1197 {
1198 return -ENOSYS;
1199 }
1200 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1201 struct sk_buff *skb)
1202 {
1203 return 1;
1204 }
1205 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1206 struct sk_buff *skb)
1207 {
1208 return 1;
1209 }
1210 static inline void xfrm_garbage_collect(struct net *net)
1211 {
1212 }
1213 #endif
1214
1215 static __inline__
1216 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1217 {
1218 switch (family){
1219 case AF_INET:
1220 return (xfrm_address_t *)&fl->u.ip4.daddr;
1221 case AF_INET6:
1222 return (xfrm_address_t *)&fl->u.ip6.daddr;
1223 }
1224 return NULL;
1225 }
1226
1227 static __inline__
1228 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1229 {
1230 switch (family){
1231 case AF_INET:
1232 return (xfrm_address_t *)&fl->u.ip4.saddr;
1233 case AF_INET6:
1234 return (xfrm_address_t *)&fl->u.ip6.saddr;
1235 }
1236 return NULL;
1237 }
1238
1239 static __inline__
1240 void xfrm_flowi_addr_get(const struct flowi *fl,
1241 xfrm_address_t *saddr, xfrm_address_t *daddr,
1242 unsigned short family)
1243 {
1244 switch(family) {
1245 case AF_INET:
1246 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1247 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1248 break;
1249 case AF_INET6:
1250 saddr->in6 = fl->u.ip6.saddr;
1251 daddr->in6 = fl->u.ip6.daddr;
1252 break;
1253 }
1254 }
1255
1256 static __inline__ int
1257 __xfrm4_state_addr_check(const struct xfrm_state *x,
1258 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1259 {
1260 if (daddr->a4 == x->id.daddr.a4 &&
1261 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1262 return 1;
1263 return 0;
1264 }
1265
1266 static __inline__ int
1267 __xfrm6_state_addr_check(const struct xfrm_state *x,
1268 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1269 {
1270 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1271 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1272 ipv6_addr_any((struct in6_addr *)saddr) ||
1273 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1274 return 1;
1275 return 0;
1276 }
1277
1278 static __inline__ int
1279 xfrm_state_addr_check(const struct xfrm_state *x,
1280 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1281 unsigned short family)
1282 {
1283 switch (family) {
1284 case AF_INET:
1285 return __xfrm4_state_addr_check(x, daddr, saddr);
1286 case AF_INET6:
1287 return __xfrm6_state_addr_check(x, daddr, saddr);
1288 }
1289 return 0;
1290 }
1291
1292 static __inline__ int
1293 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1294 unsigned short family)
1295 {
1296 switch (family) {
1297 case AF_INET:
1298 return __xfrm4_state_addr_check(x,
1299 (const xfrm_address_t *)&fl->u.ip4.daddr,
1300 (const xfrm_address_t *)&fl->u.ip4.saddr);
1301 case AF_INET6:
1302 return __xfrm6_state_addr_check(x,
1303 (const xfrm_address_t *)&fl->u.ip6.daddr,
1304 (const xfrm_address_t *)&fl->u.ip6.saddr);
1305 }
1306 return 0;
1307 }
1308
1309 static inline int xfrm_state_kern(const struct xfrm_state *x)
1310 {
1311 return atomic_read(&x->tunnel_users);
1312 }
1313
1314 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1315 {
1316 return (!userproto || proto == userproto ||
1317 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1318 proto == IPPROTO_ESP ||
1319 proto == IPPROTO_COMP)));
1320 }
1321
1322 /*
1323 * xfrm algorithm information
1324 */
1325 struct xfrm_algo_aead_info {
1326 char *geniv;
1327 u16 icv_truncbits;
1328 };
1329
1330 struct xfrm_algo_auth_info {
1331 u16 icv_truncbits;
1332 u16 icv_fullbits;
1333 };
1334
1335 struct xfrm_algo_encr_info {
1336 char *geniv;
1337 u16 blockbits;
1338 u16 defkeybits;
1339 };
1340
1341 struct xfrm_algo_comp_info {
1342 u16 threshold;
1343 };
1344
1345 struct xfrm_algo_desc {
1346 char *name;
1347 char *compat;
1348 u8 available:1;
1349 u8 pfkey_supported:1;
1350 union {
1351 struct xfrm_algo_aead_info aead;
1352 struct xfrm_algo_auth_info auth;
1353 struct xfrm_algo_encr_info encr;
1354 struct xfrm_algo_comp_info comp;
1355 } uinfo;
1356 struct sadb_alg desc;
1357 };
1358
1359 /* XFRM protocol handlers. */
1360 struct xfrm4_protocol {
1361 int (*handler)(struct sk_buff *skb);
1362 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1363 int encap_type);
1364 int (*cb_handler)(struct sk_buff *skb, int err);
1365 int (*err_handler)(struct sk_buff *skb, u32 info);
1366
1367 struct xfrm4_protocol __rcu *next;
1368 int priority;
1369 };
1370
1371 struct xfrm6_protocol {
1372 int (*handler)(struct sk_buff *skb);
1373 int (*cb_handler)(struct sk_buff *skb, int err);
1374 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1375 u8 type, u8 code, int offset, __be32 info);
1376
1377 struct xfrm6_protocol __rcu *next;
1378 int priority;
1379 };
1380
1381 /* XFRM tunnel handlers. */
1382 struct xfrm_tunnel {
1383 int (*handler)(struct sk_buff *skb);
1384 int (*err_handler)(struct sk_buff *skb, u32 info);
1385
1386 struct xfrm_tunnel __rcu *next;
1387 int priority;
1388 };
1389
1390 struct xfrm6_tunnel {
1391 int (*handler)(struct sk_buff *skb);
1392 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1393 u8 type, u8 code, int offset, __be32 info);
1394 struct xfrm6_tunnel __rcu *next;
1395 int priority;
1396 };
1397
1398 void xfrm_init(void);
1399 void xfrm4_init(void);
1400 int xfrm_state_init(struct net *net);
1401 void xfrm_state_fini(struct net *net);
1402 void xfrm4_state_init(void);
1403 void xfrm4_protocol_init(void);
1404 #ifdef CONFIG_XFRM
1405 int xfrm6_init(void);
1406 void xfrm6_fini(void);
1407 int xfrm6_state_init(void);
1408 void xfrm6_state_fini(void);
1409 int xfrm6_protocol_init(void);
1410 void xfrm6_protocol_fini(void);
1411 #else
1412 static inline int xfrm6_init(void)
1413 {
1414 return 0;
1415 }
1416 static inline void xfrm6_fini(void)
1417 {
1418 ;
1419 }
1420 #endif
1421
1422 #ifdef CONFIG_XFRM_STATISTICS
1423 int xfrm_proc_init(struct net *net);
1424 void xfrm_proc_fini(struct net *net);
1425 #endif
1426
1427 int xfrm_sysctl_init(struct net *net);
1428 #ifdef CONFIG_SYSCTL
1429 void xfrm_sysctl_fini(struct net *net);
1430 #else
1431 static inline void xfrm_sysctl_fini(struct net *net)
1432 {
1433 }
1434 #endif
1435
1436 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1437 struct xfrm_address_filter *filter);
1438 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1439 int (*func)(struct xfrm_state *, int, void*), void *);
1440 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1441 struct xfrm_state *xfrm_state_alloc(struct net *net);
1442 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1443 const xfrm_address_t *saddr,
1444 const struct flowi *fl,
1445 struct xfrm_tmpl *tmpl,
1446 struct xfrm_policy *pol, int *err,
1447 unsigned short family);
1448 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1449 xfrm_address_t *daddr,
1450 xfrm_address_t *saddr,
1451 unsigned short family,
1452 u8 mode, u8 proto, u32 reqid);
1453 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1454 unsigned short family);
1455 int xfrm_state_check_expire(struct xfrm_state *x);
1456 void xfrm_state_insert(struct xfrm_state *x);
1457 int xfrm_state_add(struct xfrm_state *x);
1458 int xfrm_state_update(struct xfrm_state *x);
1459 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1460 const xfrm_address_t *daddr, __be32 spi,
1461 u8 proto, unsigned short family);
1462 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1463 const xfrm_address_t *daddr,
1464 const xfrm_address_t *saddr,
1465 u8 proto,
1466 unsigned short family);
1467 #ifdef CONFIG_XFRM_SUB_POLICY
1468 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1469 unsigned short family, struct net *net);
1470 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1471 unsigned short family);
1472 #else
1473 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1474 int n, unsigned short family, struct net *net)
1475 {
1476 return -ENOSYS;
1477 }
1478
1479 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1480 int n, unsigned short family)
1481 {
1482 return -ENOSYS;
1483 }
1484 #endif
1485
1486 struct xfrmk_sadinfo {
1487 u32 sadhcnt; /* current hash bkts */
1488 u32 sadhmcnt; /* max allowed hash bkts */
1489 u32 sadcnt; /* current running count */
1490 };
1491
1492 struct xfrmk_spdinfo {
1493 u32 incnt;
1494 u32 outcnt;
1495 u32 fwdcnt;
1496 u32 inscnt;
1497 u32 outscnt;
1498 u32 fwdscnt;
1499 u32 spdhcnt;
1500 u32 spdhmcnt;
1501 };
1502
1503 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1504 int xfrm_state_delete(struct xfrm_state *x);
1505 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1506 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1507 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1508 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1509 int xfrm_init_replay(struct xfrm_state *x);
1510 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1511 int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1512 int xfrm_init_state(struct xfrm_state *x);
1513 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1514 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1515 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1516 int xfrm_output_resume(struct sk_buff *skb, int err);
1517 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1518 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1519 void xfrm_local_error(struct sk_buff *skb, int mtu);
1520 int xfrm4_extract_header(struct sk_buff *skb);
1521 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1522 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1523 int encap_type);
1524 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1525 int xfrm4_rcv(struct sk_buff *skb);
1526
1527 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1528 {
1529 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1530 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1531 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1532 return xfrm_input(skb, nexthdr, spi, 0);
1533 }
1534
1535 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1536 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1537 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1538 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1539 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1540 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1541 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1542 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1543 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1544 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1545 int xfrm6_extract_header(struct sk_buff *skb);
1546 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1547 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1548 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1549 int xfrm6_rcv(struct sk_buff *skb);
1550 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1551 xfrm_address_t *saddr, u8 proto);
1552 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1553 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1554 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1555 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1556 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1557 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1558 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1559 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1560 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1561 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1562 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1563 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1564 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1565 u8 **prevhdr);
1566
1567 #ifdef CONFIG_XFRM
1568 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1569 int xfrm_user_policy(struct sock *sk, int optname,
1570 u8 __user *optval, int optlen);
1571 #else
1572 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1573 {
1574 return -ENOPROTOOPT;
1575 }
1576
1577 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1578 {
1579 /* should not happen */
1580 kfree_skb(skb);
1581 return 0;
1582 }
1583 #endif
1584
1585 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1586
1587 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1588 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1589 int (*func)(struct xfrm_policy *, int, int, void*),
1590 void *);
1591 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1592 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1593 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1594 u8 type, int dir,
1595 struct xfrm_selector *sel,
1596 struct xfrm_sec_ctx *ctx, int delete,
1597 int *err);
1598 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1599 u32 id, int delete, int *err);
1600 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1601 void xfrm_policy_hash_rebuild(struct net *net);
1602 u32 xfrm_get_acqseq(void);
1603 int verify_spi_info(u8 proto, u32 min, u32 max);
1604 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1605 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1606 u8 mode, u32 reqid, u8 proto,
1607 const xfrm_address_t *daddr,
1608 const xfrm_address_t *saddr, int create,
1609 unsigned short family);
1610 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1611
1612 #ifdef CONFIG_XFRM_MIGRATE
1613 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1614 const struct xfrm_migrate *m, int num_bundles,
1615 const struct xfrm_kmaddress *k);
1616 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1617 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1618 struct xfrm_migrate *m);
1619 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1620 struct xfrm_migrate *m, int num_bundles,
1621 struct xfrm_kmaddress *k, struct net *net);
1622 #endif
1623
1624 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1625 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1626 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1627 xfrm_address_t *addr);
1628
1629 void xfrm_input_init(void);
1630 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1631
1632 void xfrm_probe_algs(void);
1633 int xfrm_count_pfkey_auth_supported(void);
1634 int xfrm_count_pfkey_enc_supported(void);
1635 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1636 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1637 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1638 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1639 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1640 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1641 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1642 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1643 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1644 int probe);
1645
1646 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1647 const xfrm_address_t *b)
1648 {
1649 return ipv6_addr_equal((const struct in6_addr *)a,
1650 (const struct in6_addr *)b);
1651 }
1652
1653 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1654 const xfrm_address_t *b,
1655 sa_family_t family)
1656 {
1657 switch (family) {
1658 default:
1659 case AF_INET:
1660 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1661 case AF_INET6:
1662 return xfrm6_addr_equal(a, b);
1663 }
1664 }
1665
1666 static inline int xfrm_policy_id2dir(u32 index)
1667 {
1668 return index & 7;
1669 }
1670
1671 #ifdef CONFIG_XFRM
1672 static inline int xfrm_aevent_is_on(struct net *net)
1673 {
1674 struct sock *nlsk;
1675 int ret = 0;
1676
1677 rcu_read_lock();
1678 nlsk = rcu_dereference(net->xfrm.nlsk);
1679 if (nlsk)
1680 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1681 rcu_read_unlock();
1682 return ret;
1683 }
1684
1685 static inline int xfrm_acquire_is_on(struct net *net)
1686 {
1687 struct sock *nlsk;
1688 int ret = 0;
1689
1690 rcu_read_lock();
1691 nlsk = rcu_dereference(net->xfrm.nlsk);
1692 if (nlsk)
1693 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1694 rcu_read_unlock();
1695
1696 return ret;
1697 }
1698 #endif
1699
1700 static inline int aead_len(struct xfrm_algo_aead *alg)
1701 {
1702 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1703 }
1704
1705 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1706 {
1707 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1708 }
1709
1710 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1711 {
1712 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1713 }
1714
1715 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1716 {
1717 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1718 }
1719
1720 #ifdef CONFIG_XFRM_MIGRATE
1721 static inline int xfrm_replay_clone(struct xfrm_state *x,
1722 struct xfrm_state *orig)
1723 {
1724 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1725 GFP_KERNEL);
1726 if (!x->replay_esn)
1727 return -ENOMEM;
1728
1729 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1730 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1731
1732 x->preplay_esn = kmemdup(x->replay_esn,
1733 xfrm_replay_state_esn_len(x->replay_esn),
1734 GFP_KERNEL);
1735 if (!x->preplay_esn) {
1736 kfree(x->replay_esn);
1737 return -ENOMEM;
1738 }
1739
1740 return 0;
1741 }
1742
1743 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1744 {
1745 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1746 }
1747
1748
1749 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1750 {
1751 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1752 }
1753
1754 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1755 {
1756 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1757 }
1758
1759 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1760 {
1761 int i;
1762 for (i = 0; i < n; i++)
1763 xfrm_state_put(*(states + i));
1764 }
1765
1766 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1767 {
1768 int i;
1769 for (i = 0; i < n; i++)
1770 xfrm_state_delete(*(states + i));
1771 }
1772 #endif
1773
1774 #ifdef CONFIG_XFRM
1775 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1776 {
1777 return skb->sp->xvec[skb->sp->len - 1];
1778 }
1779 #endif
1780
1781 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1782 {
1783 if (attrs[XFRMA_MARK])
1784 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1785 else
1786 m->v = m->m = 0;
1787
1788 return m->v & m->m;
1789 }
1790
1791 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1792 {
1793 int ret = 0;
1794
1795 if (m->m | m->v)
1796 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1797 return ret;
1798 }
1799
1800 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1801 unsigned int family)
1802 {
1803 bool tunnel = false;
1804
1805 switch(family) {
1806 case AF_INET:
1807 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1808 tunnel = true;
1809 break;
1810 case AF_INET6:
1811 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1812 tunnel = true;
1813 break;
1814 }
1815 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1816 return -EINVAL;
1817
1818 return 0;
1819 }
1820 #endif /* _NET_XFRM_H */
CRIS linux kernel tree