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 struct timer_list timer;
581
582 atomic_t genid;
583 u32 priority;
584 u32 index;
585 u32 if_id;
586 struct xfrm_mark mark;
587 struct xfrm_selector selector;
588 struct xfrm_lifetime_cfg lft;
589 struct xfrm_lifetime_cur curlft;
590 struct xfrm_policy_walk_entry walk;
591 struct xfrm_policy_queue polq;
592 u8 type;
593 u8 action;
594 u8 flags;
595 u8 xfrm_nr;
596 u16 family;
597 struct xfrm_sec_ctx *security;
598 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
599 struct rcu_head rcu;
600};
601
602static inline struct net *xp_net(const struct xfrm_policy *xp)
603{
604 return read_pnet(&xp->xp_net);
605}
606
607struct xfrm_kmaddress {
608 xfrm_address_t local;
609 xfrm_address_t remote;
610 u32 reserved;
611 u16 family;
612};
613
614struct xfrm_migrate {
615 xfrm_address_t old_daddr;
616 xfrm_address_t old_saddr;
617 xfrm_address_t new_daddr;
618 xfrm_address_t new_saddr;
619 u8 proto;
620 u8 mode;
621 u16 reserved;
622 u32 reqid;
623 u16 old_family;
624 u16 new_family;
625};
626
627#define XFRM_KM_TIMEOUT 30
628/* what happened */
629#define XFRM_REPLAY_UPDATE XFRM_AE_CR
630#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
631
632/* default aevent timeout in units of 100ms */
633#define XFRM_AE_ETIME 10
634/* Async Event timer multiplier */
635#define XFRM_AE_ETH_M 10
636/* default seq threshold size */
637#define XFRM_AE_SEQT_SIZE 2
638
639struct xfrm_mgr {
640 struct list_head list;
641 int (*notify)(struct xfrm_state *x, const struct km_event *c);
642 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
643 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
644 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
645 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
646 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
647 int (*migrate)(const struct xfrm_selector *sel,
648 u8 dir, u8 type,
649 const struct xfrm_migrate *m,
650 int num_bundles,
651 const struct xfrm_kmaddress *k,
652 const struct xfrm_encap_tmpl *encap);
653 bool (*is_alive)(const struct km_event *c);
654};
655
656int xfrm_register_km(struct xfrm_mgr *km);
657int xfrm_unregister_km(struct xfrm_mgr *km);
658
659struct xfrm_tunnel_skb_cb {
660 union {
661 struct inet_skb_parm h4;
662 struct inet6_skb_parm h6;
663 } header;
664
665 union {
666 struct ip_tunnel *ip4;
667 struct ip6_tnl *ip6;
668 } tunnel;
669};
670
671#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
672
673/*
674 * This structure is used for the duration where packets are being
675 * transformed by IPsec. As soon as the packet leaves IPsec the
676 * area beyond the generic IP part may be overwritten.
677 */
678struct xfrm_skb_cb {
679 struct xfrm_tunnel_skb_cb header;
680
681 /* Sequence number for replay protection. */
682 union {
683 struct {
684 __u32 low;
685 __u32 hi;
686 } output;
687 struct {
688 __be32 low;
689 __be32 hi;
690 } input;
691 } seq;
692};
693
694#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
695
696/*
697 * This structure is used by the afinfo prepare_input/prepare_output functions
698 * to transmit header information to the mode input/output functions.
699 */
700struct xfrm_mode_skb_cb {
701 struct xfrm_tunnel_skb_cb header;
702
703 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
704 __be16 id;
705 __be16 frag_off;
706
707 /* IP header length (excluding options or extension headers). */
708 u8 ihl;
709
710 /* TOS for IPv4, class for IPv6. */
711 u8 tos;
712
713 /* TTL for IPv4, hop limitfor IPv6. */
714 u8 ttl;
715
716 /* Protocol for IPv4, NH for IPv6. */
717 u8 protocol;
718
719 /* Option length for IPv4, zero for IPv6. */
720 u8 optlen;
721
722 /* Used by IPv6 only, zero for IPv4. */
723 u8 flow_lbl[3];
724};
725
726#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
727
728/*
729 * This structure is used by the input processing to locate the SPI and
730 * related information.
731 */
732struct xfrm_spi_skb_cb {
733 struct xfrm_tunnel_skb_cb header;
734
735 unsigned int daddroff;
736 unsigned int family;
737 __be32 seq;
738};
739
740#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
741
742#ifdef CONFIG_AUDITSYSCALL
743static inline struct audit_buffer *xfrm_audit_start(const char *op)
744{
745 struct audit_buffer *audit_buf = NULL;
746
747 if (audit_enabled == AUDIT_OFF)
748 return NULL;
749 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
750 AUDIT_MAC_IPSEC_EVENT);
751 if (audit_buf == NULL)
752 return NULL;
753 audit_log_format(audit_buf, "op=%s", op);
754 return audit_buf;
755}
756
757static inline void xfrm_audit_helper_usrinfo(bool task_valid,
758 struct audit_buffer *audit_buf)
759{
760 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
761 audit_get_loginuid(current) :
762 INVALID_UID);
763 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
764 AUDIT_SID_UNSET;
765
766 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
767 audit_log_task_context(audit_buf);
768}
769
770void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
771void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
772 bool task_valid);
773void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
774void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
775void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
776 struct sk_buff *skb);
777void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
778 __be32 net_seq);
779void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
780void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
781 __be32 net_seq);
782void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
783 u8 proto);
784#else
785
786static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
787 bool task_valid)
788{
789}
790
791static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
792 bool task_valid)
793{
794}
795
796static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
797 bool task_valid)
798{
799}
800
801static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
802 bool task_valid)
803{
804}
805
806static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
807 struct sk_buff *skb)
808{
809}
810
811static inline void xfrm_audit_state_replay(struct xfrm_state *x,
812 struct sk_buff *skb, __be32 net_seq)
813{
814}
815
816static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
817 u16 family)
818{
819}
820
821static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
822 __be32 net_spi, __be32 net_seq)
823{
824}
825
826static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
827 struct sk_buff *skb, u8 proto)
828{
829}
830#endif /* CONFIG_AUDITSYSCALL */
831
832static inline void xfrm_pol_hold(struct xfrm_policy *policy)
833{
834 if (likely(policy != NULL))
835 refcount_inc(&policy->refcnt);
836}
837
838void xfrm_policy_destroy(struct xfrm_policy *policy);
839
840static inline void xfrm_pol_put(struct xfrm_policy *policy)
841{
842 if (refcount_dec_and_test(&policy->refcnt))
843 xfrm_policy_destroy(policy);
844}
845
846static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
847{
848 int i;
849 for (i = npols - 1; i >= 0; --i)
850 xfrm_pol_put(pols[i]);
851}
852
853void __xfrm_state_destroy(struct xfrm_state *);
854
855static inline void __xfrm_state_put(struct xfrm_state *x)
856{
857 refcount_dec(&x->refcnt);
858}
859
860static inline void xfrm_state_put(struct xfrm_state *x)
861{
862 if (refcount_dec_and_test(&x->refcnt))
863 __xfrm_state_destroy(x);
864}
865
866static inline void xfrm_state_hold(struct xfrm_state *x)
867{
868 refcount_inc(&x->refcnt);
869}
870
871static inline bool addr_match(const void *token1, const void *token2,
872 unsigned int prefixlen)
873{
874 const __be32 *a1 = token1;
875 const __be32 *a2 = token2;
876 unsigned int pdw;
877 unsigned int pbi;
878
879 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
880 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
881
882 if (pdw)
883 if (memcmp(a1, a2, pdw << 2))
884 return false;
885
886 if (pbi) {
887 __be32 mask;
888
889 mask = htonl((0xffffffff) << (32 - pbi));
890
891 if ((a1[pdw] ^ a2[pdw]) & mask)
892 return false;
893 }
894
895 return true;
896}
897
898static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
899{
900 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
901 if (sizeof(long) == 4 && prefixlen == 0)
902 return true;
903 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
904}
905
906static __inline__
907__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
908{
909 __be16 port;
910 switch(fl->flowi_proto) {
911 case IPPROTO_TCP:
912 case IPPROTO_UDP:
913 case IPPROTO_UDPLITE:
914 case IPPROTO_SCTP:
915 port = uli->ports.sport;
916 break;
917 case IPPROTO_ICMP:
918 case IPPROTO_ICMPV6:
919 port = htons(uli->icmpt.type);
920 break;
921 case IPPROTO_MH:
922 port = htons(uli->mht.type);
923 break;
924 case IPPROTO_GRE:
925 port = htons(ntohl(uli->gre_key) >> 16);
926 break;
927 default:
928 port = 0; /*XXX*/
929 }
930 return port;
931}
932
933static __inline__
934__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
935{
936 __be16 port;
937 switch(fl->flowi_proto) {
938 case IPPROTO_TCP:
939 case IPPROTO_UDP:
940 case IPPROTO_UDPLITE:
941 case IPPROTO_SCTP:
942 port = uli->ports.dport;
943 break;
944 case IPPROTO_ICMP:
945 case IPPROTO_ICMPV6:
946 port = htons(uli->icmpt.code);
947 break;
948 case IPPROTO_GRE:
949 port = htons(ntohl(uli->gre_key) & 0xffff);
950 break;
951 default:
952 port = 0; /*XXX*/
953 }
954 return port;
955}
956
957bool xfrm_selector_match(const struct xfrm_selector *sel,
958 const struct flowi *fl, unsigned short family);
959
960#ifdef CONFIG_SECURITY_NETWORK_XFRM
961/* If neither has a context --> match
962 * Otherwise, both must have a context and the sids, doi, alg must match
963 */
964static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
965{
966 return ((!s1 && !s2) ||
967 (s1 && s2 &&
968 (s1->ctx_sid == s2->ctx_sid) &&
969 (s1->ctx_doi == s2->ctx_doi) &&
970 (s1->ctx_alg == s2->ctx_alg)));
971}
972#else
973static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
974{
975 return true;
976}
977#endif
978
979/* A struct encoding bundle of transformations to apply to some set of flow.
980 *
981 * xdst->child points to the next element of bundle.
982 * dst->xfrm points to an instanse of transformer.
983 *
984 * Due to unfortunate limitations of current routing cache, which we
985 * have no time to fix, it mirrors struct rtable and bound to the same
986 * routing key, including saddr,daddr. However, we can have many of
987 * bundles differing by session id. All the bundles grow from a parent
988 * policy rule.
989 */
990struct xfrm_dst {
991 union {
992 struct dst_entry dst;
993 struct rtable rt;
994 struct rt6_info rt6;
995 } u;
996 struct dst_entry *route;
997 struct dst_entry *child;
998 struct dst_entry *path;
999 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1000 int num_pols, num_xfrms;
1001 u32 xfrm_genid;
1002 u32 policy_genid;
1003 u32 route_mtu_cached;
1004 u32 child_mtu_cached;
1005 u32 route_cookie;
1006 u32 path_cookie;
1007};
1008
1009static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1010{
1011#ifdef CONFIG_XFRM
1012 if (dst->xfrm) {
1013 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1014
1015 return xdst->path;
1016 }
1017#endif
1018 return (struct dst_entry *) dst;
1019}
1020
1021static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1022{
1023#ifdef CONFIG_XFRM
1024 if (dst->xfrm) {
1025 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1026 return xdst->child;
1027 }
1028#endif
1029 return NULL;
1030}
1031
1032#ifdef CONFIG_XFRM
1033static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1034{
1035 xdst->child = child;
1036}
1037
1038static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1039{
1040 xfrm_pols_put(xdst->pols, xdst->num_pols);
1041 dst_release(xdst->route);
1042 if (likely(xdst->u.dst.xfrm))
1043 xfrm_state_put(xdst->u.dst.xfrm);
1044}
1045#endif
1046
1047void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1048
1049struct xfrm_if_parms {
1050 char name[IFNAMSIZ]; /* name of XFRM device */
1051 int link; /* ifindex of underlying L2 interface */
1052 u32 if_id; /* interface identifyer */
1053};
1054
1055struct xfrm_if {
1056 struct xfrm_if __rcu *next; /* next interface in list */
1057 struct net_device *dev; /* virtual device associated with interface */
1058 struct net_device *phydev; /* physical device */
1059 struct net *net; /* netns for packet i/o */
1060 struct xfrm_if_parms p; /* interface parms */
1061
1062 struct gro_cells gro_cells;
1063};
1064
1065struct xfrm_offload {
1066 /* Output sequence number for replay protection on offloading. */
1067 struct {
1068 __u32 low;
1069 __u32 hi;
1070 } seq;
1071
1072 __u32 flags;
1073#define SA_DELETE_REQ 1
1074#define CRYPTO_DONE 2
1075#define CRYPTO_NEXT_DONE 4
1076#define CRYPTO_FALLBACK 8
1077#define XFRM_GSO_SEGMENT 16
1078#define XFRM_GRO 32
1079#define XFRM_ESP_NO_TRAILER 64
1080#define XFRM_DEV_RESUME 128
1081
1082 __u32 status;
1083#define CRYPTO_SUCCESS 1
1084#define CRYPTO_GENERIC_ERROR 2
1085#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1086#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1087#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1088#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1089#define CRYPTO_INVALID_PACKET_SYNTAX 64
1090#define CRYPTO_INVALID_PROTOCOL 128
1091
1092 __u8 proto;
1093};
1094
1095struct sec_path {
1096 refcount_t refcnt;
1097 int len;
1098 int olen;
1099
1100 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1101 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1102};
1103
1104static inline int secpath_exists(struct sk_buff *skb)
1105{
1106#ifdef CONFIG_XFRM
1107 return skb->sp != NULL;
1108#else
1109 return 0;
1110#endif
1111}
1112
1113static inline struct sec_path *
1114secpath_get(struct sec_path *sp)
1115{
1116 if (sp)
1117 refcount_inc(&sp->refcnt);
1118 return sp;
1119}
1120
1121void __secpath_destroy(struct sec_path *sp);
1122
1123static inline void
1124secpath_put(struct sec_path *sp)
1125{
1126 if (sp && refcount_dec_and_test(&sp->refcnt))
1127 __secpath_destroy(sp);
1128}
1129
1130struct sec_path *secpath_dup(struct sec_path *src);
1131int secpath_set(struct sk_buff *skb);
1132
1133static inline void
1134secpath_reset(struct sk_buff *skb)
1135{
1136#ifdef CONFIG_XFRM
1137 secpath_put(skb->sp);
1138 skb->sp = NULL;
1139#endif
1140}
1141
1142static inline int
1143xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1144{
1145 switch (family) {
1146 case AF_INET:
1147 return addr->a4 == 0;
1148 case AF_INET6:
1149 return ipv6_addr_any(&addr->in6);
1150 }
1151 return 0;
1152}
1153
1154static inline int
1155__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1156{
1157 return (tmpl->saddr.a4 &&
1158 tmpl->saddr.a4 != x->props.saddr.a4);
1159}
1160
1161static inline int
1162__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1163{
1164 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1165 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1166}
1167
1168static inline int
1169xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1170{
1171 switch (family) {
1172 case AF_INET:
1173 return __xfrm4_state_addr_cmp(tmpl, x);
1174 case AF_INET6:
1175 return __xfrm6_state_addr_cmp(tmpl, x);
1176 }
1177 return !0;
1178}
1179
1180#ifdef CONFIG_XFRM
1181int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1182 unsigned short family);
1183
1184static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1185 struct sk_buff *skb,
1186 unsigned int family, int reverse)
1187{
1188 struct net *net = dev_net(skb->dev);
1189 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1190
1191 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1192 return __xfrm_policy_check(sk, ndir, skb, family);
1193
1194 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1195 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1196 __xfrm_policy_check(sk, ndir, skb, family);
1197}
1198
1199static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1200{
1201 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1202}
1203
1204static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1205{
1206 return xfrm_policy_check(sk, dir, skb, AF_INET);
1207}
1208
1209static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1210{
1211 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1212}
1213
1214static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1215 struct sk_buff *skb)
1216{
1217 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1218}
1219
1220static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1221 struct sk_buff *skb)
1222{
1223 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1224}
1225
1226int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1227 unsigned int family, int reverse);
1228
1229static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1230 unsigned int family)
1231{
1232 return __xfrm_decode_session(skb, fl, family, 0);
1233}
1234
1235static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1236 struct flowi *fl,
1237 unsigned int family)
1238{
1239 return __xfrm_decode_session(skb, fl, family, 1);
1240}
1241
1242int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1243
1244static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1245{
1246 struct net *net = dev_net(skb->dev);
1247
1248 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1249 (skb_dst(skb)->flags & DST_NOXFRM) ||
1250 __xfrm_route_forward(skb, family);
1251}
1252
1253static inline int xfrm4_route_forward(struct sk_buff *skb)
1254{
1255 return xfrm_route_forward(skb, AF_INET);
1256}
1257
1258static inline int xfrm6_route_forward(struct sk_buff *skb)
1259{
1260 return xfrm_route_forward(skb, AF_INET6);
1261}
1262
1263int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1264
1265static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1266{
1267 sk->sk_policy[0] = NULL;
1268 sk->sk_policy[1] = NULL;
1269 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1270 return __xfrm_sk_clone_policy(sk, osk);
1271 return 0;
1272}
1273
1274int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1275
1276static inline void xfrm_sk_free_policy(struct sock *sk)
1277{
1278 struct xfrm_policy *pol;
1279
1280 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1281 if (unlikely(pol != NULL)) {
1282 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1283 sk->sk_policy[0] = NULL;
1284 }
1285 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1286 if (unlikely(pol != NULL)) {
1287 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1288 sk->sk_policy[1] = NULL;
1289 }
1290}
1291
1292#else
1293
1294static inline void xfrm_sk_free_policy(struct sock *sk) {}
1295static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1296static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1297static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1298static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1299{
1300 return 1;
1301}
1302static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1303{
1304 return 1;
1305}
1306static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1307{
1308 return 1;
1309}
1310static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1311 struct flowi *fl,
1312 unsigned int family)
1313{
1314 return -ENOSYS;
1315}
1316static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1317 struct sk_buff *skb)
1318{
1319 return 1;
1320}
1321static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1322 struct sk_buff *skb)
1323{
1324 return 1;
1325}
1326#endif
1327
1328static __inline__
1329xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1330{
1331 switch (family){
1332 case AF_INET:
1333 return (xfrm_address_t *)&fl->u.ip4.daddr;
1334 case AF_INET6:
1335 return (xfrm_address_t *)&fl->u.ip6.daddr;
1336 }
1337 return NULL;
1338}
1339
1340static __inline__
1341xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1342{
1343 switch (family){
1344 case AF_INET:
1345 return (xfrm_address_t *)&fl->u.ip4.saddr;
1346 case AF_INET6:
1347 return (xfrm_address_t *)&fl->u.ip6.saddr;
1348 }
1349 return NULL;
1350}
1351
1352static __inline__
1353void xfrm_flowi_addr_get(const struct flowi *fl,
1354 xfrm_address_t *saddr, xfrm_address_t *daddr,
1355 unsigned short family)
1356{
1357 switch(family) {
1358 case AF_INET:
1359 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1360 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1361 break;
1362 case AF_INET6:
1363 saddr->in6 = fl->u.ip6.saddr;
1364 daddr->in6 = fl->u.ip6.daddr;
1365 break;
1366 }
1367}
1368
1369static __inline__ int
1370__xfrm4_state_addr_check(const struct xfrm_state *x,
1371 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1372{
1373 if (daddr->a4 == x->id.daddr.a4 &&
1374 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1375 return 1;
1376 return 0;
1377}
1378
1379static __inline__ int
1380__xfrm6_state_addr_check(const struct xfrm_state *x,
1381 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1382{
1383 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1384 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1385 ipv6_addr_any((struct in6_addr *)saddr) ||
1386 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1387 return 1;
1388 return 0;
1389}
1390
1391static __inline__ int
1392xfrm_state_addr_check(const struct xfrm_state *x,
1393 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1394 unsigned short family)
1395{
1396 switch (family) {
1397 case AF_INET:
1398 return __xfrm4_state_addr_check(x, daddr, saddr);
1399 case AF_INET6:
1400 return __xfrm6_state_addr_check(x, daddr, saddr);
1401 }
1402 return 0;
1403}
1404
1405static __inline__ int
1406xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1407 unsigned short family)
1408{
1409 switch (family) {
1410 case AF_INET:
1411 return __xfrm4_state_addr_check(x,
1412 (const xfrm_address_t *)&fl->u.ip4.daddr,
1413 (const xfrm_address_t *)&fl->u.ip4.saddr);
1414 case AF_INET6:
1415 return __xfrm6_state_addr_check(x,
1416 (const xfrm_address_t *)&fl->u.ip6.daddr,
1417 (const xfrm_address_t *)&fl->u.ip6.saddr);
1418 }
1419 return 0;
1420}
1421
1422static inline int xfrm_state_kern(const struct xfrm_state *x)
1423{
1424 return atomic_read(&x->tunnel_users);
1425}
1426
1427static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1428{
1429 return (!userproto || proto == userproto ||
1430 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1431 proto == IPPROTO_ESP ||
1432 proto == IPPROTO_COMP)));
1433}
1434
1435/*
1436 * xfrm algorithm information
1437 */
1438struct xfrm_algo_aead_info {
1439 char *geniv;
1440 u16 icv_truncbits;
1441};
1442
1443struct xfrm_algo_auth_info {
1444 u16 icv_truncbits;
1445 u16 icv_fullbits;
1446};
1447
1448struct xfrm_algo_encr_info {
1449 char *geniv;
1450 u16 blockbits;
1451 u16 defkeybits;
1452};
1453
1454struct xfrm_algo_comp_info {
1455 u16 threshold;
1456};
1457
1458struct xfrm_algo_desc {
1459 char *name;
1460 char *compat;
1461 u8 available:1;
1462 u8 pfkey_supported:1;
1463 union {
1464 struct xfrm_algo_aead_info aead;
1465 struct xfrm_algo_auth_info auth;
1466 struct xfrm_algo_encr_info encr;
1467 struct xfrm_algo_comp_info comp;
1468 } uinfo;
1469 struct sadb_alg desc;
1470};
1471
1472/* XFRM protocol handlers. */
1473struct xfrm4_protocol {
1474 int (*handler)(struct sk_buff *skb);
1475 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1476 int encap_type);
1477 int (*cb_handler)(struct sk_buff *skb, int err);
1478 int (*err_handler)(struct sk_buff *skb, u32 info);
1479
1480 struct xfrm4_protocol __rcu *next;
1481 int priority;
1482};
1483
1484struct xfrm6_protocol {
1485 int (*handler)(struct sk_buff *skb);
1486 int (*cb_handler)(struct sk_buff *skb, int err);
1487 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1488 u8 type, u8 code, int offset, __be32 info);
1489
1490 struct xfrm6_protocol __rcu *next;
1491 int priority;
1492};
1493
1494/* XFRM tunnel handlers. */
1495struct xfrm_tunnel {
1496 int (*handler)(struct sk_buff *skb);
1497 int (*err_handler)(struct sk_buff *skb, u32 info);
1498
1499 struct xfrm_tunnel __rcu *next;
1500 int priority;
1501};
1502
1503struct xfrm6_tunnel {
1504 int (*handler)(struct sk_buff *skb);
1505 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1506 u8 type, u8 code, int offset, __be32 info);
1507 struct xfrm6_tunnel __rcu *next;
1508 int priority;
1509};
1510
1511void xfrm_init(void);
1512void xfrm4_init(void);
1513int xfrm_state_init(struct net *net);
1514void xfrm_state_fini(struct net *net);
1515void xfrm4_state_init(void);
1516void xfrm4_protocol_init(void);
1517#ifdef CONFIG_XFRM
1518int xfrm6_init(void);
1519void xfrm6_fini(void);
1520int xfrm6_state_init(void);
1521void xfrm6_state_fini(void);
1522int xfrm6_protocol_init(void);
1523void xfrm6_protocol_fini(void);
1524#else
1525static inline int xfrm6_init(void)
1526{
1527 return 0;
1528}
1529static inline void xfrm6_fini(void)
1530{
1531 ;
1532}
1533#endif
1534
1535#ifdef CONFIG_XFRM_STATISTICS
1536int xfrm_proc_init(struct net *net);
1537void xfrm_proc_fini(struct net *net);
1538#endif
1539
1540int xfrm_sysctl_init(struct net *net);
1541#ifdef CONFIG_SYSCTL
1542void xfrm_sysctl_fini(struct net *net);
1543#else
1544static inline void xfrm_sysctl_fini(struct net *net)
1545{
1546}
1547#endif
1548
1549void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1550 struct xfrm_address_filter *filter);
1551int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1552 int (*func)(struct xfrm_state *, int, void*), void *);
1553void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1554struct xfrm_state *xfrm_state_alloc(struct net *net);
1555struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1556 const xfrm_address_t *saddr,
1557 const struct flowi *fl,
1558 struct xfrm_tmpl *tmpl,
1559 struct xfrm_policy *pol, int *err,
1560 unsigned short family, u32 if_id);
1561struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1562 xfrm_address_t *daddr,
1563 xfrm_address_t *saddr,
1564 unsigned short family,
1565 u8 mode, u8 proto, u32 reqid);
1566struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1567 unsigned short family);
1568int xfrm_state_check_expire(struct xfrm_state *x);
1569void xfrm_state_insert(struct xfrm_state *x);
1570int xfrm_state_add(struct xfrm_state *x);
1571int xfrm_state_update(struct xfrm_state *x);
1572struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1573 const xfrm_address_t *daddr, __be32 spi,
1574 u8 proto, unsigned short family);
1575struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1576 const xfrm_address_t *daddr,
1577 const xfrm_address_t *saddr,
1578 u8 proto,
1579 unsigned short family);
1580#ifdef CONFIG_XFRM_SUB_POLICY
1581int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1582 unsigned short family, struct net *net);
1583int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1584 unsigned short family);
1585#else
1586static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1587 int n, unsigned short family, struct net *net)
1588{
1589 return -ENOSYS;
1590}
1591
1592static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1593 int n, unsigned short family)
1594{
1595 return -ENOSYS;
1596}
1597#endif
1598
1599struct xfrmk_sadinfo {
1600 u32 sadhcnt; /* current hash bkts */
1601 u32 sadhmcnt; /* max allowed hash bkts */
1602 u32 sadcnt; /* current running count */
1603};
1604
1605struct xfrmk_spdinfo {
1606 u32 incnt;
1607 u32 outcnt;
1608 u32 fwdcnt;
1609 u32 inscnt;
1610 u32 outscnt;
1611 u32 fwdscnt;
1612 u32 spdhcnt;
1613 u32 spdhmcnt;
1614};
1615
1616struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1617int xfrm_state_delete(struct xfrm_state *x);
1618int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1619int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1620void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1621void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1622u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1623int xfrm_init_replay(struct xfrm_state *x);
1624int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1625int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1626int xfrm_init_state(struct xfrm_state *x);
1627int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1628int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1629int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1630int xfrm_trans_queue(struct sk_buff *skb,
1631 int (*finish)(struct net *, struct sock *,
1632 struct sk_buff *));
1633int xfrm_output_resume(struct sk_buff *skb, int err);
1634int xfrm_output(struct sock *sk, struct sk_buff *skb);
1635int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1636void xfrm_local_error(struct sk_buff *skb, int mtu);
1637int xfrm4_extract_header(struct sk_buff *skb);
1638int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1639int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1640 int encap_type);
1641int xfrm4_transport_finish(struct sk_buff *skb, int async);
1642int xfrm4_rcv(struct sk_buff *skb);
1643int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1644
1645static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1646{
1647 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1648 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1649 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1650 return xfrm_input(skb, nexthdr, spi, 0);
1651}
1652
1653int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1654int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1655int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1656int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1657int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1658int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1659int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1660int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1661int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1662void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1663int xfrm6_extract_header(struct sk_buff *skb);
1664int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1665int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1666 struct ip6_tnl *t);
1667int xfrm6_transport_finish(struct sk_buff *skb, int async);
1668int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1669int xfrm6_rcv(struct sk_buff *skb);
1670int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1671 xfrm_address_t *saddr, u8 proto);
1672void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1673int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1674int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1675int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1676int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1677int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1678__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1679__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1680int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1681int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1682int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1683int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1684int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1685 u8 **prevhdr);
1686
1687#ifdef CONFIG_XFRM
1688int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1689int xfrm_user_policy(struct sock *sk, int optname,
1690 u8 __user *optval, int optlen);
1691#else
1692static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1693{
1694 return -ENOPROTOOPT;
1695}
1696
1697static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1698{
1699 /* should not happen */
1700 kfree_skb(skb);
1701 return 0;
1702}
1703#endif
1704
1705struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1706 const xfrm_address_t *saddr,
1707 const xfrm_address_t *daddr,
1708 int family, u32 mark);
1709
1710struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1711
1712void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1713int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1714 int (*func)(struct xfrm_policy *, int, int, void*),
1715 void *);
1716void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1717int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1718struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1719 u8 type, int dir,
1720 struct xfrm_selector *sel,
1721 struct xfrm_sec_ctx *ctx, int delete,
1722 int *err);
1723struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1724 int dir, u32 id, int delete, int *err);
1725int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1726void xfrm_policy_hash_rebuild(struct net *net);
1727u32 xfrm_get_acqseq(void);
1728int verify_spi_info(u8 proto, u32 min, u32 max);
1729int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1730struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1731 u8 mode, u32 reqid, u32 if_id, u8 proto,
1732 const xfrm_address_t *daddr,
1733 const xfrm_address_t *saddr, int create,
1734 unsigned short family);
1735int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1736
1737#ifdef CONFIG_XFRM_MIGRATE
1738int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1739 const struct xfrm_migrate *m, int num_bundles,
1740 const struct xfrm_kmaddress *k,
1741 const struct xfrm_encap_tmpl *encap);
1742struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1743struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1744 struct xfrm_migrate *m,
1745 struct xfrm_encap_tmpl *encap);
1746int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1747 struct xfrm_migrate *m, int num_bundles,
1748 struct xfrm_kmaddress *k, struct net *net,
1749 struct xfrm_encap_tmpl *encap);
1750#endif
1751
1752int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1753void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1754int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1755 xfrm_address_t *addr);
1756
1757void xfrm_input_init(void);
1758int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1759
1760void xfrm_probe_algs(void);
1761int xfrm_count_pfkey_auth_supported(void);
1762int xfrm_count_pfkey_enc_supported(void);
1763struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1764struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1765struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1766struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1767struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1768struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1769struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1770struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1771struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1772 int probe);
1773
1774static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1775 const xfrm_address_t *b)
1776{
1777 return ipv6_addr_equal((const struct in6_addr *)a,
1778 (const struct in6_addr *)b);
1779}
1780
1781static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1782 const xfrm_address_t *b,
1783 sa_family_t family)
1784{
1785 switch (family) {
1786 default:
1787 case AF_INET:
1788 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1789 case AF_INET6:
1790 return xfrm6_addr_equal(a, b);
1791 }
1792}
1793
1794static inline int xfrm_policy_id2dir(u32 index)
1795{
1796 return index & 7;
1797}
1798
1799#ifdef CONFIG_XFRM
1800static inline int xfrm_aevent_is_on(struct net *net)
1801{
1802 struct sock *nlsk;
1803 int ret = 0;
1804
1805 rcu_read_lock();
1806 nlsk = rcu_dereference(net->xfrm.nlsk);
1807 if (nlsk)
1808 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1809 rcu_read_unlock();
1810 return ret;
1811}
1812
1813static inline int xfrm_acquire_is_on(struct net *net)
1814{
1815 struct sock *nlsk;
1816 int ret = 0;
1817
1818 rcu_read_lock();
1819 nlsk = rcu_dereference(net->xfrm.nlsk);
1820 if (nlsk)
1821 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1822 rcu_read_unlock();
1823
1824 return ret;
1825}
1826#endif
1827
1828static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1829{
1830 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1831}
1832
1833static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1834{
1835 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1836}
1837
1838static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1839{
1840 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1841}
1842
1843static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1844{
1845 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1846}
1847
1848#ifdef CONFIG_XFRM_MIGRATE
1849static inline int xfrm_replay_clone(struct xfrm_state *x,
1850 struct xfrm_state *orig)
1851{
1852 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1853 GFP_KERNEL);
1854 if (!x->replay_esn)
1855 return -ENOMEM;
1856
1857 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1858 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1859
1860 x->preplay_esn = kmemdup(x->replay_esn,
1861 xfrm_replay_state_esn_len(x->replay_esn),
1862 GFP_KERNEL);
1863 if (!x->preplay_esn) {
1864 kfree(x->replay_esn);
1865 return -ENOMEM;
1866 }
1867
1868 return 0;
1869}
1870
1871static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1872{
1873 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1874}
1875
1876
1877static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1878{
1879 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1880}
1881
1882static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1883{
1884 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1885}
1886
1887static inline void xfrm_states_put(struct xfrm_state **states, int n)
1888{
1889 int i;
1890 for (i = 0; i < n; i++)
1891 xfrm_state_put(*(states + i));
1892}
1893
1894static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1895{
1896 int i;
1897 for (i = 0; i < n; i++)
1898 xfrm_state_delete(*(states + i));
1899}
1900#endif
1901
1902#ifdef CONFIG_XFRM
1903static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1904{
1905 return skb->sp->xvec[skb->sp->len - 1];
1906}
1907#endif
1908
1909static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1910{
1911#ifdef CONFIG_XFRM
1912 struct sec_path *sp = skb->sp;
1913
1914 if (!sp || !sp->olen || sp->len != sp->olen)
1915 return NULL;
1916
1917 return &sp->ovec[sp->olen - 1];
1918#else
1919 return NULL;
1920#endif
1921}
1922
1923void __init xfrm_dev_init(void);
1924
1925#ifdef CONFIG_XFRM_OFFLOAD
1926void xfrm_dev_resume(struct sk_buff *skb);
1927void xfrm_dev_backlog(struct softnet_data *sd);
1928struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1929int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1930 struct xfrm_user_offload *xuo);
1931bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1932
1933static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1934{
1935 struct xfrm_state_offload *xso = &x->xso;
1936
1937 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1938 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1939}
1940
1941static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1942{
1943 struct xfrm_state *x = dst->xfrm;
1944 struct xfrm_dst *xdst;
1945
1946 if (!x || !x->type_offload)
1947 return false;
1948
1949 xdst = (struct xfrm_dst *) dst;
1950 if (!x->xso.offload_handle && !xdst->child->xfrm)
1951 return true;
1952 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1953 !xdst->child->xfrm)
1954 return true;
1955
1956 return false;
1957}
1958
1959static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1960{
1961 struct xfrm_state_offload *xso = &x->xso;
1962
1963 if (xso->dev)
1964 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1965}
1966
1967static inline void xfrm_dev_state_free(struct xfrm_state *x)
1968{
1969 struct xfrm_state_offload *xso = &x->xso;
1970 struct net_device *dev = xso->dev;
1971
1972 if (dev && dev->xfrmdev_ops) {
1973 if (dev->xfrmdev_ops->xdo_dev_state_free)
1974 dev->xfrmdev_ops->xdo_dev_state_free(x);
1975 xso->dev = NULL;
1976 dev_put(dev);
1977 }
1978}
1979#else
1980static inline void xfrm_dev_resume(struct sk_buff *skb)
1981{
1982}
1983
1984static inline void xfrm_dev_backlog(struct softnet_data *sd)
1985{
1986}
1987
1988static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1989{
1990 return skb;
1991}
1992
1993static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1994{
1995 return 0;
1996}
1997
1998static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1999{
2000}
2001
2002static inline void xfrm_dev_state_free(struct xfrm_state *x)
2003{
2004}
2005
2006static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2007{
2008 return false;
2009}
2010
2011static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2012{
2013}
2014
2015static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2016{
2017 return false;
2018}
2019#endif
2020
2021static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2022{
2023 if (attrs[XFRMA_MARK])
2024 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2025 else
2026 m->v = m->m = 0;
2027
2028 return m->v & m->m;
2029}
2030
2031static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2032{
2033 int ret = 0;
2034
2035 if (m->m | m->v)
2036 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2037 return ret;
2038}
2039
2040static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2041{
2042 struct xfrm_mark *m = &x->props.smark;
2043
2044 return (m->v & m->m) | (mark & ~m->m);
2045}
2046
2047static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2048{
2049 int ret = 0;
2050
2051 if (if_id)
2052 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2053 return ret;
2054}
2055
2056static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2057 unsigned int family)
2058{
2059 bool tunnel = false;
2060
2061 switch(family) {
2062 case AF_INET:
2063 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2064 tunnel = true;
2065 break;
2066 case AF_INET6:
2067 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2068 tunnel = true;
2069 break;
2070 }
2071 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2072 return -EINVAL;
2073
2074 return 0;
2075}
2076#endif /* _NET_XFRM_H */
2077