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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
56extern struct mutex xfrm_cfg_mutex;
57
58/* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 union {
123 u8 dying;
124 u8 proto;
125 };
126 u32 seq;
127};
128
129/* Full description of state of transformer. */
130struct xfrm_state {
131#ifdef CONFIG_NET_NS
132 struct net *xs_net;
133#endif
134 union {
135 struct hlist_node gclist;
136 struct hlist_node bydst;
137 };
138 struct hlist_node bysrc;
139 struct hlist_node byspi;
140
141 atomic_t refcnt;
142 spinlock_t lock;
143
144 struct xfrm_id id;
145 struct xfrm_selector sel;
146 struct xfrm_mark mark;
147 u32 tfcpad;
148
149 u32 genid;
150
151 /* Key manager bits */
152 struct xfrm_state_walk km;
153
154 /* Parameters of this state. */
155 struct {
156 u32 reqid;
157 u8 mode;
158 u8 replay_window;
159 u8 aalgo, ealgo, calgo;
160 u8 flags;
161 u16 family;
162 xfrm_address_t saddr;
163 int header_len;
164 int trailer_len;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo_auth *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189 struct xfrm_replay_state_esn *replay_esn;
190
191 /* Replay detection state at the time we sent the last notification */
192 struct xfrm_replay_state preplay;
193 struct xfrm_replay_state_esn *preplay_esn;
194
195 /* The functions for replay detection. */
196 struct xfrm_replay *repl;
197
198 /* internal flag that only holds state for delayed aevent at the
199 * moment
200 */
201 u32 xflags;
202
203 /* Replay detection notification settings */
204 u32 replay_maxage;
205 u32 replay_maxdiff;
206
207 /* Replay detection notification timer */
208 struct timer_list rtimer;
209
210 /* Statistics */
211 struct xfrm_stats stats;
212
213 struct xfrm_lifetime_cur curlft;
214 struct tasklet_hrtimer mtimer;
215
216 /* Last used time */
217 unsigned long lastused;
218
219 /* Reference to data common to all the instances of this
220 * transformer. */
221 const struct xfrm_type *type;
222 struct xfrm_mode *inner_mode;
223 struct xfrm_mode *inner_mode_iaf;
224 struct xfrm_mode *outer_mode;
225
226 /* Security context */
227 struct xfrm_sec_ctx *security;
228
229 /* Private data of this transformer, format is opaque,
230 * interpreted by xfrm_type methods. */
231 void *data;
232};
233
234static inline struct net *xs_net(struct xfrm_state *x)
235{
236 return read_pnet(&x->xs_net);
237}
238
239/* xflags - make enum if more show up */
240#define XFRM_TIME_DEFER 1
241
242enum {
243 XFRM_STATE_VOID,
244 XFRM_STATE_ACQ,
245 XFRM_STATE_VALID,
246 XFRM_STATE_ERROR,
247 XFRM_STATE_EXPIRED,
248 XFRM_STATE_DEAD
249};
250
251/* callback structure passed from either netlink or pfkey */
252struct km_event {
253 union {
254 u32 hard;
255 u32 proto;
256 u32 byid;
257 u32 aevent;
258 u32 type;
259 } data;
260
261 u32 seq;
262 u32 pid;
263 u32 event;
264 struct net *net;
265};
266
267struct xfrm_replay {
268 void (*advance)(struct xfrm_state *x, __be32 net_seq);
269 int (*check)(struct xfrm_state *x,
270 struct sk_buff *skb,
271 __be32 net_seq);
272 void (*notify)(struct xfrm_state *x, int event);
273 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
274};
275
276struct net_device;
277struct xfrm_type;
278struct xfrm_dst;
279struct xfrm_policy_afinfo {
280 unsigned short family;
281 struct dst_ops *dst_ops;
282 void (*garbage_collect)(struct net *net);
283 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
284 const xfrm_address_t *saddr,
285 const xfrm_address_t *daddr);
286 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
287 void (*decode_session)(struct sk_buff *skb,
288 struct flowi *fl,
289 int reverse);
290 int (*get_tos)(const struct flowi *fl);
291 int (*init_path)(struct xfrm_dst *path,
292 struct dst_entry *dst,
293 int nfheader_len);
294 int (*fill_dst)(struct xfrm_dst *xdst,
295 struct net_device *dev,
296 const struct flowi *fl);
297 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
298};
299
300extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
301extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
302extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
303extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
304
305struct xfrm_tmpl;
306extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
307extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
308extern int __xfrm_state_delete(struct xfrm_state *x);
309
310struct xfrm_state_afinfo {
311 unsigned int family;
312 unsigned int proto;
313 __be16 eth_proto;
314 struct module *owner;
315 const struct xfrm_type *type_map[IPPROTO_MAX];
316 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
317 int (*init_flags)(struct xfrm_state *x);
318 void (*init_tempsel)(struct xfrm_selector *sel,
319 const struct flowi *fl);
320 void (*init_temprop)(struct xfrm_state *x,
321 const struct xfrm_tmpl *tmpl,
322 const xfrm_address_t *daddr,
323 const xfrm_address_t *saddr);
324 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
325 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
326 int (*output)(struct sk_buff *skb);
327 int (*output_finish)(struct sk_buff *skb);
328 int (*extract_input)(struct xfrm_state *x,
329 struct sk_buff *skb);
330 int (*extract_output)(struct xfrm_state *x,
331 struct sk_buff *skb);
332 int (*transport_finish)(struct sk_buff *skb,
333 int async);
334};
335
336extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
337extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
338
339extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
340
341struct xfrm_type {
342 char *description;
343 struct module *owner;
344 u8 proto;
345 u8 flags;
346#define XFRM_TYPE_NON_FRAGMENT 1
347#define XFRM_TYPE_REPLAY_PROT 2
348#define XFRM_TYPE_LOCAL_COADDR 4
349#define XFRM_TYPE_REMOTE_COADDR 8
350
351 int (*init_state)(struct xfrm_state *x);
352 void (*destructor)(struct xfrm_state *);
353 int (*input)(struct xfrm_state *, struct sk_buff *skb);
354 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
355 int (*reject)(struct xfrm_state *, struct sk_buff *,
356 const struct flowi *);
357 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
358 /* Estimate maximal size of result of transformation of a dgram */
359 u32 (*get_mtu)(struct xfrm_state *, int size);
360};
361
362extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
363extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
364
365struct xfrm_mode {
366 /*
367 * Remove encapsulation header.
368 *
369 * The IP header will be moved over the top of the encapsulation
370 * header.
371 *
372 * On entry, the transport header shall point to where the IP header
373 * should be and the network header shall be set to where the IP
374 * header currently is. skb->data shall point to the start of the
375 * payload.
376 */
377 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
378
379 /*
380 * This is the actual input entry point.
381 *
382 * For transport mode and equivalent this would be identical to
383 * input2 (which does not need to be set). While tunnel mode
384 * and equivalent would set this to the tunnel encapsulation function
385 * xfrm4_prepare_input that would in turn call input2.
386 */
387 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
388
389 /*
390 * Add encapsulation header.
391 *
392 * On exit, the transport header will be set to the start of the
393 * encapsulation header to be filled in by x->type->output and
394 * the mac header will be set to the nextheader (protocol for
395 * IPv4) field of the extension header directly preceding the
396 * encapsulation header, or in its absence, that of the top IP
397 * header. The value of the network header will always point
398 * to the top IP header while skb->data will point to the payload.
399 */
400 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
401
402 /*
403 * This is the actual output entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * output2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to a tunnel encapsulation function
408 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
409 * call output2.
410 */
411 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
412
413 struct xfrm_state_afinfo *afinfo;
414 struct module *owner;
415 unsigned int encap;
416 int flags;
417};
418
419/* Flags for xfrm_mode. */
420enum {
421 XFRM_MODE_FLAG_TUNNEL = 1,
422};
423
424extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
425extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
426
427static inline int xfrm_af2proto(unsigned int family)
428{
429 switch(family) {
430 case AF_INET:
431 return IPPROTO_IPIP;
432 case AF_INET6:
433 return IPPROTO_IPV6;
434 default:
435 return 0;
436 }
437}
438
439static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
440{
441 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
442 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
443 return x->inner_mode;
444 else
445 return x->inner_mode_iaf;
446}
447
448struct xfrm_tmpl {
449/* id in template is interpreted as:
450 * daddr - destination of tunnel, may be zero for transport mode.
451 * spi - zero to acquire spi. Not zero if spi is static, then
452 * daddr must be fixed too.
453 * proto - AH/ESP/IPCOMP
454 */
455 struct xfrm_id id;
456
457/* Source address of tunnel. Ignored, if it is not a tunnel. */
458 xfrm_address_t saddr;
459
460 unsigned short encap_family;
461
462 u32 reqid;
463
464/* Mode: transport, tunnel etc. */
465 u8 mode;
466
467/* Sharing mode: unique, this session only, this user only etc. */
468 u8 share;
469
470/* May skip this transfomration if no SA is found */
471 u8 optional;
472
473/* Skip aalgos/ealgos/calgos checks. */
474 u8 allalgs;
475
476/* Bit mask of algos allowed for acquisition */
477 u32 aalgos;
478 u32 ealgos;
479 u32 calgos;
480};
481
482#define XFRM_MAX_DEPTH 6
483
484struct xfrm_policy_walk_entry {
485 struct list_head all;
486 u8 dead;
487};
488
489struct xfrm_policy_walk {
490 struct xfrm_policy_walk_entry walk;
491 u8 type;
492 u32 seq;
493};
494
495struct xfrm_policy {
496#ifdef CONFIG_NET_NS
497 struct net *xp_net;
498#endif
499 struct hlist_node bydst;
500 struct hlist_node byidx;
501
502 /* This lock only affects elements except for entry. */
503 rwlock_t lock;
504 atomic_t refcnt;
505 struct timer_list timer;
506
507 struct flow_cache_object flo;
508 atomic_t genid;
509 u32 priority;
510 u32 index;
511 struct xfrm_mark mark;
512 struct xfrm_selector selector;
513 struct xfrm_lifetime_cfg lft;
514 struct xfrm_lifetime_cur curlft;
515 struct xfrm_policy_walk_entry walk;
516 u8 type;
517 u8 action;
518 u8 flags;
519 u8 xfrm_nr;
520 u16 family;
521 struct xfrm_sec_ctx *security;
522 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
523};
524
525static inline struct net *xp_net(const struct xfrm_policy *xp)
526{
527 return read_pnet(&xp->xp_net);
528}
529
530struct xfrm_kmaddress {
531 xfrm_address_t local;
532 xfrm_address_t remote;
533 u32 reserved;
534 u16 family;
535};
536
537struct xfrm_migrate {
538 xfrm_address_t old_daddr;
539 xfrm_address_t old_saddr;
540 xfrm_address_t new_daddr;
541 xfrm_address_t new_saddr;
542 u8 proto;
543 u8 mode;
544 u16 reserved;
545 u32 reqid;
546 u16 old_family;
547 u16 new_family;
548};
549
550#define XFRM_KM_TIMEOUT 30
551/* which seqno */
552#define XFRM_REPLAY_SEQ 1
553#define XFRM_REPLAY_OSEQ 2
554#define XFRM_REPLAY_SEQ_MASK 3
555/* what happened */
556#define XFRM_REPLAY_UPDATE XFRM_AE_CR
557#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
558
559/* default aevent timeout in units of 100ms */
560#define XFRM_AE_ETIME 10
561/* Async Event timer multiplier */
562#define XFRM_AE_ETH_M 10
563/* default seq threshold size */
564#define XFRM_AE_SEQT_SIZE 2
565
566struct xfrm_mgr {
567 struct list_head list;
568 char *id;
569 int (*notify)(struct xfrm_state *x, const struct km_event *c);
570 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
571 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
572 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
573 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
574 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
575 int (*migrate)(const struct xfrm_selector *sel,
576 u8 dir, u8 type,
577 const struct xfrm_migrate *m,
578 int num_bundles,
579 const struct xfrm_kmaddress *k);
580};
581
582extern int xfrm_register_km(struct xfrm_mgr *km);
583extern int xfrm_unregister_km(struct xfrm_mgr *km);
584
585/*
586 * This structure is used for the duration where packets are being
587 * transformed by IPsec. As soon as the packet leaves IPsec the
588 * area beyond the generic IP part may be overwritten.
589 */
590struct xfrm_skb_cb {
591 union {
592 struct inet_skb_parm h4;
593 struct inet6_skb_parm h6;
594 } header;
595
596 /* Sequence number for replay protection. */
597 union {
598 struct {
599 __u32 low;
600 __u32 hi;
601 } output;
602 struct {
603 __be32 low;
604 __be32 hi;
605 } input;
606 } seq;
607};
608
609#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
610
611/*
612 * This structure is used by the afinfo prepare_input/prepare_output functions
613 * to transmit header information to the mode input/output functions.
614 */
615struct xfrm_mode_skb_cb {
616 union {
617 struct inet_skb_parm h4;
618 struct inet6_skb_parm h6;
619 } header;
620
621 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
622 __be16 id;
623 __be16 frag_off;
624
625 /* IP header length (excluding options or extension headers). */
626 u8 ihl;
627
628 /* TOS for IPv4, class for IPv6. */
629 u8 tos;
630
631 /* TTL for IPv4, hop limitfor IPv6. */
632 u8 ttl;
633
634 /* Protocol for IPv4, NH for IPv6. */
635 u8 protocol;
636
637 /* Option length for IPv4, zero for IPv6. */
638 u8 optlen;
639
640 /* Used by IPv6 only, zero for IPv4. */
641 u8 flow_lbl[3];
642};
643
644#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
645
646/*
647 * This structure is used by the input processing to locate the SPI and
648 * related information.
649 */
650struct xfrm_spi_skb_cb {
651 union {
652 struct inet_skb_parm h4;
653 struct inet6_skb_parm h6;
654 } header;
655
656 unsigned int daddroff;
657 unsigned int family;
658};
659
660#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
661
662/* Audit Information */
663struct xfrm_audit {
664 u32 secid;
665 uid_t loginuid;
666 u32 sessionid;
667};
668
669#ifdef CONFIG_AUDITSYSCALL
670static inline struct audit_buffer *xfrm_audit_start(const char *op)
671{
672 struct audit_buffer *audit_buf = NULL;
673
674 if (audit_enabled == 0)
675 return NULL;
676 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
677 AUDIT_MAC_IPSEC_EVENT);
678 if (audit_buf == NULL)
679 return NULL;
680 audit_log_format(audit_buf, "op=%s", op);
681 return audit_buf;
682}
683
684static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
685 struct audit_buffer *audit_buf)
686{
687 char *secctx;
688 u32 secctx_len;
689
690 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
691 if (secid != 0 &&
692 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
693 audit_log_format(audit_buf, " subj=%s", secctx);
694 security_release_secctx(secctx, secctx_len);
695 } else
696 audit_log_task_context(audit_buf);
697}
698
699extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
700 u32 auid, u32 ses, u32 secid);
701extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
702 u32 auid, u32 ses, u32 secid);
703extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
704 u32 auid, u32 ses, u32 secid);
705extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
706 u32 auid, u32 ses, u32 secid);
707extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
708 struct sk_buff *skb);
709extern void xfrm_audit_state_replay(struct xfrm_state *x,
710 struct sk_buff *skb, __be32 net_seq);
711extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
712extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
713 __be32 net_spi, __be32 net_seq);
714extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
715 struct sk_buff *skb, u8 proto);
716#else
717
718static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
719 u32 auid, u32 ses, u32 secid)
720{
721}
722
723static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
724 u32 auid, u32 ses, u32 secid)
725{
726}
727
728static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
729 u32 auid, u32 ses, u32 secid)
730{
731}
732
733static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
734 u32 auid, u32 ses, u32 secid)
735{
736}
737
738static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
739 struct sk_buff *skb)
740{
741}
742
743static inline void xfrm_audit_state_replay(struct xfrm_state *x,
744 struct sk_buff *skb, __be32 net_seq)
745{
746}
747
748static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
749 u16 family)
750{
751}
752
753static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
754 __be32 net_spi, __be32 net_seq)
755{
756}
757
758static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
759 struct sk_buff *skb, u8 proto)
760{
761}
762#endif /* CONFIG_AUDITSYSCALL */
763
764static inline void xfrm_pol_hold(struct xfrm_policy *policy)
765{
766 if (likely(policy != NULL))
767 atomic_inc(&policy->refcnt);
768}
769
770extern void xfrm_policy_destroy(struct xfrm_policy *policy);
771
772static inline void xfrm_pol_put(struct xfrm_policy *policy)
773{
774 if (atomic_dec_and_test(&policy->refcnt))
775 xfrm_policy_destroy(policy);
776}
777
778static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
779{
780 int i;
781 for (i = npols - 1; i >= 0; --i)
782 xfrm_pol_put(pols[i]);
783}
784
785extern void __xfrm_state_destroy(struct xfrm_state *);
786
787static inline void __xfrm_state_put(struct xfrm_state *x)
788{
789 atomic_dec(&x->refcnt);
790}
791
792static inline void xfrm_state_put(struct xfrm_state *x)
793{
794 if (atomic_dec_and_test(&x->refcnt))
795 __xfrm_state_destroy(x);
796}
797
798static inline void xfrm_state_hold(struct xfrm_state *x)
799{
800 atomic_inc(&x->refcnt);
801}
802
803static inline bool addr_match(const void *token1, const void *token2,
804 int prefixlen)
805{
806 const __be32 *a1 = token1;
807 const __be32 *a2 = token2;
808 int pdw;
809 int pbi;
810
811 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
812 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
813
814 if (pdw)
815 if (memcmp(a1, a2, pdw << 2))
816 return false;
817
818 if (pbi) {
819 __be32 mask;
820
821 mask = htonl((0xffffffff) << (32 - pbi));
822
823 if ((a1[pdw] ^ a2[pdw]) & mask)
824 return false;
825 }
826
827 return true;
828}
829
830static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
831{
832 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
833 if (prefixlen == 0)
834 return true;
835 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
836}
837
838static __inline__
839__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
840{
841 __be16 port;
842 switch(fl->flowi_proto) {
843 case IPPROTO_TCP:
844 case IPPROTO_UDP:
845 case IPPROTO_UDPLITE:
846 case IPPROTO_SCTP:
847 port = uli->ports.sport;
848 break;
849 case IPPROTO_ICMP:
850 case IPPROTO_ICMPV6:
851 port = htons(uli->icmpt.type);
852 break;
853 case IPPROTO_MH:
854 port = htons(uli->mht.type);
855 break;
856 case IPPROTO_GRE:
857 port = htons(ntohl(uli->gre_key) >> 16);
858 break;
859 default:
860 port = 0; /*XXX*/
861 }
862 return port;
863}
864
865static __inline__
866__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
867{
868 __be16 port;
869 switch(fl->flowi_proto) {
870 case IPPROTO_TCP:
871 case IPPROTO_UDP:
872 case IPPROTO_UDPLITE:
873 case IPPROTO_SCTP:
874 port = uli->ports.dport;
875 break;
876 case IPPROTO_ICMP:
877 case IPPROTO_ICMPV6:
878 port = htons(uli->icmpt.code);
879 break;
880 case IPPROTO_GRE:
881 port = htons(ntohl(uli->gre_key) & 0xffff);
882 break;
883 default:
884 port = 0; /*XXX*/
885 }
886 return port;
887}
888
889extern bool xfrm_selector_match(const struct xfrm_selector *sel,
890 const struct flowi *fl,
891 unsigned short family);
892
893#ifdef CONFIG_SECURITY_NETWORK_XFRM
894/* If neither has a context --> match
895 * Otherwise, both must have a context and the sids, doi, alg must match
896 */
897static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
898{
899 return ((!s1 && !s2) ||
900 (s1 && s2 &&
901 (s1->ctx_sid == s2->ctx_sid) &&
902 (s1->ctx_doi == s2->ctx_doi) &&
903 (s1->ctx_alg == s2->ctx_alg)));
904}
905#else
906static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
907{
908 return true;
909}
910#endif
911
912/* A struct encoding bundle of transformations to apply to some set of flow.
913 *
914 * dst->child points to the next element of bundle.
915 * dst->xfrm points to an instanse of transformer.
916 *
917 * Due to unfortunate limitations of current routing cache, which we
918 * have no time to fix, it mirrors struct rtable and bound to the same
919 * routing key, including saddr,daddr. However, we can have many of
920 * bundles differing by session id. All the bundles grow from a parent
921 * policy rule.
922 */
923struct xfrm_dst {
924 union {
925 struct dst_entry dst;
926 struct rtable rt;
927 struct rt6_info rt6;
928 } u;
929 struct dst_entry *route;
930 struct flow_cache_object flo;
931 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
932 int num_pols, num_xfrms;
933#ifdef CONFIG_XFRM_SUB_POLICY
934 struct flowi *origin;
935 struct xfrm_selector *partner;
936#endif
937 u32 xfrm_genid;
938 u32 policy_genid;
939 u32 route_mtu_cached;
940 u32 child_mtu_cached;
941 u32 route_cookie;
942 u32 path_cookie;
943};
944
945#ifdef CONFIG_XFRM
946static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
947{
948 xfrm_pols_put(xdst->pols, xdst->num_pols);
949 dst_release(xdst->route);
950 if (likely(xdst->u.dst.xfrm))
951 xfrm_state_put(xdst->u.dst.xfrm);
952#ifdef CONFIG_XFRM_SUB_POLICY
953 kfree(xdst->origin);
954 xdst->origin = NULL;
955 kfree(xdst->partner);
956 xdst->partner = NULL;
957#endif
958}
959#endif
960
961extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
962
963struct sec_path {
964 atomic_t refcnt;
965 int len;
966 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
967};
968
969static inline int secpath_exists(struct sk_buff *skb)
970{
971#ifdef CONFIG_XFRM
972 return skb->sp != NULL;
973#else
974 return 0;
975#endif
976}
977
978static inline struct sec_path *
979secpath_get(struct sec_path *sp)
980{
981 if (sp)
982 atomic_inc(&sp->refcnt);
983 return sp;
984}
985
986extern void __secpath_destroy(struct sec_path *sp);
987
988static inline void
989secpath_put(struct sec_path *sp)
990{
991 if (sp && atomic_dec_and_test(&sp->refcnt))
992 __secpath_destroy(sp);
993}
994
995extern struct sec_path *secpath_dup(struct sec_path *src);
996
997static inline void
998secpath_reset(struct sk_buff *skb)
999{
1000#ifdef CONFIG_XFRM
1001 secpath_put(skb->sp);
1002 skb->sp = NULL;
1003#endif
1004}
1005
1006static inline int
1007xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1008{
1009 switch (family) {
1010 case AF_INET:
1011 return addr->a4 == 0;
1012 case AF_INET6:
1013 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1014 }
1015 return 0;
1016}
1017
1018static inline int
1019__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1020{
1021 return (tmpl->saddr.a4 &&
1022 tmpl->saddr.a4 != x->props.saddr.a4);
1023}
1024
1025static inline int
1026__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1027{
1028 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1029 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1030}
1031
1032static inline int
1033xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1034{
1035 switch (family) {
1036 case AF_INET:
1037 return __xfrm4_state_addr_cmp(tmpl, x);
1038 case AF_INET6:
1039 return __xfrm6_state_addr_cmp(tmpl, x);
1040 }
1041 return !0;
1042}
1043
1044#ifdef CONFIG_XFRM
1045extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1046
1047static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1048 struct sk_buff *skb,
1049 unsigned int family, int reverse)
1050{
1051 struct net *net = dev_net(skb->dev);
1052 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1053
1054 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1055 return __xfrm_policy_check(sk, ndir, skb, family);
1056
1057 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1058 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1059 __xfrm_policy_check(sk, ndir, skb, family);
1060}
1061
1062static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1063{
1064 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1065}
1066
1067static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1068{
1069 return xfrm_policy_check(sk, dir, skb, AF_INET);
1070}
1071
1072static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1073{
1074 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1075}
1076
1077static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1078 struct sk_buff *skb)
1079{
1080 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1081}
1082
1083static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1084 struct sk_buff *skb)
1085{
1086 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1087}
1088
1089extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1090 unsigned int family, int reverse);
1091
1092static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1093 unsigned int family)
1094{
1095 return __xfrm_decode_session(skb, fl, family, 0);
1096}
1097
1098static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1099 struct flowi *fl,
1100 unsigned int family)
1101{
1102 return __xfrm_decode_session(skb, fl, family, 1);
1103}
1104
1105extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1106
1107static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1108{
1109 struct net *net = dev_net(skb->dev);
1110
1111 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1112 (skb_dst(skb)->flags & DST_NOXFRM) ||
1113 __xfrm_route_forward(skb, family);
1114}
1115
1116static inline int xfrm4_route_forward(struct sk_buff *skb)
1117{
1118 return xfrm_route_forward(skb, AF_INET);
1119}
1120
1121static inline int xfrm6_route_forward(struct sk_buff *skb)
1122{
1123 return xfrm_route_forward(skb, AF_INET6);
1124}
1125
1126extern int __xfrm_sk_clone_policy(struct sock *sk);
1127
1128static inline int xfrm_sk_clone_policy(struct sock *sk)
1129{
1130 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1131 return __xfrm_sk_clone_policy(sk);
1132 return 0;
1133}
1134
1135extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1136
1137static inline void xfrm_sk_free_policy(struct sock *sk)
1138{
1139 if (unlikely(sk->sk_policy[0] != NULL)) {
1140 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1141 sk->sk_policy[0] = NULL;
1142 }
1143 if (unlikely(sk->sk_policy[1] != NULL)) {
1144 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1145 sk->sk_policy[1] = NULL;
1146 }
1147}
1148
1149#else
1150
1151static inline void xfrm_sk_free_policy(struct sock *sk) {}
1152static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1153static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1154static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1155static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1156{
1157 return 1;
1158}
1159static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1160{
1161 return 1;
1162}
1163static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1164{
1165 return 1;
1166}
1167static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1168 struct flowi *fl,
1169 unsigned int family)
1170{
1171 return -ENOSYS;
1172}
1173static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1174 struct sk_buff *skb)
1175{
1176 return 1;
1177}
1178static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1179 struct sk_buff *skb)
1180{
1181 return 1;
1182}
1183#endif
1184
1185static __inline__
1186xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1187{
1188 switch (family){
1189 case AF_INET:
1190 return (xfrm_address_t *)&fl->u.ip4.daddr;
1191 case AF_INET6:
1192 return (xfrm_address_t *)&fl->u.ip6.daddr;
1193 }
1194 return NULL;
1195}
1196
1197static __inline__
1198xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1199{
1200 switch (family){
1201 case AF_INET:
1202 return (xfrm_address_t *)&fl->u.ip4.saddr;
1203 case AF_INET6:
1204 return (xfrm_address_t *)&fl->u.ip6.saddr;
1205 }
1206 return NULL;
1207}
1208
1209static __inline__
1210void xfrm_flowi_addr_get(const struct flowi *fl,
1211 xfrm_address_t *saddr, xfrm_address_t *daddr,
1212 unsigned short family)
1213{
1214 switch(family) {
1215 case AF_INET:
1216 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1217 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1218 break;
1219 case AF_INET6:
1220 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1221 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1222 break;
1223 }
1224}
1225
1226static __inline__ int
1227__xfrm4_state_addr_check(const struct xfrm_state *x,
1228 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1229{
1230 if (daddr->a4 == x->id.daddr.a4 &&
1231 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1232 return 1;
1233 return 0;
1234}
1235
1236static __inline__ int
1237__xfrm6_state_addr_check(const struct xfrm_state *x,
1238 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1239{
1240 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1241 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1242 ipv6_addr_any((struct in6_addr *)saddr) ||
1243 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1244 return 1;
1245 return 0;
1246}
1247
1248static __inline__ int
1249xfrm_state_addr_check(const struct xfrm_state *x,
1250 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1251 unsigned short family)
1252{
1253 switch (family) {
1254 case AF_INET:
1255 return __xfrm4_state_addr_check(x, daddr, saddr);
1256 case AF_INET6:
1257 return __xfrm6_state_addr_check(x, daddr, saddr);
1258 }
1259 return 0;
1260}
1261
1262static __inline__ int
1263xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1264 unsigned short family)
1265{
1266 switch (family) {
1267 case AF_INET:
1268 return __xfrm4_state_addr_check(x,
1269 (const xfrm_address_t *)&fl->u.ip4.daddr,
1270 (const xfrm_address_t *)&fl->u.ip4.saddr);
1271 case AF_INET6:
1272 return __xfrm6_state_addr_check(x,
1273 (const xfrm_address_t *)&fl->u.ip6.daddr,
1274 (const xfrm_address_t *)&fl->u.ip6.saddr);
1275 }
1276 return 0;
1277}
1278
1279static inline int xfrm_state_kern(const struct xfrm_state *x)
1280{
1281 return atomic_read(&x->tunnel_users);
1282}
1283
1284static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1285{
1286 return (!userproto || proto == userproto ||
1287 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1288 proto == IPPROTO_ESP ||
1289 proto == IPPROTO_COMP)));
1290}
1291
1292/*
1293 * xfrm algorithm information
1294 */
1295struct xfrm_algo_aead_info {
1296 u16 icv_truncbits;
1297};
1298
1299struct xfrm_algo_auth_info {
1300 u16 icv_truncbits;
1301 u16 icv_fullbits;
1302};
1303
1304struct xfrm_algo_encr_info {
1305 u16 blockbits;
1306 u16 defkeybits;
1307};
1308
1309struct xfrm_algo_comp_info {
1310 u16 threshold;
1311};
1312
1313struct xfrm_algo_desc {
1314 char *name;
1315 char *compat;
1316 u8 available:1;
1317 union {
1318 struct xfrm_algo_aead_info aead;
1319 struct xfrm_algo_auth_info auth;
1320 struct xfrm_algo_encr_info encr;
1321 struct xfrm_algo_comp_info comp;
1322 } uinfo;
1323 struct sadb_alg desc;
1324};
1325
1326/* XFRM tunnel handlers. */
1327struct xfrm_tunnel {
1328 int (*handler)(struct sk_buff *skb);
1329 int (*err_handler)(struct sk_buff *skb, u32 info);
1330
1331 struct xfrm_tunnel __rcu *next;
1332 int priority;
1333};
1334
1335struct xfrm6_tunnel {
1336 int (*handler)(struct sk_buff *skb);
1337 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1338 u8 type, u8 code, int offset, __be32 info);
1339 struct xfrm6_tunnel __rcu *next;
1340 int priority;
1341};
1342
1343extern void xfrm_init(void);
1344extern void xfrm4_init(int rt_hash_size);
1345extern int xfrm_state_init(struct net *net);
1346extern void xfrm_state_fini(struct net *net);
1347extern void xfrm4_state_init(void);
1348#ifdef CONFIG_XFRM
1349extern int xfrm6_init(void);
1350extern void xfrm6_fini(void);
1351extern int xfrm6_state_init(void);
1352extern void xfrm6_state_fini(void);
1353#else
1354static inline int xfrm6_init(void)
1355{
1356 return 0;
1357}
1358static inline void xfrm6_fini(void)
1359{
1360 ;
1361}
1362#endif
1363
1364#ifdef CONFIG_XFRM_STATISTICS
1365extern int xfrm_proc_init(struct net *net);
1366extern void xfrm_proc_fini(struct net *net);
1367#endif
1368
1369extern int xfrm_sysctl_init(struct net *net);
1370#ifdef CONFIG_SYSCTL
1371extern void xfrm_sysctl_fini(struct net *net);
1372#else
1373static inline void xfrm_sysctl_fini(struct net *net)
1374{
1375}
1376#endif
1377
1378extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1379extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1380 int (*func)(struct xfrm_state *, int, void*), void *);
1381extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1382extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1383extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1384 const xfrm_address_t *saddr,
1385 const struct flowi *fl,
1386 struct xfrm_tmpl *tmpl,
1387 struct xfrm_policy *pol, int *err,
1388 unsigned short family);
1389extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1390 xfrm_address_t *daddr,
1391 xfrm_address_t *saddr,
1392 unsigned short family,
1393 u8 mode, u8 proto, u32 reqid);
1394extern int xfrm_state_check_expire(struct xfrm_state *x);
1395extern void xfrm_state_insert(struct xfrm_state *x);
1396extern int xfrm_state_add(struct xfrm_state *x);
1397extern int xfrm_state_update(struct xfrm_state *x);
1398extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1399 const xfrm_address_t *daddr, __be32 spi,
1400 u8 proto, unsigned short family);
1401extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1402 const xfrm_address_t *daddr,
1403 const xfrm_address_t *saddr,
1404 u8 proto,
1405 unsigned short family);
1406#ifdef CONFIG_XFRM_SUB_POLICY
1407extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1408 int n, unsigned short family);
1409extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1410 int n, unsigned short family);
1411#else
1412static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1413 int n, unsigned short family)
1414{
1415 return -ENOSYS;
1416}
1417
1418static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1419 int n, unsigned short family)
1420{
1421 return -ENOSYS;
1422}
1423#endif
1424
1425struct xfrmk_sadinfo {
1426 u32 sadhcnt; /* current hash bkts */
1427 u32 sadhmcnt; /* max allowed hash bkts */
1428 u32 sadcnt; /* current running count */
1429};
1430
1431struct xfrmk_spdinfo {
1432 u32 incnt;
1433 u32 outcnt;
1434 u32 fwdcnt;
1435 u32 inscnt;
1436 u32 outscnt;
1437 u32 fwdscnt;
1438 u32 spdhcnt;
1439 u32 spdhmcnt;
1440};
1441
1442extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1443 u32 seq);
1444extern int xfrm_state_delete(struct xfrm_state *x);
1445extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1446extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1447extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1448extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1449extern int xfrm_init_replay(struct xfrm_state *x);
1450extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1451extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1452extern int xfrm_init_state(struct xfrm_state *x);
1453extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1454extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1455 int encap_type);
1456extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1457extern int xfrm_output_resume(struct sk_buff *skb, int err);
1458extern int xfrm_output(struct sk_buff *skb);
1459extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1460extern int xfrm4_extract_header(struct sk_buff *skb);
1461extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1462extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1463 int encap_type);
1464extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1465extern int xfrm4_rcv(struct sk_buff *skb);
1466
1467static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1468{
1469 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1470}
1471
1472extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1473extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1474extern int xfrm4_output(struct sk_buff *skb);
1475extern int xfrm4_output_finish(struct sk_buff *skb);
1476extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1477extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1478extern int xfrm6_extract_header(struct sk_buff *skb);
1479extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1480extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1481extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1482extern int xfrm6_rcv(struct sk_buff *skb);
1483extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1484 xfrm_address_t *saddr, u8 proto);
1485extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1486extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1487extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1488extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1489extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1490extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1491extern int xfrm6_output(struct sk_buff *skb);
1492extern int xfrm6_output_finish(struct sk_buff *skb);
1493extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1494 u8 **prevhdr);
1495
1496#ifdef CONFIG_XFRM
1497extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1498extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1499#else
1500static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1501{
1502 return -ENOPROTOOPT;
1503}
1504
1505static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1506{
1507 /* should not happen */
1508 kfree_skb(skb);
1509 return 0;
1510}
1511#endif
1512
1513struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1514
1515extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1516extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1517 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1518extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1519int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1520struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1521 u8 type, int dir,
1522 struct xfrm_selector *sel,
1523 struct xfrm_sec_ctx *ctx, int delete,
1524 int *err);
1525struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1526int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1527u32 xfrm_get_acqseq(void);
1528extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1529struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1530 u8 mode, u32 reqid, u8 proto,
1531 const xfrm_address_t *daddr,
1532 const xfrm_address_t *saddr, int create,
1533 unsigned short family);
1534extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1535
1536#ifdef CONFIG_XFRM_MIGRATE
1537extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1538 const struct xfrm_migrate *m, int num_bundles,
1539 const struct xfrm_kmaddress *k);
1540extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1541extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1542 struct xfrm_migrate *m);
1543extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1544 struct xfrm_migrate *m, int num_bundles,
1545 struct xfrm_kmaddress *k);
1546#endif
1547
1548extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1549extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1550extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1551
1552extern void xfrm_input_init(void);
1553extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1554
1555extern void xfrm_probe_algs(void);
1556extern int xfrm_count_auth_supported(void);
1557extern int xfrm_count_enc_supported(void);
1558extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1559extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1560extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1561extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1562extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1563extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1564extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1565extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1566extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1567 int probe);
1568
1569static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1570 const xfrm_address_t *b,
1571 int family)
1572{
1573 switch (family) {
1574 default:
1575 case AF_INET:
1576 return (__force u32)a->a4 - (__force u32)b->a4;
1577 case AF_INET6:
1578 return ipv6_addr_cmp((const struct in6_addr *)a,
1579 (const struct in6_addr *)b);
1580 }
1581}
1582
1583static inline int xfrm_policy_id2dir(u32 index)
1584{
1585 return index & 7;
1586}
1587
1588#ifdef CONFIG_XFRM
1589static inline int xfrm_aevent_is_on(struct net *net)
1590{
1591 struct sock *nlsk;
1592 int ret = 0;
1593
1594 rcu_read_lock();
1595 nlsk = rcu_dereference(net->xfrm.nlsk);
1596 if (nlsk)
1597 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1598 rcu_read_unlock();
1599 return ret;
1600}
1601#endif
1602
1603static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1604{
1605 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1606}
1607
1608static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1609{
1610 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1611}
1612
1613static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1614{
1615 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1616}
1617
1618#ifdef CONFIG_XFRM_MIGRATE
1619static inline int xfrm_replay_clone(struct xfrm_state *x,
1620 struct xfrm_state *orig)
1621{
1622 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1623 GFP_KERNEL);
1624 if (!x->replay_esn)
1625 return -ENOMEM;
1626
1627 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1628 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1629
1630 x->preplay_esn = kmemdup(x->replay_esn,
1631 xfrm_replay_state_esn_len(x->replay_esn),
1632 GFP_KERNEL);
1633 if (!x->preplay_esn) {
1634 kfree(x->replay_esn);
1635 return -ENOMEM;
1636 }
1637
1638 return 0;
1639}
1640
1641static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1642{
1643 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1644}
1645
1646static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1647{
1648 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1649}
1650
1651static inline void xfrm_states_put(struct xfrm_state **states, int n)
1652{
1653 int i;
1654 for (i = 0; i < n; i++)
1655 xfrm_state_put(*(states + i));
1656}
1657
1658static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1659{
1660 int i;
1661 for (i = 0; i < n; i++)
1662 xfrm_state_delete(*(states + i));
1663}
1664#endif
1665
1666#ifdef CONFIG_XFRM
1667static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1668{
1669 return skb->sp->xvec[skb->sp->len - 1];
1670}
1671#endif
1672
1673static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1674{
1675 if (attrs[XFRMA_MARK])
1676 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1677 else
1678 m->v = m->m = 0;
1679
1680 return m->v & m->m;
1681}
1682
1683static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1684{
1685 if ((m->m | m->v) &&
1686 nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m))
1687 goto nla_put_failure;
1688 return 0;
1689
1690nla_put_failure:
1691 return -1;
1692}
1693
1694#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#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#ifdef CONFIG_NET_NS
130 struct net *xs_net;
131#endif
132 union {
133 struct hlist_node gclist;
134 struct hlist_node bydst;
135 };
136 struct hlist_node bysrc;
137 struct hlist_node byspi;
138
139 atomic_t refcnt;
140 spinlock_t lock;
141
142 struct xfrm_id id;
143 struct xfrm_selector sel;
144 struct xfrm_mark mark;
145 u32 tfcpad;
146
147 u32 genid;
148
149 /* Key manager bits */
150 struct xfrm_state_walk km;
151
152 /* Parameters of this state. */
153 struct {
154 u32 reqid;
155 u8 mode;
156 u8 replay_window;
157 u8 aalgo, ealgo, calgo;
158 u8 flags;
159 u16 family;
160 xfrm_address_t saddr;
161 int header_len;
162 int trailer_len;
163 u32 extra_flags;
164 } props;
165
166 struct xfrm_lifetime_cfg lft;
167
168 /* Data for transformer */
169 struct xfrm_algo_auth *aalg;
170 struct xfrm_algo *ealg;
171 struct xfrm_algo *calg;
172 struct xfrm_algo_aead *aead;
173
174 /* Data for encapsulator */
175 struct xfrm_encap_tmpl *encap;
176
177 /* Data for care-of address */
178 xfrm_address_t *coaddr;
179
180 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
181 struct xfrm_state *tunnel;
182
183 /* If a tunnel, number of users + 1 */
184 atomic_t tunnel_users;
185
186 /* State for replay detection */
187 struct xfrm_replay_state replay;
188 struct xfrm_replay_state_esn *replay_esn;
189
190 /* Replay detection state at the time we sent the last notification */
191 struct xfrm_replay_state preplay;
192 struct xfrm_replay_state_esn *preplay_esn;
193
194 /* The functions for replay detection. */
195 struct xfrm_replay *repl;
196
197 /* internal flag that only holds state for delayed aevent at the
198 * moment
199 */
200 u32 xflags;
201
202 /* Replay detection notification settings */
203 u32 replay_maxage;
204 u32 replay_maxdiff;
205
206 /* Replay detection notification timer */
207 struct timer_list rtimer;
208
209 /* Statistics */
210 struct xfrm_stats stats;
211
212 struct xfrm_lifetime_cur curlft;
213 struct tasklet_hrtimer mtimer;
214
215 /* used to fix curlft->add_time when changing date */
216 long saved_tmo;
217
218 /* Last used time */
219 unsigned long lastused;
220
221 /* Reference to data common to all the instances of this
222 * transformer. */
223 const struct xfrm_type *type;
224 struct xfrm_mode *inner_mode;
225 struct xfrm_mode *inner_mode_iaf;
226 struct xfrm_mode *outer_mode;
227
228 /* Security context */
229 struct xfrm_sec_ctx *security;
230
231 /* Private data of this transformer, format is opaque,
232 * interpreted by xfrm_type methods. */
233 void *data;
234};
235
236static inline struct net *xs_net(struct xfrm_state *x)
237{
238 return read_pnet(&x->xs_net);
239}
240
241/* xflags - make enum if more show up */
242#define XFRM_TIME_DEFER 1
243#define XFRM_SOFT_EXPIRE 2
244
245enum {
246 XFRM_STATE_VOID,
247 XFRM_STATE_ACQ,
248 XFRM_STATE_VALID,
249 XFRM_STATE_ERROR,
250 XFRM_STATE_EXPIRED,
251 XFRM_STATE_DEAD
252};
253
254/* callback structure passed from either netlink or pfkey */
255struct km_event {
256 union {
257 u32 hard;
258 u32 proto;
259 u32 byid;
260 u32 aevent;
261 u32 type;
262 } data;
263
264 u32 seq;
265 u32 portid;
266 u32 event;
267 struct net *net;
268};
269
270struct xfrm_replay {
271 void (*advance)(struct xfrm_state *x, __be32 net_seq);
272 int (*check)(struct xfrm_state *x,
273 struct sk_buff *skb,
274 __be32 net_seq);
275 int (*recheck)(struct xfrm_state *x,
276 struct sk_buff *skb,
277 __be32 net_seq);
278 void (*notify)(struct xfrm_state *x, int event);
279 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
280};
281
282struct net_device;
283struct xfrm_type;
284struct xfrm_dst;
285struct xfrm_policy_afinfo {
286 unsigned short family;
287 struct dst_ops *dst_ops;
288 void (*garbage_collect)(struct net *net);
289 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
290 const xfrm_address_t *saddr,
291 const xfrm_address_t *daddr);
292 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
293 void (*decode_session)(struct sk_buff *skb,
294 struct flowi *fl,
295 int reverse);
296 int (*get_tos)(const struct flowi *fl);
297 void (*init_dst)(struct net *net,
298 struct xfrm_dst *dst);
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 sock *sk, struct sk_buff *skb);
337 int (*output_finish)(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#ifdef CONFIG_NET_NS
526 struct net *xp_net;
527#endif
528 struct hlist_node bydst;
529 struct hlist_node byidx;
530
531 /* This lock only affects elements except for entry. */
532 rwlock_t lock;
533 atomic_t refcnt;
534 struct timer_list timer;
535
536 struct flow_cache_object flo;
537 atomic_t genid;
538 u32 priority;
539 u32 index;
540 struct xfrm_mark mark;
541 struct xfrm_selector selector;
542 struct xfrm_lifetime_cfg lft;
543 struct xfrm_lifetime_cur curlft;
544 struct xfrm_policy_walk_entry walk;
545 struct xfrm_policy_queue polq;
546 u8 type;
547 u8 action;
548 u8 flags;
549 u8 xfrm_nr;
550 u16 family;
551 struct xfrm_sec_ctx *security;
552 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
553};
554
555static inline struct net *xp_net(const struct xfrm_policy *xp)
556{
557 return read_pnet(&xp->xp_net);
558}
559
560struct xfrm_kmaddress {
561 xfrm_address_t local;
562 xfrm_address_t remote;
563 u32 reserved;
564 u16 family;
565};
566
567struct xfrm_migrate {
568 xfrm_address_t old_daddr;
569 xfrm_address_t old_saddr;
570 xfrm_address_t new_daddr;
571 xfrm_address_t new_saddr;
572 u8 proto;
573 u8 mode;
574 u16 reserved;
575 u32 reqid;
576 u16 old_family;
577 u16 new_family;
578};
579
580#define XFRM_KM_TIMEOUT 30
581/* what happened */
582#define XFRM_REPLAY_UPDATE XFRM_AE_CR
583#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
584
585/* default aevent timeout in units of 100ms */
586#define XFRM_AE_ETIME 10
587/* Async Event timer multiplier */
588#define XFRM_AE_ETH_M 10
589/* default seq threshold size */
590#define XFRM_AE_SEQT_SIZE 2
591
592struct xfrm_mgr {
593 struct list_head list;
594 char *id;
595 int (*notify)(struct xfrm_state *x, const struct km_event *c);
596 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
597 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
598 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
599 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
600 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
601 int (*migrate)(const struct xfrm_selector *sel,
602 u8 dir, u8 type,
603 const struct xfrm_migrate *m,
604 int num_bundles,
605 const struct xfrm_kmaddress *k);
606 bool (*is_alive)(const struct km_event *c);
607};
608
609int xfrm_register_km(struct xfrm_mgr *km);
610int xfrm_unregister_km(struct xfrm_mgr *km);
611
612struct xfrm_tunnel_skb_cb {
613 union {
614 struct inet_skb_parm h4;
615 struct inet6_skb_parm h6;
616 } header;
617
618 union {
619 struct ip_tunnel *ip4;
620 struct ip6_tnl *ip6;
621 } tunnel;
622};
623
624#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
625
626/*
627 * This structure is used for the duration where packets are being
628 * transformed by IPsec. As soon as the packet leaves IPsec the
629 * area beyond the generic IP part may be overwritten.
630 */
631struct xfrm_skb_cb {
632 struct xfrm_tunnel_skb_cb header;
633
634 /* Sequence number for replay protection. */
635 union {
636 struct {
637 __u32 low;
638 __u32 hi;
639 } output;
640 struct {
641 __be32 low;
642 __be32 hi;
643 } input;
644 } seq;
645};
646
647#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
648
649/*
650 * This structure is used by the afinfo prepare_input/prepare_output functions
651 * to transmit header information to the mode input/output functions.
652 */
653struct xfrm_mode_skb_cb {
654 struct xfrm_tunnel_skb_cb header;
655
656 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
657 __be16 id;
658 __be16 frag_off;
659
660 /* IP header length (excluding options or extension headers). */
661 u8 ihl;
662
663 /* TOS for IPv4, class for IPv6. */
664 u8 tos;
665
666 /* TTL for IPv4, hop limitfor IPv6. */
667 u8 ttl;
668
669 /* Protocol for IPv4, NH for IPv6. */
670 u8 protocol;
671
672 /* Option length for IPv4, zero for IPv6. */
673 u8 optlen;
674
675 /* Used by IPv6 only, zero for IPv4. */
676 u8 flow_lbl[3];
677};
678
679#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
680
681/*
682 * This structure is used by the input processing to locate the SPI and
683 * related information.
684 */
685struct xfrm_spi_skb_cb {
686 struct xfrm_tunnel_skb_cb header;
687
688 unsigned int daddroff;
689 unsigned int family;
690};
691
692#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
693
694/* Audit Information */
695struct xfrm_audit {
696 u32 secid;
697 kuid_t loginuid;
698 unsigned int sessionid;
699};
700
701#ifdef CONFIG_AUDITSYSCALL
702static inline struct audit_buffer *xfrm_audit_start(const char *op)
703{
704 struct audit_buffer *audit_buf = NULL;
705
706 if (audit_enabled == 0)
707 return NULL;
708 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
709 AUDIT_MAC_IPSEC_EVENT);
710 if (audit_buf == NULL)
711 return NULL;
712 audit_log_format(audit_buf, "op=%s", op);
713 return audit_buf;
714}
715
716static inline void xfrm_audit_helper_usrinfo(kuid_t auid, unsigned int ses, u32 secid,
717 struct audit_buffer *audit_buf)
718{
719 char *secctx;
720 u32 secctx_len;
721
722 audit_log_format(audit_buf, " auid=%u ses=%u",
723 from_kuid(&init_user_ns, auid), ses);
724 if (secid != 0 &&
725 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
726 audit_log_format(audit_buf, " subj=%s", secctx);
727 security_release_secctx(secctx, secctx_len);
728 } else
729 audit_log_task_context(audit_buf);
730}
731
732void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, kuid_t auid,
733 unsigned int ses, u32 secid);
734void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, kuid_t auid,
735 unsigned int ses, u32 secid);
736void xfrm_audit_state_add(struct xfrm_state *x, int result, kuid_t auid,
737 unsigned int ses, u32 secid);
738void xfrm_audit_state_delete(struct xfrm_state *x, int result, kuid_t auid,
739 unsigned int ses, u32 secid);
740void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
741 struct sk_buff *skb);
742void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
743 __be32 net_seq);
744void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
745void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
746 __be32 net_seq);
747void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
748 u8 proto);
749#else
750
751static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
752 kuid_t auid, unsigned int ses, u32 secid)
753{
754}
755
756static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
757 kuid_t auid, unsigned int ses, u32 secid)
758{
759}
760
761static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
762 kuid_t auid, unsigned int ses, u32 secid)
763{
764}
765
766static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
767 kuid_t auid, unsigned int ses, u32 secid)
768{
769}
770
771static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
772 struct sk_buff *skb)
773{
774}
775
776static inline void xfrm_audit_state_replay(struct xfrm_state *x,
777 struct sk_buff *skb, __be32 net_seq)
778{
779}
780
781static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
782 u16 family)
783{
784}
785
786static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
787 __be32 net_spi, __be32 net_seq)
788{
789}
790
791static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
792 struct sk_buff *skb, u8 proto)
793{
794}
795#endif /* CONFIG_AUDITSYSCALL */
796
797static inline void xfrm_pol_hold(struct xfrm_policy *policy)
798{
799 if (likely(policy != NULL))
800 atomic_inc(&policy->refcnt);
801}
802
803void xfrm_policy_destroy(struct xfrm_policy *policy);
804
805static inline void xfrm_pol_put(struct xfrm_policy *policy)
806{
807 if (atomic_dec_and_test(&policy->refcnt))
808 xfrm_policy_destroy(policy);
809}
810
811static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
812{
813 int i;
814 for (i = npols - 1; i >= 0; --i)
815 xfrm_pol_put(pols[i]);
816}
817
818void __xfrm_state_destroy(struct xfrm_state *);
819
820static inline void __xfrm_state_put(struct xfrm_state *x)
821{
822 atomic_dec(&x->refcnt);
823}
824
825static inline void xfrm_state_put(struct xfrm_state *x)
826{
827 if (atomic_dec_and_test(&x->refcnt))
828 __xfrm_state_destroy(x);
829}
830
831static inline void xfrm_state_hold(struct xfrm_state *x)
832{
833 atomic_inc(&x->refcnt);
834}
835
836static inline bool addr_match(const void *token1, const void *token2,
837 int prefixlen)
838{
839 const __be32 *a1 = token1;
840 const __be32 *a2 = token2;
841 int pdw;
842 int pbi;
843
844 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
845 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
846
847 if (pdw)
848 if (memcmp(a1, a2, pdw << 2))
849 return false;
850
851 if (pbi) {
852 __be32 mask;
853
854 mask = htonl((0xffffffff) << (32 - pbi));
855
856 if ((a1[pdw] ^ a2[pdw]) & mask)
857 return false;
858 }
859
860 return true;
861}
862
863static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
864{
865 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
866 if (prefixlen == 0)
867 return true;
868 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
869}
870
871static __inline__
872__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
873{
874 __be16 port;
875 switch(fl->flowi_proto) {
876 case IPPROTO_TCP:
877 case IPPROTO_UDP:
878 case IPPROTO_UDPLITE:
879 case IPPROTO_SCTP:
880 port = uli->ports.sport;
881 break;
882 case IPPROTO_ICMP:
883 case IPPROTO_ICMPV6:
884 port = htons(uli->icmpt.type);
885 break;
886 case IPPROTO_MH:
887 port = htons(uli->mht.type);
888 break;
889 case IPPROTO_GRE:
890 port = htons(ntohl(uli->gre_key) >> 16);
891 break;
892 default:
893 port = 0; /*XXX*/
894 }
895 return port;
896}
897
898static __inline__
899__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
900{
901 __be16 port;
902 switch(fl->flowi_proto) {
903 case IPPROTO_TCP:
904 case IPPROTO_UDP:
905 case IPPROTO_UDPLITE:
906 case IPPROTO_SCTP:
907 port = uli->ports.dport;
908 break;
909 case IPPROTO_ICMP:
910 case IPPROTO_ICMPV6:
911 port = htons(uli->icmpt.code);
912 break;
913 case IPPROTO_GRE:
914 port = htons(ntohl(uli->gre_key) & 0xffff);
915 break;
916 default:
917 port = 0; /*XXX*/
918 }
919 return port;
920}
921
922bool xfrm_selector_match(const struct xfrm_selector *sel,
923 const struct flowi *fl, unsigned short family);
924
925#ifdef CONFIG_SECURITY_NETWORK_XFRM
926/* If neither has a context --> match
927 * Otherwise, both must have a context and the sids, doi, alg must match
928 */
929static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
930{
931 return ((!s1 && !s2) ||
932 (s1 && s2 &&
933 (s1->ctx_sid == s2->ctx_sid) &&
934 (s1->ctx_doi == s2->ctx_doi) &&
935 (s1->ctx_alg == s2->ctx_alg)));
936}
937#else
938static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
939{
940 return true;
941}
942#endif
943
944/* A struct encoding bundle of transformations to apply to some set of flow.
945 *
946 * dst->child points to the next element of bundle.
947 * dst->xfrm points to an instanse of transformer.
948 *
949 * Due to unfortunate limitations of current routing cache, which we
950 * have no time to fix, it mirrors struct rtable and bound to the same
951 * routing key, including saddr,daddr. However, we can have many of
952 * bundles differing by session id. All the bundles grow from a parent
953 * policy rule.
954 */
955struct xfrm_dst {
956 union {
957 struct dst_entry dst;
958 struct rtable rt;
959 struct rt6_info rt6;
960 } u;
961 struct dst_entry *route;
962 struct flow_cache_object flo;
963 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
964 int num_pols, num_xfrms;
965#ifdef CONFIG_XFRM_SUB_POLICY
966 struct flowi *origin;
967 struct xfrm_selector *partner;
968#endif
969 u32 xfrm_genid;
970 u32 policy_genid;
971 u32 route_mtu_cached;
972 u32 child_mtu_cached;
973 u32 route_cookie;
974 u32 path_cookie;
975};
976
977#ifdef CONFIG_XFRM
978static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
979{
980 xfrm_pols_put(xdst->pols, xdst->num_pols);
981 dst_release(xdst->route);
982 if (likely(xdst->u.dst.xfrm))
983 xfrm_state_put(xdst->u.dst.xfrm);
984#ifdef CONFIG_XFRM_SUB_POLICY
985 kfree(xdst->origin);
986 xdst->origin = NULL;
987 kfree(xdst->partner);
988 xdst->partner = NULL;
989#endif
990}
991#endif
992
993void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
994
995struct sec_path {
996 atomic_t refcnt;
997 int len;
998 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
999};
1000
1001static inline int secpath_exists(struct sk_buff *skb)
1002{
1003#ifdef CONFIG_XFRM
1004 return skb->sp != NULL;
1005#else
1006 return 0;
1007#endif
1008}
1009
1010static inline struct sec_path *
1011secpath_get(struct sec_path *sp)
1012{
1013 if (sp)
1014 atomic_inc(&sp->refcnt);
1015 return sp;
1016}
1017
1018void __secpath_destroy(struct sec_path *sp);
1019
1020static inline void
1021secpath_put(struct sec_path *sp)
1022{
1023 if (sp && atomic_dec_and_test(&sp->refcnt))
1024 __secpath_destroy(sp);
1025}
1026
1027struct sec_path *secpath_dup(struct sec_path *src);
1028
1029static inline void
1030secpath_reset(struct sk_buff *skb)
1031{
1032#ifdef CONFIG_XFRM
1033 secpath_put(skb->sp);
1034 skb->sp = NULL;
1035#endif
1036}
1037
1038static inline int
1039xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1040{
1041 switch (family) {
1042 case AF_INET:
1043 return addr->a4 == 0;
1044 case AF_INET6:
1045 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1046 }
1047 return 0;
1048}
1049
1050static inline int
1051__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1052{
1053 return (tmpl->saddr.a4 &&
1054 tmpl->saddr.a4 != x->props.saddr.a4);
1055}
1056
1057static inline int
1058__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1059{
1060 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1061 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1062}
1063
1064static inline int
1065xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1066{
1067 switch (family) {
1068 case AF_INET:
1069 return __xfrm4_state_addr_cmp(tmpl, x);
1070 case AF_INET6:
1071 return __xfrm6_state_addr_cmp(tmpl, x);
1072 }
1073 return !0;
1074}
1075
1076#ifdef CONFIG_XFRM
1077int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1078 unsigned short family);
1079
1080static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1081 struct sk_buff *skb,
1082 unsigned int family, int reverse)
1083{
1084 struct net *net = dev_net(skb->dev);
1085 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1086
1087 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1088 return __xfrm_policy_check(sk, ndir, skb, family);
1089
1090 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1091 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1092 __xfrm_policy_check(sk, ndir, skb, family);
1093}
1094
1095static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1096{
1097 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1098}
1099
1100static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1101{
1102 return xfrm_policy_check(sk, dir, skb, AF_INET);
1103}
1104
1105static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1106{
1107 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1108}
1109
1110static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1111 struct sk_buff *skb)
1112{
1113 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1114}
1115
1116static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1117 struct sk_buff *skb)
1118{
1119 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1120}
1121
1122int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1123 unsigned int family, int reverse);
1124
1125static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1126 unsigned int family)
1127{
1128 return __xfrm_decode_session(skb, fl, family, 0);
1129}
1130
1131static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1132 struct flowi *fl,
1133 unsigned int family)
1134{
1135 return __xfrm_decode_session(skb, fl, family, 1);
1136}
1137
1138int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1139
1140static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1141{
1142 struct net *net = dev_net(skb->dev);
1143
1144 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1145 (skb_dst(skb)->flags & DST_NOXFRM) ||
1146 __xfrm_route_forward(skb, family);
1147}
1148
1149static inline int xfrm4_route_forward(struct sk_buff *skb)
1150{
1151 return xfrm_route_forward(skb, AF_INET);
1152}
1153
1154static inline int xfrm6_route_forward(struct sk_buff *skb)
1155{
1156 return xfrm_route_forward(skb, AF_INET6);
1157}
1158
1159int __xfrm_sk_clone_policy(struct sock *sk);
1160
1161static inline int xfrm_sk_clone_policy(struct sock *sk)
1162{
1163 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1164 return __xfrm_sk_clone_policy(sk);
1165 return 0;
1166}
1167
1168int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1169
1170static inline void xfrm_sk_free_policy(struct sock *sk)
1171{
1172 if (unlikely(sk->sk_policy[0] != NULL)) {
1173 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1174 sk->sk_policy[0] = NULL;
1175 }
1176 if (unlikely(sk->sk_policy[1] != NULL)) {
1177 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1178 sk->sk_policy[1] = NULL;
1179 }
1180}
1181
1182void xfrm_garbage_collect(struct net *net);
1183
1184#else
1185
1186static inline void xfrm_sk_free_policy(struct sock *sk) {}
1187static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1188static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1189static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1190static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1191{
1192 return 1;
1193}
1194static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1195{
1196 return 1;
1197}
1198static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1199{
1200 return 1;
1201}
1202static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1203 struct flowi *fl,
1204 unsigned int family)
1205{
1206 return -ENOSYS;
1207}
1208static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1209 struct sk_buff *skb)
1210{
1211 return 1;
1212}
1213static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1214 struct sk_buff *skb)
1215{
1216 return 1;
1217}
1218static inline void xfrm_garbage_collect(struct net *net)
1219{
1220}
1221#endif
1222
1223static __inline__
1224xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1225{
1226 switch (family){
1227 case AF_INET:
1228 return (xfrm_address_t *)&fl->u.ip4.daddr;
1229 case AF_INET6:
1230 return (xfrm_address_t *)&fl->u.ip6.daddr;
1231 }
1232 return NULL;
1233}
1234
1235static __inline__
1236xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1237{
1238 switch (family){
1239 case AF_INET:
1240 return (xfrm_address_t *)&fl->u.ip4.saddr;
1241 case AF_INET6:
1242 return (xfrm_address_t *)&fl->u.ip6.saddr;
1243 }
1244 return NULL;
1245}
1246
1247static __inline__
1248void xfrm_flowi_addr_get(const struct flowi *fl,
1249 xfrm_address_t *saddr, xfrm_address_t *daddr,
1250 unsigned short family)
1251{
1252 switch(family) {
1253 case AF_INET:
1254 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1255 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1256 break;
1257 case AF_INET6:
1258 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1259 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1260 break;
1261 }
1262}
1263
1264static __inline__ int
1265__xfrm4_state_addr_check(const struct xfrm_state *x,
1266 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1267{
1268 if (daddr->a4 == x->id.daddr.a4 &&
1269 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1270 return 1;
1271 return 0;
1272}
1273
1274static __inline__ int
1275__xfrm6_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277{
1278 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1279 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1280 ipv6_addr_any((struct in6_addr *)saddr) ||
1281 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1282 return 1;
1283 return 0;
1284}
1285
1286static __inline__ int
1287xfrm_state_addr_check(const struct xfrm_state *x,
1288 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1289 unsigned short family)
1290{
1291 switch (family) {
1292 case AF_INET:
1293 return __xfrm4_state_addr_check(x, daddr, saddr);
1294 case AF_INET6:
1295 return __xfrm6_state_addr_check(x, daddr, saddr);
1296 }
1297 return 0;
1298}
1299
1300static __inline__ int
1301xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1302 unsigned short family)
1303{
1304 switch (family) {
1305 case AF_INET:
1306 return __xfrm4_state_addr_check(x,
1307 (const xfrm_address_t *)&fl->u.ip4.daddr,
1308 (const xfrm_address_t *)&fl->u.ip4.saddr);
1309 case AF_INET6:
1310 return __xfrm6_state_addr_check(x,
1311 (const xfrm_address_t *)&fl->u.ip6.daddr,
1312 (const xfrm_address_t *)&fl->u.ip6.saddr);
1313 }
1314 return 0;
1315}
1316
1317static inline int xfrm_state_kern(const struct xfrm_state *x)
1318{
1319 return atomic_read(&x->tunnel_users);
1320}
1321
1322static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1323{
1324 return (!userproto || proto == userproto ||
1325 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1326 proto == IPPROTO_ESP ||
1327 proto == IPPROTO_COMP)));
1328}
1329
1330/*
1331 * xfrm algorithm information
1332 */
1333struct xfrm_algo_aead_info {
1334 u16 icv_truncbits;
1335};
1336
1337struct xfrm_algo_auth_info {
1338 u16 icv_truncbits;
1339 u16 icv_fullbits;
1340};
1341
1342struct xfrm_algo_encr_info {
1343 u16 blockbits;
1344 u16 defkeybits;
1345};
1346
1347struct xfrm_algo_comp_info {
1348 u16 threshold;
1349};
1350
1351struct xfrm_algo_desc {
1352 char *name;
1353 char *compat;
1354 u8 available:1;
1355 u8 pfkey_supported:1;
1356 union {
1357 struct xfrm_algo_aead_info aead;
1358 struct xfrm_algo_auth_info auth;
1359 struct xfrm_algo_encr_info encr;
1360 struct xfrm_algo_comp_info comp;
1361 } uinfo;
1362 struct sadb_alg desc;
1363};
1364
1365/* XFRM protocol handlers. */
1366struct xfrm4_protocol {
1367 int (*handler)(struct sk_buff *skb);
1368 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1369 int encap_type);
1370 int (*cb_handler)(struct sk_buff *skb, int err);
1371 int (*err_handler)(struct sk_buff *skb, u32 info);
1372
1373 struct xfrm4_protocol __rcu *next;
1374 int priority;
1375};
1376
1377struct xfrm6_protocol {
1378 int (*handler)(struct sk_buff *skb);
1379 int (*cb_handler)(struct sk_buff *skb, int err);
1380 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1381 u8 type, u8 code, int offset, __be32 info);
1382
1383 struct xfrm6_protocol __rcu *next;
1384 int priority;
1385};
1386
1387/* XFRM tunnel handlers. */
1388struct xfrm_tunnel {
1389 int (*handler)(struct sk_buff *skb);
1390 int (*err_handler)(struct sk_buff *skb, u32 info);
1391
1392 struct xfrm_tunnel __rcu *next;
1393 int priority;
1394};
1395
1396struct xfrm6_tunnel {
1397 int (*handler)(struct sk_buff *skb);
1398 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1399 u8 type, u8 code, int offset, __be32 info);
1400 struct xfrm6_tunnel __rcu *next;
1401 int priority;
1402};
1403
1404void xfrm_init(void);
1405void xfrm4_init(void);
1406int xfrm_state_init(struct net *net);
1407void xfrm_state_fini(struct net *net);
1408void xfrm4_state_init(void);
1409void xfrm4_protocol_init(void);
1410#ifdef CONFIG_XFRM
1411int xfrm6_init(void);
1412void xfrm6_fini(void);
1413int xfrm6_state_init(void);
1414void xfrm6_state_fini(void);
1415int xfrm6_protocol_init(void);
1416void xfrm6_protocol_fini(void);
1417#else
1418static inline int xfrm6_init(void)
1419{
1420 return 0;
1421}
1422static inline void xfrm6_fini(void)
1423{
1424 ;
1425}
1426#endif
1427
1428#ifdef CONFIG_XFRM_STATISTICS
1429int xfrm_proc_init(struct net *net);
1430void xfrm_proc_fini(struct net *net);
1431#endif
1432
1433int xfrm_sysctl_init(struct net *net);
1434#ifdef CONFIG_SYSCTL
1435void xfrm_sysctl_fini(struct net *net);
1436#else
1437static inline void xfrm_sysctl_fini(struct net *net)
1438{
1439}
1440#endif
1441
1442void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1443 struct xfrm_address_filter *filter);
1444int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1445 int (*func)(struct xfrm_state *, int, void*), void *);
1446void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1447struct xfrm_state *xfrm_state_alloc(struct net *net);
1448struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1449 const xfrm_address_t *saddr,
1450 const struct flowi *fl,
1451 struct xfrm_tmpl *tmpl,
1452 struct xfrm_policy *pol, int *err,
1453 unsigned short family);
1454struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1455 xfrm_address_t *daddr,
1456 xfrm_address_t *saddr,
1457 unsigned short family,
1458 u8 mode, u8 proto, u32 reqid);
1459struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1460 unsigned short family);
1461int xfrm_state_check_expire(struct xfrm_state *x);
1462void xfrm_state_insert(struct xfrm_state *x);
1463int xfrm_state_add(struct xfrm_state *x);
1464int xfrm_state_update(struct xfrm_state *x);
1465struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1466 const xfrm_address_t *daddr, __be32 spi,
1467 u8 proto, unsigned short family);
1468struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1469 const xfrm_address_t *daddr,
1470 const xfrm_address_t *saddr,
1471 u8 proto,
1472 unsigned short family);
1473#ifdef CONFIG_XFRM_SUB_POLICY
1474int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1475 unsigned short family, struct net *net);
1476int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1477 unsigned short family);
1478#else
1479static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1480 int n, unsigned short family, struct net *net)
1481{
1482 return -ENOSYS;
1483}
1484
1485static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1486 int n, unsigned short family)
1487{
1488 return -ENOSYS;
1489}
1490#endif
1491
1492struct xfrmk_sadinfo {
1493 u32 sadhcnt; /* current hash bkts */
1494 u32 sadhmcnt; /* max allowed hash bkts */
1495 u32 sadcnt; /* current running count */
1496};
1497
1498struct xfrmk_spdinfo {
1499 u32 incnt;
1500 u32 outcnt;
1501 u32 fwdcnt;
1502 u32 inscnt;
1503 u32 outscnt;
1504 u32 fwdscnt;
1505 u32 spdhcnt;
1506 u32 spdhmcnt;
1507};
1508
1509struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1510int xfrm_state_delete(struct xfrm_state *x);
1511int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1512void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1513void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1514u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1515int xfrm_init_replay(struct xfrm_state *x);
1516int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1517int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1518int xfrm_init_state(struct xfrm_state *x);
1519int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1520int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1521int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1522int xfrm_output_resume(struct sk_buff *skb, int err);
1523int xfrm_output(struct sk_buff *skb);
1524int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1525void xfrm_local_error(struct sk_buff *skb, int mtu);
1526int xfrm4_extract_header(struct sk_buff *skb);
1527int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1528int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1529 int encap_type);
1530int xfrm4_transport_finish(struct sk_buff *skb, int async);
1531int xfrm4_rcv(struct sk_buff *skb);
1532
1533static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1534{
1535 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1536 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1537 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1538 return xfrm_input(skb, nexthdr, spi, 0);
1539}
1540
1541int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1542int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1543int xfrm4_output(struct sock *sk, struct sk_buff *skb);
1544int xfrm4_output_finish(struct sk_buff *skb);
1545int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1546int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1547int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1548int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1549int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1550void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1551int xfrm6_extract_header(struct sk_buff *skb);
1552int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1553int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1554int xfrm6_transport_finish(struct sk_buff *skb, int async);
1555int xfrm6_rcv(struct sk_buff *skb);
1556int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1557 xfrm_address_t *saddr, u8 proto);
1558void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1559int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1560int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1561int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1562int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1563int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1564__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1565__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1566int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1567int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1568int xfrm6_output(struct sock *sk, struct sk_buff *skb);
1569int xfrm6_output_finish(struct sk_buff *skb);
1570int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1571 u8 **prevhdr);
1572
1573#ifdef CONFIG_XFRM
1574int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1575int xfrm_user_policy(struct sock *sk, int optname,
1576 u8 __user *optval, int optlen);
1577#else
1578static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1579{
1580 return -ENOPROTOOPT;
1581}
1582
1583static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1584{
1585 /* should not happen */
1586 kfree_skb(skb);
1587 return 0;
1588}
1589#endif
1590
1591struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1592
1593void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1594int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1595 int (*func)(struct xfrm_policy *, int, int, void*),
1596 void *);
1597void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1598int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1599struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1600 u8 type, int dir,
1601 struct xfrm_selector *sel,
1602 struct xfrm_sec_ctx *ctx, int delete,
1603 int *err);
1604struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1605 u32 id, int delete, int *err);
1606int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1607u32 xfrm_get_acqseq(void);
1608int verify_spi_info(u8 proto, u32 min, u32 max);
1609int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1610struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1611 u8 mode, u32 reqid, u8 proto,
1612 const xfrm_address_t *daddr,
1613 const xfrm_address_t *saddr, int create,
1614 unsigned short family);
1615int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1616
1617#ifdef CONFIG_XFRM_MIGRATE
1618int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1619 const struct xfrm_migrate *m, int num_bundles,
1620 const struct xfrm_kmaddress *k);
1621struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1622struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1623 struct xfrm_migrate *m);
1624int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1625 struct xfrm_migrate *m, int num_bundles,
1626 struct xfrm_kmaddress *k, struct net *net);
1627#endif
1628
1629int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1630void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1631int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1632 xfrm_address_t *addr);
1633
1634void xfrm_input_init(void);
1635int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1636
1637void xfrm_probe_algs(void);
1638int xfrm_count_pfkey_auth_supported(void);
1639int xfrm_count_pfkey_enc_supported(void);
1640struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1641struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1642struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1643struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1644struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1645struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1646struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1647struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1648struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1649 int probe);
1650
1651static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1652 const xfrm_address_t *b)
1653{
1654 return ipv6_addr_equal((const struct in6_addr *)a,
1655 (const struct in6_addr *)b);
1656}
1657
1658static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1659 const xfrm_address_t *b,
1660 sa_family_t family)
1661{
1662 switch (family) {
1663 default:
1664 case AF_INET:
1665 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1666 case AF_INET6:
1667 return xfrm6_addr_equal(a, b);
1668 }
1669}
1670
1671static inline int xfrm_policy_id2dir(u32 index)
1672{
1673 return index & 7;
1674}
1675
1676#ifdef CONFIG_XFRM
1677static inline int xfrm_aevent_is_on(struct net *net)
1678{
1679 struct sock *nlsk;
1680 int ret = 0;
1681
1682 rcu_read_lock();
1683 nlsk = rcu_dereference(net->xfrm.nlsk);
1684 if (nlsk)
1685 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1686 rcu_read_unlock();
1687 return ret;
1688}
1689
1690static inline int xfrm_acquire_is_on(struct net *net)
1691{
1692 struct sock *nlsk;
1693 int ret = 0;
1694
1695 rcu_read_lock();
1696 nlsk = rcu_dereference(net->xfrm.nlsk);
1697 if (nlsk)
1698 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1699 rcu_read_unlock();
1700
1701 return ret;
1702}
1703#endif
1704
1705static inline int aead_len(struct xfrm_algo_aead *alg)
1706{
1707 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1708}
1709
1710static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1711{
1712 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1713}
1714
1715static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1716{
1717 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1718}
1719
1720static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1721{
1722 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1723}
1724
1725#ifdef CONFIG_XFRM_MIGRATE
1726static inline int xfrm_replay_clone(struct xfrm_state *x,
1727 struct xfrm_state *orig)
1728{
1729 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1730 GFP_KERNEL);
1731 if (!x->replay_esn)
1732 return -ENOMEM;
1733
1734 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1735 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1736
1737 x->preplay_esn = kmemdup(x->replay_esn,
1738 xfrm_replay_state_esn_len(x->replay_esn),
1739 GFP_KERNEL);
1740 if (!x->preplay_esn) {
1741 kfree(x->replay_esn);
1742 return -ENOMEM;
1743 }
1744
1745 return 0;
1746}
1747
1748static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1749{
1750 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1751}
1752
1753
1754static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1755{
1756 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1757}
1758
1759static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1760{
1761 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1762}
1763
1764static inline void xfrm_states_put(struct xfrm_state **states, int n)
1765{
1766 int i;
1767 for (i = 0; i < n; i++)
1768 xfrm_state_put(*(states + i));
1769}
1770
1771static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1772{
1773 int i;
1774 for (i = 0; i < n; i++)
1775 xfrm_state_delete(*(states + i));
1776}
1777#endif
1778
1779#ifdef CONFIG_XFRM
1780static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1781{
1782 return skb->sp->xvec[skb->sp->len - 1];
1783}
1784#endif
1785
1786static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1787{
1788 if (attrs[XFRMA_MARK])
1789 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1790 else
1791 m->v = m->m = 0;
1792
1793 return m->v & m->m;
1794}
1795
1796static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1797{
1798 int ret = 0;
1799
1800 if (m->m | m->v)
1801 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1802 return ret;
1803}
1804
1805static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1806 unsigned int family)
1807{
1808 bool tunnel = false;
1809
1810 switch(family) {
1811 case AF_INET:
1812 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1813 tunnel = true;
1814 break;
1815 case AF_INET6:
1816 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1817 tunnel = true;
1818 break;
1819 }
1820 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1821 return -EINVAL;
1822
1823 return 0;
1824}
1825#endif /* _NET_XFRM_H */