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};
133
134struct xfrm_dev_offload {
135 struct net_device *dev;
136 netdevice_tracker dev_tracker;
137 struct net_device *real_dev;
138 unsigned long offload_handle;
139 u8 dir : 2;
140};
141
142struct xfrm_mode {
143 u8 encap;
144 u8 family;
145 u8 flags;
146};
147
148/* Flags for xfrm_mode. */
149enum {
150 XFRM_MODE_FLAG_TUNNEL = 1,
151};
152
153enum xfrm_replay_mode {
154 XFRM_REPLAY_MODE_LEGACY,
155 XFRM_REPLAY_MODE_BMP,
156 XFRM_REPLAY_MODE_ESN,
157};
158
159/* Full description of state of transformer. */
160struct xfrm_state {
161 possible_net_t xs_net;
162 union {
163 struct hlist_node gclist;
164 struct hlist_node bydst;
165 };
166 struct hlist_node bysrc;
167 struct hlist_node byspi;
168 struct hlist_node byseq;
169
170 refcount_t refcnt;
171 spinlock_t lock;
172
173 struct xfrm_id id;
174 struct xfrm_selector sel;
175 struct xfrm_mark mark;
176 u32 if_id;
177 u32 tfcpad;
178
179 u32 genid;
180
181 /* Key manager bits */
182 struct xfrm_state_walk km;
183
184 /* Parameters of this state. */
185 struct {
186 u32 reqid;
187 u8 mode;
188 u8 replay_window;
189 u8 aalgo, ealgo, calgo;
190 u8 flags;
191 u16 family;
192 xfrm_address_t saddr;
193 int header_len;
194 int trailer_len;
195 u32 extra_flags;
196 struct xfrm_mark smark;
197 } props;
198
199 struct xfrm_lifetime_cfg lft;
200
201 /* Data for transformer */
202 struct xfrm_algo_auth *aalg;
203 struct xfrm_algo *ealg;
204 struct xfrm_algo *calg;
205 struct xfrm_algo_aead *aead;
206 const char *geniv;
207
208 /* mapping change rate limiting */
209 __be16 new_mapping_sport;
210 u32 new_mapping; /* seconds */
211 u32 mapping_maxage; /* seconds for input SA */
212
213 /* Data for encapsulator */
214 struct xfrm_encap_tmpl *encap;
215 struct sock __rcu *encap_sk;
216
217 /* Data for care-of address */
218 xfrm_address_t *coaddr;
219
220 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
221 struct xfrm_state *tunnel;
222
223 /* If a tunnel, number of users + 1 */
224 atomic_t tunnel_users;
225
226 /* State for replay detection */
227 struct xfrm_replay_state replay;
228 struct xfrm_replay_state_esn *replay_esn;
229
230 /* Replay detection state at the time we sent the last notification */
231 struct xfrm_replay_state preplay;
232 struct xfrm_replay_state_esn *preplay_esn;
233
234 /* replay detection mode */
235 enum xfrm_replay_mode repl_mode;
236 /* internal flag that only holds state for delayed aevent at the
237 * moment
238 */
239 u32 xflags;
240
241 /* Replay detection notification settings */
242 u32 replay_maxage;
243 u32 replay_maxdiff;
244
245 /* Replay detection notification timer */
246 struct timer_list rtimer;
247
248 /* Statistics */
249 struct xfrm_stats stats;
250
251 struct xfrm_lifetime_cur curlft;
252 struct hrtimer mtimer;
253
254 struct xfrm_dev_offload xso;
255
256 /* used to fix curlft->add_time when changing date */
257 long saved_tmo;
258
259 /* Last used time */
260 time64_t lastused;
261
262 struct page_frag xfrag;
263
264 /* Reference to data common to all the instances of this
265 * transformer. */
266 const struct xfrm_type *type;
267 struct xfrm_mode inner_mode;
268 struct xfrm_mode inner_mode_iaf;
269 struct xfrm_mode outer_mode;
270
271 const struct xfrm_type_offload *type_offload;
272
273 /* Security context */
274 struct xfrm_sec_ctx *security;
275
276 /* Private data of this transformer, format is opaque,
277 * interpreted by xfrm_type methods. */
278 void *data;
279};
280
281static inline struct net *xs_net(struct xfrm_state *x)
282{
283 return read_pnet(&x->xs_net);
284}
285
286/* xflags - make enum if more show up */
287#define XFRM_TIME_DEFER 1
288#define XFRM_SOFT_EXPIRE 2
289
290enum {
291 XFRM_STATE_VOID,
292 XFRM_STATE_ACQ,
293 XFRM_STATE_VALID,
294 XFRM_STATE_ERROR,
295 XFRM_STATE_EXPIRED,
296 XFRM_STATE_DEAD
297};
298
299/* callback structure passed from either netlink or pfkey */
300struct km_event {
301 union {
302 u32 hard;
303 u32 proto;
304 u32 byid;
305 u32 aevent;
306 u32 type;
307 } data;
308
309 u32 seq;
310 u32 portid;
311 u32 event;
312 struct net *net;
313};
314
315struct xfrm_if_cb {
316 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
317 unsigned short family);
318};
319
320void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
321void xfrm_if_unregister_cb(void);
322
323struct net_device;
324struct xfrm_type;
325struct xfrm_dst;
326struct xfrm_policy_afinfo {
327 struct dst_ops *dst_ops;
328 struct dst_entry *(*dst_lookup)(struct net *net,
329 int tos, int oif,
330 const xfrm_address_t *saddr,
331 const xfrm_address_t *daddr,
332 u32 mark);
333 int (*get_saddr)(struct net *net, int oif,
334 xfrm_address_t *saddr,
335 xfrm_address_t *daddr,
336 u32 mark);
337 int (*fill_dst)(struct xfrm_dst *xdst,
338 struct net_device *dev,
339 const struct flowi *fl);
340 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
341};
342
343int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
344void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
345void km_policy_notify(struct xfrm_policy *xp, int dir,
346 const struct km_event *c);
347void km_state_notify(struct xfrm_state *x, const struct km_event *c);
348
349struct xfrm_tmpl;
350int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
351 struct xfrm_policy *pol);
352void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
353int __xfrm_state_delete(struct xfrm_state *x);
354
355struct xfrm_state_afinfo {
356 u8 family;
357 u8 proto;
358
359 const struct xfrm_type_offload *type_offload_esp;
360
361 const struct xfrm_type *type_esp;
362 const struct xfrm_type *type_ipip;
363 const struct xfrm_type *type_ipip6;
364 const struct xfrm_type *type_comp;
365 const struct xfrm_type *type_ah;
366 const struct xfrm_type *type_routing;
367 const struct xfrm_type *type_dstopts;
368
369 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
370 int (*transport_finish)(struct sk_buff *skb,
371 int async);
372 void (*local_error)(struct sk_buff *skb, u32 mtu);
373};
374
375int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
376int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
377struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
378struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
379
380struct xfrm_input_afinfo {
381 u8 family;
382 bool is_ipip;
383 int (*callback)(struct sk_buff *skb, u8 protocol,
384 int err);
385};
386
387int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
388int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
389
390void xfrm_flush_gc(void);
391void xfrm_state_delete_tunnel(struct xfrm_state *x);
392
393struct xfrm_type {
394 struct module *owner;
395 u8 proto;
396 u8 flags;
397#define XFRM_TYPE_NON_FRAGMENT 1
398#define XFRM_TYPE_REPLAY_PROT 2
399#define XFRM_TYPE_LOCAL_COADDR 4
400#define XFRM_TYPE_REMOTE_COADDR 8
401
402 int (*init_state)(struct xfrm_state *x);
403 void (*destructor)(struct xfrm_state *);
404 int (*input)(struct xfrm_state *, struct sk_buff *skb);
405 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
406 int (*reject)(struct xfrm_state *, struct sk_buff *,
407 const struct flowi *);
408};
409
410int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
411void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
412
413struct xfrm_type_offload {
414 struct module *owner;
415 u8 proto;
416 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
417 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
418 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
419};
420
421int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
422void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
423
424static inline int xfrm_af2proto(unsigned int family)
425{
426 switch(family) {
427 case AF_INET:
428 return IPPROTO_IPIP;
429 case AF_INET6:
430 return IPPROTO_IPV6;
431 default:
432 return 0;
433 }
434}
435
436static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
437{
438 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
439 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
440 return &x->inner_mode;
441 else
442 return &x->inner_mode_iaf;
443}
444
445struct xfrm_tmpl {
446/* id in template is interpreted as:
447 * daddr - destination of tunnel, may be zero for transport mode.
448 * spi - zero to acquire spi. Not zero if spi is static, then
449 * daddr must be fixed too.
450 * proto - AH/ESP/IPCOMP
451 */
452 struct xfrm_id id;
453
454/* Source address of tunnel. Ignored, if it is not a tunnel. */
455 xfrm_address_t saddr;
456
457 unsigned short encap_family;
458
459 u32 reqid;
460
461/* Mode: transport, tunnel etc. */
462 u8 mode;
463
464/* Sharing mode: unique, this session only, this user only etc. */
465 u8 share;
466
467/* May skip this transfomration if no SA is found */
468 u8 optional;
469
470/* Skip aalgos/ealgos/calgos checks. */
471 u8 allalgs;
472
473/* Bit mask of algos allowed for acquisition */
474 u32 aalgos;
475 u32 ealgos;
476 u32 calgos;
477};
478
479#define XFRM_MAX_DEPTH 6
480#define XFRM_MAX_OFFLOAD_DEPTH 1
481
482struct xfrm_policy_walk_entry {
483 struct list_head all;
484 u8 dead;
485};
486
487struct xfrm_policy_walk {
488 struct xfrm_policy_walk_entry walk;
489 u8 type;
490 u32 seq;
491};
492
493struct xfrm_policy_queue {
494 struct sk_buff_head hold_queue;
495 struct timer_list hold_timer;
496 unsigned long timeout;
497};
498
499struct xfrm_policy {
500 possible_net_t xp_net;
501 struct hlist_node bydst;
502 struct hlist_node byidx;
503
504 /* This lock only affects elements except for entry. */
505 rwlock_t lock;
506 refcount_t refcnt;
507 u32 pos;
508 struct timer_list timer;
509
510 atomic_t genid;
511 u32 priority;
512 u32 index;
513 u32 if_id;
514 struct xfrm_mark mark;
515 struct xfrm_selector selector;
516 struct xfrm_lifetime_cfg lft;
517 struct xfrm_lifetime_cur curlft;
518 struct xfrm_policy_walk_entry walk;
519 struct xfrm_policy_queue polq;
520 bool bydst_reinsert;
521 u8 type;
522 u8 action;
523 u8 flags;
524 u8 xfrm_nr;
525 u16 family;
526 struct xfrm_sec_ctx *security;
527 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
528 struct hlist_node bydst_inexact_list;
529 struct rcu_head rcu;
530};
531
532static inline struct net *xp_net(const struct xfrm_policy *xp)
533{
534 return read_pnet(&xp->xp_net);
535}
536
537struct xfrm_kmaddress {
538 xfrm_address_t local;
539 xfrm_address_t remote;
540 u32 reserved;
541 u16 family;
542};
543
544struct xfrm_migrate {
545 xfrm_address_t old_daddr;
546 xfrm_address_t old_saddr;
547 xfrm_address_t new_daddr;
548 xfrm_address_t new_saddr;
549 u8 proto;
550 u8 mode;
551 u16 reserved;
552 u32 reqid;
553 u16 old_family;
554 u16 new_family;
555};
556
557#define XFRM_KM_TIMEOUT 30
558/* what happened */
559#define XFRM_REPLAY_UPDATE XFRM_AE_CR
560#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
561
562/* default aevent timeout in units of 100ms */
563#define XFRM_AE_ETIME 10
564/* Async Event timer multiplier */
565#define XFRM_AE_ETH_M 10
566/* default seq threshold size */
567#define XFRM_AE_SEQT_SIZE 2
568
569struct xfrm_mgr {
570 struct list_head list;
571 int (*notify)(struct xfrm_state *x, const struct km_event *c);
572 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
573 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
574 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
575 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
576 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
577 int (*migrate)(const struct xfrm_selector *sel,
578 u8 dir, u8 type,
579 const struct xfrm_migrate *m,
580 int num_bundles,
581 const struct xfrm_kmaddress *k,
582 const struct xfrm_encap_tmpl *encap);
583 bool (*is_alive)(const struct km_event *c);
584};
585
586void xfrm_register_km(struct xfrm_mgr *km);
587void xfrm_unregister_km(struct xfrm_mgr *km);
588
589struct xfrm_tunnel_skb_cb {
590 union {
591 struct inet_skb_parm h4;
592 struct inet6_skb_parm h6;
593 } header;
594
595 union {
596 struct ip_tunnel *ip4;
597 struct ip6_tnl *ip6;
598 } tunnel;
599};
600
601#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
602
603/*
604 * This structure is used for the duration where packets are being
605 * transformed by IPsec. As soon as the packet leaves IPsec the
606 * area beyond the generic IP part may be overwritten.
607 */
608struct xfrm_skb_cb {
609 struct xfrm_tunnel_skb_cb header;
610
611 /* Sequence number for replay protection. */
612 union {
613 struct {
614 __u32 low;
615 __u32 hi;
616 } output;
617 struct {
618 __be32 low;
619 __be32 hi;
620 } input;
621 } seq;
622};
623
624#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
625
626/*
627 * This structure is used by the afinfo prepare_input/prepare_output functions
628 * to transmit header information to the mode input/output functions.
629 */
630struct xfrm_mode_skb_cb {
631 struct xfrm_tunnel_skb_cb header;
632
633 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
634 __be16 id;
635 __be16 frag_off;
636
637 /* IP header length (excluding options or extension headers). */
638 u8 ihl;
639
640 /* TOS for IPv4, class for IPv6. */
641 u8 tos;
642
643 /* TTL for IPv4, hop limitfor IPv6. */
644 u8 ttl;
645
646 /* Protocol for IPv4, NH for IPv6. */
647 u8 protocol;
648
649 /* Option length for IPv4, zero for IPv6. */
650 u8 optlen;
651
652 /* Used by IPv6 only, zero for IPv4. */
653 u8 flow_lbl[3];
654};
655
656#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
657
658/*
659 * This structure is used by the input processing to locate the SPI and
660 * related information.
661 */
662struct xfrm_spi_skb_cb {
663 struct xfrm_tunnel_skb_cb header;
664
665 unsigned int daddroff;
666 unsigned int family;
667 __be32 seq;
668};
669
670#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
671
672#ifdef CONFIG_AUDITSYSCALL
673static inline struct audit_buffer *xfrm_audit_start(const char *op)
674{
675 struct audit_buffer *audit_buf = NULL;
676
677 if (audit_enabled == AUDIT_OFF)
678 return NULL;
679 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
680 AUDIT_MAC_IPSEC_EVENT);
681 if (audit_buf == NULL)
682 return NULL;
683 audit_log_format(audit_buf, "op=%s", op);
684 return audit_buf;
685}
686
687static inline void xfrm_audit_helper_usrinfo(bool task_valid,
688 struct audit_buffer *audit_buf)
689{
690 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
691 audit_get_loginuid(current) :
692 INVALID_UID);
693 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
694 AUDIT_SID_UNSET;
695
696 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
697 audit_log_task_context(audit_buf);
698}
699
700void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
701void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
702 bool task_valid);
703void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
704void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
705void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
706 struct sk_buff *skb);
707void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
708 __be32 net_seq);
709void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
710void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
711 __be32 net_seq);
712void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
713 u8 proto);
714#else
715
716static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
717 bool task_valid)
718{
719}
720
721static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
722 bool task_valid)
723{
724}
725
726static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
727 bool task_valid)
728{
729}
730
731static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
732 bool task_valid)
733{
734}
735
736static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
737 struct sk_buff *skb)
738{
739}
740
741static inline void xfrm_audit_state_replay(struct xfrm_state *x,
742 struct sk_buff *skb, __be32 net_seq)
743{
744}
745
746static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
747 u16 family)
748{
749}
750
751static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
752 __be32 net_spi, __be32 net_seq)
753{
754}
755
756static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
757 struct sk_buff *skb, u8 proto)
758{
759}
760#endif /* CONFIG_AUDITSYSCALL */
761
762static inline void xfrm_pol_hold(struct xfrm_policy *policy)
763{
764 if (likely(policy != NULL))
765 refcount_inc(&policy->refcnt);
766}
767
768void xfrm_policy_destroy(struct xfrm_policy *policy);
769
770static inline void xfrm_pol_put(struct xfrm_policy *policy)
771{
772 if (refcount_dec_and_test(&policy->refcnt))
773 xfrm_policy_destroy(policy);
774}
775
776static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
777{
778 int i;
779 for (i = npols - 1; i >= 0; --i)
780 xfrm_pol_put(pols[i]);
781}
782
783void __xfrm_state_destroy(struct xfrm_state *, bool);
784
785static inline void __xfrm_state_put(struct xfrm_state *x)
786{
787 refcount_dec(&x->refcnt);
788}
789
790static inline void xfrm_state_put(struct xfrm_state *x)
791{
792 if (refcount_dec_and_test(&x->refcnt))
793 __xfrm_state_destroy(x, false);
794}
795
796static inline void xfrm_state_put_sync(struct xfrm_state *x)
797{
798 if (refcount_dec_and_test(&x->refcnt))
799 __xfrm_state_destroy(x, true);
800}
801
802static inline void xfrm_state_hold(struct xfrm_state *x)
803{
804 refcount_inc(&x->refcnt);
805}
806
807static inline bool addr_match(const void *token1, const void *token2,
808 unsigned int prefixlen)
809{
810 const __be32 *a1 = token1;
811 const __be32 *a2 = token2;
812 unsigned int pdw;
813 unsigned int pbi;
814
815 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
816 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
817
818 if (pdw)
819 if (memcmp(a1, a2, pdw << 2))
820 return false;
821
822 if (pbi) {
823 __be32 mask;
824
825 mask = htonl((0xffffffff) << (32 - pbi));
826
827 if ((a1[pdw] ^ a2[pdw]) & mask)
828 return false;
829 }
830
831 return true;
832}
833
834static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
835{
836 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
837 if (sizeof(long) == 4 && prefixlen == 0)
838 return true;
839 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
840}
841
842static __inline__
843__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
844{
845 __be16 port;
846 switch(fl->flowi_proto) {
847 case IPPROTO_TCP:
848 case IPPROTO_UDP:
849 case IPPROTO_UDPLITE:
850 case IPPROTO_SCTP:
851 port = uli->ports.sport;
852 break;
853 case IPPROTO_ICMP:
854 case IPPROTO_ICMPV6:
855 port = htons(uli->icmpt.type);
856 break;
857 case IPPROTO_MH:
858 port = htons(uli->mht.type);
859 break;
860 case IPPROTO_GRE:
861 port = htons(ntohl(uli->gre_key) >> 16);
862 break;
863 default:
864 port = 0; /*XXX*/
865 }
866 return port;
867}
868
869static __inline__
870__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
871{
872 __be16 port;
873 switch(fl->flowi_proto) {
874 case IPPROTO_TCP:
875 case IPPROTO_UDP:
876 case IPPROTO_UDPLITE:
877 case IPPROTO_SCTP:
878 port = uli->ports.dport;
879 break;
880 case IPPROTO_ICMP:
881 case IPPROTO_ICMPV6:
882 port = htons(uli->icmpt.code);
883 break;
884 case IPPROTO_GRE:
885 port = htons(ntohl(uli->gre_key) & 0xffff);
886 break;
887 default:
888 port = 0; /*XXX*/
889 }
890 return port;
891}
892
893bool xfrm_selector_match(const struct xfrm_selector *sel,
894 const struct flowi *fl, unsigned short family);
895
896#ifdef CONFIG_SECURITY_NETWORK_XFRM
897/* If neither has a context --> match
898 * Otherwise, both must have a context and the sids, doi, alg must match
899 */
900static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
901{
902 return ((!s1 && !s2) ||
903 (s1 && s2 &&
904 (s1->ctx_sid == s2->ctx_sid) &&
905 (s1->ctx_doi == s2->ctx_doi) &&
906 (s1->ctx_alg == s2->ctx_alg)));
907}
908#else
909static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
910{
911 return true;
912}
913#endif
914
915/* A struct encoding bundle of transformations to apply to some set of flow.
916 *
917 * xdst->child points to the next element of bundle.
918 * dst->xfrm points to an instanse of transformer.
919 *
920 * Due to unfortunate limitations of current routing cache, which we
921 * have no time to fix, it mirrors struct rtable and bound to the same
922 * routing key, including saddr,daddr. However, we can have many of
923 * bundles differing by session id. All the bundles grow from a parent
924 * policy rule.
925 */
926struct xfrm_dst {
927 union {
928 struct dst_entry dst;
929 struct rtable rt;
930 struct rt6_info rt6;
931 } u;
932 struct dst_entry *route;
933 struct dst_entry *child;
934 struct dst_entry *path;
935 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
936 int num_pols, num_xfrms;
937 u32 xfrm_genid;
938 u32 policy_genid;
939 u32 route_mtu_cached;
940 u32 child_mtu_cached;
941 u32 route_cookie;
942 u32 path_cookie;
943};
944
945static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
946{
947#ifdef CONFIG_XFRM
948 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
949 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
950
951 return xdst->path;
952 }
953#endif
954 return (struct dst_entry *) dst;
955}
956
957static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
958{
959#ifdef CONFIG_XFRM
960 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
961 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
962 return xdst->child;
963 }
964#endif
965 return NULL;
966}
967
968#ifdef CONFIG_XFRM
969static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
970{
971 xdst->child = child;
972}
973
974static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
975{
976 xfrm_pols_put(xdst->pols, xdst->num_pols);
977 dst_release(xdst->route);
978 if (likely(xdst->u.dst.xfrm))
979 xfrm_state_put(xdst->u.dst.xfrm);
980}
981#endif
982
983void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
984
985struct xfrm_if_parms {
986 int link; /* ifindex of underlying L2 interface */
987 u32 if_id; /* interface identifyer */
988};
989
990struct xfrm_if {
991 struct xfrm_if __rcu *next; /* next interface in list */
992 struct net_device *dev; /* virtual device associated with interface */
993 struct net *net; /* netns for packet i/o */
994 struct xfrm_if_parms p; /* interface parms */
995
996 struct gro_cells gro_cells;
997};
998
999struct xfrm_offload {
1000 /* Output sequence number for replay protection on offloading. */
1001 struct {
1002 __u32 low;
1003 __u32 hi;
1004 } seq;
1005
1006 __u32 flags;
1007#define SA_DELETE_REQ 1
1008#define CRYPTO_DONE 2
1009#define CRYPTO_NEXT_DONE 4
1010#define CRYPTO_FALLBACK 8
1011#define XFRM_GSO_SEGMENT 16
1012#define XFRM_GRO 32
1013/* 64 is free */
1014#define XFRM_DEV_RESUME 128
1015#define XFRM_XMIT 256
1016
1017 __u32 status;
1018#define CRYPTO_SUCCESS 1
1019#define CRYPTO_GENERIC_ERROR 2
1020#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1021#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1022#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1023#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1024#define CRYPTO_INVALID_PACKET_SYNTAX 64
1025#define CRYPTO_INVALID_PROTOCOL 128
1026
1027 __u8 proto;
1028 __u8 inner_ipproto;
1029};
1030
1031struct sec_path {
1032 int len;
1033 int olen;
1034
1035 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1036 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1037};
1038
1039struct sec_path *secpath_set(struct sk_buff *skb);
1040
1041static inline void
1042secpath_reset(struct sk_buff *skb)
1043{
1044#ifdef CONFIG_XFRM
1045 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1046#endif
1047}
1048
1049static inline int
1050xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1051{
1052 switch (family) {
1053 case AF_INET:
1054 return addr->a4 == 0;
1055 case AF_INET6:
1056 return ipv6_addr_any(&addr->in6);
1057 }
1058 return 0;
1059}
1060
1061static inline int
1062__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1063{
1064 return (tmpl->saddr.a4 &&
1065 tmpl->saddr.a4 != x->props.saddr.a4);
1066}
1067
1068static inline int
1069__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1070{
1071 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1072 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1073}
1074
1075static inline int
1076xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1077{
1078 switch (family) {
1079 case AF_INET:
1080 return __xfrm4_state_addr_cmp(tmpl, x);
1081 case AF_INET6:
1082 return __xfrm6_state_addr_cmp(tmpl, x);
1083 }
1084 return !0;
1085}
1086
1087#ifdef CONFIG_XFRM
1088int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1089 unsigned short family);
1090
1091static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1092 int dir)
1093{
1094 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1095 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1096
1097 return false;
1098}
1099
1100static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1101 int dir, unsigned short family)
1102{
1103 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1104 /* same dst may be used for traffic originating from
1105 * devices with different policy settings.
1106 */
1107 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1108 }
1109 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1110}
1111
1112static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1113 struct sk_buff *skb,
1114 unsigned int family, int reverse)
1115{
1116 struct net *net = dev_net(skb->dev);
1117 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1118
1119 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1120 return __xfrm_policy_check(sk, ndir, skb, family);
1121
1122 return __xfrm_check_nopolicy(net, skb, dir) ||
1123 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1124 __xfrm_policy_check(sk, ndir, skb, family);
1125}
1126
1127static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1128{
1129 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1130}
1131
1132static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1133{
1134 return xfrm_policy_check(sk, dir, skb, AF_INET);
1135}
1136
1137static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1138{
1139 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1140}
1141
1142static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1143 struct sk_buff *skb)
1144{
1145 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1146}
1147
1148static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1149 struct sk_buff *skb)
1150{
1151 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1152}
1153
1154int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1155 unsigned int family, int reverse);
1156
1157static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1158 unsigned int family)
1159{
1160 return __xfrm_decode_session(skb, fl, family, 0);
1161}
1162
1163static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1164 struct flowi *fl,
1165 unsigned int family)
1166{
1167 return __xfrm_decode_session(skb, fl, family, 1);
1168}
1169
1170int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1171
1172static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1173{
1174 struct net *net = dev_net(skb->dev);
1175
1176 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1177 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1178 return true;
1179
1180 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1181 __xfrm_route_forward(skb, family);
1182}
1183
1184static inline int xfrm4_route_forward(struct sk_buff *skb)
1185{
1186 return xfrm_route_forward(skb, AF_INET);
1187}
1188
1189static inline int xfrm6_route_forward(struct sk_buff *skb)
1190{
1191 return xfrm_route_forward(skb, AF_INET6);
1192}
1193
1194int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1195
1196static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1197{
1198 if (!sk_fullsock(osk))
1199 return 0;
1200 sk->sk_policy[0] = NULL;
1201 sk->sk_policy[1] = NULL;
1202 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1203 return __xfrm_sk_clone_policy(sk, osk);
1204 return 0;
1205}
1206
1207int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1208
1209static inline void xfrm_sk_free_policy(struct sock *sk)
1210{
1211 struct xfrm_policy *pol;
1212
1213 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1214 if (unlikely(pol != NULL)) {
1215 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1216 sk->sk_policy[0] = NULL;
1217 }
1218 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1219 if (unlikely(pol != NULL)) {
1220 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1221 sk->sk_policy[1] = NULL;
1222 }
1223}
1224
1225#else
1226
1227static inline void xfrm_sk_free_policy(struct sock *sk) {}
1228static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1229static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1230static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1231static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1232{
1233 return 1;
1234}
1235static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1236{
1237 return 1;
1238}
1239static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1240{
1241 return 1;
1242}
1243static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1244 struct flowi *fl,
1245 unsigned int family)
1246{
1247 return -ENOSYS;
1248}
1249static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1250 struct sk_buff *skb)
1251{
1252 return 1;
1253}
1254static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1255 struct sk_buff *skb)
1256{
1257 return 1;
1258}
1259#endif
1260
1261static __inline__
1262xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1263{
1264 switch (family){
1265 case AF_INET:
1266 return (xfrm_address_t *)&fl->u.ip4.daddr;
1267 case AF_INET6:
1268 return (xfrm_address_t *)&fl->u.ip6.daddr;
1269 }
1270 return NULL;
1271}
1272
1273static __inline__
1274xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1275{
1276 switch (family){
1277 case AF_INET:
1278 return (xfrm_address_t *)&fl->u.ip4.saddr;
1279 case AF_INET6:
1280 return (xfrm_address_t *)&fl->u.ip6.saddr;
1281 }
1282 return NULL;
1283}
1284
1285static __inline__
1286void xfrm_flowi_addr_get(const struct flowi *fl,
1287 xfrm_address_t *saddr, xfrm_address_t *daddr,
1288 unsigned short family)
1289{
1290 switch(family) {
1291 case AF_INET:
1292 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1293 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1294 break;
1295 case AF_INET6:
1296 saddr->in6 = fl->u.ip6.saddr;
1297 daddr->in6 = fl->u.ip6.daddr;
1298 break;
1299 }
1300}
1301
1302static __inline__ int
1303__xfrm4_state_addr_check(const struct xfrm_state *x,
1304 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1305{
1306 if (daddr->a4 == x->id.daddr.a4 &&
1307 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1308 return 1;
1309 return 0;
1310}
1311
1312static __inline__ int
1313__xfrm6_state_addr_check(const struct xfrm_state *x,
1314 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1315{
1316 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1317 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1318 ipv6_addr_any((struct in6_addr *)saddr) ||
1319 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1320 return 1;
1321 return 0;
1322}
1323
1324static __inline__ int
1325xfrm_state_addr_check(const struct xfrm_state *x,
1326 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1327 unsigned short family)
1328{
1329 switch (family) {
1330 case AF_INET:
1331 return __xfrm4_state_addr_check(x, daddr, saddr);
1332 case AF_INET6:
1333 return __xfrm6_state_addr_check(x, daddr, saddr);
1334 }
1335 return 0;
1336}
1337
1338static __inline__ int
1339xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1340 unsigned short family)
1341{
1342 switch (family) {
1343 case AF_INET:
1344 return __xfrm4_state_addr_check(x,
1345 (const xfrm_address_t *)&fl->u.ip4.daddr,
1346 (const xfrm_address_t *)&fl->u.ip4.saddr);
1347 case AF_INET6:
1348 return __xfrm6_state_addr_check(x,
1349 (const xfrm_address_t *)&fl->u.ip6.daddr,
1350 (const xfrm_address_t *)&fl->u.ip6.saddr);
1351 }
1352 return 0;
1353}
1354
1355static inline int xfrm_state_kern(const struct xfrm_state *x)
1356{
1357 return atomic_read(&x->tunnel_users);
1358}
1359
1360static inline bool xfrm_id_proto_valid(u8 proto)
1361{
1362 switch (proto) {
1363 case IPPROTO_AH:
1364 case IPPROTO_ESP:
1365 case IPPROTO_COMP:
1366#if IS_ENABLED(CONFIG_IPV6)
1367 case IPPROTO_ROUTING:
1368 case IPPROTO_DSTOPTS:
1369#endif
1370 return true;
1371 default:
1372 return false;
1373 }
1374}
1375
1376/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1377static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1378{
1379 return (!userproto || proto == userproto ||
1380 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1381 proto == IPPROTO_ESP ||
1382 proto == IPPROTO_COMP)));
1383}
1384
1385/*
1386 * xfrm algorithm information
1387 */
1388struct xfrm_algo_aead_info {
1389 char *geniv;
1390 u16 icv_truncbits;
1391};
1392
1393struct xfrm_algo_auth_info {
1394 u16 icv_truncbits;
1395 u16 icv_fullbits;
1396};
1397
1398struct xfrm_algo_encr_info {
1399 char *geniv;
1400 u16 blockbits;
1401 u16 defkeybits;
1402};
1403
1404struct xfrm_algo_comp_info {
1405 u16 threshold;
1406};
1407
1408struct xfrm_algo_desc {
1409 char *name;
1410 char *compat;
1411 u8 available:1;
1412 u8 pfkey_supported:1;
1413 union {
1414 struct xfrm_algo_aead_info aead;
1415 struct xfrm_algo_auth_info auth;
1416 struct xfrm_algo_encr_info encr;
1417 struct xfrm_algo_comp_info comp;
1418 } uinfo;
1419 struct sadb_alg desc;
1420};
1421
1422/* XFRM protocol handlers. */
1423struct xfrm4_protocol {
1424 int (*handler)(struct sk_buff *skb);
1425 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1426 int encap_type);
1427 int (*cb_handler)(struct sk_buff *skb, int err);
1428 int (*err_handler)(struct sk_buff *skb, u32 info);
1429
1430 struct xfrm4_protocol __rcu *next;
1431 int priority;
1432};
1433
1434struct xfrm6_protocol {
1435 int (*handler)(struct sk_buff *skb);
1436 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1437 int encap_type);
1438 int (*cb_handler)(struct sk_buff *skb, int err);
1439 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1440 u8 type, u8 code, int offset, __be32 info);
1441
1442 struct xfrm6_protocol __rcu *next;
1443 int priority;
1444};
1445
1446/* XFRM tunnel handlers. */
1447struct xfrm_tunnel {
1448 int (*handler)(struct sk_buff *skb);
1449 int (*cb_handler)(struct sk_buff *skb, int err);
1450 int (*err_handler)(struct sk_buff *skb, u32 info);
1451
1452 struct xfrm_tunnel __rcu *next;
1453 int priority;
1454};
1455
1456struct xfrm6_tunnel {
1457 int (*handler)(struct sk_buff *skb);
1458 int (*cb_handler)(struct sk_buff *skb, int err);
1459 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1460 u8 type, u8 code, int offset, __be32 info);
1461 struct xfrm6_tunnel __rcu *next;
1462 int priority;
1463};
1464
1465void xfrm_init(void);
1466void xfrm4_init(void);
1467int xfrm_state_init(struct net *net);
1468void xfrm_state_fini(struct net *net);
1469void xfrm4_state_init(void);
1470void xfrm4_protocol_init(void);
1471#ifdef CONFIG_XFRM
1472int xfrm6_init(void);
1473void xfrm6_fini(void);
1474int xfrm6_state_init(void);
1475void xfrm6_state_fini(void);
1476int xfrm6_protocol_init(void);
1477void xfrm6_protocol_fini(void);
1478#else
1479static inline int xfrm6_init(void)
1480{
1481 return 0;
1482}
1483static inline void xfrm6_fini(void)
1484{
1485 ;
1486}
1487#endif
1488
1489#ifdef CONFIG_XFRM_STATISTICS
1490int xfrm_proc_init(struct net *net);
1491void xfrm_proc_fini(struct net *net);
1492#endif
1493
1494int xfrm_sysctl_init(struct net *net);
1495#ifdef CONFIG_SYSCTL
1496void xfrm_sysctl_fini(struct net *net);
1497#else
1498static inline void xfrm_sysctl_fini(struct net *net)
1499{
1500}
1501#endif
1502
1503void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1504 struct xfrm_address_filter *filter);
1505int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1506 int (*func)(struct xfrm_state *, int, void*), void *);
1507void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1508struct xfrm_state *xfrm_state_alloc(struct net *net);
1509void xfrm_state_free(struct xfrm_state *x);
1510struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1511 const xfrm_address_t *saddr,
1512 const struct flowi *fl,
1513 struct xfrm_tmpl *tmpl,
1514 struct xfrm_policy *pol, int *err,
1515 unsigned short family, u32 if_id);
1516struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1517 xfrm_address_t *daddr,
1518 xfrm_address_t *saddr,
1519 unsigned short family,
1520 u8 mode, u8 proto, u32 reqid);
1521struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1522 unsigned short family);
1523int xfrm_state_check_expire(struct xfrm_state *x);
1524void xfrm_state_insert(struct xfrm_state *x);
1525int xfrm_state_add(struct xfrm_state *x);
1526int xfrm_state_update(struct xfrm_state *x);
1527struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1528 const xfrm_address_t *daddr, __be32 spi,
1529 u8 proto, unsigned short family);
1530struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1531 const xfrm_address_t *daddr,
1532 const xfrm_address_t *saddr,
1533 u8 proto,
1534 unsigned short family);
1535#ifdef CONFIG_XFRM_SUB_POLICY
1536void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1537 unsigned short family);
1538void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1539 unsigned short family);
1540#else
1541static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1542 int n, unsigned short family)
1543{
1544}
1545
1546static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1547 int n, unsigned short family)
1548{
1549}
1550#endif
1551
1552struct xfrmk_sadinfo {
1553 u32 sadhcnt; /* current hash bkts */
1554 u32 sadhmcnt; /* max allowed hash bkts */
1555 u32 sadcnt; /* current running count */
1556};
1557
1558struct xfrmk_spdinfo {
1559 u32 incnt;
1560 u32 outcnt;
1561 u32 fwdcnt;
1562 u32 inscnt;
1563 u32 outscnt;
1564 u32 fwdscnt;
1565 u32 spdhcnt;
1566 u32 spdhmcnt;
1567};
1568
1569struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1570int xfrm_state_delete(struct xfrm_state *x);
1571int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1572int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1573void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1574void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1575u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1576int xfrm_init_replay(struct xfrm_state *x);
1577u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1578int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1579int xfrm_init_state(struct xfrm_state *x);
1580int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1581int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1582int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1583 int (*finish)(struct net *, struct sock *,
1584 struct sk_buff *));
1585int xfrm_trans_queue(struct sk_buff *skb,
1586 int (*finish)(struct net *, struct sock *,
1587 struct sk_buff *));
1588int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1589int xfrm_output(struct sock *sk, struct sk_buff *skb);
1590
1591#if IS_ENABLED(CONFIG_NET_PKTGEN)
1592int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1593#endif
1594
1595void xfrm_local_error(struct sk_buff *skb, int mtu);
1596int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1597int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1598 int encap_type);
1599int xfrm4_transport_finish(struct sk_buff *skb, int async);
1600int xfrm4_rcv(struct sk_buff *skb);
1601
1602static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1603{
1604 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1605 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1606 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1607 return xfrm_input(skb, nexthdr, spi, 0);
1608}
1609
1610int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1611int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1612int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1613int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1614int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1615void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1616int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1617int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1618 struct ip6_tnl *t);
1619int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1620 int encap_type);
1621int xfrm6_transport_finish(struct sk_buff *skb, int async);
1622int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1623int xfrm6_rcv(struct sk_buff *skb);
1624int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1625 xfrm_address_t *saddr, u8 proto);
1626void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1627int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1628int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1629int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1630int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1631__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1632__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1633int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1634
1635#ifdef CONFIG_XFRM
1636void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1637int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1638int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1639int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1640 int optlen);
1641#else
1642static inline int xfrm_user_policy(struct sock *sk, int optname,
1643 sockptr_t optval, int optlen)
1644{
1645 return -ENOPROTOOPT;
1646}
1647#endif
1648
1649struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1650 const xfrm_address_t *saddr,
1651 const xfrm_address_t *daddr,
1652 int family, u32 mark);
1653
1654struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1655
1656void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1657int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1658 int (*func)(struct xfrm_policy *, int, int, void*),
1659 void *);
1660void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1661int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1662struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1663 const struct xfrm_mark *mark,
1664 u32 if_id, u8 type, int dir,
1665 struct xfrm_selector *sel,
1666 struct xfrm_sec_ctx *ctx, int delete,
1667 int *err);
1668struct xfrm_policy *xfrm_policy_byid(struct net *net,
1669 const struct xfrm_mark *mark, u32 if_id,
1670 u8 type, int dir, u32 id, int delete,
1671 int *err);
1672int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1673void xfrm_policy_hash_rebuild(struct net *net);
1674u32 xfrm_get_acqseq(void);
1675int verify_spi_info(u8 proto, u32 min, u32 max);
1676int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1677struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1678 u8 mode, u32 reqid, u32 if_id, u8 proto,
1679 const xfrm_address_t *daddr,
1680 const xfrm_address_t *saddr, int create,
1681 unsigned short family);
1682int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1683
1684#ifdef CONFIG_XFRM_MIGRATE
1685int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1686 const struct xfrm_migrate *m, int num_bundles,
1687 const struct xfrm_kmaddress *k,
1688 const struct xfrm_encap_tmpl *encap);
1689struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1690 u32 if_id);
1691struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1692 struct xfrm_migrate *m,
1693 struct xfrm_encap_tmpl *encap);
1694int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1695 struct xfrm_migrate *m, int num_bundles,
1696 struct xfrm_kmaddress *k, struct net *net,
1697 struct xfrm_encap_tmpl *encap, u32 if_id);
1698#endif
1699
1700int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1701void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1702int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1703 xfrm_address_t *addr);
1704
1705void xfrm_input_init(void);
1706int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1707
1708void xfrm_probe_algs(void);
1709int xfrm_count_pfkey_auth_supported(void);
1710int xfrm_count_pfkey_enc_supported(void);
1711struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1712struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1713struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1714struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1715struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1716struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1717struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1718struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1719struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1720 int probe);
1721
1722static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1723 const xfrm_address_t *b)
1724{
1725 return ipv6_addr_equal((const struct in6_addr *)a,
1726 (const struct in6_addr *)b);
1727}
1728
1729static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1730 const xfrm_address_t *b,
1731 sa_family_t family)
1732{
1733 switch (family) {
1734 default:
1735 case AF_INET:
1736 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1737 case AF_INET6:
1738 return xfrm6_addr_equal(a, b);
1739 }
1740}
1741
1742static inline int xfrm_policy_id2dir(u32 index)
1743{
1744 return index & 7;
1745}
1746
1747#ifdef CONFIG_XFRM
1748void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1749int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1750void xfrm_replay_notify(struct xfrm_state *x, int event);
1751int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1752int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1753
1754static inline int xfrm_aevent_is_on(struct net *net)
1755{
1756 struct sock *nlsk;
1757 int ret = 0;
1758
1759 rcu_read_lock();
1760 nlsk = rcu_dereference(net->xfrm.nlsk);
1761 if (nlsk)
1762 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1763 rcu_read_unlock();
1764 return ret;
1765}
1766
1767static inline int xfrm_acquire_is_on(struct net *net)
1768{
1769 struct sock *nlsk;
1770 int ret = 0;
1771
1772 rcu_read_lock();
1773 nlsk = rcu_dereference(net->xfrm.nlsk);
1774 if (nlsk)
1775 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1776 rcu_read_unlock();
1777
1778 return ret;
1779}
1780#endif
1781
1782static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1783{
1784 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1785}
1786
1787static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1788{
1789 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1790}
1791
1792static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1793{
1794 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1795}
1796
1797static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1798{
1799 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1800}
1801
1802#ifdef CONFIG_XFRM_MIGRATE
1803static inline int xfrm_replay_clone(struct xfrm_state *x,
1804 struct xfrm_state *orig)
1805{
1806
1807 x->replay_esn = kmemdup(orig->replay_esn,
1808 xfrm_replay_state_esn_len(orig->replay_esn),
1809 GFP_KERNEL);
1810 if (!x->replay_esn)
1811 return -ENOMEM;
1812 x->preplay_esn = kmemdup(orig->preplay_esn,
1813 xfrm_replay_state_esn_len(orig->preplay_esn),
1814 GFP_KERNEL);
1815 if (!x->preplay_esn)
1816 return -ENOMEM;
1817
1818 return 0;
1819}
1820
1821static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1822{
1823 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1824}
1825
1826
1827static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1828{
1829 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1830}
1831
1832static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1833{
1834 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1835}
1836
1837static inline void xfrm_states_put(struct xfrm_state **states, int n)
1838{
1839 int i;
1840 for (i = 0; i < n; i++)
1841 xfrm_state_put(*(states + i));
1842}
1843
1844static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1845{
1846 int i;
1847 for (i = 0; i < n; i++)
1848 xfrm_state_delete(*(states + i));
1849}
1850#endif
1851
1852#ifdef CONFIG_XFRM
1853static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1854{
1855 struct sec_path *sp = skb_sec_path(skb);
1856
1857 return sp->xvec[sp->len - 1];
1858}
1859#endif
1860
1861static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1862{
1863#ifdef CONFIG_XFRM
1864 struct sec_path *sp = skb_sec_path(skb);
1865
1866 if (!sp || !sp->olen || sp->len != sp->olen)
1867 return NULL;
1868
1869 return &sp->ovec[sp->olen - 1];
1870#else
1871 return NULL;
1872#endif
1873}
1874
1875void __init xfrm_dev_init(void);
1876
1877#ifdef CONFIG_XFRM_OFFLOAD
1878void xfrm_dev_resume(struct sk_buff *skb);
1879void xfrm_dev_backlog(struct softnet_data *sd);
1880struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1881int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1882 struct xfrm_user_offload *xuo);
1883bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1884
1885static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1886{
1887 struct xfrm_dev_offload *xso = &x->xso;
1888
1889 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1890 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1891}
1892
1893static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1894{
1895 struct xfrm_state *x = dst->xfrm;
1896 struct xfrm_dst *xdst;
1897
1898 if (!x || !x->type_offload)
1899 return false;
1900
1901 xdst = (struct xfrm_dst *) dst;
1902 if (!x->xso.offload_handle && !xdst->child->xfrm)
1903 return true;
1904 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1905 !xdst->child->xfrm)
1906 return true;
1907
1908 return false;
1909}
1910
1911static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1912{
1913 struct xfrm_dev_offload *xso = &x->xso;
1914
1915 if (xso->dev)
1916 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1917}
1918
1919static inline void xfrm_dev_state_free(struct xfrm_state *x)
1920{
1921 struct xfrm_dev_offload *xso = &x->xso;
1922 struct net_device *dev = xso->dev;
1923
1924 if (dev && dev->xfrmdev_ops) {
1925 if (dev->xfrmdev_ops->xdo_dev_state_free)
1926 dev->xfrmdev_ops->xdo_dev_state_free(x);
1927 xso->dev = NULL;
1928 netdev_put(dev, &xso->dev_tracker);
1929 }
1930}
1931#else
1932static inline void xfrm_dev_resume(struct sk_buff *skb)
1933{
1934}
1935
1936static inline void xfrm_dev_backlog(struct softnet_data *sd)
1937{
1938}
1939
1940static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1941{
1942 return skb;
1943}
1944
1945static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1946{
1947 return 0;
1948}
1949
1950static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1951{
1952}
1953
1954static inline void xfrm_dev_state_free(struct xfrm_state *x)
1955{
1956}
1957
1958static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1959{
1960 return false;
1961}
1962
1963static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1964{
1965}
1966
1967static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1968{
1969 return false;
1970}
1971#endif
1972
1973static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1974{
1975 if (attrs[XFRMA_MARK])
1976 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1977 else
1978 m->v = m->m = 0;
1979
1980 return m->v & m->m;
1981}
1982
1983static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1984{
1985 int ret = 0;
1986
1987 if (m->m | m->v)
1988 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1989 return ret;
1990}
1991
1992static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1993{
1994 struct xfrm_mark *m = &x->props.smark;
1995
1996 return (m->v & m->m) | (mark & ~m->m);
1997}
1998
1999static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2000{
2001 int ret = 0;
2002
2003 if (if_id)
2004 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2005 return ret;
2006}
2007
2008static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2009 unsigned int family)
2010{
2011 bool tunnel = false;
2012
2013 switch(family) {
2014 case AF_INET:
2015 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2016 tunnel = true;
2017 break;
2018 case AF_INET6:
2019 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2020 tunnel = true;
2021 break;
2022 }
2023 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2024 return -EINVAL;
2025
2026 return 0;
2027}
2028
2029extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2030extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2031
2032struct xfrm_translator {
2033 /* Allocate frag_list and put compat translation there */
2034 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2035
2036 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2037 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2038 int maxtype, const struct nla_policy *policy,
2039 struct netlink_ext_ack *extack);
2040
2041 /* Translate 32-bit user_policy from sockptr */
2042 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2043
2044 struct module *owner;
2045};
2046
2047#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2048extern int xfrm_register_translator(struct xfrm_translator *xtr);
2049extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2050extern struct xfrm_translator *xfrm_get_translator(void);
2051extern void xfrm_put_translator(struct xfrm_translator *xtr);
2052#else
2053static inline struct xfrm_translator *xfrm_get_translator(void)
2054{
2055 return NULL;
2056}
2057static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2058{
2059}
2060#endif
2061
2062#if IS_ENABLED(CONFIG_IPV6)
2063static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2064{
2065 int proto;
2066
2067 if (!sk || sk->sk_family != AF_INET6)
2068 return false;
2069
2070 proto = sk->sk_protocol;
2071 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2072 return inet6_sk(sk)->dontfrag;
2073
2074 return false;
2075}
2076#endif
2077#endif /* _NET_XFRM_H */
2078

source code of linux/include/net/xfrm.h