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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_XFRM_H
3#define _NET_XFRM_H
4
5#include <linux/compiler.h>
6#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/pfkeyv2.h>
12#include <linux/ipsec.h>
13#include <linux/in6.h>
14#include <linux/mutex.h>
15#include <linux/audit.h>
16#include <linux/slab.h>
17#include <linux/refcount.h>
18
19#include <net/sock.h>
20#include <net/dst.h>
21#include <net/ip.h>
22#include <net/route.h>
23#include <net/ipv6.h>
24#include <net/ip6_fib.h>
25#include <net/flow.h>
26
27#include <linux/interrupt.h>
28
29#ifdef CONFIG_XFRM_STATISTICS
30#include <net/snmp.h>
31#endif
32
33#define XFRM_PROTO_ESP 50
34#define XFRM_PROTO_AH 51
35#define XFRM_PROTO_COMP 108
36#define XFRM_PROTO_IPIP 4
37#define XFRM_PROTO_IPV6 41
38#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
39#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
40
41#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
42#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
43#define MODULE_ALIAS_XFRM_MODE(family, encap) \
44 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
45#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
46 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
47#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
49
50#ifdef CONFIG_XFRM_STATISTICS
51#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
52#else
53#define XFRM_INC_STATS(net, field) ((void)(net))
54#endif
55
56
57/* Organization of SPD aka "XFRM rules"
58 ------------------------------------
59
60 Basic objects:
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
65
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
70
71 Lookup is plain linear search until the first match with selector.
72
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
79
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
83 |---. child .-> NULL
84
85 Bundles are cached at xrfm_policy struct (field ->bundles).
86
87
88 Resolution of xrfm_tmpl
89 -----------------------
90 Template contains:
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
101 flow id?
102
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
106
107 PROBLEMS:
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116 */
117
118struct xfrm_state_walk {
119 struct list_head all;
120 u8 state;
121 u8 dying;
122 u8 proto;
123 u32 seq;
124 struct xfrm_address_filter *filter;
125};
126
127struct xfrm_state_offload {
128 struct net_device *dev;
129 unsigned long offload_handle;
130 unsigned int num_exthdrs;
131 u8 flags;
132};
133
134/* Full description of state of transformer. */
135struct xfrm_state {
136 possible_net_t xs_net;
137 union {
138 struct hlist_node gclist;
139 struct hlist_node bydst;
140 };
141 struct hlist_node bysrc;
142 struct hlist_node byspi;
143
144 refcount_t refcnt;
145 spinlock_t lock;
146
147 struct xfrm_id id;
148 struct xfrm_selector sel;
149 struct xfrm_mark mark;
150 u32 tfcpad;
151
152 u32 genid;
153
154 /* Key manager bits */
155 struct xfrm_state_walk km;
156
157 /* Parameters of this state. */
158 struct {
159 u32 reqid;
160 u8 mode;
161 u8 replay_window;
162 u8 aalgo, ealgo, calgo;
163 u8 flags;
164 u16 family;
165 xfrm_address_t saddr;
166 int header_len;
167 int trailer_len;
168 u32 extra_flags;
169 u32 output_mark;
170 } props;
171
172 struct xfrm_lifetime_cfg lft;
173
174 /* Data for transformer */
175 struct xfrm_algo_auth *aalg;
176 struct xfrm_algo *ealg;
177 struct xfrm_algo *calg;
178 struct xfrm_algo_aead *aead;
179 const char *geniv;
180
181 /* Data for encapsulator */
182 struct xfrm_encap_tmpl *encap;
183
184 /* Data for care-of address */
185 xfrm_address_t *coaddr;
186
187 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
188 struct xfrm_state *tunnel;
189
190 /* If a tunnel, number of users + 1 */
191 atomic_t tunnel_users;
192
193 /* State for replay detection */
194 struct xfrm_replay_state replay;
195 struct xfrm_replay_state_esn *replay_esn;
196
197 /* Replay detection state at the time we sent the last notification */
198 struct xfrm_replay_state preplay;
199 struct xfrm_replay_state_esn *preplay_esn;
200
201 /* The functions for replay detection. */
202 const struct xfrm_replay *repl;
203
204 /* internal flag that only holds state for delayed aevent at the
205 * moment
206 */
207 u32 xflags;
208
209 /* Replay detection notification settings */
210 u32 replay_maxage;
211 u32 replay_maxdiff;
212
213 /* Replay detection notification timer */
214 struct timer_list rtimer;
215
216 /* Statistics */
217 struct xfrm_stats stats;
218
219 struct xfrm_lifetime_cur curlft;
220 struct tasklet_hrtimer mtimer;
221
222 struct xfrm_state_offload xso;
223
224 /* used to fix curlft->add_time when changing date */
225 long saved_tmo;
226
227 /* Last used time */
228 unsigned long lastused;
229
230 struct page_frag xfrag;
231
232 /* Reference to data common to all the instances of this
233 * transformer. */
234 const struct xfrm_type *type;
235 struct xfrm_mode *inner_mode;
236 struct xfrm_mode *inner_mode_iaf;
237 struct xfrm_mode *outer_mode;
238
239 const struct xfrm_type_offload *type_offload;
240
241 /* Security context */
242 struct xfrm_sec_ctx *security;
243
244 /* Private data of this transformer, format is opaque,
245 * interpreted by xfrm_type methods. */
246 void *data;
247};
248
249static inline struct net *xs_net(struct xfrm_state *x)
250{
251 return read_pnet(&x->xs_net);
252}
253
254/* xflags - make enum if more show up */
255#define XFRM_TIME_DEFER 1
256#define XFRM_SOFT_EXPIRE 2
257
258enum {
259 XFRM_STATE_VOID,
260 XFRM_STATE_ACQ,
261 XFRM_STATE_VALID,
262 XFRM_STATE_ERROR,
263 XFRM_STATE_EXPIRED,
264 XFRM_STATE_DEAD
265};
266
267/* callback structure passed from either netlink or pfkey */
268struct km_event {
269 union {
270 u32 hard;
271 u32 proto;
272 u32 byid;
273 u32 aevent;
274 u32 type;
275 } data;
276
277 u32 seq;
278 u32 portid;
279 u32 event;
280 struct net *net;
281};
282
283struct xfrm_replay {
284 void (*advance)(struct xfrm_state *x, __be32 net_seq);
285 int (*check)(struct xfrm_state *x,
286 struct sk_buff *skb,
287 __be32 net_seq);
288 int (*recheck)(struct xfrm_state *x,
289 struct sk_buff *skb,
290 __be32 net_seq);
291 void (*notify)(struct xfrm_state *x, int event);
292 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
293};
294
295struct net_device;
296struct xfrm_type;
297struct xfrm_dst;
298struct xfrm_policy_afinfo {
299 struct dst_ops *dst_ops;
300 struct dst_entry *(*dst_lookup)(struct net *net,
301 int tos, int oif,
302 const xfrm_address_t *saddr,
303 const xfrm_address_t *daddr,
304 u32 mark);
305 int (*get_saddr)(struct net *net, int oif,
306 xfrm_address_t *saddr,
307 xfrm_address_t *daddr,
308 u32 mark);
309 void (*decode_session)(struct sk_buff *skb,
310 struct flowi *fl,
311 int reverse);
312 int (*get_tos)(const struct flowi *fl);
313 int (*init_path)(struct xfrm_dst *path,
314 struct dst_entry *dst,
315 int nfheader_len);
316 int (*fill_dst)(struct xfrm_dst *xdst,
317 struct net_device *dev,
318 const struct flowi *fl);
319 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
320};
321
322int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
323void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
324void km_policy_notify(struct xfrm_policy *xp, int dir,
325 const struct km_event *c);
326void xfrm_policy_cache_flush(void);
327void km_state_notify(struct xfrm_state *x, const struct km_event *c);
328
329struct xfrm_tmpl;
330int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
331 struct xfrm_policy *pol);
332void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
333int __xfrm_state_delete(struct xfrm_state *x);
334
335struct xfrm_state_afinfo {
336 unsigned int family;
337 unsigned int proto;
338 __be16 eth_proto;
339 struct module *owner;
340 const struct xfrm_type *type_map[IPPROTO_MAX];
341 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX];
342 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
343
344 int (*init_flags)(struct xfrm_state *x);
345 void (*init_tempsel)(struct xfrm_selector *sel,
346 const struct flowi *fl);
347 void (*init_temprop)(struct xfrm_state *x,
348 const struct xfrm_tmpl *tmpl,
349 const xfrm_address_t *daddr,
350 const xfrm_address_t *saddr);
351 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
352 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
353 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
354 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
355 int (*extract_input)(struct xfrm_state *x,
356 struct sk_buff *skb);
357 int (*extract_output)(struct xfrm_state *x,
358 struct sk_buff *skb);
359 int (*transport_finish)(struct sk_buff *skb,
360 int async);
361 void (*local_error)(struct sk_buff *skb, u32 mtu);
362};
363
364int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
365int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
366struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
367struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
368
369struct xfrm_input_afinfo {
370 unsigned int family;
371 int (*callback)(struct sk_buff *skb, u8 protocol,
372 int err);
373};
374
375int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
376int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
377
378void xfrm_flush_gc(void);
379void xfrm_state_delete_tunnel(struct xfrm_state *x);
380
381struct xfrm_type {
382 char *description;
383 struct module *owner;
384 u8 proto;
385 u8 flags;
386#define XFRM_TYPE_NON_FRAGMENT 1
387#define XFRM_TYPE_REPLAY_PROT 2
388#define XFRM_TYPE_LOCAL_COADDR 4
389#define XFRM_TYPE_REMOTE_COADDR 8
390
391 int (*init_state)(struct xfrm_state *x);
392 void (*destructor)(struct xfrm_state *);
393 int (*input)(struct xfrm_state *, struct sk_buff *skb);
394 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
395 int (*reject)(struct xfrm_state *, struct sk_buff *,
396 const struct flowi *);
397 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
398 /* Estimate maximal size of result of transformation of a dgram */
399 u32 (*get_mtu)(struct xfrm_state *, int size);
400};
401
402int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
403int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
404
405struct xfrm_type_offload {
406 char *description;
407 struct module *owner;
408 u8 proto;
409 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
410 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
411 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
412};
413
414int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
415int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
416
417struct xfrm_mode {
418 /*
419 * Remove encapsulation header.
420 *
421 * The IP header will be moved over the top of the encapsulation
422 * header.
423 *
424 * On entry, the transport header shall point to where the IP header
425 * should be and the network header shall be set to where the IP
426 * header currently is. skb->data shall point to the start of the
427 * payload.
428 */
429 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
430
431 /*
432 * This is the actual input entry point.
433 *
434 * For transport mode and equivalent this would be identical to
435 * input2 (which does not need to be set). While tunnel mode
436 * and equivalent would set this to the tunnel encapsulation function
437 * xfrm4_prepare_input that would in turn call input2.
438 */
439 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
440
441 /*
442 * Add encapsulation header.
443 *
444 * On exit, the transport header will be set to the start of the
445 * encapsulation header to be filled in by x->type->output and
446 * the mac header will be set to the nextheader (protocol for
447 * IPv4) field of the extension header directly preceding the
448 * encapsulation header, or in its absence, that of the top IP
449 * header. The value of the network header will always point
450 * to the top IP header while skb->data will point to the payload.
451 */
452 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
453
454 /*
455 * This is the actual output entry point.
456 *
457 * For transport mode and equivalent this would be identical to
458 * output2 (which does not need to be set). While tunnel mode
459 * and equivalent would set this to a tunnel encapsulation function
460 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
461 * call output2.
462 */
463 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
464
465 /*
466 * Adjust pointers into the packet and do GSO segmentation.
467 */
468 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
469
470 /*
471 * Adjust pointers into the packet when IPsec is done at layer2.
472 */
473 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
474
475 struct xfrm_state_afinfo *afinfo;
476 struct module *owner;
477 unsigned int encap;
478 int flags;
479};
480
481/* Flags for xfrm_mode. */
482enum {
483 XFRM_MODE_FLAG_TUNNEL = 1,
484};
485
486int xfrm_register_mode(struct xfrm_mode *mode, int family);
487int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
488
489static inline int xfrm_af2proto(unsigned int family)
490{
491 switch(family) {
492 case AF_INET:
493 return IPPROTO_IPIP;
494 case AF_INET6:
495 return IPPROTO_IPV6;
496 default:
497 return 0;
498 }
499}
500
501static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
502{
503 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
504 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
505 return x->inner_mode;
506 else
507 return x->inner_mode_iaf;
508}
509
510struct xfrm_tmpl {
511/* id in template is interpreted as:
512 * daddr - destination of tunnel, may be zero for transport mode.
513 * spi - zero to acquire spi. Not zero if spi is static, then
514 * daddr must be fixed too.
515 * proto - AH/ESP/IPCOMP
516 */
517 struct xfrm_id id;
518
519/* Source address of tunnel. Ignored, if it is not a tunnel. */
520 xfrm_address_t saddr;
521
522 unsigned short encap_family;
523
524 u32 reqid;
525
526/* Mode: transport, tunnel etc. */
527 u8 mode;
528
529/* Sharing mode: unique, this session only, this user only etc. */
530 u8 share;
531
532/* May skip this transfomration if no SA is found */
533 u8 optional;
534
535/* Skip aalgos/ealgos/calgos checks. */
536 u8 allalgs;
537
538/* Bit mask of algos allowed for acquisition */
539 u32 aalgos;
540 u32 ealgos;
541 u32 calgos;
542};
543
544#define XFRM_MAX_DEPTH 6
545#define XFRM_MAX_OFFLOAD_DEPTH 1
546
547struct xfrm_policy_walk_entry {
548 struct list_head all;
549 u8 dead;
550};
551
552struct xfrm_policy_walk {
553 struct xfrm_policy_walk_entry walk;
554 u8 type;
555 u32 seq;
556};
557
558struct xfrm_policy_queue {
559 struct sk_buff_head hold_queue;
560 struct timer_list hold_timer;
561 unsigned long timeout;
562};
563
564struct xfrm_policy {
565 possible_net_t xp_net;
566 struct hlist_node bydst;
567 struct hlist_node byidx;
568
569 /* This lock only affects elements except for entry. */
570 rwlock_t lock;
571 refcount_t refcnt;
572 struct timer_list timer;
573
574 atomic_t genid;
575 u32 priority;
576 u32 index;
577 struct xfrm_mark mark;
578 struct xfrm_selector selector;
579 struct xfrm_lifetime_cfg lft;
580 struct xfrm_lifetime_cur curlft;
581 struct xfrm_policy_walk_entry walk;
582 struct xfrm_policy_queue polq;
583 u8 type;
584 u8 action;
585 u8 flags;
586 u8 xfrm_nr;
587 u16 family;
588 struct xfrm_sec_ctx *security;
589 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
590 struct rcu_head rcu;
591};
592
593static inline struct net *xp_net(const struct xfrm_policy *xp)
594{
595 return read_pnet(&xp->xp_net);
596}
597
598struct xfrm_kmaddress {
599 xfrm_address_t local;
600 xfrm_address_t remote;
601 u32 reserved;
602 u16 family;
603};
604
605struct xfrm_migrate {
606 xfrm_address_t old_daddr;
607 xfrm_address_t old_saddr;
608 xfrm_address_t new_daddr;
609 xfrm_address_t new_saddr;
610 u8 proto;
611 u8 mode;
612 u16 reserved;
613 u32 reqid;
614 u16 old_family;
615 u16 new_family;
616};
617
618#define XFRM_KM_TIMEOUT 30
619/* what happened */
620#define XFRM_REPLAY_UPDATE XFRM_AE_CR
621#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
622
623/* default aevent timeout in units of 100ms */
624#define XFRM_AE_ETIME 10
625/* Async Event timer multiplier */
626#define XFRM_AE_ETH_M 10
627/* default seq threshold size */
628#define XFRM_AE_SEQT_SIZE 2
629
630struct xfrm_mgr {
631 struct list_head list;
632 int (*notify)(struct xfrm_state *x, const struct km_event *c);
633 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
634 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
635 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
636 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
637 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
638 int (*migrate)(const struct xfrm_selector *sel,
639 u8 dir, u8 type,
640 const struct xfrm_migrate *m,
641 int num_bundles,
642 const struct xfrm_kmaddress *k,
643 const struct xfrm_encap_tmpl *encap);
644 bool (*is_alive)(const struct km_event *c);
645};
646
647int xfrm_register_km(struct xfrm_mgr *km);
648int xfrm_unregister_km(struct xfrm_mgr *km);
649
650struct xfrm_tunnel_skb_cb {
651 union {
652 struct inet_skb_parm h4;
653 struct inet6_skb_parm h6;
654 } header;
655
656 union {
657 struct ip_tunnel *ip4;
658 struct ip6_tnl *ip6;
659 } tunnel;
660};
661
662#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
663
664/*
665 * This structure is used for the duration where packets are being
666 * transformed by IPsec. As soon as the packet leaves IPsec the
667 * area beyond the generic IP part may be overwritten.
668 */
669struct xfrm_skb_cb {
670 struct xfrm_tunnel_skb_cb header;
671
672 /* Sequence number for replay protection. */
673 union {
674 struct {
675 __u32 low;
676 __u32 hi;
677 } output;
678 struct {
679 __be32 low;
680 __be32 hi;
681 } input;
682 } seq;
683};
684
685#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
686
687/*
688 * This structure is used by the afinfo prepare_input/prepare_output functions
689 * to transmit header information to the mode input/output functions.
690 */
691struct xfrm_mode_skb_cb {
692 struct xfrm_tunnel_skb_cb header;
693
694 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
695 __be16 id;
696 __be16 frag_off;
697
698 /* IP header length (excluding options or extension headers). */
699 u8 ihl;
700
701 /* TOS for IPv4, class for IPv6. */
702 u8 tos;
703
704 /* TTL for IPv4, hop limitfor IPv6. */
705 u8 ttl;
706
707 /* Protocol for IPv4, NH for IPv6. */
708 u8 protocol;
709
710 /* Option length for IPv4, zero for IPv6. */
711 u8 optlen;
712
713 /* Used by IPv6 only, zero for IPv4. */
714 u8 flow_lbl[3];
715};
716
717#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
718
719/*
720 * This structure is used by the input processing to locate the SPI and
721 * related information.
722 */
723struct xfrm_spi_skb_cb {
724 struct xfrm_tunnel_skb_cb header;
725
726 unsigned int daddroff;
727 unsigned int family;
728 __be32 seq;
729};
730
731#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
732
733#ifdef CONFIG_AUDITSYSCALL
734static inline struct audit_buffer *xfrm_audit_start(const char *op)
735{
736 struct audit_buffer *audit_buf = NULL;
737
738 if (audit_enabled == 0)
739 return NULL;
740 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
741 AUDIT_MAC_IPSEC_EVENT);
742 if (audit_buf == NULL)
743 return NULL;
744 audit_log_format(audit_buf, "op=%s", op);
745 return audit_buf;
746}
747
748static inline void xfrm_audit_helper_usrinfo(bool task_valid,
749 struct audit_buffer *audit_buf)
750{
751 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
752 audit_get_loginuid(current) :
753 INVALID_UID);
754 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
755 (unsigned int) -1;
756
757 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
758 audit_log_task_context(audit_buf);
759}
760
761void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
762void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
763 bool task_valid);
764void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
765void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
766void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
767 struct sk_buff *skb);
768void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
769 __be32 net_seq);
770void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
771void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
772 __be32 net_seq);
773void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
774 u8 proto);
775#else
776
777static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
778 bool task_valid)
779{
780}
781
782static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
783 bool task_valid)
784{
785}
786
787static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
788 bool task_valid)
789{
790}
791
792static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
793 bool task_valid)
794{
795}
796
797static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
798 struct sk_buff *skb)
799{
800}
801
802static inline void xfrm_audit_state_replay(struct xfrm_state *x,
803 struct sk_buff *skb, __be32 net_seq)
804{
805}
806
807static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
808 u16 family)
809{
810}
811
812static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
813 __be32 net_spi, __be32 net_seq)
814{
815}
816
817static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
818 struct sk_buff *skb, u8 proto)
819{
820}
821#endif /* CONFIG_AUDITSYSCALL */
822
823static inline void xfrm_pol_hold(struct xfrm_policy *policy)
824{
825 if (likely(policy != NULL))
826 refcount_inc(&policy->refcnt);
827}
828
829void xfrm_policy_destroy(struct xfrm_policy *policy);
830
831static inline void xfrm_pol_put(struct xfrm_policy *policy)
832{
833 if (refcount_dec_and_test(&policy->refcnt))
834 xfrm_policy_destroy(policy);
835}
836
837static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
838{
839 int i;
840 for (i = npols - 1; i >= 0; --i)
841 xfrm_pol_put(pols[i]);
842}
843
844void __xfrm_state_destroy(struct xfrm_state *);
845
846static inline void __xfrm_state_put(struct xfrm_state *x)
847{
848 refcount_dec(&x->refcnt);
849}
850
851static inline void xfrm_state_put(struct xfrm_state *x)
852{
853 if (refcount_dec_and_test(&x->refcnt))
854 __xfrm_state_destroy(x);
855}
856
857static inline void xfrm_state_hold(struct xfrm_state *x)
858{
859 refcount_inc(&x->refcnt);
860}
861
862static inline bool addr_match(const void *token1, const void *token2,
863 unsigned int prefixlen)
864{
865 const __be32 *a1 = token1;
866 const __be32 *a2 = token2;
867 unsigned int pdw;
868 unsigned int pbi;
869
870 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
871 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
872
873 if (pdw)
874 if (memcmp(a1, a2, pdw << 2))
875 return false;
876
877 if (pbi) {
878 __be32 mask;
879
880 mask = htonl((0xffffffff) << (32 - pbi));
881
882 if ((a1[pdw] ^ a2[pdw]) & mask)
883 return false;
884 }
885
886 return true;
887}
888
889static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
890{
891 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
892 if (sizeof(long) == 4 && prefixlen == 0)
893 return true;
894 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
895}
896
897static __inline__
898__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
899{
900 __be16 port;
901 switch(fl->flowi_proto) {
902 case IPPROTO_TCP:
903 case IPPROTO_UDP:
904 case IPPROTO_UDPLITE:
905 case IPPROTO_SCTP:
906 port = uli->ports.sport;
907 break;
908 case IPPROTO_ICMP:
909 case IPPROTO_ICMPV6:
910 port = htons(uli->icmpt.type);
911 break;
912 case IPPROTO_MH:
913 port = htons(uli->mht.type);
914 break;
915 case IPPROTO_GRE:
916 port = htons(ntohl(uli->gre_key) >> 16);
917 break;
918 default:
919 port = 0; /*XXX*/
920 }
921 return port;
922}
923
924static __inline__
925__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
926{
927 __be16 port;
928 switch(fl->flowi_proto) {
929 case IPPROTO_TCP:
930 case IPPROTO_UDP:
931 case IPPROTO_UDPLITE:
932 case IPPROTO_SCTP:
933 port = uli->ports.dport;
934 break;
935 case IPPROTO_ICMP:
936 case IPPROTO_ICMPV6:
937 port = htons(uli->icmpt.code);
938 break;
939 case IPPROTO_GRE:
940 port = htons(ntohl(uli->gre_key) & 0xffff);
941 break;
942 default:
943 port = 0; /*XXX*/
944 }
945 return port;
946}
947
948bool xfrm_selector_match(const struct xfrm_selector *sel,
949 const struct flowi *fl, unsigned short family);
950
951#ifdef CONFIG_SECURITY_NETWORK_XFRM
952/* If neither has a context --> match
953 * Otherwise, both must have a context and the sids, doi, alg must match
954 */
955static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
956{
957 return ((!s1 && !s2) ||
958 (s1 && s2 &&
959 (s1->ctx_sid == s2->ctx_sid) &&
960 (s1->ctx_doi == s2->ctx_doi) &&
961 (s1->ctx_alg == s2->ctx_alg)));
962}
963#else
964static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
965{
966 return true;
967}
968#endif
969
970/* A struct encoding bundle of transformations to apply to some set of flow.
971 *
972 * xdst->child points to the next element of bundle.
973 * dst->xfrm points to an instanse of transformer.
974 *
975 * Due to unfortunate limitations of current routing cache, which we
976 * have no time to fix, it mirrors struct rtable and bound to the same
977 * routing key, including saddr,daddr. However, we can have many of
978 * bundles differing by session id. All the bundles grow from a parent
979 * policy rule.
980 */
981struct xfrm_dst {
982 union {
983 struct dst_entry dst;
984 struct rtable rt;
985 struct rt6_info rt6;
986 } u;
987 struct dst_entry *route;
988 struct dst_entry *child;
989 struct dst_entry *path;
990 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
991 int num_pols, num_xfrms;
992 u32 xfrm_genid;
993 u32 policy_genid;
994 u32 route_mtu_cached;
995 u32 child_mtu_cached;
996 u32 route_cookie;
997 u32 path_cookie;
998};
999
1000static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1001{
1002#ifdef CONFIG_XFRM
1003 if (dst->xfrm) {
1004 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1005
1006 return xdst->path;
1007 }
1008#endif
1009 return (struct dst_entry *) dst;
1010}
1011
1012static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1013{
1014#ifdef CONFIG_XFRM
1015 if (dst->xfrm) {
1016 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1017 return xdst->child;
1018 }
1019#endif
1020 return NULL;
1021}
1022
1023#ifdef CONFIG_XFRM
1024static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1025{
1026 xdst->child = child;
1027}
1028
1029static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1030{
1031 xfrm_pols_put(xdst->pols, xdst->num_pols);
1032 dst_release(xdst->route);
1033 if (likely(xdst->u.dst.xfrm))
1034 xfrm_state_put(xdst->u.dst.xfrm);
1035}
1036#endif
1037
1038void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1039
1040struct xfrm_offload {
1041 /* Output sequence number for replay protection on offloading. */
1042 struct {
1043 __u32 low;
1044 __u32 hi;
1045 } seq;
1046
1047 __u32 flags;
1048#define SA_DELETE_REQ 1
1049#define CRYPTO_DONE 2
1050#define CRYPTO_NEXT_DONE 4
1051#define CRYPTO_FALLBACK 8
1052#define XFRM_GSO_SEGMENT 16
1053#define XFRM_GRO 32
1054#define XFRM_ESP_NO_TRAILER 64
1055#define XFRM_DEV_RESUME 128
1056
1057 __u32 status;
1058#define CRYPTO_SUCCESS 1
1059#define CRYPTO_GENERIC_ERROR 2
1060#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1061#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1062#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1063#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1064#define CRYPTO_INVALID_PACKET_SYNTAX 64
1065#define CRYPTO_INVALID_PROTOCOL 128
1066
1067 __u8 proto;
1068};
1069
1070struct sec_path {
1071 refcount_t refcnt;
1072 int len;
1073 int olen;
1074
1075 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1076 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1077};
1078
1079static inline int secpath_exists(struct sk_buff *skb)
1080{
1081#ifdef CONFIG_XFRM
1082 return skb->sp != NULL;
1083#else
1084 return 0;
1085#endif
1086}
1087
1088static inline struct sec_path *
1089secpath_get(struct sec_path *sp)
1090{
1091 if (sp)
1092 refcount_inc(&sp->refcnt);
1093 return sp;
1094}
1095
1096void __secpath_destroy(struct sec_path *sp);
1097
1098static inline void
1099secpath_put(struct sec_path *sp)
1100{
1101 if (sp && refcount_dec_and_test(&sp->refcnt))
1102 __secpath_destroy(sp);
1103}
1104
1105struct sec_path *secpath_dup(struct sec_path *src);
1106int secpath_set(struct sk_buff *skb);
1107
1108static inline void
1109secpath_reset(struct sk_buff *skb)
1110{
1111#ifdef CONFIG_XFRM
1112 secpath_put(skb->sp);
1113 skb->sp = NULL;
1114#endif
1115}
1116
1117static inline int
1118xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1119{
1120 switch (family) {
1121 case AF_INET:
1122 return addr->a4 == 0;
1123 case AF_INET6:
1124 return ipv6_addr_any(&addr->in6);
1125 }
1126 return 0;
1127}
1128
1129static inline int
1130__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1131{
1132 return (tmpl->saddr.a4 &&
1133 tmpl->saddr.a4 != x->props.saddr.a4);
1134}
1135
1136static inline int
1137__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1138{
1139 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1140 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1141}
1142
1143static inline int
1144xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1145{
1146 switch (family) {
1147 case AF_INET:
1148 return __xfrm4_state_addr_cmp(tmpl, x);
1149 case AF_INET6:
1150 return __xfrm6_state_addr_cmp(tmpl, x);
1151 }
1152 return !0;
1153}
1154
1155#ifdef CONFIG_XFRM
1156int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1157 unsigned short family);
1158
1159static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1160 struct sk_buff *skb,
1161 unsigned int family, int reverse)
1162{
1163 struct net *net = dev_net(skb->dev);
1164 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1165
1166 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1167 return __xfrm_policy_check(sk, ndir, skb, family);
1168
1169 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1170 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1171 __xfrm_policy_check(sk, ndir, skb, family);
1172}
1173
1174static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1175{
1176 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1177}
1178
1179static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1180{
1181 return xfrm_policy_check(sk, dir, skb, AF_INET);
1182}
1183
1184static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1185{
1186 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1187}
1188
1189static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1190 struct sk_buff *skb)
1191{
1192 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1193}
1194
1195static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1196 struct sk_buff *skb)
1197{
1198 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1199}
1200
1201int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1202 unsigned int family, int reverse);
1203
1204static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1205 unsigned int family)
1206{
1207 return __xfrm_decode_session(skb, fl, family, 0);
1208}
1209
1210static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1211 struct flowi *fl,
1212 unsigned int family)
1213{
1214 return __xfrm_decode_session(skb, fl, family, 1);
1215}
1216
1217int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1218
1219static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1220{
1221 struct net *net = dev_net(skb->dev);
1222
1223 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1224 (skb_dst(skb)->flags & DST_NOXFRM) ||
1225 __xfrm_route_forward(skb, family);
1226}
1227
1228static inline int xfrm4_route_forward(struct sk_buff *skb)
1229{
1230 return xfrm_route_forward(skb, AF_INET);
1231}
1232
1233static inline int xfrm6_route_forward(struct sk_buff *skb)
1234{
1235 return xfrm_route_forward(skb, AF_INET6);
1236}
1237
1238int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1239
1240static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1241{
1242 sk->sk_policy[0] = NULL;
1243 sk->sk_policy[1] = NULL;
1244 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1245 return __xfrm_sk_clone_policy(sk, osk);
1246 return 0;
1247}
1248
1249int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1250
1251static inline void xfrm_sk_free_policy(struct sock *sk)
1252{
1253 struct xfrm_policy *pol;
1254
1255 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1256 if (unlikely(pol != NULL)) {
1257 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1258 sk->sk_policy[0] = NULL;
1259 }
1260 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1261 if (unlikely(pol != NULL)) {
1262 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1263 sk->sk_policy[1] = NULL;
1264 }
1265}
1266
1267#else
1268
1269static inline void xfrm_sk_free_policy(struct sock *sk) {}
1270static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1271static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1272static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1273static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1274{
1275 return 1;
1276}
1277static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1278{
1279 return 1;
1280}
1281static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1282{
1283 return 1;
1284}
1285static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1286 struct flowi *fl,
1287 unsigned int family)
1288{
1289 return -ENOSYS;
1290}
1291static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1292 struct sk_buff *skb)
1293{
1294 return 1;
1295}
1296static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1297 struct sk_buff *skb)
1298{
1299 return 1;
1300}
1301#endif
1302
1303static __inline__
1304xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1305{
1306 switch (family){
1307 case AF_INET:
1308 return (xfrm_address_t *)&fl->u.ip4.daddr;
1309 case AF_INET6:
1310 return (xfrm_address_t *)&fl->u.ip6.daddr;
1311 }
1312 return NULL;
1313}
1314
1315static __inline__
1316xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1317{
1318 switch (family){
1319 case AF_INET:
1320 return (xfrm_address_t *)&fl->u.ip4.saddr;
1321 case AF_INET6:
1322 return (xfrm_address_t *)&fl->u.ip6.saddr;
1323 }
1324 return NULL;
1325}
1326
1327static __inline__
1328void xfrm_flowi_addr_get(const struct flowi *fl,
1329 xfrm_address_t *saddr, xfrm_address_t *daddr,
1330 unsigned short family)
1331{
1332 switch(family) {
1333 case AF_INET:
1334 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1335 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1336 break;
1337 case AF_INET6:
1338 saddr->in6 = fl->u.ip6.saddr;
1339 daddr->in6 = fl->u.ip6.daddr;
1340 break;
1341 }
1342}
1343
1344static __inline__ int
1345__xfrm4_state_addr_check(const struct xfrm_state *x,
1346 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1347{
1348 if (daddr->a4 == x->id.daddr.a4 &&
1349 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1350 return 1;
1351 return 0;
1352}
1353
1354static __inline__ int
1355__xfrm6_state_addr_check(const struct xfrm_state *x,
1356 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1357{
1358 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1359 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1360 ipv6_addr_any((struct in6_addr *)saddr) ||
1361 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1362 return 1;
1363 return 0;
1364}
1365
1366static __inline__ int
1367xfrm_state_addr_check(const struct xfrm_state *x,
1368 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1369 unsigned short family)
1370{
1371 switch (family) {
1372 case AF_INET:
1373 return __xfrm4_state_addr_check(x, daddr, saddr);
1374 case AF_INET6:
1375 return __xfrm6_state_addr_check(x, daddr, saddr);
1376 }
1377 return 0;
1378}
1379
1380static __inline__ int
1381xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1382 unsigned short family)
1383{
1384 switch (family) {
1385 case AF_INET:
1386 return __xfrm4_state_addr_check(x,
1387 (const xfrm_address_t *)&fl->u.ip4.daddr,
1388 (const xfrm_address_t *)&fl->u.ip4.saddr);
1389 case AF_INET6:
1390 return __xfrm6_state_addr_check(x,
1391 (const xfrm_address_t *)&fl->u.ip6.daddr,
1392 (const xfrm_address_t *)&fl->u.ip6.saddr);
1393 }
1394 return 0;
1395}
1396
1397static inline int xfrm_state_kern(const struct xfrm_state *x)
1398{
1399 return atomic_read(&x->tunnel_users);
1400}
1401
1402static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1403{
1404 return (!userproto || proto == userproto ||
1405 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1406 proto == IPPROTO_ESP ||
1407 proto == IPPROTO_COMP)));
1408}
1409
1410/*
1411 * xfrm algorithm information
1412 */
1413struct xfrm_algo_aead_info {
1414 char *geniv;
1415 u16 icv_truncbits;
1416};
1417
1418struct xfrm_algo_auth_info {
1419 u16 icv_truncbits;
1420 u16 icv_fullbits;
1421};
1422
1423struct xfrm_algo_encr_info {
1424 char *geniv;
1425 u16 blockbits;
1426 u16 defkeybits;
1427};
1428
1429struct xfrm_algo_comp_info {
1430 u16 threshold;
1431};
1432
1433struct xfrm_algo_desc {
1434 char *name;
1435 char *compat;
1436 u8 available:1;
1437 u8 pfkey_supported:1;
1438 union {
1439 struct xfrm_algo_aead_info aead;
1440 struct xfrm_algo_auth_info auth;
1441 struct xfrm_algo_encr_info encr;
1442 struct xfrm_algo_comp_info comp;
1443 } uinfo;
1444 struct sadb_alg desc;
1445};
1446
1447/* XFRM protocol handlers. */
1448struct xfrm4_protocol {
1449 int (*handler)(struct sk_buff *skb);
1450 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1451 int encap_type);
1452 int (*cb_handler)(struct sk_buff *skb, int err);
1453 int (*err_handler)(struct sk_buff *skb, u32 info);
1454
1455 struct xfrm4_protocol __rcu *next;
1456 int priority;
1457};
1458
1459struct xfrm6_protocol {
1460 int (*handler)(struct sk_buff *skb);
1461 int (*cb_handler)(struct sk_buff *skb, int err);
1462 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1463 u8 type, u8 code, int offset, __be32 info);
1464
1465 struct xfrm6_protocol __rcu *next;
1466 int priority;
1467};
1468
1469/* XFRM tunnel handlers. */
1470struct xfrm_tunnel {
1471 int (*handler)(struct sk_buff *skb);
1472 int (*err_handler)(struct sk_buff *skb, u32 info);
1473
1474 struct xfrm_tunnel __rcu *next;
1475 int priority;
1476};
1477
1478struct xfrm6_tunnel {
1479 int (*handler)(struct sk_buff *skb);
1480 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1481 u8 type, u8 code, int offset, __be32 info);
1482 struct xfrm6_tunnel __rcu *next;
1483 int priority;
1484};
1485
1486void xfrm_init(void);
1487void xfrm4_init(void);
1488int xfrm_state_init(struct net *net);
1489void xfrm_state_fini(struct net *net);
1490void xfrm4_state_init(void);
1491void xfrm4_protocol_init(void);
1492#ifdef CONFIG_XFRM
1493int xfrm6_init(void);
1494void xfrm6_fini(void);
1495int xfrm6_state_init(void);
1496void xfrm6_state_fini(void);
1497int xfrm6_protocol_init(void);
1498void xfrm6_protocol_fini(void);
1499#else
1500static inline int xfrm6_init(void)
1501{
1502 return 0;
1503}
1504static inline void xfrm6_fini(void)
1505{
1506 ;
1507}
1508#endif
1509
1510#ifdef CONFIG_XFRM_STATISTICS
1511int xfrm_proc_init(struct net *net);
1512void xfrm_proc_fini(struct net *net);
1513#endif
1514
1515int xfrm_sysctl_init(struct net *net);
1516#ifdef CONFIG_SYSCTL
1517void xfrm_sysctl_fini(struct net *net);
1518#else
1519static inline void xfrm_sysctl_fini(struct net *net)
1520{
1521}
1522#endif
1523
1524void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1525 struct xfrm_address_filter *filter);
1526int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1527 int (*func)(struct xfrm_state *, int, void*), void *);
1528void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1529struct xfrm_state *xfrm_state_alloc(struct net *net);
1530struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1531 const xfrm_address_t *saddr,
1532 const struct flowi *fl,
1533 struct xfrm_tmpl *tmpl,
1534 struct xfrm_policy *pol, int *err,
1535 unsigned short family);
1536struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1537 xfrm_address_t *daddr,
1538 xfrm_address_t *saddr,
1539 unsigned short family,
1540 u8 mode, u8 proto, u32 reqid);
1541struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1542 unsigned short family);
1543int xfrm_state_check_expire(struct xfrm_state *x);
1544void xfrm_state_insert(struct xfrm_state *x);
1545int xfrm_state_add(struct xfrm_state *x);
1546int xfrm_state_update(struct xfrm_state *x);
1547struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1548 const xfrm_address_t *daddr, __be32 spi,
1549 u8 proto, unsigned short family);
1550struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1551 const xfrm_address_t *daddr,
1552 const xfrm_address_t *saddr,
1553 u8 proto,
1554 unsigned short family);
1555#ifdef CONFIG_XFRM_SUB_POLICY
1556int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1557 unsigned short family, struct net *net);
1558int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1559 unsigned short family);
1560#else
1561static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1562 int n, unsigned short family, struct net *net)
1563{
1564 return -ENOSYS;
1565}
1566
1567static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1568 int n, unsigned short family)
1569{
1570 return -ENOSYS;
1571}
1572#endif
1573
1574struct xfrmk_sadinfo {
1575 u32 sadhcnt; /* current hash bkts */
1576 u32 sadhmcnt; /* max allowed hash bkts */
1577 u32 sadcnt; /* current running count */
1578};
1579
1580struct xfrmk_spdinfo {
1581 u32 incnt;
1582 u32 outcnt;
1583 u32 fwdcnt;
1584 u32 inscnt;
1585 u32 outscnt;
1586 u32 fwdscnt;
1587 u32 spdhcnt;
1588 u32 spdhmcnt;
1589};
1590
1591struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1592int xfrm_state_delete(struct xfrm_state *x);
1593int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1594int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1595void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1596void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1597u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1598int xfrm_init_replay(struct xfrm_state *x);
1599int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1600int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1601int xfrm_init_state(struct xfrm_state *x);
1602int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1603int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1604int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1605int xfrm_trans_queue(struct sk_buff *skb,
1606 int (*finish)(struct net *, struct sock *,
1607 struct sk_buff *));
1608int xfrm_output_resume(struct sk_buff *skb, int err);
1609int xfrm_output(struct sock *sk, struct sk_buff *skb);
1610int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1611void xfrm_local_error(struct sk_buff *skb, int mtu);
1612int xfrm4_extract_header(struct sk_buff *skb);
1613int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1614int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1615 int encap_type);
1616int xfrm4_transport_finish(struct sk_buff *skb, int async);
1617int xfrm4_rcv(struct sk_buff *skb);
1618int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1619
1620static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1621{
1622 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1623 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1624 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1625 return xfrm_input(skb, nexthdr, spi, 0);
1626}
1627
1628int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1629int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1630int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1631int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1632int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1633int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1634int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1635int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1636int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1637void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1638int xfrm6_extract_header(struct sk_buff *skb);
1639int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1640int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1641 struct ip6_tnl *t);
1642int xfrm6_transport_finish(struct sk_buff *skb, int async);
1643int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1644int xfrm6_rcv(struct sk_buff *skb);
1645int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1646 xfrm_address_t *saddr, u8 proto);
1647void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1648int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1649int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1650int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1651int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1652int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1653__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1654__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1655int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1656int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1657int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1658int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1659int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1660 u8 **prevhdr);
1661
1662#ifdef CONFIG_XFRM
1663int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1664int xfrm_user_policy(struct sock *sk, int optname,
1665 u8 __user *optval, int optlen);
1666#else
1667static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1668{
1669 return -ENOPROTOOPT;
1670}
1671
1672static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1673{
1674 /* should not happen */
1675 kfree_skb(skb);
1676 return 0;
1677}
1678#endif
1679
1680struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1681 const xfrm_address_t *saddr,
1682 const xfrm_address_t *daddr,
1683 int family, u32 mark);
1684
1685struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1686
1687void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1688int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1689 int (*func)(struct xfrm_policy *, int, int, void*),
1690 void *);
1691void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1692int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1693struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1694 u8 type, int dir,
1695 struct xfrm_selector *sel,
1696 struct xfrm_sec_ctx *ctx, int delete,
1697 int *err);
1698struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1699 u32 id, int delete, int *err);
1700int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1701void xfrm_policy_hash_rebuild(struct net *net);
1702u32 xfrm_get_acqseq(void);
1703int verify_spi_info(u8 proto, u32 min, u32 max);
1704int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1705struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1706 u8 mode, u32 reqid, u8 proto,
1707 const xfrm_address_t *daddr,
1708 const xfrm_address_t *saddr, int create,
1709 unsigned short family);
1710int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1711
1712#ifdef CONFIG_XFRM_MIGRATE
1713int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1714 const struct xfrm_migrate *m, int num_bundles,
1715 const struct xfrm_kmaddress *k,
1716 const struct xfrm_encap_tmpl *encap);
1717struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1718struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1719 struct xfrm_migrate *m,
1720 struct xfrm_encap_tmpl *encap);
1721int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1722 struct xfrm_migrate *m, int num_bundles,
1723 struct xfrm_kmaddress *k, struct net *net,
1724 struct xfrm_encap_tmpl *encap);
1725#endif
1726
1727int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1728void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1729int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1730 xfrm_address_t *addr);
1731
1732void xfrm_input_init(void);
1733int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1734
1735void xfrm_probe_algs(void);
1736int xfrm_count_pfkey_auth_supported(void);
1737int xfrm_count_pfkey_enc_supported(void);
1738struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1739struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1740struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1741struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1742struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1743struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1744struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1745struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1746struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1747 int probe);
1748
1749static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1750 const xfrm_address_t *b)
1751{
1752 return ipv6_addr_equal((const struct in6_addr *)a,
1753 (const struct in6_addr *)b);
1754}
1755
1756static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1757 const xfrm_address_t *b,
1758 sa_family_t family)
1759{
1760 switch (family) {
1761 default:
1762 case AF_INET:
1763 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1764 case AF_INET6:
1765 return xfrm6_addr_equal(a, b);
1766 }
1767}
1768
1769static inline int xfrm_policy_id2dir(u32 index)
1770{
1771 return index & 7;
1772}
1773
1774#ifdef CONFIG_XFRM
1775static inline int xfrm_aevent_is_on(struct net *net)
1776{
1777 struct sock *nlsk;
1778 int ret = 0;
1779
1780 rcu_read_lock();
1781 nlsk = rcu_dereference(net->xfrm.nlsk);
1782 if (nlsk)
1783 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1784 rcu_read_unlock();
1785 return ret;
1786}
1787
1788static inline int xfrm_acquire_is_on(struct net *net)
1789{
1790 struct sock *nlsk;
1791 int ret = 0;
1792
1793 rcu_read_lock();
1794 nlsk = rcu_dereference(net->xfrm.nlsk);
1795 if (nlsk)
1796 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1797 rcu_read_unlock();
1798
1799 return ret;
1800}
1801#endif
1802
1803static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1804{
1805 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1806}
1807
1808static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1809{
1810 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1811}
1812
1813static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1814{
1815 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1816}
1817
1818static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1819{
1820 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1821}
1822
1823#ifdef CONFIG_XFRM_MIGRATE
1824static inline int xfrm_replay_clone(struct xfrm_state *x,
1825 struct xfrm_state *orig)
1826{
1827 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1828 GFP_KERNEL);
1829 if (!x->replay_esn)
1830 return -ENOMEM;
1831
1832 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1833 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1834
1835 x->preplay_esn = kmemdup(x->replay_esn,
1836 xfrm_replay_state_esn_len(x->replay_esn),
1837 GFP_KERNEL);
1838 if (!x->preplay_esn) {
1839 kfree(x->replay_esn);
1840 return -ENOMEM;
1841 }
1842
1843 return 0;
1844}
1845
1846static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1847{
1848 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1849}
1850
1851
1852static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1853{
1854 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1855}
1856
1857static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1858{
1859 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1860}
1861
1862static inline void xfrm_states_put(struct xfrm_state **states, int n)
1863{
1864 int i;
1865 for (i = 0; i < n; i++)
1866 xfrm_state_put(*(states + i));
1867}
1868
1869static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1870{
1871 int i;
1872 for (i = 0; i < n; i++)
1873 xfrm_state_delete(*(states + i));
1874}
1875#endif
1876
1877#ifdef CONFIG_XFRM
1878static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1879{
1880 return skb->sp->xvec[skb->sp->len - 1];
1881}
1882#endif
1883
1884static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1885{
1886#ifdef CONFIG_XFRM
1887 struct sec_path *sp = skb->sp;
1888
1889 if (!sp || !sp->olen || sp->len != sp->olen)
1890 return NULL;
1891
1892 return &sp->ovec[sp->olen - 1];
1893#else
1894 return NULL;
1895#endif
1896}
1897
1898void __init xfrm_dev_init(void);
1899
1900#ifdef CONFIG_XFRM_OFFLOAD
1901void xfrm_dev_resume(struct sk_buff *skb);
1902void xfrm_dev_backlog(struct softnet_data *sd);
1903struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1904int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1905 struct xfrm_user_offload *xuo);
1906bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1907
1908static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1909{
1910 struct xfrm_state_offload *xso = &x->xso;
1911
1912 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1913 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1914}
1915
1916static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1917{
1918 struct xfrm_state *x = dst->xfrm;
1919 struct xfrm_dst *xdst;
1920
1921 if (!x || !x->type_offload)
1922 return false;
1923
1924 xdst = (struct xfrm_dst *) dst;
1925 if (!x->xso.offload_handle && !xdst->child->xfrm)
1926 return true;
1927 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1928 !xdst->child->xfrm)
1929 return true;
1930
1931 return false;
1932}
1933
1934static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1935{
1936 struct xfrm_state_offload *xso = &x->xso;
1937
1938 if (xso->dev)
1939 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1940}
1941
1942static inline void xfrm_dev_state_free(struct xfrm_state *x)
1943{
1944 struct xfrm_state_offload *xso = &x->xso;
1945 struct net_device *dev = xso->dev;
1946
1947 if (dev && dev->xfrmdev_ops) {
1948 if (dev->xfrmdev_ops->xdo_dev_state_free)
1949 dev->xfrmdev_ops->xdo_dev_state_free(x);
1950 xso->dev = NULL;
1951 dev_put(dev);
1952 }
1953}
1954#else
1955static inline void xfrm_dev_resume(struct sk_buff *skb)
1956{
1957}
1958
1959static inline void xfrm_dev_backlog(struct softnet_data *sd)
1960{
1961}
1962
1963static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1964{
1965 return skb;
1966}
1967
1968static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1969{
1970 return 0;
1971}
1972
1973static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1974{
1975}
1976
1977static inline void xfrm_dev_state_free(struct xfrm_state *x)
1978{
1979}
1980
1981static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1982{
1983 return false;
1984}
1985
1986static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1987{
1988}
1989
1990static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1991{
1992 return false;
1993}
1994#endif
1995
1996static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1997{
1998 if (attrs[XFRMA_MARK])
1999 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2000 else
2001 m->v = m->m = 0;
2002
2003 return m->v & m->m;
2004}
2005
2006static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2007{
2008 int ret = 0;
2009
2010 if (m->m | m->v)
2011 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2012 return ret;
2013}
2014
2015static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2016 unsigned int family)
2017{
2018 bool tunnel = false;
2019
2020 switch(family) {
2021 case AF_INET:
2022 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2023 tunnel = true;
2024 break;
2025 case AF_INET6:
2026 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2027 tunnel = true;
2028 break;
2029 }
2030 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2031 return -EINVAL;
2032
2033 return 0;
2034}
2035#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 */