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#include <net/gro_cells.h>
27
28#include <linux/interrupt.h>
29
30#ifdef CONFIG_XFRM_STATISTICS
31#include <net/snmp.h>
32#endif
33
34#define XFRM_PROTO_ESP 50
35#define XFRM_PROTO_AH 51
36#define XFRM_PROTO_COMP 108
37#define XFRM_PROTO_IPIP 4
38#define XFRM_PROTO_IPV6 41
39#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
40#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
41
42#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
43#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
44#define MODULE_ALIAS_XFRM_MODE(family, encap) \
45 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
46#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
47 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
48#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
49 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
50
51#ifdef CONFIG_XFRM_STATISTICS
52#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
53#else
54#define XFRM_INC_STATS(net, field) ((void)(net))
55#endif
56
57
58/* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 u8 dying;
123 u8 proto;
124 u32 seq;
125 struct xfrm_address_filter *filter;
126};
127
128struct xfrm_state_offload {
129 struct net_device *dev;
130 unsigned long offload_handle;
131 unsigned int num_exthdrs;
132 u8 flags;
133};
134
135/* Full description of state of transformer. */
136struct xfrm_state {
137 possible_net_t xs_net;
138 union {
139 struct hlist_node gclist;
140 struct hlist_node bydst;
141 };
142 struct hlist_node bysrc;
143 struct hlist_node byspi;
144
145 refcount_t refcnt;
146 spinlock_t lock;
147
148 struct xfrm_id id;
149 struct xfrm_selector sel;
150 struct xfrm_mark mark;
151 u32 if_id;
152 u32 tfcpad;
153
154 u32 genid;
155
156 /* Key manager bits */
157 struct xfrm_state_walk km;
158
159 /* Parameters of this state. */
160 struct {
161 u32 reqid;
162 u8 mode;
163 u8 replay_window;
164 u8 aalgo, ealgo, calgo;
165 u8 flags;
166 u16 family;
167 xfrm_address_t saddr;
168 int header_len;
169 int trailer_len;
170 u32 extra_flags;
171 struct xfrm_mark smark;
172 } props;
173
174 struct xfrm_lifetime_cfg lft;
175
176 /* Data for transformer */
177 struct xfrm_algo_auth *aalg;
178 struct xfrm_algo *ealg;
179 struct xfrm_algo *calg;
180 struct xfrm_algo_aead *aead;
181 const char *geniv;
182
183 /* Data for encapsulator */
184 struct xfrm_encap_tmpl *encap;
185
186 /* Data for care-of address */
187 xfrm_address_t *coaddr;
188
189 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
190 struct xfrm_state *tunnel;
191
192 /* If a tunnel, number of users + 1 */
193 atomic_t tunnel_users;
194
195 /* State for replay detection */
196 struct xfrm_replay_state replay;
197 struct xfrm_replay_state_esn *replay_esn;
198
199 /* Replay detection state at the time we sent the last notification */
200 struct xfrm_replay_state preplay;
201 struct xfrm_replay_state_esn *preplay_esn;
202
203 /* The functions for replay detection. */
204 const struct xfrm_replay *repl;
205
206 /* internal flag that only holds state for delayed aevent at the
207 * moment
208 */
209 u32 xflags;
210
211 /* Replay detection notification settings */
212 u32 replay_maxage;
213 u32 replay_maxdiff;
214
215 /* Replay detection notification timer */
216 struct timer_list rtimer;
217
218 /* Statistics */
219 struct xfrm_stats stats;
220
221 struct xfrm_lifetime_cur curlft;
222 struct tasklet_hrtimer mtimer;
223
224 struct xfrm_state_offload xso;
225
226 /* used to fix curlft->add_time when changing date */
227 long saved_tmo;
228
229 /* Last used time */
230 time64_t lastused;
231
232 struct page_frag xfrag;
233
234 /* Reference to data common to all the instances of this
235 * transformer. */
236 const struct xfrm_type *type;
237 struct xfrm_mode *inner_mode;
238 struct xfrm_mode *inner_mode_iaf;
239 struct xfrm_mode *outer_mode;
240
241 const struct xfrm_type_offload *type_offload;
242
243 /* Security context */
244 struct xfrm_sec_ctx *security;
245
246 /* Private data of this transformer, format is opaque,
247 * interpreted by xfrm_type methods. */
248 void *data;
249};
250
251static inline struct net *xs_net(struct xfrm_state *x)
252{
253 return read_pnet(&x->xs_net);
254}
255
256/* xflags - make enum if more show up */
257#define XFRM_TIME_DEFER 1
258#define XFRM_SOFT_EXPIRE 2
259
260enum {
261 XFRM_STATE_VOID,
262 XFRM_STATE_ACQ,
263 XFRM_STATE_VALID,
264 XFRM_STATE_ERROR,
265 XFRM_STATE_EXPIRED,
266 XFRM_STATE_DEAD
267};
268
269/* callback structure passed from either netlink or pfkey */
270struct km_event {
271 union {
272 u32 hard;
273 u32 proto;
274 u32 byid;
275 u32 aevent;
276 u32 type;
277 } data;
278
279 u32 seq;
280 u32 portid;
281 u32 event;
282 struct net *net;
283};
284
285struct xfrm_replay {
286 void (*advance)(struct xfrm_state *x, __be32 net_seq);
287 int (*check)(struct xfrm_state *x,
288 struct sk_buff *skb,
289 __be32 net_seq);
290 int (*recheck)(struct xfrm_state *x,
291 struct sk_buff *skb,
292 __be32 net_seq);
293 void (*notify)(struct xfrm_state *x, int event);
294 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
295};
296
297struct xfrm_if_cb {
298 struct xfrm_if *(*decode_session)(struct sk_buff *skb);
299};
300
301void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
302void xfrm_if_unregister_cb(void);
303
304struct net_device;
305struct xfrm_type;
306struct xfrm_dst;
307struct xfrm_policy_afinfo {
308 struct dst_ops *dst_ops;
309 struct dst_entry *(*dst_lookup)(struct net *net,
310 int tos, int oif,
311 const xfrm_address_t *saddr,
312 const xfrm_address_t *daddr,
313 u32 mark);
314 int (*get_saddr)(struct net *net, int oif,
315 xfrm_address_t *saddr,
316 xfrm_address_t *daddr,
317 u32 mark);
318 void (*decode_session)(struct sk_buff *skb,
319 struct flowi *fl,
320 int reverse);
321 int (*get_tos)(const struct flowi *fl);
322 int (*init_path)(struct xfrm_dst *path,
323 struct dst_entry *dst,
324 int nfheader_len);
325 int (*fill_dst)(struct xfrm_dst *xdst,
326 struct net_device *dev,
327 const struct flowi *fl);
328 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
329};
330
331int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
332void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
333void km_policy_notify(struct xfrm_policy *xp, int dir,
334 const struct km_event *c);
335void km_state_notify(struct xfrm_state *x, const struct km_event *c);
336
337struct xfrm_tmpl;
338int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
339 struct xfrm_policy *pol);
340void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
341int __xfrm_state_delete(struct xfrm_state *x);
342
343struct xfrm_state_afinfo {
344 unsigned int family;
345 unsigned int proto;
346 __be16 eth_proto;
347 struct module *owner;
348 const struct xfrm_type *type_map[IPPROTO_MAX];
349 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX];
350 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
351
352 int (*init_flags)(struct xfrm_state *x);
353 void (*init_tempsel)(struct xfrm_selector *sel,
354 const struct flowi *fl);
355 void (*init_temprop)(struct xfrm_state *x,
356 const struct xfrm_tmpl *tmpl,
357 const xfrm_address_t *daddr,
358 const xfrm_address_t *saddr);
359 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
360 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
361 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
362 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
363 int (*extract_input)(struct xfrm_state *x,
364 struct sk_buff *skb);
365 int (*extract_output)(struct xfrm_state *x,
366 struct sk_buff *skb);
367 int (*transport_finish)(struct sk_buff *skb,
368 int async);
369 void (*local_error)(struct sk_buff *skb, u32 mtu);
370};
371
372int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
373int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
374struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
375struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
376
377struct xfrm_input_afinfo {
378 unsigned int family;
379 int (*callback)(struct sk_buff *skb, u8 protocol,
380 int err);
381};
382
383int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
384int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
385
386void xfrm_flush_gc(void);
387void xfrm_state_delete_tunnel(struct xfrm_state *x);
388
389struct xfrm_type {
390 char *description;
391 struct module *owner;
392 u8 proto;
393 u8 flags;
394#define XFRM_TYPE_NON_FRAGMENT 1
395#define XFRM_TYPE_REPLAY_PROT 2
396#define XFRM_TYPE_LOCAL_COADDR 4
397#define XFRM_TYPE_REMOTE_COADDR 8
398
399 int (*init_state)(struct xfrm_state *x);
400 void (*destructor)(struct xfrm_state *);
401 int (*input)(struct xfrm_state *, struct sk_buff *skb);
402 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
403 int (*reject)(struct xfrm_state *, struct sk_buff *,
404 const struct flowi *);
405 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
406 /* Estimate maximal size of result of transformation of a dgram */
407 u32 (*get_mtu)(struct xfrm_state *, int size);
408};
409
410int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
411int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
412
413struct xfrm_type_offload {
414 char *description;
415 struct module *owner;
416 u8 proto;
417 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
418 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
419 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
420};
421
422int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
423int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
424
425struct xfrm_mode {
426 /*
427 * Remove encapsulation header.
428 *
429 * The IP header will be moved over the top of the encapsulation
430 * header.
431 *
432 * On entry, the transport header shall point to where the IP header
433 * should be and the network header shall be set to where the IP
434 * header currently is. skb->data shall point to the start of the
435 * payload.
436 */
437 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
438
439 /*
440 * This is the actual input entry point.
441 *
442 * For transport mode and equivalent this would be identical to
443 * input2 (which does not need to be set). While tunnel mode
444 * and equivalent would set this to the tunnel encapsulation function
445 * xfrm4_prepare_input that would in turn call input2.
446 */
447 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
448
449 /*
450 * Add encapsulation header.
451 *
452 * On exit, the transport header will be set to the start of the
453 * encapsulation header to be filled in by x->type->output and
454 * the mac header will be set to the nextheader (protocol for
455 * IPv4) field of the extension header directly preceding the
456 * encapsulation header, or in its absence, that of the top IP
457 * header. The value of the network header will always point
458 * to the top IP header while skb->data will point to the payload.
459 */
460 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
461
462 /*
463 * This is the actual output entry point.
464 *
465 * For transport mode and equivalent this would be identical to
466 * output2 (which does not need to be set). While tunnel mode
467 * and equivalent would set this to a tunnel encapsulation function
468 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
469 * call output2.
470 */
471 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
472
473 /*
474 * Adjust pointers into the packet and do GSO segmentation.
475 */
476 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
477
478 /*
479 * Adjust pointers into the packet when IPsec is done at layer2.
480 */
481 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
482
483 struct xfrm_state_afinfo *afinfo;
484 struct module *owner;
485 unsigned int encap;
486 int flags;
487};
488
489/* Flags for xfrm_mode. */
490enum {
491 XFRM_MODE_FLAG_TUNNEL = 1,
492};
493
494int xfrm_register_mode(struct xfrm_mode *mode, int family);
495int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
496
497static inline int xfrm_af2proto(unsigned int family)
498{
499 switch(family) {
500 case AF_INET:
501 return IPPROTO_IPIP;
502 case AF_INET6:
503 return IPPROTO_IPV6;
504 default:
505 return 0;
506 }
507}
508
509static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
510{
511 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
512 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
513 return x->inner_mode;
514 else
515 return x->inner_mode_iaf;
516}
517
518struct xfrm_tmpl {
519/* id in template is interpreted as:
520 * daddr - destination of tunnel, may be zero for transport mode.
521 * spi - zero to acquire spi. Not zero if spi is static, then
522 * daddr must be fixed too.
523 * proto - AH/ESP/IPCOMP
524 */
525 struct xfrm_id id;
526
527/* Source address of tunnel. Ignored, if it is not a tunnel. */
528 xfrm_address_t saddr;
529
530 unsigned short encap_family;
531
532 u32 reqid;
533
534/* Mode: transport, tunnel etc. */
535 u8 mode;
536
537/* Sharing mode: unique, this session only, this user only etc. */
538 u8 share;
539
540/* May skip this transfomration if no SA is found */
541 u8 optional;
542
543/* Skip aalgos/ealgos/calgos checks. */
544 u8 allalgs;
545
546/* Bit mask of algos allowed for acquisition */
547 u32 aalgos;
548 u32 ealgos;
549 u32 calgos;
550};
551
552#define XFRM_MAX_DEPTH 6
553#define XFRM_MAX_OFFLOAD_DEPTH 1
554
555struct xfrm_policy_walk_entry {
556 struct list_head all;
557 u8 dead;
558};
559
560struct xfrm_policy_walk {
561 struct xfrm_policy_walk_entry walk;
562 u8 type;
563 u32 seq;
564};
565
566struct xfrm_policy_queue {
567 struct sk_buff_head hold_queue;
568 struct timer_list hold_timer;
569 unsigned long timeout;
570};
571
572struct xfrm_policy {
573 possible_net_t xp_net;
574 struct hlist_node bydst;
575 struct hlist_node byidx;
576
577 /* This lock only affects elements except for entry. */
578 rwlock_t lock;
579 refcount_t refcnt;
580 u32 pos;
581 struct timer_list timer;
582
583 atomic_t genid;
584 u32 priority;
585 u32 index;
586 u32 if_id;
587 struct xfrm_mark mark;
588 struct xfrm_selector selector;
589 struct xfrm_lifetime_cfg lft;
590 struct xfrm_lifetime_cur curlft;
591 struct xfrm_policy_walk_entry walk;
592 struct xfrm_policy_queue polq;
593 bool bydst_reinsert;
594 u8 type;
595 u8 action;
596 u8 flags;
597 u8 xfrm_nr;
598 u16 family;
599 struct xfrm_sec_ctx *security;
600 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
601 struct hlist_node bydst_inexact_list;
602 struct rcu_head rcu;
603};
604
605static inline struct net *xp_net(const struct xfrm_policy *xp)
606{
607 return read_pnet(&xp->xp_net);
608}
609
610struct xfrm_kmaddress {
611 xfrm_address_t local;
612 xfrm_address_t remote;
613 u32 reserved;
614 u16 family;
615};
616
617struct xfrm_migrate {
618 xfrm_address_t old_daddr;
619 xfrm_address_t old_saddr;
620 xfrm_address_t new_daddr;
621 xfrm_address_t new_saddr;
622 u8 proto;
623 u8 mode;
624 u16 reserved;
625 u32 reqid;
626 u16 old_family;
627 u16 new_family;
628};
629
630#define XFRM_KM_TIMEOUT 30
631/* what happened */
632#define XFRM_REPLAY_UPDATE XFRM_AE_CR
633#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
634
635/* default aevent timeout in units of 100ms */
636#define XFRM_AE_ETIME 10
637/* Async Event timer multiplier */
638#define XFRM_AE_ETH_M 10
639/* default seq threshold size */
640#define XFRM_AE_SEQT_SIZE 2
641
642struct xfrm_mgr {
643 struct list_head list;
644 int (*notify)(struct xfrm_state *x, const struct km_event *c);
645 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
646 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
647 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
648 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
649 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
650 int (*migrate)(const struct xfrm_selector *sel,
651 u8 dir, u8 type,
652 const struct xfrm_migrate *m,
653 int num_bundles,
654 const struct xfrm_kmaddress *k,
655 const struct xfrm_encap_tmpl *encap);
656 bool (*is_alive)(const struct km_event *c);
657};
658
659int xfrm_register_km(struct xfrm_mgr *km);
660int xfrm_unregister_km(struct xfrm_mgr *km);
661
662struct xfrm_tunnel_skb_cb {
663 union {
664 struct inet_skb_parm h4;
665 struct inet6_skb_parm h6;
666 } header;
667
668 union {
669 struct ip_tunnel *ip4;
670 struct ip6_tnl *ip6;
671 } tunnel;
672};
673
674#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
675
676/*
677 * This structure is used for the duration where packets are being
678 * transformed by IPsec. As soon as the packet leaves IPsec the
679 * area beyond the generic IP part may be overwritten.
680 */
681struct xfrm_skb_cb {
682 struct xfrm_tunnel_skb_cb header;
683
684 /* Sequence number for replay protection. */
685 union {
686 struct {
687 __u32 low;
688 __u32 hi;
689 } output;
690 struct {
691 __be32 low;
692 __be32 hi;
693 } input;
694 } seq;
695};
696
697#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
698
699/*
700 * This structure is used by the afinfo prepare_input/prepare_output functions
701 * to transmit header information to the mode input/output functions.
702 */
703struct xfrm_mode_skb_cb {
704 struct xfrm_tunnel_skb_cb header;
705
706 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
707 __be16 id;
708 __be16 frag_off;
709
710 /* IP header length (excluding options or extension headers). */
711 u8 ihl;
712
713 /* TOS for IPv4, class for IPv6. */
714 u8 tos;
715
716 /* TTL for IPv4, hop limitfor IPv6. */
717 u8 ttl;
718
719 /* Protocol for IPv4, NH for IPv6. */
720 u8 protocol;
721
722 /* Option length for IPv4, zero for IPv6. */
723 u8 optlen;
724
725 /* Used by IPv6 only, zero for IPv4. */
726 u8 flow_lbl[3];
727};
728
729#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
730
731/*
732 * This structure is used by the input processing to locate the SPI and
733 * related information.
734 */
735struct xfrm_spi_skb_cb {
736 struct xfrm_tunnel_skb_cb header;
737
738 unsigned int daddroff;
739 unsigned int family;
740 __be32 seq;
741};
742
743#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
744
745#ifdef CONFIG_AUDITSYSCALL
746static inline struct audit_buffer *xfrm_audit_start(const char *op)
747{
748 struct audit_buffer *audit_buf = NULL;
749
750 if (audit_enabled == AUDIT_OFF)
751 return NULL;
752 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
753 AUDIT_MAC_IPSEC_EVENT);
754 if (audit_buf == NULL)
755 return NULL;
756 audit_log_format(audit_buf, "op=%s", op);
757 return audit_buf;
758}
759
760static inline void xfrm_audit_helper_usrinfo(bool task_valid,
761 struct audit_buffer *audit_buf)
762{
763 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
764 audit_get_loginuid(current) :
765 INVALID_UID);
766 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
767 AUDIT_SID_UNSET;
768
769 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
770 audit_log_task_context(audit_buf);
771}
772
773void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
774void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
775 bool task_valid);
776void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
777void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
778void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
779 struct sk_buff *skb);
780void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
781 __be32 net_seq);
782void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
783void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
784 __be32 net_seq);
785void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
786 u8 proto);
787#else
788
789static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
790 bool task_valid)
791{
792}
793
794static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
795 bool task_valid)
796{
797}
798
799static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
800 bool task_valid)
801{
802}
803
804static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
805 bool task_valid)
806{
807}
808
809static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
810 struct sk_buff *skb)
811{
812}
813
814static inline void xfrm_audit_state_replay(struct xfrm_state *x,
815 struct sk_buff *skb, __be32 net_seq)
816{
817}
818
819static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
820 u16 family)
821{
822}
823
824static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
825 __be32 net_spi, __be32 net_seq)
826{
827}
828
829static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
830 struct sk_buff *skb, u8 proto)
831{
832}
833#endif /* CONFIG_AUDITSYSCALL */
834
835static inline void xfrm_pol_hold(struct xfrm_policy *policy)
836{
837 if (likely(policy != NULL))
838 refcount_inc(&policy->refcnt);
839}
840
841void xfrm_policy_destroy(struct xfrm_policy *policy);
842
843static inline void xfrm_pol_put(struct xfrm_policy *policy)
844{
845 if (refcount_dec_and_test(&policy->refcnt))
846 xfrm_policy_destroy(policy);
847}
848
849static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
850{
851 int i;
852 for (i = npols - 1; i >= 0; --i)
853 xfrm_pol_put(pols[i]);
854}
855
856void __xfrm_state_destroy(struct xfrm_state *, bool);
857
858static inline void __xfrm_state_put(struct xfrm_state *x)
859{
860 refcount_dec(&x->refcnt);
861}
862
863static inline void xfrm_state_put(struct xfrm_state *x)
864{
865 if (refcount_dec_and_test(&x->refcnt))
866 __xfrm_state_destroy(x, false);
867}
868
869static inline void xfrm_state_put_sync(struct xfrm_state *x)
870{
871 if (refcount_dec_and_test(&x->refcnt))
872 __xfrm_state_destroy(x, true);
873}
874
875static inline void xfrm_state_hold(struct xfrm_state *x)
876{
877 refcount_inc(&x->refcnt);
878}
879
880static inline bool addr_match(const void *token1, const void *token2,
881 unsigned int prefixlen)
882{
883 const __be32 *a1 = token1;
884 const __be32 *a2 = token2;
885 unsigned int pdw;
886 unsigned int pbi;
887
888 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
889 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
890
891 if (pdw)
892 if (memcmp(a1, a2, pdw << 2))
893 return false;
894
895 if (pbi) {
896 __be32 mask;
897
898 mask = htonl((0xffffffff) << (32 - pbi));
899
900 if ((a1[pdw] ^ a2[pdw]) & mask)
901 return false;
902 }
903
904 return true;
905}
906
907static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
908{
909 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
910 if (sizeof(long) == 4 && prefixlen == 0)
911 return true;
912 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
913}
914
915static __inline__
916__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
917{
918 __be16 port;
919 switch(fl->flowi_proto) {
920 case IPPROTO_TCP:
921 case IPPROTO_UDP:
922 case IPPROTO_UDPLITE:
923 case IPPROTO_SCTP:
924 port = uli->ports.sport;
925 break;
926 case IPPROTO_ICMP:
927 case IPPROTO_ICMPV6:
928 port = htons(uli->icmpt.type);
929 break;
930 case IPPROTO_MH:
931 port = htons(uli->mht.type);
932 break;
933 case IPPROTO_GRE:
934 port = htons(ntohl(uli->gre_key) >> 16);
935 break;
936 default:
937 port = 0; /*XXX*/
938 }
939 return port;
940}
941
942static __inline__
943__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
944{
945 __be16 port;
946 switch(fl->flowi_proto) {
947 case IPPROTO_TCP:
948 case IPPROTO_UDP:
949 case IPPROTO_UDPLITE:
950 case IPPROTO_SCTP:
951 port = uli->ports.dport;
952 break;
953 case IPPROTO_ICMP:
954 case IPPROTO_ICMPV6:
955 port = htons(uli->icmpt.code);
956 break;
957 case IPPROTO_GRE:
958 port = htons(ntohl(uli->gre_key) & 0xffff);
959 break;
960 default:
961 port = 0; /*XXX*/
962 }
963 return port;
964}
965
966bool xfrm_selector_match(const struct xfrm_selector *sel,
967 const struct flowi *fl, unsigned short family);
968
969#ifdef CONFIG_SECURITY_NETWORK_XFRM
970/* If neither has a context --> match
971 * Otherwise, both must have a context and the sids, doi, alg must match
972 */
973static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
974{
975 return ((!s1 && !s2) ||
976 (s1 && s2 &&
977 (s1->ctx_sid == s2->ctx_sid) &&
978 (s1->ctx_doi == s2->ctx_doi) &&
979 (s1->ctx_alg == s2->ctx_alg)));
980}
981#else
982static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
983{
984 return true;
985}
986#endif
987
988/* A struct encoding bundle of transformations to apply to some set of flow.
989 *
990 * xdst->child points to the next element of bundle.
991 * dst->xfrm points to an instanse of transformer.
992 *
993 * Due to unfortunate limitations of current routing cache, which we
994 * have no time to fix, it mirrors struct rtable and bound to the same
995 * routing key, including saddr,daddr. However, we can have many of
996 * bundles differing by session id. All the bundles grow from a parent
997 * policy rule.
998 */
999struct xfrm_dst {
1000 union {
1001 struct dst_entry dst;
1002 struct rtable rt;
1003 struct rt6_info rt6;
1004 } u;
1005 struct dst_entry *route;
1006 struct dst_entry *child;
1007 struct dst_entry *path;
1008 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1009 int num_pols, num_xfrms;
1010 u32 xfrm_genid;
1011 u32 policy_genid;
1012 u32 route_mtu_cached;
1013 u32 child_mtu_cached;
1014 u32 route_cookie;
1015 u32 path_cookie;
1016};
1017
1018static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1019{
1020#ifdef CONFIG_XFRM
1021 if (dst->xfrm) {
1022 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1023
1024 return xdst->path;
1025 }
1026#endif
1027 return (struct dst_entry *) dst;
1028}
1029
1030static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1031{
1032#ifdef CONFIG_XFRM
1033 if (dst->xfrm) {
1034 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1035 return xdst->child;
1036 }
1037#endif
1038 return NULL;
1039}
1040
1041#ifdef CONFIG_XFRM
1042static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1043{
1044 xdst->child = child;
1045}
1046
1047static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1048{
1049 xfrm_pols_put(xdst->pols, xdst->num_pols);
1050 dst_release(xdst->route);
1051 if (likely(xdst->u.dst.xfrm))
1052 xfrm_state_put(xdst->u.dst.xfrm);
1053}
1054#endif
1055
1056void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1057
1058struct xfrm_if_parms {
1059 char name[IFNAMSIZ]; /* name of XFRM device */
1060 int link; /* ifindex of underlying L2 interface */
1061 u32 if_id; /* interface identifyer */
1062};
1063
1064struct xfrm_if {
1065 struct xfrm_if __rcu *next; /* next interface in list */
1066 struct net_device *dev; /* virtual device associated with interface */
1067 struct net_device *phydev; /* physical device */
1068 struct net *net; /* netns for packet i/o */
1069 struct xfrm_if_parms p; /* interface parms */
1070
1071 struct gro_cells gro_cells;
1072};
1073
1074struct xfrm_offload {
1075 /* Output sequence number for replay protection on offloading. */
1076 struct {
1077 __u32 low;
1078 __u32 hi;
1079 } seq;
1080
1081 __u32 flags;
1082#define SA_DELETE_REQ 1
1083#define CRYPTO_DONE 2
1084#define CRYPTO_NEXT_DONE 4
1085#define CRYPTO_FALLBACK 8
1086#define XFRM_GSO_SEGMENT 16
1087#define XFRM_GRO 32
1088#define XFRM_ESP_NO_TRAILER 64
1089#define XFRM_DEV_RESUME 128
1090
1091 __u32 status;
1092#define CRYPTO_SUCCESS 1
1093#define CRYPTO_GENERIC_ERROR 2
1094#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1095#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1096#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1097#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1098#define CRYPTO_INVALID_PACKET_SYNTAX 64
1099#define CRYPTO_INVALID_PROTOCOL 128
1100
1101 __u8 proto;
1102};
1103
1104struct sec_path {
1105 int len;
1106 int olen;
1107
1108 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1109 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1110};
1111
1112struct sec_path *secpath_set(struct sk_buff *skb);
1113
1114static inline void
1115secpath_reset(struct sk_buff *skb)
1116{
1117#ifdef CONFIG_XFRM
1118 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1119#endif
1120}
1121
1122static inline int
1123xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1124{
1125 switch (family) {
1126 case AF_INET:
1127 return addr->a4 == 0;
1128 case AF_INET6:
1129 return ipv6_addr_any(&addr->in6);
1130 }
1131 return 0;
1132}
1133
1134static inline int
1135__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1136{
1137 return (tmpl->saddr.a4 &&
1138 tmpl->saddr.a4 != x->props.saddr.a4);
1139}
1140
1141static inline int
1142__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1143{
1144 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1145 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1146}
1147
1148static inline int
1149xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1150{
1151 switch (family) {
1152 case AF_INET:
1153 return __xfrm4_state_addr_cmp(tmpl, x);
1154 case AF_INET6:
1155 return __xfrm6_state_addr_cmp(tmpl, x);
1156 }
1157 return !0;
1158}
1159
1160#ifdef CONFIG_XFRM
1161int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1162 unsigned short family);
1163
1164static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1165 struct sk_buff *skb,
1166 unsigned int family, int reverse)
1167{
1168 struct net *net = dev_net(skb->dev);
1169 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1170
1171 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1172 return __xfrm_policy_check(sk, ndir, skb, family);
1173
1174 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1175 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1176 __xfrm_policy_check(sk, ndir, skb, family);
1177}
1178
1179static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1180{
1181 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1182}
1183
1184static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1185{
1186 return xfrm_policy_check(sk, dir, skb, AF_INET);
1187}
1188
1189static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1190{
1191 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1192}
1193
1194static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1195 struct sk_buff *skb)
1196{
1197 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1198}
1199
1200static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1201 struct sk_buff *skb)
1202{
1203 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1204}
1205
1206int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1207 unsigned int family, int reverse);
1208
1209static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1210 unsigned int family)
1211{
1212 return __xfrm_decode_session(skb, fl, family, 0);
1213}
1214
1215static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1216 struct flowi *fl,
1217 unsigned int family)
1218{
1219 return __xfrm_decode_session(skb, fl, family, 1);
1220}
1221
1222int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1223
1224static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1225{
1226 struct net *net = dev_net(skb->dev);
1227
1228 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1229 (skb_dst(skb)->flags & DST_NOXFRM) ||
1230 __xfrm_route_forward(skb, family);
1231}
1232
1233static inline int xfrm4_route_forward(struct sk_buff *skb)
1234{
1235 return xfrm_route_forward(skb, AF_INET);
1236}
1237
1238static inline int xfrm6_route_forward(struct sk_buff *skb)
1239{
1240 return xfrm_route_forward(skb, AF_INET6);
1241}
1242
1243int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1244
1245static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1246{
1247 sk->sk_policy[0] = NULL;
1248 sk->sk_policy[1] = NULL;
1249 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1250 return __xfrm_sk_clone_policy(sk, osk);
1251 return 0;
1252}
1253
1254int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1255
1256static inline void xfrm_sk_free_policy(struct sock *sk)
1257{
1258 struct xfrm_policy *pol;
1259
1260 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1261 if (unlikely(pol != NULL)) {
1262 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1263 sk->sk_policy[0] = NULL;
1264 }
1265 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1266 if (unlikely(pol != NULL)) {
1267 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1268 sk->sk_policy[1] = NULL;
1269 }
1270}
1271
1272#else
1273
1274static inline void xfrm_sk_free_policy(struct sock *sk) {}
1275static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1276static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1277static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1278static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1279{
1280 return 1;
1281}
1282static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1283{
1284 return 1;
1285}
1286static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1287{
1288 return 1;
1289}
1290static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1291 struct flowi *fl,
1292 unsigned int family)
1293{
1294 return -ENOSYS;
1295}
1296static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1297 struct sk_buff *skb)
1298{
1299 return 1;
1300}
1301static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1302 struct sk_buff *skb)
1303{
1304 return 1;
1305}
1306#endif
1307
1308static __inline__
1309xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1310{
1311 switch (family){
1312 case AF_INET:
1313 return (xfrm_address_t *)&fl->u.ip4.daddr;
1314 case AF_INET6:
1315 return (xfrm_address_t *)&fl->u.ip6.daddr;
1316 }
1317 return NULL;
1318}
1319
1320static __inline__
1321xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1322{
1323 switch (family){
1324 case AF_INET:
1325 return (xfrm_address_t *)&fl->u.ip4.saddr;
1326 case AF_INET6:
1327 return (xfrm_address_t *)&fl->u.ip6.saddr;
1328 }
1329 return NULL;
1330}
1331
1332static __inline__
1333void xfrm_flowi_addr_get(const struct flowi *fl,
1334 xfrm_address_t *saddr, xfrm_address_t *daddr,
1335 unsigned short family)
1336{
1337 switch(family) {
1338 case AF_INET:
1339 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1340 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1341 break;
1342 case AF_INET6:
1343 saddr->in6 = fl->u.ip6.saddr;
1344 daddr->in6 = fl->u.ip6.daddr;
1345 break;
1346 }
1347}
1348
1349static __inline__ int
1350__xfrm4_state_addr_check(const struct xfrm_state *x,
1351 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1352{
1353 if (daddr->a4 == x->id.daddr.a4 &&
1354 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1355 return 1;
1356 return 0;
1357}
1358
1359static __inline__ int
1360__xfrm6_state_addr_check(const struct xfrm_state *x,
1361 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1362{
1363 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1364 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1365 ipv6_addr_any((struct in6_addr *)saddr) ||
1366 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1367 return 1;
1368 return 0;
1369}
1370
1371static __inline__ int
1372xfrm_state_addr_check(const struct xfrm_state *x,
1373 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1374 unsigned short family)
1375{
1376 switch (family) {
1377 case AF_INET:
1378 return __xfrm4_state_addr_check(x, daddr, saddr);
1379 case AF_INET6:
1380 return __xfrm6_state_addr_check(x, daddr, saddr);
1381 }
1382 return 0;
1383}
1384
1385static __inline__ int
1386xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1387 unsigned short family)
1388{
1389 switch (family) {
1390 case AF_INET:
1391 return __xfrm4_state_addr_check(x,
1392 (const xfrm_address_t *)&fl->u.ip4.daddr,
1393 (const xfrm_address_t *)&fl->u.ip4.saddr);
1394 case AF_INET6:
1395 return __xfrm6_state_addr_check(x,
1396 (const xfrm_address_t *)&fl->u.ip6.daddr,
1397 (const xfrm_address_t *)&fl->u.ip6.saddr);
1398 }
1399 return 0;
1400}
1401
1402static inline int xfrm_state_kern(const struct xfrm_state *x)
1403{
1404 return atomic_read(&x->tunnel_users);
1405}
1406
1407static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1408{
1409 return (!userproto || proto == userproto ||
1410 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1411 proto == IPPROTO_ESP ||
1412 proto == IPPROTO_COMP)));
1413}
1414
1415/*
1416 * xfrm algorithm information
1417 */
1418struct xfrm_algo_aead_info {
1419 char *geniv;
1420 u16 icv_truncbits;
1421};
1422
1423struct xfrm_algo_auth_info {
1424 u16 icv_truncbits;
1425 u16 icv_fullbits;
1426};
1427
1428struct xfrm_algo_encr_info {
1429 char *geniv;
1430 u16 blockbits;
1431 u16 defkeybits;
1432};
1433
1434struct xfrm_algo_comp_info {
1435 u16 threshold;
1436};
1437
1438struct xfrm_algo_desc {
1439 char *name;
1440 char *compat;
1441 u8 available:1;
1442 u8 pfkey_supported:1;
1443 union {
1444 struct xfrm_algo_aead_info aead;
1445 struct xfrm_algo_auth_info auth;
1446 struct xfrm_algo_encr_info encr;
1447 struct xfrm_algo_comp_info comp;
1448 } uinfo;
1449 struct sadb_alg desc;
1450};
1451
1452/* XFRM protocol handlers. */
1453struct xfrm4_protocol {
1454 int (*handler)(struct sk_buff *skb);
1455 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1456 int encap_type);
1457 int (*cb_handler)(struct sk_buff *skb, int err);
1458 int (*err_handler)(struct sk_buff *skb, u32 info);
1459
1460 struct xfrm4_protocol __rcu *next;
1461 int priority;
1462};
1463
1464struct xfrm6_protocol {
1465 int (*handler)(struct sk_buff *skb);
1466 int (*cb_handler)(struct sk_buff *skb, int err);
1467 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1468 u8 type, u8 code, int offset, __be32 info);
1469
1470 struct xfrm6_protocol __rcu *next;
1471 int priority;
1472};
1473
1474/* XFRM tunnel handlers. */
1475struct xfrm_tunnel {
1476 int (*handler)(struct sk_buff *skb);
1477 int (*err_handler)(struct sk_buff *skb, u32 info);
1478
1479 struct xfrm_tunnel __rcu *next;
1480 int priority;
1481};
1482
1483struct xfrm6_tunnel {
1484 int (*handler)(struct sk_buff *skb);
1485 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1486 u8 type, u8 code, int offset, __be32 info);
1487 struct xfrm6_tunnel __rcu *next;
1488 int priority;
1489};
1490
1491void xfrm_init(void);
1492void xfrm4_init(void);
1493int xfrm_state_init(struct net *net);
1494void xfrm_state_fini(struct net *net);
1495void xfrm4_state_init(void);
1496void xfrm4_protocol_init(void);
1497#ifdef CONFIG_XFRM
1498int xfrm6_init(void);
1499void xfrm6_fini(void);
1500int xfrm6_state_init(void);
1501void xfrm6_state_fini(void);
1502int xfrm6_protocol_init(void);
1503void xfrm6_protocol_fini(void);
1504#else
1505static inline int xfrm6_init(void)
1506{
1507 return 0;
1508}
1509static inline void xfrm6_fini(void)
1510{
1511 ;
1512}
1513#endif
1514
1515#ifdef CONFIG_XFRM_STATISTICS
1516int xfrm_proc_init(struct net *net);
1517void xfrm_proc_fini(struct net *net);
1518#endif
1519
1520int xfrm_sysctl_init(struct net *net);
1521#ifdef CONFIG_SYSCTL
1522void xfrm_sysctl_fini(struct net *net);
1523#else
1524static inline void xfrm_sysctl_fini(struct net *net)
1525{
1526}
1527#endif
1528
1529void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1530 struct xfrm_address_filter *filter);
1531int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1532 int (*func)(struct xfrm_state *, int, void*), void *);
1533void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1534struct xfrm_state *xfrm_state_alloc(struct net *net);
1535void xfrm_state_free(struct xfrm_state *x);
1536struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1537 const xfrm_address_t *saddr,
1538 const struct flowi *fl,
1539 struct xfrm_tmpl *tmpl,
1540 struct xfrm_policy *pol, int *err,
1541 unsigned short family, u32 if_id);
1542struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1543 xfrm_address_t *daddr,
1544 xfrm_address_t *saddr,
1545 unsigned short family,
1546 u8 mode, u8 proto, u32 reqid);
1547struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1548 unsigned short family);
1549int xfrm_state_check_expire(struct xfrm_state *x);
1550void xfrm_state_insert(struct xfrm_state *x);
1551int xfrm_state_add(struct xfrm_state *x);
1552int xfrm_state_update(struct xfrm_state *x);
1553struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1554 const xfrm_address_t *daddr, __be32 spi,
1555 u8 proto, unsigned short family);
1556struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1557 const xfrm_address_t *daddr,
1558 const xfrm_address_t *saddr,
1559 u8 proto,
1560 unsigned short family);
1561#ifdef CONFIG_XFRM_SUB_POLICY
1562int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1563 unsigned short family, struct net *net);
1564int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1565 unsigned short family);
1566#else
1567static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1568 int n, unsigned short family, struct net *net)
1569{
1570 return -ENOSYS;
1571}
1572
1573static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1574 int n, unsigned short family)
1575{
1576 return -ENOSYS;
1577}
1578#endif
1579
1580struct xfrmk_sadinfo {
1581 u32 sadhcnt; /* current hash bkts */
1582 u32 sadhmcnt; /* max allowed hash bkts */
1583 u32 sadcnt; /* current running count */
1584};
1585
1586struct xfrmk_spdinfo {
1587 u32 incnt;
1588 u32 outcnt;
1589 u32 fwdcnt;
1590 u32 inscnt;
1591 u32 outscnt;
1592 u32 fwdscnt;
1593 u32 spdhcnt;
1594 u32 spdhmcnt;
1595};
1596
1597struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1598int xfrm_state_delete(struct xfrm_state *x);
1599int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1600int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1601void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1602void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1603u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1604int xfrm_init_replay(struct xfrm_state *x);
1605int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1606int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1607int xfrm_init_state(struct xfrm_state *x);
1608int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1609int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1610int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1611int xfrm_trans_queue(struct sk_buff *skb,
1612 int (*finish)(struct net *, struct sock *,
1613 struct sk_buff *));
1614int xfrm_output_resume(struct sk_buff *skb, int err);
1615int xfrm_output(struct sock *sk, struct sk_buff *skb);
1616int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1617void xfrm_local_error(struct sk_buff *skb, int mtu);
1618int xfrm4_extract_header(struct sk_buff *skb);
1619int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1620int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1621 int encap_type);
1622int xfrm4_transport_finish(struct sk_buff *skb, int async);
1623int xfrm4_rcv(struct sk_buff *skb);
1624int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1625
1626static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1627{
1628 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1629 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1630 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1631 return xfrm_input(skb, nexthdr, spi, 0);
1632}
1633
1634int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1635int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1636int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1637int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1638int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1639int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1640int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1641int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1642int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1643void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1644int xfrm6_extract_header(struct sk_buff *skb);
1645int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1646int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1647 struct ip6_tnl *t);
1648int xfrm6_transport_finish(struct sk_buff *skb, int async);
1649int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1650int xfrm6_rcv(struct sk_buff *skb);
1651int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1652 xfrm_address_t *saddr, u8 proto);
1653void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1654int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1655int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1656int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1657int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1658int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1659__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1660__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1661int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1662int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1663int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1664int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1665int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1666 u8 **prevhdr);
1667
1668#ifdef CONFIG_XFRM
1669int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1670int xfrm_user_policy(struct sock *sk, int optname,
1671 u8 __user *optval, int optlen);
1672#else
1673static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1674{
1675 return -ENOPROTOOPT;
1676}
1677
1678static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1679{
1680 /* should not happen */
1681 kfree_skb(skb);
1682 return 0;
1683}
1684#endif
1685
1686struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1687 const xfrm_address_t *saddr,
1688 const xfrm_address_t *daddr,
1689 int family, u32 mark);
1690
1691struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1692
1693void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1694int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1695 int (*func)(struct xfrm_policy *, int, int, void*),
1696 void *);
1697void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1698int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1699struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1700 u8 type, int dir,
1701 struct xfrm_selector *sel,
1702 struct xfrm_sec_ctx *ctx, int delete,
1703 int *err);
1704struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1705 int dir, u32 id, int delete, int *err);
1706int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1707void xfrm_policy_hash_rebuild(struct net *net);
1708u32 xfrm_get_acqseq(void);
1709int verify_spi_info(u8 proto, u32 min, u32 max);
1710int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1711struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1712 u8 mode, u32 reqid, u32 if_id, u8 proto,
1713 const xfrm_address_t *daddr,
1714 const xfrm_address_t *saddr, int create,
1715 unsigned short family);
1716int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1717
1718#ifdef CONFIG_XFRM_MIGRATE
1719int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1720 const struct xfrm_migrate *m, int num_bundles,
1721 const struct xfrm_kmaddress *k,
1722 const struct xfrm_encap_tmpl *encap);
1723struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1724struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1725 struct xfrm_migrate *m,
1726 struct xfrm_encap_tmpl *encap);
1727int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1728 struct xfrm_migrate *m, int num_bundles,
1729 struct xfrm_kmaddress *k, struct net *net,
1730 struct xfrm_encap_tmpl *encap);
1731#endif
1732
1733int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1734void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1735int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1736 xfrm_address_t *addr);
1737
1738void xfrm_input_init(void);
1739int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1740
1741void xfrm_probe_algs(void);
1742int xfrm_count_pfkey_auth_supported(void);
1743int xfrm_count_pfkey_enc_supported(void);
1744struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1745struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1746struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1747struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1748struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1749struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1750struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1751struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1752struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1753 int probe);
1754
1755static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1756 const xfrm_address_t *b)
1757{
1758 return ipv6_addr_equal((const struct in6_addr *)a,
1759 (const struct in6_addr *)b);
1760}
1761
1762static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1763 const xfrm_address_t *b,
1764 sa_family_t family)
1765{
1766 switch (family) {
1767 default:
1768 case AF_INET:
1769 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1770 case AF_INET6:
1771 return xfrm6_addr_equal(a, b);
1772 }
1773}
1774
1775static inline int xfrm_policy_id2dir(u32 index)
1776{
1777 return index & 7;
1778}
1779
1780#ifdef CONFIG_XFRM
1781static inline int xfrm_aevent_is_on(struct net *net)
1782{
1783 struct sock *nlsk;
1784 int ret = 0;
1785
1786 rcu_read_lock();
1787 nlsk = rcu_dereference(net->xfrm.nlsk);
1788 if (nlsk)
1789 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1790 rcu_read_unlock();
1791 return ret;
1792}
1793
1794static inline int xfrm_acquire_is_on(struct net *net)
1795{
1796 struct sock *nlsk;
1797 int ret = 0;
1798
1799 rcu_read_lock();
1800 nlsk = rcu_dereference(net->xfrm.nlsk);
1801 if (nlsk)
1802 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1803 rcu_read_unlock();
1804
1805 return ret;
1806}
1807#endif
1808
1809static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1810{
1811 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1812}
1813
1814static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1815{
1816 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1817}
1818
1819static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1820{
1821 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1822}
1823
1824static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1825{
1826 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1827}
1828
1829#ifdef CONFIG_XFRM_MIGRATE
1830static inline int xfrm_replay_clone(struct xfrm_state *x,
1831 struct xfrm_state *orig)
1832{
1833 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1834 GFP_KERNEL);
1835 if (!x->replay_esn)
1836 return -ENOMEM;
1837
1838 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1839 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1840
1841 x->preplay_esn = kmemdup(x->replay_esn,
1842 xfrm_replay_state_esn_len(x->replay_esn),
1843 GFP_KERNEL);
1844 if (!x->preplay_esn) {
1845 kfree(x->replay_esn);
1846 return -ENOMEM;
1847 }
1848
1849 return 0;
1850}
1851
1852static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1853{
1854 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1855}
1856
1857
1858static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1859{
1860 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1861}
1862
1863static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1864{
1865 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1866}
1867
1868static inline void xfrm_states_put(struct xfrm_state **states, int n)
1869{
1870 int i;
1871 for (i = 0; i < n; i++)
1872 xfrm_state_put(*(states + i));
1873}
1874
1875static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1876{
1877 int i;
1878 for (i = 0; i < n; i++)
1879 xfrm_state_delete(*(states + i));
1880}
1881#endif
1882
1883#ifdef CONFIG_XFRM
1884static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1885{
1886 struct sec_path *sp = skb_sec_path(skb);
1887
1888 return sp->xvec[sp->len - 1];
1889}
1890#endif
1891
1892static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1893{
1894#ifdef CONFIG_XFRM
1895 struct sec_path *sp = skb_sec_path(skb);
1896
1897 if (!sp || !sp->olen || sp->len != sp->olen)
1898 return NULL;
1899
1900 return &sp->ovec[sp->olen - 1];
1901#else
1902 return NULL;
1903#endif
1904}
1905
1906void __init xfrm_dev_init(void);
1907
1908#ifdef CONFIG_XFRM_OFFLOAD
1909void xfrm_dev_resume(struct sk_buff *skb);
1910void xfrm_dev_backlog(struct softnet_data *sd);
1911struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1912int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1913 struct xfrm_user_offload *xuo);
1914bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1915
1916static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1917{
1918 struct xfrm_state_offload *xso = &x->xso;
1919
1920 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1921 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1922}
1923
1924static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1925{
1926 struct xfrm_state *x = dst->xfrm;
1927 struct xfrm_dst *xdst;
1928
1929 if (!x || !x->type_offload)
1930 return false;
1931
1932 xdst = (struct xfrm_dst *) dst;
1933 if (!x->xso.offload_handle && !xdst->child->xfrm)
1934 return true;
1935 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1936 !xdst->child->xfrm)
1937 return true;
1938
1939 return false;
1940}
1941
1942static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1943{
1944 struct xfrm_state_offload *xso = &x->xso;
1945
1946 if (xso->dev)
1947 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1948}
1949
1950static inline void xfrm_dev_state_free(struct xfrm_state *x)
1951{
1952 struct xfrm_state_offload *xso = &x->xso;
1953 struct net_device *dev = xso->dev;
1954
1955 if (dev && dev->xfrmdev_ops) {
1956 if (dev->xfrmdev_ops->xdo_dev_state_free)
1957 dev->xfrmdev_ops->xdo_dev_state_free(x);
1958 xso->dev = NULL;
1959 dev_put(dev);
1960 }
1961}
1962#else
1963static inline void xfrm_dev_resume(struct sk_buff *skb)
1964{
1965}
1966
1967static inline void xfrm_dev_backlog(struct softnet_data *sd)
1968{
1969}
1970
1971static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1972{
1973 return skb;
1974}
1975
1976static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1977{
1978 return 0;
1979}
1980
1981static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1982{
1983}
1984
1985static inline void xfrm_dev_state_free(struct xfrm_state *x)
1986{
1987}
1988
1989static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1990{
1991 return false;
1992}
1993
1994static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1995{
1996}
1997
1998static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1999{
2000 return false;
2001}
2002#endif
2003
2004static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2005{
2006 if (attrs[XFRMA_MARK])
2007 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2008 else
2009 m->v = m->m = 0;
2010
2011 return m->v & m->m;
2012}
2013
2014static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2015{
2016 int ret = 0;
2017
2018 if (m->m | m->v)
2019 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2020 return ret;
2021}
2022
2023static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2024{
2025 struct xfrm_mark *m = &x->props.smark;
2026
2027 return (m->v & m->m) | (mark & ~m->m);
2028}
2029
2030static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2031{
2032 int ret = 0;
2033
2034 if (if_id)
2035 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2036 return ret;
2037}
2038
2039static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2040 unsigned int family)
2041{
2042 bool tunnel = false;
2043
2044 switch(family) {
2045 case AF_INET:
2046 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2047 tunnel = true;
2048 break;
2049 case AF_INET6:
2050 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2051 tunnel = true;
2052 break;
2053 }
2054 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2055 return -EINVAL;
2056
2057 return 0;
2058}
2059#endif /* _NET_XFRM_H */
2060