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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_XFRM_H
3#define _NET_XFRM_H
4
5#include <linux/compiler.h>
6#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/pfkeyv2.h>
12#include <linux/ipsec.h>
13#include <linux/in6.h>
14#include <linux/mutex.h>
15#include <linux/audit.h>
16#include <linux/slab.h>
17#include <linux/refcount.h>
18
19#include <net/sock.h>
20#include <net/dst.h>
21#include <net/ip.h>
22#include <net/route.h>
23#include <net/ipv6.h>
24#include <net/ip6_fib.h>
25#include <net/flow.h>
26
27#include <linux/interrupt.h>
28
29#ifdef CONFIG_XFRM_STATISTICS
30#include <net/snmp.h>
31#endif
32
33#define XFRM_PROTO_ESP 50
34#define XFRM_PROTO_AH 51
35#define XFRM_PROTO_COMP 108
36#define XFRM_PROTO_IPIP 4
37#define XFRM_PROTO_IPV6 41
38#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
39#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
40
41#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
42#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
43#define MODULE_ALIAS_XFRM_MODE(family, encap) \
44 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
45#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
46 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
47#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
49
50#ifdef CONFIG_XFRM_STATISTICS
51#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
52#else
53#define XFRM_INC_STATS(net, field) ((void)(net))
54#endif
55
56
57/* Organization of SPD aka "XFRM rules"
58 ------------------------------------
59
60 Basic objects:
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
65
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
70
71 Lookup is plain linear search until the first match with selector.
72
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
79
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
83 |---. child .-> NULL
84
85 Bundles are cached at xrfm_policy struct (field ->bundles).
86
87
88 Resolution of xrfm_tmpl
89 -----------------------
90 Template contains:
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
101 flow id?
102
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
106
107 PROBLEMS:
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116 */
117
118struct xfrm_state_walk {
119 struct list_head all;
120 u8 state;
121 u8 dying;
122 u8 proto;
123 u32 seq;
124 struct xfrm_address_filter *filter;
125};
126
127struct xfrm_state_offload {
128 struct net_device *dev;
129 unsigned long offload_handle;
130 unsigned int num_exthdrs;
131 u8 flags;
132};
133
134/* Full description of state of transformer. */
135struct xfrm_state {
136 possible_net_t xs_net;
137 union {
138 struct hlist_node gclist;
139 struct hlist_node bydst;
140 };
141 struct hlist_node bysrc;
142 struct hlist_node byspi;
143
144 refcount_t refcnt;
145 spinlock_t lock;
146
147 struct xfrm_id id;
148 struct xfrm_selector sel;
149 struct xfrm_mark mark;
150 u32 tfcpad;
151
152 u32 genid;
153
154 /* Key manager bits */
155 struct xfrm_state_walk km;
156
157 /* Parameters of this state. */
158 struct {
159 u32 reqid;
160 u8 mode;
161 u8 replay_window;
162 u8 aalgo, ealgo, calgo;
163 u8 flags;
164 u16 family;
165 xfrm_address_t saddr;
166 int header_len;
167 int trailer_len;
168 u32 extra_flags;
169 u32 output_mark;
170 } props;
171
172 struct xfrm_lifetime_cfg lft;
173
174 /* Data for transformer */
175 struct xfrm_algo_auth *aalg;
176 struct xfrm_algo *ealg;
177 struct xfrm_algo *calg;
178 struct xfrm_algo_aead *aead;
179 const char *geniv;
180
181 /* Data for encapsulator */
182 struct xfrm_encap_tmpl *encap;
183
184 /* Data for care-of address */
185 xfrm_address_t *coaddr;
186
187 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
188 struct xfrm_state *tunnel;
189
190 /* If a tunnel, number of users + 1 */
191 atomic_t tunnel_users;
192
193 /* State for replay detection */
194 struct xfrm_replay_state replay;
195 struct xfrm_replay_state_esn *replay_esn;
196
197 /* Replay detection state at the time we sent the last notification */
198 struct xfrm_replay_state preplay;
199 struct xfrm_replay_state_esn *preplay_esn;
200
201 /* The functions for replay detection. */
202 const struct xfrm_replay *repl;
203
204 /* internal flag that only holds state for delayed aevent at the
205 * moment
206 */
207 u32 xflags;
208
209 /* Replay detection notification settings */
210 u32 replay_maxage;
211 u32 replay_maxdiff;
212
213 /* Replay detection notification timer */
214 struct timer_list rtimer;
215
216 /* Statistics */
217 struct xfrm_stats stats;
218
219 struct xfrm_lifetime_cur curlft;
220 struct tasklet_hrtimer mtimer;
221
222 struct xfrm_state_offload xso;
223
224 /* used to fix curlft->add_time when changing date */
225 long saved_tmo;
226
227 /* Last used time */
228 unsigned long lastused;
229
230 struct page_frag xfrag;
231
232 /* Reference to data common to all the instances of this
233 * transformer. */
234 const struct xfrm_type *type;
235 struct xfrm_mode *inner_mode;
236 struct xfrm_mode *inner_mode_iaf;
237 struct xfrm_mode *outer_mode;
238
239 const struct xfrm_type_offload *type_offload;
240
241 /* Security context */
242 struct xfrm_sec_ctx *security;
243
244 /* Private data of this transformer, format is opaque,
245 * interpreted by xfrm_type methods. */
246 void *data;
247};
248
249static inline struct net *xs_net(struct xfrm_state *x)
250{
251 return read_pnet(&x->xs_net);
252}
253
254/* xflags - make enum if more show up */
255#define XFRM_TIME_DEFER 1
256#define XFRM_SOFT_EXPIRE 2
257
258enum {
259 XFRM_STATE_VOID,
260 XFRM_STATE_ACQ,
261 XFRM_STATE_VALID,
262 XFRM_STATE_ERROR,
263 XFRM_STATE_EXPIRED,
264 XFRM_STATE_DEAD
265};
266
267/* callback structure passed from either netlink or pfkey */
268struct km_event {
269 union {
270 u32 hard;
271 u32 proto;
272 u32 byid;
273 u32 aevent;
274 u32 type;
275 } data;
276
277 u32 seq;
278 u32 portid;
279 u32 event;
280 struct net *net;
281};
282
283struct xfrm_replay {
284 void (*advance)(struct xfrm_state *x, __be32 net_seq);
285 int (*check)(struct xfrm_state *x,
286 struct sk_buff *skb,
287 __be32 net_seq);
288 int (*recheck)(struct xfrm_state *x,
289 struct sk_buff *skb,
290 __be32 net_seq);
291 void (*notify)(struct xfrm_state *x, int event);
292 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
293};
294
295struct net_device;
296struct xfrm_type;
297struct xfrm_dst;
298struct xfrm_policy_afinfo {
299 struct dst_ops *dst_ops;
300 struct dst_entry *(*dst_lookup)(struct net *net,
301 int tos, int oif,
302 const xfrm_address_t *saddr,
303 const xfrm_address_t *daddr,
304 u32 mark);
305 int (*get_saddr)(struct net *net, int oif,
306 xfrm_address_t *saddr,
307 xfrm_address_t *daddr,
308 u32 mark);
309 void (*decode_session)(struct sk_buff *skb,
310 struct flowi *fl,
311 int reverse);
312 int (*get_tos)(const struct flowi *fl);
313 int (*init_path)(struct xfrm_dst *path,
314 struct dst_entry *dst,
315 int nfheader_len);
316 int (*fill_dst)(struct xfrm_dst *xdst,
317 struct net_device *dev,
318 const struct flowi *fl);
319 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
320};
321
322int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
323void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
324void km_policy_notify(struct xfrm_policy *xp, int dir,
325 const struct km_event *c);
326void xfrm_policy_cache_flush(void);
327void km_state_notify(struct xfrm_state *x, const struct km_event *c);
328
329struct xfrm_tmpl;
330int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
331 struct xfrm_policy *pol);
332void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
333int __xfrm_state_delete(struct xfrm_state *x);
334
335struct xfrm_state_afinfo {
336 unsigned int family;
337 unsigned int proto;
338 __be16 eth_proto;
339 struct module *owner;
340 const struct xfrm_type *type_map[IPPROTO_MAX];
341 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX];
342 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
343
344 int (*init_flags)(struct xfrm_state *x);
345 void (*init_tempsel)(struct xfrm_selector *sel,
346 const struct flowi *fl);
347 void (*init_temprop)(struct xfrm_state *x,
348 const struct xfrm_tmpl *tmpl,
349 const xfrm_address_t *daddr,
350 const xfrm_address_t *saddr);
351 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
352 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
353 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
354 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
355 int (*extract_input)(struct xfrm_state *x,
356 struct sk_buff *skb);
357 int (*extract_output)(struct xfrm_state *x,
358 struct sk_buff *skb);
359 int (*transport_finish)(struct sk_buff *skb,
360 int async);
361 void (*local_error)(struct sk_buff *skb, u32 mtu);
362};
363
364int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
365int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
366struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
367struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
368
369struct xfrm_input_afinfo {
370 unsigned int family;
371 int (*callback)(struct sk_buff *skb, u8 protocol,
372 int err);
373};
374
375int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
376int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
377
378void xfrm_flush_gc(void);
379void xfrm_state_delete_tunnel(struct xfrm_state *x);
380
381struct xfrm_type {
382 char *description;
383 struct module *owner;
384 u8 proto;
385 u8 flags;
386#define XFRM_TYPE_NON_FRAGMENT 1
387#define XFRM_TYPE_REPLAY_PROT 2
388#define XFRM_TYPE_LOCAL_COADDR 4
389#define XFRM_TYPE_REMOTE_COADDR 8
390
391 int (*init_state)(struct xfrm_state *x);
392 void (*destructor)(struct xfrm_state *);
393 int (*input)(struct xfrm_state *, struct sk_buff *skb);
394 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
395 int (*reject)(struct xfrm_state *, struct sk_buff *,
396 const struct flowi *);
397 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
398 /* Estimate maximal size of result of transformation of a dgram */
399 u32 (*get_mtu)(struct xfrm_state *, int size);
400};
401
402int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
403int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
404
405struct xfrm_type_offload {
406 char *description;
407 struct module *owner;
408 u8 proto;
409 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
410 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
411 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
412};
413
414int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
415int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
416
417struct xfrm_mode {
418 /*
419 * Remove encapsulation header.
420 *
421 * The IP header will be moved over the top of the encapsulation
422 * header.
423 *
424 * On entry, the transport header shall point to where the IP header
425 * should be and the network header shall be set to where the IP
426 * header currently is. skb->data shall point to the start of the
427 * payload.
428 */
429 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
430
431 /*
432 * This is the actual input entry point.
433 *
434 * For transport mode and equivalent this would be identical to
435 * input2 (which does not need to be set). While tunnel mode
436 * and equivalent would set this to the tunnel encapsulation function
437 * xfrm4_prepare_input that would in turn call input2.
438 */
439 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
440
441 /*
442 * Add encapsulation header.
443 *
444 * On exit, the transport header will be set to the start of the
445 * encapsulation header to be filled in by x->type->output and
446 * the mac header will be set to the nextheader (protocol for
447 * IPv4) field of the extension header directly preceding the
448 * encapsulation header, or in its absence, that of the top IP
449 * header. The value of the network header will always point
450 * to the top IP header while skb->data will point to the payload.
451 */
452 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
453
454 /*
455 * This is the actual output entry point.
456 *
457 * For transport mode and equivalent this would be identical to
458 * output2 (which does not need to be set). While tunnel mode
459 * and equivalent would set this to a tunnel encapsulation function
460 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
461 * call output2.
462 */
463 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
464
465 /*
466 * Adjust pointers into the packet and do GSO segmentation.
467 */
468 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
469
470 /*
471 * Adjust pointers into the packet when IPsec is done at layer2.
472 */
473 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
474
475 struct xfrm_state_afinfo *afinfo;
476 struct module *owner;
477 unsigned int encap;
478 int flags;
479};
480
481/* Flags for xfrm_mode. */
482enum {
483 XFRM_MODE_FLAG_TUNNEL = 1,
484};
485
486int xfrm_register_mode(struct xfrm_mode *mode, int family);
487int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
488
489static inline int xfrm_af2proto(unsigned int family)
490{
491 switch(family) {
492 case AF_INET:
493 return IPPROTO_IPIP;
494 case AF_INET6:
495 return IPPROTO_IPV6;
496 default:
497 return 0;
498 }
499}
500
501static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
502{
503 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
504 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
505 return x->inner_mode;
506 else
507 return x->inner_mode_iaf;
508}
509
510struct xfrm_tmpl {
511/* id in template is interpreted as:
512 * daddr - destination of tunnel, may be zero for transport mode.
513 * spi - zero to acquire spi. Not zero if spi is static, then
514 * daddr must be fixed too.
515 * proto - AH/ESP/IPCOMP
516 */
517 struct xfrm_id id;
518
519/* Source address of tunnel. Ignored, if it is not a tunnel. */
520 xfrm_address_t saddr;
521
522 unsigned short encap_family;
523
524 u32 reqid;
525
526/* Mode: transport, tunnel etc. */
527 u8 mode;
528
529/* Sharing mode: unique, this session only, this user only etc. */
530 u8 share;
531
532/* May skip this transfomration if no SA is found */
533 u8 optional;
534
535/* Skip aalgos/ealgos/calgos checks. */
536 u8 allalgs;
537
538/* Bit mask of algos allowed for acquisition */
539 u32 aalgos;
540 u32 ealgos;
541 u32 calgos;
542};
543
544#define XFRM_MAX_DEPTH 6
545#define XFRM_MAX_OFFLOAD_DEPTH 1
546
547struct xfrm_policy_walk_entry {
548 struct list_head all;
549 u8 dead;
550};
551
552struct xfrm_policy_walk {
553 struct xfrm_policy_walk_entry walk;
554 u8 type;
555 u32 seq;
556};
557
558struct xfrm_policy_queue {
559 struct sk_buff_head hold_queue;
560 struct timer_list hold_timer;
561 unsigned long timeout;
562};
563
564struct xfrm_policy {
565 possible_net_t xp_net;
566 struct hlist_node bydst;
567 struct hlist_node byidx;
568
569 /* This lock only affects elements except for entry. */
570 rwlock_t lock;
571 refcount_t refcnt;
572 struct timer_list timer;
573
574 atomic_t genid;
575 u32 priority;
576 u32 index;
577 struct xfrm_mark mark;
578 struct xfrm_selector selector;
579 struct xfrm_lifetime_cfg lft;
580 struct xfrm_lifetime_cur curlft;
581 struct xfrm_policy_walk_entry walk;
582 struct xfrm_policy_queue polq;
583 u8 type;
584 u8 action;
585 u8 flags;
586 u8 xfrm_nr;
587 u16 family;
588 struct xfrm_sec_ctx *security;
589 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
590 struct rcu_head rcu;
591};
592
593static inline struct net *xp_net(const struct xfrm_policy *xp)
594{
595 return read_pnet(&xp->xp_net);
596}
597
598struct xfrm_kmaddress {
599 xfrm_address_t local;
600 xfrm_address_t remote;
601 u32 reserved;
602 u16 family;
603};
604
605struct xfrm_migrate {
606 xfrm_address_t old_daddr;
607 xfrm_address_t old_saddr;
608 xfrm_address_t new_daddr;
609 xfrm_address_t new_saddr;
610 u8 proto;
611 u8 mode;
612 u16 reserved;
613 u32 reqid;
614 u16 old_family;
615 u16 new_family;
616};
617
618#define XFRM_KM_TIMEOUT 30
619/* what happened */
620#define XFRM_REPLAY_UPDATE XFRM_AE_CR
621#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
622
623/* default aevent timeout in units of 100ms */
624#define XFRM_AE_ETIME 10
625/* Async Event timer multiplier */
626#define XFRM_AE_ETH_M 10
627/* default seq threshold size */
628#define XFRM_AE_SEQT_SIZE 2
629
630struct xfrm_mgr {
631 struct list_head list;
632 int (*notify)(struct xfrm_state *x, const struct km_event *c);
633 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
634 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
635 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
636 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
637 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
638 int (*migrate)(const struct xfrm_selector *sel,
639 u8 dir, u8 type,
640 const struct xfrm_migrate *m,
641 int num_bundles,
642 const struct xfrm_kmaddress *k,
643 const struct xfrm_encap_tmpl *encap);
644 bool (*is_alive)(const struct km_event *c);
645};
646
647int xfrm_register_km(struct xfrm_mgr *km);
648int xfrm_unregister_km(struct xfrm_mgr *km);
649
650struct xfrm_tunnel_skb_cb {
651 union {
652 struct inet_skb_parm h4;
653 struct inet6_skb_parm h6;
654 } header;
655
656 union {
657 struct ip_tunnel *ip4;
658 struct ip6_tnl *ip6;
659 } tunnel;
660};
661
662#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
663
664/*
665 * This structure is used for the duration where packets are being
666 * transformed by IPsec. As soon as the packet leaves IPsec the
667 * area beyond the generic IP part may be overwritten.
668 */
669struct xfrm_skb_cb {
670 struct xfrm_tunnel_skb_cb header;
671
672 /* Sequence number for replay protection. */
673 union {
674 struct {
675 __u32 low;
676 __u32 hi;
677 } output;
678 struct {
679 __be32 low;
680 __be32 hi;
681 } input;
682 } seq;
683};
684
685#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
686
687/*
688 * This structure is used by the afinfo prepare_input/prepare_output functions
689 * to transmit header information to the mode input/output functions.
690 */
691struct xfrm_mode_skb_cb {
692 struct xfrm_tunnel_skb_cb header;
693
694 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
695 __be16 id;
696 __be16 frag_off;
697
698 /* IP header length (excluding options or extension headers). */
699 u8 ihl;
700
701 /* TOS for IPv4, class for IPv6. */
702 u8 tos;
703
704 /* TTL for IPv4, hop limitfor IPv6. */
705 u8 ttl;
706
707 /* Protocol for IPv4, NH for IPv6. */
708 u8 protocol;
709
710 /* Option length for IPv4, zero for IPv6. */
711 u8 optlen;
712
713 /* Used by IPv6 only, zero for IPv4. */
714 u8 flow_lbl[3];
715};
716
717#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
718
719/*
720 * This structure is used by the input processing to locate the SPI and
721 * related information.
722 */
723struct xfrm_spi_skb_cb {
724 struct xfrm_tunnel_skb_cb header;
725
726 unsigned int daddroff;
727 unsigned int family;
728 __be32 seq;
729};
730
731#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
732
733#ifdef CONFIG_AUDITSYSCALL
734static inline struct audit_buffer *xfrm_audit_start(const char *op)
735{
736 struct audit_buffer *audit_buf = NULL;
737
738 if (audit_enabled == 0)
739 return NULL;
740 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
741 AUDIT_MAC_IPSEC_EVENT);
742 if (audit_buf == NULL)
743 return NULL;
744 audit_log_format(audit_buf, "op=%s", op);
745 return audit_buf;
746}
747
748static inline void xfrm_audit_helper_usrinfo(bool task_valid,
749 struct audit_buffer *audit_buf)
750{
751 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
752 audit_get_loginuid(current) :
753 INVALID_UID);
754 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
755 (unsigned int) -1;
756
757 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
758 audit_log_task_context(audit_buf);
759}
760
761void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
762void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
763 bool task_valid);
764void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
765void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
766void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
767 struct sk_buff *skb);
768void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
769 __be32 net_seq);
770void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
771void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
772 __be32 net_seq);
773void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
774 u8 proto);
775#else
776
777static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
778 bool task_valid)
779{
780}
781
782static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
783 bool task_valid)
784{
785}
786
787static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
788 bool task_valid)
789{
790}
791
792static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
793 bool task_valid)
794{
795}
796
797static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
798 struct sk_buff *skb)
799{
800}
801
802static inline void xfrm_audit_state_replay(struct xfrm_state *x,
803 struct sk_buff *skb, __be32 net_seq)
804{
805}
806
807static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
808 u16 family)
809{
810}
811
812static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
813 __be32 net_spi, __be32 net_seq)
814{
815}
816
817static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
818 struct sk_buff *skb, u8 proto)
819{
820}
821#endif /* CONFIG_AUDITSYSCALL */
822
823static inline void xfrm_pol_hold(struct xfrm_policy *policy)
824{
825 if (likely(policy != NULL))
826 refcount_inc(&policy->refcnt);
827}
828
829void xfrm_policy_destroy(struct xfrm_policy *policy);
830
831static inline void xfrm_pol_put(struct xfrm_policy *policy)
832{
833 if (refcount_dec_and_test(&policy->refcnt))
834 xfrm_policy_destroy(policy);
835}
836
837static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
838{
839 int i;
840 for (i = npols - 1; i >= 0; --i)
841 xfrm_pol_put(pols[i]);
842}
843
844void __xfrm_state_destroy(struct xfrm_state *);
845
846static inline void __xfrm_state_put(struct xfrm_state *x)
847{
848 refcount_dec(&x->refcnt);
849}
850
851static inline void xfrm_state_put(struct xfrm_state *x)
852{
853 if (refcount_dec_and_test(&x->refcnt))
854 __xfrm_state_destroy(x);
855}
856
857static inline void xfrm_state_hold(struct xfrm_state *x)
858{
859 refcount_inc(&x->refcnt);
860}
861
862static inline bool addr_match(const void *token1, const void *token2,
863 unsigned int prefixlen)
864{
865 const __be32 *a1 = token1;
866 const __be32 *a2 = token2;
867 unsigned int pdw;
868 unsigned int pbi;
869
870 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
871 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
872
873 if (pdw)
874 if (memcmp(a1, a2, pdw << 2))
875 return false;
876
877 if (pbi) {
878 __be32 mask;
879
880 mask = htonl((0xffffffff) << (32 - pbi));
881
882 if ((a1[pdw] ^ a2[pdw]) & mask)
883 return false;
884 }
885
886 return true;
887}
888
889static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
890{
891 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
892 if (sizeof(long) == 4 && prefixlen == 0)
893 return true;
894 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
895}
896
897static __inline__
898__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
899{
900 __be16 port;
901 switch(fl->flowi_proto) {
902 case IPPROTO_TCP:
903 case IPPROTO_UDP:
904 case IPPROTO_UDPLITE:
905 case IPPROTO_SCTP:
906 port = uli->ports.sport;
907 break;
908 case IPPROTO_ICMP:
909 case IPPROTO_ICMPV6:
910 port = htons(uli->icmpt.type);
911 break;
912 case IPPROTO_MH:
913 port = htons(uli->mht.type);
914 break;
915 case IPPROTO_GRE:
916 port = htons(ntohl(uli->gre_key) >> 16);
917 break;
918 default:
919 port = 0; /*XXX*/
920 }
921 return port;
922}
923
924static __inline__
925__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
926{
927 __be16 port;
928 switch(fl->flowi_proto) {
929 case IPPROTO_TCP:
930 case IPPROTO_UDP:
931 case IPPROTO_UDPLITE:
932 case IPPROTO_SCTP:
933 port = uli->ports.dport;
934 break;
935 case IPPROTO_ICMP:
936 case IPPROTO_ICMPV6:
937 port = htons(uli->icmpt.code);
938 break;
939 case IPPROTO_GRE:
940 port = htons(ntohl(uli->gre_key) & 0xffff);
941 break;
942 default:
943 port = 0; /*XXX*/
944 }
945 return port;
946}
947
948bool xfrm_selector_match(const struct xfrm_selector *sel,
949 const struct flowi *fl, unsigned short family);
950
951#ifdef CONFIG_SECURITY_NETWORK_XFRM
952/* If neither has a context --> match
953 * Otherwise, both must have a context and the sids, doi, alg must match
954 */
955static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
956{
957 return ((!s1 && !s2) ||
958 (s1 && s2 &&
959 (s1->ctx_sid == s2->ctx_sid) &&
960 (s1->ctx_doi == s2->ctx_doi) &&
961 (s1->ctx_alg == s2->ctx_alg)));
962}
963#else
964static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
965{
966 return true;
967}
968#endif
969
970/* A struct encoding bundle of transformations to apply to some set of flow.
971 *
972 * xdst->child points to the next element of bundle.
973 * dst->xfrm points to an instanse of transformer.
974 *
975 * Due to unfortunate limitations of current routing cache, which we
976 * have no time to fix, it mirrors struct rtable and bound to the same
977 * routing key, including saddr,daddr. However, we can have many of
978 * bundles differing by session id. All the bundles grow from a parent
979 * policy rule.
980 */
981struct xfrm_dst {
982 union {
983 struct dst_entry dst;
984 struct rtable rt;
985 struct rt6_info rt6;
986 } u;
987 struct dst_entry *route;
988 struct dst_entry *child;
989 struct dst_entry *path;
990 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
991 int num_pols, num_xfrms;
992 u32 xfrm_genid;
993 u32 policy_genid;
994 u32 route_mtu_cached;
995 u32 child_mtu_cached;
996 u32 route_cookie;
997 u32 path_cookie;
998};
999
1000static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1001{
1002#ifdef CONFIG_XFRM
1003 if (dst->xfrm) {
1004 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1005
1006 return xdst->path;
1007 }
1008#endif
1009 return (struct dst_entry *) dst;
1010}
1011
1012static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1013{
1014#ifdef CONFIG_XFRM
1015 if (dst->xfrm) {
1016 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1017 return xdst->child;
1018 }
1019#endif
1020 return NULL;
1021}
1022
1023#ifdef CONFIG_XFRM
1024static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1025{
1026 xdst->child = child;
1027}
1028
1029static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1030{
1031 xfrm_pols_put(xdst->pols, xdst->num_pols);
1032 dst_release(xdst->route);
1033 if (likely(xdst->u.dst.xfrm))
1034 xfrm_state_put(xdst->u.dst.xfrm);
1035}
1036#endif
1037
1038void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1039
1040struct xfrm_offload {
1041 /* Output sequence number for replay protection on offloading. */
1042 struct {
1043 __u32 low;
1044 __u32 hi;
1045 } seq;
1046
1047 __u32 flags;
1048#define SA_DELETE_REQ 1
1049#define CRYPTO_DONE 2
1050#define CRYPTO_NEXT_DONE 4
1051#define CRYPTO_FALLBACK 8
1052#define XFRM_GSO_SEGMENT 16
1053#define XFRM_GRO 32
1054#define XFRM_ESP_NO_TRAILER 64
1055#define XFRM_DEV_RESUME 128
1056
1057 __u32 status;
1058#define CRYPTO_SUCCESS 1
1059#define CRYPTO_GENERIC_ERROR 2
1060#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1061#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1062#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1063#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1064#define CRYPTO_INVALID_PACKET_SYNTAX 64
1065#define CRYPTO_INVALID_PROTOCOL 128
1066
1067 __u8 proto;
1068};
1069
1070struct sec_path {
1071 refcount_t refcnt;
1072 int len;
1073 int olen;
1074
1075 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1076 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1077};
1078
1079static inline int secpath_exists(struct sk_buff *skb)
1080{
1081#ifdef CONFIG_XFRM
1082 return skb->sp != NULL;
1083#else
1084 return 0;
1085#endif
1086}
1087
1088static inline struct sec_path *
1089secpath_get(struct sec_path *sp)
1090{
1091 if (sp)
1092 refcount_inc(&sp->refcnt);
1093 return sp;
1094}
1095
1096void __secpath_destroy(struct sec_path *sp);
1097
1098static inline void
1099secpath_put(struct sec_path *sp)
1100{
1101 if (sp && refcount_dec_and_test(&sp->refcnt))
1102 __secpath_destroy(sp);
1103}
1104
1105struct sec_path *secpath_dup(struct sec_path *src);
1106int secpath_set(struct sk_buff *skb);
1107
1108static inline void
1109secpath_reset(struct sk_buff *skb)
1110{
1111#ifdef CONFIG_XFRM
1112 secpath_put(skb->sp);
1113 skb->sp = NULL;
1114#endif
1115}
1116
1117static inline int
1118xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1119{
1120 switch (family) {
1121 case AF_INET:
1122 return addr->a4 == 0;
1123 case AF_INET6:
1124 return ipv6_addr_any(&addr->in6);
1125 }
1126 return 0;
1127}
1128
1129static inline int
1130__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1131{
1132 return (tmpl->saddr.a4 &&
1133 tmpl->saddr.a4 != x->props.saddr.a4);
1134}
1135
1136static inline int
1137__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1138{
1139 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1140 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1141}
1142
1143static inline int
1144xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1145{
1146 switch (family) {
1147 case AF_INET:
1148 return __xfrm4_state_addr_cmp(tmpl, x);
1149 case AF_INET6:
1150 return __xfrm6_state_addr_cmp(tmpl, x);
1151 }
1152 return !0;
1153}
1154
1155#ifdef CONFIG_XFRM
1156int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1157 unsigned short family);
1158
1159static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1160 struct sk_buff *skb,
1161 unsigned int family, int reverse)
1162{
1163 struct net *net = dev_net(skb->dev);
1164 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1165
1166 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1167 return __xfrm_policy_check(sk, ndir, skb, family);
1168
1169 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1170 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1171 __xfrm_policy_check(sk, ndir, skb, family);
1172}
1173
1174static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1175{
1176 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1177}
1178
1179static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1180{
1181 return xfrm_policy_check(sk, dir, skb, AF_INET);
1182}
1183
1184static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1185{
1186 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1187}
1188
1189static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1190 struct sk_buff *skb)
1191{
1192 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1193}
1194
1195static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1196 struct sk_buff *skb)
1197{
1198 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1199}
1200
1201int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1202 unsigned int family, int reverse);
1203
1204static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1205 unsigned int family)
1206{
1207 return __xfrm_decode_session(skb, fl, family, 0);
1208}
1209
1210static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1211 struct flowi *fl,
1212 unsigned int family)
1213{
1214 return __xfrm_decode_session(skb, fl, family, 1);
1215}
1216
1217int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1218
1219static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1220{
1221 struct net *net = dev_net(skb->dev);
1222
1223 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1224 (skb_dst(skb)->flags & DST_NOXFRM) ||
1225 __xfrm_route_forward(skb, family);
1226}
1227
1228static inline int xfrm4_route_forward(struct sk_buff *skb)
1229{
1230 return xfrm_route_forward(skb, AF_INET);
1231}
1232
1233static inline int xfrm6_route_forward(struct sk_buff *skb)
1234{
1235 return xfrm_route_forward(skb, AF_INET6);
1236}
1237
1238int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1239
1240static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1241{
1242 sk->sk_policy[0] = NULL;
1243 sk->sk_policy[1] = NULL;
1244 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1245 return __xfrm_sk_clone_policy(sk, osk);
1246 return 0;
1247}
1248
1249int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1250
1251static inline void xfrm_sk_free_policy(struct sock *sk)
1252{
1253 struct xfrm_policy *pol;
1254
1255 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1256 if (unlikely(pol != NULL)) {
1257 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1258 sk->sk_policy[0] = NULL;
1259 }
1260 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1261 if (unlikely(pol != NULL)) {
1262 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1263 sk->sk_policy[1] = NULL;
1264 }
1265}
1266
1267#else
1268
1269static inline void xfrm_sk_free_policy(struct sock *sk) {}
1270static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1271static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1272static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1273static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1274{
1275 return 1;
1276}
1277static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1278{
1279 return 1;
1280}
1281static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1282{
1283 return 1;
1284}
1285static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1286 struct flowi *fl,
1287 unsigned int family)
1288{
1289 return -ENOSYS;
1290}
1291static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1292 struct sk_buff *skb)
1293{
1294 return 1;
1295}
1296static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1297 struct sk_buff *skb)
1298{
1299 return 1;
1300}
1301#endif
1302
1303static __inline__
1304xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1305{
1306 switch (family){
1307 case AF_INET:
1308 return (xfrm_address_t *)&fl->u.ip4.daddr;
1309 case AF_INET6:
1310 return (xfrm_address_t *)&fl->u.ip6.daddr;
1311 }
1312 return NULL;
1313}
1314
1315static __inline__
1316xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1317{
1318 switch (family){
1319 case AF_INET:
1320 return (xfrm_address_t *)&fl->u.ip4.saddr;
1321 case AF_INET6:
1322 return (xfrm_address_t *)&fl->u.ip6.saddr;
1323 }
1324 return NULL;
1325}
1326
1327static __inline__
1328void xfrm_flowi_addr_get(const struct flowi *fl,
1329 xfrm_address_t *saddr, xfrm_address_t *daddr,
1330 unsigned short family)
1331{
1332 switch(family) {
1333 case AF_INET:
1334 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1335 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1336 break;
1337 case AF_INET6:
1338 saddr->in6 = fl->u.ip6.saddr;
1339 daddr->in6 = fl->u.ip6.daddr;
1340 break;
1341 }
1342}
1343
1344static __inline__ int
1345__xfrm4_state_addr_check(const struct xfrm_state *x,
1346 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1347{
1348 if (daddr->a4 == x->id.daddr.a4 &&
1349 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1350 return 1;
1351 return 0;
1352}
1353
1354static __inline__ int
1355__xfrm6_state_addr_check(const struct xfrm_state *x,
1356 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1357{
1358 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1359 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1360 ipv6_addr_any((struct in6_addr *)saddr) ||
1361 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1362 return 1;
1363 return 0;
1364}
1365
1366static __inline__ int
1367xfrm_state_addr_check(const struct xfrm_state *x,
1368 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1369 unsigned short family)
1370{
1371 switch (family) {
1372 case AF_INET:
1373 return __xfrm4_state_addr_check(x, daddr, saddr);
1374 case AF_INET6:
1375 return __xfrm6_state_addr_check(x, daddr, saddr);
1376 }
1377 return 0;
1378}
1379
1380static __inline__ int
1381xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1382 unsigned short family)
1383{
1384 switch (family) {
1385 case AF_INET:
1386 return __xfrm4_state_addr_check(x,
1387 (const xfrm_address_t *)&fl->u.ip4.daddr,
1388 (const xfrm_address_t *)&fl->u.ip4.saddr);
1389 case AF_INET6:
1390 return __xfrm6_state_addr_check(x,
1391 (const xfrm_address_t *)&fl->u.ip6.daddr,
1392 (const xfrm_address_t *)&fl->u.ip6.saddr);
1393 }
1394 return 0;
1395}
1396
1397static inline int xfrm_state_kern(const struct xfrm_state *x)
1398{
1399 return atomic_read(&x->tunnel_users);
1400}
1401
1402static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1403{
1404 return (!userproto || proto == userproto ||
1405 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1406 proto == IPPROTO_ESP ||
1407 proto == IPPROTO_COMP)));
1408}
1409
1410/*
1411 * xfrm algorithm information
1412 */
1413struct xfrm_algo_aead_info {
1414 char *geniv;
1415 u16 icv_truncbits;
1416};
1417
1418struct xfrm_algo_auth_info {
1419 u16 icv_truncbits;
1420 u16 icv_fullbits;
1421};
1422
1423struct xfrm_algo_encr_info {
1424 char *geniv;
1425 u16 blockbits;
1426 u16 defkeybits;
1427};
1428
1429struct xfrm_algo_comp_info {
1430 u16 threshold;
1431};
1432
1433struct xfrm_algo_desc {
1434 char *name;
1435 char *compat;
1436 u8 available:1;
1437 u8 pfkey_supported:1;
1438 union {
1439 struct xfrm_algo_aead_info aead;
1440 struct xfrm_algo_auth_info auth;
1441 struct xfrm_algo_encr_info encr;
1442 struct xfrm_algo_comp_info comp;
1443 } uinfo;
1444 struct sadb_alg desc;
1445};
1446
1447/* XFRM protocol handlers. */
1448struct xfrm4_protocol {
1449 int (*handler)(struct sk_buff *skb);
1450 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1451 int encap_type);
1452 int (*cb_handler)(struct sk_buff *skb, int err);
1453 int (*err_handler)(struct sk_buff *skb, u32 info);
1454
1455 struct xfrm4_protocol __rcu *next;
1456 int priority;
1457};
1458
1459struct xfrm6_protocol {
1460 int (*handler)(struct sk_buff *skb);
1461 int (*cb_handler)(struct sk_buff *skb, int err);
1462 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1463 u8 type, u8 code, int offset, __be32 info);
1464
1465 struct xfrm6_protocol __rcu *next;
1466 int priority;
1467};
1468
1469/* XFRM tunnel handlers. */
1470struct xfrm_tunnel {
1471 int (*handler)(struct sk_buff *skb);
1472 int (*err_handler)(struct sk_buff *skb, u32 info);
1473
1474 struct xfrm_tunnel __rcu *next;
1475 int priority;
1476};
1477
1478struct xfrm6_tunnel {
1479 int (*handler)(struct sk_buff *skb);
1480 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1481 u8 type, u8 code, int offset, __be32 info);
1482 struct xfrm6_tunnel __rcu *next;
1483 int priority;
1484};
1485
1486void xfrm_init(void);
1487void xfrm4_init(void);
1488int xfrm_state_init(struct net *net);
1489void xfrm_state_fini(struct net *net);
1490void xfrm4_state_init(void);
1491void xfrm4_protocol_init(void);
1492#ifdef CONFIG_XFRM
1493int xfrm6_init(void);
1494void xfrm6_fini(void);
1495int xfrm6_state_init(void);
1496void xfrm6_state_fini(void);
1497int xfrm6_protocol_init(void);
1498void xfrm6_protocol_fini(void);
1499#else
1500static inline int xfrm6_init(void)
1501{
1502 return 0;
1503}
1504static inline void xfrm6_fini(void)
1505{
1506 ;
1507}
1508#endif
1509
1510#ifdef CONFIG_XFRM_STATISTICS
1511int xfrm_proc_init(struct net *net);
1512void xfrm_proc_fini(struct net *net);
1513#endif
1514
1515int xfrm_sysctl_init(struct net *net);
1516#ifdef CONFIG_SYSCTL
1517void xfrm_sysctl_fini(struct net *net);
1518#else
1519static inline void xfrm_sysctl_fini(struct net *net)
1520{
1521}
1522#endif
1523
1524void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1525 struct xfrm_address_filter *filter);
1526int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1527 int (*func)(struct xfrm_state *, int, void*), void *);
1528void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1529struct xfrm_state *xfrm_state_alloc(struct net *net);
1530struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1531 const xfrm_address_t *saddr,
1532 const struct flowi *fl,
1533 struct xfrm_tmpl *tmpl,
1534 struct xfrm_policy *pol, int *err,
1535 unsigned short family);
1536struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1537 xfrm_address_t *daddr,
1538 xfrm_address_t *saddr,
1539 unsigned short family,
1540 u8 mode, u8 proto, u32 reqid);
1541struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1542 unsigned short family);
1543int xfrm_state_check_expire(struct xfrm_state *x);
1544void xfrm_state_insert(struct xfrm_state *x);
1545int xfrm_state_add(struct xfrm_state *x);
1546int xfrm_state_update(struct xfrm_state *x);
1547struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1548 const xfrm_address_t *daddr, __be32 spi,
1549 u8 proto, unsigned short family);
1550struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1551 const xfrm_address_t *daddr,
1552 const xfrm_address_t *saddr,
1553 u8 proto,
1554 unsigned short family);
1555#ifdef CONFIG_XFRM_SUB_POLICY
1556int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1557 unsigned short family, struct net *net);
1558int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1559 unsigned short family);
1560#else
1561static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1562 int n, unsigned short family, struct net *net)
1563{
1564 return -ENOSYS;
1565}
1566
1567static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1568 int n, unsigned short family)
1569{
1570 return -ENOSYS;
1571}
1572#endif
1573
1574struct xfrmk_sadinfo {
1575 u32 sadhcnt; /* current hash bkts */
1576 u32 sadhmcnt; /* max allowed hash bkts */
1577 u32 sadcnt; /* current running count */
1578};
1579
1580struct xfrmk_spdinfo {
1581 u32 incnt;
1582 u32 outcnt;
1583 u32 fwdcnt;
1584 u32 inscnt;
1585 u32 outscnt;
1586 u32 fwdscnt;
1587 u32 spdhcnt;
1588 u32 spdhmcnt;
1589};
1590
1591struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1592int xfrm_state_delete(struct xfrm_state *x);
1593int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1594int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1595void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1596void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1597u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1598int xfrm_init_replay(struct xfrm_state *x);
1599int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1600int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1601int xfrm_init_state(struct xfrm_state *x);
1602int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1603int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1604int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1605int xfrm_trans_queue(struct sk_buff *skb,
1606 int (*finish)(struct net *, struct sock *,
1607 struct sk_buff *));
1608int xfrm_output_resume(struct sk_buff *skb, int err);
1609int xfrm_output(struct sock *sk, struct sk_buff *skb);
1610int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1611void xfrm_local_error(struct sk_buff *skb, int mtu);
1612int xfrm4_extract_header(struct sk_buff *skb);
1613int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1614int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1615 int encap_type);
1616int xfrm4_transport_finish(struct sk_buff *skb, int async);
1617int xfrm4_rcv(struct sk_buff *skb);
1618int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1619
1620static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1621{
1622 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1623 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1624 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1625 return xfrm_input(skb, nexthdr, spi, 0);
1626}
1627
1628int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1629int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1630int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1631int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1632int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1633int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1634int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1635int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1636int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1637void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1638int xfrm6_extract_header(struct sk_buff *skb);
1639int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1640int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1641 struct ip6_tnl *t);
1642int xfrm6_transport_finish(struct sk_buff *skb, int async);
1643int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1644int xfrm6_rcv(struct sk_buff *skb);
1645int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1646 xfrm_address_t *saddr, u8 proto);
1647void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1648int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1649int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1650int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1651int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1652int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1653__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1654__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1655int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1656int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1657int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1658int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1659int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1660 u8 **prevhdr);
1661
1662#ifdef CONFIG_XFRM
1663int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1664int xfrm_user_policy(struct sock *sk, int optname,
1665 u8 __user *optval, int optlen);
1666#else
1667static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1668{
1669 return -ENOPROTOOPT;
1670}
1671
1672static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1673{
1674 /* should not happen */
1675 kfree_skb(skb);
1676 return 0;
1677}
1678#endif
1679
1680struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1681 const xfrm_address_t *saddr,
1682 const xfrm_address_t *daddr,
1683 int family, u32 mark);
1684
1685struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1686
1687void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1688int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1689 int (*func)(struct xfrm_policy *, int, int, void*),
1690 void *);
1691void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1692int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1693struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1694 u8 type, int dir,
1695 struct xfrm_selector *sel,
1696 struct xfrm_sec_ctx *ctx, int delete,
1697 int *err);
1698struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1699 u32 id, int delete, int *err);
1700int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1701void xfrm_policy_hash_rebuild(struct net *net);
1702u32 xfrm_get_acqseq(void);
1703int verify_spi_info(u8 proto, u32 min, u32 max);
1704int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1705struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1706 u8 mode, u32 reqid, u8 proto,
1707 const xfrm_address_t *daddr,
1708 const xfrm_address_t *saddr, int create,
1709 unsigned short family);
1710int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1711
1712#ifdef CONFIG_XFRM_MIGRATE
1713int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1714 const struct xfrm_migrate *m, int num_bundles,
1715 const struct xfrm_kmaddress *k,
1716 const struct xfrm_encap_tmpl *encap);
1717struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1718struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1719 struct xfrm_migrate *m,
1720 struct xfrm_encap_tmpl *encap);
1721int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1722 struct xfrm_migrate *m, int num_bundles,
1723 struct xfrm_kmaddress *k, struct net *net,
1724 struct xfrm_encap_tmpl *encap);
1725#endif
1726
1727int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1728void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1729int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1730 xfrm_address_t *addr);
1731
1732void xfrm_input_init(void);
1733int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1734
1735void xfrm_probe_algs(void);
1736int xfrm_count_pfkey_auth_supported(void);
1737int xfrm_count_pfkey_enc_supported(void);
1738struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1739struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1740struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1741struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1742struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1743struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1744struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1745struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1746struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1747 int probe);
1748
1749static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1750 const xfrm_address_t *b)
1751{
1752 return ipv6_addr_equal((const struct in6_addr *)a,
1753 (const struct in6_addr *)b);
1754}
1755
1756static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1757 const xfrm_address_t *b,
1758 sa_family_t family)
1759{
1760 switch (family) {
1761 default:
1762 case AF_INET:
1763 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1764 case AF_INET6:
1765 return xfrm6_addr_equal(a, b);
1766 }
1767}
1768
1769static inline int xfrm_policy_id2dir(u32 index)
1770{
1771 return index & 7;
1772}
1773
1774#ifdef CONFIG_XFRM
1775static inline int xfrm_aevent_is_on(struct net *net)
1776{
1777 struct sock *nlsk;
1778 int ret = 0;
1779
1780 rcu_read_lock();
1781 nlsk = rcu_dereference(net->xfrm.nlsk);
1782 if (nlsk)
1783 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1784 rcu_read_unlock();
1785 return ret;
1786}
1787
1788static inline int xfrm_acquire_is_on(struct net *net)
1789{
1790 struct sock *nlsk;
1791 int ret = 0;
1792
1793 rcu_read_lock();
1794 nlsk = rcu_dereference(net->xfrm.nlsk);
1795 if (nlsk)
1796 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1797 rcu_read_unlock();
1798
1799 return ret;
1800}
1801#endif
1802
1803static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1804{
1805 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1806}
1807
1808static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1809{
1810 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1811}
1812
1813static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1814{
1815 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1816}
1817
1818static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1819{
1820 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1821}
1822
1823#ifdef CONFIG_XFRM_MIGRATE
1824static inline int xfrm_replay_clone(struct xfrm_state *x,
1825 struct xfrm_state *orig)
1826{
1827 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1828 GFP_KERNEL);
1829 if (!x->replay_esn)
1830 return -ENOMEM;
1831
1832 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1833 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1834
1835 x->preplay_esn = kmemdup(x->replay_esn,
1836 xfrm_replay_state_esn_len(x->replay_esn),
1837 GFP_KERNEL);
1838 if (!x->preplay_esn) {
1839 kfree(x->replay_esn);
1840 return -ENOMEM;
1841 }
1842
1843 return 0;
1844}
1845
1846static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1847{
1848 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1849}
1850
1851
1852static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1853{
1854 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1855}
1856
1857static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1858{
1859 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1860}
1861
1862static inline void xfrm_states_put(struct xfrm_state **states, int n)
1863{
1864 int i;
1865 for (i = 0; i < n; i++)
1866 xfrm_state_put(*(states + i));
1867}
1868
1869static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1870{
1871 int i;
1872 for (i = 0; i < n; i++)
1873 xfrm_state_delete(*(states + i));
1874}
1875#endif
1876
1877#ifdef CONFIG_XFRM
1878static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1879{
1880 return skb->sp->xvec[skb->sp->len - 1];
1881}
1882#endif
1883
1884static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1885{
1886#ifdef CONFIG_XFRM
1887 struct sec_path *sp = skb->sp;
1888
1889 if (!sp || !sp->olen || sp->len != sp->olen)
1890 return NULL;
1891
1892 return &sp->ovec[sp->olen - 1];
1893#else
1894 return NULL;
1895#endif
1896}
1897
1898void __init xfrm_dev_init(void);
1899
1900#ifdef CONFIG_XFRM_OFFLOAD
1901void xfrm_dev_resume(struct sk_buff *skb);
1902void xfrm_dev_backlog(struct softnet_data *sd);
1903struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1904int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1905 struct xfrm_user_offload *xuo);
1906bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1907
1908static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1909{
1910 struct xfrm_state_offload *xso = &x->xso;
1911
1912 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1913 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1914}
1915
1916static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1917{
1918 struct xfrm_state *x = dst->xfrm;
1919 struct xfrm_dst *xdst;
1920
1921 if (!x || !x->type_offload)
1922 return false;
1923
1924 xdst = (struct xfrm_dst *) dst;
1925 if (!x->xso.offload_handle && !xdst->child->xfrm)
1926 return true;
1927 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1928 !xdst->child->xfrm)
1929 return true;
1930
1931 return false;
1932}
1933
1934static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1935{
1936 struct xfrm_state_offload *xso = &x->xso;
1937
1938 if (xso->dev)
1939 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1940}
1941
1942static inline void xfrm_dev_state_free(struct xfrm_state *x)
1943{
1944 struct xfrm_state_offload *xso = &x->xso;
1945 struct net_device *dev = xso->dev;
1946
1947 if (dev && dev->xfrmdev_ops) {
1948 if (dev->xfrmdev_ops->xdo_dev_state_free)
1949 dev->xfrmdev_ops->xdo_dev_state_free(x);
1950 xso->dev = NULL;
1951 dev_put(dev);
1952 }
1953}
1954#else
1955static inline void xfrm_dev_resume(struct sk_buff *skb)
1956{
1957}
1958
1959static inline void xfrm_dev_backlog(struct softnet_data *sd)
1960{
1961}
1962
1963static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1964{
1965 return skb;
1966}
1967
1968static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1969{
1970 return 0;
1971}
1972
1973static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1974{
1975}
1976
1977static inline void xfrm_dev_state_free(struct xfrm_state *x)
1978{
1979}
1980
1981static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1982{
1983 return false;
1984}
1985
1986static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1987{
1988}
1989
1990static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1991{
1992 return false;
1993}
1994#endif
1995
1996static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1997{
1998 if (attrs[XFRMA_MARK])
1999 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2000 else
2001 m->v = m->m = 0;
2002
2003 return m->v & m->m;
2004}
2005
2006static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2007{
2008 int ret = 0;
2009
2010 if (m->m | m->v)
2011 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2012 return ret;
2013}
2014
2015static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2016 unsigned int family)
2017{
2018 bool tunnel = false;
2019
2020 switch(family) {
2021 case AF_INET:
2022 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2023 tunnel = true;
2024 break;
2025 case AF_INET6:
2026 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2027 tunnel = true;
2028 break;
2029 }
2030 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2031 return -EINVAL;
2032
2033 return 0;
2034}
2035#endif /* _NET_XFRM_H */
1/* 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#include <linux/sockptr.h>
19
20#include <net/sock.h>
21#include <net/dst.h>
22#include <net/ip.h>
23#include <net/route.h>
24#include <net/ipv6.h>
25#include <net/ip6_fib.h>
26#include <net/flow.h>
27#include <net/gro_cells.h>
28
29#include <linux/interrupt.h>
30
31#ifdef CONFIG_XFRM_STATISTICS
32#include <net/snmp.h>
33#endif
34
35#define XFRM_PROTO_ESP 50
36#define XFRM_PROTO_AH 51
37#define XFRM_PROTO_COMP 108
38#define XFRM_PROTO_IPIP 4
39#define XFRM_PROTO_IPV6 41
40#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
41#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
42
43#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
44#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
45#define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51
52#ifdef CONFIG_XFRM_STATISTICS
53#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54#else
55#define XFRM_INC_STATS(net, field) ((void)(net))
56#endif
57
58
59/* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 u8 dying;
124 u8 proto;
125 u32 seq;
126 struct xfrm_address_filter *filter;
127};
128
129struct xfrm_state_offload {
130 struct net_device *dev;
131 struct net_device *real_dev;
132 unsigned long offload_handle;
133 unsigned int num_exthdrs;
134 u8 flags;
135};
136
137struct xfrm_mode {
138 u8 encap;
139 u8 family;
140 u8 flags;
141};
142
143/* Flags for xfrm_mode. */
144enum {
145 XFRM_MODE_FLAG_TUNNEL = 1,
146};
147
148/* Full description of state of transformer. */
149struct xfrm_state {
150 possible_net_t xs_net;
151 union {
152 struct hlist_node gclist;
153 struct hlist_node bydst;
154 };
155 struct hlist_node bysrc;
156 struct hlist_node byspi;
157
158 refcount_t refcnt;
159 spinlock_t lock;
160
161 struct xfrm_id id;
162 struct xfrm_selector sel;
163 struct xfrm_mark mark;
164 u32 if_id;
165 u32 tfcpad;
166
167 u32 genid;
168
169 /* Key manager bits */
170 struct xfrm_state_walk km;
171
172 /* Parameters of this state. */
173 struct {
174 u32 reqid;
175 u8 mode;
176 u8 replay_window;
177 u8 aalgo, ealgo, calgo;
178 u8 flags;
179 u16 family;
180 xfrm_address_t saddr;
181 int header_len;
182 int trailer_len;
183 u32 extra_flags;
184 struct xfrm_mark smark;
185 } props;
186
187 struct xfrm_lifetime_cfg lft;
188
189 /* Data for transformer */
190 struct xfrm_algo_auth *aalg;
191 struct xfrm_algo *ealg;
192 struct xfrm_algo *calg;
193 struct xfrm_algo_aead *aead;
194 const char *geniv;
195
196 /* Data for encapsulator */
197 struct xfrm_encap_tmpl *encap;
198 struct sock __rcu *encap_sk;
199
200 /* Data for care-of address */
201 xfrm_address_t *coaddr;
202
203 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
204 struct xfrm_state *tunnel;
205
206 /* If a tunnel, number of users + 1 */
207 atomic_t tunnel_users;
208
209 /* State for replay detection */
210 struct xfrm_replay_state replay;
211 struct xfrm_replay_state_esn *replay_esn;
212
213 /* Replay detection state at the time we sent the last notification */
214 struct xfrm_replay_state preplay;
215 struct xfrm_replay_state_esn *preplay_esn;
216
217 /* The functions for replay detection. */
218 const struct xfrm_replay *repl;
219
220 /* internal flag that only holds state for delayed aevent at the
221 * moment
222 */
223 u32 xflags;
224
225 /* Replay detection notification settings */
226 u32 replay_maxage;
227 u32 replay_maxdiff;
228
229 /* Replay detection notification timer */
230 struct timer_list rtimer;
231
232 /* Statistics */
233 struct xfrm_stats stats;
234
235 struct xfrm_lifetime_cur curlft;
236 struct hrtimer mtimer;
237
238 struct xfrm_state_offload xso;
239
240 /* used to fix curlft->add_time when changing date */
241 long saved_tmo;
242
243 /* Last used time */
244 time64_t lastused;
245
246 struct page_frag xfrag;
247
248 /* Reference to data common to all the instances of this
249 * transformer. */
250 const struct xfrm_type *type;
251 struct xfrm_mode inner_mode;
252 struct xfrm_mode inner_mode_iaf;
253 struct xfrm_mode outer_mode;
254
255 const struct xfrm_type_offload *type_offload;
256
257 /* Security context */
258 struct xfrm_sec_ctx *security;
259
260 /* Private data of this transformer, format is opaque,
261 * interpreted by xfrm_type methods. */
262 void *data;
263};
264
265static inline struct net *xs_net(struct xfrm_state *x)
266{
267 return read_pnet(&x->xs_net);
268}
269
270/* xflags - make enum if more show up */
271#define XFRM_TIME_DEFER 1
272#define XFRM_SOFT_EXPIRE 2
273
274enum {
275 XFRM_STATE_VOID,
276 XFRM_STATE_ACQ,
277 XFRM_STATE_VALID,
278 XFRM_STATE_ERROR,
279 XFRM_STATE_EXPIRED,
280 XFRM_STATE_DEAD
281};
282
283/* callback structure passed from either netlink or pfkey */
284struct km_event {
285 union {
286 u32 hard;
287 u32 proto;
288 u32 byid;
289 u32 aevent;
290 u32 type;
291 } data;
292
293 u32 seq;
294 u32 portid;
295 u32 event;
296 struct net *net;
297};
298
299struct xfrm_replay {
300 void (*advance)(struct xfrm_state *x, __be32 net_seq);
301 int (*check)(struct xfrm_state *x,
302 struct sk_buff *skb,
303 __be32 net_seq);
304 int (*recheck)(struct xfrm_state *x,
305 struct sk_buff *skb,
306 __be32 net_seq);
307 void (*notify)(struct xfrm_state *x, int event);
308 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
309};
310
311struct xfrm_if_cb {
312 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
313 unsigned short family);
314};
315
316void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
317void xfrm_if_unregister_cb(void);
318
319struct net_device;
320struct xfrm_type;
321struct xfrm_dst;
322struct xfrm_policy_afinfo {
323 struct dst_ops *dst_ops;
324 struct dst_entry *(*dst_lookup)(struct net *net,
325 int tos, int oif,
326 const xfrm_address_t *saddr,
327 const xfrm_address_t *daddr,
328 u32 mark);
329 int (*get_saddr)(struct net *net, int oif,
330 xfrm_address_t *saddr,
331 xfrm_address_t *daddr,
332 u32 mark);
333 int (*fill_dst)(struct xfrm_dst *xdst,
334 struct net_device *dev,
335 const struct flowi *fl);
336 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
337};
338
339int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
340void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
341void km_policy_notify(struct xfrm_policy *xp, int dir,
342 const struct km_event *c);
343void km_state_notify(struct xfrm_state *x, const struct km_event *c);
344
345struct xfrm_tmpl;
346int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
347 struct xfrm_policy *pol);
348void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
349int __xfrm_state_delete(struct xfrm_state *x);
350
351struct xfrm_state_afinfo {
352 u8 family;
353 u8 proto;
354
355 const struct xfrm_type_offload *type_offload_esp;
356
357 const struct xfrm_type *type_esp;
358 const struct xfrm_type *type_ipip;
359 const struct xfrm_type *type_ipip6;
360 const struct xfrm_type *type_comp;
361 const struct xfrm_type *type_ah;
362 const struct xfrm_type *type_routing;
363 const struct xfrm_type *type_dstopts;
364
365 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
366 int (*transport_finish)(struct sk_buff *skb,
367 int async);
368 void (*local_error)(struct sk_buff *skb, u32 mtu);
369};
370
371int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
372int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
373struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
374struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
375
376struct xfrm_input_afinfo {
377 u8 family;
378 bool is_ipip;
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};
407
408int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
409void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
410
411struct xfrm_type_offload {
412 char *description;
413 struct module *owner;
414 u8 proto;
415 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
416 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
417 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
418};
419
420int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
421void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
422
423static inline int xfrm_af2proto(unsigned int family)
424{
425 switch(family) {
426 case AF_INET:
427 return IPPROTO_IPIP;
428 case AF_INET6:
429 return IPPROTO_IPV6;
430 default:
431 return 0;
432 }
433}
434
435static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
436{
437 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
438 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
439 return &x->inner_mode;
440 else
441 return &x->inner_mode_iaf;
442}
443
444struct xfrm_tmpl {
445/* id in template is interpreted as:
446 * daddr - destination of tunnel, may be zero for transport mode.
447 * spi - zero to acquire spi. Not zero if spi is static, then
448 * daddr must be fixed too.
449 * proto - AH/ESP/IPCOMP
450 */
451 struct xfrm_id id;
452
453/* Source address of tunnel. Ignored, if it is not a tunnel. */
454 xfrm_address_t saddr;
455
456 unsigned short encap_family;
457
458 u32 reqid;
459
460/* Mode: transport, tunnel etc. */
461 u8 mode;
462
463/* Sharing mode: unique, this session only, this user only etc. */
464 u8 share;
465
466/* May skip this transfomration if no SA is found */
467 u8 optional;
468
469/* Skip aalgos/ealgos/calgos checks. */
470 u8 allalgs;
471
472/* Bit mask of algos allowed for acquisition */
473 u32 aalgos;
474 u32 ealgos;
475 u32 calgos;
476};
477
478#define XFRM_MAX_DEPTH 6
479#define XFRM_MAX_OFFLOAD_DEPTH 1
480
481struct xfrm_policy_walk_entry {
482 struct list_head all;
483 u8 dead;
484};
485
486struct xfrm_policy_walk {
487 struct xfrm_policy_walk_entry walk;
488 u8 type;
489 u32 seq;
490};
491
492struct xfrm_policy_queue {
493 struct sk_buff_head hold_queue;
494 struct timer_list hold_timer;
495 unsigned long timeout;
496};
497
498struct xfrm_policy {
499 possible_net_t xp_net;
500 struct hlist_node bydst;
501 struct hlist_node byidx;
502
503 /* This lock only affects elements except for entry. */
504 rwlock_t lock;
505 refcount_t refcnt;
506 u32 pos;
507 struct timer_list timer;
508
509 atomic_t genid;
510 u32 priority;
511 u32 index;
512 u32 if_id;
513 struct xfrm_mark mark;
514 struct xfrm_selector selector;
515 struct xfrm_lifetime_cfg lft;
516 struct xfrm_lifetime_cur curlft;
517 struct xfrm_policy_walk_entry walk;
518 struct xfrm_policy_queue polq;
519 bool bydst_reinsert;
520 u8 type;
521 u8 action;
522 u8 flags;
523 u8 xfrm_nr;
524 u16 family;
525 struct xfrm_sec_ctx *security;
526 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
527 struct hlist_node bydst_inexact_list;
528 struct rcu_head rcu;
529};
530
531static inline struct net *xp_net(const struct xfrm_policy *xp)
532{
533 return read_pnet(&xp->xp_net);
534}
535
536struct xfrm_kmaddress {
537 xfrm_address_t local;
538 xfrm_address_t remote;
539 u32 reserved;
540 u16 family;
541};
542
543struct xfrm_migrate {
544 xfrm_address_t old_daddr;
545 xfrm_address_t old_saddr;
546 xfrm_address_t new_daddr;
547 xfrm_address_t new_saddr;
548 u8 proto;
549 u8 mode;
550 u16 reserved;
551 u32 reqid;
552 u16 old_family;
553 u16 new_family;
554};
555
556#define XFRM_KM_TIMEOUT 30
557/* what happened */
558#define XFRM_REPLAY_UPDATE XFRM_AE_CR
559#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
560
561/* default aevent timeout in units of 100ms */
562#define XFRM_AE_ETIME 10
563/* Async Event timer multiplier */
564#define XFRM_AE_ETH_M 10
565/* default seq threshold size */
566#define XFRM_AE_SEQT_SIZE 2
567
568struct xfrm_mgr {
569 struct list_head list;
570 int (*notify)(struct xfrm_state *x, const struct km_event *c);
571 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
572 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
573 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
574 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
575 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
576 int (*migrate)(const struct xfrm_selector *sel,
577 u8 dir, u8 type,
578 const struct xfrm_migrate *m,
579 int num_bundles,
580 const struct xfrm_kmaddress *k,
581 const struct xfrm_encap_tmpl *encap);
582 bool (*is_alive)(const struct km_event *c);
583};
584
585int xfrm_register_km(struct xfrm_mgr *km);
586int xfrm_unregister_km(struct xfrm_mgr *km);
587
588struct xfrm_tunnel_skb_cb {
589 union {
590 struct inet_skb_parm h4;
591 struct inet6_skb_parm h6;
592 } header;
593
594 union {
595 struct ip_tunnel *ip4;
596 struct ip6_tnl *ip6;
597 } tunnel;
598};
599
600#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
601
602/*
603 * This structure is used for the duration where packets are being
604 * transformed by IPsec. As soon as the packet leaves IPsec the
605 * area beyond the generic IP part may be overwritten.
606 */
607struct xfrm_skb_cb {
608 struct xfrm_tunnel_skb_cb header;
609
610 /* Sequence number for replay protection. */
611 union {
612 struct {
613 __u32 low;
614 __u32 hi;
615 } output;
616 struct {
617 __be32 low;
618 __be32 hi;
619 } input;
620 } seq;
621};
622
623#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
624
625/*
626 * This structure is used by the afinfo prepare_input/prepare_output functions
627 * to transmit header information to the mode input/output functions.
628 */
629struct xfrm_mode_skb_cb {
630 struct xfrm_tunnel_skb_cb header;
631
632 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
633 __be16 id;
634 __be16 frag_off;
635
636 /* IP header length (excluding options or extension headers). */
637 u8 ihl;
638
639 /* TOS for IPv4, class for IPv6. */
640 u8 tos;
641
642 /* TTL for IPv4, hop limitfor IPv6. */
643 u8 ttl;
644
645 /* Protocol for IPv4, NH for IPv6. */
646 u8 protocol;
647
648 /* Option length for IPv4, zero for IPv6. */
649 u8 optlen;
650
651 /* Used by IPv6 only, zero for IPv4. */
652 u8 flow_lbl[3];
653};
654
655#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
656
657/*
658 * This structure is used by the input processing to locate the SPI and
659 * related information.
660 */
661struct xfrm_spi_skb_cb {
662 struct xfrm_tunnel_skb_cb header;
663
664 unsigned int daddroff;
665 unsigned int family;
666 __be32 seq;
667};
668
669#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
670
671#ifdef CONFIG_AUDITSYSCALL
672static inline struct audit_buffer *xfrm_audit_start(const char *op)
673{
674 struct audit_buffer *audit_buf = NULL;
675
676 if (audit_enabled == AUDIT_OFF)
677 return NULL;
678 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
679 AUDIT_MAC_IPSEC_EVENT);
680 if (audit_buf == NULL)
681 return NULL;
682 audit_log_format(audit_buf, "op=%s", op);
683 return audit_buf;
684}
685
686static inline void xfrm_audit_helper_usrinfo(bool task_valid,
687 struct audit_buffer *audit_buf)
688{
689 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
690 audit_get_loginuid(current) :
691 INVALID_UID);
692 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
693 AUDIT_SID_UNSET;
694
695 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
696 audit_log_task_context(audit_buf);
697}
698
699void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
700void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
701 bool task_valid);
702void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
703void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
704void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
705 struct sk_buff *skb);
706void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
707 __be32 net_seq);
708void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
709void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
710 __be32 net_seq);
711void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
712 u8 proto);
713#else
714
715static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
716 bool task_valid)
717{
718}
719
720static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
721 bool task_valid)
722{
723}
724
725static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
726 bool task_valid)
727{
728}
729
730static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
731 bool task_valid)
732{
733}
734
735static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
736 struct sk_buff *skb)
737{
738}
739
740static inline void xfrm_audit_state_replay(struct xfrm_state *x,
741 struct sk_buff *skb, __be32 net_seq)
742{
743}
744
745static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
746 u16 family)
747{
748}
749
750static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
751 __be32 net_spi, __be32 net_seq)
752{
753}
754
755static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
756 struct sk_buff *skb, u8 proto)
757{
758}
759#endif /* CONFIG_AUDITSYSCALL */
760
761static inline void xfrm_pol_hold(struct xfrm_policy *policy)
762{
763 if (likely(policy != NULL))
764 refcount_inc(&policy->refcnt);
765}
766
767void xfrm_policy_destroy(struct xfrm_policy *policy);
768
769static inline void xfrm_pol_put(struct xfrm_policy *policy)
770{
771 if (refcount_dec_and_test(&policy->refcnt))
772 xfrm_policy_destroy(policy);
773}
774
775static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
776{
777 int i;
778 for (i = npols - 1; i >= 0; --i)
779 xfrm_pol_put(pols[i]);
780}
781
782void __xfrm_state_destroy(struct xfrm_state *, bool);
783
784static inline void __xfrm_state_put(struct xfrm_state *x)
785{
786 refcount_dec(&x->refcnt);
787}
788
789static inline void xfrm_state_put(struct xfrm_state *x)
790{
791 if (refcount_dec_and_test(&x->refcnt))
792 __xfrm_state_destroy(x, false);
793}
794
795static inline void xfrm_state_put_sync(struct xfrm_state *x)
796{
797 if (refcount_dec_and_test(&x->refcnt))
798 __xfrm_state_destroy(x, true);
799}
800
801static inline void xfrm_state_hold(struct xfrm_state *x)
802{
803 refcount_inc(&x->refcnt);
804}
805
806static inline bool addr_match(const void *token1, const void *token2,
807 unsigned int prefixlen)
808{
809 const __be32 *a1 = token1;
810 const __be32 *a2 = token2;
811 unsigned int pdw;
812 unsigned int pbi;
813
814 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
815 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
816
817 if (pdw)
818 if (memcmp(a1, a2, pdw << 2))
819 return false;
820
821 if (pbi) {
822 __be32 mask;
823
824 mask = htonl((0xffffffff) << (32 - pbi));
825
826 if ((a1[pdw] ^ a2[pdw]) & mask)
827 return false;
828 }
829
830 return true;
831}
832
833static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
834{
835 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
836 if (sizeof(long) == 4 && prefixlen == 0)
837 return true;
838 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
839}
840
841static __inline__
842__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
843{
844 __be16 port;
845 switch(fl->flowi_proto) {
846 case IPPROTO_TCP:
847 case IPPROTO_UDP:
848 case IPPROTO_UDPLITE:
849 case IPPROTO_SCTP:
850 port = uli->ports.sport;
851 break;
852 case IPPROTO_ICMP:
853 case IPPROTO_ICMPV6:
854 port = htons(uli->icmpt.type);
855 break;
856 case IPPROTO_MH:
857 port = htons(uli->mht.type);
858 break;
859 case IPPROTO_GRE:
860 port = htons(ntohl(uli->gre_key) >> 16);
861 break;
862 default:
863 port = 0; /*XXX*/
864 }
865 return port;
866}
867
868static __inline__
869__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
870{
871 __be16 port;
872 switch(fl->flowi_proto) {
873 case IPPROTO_TCP:
874 case IPPROTO_UDP:
875 case IPPROTO_UDPLITE:
876 case IPPROTO_SCTP:
877 port = uli->ports.dport;
878 break;
879 case IPPROTO_ICMP:
880 case IPPROTO_ICMPV6:
881 port = htons(uli->icmpt.code);
882 break;
883 case IPPROTO_GRE:
884 port = htons(ntohl(uli->gre_key) & 0xffff);
885 break;
886 default:
887 port = 0; /*XXX*/
888 }
889 return port;
890}
891
892bool xfrm_selector_match(const struct xfrm_selector *sel,
893 const struct flowi *fl, unsigned short family);
894
895#ifdef CONFIG_SECURITY_NETWORK_XFRM
896/* If neither has a context --> match
897 * Otherwise, both must have a context and the sids, doi, alg must match
898 */
899static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
900{
901 return ((!s1 && !s2) ||
902 (s1 && s2 &&
903 (s1->ctx_sid == s2->ctx_sid) &&
904 (s1->ctx_doi == s2->ctx_doi) &&
905 (s1->ctx_alg == s2->ctx_alg)));
906}
907#else
908static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
909{
910 return true;
911}
912#endif
913
914/* A struct encoding bundle of transformations to apply to some set of flow.
915 *
916 * xdst->child points to the next element of bundle.
917 * dst->xfrm points to an instanse of transformer.
918 *
919 * Due to unfortunate limitations of current routing cache, which we
920 * have no time to fix, it mirrors struct rtable and bound to the same
921 * routing key, including saddr,daddr. However, we can have many of
922 * bundles differing by session id. All the bundles grow from a parent
923 * policy rule.
924 */
925struct xfrm_dst {
926 union {
927 struct dst_entry dst;
928 struct rtable rt;
929 struct rt6_info rt6;
930 } u;
931 struct dst_entry *route;
932 struct dst_entry *child;
933 struct dst_entry *path;
934 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
935 int num_pols, num_xfrms;
936 u32 xfrm_genid;
937 u32 policy_genid;
938 u32 route_mtu_cached;
939 u32 child_mtu_cached;
940 u32 route_cookie;
941 u32 path_cookie;
942};
943
944static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
945{
946#ifdef CONFIG_XFRM
947 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
948 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
949
950 return xdst->path;
951 }
952#endif
953 return (struct dst_entry *) dst;
954}
955
956static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
957{
958#ifdef CONFIG_XFRM
959 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
960 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
961 return xdst->child;
962 }
963#endif
964 return NULL;
965}
966
967#ifdef CONFIG_XFRM
968static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
969{
970 xdst->child = child;
971}
972
973static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
974{
975 xfrm_pols_put(xdst->pols, xdst->num_pols);
976 dst_release(xdst->route);
977 if (likely(xdst->u.dst.xfrm))
978 xfrm_state_put(xdst->u.dst.xfrm);
979}
980#endif
981
982void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
983
984struct xfrm_if_parms {
985 int link; /* ifindex of underlying L2 interface */
986 u32 if_id; /* interface identifyer */
987};
988
989struct xfrm_if {
990 struct xfrm_if __rcu *next; /* next interface in list */
991 struct net_device *dev; /* virtual device associated with interface */
992 struct net *net; /* netns for packet i/o */
993 struct xfrm_if_parms p; /* interface parms */
994
995 struct gro_cells gro_cells;
996};
997
998struct xfrm_offload {
999 /* Output sequence number for replay protection on offloading. */
1000 struct {
1001 __u32 low;
1002 __u32 hi;
1003 } seq;
1004
1005 __u32 flags;
1006#define SA_DELETE_REQ 1
1007#define CRYPTO_DONE 2
1008#define CRYPTO_NEXT_DONE 4
1009#define CRYPTO_FALLBACK 8
1010#define XFRM_GSO_SEGMENT 16
1011#define XFRM_GRO 32
1012#define XFRM_ESP_NO_TRAILER 64
1013#define XFRM_DEV_RESUME 128
1014#define XFRM_XMIT 256
1015
1016 __u32 status;
1017#define CRYPTO_SUCCESS 1
1018#define CRYPTO_GENERIC_ERROR 2
1019#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1020#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1021#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1022#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1023#define CRYPTO_INVALID_PACKET_SYNTAX 64
1024#define CRYPTO_INVALID_PROTOCOL 128
1025
1026 __u8 proto;
1027};
1028
1029struct sec_path {
1030 int len;
1031 int olen;
1032
1033 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1034 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1035};
1036
1037struct sec_path *secpath_set(struct sk_buff *skb);
1038
1039static inline void
1040secpath_reset(struct sk_buff *skb)
1041{
1042#ifdef CONFIG_XFRM
1043 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1044#endif
1045}
1046
1047static inline int
1048xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1049{
1050 switch (family) {
1051 case AF_INET:
1052 return addr->a4 == 0;
1053 case AF_INET6:
1054 return ipv6_addr_any(&addr->in6);
1055 }
1056 return 0;
1057}
1058
1059static inline int
1060__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1061{
1062 return (tmpl->saddr.a4 &&
1063 tmpl->saddr.a4 != x->props.saddr.a4);
1064}
1065
1066static inline int
1067__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1068{
1069 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1070 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1071}
1072
1073static inline int
1074xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1075{
1076 switch (family) {
1077 case AF_INET:
1078 return __xfrm4_state_addr_cmp(tmpl, x);
1079 case AF_INET6:
1080 return __xfrm6_state_addr_cmp(tmpl, x);
1081 }
1082 return !0;
1083}
1084
1085#ifdef CONFIG_XFRM
1086int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1087 unsigned short family);
1088
1089static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1090 struct sk_buff *skb,
1091 unsigned int family, int reverse)
1092{
1093 struct net *net = dev_net(skb->dev);
1094 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1095
1096 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1097 return __xfrm_policy_check(sk, ndir, skb, family);
1098
1099 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1100 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1101 __xfrm_policy_check(sk, ndir, skb, family);
1102}
1103
1104static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1105{
1106 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1107}
1108
1109static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1110{
1111 return xfrm_policy_check(sk, dir, skb, AF_INET);
1112}
1113
1114static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1115{
1116 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1117}
1118
1119static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1120 struct sk_buff *skb)
1121{
1122 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1123}
1124
1125static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1126 struct sk_buff *skb)
1127{
1128 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1129}
1130
1131int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1132 unsigned int family, int reverse);
1133
1134static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1135 unsigned int family)
1136{
1137 return __xfrm_decode_session(skb, fl, family, 0);
1138}
1139
1140static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1141 struct flowi *fl,
1142 unsigned int family)
1143{
1144 return __xfrm_decode_session(skb, fl, family, 1);
1145}
1146
1147int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1148
1149static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1150{
1151 struct net *net = dev_net(skb->dev);
1152
1153 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1154 (skb_dst(skb)->flags & DST_NOXFRM) ||
1155 __xfrm_route_forward(skb, family);
1156}
1157
1158static inline int xfrm4_route_forward(struct sk_buff *skb)
1159{
1160 return xfrm_route_forward(skb, AF_INET);
1161}
1162
1163static inline int xfrm6_route_forward(struct sk_buff *skb)
1164{
1165 return xfrm_route_forward(skb, AF_INET6);
1166}
1167
1168int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1169
1170static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1171{
1172 sk->sk_policy[0] = NULL;
1173 sk->sk_policy[1] = NULL;
1174 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1175 return __xfrm_sk_clone_policy(sk, osk);
1176 return 0;
1177}
1178
1179int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1180
1181static inline void xfrm_sk_free_policy(struct sock *sk)
1182{
1183 struct xfrm_policy *pol;
1184
1185 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1186 if (unlikely(pol != NULL)) {
1187 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1188 sk->sk_policy[0] = NULL;
1189 }
1190 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1191 if (unlikely(pol != NULL)) {
1192 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1193 sk->sk_policy[1] = NULL;
1194 }
1195}
1196
1197#else
1198
1199static inline void xfrm_sk_free_policy(struct sock *sk) {}
1200static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1201static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1202static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1203static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1204{
1205 return 1;
1206}
1207static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1208{
1209 return 1;
1210}
1211static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1212{
1213 return 1;
1214}
1215static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1216 struct flowi *fl,
1217 unsigned int family)
1218{
1219 return -ENOSYS;
1220}
1221static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1222 struct sk_buff *skb)
1223{
1224 return 1;
1225}
1226static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1227 struct sk_buff *skb)
1228{
1229 return 1;
1230}
1231#endif
1232
1233static __inline__
1234xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1235{
1236 switch (family){
1237 case AF_INET:
1238 return (xfrm_address_t *)&fl->u.ip4.daddr;
1239 case AF_INET6:
1240 return (xfrm_address_t *)&fl->u.ip6.daddr;
1241 }
1242 return NULL;
1243}
1244
1245static __inline__
1246xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1247{
1248 switch (family){
1249 case AF_INET:
1250 return (xfrm_address_t *)&fl->u.ip4.saddr;
1251 case AF_INET6:
1252 return (xfrm_address_t *)&fl->u.ip6.saddr;
1253 }
1254 return NULL;
1255}
1256
1257static __inline__
1258void xfrm_flowi_addr_get(const struct flowi *fl,
1259 xfrm_address_t *saddr, xfrm_address_t *daddr,
1260 unsigned short family)
1261{
1262 switch(family) {
1263 case AF_INET:
1264 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1265 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1266 break;
1267 case AF_INET6:
1268 saddr->in6 = fl->u.ip6.saddr;
1269 daddr->in6 = fl->u.ip6.daddr;
1270 break;
1271 }
1272}
1273
1274static __inline__ int
1275__xfrm4_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277{
1278 if (daddr->a4 == x->id.daddr.a4 &&
1279 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1280 return 1;
1281 return 0;
1282}
1283
1284static __inline__ int
1285__xfrm6_state_addr_check(const struct xfrm_state *x,
1286 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1287{
1288 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1289 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1290 ipv6_addr_any((struct in6_addr *)saddr) ||
1291 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1292 return 1;
1293 return 0;
1294}
1295
1296static __inline__ int
1297xfrm_state_addr_check(const struct xfrm_state *x,
1298 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1299 unsigned short family)
1300{
1301 switch (family) {
1302 case AF_INET:
1303 return __xfrm4_state_addr_check(x, daddr, saddr);
1304 case AF_INET6:
1305 return __xfrm6_state_addr_check(x, daddr, saddr);
1306 }
1307 return 0;
1308}
1309
1310static __inline__ int
1311xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1312 unsigned short family)
1313{
1314 switch (family) {
1315 case AF_INET:
1316 return __xfrm4_state_addr_check(x,
1317 (const xfrm_address_t *)&fl->u.ip4.daddr,
1318 (const xfrm_address_t *)&fl->u.ip4.saddr);
1319 case AF_INET6:
1320 return __xfrm6_state_addr_check(x,
1321 (const xfrm_address_t *)&fl->u.ip6.daddr,
1322 (const xfrm_address_t *)&fl->u.ip6.saddr);
1323 }
1324 return 0;
1325}
1326
1327static inline int xfrm_state_kern(const struct xfrm_state *x)
1328{
1329 return atomic_read(&x->tunnel_users);
1330}
1331
1332static inline bool xfrm_id_proto_valid(u8 proto)
1333{
1334 switch (proto) {
1335 case IPPROTO_AH:
1336 case IPPROTO_ESP:
1337 case IPPROTO_COMP:
1338#if IS_ENABLED(CONFIG_IPV6)
1339 case IPPROTO_ROUTING:
1340 case IPPROTO_DSTOPTS:
1341#endif
1342 return true;
1343 default:
1344 return false;
1345 }
1346}
1347
1348/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1349static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1350{
1351 return (!userproto || proto == userproto ||
1352 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1353 proto == IPPROTO_ESP ||
1354 proto == IPPROTO_COMP)));
1355}
1356
1357/*
1358 * xfrm algorithm information
1359 */
1360struct xfrm_algo_aead_info {
1361 char *geniv;
1362 u16 icv_truncbits;
1363};
1364
1365struct xfrm_algo_auth_info {
1366 u16 icv_truncbits;
1367 u16 icv_fullbits;
1368};
1369
1370struct xfrm_algo_encr_info {
1371 char *geniv;
1372 u16 blockbits;
1373 u16 defkeybits;
1374};
1375
1376struct xfrm_algo_comp_info {
1377 u16 threshold;
1378};
1379
1380struct xfrm_algo_desc {
1381 char *name;
1382 char *compat;
1383 u8 available:1;
1384 u8 pfkey_supported:1;
1385 union {
1386 struct xfrm_algo_aead_info aead;
1387 struct xfrm_algo_auth_info auth;
1388 struct xfrm_algo_encr_info encr;
1389 struct xfrm_algo_comp_info comp;
1390 } uinfo;
1391 struct sadb_alg desc;
1392};
1393
1394/* XFRM protocol handlers. */
1395struct xfrm4_protocol {
1396 int (*handler)(struct sk_buff *skb);
1397 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1398 int encap_type);
1399 int (*cb_handler)(struct sk_buff *skb, int err);
1400 int (*err_handler)(struct sk_buff *skb, u32 info);
1401
1402 struct xfrm4_protocol __rcu *next;
1403 int priority;
1404};
1405
1406struct xfrm6_protocol {
1407 int (*handler)(struct sk_buff *skb);
1408 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1409 int encap_type);
1410 int (*cb_handler)(struct sk_buff *skb, int err);
1411 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1412 u8 type, u8 code, int offset, __be32 info);
1413
1414 struct xfrm6_protocol __rcu *next;
1415 int priority;
1416};
1417
1418/* XFRM tunnel handlers. */
1419struct xfrm_tunnel {
1420 int (*handler)(struct sk_buff *skb);
1421 int (*cb_handler)(struct sk_buff *skb, int err);
1422 int (*err_handler)(struct sk_buff *skb, u32 info);
1423
1424 struct xfrm_tunnel __rcu *next;
1425 int priority;
1426};
1427
1428struct xfrm6_tunnel {
1429 int (*handler)(struct sk_buff *skb);
1430 int (*cb_handler)(struct sk_buff *skb, int err);
1431 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1432 u8 type, u8 code, int offset, __be32 info);
1433 struct xfrm6_tunnel __rcu *next;
1434 int priority;
1435};
1436
1437void xfrm_init(void);
1438void xfrm4_init(void);
1439int xfrm_state_init(struct net *net);
1440void xfrm_state_fini(struct net *net);
1441void xfrm4_state_init(void);
1442void xfrm4_protocol_init(void);
1443#ifdef CONFIG_XFRM
1444int xfrm6_init(void);
1445void xfrm6_fini(void);
1446int xfrm6_state_init(void);
1447void xfrm6_state_fini(void);
1448int xfrm6_protocol_init(void);
1449void xfrm6_protocol_fini(void);
1450#else
1451static inline int xfrm6_init(void)
1452{
1453 return 0;
1454}
1455static inline void xfrm6_fini(void)
1456{
1457 ;
1458}
1459#endif
1460
1461#ifdef CONFIG_XFRM_STATISTICS
1462int xfrm_proc_init(struct net *net);
1463void xfrm_proc_fini(struct net *net);
1464#endif
1465
1466int xfrm_sysctl_init(struct net *net);
1467#ifdef CONFIG_SYSCTL
1468void xfrm_sysctl_fini(struct net *net);
1469#else
1470static inline void xfrm_sysctl_fini(struct net *net)
1471{
1472}
1473#endif
1474
1475void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1476 struct xfrm_address_filter *filter);
1477int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1478 int (*func)(struct xfrm_state *, int, void*), void *);
1479void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1480struct xfrm_state *xfrm_state_alloc(struct net *net);
1481void xfrm_state_free(struct xfrm_state *x);
1482struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1483 const xfrm_address_t *saddr,
1484 const struct flowi *fl,
1485 struct xfrm_tmpl *tmpl,
1486 struct xfrm_policy *pol, int *err,
1487 unsigned short family, u32 if_id);
1488struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1489 xfrm_address_t *daddr,
1490 xfrm_address_t *saddr,
1491 unsigned short family,
1492 u8 mode, u8 proto, u32 reqid);
1493struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1494 unsigned short family);
1495int xfrm_state_check_expire(struct xfrm_state *x);
1496void xfrm_state_insert(struct xfrm_state *x);
1497int xfrm_state_add(struct xfrm_state *x);
1498int xfrm_state_update(struct xfrm_state *x);
1499struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1500 const xfrm_address_t *daddr, __be32 spi,
1501 u8 proto, unsigned short family);
1502struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1503 const xfrm_address_t *daddr,
1504 const xfrm_address_t *saddr,
1505 u8 proto,
1506 unsigned short family);
1507#ifdef CONFIG_XFRM_SUB_POLICY
1508void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1509 unsigned short family);
1510void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1511 unsigned short family);
1512#else
1513static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1514 int n, unsigned short family)
1515{
1516}
1517
1518static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1519 int n, unsigned short family)
1520{
1521}
1522#endif
1523
1524struct xfrmk_sadinfo {
1525 u32 sadhcnt; /* current hash bkts */
1526 u32 sadhmcnt; /* max allowed hash bkts */
1527 u32 sadcnt; /* current running count */
1528};
1529
1530struct xfrmk_spdinfo {
1531 u32 incnt;
1532 u32 outcnt;
1533 u32 fwdcnt;
1534 u32 inscnt;
1535 u32 outscnt;
1536 u32 fwdscnt;
1537 u32 spdhcnt;
1538 u32 spdhmcnt;
1539};
1540
1541struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1542int xfrm_state_delete(struct xfrm_state *x);
1543int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1544int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1545void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1546void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1547u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1548int xfrm_init_replay(struct xfrm_state *x);
1549u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1550int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1551int xfrm_init_state(struct xfrm_state *x);
1552int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1553int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1554int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1555 int (*finish)(struct net *, struct sock *,
1556 struct sk_buff *));
1557int xfrm_trans_queue(struct sk_buff *skb,
1558 int (*finish)(struct net *, struct sock *,
1559 struct sk_buff *));
1560int xfrm_output_resume(struct sk_buff *skb, int err);
1561int xfrm_output(struct sock *sk, struct sk_buff *skb);
1562
1563#if IS_ENABLED(CONFIG_NET_PKTGEN)
1564int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1565#endif
1566
1567void xfrm_local_error(struct sk_buff *skb, int mtu);
1568int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1569int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1570 int encap_type);
1571int xfrm4_transport_finish(struct sk_buff *skb, int async);
1572int xfrm4_rcv(struct sk_buff *skb);
1573int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1574
1575static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1576{
1577 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1578 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1579 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1580 return xfrm_input(skb, nexthdr, spi, 0);
1581}
1582
1583int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1584int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1585int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1586int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1587int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1588int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1589void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1590int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1591int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1592 struct ip6_tnl *t);
1593int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1594 int encap_type);
1595int xfrm6_transport_finish(struct sk_buff *skb, int async);
1596int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1597int xfrm6_rcv(struct sk_buff *skb);
1598int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1599 xfrm_address_t *saddr, u8 proto);
1600void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1601int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1602int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1603int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1604int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1605__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1606__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1607int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1608int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1609int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1610 u8 **prevhdr);
1611
1612#ifdef CONFIG_XFRM
1613void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1614int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1615int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1616int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1617 int optlen);
1618#else
1619static inline int xfrm_user_policy(struct sock *sk, int optname,
1620 sockptr_t optval, int optlen)
1621{
1622 return -ENOPROTOOPT;
1623}
1624#endif
1625
1626struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1627 const xfrm_address_t *saddr,
1628 const xfrm_address_t *daddr,
1629 int family, u32 mark);
1630
1631struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1632
1633void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1634int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1635 int (*func)(struct xfrm_policy *, int, int, void*),
1636 void *);
1637void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1638int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1639struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1640 const struct xfrm_mark *mark,
1641 u32 if_id, u8 type, int dir,
1642 struct xfrm_selector *sel,
1643 struct xfrm_sec_ctx *ctx, int delete,
1644 int *err);
1645struct xfrm_policy *xfrm_policy_byid(struct net *net,
1646 const struct xfrm_mark *mark, u32 if_id,
1647 u8 type, int dir, u32 id, int delete,
1648 int *err);
1649int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1650void xfrm_policy_hash_rebuild(struct net *net);
1651u32 xfrm_get_acqseq(void);
1652int verify_spi_info(u8 proto, u32 min, u32 max);
1653int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1654struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1655 u8 mode, u32 reqid, u32 if_id, u8 proto,
1656 const xfrm_address_t *daddr,
1657 const xfrm_address_t *saddr, int create,
1658 unsigned short family);
1659int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1660
1661#ifdef CONFIG_XFRM_MIGRATE
1662int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1663 const struct xfrm_migrate *m, int num_bundles,
1664 const struct xfrm_kmaddress *k,
1665 const struct xfrm_encap_tmpl *encap);
1666struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1667struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1668 struct xfrm_migrate *m,
1669 struct xfrm_encap_tmpl *encap);
1670int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1671 struct xfrm_migrate *m, int num_bundles,
1672 struct xfrm_kmaddress *k, struct net *net,
1673 struct xfrm_encap_tmpl *encap);
1674#endif
1675
1676int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1677void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1678int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1679 xfrm_address_t *addr);
1680
1681void xfrm_input_init(void);
1682int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1683
1684void xfrm_probe_algs(void);
1685int xfrm_count_pfkey_auth_supported(void);
1686int xfrm_count_pfkey_enc_supported(void);
1687struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1688struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1689struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1690struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1691struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1692struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1693struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1694struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1695struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1696 int probe);
1697
1698static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1699 const xfrm_address_t *b)
1700{
1701 return ipv6_addr_equal((const struct in6_addr *)a,
1702 (const struct in6_addr *)b);
1703}
1704
1705static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1706 const xfrm_address_t *b,
1707 sa_family_t family)
1708{
1709 switch (family) {
1710 default:
1711 case AF_INET:
1712 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1713 case AF_INET6:
1714 return xfrm6_addr_equal(a, b);
1715 }
1716}
1717
1718static inline int xfrm_policy_id2dir(u32 index)
1719{
1720 return index & 7;
1721}
1722
1723#ifdef CONFIG_XFRM
1724static inline int xfrm_aevent_is_on(struct net *net)
1725{
1726 struct sock *nlsk;
1727 int ret = 0;
1728
1729 rcu_read_lock();
1730 nlsk = rcu_dereference(net->xfrm.nlsk);
1731 if (nlsk)
1732 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1733 rcu_read_unlock();
1734 return ret;
1735}
1736
1737static inline int xfrm_acquire_is_on(struct net *net)
1738{
1739 struct sock *nlsk;
1740 int ret = 0;
1741
1742 rcu_read_lock();
1743 nlsk = rcu_dereference(net->xfrm.nlsk);
1744 if (nlsk)
1745 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1746 rcu_read_unlock();
1747
1748 return ret;
1749}
1750#endif
1751
1752static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1753{
1754 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1755}
1756
1757static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1758{
1759 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1760}
1761
1762static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1763{
1764 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1765}
1766
1767static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1768{
1769 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1770}
1771
1772#ifdef CONFIG_XFRM_MIGRATE
1773static inline int xfrm_replay_clone(struct xfrm_state *x,
1774 struct xfrm_state *orig)
1775{
1776
1777 x->replay_esn = kmemdup(orig->replay_esn,
1778 xfrm_replay_state_esn_len(orig->replay_esn),
1779 GFP_KERNEL);
1780 if (!x->replay_esn)
1781 return -ENOMEM;
1782 x->preplay_esn = kmemdup(orig->preplay_esn,
1783 xfrm_replay_state_esn_len(orig->preplay_esn),
1784 GFP_KERNEL);
1785 if (!x->preplay_esn)
1786 return -ENOMEM;
1787
1788 return 0;
1789}
1790
1791static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1792{
1793 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1794}
1795
1796
1797static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1798{
1799 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1800}
1801
1802static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1803{
1804 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1805}
1806
1807static inline void xfrm_states_put(struct xfrm_state **states, int n)
1808{
1809 int i;
1810 for (i = 0; i < n; i++)
1811 xfrm_state_put(*(states + i));
1812}
1813
1814static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1815{
1816 int i;
1817 for (i = 0; i < n; i++)
1818 xfrm_state_delete(*(states + i));
1819}
1820#endif
1821
1822#ifdef CONFIG_XFRM
1823static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1824{
1825 struct sec_path *sp = skb_sec_path(skb);
1826
1827 return sp->xvec[sp->len - 1];
1828}
1829#endif
1830
1831static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1832{
1833#ifdef CONFIG_XFRM
1834 struct sec_path *sp = skb_sec_path(skb);
1835
1836 if (!sp || !sp->olen || sp->len != sp->olen)
1837 return NULL;
1838
1839 return &sp->ovec[sp->olen - 1];
1840#else
1841 return NULL;
1842#endif
1843}
1844
1845void __init xfrm_dev_init(void);
1846
1847#ifdef CONFIG_XFRM_OFFLOAD
1848void xfrm_dev_resume(struct sk_buff *skb);
1849void xfrm_dev_backlog(struct softnet_data *sd);
1850struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1851int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1852 struct xfrm_user_offload *xuo);
1853bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1854
1855static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1856{
1857 struct xfrm_state_offload *xso = &x->xso;
1858
1859 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1860 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1861}
1862
1863static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1864{
1865 struct xfrm_state *x = dst->xfrm;
1866 struct xfrm_dst *xdst;
1867
1868 if (!x || !x->type_offload)
1869 return false;
1870
1871 xdst = (struct xfrm_dst *) dst;
1872 if (!x->xso.offload_handle && !xdst->child->xfrm)
1873 return true;
1874 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1875 !xdst->child->xfrm)
1876 return true;
1877
1878 return false;
1879}
1880
1881static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1882{
1883 struct xfrm_state_offload *xso = &x->xso;
1884
1885 if (xso->dev)
1886 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1887}
1888
1889static inline void xfrm_dev_state_free(struct xfrm_state *x)
1890{
1891 struct xfrm_state_offload *xso = &x->xso;
1892 struct net_device *dev = xso->dev;
1893
1894 if (dev && dev->xfrmdev_ops) {
1895 if (dev->xfrmdev_ops->xdo_dev_state_free)
1896 dev->xfrmdev_ops->xdo_dev_state_free(x);
1897 xso->dev = NULL;
1898 dev_put(dev);
1899 }
1900}
1901#else
1902static inline void xfrm_dev_resume(struct sk_buff *skb)
1903{
1904}
1905
1906static inline void xfrm_dev_backlog(struct softnet_data *sd)
1907{
1908}
1909
1910static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1911{
1912 return skb;
1913}
1914
1915static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1916{
1917 return 0;
1918}
1919
1920static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1921{
1922}
1923
1924static inline void xfrm_dev_state_free(struct xfrm_state *x)
1925{
1926}
1927
1928static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1929{
1930 return false;
1931}
1932
1933static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1934{
1935}
1936
1937static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1938{
1939 return false;
1940}
1941#endif
1942
1943static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1944{
1945 if (attrs[XFRMA_MARK])
1946 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1947 else
1948 m->v = m->m = 0;
1949
1950 return m->v & m->m;
1951}
1952
1953static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1954{
1955 int ret = 0;
1956
1957 if (m->m | m->v)
1958 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1959 return ret;
1960}
1961
1962static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1963{
1964 struct xfrm_mark *m = &x->props.smark;
1965
1966 return (m->v & m->m) | (mark & ~m->m);
1967}
1968
1969static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1970{
1971 int ret = 0;
1972
1973 if (if_id)
1974 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1975 return ret;
1976}
1977
1978static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1979 unsigned int family)
1980{
1981 bool tunnel = false;
1982
1983 switch(family) {
1984 case AF_INET:
1985 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1986 tunnel = true;
1987 break;
1988 case AF_INET6:
1989 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1990 tunnel = true;
1991 break;
1992 }
1993 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1994 return -EINVAL;
1995
1996 return 0;
1997}
1998
1999#if IS_ENABLED(CONFIG_IPV6)
2000static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2001{
2002 int proto;
2003
2004 if (!sk || sk->sk_family != AF_INET6)
2005 return false;
2006
2007 proto = sk->sk_protocol;
2008 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2009 return inet6_sk(sk)->dontfrag;
2010
2011 return false;
2012}
2013#endif
2014#endif /* _NET_XFRM_H */