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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
118struct 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. */
128struct 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
235static 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
244enum {
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 */
254struct 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
269struct 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
281struct net_device;
282struct xfrm_type;
283struct xfrm_dst;
284struct 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
308int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
309int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
310void km_policy_notify(struct xfrm_policy *xp, int dir,
311 const struct km_event *c);
312void km_state_notify(struct xfrm_state *x, const struct km_event *c);
313
314struct xfrm_tmpl;
315int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
316 struct xfrm_policy *pol);
317void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
318int __xfrm_state_delete(struct xfrm_state *x);
319
320struct 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
347int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
348int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
349struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
350void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
351
352struct 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
359int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
360int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
361
362void xfrm_state_delete_tunnel(struct xfrm_state *x);
363
364struct 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
385int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
386int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
387
388struct 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. */
443enum {
444 XFRM_MODE_FLAG_TUNNEL = 1,
445};
446
447int xfrm_register_mode(struct xfrm_mode *mode, int family);
448int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
449
450static 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
462static 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
471struct 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
507struct xfrm_policy_walk_entry {
508 struct list_head all;
509 u8 dead;
510};
511
512struct xfrm_policy_walk {
513 struct xfrm_policy_walk_entry walk;
514 u8 type;
515 u32 seq;
516};
517
518struct xfrm_policy_queue {
519 struct sk_buff_head hold_queue;
520 struct timer_list hold_timer;
521 unsigned long timeout;
522};
523
524struct 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
554static inline struct net *xp_net(const struct xfrm_policy *xp)
555{
556 return read_pnet(&xp->xp_net);
557}
558
559struct xfrm_kmaddress {
560 xfrm_address_t local;
561 xfrm_address_t remote;
562 u32 reserved;
563 u16 family;
564};
565
566struct 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
591struct 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
608int xfrm_register_km(struct xfrm_mgr *km);
609int xfrm_unregister_km(struct xfrm_mgr *km);
610
611struct 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 */
630struct 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 */
652struct 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 */
684struct 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
694static 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
708static 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
721void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
722void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
723 bool task_valid);
724void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
725void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
726void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
727 struct sk_buff *skb);
728void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
729 __be32 net_seq);
730void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
731void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
732 __be32 net_seq);
733void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
734 u8 proto);
735#else
736
737static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
738 bool task_valid)
739{
740}
741
742static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
743 bool task_valid)
744{
745}
746
747static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
748 bool task_valid)
749{
750}
751
752static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
753 bool task_valid)
754{
755}
756
757static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
758 struct sk_buff *skb)
759{
760}
761
762static inline void xfrm_audit_state_replay(struct xfrm_state *x,
763 struct sk_buff *skb, __be32 net_seq)
764{
765}
766
767static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
768 u16 family)
769{
770}
771
772static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
773 __be32 net_spi, __be32 net_seq)
774{
775}
776
777static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
778 struct sk_buff *skb, u8 proto)
779{
780}
781#endif /* CONFIG_AUDITSYSCALL */
782
783static inline void xfrm_pol_hold(struct xfrm_policy *policy)
784{
785 if (likely(policy != NULL))
786 atomic_inc(&policy->refcnt);
787}
788
789void xfrm_policy_destroy(struct xfrm_policy *policy);
790
791static 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
797static 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
804void __xfrm_state_destroy(struct xfrm_state *);
805
806static inline void __xfrm_state_put(struct xfrm_state *x)
807{
808 atomic_dec(&x->refcnt);
809}
810
811static 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
817static inline void xfrm_state_hold(struct xfrm_state *x)
818{
819 atomic_inc(&x->refcnt);
820}
821
822static 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
849static 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
857static __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
884static __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
908bool 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 */
915static 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
924static 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 */
941struct 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
964static 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
979void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
980
981struct sec_path {
982 atomic_t refcnt;
983 int len;
984 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
985};
986
987static 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
996static inline struct sec_path *
997secpath_get(struct sec_path *sp)
998{
999 if (sp)
1000 atomic_inc(&sp->refcnt);
1001 return sp;
1002}
1003
1004void __secpath_destroy(struct sec_path *sp);
1005
1006static inline void
1007secpath_put(struct sec_path *sp)
1008{
1009 if (sp && atomic_dec_and_test(&sp->refcnt))
1010 __secpath_destroy(sp);
1011}
1012
1013struct sec_path *secpath_dup(struct sec_path *src);
1014
1015static inline void
1016secpath_reset(struct sk_buff *skb)
1017{
1018#ifdef CONFIG_XFRM
1019 secpath_put(skb->sp);
1020 skb->sp = NULL;
1021#endif
1022}
1023
1024static inline int
1025xfrm_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
1036static 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
1043static 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
1050static inline int
1051xfrm_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
1063int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1064 unsigned short family);
1065
1066static 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
1081static 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
1086static 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
1091static 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
1096static 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
1102static 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
1108int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1109 unsigned int family, int reverse);
1110
1111static 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
1117static 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
1124int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1125
1126static 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
1135static inline int xfrm4_route_forward(struct sk_buff *skb)
1136{
1137 return xfrm_route_forward(skb, AF_INET);
1138}
1139
1140static inline int xfrm6_route_forward(struct sk_buff *skb)
1141{
1142 return xfrm_route_forward(skb, AF_INET6);
1143}
1144
1145int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1146
1147static 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
1156int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1157
1158static 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
1174void xfrm_garbage_collect(struct net *net);
1175
1176#else
1177
1178static inline void xfrm_sk_free_policy(struct sock *sk) {}
1179static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1180static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1181static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1182static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1183{
1184 return 1;
1185}
1186static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1187{
1188 return 1;
1189}
1190static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1191{
1192 return 1;
1193}
1194static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1195 struct flowi *fl,
1196 unsigned int family)
1197{
1198 return -ENOSYS;
1199}
1200static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1201 struct sk_buff *skb)
1202{
1203 return 1;
1204}
1205static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1206 struct sk_buff *skb)
1207{
1208 return 1;
1209}
1210static inline void xfrm_garbage_collect(struct net *net)
1211{
1212}
1213#endif
1214
1215static __inline__
1216xfrm_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
1227static __inline__
1228xfrm_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
1239static __inline__
1240void 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
1256static __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
1266static __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
1278static __inline__ int
1279xfrm_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
1292static __inline__ int
1293xfrm_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
1309static inline int xfrm_state_kern(const struct xfrm_state *x)
1310{
1311 return atomic_read(&x->tunnel_users);
1312}
1313
1314static 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 */
1325struct xfrm_algo_aead_info {
1326 char *geniv;
1327 u16 icv_truncbits;
1328};
1329
1330struct xfrm_algo_auth_info {
1331 u16 icv_truncbits;
1332 u16 icv_fullbits;
1333};
1334
1335struct xfrm_algo_encr_info {
1336 char *geniv;
1337 u16 blockbits;
1338 u16 defkeybits;
1339};
1340
1341struct xfrm_algo_comp_info {
1342 u16 threshold;
1343};
1344
1345struct 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. */
1360struct 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
1371struct 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. */
1382struct 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
1390struct 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
1398void xfrm_init(void);
1399void xfrm4_init(void);
1400int xfrm_state_init(struct net *net);
1401void xfrm_state_fini(struct net *net);
1402void xfrm4_state_init(void);
1403void xfrm4_protocol_init(void);
1404#ifdef CONFIG_XFRM
1405int xfrm6_init(void);
1406void xfrm6_fini(void);
1407int xfrm6_state_init(void);
1408void xfrm6_state_fini(void);
1409int xfrm6_protocol_init(void);
1410void xfrm6_protocol_fini(void);
1411#else
1412static inline int xfrm6_init(void)
1413{
1414 return 0;
1415}
1416static inline void xfrm6_fini(void)
1417{
1418 ;
1419}
1420#endif
1421
1422#ifdef CONFIG_XFRM_STATISTICS
1423int xfrm_proc_init(struct net *net);
1424void xfrm_proc_fini(struct net *net);
1425#endif
1426
1427int xfrm_sysctl_init(struct net *net);
1428#ifdef CONFIG_SYSCTL
1429void xfrm_sysctl_fini(struct net *net);
1430#else
1431static inline void xfrm_sysctl_fini(struct net *net)
1432{
1433}
1434#endif
1435
1436void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1437 struct xfrm_address_filter *filter);
1438int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1439 int (*func)(struct xfrm_state *, int, void*), void *);
1440void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1441struct xfrm_state *xfrm_state_alloc(struct net *net);
1442struct 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);
1448struct 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);
1453struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1454 unsigned short family);
1455int xfrm_state_check_expire(struct xfrm_state *x);
1456void xfrm_state_insert(struct xfrm_state *x);
1457int xfrm_state_add(struct xfrm_state *x);
1458int xfrm_state_update(struct xfrm_state *x);
1459struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1460 const xfrm_address_t *daddr, __be32 spi,
1461 u8 proto, unsigned short family);
1462struct 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
1468int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1469 unsigned short family, struct net *net);
1470int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1471 unsigned short family);
1472#else
1473static 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
1479static 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
1486struct xfrmk_sadinfo {
1487 u32 sadhcnt; /* current hash bkts */
1488 u32 sadhmcnt; /* max allowed hash bkts */
1489 u32 sadcnt; /* current running count */
1490};
1491
1492struct 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
1503struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1504int xfrm_state_delete(struct xfrm_state *x);
1505int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1506void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1507void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1508u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1509int xfrm_init_replay(struct xfrm_state *x);
1510int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1511int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1512int xfrm_init_state(struct xfrm_state *x);
1513int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1514int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1515int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1516int xfrm_output_resume(struct sk_buff *skb, int err);
1517int xfrm_output(struct sock *sk, struct sk_buff *skb);
1518int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1519void xfrm_local_error(struct sk_buff *skb, int mtu);
1520int xfrm4_extract_header(struct sk_buff *skb);
1521int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1522int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1523 int encap_type);
1524int xfrm4_transport_finish(struct sk_buff *skb, int async);
1525int xfrm4_rcv(struct sk_buff *skb);
1526
1527static 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
1535int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1536int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1537int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1538int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1539int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1540int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1541int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1542int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1543int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1544void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1545int xfrm6_extract_header(struct sk_buff *skb);
1546int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1547int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1548int xfrm6_transport_finish(struct sk_buff *skb, int async);
1549int xfrm6_rcv(struct sk_buff *skb);
1550int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1551 xfrm_address_t *saddr, u8 proto);
1552void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1553int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1554int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1555int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1556int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1557int 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);
1560int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1561int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1562int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1563int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1564int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1565 u8 **prevhdr);
1566
1567#ifdef CONFIG_XFRM
1568int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1569int xfrm_user_policy(struct sock *sk, int optname,
1570 u8 __user *optval, int optlen);
1571#else
1572static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1573{
1574 return -ENOPROTOOPT;
1575}
1576
1577static 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
1585struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1586
1587void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1588int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1589 int (*func)(struct xfrm_policy *, int, int, void*),
1590 void *);
1591void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1592int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1593struct 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);
1598struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1599 u32 id, int delete, int *err);
1600int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1601void xfrm_policy_hash_rebuild(struct net *net);
1602u32 xfrm_get_acqseq(void);
1603int verify_spi_info(u8 proto, u32 min, u32 max);
1604int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1605struct 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);
1610int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1611
1612#ifdef CONFIG_XFRM_MIGRATE
1613int 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);
1616struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1617struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1618 struct xfrm_migrate *m);
1619int 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
1624int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1625void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1626int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1627 xfrm_address_t *addr);
1628
1629void xfrm_input_init(void);
1630int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1631
1632void xfrm_probe_algs(void);
1633int xfrm_count_pfkey_auth_supported(void);
1634int xfrm_count_pfkey_enc_supported(void);
1635struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1636struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1637struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1638struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1639struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1640struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1641struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1642struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1643struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1644 int probe);
1645
1646static 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
1653static 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
1666static inline int xfrm_policy_id2dir(u32 index)
1667{
1668 return index & 7;
1669}
1670
1671#ifdef CONFIG_XFRM
1672static 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
1685static 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
1700static inline int aead_len(struct xfrm_algo_aead *alg)
1701{
1702 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1703}
1704
1705static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1706{
1707 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1708}
1709
1710static 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
1715static 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
1721static 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
1743static 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
1749static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1750{
1751 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1752}
1753
1754static 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
1759static 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
1766static 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
1775static 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
1781static 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
1791static 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
1800static 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 */
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#else
49#define XFRM_INC_STATS(net, field) ((void)(net))
50#endif
51
52
53/* Organization of SPD aka "XFRM rules"
54 ------------------------------------
55
56 Basic objects:
57 - policy rule, struct xfrm_policy (=SPD entry)
58 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
59 - instance of a transformer, struct xfrm_state (=SA)
60 - template to clone xfrm_state, struct xfrm_tmpl
61
62 SPD is plain linear list of xfrm_policy rules, ordered by priority.
63 (To be compatible with existing pfkeyv2 implementations,
64 many rules with priority of 0x7fffffff are allowed to exist and
65 such rules are ordered in an unpredictable way, thanks to bsd folks.)
66
67 Lookup is plain linear search until the first match with selector.
68
69 If "action" is "block", then we prohibit the flow, otherwise:
70 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
71 policy entry has list of up to XFRM_MAX_DEPTH transformations,
72 described by templates xfrm_tmpl. Each template is resolved
73 to a complete xfrm_state (see below) and we pack bundle of transformations
74 to a dst_entry returned to requestor.
75
76 dst -. xfrm .-> xfrm_state #1
77 |---. child .-> dst -. xfrm .-> xfrm_state #2
78 |---. child .-> dst -. xfrm .-> xfrm_state #3
79 |---. child .-> NULL
80
81 Bundles are cached at xrfm_policy struct (field ->bundles).
82
83
84 Resolution of xrfm_tmpl
85 -----------------------
86 Template contains:
87 1. ->mode Mode: transport or tunnel
88 2. ->id.proto Protocol: AH/ESP/IPCOMP
89 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
90 Q: allow to resolve security gateway?
91 4. ->id.spi If not zero, static SPI.
92 5. ->saddr Local tunnel endpoint, ignored for transport mode.
93 6. ->algos List of allowed algos. Plain bitmask now.
94 Q: ealgos, aalgos, calgos. What a mess...
95 7. ->share Sharing mode.
96 Q: how to implement private sharing mode? To add struct sock* to
97 flow id?
98
99 Having this template we search through SAD searching for entries
100 with appropriate mode/proto/algo, permitted by selector.
101 If no appropriate entry found, it is requested from key manager.
102
103 PROBLEMS:
104 Q: How to find all the bundles referring to a physical path for
105 PMTU discovery? Seems, dst should contain list of all parents...
106 and enter to infinite locking hierarchy disaster.
107 No! It is easier, we will not search for them, let them find us.
108 We add genid to each dst plus pointer to genid of raw IP route,
109 pmtu disc will update pmtu on raw IP route and increase its genid.
110 dst_check() will see this for top level and trigger resyncing
111 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
112 */
113
114struct xfrm_state_walk {
115 struct list_head all;
116 u8 state;
117 u8 dying;
118 u8 proto;
119 u32 seq;
120 struct xfrm_address_filter *filter;
121};
122
123/* Full description of state of transformer. */
124struct xfrm_state {
125 possible_net_t xs_net;
126 union {
127 struct hlist_node gclist;
128 struct hlist_node bydst;
129 };
130 struct hlist_node bysrc;
131 struct hlist_node byspi;
132
133 atomic_t refcnt;
134 spinlock_t lock;
135
136 struct xfrm_id id;
137 struct xfrm_selector sel;
138 struct xfrm_mark mark;
139 u32 tfcpad;
140
141 u32 genid;
142
143 /* Key manager bits */
144 struct xfrm_state_walk km;
145
146 /* Parameters of this state. */
147 struct {
148 u32 reqid;
149 u8 mode;
150 u8 replay_window;
151 u8 aalgo, ealgo, calgo;
152 u8 flags;
153 u16 family;
154 xfrm_address_t saddr;
155 int header_len;
156 int trailer_len;
157 u32 extra_flags;
158 } props;
159
160 struct xfrm_lifetime_cfg lft;
161
162 /* Data for transformer */
163 struct xfrm_algo_auth *aalg;
164 struct xfrm_algo *ealg;
165 struct xfrm_algo *calg;
166 struct xfrm_algo_aead *aead;
167 const char *geniv;
168
169 /* Data for encapsulator */
170 struct xfrm_encap_tmpl *encap;
171
172 /* Data for care-of address */
173 xfrm_address_t *coaddr;
174
175 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
176 struct xfrm_state *tunnel;
177
178 /* If a tunnel, number of users + 1 */
179 atomic_t tunnel_users;
180
181 /* State for replay detection */
182 struct xfrm_replay_state replay;
183 struct xfrm_replay_state_esn *replay_esn;
184
185 /* Replay detection state at the time we sent the last notification */
186 struct xfrm_replay_state preplay;
187 struct xfrm_replay_state_esn *preplay_esn;
188
189 /* The functions for replay detection. */
190 const struct xfrm_replay *repl;
191
192 /* internal flag that only holds state for delayed aevent at the
193 * moment
194 */
195 u32 xflags;
196
197 /* Replay detection notification settings */
198 u32 replay_maxage;
199 u32 replay_maxdiff;
200
201 /* Replay detection notification timer */
202 struct timer_list rtimer;
203
204 /* Statistics */
205 struct xfrm_stats stats;
206
207 struct xfrm_lifetime_cur curlft;
208 struct tasklet_hrtimer mtimer;
209
210 /* used to fix curlft->add_time when changing date */
211 long saved_tmo;
212
213 /* Last used time */
214 unsigned long lastused;
215
216 /* Reference to data common to all the instances of this
217 * transformer. */
218 const struct xfrm_type *type;
219 struct xfrm_mode *inner_mode;
220 struct xfrm_mode *inner_mode_iaf;
221 struct xfrm_mode *outer_mode;
222
223 /* Security context */
224 struct xfrm_sec_ctx *security;
225
226 /* Private data of this transformer, format is opaque,
227 * interpreted by xfrm_type methods. */
228 void *data;
229};
230
231static inline struct net *xs_net(struct xfrm_state *x)
232{
233 return read_pnet(&x->xs_net);
234}
235
236/* xflags - make enum if more show up */
237#define XFRM_TIME_DEFER 1
238#define XFRM_SOFT_EXPIRE 2
239
240enum {
241 XFRM_STATE_VOID,
242 XFRM_STATE_ACQ,
243 XFRM_STATE_VALID,
244 XFRM_STATE_ERROR,
245 XFRM_STATE_EXPIRED,
246 XFRM_STATE_DEAD
247};
248
249/* callback structure passed from either netlink or pfkey */
250struct km_event {
251 union {
252 u32 hard;
253 u32 proto;
254 u32 byid;
255 u32 aevent;
256 u32 type;
257 } data;
258
259 u32 seq;
260 u32 portid;
261 u32 event;
262 struct net *net;
263};
264
265struct xfrm_replay {
266 void (*advance)(struct xfrm_state *x, __be32 net_seq);
267 int (*check)(struct xfrm_state *x,
268 struct sk_buff *skb,
269 __be32 net_seq);
270 int (*recheck)(struct xfrm_state *x,
271 struct sk_buff *skb,
272 __be32 net_seq);
273 void (*notify)(struct xfrm_state *x, int event);
274 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
275};
276
277struct net_device;
278struct xfrm_type;
279struct xfrm_dst;
280struct xfrm_policy_afinfo {
281 unsigned short family;
282 struct dst_ops *dst_ops;
283 void (*garbage_collect)(struct net *net);
284 struct dst_entry *(*dst_lookup)(struct net *net,
285 int tos, int oif,
286 const xfrm_address_t *saddr,
287 const xfrm_address_t *daddr);
288 int (*get_saddr)(struct net *net, int oif,
289 xfrm_address_t *saddr,
290 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 int (*init_path)(struct xfrm_dst *path,
296 struct dst_entry *dst,
297 int nfheader_len);
298 int (*fill_dst)(struct xfrm_dst *xdst,
299 struct net_device *dev,
300 const struct flowi *fl);
301 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
302};
303
304int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
305int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
306void km_policy_notify(struct xfrm_policy *xp, int dir,
307 const struct km_event *c);
308void km_state_notify(struct xfrm_state *x, const struct km_event *c);
309
310struct xfrm_tmpl;
311int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
312 struct xfrm_policy *pol);
313void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
314int __xfrm_state_delete(struct xfrm_state *x);
315
316struct xfrm_state_afinfo {
317 unsigned int family;
318 unsigned int proto;
319 __be16 eth_proto;
320 struct module *owner;
321 const struct xfrm_type *type_map[IPPROTO_MAX];
322 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
323 int (*init_flags)(struct xfrm_state *x);
324 void (*init_tempsel)(struct xfrm_selector *sel,
325 const struct flowi *fl);
326 void (*init_temprop)(struct xfrm_state *x,
327 const struct xfrm_tmpl *tmpl,
328 const xfrm_address_t *daddr,
329 const xfrm_address_t *saddr);
330 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
331 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
332 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
333 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
334 int (*extract_input)(struct xfrm_state *x,
335 struct sk_buff *skb);
336 int (*extract_output)(struct xfrm_state *x,
337 struct sk_buff *skb);
338 int (*transport_finish)(struct sk_buff *skb,
339 int async);
340 void (*local_error)(struct sk_buff *skb, u32 mtu);
341};
342
343int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
344int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
345struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
346void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
347
348struct xfrm_input_afinfo {
349 unsigned int family;
350 struct module *owner;
351 int (*callback)(struct sk_buff *skb, u8 protocol,
352 int err);
353};
354
355int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
356int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
357
358void xfrm_state_delete_tunnel(struct xfrm_state *x);
359
360struct xfrm_type {
361 char *description;
362 struct module *owner;
363 u8 proto;
364 u8 flags;
365#define XFRM_TYPE_NON_FRAGMENT 1
366#define XFRM_TYPE_REPLAY_PROT 2
367#define XFRM_TYPE_LOCAL_COADDR 4
368#define XFRM_TYPE_REMOTE_COADDR 8
369
370 int (*init_state)(struct xfrm_state *x);
371 void (*destructor)(struct xfrm_state *);
372 int (*input)(struct xfrm_state *, struct sk_buff *skb);
373 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
374 int (*reject)(struct xfrm_state *, struct sk_buff *,
375 const struct flowi *);
376 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
377 /* Estimate maximal size of result of transformation of a dgram */
378 u32 (*get_mtu)(struct xfrm_state *, int size);
379};
380
381int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
382int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
383
384struct xfrm_mode {
385 /*
386 * Remove encapsulation header.
387 *
388 * The IP header will be moved over the top of the encapsulation
389 * header.
390 *
391 * On entry, the transport header shall point to where the IP header
392 * should be and the network header shall be set to where the IP
393 * header currently is. skb->data shall point to the start of the
394 * payload.
395 */
396 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
397
398 /*
399 * This is the actual input entry point.
400 *
401 * For transport mode and equivalent this would be identical to
402 * input2 (which does not need to be set). While tunnel mode
403 * and equivalent would set this to the tunnel encapsulation function
404 * xfrm4_prepare_input that would in turn call input2.
405 */
406 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
407
408 /*
409 * Add encapsulation header.
410 *
411 * On exit, the transport header will be set to the start of the
412 * encapsulation header to be filled in by x->type->output and
413 * the mac header will be set to the nextheader (protocol for
414 * IPv4) field of the extension header directly preceding the
415 * encapsulation header, or in its absence, that of the top IP
416 * header. The value of the network header will always point
417 * to the top IP header while skb->data will point to the payload.
418 */
419 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
420
421 /*
422 * This is the actual output entry point.
423 *
424 * For transport mode and equivalent this would be identical to
425 * output2 (which does not need to be set). While tunnel mode
426 * and equivalent would set this to a tunnel encapsulation function
427 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
428 * call output2.
429 */
430 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
431
432 struct xfrm_state_afinfo *afinfo;
433 struct module *owner;
434 unsigned int encap;
435 int flags;
436};
437
438/* Flags for xfrm_mode. */
439enum {
440 XFRM_MODE_FLAG_TUNNEL = 1,
441};
442
443int xfrm_register_mode(struct xfrm_mode *mode, int family);
444int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
445
446static inline int xfrm_af2proto(unsigned int family)
447{
448 switch(family) {
449 case AF_INET:
450 return IPPROTO_IPIP;
451 case AF_INET6:
452 return IPPROTO_IPV6;
453 default:
454 return 0;
455 }
456}
457
458static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
459{
460 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
461 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
462 return x->inner_mode;
463 else
464 return x->inner_mode_iaf;
465}
466
467struct xfrm_tmpl {
468/* id in template is interpreted as:
469 * daddr - destination of tunnel, may be zero for transport mode.
470 * spi - zero to acquire spi. Not zero if spi is static, then
471 * daddr must be fixed too.
472 * proto - AH/ESP/IPCOMP
473 */
474 struct xfrm_id id;
475
476/* Source address of tunnel. Ignored, if it is not a tunnel. */
477 xfrm_address_t saddr;
478
479 unsigned short encap_family;
480
481 u32 reqid;
482
483/* Mode: transport, tunnel etc. */
484 u8 mode;
485
486/* Sharing mode: unique, this session only, this user only etc. */
487 u8 share;
488
489/* May skip this transfomration if no SA is found */
490 u8 optional;
491
492/* Skip aalgos/ealgos/calgos checks. */
493 u8 allalgs;
494
495/* Bit mask of algos allowed for acquisition */
496 u32 aalgos;
497 u32 ealgos;
498 u32 calgos;
499};
500
501#define XFRM_MAX_DEPTH 6
502
503struct xfrm_policy_walk_entry {
504 struct list_head all;
505 u8 dead;
506};
507
508struct xfrm_policy_walk {
509 struct xfrm_policy_walk_entry walk;
510 u8 type;
511 u32 seq;
512};
513
514struct xfrm_policy_queue {
515 struct sk_buff_head hold_queue;
516 struct timer_list hold_timer;
517 unsigned long timeout;
518};
519
520struct xfrm_policy {
521 possible_net_t xp_net;
522 struct hlist_node bydst;
523 struct hlist_node byidx;
524
525 /* This lock only affects elements except for entry. */
526 rwlock_t lock;
527 atomic_t refcnt;
528 struct timer_list timer;
529
530 struct flow_cache_object flo;
531 atomic_t genid;
532 u32 priority;
533 u32 index;
534 struct xfrm_mark mark;
535 struct xfrm_selector selector;
536 struct xfrm_lifetime_cfg lft;
537 struct xfrm_lifetime_cur curlft;
538 struct xfrm_policy_walk_entry walk;
539 struct xfrm_policy_queue polq;
540 u8 type;
541 u8 action;
542 u8 flags;
543 u8 xfrm_nr;
544 u16 family;
545 struct xfrm_sec_ctx *security;
546 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
547 struct rcu_head rcu;
548};
549
550static inline struct net *xp_net(const struct xfrm_policy *xp)
551{
552 return read_pnet(&xp->xp_net);
553}
554
555struct xfrm_kmaddress {
556 xfrm_address_t local;
557 xfrm_address_t remote;
558 u32 reserved;
559 u16 family;
560};
561
562struct xfrm_migrate {
563 xfrm_address_t old_daddr;
564 xfrm_address_t old_saddr;
565 xfrm_address_t new_daddr;
566 xfrm_address_t new_saddr;
567 u8 proto;
568 u8 mode;
569 u16 reserved;
570 u32 reqid;
571 u16 old_family;
572 u16 new_family;
573};
574
575#define XFRM_KM_TIMEOUT 30
576/* what happened */
577#define XFRM_REPLAY_UPDATE XFRM_AE_CR
578#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
579
580/* default aevent timeout in units of 100ms */
581#define XFRM_AE_ETIME 10
582/* Async Event timer multiplier */
583#define XFRM_AE_ETH_M 10
584/* default seq threshold size */
585#define XFRM_AE_SEQT_SIZE 2
586
587struct xfrm_mgr {
588 struct list_head list;
589 char *id;
590 int (*notify)(struct xfrm_state *x, const struct km_event *c);
591 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
592 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
593 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
594 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
595 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
596 int (*migrate)(const struct xfrm_selector *sel,
597 u8 dir, u8 type,
598 const struct xfrm_migrate *m,
599 int num_bundles,
600 const struct xfrm_kmaddress *k);
601 bool (*is_alive)(const struct km_event *c);
602};
603
604int xfrm_register_km(struct xfrm_mgr *km);
605int xfrm_unregister_km(struct xfrm_mgr *km);
606
607struct xfrm_tunnel_skb_cb {
608 union {
609 struct inet_skb_parm h4;
610 struct inet6_skb_parm h6;
611 } header;
612
613 union {
614 struct ip_tunnel *ip4;
615 struct ip6_tnl *ip6;
616 } tunnel;
617};
618
619#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
620
621/*
622 * This structure is used for the duration where packets are being
623 * transformed by IPsec. As soon as the packet leaves IPsec the
624 * area beyond the generic IP part may be overwritten.
625 */
626struct xfrm_skb_cb {
627 struct xfrm_tunnel_skb_cb header;
628
629 /* Sequence number for replay protection. */
630 union {
631 struct {
632 __u32 low;
633 __u32 hi;
634 } output;
635 struct {
636 __be32 low;
637 __be32 hi;
638 } input;
639 } seq;
640};
641
642#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
643
644/*
645 * This structure is used by the afinfo prepare_input/prepare_output functions
646 * to transmit header information to the mode input/output functions.
647 */
648struct xfrm_mode_skb_cb {
649 struct xfrm_tunnel_skb_cb header;
650
651 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
652 __be16 id;
653 __be16 frag_off;
654
655 /* IP header length (excluding options or extension headers). */
656 u8 ihl;
657
658 /* TOS for IPv4, class for IPv6. */
659 u8 tos;
660
661 /* TTL for IPv4, hop limitfor IPv6. */
662 u8 ttl;
663
664 /* Protocol for IPv4, NH for IPv6. */
665 u8 protocol;
666
667 /* Option length for IPv4, zero for IPv6. */
668 u8 optlen;
669
670 /* Used by IPv6 only, zero for IPv4. */
671 u8 flow_lbl[3];
672};
673
674#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
675
676/*
677 * This structure is used by the input processing to locate the SPI and
678 * related information.
679 */
680struct xfrm_spi_skb_cb {
681 struct xfrm_tunnel_skb_cb header;
682
683 unsigned int daddroff;
684 unsigned int family;
685};
686
687#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
688
689#ifdef CONFIG_AUDITSYSCALL
690static inline struct audit_buffer *xfrm_audit_start(const char *op)
691{
692 struct audit_buffer *audit_buf = NULL;
693
694 if (audit_enabled == 0)
695 return NULL;
696 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
697 AUDIT_MAC_IPSEC_EVENT);
698 if (audit_buf == NULL)
699 return NULL;
700 audit_log_format(audit_buf, "op=%s", op);
701 return audit_buf;
702}
703
704static inline void xfrm_audit_helper_usrinfo(bool task_valid,
705 struct audit_buffer *audit_buf)
706{
707 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
708 audit_get_loginuid(current) :
709 INVALID_UID);
710 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
711 (unsigned int) -1;
712
713 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
714 audit_log_task_context(audit_buf);
715}
716
717void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
718void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
719 bool task_valid);
720void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
721void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
722void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
723 struct sk_buff *skb);
724void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
725 __be32 net_seq);
726void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
727void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
728 __be32 net_seq);
729void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
730 u8 proto);
731#else
732
733static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
734 bool task_valid)
735{
736}
737
738static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
739 bool task_valid)
740{
741}
742
743static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
744 bool task_valid)
745{
746}
747
748static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
749 bool task_valid)
750{
751}
752
753static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
754 struct sk_buff *skb)
755{
756}
757
758static inline void xfrm_audit_state_replay(struct xfrm_state *x,
759 struct sk_buff *skb, __be32 net_seq)
760{
761}
762
763static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
764 u16 family)
765{
766}
767
768static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
769 __be32 net_spi, __be32 net_seq)
770{
771}
772
773static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
774 struct sk_buff *skb, u8 proto)
775{
776}
777#endif /* CONFIG_AUDITSYSCALL */
778
779static inline void xfrm_pol_hold(struct xfrm_policy *policy)
780{
781 if (likely(policy != NULL))
782 atomic_inc(&policy->refcnt);
783}
784
785void xfrm_policy_destroy(struct xfrm_policy *policy);
786
787static inline void xfrm_pol_put(struct xfrm_policy *policy)
788{
789 if (atomic_dec_and_test(&policy->refcnt))
790 xfrm_policy_destroy(policy);
791}
792
793static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
794{
795 int i;
796 for (i = npols - 1; i >= 0; --i)
797 xfrm_pol_put(pols[i]);
798}
799
800void __xfrm_state_destroy(struct xfrm_state *);
801
802static inline void __xfrm_state_put(struct xfrm_state *x)
803{
804 atomic_dec(&x->refcnt);
805}
806
807static inline void xfrm_state_put(struct xfrm_state *x)
808{
809 if (atomic_dec_and_test(&x->refcnt))
810 __xfrm_state_destroy(x);
811}
812
813static inline void xfrm_state_hold(struct xfrm_state *x)
814{
815 atomic_inc(&x->refcnt);
816}
817
818static inline bool addr_match(const void *token1, const void *token2,
819 int prefixlen)
820{
821 const __be32 *a1 = token1;
822 const __be32 *a2 = token2;
823 int pdw;
824 int pbi;
825
826 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
827 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
828
829 if (pdw)
830 if (memcmp(a1, a2, pdw << 2))
831 return false;
832
833 if (pbi) {
834 __be32 mask;
835
836 mask = htonl((0xffffffff) << (32 - pbi));
837
838 if ((a1[pdw] ^ a2[pdw]) & mask)
839 return false;
840 }
841
842 return true;
843}
844
845static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
846{
847 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
848 if (prefixlen == 0)
849 return true;
850 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
851}
852
853static __inline__
854__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
855{
856 __be16 port;
857 switch(fl->flowi_proto) {
858 case IPPROTO_TCP:
859 case IPPROTO_UDP:
860 case IPPROTO_UDPLITE:
861 case IPPROTO_SCTP:
862 port = uli->ports.sport;
863 break;
864 case IPPROTO_ICMP:
865 case IPPROTO_ICMPV6:
866 port = htons(uli->icmpt.type);
867 break;
868 case IPPROTO_MH:
869 port = htons(uli->mht.type);
870 break;
871 case IPPROTO_GRE:
872 port = htons(ntohl(uli->gre_key) >> 16);
873 break;
874 default:
875 port = 0; /*XXX*/
876 }
877 return port;
878}
879
880static __inline__
881__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
882{
883 __be16 port;
884 switch(fl->flowi_proto) {
885 case IPPROTO_TCP:
886 case IPPROTO_UDP:
887 case IPPROTO_UDPLITE:
888 case IPPROTO_SCTP:
889 port = uli->ports.dport;
890 break;
891 case IPPROTO_ICMP:
892 case IPPROTO_ICMPV6:
893 port = htons(uli->icmpt.code);
894 break;
895 case IPPROTO_GRE:
896 port = htons(ntohl(uli->gre_key) & 0xffff);
897 break;
898 default:
899 port = 0; /*XXX*/
900 }
901 return port;
902}
903
904bool xfrm_selector_match(const struct xfrm_selector *sel,
905 const struct flowi *fl, unsigned short family);
906
907#ifdef CONFIG_SECURITY_NETWORK_XFRM
908/* If neither has a context --> match
909 * Otherwise, both must have a context and the sids, doi, alg must match
910 */
911static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
912{
913 return ((!s1 && !s2) ||
914 (s1 && s2 &&
915 (s1->ctx_sid == s2->ctx_sid) &&
916 (s1->ctx_doi == s2->ctx_doi) &&
917 (s1->ctx_alg == s2->ctx_alg)));
918}
919#else
920static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
921{
922 return true;
923}
924#endif
925
926/* A struct encoding bundle of transformations to apply to some set of flow.
927 *
928 * dst->child points to the next element of bundle.
929 * dst->xfrm points to an instanse of transformer.
930 *
931 * Due to unfortunate limitations of current routing cache, which we
932 * have no time to fix, it mirrors struct rtable and bound to the same
933 * routing key, including saddr,daddr. However, we can have many of
934 * bundles differing by session id. All the bundles grow from a parent
935 * policy rule.
936 */
937struct xfrm_dst {
938 union {
939 struct dst_entry dst;
940 struct rtable rt;
941 struct rt6_info rt6;
942 } u;
943 struct dst_entry *route;
944 struct flow_cache_object flo;
945 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
946 int num_pols, num_xfrms;
947#ifdef CONFIG_XFRM_SUB_POLICY
948 struct flowi *origin;
949 struct xfrm_selector *partner;
950#endif
951 u32 xfrm_genid;
952 u32 policy_genid;
953 u32 route_mtu_cached;
954 u32 child_mtu_cached;
955 u32 route_cookie;
956 u32 path_cookie;
957};
958
959#ifdef CONFIG_XFRM
960static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
961{
962 xfrm_pols_put(xdst->pols, xdst->num_pols);
963 dst_release(xdst->route);
964 if (likely(xdst->u.dst.xfrm))
965 xfrm_state_put(xdst->u.dst.xfrm);
966#ifdef CONFIG_XFRM_SUB_POLICY
967 kfree(xdst->origin);
968 xdst->origin = NULL;
969 kfree(xdst->partner);
970 xdst->partner = NULL;
971#endif
972}
973#endif
974
975void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
976
977struct sec_path {
978 atomic_t refcnt;
979 int len;
980 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
981};
982
983static inline int secpath_exists(struct sk_buff *skb)
984{
985#ifdef CONFIG_XFRM
986 return skb->sp != NULL;
987#else
988 return 0;
989#endif
990}
991
992static inline struct sec_path *
993secpath_get(struct sec_path *sp)
994{
995 if (sp)
996 atomic_inc(&sp->refcnt);
997 return sp;
998}
999
1000void __secpath_destroy(struct sec_path *sp);
1001
1002static inline void
1003secpath_put(struct sec_path *sp)
1004{
1005 if (sp && atomic_dec_and_test(&sp->refcnt))
1006 __secpath_destroy(sp);
1007}
1008
1009struct sec_path *secpath_dup(struct sec_path *src);
1010
1011static inline void
1012secpath_reset(struct sk_buff *skb)
1013{
1014#ifdef CONFIG_XFRM
1015 secpath_put(skb->sp);
1016 skb->sp = NULL;
1017#endif
1018}
1019
1020static inline int
1021xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1022{
1023 switch (family) {
1024 case AF_INET:
1025 return addr->a4 == 0;
1026 case AF_INET6:
1027 return ipv6_addr_any(&addr->in6);
1028 }
1029 return 0;
1030}
1031
1032static inline int
1033__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1034{
1035 return (tmpl->saddr.a4 &&
1036 tmpl->saddr.a4 != x->props.saddr.a4);
1037}
1038
1039static inline int
1040__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1041{
1042 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1043 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1044}
1045
1046static inline int
1047xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1048{
1049 switch (family) {
1050 case AF_INET:
1051 return __xfrm4_state_addr_cmp(tmpl, x);
1052 case AF_INET6:
1053 return __xfrm6_state_addr_cmp(tmpl, x);
1054 }
1055 return !0;
1056}
1057
1058#ifdef CONFIG_XFRM
1059int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1060 unsigned short family);
1061
1062static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1063 struct sk_buff *skb,
1064 unsigned int family, int reverse)
1065{
1066 struct net *net = dev_net(skb->dev);
1067 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1068
1069 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1070 return __xfrm_policy_check(sk, ndir, skb, family);
1071
1072 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1073 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1074 __xfrm_policy_check(sk, ndir, skb, family);
1075}
1076
1077static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1078{
1079 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1080}
1081
1082static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1083{
1084 return xfrm_policy_check(sk, dir, skb, AF_INET);
1085}
1086
1087static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1088{
1089 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1090}
1091
1092static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1093 struct sk_buff *skb)
1094{
1095 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1096}
1097
1098static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1099 struct sk_buff *skb)
1100{
1101 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1102}
1103
1104int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1105 unsigned int family, int reverse);
1106
1107static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1108 unsigned int family)
1109{
1110 return __xfrm_decode_session(skb, fl, family, 0);
1111}
1112
1113static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1114 struct flowi *fl,
1115 unsigned int family)
1116{
1117 return __xfrm_decode_session(skb, fl, family, 1);
1118}
1119
1120int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1121
1122static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1123{
1124 struct net *net = dev_net(skb->dev);
1125
1126 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1127 (skb_dst(skb)->flags & DST_NOXFRM) ||
1128 __xfrm_route_forward(skb, family);
1129}
1130
1131static inline int xfrm4_route_forward(struct sk_buff *skb)
1132{
1133 return xfrm_route_forward(skb, AF_INET);
1134}
1135
1136static inline int xfrm6_route_forward(struct sk_buff *skb)
1137{
1138 return xfrm_route_forward(skb, AF_INET6);
1139}
1140
1141int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1142
1143static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1144{
1145 sk->sk_policy[0] = NULL;
1146 sk->sk_policy[1] = NULL;
1147 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1148 return __xfrm_sk_clone_policy(sk, osk);
1149 return 0;
1150}
1151
1152int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1153
1154static inline void xfrm_sk_free_policy(struct sock *sk)
1155{
1156 struct xfrm_policy *pol;
1157
1158 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1159 if (unlikely(pol != NULL)) {
1160 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1161 sk->sk_policy[0] = NULL;
1162 }
1163 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1164 if (unlikely(pol != NULL)) {
1165 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1166 sk->sk_policy[1] = NULL;
1167 }
1168}
1169
1170void xfrm_garbage_collect(struct net *net);
1171
1172#else
1173
1174static inline void xfrm_sk_free_policy(struct sock *sk) {}
1175static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1176static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1177static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1178static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1179{
1180 return 1;
1181}
1182static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1183{
1184 return 1;
1185}
1186static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1187{
1188 return 1;
1189}
1190static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1191 struct flowi *fl,
1192 unsigned int family)
1193{
1194 return -ENOSYS;
1195}
1196static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1197 struct sk_buff *skb)
1198{
1199 return 1;
1200}
1201static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1202 struct sk_buff *skb)
1203{
1204 return 1;
1205}
1206static inline void xfrm_garbage_collect(struct net *net)
1207{
1208}
1209#endif
1210
1211static __inline__
1212xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1213{
1214 switch (family){
1215 case AF_INET:
1216 return (xfrm_address_t *)&fl->u.ip4.daddr;
1217 case AF_INET6:
1218 return (xfrm_address_t *)&fl->u.ip6.daddr;
1219 }
1220 return NULL;
1221}
1222
1223static __inline__
1224xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1225{
1226 switch (family){
1227 case AF_INET:
1228 return (xfrm_address_t *)&fl->u.ip4.saddr;
1229 case AF_INET6:
1230 return (xfrm_address_t *)&fl->u.ip6.saddr;
1231 }
1232 return NULL;
1233}
1234
1235static __inline__
1236void xfrm_flowi_addr_get(const struct flowi *fl,
1237 xfrm_address_t *saddr, xfrm_address_t *daddr,
1238 unsigned short family)
1239{
1240 switch(family) {
1241 case AF_INET:
1242 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1243 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1244 break;
1245 case AF_INET6:
1246 saddr->in6 = fl->u.ip6.saddr;
1247 daddr->in6 = fl->u.ip6.daddr;
1248 break;
1249 }
1250}
1251
1252static __inline__ int
1253__xfrm4_state_addr_check(const struct xfrm_state *x,
1254 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1255{
1256 if (daddr->a4 == x->id.daddr.a4 &&
1257 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1258 return 1;
1259 return 0;
1260}
1261
1262static __inline__ int
1263__xfrm6_state_addr_check(const struct xfrm_state *x,
1264 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1265{
1266 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1267 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1268 ipv6_addr_any((struct in6_addr *)saddr) ||
1269 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1270 return 1;
1271 return 0;
1272}
1273
1274static __inline__ int
1275xfrm_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1277 unsigned short family)
1278{
1279 switch (family) {
1280 case AF_INET:
1281 return __xfrm4_state_addr_check(x, daddr, saddr);
1282 case AF_INET6:
1283 return __xfrm6_state_addr_check(x, daddr, saddr);
1284 }
1285 return 0;
1286}
1287
1288static __inline__ int
1289xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1290 unsigned short family)
1291{
1292 switch (family) {
1293 case AF_INET:
1294 return __xfrm4_state_addr_check(x,
1295 (const xfrm_address_t *)&fl->u.ip4.daddr,
1296 (const xfrm_address_t *)&fl->u.ip4.saddr);
1297 case AF_INET6:
1298 return __xfrm6_state_addr_check(x,
1299 (const xfrm_address_t *)&fl->u.ip6.daddr,
1300 (const xfrm_address_t *)&fl->u.ip6.saddr);
1301 }
1302 return 0;
1303}
1304
1305static inline int xfrm_state_kern(const struct xfrm_state *x)
1306{
1307 return atomic_read(&x->tunnel_users);
1308}
1309
1310static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1311{
1312 return (!userproto || proto == userproto ||
1313 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1314 proto == IPPROTO_ESP ||
1315 proto == IPPROTO_COMP)));
1316}
1317
1318/*
1319 * xfrm algorithm information
1320 */
1321struct xfrm_algo_aead_info {
1322 char *geniv;
1323 u16 icv_truncbits;
1324};
1325
1326struct xfrm_algo_auth_info {
1327 u16 icv_truncbits;
1328 u16 icv_fullbits;
1329};
1330
1331struct xfrm_algo_encr_info {
1332 char *geniv;
1333 u16 blockbits;
1334 u16 defkeybits;
1335};
1336
1337struct xfrm_algo_comp_info {
1338 u16 threshold;
1339};
1340
1341struct xfrm_algo_desc {
1342 char *name;
1343 char *compat;
1344 u8 available:1;
1345 u8 pfkey_supported:1;
1346 union {
1347 struct xfrm_algo_aead_info aead;
1348 struct xfrm_algo_auth_info auth;
1349 struct xfrm_algo_encr_info encr;
1350 struct xfrm_algo_comp_info comp;
1351 } uinfo;
1352 struct sadb_alg desc;
1353};
1354
1355/* XFRM protocol handlers. */
1356struct xfrm4_protocol {
1357 int (*handler)(struct sk_buff *skb);
1358 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1359 int encap_type);
1360 int (*cb_handler)(struct sk_buff *skb, int err);
1361 int (*err_handler)(struct sk_buff *skb, u32 info);
1362
1363 struct xfrm4_protocol __rcu *next;
1364 int priority;
1365};
1366
1367struct xfrm6_protocol {
1368 int (*handler)(struct sk_buff *skb);
1369 int (*cb_handler)(struct sk_buff *skb, int err);
1370 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1371 u8 type, u8 code, int offset, __be32 info);
1372
1373 struct xfrm6_protocol __rcu *next;
1374 int priority;
1375};
1376
1377/* XFRM tunnel handlers. */
1378struct xfrm_tunnel {
1379 int (*handler)(struct sk_buff *skb);
1380 int (*err_handler)(struct sk_buff *skb, u32 info);
1381
1382 struct xfrm_tunnel __rcu *next;
1383 int priority;
1384};
1385
1386struct xfrm6_tunnel {
1387 int (*handler)(struct sk_buff *skb);
1388 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1389 u8 type, u8 code, int offset, __be32 info);
1390 struct xfrm6_tunnel __rcu *next;
1391 int priority;
1392};
1393
1394void xfrm_init(void);
1395void xfrm4_init(void);
1396int xfrm_state_init(struct net *net);
1397void xfrm_state_fini(struct net *net);
1398void xfrm4_state_init(void);
1399void xfrm4_protocol_init(void);
1400#ifdef CONFIG_XFRM
1401int xfrm6_init(void);
1402void xfrm6_fini(void);
1403int xfrm6_state_init(void);
1404void xfrm6_state_fini(void);
1405int xfrm6_protocol_init(void);
1406void xfrm6_protocol_fini(void);
1407#else
1408static inline int xfrm6_init(void)
1409{
1410 return 0;
1411}
1412static inline void xfrm6_fini(void)
1413{
1414 ;
1415}
1416#endif
1417
1418#ifdef CONFIG_XFRM_STATISTICS
1419int xfrm_proc_init(struct net *net);
1420void xfrm_proc_fini(struct net *net);
1421#endif
1422
1423int xfrm_sysctl_init(struct net *net);
1424#ifdef CONFIG_SYSCTL
1425void xfrm_sysctl_fini(struct net *net);
1426#else
1427static inline void xfrm_sysctl_fini(struct net *net)
1428{
1429}
1430#endif
1431
1432void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1433 struct xfrm_address_filter *filter);
1434int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1435 int (*func)(struct xfrm_state *, int, void*), void *);
1436void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1437struct xfrm_state *xfrm_state_alloc(struct net *net);
1438struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1439 const xfrm_address_t *saddr,
1440 const struct flowi *fl,
1441 struct xfrm_tmpl *tmpl,
1442 struct xfrm_policy *pol, int *err,
1443 unsigned short family);
1444struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1445 xfrm_address_t *daddr,
1446 xfrm_address_t *saddr,
1447 unsigned short family,
1448 u8 mode, u8 proto, u32 reqid);
1449struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1450 unsigned short family);
1451int xfrm_state_check_expire(struct xfrm_state *x);
1452void xfrm_state_insert(struct xfrm_state *x);
1453int xfrm_state_add(struct xfrm_state *x);
1454int xfrm_state_update(struct xfrm_state *x);
1455struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1456 const xfrm_address_t *daddr, __be32 spi,
1457 u8 proto, unsigned short family);
1458struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1459 const xfrm_address_t *daddr,
1460 const xfrm_address_t *saddr,
1461 u8 proto,
1462 unsigned short family);
1463#ifdef CONFIG_XFRM_SUB_POLICY
1464int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1465 unsigned short family, struct net *net);
1466int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1467 unsigned short family);
1468#else
1469static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1470 int n, unsigned short family, struct net *net)
1471{
1472 return -ENOSYS;
1473}
1474
1475static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1476 int n, unsigned short family)
1477{
1478 return -ENOSYS;
1479}
1480#endif
1481
1482struct xfrmk_sadinfo {
1483 u32 sadhcnt; /* current hash bkts */
1484 u32 sadhmcnt; /* max allowed hash bkts */
1485 u32 sadcnt; /* current running count */
1486};
1487
1488struct xfrmk_spdinfo {
1489 u32 incnt;
1490 u32 outcnt;
1491 u32 fwdcnt;
1492 u32 inscnt;
1493 u32 outscnt;
1494 u32 fwdscnt;
1495 u32 spdhcnt;
1496 u32 spdhmcnt;
1497};
1498
1499struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1500int xfrm_state_delete(struct xfrm_state *x);
1501int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1502void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1503void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1504u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1505int xfrm_init_replay(struct xfrm_state *x);
1506int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1507int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1508int xfrm_init_state(struct xfrm_state *x);
1509int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1510int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1511int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1512int xfrm_output_resume(struct sk_buff *skb, int err);
1513int xfrm_output(struct sock *sk, struct sk_buff *skb);
1514int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1515void xfrm_local_error(struct sk_buff *skb, int mtu);
1516int xfrm4_extract_header(struct sk_buff *skb);
1517int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1518int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1519 int encap_type);
1520int xfrm4_transport_finish(struct sk_buff *skb, int async);
1521int xfrm4_rcv(struct sk_buff *skb);
1522
1523static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1524{
1525 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1526 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1527 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1528 return xfrm_input(skb, nexthdr, spi, 0);
1529}
1530
1531int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1532int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1533int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1534int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1535int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1536int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1537int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1538int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1539int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1540void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1541int xfrm6_extract_header(struct sk_buff *skb);
1542int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1543int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1544 struct ip6_tnl *t);
1545int xfrm6_transport_finish(struct sk_buff *skb, int async);
1546int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1547int xfrm6_rcv(struct sk_buff *skb);
1548int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1549 xfrm_address_t *saddr, u8 proto);
1550void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1551int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1552int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1553int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1554int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1555int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1556__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1557__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1558int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1559int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1560int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1561int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1562int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1563 u8 **prevhdr);
1564
1565#ifdef CONFIG_XFRM
1566int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1567int xfrm_user_policy(struct sock *sk, int optname,
1568 u8 __user *optval, int optlen);
1569#else
1570static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1571{
1572 return -ENOPROTOOPT;
1573}
1574
1575static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1576{
1577 /* should not happen */
1578 kfree_skb(skb);
1579 return 0;
1580}
1581#endif
1582
1583struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1584
1585void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1586int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1587 int (*func)(struct xfrm_policy *, int, int, void*),
1588 void *);
1589void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1590int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1591struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1592 u8 type, int dir,
1593 struct xfrm_selector *sel,
1594 struct xfrm_sec_ctx *ctx, int delete,
1595 int *err);
1596struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1597 u32 id, int delete, int *err);
1598int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1599void xfrm_policy_hash_rebuild(struct net *net);
1600u32 xfrm_get_acqseq(void);
1601int verify_spi_info(u8 proto, u32 min, u32 max);
1602int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1603struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1604 u8 mode, u32 reqid, u8 proto,
1605 const xfrm_address_t *daddr,
1606 const xfrm_address_t *saddr, int create,
1607 unsigned short family);
1608int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1609
1610#ifdef CONFIG_XFRM_MIGRATE
1611int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1612 const struct xfrm_migrate *m, int num_bundles,
1613 const struct xfrm_kmaddress *k);
1614struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1615struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1616 struct xfrm_migrate *m);
1617int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1618 struct xfrm_migrate *m, int num_bundles,
1619 struct xfrm_kmaddress *k, struct net *net);
1620#endif
1621
1622int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1623void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1624int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1625 xfrm_address_t *addr);
1626
1627void xfrm_input_init(void);
1628int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1629
1630void xfrm_probe_algs(void);
1631int xfrm_count_pfkey_auth_supported(void);
1632int xfrm_count_pfkey_enc_supported(void);
1633struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1634struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1635struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1636struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1637struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1638struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1639struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1640struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1641struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1642 int probe);
1643
1644static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1645 const xfrm_address_t *b)
1646{
1647 return ipv6_addr_equal((const struct in6_addr *)a,
1648 (const struct in6_addr *)b);
1649}
1650
1651static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1652 const xfrm_address_t *b,
1653 sa_family_t family)
1654{
1655 switch (family) {
1656 default:
1657 case AF_INET:
1658 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1659 case AF_INET6:
1660 return xfrm6_addr_equal(a, b);
1661 }
1662}
1663
1664static inline int xfrm_policy_id2dir(u32 index)
1665{
1666 return index & 7;
1667}
1668
1669#ifdef CONFIG_XFRM
1670static inline int xfrm_aevent_is_on(struct net *net)
1671{
1672 struct sock *nlsk;
1673 int ret = 0;
1674
1675 rcu_read_lock();
1676 nlsk = rcu_dereference(net->xfrm.nlsk);
1677 if (nlsk)
1678 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1679 rcu_read_unlock();
1680 return ret;
1681}
1682
1683static inline int xfrm_acquire_is_on(struct net *net)
1684{
1685 struct sock *nlsk;
1686 int ret = 0;
1687
1688 rcu_read_lock();
1689 nlsk = rcu_dereference(net->xfrm.nlsk);
1690 if (nlsk)
1691 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1692 rcu_read_unlock();
1693
1694 return ret;
1695}
1696#endif
1697
1698static inline int aead_len(struct xfrm_algo_aead *alg)
1699{
1700 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1701}
1702
1703static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1704{
1705 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1706}
1707
1708static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1709{
1710 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1711}
1712
1713static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1714{
1715 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1716}
1717
1718#ifdef CONFIG_XFRM_MIGRATE
1719static inline int xfrm_replay_clone(struct xfrm_state *x,
1720 struct xfrm_state *orig)
1721{
1722 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1723 GFP_KERNEL);
1724 if (!x->replay_esn)
1725 return -ENOMEM;
1726
1727 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1728 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1729
1730 x->preplay_esn = kmemdup(x->replay_esn,
1731 xfrm_replay_state_esn_len(x->replay_esn),
1732 GFP_KERNEL);
1733 if (!x->preplay_esn) {
1734 kfree(x->replay_esn);
1735 return -ENOMEM;
1736 }
1737
1738 return 0;
1739}
1740
1741static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1742{
1743 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1744}
1745
1746
1747static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1748{
1749 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1750}
1751
1752static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1753{
1754 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1755}
1756
1757static inline void xfrm_states_put(struct xfrm_state **states, int n)
1758{
1759 int i;
1760 for (i = 0; i < n; i++)
1761 xfrm_state_put(*(states + i));
1762}
1763
1764static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1765{
1766 int i;
1767 for (i = 0; i < n; i++)
1768 xfrm_state_delete(*(states + i));
1769}
1770#endif
1771
1772#ifdef CONFIG_XFRM
1773static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1774{
1775 return skb->sp->xvec[skb->sp->len - 1];
1776}
1777#endif
1778
1779static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1780{
1781 if (attrs[XFRMA_MARK])
1782 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1783 else
1784 m->v = m->m = 0;
1785
1786 return m->v & m->m;
1787}
1788
1789static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1790{
1791 int ret = 0;
1792
1793 if (m->m | m->v)
1794 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1795 return ret;
1796}
1797
1798static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1799 unsigned int family)
1800{
1801 bool tunnel = false;
1802
1803 switch(family) {
1804 case AF_INET:
1805 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1806 tunnel = true;
1807 break;
1808 case AF_INET6:
1809 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1810 tunnel = true;
1811 break;
1812 }
1813 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1814 return -EINVAL;
1815
1816 return 0;
1817}
1818#endif /* _NET_XFRM_H */