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Linux 4.1.18
[linux/fpc-iii.git] / include / net / xfrm.h
blob36ac102c97c72b1b5d62f99e28bf285fbad9f8bb
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
172 /* Data for encapsulator */
173 struct xfrm_encap_tmpl *encap;
174
175 /* Data for care-of address */
176 xfrm_address_t *coaddr;
177
178 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
179 struct xfrm_state *tunnel;
180
181 /* If a tunnel, number of users + 1 */
182 atomic_t tunnel_users;
183
184 /* State for replay detection */
185 struct xfrm_replay_state replay;
186 struct xfrm_replay_state_esn *replay_esn;
187
188 /* Replay detection state at the time we sent the last notification */
189 struct xfrm_replay_state preplay;
190 struct xfrm_replay_state_esn *preplay_esn;
191
192 /* The functions for replay detection. */
193 struct xfrm_replay *repl;
194
195 /* internal flag that only holds state for delayed aevent at the
196 * moment
197 */
198 u32 xflags;
199
200 /* Replay detection notification settings */
201 u32 replay_maxage;
202 u32 replay_maxdiff;
203
204 /* Replay detection notification timer */
205 struct timer_list rtimer;
206
207 /* Statistics */
208 struct xfrm_stats stats;
209
210 struct xfrm_lifetime_cur curlft;
211 struct tasklet_hrtimer mtimer;
212
213 /* used to fix curlft->add_time when changing date */
214 long saved_tmo;
215
216 /* Last used time */
217 unsigned long lastused;
218
219 /* Reference to data common to all the instances of this
220 * transformer. */
221 const struct xfrm_type *type;
222 struct xfrm_mode *inner_mode;
223 struct xfrm_mode *inner_mode_iaf;
224 struct xfrm_mode *outer_mode;
225
226 /* Security context */
227 struct xfrm_sec_ctx *security;
228
229 /* Private data of this transformer, format is opaque,
230 * interpreted by xfrm_type methods. */
231 void *data;
232 };
233
234 static inline struct net *xs_net(struct xfrm_state *x)
235 {
236 return read_pnet(&x->xs_net);
237 }
238
239 /* xflags - make enum if more show up */
240 #define XFRM_TIME_DEFER 1
241 #define XFRM_SOFT_EXPIRE 2
242
243 enum {
244 XFRM_STATE_VOID,
245 XFRM_STATE_ACQ,
246 XFRM_STATE_VALID,
247 XFRM_STATE_ERROR,
248 XFRM_STATE_EXPIRED,
249 XFRM_STATE_DEAD
250 };
251
252 /* callback structure passed from either netlink or pfkey */
253 struct km_event {
254 union {
255 u32 hard;
256 u32 proto;
257 u32 byid;
258 u32 aevent;
259 u32 type;
260 } data;
261
262 u32 seq;
263 u32 portid;
264 u32 event;
265 struct net *net;
266 };
267
268 struct xfrm_replay {
269 void (*advance)(struct xfrm_state *x, __be32 net_seq);
270 int (*check)(struct xfrm_state *x,
271 struct sk_buff *skb,
272 __be32 net_seq);
273 int (*recheck)(struct xfrm_state *x,
274 struct sk_buff *skb,
275 __be32 net_seq);
276 void (*notify)(struct xfrm_state *x, int event);
277 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
278 };
279
280 struct net_device;
281 struct xfrm_type;
282 struct xfrm_dst;
283 struct xfrm_policy_afinfo {
284 unsigned short family;
285 struct dst_ops *dst_ops;
286 void (*garbage_collect)(struct net *net);
287 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
288 const xfrm_address_t *saddr,
289 const xfrm_address_t *daddr);
290 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
291 void (*decode_session)(struct sk_buff *skb,
292 struct flowi *fl,
293 int reverse);
294 int (*get_tos)(const struct flowi *fl);
295 void (*init_dst)(struct net *net,
296 struct xfrm_dst *dst);
297 int (*init_path)(struct xfrm_dst *path,
298 struct dst_entry *dst,
299 int nfheader_len);
300 int (*fill_dst)(struct xfrm_dst *xdst,
301 struct net_device *dev,
302 const struct flowi *fl);
303 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
304 };
305
306 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
307 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
308 void km_policy_notify(struct xfrm_policy *xp, int dir,
309 const struct km_event *c);
310 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
311
312 struct xfrm_tmpl;
313 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
314 struct xfrm_policy *pol);
315 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
316 int __xfrm_state_delete(struct xfrm_state *x);
317
318 struct xfrm_state_afinfo {
319 unsigned int family;
320 unsigned int proto;
321 __be16 eth_proto;
322 struct module *owner;
323 const struct xfrm_type *type_map[IPPROTO_MAX];
324 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
325 int (*init_flags)(struct xfrm_state *x);
326 void (*init_tempsel)(struct xfrm_selector *sel,
327 const struct flowi *fl);
328 void (*init_temprop)(struct xfrm_state *x,
329 const struct xfrm_tmpl *tmpl,
330 const xfrm_address_t *daddr,
331 const xfrm_address_t *saddr);
332 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
333 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
334 int (*output)(struct sock *sk, struct sk_buff *skb);
335 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
336 int (*extract_input)(struct xfrm_state *x,
337 struct sk_buff *skb);
338 int (*extract_output)(struct xfrm_state *x,
339 struct sk_buff *skb);
340 int (*transport_finish)(struct sk_buff *skb,
341 int async);
342 void (*local_error)(struct sk_buff *skb, u32 mtu);
343 };
344
345 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
346 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
347 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
348 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
349
350 struct xfrm_input_afinfo {
351 unsigned int family;
352 struct module *owner;
353 int (*callback)(struct sk_buff *skb, u8 protocol,
354 int err);
355 };
356
357 int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
358 int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
359
360 void xfrm_state_delete_tunnel(struct xfrm_state *x);
361
362 struct xfrm_type {
363 char *description;
364 struct module *owner;
365 u8 proto;
366 u8 flags;
367 #define XFRM_TYPE_NON_FRAGMENT 1
368 #define XFRM_TYPE_REPLAY_PROT 2
369 #define XFRM_TYPE_LOCAL_COADDR 4
370 #define XFRM_TYPE_REMOTE_COADDR 8
371
372 int (*init_state)(struct xfrm_state *x);
373 void (*destructor)(struct xfrm_state *);
374 int (*input)(struct xfrm_state *, struct sk_buff *skb);
375 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
376 int (*reject)(struct xfrm_state *, struct sk_buff *,
377 const struct flowi *);
378 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
379 /* Estimate maximal size of result of transformation of a dgram */
380 u32 (*get_mtu)(struct xfrm_state *, int size);
381 };
382
383 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
384 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
385
386 struct xfrm_mode {
387 /*
388 * Remove encapsulation header.
389 *
390 * The IP header will be moved over the top of the encapsulation
391 * header.
392 *
393 * On entry, the transport header shall point to where the IP header
394 * should be and the network header shall be set to where the IP
395 * header currently is. skb->data shall point to the start of the
396 * payload.
397 */
398 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
399
400 /*
401 * This is the actual input entry point.
402 *
403 * For transport mode and equivalent this would be identical to
404 * input2 (which does not need to be set). While tunnel mode
405 * and equivalent would set this to the tunnel encapsulation function
406 * xfrm4_prepare_input that would in turn call input2.
407 */
408 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
409
410 /*
411 * Add encapsulation header.
412 *
413 * On exit, the transport header will be set to the start of the
414 * encapsulation header to be filled in by x->type->output and
415 * the mac header will be set to the nextheader (protocol for
416 * IPv4) field of the extension header directly preceding the
417 * encapsulation header, or in its absence, that of the top IP
418 * header. The value of the network header will always point
419 * to the top IP header while skb->data will point to the payload.
420 */
421 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
422
423 /*
424 * This is the actual output entry point.
425 *
426 * For transport mode and equivalent this would be identical to
427 * output2 (which does not need to be set). While tunnel mode
428 * and equivalent would set this to a tunnel encapsulation function
429 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
430 * call output2.
431 */
432 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
433
434 struct xfrm_state_afinfo *afinfo;
435 struct module *owner;
436 unsigned int encap;
437 int flags;
438 };
439
440 /* Flags for xfrm_mode. */
441 enum {
442 XFRM_MODE_FLAG_TUNNEL = 1,
443 };
444
445 int xfrm_register_mode(struct xfrm_mode *mode, int family);
446 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
447
448 static inline int xfrm_af2proto(unsigned int family)
449 {
450 switch(family) {
451 case AF_INET:
452 return IPPROTO_IPIP;
453 case AF_INET6:
454 return IPPROTO_IPV6;
455 default:
456 return 0;
457 }
458 }
459
460 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
461 {
462 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
463 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
464 return x->inner_mode;
465 else
466 return x->inner_mode_iaf;
467 }
468
469 struct xfrm_tmpl {
470 /* id in template is interpreted as:
471 * daddr - destination of tunnel, may be zero for transport mode.
472 * spi - zero to acquire spi. Not zero if spi is static, then
473 * daddr must be fixed too.
474 * proto - AH/ESP/IPCOMP
475 */
476 struct xfrm_id id;
477
478 /* Source address of tunnel. Ignored, if it is not a tunnel. */
479 xfrm_address_t saddr;
480
481 unsigned short encap_family;
482
483 u32 reqid;
484
485 /* Mode: transport, tunnel etc. */
486 u8 mode;
487
488 /* Sharing mode: unique, this session only, this user only etc. */
489 u8 share;
490
491 /* May skip this transfomration if no SA is found */
492 u8 optional;
493
494 /* Skip aalgos/ealgos/calgos checks. */
495 u8 allalgs;
496
497 /* Bit mask of algos allowed for acquisition */
498 u32 aalgos;
499 u32 ealgos;
500 u32 calgos;
501 };
502
503 #define XFRM_MAX_DEPTH 6
504
505 struct xfrm_policy_walk_entry {
506 struct list_head all;
507 u8 dead;
508 };
509
510 struct xfrm_policy_walk {
511 struct xfrm_policy_walk_entry walk;
512 u8 type;
513 u32 seq;
514 };
515
516 struct xfrm_policy_queue {
517 struct sk_buff_head hold_queue;
518 struct timer_list hold_timer;
519 unsigned long timeout;
520 };
521
522 struct xfrm_policy {
523 possible_net_t xp_net;
524 struct hlist_node bydst;
525 struct hlist_node byidx;
526
527 /* This lock only affects elements except for entry. */
528 rwlock_t lock;
529 atomic_t refcnt;
530 struct timer_list timer;
531
532 struct flow_cache_object flo;
533 atomic_t genid;
534 u32 priority;
535 u32 index;
536 struct xfrm_mark mark;
537 struct xfrm_selector selector;
538 struct xfrm_lifetime_cfg lft;
539 struct xfrm_lifetime_cur curlft;
540 struct xfrm_policy_walk_entry walk;
541 struct xfrm_policy_queue polq;
542 u8 type;
543 u8 action;
544 u8 flags;
545 u8 xfrm_nr;
546 u16 family;
547 struct xfrm_sec_ctx *security;
548 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
549 };
550
551 static inline struct net *xp_net(const struct xfrm_policy *xp)
552 {
553 return read_pnet(&xp->xp_net);
554 }
555
556 struct xfrm_kmaddress {
557 xfrm_address_t local;
558 xfrm_address_t remote;
559 u32 reserved;
560 u16 family;
561 };
562
563 struct xfrm_migrate {
564 xfrm_address_t old_daddr;
565 xfrm_address_t old_saddr;
566 xfrm_address_t new_daddr;
567 xfrm_address_t new_saddr;
568 u8 proto;
569 u8 mode;
570 u16 reserved;
571 u32 reqid;
572 u16 old_family;
573 u16 new_family;
574 };
575
576 #define XFRM_KM_TIMEOUT 30
577 /* what happened */
578 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
579 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
580
581 /* default aevent timeout in units of 100ms */
582 #define XFRM_AE_ETIME 10
583 /* Async Event timer multiplier */
584 #define XFRM_AE_ETH_M 10
585 /* default seq threshold size */
586 #define XFRM_AE_SEQT_SIZE 2
587
588 struct xfrm_mgr {
589 struct list_head list;
590 char *id;
591 int (*notify)(struct xfrm_state *x, const struct km_event *c);
592 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
593 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
594 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
595 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
596 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
597 int (*migrate)(const struct xfrm_selector *sel,
598 u8 dir, u8 type,
599 const struct xfrm_migrate *m,
600 int num_bundles,
601 const struct xfrm_kmaddress *k);
602 bool (*is_alive)(const struct km_event *c);
603 };
604
605 int xfrm_register_km(struct xfrm_mgr *km);
606 int xfrm_unregister_km(struct xfrm_mgr *km);
607
608 struct xfrm_tunnel_skb_cb {
609 union {
610 struct inet_skb_parm h4;
611 struct inet6_skb_parm h6;
612 } header;
613
614 union {
615 struct ip_tunnel *ip4;
616 struct ip6_tnl *ip6;
617 } tunnel;
618 };
619
620 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
621
622 /*
623 * This structure is used for the duration where packets are being
624 * transformed by IPsec. As soon as the packet leaves IPsec the
625 * area beyond the generic IP part may be overwritten.
626 */
627 struct xfrm_skb_cb {
628 struct xfrm_tunnel_skb_cb header;
629
630 /* Sequence number for replay protection. */
631 union {
632 struct {
633 __u32 low;
634 __u32 hi;
635 } output;
636 struct {
637 __be32 low;
638 __be32 hi;
639 } input;
640 } seq;
641 };
642
643 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
644
645 /*
646 * This structure is used by the afinfo prepare_input/prepare_output functions
647 * to transmit header information to the mode input/output functions.
648 */
649 struct xfrm_mode_skb_cb {
650 struct xfrm_tunnel_skb_cb header;
651
652 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
653 __be16 id;
654 __be16 frag_off;
655
656 /* IP header length (excluding options or extension headers). */
657 u8 ihl;
658
659 /* TOS for IPv4, class for IPv6. */
660 u8 tos;
661
662 /* TTL for IPv4, hop limitfor IPv6. */
663 u8 ttl;
664
665 /* Protocol for IPv4, NH for IPv6. */
666 u8 protocol;
667
668 /* Option length for IPv4, zero for IPv6. */
669 u8 optlen;
670
671 /* Used by IPv6 only, zero for IPv4. */
672 u8 flow_lbl[3];
673 };
674
675 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
676
677 /*
678 * This structure is used by the input processing to locate the SPI and
679 * related information.
680 */
681 struct xfrm_spi_skb_cb {
682 struct xfrm_tunnel_skb_cb header;
683
684 unsigned int daddroff;
685 unsigned int family;
686 };
687
688 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
689
690 #ifdef CONFIG_AUDITSYSCALL
691 static inline struct audit_buffer *xfrm_audit_start(const char *op)
692 {
693 struct audit_buffer *audit_buf = NULL;
694
695 if (audit_enabled == 0)
696 return NULL;
697 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
698 AUDIT_MAC_IPSEC_EVENT);
699 if (audit_buf == NULL)
700 return NULL;
701 audit_log_format(audit_buf, "op=%s", op);
702 return audit_buf;
703 }
704
705 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
706 struct audit_buffer *audit_buf)
707 {
708 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
709 audit_get_loginuid(current) :
710 INVALID_UID);
711 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
712 (unsigned int) -1;
713
714 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
715 audit_log_task_context(audit_buf);
716 }
717
718 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
719 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
720 bool task_valid);
721 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
722 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
723 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
724 struct sk_buff *skb);
725 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
726 __be32 net_seq);
727 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
728 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
729 __be32 net_seq);
730 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
731 u8 proto);
732 #else
733
734 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
735 bool task_valid)
736 {
737 }
738
739 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
740 bool task_valid)
741 {
742 }
743
744 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
745 bool task_valid)
746 {
747 }
748
749 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
750 bool task_valid)
751 {
752 }
753
754 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
755 struct sk_buff *skb)
756 {
757 }
758
759 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
760 struct sk_buff *skb, __be32 net_seq)
761 {
762 }
763
764 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
765 u16 family)
766 {
767 }
768
769 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
770 __be32 net_spi, __be32 net_seq)
771 {
772 }
773
774 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
775 struct sk_buff *skb, u8 proto)
776 {
777 }
778 #endif /* CONFIG_AUDITSYSCALL */
779
780 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
781 {
782 if (likely(policy != NULL))
783 atomic_inc(&policy->refcnt);
784 }
785
786 void xfrm_policy_destroy(struct xfrm_policy *policy);
787
788 static inline void xfrm_pol_put(struct xfrm_policy *policy)
789 {
790 if (atomic_dec_and_test(&policy->refcnt))
791 xfrm_policy_destroy(policy);
792 }
793
794 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
795 {
796 int i;
797 for (i = npols - 1; i >= 0; --i)
798 xfrm_pol_put(pols[i]);
799 }
800
801 void __xfrm_state_destroy(struct xfrm_state *);
802
803 static inline void __xfrm_state_put(struct xfrm_state *x)
804 {
805 atomic_dec(&x->refcnt);
806 }
807
808 static inline void xfrm_state_put(struct xfrm_state *x)
809 {
810 if (atomic_dec_and_test(&x->refcnt))
811 __xfrm_state_destroy(x);
812 }
813
814 static inline void xfrm_state_hold(struct xfrm_state *x)
815 {
816 atomic_inc(&x->refcnt);
817 }
818
819 static inline bool addr_match(const void *token1, const void *token2,
820 int prefixlen)
821 {
822 const __be32 *a1 = token1;
823 const __be32 *a2 = token2;
824 int pdw;
825 int pbi;
826
827 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
828 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
829
830 if (pdw)
831 if (memcmp(a1, a2, pdw << 2))
832 return false;
833
834 if (pbi) {
835 __be32 mask;
836
837 mask = htonl((0xffffffff) << (32 - pbi));
838
839 if ((a1[pdw] ^ a2[pdw]) & mask)
840 return false;
841 }
842
843 return true;
844 }
845
846 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
847 {
848 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
849 if (prefixlen == 0)
850 return true;
851 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
852 }
853
854 static __inline__
855 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
856 {
857 __be16 port;
858 switch(fl->flowi_proto) {
859 case IPPROTO_TCP:
860 case IPPROTO_UDP:
861 case IPPROTO_UDPLITE:
862 case IPPROTO_SCTP:
863 port = uli->ports.sport;
864 break;
865 case IPPROTO_ICMP:
866 case IPPROTO_ICMPV6:
867 port = htons(uli->icmpt.type);
868 break;
869 case IPPROTO_MH:
870 port = htons(uli->mht.type);
871 break;
872 case IPPROTO_GRE:
873 port = htons(ntohl(uli->gre_key) >> 16);
874 break;
875 default:
876 port = 0; /*XXX*/
877 }
878 return port;
879 }
880
881 static __inline__
882 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
883 {
884 __be16 port;
885 switch(fl->flowi_proto) {
886 case IPPROTO_TCP:
887 case IPPROTO_UDP:
888 case IPPROTO_UDPLITE:
889 case IPPROTO_SCTP:
890 port = uli->ports.dport;
891 break;
892 case IPPROTO_ICMP:
893 case IPPROTO_ICMPV6:
894 port = htons(uli->icmpt.code);
895 break;
896 case IPPROTO_GRE:
897 port = htons(ntohl(uli->gre_key) & 0xffff);
898 break;
899 default:
900 port = 0; /*XXX*/
901 }
902 return port;
903 }
904
905 bool xfrm_selector_match(const struct xfrm_selector *sel,
906 const struct flowi *fl, unsigned short family);
907
908 #ifdef CONFIG_SECURITY_NETWORK_XFRM
909 /* If neither has a context --> match
910 * Otherwise, both must have a context and the sids, doi, alg must match
911 */
912 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
913 {
914 return ((!s1 && !s2) ||
915 (s1 && s2 &&
916 (s1->ctx_sid == s2->ctx_sid) &&
917 (s1->ctx_doi == s2->ctx_doi) &&
918 (s1->ctx_alg == s2->ctx_alg)));
919 }
920 #else
921 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
922 {
923 return true;
924 }
925 #endif
926
927 /* A struct encoding bundle of transformations to apply to some set of flow.
928 *
929 * dst->child points to the next element of bundle.
930 * dst->xfrm points to an instanse of transformer.
931 *
932 * Due to unfortunate limitations of current routing cache, which we
933 * have no time to fix, it mirrors struct rtable and bound to the same
934 * routing key, including saddr,daddr. However, we can have many of
935 * bundles differing by session id. All the bundles grow from a parent
936 * policy rule.
937 */
938 struct xfrm_dst {
939 union {
940 struct dst_entry dst;
941 struct rtable rt;
942 struct rt6_info rt6;
943 } u;
944 struct dst_entry *route;
945 struct flow_cache_object flo;
946 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
947 int num_pols, num_xfrms;
948 #ifdef CONFIG_XFRM_SUB_POLICY
949 struct flowi *origin;
950 struct xfrm_selector *partner;
951 #endif
952 u32 xfrm_genid;
953 u32 policy_genid;
954 u32 route_mtu_cached;
955 u32 child_mtu_cached;
956 u32 route_cookie;
957 u32 path_cookie;
958 };
959
960 #ifdef CONFIG_XFRM
961 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
962 {
963 xfrm_pols_put(xdst->pols, xdst->num_pols);
964 dst_release(xdst->route);
965 if (likely(xdst->u.dst.xfrm))
966 xfrm_state_put(xdst->u.dst.xfrm);
967 #ifdef CONFIG_XFRM_SUB_POLICY
968 kfree(xdst->origin);
969 xdst->origin = NULL;
970 kfree(xdst->partner);
971 xdst->partner = NULL;
972 #endif
973 }
974 #endif
975
976 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
977
978 struct sec_path {
979 atomic_t refcnt;
980 int len;
981 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
982 };
983
984 static inline int secpath_exists(struct sk_buff *skb)
985 {
986 #ifdef CONFIG_XFRM
987 return skb->sp != NULL;
988 #else
989 return 0;
990 #endif
991 }
992
993 static inline struct sec_path *
994 secpath_get(struct sec_path *sp)
995 {
996 if (sp)
997 atomic_inc(&sp->refcnt);
998 return sp;
999 }
1000
1001 void __secpath_destroy(struct sec_path *sp);
1002
1003 static inline void
1004 secpath_put(struct sec_path *sp)
1005 {
1006 if (sp && atomic_dec_and_test(&sp->refcnt))
1007 __secpath_destroy(sp);
1008 }
1009
1010 struct sec_path *secpath_dup(struct sec_path *src);
1011
1012 static inline void
1013 secpath_reset(struct sk_buff *skb)
1014 {
1015 #ifdef CONFIG_XFRM
1016 secpath_put(skb->sp);
1017 skb->sp = NULL;
1018 #endif
1019 }
1020
1021 static inline int
1022 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1023 {
1024 switch (family) {
1025 case AF_INET:
1026 return addr->a4 == 0;
1027 case AF_INET6:
1028 return ipv6_addr_any(&addr->in6);
1029 }
1030 return 0;
1031 }
1032
1033 static inline int
1034 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1035 {
1036 return (tmpl->saddr.a4 &&
1037 tmpl->saddr.a4 != x->props.saddr.a4);
1038 }
1039
1040 static inline int
1041 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1042 {
1043 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1044 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1045 }
1046
1047 static inline int
1048 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1049 {
1050 switch (family) {
1051 case AF_INET:
1052 return __xfrm4_state_addr_cmp(tmpl, x);
1053 case AF_INET6:
1054 return __xfrm6_state_addr_cmp(tmpl, x);
1055 }
1056 return !0;
1057 }
1058
1059 #ifdef CONFIG_XFRM
1060 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1061 unsigned short family);
1062
1063 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1064 struct sk_buff *skb,
1065 unsigned int family, int reverse)
1066 {
1067 struct net *net = dev_net(skb->dev);
1068 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1069
1070 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1071 return __xfrm_policy_check(sk, ndir, skb, family);
1072
1073 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1074 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1075 __xfrm_policy_check(sk, ndir, skb, family);
1076 }
1077
1078 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1079 {
1080 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1081 }
1082
1083 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1084 {
1085 return xfrm_policy_check(sk, dir, skb, AF_INET);
1086 }
1087
1088 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1089 {
1090 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1091 }
1092
1093 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1094 struct sk_buff *skb)
1095 {
1096 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1097 }
1098
1099 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1100 struct sk_buff *skb)
1101 {
1102 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1103 }
1104
1105 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1106 unsigned int family, int reverse);
1107
1108 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1109 unsigned int family)
1110 {
1111 return __xfrm_decode_session(skb, fl, family, 0);
1112 }
1113
1114 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1115 struct flowi *fl,
1116 unsigned int family)
1117 {
1118 return __xfrm_decode_session(skb, fl, family, 1);
1119 }
1120
1121 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1122
1123 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1124 {
1125 struct net *net = dev_net(skb->dev);
1126
1127 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1128 (skb_dst(skb)->flags & DST_NOXFRM) ||
1129 __xfrm_route_forward(skb, family);
1130 }
1131
1132 static inline int xfrm4_route_forward(struct sk_buff *skb)
1133 {
1134 return xfrm_route_forward(skb, AF_INET);
1135 }
1136
1137 static inline int xfrm6_route_forward(struct sk_buff *skb)
1138 {
1139 return xfrm_route_forward(skb, AF_INET6);
1140 }
1141
1142 int __xfrm_sk_clone_policy(struct sock *sk);
1143
1144 static inline int xfrm_sk_clone_policy(struct sock *sk)
1145 {
1146 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1147 return __xfrm_sk_clone_policy(sk);
1148 return 0;
1149 }
1150
1151 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1152
1153 static inline void xfrm_sk_free_policy(struct sock *sk)
1154 {
1155 if (unlikely(sk->sk_policy[0] != NULL)) {
1156 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1157 sk->sk_policy[0] = NULL;
1158 }
1159 if (unlikely(sk->sk_policy[1] != NULL)) {
1160 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1161 sk->sk_policy[1] = NULL;
1162 }
1163 }
1164
1165 void xfrm_garbage_collect(struct net *net);
1166
1167 #else
1168
1169 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1170 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1171 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1172 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1173 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1174 {
1175 return 1;
1176 }
1177 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1178 {
1179 return 1;
1180 }
1181 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1182 {
1183 return 1;
1184 }
1185 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1186 struct flowi *fl,
1187 unsigned int family)
1188 {
1189 return -ENOSYS;
1190 }
1191 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1192 struct sk_buff *skb)
1193 {
1194 return 1;
1195 }
1196 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1197 struct sk_buff *skb)
1198 {
1199 return 1;
1200 }
1201 static inline void xfrm_garbage_collect(struct net *net)
1202 {
1203 }
1204 #endif
1205
1206 static __inline__
1207 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1208 {
1209 switch (family){
1210 case AF_INET:
1211 return (xfrm_address_t *)&fl->u.ip4.daddr;
1212 case AF_INET6:
1213 return (xfrm_address_t *)&fl->u.ip6.daddr;
1214 }
1215 return NULL;
1216 }
1217
1218 static __inline__
1219 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1220 {
1221 switch (family){
1222 case AF_INET:
1223 return (xfrm_address_t *)&fl->u.ip4.saddr;
1224 case AF_INET6:
1225 return (xfrm_address_t *)&fl->u.ip6.saddr;
1226 }
1227 return NULL;
1228 }
1229
1230 static __inline__
1231 void xfrm_flowi_addr_get(const struct flowi *fl,
1232 xfrm_address_t *saddr, xfrm_address_t *daddr,
1233 unsigned short family)
1234 {
1235 switch(family) {
1236 case AF_INET:
1237 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1238 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1239 break;
1240 case AF_INET6:
1241 saddr->in6 = fl->u.ip6.saddr;
1242 daddr->in6 = fl->u.ip6.daddr;
1243 break;
1244 }
1245 }
1246
1247 static __inline__ int
1248 __xfrm4_state_addr_check(const struct xfrm_state *x,
1249 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1250 {
1251 if (daddr->a4 == x->id.daddr.a4 &&
1252 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1253 return 1;
1254 return 0;
1255 }
1256
1257 static __inline__ int
1258 __xfrm6_state_addr_check(const struct xfrm_state *x,
1259 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1260 {
1261 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1262 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1263 ipv6_addr_any((struct in6_addr *)saddr) ||
1264 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1265 return 1;
1266 return 0;
1267 }
1268
1269 static __inline__ int
1270 xfrm_state_addr_check(const struct xfrm_state *x,
1271 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1272 unsigned short family)
1273 {
1274 switch (family) {
1275 case AF_INET:
1276 return __xfrm4_state_addr_check(x, daddr, saddr);
1277 case AF_INET6:
1278 return __xfrm6_state_addr_check(x, daddr, saddr);
1279 }
1280 return 0;
1281 }
1282
1283 static __inline__ int
1284 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1285 unsigned short family)
1286 {
1287 switch (family) {
1288 case AF_INET:
1289 return __xfrm4_state_addr_check(x,
1290 (const xfrm_address_t *)&fl->u.ip4.daddr,
1291 (const xfrm_address_t *)&fl->u.ip4.saddr);
1292 case AF_INET6:
1293 return __xfrm6_state_addr_check(x,
1294 (const xfrm_address_t *)&fl->u.ip6.daddr,
1295 (const xfrm_address_t *)&fl->u.ip6.saddr);
1296 }
1297 return 0;
1298 }
1299
1300 static inline int xfrm_state_kern(const struct xfrm_state *x)
1301 {
1302 return atomic_read(&x->tunnel_users);
1303 }
1304
1305 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1306 {
1307 return (!userproto || proto == userproto ||
1308 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1309 proto == IPPROTO_ESP ||
1310 proto == IPPROTO_COMP)));
1311 }
1312
1313 /*
1314 * xfrm algorithm information
1315 */
1316 struct xfrm_algo_aead_info {
1317 u16 icv_truncbits;
1318 };
1319
1320 struct xfrm_algo_auth_info {
1321 u16 icv_truncbits;
1322 u16 icv_fullbits;
1323 };
1324
1325 struct xfrm_algo_encr_info {
1326 u16 blockbits;
1327 u16 defkeybits;
1328 };
1329
1330 struct xfrm_algo_comp_info {
1331 u16 threshold;
1332 };
1333
1334 struct xfrm_algo_desc {
1335 char *name;
1336 char *compat;
1337 u8 available:1;
1338 u8 pfkey_supported:1;
1339 union {
1340 struct xfrm_algo_aead_info aead;
1341 struct xfrm_algo_auth_info auth;
1342 struct xfrm_algo_encr_info encr;
1343 struct xfrm_algo_comp_info comp;
1344 } uinfo;
1345 struct sadb_alg desc;
1346 };
1347
1348 /* XFRM protocol handlers. */
1349 struct xfrm4_protocol {
1350 int (*handler)(struct sk_buff *skb);
1351 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1352 int encap_type);
1353 int (*cb_handler)(struct sk_buff *skb, int err);
1354 int (*err_handler)(struct sk_buff *skb, u32 info);
1355
1356 struct xfrm4_protocol __rcu *next;
1357 int priority;
1358 };
1359
1360 struct xfrm6_protocol {
1361 int (*handler)(struct sk_buff *skb);
1362 int (*cb_handler)(struct sk_buff *skb, int err);
1363 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1364 u8 type, u8 code, int offset, __be32 info);
1365
1366 struct xfrm6_protocol __rcu *next;
1367 int priority;
1368 };
1369
1370 /* XFRM tunnel handlers. */
1371 struct xfrm_tunnel {
1372 int (*handler)(struct sk_buff *skb);
1373 int (*err_handler)(struct sk_buff *skb, u32 info);
1374
1375 struct xfrm_tunnel __rcu *next;
1376 int priority;
1377 };
1378
1379 struct xfrm6_tunnel {
1380 int (*handler)(struct sk_buff *skb);
1381 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1382 u8 type, u8 code, int offset, __be32 info);
1383 struct xfrm6_tunnel __rcu *next;
1384 int priority;
1385 };
1386
1387 void xfrm_init(void);
1388 void xfrm4_init(void);
1389 int xfrm_state_init(struct net *net);
1390 void xfrm_state_fini(struct net *net);
1391 void xfrm4_state_init(void);
1392 void xfrm4_protocol_init(void);
1393 #ifdef CONFIG_XFRM
1394 int xfrm6_init(void);
1395 void xfrm6_fini(void);
1396 int xfrm6_state_init(void);
1397 void xfrm6_state_fini(void);
1398 int xfrm6_protocol_init(void);
1399 void xfrm6_protocol_fini(void);
1400 #else
1401 static inline int xfrm6_init(void)
1402 {
1403 return 0;
1404 }
1405 static inline void xfrm6_fini(void)
1406 {
1407 ;
1408 }
1409 #endif
1410
1411 #ifdef CONFIG_XFRM_STATISTICS
1412 int xfrm_proc_init(struct net *net);
1413 void xfrm_proc_fini(struct net *net);
1414 #endif
1415
1416 int xfrm_sysctl_init(struct net *net);
1417 #ifdef CONFIG_SYSCTL
1418 void xfrm_sysctl_fini(struct net *net);
1419 #else
1420 static inline void xfrm_sysctl_fini(struct net *net)
1421 {
1422 }
1423 #endif
1424
1425 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1426 struct xfrm_address_filter *filter);
1427 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1428 int (*func)(struct xfrm_state *, int, void*), void *);
1429 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1430 struct xfrm_state *xfrm_state_alloc(struct net *net);
1431 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1432 const xfrm_address_t *saddr,
1433 const struct flowi *fl,
1434 struct xfrm_tmpl *tmpl,
1435 struct xfrm_policy *pol, int *err,
1436 unsigned short family);
1437 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1438 xfrm_address_t *daddr,
1439 xfrm_address_t *saddr,
1440 unsigned short family,
1441 u8 mode, u8 proto, u32 reqid);
1442 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1443 unsigned short family);
1444 int xfrm_state_check_expire(struct xfrm_state *x);
1445 void xfrm_state_insert(struct xfrm_state *x);
1446 int xfrm_state_add(struct xfrm_state *x);
1447 int xfrm_state_update(struct xfrm_state *x);
1448 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1449 const xfrm_address_t *daddr, __be32 spi,
1450 u8 proto, unsigned short family);
1451 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1452 const xfrm_address_t *daddr,
1453 const xfrm_address_t *saddr,
1454 u8 proto,
1455 unsigned short family);
1456 #ifdef CONFIG_XFRM_SUB_POLICY
1457 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1458 unsigned short family, struct net *net);
1459 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1460 unsigned short family);
1461 #else
1462 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1463 int n, unsigned short family, struct net *net)
1464 {
1465 return -ENOSYS;
1466 }
1467
1468 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1469 int n, unsigned short family)
1470 {
1471 return -ENOSYS;
1472 }
1473 #endif
1474
1475 struct xfrmk_sadinfo {
1476 u32 sadhcnt; /* current hash bkts */
1477 u32 sadhmcnt; /* max allowed hash bkts */
1478 u32 sadcnt; /* current running count */
1479 };
1480
1481 struct xfrmk_spdinfo {
1482 u32 incnt;
1483 u32 outcnt;
1484 u32 fwdcnt;
1485 u32 inscnt;
1486 u32 outscnt;
1487 u32 fwdscnt;
1488 u32 spdhcnt;
1489 u32 spdhmcnt;
1490 };
1491
1492 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1493 int xfrm_state_delete(struct xfrm_state *x);
1494 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1495 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1496 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1497 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1498 int xfrm_init_replay(struct xfrm_state *x);
1499 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1500 int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1501 int xfrm_init_state(struct xfrm_state *x);
1502 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1503 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1504 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1505 int xfrm_output_resume(struct sk_buff *skb, int err);
1506 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1507 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1508 void xfrm_local_error(struct sk_buff *skb, int mtu);
1509 int xfrm4_extract_header(struct sk_buff *skb);
1510 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1511 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1512 int encap_type);
1513 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1514 int xfrm4_rcv(struct sk_buff *skb);
1515
1516 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1517 {
1518 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1519 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1520 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1521 return xfrm_input(skb, nexthdr, spi, 0);
1522 }
1523
1524 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1525 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1526 int xfrm4_output(struct sock *sk, struct sk_buff *skb);
1527 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1528 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1529 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1530 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1531 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1532 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1533 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1534 int xfrm6_extract_header(struct sk_buff *skb);
1535 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1536 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1537 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1538 int xfrm6_rcv(struct sk_buff *skb);
1539 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1540 xfrm_address_t *saddr, u8 proto);
1541 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1542 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1543 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1544 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1545 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1546 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1547 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1548 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1549 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1550 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1551 int xfrm6_output(struct sock *sk, struct sk_buff *skb);
1552 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1553 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1554 u8 **prevhdr);
1555
1556 #ifdef CONFIG_XFRM
1557 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1558 int xfrm_user_policy(struct sock *sk, int optname,
1559 u8 __user *optval, int optlen);
1560 #else
1561 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1562 {
1563 return -ENOPROTOOPT;
1564 }
1565
1566 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1567 {
1568 /* should not happen */
1569 kfree_skb(skb);
1570 return 0;
1571 }
1572 #endif
1573
1574 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1575
1576 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1577 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1578 int (*func)(struct xfrm_policy *, int, int, void*),
1579 void *);
1580 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1581 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1582 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1583 u8 type, int dir,
1584 struct xfrm_selector *sel,
1585 struct xfrm_sec_ctx *ctx, int delete,
1586 int *err);
1587 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1588 u32 id, int delete, int *err);
1589 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1590 void xfrm_policy_hash_rebuild(struct net *net);
1591 u32 xfrm_get_acqseq(void);
1592 int verify_spi_info(u8 proto, u32 min, u32 max);
1593 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1594 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1595 u8 mode, u32 reqid, u8 proto,
1596 const xfrm_address_t *daddr,
1597 const xfrm_address_t *saddr, int create,
1598 unsigned short family);
1599 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1600
1601 #ifdef CONFIG_XFRM_MIGRATE
1602 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1603 const struct xfrm_migrate *m, int num_bundles,
1604 const struct xfrm_kmaddress *k);
1605 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1606 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1607 struct xfrm_migrate *m);
1608 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1609 struct xfrm_migrate *m, int num_bundles,
1610 struct xfrm_kmaddress *k, struct net *net);
1611 #endif
1612
1613 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1614 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1615 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1616 xfrm_address_t *addr);
1617
1618 void xfrm_input_init(void);
1619 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1620
1621 void xfrm_probe_algs(void);
1622 int xfrm_count_pfkey_auth_supported(void);
1623 int xfrm_count_pfkey_enc_supported(void);
1624 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1625 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1626 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1627 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1628 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1629 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1630 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1631 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1632 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1633 int probe);
1634
1635 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1636 const xfrm_address_t *b)
1637 {
1638 return ipv6_addr_equal((const struct in6_addr *)a,
1639 (const struct in6_addr *)b);
1640 }
1641
1642 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1643 const xfrm_address_t *b,
1644 sa_family_t family)
1645 {
1646 switch (family) {
1647 default:
1648 case AF_INET:
1649 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1650 case AF_INET6:
1651 return xfrm6_addr_equal(a, b);
1652 }
1653 }
1654
1655 static inline int xfrm_policy_id2dir(u32 index)
1656 {
1657 return index & 7;
1658 }
1659
1660 #ifdef CONFIG_XFRM
1661 static inline int xfrm_aevent_is_on(struct net *net)
1662 {
1663 struct sock *nlsk;
1664 int ret = 0;
1665
1666 rcu_read_lock();
1667 nlsk = rcu_dereference(net->xfrm.nlsk);
1668 if (nlsk)
1669 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1670 rcu_read_unlock();
1671 return ret;
1672 }
1673
1674 static inline int xfrm_acquire_is_on(struct net *net)
1675 {
1676 struct sock *nlsk;
1677 int ret = 0;
1678
1679 rcu_read_lock();
1680 nlsk = rcu_dereference(net->xfrm.nlsk);
1681 if (nlsk)
1682 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1683 rcu_read_unlock();
1684
1685 return ret;
1686 }
1687 #endif
1688
1689 static inline int aead_len(struct xfrm_algo_aead *alg)
1690 {
1691 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1692 }
1693
1694 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1695 {
1696 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1697 }
1698
1699 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1700 {
1701 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1702 }
1703
1704 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1705 {
1706 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1707 }
1708
1709 #ifdef CONFIG_XFRM_MIGRATE
1710 static inline int xfrm_replay_clone(struct xfrm_state *x,
1711 struct xfrm_state *orig)
1712 {
1713 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1714 GFP_KERNEL);
1715 if (!x->replay_esn)
1716 return -ENOMEM;
1717
1718 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1719 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1720
1721 x->preplay_esn = kmemdup(x->replay_esn,
1722 xfrm_replay_state_esn_len(x->replay_esn),
1723 GFP_KERNEL);
1724 if (!x->preplay_esn) {
1725 kfree(x->replay_esn);
1726 return -ENOMEM;
1727 }
1728
1729 return 0;
1730 }
1731
1732 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1733 {
1734 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1735 }
1736
1737
1738 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1739 {
1740 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1741 }
1742
1743 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1744 {
1745 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1746 }
1747
1748 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1749 {
1750 int i;
1751 for (i = 0; i < n; i++)
1752 xfrm_state_put(*(states + i));
1753 }
1754
1755 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1756 {
1757 int i;
1758 for (i = 0; i < n; i++)
1759 xfrm_state_delete(*(states + i));
1760 }
1761 #endif
1762
1763 #ifdef CONFIG_XFRM
1764 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1765 {
1766 return skb->sp->xvec[skb->sp->len - 1];
1767 }
1768 #endif
1769
1770 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1771 {
1772 if (attrs[XFRMA_MARK])
1773 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1774 else
1775 m->v = m->m = 0;
1776
1777 return m->v & m->m;
1778 }
1779
1780 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1781 {
1782 int ret = 0;
1783
1784 if (m->m | m->v)
1785 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1786 return ret;
1787 }
1788
1789 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1790 unsigned int family)
1791 {
1792 bool tunnel = false;
1793
1794 switch(family) {
1795 case AF_INET:
1796 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1797 tunnel = true;
1798 break;
1799 case AF_INET6:
1800 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1801 tunnel = true;
1802 break;
1803 }
1804 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1805 return -EINVAL;
1806
1807 return 0;
1808 }
1809 #endif /* _NET_XFRM_H */
Linux with added FPC-III support