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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__
831__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
832{
833 __be16 port;
834 switch(fl->flowi_proto) {
835 case IPPROTO_TCP:
836 case IPPROTO_UDP:
837 case IPPROTO_UDPLITE:
838 case IPPROTO_SCTP:
839 port = uli->ports.sport;
840 break;
841 case IPPROTO_ICMP:
842 case IPPROTO_ICMPV6:
843 port = htons(uli->icmpt.type);
844 break;
845 case IPPROTO_MH:
846 port = htons(uli->mht.type);
847 break;
848 case IPPROTO_GRE:
849 port = htons(ntohl(uli->gre_key) >> 16);
850 break;
851 default:
852 port = 0; /*XXX*/
853 }
854 return port;
855}
856
857static __inline__
858__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
859{
860 __be16 port;
861 switch(fl->flowi_proto) {
862 case IPPROTO_TCP:
863 case IPPROTO_UDP:
864 case IPPROTO_UDPLITE:
865 case IPPROTO_SCTP:
866 port = uli->ports.dport;
867 break;
868 case IPPROTO_ICMP:
869 case IPPROTO_ICMPV6:
870 port = htons(uli->icmpt.code);
871 break;
872 case IPPROTO_GRE:
873 port = htons(ntohl(uli->gre_key) & 0xffff);
874 break;
875 default:
876 port = 0; /*XXX*/
877 }
878 return port;
879}
880
881extern int xfrm_selector_match(const struct xfrm_selector *sel,
882 const struct flowi *fl,
883 unsigned short family);
884
885#ifdef CONFIG_SECURITY_NETWORK_XFRM
886/* If neither has a context --> match
887 * Otherwise, both must have a context and the sids, doi, alg must match
888 */
889static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
890{
891 return ((!s1 && !s2) ||
892 (s1 && s2 &&
893 (s1->ctx_sid == s2->ctx_sid) &&
894 (s1->ctx_doi == s2->ctx_doi) &&
895 (s1->ctx_alg == s2->ctx_alg)));
896}
897#else
898static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
899{
900 return 1;
901}
902#endif
903
904/* A struct encoding bundle of transformations to apply to some set of flow.
905 *
906 * dst->child points to the next element of bundle.
907 * dst->xfrm points to an instanse of transformer.
908 *
909 * Due to unfortunate limitations of current routing cache, which we
910 * have no time to fix, it mirrors struct rtable and bound to the same
911 * routing key, including saddr,daddr. However, we can have many of
912 * bundles differing by session id. All the bundles grow from a parent
913 * policy rule.
914 */
915struct xfrm_dst {
916 union {
917 struct dst_entry dst;
918 struct rtable rt;
919 struct rt6_info rt6;
920 } u;
921 struct dst_entry *route;
922 struct flow_cache_object flo;
923 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
924 int num_pols, num_xfrms;
925#ifdef CONFIG_XFRM_SUB_POLICY
926 struct flowi *origin;
927 struct xfrm_selector *partner;
928#endif
929 u32 xfrm_genid;
930 u32 policy_genid;
931 u32 route_mtu_cached;
932 u32 child_mtu_cached;
933 u32 route_cookie;
934 u32 path_cookie;
935};
936
937#ifdef CONFIG_XFRM
938static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
939{
940 xfrm_pols_put(xdst->pols, xdst->num_pols);
941 dst_release(xdst->route);
942 if (likely(xdst->u.dst.xfrm))
943 xfrm_state_put(xdst->u.dst.xfrm);
944#ifdef CONFIG_XFRM_SUB_POLICY
945 kfree(xdst->origin);
946 xdst->origin = NULL;
947 kfree(xdst->partner);
948 xdst->partner = NULL;
949#endif
950}
951#endif
952
953extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
954
955struct sec_path {
956 atomic_t refcnt;
957 int len;
958 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
959};
960
961static inline int secpath_exists(struct sk_buff *skb)
962{
963#ifdef CONFIG_XFRM
964 return skb->sp != NULL;
965#else
966 return 0;
967#endif
968}
969
970static inline struct sec_path *
971secpath_get(struct sec_path *sp)
972{
973 if (sp)
974 atomic_inc(&sp->refcnt);
975 return sp;
976}
977
978extern void __secpath_destroy(struct sec_path *sp);
979
980static inline void
981secpath_put(struct sec_path *sp)
982{
983 if (sp && atomic_dec_and_test(&sp->refcnt))
984 __secpath_destroy(sp);
985}
986
987extern struct sec_path *secpath_dup(struct sec_path *src);
988
989static inline void
990secpath_reset(struct sk_buff *skb)
991{
992#ifdef CONFIG_XFRM
993 secpath_put(skb->sp);
994 skb->sp = NULL;
995#endif
996}
997
998static inline int
999xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1000{
1001 switch (family) {
1002 case AF_INET:
1003 return addr->a4 == 0;
1004 case AF_INET6:
1005 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1006 }
1007 return 0;
1008}
1009
1010static inline int
1011__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1012{
1013 return (tmpl->saddr.a4 &&
1014 tmpl->saddr.a4 != x->props.saddr.a4);
1015}
1016
1017static inline int
1018__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1019{
1020 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1021 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1022}
1023
1024static inline int
1025xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1026{
1027 switch (family) {
1028 case AF_INET:
1029 return __xfrm4_state_addr_cmp(tmpl, x);
1030 case AF_INET6:
1031 return __xfrm6_state_addr_cmp(tmpl, x);
1032 }
1033 return !0;
1034}
1035
1036#ifdef CONFIG_XFRM
1037extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1038
1039static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1040 struct sk_buff *skb,
1041 unsigned int family, int reverse)
1042{
1043 struct net *net = dev_net(skb->dev);
1044 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1045
1046 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1047 return __xfrm_policy_check(sk, ndir, skb, family);
1048
1049 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1050 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1051 __xfrm_policy_check(sk, ndir, skb, family);
1052}
1053
1054static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1055{
1056 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1057}
1058
1059static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1060{
1061 return xfrm_policy_check(sk, dir, skb, AF_INET);
1062}
1063
1064static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1065{
1066 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1067}
1068
1069static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1070 struct sk_buff *skb)
1071{
1072 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1073}
1074
1075static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1076 struct sk_buff *skb)
1077{
1078 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1079}
1080
1081extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1082 unsigned int family, int reverse);
1083
1084static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1085 unsigned int family)
1086{
1087 return __xfrm_decode_session(skb, fl, family, 0);
1088}
1089
1090static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1091 struct flowi *fl,
1092 unsigned int family)
1093{
1094 return __xfrm_decode_session(skb, fl, family, 1);
1095}
1096
1097extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1098
1099static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1100{
1101 struct net *net = dev_net(skb->dev);
1102
1103 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1104 (skb_dst(skb)->flags & DST_NOXFRM) ||
1105 __xfrm_route_forward(skb, family);
1106}
1107
1108static inline int xfrm4_route_forward(struct sk_buff *skb)
1109{
1110 return xfrm_route_forward(skb, AF_INET);
1111}
1112
1113static inline int xfrm6_route_forward(struct sk_buff *skb)
1114{
1115 return xfrm_route_forward(skb, AF_INET6);
1116}
1117
1118extern int __xfrm_sk_clone_policy(struct sock *sk);
1119
1120static inline int xfrm_sk_clone_policy(struct sock *sk)
1121{
1122 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1123 return __xfrm_sk_clone_policy(sk);
1124 return 0;
1125}
1126
1127extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1128
1129static inline void xfrm_sk_free_policy(struct sock *sk)
1130{
1131 if (unlikely(sk->sk_policy[0] != NULL)) {
1132 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1133 sk->sk_policy[0] = NULL;
1134 }
1135 if (unlikely(sk->sk_policy[1] != NULL)) {
1136 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1137 sk->sk_policy[1] = NULL;
1138 }
1139}
1140
1141#else
1142
1143static inline void xfrm_sk_free_policy(struct sock *sk) {}
1144static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1145static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1146static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1147static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1148{
1149 return 1;
1150}
1151static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1152{
1153 return 1;
1154}
1155static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1156{
1157 return 1;
1158}
1159static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1160 struct flowi *fl,
1161 unsigned int family)
1162{
1163 return -ENOSYS;
1164}
1165static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1166 struct sk_buff *skb)
1167{
1168 return 1;
1169}
1170static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1171 struct sk_buff *skb)
1172{
1173 return 1;
1174}
1175#endif
1176
1177static __inline__
1178xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1179{
1180 switch (family){
1181 case AF_INET:
1182 return (xfrm_address_t *)&fl->u.ip4.daddr;
1183 case AF_INET6:
1184 return (xfrm_address_t *)&fl->u.ip6.daddr;
1185 }
1186 return NULL;
1187}
1188
1189static __inline__
1190xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1191{
1192 switch (family){
1193 case AF_INET:
1194 return (xfrm_address_t *)&fl->u.ip4.saddr;
1195 case AF_INET6:
1196 return (xfrm_address_t *)&fl->u.ip6.saddr;
1197 }
1198 return NULL;
1199}
1200
1201static __inline__
1202void xfrm_flowi_addr_get(const struct flowi *fl,
1203 xfrm_address_t *saddr, xfrm_address_t *daddr,
1204 unsigned short family)
1205{
1206 switch(family) {
1207 case AF_INET:
1208 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1209 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1210 break;
1211 case AF_INET6:
1212 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->u.ip6.saddr);
1213 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->u.ip6.daddr);
1214 break;
1215 }
1216}
1217
1218static __inline__ int
1219__xfrm4_state_addr_check(const struct xfrm_state *x,
1220 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1221{
1222 if (daddr->a4 == x->id.daddr.a4 &&
1223 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1224 return 1;
1225 return 0;
1226}
1227
1228static __inline__ int
1229__xfrm6_state_addr_check(const struct xfrm_state *x,
1230 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1231{
1232 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1233 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1234 ipv6_addr_any((struct in6_addr *)saddr) ||
1235 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1236 return 1;
1237 return 0;
1238}
1239
1240static __inline__ int
1241xfrm_state_addr_check(const struct xfrm_state *x,
1242 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1243 unsigned short family)
1244{
1245 switch (family) {
1246 case AF_INET:
1247 return __xfrm4_state_addr_check(x, daddr, saddr);
1248 case AF_INET6:
1249 return __xfrm6_state_addr_check(x, daddr, saddr);
1250 }
1251 return 0;
1252}
1253
1254static __inline__ int
1255xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1256 unsigned short family)
1257{
1258 switch (family) {
1259 case AF_INET:
1260 return __xfrm4_state_addr_check(x,
1261 (const xfrm_address_t *)&fl->u.ip4.daddr,
1262 (const xfrm_address_t *)&fl->u.ip4.saddr);
1263 case AF_INET6:
1264 return __xfrm6_state_addr_check(x,
1265 (const xfrm_address_t *)&fl->u.ip6.daddr,
1266 (const xfrm_address_t *)&fl->u.ip6.saddr);
1267 }
1268 return 0;
1269}
1270
1271static inline int xfrm_state_kern(const struct xfrm_state *x)
1272{
1273 return atomic_read(&x->tunnel_users);
1274}
1275
1276static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1277{
1278 return (!userproto || proto == userproto ||
1279 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1280 proto == IPPROTO_ESP ||
1281 proto == IPPROTO_COMP)));
1282}
1283
1284/*
1285 * xfrm algorithm information
1286 */
1287struct xfrm_algo_aead_info {
1288 u16 icv_truncbits;
1289};
1290
1291struct xfrm_algo_auth_info {
1292 u16 icv_truncbits;
1293 u16 icv_fullbits;
1294};
1295
1296struct xfrm_algo_encr_info {
1297 u16 blockbits;
1298 u16 defkeybits;
1299};
1300
1301struct xfrm_algo_comp_info {
1302 u16 threshold;
1303};
1304
1305struct xfrm_algo_desc {
1306 char *name;
1307 char *compat;
1308 u8 available:1;
1309 union {
1310 struct xfrm_algo_aead_info aead;
1311 struct xfrm_algo_auth_info auth;
1312 struct xfrm_algo_encr_info encr;
1313 struct xfrm_algo_comp_info comp;
1314 } uinfo;
1315 struct sadb_alg desc;
1316};
1317
1318/* XFRM tunnel handlers. */
1319struct xfrm_tunnel {
1320 int (*handler)(struct sk_buff *skb);
1321 int (*err_handler)(struct sk_buff *skb, u32 info);
1322
1323 struct xfrm_tunnel __rcu *next;
1324 int priority;
1325};
1326
1327struct xfrm6_tunnel {
1328 int (*handler)(struct sk_buff *skb);
1329 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1330 u8 type, u8 code, int offset, __be32 info);
1331 struct xfrm6_tunnel __rcu *next;
1332 int priority;
1333};
1334
1335extern void xfrm_init(void);
1336extern void xfrm4_init(int rt_hash_size);
1337extern int xfrm_state_init(struct net *net);
1338extern void xfrm_state_fini(struct net *net);
1339extern void xfrm4_state_init(void);
1340#ifdef CONFIG_XFRM
1341extern int xfrm6_init(void);
1342extern void xfrm6_fini(void);
1343extern int xfrm6_state_init(void);
1344extern void xfrm6_state_fini(void);
1345#else
1346static inline int xfrm6_init(void)
1347{
1348 return 0;
1349}
1350static inline void xfrm6_fini(void)
1351{
1352 ;
1353}
1354#endif
1355
1356#ifdef CONFIG_XFRM_STATISTICS
1357extern int xfrm_proc_init(struct net *net);
1358extern void xfrm_proc_fini(struct net *net);
1359#endif
1360
1361extern int xfrm_sysctl_init(struct net *net);
1362#ifdef CONFIG_SYSCTL
1363extern void xfrm_sysctl_fini(struct net *net);
1364#else
1365static inline void xfrm_sysctl_fini(struct net *net)
1366{
1367}
1368#endif
1369
1370extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1371extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1372 int (*func)(struct xfrm_state *, int, void*), void *);
1373extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1374extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1375extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1376 const xfrm_address_t *saddr,
1377 const struct flowi *fl,
1378 struct xfrm_tmpl *tmpl,
1379 struct xfrm_policy *pol, int *err,
1380 unsigned short family);
1381extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1382 xfrm_address_t *daddr,
1383 xfrm_address_t *saddr,
1384 unsigned short family,
1385 u8 mode, u8 proto, u32 reqid);
1386extern int xfrm_state_check_expire(struct xfrm_state *x);
1387extern void xfrm_state_insert(struct xfrm_state *x);
1388extern int xfrm_state_add(struct xfrm_state *x);
1389extern int xfrm_state_update(struct xfrm_state *x);
1390extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1391 const xfrm_address_t *daddr, __be32 spi,
1392 u8 proto, unsigned short family);
1393extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1394 const xfrm_address_t *daddr,
1395 const xfrm_address_t *saddr,
1396 u8 proto,
1397 unsigned short family);
1398#ifdef CONFIG_XFRM_SUB_POLICY
1399extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1400 int n, unsigned short family);
1401extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1402 int n, unsigned short family);
1403#else
1404static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1405 int n, unsigned short family)
1406{
1407 return -ENOSYS;
1408}
1409
1410static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1411 int n, unsigned short family)
1412{
1413 return -ENOSYS;
1414}
1415#endif
1416
1417struct xfrmk_sadinfo {
1418 u32 sadhcnt; /* current hash bkts */
1419 u32 sadhmcnt; /* max allowed hash bkts */
1420 u32 sadcnt; /* current running count */
1421};
1422
1423struct xfrmk_spdinfo {
1424 u32 incnt;
1425 u32 outcnt;
1426 u32 fwdcnt;
1427 u32 inscnt;
1428 u32 outscnt;
1429 u32 fwdscnt;
1430 u32 spdhcnt;
1431 u32 spdhmcnt;
1432};
1433
1434extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1435 u32 seq);
1436extern int xfrm_state_delete(struct xfrm_state *x);
1437extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1438extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1439extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1440extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1441extern int xfrm_init_replay(struct xfrm_state *x);
1442extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1443extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1444extern int xfrm_init_state(struct xfrm_state *x);
1445extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1446extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1447 int encap_type);
1448extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1449extern int xfrm_output_resume(struct sk_buff *skb, int err);
1450extern int xfrm_output(struct sk_buff *skb);
1451extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1452extern int xfrm4_extract_header(struct sk_buff *skb);
1453extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1454extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1455 int encap_type);
1456extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1457extern int xfrm4_rcv(struct sk_buff *skb);
1458
1459static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1460{
1461 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1462}
1463
1464extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1465extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1466extern int xfrm4_output(struct sk_buff *skb);
1467extern int xfrm4_output_finish(struct sk_buff *skb);
1468extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1469extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1470extern int xfrm6_extract_header(struct sk_buff *skb);
1471extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1472extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1473extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1474extern int xfrm6_rcv(struct sk_buff *skb);
1475extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1476 xfrm_address_t *saddr, u8 proto);
1477extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1478extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1479extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1480extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1481extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1482extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1483extern int xfrm6_output(struct sk_buff *skb);
1484extern int xfrm6_output_finish(struct sk_buff *skb);
1485extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1486 u8 **prevhdr);
1487
1488#ifdef CONFIG_XFRM
1489extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1490extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1491#else
1492static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1493{
1494 return -ENOPROTOOPT;
1495}
1496
1497static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1498{
1499 /* should not happen */
1500 kfree_skb(skb);
1501 return 0;
1502}
1503#endif
1504
1505struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1506
1507extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1508extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1509 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1510extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1511int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1512struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1513 u8 type, int dir,
1514 struct xfrm_selector *sel,
1515 struct xfrm_sec_ctx *ctx, int delete,
1516 int *err);
1517struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1518int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1519u32 xfrm_get_acqseq(void);
1520extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1521struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1522 u8 mode, u32 reqid, u8 proto,
1523 const xfrm_address_t *daddr,
1524 const xfrm_address_t *saddr, int create,
1525 unsigned short family);
1526extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1527
1528#ifdef CONFIG_XFRM_MIGRATE
1529extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1530 const struct xfrm_migrate *m, int num_bundles,
1531 const struct xfrm_kmaddress *k);
1532extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1533extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1534 struct xfrm_migrate *m);
1535extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1536 struct xfrm_migrate *m, int num_bundles,
1537 struct xfrm_kmaddress *k);
1538#endif
1539
1540extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1541extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1542extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1543
1544extern void xfrm_input_init(void);
1545extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1546
1547extern void xfrm_probe_algs(void);
1548extern int xfrm_count_auth_supported(void);
1549extern int xfrm_count_enc_supported(void);
1550extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1551extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1552extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1553extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1554extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1555extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1556extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1557extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1558extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1559 int probe);
1560
1561struct hash_desc;
1562struct scatterlist;
1563typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1564 unsigned int);
1565
1566static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1567 const xfrm_address_t *b,
1568 int family)
1569{
1570 switch (family) {
1571 default:
1572 case AF_INET:
1573 return (__force u32)a->a4 - (__force u32)b->a4;
1574 case AF_INET6:
1575 return ipv6_addr_cmp((const struct in6_addr *)a,
1576 (const struct in6_addr *)b);
1577 }
1578}
1579
1580static inline int xfrm_policy_id2dir(u32 index)
1581{
1582 return index & 7;
1583}
1584
1585#ifdef CONFIG_XFRM
1586static inline int xfrm_aevent_is_on(struct net *net)
1587{
1588 struct sock *nlsk;
1589 int ret = 0;
1590
1591 rcu_read_lock();
1592 nlsk = rcu_dereference(net->xfrm.nlsk);
1593 if (nlsk)
1594 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1595 rcu_read_unlock();
1596 return ret;
1597}
1598#endif
1599
1600static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1601{
1602 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1603}
1604
1605static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1606{
1607 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1608}
1609
1610static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1611{
1612 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1613}
1614
1615#ifdef CONFIG_XFRM_MIGRATE
1616static inline int xfrm_replay_clone(struct xfrm_state *x,
1617 struct xfrm_state *orig)
1618{
1619 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1620 GFP_KERNEL);
1621 if (!x->replay_esn)
1622 return -ENOMEM;
1623
1624 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1625 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1626
1627 x->preplay_esn = kmemdup(x->replay_esn,
1628 xfrm_replay_state_esn_len(x->replay_esn),
1629 GFP_KERNEL);
1630 if (!x->preplay_esn) {
1631 kfree(x->replay_esn);
1632 return -ENOMEM;
1633 }
1634
1635 return 0;
1636}
1637
1638static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1639{
1640 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1641}
1642
1643static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1644{
1645 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1646}
1647
1648static inline void xfrm_states_put(struct xfrm_state **states, int n)
1649{
1650 int i;
1651 for (i = 0; i < n; i++)
1652 xfrm_state_put(*(states + i));
1653}
1654
1655static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1656{
1657 int i;
1658 for (i = 0; i < n; i++)
1659 xfrm_state_delete(*(states + i));
1660}
1661#endif
1662
1663#ifdef CONFIG_XFRM
1664static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1665{
1666 return skb->sp->xvec[skb->sp->len - 1];
1667}
1668#endif
1669
1670static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1671{
1672 if (attrs[XFRMA_MARK])
1673 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1674 else
1675 m->v = m->m = 0;
1676
1677 return m->v & m->m;
1678}
1679
1680static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1681{
1682 if (m->m | m->v)
1683 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1684 return 0;
1685
1686nla_put_failure:
1687 return -1;
1688}
1689
1690#endif /* _NET_XFRM_H */
1#ifndef _NET_XFRM_H
2#define _NET_XFRM_H
3
4#include <linux/compiler.h>
5#include <linux/xfrm.h>
6#include <linux/spinlock.h>
7#include <linux/list.h>
8#include <linux/skbuff.h>
9#include <linux/socket.h>
10#include <linux/pfkeyv2.h>
11#include <linux/ipsec.h>
12#include <linux/in6.h>
13#include <linux/mutex.h>
14#include <linux/audit.h>
15#include <linux/slab.h>
16
17#include <net/sock.h>
18#include <net/dst.h>
19#include <net/ip.h>
20#include <net/route.h>
21#include <net/ipv6.h>
22#include <net/ip6_fib.h>
23#include <net/flow.h>
24
25#include <linux/interrupt.h>
26
27#ifdef CONFIG_XFRM_STATISTICS
28#include <net/snmp.h>
29#endif
30
31#define XFRM_PROTO_ESP 50
32#define XFRM_PROTO_AH 51
33#define XFRM_PROTO_COMP 108
34#define XFRM_PROTO_IPIP 4
35#define XFRM_PROTO_IPV6 41
36#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41#define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46#ifdef CONFIG_XFRM_STATISTICS
47#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48#else
49#define XFRM_INC_STATS(net, field) ((void)(net))
50#endif
51
52
53/* Organization of SPD aka "XFRM rules"
54 ------------------------------------
55
56 Basic objects:
57 - policy rule, struct xfrm_policy (=SPD entry)
58 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
59 - instance of a transformer, struct xfrm_state (=SA)
60 - template to clone xfrm_state, struct xfrm_tmpl
61
62 SPD is plain linear list of xfrm_policy rules, ordered by priority.
63 (To be compatible with existing pfkeyv2 implementations,
64 many rules with priority of 0x7fffffff are allowed to exist and
65 such rules are ordered in an unpredictable way, thanks to bsd folks.)
66
67 Lookup is plain linear search until the first match with selector.
68
69 If "action" is "block", then we prohibit the flow, otherwise:
70 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
71 policy entry has list of up to XFRM_MAX_DEPTH transformations,
72 described by templates xfrm_tmpl. Each template is resolved
73 to a complete xfrm_state (see below) and we pack bundle of transformations
74 to a dst_entry returned to requestor.
75
76 dst -. xfrm .-> xfrm_state #1
77 |---. child .-> dst -. xfrm .-> xfrm_state #2
78 |---. child .-> dst -. xfrm .-> xfrm_state #3
79 |---. child .-> NULL
80
81 Bundles are cached at xrfm_policy struct (field ->bundles).
82
83
84 Resolution of xrfm_tmpl
85 -----------------------
86 Template contains:
87 1. ->mode Mode: transport or tunnel
88 2. ->id.proto Protocol: AH/ESP/IPCOMP
89 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
90 Q: allow to resolve security gateway?
91 4. ->id.spi If not zero, static SPI.
92 5. ->saddr Local tunnel endpoint, ignored for transport mode.
93 6. ->algos List of allowed algos. Plain bitmask now.
94 Q: ealgos, aalgos, calgos. What a mess...
95 7. ->share Sharing mode.
96 Q: how to implement private sharing mode? To add struct sock* to
97 flow id?
98
99 Having this template we search through SAD searching for entries
100 with appropriate mode/proto/algo, permitted by selector.
101 If no appropriate entry found, it is requested from key manager.
102
103 PROBLEMS:
104 Q: How to find all the bundles referring to a physical path for
105 PMTU discovery? Seems, dst should contain list of all parents...
106 and enter to infinite locking hierarchy disaster.
107 No! It is easier, we will not search for them, let them find us.
108 We add genid to each dst plus pointer to genid of raw IP route,
109 pmtu disc will update pmtu on raw IP route and increase its genid.
110 dst_check() will see this for top level and trigger resyncing
111 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
112 */
113
114struct xfrm_state_walk {
115 struct list_head all;
116 u8 state;
117 u8 dying;
118 u8 proto;
119 u32 seq;
120 struct xfrm_address_filter *filter;
121};
122
123/* Full description of state of transformer. */
124struct xfrm_state {
125 possible_net_t xs_net;
126 union {
127 struct hlist_node gclist;
128 struct hlist_node bydst;
129 };
130 struct hlist_node bysrc;
131 struct hlist_node byspi;
132
133 atomic_t refcnt;
134 spinlock_t lock;
135
136 struct xfrm_id id;
137 struct xfrm_selector sel;
138 struct xfrm_mark mark;
139 u32 tfcpad;
140
141 u32 genid;
142
143 /* Key manager bits */
144 struct xfrm_state_walk km;
145
146 /* Parameters of this state. */
147 struct {
148 u32 reqid;
149 u8 mode;
150 u8 replay_window;
151 u8 aalgo, ealgo, calgo;
152 u8 flags;
153 u16 family;
154 xfrm_address_t saddr;
155 int header_len;
156 int trailer_len;
157 u32 extra_flags;
158 } props;
159
160 struct xfrm_lifetime_cfg lft;
161
162 /* Data for transformer */
163 struct xfrm_algo_auth *aalg;
164 struct xfrm_algo *ealg;
165 struct xfrm_algo *calg;
166 struct xfrm_algo_aead *aead;
167 const char *geniv;
168
169 /* Data for encapsulator */
170 struct xfrm_encap_tmpl *encap;
171
172 /* Data for care-of address */
173 xfrm_address_t *coaddr;
174
175 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
176 struct xfrm_state *tunnel;
177
178 /* If a tunnel, number of users + 1 */
179 atomic_t tunnel_users;
180
181 /* State for replay detection */
182 struct xfrm_replay_state replay;
183 struct xfrm_replay_state_esn *replay_esn;
184
185 /* Replay detection state at the time we sent the last notification */
186 struct xfrm_replay_state preplay;
187 struct xfrm_replay_state_esn *preplay_esn;
188
189 /* The functions for replay detection. */
190 const struct xfrm_replay *repl;
191
192 /* internal flag that only holds state for delayed aevent at the
193 * moment
194 */
195 u32 xflags;
196
197 /* Replay detection notification settings */
198 u32 replay_maxage;
199 u32 replay_maxdiff;
200
201 /* Replay detection notification timer */
202 struct timer_list rtimer;
203
204 /* Statistics */
205 struct xfrm_stats stats;
206
207 struct xfrm_lifetime_cur curlft;
208 struct tasklet_hrtimer mtimer;
209
210 /* used to fix curlft->add_time when changing date */
211 long saved_tmo;
212
213 /* Last used time */
214 unsigned long lastused;
215
216 /* Reference to data common to all the instances of this
217 * transformer. */
218 const struct xfrm_type *type;
219 struct xfrm_mode *inner_mode;
220 struct xfrm_mode *inner_mode_iaf;
221 struct xfrm_mode *outer_mode;
222
223 /* Security context */
224 struct xfrm_sec_ctx *security;
225
226 /* Private data of this transformer, format is opaque,
227 * interpreted by xfrm_type methods. */
228 void *data;
229};
230
231static inline struct net *xs_net(struct xfrm_state *x)
232{
233 return read_pnet(&x->xs_net);
234}
235
236/* xflags - make enum if more show up */
237#define XFRM_TIME_DEFER 1
238#define XFRM_SOFT_EXPIRE 2
239
240enum {
241 XFRM_STATE_VOID,
242 XFRM_STATE_ACQ,
243 XFRM_STATE_VALID,
244 XFRM_STATE_ERROR,
245 XFRM_STATE_EXPIRED,
246 XFRM_STATE_DEAD
247};
248
249/* callback structure passed from either netlink or pfkey */
250struct km_event {
251 union {
252 u32 hard;
253 u32 proto;
254 u32 byid;
255 u32 aevent;
256 u32 type;
257 } data;
258
259 u32 seq;
260 u32 portid;
261 u32 event;
262 struct net *net;
263};
264
265struct xfrm_replay {
266 void (*advance)(struct xfrm_state *x, __be32 net_seq);
267 int (*check)(struct xfrm_state *x,
268 struct sk_buff *skb,
269 __be32 net_seq);
270 int (*recheck)(struct xfrm_state *x,
271 struct sk_buff *skb,
272 __be32 net_seq);
273 void (*notify)(struct xfrm_state *x, int event);
274 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
275};
276
277struct net_device;
278struct xfrm_type;
279struct xfrm_dst;
280struct xfrm_policy_afinfo {
281 unsigned short family;
282 struct dst_ops *dst_ops;
283 void (*garbage_collect)(struct net *net);
284 struct dst_entry *(*dst_lookup)(struct net *net,
285 int tos, int oif,
286 const xfrm_address_t *saddr,
287 const xfrm_address_t *daddr);
288 int (*get_saddr)(struct net *net, int oif,
289 xfrm_address_t *saddr,
290 xfrm_address_t *daddr);
291 void (*decode_session)(struct sk_buff *skb,
292 struct flowi *fl,
293 int reverse);
294 int (*get_tos)(const struct flowi *fl);
295 int (*init_path)(struct xfrm_dst *path,
296 struct dst_entry *dst,
297 int nfheader_len);
298 int (*fill_dst)(struct xfrm_dst *xdst,
299 struct net_device *dev,
300 const struct flowi *fl);
301 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
302};
303
304int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
305int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
306void km_policy_notify(struct xfrm_policy *xp, int dir,
307 const struct km_event *c);
308void km_state_notify(struct xfrm_state *x, const struct km_event *c);
309
310struct xfrm_tmpl;
311int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
312 struct xfrm_policy *pol);
313void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
314int __xfrm_state_delete(struct xfrm_state *x);
315
316struct xfrm_state_afinfo {
317 unsigned int family;
318 unsigned int proto;
319 __be16 eth_proto;
320 struct module *owner;
321 const struct xfrm_type *type_map[IPPROTO_MAX];
322 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
323 int (*init_flags)(struct xfrm_state *x);
324 void (*init_tempsel)(struct xfrm_selector *sel,
325 const struct flowi *fl);
326 void (*init_temprop)(struct xfrm_state *x,
327 const struct xfrm_tmpl *tmpl,
328 const xfrm_address_t *daddr,
329 const xfrm_address_t *saddr);
330 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
331 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
332 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
333 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
334 int (*extract_input)(struct xfrm_state *x,
335 struct sk_buff *skb);
336 int (*extract_output)(struct xfrm_state *x,
337 struct sk_buff *skb);
338 int (*transport_finish)(struct sk_buff *skb,
339 int async);
340 void (*local_error)(struct sk_buff *skb, u32 mtu);
341};
342
343int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
344int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
345struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
346void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
347
348struct xfrm_input_afinfo {
349 unsigned int family;
350 struct module *owner;
351 int (*callback)(struct sk_buff *skb, u8 protocol,
352 int err);
353};
354
355int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
356int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
357
358void xfrm_state_delete_tunnel(struct xfrm_state *x);
359
360struct xfrm_type {
361 char *description;
362 struct module *owner;
363 u8 proto;
364 u8 flags;
365#define XFRM_TYPE_NON_FRAGMENT 1
366#define XFRM_TYPE_REPLAY_PROT 2
367#define XFRM_TYPE_LOCAL_COADDR 4
368#define XFRM_TYPE_REMOTE_COADDR 8
369
370 int (*init_state)(struct xfrm_state *x);
371 void (*destructor)(struct xfrm_state *);
372 int (*input)(struct xfrm_state *, struct sk_buff *skb);
373 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
374 int (*reject)(struct xfrm_state *, struct sk_buff *,
375 const struct flowi *);
376 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
377 /* Estimate maximal size of result of transformation of a dgram */
378 u32 (*get_mtu)(struct xfrm_state *, int size);
379};
380
381int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
382int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
383
384struct xfrm_mode {
385 /*
386 * Remove encapsulation header.
387 *
388 * The IP header will be moved over the top of the encapsulation
389 * header.
390 *
391 * On entry, the transport header shall point to where the IP header
392 * should be and the network header shall be set to where the IP
393 * header currently is. skb->data shall point to the start of the
394 * payload.
395 */
396 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
397
398 /*
399 * This is the actual input entry point.
400 *
401 * For transport mode and equivalent this would be identical to
402 * input2 (which does not need to be set). While tunnel mode
403 * and equivalent would set this to the tunnel encapsulation function
404 * xfrm4_prepare_input that would in turn call input2.
405 */
406 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
407
408 /*
409 * Add encapsulation header.
410 *
411 * On exit, the transport header will be set to the start of the
412 * encapsulation header to be filled in by x->type->output and
413 * the mac header will be set to the nextheader (protocol for
414 * IPv4) field of the extension header directly preceding the
415 * encapsulation header, or in its absence, that of the top IP
416 * header. The value of the network header will always point
417 * to the top IP header while skb->data will point to the payload.
418 */
419 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
420
421 /*
422 * This is the actual output entry point.
423 *
424 * For transport mode and equivalent this would be identical to
425 * output2 (which does not need to be set). While tunnel mode
426 * and equivalent would set this to a tunnel encapsulation function
427 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
428 * call output2.
429 */
430 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
431
432 struct xfrm_state_afinfo *afinfo;
433 struct module *owner;
434 unsigned int encap;
435 int flags;
436};
437
438/* Flags for xfrm_mode. */
439enum {
440 XFRM_MODE_FLAG_TUNNEL = 1,
441};
442
443int xfrm_register_mode(struct xfrm_mode *mode, int family);
444int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
445
446static inline int xfrm_af2proto(unsigned int family)
447{
448 switch(family) {
449 case AF_INET:
450 return IPPROTO_IPIP;
451 case AF_INET6:
452 return IPPROTO_IPV6;
453 default:
454 return 0;
455 }
456}
457
458static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
459{
460 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
461 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
462 return x->inner_mode;
463 else
464 return x->inner_mode_iaf;
465}
466
467struct xfrm_tmpl {
468/* id in template is interpreted as:
469 * daddr - destination of tunnel, may be zero for transport mode.
470 * spi - zero to acquire spi. Not zero if spi is static, then
471 * daddr must be fixed too.
472 * proto - AH/ESP/IPCOMP
473 */
474 struct xfrm_id id;
475
476/* Source address of tunnel. Ignored, if it is not a tunnel. */
477 xfrm_address_t saddr;
478
479 unsigned short encap_family;
480
481 u32 reqid;
482
483/* Mode: transport, tunnel etc. */
484 u8 mode;
485
486/* Sharing mode: unique, this session only, this user only etc. */
487 u8 share;
488
489/* May skip this transfomration if no SA is found */
490 u8 optional;
491
492/* Skip aalgos/ealgos/calgos checks. */
493 u8 allalgs;
494
495/* Bit mask of algos allowed for acquisition */
496 u32 aalgos;
497 u32 ealgos;
498 u32 calgos;
499};
500
501#define XFRM_MAX_DEPTH 6
502
503struct xfrm_policy_walk_entry {
504 struct list_head all;
505 u8 dead;
506};
507
508struct xfrm_policy_walk {
509 struct xfrm_policy_walk_entry walk;
510 u8 type;
511 u32 seq;
512};
513
514struct xfrm_policy_queue {
515 struct sk_buff_head hold_queue;
516 struct timer_list hold_timer;
517 unsigned long timeout;
518};
519
520struct xfrm_policy {
521 possible_net_t xp_net;
522 struct hlist_node bydst;
523 struct hlist_node byidx;
524
525 /* This lock only affects elements except for entry. */
526 rwlock_t lock;
527 atomic_t refcnt;
528 struct timer_list timer;
529
530 struct flow_cache_object flo;
531 atomic_t genid;
532 u32 priority;
533 u32 index;
534 struct xfrm_mark mark;
535 struct xfrm_selector selector;
536 struct xfrm_lifetime_cfg lft;
537 struct xfrm_lifetime_cur curlft;
538 struct xfrm_policy_walk_entry walk;
539 struct xfrm_policy_queue polq;
540 u8 type;
541 u8 action;
542 u8 flags;
543 u8 xfrm_nr;
544 u16 family;
545 struct xfrm_sec_ctx *security;
546 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
547 struct rcu_head rcu;
548};
549
550static inline struct net *xp_net(const struct xfrm_policy *xp)
551{
552 return read_pnet(&xp->xp_net);
553}
554
555struct xfrm_kmaddress {
556 xfrm_address_t local;
557 xfrm_address_t remote;
558 u32 reserved;
559 u16 family;
560};
561
562struct xfrm_migrate {
563 xfrm_address_t old_daddr;
564 xfrm_address_t old_saddr;
565 xfrm_address_t new_daddr;
566 xfrm_address_t new_saddr;
567 u8 proto;
568 u8 mode;
569 u16 reserved;
570 u32 reqid;
571 u16 old_family;
572 u16 new_family;
573};
574
575#define XFRM_KM_TIMEOUT 30
576/* what happened */
577#define XFRM_REPLAY_UPDATE XFRM_AE_CR
578#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
579
580/* default aevent timeout in units of 100ms */
581#define XFRM_AE_ETIME 10
582/* Async Event timer multiplier */
583#define XFRM_AE_ETH_M 10
584/* default seq threshold size */
585#define XFRM_AE_SEQT_SIZE 2
586
587struct xfrm_mgr {
588 struct list_head list;
589 char *id;
590 int (*notify)(struct xfrm_state *x, const struct km_event *c);
591 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
592 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
593 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
594 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
595 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
596 int (*migrate)(const struct xfrm_selector *sel,
597 u8 dir, u8 type,
598 const struct xfrm_migrate *m,
599 int num_bundles,
600 const struct xfrm_kmaddress *k);
601 bool (*is_alive)(const struct km_event *c);
602};
603
604int xfrm_register_km(struct xfrm_mgr *km);
605int xfrm_unregister_km(struct xfrm_mgr *km);
606
607struct xfrm_tunnel_skb_cb {
608 union {
609 struct inet_skb_parm h4;
610 struct inet6_skb_parm h6;
611 } header;
612
613 union {
614 struct ip_tunnel *ip4;
615 struct ip6_tnl *ip6;
616 } tunnel;
617};
618
619#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
620
621/*
622 * This structure is used for the duration where packets are being
623 * transformed by IPsec. As soon as the packet leaves IPsec the
624 * area beyond the generic IP part may be overwritten.
625 */
626struct xfrm_skb_cb {
627 struct xfrm_tunnel_skb_cb header;
628
629 /* Sequence number for replay protection. */
630 union {
631 struct {
632 __u32 low;
633 __u32 hi;
634 } output;
635 struct {
636 __be32 low;
637 __be32 hi;
638 } input;
639 } seq;
640};
641
642#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
643
644/*
645 * This structure is used by the afinfo prepare_input/prepare_output functions
646 * to transmit header information to the mode input/output functions.
647 */
648struct xfrm_mode_skb_cb {
649 struct xfrm_tunnel_skb_cb header;
650
651 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
652 __be16 id;
653 __be16 frag_off;
654
655 /* IP header length (excluding options or extension headers). */
656 u8 ihl;
657
658 /* TOS for IPv4, class for IPv6. */
659 u8 tos;
660
661 /* TTL for IPv4, hop limitfor IPv6. */
662 u8 ttl;
663
664 /* Protocol for IPv4, NH for IPv6. */
665 u8 protocol;
666
667 /* Option length for IPv4, zero for IPv6. */
668 u8 optlen;
669
670 /* Used by IPv6 only, zero for IPv4. */
671 u8 flow_lbl[3];
672};
673
674#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
675
676/*
677 * This structure is used by the input processing to locate the SPI and
678 * related information.
679 */
680struct xfrm_spi_skb_cb {
681 struct xfrm_tunnel_skb_cb header;
682
683 unsigned int daddroff;
684 unsigned int family;
685};
686
687#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
688
689#ifdef CONFIG_AUDITSYSCALL
690static inline struct audit_buffer *xfrm_audit_start(const char *op)
691{
692 struct audit_buffer *audit_buf = NULL;
693
694 if (audit_enabled == 0)
695 return NULL;
696 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
697 AUDIT_MAC_IPSEC_EVENT);
698 if (audit_buf == NULL)
699 return NULL;
700 audit_log_format(audit_buf, "op=%s", op);
701 return audit_buf;
702}
703
704static inline void xfrm_audit_helper_usrinfo(bool task_valid,
705 struct audit_buffer *audit_buf)
706{
707 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
708 audit_get_loginuid(current) :
709 INVALID_UID);
710 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
711 (unsigned int) -1;
712
713 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
714 audit_log_task_context(audit_buf);
715}
716
717void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
718void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
719 bool task_valid);
720void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
721void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
722void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
723 struct sk_buff *skb);
724void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
725 __be32 net_seq);
726void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
727void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
728 __be32 net_seq);
729void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
730 u8 proto);
731#else
732
733static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
734 bool task_valid)
735{
736}
737
738static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
739 bool task_valid)
740{
741}
742
743static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
744 bool task_valid)
745{
746}
747
748static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
749 bool task_valid)
750{
751}
752
753static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
754 struct sk_buff *skb)
755{
756}
757
758static inline void xfrm_audit_state_replay(struct xfrm_state *x,
759 struct sk_buff *skb, __be32 net_seq)
760{
761}
762
763static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
764 u16 family)
765{
766}
767
768static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
769 __be32 net_spi, __be32 net_seq)
770{
771}
772
773static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
774 struct sk_buff *skb, u8 proto)
775{
776}
777#endif /* CONFIG_AUDITSYSCALL */
778
779static inline void xfrm_pol_hold(struct xfrm_policy *policy)
780{
781 if (likely(policy != NULL))
782 atomic_inc(&policy->refcnt);
783}
784
785void xfrm_policy_destroy(struct xfrm_policy *policy);
786
787static inline void xfrm_pol_put(struct xfrm_policy *policy)
788{
789 if (atomic_dec_and_test(&policy->refcnt))
790 xfrm_policy_destroy(policy);
791}
792
793static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
794{
795 int i;
796 for (i = npols - 1; i >= 0; --i)
797 xfrm_pol_put(pols[i]);
798}
799
800void __xfrm_state_destroy(struct xfrm_state *);
801
802static inline void __xfrm_state_put(struct xfrm_state *x)
803{
804 atomic_dec(&x->refcnt);
805}
806
807static inline void xfrm_state_put(struct xfrm_state *x)
808{
809 if (atomic_dec_and_test(&x->refcnt))
810 __xfrm_state_destroy(x);
811}
812
813static inline void xfrm_state_hold(struct xfrm_state *x)
814{
815 atomic_inc(&x->refcnt);
816}
817
818static inline bool addr_match(const void *token1, const void *token2,
819 int prefixlen)
820{
821 const __be32 *a1 = token1;
822 const __be32 *a2 = token2;
823 int pdw;
824 int pbi;
825
826 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
827 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
828
829 if (pdw)
830 if (memcmp(a1, a2, pdw << 2))
831 return false;
832
833 if (pbi) {
834 __be32 mask;
835
836 mask = htonl((0xffffffff) << (32 - pbi));
837
838 if ((a1[pdw] ^ a2[pdw]) & mask)
839 return false;
840 }
841
842 return true;
843}
844
845static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
846{
847 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
848 if (prefixlen == 0)
849 return true;
850 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
851}
852
853static __inline__
854__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
855{
856 __be16 port;
857 switch(fl->flowi_proto) {
858 case IPPROTO_TCP:
859 case IPPROTO_UDP:
860 case IPPROTO_UDPLITE:
861 case IPPROTO_SCTP:
862 port = uli->ports.sport;
863 break;
864 case IPPROTO_ICMP:
865 case IPPROTO_ICMPV6:
866 port = htons(uli->icmpt.type);
867 break;
868 case IPPROTO_MH:
869 port = htons(uli->mht.type);
870 break;
871 case IPPROTO_GRE:
872 port = htons(ntohl(uli->gre_key) >> 16);
873 break;
874 default:
875 port = 0; /*XXX*/
876 }
877 return port;
878}
879
880static __inline__
881__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
882{
883 __be16 port;
884 switch(fl->flowi_proto) {
885 case IPPROTO_TCP:
886 case IPPROTO_UDP:
887 case IPPROTO_UDPLITE:
888 case IPPROTO_SCTP:
889 port = uli->ports.dport;
890 break;
891 case IPPROTO_ICMP:
892 case IPPROTO_ICMPV6:
893 port = htons(uli->icmpt.code);
894 break;
895 case IPPROTO_GRE:
896 port = htons(ntohl(uli->gre_key) & 0xffff);
897 break;
898 default:
899 port = 0; /*XXX*/
900 }
901 return port;
902}
903
904bool xfrm_selector_match(const struct xfrm_selector *sel,
905 const struct flowi *fl, unsigned short family);
906
907#ifdef CONFIG_SECURITY_NETWORK_XFRM
908/* If neither has a context --> match
909 * Otherwise, both must have a context and the sids, doi, alg must match
910 */
911static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
912{
913 return ((!s1 && !s2) ||
914 (s1 && s2 &&
915 (s1->ctx_sid == s2->ctx_sid) &&
916 (s1->ctx_doi == s2->ctx_doi) &&
917 (s1->ctx_alg == s2->ctx_alg)));
918}
919#else
920static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
921{
922 return true;
923}
924#endif
925
926/* A struct encoding bundle of transformations to apply to some set of flow.
927 *
928 * dst->child points to the next element of bundle.
929 * dst->xfrm points to an instanse of transformer.
930 *
931 * Due to unfortunate limitations of current routing cache, which we
932 * have no time to fix, it mirrors struct rtable and bound to the same
933 * routing key, including saddr,daddr. However, we can have many of
934 * bundles differing by session id. All the bundles grow from a parent
935 * policy rule.
936 */
937struct xfrm_dst {
938 union {
939 struct dst_entry dst;
940 struct rtable rt;
941 struct rt6_info rt6;
942 } u;
943 struct dst_entry *route;
944 struct flow_cache_object flo;
945 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
946 int num_pols, num_xfrms;
947#ifdef CONFIG_XFRM_SUB_POLICY
948 struct flowi *origin;
949 struct xfrm_selector *partner;
950#endif
951 u32 xfrm_genid;
952 u32 policy_genid;
953 u32 route_mtu_cached;
954 u32 child_mtu_cached;
955 u32 route_cookie;
956 u32 path_cookie;
957};
958
959#ifdef CONFIG_XFRM
960static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
961{
962 xfrm_pols_put(xdst->pols, xdst->num_pols);
963 dst_release(xdst->route);
964 if (likely(xdst->u.dst.xfrm))
965 xfrm_state_put(xdst->u.dst.xfrm);
966#ifdef CONFIG_XFRM_SUB_POLICY
967 kfree(xdst->origin);
968 xdst->origin = NULL;
969 kfree(xdst->partner);
970 xdst->partner = NULL;
971#endif
972}
973#endif
974
975void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
976
977struct sec_path {
978 atomic_t refcnt;
979 int len;
980 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
981};
982
983static inline int secpath_exists(struct sk_buff *skb)
984{
985#ifdef CONFIG_XFRM
986 return skb->sp != NULL;
987#else
988 return 0;
989#endif
990}
991
992static inline struct sec_path *
993secpath_get(struct sec_path *sp)
994{
995 if (sp)
996 atomic_inc(&sp->refcnt);
997 return sp;
998}
999
1000void __secpath_destroy(struct sec_path *sp);
1001
1002static inline void
1003secpath_put(struct sec_path *sp)
1004{
1005 if (sp && atomic_dec_and_test(&sp->refcnt))
1006 __secpath_destroy(sp);
1007}
1008
1009struct sec_path *secpath_dup(struct sec_path *src);
1010
1011static inline void
1012secpath_reset(struct sk_buff *skb)
1013{
1014#ifdef CONFIG_XFRM
1015 secpath_put(skb->sp);
1016 skb->sp = NULL;
1017#endif
1018}
1019
1020static inline int
1021xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1022{
1023 switch (family) {
1024 case AF_INET:
1025 return addr->a4 == 0;
1026 case AF_INET6:
1027 return ipv6_addr_any(&addr->in6);
1028 }
1029 return 0;
1030}
1031
1032static inline int
1033__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1034{
1035 return (tmpl->saddr.a4 &&
1036 tmpl->saddr.a4 != x->props.saddr.a4);
1037}
1038
1039static inline int
1040__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1041{
1042 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1043 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1044}
1045
1046static inline int
1047xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1048{
1049 switch (family) {
1050 case AF_INET:
1051 return __xfrm4_state_addr_cmp(tmpl, x);
1052 case AF_INET6:
1053 return __xfrm6_state_addr_cmp(tmpl, x);
1054 }
1055 return !0;
1056}
1057
1058#ifdef CONFIG_XFRM
1059int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1060 unsigned short family);
1061
1062static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1063 struct sk_buff *skb,
1064 unsigned int family, int reverse)
1065{
1066 struct net *net = dev_net(skb->dev);
1067 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1068
1069 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1070 return __xfrm_policy_check(sk, ndir, skb, family);
1071
1072 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1073 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1074 __xfrm_policy_check(sk, ndir, skb, family);
1075}
1076
1077static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1078{
1079 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1080}
1081
1082static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1083{
1084 return xfrm_policy_check(sk, dir, skb, AF_INET);
1085}
1086
1087static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1088{
1089 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1090}
1091
1092static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1093 struct sk_buff *skb)
1094{
1095 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1096}
1097
1098static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1099 struct sk_buff *skb)
1100{
1101 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1102}
1103
1104int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1105 unsigned int family, int reverse);
1106
1107static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1108 unsigned int family)
1109{
1110 return __xfrm_decode_session(skb, fl, family, 0);
1111}
1112
1113static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1114 struct flowi *fl,
1115 unsigned int family)
1116{
1117 return __xfrm_decode_session(skb, fl, family, 1);
1118}
1119
1120int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1121
1122static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1123{
1124 struct net *net = dev_net(skb->dev);
1125
1126 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1127 (skb_dst(skb)->flags & DST_NOXFRM) ||
1128 __xfrm_route_forward(skb, family);
1129}
1130
1131static inline int xfrm4_route_forward(struct sk_buff *skb)
1132{
1133 return xfrm_route_forward(skb, AF_INET);
1134}
1135
1136static inline int xfrm6_route_forward(struct sk_buff *skb)
1137{
1138 return xfrm_route_forward(skb, AF_INET6);
1139}
1140
1141int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1142
1143static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1144{
1145 sk->sk_policy[0] = NULL;
1146 sk->sk_policy[1] = NULL;
1147 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1148 return __xfrm_sk_clone_policy(sk, osk);
1149 return 0;
1150}
1151
1152int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1153
1154static inline void xfrm_sk_free_policy(struct sock *sk)
1155{
1156 struct xfrm_policy *pol;
1157
1158 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1159 if (unlikely(pol != NULL)) {
1160 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1161 sk->sk_policy[0] = NULL;
1162 }
1163 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1164 if (unlikely(pol != NULL)) {
1165 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1166 sk->sk_policy[1] = NULL;
1167 }
1168}
1169
1170void xfrm_garbage_collect(struct net *net);
1171
1172#else
1173
1174static inline void xfrm_sk_free_policy(struct sock *sk) {}
1175static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1176static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1177static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1178static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1179{
1180 return 1;
1181}
1182static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1183{
1184 return 1;
1185}
1186static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1187{
1188 return 1;
1189}
1190static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1191 struct flowi *fl,
1192 unsigned int family)
1193{
1194 return -ENOSYS;
1195}
1196static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1197 struct sk_buff *skb)
1198{
1199 return 1;
1200}
1201static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1202 struct sk_buff *skb)
1203{
1204 return 1;
1205}
1206static inline void xfrm_garbage_collect(struct net *net)
1207{
1208}
1209#endif
1210
1211static __inline__
1212xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1213{
1214 switch (family){
1215 case AF_INET:
1216 return (xfrm_address_t *)&fl->u.ip4.daddr;
1217 case AF_INET6:
1218 return (xfrm_address_t *)&fl->u.ip6.daddr;
1219 }
1220 return NULL;
1221}
1222
1223static __inline__
1224xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1225{
1226 switch (family){
1227 case AF_INET:
1228 return (xfrm_address_t *)&fl->u.ip4.saddr;
1229 case AF_INET6:
1230 return (xfrm_address_t *)&fl->u.ip6.saddr;
1231 }
1232 return NULL;
1233}
1234
1235static __inline__
1236void xfrm_flowi_addr_get(const struct flowi *fl,
1237 xfrm_address_t *saddr, xfrm_address_t *daddr,
1238 unsigned short family)
1239{
1240 switch(family) {
1241 case AF_INET:
1242 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1243 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1244 break;
1245 case AF_INET6:
1246 saddr->in6 = fl->u.ip6.saddr;
1247 daddr->in6 = fl->u.ip6.daddr;
1248 break;
1249 }
1250}
1251
1252static __inline__ int
1253__xfrm4_state_addr_check(const struct xfrm_state *x,
1254 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1255{
1256 if (daddr->a4 == x->id.daddr.a4 &&
1257 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1258 return 1;
1259 return 0;
1260}
1261
1262static __inline__ int
1263__xfrm6_state_addr_check(const struct xfrm_state *x,
1264 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1265{
1266 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1267 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1268 ipv6_addr_any((struct in6_addr *)saddr) ||
1269 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1270 return 1;
1271 return 0;
1272}
1273
1274static __inline__ int
1275xfrm_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1277 unsigned short family)
1278{
1279 switch (family) {
1280 case AF_INET:
1281 return __xfrm4_state_addr_check(x, daddr, saddr);
1282 case AF_INET6:
1283 return __xfrm6_state_addr_check(x, daddr, saddr);
1284 }
1285 return 0;
1286}
1287
1288static __inline__ int
1289xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1290 unsigned short family)
1291{
1292 switch (family) {
1293 case AF_INET:
1294 return __xfrm4_state_addr_check(x,
1295 (const xfrm_address_t *)&fl->u.ip4.daddr,
1296 (const xfrm_address_t *)&fl->u.ip4.saddr);
1297 case AF_INET6:
1298 return __xfrm6_state_addr_check(x,
1299 (const xfrm_address_t *)&fl->u.ip6.daddr,
1300 (const xfrm_address_t *)&fl->u.ip6.saddr);
1301 }
1302 return 0;
1303}
1304
1305static inline int xfrm_state_kern(const struct xfrm_state *x)
1306{
1307 return atomic_read(&x->tunnel_users);
1308}
1309
1310static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1311{
1312 return (!userproto || proto == userproto ||
1313 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1314 proto == IPPROTO_ESP ||
1315 proto == IPPROTO_COMP)));
1316}
1317
1318/*
1319 * xfrm algorithm information
1320 */
1321struct xfrm_algo_aead_info {
1322 char *geniv;
1323 u16 icv_truncbits;
1324};
1325
1326struct xfrm_algo_auth_info {
1327 u16 icv_truncbits;
1328 u16 icv_fullbits;
1329};
1330
1331struct xfrm_algo_encr_info {
1332 char *geniv;
1333 u16 blockbits;
1334 u16 defkeybits;
1335};
1336
1337struct xfrm_algo_comp_info {
1338 u16 threshold;
1339};
1340
1341struct xfrm_algo_desc {
1342 char *name;
1343 char *compat;
1344 u8 available:1;
1345 u8 pfkey_supported:1;
1346 union {
1347 struct xfrm_algo_aead_info aead;
1348 struct xfrm_algo_auth_info auth;
1349 struct xfrm_algo_encr_info encr;
1350 struct xfrm_algo_comp_info comp;
1351 } uinfo;
1352 struct sadb_alg desc;
1353};
1354
1355/* XFRM protocol handlers. */
1356struct xfrm4_protocol {
1357 int (*handler)(struct sk_buff *skb);
1358 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1359 int encap_type);
1360 int (*cb_handler)(struct sk_buff *skb, int err);
1361 int (*err_handler)(struct sk_buff *skb, u32 info);
1362
1363 struct xfrm4_protocol __rcu *next;
1364 int priority;
1365};
1366
1367struct xfrm6_protocol {
1368 int (*handler)(struct sk_buff *skb);
1369 int (*cb_handler)(struct sk_buff *skb, int err);
1370 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1371 u8 type, u8 code, int offset, __be32 info);
1372
1373 struct xfrm6_protocol __rcu *next;
1374 int priority;
1375};
1376
1377/* XFRM tunnel handlers. */
1378struct xfrm_tunnel {
1379 int (*handler)(struct sk_buff *skb);
1380 int (*err_handler)(struct sk_buff *skb, u32 info);
1381
1382 struct xfrm_tunnel __rcu *next;
1383 int priority;
1384};
1385
1386struct xfrm6_tunnel {
1387 int (*handler)(struct sk_buff *skb);
1388 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1389 u8 type, u8 code, int offset, __be32 info);
1390 struct xfrm6_tunnel __rcu *next;
1391 int priority;
1392};
1393
1394void xfrm_init(void);
1395void xfrm4_init(void);
1396int xfrm_state_init(struct net *net);
1397void xfrm_state_fini(struct net *net);
1398void xfrm4_state_init(void);
1399void xfrm4_protocol_init(void);
1400#ifdef CONFIG_XFRM
1401int xfrm6_init(void);
1402void xfrm6_fini(void);
1403int xfrm6_state_init(void);
1404void xfrm6_state_fini(void);
1405int xfrm6_protocol_init(void);
1406void xfrm6_protocol_fini(void);
1407#else
1408static inline int xfrm6_init(void)
1409{
1410 return 0;
1411}
1412static inline void xfrm6_fini(void)
1413{
1414 ;
1415}
1416#endif
1417
1418#ifdef CONFIG_XFRM_STATISTICS
1419int xfrm_proc_init(struct net *net);
1420void xfrm_proc_fini(struct net *net);
1421#endif
1422
1423int xfrm_sysctl_init(struct net *net);
1424#ifdef CONFIG_SYSCTL
1425void xfrm_sysctl_fini(struct net *net);
1426#else
1427static inline void xfrm_sysctl_fini(struct net *net)
1428{
1429}
1430#endif
1431
1432void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1433 struct xfrm_address_filter *filter);
1434int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1435 int (*func)(struct xfrm_state *, int, void*), void *);
1436void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1437struct xfrm_state *xfrm_state_alloc(struct net *net);
1438struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1439 const xfrm_address_t *saddr,
1440 const struct flowi *fl,
1441 struct xfrm_tmpl *tmpl,
1442 struct xfrm_policy *pol, int *err,
1443 unsigned short family);
1444struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1445 xfrm_address_t *daddr,
1446 xfrm_address_t *saddr,
1447 unsigned short family,
1448 u8 mode, u8 proto, u32 reqid);
1449struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1450 unsigned short family);
1451int xfrm_state_check_expire(struct xfrm_state *x);
1452void xfrm_state_insert(struct xfrm_state *x);
1453int xfrm_state_add(struct xfrm_state *x);
1454int xfrm_state_update(struct xfrm_state *x);
1455struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1456 const xfrm_address_t *daddr, __be32 spi,
1457 u8 proto, unsigned short family);
1458struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1459 const xfrm_address_t *daddr,
1460 const xfrm_address_t *saddr,
1461 u8 proto,
1462 unsigned short family);
1463#ifdef CONFIG_XFRM_SUB_POLICY
1464int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1465 unsigned short family, struct net *net);
1466int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1467 unsigned short family);
1468#else
1469static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1470 int n, unsigned short family, struct net *net)
1471{
1472 return -ENOSYS;
1473}
1474
1475static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1476 int n, unsigned short family)
1477{
1478 return -ENOSYS;
1479}
1480#endif
1481
1482struct xfrmk_sadinfo {
1483 u32 sadhcnt; /* current hash bkts */
1484 u32 sadhmcnt; /* max allowed hash bkts */
1485 u32 sadcnt; /* current running count */
1486};
1487
1488struct xfrmk_spdinfo {
1489 u32 incnt;
1490 u32 outcnt;
1491 u32 fwdcnt;
1492 u32 inscnt;
1493 u32 outscnt;
1494 u32 fwdscnt;
1495 u32 spdhcnt;
1496 u32 spdhmcnt;
1497};
1498
1499struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1500int xfrm_state_delete(struct xfrm_state *x);
1501int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1502void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1503void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1504u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1505int xfrm_init_replay(struct xfrm_state *x);
1506int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1507int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1508int xfrm_init_state(struct xfrm_state *x);
1509int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1510int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1511int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1512int xfrm_output_resume(struct sk_buff *skb, int err);
1513int xfrm_output(struct sock *sk, struct sk_buff *skb);
1514int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1515void xfrm_local_error(struct sk_buff *skb, int mtu);
1516int xfrm4_extract_header(struct sk_buff *skb);
1517int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1518int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1519 int encap_type);
1520int xfrm4_transport_finish(struct sk_buff *skb, int async);
1521int xfrm4_rcv(struct sk_buff *skb);
1522
1523static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1524{
1525 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1526 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1527 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1528 return xfrm_input(skb, nexthdr, spi, 0);
1529}
1530
1531int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1532int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1533int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1534int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1535int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1536int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1537int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1538int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1539int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1540void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1541int xfrm6_extract_header(struct sk_buff *skb);
1542int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1543int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1544 struct ip6_tnl *t);
1545int xfrm6_transport_finish(struct sk_buff *skb, int async);
1546int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1547int xfrm6_rcv(struct sk_buff *skb);
1548int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1549 xfrm_address_t *saddr, u8 proto);
1550void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1551int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1552int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1553int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1554int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1555int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1556__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1557__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1558int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1559int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1560int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1561int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1562int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1563 u8 **prevhdr);
1564
1565#ifdef CONFIG_XFRM
1566int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1567int xfrm_user_policy(struct sock *sk, int optname,
1568 u8 __user *optval, int optlen);
1569#else
1570static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1571{
1572 return -ENOPROTOOPT;
1573}
1574
1575static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1576{
1577 /* should not happen */
1578 kfree_skb(skb);
1579 return 0;
1580}
1581#endif
1582
1583struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1584
1585void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1586int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1587 int (*func)(struct xfrm_policy *, int, int, void*),
1588 void *);
1589void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1590int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1591struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1592 u8 type, int dir,
1593 struct xfrm_selector *sel,
1594 struct xfrm_sec_ctx *ctx, int delete,
1595 int *err);
1596struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1597 u32 id, int delete, int *err);
1598int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1599void xfrm_policy_hash_rebuild(struct net *net);
1600u32 xfrm_get_acqseq(void);
1601int verify_spi_info(u8 proto, u32 min, u32 max);
1602int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1603struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1604 u8 mode, u32 reqid, u8 proto,
1605 const xfrm_address_t *daddr,
1606 const xfrm_address_t *saddr, int create,
1607 unsigned short family);
1608int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1609
1610#ifdef CONFIG_XFRM_MIGRATE
1611int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1612 const struct xfrm_migrate *m, int num_bundles,
1613 const struct xfrm_kmaddress *k);
1614struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1615struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1616 struct xfrm_migrate *m);
1617int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1618 struct xfrm_migrate *m, int num_bundles,
1619 struct xfrm_kmaddress *k, struct net *net);
1620#endif
1621
1622int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1623void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1624int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1625 xfrm_address_t *addr);
1626
1627void xfrm_input_init(void);
1628int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1629
1630void xfrm_probe_algs(void);
1631int xfrm_count_pfkey_auth_supported(void);
1632int xfrm_count_pfkey_enc_supported(void);
1633struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1634struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1635struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1636struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1637struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1638struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1639struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1640struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1641struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1642 int probe);
1643
1644static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1645 const xfrm_address_t *b)
1646{
1647 return ipv6_addr_equal((const struct in6_addr *)a,
1648 (const struct in6_addr *)b);
1649}
1650
1651static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1652 const xfrm_address_t *b,
1653 sa_family_t family)
1654{
1655 switch (family) {
1656 default:
1657 case AF_INET:
1658 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1659 case AF_INET6:
1660 return xfrm6_addr_equal(a, b);
1661 }
1662}
1663
1664static inline int xfrm_policy_id2dir(u32 index)
1665{
1666 return index & 7;
1667}
1668
1669#ifdef CONFIG_XFRM
1670static inline int xfrm_aevent_is_on(struct net *net)
1671{
1672 struct sock *nlsk;
1673 int ret = 0;
1674
1675 rcu_read_lock();
1676 nlsk = rcu_dereference(net->xfrm.nlsk);
1677 if (nlsk)
1678 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1679 rcu_read_unlock();
1680 return ret;
1681}
1682
1683static inline int xfrm_acquire_is_on(struct net *net)
1684{
1685 struct sock *nlsk;
1686 int ret = 0;
1687
1688 rcu_read_lock();
1689 nlsk = rcu_dereference(net->xfrm.nlsk);
1690 if (nlsk)
1691 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1692 rcu_read_unlock();
1693
1694 return ret;
1695}
1696#endif
1697
1698static inline int aead_len(struct xfrm_algo_aead *alg)
1699{
1700 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1701}
1702
1703static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1704{
1705 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1706}
1707
1708static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1709{
1710 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1711}
1712
1713static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1714{
1715 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1716}
1717
1718#ifdef CONFIG_XFRM_MIGRATE
1719static inline int xfrm_replay_clone(struct xfrm_state *x,
1720 struct xfrm_state *orig)
1721{
1722 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1723 GFP_KERNEL);
1724 if (!x->replay_esn)
1725 return -ENOMEM;
1726
1727 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1728 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1729
1730 x->preplay_esn = kmemdup(x->replay_esn,
1731 xfrm_replay_state_esn_len(x->replay_esn),
1732 GFP_KERNEL);
1733 if (!x->preplay_esn) {
1734 kfree(x->replay_esn);
1735 return -ENOMEM;
1736 }
1737
1738 return 0;
1739}
1740
1741static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1742{
1743 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1744}
1745
1746
1747static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1748{
1749 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1750}
1751
1752static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1753{
1754 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1755}
1756
1757static inline void xfrm_states_put(struct xfrm_state **states, int n)
1758{
1759 int i;
1760 for (i = 0; i < n; i++)
1761 xfrm_state_put(*(states + i));
1762}
1763
1764static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1765{
1766 int i;
1767 for (i = 0; i < n; i++)
1768 xfrm_state_delete(*(states + i));
1769}
1770#endif
1771
1772#ifdef CONFIG_XFRM
1773static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1774{
1775 return skb->sp->xvec[skb->sp->len - 1];
1776}
1777#endif
1778
1779static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1780{
1781 if (attrs[XFRMA_MARK])
1782 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1783 else
1784 m->v = m->m = 0;
1785
1786 return m->v & m->m;
1787}
1788
1789static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1790{
1791 int ret = 0;
1792
1793 if (m->m | m->v)
1794 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1795 return ret;
1796}
1797
1798static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1799 unsigned int family)
1800{
1801 bool tunnel = false;
1802
1803 switch(family) {
1804 case AF_INET:
1805 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1806 tunnel = true;
1807 break;
1808 case AF_INET6:
1809 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1810 tunnel = true;
1811 break;
1812 }
1813 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1814 return -EINVAL;
1815
1816 return 0;
1817}
1818#endif /* _NET_XFRM_H */