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1#ifndef _NET_XFRM_H
2#define _NET_XFRM_H
3
4#include <linux/compiler.h>
5#include <linux/xfrm.h>
6#include <linux/spinlock.h>
7#include <linux/list.h>
8#include <linux/skbuff.h>
9#include <linux/socket.h>
10#include <linux/pfkeyv2.h>
11#include <linux/ipsec.h>
12#include <linux/in6.h>
13#include <linux/mutex.h>
14#include <linux/audit.h>
15#include <linux/slab.h>
16
17#include <net/sock.h>
18#include <net/dst.h>
19#include <net/ip.h>
20#include <net/route.h>
21#include <net/ipv6.h>
22#include <net/ip6_fib.h>
23#include <net/flow.h>
24
25#include <linux/interrupt.h>
26
27#ifdef CONFIG_XFRM_STATISTICS
28#include <net/snmp.h>
29#endif
30
31#define XFRM_PROTO_ESP 50
32#define XFRM_PROTO_AH 51
33#define XFRM_PROTO_COMP 108
34#define XFRM_PROTO_IPIP 4
35#define XFRM_PROTO_IPV6 41
36#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41#define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46#ifdef CONFIG_XFRM_STATISTICS
47#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48#define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49#define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50#else
51#define XFRM_INC_STATS(net, field) ((void)(net))
52#define XFRM_INC_STATS_BH(net, field) ((void)(net))
53#define XFRM_INC_STATS_USER(net, field) ((void)(net))
54#endif
55
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
127/* Full description of state of transformer. */
128struct xfrm_state {
129#ifdef CONFIG_NET_NS
130 struct net *xs_net;
131#endif
132 union {
133 struct hlist_node gclist;
134 struct hlist_node bydst;
135 };
136 struct hlist_node bysrc;
137 struct hlist_node byspi;
138
139 atomic_t refcnt;
140 spinlock_t lock;
141
142 struct xfrm_id id;
143 struct xfrm_selector sel;
144 struct xfrm_mark mark;
145 u32 tfcpad;
146
147 u32 genid;
148
149 /* Key manager bits */
150 struct xfrm_state_walk km;
151
152 /* Parameters of this state. */
153 struct {
154 u32 reqid;
155 u8 mode;
156 u8 replay_window;
157 u8 aalgo, ealgo, calgo;
158 u8 flags;
159 u16 family;
160 xfrm_address_t saddr;
161 int header_len;
162 int trailer_len;
163 u32 extra_flags;
164 } props;
165
166 struct xfrm_lifetime_cfg lft;
167
168 /* Data for transformer */
169 struct xfrm_algo_auth *aalg;
170 struct xfrm_algo *ealg;
171 struct xfrm_algo *calg;
172 struct xfrm_algo_aead *aead;
173
174 /* Data for encapsulator */
175 struct xfrm_encap_tmpl *encap;
176
177 /* Data for care-of address */
178 xfrm_address_t *coaddr;
179
180 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
181 struct xfrm_state *tunnel;
182
183 /* If a tunnel, number of users + 1 */
184 atomic_t tunnel_users;
185
186 /* State for replay detection */
187 struct xfrm_replay_state replay;
188 struct xfrm_replay_state_esn *replay_esn;
189
190 /* Replay detection state at the time we sent the last notification */
191 struct xfrm_replay_state preplay;
192 struct xfrm_replay_state_esn *preplay_esn;
193
194 /* The functions for replay detection. */
195 struct xfrm_replay *repl;
196
197 /* internal flag that only holds state for delayed aevent at the
198 * moment
199 */
200 u32 xflags;
201
202 /* Replay detection notification settings */
203 u32 replay_maxage;
204 u32 replay_maxdiff;
205
206 /* Replay detection notification timer */
207 struct timer_list rtimer;
208
209 /* Statistics */
210 struct xfrm_stats stats;
211
212 struct xfrm_lifetime_cur curlft;
213 struct tasklet_hrtimer mtimer;
214
215 /* used to fix curlft->add_time when changing date */
216 long saved_tmo;
217
218 /* Last used time */
219 unsigned long lastused;
220
221 /* Reference to data common to all the instances of this
222 * transformer. */
223 const struct xfrm_type *type;
224 struct xfrm_mode *inner_mode;
225 struct xfrm_mode *inner_mode_iaf;
226 struct xfrm_mode *outer_mode;
227
228 /* Security context */
229 struct xfrm_sec_ctx *security;
230
231 /* Private data of this transformer, format is opaque,
232 * interpreted by xfrm_type methods. */
233 void *data;
234};
235
236static inline struct net *xs_net(struct xfrm_state *x)
237{
238 return read_pnet(&x->xs_net);
239}
240
241/* xflags - make enum if more show up */
242#define XFRM_TIME_DEFER 1
243#define XFRM_SOFT_EXPIRE 2
244
245enum {
246 XFRM_STATE_VOID,
247 XFRM_STATE_ACQ,
248 XFRM_STATE_VALID,
249 XFRM_STATE_ERROR,
250 XFRM_STATE_EXPIRED,
251 XFRM_STATE_DEAD
252};
253
254/* callback structure passed from either netlink or pfkey */
255struct km_event {
256 union {
257 u32 hard;
258 u32 proto;
259 u32 byid;
260 u32 aevent;
261 u32 type;
262 } data;
263
264 u32 seq;
265 u32 portid;
266 u32 event;
267 struct net *net;
268};
269
270struct xfrm_replay {
271 void (*advance)(struct xfrm_state *x, __be32 net_seq);
272 int (*check)(struct xfrm_state *x,
273 struct sk_buff *skb,
274 __be32 net_seq);
275 int (*recheck)(struct xfrm_state *x,
276 struct sk_buff *skb,
277 __be32 net_seq);
278 void (*notify)(struct xfrm_state *x, int event);
279 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
280};
281
282struct net_device;
283struct xfrm_type;
284struct xfrm_dst;
285struct xfrm_policy_afinfo {
286 unsigned short family;
287 struct dst_ops *dst_ops;
288 void (*garbage_collect)(struct net *net);
289 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
290 const xfrm_address_t *saddr,
291 const xfrm_address_t *daddr);
292 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
293 void (*decode_session)(struct sk_buff *skb,
294 struct flowi *fl,
295 int reverse);
296 int (*get_tos)(const struct flowi *fl);
297 void (*init_dst)(struct net *net,
298 struct xfrm_dst *dst);
299 int (*init_path)(struct xfrm_dst *path,
300 struct dst_entry *dst,
301 int nfheader_len);
302 int (*fill_dst)(struct xfrm_dst *xdst,
303 struct net_device *dev,
304 const struct flowi *fl);
305 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
306};
307
308int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
309int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
310void km_policy_notify(struct xfrm_policy *xp, int dir,
311 const struct km_event *c);
312void km_state_notify(struct xfrm_state *x, const struct km_event *c);
313
314struct xfrm_tmpl;
315int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
316 struct xfrm_policy *pol);
317void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
318int __xfrm_state_delete(struct xfrm_state *x);
319
320struct xfrm_state_afinfo {
321 unsigned int family;
322 unsigned int proto;
323 __be16 eth_proto;
324 struct module *owner;
325 const struct xfrm_type *type_map[IPPROTO_MAX];
326 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
327 int (*init_flags)(struct xfrm_state *x);
328 void (*init_tempsel)(struct xfrm_selector *sel,
329 const struct flowi *fl);
330 void (*init_temprop)(struct xfrm_state *x,
331 const struct xfrm_tmpl *tmpl,
332 const xfrm_address_t *daddr,
333 const xfrm_address_t *saddr);
334 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
335 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
336 int (*output)(struct sock *sk, struct sk_buff *skb);
337 int (*output_finish)(struct sk_buff *skb);
338 int (*extract_input)(struct xfrm_state *x,
339 struct sk_buff *skb);
340 int (*extract_output)(struct xfrm_state *x,
341 struct sk_buff *skb);
342 int (*transport_finish)(struct sk_buff *skb,
343 int async);
344 void (*local_error)(struct sk_buff *skb, u32 mtu);
345};
346
347int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
348int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
349struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
350void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
351
352struct xfrm_input_afinfo {
353 unsigned int family;
354 struct module *owner;
355 int (*callback)(struct sk_buff *skb, u8 protocol,
356 int err);
357};
358
359int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
360int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
361
362void xfrm_state_delete_tunnel(struct xfrm_state *x);
363
364struct xfrm_type {
365 char *description;
366 struct module *owner;
367 u8 proto;
368 u8 flags;
369#define XFRM_TYPE_NON_FRAGMENT 1
370#define XFRM_TYPE_REPLAY_PROT 2
371#define XFRM_TYPE_LOCAL_COADDR 4
372#define XFRM_TYPE_REMOTE_COADDR 8
373
374 int (*init_state)(struct xfrm_state *x);
375 void (*destructor)(struct xfrm_state *);
376 int (*input)(struct xfrm_state *, struct sk_buff *skb);
377 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
378 int (*reject)(struct xfrm_state *, struct sk_buff *,
379 const struct flowi *);
380 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
381 /* Estimate maximal size of result of transformation of a dgram */
382 u32 (*get_mtu)(struct xfrm_state *, int size);
383};
384
385int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
386int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
387
388struct xfrm_mode {
389 /*
390 * Remove encapsulation header.
391 *
392 * The IP header will be moved over the top of the encapsulation
393 * header.
394 *
395 * On entry, the transport header shall point to where the IP header
396 * should be and the network header shall be set to where the IP
397 * header currently is. skb->data shall point to the start of the
398 * payload.
399 */
400 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
401
402 /*
403 * This is the actual input entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * input2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to the tunnel encapsulation function
408 * xfrm4_prepare_input that would in turn call input2.
409 */
410 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
411
412 /*
413 * Add encapsulation header.
414 *
415 * On exit, the transport header will be set to the start of the
416 * encapsulation header to be filled in by x->type->output and
417 * the mac header will be set to the nextheader (protocol for
418 * IPv4) field of the extension header directly preceding the
419 * encapsulation header, or in its absence, that of the top IP
420 * header. The value of the network header will always point
421 * to the top IP header while skb->data will point to the payload.
422 */
423 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
424
425 /*
426 * This is the actual output entry point.
427 *
428 * For transport mode and equivalent this would be identical to
429 * output2 (which does not need to be set). While tunnel mode
430 * and equivalent would set this to a tunnel encapsulation function
431 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
432 * call output2.
433 */
434 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
435
436 struct xfrm_state_afinfo *afinfo;
437 struct module *owner;
438 unsigned int encap;
439 int flags;
440};
441
442/* Flags for xfrm_mode. */
443enum {
444 XFRM_MODE_FLAG_TUNNEL = 1,
445};
446
447int xfrm_register_mode(struct xfrm_mode *mode, int family);
448int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
449
450static inline int xfrm_af2proto(unsigned int family)
451{
452 switch(family) {
453 case AF_INET:
454 return IPPROTO_IPIP;
455 case AF_INET6:
456 return IPPROTO_IPV6;
457 default:
458 return 0;
459 }
460}
461
462static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
463{
464 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
465 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
466 return x->inner_mode;
467 else
468 return x->inner_mode_iaf;
469}
470
471struct xfrm_tmpl {
472/* id in template is interpreted as:
473 * daddr - destination of tunnel, may be zero for transport mode.
474 * spi - zero to acquire spi. Not zero if spi is static, then
475 * daddr must be fixed too.
476 * proto - AH/ESP/IPCOMP
477 */
478 struct xfrm_id id;
479
480/* Source address of tunnel. Ignored, if it is not a tunnel. */
481 xfrm_address_t saddr;
482
483 unsigned short encap_family;
484
485 u32 reqid;
486
487/* Mode: transport, tunnel etc. */
488 u8 mode;
489
490/* Sharing mode: unique, this session only, this user only etc. */
491 u8 share;
492
493/* May skip this transfomration if no SA is found */
494 u8 optional;
495
496/* Skip aalgos/ealgos/calgos checks. */
497 u8 allalgs;
498
499/* Bit mask of algos allowed for acquisition */
500 u32 aalgos;
501 u32 ealgos;
502 u32 calgos;
503};
504
505#define XFRM_MAX_DEPTH 6
506
507struct xfrm_policy_walk_entry {
508 struct list_head all;
509 u8 dead;
510};
511
512struct xfrm_policy_walk {
513 struct xfrm_policy_walk_entry walk;
514 u8 type;
515 u32 seq;
516};
517
518struct xfrm_policy_queue {
519 struct sk_buff_head hold_queue;
520 struct timer_list hold_timer;
521 unsigned long timeout;
522};
523
524struct xfrm_policy {
525#ifdef CONFIG_NET_NS
526 struct net *xp_net;
527#endif
528 struct hlist_node bydst;
529 struct hlist_node byidx;
530
531 /* This lock only affects elements except for entry. */
532 rwlock_t lock;
533 atomic_t refcnt;
534 struct timer_list timer;
535
536 struct flow_cache_object flo;
537 atomic_t genid;
538 u32 priority;
539 u32 index;
540 struct xfrm_mark mark;
541 struct xfrm_selector selector;
542 struct xfrm_lifetime_cfg lft;
543 struct xfrm_lifetime_cur curlft;
544 struct xfrm_policy_walk_entry walk;
545 struct xfrm_policy_queue polq;
546 u8 type;
547 u8 action;
548 u8 flags;
549 u8 xfrm_nr;
550 u16 family;
551 struct xfrm_sec_ctx *security;
552 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
553};
554
555static inline struct net *xp_net(const struct xfrm_policy *xp)
556{
557 return read_pnet(&xp->xp_net);
558}
559
560struct xfrm_kmaddress {
561 xfrm_address_t local;
562 xfrm_address_t remote;
563 u32 reserved;
564 u16 family;
565};
566
567struct xfrm_migrate {
568 xfrm_address_t old_daddr;
569 xfrm_address_t old_saddr;
570 xfrm_address_t new_daddr;
571 xfrm_address_t new_saddr;
572 u8 proto;
573 u8 mode;
574 u16 reserved;
575 u32 reqid;
576 u16 old_family;
577 u16 new_family;
578};
579
580#define XFRM_KM_TIMEOUT 30
581/* what happened */
582#define XFRM_REPLAY_UPDATE XFRM_AE_CR
583#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
584
585/* default aevent timeout in units of 100ms */
586#define XFRM_AE_ETIME 10
587/* Async Event timer multiplier */
588#define XFRM_AE_ETH_M 10
589/* default seq threshold size */
590#define XFRM_AE_SEQT_SIZE 2
591
592struct xfrm_mgr {
593 struct list_head list;
594 char *id;
595 int (*notify)(struct xfrm_state *x, const struct km_event *c);
596 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
597 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
598 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
599 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
600 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
601 int (*migrate)(const struct xfrm_selector *sel,
602 u8 dir, u8 type,
603 const struct xfrm_migrate *m,
604 int num_bundles,
605 const struct xfrm_kmaddress *k);
606 bool (*is_alive)(const struct km_event *c);
607};
608
609int xfrm_register_km(struct xfrm_mgr *km);
610int xfrm_unregister_km(struct xfrm_mgr *km);
611
612struct xfrm_tunnel_skb_cb {
613 union {
614 struct inet_skb_parm h4;
615 struct inet6_skb_parm h6;
616 } header;
617
618 union {
619 struct ip_tunnel *ip4;
620 struct ip6_tnl *ip6;
621 } tunnel;
622};
623
624#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
625
626/*
627 * This structure is used for the duration where packets are being
628 * transformed by IPsec. As soon as the packet leaves IPsec the
629 * area beyond the generic IP part may be overwritten.
630 */
631struct xfrm_skb_cb {
632 struct xfrm_tunnel_skb_cb header;
633
634 /* Sequence number for replay protection. */
635 union {
636 struct {
637 __u32 low;
638 __u32 hi;
639 } output;
640 struct {
641 __be32 low;
642 __be32 hi;
643 } input;
644 } seq;
645};
646
647#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
648
649/*
650 * This structure is used by the afinfo prepare_input/prepare_output functions
651 * to transmit header information to the mode input/output functions.
652 */
653struct xfrm_mode_skb_cb {
654 struct xfrm_tunnel_skb_cb header;
655
656 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
657 __be16 id;
658 __be16 frag_off;
659
660 /* IP header length (excluding options or extension headers). */
661 u8 ihl;
662
663 /* TOS for IPv4, class for IPv6. */
664 u8 tos;
665
666 /* TTL for IPv4, hop limitfor IPv6. */
667 u8 ttl;
668
669 /* Protocol for IPv4, NH for IPv6. */
670 u8 protocol;
671
672 /* Option length for IPv4, zero for IPv6. */
673 u8 optlen;
674
675 /* Used by IPv6 only, zero for IPv4. */
676 u8 flow_lbl[3];
677};
678
679#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
680
681/*
682 * This structure is used by the input processing to locate the SPI and
683 * related information.
684 */
685struct xfrm_spi_skb_cb {
686 struct xfrm_tunnel_skb_cb header;
687
688 unsigned int daddroff;
689 unsigned int family;
690};
691
692#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
693
694/* Audit Information */
695struct xfrm_audit {
696 u32 secid;
697 kuid_t loginuid;
698 unsigned int sessionid;
699};
700
701#ifdef CONFIG_AUDITSYSCALL
702static inline struct audit_buffer *xfrm_audit_start(const char *op)
703{
704 struct audit_buffer *audit_buf = NULL;
705
706 if (audit_enabled == 0)
707 return NULL;
708 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
709 AUDIT_MAC_IPSEC_EVENT);
710 if (audit_buf == NULL)
711 return NULL;
712 audit_log_format(audit_buf, "op=%s", op);
713 return audit_buf;
714}
715
716static inline void xfrm_audit_helper_usrinfo(kuid_t auid, unsigned int ses, u32 secid,
717 struct audit_buffer *audit_buf)
718{
719 char *secctx;
720 u32 secctx_len;
721
722 audit_log_format(audit_buf, " auid=%u ses=%u",
723 from_kuid(&init_user_ns, auid), ses);
724 if (secid != 0 &&
725 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
726 audit_log_format(audit_buf, " subj=%s", secctx);
727 security_release_secctx(secctx, secctx_len);
728 } else
729 audit_log_task_context(audit_buf);
730}
731
732void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, kuid_t auid,
733 unsigned int ses, u32 secid);
734void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, kuid_t auid,
735 unsigned int ses, u32 secid);
736void xfrm_audit_state_add(struct xfrm_state *x, int result, kuid_t auid,
737 unsigned int ses, u32 secid);
738void xfrm_audit_state_delete(struct xfrm_state *x, int result, kuid_t auid,
739 unsigned int ses, u32 secid);
740void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
741 struct sk_buff *skb);
742void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
743 __be32 net_seq);
744void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
745void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
746 __be32 net_seq);
747void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
748 u8 proto);
749#else
750
751static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
752 kuid_t auid, unsigned int ses, u32 secid)
753{
754}
755
756static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
757 kuid_t auid, unsigned int ses, u32 secid)
758{
759}
760
761static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
762 kuid_t auid, unsigned int ses, u32 secid)
763{
764}
765
766static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
767 kuid_t auid, unsigned int ses, u32 secid)
768{
769}
770
771static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
772 struct sk_buff *skb)
773{
774}
775
776static inline void xfrm_audit_state_replay(struct xfrm_state *x,
777 struct sk_buff *skb, __be32 net_seq)
778{
779}
780
781static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
782 u16 family)
783{
784}
785
786static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
787 __be32 net_spi, __be32 net_seq)
788{
789}
790
791static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
792 struct sk_buff *skb, u8 proto)
793{
794}
795#endif /* CONFIG_AUDITSYSCALL */
796
797static inline void xfrm_pol_hold(struct xfrm_policy *policy)
798{
799 if (likely(policy != NULL))
800 atomic_inc(&policy->refcnt);
801}
802
803void xfrm_policy_destroy(struct xfrm_policy *policy);
804
805static inline void xfrm_pol_put(struct xfrm_policy *policy)
806{
807 if (atomic_dec_and_test(&policy->refcnt))
808 xfrm_policy_destroy(policy);
809}
810
811static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
812{
813 int i;
814 for (i = npols - 1; i >= 0; --i)
815 xfrm_pol_put(pols[i]);
816}
817
818void __xfrm_state_destroy(struct xfrm_state *);
819
820static inline void __xfrm_state_put(struct xfrm_state *x)
821{
822 atomic_dec(&x->refcnt);
823}
824
825static inline void xfrm_state_put(struct xfrm_state *x)
826{
827 if (atomic_dec_and_test(&x->refcnt))
828 __xfrm_state_destroy(x);
829}
830
831static inline void xfrm_state_hold(struct xfrm_state *x)
832{
833 atomic_inc(&x->refcnt);
834}
835
836static inline bool addr_match(const void *token1, const void *token2,
837 int prefixlen)
838{
839 const __be32 *a1 = token1;
840 const __be32 *a2 = token2;
841 int pdw;
842 int pbi;
843
844 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
845 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
846
847 if (pdw)
848 if (memcmp(a1, a2, pdw << 2))
849 return false;
850
851 if (pbi) {
852 __be32 mask;
853
854 mask = htonl((0xffffffff) << (32 - pbi));
855
856 if ((a1[pdw] ^ a2[pdw]) & mask)
857 return false;
858 }
859
860 return true;
861}
862
863static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
864{
865 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
866 if (prefixlen == 0)
867 return true;
868 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
869}
870
871static __inline__
872__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
873{
874 __be16 port;
875 switch(fl->flowi_proto) {
876 case IPPROTO_TCP:
877 case IPPROTO_UDP:
878 case IPPROTO_UDPLITE:
879 case IPPROTO_SCTP:
880 port = uli->ports.sport;
881 break;
882 case IPPROTO_ICMP:
883 case IPPROTO_ICMPV6:
884 port = htons(uli->icmpt.type);
885 break;
886 case IPPROTO_MH:
887 port = htons(uli->mht.type);
888 break;
889 case IPPROTO_GRE:
890 port = htons(ntohl(uli->gre_key) >> 16);
891 break;
892 default:
893 port = 0; /*XXX*/
894 }
895 return port;
896}
897
898static __inline__
899__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
900{
901 __be16 port;
902 switch(fl->flowi_proto) {
903 case IPPROTO_TCP:
904 case IPPROTO_UDP:
905 case IPPROTO_UDPLITE:
906 case IPPROTO_SCTP:
907 port = uli->ports.dport;
908 break;
909 case IPPROTO_ICMP:
910 case IPPROTO_ICMPV6:
911 port = htons(uli->icmpt.code);
912 break;
913 case IPPROTO_GRE:
914 port = htons(ntohl(uli->gre_key) & 0xffff);
915 break;
916 default:
917 port = 0; /*XXX*/
918 }
919 return port;
920}
921
922bool xfrm_selector_match(const struct xfrm_selector *sel,
923 const struct flowi *fl, unsigned short family);
924
925#ifdef CONFIG_SECURITY_NETWORK_XFRM
926/* If neither has a context --> match
927 * Otherwise, both must have a context and the sids, doi, alg must match
928 */
929static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
930{
931 return ((!s1 && !s2) ||
932 (s1 && s2 &&
933 (s1->ctx_sid == s2->ctx_sid) &&
934 (s1->ctx_doi == s2->ctx_doi) &&
935 (s1->ctx_alg == s2->ctx_alg)));
936}
937#else
938static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
939{
940 return true;
941}
942#endif
943
944/* A struct encoding bundle of transformations to apply to some set of flow.
945 *
946 * dst->child points to the next element of bundle.
947 * dst->xfrm points to an instanse of transformer.
948 *
949 * Due to unfortunate limitations of current routing cache, which we
950 * have no time to fix, it mirrors struct rtable and bound to the same
951 * routing key, including saddr,daddr. However, we can have many of
952 * bundles differing by session id. All the bundles grow from a parent
953 * policy rule.
954 */
955struct xfrm_dst {
956 union {
957 struct dst_entry dst;
958 struct rtable rt;
959 struct rt6_info rt6;
960 } u;
961 struct dst_entry *route;
962 struct flow_cache_object flo;
963 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
964 int num_pols, num_xfrms;
965#ifdef CONFIG_XFRM_SUB_POLICY
966 struct flowi *origin;
967 struct xfrm_selector *partner;
968#endif
969 u32 xfrm_genid;
970 u32 policy_genid;
971 u32 route_mtu_cached;
972 u32 child_mtu_cached;
973 u32 route_cookie;
974 u32 path_cookie;
975};
976
977#ifdef CONFIG_XFRM
978static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
979{
980 xfrm_pols_put(xdst->pols, xdst->num_pols);
981 dst_release(xdst->route);
982 if (likely(xdst->u.dst.xfrm))
983 xfrm_state_put(xdst->u.dst.xfrm);
984#ifdef CONFIG_XFRM_SUB_POLICY
985 kfree(xdst->origin);
986 xdst->origin = NULL;
987 kfree(xdst->partner);
988 xdst->partner = NULL;
989#endif
990}
991#endif
992
993void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
994
995struct sec_path {
996 atomic_t refcnt;
997 int len;
998 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
999};
1000
1001static inline int secpath_exists(struct sk_buff *skb)
1002{
1003#ifdef CONFIG_XFRM
1004 return skb->sp != NULL;
1005#else
1006 return 0;
1007#endif
1008}
1009
1010static inline struct sec_path *
1011secpath_get(struct sec_path *sp)
1012{
1013 if (sp)
1014 atomic_inc(&sp->refcnt);
1015 return sp;
1016}
1017
1018void __secpath_destroy(struct sec_path *sp);
1019
1020static inline void
1021secpath_put(struct sec_path *sp)
1022{
1023 if (sp && atomic_dec_and_test(&sp->refcnt))
1024 __secpath_destroy(sp);
1025}
1026
1027struct sec_path *secpath_dup(struct sec_path *src);
1028
1029static inline void
1030secpath_reset(struct sk_buff *skb)
1031{
1032#ifdef CONFIG_XFRM
1033 secpath_put(skb->sp);
1034 skb->sp = NULL;
1035#endif
1036}
1037
1038static inline int
1039xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1040{
1041 switch (family) {
1042 case AF_INET:
1043 return addr->a4 == 0;
1044 case AF_INET6:
1045 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1046 }
1047 return 0;
1048}
1049
1050static inline int
1051__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1052{
1053 return (tmpl->saddr.a4 &&
1054 tmpl->saddr.a4 != x->props.saddr.a4);
1055}
1056
1057static inline int
1058__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1059{
1060 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1061 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1062}
1063
1064static inline int
1065xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1066{
1067 switch (family) {
1068 case AF_INET:
1069 return __xfrm4_state_addr_cmp(tmpl, x);
1070 case AF_INET6:
1071 return __xfrm6_state_addr_cmp(tmpl, x);
1072 }
1073 return !0;
1074}
1075
1076#ifdef CONFIG_XFRM
1077int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1078 unsigned short family);
1079
1080static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1081 struct sk_buff *skb,
1082 unsigned int family, int reverse)
1083{
1084 struct net *net = dev_net(skb->dev);
1085 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1086
1087 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1088 return __xfrm_policy_check(sk, ndir, skb, family);
1089
1090 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1091 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1092 __xfrm_policy_check(sk, ndir, skb, family);
1093}
1094
1095static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1096{
1097 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1098}
1099
1100static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1101{
1102 return xfrm_policy_check(sk, dir, skb, AF_INET);
1103}
1104
1105static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1106{
1107 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1108}
1109
1110static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1111 struct sk_buff *skb)
1112{
1113 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1114}
1115
1116static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1117 struct sk_buff *skb)
1118{
1119 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1120}
1121
1122int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1123 unsigned int family, int reverse);
1124
1125static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1126 unsigned int family)
1127{
1128 return __xfrm_decode_session(skb, fl, family, 0);
1129}
1130
1131static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1132 struct flowi *fl,
1133 unsigned int family)
1134{
1135 return __xfrm_decode_session(skb, fl, family, 1);
1136}
1137
1138int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1139
1140static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1141{
1142 struct net *net = dev_net(skb->dev);
1143
1144 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1145 (skb_dst(skb)->flags & DST_NOXFRM) ||
1146 __xfrm_route_forward(skb, family);
1147}
1148
1149static inline int xfrm4_route_forward(struct sk_buff *skb)
1150{
1151 return xfrm_route_forward(skb, AF_INET);
1152}
1153
1154static inline int xfrm6_route_forward(struct sk_buff *skb)
1155{
1156 return xfrm_route_forward(skb, AF_INET6);
1157}
1158
1159int __xfrm_sk_clone_policy(struct sock *sk);
1160
1161static inline int xfrm_sk_clone_policy(struct sock *sk)
1162{
1163 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1164 return __xfrm_sk_clone_policy(sk);
1165 return 0;
1166}
1167
1168int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1169
1170static inline void xfrm_sk_free_policy(struct sock *sk)
1171{
1172 if (unlikely(sk->sk_policy[0] != NULL)) {
1173 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1174 sk->sk_policy[0] = NULL;
1175 }
1176 if (unlikely(sk->sk_policy[1] != NULL)) {
1177 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1178 sk->sk_policy[1] = NULL;
1179 }
1180}
1181
1182void xfrm_garbage_collect(struct net *net);
1183
1184#else
1185
1186static inline void xfrm_sk_free_policy(struct sock *sk) {}
1187static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1188static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1189static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1190static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1191{
1192 return 1;
1193}
1194static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1195{
1196 return 1;
1197}
1198static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1199{
1200 return 1;
1201}
1202static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1203 struct flowi *fl,
1204 unsigned int family)
1205{
1206 return -ENOSYS;
1207}
1208static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1209 struct sk_buff *skb)
1210{
1211 return 1;
1212}
1213static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1214 struct sk_buff *skb)
1215{
1216 return 1;
1217}
1218static inline void xfrm_garbage_collect(struct net *net)
1219{
1220}
1221#endif
1222
1223static __inline__
1224xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1225{
1226 switch (family){
1227 case AF_INET:
1228 return (xfrm_address_t *)&fl->u.ip4.daddr;
1229 case AF_INET6:
1230 return (xfrm_address_t *)&fl->u.ip6.daddr;
1231 }
1232 return NULL;
1233}
1234
1235static __inline__
1236xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1237{
1238 switch (family){
1239 case AF_INET:
1240 return (xfrm_address_t *)&fl->u.ip4.saddr;
1241 case AF_INET6:
1242 return (xfrm_address_t *)&fl->u.ip6.saddr;
1243 }
1244 return NULL;
1245}
1246
1247static __inline__
1248void xfrm_flowi_addr_get(const struct flowi *fl,
1249 xfrm_address_t *saddr, xfrm_address_t *daddr,
1250 unsigned short family)
1251{
1252 switch(family) {
1253 case AF_INET:
1254 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1255 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1256 break;
1257 case AF_INET6:
1258 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1259 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1260 break;
1261 }
1262}
1263
1264static __inline__ int
1265__xfrm4_state_addr_check(const struct xfrm_state *x,
1266 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1267{
1268 if (daddr->a4 == x->id.daddr.a4 &&
1269 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1270 return 1;
1271 return 0;
1272}
1273
1274static __inline__ int
1275__xfrm6_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277{
1278 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1279 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1280 ipv6_addr_any((struct in6_addr *)saddr) ||
1281 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1282 return 1;
1283 return 0;
1284}
1285
1286static __inline__ int
1287xfrm_state_addr_check(const struct xfrm_state *x,
1288 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1289 unsigned short family)
1290{
1291 switch (family) {
1292 case AF_INET:
1293 return __xfrm4_state_addr_check(x, daddr, saddr);
1294 case AF_INET6:
1295 return __xfrm6_state_addr_check(x, daddr, saddr);
1296 }
1297 return 0;
1298}
1299
1300static __inline__ int
1301xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1302 unsigned short family)
1303{
1304 switch (family) {
1305 case AF_INET:
1306 return __xfrm4_state_addr_check(x,
1307 (const xfrm_address_t *)&fl->u.ip4.daddr,
1308 (const xfrm_address_t *)&fl->u.ip4.saddr);
1309 case AF_INET6:
1310 return __xfrm6_state_addr_check(x,
1311 (const xfrm_address_t *)&fl->u.ip6.daddr,
1312 (const xfrm_address_t *)&fl->u.ip6.saddr);
1313 }
1314 return 0;
1315}
1316
1317static inline int xfrm_state_kern(const struct xfrm_state *x)
1318{
1319 return atomic_read(&x->tunnel_users);
1320}
1321
1322static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1323{
1324 return (!userproto || proto == userproto ||
1325 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1326 proto == IPPROTO_ESP ||
1327 proto == IPPROTO_COMP)));
1328}
1329
1330/*
1331 * xfrm algorithm information
1332 */
1333struct xfrm_algo_aead_info {
1334 u16 icv_truncbits;
1335};
1336
1337struct xfrm_algo_auth_info {
1338 u16 icv_truncbits;
1339 u16 icv_fullbits;
1340};
1341
1342struct xfrm_algo_encr_info {
1343 u16 blockbits;
1344 u16 defkeybits;
1345};
1346
1347struct xfrm_algo_comp_info {
1348 u16 threshold;
1349};
1350
1351struct xfrm_algo_desc {
1352 char *name;
1353 char *compat;
1354 u8 available:1;
1355 u8 pfkey_supported:1;
1356 union {
1357 struct xfrm_algo_aead_info aead;
1358 struct xfrm_algo_auth_info auth;
1359 struct xfrm_algo_encr_info encr;
1360 struct xfrm_algo_comp_info comp;
1361 } uinfo;
1362 struct sadb_alg desc;
1363};
1364
1365/* XFRM protocol handlers. */
1366struct xfrm4_protocol {
1367 int (*handler)(struct sk_buff *skb);
1368 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1369 int encap_type);
1370 int (*cb_handler)(struct sk_buff *skb, int err);
1371 int (*err_handler)(struct sk_buff *skb, u32 info);
1372
1373 struct xfrm4_protocol __rcu *next;
1374 int priority;
1375};
1376
1377struct xfrm6_protocol {
1378 int (*handler)(struct sk_buff *skb);
1379 int (*cb_handler)(struct sk_buff *skb, int err);
1380 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1381 u8 type, u8 code, int offset, __be32 info);
1382
1383 struct xfrm6_protocol __rcu *next;
1384 int priority;
1385};
1386
1387/* XFRM tunnel handlers. */
1388struct xfrm_tunnel {
1389 int (*handler)(struct sk_buff *skb);
1390 int (*err_handler)(struct sk_buff *skb, u32 info);
1391
1392 struct xfrm_tunnel __rcu *next;
1393 int priority;
1394};
1395
1396struct xfrm6_tunnel {
1397 int (*handler)(struct sk_buff *skb);
1398 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1399 u8 type, u8 code, int offset, __be32 info);
1400 struct xfrm6_tunnel __rcu *next;
1401 int priority;
1402};
1403
1404void xfrm_init(void);
1405void xfrm4_init(void);
1406int xfrm_state_init(struct net *net);
1407void xfrm_state_fini(struct net *net);
1408void xfrm4_state_init(void);
1409void xfrm4_protocol_init(void);
1410#ifdef CONFIG_XFRM
1411int xfrm6_init(void);
1412void xfrm6_fini(void);
1413int xfrm6_state_init(void);
1414void xfrm6_state_fini(void);
1415int xfrm6_protocol_init(void);
1416void xfrm6_protocol_fini(void);
1417#else
1418static inline int xfrm6_init(void)
1419{
1420 return 0;
1421}
1422static inline void xfrm6_fini(void)
1423{
1424 ;
1425}
1426#endif
1427
1428#ifdef CONFIG_XFRM_STATISTICS
1429int xfrm_proc_init(struct net *net);
1430void xfrm_proc_fini(struct net *net);
1431#endif
1432
1433int xfrm_sysctl_init(struct net *net);
1434#ifdef CONFIG_SYSCTL
1435void xfrm_sysctl_fini(struct net *net);
1436#else
1437static inline void xfrm_sysctl_fini(struct net *net)
1438{
1439}
1440#endif
1441
1442void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1443 struct xfrm_address_filter *filter);
1444int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1445 int (*func)(struct xfrm_state *, int, void*), void *);
1446void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1447struct xfrm_state *xfrm_state_alloc(struct net *net);
1448struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1449 const xfrm_address_t *saddr,
1450 const struct flowi *fl,
1451 struct xfrm_tmpl *tmpl,
1452 struct xfrm_policy *pol, int *err,
1453 unsigned short family);
1454struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1455 xfrm_address_t *daddr,
1456 xfrm_address_t *saddr,
1457 unsigned short family,
1458 u8 mode, u8 proto, u32 reqid);
1459struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1460 unsigned short family);
1461int xfrm_state_check_expire(struct xfrm_state *x);
1462void xfrm_state_insert(struct xfrm_state *x);
1463int xfrm_state_add(struct xfrm_state *x);
1464int xfrm_state_update(struct xfrm_state *x);
1465struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1466 const xfrm_address_t *daddr, __be32 spi,
1467 u8 proto, unsigned short family);
1468struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1469 const xfrm_address_t *daddr,
1470 const xfrm_address_t *saddr,
1471 u8 proto,
1472 unsigned short family);
1473#ifdef CONFIG_XFRM_SUB_POLICY
1474int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1475 unsigned short family, struct net *net);
1476int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1477 unsigned short family);
1478#else
1479static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1480 int n, unsigned short family, struct net *net)
1481{
1482 return -ENOSYS;
1483}
1484
1485static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1486 int n, unsigned short family)
1487{
1488 return -ENOSYS;
1489}
1490#endif
1491
1492struct xfrmk_sadinfo {
1493 u32 sadhcnt; /* current hash bkts */
1494 u32 sadhmcnt; /* max allowed hash bkts */
1495 u32 sadcnt; /* current running count */
1496};
1497
1498struct xfrmk_spdinfo {
1499 u32 incnt;
1500 u32 outcnt;
1501 u32 fwdcnt;
1502 u32 inscnt;
1503 u32 outscnt;
1504 u32 fwdscnt;
1505 u32 spdhcnt;
1506 u32 spdhmcnt;
1507};
1508
1509struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1510int xfrm_state_delete(struct xfrm_state *x);
1511int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1512void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1513void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1514u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1515int xfrm_init_replay(struct xfrm_state *x);
1516int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1517int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1518int xfrm_init_state(struct xfrm_state *x);
1519int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1520int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1521int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1522int xfrm_output_resume(struct sk_buff *skb, int err);
1523int xfrm_output(struct sk_buff *skb);
1524int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1525void xfrm_local_error(struct sk_buff *skb, int mtu);
1526int xfrm4_extract_header(struct sk_buff *skb);
1527int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1528int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1529 int encap_type);
1530int xfrm4_transport_finish(struct sk_buff *skb, int async);
1531int xfrm4_rcv(struct sk_buff *skb);
1532
1533static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1534{
1535 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1536 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1537 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1538 return xfrm_input(skb, nexthdr, spi, 0);
1539}
1540
1541int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1542int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1543int xfrm4_output(struct sock *sk, struct sk_buff *skb);
1544int xfrm4_output_finish(struct sk_buff *skb);
1545int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1546int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1547int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1548int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1549int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1550void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1551int xfrm6_extract_header(struct sk_buff *skb);
1552int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1553int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1554int xfrm6_transport_finish(struct sk_buff *skb, int async);
1555int xfrm6_rcv(struct sk_buff *skb);
1556int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1557 xfrm_address_t *saddr, u8 proto);
1558void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1559int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1560int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1561int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1562int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1563int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1564__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1565__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1566int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1567int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1568int xfrm6_output(struct sock *sk, struct sk_buff *skb);
1569int xfrm6_output_finish(struct sk_buff *skb);
1570int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1571 u8 **prevhdr);
1572
1573#ifdef CONFIG_XFRM
1574int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1575int xfrm_user_policy(struct sock *sk, int optname,
1576 u8 __user *optval, int optlen);
1577#else
1578static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1579{
1580 return -ENOPROTOOPT;
1581}
1582
1583static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1584{
1585 /* should not happen */
1586 kfree_skb(skb);
1587 return 0;
1588}
1589#endif
1590
1591struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1592
1593void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1594int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1595 int (*func)(struct xfrm_policy *, int, int, void*),
1596 void *);
1597void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1598int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1599struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1600 u8 type, int dir,
1601 struct xfrm_selector *sel,
1602 struct xfrm_sec_ctx *ctx, int delete,
1603 int *err);
1604struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1605 u32 id, int delete, int *err);
1606int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1607u32 xfrm_get_acqseq(void);
1608int verify_spi_info(u8 proto, u32 min, u32 max);
1609int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1610struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1611 u8 mode, u32 reqid, u8 proto,
1612 const xfrm_address_t *daddr,
1613 const xfrm_address_t *saddr, int create,
1614 unsigned short family);
1615int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1616
1617#ifdef CONFIG_XFRM_MIGRATE
1618int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1619 const struct xfrm_migrate *m, int num_bundles,
1620 const struct xfrm_kmaddress *k);
1621struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1622struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1623 struct xfrm_migrate *m);
1624int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1625 struct xfrm_migrate *m, int num_bundles,
1626 struct xfrm_kmaddress *k, struct net *net);
1627#endif
1628
1629int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1630void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1631int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1632 xfrm_address_t *addr);
1633
1634void xfrm_input_init(void);
1635int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1636
1637void xfrm_probe_algs(void);
1638int xfrm_count_pfkey_auth_supported(void);
1639int xfrm_count_pfkey_enc_supported(void);
1640struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1641struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1642struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1643struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1644struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1645struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1646struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1647struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1648struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1649 int probe);
1650
1651static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1652 const xfrm_address_t *b)
1653{
1654 return ipv6_addr_equal((const struct in6_addr *)a,
1655 (const struct in6_addr *)b);
1656}
1657
1658static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1659 const xfrm_address_t *b,
1660 sa_family_t family)
1661{
1662 switch (family) {
1663 default:
1664 case AF_INET:
1665 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1666 case AF_INET6:
1667 return xfrm6_addr_equal(a, b);
1668 }
1669}
1670
1671static inline int xfrm_policy_id2dir(u32 index)
1672{
1673 return index & 7;
1674}
1675
1676#ifdef CONFIG_XFRM
1677static inline int xfrm_aevent_is_on(struct net *net)
1678{
1679 struct sock *nlsk;
1680 int ret = 0;
1681
1682 rcu_read_lock();
1683 nlsk = rcu_dereference(net->xfrm.nlsk);
1684 if (nlsk)
1685 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1686 rcu_read_unlock();
1687 return ret;
1688}
1689
1690static inline int xfrm_acquire_is_on(struct net *net)
1691{
1692 struct sock *nlsk;
1693 int ret = 0;
1694
1695 rcu_read_lock();
1696 nlsk = rcu_dereference(net->xfrm.nlsk);
1697 if (nlsk)
1698 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1699 rcu_read_unlock();
1700
1701 return ret;
1702}
1703#endif
1704
1705static inline int aead_len(struct xfrm_algo_aead *alg)
1706{
1707 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1708}
1709
1710static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1711{
1712 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1713}
1714
1715static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1716{
1717 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1718}
1719
1720static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1721{
1722 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1723}
1724
1725#ifdef CONFIG_XFRM_MIGRATE
1726static inline int xfrm_replay_clone(struct xfrm_state *x,
1727 struct xfrm_state *orig)
1728{
1729 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1730 GFP_KERNEL);
1731 if (!x->replay_esn)
1732 return -ENOMEM;
1733
1734 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1735 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1736
1737 x->preplay_esn = kmemdup(x->replay_esn,
1738 xfrm_replay_state_esn_len(x->replay_esn),
1739 GFP_KERNEL);
1740 if (!x->preplay_esn) {
1741 kfree(x->replay_esn);
1742 return -ENOMEM;
1743 }
1744
1745 return 0;
1746}
1747
1748static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1749{
1750 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1751}
1752
1753
1754static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1755{
1756 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1757}
1758
1759static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1760{
1761 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1762}
1763
1764static inline void xfrm_states_put(struct xfrm_state **states, int n)
1765{
1766 int i;
1767 for (i = 0; i < n; i++)
1768 xfrm_state_put(*(states + i));
1769}
1770
1771static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1772{
1773 int i;
1774 for (i = 0; i < n; i++)
1775 xfrm_state_delete(*(states + i));
1776}
1777#endif
1778
1779#ifdef CONFIG_XFRM
1780static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1781{
1782 return skb->sp->xvec[skb->sp->len - 1];
1783}
1784#endif
1785
1786static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1787{
1788 if (attrs[XFRMA_MARK])
1789 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1790 else
1791 m->v = m->m = 0;
1792
1793 return m->v & m->m;
1794}
1795
1796static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1797{
1798 int ret = 0;
1799
1800 if (m->m | m->v)
1801 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1802 return ret;
1803}
1804
1805static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1806 unsigned int family)
1807{
1808 bool tunnel = false;
1809
1810 switch(family) {
1811 case AF_INET:
1812 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1813 tunnel = true;
1814 break;
1815 case AF_INET6:
1816 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1817 tunnel = true;
1818 break;
1819 }
1820 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1821 return -EINVAL;
1822
1823 return 0;
1824}
1825#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
129enum {
130 XFRM_DEV_OFFLOAD_IN = 1,
131 XFRM_DEV_OFFLOAD_OUT,
132 XFRM_DEV_OFFLOAD_FWD,
133};
134
135enum {
136 XFRM_DEV_OFFLOAD_UNSPECIFIED,
137 XFRM_DEV_OFFLOAD_CRYPTO,
138 XFRM_DEV_OFFLOAD_PACKET,
139};
140
141enum {
142 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
143};
144
145struct xfrm_dev_offload {
146 struct net_device *dev;
147 netdevice_tracker dev_tracker;
148 struct net_device *real_dev;
149 unsigned long offload_handle;
150 u8 dir : 2;
151 u8 type : 2;
152 u8 flags : 2;
153};
154
155struct xfrm_mode {
156 u8 encap;
157 u8 family;
158 u8 flags;
159};
160
161/* Flags for xfrm_mode. */
162enum {
163 XFRM_MODE_FLAG_TUNNEL = 1,
164};
165
166enum xfrm_replay_mode {
167 XFRM_REPLAY_MODE_LEGACY,
168 XFRM_REPLAY_MODE_BMP,
169 XFRM_REPLAY_MODE_ESN,
170};
171
172/* Full description of state of transformer. */
173struct xfrm_state {
174 possible_net_t xs_net;
175 union {
176 struct hlist_node gclist;
177 struct hlist_node bydst;
178 };
179 struct hlist_node bysrc;
180 struct hlist_node byspi;
181 struct hlist_node byseq;
182
183 refcount_t refcnt;
184 spinlock_t lock;
185
186 struct xfrm_id id;
187 struct xfrm_selector sel;
188 struct xfrm_mark mark;
189 u32 if_id;
190 u32 tfcpad;
191
192 u32 genid;
193
194 /* Key manager bits */
195 struct xfrm_state_walk km;
196
197 /* Parameters of this state. */
198 struct {
199 u32 reqid;
200 u8 mode;
201 u8 replay_window;
202 u8 aalgo, ealgo, calgo;
203 u8 flags;
204 u16 family;
205 xfrm_address_t saddr;
206 int header_len;
207 int trailer_len;
208 u32 extra_flags;
209 struct xfrm_mark smark;
210 } props;
211
212 struct xfrm_lifetime_cfg lft;
213
214 /* Data for transformer */
215 struct xfrm_algo_auth *aalg;
216 struct xfrm_algo *ealg;
217 struct xfrm_algo *calg;
218 struct xfrm_algo_aead *aead;
219 const char *geniv;
220
221 /* mapping change rate limiting */
222 __be16 new_mapping_sport;
223 u32 new_mapping; /* seconds */
224 u32 mapping_maxage; /* seconds for input SA */
225
226 /* Data for encapsulator */
227 struct xfrm_encap_tmpl *encap;
228 struct sock __rcu *encap_sk;
229
230 /* Data for care-of address */
231 xfrm_address_t *coaddr;
232
233 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
234 struct xfrm_state *tunnel;
235
236 /* If a tunnel, number of users + 1 */
237 atomic_t tunnel_users;
238
239 /* State for replay detection */
240 struct xfrm_replay_state replay;
241 struct xfrm_replay_state_esn *replay_esn;
242
243 /* Replay detection state at the time we sent the last notification */
244 struct xfrm_replay_state preplay;
245 struct xfrm_replay_state_esn *preplay_esn;
246
247 /* replay detection mode */
248 enum xfrm_replay_mode repl_mode;
249 /* internal flag that only holds state for delayed aevent at the
250 * moment
251 */
252 u32 xflags;
253
254 /* Replay detection notification settings */
255 u32 replay_maxage;
256 u32 replay_maxdiff;
257
258 /* Replay detection notification timer */
259 struct timer_list rtimer;
260
261 /* Statistics */
262 struct xfrm_stats stats;
263
264 struct xfrm_lifetime_cur curlft;
265 struct hrtimer mtimer;
266
267 struct xfrm_dev_offload xso;
268
269 /* used to fix curlft->add_time when changing date */
270 long saved_tmo;
271
272 /* Last used time */
273 time64_t lastused;
274
275 struct page_frag xfrag;
276
277 /* Reference to data common to all the instances of this
278 * transformer. */
279 const struct xfrm_type *type;
280 struct xfrm_mode inner_mode;
281 struct xfrm_mode inner_mode_iaf;
282 struct xfrm_mode outer_mode;
283
284 const struct xfrm_type_offload *type_offload;
285
286 /* Security context */
287 struct xfrm_sec_ctx *security;
288
289 /* Private data of this transformer, format is opaque,
290 * interpreted by xfrm_type methods. */
291 void *data;
292};
293
294static inline struct net *xs_net(struct xfrm_state *x)
295{
296 return read_pnet(&x->xs_net);
297}
298
299/* xflags - make enum if more show up */
300#define XFRM_TIME_DEFER 1
301#define XFRM_SOFT_EXPIRE 2
302
303enum {
304 XFRM_STATE_VOID,
305 XFRM_STATE_ACQ,
306 XFRM_STATE_VALID,
307 XFRM_STATE_ERROR,
308 XFRM_STATE_EXPIRED,
309 XFRM_STATE_DEAD
310};
311
312/* callback structure passed from either netlink or pfkey */
313struct km_event {
314 union {
315 u32 hard;
316 u32 proto;
317 u32 byid;
318 u32 aevent;
319 u32 type;
320 } data;
321
322 u32 seq;
323 u32 portid;
324 u32 event;
325 struct net *net;
326};
327
328struct xfrm_if_decode_session_result {
329 struct net *net;
330 u32 if_id;
331};
332
333struct xfrm_if_cb {
334 bool (*decode_session)(struct sk_buff *skb,
335 unsigned short family,
336 struct xfrm_if_decode_session_result *res);
337};
338
339void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
340void xfrm_if_unregister_cb(void);
341
342struct net_device;
343struct xfrm_type;
344struct xfrm_dst;
345struct xfrm_policy_afinfo {
346 struct dst_ops *dst_ops;
347 struct dst_entry *(*dst_lookup)(struct net *net,
348 int tos, int oif,
349 const xfrm_address_t *saddr,
350 const xfrm_address_t *daddr,
351 u32 mark);
352 int (*get_saddr)(struct net *net, int oif,
353 xfrm_address_t *saddr,
354 xfrm_address_t *daddr,
355 u32 mark);
356 int (*fill_dst)(struct xfrm_dst *xdst,
357 struct net_device *dev,
358 const struct flowi *fl);
359 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
360};
361
362int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
363void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
364void km_policy_notify(struct xfrm_policy *xp, int dir,
365 const struct km_event *c);
366void km_state_notify(struct xfrm_state *x, const struct km_event *c);
367
368struct xfrm_tmpl;
369int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
370 struct xfrm_policy *pol);
371void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
372int __xfrm_state_delete(struct xfrm_state *x);
373
374struct xfrm_state_afinfo {
375 u8 family;
376 u8 proto;
377
378 const struct xfrm_type_offload *type_offload_esp;
379
380 const struct xfrm_type *type_esp;
381 const struct xfrm_type *type_ipip;
382 const struct xfrm_type *type_ipip6;
383 const struct xfrm_type *type_comp;
384 const struct xfrm_type *type_ah;
385 const struct xfrm_type *type_routing;
386 const struct xfrm_type *type_dstopts;
387
388 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
389 int (*transport_finish)(struct sk_buff *skb,
390 int async);
391 void (*local_error)(struct sk_buff *skb, u32 mtu);
392};
393
394int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
395int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
396struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
397struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
398
399struct xfrm_input_afinfo {
400 u8 family;
401 bool is_ipip;
402 int (*callback)(struct sk_buff *skb, u8 protocol,
403 int err);
404};
405
406int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
407int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
408
409void xfrm_flush_gc(void);
410void xfrm_state_delete_tunnel(struct xfrm_state *x);
411
412struct xfrm_type {
413 struct module *owner;
414 u8 proto;
415 u8 flags;
416#define XFRM_TYPE_NON_FRAGMENT 1
417#define XFRM_TYPE_REPLAY_PROT 2
418#define XFRM_TYPE_LOCAL_COADDR 4
419#define XFRM_TYPE_REMOTE_COADDR 8
420
421 int (*init_state)(struct xfrm_state *x,
422 struct netlink_ext_ack *extack);
423 void (*destructor)(struct xfrm_state *);
424 int (*input)(struct xfrm_state *, struct sk_buff *skb);
425 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
426 int (*reject)(struct xfrm_state *, struct sk_buff *,
427 const struct flowi *);
428};
429
430int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
431void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
432
433struct xfrm_type_offload {
434 struct module *owner;
435 u8 proto;
436 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
437 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
438 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
439};
440
441int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
442void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
443
444static inline int xfrm_af2proto(unsigned int family)
445{
446 switch(family) {
447 case AF_INET:
448 return IPPROTO_IPIP;
449 case AF_INET6:
450 return IPPROTO_IPV6;
451 default:
452 return 0;
453 }
454}
455
456static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
457{
458 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
459 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
460 return &x->inner_mode;
461 else
462 return &x->inner_mode_iaf;
463}
464
465struct xfrm_tmpl {
466/* id in template is interpreted as:
467 * daddr - destination of tunnel, may be zero for transport mode.
468 * spi - zero to acquire spi. Not zero if spi is static, then
469 * daddr must be fixed too.
470 * proto - AH/ESP/IPCOMP
471 */
472 struct xfrm_id id;
473
474/* Source address of tunnel. Ignored, if it is not a tunnel. */
475 xfrm_address_t saddr;
476
477 unsigned short encap_family;
478
479 u32 reqid;
480
481/* Mode: transport, tunnel etc. */
482 u8 mode;
483
484/* Sharing mode: unique, this session only, this user only etc. */
485 u8 share;
486
487/* May skip this transfomration if no SA is found */
488 u8 optional;
489
490/* Skip aalgos/ealgos/calgos checks. */
491 u8 allalgs;
492
493/* Bit mask of algos allowed for acquisition */
494 u32 aalgos;
495 u32 ealgos;
496 u32 calgos;
497};
498
499#define XFRM_MAX_DEPTH 6
500#define XFRM_MAX_OFFLOAD_DEPTH 1
501
502struct xfrm_policy_walk_entry {
503 struct list_head all;
504 u8 dead;
505};
506
507struct xfrm_policy_walk {
508 struct xfrm_policy_walk_entry walk;
509 u8 type;
510 u32 seq;
511};
512
513struct xfrm_policy_queue {
514 struct sk_buff_head hold_queue;
515 struct timer_list hold_timer;
516 unsigned long timeout;
517};
518
519struct xfrm_policy {
520 possible_net_t xp_net;
521 struct hlist_node bydst;
522 struct hlist_node byidx;
523
524 /* This lock only affects elements except for entry. */
525 rwlock_t lock;
526 refcount_t refcnt;
527 u32 pos;
528 struct timer_list timer;
529
530 atomic_t genid;
531 u32 priority;
532 u32 index;
533 u32 if_id;
534 struct xfrm_mark mark;
535 struct xfrm_selector selector;
536 struct xfrm_lifetime_cfg lft;
537 struct xfrm_lifetime_cur curlft;
538 struct xfrm_policy_walk_entry walk;
539 struct xfrm_policy_queue polq;
540 bool bydst_reinsert;
541 u8 type;
542 u8 action;
543 u8 flags;
544 u8 xfrm_nr;
545 u16 family;
546 struct xfrm_sec_ctx *security;
547 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
548 struct hlist_node bydst_inexact_list;
549 struct rcu_head rcu;
550
551 struct xfrm_dev_offload xdo;
552};
553
554static inline struct net *xp_net(const struct xfrm_policy *xp)
555{
556 return read_pnet(&xp->xp_net);
557}
558
559struct xfrm_kmaddress {
560 xfrm_address_t local;
561 xfrm_address_t remote;
562 u32 reserved;
563 u16 family;
564};
565
566struct xfrm_migrate {
567 xfrm_address_t old_daddr;
568 xfrm_address_t old_saddr;
569 xfrm_address_t new_daddr;
570 xfrm_address_t new_saddr;
571 u8 proto;
572 u8 mode;
573 u16 reserved;
574 u32 reqid;
575 u16 old_family;
576 u16 new_family;
577};
578
579#define XFRM_KM_TIMEOUT 30
580/* what happened */
581#define XFRM_REPLAY_UPDATE XFRM_AE_CR
582#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
583
584/* default aevent timeout in units of 100ms */
585#define XFRM_AE_ETIME 10
586/* Async Event timer multiplier */
587#define XFRM_AE_ETH_M 10
588/* default seq threshold size */
589#define XFRM_AE_SEQT_SIZE 2
590
591struct xfrm_mgr {
592 struct list_head list;
593 int (*notify)(struct xfrm_state *x, const struct km_event *c);
594 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
595 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
596 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
597 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
598 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
599 int (*migrate)(const struct xfrm_selector *sel,
600 u8 dir, u8 type,
601 const struct xfrm_migrate *m,
602 int num_bundles,
603 const struct xfrm_kmaddress *k,
604 const struct xfrm_encap_tmpl *encap);
605 bool (*is_alive)(const struct km_event *c);
606};
607
608void xfrm_register_km(struct xfrm_mgr *km);
609void xfrm_unregister_km(struct xfrm_mgr *km);
610
611struct xfrm_tunnel_skb_cb {
612 union {
613 struct inet_skb_parm h4;
614 struct inet6_skb_parm h6;
615 } header;
616
617 union {
618 struct ip_tunnel *ip4;
619 struct ip6_tnl *ip6;
620 } tunnel;
621};
622
623#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
624
625/*
626 * This structure is used for the duration where packets are being
627 * transformed by IPsec. As soon as the packet leaves IPsec the
628 * area beyond the generic IP part may be overwritten.
629 */
630struct xfrm_skb_cb {
631 struct xfrm_tunnel_skb_cb header;
632
633 /* Sequence number for replay protection. */
634 union {
635 struct {
636 __u32 low;
637 __u32 hi;
638 } output;
639 struct {
640 __be32 low;
641 __be32 hi;
642 } input;
643 } seq;
644};
645
646#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
647
648/*
649 * This structure is used by the afinfo prepare_input/prepare_output functions
650 * to transmit header information to the mode input/output functions.
651 */
652struct xfrm_mode_skb_cb {
653 struct xfrm_tunnel_skb_cb header;
654
655 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
656 __be16 id;
657 __be16 frag_off;
658
659 /* IP header length (excluding options or extension headers). */
660 u8 ihl;
661
662 /* TOS for IPv4, class for IPv6. */
663 u8 tos;
664
665 /* TTL for IPv4, hop limitfor IPv6. */
666 u8 ttl;
667
668 /* Protocol for IPv4, NH for IPv6. */
669 u8 protocol;
670
671 /* Option length for IPv4, zero for IPv6. */
672 u8 optlen;
673
674 /* Used by IPv6 only, zero for IPv4. */
675 u8 flow_lbl[3];
676};
677
678#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
679
680/*
681 * This structure is used by the input processing to locate the SPI and
682 * related information.
683 */
684struct xfrm_spi_skb_cb {
685 struct xfrm_tunnel_skb_cb header;
686
687 unsigned int daddroff;
688 unsigned int family;
689 __be32 seq;
690};
691
692#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
693
694#ifdef CONFIG_AUDITSYSCALL
695static inline struct audit_buffer *xfrm_audit_start(const char *op)
696{
697 struct audit_buffer *audit_buf = NULL;
698
699 if (audit_enabled == AUDIT_OFF)
700 return NULL;
701 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
702 AUDIT_MAC_IPSEC_EVENT);
703 if (audit_buf == NULL)
704 return NULL;
705 audit_log_format(audit_buf, "op=%s", op);
706 return audit_buf;
707}
708
709static inline void xfrm_audit_helper_usrinfo(bool task_valid,
710 struct audit_buffer *audit_buf)
711{
712 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
713 audit_get_loginuid(current) :
714 INVALID_UID);
715 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
716 AUDIT_SID_UNSET;
717
718 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
719 audit_log_task_context(audit_buf);
720}
721
722void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
723void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
724 bool task_valid);
725void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
726void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
727void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
728 struct sk_buff *skb);
729void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
730 __be32 net_seq);
731void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
732void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
733 __be32 net_seq);
734void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
735 u8 proto);
736#else
737
738static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
739 bool task_valid)
740{
741}
742
743static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
744 bool task_valid)
745{
746}
747
748static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
749 bool task_valid)
750{
751}
752
753static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
754 bool task_valid)
755{
756}
757
758static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
759 struct sk_buff *skb)
760{
761}
762
763static inline void xfrm_audit_state_replay(struct xfrm_state *x,
764 struct sk_buff *skb, __be32 net_seq)
765{
766}
767
768static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
769 u16 family)
770{
771}
772
773static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
774 __be32 net_spi, __be32 net_seq)
775{
776}
777
778static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
779 struct sk_buff *skb, u8 proto)
780{
781}
782#endif /* CONFIG_AUDITSYSCALL */
783
784static inline void xfrm_pol_hold(struct xfrm_policy *policy)
785{
786 if (likely(policy != NULL))
787 refcount_inc(&policy->refcnt);
788}
789
790void xfrm_policy_destroy(struct xfrm_policy *policy);
791
792static inline void xfrm_pol_put(struct xfrm_policy *policy)
793{
794 if (refcount_dec_and_test(&policy->refcnt))
795 xfrm_policy_destroy(policy);
796}
797
798static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
799{
800 int i;
801 for (i = npols - 1; i >= 0; --i)
802 xfrm_pol_put(pols[i]);
803}
804
805void __xfrm_state_destroy(struct xfrm_state *, bool);
806
807static inline void __xfrm_state_put(struct xfrm_state *x)
808{
809 refcount_dec(&x->refcnt);
810}
811
812static inline void xfrm_state_put(struct xfrm_state *x)
813{
814 if (refcount_dec_and_test(&x->refcnt))
815 __xfrm_state_destroy(x, false);
816}
817
818static inline void xfrm_state_put_sync(struct xfrm_state *x)
819{
820 if (refcount_dec_and_test(&x->refcnt))
821 __xfrm_state_destroy(x, true);
822}
823
824static inline void xfrm_state_hold(struct xfrm_state *x)
825{
826 refcount_inc(&x->refcnt);
827}
828
829static inline bool addr_match(const void *token1, const void *token2,
830 unsigned int prefixlen)
831{
832 const __be32 *a1 = token1;
833 const __be32 *a2 = token2;
834 unsigned int pdw;
835 unsigned int pbi;
836
837 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
838 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
839
840 if (pdw)
841 if (memcmp(a1, a2, pdw << 2))
842 return false;
843
844 if (pbi) {
845 __be32 mask;
846
847 mask = htonl((0xffffffff) << (32 - pbi));
848
849 if ((a1[pdw] ^ a2[pdw]) & mask)
850 return false;
851 }
852
853 return true;
854}
855
856static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
857{
858 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
859 if (sizeof(long) == 4 && prefixlen == 0)
860 return true;
861 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
862}
863
864static __inline__
865__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
866{
867 __be16 port;
868 switch(fl->flowi_proto) {
869 case IPPROTO_TCP:
870 case IPPROTO_UDP:
871 case IPPROTO_UDPLITE:
872 case IPPROTO_SCTP:
873 port = uli->ports.sport;
874 break;
875 case IPPROTO_ICMP:
876 case IPPROTO_ICMPV6:
877 port = htons(uli->icmpt.type);
878 break;
879 case IPPROTO_MH:
880 port = htons(uli->mht.type);
881 break;
882 case IPPROTO_GRE:
883 port = htons(ntohl(uli->gre_key) >> 16);
884 break;
885 default:
886 port = 0; /*XXX*/
887 }
888 return port;
889}
890
891static __inline__
892__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
893{
894 __be16 port;
895 switch(fl->flowi_proto) {
896 case IPPROTO_TCP:
897 case IPPROTO_UDP:
898 case IPPROTO_UDPLITE:
899 case IPPROTO_SCTP:
900 port = uli->ports.dport;
901 break;
902 case IPPROTO_ICMP:
903 case IPPROTO_ICMPV6:
904 port = htons(uli->icmpt.code);
905 break;
906 case IPPROTO_GRE:
907 port = htons(ntohl(uli->gre_key) & 0xffff);
908 break;
909 default:
910 port = 0; /*XXX*/
911 }
912 return port;
913}
914
915bool xfrm_selector_match(const struct xfrm_selector *sel,
916 const struct flowi *fl, unsigned short family);
917
918#ifdef CONFIG_SECURITY_NETWORK_XFRM
919/* If neither has a context --> match
920 * Otherwise, both must have a context and the sids, doi, alg must match
921 */
922static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
923{
924 return ((!s1 && !s2) ||
925 (s1 && s2 &&
926 (s1->ctx_sid == s2->ctx_sid) &&
927 (s1->ctx_doi == s2->ctx_doi) &&
928 (s1->ctx_alg == s2->ctx_alg)));
929}
930#else
931static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
932{
933 return true;
934}
935#endif
936
937/* A struct encoding bundle of transformations to apply to some set of flow.
938 *
939 * xdst->child points to the next element of bundle.
940 * dst->xfrm points to an instanse of transformer.
941 *
942 * Due to unfortunate limitations of current routing cache, which we
943 * have no time to fix, it mirrors struct rtable and bound to the same
944 * routing key, including saddr,daddr. However, we can have many of
945 * bundles differing by session id. All the bundles grow from a parent
946 * policy rule.
947 */
948struct xfrm_dst {
949 union {
950 struct dst_entry dst;
951 struct rtable rt;
952 struct rt6_info rt6;
953 } u;
954 struct dst_entry *route;
955 struct dst_entry *child;
956 struct dst_entry *path;
957 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
958 int num_pols, num_xfrms;
959 u32 xfrm_genid;
960 u32 policy_genid;
961 u32 route_mtu_cached;
962 u32 child_mtu_cached;
963 u32 route_cookie;
964 u32 path_cookie;
965};
966
967static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
968{
969#ifdef CONFIG_XFRM
970 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
971 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
972
973 return xdst->path;
974 }
975#endif
976 return (struct dst_entry *) dst;
977}
978
979static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
980{
981#ifdef CONFIG_XFRM
982 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
983 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
984 return xdst->child;
985 }
986#endif
987 return NULL;
988}
989
990#ifdef CONFIG_XFRM
991static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
992{
993 xdst->child = child;
994}
995
996static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
997{
998 xfrm_pols_put(xdst->pols, xdst->num_pols);
999 dst_release(xdst->route);
1000 if (likely(xdst->u.dst.xfrm))
1001 xfrm_state_put(xdst->u.dst.xfrm);
1002}
1003#endif
1004
1005void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1006
1007struct xfrm_if_parms {
1008 int link; /* ifindex of underlying L2 interface */
1009 u32 if_id; /* interface identifyer */
1010 bool collect_md;
1011};
1012
1013struct xfrm_if {
1014 struct xfrm_if __rcu *next; /* next interface in list */
1015 struct net_device *dev; /* virtual device associated with interface */
1016 struct net *net; /* netns for packet i/o */
1017 struct xfrm_if_parms p; /* interface parms */
1018
1019 struct gro_cells gro_cells;
1020};
1021
1022struct xfrm_offload {
1023 /* Output sequence number for replay protection on offloading. */
1024 struct {
1025 __u32 low;
1026 __u32 hi;
1027 } seq;
1028
1029 __u32 flags;
1030#define SA_DELETE_REQ 1
1031#define CRYPTO_DONE 2
1032#define CRYPTO_NEXT_DONE 4
1033#define CRYPTO_FALLBACK 8
1034#define XFRM_GSO_SEGMENT 16
1035#define XFRM_GRO 32
1036/* 64 is free */
1037#define XFRM_DEV_RESUME 128
1038#define XFRM_XMIT 256
1039
1040 __u32 status;
1041#define CRYPTO_SUCCESS 1
1042#define CRYPTO_GENERIC_ERROR 2
1043#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1044#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1045#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1046#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1047#define CRYPTO_INVALID_PACKET_SYNTAX 64
1048#define CRYPTO_INVALID_PROTOCOL 128
1049
1050 __u8 proto;
1051 __u8 inner_ipproto;
1052};
1053
1054struct sec_path {
1055 int len;
1056 int olen;
1057 int verified_cnt;
1058
1059 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1060 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1061};
1062
1063struct sec_path *secpath_set(struct sk_buff *skb);
1064
1065static inline void
1066secpath_reset(struct sk_buff *skb)
1067{
1068#ifdef CONFIG_XFRM
1069 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1070#endif
1071}
1072
1073static inline int
1074xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1075{
1076 switch (family) {
1077 case AF_INET:
1078 return addr->a4 == 0;
1079 case AF_INET6:
1080 return ipv6_addr_any(&addr->in6);
1081 }
1082 return 0;
1083}
1084
1085static inline int
1086__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1087{
1088 return (tmpl->saddr.a4 &&
1089 tmpl->saddr.a4 != x->props.saddr.a4);
1090}
1091
1092static inline int
1093__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1094{
1095 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1096 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1097}
1098
1099static inline int
1100xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1101{
1102 switch (family) {
1103 case AF_INET:
1104 return __xfrm4_state_addr_cmp(tmpl, x);
1105 case AF_INET6:
1106 return __xfrm6_state_addr_cmp(tmpl, x);
1107 }
1108 return !0;
1109}
1110
1111#ifdef CONFIG_XFRM
1112static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1113{
1114 struct sec_path *sp = skb_sec_path(skb);
1115
1116 return sp->xvec[sp->len - 1];
1117}
1118#endif
1119
1120static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1121{
1122#ifdef CONFIG_XFRM
1123 struct sec_path *sp = skb_sec_path(skb);
1124
1125 if (!sp || !sp->olen || sp->len != sp->olen)
1126 return NULL;
1127
1128 return &sp->ovec[sp->olen - 1];
1129#else
1130 return NULL;
1131#endif
1132}
1133
1134#ifdef CONFIG_XFRM
1135int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1136 unsigned short family);
1137
1138static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1139 int dir)
1140{
1141 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1142 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1143
1144 return false;
1145}
1146
1147static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1148 int dir, unsigned short family)
1149{
1150 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1151 /* same dst may be used for traffic originating from
1152 * devices with different policy settings.
1153 */
1154 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1155 }
1156 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1157}
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 struct xfrm_offload *xo = xfrm_offload(skb);
1166 struct xfrm_state *x;
1167
1168 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1169 return __xfrm_policy_check(sk, ndir, skb, family);
1170
1171 if (xo) {
1172 x = xfrm_input_state(skb);
1173 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1174 return (xo->flags & CRYPTO_DONE) &&
1175 (xo->status & CRYPTO_SUCCESS);
1176 }
1177
1178 return __xfrm_check_nopolicy(net, skb, dir) ||
1179 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1180 __xfrm_policy_check(sk, ndir, skb, family);
1181}
1182
1183static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1184{
1185 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1186}
1187
1188static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1189{
1190 return xfrm_policy_check(sk, dir, skb, AF_INET);
1191}
1192
1193static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1194{
1195 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1196}
1197
1198static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1199 struct sk_buff *skb)
1200{
1201 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1202}
1203
1204static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1205 struct sk_buff *skb)
1206{
1207 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1208}
1209
1210int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1211 unsigned int family, int reverse);
1212
1213static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1214 unsigned int family)
1215{
1216 return __xfrm_decode_session(net, skb, fl, family, 0);
1217}
1218
1219static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1220 struct flowi *fl,
1221 unsigned int family)
1222{
1223 return __xfrm_decode_session(net, skb, fl, family, 1);
1224}
1225
1226int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1227
1228static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1229{
1230 struct net *net = dev_net(skb->dev);
1231
1232 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1233 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1234 return true;
1235
1236 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1237 __xfrm_route_forward(skb, family);
1238}
1239
1240static inline int xfrm4_route_forward(struct sk_buff *skb)
1241{
1242 return xfrm_route_forward(skb, AF_INET);
1243}
1244
1245static inline int xfrm6_route_forward(struct sk_buff *skb)
1246{
1247 return xfrm_route_forward(skb, AF_INET6);
1248}
1249
1250int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1251
1252static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1253{
1254 if (!sk_fullsock(osk))
1255 return 0;
1256 sk->sk_policy[0] = NULL;
1257 sk->sk_policy[1] = NULL;
1258 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1259 return __xfrm_sk_clone_policy(sk, osk);
1260 return 0;
1261}
1262
1263int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1264
1265static inline void xfrm_sk_free_policy(struct sock *sk)
1266{
1267 struct xfrm_policy *pol;
1268
1269 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1270 if (unlikely(pol != NULL)) {
1271 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1272 sk->sk_policy[0] = NULL;
1273 }
1274 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1275 if (unlikely(pol != NULL)) {
1276 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1277 sk->sk_policy[1] = NULL;
1278 }
1279}
1280
1281#else
1282
1283static inline void xfrm_sk_free_policy(struct sock *sk) {}
1284static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1285static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1286static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1287static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1288{
1289 return 1;
1290}
1291static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1292{
1293 return 1;
1294}
1295static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1296{
1297 return 1;
1298}
1299static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1300 struct flowi *fl,
1301 unsigned int family)
1302{
1303 return -ENOSYS;
1304}
1305static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1306 struct sk_buff *skb)
1307{
1308 return 1;
1309}
1310static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1311 struct sk_buff *skb)
1312{
1313 return 1;
1314}
1315#endif
1316
1317static __inline__
1318xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1319{
1320 switch (family){
1321 case AF_INET:
1322 return (xfrm_address_t *)&fl->u.ip4.daddr;
1323 case AF_INET6:
1324 return (xfrm_address_t *)&fl->u.ip6.daddr;
1325 }
1326 return NULL;
1327}
1328
1329static __inline__
1330xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1331{
1332 switch (family){
1333 case AF_INET:
1334 return (xfrm_address_t *)&fl->u.ip4.saddr;
1335 case AF_INET6:
1336 return (xfrm_address_t *)&fl->u.ip6.saddr;
1337 }
1338 return NULL;
1339}
1340
1341static __inline__
1342void xfrm_flowi_addr_get(const struct flowi *fl,
1343 xfrm_address_t *saddr, xfrm_address_t *daddr,
1344 unsigned short family)
1345{
1346 switch(family) {
1347 case AF_INET:
1348 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1349 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1350 break;
1351 case AF_INET6:
1352 saddr->in6 = fl->u.ip6.saddr;
1353 daddr->in6 = fl->u.ip6.daddr;
1354 break;
1355 }
1356}
1357
1358static __inline__ int
1359__xfrm4_state_addr_check(const struct xfrm_state *x,
1360 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1361{
1362 if (daddr->a4 == x->id.daddr.a4 &&
1363 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1364 return 1;
1365 return 0;
1366}
1367
1368static __inline__ int
1369__xfrm6_state_addr_check(const struct xfrm_state *x,
1370 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1371{
1372 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1373 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1374 ipv6_addr_any((struct in6_addr *)saddr) ||
1375 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1376 return 1;
1377 return 0;
1378}
1379
1380static __inline__ int
1381xfrm_state_addr_check(const struct xfrm_state *x,
1382 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1383 unsigned short family)
1384{
1385 switch (family) {
1386 case AF_INET:
1387 return __xfrm4_state_addr_check(x, daddr, saddr);
1388 case AF_INET6:
1389 return __xfrm6_state_addr_check(x, daddr, saddr);
1390 }
1391 return 0;
1392}
1393
1394static __inline__ int
1395xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1396 unsigned short family)
1397{
1398 switch (family) {
1399 case AF_INET:
1400 return __xfrm4_state_addr_check(x,
1401 (const xfrm_address_t *)&fl->u.ip4.daddr,
1402 (const xfrm_address_t *)&fl->u.ip4.saddr);
1403 case AF_INET6:
1404 return __xfrm6_state_addr_check(x,
1405 (const xfrm_address_t *)&fl->u.ip6.daddr,
1406 (const xfrm_address_t *)&fl->u.ip6.saddr);
1407 }
1408 return 0;
1409}
1410
1411static inline int xfrm_state_kern(const struct xfrm_state *x)
1412{
1413 return atomic_read(&x->tunnel_users);
1414}
1415
1416static inline bool xfrm_id_proto_valid(u8 proto)
1417{
1418 switch (proto) {
1419 case IPPROTO_AH:
1420 case IPPROTO_ESP:
1421 case IPPROTO_COMP:
1422#if IS_ENABLED(CONFIG_IPV6)
1423 case IPPROTO_ROUTING:
1424 case IPPROTO_DSTOPTS:
1425#endif
1426 return true;
1427 default:
1428 return false;
1429 }
1430}
1431
1432/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1433static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1434{
1435 return (!userproto || proto == userproto ||
1436 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1437 proto == IPPROTO_ESP ||
1438 proto == IPPROTO_COMP)));
1439}
1440
1441/*
1442 * xfrm algorithm information
1443 */
1444struct xfrm_algo_aead_info {
1445 char *geniv;
1446 u16 icv_truncbits;
1447};
1448
1449struct xfrm_algo_auth_info {
1450 u16 icv_truncbits;
1451 u16 icv_fullbits;
1452};
1453
1454struct xfrm_algo_encr_info {
1455 char *geniv;
1456 u16 blockbits;
1457 u16 defkeybits;
1458};
1459
1460struct xfrm_algo_comp_info {
1461 u16 threshold;
1462};
1463
1464struct xfrm_algo_desc {
1465 char *name;
1466 char *compat;
1467 u8 available:1;
1468 u8 pfkey_supported:1;
1469 union {
1470 struct xfrm_algo_aead_info aead;
1471 struct xfrm_algo_auth_info auth;
1472 struct xfrm_algo_encr_info encr;
1473 struct xfrm_algo_comp_info comp;
1474 } uinfo;
1475 struct sadb_alg desc;
1476};
1477
1478/* XFRM protocol handlers. */
1479struct xfrm4_protocol {
1480 int (*handler)(struct sk_buff *skb);
1481 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1482 int encap_type);
1483 int (*cb_handler)(struct sk_buff *skb, int err);
1484 int (*err_handler)(struct sk_buff *skb, u32 info);
1485
1486 struct xfrm4_protocol __rcu *next;
1487 int priority;
1488};
1489
1490struct xfrm6_protocol {
1491 int (*handler)(struct sk_buff *skb);
1492 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1493 int encap_type);
1494 int (*cb_handler)(struct sk_buff *skb, int err);
1495 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1496 u8 type, u8 code, int offset, __be32 info);
1497
1498 struct xfrm6_protocol __rcu *next;
1499 int priority;
1500};
1501
1502/* XFRM tunnel handlers. */
1503struct xfrm_tunnel {
1504 int (*handler)(struct sk_buff *skb);
1505 int (*cb_handler)(struct sk_buff *skb, int err);
1506 int (*err_handler)(struct sk_buff *skb, u32 info);
1507
1508 struct xfrm_tunnel __rcu *next;
1509 int priority;
1510};
1511
1512struct xfrm6_tunnel {
1513 int (*handler)(struct sk_buff *skb);
1514 int (*cb_handler)(struct sk_buff *skb, int err);
1515 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1516 u8 type, u8 code, int offset, __be32 info);
1517 struct xfrm6_tunnel __rcu *next;
1518 int priority;
1519};
1520
1521void xfrm_init(void);
1522void xfrm4_init(void);
1523int xfrm_state_init(struct net *net);
1524void xfrm_state_fini(struct net *net);
1525void xfrm4_state_init(void);
1526void xfrm4_protocol_init(void);
1527#ifdef CONFIG_XFRM
1528int xfrm6_init(void);
1529void xfrm6_fini(void);
1530int xfrm6_state_init(void);
1531void xfrm6_state_fini(void);
1532int xfrm6_protocol_init(void);
1533void xfrm6_protocol_fini(void);
1534#else
1535static inline int xfrm6_init(void)
1536{
1537 return 0;
1538}
1539static inline void xfrm6_fini(void)
1540{
1541 ;
1542}
1543#endif
1544
1545#ifdef CONFIG_XFRM_STATISTICS
1546int xfrm_proc_init(struct net *net);
1547void xfrm_proc_fini(struct net *net);
1548#endif
1549
1550int xfrm_sysctl_init(struct net *net);
1551#ifdef CONFIG_SYSCTL
1552void xfrm_sysctl_fini(struct net *net);
1553#else
1554static inline void xfrm_sysctl_fini(struct net *net)
1555{
1556}
1557#endif
1558
1559void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1560 struct xfrm_address_filter *filter);
1561int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1562 int (*func)(struct xfrm_state *, int, void*), void *);
1563void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1564struct xfrm_state *xfrm_state_alloc(struct net *net);
1565void xfrm_state_free(struct xfrm_state *x);
1566struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1567 const xfrm_address_t *saddr,
1568 const struct flowi *fl,
1569 struct xfrm_tmpl *tmpl,
1570 struct xfrm_policy *pol, int *err,
1571 unsigned short family, u32 if_id);
1572struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1573 xfrm_address_t *daddr,
1574 xfrm_address_t *saddr,
1575 unsigned short family,
1576 u8 mode, u8 proto, u32 reqid);
1577struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1578 unsigned short family);
1579int xfrm_state_check_expire(struct xfrm_state *x);
1580#ifdef CONFIG_XFRM_OFFLOAD
1581static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x)
1582{
1583 struct xfrm_dev_offload *xdo = &x->xso;
1584 struct net_device *dev = xdo->dev;
1585
1586 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1587 return;
1588
1589 if (dev && dev->xfrmdev_ops &&
1590 dev->xfrmdev_ops->xdo_dev_state_update_curlft)
1591 dev->xfrmdev_ops->xdo_dev_state_update_curlft(x);
1592
1593}
1594#else
1595static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {}
1596#endif
1597void xfrm_state_insert(struct xfrm_state *x);
1598int xfrm_state_add(struct xfrm_state *x);
1599int xfrm_state_update(struct xfrm_state *x);
1600struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1601 const xfrm_address_t *daddr, __be32 spi,
1602 u8 proto, unsigned short family);
1603struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1604 const xfrm_address_t *daddr,
1605 const xfrm_address_t *saddr,
1606 u8 proto,
1607 unsigned short family);
1608#ifdef CONFIG_XFRM_SUB_POLICY
1609void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1610 unsigned short family);
1611void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1612 unsigned short family);
1613#else
1614static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1615 int n, unsigned short family)
1616{
1617}
1618
1619static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1620 int n, unsigned short family)
1621{
1622}
1623#endif
1624
1625struct xfrmk_sadinfo {
1626 u32 sadhcnt; /* current hash bkts */
1627 u32 sadhmcnt; /* max allowed hash bkts */
1628 u32 sadcnt; /* current running count */
1629};
1630
1631struct xfrmk_spdinfo {
1632 u32 incnt;
1633 u32 outcnt;
1634 u32 fwdcnt;
1635 u32 inscnt;
1636 u32 outscnt;
1637 u32 fwdscnt;
1638 u32 spdhcnt;
1639 u32 spdhmcnt;
1640};
1641
1642struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1643int xfrm_state_delete(struct xfrm_state *x);
1644int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1645int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1646int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1647 bool task_valid);
1648void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1649void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1650u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1651int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1652u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1653int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1654 struct netlink_ext_ack *extack);
1655int xfrm_init_state(struct xfrm_state *x);
1656int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1657int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1658int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1659 int (*finish)(struct net *, struct sock *,
1660 struct sk_buff *));
1661int xfrm_trans_queue(struct sk_buff *skb,
1662 int (*finish)(struct net *, struct sock *,
1663 struct sk_buff *));
1664int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1665int xfrm_output(struct sock *sk, struct sk_buff *skb);
1666
1667#if IS_ENABLED(CONFIG_NET_PKTGEN)
1668int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1669#endif
1670
1671void xfrm_local_error(struct sk_buff *skb, int mtu);
1672int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1673 int encap_type);
1674int xfrm4_transport_finish(struct sk_buff *skb, int async);
1675int xfrm4_rcv(struct sk_buff *skb);
1676
1677static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1678{
1679 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1680 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1681 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1682 return xfrm_input(skb, nexthdr, spi, 0);
1683}
1684
1685int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1686int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1687int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1688int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1689int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1690void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1691int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1692 struct ip6_tnl *t);
1693int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1694 int encap_type);
1695int xfrm6_transport_finish(struct sk_buff *skb, int async);
1696int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1697int xfrm6_rcv(struct sk_buff *skb);
1698int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1699 xfrm_address_t *saddr, u8 proto);
1700void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1701int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1702int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1703int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1704int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1705__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1706__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1707int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1708
1709#ifdef CONFIG_XFRM
1710void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1711int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1712int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1713struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1714 struct sk_buff *skb);
1715struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1716 struct sk_buff *skb);
1717int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1718 int optlen);
1719#else
1720static inline int xfrm_user_policy(struct sock *sk, int optname,
1721 sockptr_t optval, int optlen)
1722{
1723 return -ENOPROTOOPT;
1724}
1725#endif
1726
1727struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1728 const xfrm_address_t *saddr,
1729 const xfrm_address_t *daddr,
1730 int family, u32 mark);
1731
1732struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1733
1734void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1735int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1736 int (*func)(struct xfrm_policy *, int, int, void*),
1737 void *);
1738void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1739int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1740struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1741 const struct xfrm_mark *mark,
1742 u32 if_id, u8 type, int dir,
1743 struct xfrm_selector *sel,
1744 struct xfrm_sec_ctx *ctx, int delete,
1745 int *err);
1746struct xfrm_policy *xfrm_policy_byid(struct net *net,
1747 const struct xfrm_mark *mark, u32 if_id,
1748 u8 type, int dir, u32 id, int delete,
1749 int *err);
1750int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1751void xfrm_policy_hash_rebuild(struct net *net);
1752u32 xfrm_get_acqseq(void);
1753int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1754int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1755 struct netlink_ext_ack *extack);
1756struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1757 u8 mode, u32 reqid, u32 if_id, u8 proto,
1758 const xfrm_address_t *daddr,
1759 const xfrm_address_t *saddr, int create,
1760 unsigned short family);
1761int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1762
1763#ifdef CONFIG_XFRM_MIGRATE
1764int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1765 const struct xfrm_migrate *m, int num_bundles,
1766 const struct xfrm_kmaddress *k,
1767 const struct xfrm_encap_tmpl *encap);
1768struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1769 u32 if_id);
1770struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1771 struct xfrm_migrate *m,
1772 struct xfrm_encap_tmpl *encap);
1773int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1774 struct xfrm_migrate *m, int num_bundles,
1775 struct xfrm_kmaddress *k, struct net *net,
1776 struct xfrm_encap_tmpl *encap, u32 if_id,
1777 struct netlink_ext_ack *extack);
1778#endif
1779
1780int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1781void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1782int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1783 xfrm_address_t *addr);
1784
1785void xfrm_input_init(void);
1786int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1787
1788void xfrm_probe_algs(void);
1789int xfrm_count_pfkey_auth_supported(void);
1790int xfrm_count_pfkey_enc_supported(void);
1791struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1792struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1793struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1794struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1795struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1796struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1797struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1798struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1799struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1800 int probe);
1801
1802static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1803 const xfrm_address_t *b)
1804{
1805 return ipv6_addr_equal((const struct in6_addr *)a,
1806 (const struct in6_addr *)b);
1807}
1808
1809static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1810 const xfrm_address_t *b,
1811 sa_family_t family)
1812{
1813 switch (family) {
1814 default:
1815 case AF_INET:
1816 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1817 case AF_INET6:
1818 return xfrm6_addr_equal(a, b);
1819 }
1820}
1821
1822static inline int xfrm_policy_id2dir(u32 index)
1823{
1824 return index & 7;
1825}
1826
1827#ifdef CONFIG_XFRM
1828void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1829int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1830void xfrm_replay_notify(struct xfrm_state *x, int event);
1831int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1832int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1833
1834static inline int xfrm_aevent_is_on(struct net *net)
1835{
1836 struct sock *nlsk;
1837 int ret = 0;
1838
1839 rcu_read_lock();
1840 nlsk = rcu_dereference(net->xfrm.nlsk);
1841 if (nlsk)
1842 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1843 rcu_read_unlock();
1844 return ret;
1845}
1846
1847static inline int xfrm_acquire_is_on(struct net *net)
1848{
1849 struct sock *nlsk;
1850 int ret = 0;
1851
1852 rcu_read_lock();
1853 nlsk = rcu_dereference(net->xfrm.nlsk);
1854 if (nlsk)
1855 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1856 rcu_read_unlock();
1857
1858 return ret;
1859}
1860#endif
1861
1862static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1863{
1864 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1865}
1866
1867static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1868{
1869 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1870}
1871
1872static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1873{
1874 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1875}
1876
1877static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1878{
1879 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1880}
1881
1882#ifdef CONFIG_XFRM_MIGRATE
1883static inline int xfrm_replay_clone(struct xfrm_state *x,
1884 struct xfrm_state *orig)
1885{
1886
1887 x->replay_esn = kmemdup(orig->replay_esn,
1888 xfrm_replay_state_esn_len(orig->replay_esn),
1889 GFP_KERNEL);
1890 if (!x->replay_esn)
1891 return -ENOMEM;
1892 x->preplay_esn = kmemdup(orig->preplay_esn,
1893 xfrm_replay_state_esn_len(orig->preplay_esn),
1894 GFP_KERNEL);
1895 if (!x->preplay_esn)
1896 return -ENOMEM;
1897
1898 return 0;
1899}
1900
1901static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1902{
1903 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1904}
1905
1906
1907static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1908{
1909 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1910}
1911
1912static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1913{
1914 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1915}
1916
1917static inline void xfrm_states_put(struct xfrm_state **states, int n)
1918{
1919 int i;
1920 for (i = 0; i < n; i++)
1921 xfrm_state_put(*(states + i));
1922}
1923
1924static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1925{
1926 int i;
1927 for (i = 0; i < n; i++)
1928 xfrm_state_delete(*(states + i));
1929}
1930#endif
1931
1932void __init xfrm_dev_init(void);
1933
1934#ifdef CONFIG_XFRM_OFFLOAD
1935void xfrm_dev_resume(struct sk_buff *skb);
1936void xfrm_dev_backlog(struct softnet_data *sd);
1937struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1938int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1939 struct xfrm_user_offload *xuo,
1940 struct netlink_ext_ack *extack);
1941int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1942 struct xfrm_user_offload *xuo, u8 dir,
1943 struct netlink_ext_ack *extack);
1944bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1945
1946static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1947{
1948 struct xfrm_dev_offload *xso = &x->xso;
1949
1950 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1951 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1952}
1953
1954static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1955{
1956 struct xfrm_state *x = dst->xfrm;
1957 struct xfrm_dst *xdst;
1958
1959 if (!x || !x->type_offload)
1960 return false;
1961
1962 xdst = (struct xfrm_dst *) dst;
1963 if (!x->xso.offload_handle && !xdst->child->xfrm)
1964 return true;
1965 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1966 !xdst->child->xfrm)
1967 return true;
1968
1969 return false;
1970}
1971
1972static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1973{
1974 struct xfrm_dev_offload *xso = &x->xso;
1975
1976 if (xso->dev)
1977 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1978}
1979
1980static inline void xfrm_dev_state_free(struct xfrm_state *x)
1981{
1982 struct xfrm_dev_offload *xso = &x->xso;
1983 struct net_device *dev = xso->dev;
1984
1985 if (dev && dev->xfrmdev_ops) {
1986 if (dev->xfrmdev_ops->xdo_dev_state_free)
1987 dev->xfrmdev_ops->xdo_dev_state_free(x);
1988 xso->dev = NULL;
1989 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1990 netdev_put(dev, &xso->dev_tracker);
1991 }
1992}
1993
1994static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1995{
1996 struct xfrm_dev_offload *xdo = &x->xdo;
1997 struct net_device *dev = xdo->dev;
1998
1999 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
2000 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
2001}
2002
2003static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2004{
2005 struct xfrm_dev_offload *xdo = &x->xdo;
2006 struct net_device *dev = xdo->dev;
2007
2008 if (dev && dev->xfrmdev_ops) {
2009 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2010 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2011 xdo->dev = NULL;
2012 netdev_put(dev, &xdo->dev_tracker);
2013 }
2014}
2015#else
2016static inline void xfrm_dev_resume(struct sk_buff *skb)
2017{
2018}
2019
2020static inline void xfrm_dev_backlog(struct softnet_data *sd)
2021{
2022}
2023
2024static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2025{
2026 return skb;
2027}
2028
2029static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2030{
2031 return 0;
2032}
2033
2034static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2035{
2036}
2037
2038static inline void xfrm_dev_state_free(struct xfrm_state *x)
2039{
2040}
2041
2042static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2043 struct xfrm_user_offload *xuo, u8 dir,
2044 struct netlink_ext_ack *extack)
2045{
2046 return 0;
2047}
2048
2049static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2050{
2051}
2052
2053static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2054{
2055}
2056
2057static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2058{
2059 return false;
2060}
2061
2062static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2063{
2064}
2065
2066static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2067{
2068 return false;
2069}
2070#endif
2071
2072static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2073{
2074 if (attrs[XFRMA_MARK])
2075 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2076 else
2077 m->v = m->m = 0;
2078
2079 return m->v & m->m;
2080}
2081
2082static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2083{
2084 int ret = 0;
2085
2086 if (m->m | m->v)
2087 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2088 return ret;
2089}
2090
2091static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2092{
2093 struct xfrm_mark *m = &x->props.smark;
2094
2095 return (m->v & m->m) | (mark & ~m->m);
2096}
2097
2098static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2099{
2100 int ret = 0;
2101
2102 if (if_id)
2103 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2104 return ret;
2105}
2106
2107static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2108 unsigned int family)
2109{
2110 bool tunnel = false;
2111
2112 switch(family) {
2113 case AF_INET:
2114 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2115 tunnel = true;
2116 break;
2117 case AF_INET6:
2118 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2119 tunnel = true;
2120 break;
2121 }
2122 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2123 return -EINVAL;
2124
2125 return 0;
2126}
2127
2128extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2129extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2130
2131struct xfrm_translator {
2132 /* Allocate frag_list and put compat translation there */
2133 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2134
2135 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2136 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2137 int maxtype, const struct nla_policy *policy,
2138 struct netlink_ext_ack *extack);
2139
2140 /* Translate 32-bit user_policy from sockptr */
2141 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2142
2143 struct module *owner;
2144};
2145
2146#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2147extern int xfrm_register_translator(struct xfrm_translator *xtr);
2148extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2149extern struct xfrm_translator *xfrm_get_translator(void);
2150extern void xfrm_put_translator(struct xfrm_translator *xtr);
2151#else
2152static inline struct xfrm_translator *xfrm_get_translator(void)
2153{
2154 return NULL;
2155}
2156static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2157{
2158}
2159#endif
2160
2161#if IS_ENABLED(CONFIG_IPV6)
2162static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2163{
2164 int proto;
2165
2166 if (!sk || sk->sk_family != AF_INET6)
2167 return false;
2168
2169 proto = sk->sk_protocol;
2170 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2171 return inet6_test_bit(DONTFRAG, sk);
2172
2173 return false;
2174}
2175#endif
2176
2177#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2178 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2179
2180extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2181
2182int register_xfrm_interface_bpf(void);
2183
2184#else
2185
2186static inline int register_xfrm_interface_bpf(void)
2187{
2188 return 0;
2189}
2190
2191#endif
2192
2193#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF)
2194int register_xfrm_state_bpf(void);
2195#else
2196static inline int register_xfrm_state_bpf(void)
2197{
2198 return 0;
2199}
2200#endif
2201
2202#endif /* _NET_XFRM_H */