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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_XFRM_H
3#define _NET_XFRM_H
4
5#include <linux/compiler.h>
6#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/pfkeyv2.h>
12#include <linux/ipsec.h>
13#include <linux/in6.h>
14#include <linux/mutex.h>
15#include <linux/audit.h>
16#include <linux/slab.h>
17#include <linux/refcount.h>
18
19#include <net/sock.h>
20#include <net/dst.h>
21#include <net/ip.h>
22#include <net/route.h>
23#include <net/ipv6.h>
24#include <net/ip6_fib.h>
25#include <net/flow.h>
26#include <net/gro_cells.h>
27
28#include <linux/interrupt.h>
29
30#ifdef CONFIG_XFRM_STATISTICS
31#include <net/snmp.h>
32#endif
33
34#define XFRM_PROTO_ESP 50
35#define XFRM_PROTO_AH 51
36#define XFRM_PROTO_COMP 108
37#define XFRM_PROTO_IPIP 4
38#define XFRM_PROTO_IPV6 41
39#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
40#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
41
42#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
43#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
44#define MODULE_ALIAS_XFRM_MODE(family, encap) \
45 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
46#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
47 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
48#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
49 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
50
51#ifdef CONFIG_XFRM_STATISTICS
52#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
53#else
54#define XFRM_INC_STATS(net, field) ((void)(net))
55#endif
56
57
58/* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 u8 dying;
123 u8 proto;
124 u32 seq;
125 struct xfrm_address_filter *filter;
126};
127
128struct xfrm_state_offload {
129 struct net_device *dev;
130 unsigned long offload_handle;
131 unsigned int num_exthdrs;
132 u8 flags;
133};
134
135struct xfrm_mode {
136 u8 encap;
137 u8 family;
138 u8 flags;
139};
140
141/* Flags for xfrm_mode. */
142enum {
143 XFRM_MODE_FLAG_TUNNEL = 1,
144};
145
146/* Full description of state of transformer. */
147struct xfrm_state {
148 possible_net_t xs_net;
149 union {
150 struct hlist_node gclist;
151 struct hlist_node bydst;
152 };
153 struct hlist_node bysrc;
154 struct hlist_node byspi;
155
156 refcount_t refcnt;
157 spinlock_t lock;
158
159 struct xfrm_id id;
160 struct xfrm_selector sel;
161 struct xfrm_mark mark;
162 u32 if_id;
163 u32 tfcpad;
164
165 u32 genid;
166
167 /* Key manager bits */
168 struct xfrm_state_walk km;
169
170 /* Parameters of this state. */
171 struct {
172 u32 reqid;
173 u8 mode;
174 u8 replay_window;
175 u8 aalgo, ealgo, calgo;
176 u8 flags;
177 u16 family;
178 xfrm_address_t saddr;
179 int header_len;
180 int trailer_len;
181 u32 extra_flags;
182 struct xfrm_mark smark;
183 } props;
184
185 struct xfrm_lifetime_cfg lft;
186
187 /* Data for transformer */
188 struct xfrm_algo_auth *aalg;
189 struct xfrm_algo *ealg;
190 struct xfrm_algo *calg;
191 struct xfrm_algo_aead *aead;
192 const char *geniv;
193
194 /* Data for encapsulator */
195 struct xfrm_encap_tmpl *encap;
196
197 /* Data for care-of address */
198 xfrm_address_t *coaddr;
199
200 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
201 struct xfrm_state *tunnel;
202
203 /* If a tunnel, number of users + 1 */
204 atomic_t tunnel_users;
205
206 /* State for replay detection */
207 struct xfrm_replay_state replay;
208 struct xfrm_replay_state_esn *replay_esn;
209
210 /* Replay detection state at the time we sent the last notification */
211 struct xfrm_replay_state preplay;
212 struct xfrm_replay_state_esn *preplay_esn;
213
214 /* The functions for replay detection. */
215 const struct xfrm_replay *repl;
216
217 /* internal flag that only holds state for delayed aevent at the
218 * moment
219 */
220 u32 xflags;
221
222 /* Replay detection notification settings */
223 u32 replay_maxage;
224 u32 replay_maxdiff;
225
226 /* Replay detection notification timer */
227 struct timer_list rtimer;
228
229 /* Statistics */
230 struct xfrm_stats stats;
231
232 struct xfrm_lifetime_cur curlft;
233 struct hrtimer mtimer;
234
235 struct xfrm_state_offload xso;
236
237 /* used to fix curlft->add_time when changing date */
238 long saved_tmo;
239
240 /* Last used time */
241 time64_t lastused;
242
243 struct page_frag xfrag;
244
245 /* Reference to data common to all the instances of this
246 * transformer. */
247 const struct xfrm_type *type;
248 struct xfrm_mode inner_mode;
249 struct xfrm_mode inner_mode_iaf;
250 struct xfrm_mode outer_mode;
251
252 const struct xfrm_type_offload *type_offload;
253
254 /* Security context */
255 struct xfrm_sec_ctx *security;
256
257 /* Private data of this transformer, format is opaque,
258 * interpreted by xfrm_type methods. */
259 void *data;
260};
261
262static inline struct net *xs_net(struct xfrm_state *x)
263{
264 return read_pnet(&x->xs_net);
265}
266
267/* xflags - make enum if more show up */
268#define XFRM_TIME_DEFER 1
269#define XFRM_SOFT_EXPIRE 2
270
271enum {
272 XFRM_STATE_VOID,
273 XFRM_STATE_ACQ,
274 XFRM_STATE_VALID,
275 XFRM_STATE_ERROR,
276 XFRM_STATE_EXPIRED,
277 XFRM_STATE_DEAD
278};
279
280/* callback structure passed from either netlink or pfkey */
281struct km_event {
282 union {
283 u32 hard;
284 u32 proto;
285 u32 byid;
286 u32 aevent;
287 u32 type;
288 } data;
289
290 u32 seq;
291 u32 portid;
292 u32 event;
293 struct net *net;
294};
295
296struct xfrm_replay {
297 void (*advance)(struct xfrm_state *x, __be32 net_seq);
298 int (*check)(struct xfrm_state *x,
299 struct sk_buff *skb,
300 __be32 net_seq);
301 int (*recheck)(struct xfrm_state *x,
302 struct sk_buff *skb,
303 __be32 net_seq);
304 void (*notify)(struct xfrm_state *x, int event);
305 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
306};
307
308struct xfrm_if_cb {
309 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
310 unsigned short family);
311};
312
313void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
314void xfrm_if_unregister_cb(void);
315
316struct net_device;
317struct xfrm_type;
318struct xfrm_dst;
319struct xfrm_policy_afinfo {
320 struct dst_ops *dst_ops;
321 struct dst_entry *(*dst_lookup)(struct net *net,
322 int tos, int oif,
323 const xfrm_address_t *saddr,
324 const xfrm_address_t *daddr,
325 u32 mark);
326 int (*get_saddr)(struct net *net, int oif,
327 xfrm_address_t *saddr,
328 xfrm_address_t *daddr,
329 u32 mark);
330 int (*fill_dst)(struct xfrm_dst *xdst,
331 struct net_device *dev,
332 const struct flowi *fl);
333 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
334};
335
336int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
337void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
338void km_policy_notify(struct xfrm_policy *xp, int dir,
339 const struct km_event *c);
340void km_state_notify(struct xfrm_state *x, const struct km_event *c);
341
342struct xfrm_tmpl;
343int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
344 struct xfrm_policy *pol);
345void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
346int __xfrm_state_delete(struct xfrm_state *x);
347
348struct xfrm_state_afinfo {
349 u8 family;
350 u8 proto;
351
352 const struct xfrm_type_offload *type_offload_esp;
353
354 const struct xfrm_type *type_esp;
355 const struct xfrm_type *type_ipip;
356 const struct xfrm_type *type_ipip6;
357 const struct xfrm_type *type_comp;
358 const struct xfrm_type *type_ah;
359 const struct xfrm_type *type_routing;
360 const struct xfrm_type *type_dstopts;
361
362 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
363 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
364 int (*extract_input)(struct xfrm_state *x,
365 struct sk_buff *skb);
366 int (*extract_output)(struct xfrm_state *x,
367 struct sk_buff *skb);
368 int (*transport_finish)(struct sk_buff *skb,
369 int async);
370 void (*local_error)(struct sk_buff *skb, u32 mtu);
371};
372
373int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
374int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
375struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
376struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
377
378struct xfrm_input_afinfo {
379 unsigned int family;
380 int (*callback)(struct sk_buff *skb, u8 protocol,
381 int err);
382};
383
384int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
385int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
386
387void xfrm_flush_gc(void);
388void xfrm_state_delete_tunnel(struct xfrm_state *x);
389
390struct xfrm_type {
391 char *description;
392 struct module *owner;
393 u8 proto;
394 u8 flags;
395#define XFRM_TYPE_NON_FRAGMENT 1
396#define XFRM_TYPE_REPLAY_PROT 2
397#define XFRM_TYPE_LOCAL_COADDR 4
398#define XFRM_TYPE_REMOTE_COADDR 8
399
400 int (*init_state)(struct xfrm_state *x);
401 void (*destructor)(struct xfrm_state *);
402 int (*input)(struct xfrm_state *, struct sk_buff *skb);
403 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
404 int (*reject)(struct xfrm_state *, struct sk_buff *,
405 const struct flowi *);
406 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
407};
408
409int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
410void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
411
412struct xfrm_type_offload {
413 char *description;
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
586int xfrm_register_km(struct xfrm_mgr *km);
587int 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) {
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) {
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#define XFRM_ESP_NO_TRAILER 64
1014#define XFRM_DEV_RESUME 128
1015
1016 __u32 status;
1017#define CRYPTO_SUCCESS 1
1018#define CRYPTO_GENERIC_ERROR 2
1019#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1020#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1021#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1022#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1023#define CRYPTO_INVALID_PACKET_SYNTAX 64
1024#define CRYPTO_INVALID_PROTOCOL 128
1025
1026 __u8 proto;
1027};
1028
1029struct sec_path {
1030 int len;
1031 int olen;
1032
1033 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1034 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1035};
1036
1037struct sec_path *secpath_set(struct sk_buff *skb);
1038
1039static inline void
1040secpath_reset(struct sk_buff *skb)
1041{
1042#ifdef CONFIG_XFRM
1043 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1044#endif
1045}
1046
1047static inline int
1048xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1049{
1050 switch (family) {
1051 case AF_INET:
1052 return addr->a4 == 0;
1053 case AF_INET6:
1054 return ipv6_addr_any(&addr->in6);
1055 }
1056 return 0;
1057}
1058
1059static inline int
1060__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1061{
1062 return (tmpl->saddr.a4 &&
1063 tmpl->saddr.a4 != x->props.saddr.a4);
1064}
1065
1066static inline int
1067__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1068{
1069 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1070 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1071}
1072
1073static inline int
1074xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1075{
1076 switch (family) {
1077 case AF_INET:
1078 return __xfrm4_state_addr_cmp(tmpl, x);
1079 case AF_INET6:
1080 return __xfrm6_state_addr_cmp(tmpl, x);
1081 }
1082 return !0;
1083}
1084
1085#ifdef CONFIG_XFRM
1086int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1087 unsigned short family);
1088
1089static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1090 struct sk_buff *skb,
1091 unsigned int family, int reverse)
1092{
1093 struct net *net = dev_net(skb->dev);
1094 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1095
1096 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1097 return __xfrm_policy_check(sk, ndir, skb, family);
1098
1099 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1100 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1101 __xfrm_policy_check(sk, ndir, skb, family);
1102}
1103
1104static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1105{
1106 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1107}
1108
1109static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1110{
1111 return xfrm_policy_check(sk, dir, skb, AF_INET);
1112}
1113
1114static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1115{
1116 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1117}
1118
1119static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1120 struct sk_buff *skb)
1121{
1122 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1123}
1124
1125static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1126 struct sk_buff *skb)
1127{
1128 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1129}
1130
1131int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1132 unsigned int family, int reverse);
1133
1134static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1135 unsigned int family)
1136{
1137 return __xfrm_decode_session(skb, fl, family, 0);
1138}
1139
1140static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1141 struct flowi *fl,
1142 unsigned int family)
1143{
1144 return __xfrm_decode_session(skb, fl, family, 1);
1145}
1146
1147int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1148
1149static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1150{
1151 struct net *net = dev_net(skb->dev);
1152
1153 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1154 (skb_dst(skb)->flags & DST_NOXFRM) ||
1155 __xfrm_route_forward(skb, family);
1156}
1157
1158static inline int xfrm4_route_forward(struct sk_buff *skb)
1159{
1160 return xfrm_route_forward(skb, AF_INET);
1161}
1162
1163static inline int xfrm6_route_forward(struct sk_buff *skb)
1164{
1165 return xfrm_route_forward(skb, AF_INET6);
1166}
1167
1168int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1169
1170static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1171{
1172 sk->sk_policy[0] = NULL;
1173 sk->sk_policy[1] = NULL;
1174 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1175 return __xfrm_sk_clone_policy(sk, osk);
1176 return 0;
1177}
1178
1179int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1180
1181static inline void xfrm_sk_free_policy(struct sock *sk)
1182{
1183 struct xfrm_policy *pol;
1184
1185 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1186 if (unlikely(pol != NULL)) {
1187 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1188 sk->sk_policy[0] = NULL;
1189 }
1190 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1191 if (unlikely(pol != NULL)) {
1192 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1193 sk->sk_policy[1] = NULL;
1194 }
1195}
1196
1197#else
1198
1199static inline void xfrm_sk_free_policy(struct sock *sk) {}
1200static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1201static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1202static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1203static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1204{
1205 return 1;
1206}
1207static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1208{
1209 return 1;
1210}
1211static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1212{
1213 return 1;
1214}
1215static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1216 struct flowi *fl,
1217 unsigned int family)
1218{
1219 return -ENOSYS;
1220}
1221static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1222 struct sk_buff *skb)
1223{
1224 return 1;
1225}
1226static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1227 struct sk_buff *skb)
1228{
1229 return 1;
1230}
1231#endif
1232
1233static __inline__
1234xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1235{
1236 switch (family){
1237 case AF_INET:
1238 return (xfrm_address_t *)&fl->u.ip4.daddr;
1239 case AF_INET6:
1240 return (xfrm_address_t *)&fl->u.ip6.daddr;
1241 }
1242 return NULL;
1243}
1244
1245static __inline__
1246xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1247{
1248 switch (family){
1249 case AF_INET:
1250 return (xfrm_address_t *)&fl->u.ip4.saddr;
1251 case AF_INET6:
1252 return (xfrm_address_t *)&fl->u.ip6.saddr;
1253 }
1254 return NULL;
1255}
1256
1257static __inline__
1258void xfrm_flowi_addr_get(const struct flowi *fl,
1259 xfrm_address_t *saddr, xfrm_address_t *daddr,
1260 unsigned short family)
1261{
1262 switch(family) {
1263 case AF_INET:
1264 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1265 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1266 break;
1267 case AF_INET6:
1268 saddr->in6 = fl->u.ip6.saddr;
1269 daddr->in6 = fl->u.ip6.daddr;
1270 break;
1271 }
1272}
1273
1274static __inline__ int
1275__xfrm4_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277{
1278 if (daddr->a4 == x->id.daddr.a4 &&
1279 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1280 return 1;
1281 return 0;
1282}
1283
1284static __inline__ int
1285__xfrm6_state_addr_check(const struct xfrm_state *x,
1286 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1287{
1288 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1289 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1290 ipv6_addr_any((struct in6_addr *)saddr) ||
1291 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1292 return 1;
1293 return 0;
1294}
1295
1296static __inline__ int
1297xfrm_state_addr_check(const struct xfrm_state *x,
1298 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1299 unsigned short family)
1300{
1301 switch (family) {
1302 case AF_INET:
1303 return __xfrm4_state_addr_check(x, daddr, saddr);
1304 case AF_INET6:
1305 return __xfrm6_state_addr_check(x, daddr, saddr);
1306 }
1307 return 0;
1308}
1309
1310static __inline__ int
1311xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1312 unsigned short family)
1313{
1314 switch (family) {
1315 case AF_INET:
1316 return __xfrm4_state_addr_check(x,
1317 (const xfrm_address_t *)&fl->u.ip4.daddr,
1318 (const xfrm_address_t *)&fl->u.ip4.saddr);
1319 case AF_INET6:
1320 return __xfrm6_state_addr_check(x,
1321 (const xfrm_address_t *)&fl->u.ip6.daddr,
1322 (const xfrm_address_t *)&fl->u.ip6.saddr);
1323 }
1324 return 0;
1325}
1326
1327static inline int xfrm_state_kern(const struct xfrm_state *x)
1328{
1329 return atomic_read(&x->tunnel_users);
1330}
1331
1332static inline bool xfrm_id_proto_valid(u8 proto)
1333{
1334 switch (proto) {
1335 case IPPROTO_AH:
1336 case IPPROTO_ESP:
1337 case IPPROTO_COMP:
1338#if IS_ENABLED(CONFIG_IPV6)
1339 case IPPROTO_ROUTING:
1340 case IPPROTO_DSTOPTS:
1341#endif
1342 return true;
1343 default:
1344 return false;
1345 }
1346}
1347
1348/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1349static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1350{
1351 return (!userproto || proto == userproto ||
1352 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1353 proto == IPPROTO_ESP ||
1354 proto == IPPROTO_COMP)));
1355}
1356
1357/*
1358 * xfrm algorithm information
1359 */
1360struct xfrm_algo_aead_info {
1361 char *geniv;
1362 u16 icv_truncbits;
1363};
1364
1365struct xfrm_algo_auth_info {
1366 u16 icv_truncbits;
1367 u16 icv_fullbits;
1368};
1369
1370struct xfrm_algo_encr_info {
1371 char *geniv;
1372 u16 blockbits;
1373 u16 defkeybits;
1374};
1375
1376struct xfrm_algo_comp_info {
1377 u16 threshold;
1378};
1379
1380struct xfrm_algo_desc {
1381 char *name;
1382 char *compat;
1383 u8 available:1;
1384 u8 pfkey_supported:1;
1385 union {
1386 struct xfrm_algo_aead_info aead;
1387 struct xfrm_algo_auth_info auth;
1388 struct xfrm_algo_encr_info encr;
1389 struct xfrm_algo_comp_info comp;
1390 } uinfo;
1391 struct sadb_alg desc;
1392};
1393
1394/* XFRM protocol handlers. */
1395struct xfrm4_protocol {
1396 int (*handler)(struct sk_buff *skb);
1397 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1398 int encap_type);
1399 int (*cb_handler)(struct sk_buff *skb, int err);
1400 int (*err_handler)(struct sk_buff *skb, u32 info);
1401
1402 struct xfrm4_protocol __rcu *next;
1403 int priority;
1404};
1405
1406struct xfrm6_protocol {
1407 int (*handler)(struct sk_buff *skb);
1408 int (*cb_handler)(struct sk_buff *skb, int err);
1409 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1410 u8 type, u8 code, int offset, __be32 info);
1411
1412 struct xfrm6_protocol __rcu *next;
1413 int priority;
1414};
1415
1416/* XFRM tunnel handlers. */
1417struct xfrm_tunnel {
1418 int (*handler)(struct sk_buff *skb);
1419 int (*err_handler)(struct sk_buff *skb, u32 info);
1420
1421 struct xfrm_tunnel __rcu *next;
1422 int priority;
1423};
1424
1425struct xfrm6_tunnel {
1426 int (*handler)(struct sk_buff *skb);
1427 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1428 u8 type, u8 code, int offset, __be32 info);
1429 struct xfrm6_tunnel __rcu *next;
1430 int priority;
1431};
1432
1433void xfrm_init(void);
1434void xfrm4_init(void);
1435int xfrm_state_init(struct net *net);
1436void xfrm_state_fini(struct net *net);
1437void xfrm4_state_init(void);
1438void xfrm4_protocol_init(void);
1439#ifdef CONFIG_XFRM
1440int xfrm6_init(void);
1441void xfrm6_fini(void);
1442int xfrm6_state_init(void);
1443void xfrm6_state_fini(void);
1444int xfrm6_protocol_init(void);
1445void xfrm6_protocol_fini(void);
1446#else
1447static inline int xfrm6_init(void)
1448{
1449 return 0;
1450}
1451static inline void xfrm6_fini(void)
1452{
1453 ;
1454}
1455#endif
1456
1457#ifdef CONFIG_XFRM_STATISTICS
1458int xfrm_proc_init(struct net *net);
1459void xfrm_proc_fini(struct net *net);
1460#endif
1461
1462int xfrm_sysctl_init(struct net *net);
1463#ifdef CONFIG_SYSCTL
1464void xfrm_sysctl_fini(struct net *net);
1465#else
1466static inline void xfrm_sysctl_fini(struct net *net)
1467{
1468}
1469#endif
1470
1471void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1472 struct xfrm_address_filter *filter);
1473int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1474 int (*func)(struct xfrm_state *, int, void*), void *);
1475void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1476struct xfrm_state *xfrm_state_alloc(struct net *net);
1477void xfrm_state_free(struct xfrm_state *x);
1478struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1479 const xfrm_address_t *saddr,
1480 const struct flowi *fl,
1481 struct xfrm_tmpl *tmpl,
1482 struct xfrm_policy *pol, int *err,
1483 unsigned short family, u32 if_id);
1484struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1485 xfrm_address_t *daddr,
1486 xfrm_address_t *saddr,
1487 unsigned short family,
1488 u8 mode, u8 proto, u32 reqid);
1489struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1490 unsigned short family);
1491int xfrm_state_check_expire(struct xfrm_state *x);
1492void xfrm_state_insert(struct xfrm_state *x);
1493int xfrm_state_add(struct xfrm_state *x);
1494int xfrm_state_update(struct xfrm_state *x);
1495struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1496 const xfrm_address_t *daddr, __be32 spi,
1497 u8 proto, unsigned short family);
1498struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1499 const xfrm_address_t *daddr,
1500 const xfrm_address_t *saddr,
1501 u8 proto,
1502 unsigned short family);
1503#ifdef CONFIG_XFRM_SUB_POLICY
1504void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1505 unsigned short family);
1506void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1507 unsigned short family);
1508#else
1509static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1510 int n, unsigned short family)
1511{
1512}
1513
1514static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1515 int n, unsigned short family)
1516{
1517}
1518#endif
1519
1520struct xfrmk_sadinfo {
1521 u32 sadhcnt; /* current hash bkts */
1522 u32 sadhmcnt; /* max allowed hash bkts */
1523 u32 sadcnt; /* current running count */
1524};
1525
1526struct xfrmk_spdinfo {
1527 u32 incnt;
1528 u32 outcnt;
1529 u32 fwdcnt;
1530 u32 inscnt;
1531 u32 outscnt;
1532 u32 fwdscnt;
1533 u32 spdhcnt;
1534 u32 spdhmcnt;
1535};
1536
1537struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1538int xfrm_state_delete(struct xfrm_state *x);
1539int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1540int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1541void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1542void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1543u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1544int xfrm_init_replay(struct xfrm_state *x);
1545u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1546int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1547int xfrm_init_state(struct xfrm_state *x);
1548int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1549int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1550int xfrm_trans_queue(struct sk_buff *skb,
1551 int (*finish)(struct net *, struct sock *,
1552 struct sk_buff *));
1553int xfrm_output_resume(struct sk_buff *skb, int err);
1554int xfrm_output(struct sock *sk, struct sk_buff *skb);
1555
1556#if IS_ENABLED(CONFIG_NET_PKTGEN)
1557int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1558#endif
1559
1560void xfrm_local_error(struct sk_buff *skb, int mtu);
1561int xfrm4_extract_header(struct sk_buff *skb);
1562int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1563int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1564 int encap_type);
1565int xfrm4_transport_finish(struct sk_buff *skb, int async);
1566int xfrm4_rcv(struct sk_buff *skb);
1567int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1568
1569static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1570{
1571 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1572 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1573 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1574 return xfrm_input(skb, nexthdr, spi, 0);
1575}
1576
1577int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1578int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1579int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1580int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1581int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1582int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1583int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1584void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1585int xfrm6_extract_header(struct sk_buff *skb);
1586int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1587int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1588 struct ip6_tnl *t);
1589int xfrm6_transport_finish(struct sk_buff *skb, int async);
1590int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1591int xfrm6_rcv(struct sk_buff *skb);
1592int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1593 xfrm_address_t *saddr, u8 proto);
1594void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1595int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1596int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1597int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1598int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1599__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1600__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1601int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1602int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1603int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1604int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1605 u8 **prevhdr);
1606
1607#ifdef CONFIG_XFRM
1608int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1609int xfrm_user_policy(struct sock *sk, int optname,
1610 u8 __user *optval, int optlen);
1611#else
1612static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1613{
1614 return -ENOPROTOOPT;
1615}
1616
1617static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1618{
1619 /* should not happen */
1620 kfree_skb(skb);
1621 return 0;
1622}
1623#endif
1624
1625struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1626 const xfrm_address_t *saddr,
1627 const xfrm_address_t *daddr,
1628 int family, u32 mark);
1629
1630struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1631
1632void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1633int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1634 int (*func)(struct xfrm_policy *, int, int, void*),
1635 void *);
1636void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1637int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1638struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1639 u8 type, int dir,
1640 struct xfrm_selector *sel,
1641 struct xfrm_sec_ctx *ctx, int delete,
1642 int *err);
1643struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1644 int dir, u32 id, int delete, int *err);
1645int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1646void xfrm_policy_hash_rebuild(struct net *net);
1647u32 xfrm_get_acqseq(void);
1648int verify_spi_info(u8 proto, u32 min, u32 max);
1649int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1650struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1651 u8 mode, u32 reqid, u32 if_id, u8 proto,
1652 const xfrm_address_t *daddr,
1653 const xfrm_address_t *saddr, int create,
1654 unsigned short family);
1655int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1656
1657#ifdef CONFIG_XFRM_MIGRATE
1658int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1659 const struct xfrm_migrate *m, int num_bundles,
1660 const struct xfrm_kmaddress *k,
1661 const struct xfrm_encap_tmpl *encap);
1662struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1663struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1664 struct xfrm_migrate *m,
1665 struct xfrm_encap_tmpl *encap);
1666int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1667 struct xfrm_migrate *m, int num_bundles,
1668 struct xfrm_kmaddress *k, struct net *net,
1669 struct xfrm_encap_tmpl *encap);
1670#endif
1671
1672int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1673void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1674int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1675 xfrm_address_t *addr);
1676
1677void xfrm_input_init(void);
1678int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1679
1680void xfrm_probe_algs(void);
1681int xfrm_count_pfkey_auth_supported(void);
1682int xfrm_count_pfkey_enc_supported(void);
1683struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1684struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1685struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1686struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1687struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1688struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1689struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1690struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1691struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1692 int probe);
1693
1694static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1695 const xfrm_address_t *b)
1696{
1697 return ipv6_addr_equal((const struct in6_addr *)a,
1698 (const struct in6_addr *)b);
1699}
1700
1701static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1702 const xfrm_address_t *b,
1703 sa_family_t family)
1704{
1705 switch (family) {
1706 default:
1707 case AF_INET:
1708 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1709 case AF_INET6:
1710 return xfrm6_addr_equal(a, b);
1711 }
1712}
1713
1714static inline int xfrm_policy_id2dir(u32 index)
1715{
1716 return index & 7;
1717}
1718
1719#ifdef CONFIG_XFRM
1720static inline int xfrm_aevent_is_on(struct net *net)
1721{
1722 struct sock *nlsk;
1723 int ret = 0;
1724
1725 rcu_read_lock();
1726 nlsk = rcu_dereference(net->xfrm.nlsk);
1727 if (nlsk)
1728 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1729 rcu_read_unlock();
1730 return ret;
1731}
1732
1733static inline int xfrm_acquire_is_on(struct net *net)
1734{
1735 struct sock *nlsk;
1736 int ret = 0;
1737
1738 rcu_read_lock();
1739 nlsk = rcu_dereference(net->xfrm.nlsk);
1740 if (nlsk)
1741 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1742 rcu_read_unlock();
1743
1744 return ret;
1745}
1746#endif
1747
1748static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1749{
1750 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1751}
1752
1753static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1754{
1755 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1756}
1757
1758static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1759{
1760 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1761}
1762
1763static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1764{
1765 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1766}
1767
1768#ifdef CONFIG_XFRM_MIGRATE
1769static inline int xfrm_replay_clone(struct xfrm_state *x,
1770 struct xfrm_state *orig)
1771{
1772 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1773 GFP_KERNEL);
1774 if (!x->replay_esn)
1775 return -ENOMEM;
1776
1777 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1778 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1779
1780 x->preplay_esn = kmemdup(x->replay_esn,
1781 xfrm_replay_state_esn_len(x->replay_esn),
1782 GFP_KERNEL);
1783 if (!x->preplay_esn) {
1784 kfree(x->replay_esn);
1785 return -ENOMEM;
1786 }
1787
1788 return 0;
1789}
1790
1791static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1792{
1793 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1794}
1795
1796
1797static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1798{
1799 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1800}
1801
1802static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1803{
1804 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1805}
1806
1807static inline void xfrm_states_put(struct xfrm_state **states, int n)
1808{
1809 int i;
1810 for (i = 0; i < n; i++)
1811 xfrm_state_put(*(states + i));
1812}
1813
1814static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1815{
1816 int i;
1817 for (i = 0; i < n; i++)
1818 xfrm_state_delete(*(states + i));
1819}
1820#endif
1821
1822#ifdef CONFIG_XFRM
1823static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1824{
1825 struct sec_path *sp = skb_sec_path(skb);
1826
1827 return sp->xvec[sp->len - 1];
1828}
1829#endif
1830
1831static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1832{
1833#ifdef CONFIG_XFRM
1834 struct sec_path *sp = skb_sec_path(skb);
1835
1836 if (!sp || !sp->olen || sp->len != sp->olen)
1837 return NULL;
1838
1839 return &sp->ovec[sp->olen - 1];
1840#else
1841 return NULL;
1842#endif
1843}
1844
1845void __init xfrm_dev_init(void);
1846
1847#ifdef CONFIG_XFRM_OFFLOAD
1848void xfrm_dev_resume(struct sk_buff *skb);
1849void xfrm_dev_backlog(struct softnet_data *sd);
1850struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1851int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1852 struct xfrm_user_offload *xuo);
1853bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1854
1855static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1856{
1857 struct xfrm_state_offload *xso = &x->xso;
1858
1859 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1860 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1861}
1862
1863static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1864{
1865 struct xfrm_state *x = dst->xfrm;
1866 struct xfrm_dst *xdst;
1867
1868 if (!x || !x->type_offload)
1869 return false;
1870
1871 xdst = (struct xfrm_dst *) dst;
1872 if (!x->xso.offload_handle && !xdst->child->xfrm)
1873 return true;
1874 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1875 !xdst->child->xfrm)
1876 return true;
1877
1878 return false;
1879}
1880
1881static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1882{
1883 struct xfrm_state_offload *xso = &x->xso;
1884
1885 if (xso->dev)
1886 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1887}
1888
1889static inline void xfrm_dev_state_free(struct xfrm_state *x)
1890{
1891 struct xfrm_state_offload *xso = &x->xso;
1892 struct net_device *dev = xso->dev;
1893
1894 if (dev && dev->xfrmdev_ops) {
1895 if (dev->xfrmdev_ops->xdo_dev_state_free)
1896 dev->xfrmdev_ops->xdo_dev_state_free(x);
1897 xso->dev = NULL;
1898 dev_put(dev);
1899 }
1900}
1901#else
1902static inline void xfrm_dev_resume(struct sk_buff *skb)
1903{
1904}
1905
1906static inline void xfrm_dev_backlog(struct softnet_data *sd)
1907{
1908}
1909
1910static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1911{
1912 return skb;
1913}
1914
1915static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1916{
1917 return 0;
1918}
1919
1920static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1921{
1922}
1923
1924static inline void xfrm_dev_state_free(struct xfrm_state *x)
1925{
1926}
1927
1928static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1929{
1930 return false;
1931}
1932
1933static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1934{
1935}
1936
1937static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1938{
1939 return false;
1940}
1941#endif
1942
1943static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1944{
1945 if (attrs[XFRMA_MARK])
1946 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1947 else
1948 m->v = m->m = 0;
1949
1950 return m->v & m->m;
1951}
1952
1953static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1954{
1955 int ret = 0;
1956
1957 if (m->m | m->v)
1958 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1959 return ret;
1960}
1961
1962static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1963{
1964 struct xfrm_mark *m = &x->props.smark;
1965
1966 return (m->v & m->m) | (mark & ~m->m);
1967}
1968
1969static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1970{
1971 int ret = 0;
1972
1973 if (if_id)
1974 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1975 return ret;
1976}
1977
1978static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1979 unsigned int family)
1980{
1981 bool tunnel = false;
1982
1983 switch(family) {
1984 case AF_INET:
1985 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1986 tunnel = true;
1987 break;
1988 case AF_INET6:
1989 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1990 tunnel = true;
1991 break;
1992 }
1993 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1994 return -EINVAL;
1995
1996 return 0;
1997}
1998#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
141struct xfrm_dev_offload {
142 struct net_device *dev;
143 netdevice_tracker dev_tracker;
144 struct net_device *real_dev;
145 unsigned long offload_handle;
146 u8 dir : 2;
147 u8 type : 2;
148};
149
150struct xfrm_mode {
151 u8 encap;
152 u8 family;
153 u8 flags;
154};
155
156/* Flags for xfrm_mode. */
157enum {
158 XFRM_MODE_FLAG_TUNNEL = 1,
159};
160
161enum xfrm_replay_mode {
162 XFRM_REPLAY_MODE_LEGACY,
163 XFRM_REPLAY_MODE_BMP,
164 XFRM_REPLAY_MODE_ESN,
165};
166
167/* Full description of state of transformer. */
168struct xfrm_state {
169 possible_net_t xs_net;
170 union {
171 struct hlist_node gclist;
172 struct hlist_node bydst;
173 };
174 struct hlist_node bysrc;
175 struct hlist_node byspi;
176 struct hlist_node byseq;
177
178 refcount_t refcnt;
179 spinlock_t lock;
180
181 struct xfrm_id id;
182 struct xfrm_selector sel;
183 struct xfrm_mark mark;
184 u32 if_id;
185 u32 tfcpad;
186
187 u32 genid;
188
189 /* Key manager bits */
190 struct xfrm_state_walk km;
191
192 /* Parameters of this state. */
193 struct {
194 u32 reqid;
195 u8 mode;
196 u8 replay_window;
197 u8 aalgo, ealgo, calgo;
198 u8 flags;
199 u16 family;
200 xfrm_address_t saddr;
201 int header_len;
202 int trailer_len;
203 u32 extra_flags;
204 struct xfrm_mark smark;
205 } props;
206
207 struct xfrm_lifetime_cfg lft;
208
209 /* Data for transformer */
210 struct xfrm_algo_auth *aalg;
211 struct xfrm_algo *ealg;
212 struct xfrm_algo *calg;
213 struct xfrm_algo_aead *aead;
214 const char *geniv;
215
216 /* mapping change rate limiting */
217 __be16 new_mapping_sport;
218 u32 new_mapping; /* seconds */
219 u32 mapping_maxage; /* seconds for input SA */
220
221 /* Data for encapsulator */
222 struct xfrm_encap_tmpl *encap;
223 struct sock __rcu *encap_sk;
224
225 /* Data for care-of address */
226 xfrm_address_t *coaddr;
227
228 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
229 struct xfrm_state *tunnel;
230
231 /* If a tunnel, number of users + 1 */
232 atomic_t tunnel_users;
233
234 /* State for replay detection */
235 struct xfrm_replay_state replay;
236 struct xfrm_replay_state_esn *replay_esn;
237
238 /* Replay detection state at the time we sent the last notification */
239 struct xfrm_replay_state preplay;
240 struct xfrm_replay_state_esn *preplay_esn;
241
242 /* replay detection mode */
243 enum xfrm_replay_mode repl_mode;
244 /* internal flag that only holds state for delayed aevent at the
245 * moment
246 */
247 u32 xflags;
248
249 /* Replay detection notification settings */
250 u32 replay_maxage;
251 u32 replay_maxdiff;
252
253 /* Replay detection notification timer */
254 struct timer_list rtimer;
255
256 /* Statistics */
257 struct xfrm_stats stats;
258
259 struct xfrm_lifetime_cur curlft;
260 struct hrtimer mtimer;
261
262 struct xfrm_dev_offload xso;
263
264 /* used to fix curlft->add_time when changing date */
265 long saved_tmo;
266
267 /* Last used time */
268 time64_t lastused;
269
270 struct page_frag xfrag;
271
272 /* Reference to data common to all the instances of this
273 * transformer. */
274 const struct xfrm_type *type;
275 struct xfrm_mode inner_mode;
276 struct xfrm_mode inner_mode_iaf;
277 struct xfrm_mode outer_mode;
278
279 const struct xfrm_type_offload *type_offload;
280
281 /* Security context */
282 struct xfrm_sec_ctx *security;
283
284 /* Private data of this transformer, format is opaque,
285 * interpreted by xfrm_type methods. */
286 void *data;
287};
288
289static inline struct net *xs_net(struct xfrm_state *x)
290{
291 return read_pnet(&x->xs_net);
292}
293
294/* xflags - make enum if more show up */
295#define XFRM_TIME_DEFER 1
296#define XFRM_SOFT_EXPIRE 2
297
298enum {
299 XFRM_STATE_VOID,
300 XFRM_STATE_ACQ,
301 XFRM_STATE_VALID,
302 XFRM_STATE_ERROR,
303 XFRM_STATE_EXPIRED,
304 XFRM_STATE_DEAD
305};
306
307/* callback structure passed from either netlink or pfkey */
308struct km_event {
309 union {
310 u32 hard;
311 u32 proto;
312 u32 byid;
313 u32 aevent;
314 u32 type;
315 } data;
316
317 u32 seq;
318 u32 portid;
319 u32 event;
320 struct net *net;
321};
322
323struct xfrm_if_decode_session_result {
324 struct net *net;
325 u32 if_id;
326};
327
328struct xfrm_if_cb {
329 bool (*decode_session)(struct sk_buff *skb,
330 unsigned short family,
331 struct xfrm_if_decode_session_result *res);
332};
333
334void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
335void xfrm_if_unregister_cb(void);
336
337struct net_device;
338struct xfrm_type;
339struct xfrm_dst;
340struct xfrm_policy_afinfo {
341 struct dst_ops *dst_ops;
342 struct dst_entry *(*dst_lookup)(struct net *net,
343 int tos, int oif,
344 const xfrm_address_t *saddr,
345 const xfrm_address_t *daddr,
346 u32 mark);
347 int (*get_saddr)(struct net *net, int oif,
348 xfrm_address_t *saddr,
349 xfrm_address_t *daddr,
350 u32 mark);
351 int (*fill_dst)(struct xfrm_dst *xdst,
352 struct net_device *dev,
353 const struct flowi *fl);
354 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
355};
356
357int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
358void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
359void km_policy_notify(struct xfrm_policy *xp, int dir,
360 const struct km_event *c);
361void km_state_notify(struct xfrm_state *x, const struct km_event *c);
362
363struct xfrm_tmpl;
364int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
365 struct xfrm_policy *pol);
366void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
367int __xfrm_state_delete(struct xfrm_state *x);
368
369struct xfrm_state_afinfo {
370 u8 family;
371 u8 proto;
372
373 const struct xfrm_type_offload *type_offload_esp;
374
375 const struct xfrm_type *type_esp;
376 const struct xfrm_type *type_ipip;
377 const struct xfrm_type *type_ipip6;
378 const struct xfrm_type *type_comp;
379 const struct xfrm_type *type_ah;
380 const struct xfrm_type *type_routing;
381 const struct xfrm_type *type_dstopts;
382
383 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
384 int (*transport_finish)(struct sk_buff *skb,
385 int async);
386 void (*local_error)(struct sk_buff *skb, u32 mtu);
387};
388
389int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
390int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
391struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
392struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
393
394struct xfrm_input_afinfo {
395 u8 family;
396 bool is_ipip;
397 int (*callback)(struct sk_buff *skb, u8 protocol,
398 int err);
399};
400
401int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
402int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
403
404void xfrm_flush_gc(void);
405void xfrm_state_delete_tunnel(struct xfrm_state *x);
406
407struct xfrm_type {
408 struct module *owner;
409 u8 proto;
410 u8 flags;
411#define XFRM_TYPE_NON_FRAGMENT 1
412#define XFRM_TYPE_REPLAY_PROT 2
413#define XFRM_TYPE_LOCAL_COADDR 4
414#define XFRM_TYPE_REMOTE_COADDR 8
415
416 int (*init_state)(struct xfrm_state *x,
417 struct netlink_ext_ack *extack);
418 void (*destructor)(struct xfrm_state *);
419 int (*input)(struct xfrm_state *, struct sk_buff *skb);
420 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
421 int (*reject)(struct xfrm_state *, struct sk_buff *,
422 const struct flowi *);
423};
424
425int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
426void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
427
428struct xfrm_type_offload {
429 struct module *owner;
430 u8 proto;
431 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
432 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
433 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
434};
435
436int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
437void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
438
439static inline int xfrm_af2proto(unsigned int family)
440{
441 switch(family) {
442 case AF_INET:
443 return IPPROTO_IPIP;
444 case AF_INET6:
445 return IPPROTO_IPV6;
446 default:
447 return 0;
448 }
449}
450
451static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
452{
453 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
454 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
455 return &x->inner_mode;
456 else
457 return &x->inner_mode_iaf;
458}
459
460struct xfrm_tmpl {
461/* id in template is interpreted as:
462 * daddr - destination of tunnel, may be zero for transport mode.
463 * spi - zero to acquire spi. Not zero if spi is static, then
464 * daddr must be fixed too.
465 * proto - AH/ESP/IPCOMP
466 */
467 struct xfrm_id id;
468
469/* Source address of tunnel. Ignored, if it is not a tunnel. */
470 xfrm_address_t saddr;
471
472 unsigned short encap_family;
473
474 u32 reqid;
475
476/* Mode: transport, tunnel etc. */
477 u8 mode;
478
479/* Sharing mode: unique, this session only, this user only etc. */
480 u8 share;
481
482/* May skip this transfomration if no SA is found */
483 u8 optional;
484
485/* Skip aalgos/ealgos/calgos checks. */
486 u8 allalgs;
487
488/* Bit mask of algos allowed for acquisition */
489 u32 aalgos;
490 u32 ealgos;
491 u32 calgos;
492};
493
494#define XFRM_MAX_DEPTH 6
495#define XFRM_MAX_OFFLOAD_DEPTH 1
496
497struct xfrm_policy_walk_entry {
498 struct list_head all;
499 u8 dead;
500};
501
502struct xfrm_policy_walk {
503 struct xfrm_policy_walk_entry walk;
504 u8 type;
505 u32 seq;
506};
507
508struct xfrm_policy_queue {
509 struct sk_buff_head hold_queue;
510 struct timer_list hold_timer;
511 unsigned long timeout;
512};
513
514struct xfrm_policy {
515 possible_net_t xp_net;
516 struct hlist_node bydst;
517 struct hlist_node byidx;
518
519 /* This lock only affects elements except for entry. */
520 rwlock_t lock;
521 refcount_t refcnt;
522 u32 pos;
523 struct timer_list timer;
524
525 atomic_t genid;
526 u32 priority;
527 u32 index;
528 u32 if_id;
529 struct xfrm_mark mark;
530 struct xfrm_selector selector;
531 struct xfrm_lifetime_cfg lft;
532 struct xfrm_lifetime_cur curlft;
533 struct xfrm_policy_walk_entry walk;
534 struct xfrm_policy_queue polq;
535 bool bydst_reinsert;
536 u8 type;
537 u8 action;
538 u8 flags;
539 u8 xfrm_nr;
540 u16 family;
541 struct xfrm_sec_ctx *security;
542 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
543 struct hlist_node bydst_inexact_list;
544 struct rcu_head rcu;
545
546 struct xfrm_dev_offload xdo;
547};
548
549static inline struct net *xp_net(const struct xfrm_policy *xp)
550{
551 return read_pnet(&xp->xp_net);
552}
553
554struct xfrm_kmaddress {
555 xfrm_address_t local;
556 xfrm_address_t remote;
557 u32 reserved;
558 u16 family;
559};
560
561struct xfrm_migrate {
562 xfrm_address_t old_daddr;
563 xfrm_address_t old_saddr;
564 xfrm_address_t new_daddr;
565 xfrm_address_t new_saddr;
566 u8 proto;
567 u8 mode;
568 u16 reserved;
569 u32 reqid;
570 u16 old_family;
571 u16 new_family;
572};
573
574#define XFRM_KM_TIMEOUT 30
575/* what happened */
576#define XFRM_REPLAY_UPDATE XFRM_AE_CR
577#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
578
579/* default aevent timeout in units of 100ms */
580#define XFRM_AE_ETIME 10
581/* Async Event timer multiplier */
582#define XFRM_AE_ETH_M 10
583/* default seq threshold size */
584#define XFRM_AE_SEQT_SIZE 2
585
586struct xfrm_mgr {
587 struct list_head list;
588 int (*notify)(struct xfrm_state *x, const struct km_event *c);
589 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
590 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
591 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
592 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
593 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
594 int (*migrate)(const struct xfrm_selector *sel,
595 u8 dir, u8 type,
596 const struct xfrm_migrate *m,
597 int num_bundles,
598 const struct xfrm_kmaddress *k,
599 const struct xfrm_encap_tmpl *encap);
600 bool (*is_alive)(const struct km_event *c);
601};
602
603void xfrm_register_km(struct xfrm_mgr *km);
604void xfrm_unregister_km(struct xfrm_mgr *km);
605
606struct xfrm_tunnel_skb_cb {
607 union {
608 struct inet_skb_parm h4;
609 struct inet6_skb_parm h6;
610 } header;
611
612 union {
613 struct ip_tunnel *ip4;
614 struct ip6_tnl *ip6;
615 } tunnel;
616};
617
618#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
619
620/*
621 * This structure is used for the duration where packets are being
622 * transformed by IPsec. As soon as the packet leaves IPsec the
623 * area beyond the generic IP part may be overwritten.
624 */
625struct xfrm_skb_cb {
626 struct xfrm_tunnel_skb_cb header;
627
628 /* Sequence number for replay protection. */
629 union {
630 struct {
631 __u32 low;
632 __u32 hi;
633 } output;
634 struct {
635 __be32 low;
636 __be32 hi;
637 } input;
638 } seq;
639};
640
641#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
642
643/*
644 * This structure is used by the afinfo prepare_input/prepare_output functions
645 * to transmit header information to the mode input/output functions.
646 */
647struct xfrm_mode_skb_cb {
648 struct xfrm_tunnel_skb_cb header;
649
650 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
651 __be16 id;
652 __be16 frag_off;
653
654 /* IP header length (excluding options or extension headers). */
655 u8 ihl;
656
657 /* TOS for IPv4, class for IPv6. */
658 u8 tos;
659
660 /* TTL for IPv4, hop limitfor IPv6. */
661 u8 ttl;
662
663 /* Protocol for IPv4, NH for IPv6. */
664 u8 protocol;
665
666 /* Option length for IPv4, zero for IPv6. */
667 u8 optlen;
668
669 /* Used by IPv6 only, zero for IPv4. */
670 u8 flow_lbl[3];
671};
672
673#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
674
675/*
676 * This structure is used by the input processing to locate the SPI and
677 * related information.
678 */
679struct xfrm_spi_skb_cb {
680 struct xfrm_tunnel_skb_cb header;
681
682 unsigned int daddroff;
683 unsigned int family;
684 __be32 seq;
685};
686
687#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
688
689#ifdef CONFIG_AUDITSYSCALL
690static inline struct audit_buffer *xfrm_audit_start(const char *op)
691{
692 struct audit_buffer *audit_buf = NULL;
693
694 if (audit_enabled == AUDIT_OFF)
695 return NULL;
696 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
697 AUDIT_MAC_IPSEC_EVENT);
698 if (audit_buf == NULL)
699 return NULL;
700 audit_log_format(audit_buf, "op=%s", op);
701 return audit_buf;
702}
703
704static inline void xfrm_audit_helper_usrinfo(bool task_valid,
705 struct audit_buffer *audit_buf)
706{
707 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
708 audit_get_loginuid(current) :
709 INVALID_UID);
710 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
711 AUDIT_SID_UNSET;
712
713 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
714 audit_log_task_context(audit_buf);
715}
716
717void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
718void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
719 bool task_valid);
720void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
721void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
722void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
723 struct sk_buff *skb);
724void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
725 __be32 net_seq);
726void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
727void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
728 __be32 net_seq);
729void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
730 u8 proto);
731#else
732
733static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
734 bool task_valid)
735{
736}
737
738static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
739 bool task_valid)
740{
741}
742
743static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
744 bool task_valid)
745{
746}
747
748static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
749 bool task_valid)
750{
751}
752
753static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
754 struct sk_buff *skb)
755{
756}
757
758static inline void xfrm_audit_state_replay(struct xfrm_state *x,
759 struct sk_buff *skb, __be32 net_seq)
760{
761}
762
763static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
764 u16 family)
765{
766}
767
768static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
769 __be32 net_spi, __be32 net_seq)
770{
771}
772
773static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
774 struct sk_buff *skb, u8 proto)
775{
776}
777#endif /* CONFIG_AUDITSYSCALL */
778
779static inline void xfrm_pol_hold(struct xfrm_policy *policy)
780{
781 if (likely(policy != NULL))
782 refcount_inc(&policy->refcnt);
783}
784
785void xfrm_policy_destroy(struct xfrm_policy *policy);
786
787static inline void xfrm_pol_put(struct xfrm_policy *policy)
788{
789 if (refcount_dec_and_test(&policy->refcnt))
790 xfrm_policy_destroy(policy);
791}
792
793static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
794{
795 int i;
796 for (i = npols - 1; i >= 0; --i)
797 xfrm_pol_put(pols[i]);
798}
799
800void __xfrm_state_destroy(struct xfrm_state *, bool);
801
802static inline void __xfrm_state_put(struct xfrm_state *x)
803{
804 refcount_dec(&x->refcnt);
805}
806
807static inline void xfrm_state_put(struct xfrm_state *x)
808{
809 if (refcount_dec_and_test(&x->refcnt))
810 __xfrm_state_destroy(x, false);
811}
812
813static inline void xfrm_state_put_sync(struct xfrm_state *x)
814{
815 if (refcount_dec_and_test(&x->refcnt))
816 __xfrm_state_destroy(x, true);
817}
818
819static inline void xfrm_state_hold(struct xfrm_state *x)
820{
821 refcount_inc(&x->refcnt);
822}
823
824static inline bool addr_match(const void *token1, const void *token2,
825 unsigned int prefixlen)
826{
827 const __be32 *a1 = token1;
828 const __be32 *a2 = token2;
829 unsigned int pdw;
830 unsigned int pbi;
831
832 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
833 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
834
835 if (pdw)
836 if (memcmp(a1, a2, pdw << 2))
837 return false;
838
839 if (pbi) {
840 __be32 mask;
841
842 mask = htonl((0xffffffff) << (32 - pbi));
843
844 if ((a1[pdw] ^ a2[pdw]) & mask)
845 return false;
846 }
847
848 return true;
849}
850
851static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
852{
853 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
854 if (sizeof(long) == 4 && prefixlen == 0)
855 return true;
856 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
857}
858
859static __inline__
860__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
861{
862 __be16 port;
863 switch(fl->flowi_proto) {
864 case IPPROTO_TCP:
865 case IPPROTO_UDP:
866 case IPPROTO_UDPLITE:
867 case IPPROTO_SCTP:
868 port = uli->ports.sport;
869 break;
870 case IPPROTO_ICMP:
871 case IPPROTO_ICMPV6:
872 port = htons(uli->icmpt.type);
873 break;
874 case IPPROTO_MH:
875 port = htons(uli->mht.type);
876 break;
877 case IPPROTO_GRE:
878 port = htons(ntohl(uli->gre_key) >> 16);
879 break;
880 default:
881 port = 0; /*XXX*/
882 }
883 return port;
884}
885
886static __inline__
887__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
888{
889 __be16 port;
890 switch(fl->flowi_proto) {
891 case IPPROTO_TCP:
892 case IPPROTO_UDP:
893 case IPPROTO_UDPLITE:
894 case IPPROTO_SCTP:
895 port = uli->ports.dport;
896 break;
897 case IPPROTO_ICMP:
898 case IPPROTO_ICMPV6:
899 port = htons(uli->icmpt.code);
900 break;
901 case IPPROTO_GRE:
902 port = htons(ntohl(uli->gre_key) & 0xffff);
903 break;
904 default:
905 port = 0; /*XXX*/
906 }
907 return port;
908}
909
910bool xfrm_selector_match(const struct xfrm_selector *sel,
911 const struct flowi *fl, unsigned short family);
912
913#ifdef CONFIG_SECURITY_NETWORK_XFRM
914/* If neither has a context --> match
915 * Otherwise, both must have a context and the sids, doi, alg must match
916 */
917static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
918{
919 return ((!s1 && !s2) ||
920 (s1 && s2 &&
921 (s1->ctx_sid == s2->ctx_sid) &&
922 (s1->ctx_doi == s2->ctx_doi) &&
923 (s1->ctx_alg == s2->ctx_alg)));
924}
925#else
926static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
927{
928 return true;
929}
930#endif
931
932/* A struct encoding bundle of transformations to apply to some set of flow.
933 *
934 * xdst->child points to the next element of bundle.
935 * dst->xfrm points to an instanse of transformer.
936 *
937 * Due to unfortunate limitations of current routing cache, which we
938 * have no time to fix, it mirrors struct rtable and bound to the same
939 * routing key, including saddr,daddr. However, we can have many of
940 * bundles differing by session id. All the bundles grow from a parent
941 * policy rule.
942 */
943struct xfrm_dst {
944 union {
945 struct dst_entry dst;
946 struct rtable rt;
947 struct rt6_info rt6;
948 } u;
949 struct dst_entry *route;
950 struct dst_entry *child;
951 struct dst_entry *path;
952 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
953 int num_pols, num_xfrms;
954 u32 xfrm_genid;
955 u32 policy_genid;
956 u32 route_mtu_cached;
957 u32 child_mtu_cached;
958 u32 route_cookie;
959 u32 path_cookie;
960};
961
962static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
963{
964#ifdef CONFIG_XFRM
965 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
966 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
967
968 return xdst->path;
969 }
970#endif
971 return (struct dst_entry *) dst;
972}
973
974static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
975{
976#ifdef CONFIG_XFRM
977 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
978 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
979 return xdst->child;
980 }
981#endif
982 return NULL;
983}
984
985#ifdef CONFIG_XFRM
986static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
987{
988 xdst->child = child;
989}
990
991static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
992{
993 xfrm_pols_put(xdst->pols, xdst->num_pols);
994 dst_release(xdst->route);
995 if (likely(xdst->u.dst.xfrm))
996 xfrm_state_put(xdst->u.dst.xfrm);
997}
998#endif
999
1000void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1001
1002struct xfrm_if_parms {
1003 int link; /* ifindex of underlying L2 interface */
1004 u32 if_id; /* interface identifyer */
1005 bool collect_md;
1006};
1007
1008struct xfrm_if {
1009 struct xfrm_if __rcu *next; /* next interface in list */
1010 struct net_device *dev; /* virtual device associated with interface */
1011 struct net *net; /* netns for packet i/o */
1012 struct xfrm_if_parms p; /* interface parms */
1013
1014 struct gro_cells gro_cells;
1015};
1016
1017struct xfrm_offload {
1018 /* Output sequence number for replay protection on offloading. */
1019 struct {
1020 __u32 low;
1021 __u32 hi;
1022 } seq;
1023
1024 __u32 flags;
1025#define SA_DELETE_REQ 1
1026#define CRYPTO_DONE 2
1027#define CRYPTO_NEXT_DONE 4
1028#define CRYPTO_FALLBACK 8
1029#define XFRM_GSO_SEGMENT 16
1030#define XFRM_GRO 32
1031/* 64 is free */
1032#define XFRM_DEV_RESUME 128
1033#define XFRM_XMIT 256
1034
1035 __u32 status;
1036#define CRYPTO_SUCCESS 1
1037#define CRYPTO_GENERIC_ERROR 2
1038#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1039#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1040#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1041#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1042#define CRYPTO_INVALID_PACKET_SYNTAX 64
1043#define CRYPTO_INVALID_PROTOCOL 128
1044
1045 __u8 proto;
1046 __u8 inner_ipproto;
1047};
1048
1049struct sec_path {
1050 int len;
1051 int olen;
1052
1053 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1054 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1055};
1056
1057struct sec_path *secpath_set(struct sk_buff *skb);
1058
1059static inline void
1060secpath_reset(struct sk_buff *skb)
1061{
1062#ifdef CONFIG_XFRM
1063 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1064#endif
1065}
1066
1067static inline int
1068xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1069{
1070 switch (family) {
1071 case AF_INET:
1072 return addr->a4 == 0;
1073 case AF_INET6:
1074 return ipv6_addr_any(&addr->in6);
1075 }
1076 return 0;
1077}
1078
1079static inline int
1080__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1081{
1082 return (tmpl->saddr.a4 &&
1083 tmpl->saddr.a4 != x->props.saddr.a4);
1084}
1085
1086static inline int
1087__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1088{
1089 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1090 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1091}
1092
1093static inline int
1094xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1095{
1096 switch (family) {
1097 case AF_INET:
1098 return __xfrm4_state_addr_cmp(tmpl, x);
1099 case AF_INET6:
1100 return __xfrm6_state_addr_cmp(tmpl, x);
1101 }
1102 return !0;
1103}
1104
1105#ifdef CONFIG_XFRM
1106static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1107{
1108 struct sec_path *sp = skb_sec_path(skb);
1109
1110 return sp->xvec[sp->len - 1];
1111}
1112#endif
1113
1114static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1115{
1116#ifdef CONFIG_XFRM
1117 struct sec_path *sp = skb_sec_path(skb);
1118
1119 if (!sp || !sp->olen || sp->len != sp->olen)
1120 return NULL;
1121
1122 return &sp->ovec[sp->olen - 1];
1123#else
1124 return NULL;
1125#endif
1126}
1127
1128#ifdef CONFIG_XFRM
1129int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1130 unsigned short family);
1131
1132static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1133 int dir)
1134{
1135 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1136 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1137
1138 return false;
1139}
1140
1141static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1142 int dir, unsigned short family)
1143{
1144 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1145 /* same dst may be used for traffic originating from
1146 * devices with different policy settings.
1147 */
1148 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1149 }
1150 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1151}
1152
1153static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1154 struct sk_buff *skb,
1155 unsigned int family, int reverse)
1156{
1157 struct net *net = dev_net(skb->dev);
1158 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1159 struct xfrm_offload *xo = xfrm_offload(skb);
1160 struct xfrm_state *x;
1161
1162 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1163 return __xfrm_policy_check(sk, ndir, skb, family);
1164
1165 if (xo) {
1166 x = xfrm_input_state(skb);
1167 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1168 return (xo->flags & CRYPTO_DONE) &&
1169 (xo->status & CRYPTO_SUCCESS);
1170 }
1171
1172 return __xfrm_check_nopolicy(net, skb, dir) ||
1173 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1174 __xfrm_policy_check(sk, ndir, skb, family);
1175}
1176
1177static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1178{
1179 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1180}
1181
1182static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1183{
1184 return xfrm_policy_check(sk, dir, skb, AF_INET);
1185}
1186
1187static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1188{
1189 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1190}
1191
1192static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1193 struct sk_buff *skb)
1194{
1195 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1196}
1197
1198static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1199 struct sk_buff *skb)
1200{
1201 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1202}
1203
1204int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1205 unsigned int family, int reverse);
1206
1207static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1208 unsigned int family)
1209{
1210 return __xfrm_decode_session(skb, fl, family, 0);
1211}
1212
1213static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1214 struct flowi *fl,
1215 unsigned int family)
1216{
1217 return __xfrm_decode_session(skb, fl, family, 1);
1218}
1219
1220int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1221
1222static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1223{
1224 struct net *net = dev_net(skb->dev);
1225
1226 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1227 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1228 return true;
1229
1230 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1231 __xfrm_route_forward(skb, family);
1232}
1233
1234static inline int xfrm4_route_forward(struct sk_buff *skb)
1235{
1236 return xfrm_route_forward(skb, AF_INET);
1237}
1238
1239static inline int xfrm6_route_forward(struct sk_buff *skb)
1240{
1241 return xfrm_route_forward(skb, AF_INET6);
1242}
1243
1244int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1245
1246static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1247{
1248 if (!sk_fullsock(osk))
1249 return 0;
1250 sk->sk_policy[0] = NULL;
1251 sk->sk_policy[1] = NULL;
1252 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1253 return __xfrm_sk_clone_policy(sk, osk);
1254 return 0;
1255}
1256
1257int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1258
1259static inline void xfrm_sk_free_policy(struct sock *sk)
1260{
1261 struct xfrm_policy *pol;
1262
1263 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1264 if (unlikely(pol != NULL)) {
1265 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1266 sk->sk_policy[0] = NULL;
1267 }
1268 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1269 if (unlikely(pol != NULL)) {
1270 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1271 sk->sk_policy[1] = NULL;
1272 }
1273}
1274
1275#else
1276
1277static inline void xfrm_sk_free_policy(struct sock *sk) {}
1278static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1279static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1280static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1281static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1282{
1283 return 1;
1284}
1285static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1286{
1287 return 1;
1288}
1289static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1290{
1291 return 1;
1292}
1293static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1294 struct flowi *fl,
1295 unsigned int family)
1296{
1297 return -ENOSYS;
1298}
1299static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1300 struct sk_buff *skb)
1301{
1302 return 1;
1303}
1304static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1305 struct sk_buff *skb)
1306{
1307 return 1;
1308}
1309#endif
1310
1311static __inline__
1312xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1313{
1314 switch (family){
1315 case AF_INET:
1316 return (xfrm_address_t *)&fl->u.ip4.daddr;
1317 case AF_INET6:
1318 return (xfrm_address_t *)&fl->u.ip6.daddr;
1319 }
1320 return NULL;
1321}
1322
1323static __inline__
1324xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1325{
1326 switch (family){
1327 case AF_INET:
1328 return (xfrm_address_t *)&fl->u.ip4.saddr;
1329 case AF_INET6:
1330 return (xfrm_address_t *)&fl->u.ip6.saddr;
1331 }
1332 return NULL;
1333}
1334
1335static __inline__
1336void xfrm_flowi_addr_get(const struct flowi *fl,
1337 xfrm_address_t *saddr, xfrm_address_t *daddr,
1338 unsigned short family)
1339{
1340 switch(family) {
1341 case AF_INET:
1342 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1343 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1344 break;
1345 case AF_INET6:
1346 saddr->in6 = fl->u.ip6.saddr;
1347 daddr->in6 = fl->u.ip6.daddr;
1348 break;
1349 }
1350}
1351
1352static __inline__ int
1353__xfrm4_state_addr_check(const struct xfrm_state *x,
1354 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1355{
1356 if (daddr->a4 == x->id.daddr.a4 &&
1357 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1358 return 1;
1359 return 0;
1360}
1361
1362static __inline__ int
1363__xfrm6_state_addr_check(const struct xfrm_state *x,
1364 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1365{
1366 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1367 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1368 ipv6_addr_any((struct in6_addr *)saddr) ||
1369 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1370 return 1;
1371 return 0;
1372}
1373
1374static __inline__ int
1375xfrm_state_addr_check(const struct xfrm_state *x,
1376 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1377 unsigned short family)
1378{
1379 switch (family) {
1380 case AF_INET:
1381 return __xfrm4_state_addr_check(x, daddr, saddr);
1382 case AF_INET6:
1383 return __xfrm6_state_addr_check(x, daddr, saddr);
1384 }
1385 return 0;
1386}
1387
1388static __inline__ int
1389xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1390 unsigned short family)
1391{
1392 switch (family) {
1393 case AF_INET:
1394 return __xfrm4_state_addr_check(x,
1395 (const xfrm_address_t *)&fl->u.ip4.daddr,
1396 (const xfrm_address_t *)&fl->u.ip4.saddr);
1397 case AF_INET6:
1398 return __xfrm6_state_addr_check(x,
1399 (const xfrm_address_t *)&fl->u.ip6.daddr,
1400 (const xfrm_address_t *)&fl->u.ip6.saddr);
1401 }
1402 return 0;
1403}
1404
1405static inline int xfrm_state_kern(const struct xfrm_state *x)
1406{
1407 return atomic_read(&x->tunnel_users);
1408}
1409
1410static inline bool xfrm_id_proto_valid(u8 proto)
1411{
1412 switch (proto) {
1413 case IPPROTO_AH:
1414 case IPPROTO_ESP:
1415 case IPPROTO_COMP:
1416#if IS_ENABLED(CONFIG_IPV6)
1417 case IPPROTO_ROUTING:
1418 case IPPROTO_DSTOPTS:
1419#endif
1420 return true;
1421 default:
1422 return false;
1423 }
1424}
1425
1426/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1427static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1428{
1429 return (!userproto || proto == userproto ||
1430 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1431 proto == IPPROTO_ESP ||
1432 proto == IPPROTO_COMP)));
1433}
1434
1435/*
1436 * xfrm algorithm information
1437 */
1438struct xfrm_algo_aead_info {
1439 char *geniv;
1440 u16 icv_truncbits;
1441};
1442
1443struct xfrm_algo_auth_info {
1444 u16 icv_truncbits;
1445 u16 icv_fullbits;
1446};
1447
1448struct xfrm_algo_encr_info {
1449 char *geniv;
1450 u16 blockbits;
1451 u16 defkeybits;
1452};
1453
1454struct xfrm_algo_comp_info {
1455 u16 threshold;
1456};
1457
1458struct xfrm_algo_desc {
1459 char *name;
1460 char *compat;
1461 u8 available:1;
1462 u8 pfkey_supported:1;
1463 union {
1464 struct xfrm_algo_aead_info aead;
1465 struct xfrm_algo_auth_info auth;
1466 struct xfrm_algo_encr_info encr;
1467 struct xfrm_algo_comp_info comp;
1468 } uinfo;
1469 struct sadb_alg desc;
1470};
1471
1472/* XFRM protocol handlers. */
1473struct xfrm4_protocol {
1474 int (*handler)(struct sk_buff *skb);
1475 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1476 int encap_type);
1477 int (*cb_handler)(struct sk_buff *skb, int err);
1478 int (*err_handler)(struct sk_buff *skb, u32 info);
1479
1480 struct xfrm4_protocol __rcu *next;
1481 int priority;
1482};
1483
1484struct xfrm6_protocol {
1485 int (*handler)(struct sk_buff *skb);
1486 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1487 int encap_type);
1488 int (*cb_handler)(struct sk_buff *skb, int err);
1489 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1490 u8 type, u8 code, int offset, __be32 info);
1491
1492 struct xfrm6_protocol __rcu *next;
1493 int priority;
1494};
1495
1496/* XFRM tunnel handlers. */
1497struct xfrm_tunnel {
1498 int (*handler)(struct sk_buff *skb);
1499 int (*cb_handler)(struct sk_buff *skb, int err);
1500 int (*err_handler)(struct sk_buff *skb, u32 info);
1501
1502 struct xfrm_tunnel __rcu *next;
1503 int priority;
1504};
1505
1506struct xfrm6_tunnel {
1507 int (*handler)(struct sk_buff *skb);
1508 int (*cb_handler)(struct sk_buff *skb, int err);
1509 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1510 u8 type, u8 code, int offset, __be32 info);
1511 struct xfrm6_tunnel __rcu *next;
1512 int priority;
1513};
1514
1515void xfrm_init(void);
1516void xfrm4_init(void);
1517int xfrm_state_init(struct net *net);
1518void xfrm_state_fini(struct net *net);
1519void xfrm4_state_init(void);
1520void xfrm4_protocol_init(void);
1521#ifdef CONFIG_XFRM
1522int xfrm6_init(void);
1523void xfrm6_fini(void);
1524int xfrm6_state_init(void);
1525void xfrm6_state_fini(void);
1526int xfrm6_protocol_init(void);
1527void xfrm6_protocol_fini(void);
1528#else
1529static inline int xfrm6_init(void)
1530{
1531 return 0;
1532}
1533static inline void xfrm6_fini(void)
1534{
1535 ;
1536}
1537#endif
1538
1539#ifdef CONFIG_XFRM_STATISTICS
1540int xfrm_proc_init(struct net *net);
1541void xfrm_proc_fini(struct net *net);
1542#endif
1543
1544int xfrm_sysctl_init(struct net *net);
1545#ifdef CONFIG_SYSCTL
1546void xfrm_sysctl_fini(struct net *net);
1547#else
1548static inline void xfrm_sysctl_fini(struct net *net)
1549{
1550}
1551#endif
1552
1553void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1554 struct xfrm_address_filter *filter);
1555int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1556 int (*func)(struct xfrm_state *, int, void*), void *);
1557void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1558struct xfrm_state *xfrm_state_alloc(struct net *net);
1559void xfrm_state_free(struct xfrm_state *x);
1560struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1561 const xfrm_address_t *saddr,
1562 const struct flowi *fl,
1563 struct xfrm_tmpl *tmpl,
1564 struct xfrm_policy *pol, int *err,
1565 unsigned short family, u32 if_id);
1566struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1567 xfrm_address_t *daddr,
1568 xfrm_address_t *saddr,
1569 unsigned short family,
1570 u8 mode, u8 proto, u32 reqid);
1571struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1572 unsigned short family);
1573int xfrm_state_check_expire(struct xfrm_state *x);
1574#ifdef CONFIG_XFRM_OFFLOAD
1575static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x)
1576{
1577 struct xfrm_dev_offload *xdo = &x->xso;
1578 struct net_device *dev = xdo->dev;
1579
1580 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1581 return;
1582
1583 if (dev && dev->xfrmdev_ops &&
1584 dev->xfrmdev_ops->xdo_dev_state_update_curlft)
1585 dev->xfrmdev_ops->xdo_dev_state_update_curlft(x);
1586
1587}
1588#else
1589static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {}
1590#endif
1591void xfrm_state_insert(struct xfrm_state *x);
1592int xfrm_state_add(struct xfrm_state *x);
1593int xfrm_state_update(struct xfrm_state *x);
1594struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1595 const xfrm_address_t *daddr, __be32 spi,
1596 u8 proto, unsigned short family);
1597struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1598 const xfrm_address_t *daddr,
1599 const xfrm_address_t *saddr,
1600 u8 proto,
1601 unsigned short family);
1602#ifdef CONFIG_XFRM_SUB_POLICY
1603void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1604 unsigned short family);
1605void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1606 unsigned short family);
1607#else
1608static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1609 int n, unsigned short family)
1610{
1611}
1612
1613static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1614 int n, unsigned short family)
1615{
1616}
1617#endif
1618
1619struct xfrmk_sadinfo {
1620 u32 sadhcnt; /* current hash bkts */
1621 u32 sadhmcnt; /* max allowed hash bkts */
1622 u32 sadcnt; /* current running count */
1623};
1624
1625struct xfrmk_spdinfo {
1626 u32 incnt;
1627 u32 outcnt;
1628 u32 fwdcnt;
1629 u32 inscnt;
1630 u32 outscnt;
1631 u32 fwdscnt;
1632 u32 spdhcnt;
1633 u32 spdhmcnt;
1634};
1635
1636struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1637int xfrm_state_delete(struct xfrm_state *x);
1638int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1639int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1640int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1641 bool task_valid);
1642void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1643void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1644u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1645int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1646u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1647int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1648 struct netlink_ext_ack *extack);
1649int xfrm_init_state(struct xfrm_state *x);
1650int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1651int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1652int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1653 int (*finish)(struct net *, struct sock *,
1654 struct sk_buff *));
1655int xfrm_trans_queue(struct sk_buff *skb,
1656 int (*finish)(struct net *, struct sock *,
1657 struct sk_buff *));
1658int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1659int xfrm_output(struct sock *sk, struct sk_buff *skb);
1660
1661#if IS_ENABLED(CONFIG_NET_PKTGEN)
1662int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1663#endif
1664
1665void xfrm_local_error(struct sk_buff *skb, int mtu);
1666int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1667int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1668 int encap_type);
1669int xfrm4_transport_finish(struct sk_buff *skb, int async);
1670int xfrm4_rcv(struct sk_buff *skb);
1671
1672static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1673{
1674 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1675 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1676 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1677 return xfrm_input(skb, nexthdr, spi, 0);
1678}
1679
1680int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1681int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1682int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1683int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1684int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1685void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1686int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1687int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1688 struct ip6_tnl *t);
1689int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1690 int encap_type);
1691int xfrm6_transport_finish(struct sk_buff *skb, int async);
1692int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1693int xfrm6_rcv(struct sk_buff *skb);
1694int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1695 xfrm_address_t *saddr, u8 proto);
1696void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1697int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1698int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1699int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1700int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1701__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1702__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1703int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1704
1705#ifdef CONFIG_XFRM
1706void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1707int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1708int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1709int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1710 int optlen);
1711#else
1712static inline int xfrm_user_policy(struct sock *sk, int optname,
1713 sockptr_t optval, int optlen)
1714{
1715 return -ENOPROTOOPT;
1716}
1717#endif
1718
1719struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1720 const xfrm_address_t *saddr,
1721 const xfrm_address_t *daddr,
1722 int family, u32 mark);
1723
1724struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1725
1726void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1727int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1728 int (*func)(struct xfrm_policy *, int, int, void*),
1729 void *);
1730void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1731int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1732struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1733 const struct xfrm_mark *mark,
1734 u32 if_id, u8 type, int dir,
1735 struct xfrm_selector *sel,
1736 struct xfrm_sec_ctx *ctx, int delete,
1737 int *err);
1738struct xfrm_policy *xfrm_policy_byid(struct net *net,
1739 const struct xfrm_mark *mark, u32 if_id,
1740 u8 type, int dir, u32 id, int delete,
1741 int *err);
1742int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1743void xfrm_policy_hash_rebuild(struct net *net);
1744u32 xfrm_get_acqseq(void);
1745int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1746int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1747 struct netlink_ext_ack *extack);
1748struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1749 u8 mode, u32 reqid, u32 if_id, u8 proto,
1750 const xfrm_address_t *daddr,
1751 const xfrm_address_t *saddr, int create,
1752 unsigned short family);
1753int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1754
1755#ifdef CONFIG_XFRM_MIGRATE
1756int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1757 const struct xfrm_migrate *m, int num_bundles,
1758 const struct xfrm_kmaddress *k,
1759 const struct xfrm_encap_tmpl *encap);
1760struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1761 u32 if_id);
1762struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1763 struct xfrm_migrate *m,
1764 struct xfrm_encap_tmpl *encap);
1765int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1766 struct xfrm_migrate *m, int num_bundles,
1767 struct xfrm_kmaddress *k, struct net *net,
1768 struct xfrm_encap_tmpl *encap, u32 if_id,
1769 struct netlink_ext_ack *extack);
1770#endif
1771
1772int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1773void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1774int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1775 xfrm_address_t *addr);
1776
1777void xfrm_input_init(void);
1778int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1779
1780void xfrm_probe_algs(void);
1781int xfrm_count_pfkey_auth_supported(void);
1782int xfrm_count_pfkey_enc_supported(void);
1783struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1784struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1785struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1786struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1787struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1788struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1789struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1790struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1791struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1792 int probe);
1793
1794static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1795 const xfrm_address_t *b)
1796{
1797 return ipv6_addr_equal((const struct in6_addr *)a,
1798 (const struct in6_addr *)b);
1799}
1800
1801static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1802 const xfrm_address_t *b,
1803 sa_family_t family)
1804{
1805 switch (family) {
1806 default:
1807 case AF_INET:
1808 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1809 case AF_INET6:
1810 return xfrm6_addr_equal(a, b);
1811 }
1812}
1813
1814static inline int xfrm_policy_id2dir(u32 index)
1815{
1816 return index & 7;
1817}
1818
1819#ifdef CONFIG_XFRM
1820void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1821int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1822void xfrm_replay_notify(struct xfrm_state *x, int event);
1823int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1824int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1825
1826static inline int xfrm_aevent_is_on(struct net *net)
1827{
1828 struct sock *nlsk;
1829 int ret = 0;
1830
1831 rcu_read_lock();
1832 nlsk = rcu_dereference(net->xfrm.nlsk);
1833 if (nlsk)
1834 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1835 rcu_read_unlock();
1836 return ret;
1837}
1838
1839static inline int xfrm_acquire_is_on(struct net *net)
1840{
1841 struct sock *nlsk;
1842 int ret = 0;
1843
1844 rcu_read_lock();
1845 nlsk = rcu_dereference(net->xfrm.nlsk);
1846 if (nlsk)
1847 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1848 rcu_read_unlock();
1849
1850 return ret;
1851}
1852#endif
1853
1854static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1855{
1856 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1857}
1858
1859static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1860{
1861 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1862}
1863
1864static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1865{
1866 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1867}
1868
1869static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1870{
1871 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1872}
1873
1874#ifdef CONFIG_XFRM_MIGRATE
1875static inline int xfrm_replay_clone(struct xfrm_state *x,
1876 struct xfrm_state *orig)
1877{
1878
1879 x->replay_esn = kmemdup(orig->replay_esn,
1880 xfrm_replay_state_esn_len(orig->replay_esn),
1881 GFP_KERNEL);
1882 if (!x->replay_esn)
1883 return -ENOMEM;
1884 x->preplay_esn = kmemdup(orig->preplay_esn,
1885 xfrm_replay_state_esn_len(orig->preplay_esn),
1886 GFP_KERNEL);
1887 if (!x->preplay_esn)
1888 return -ENOMEM;
1889
1890 return 0;
1891}
1892
1893static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1894{
1895 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1896}
1897
1898
1899static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1900{
1901 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1902}
1903
1904static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1905{
1906 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1907}
1908
1909static inline void xfrm_states_put(struct xfrm_state **states, int n)
1910{
1911 int i;
1912 for (i = 0; i < n; i++)
1913 xfrm_state_put(*(states + i));
1914}
1915
1916static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1917{
1918 int i;
1919 for (i = 0; i < n; i++)
1920 xfrm_state_delete(*(states + i));
1921}
1922#endif
1923
1924void __init xfrm_dev_init(void);
1925
1926#ifdef CONFIG_XFRM_OFFLOAD
1927void xfrm_dev_resume(struct sk_buff *skb);
1928void xfrm_dev_backlog(struct softnet_data *sd);
1929struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1930int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1931 struct xfrm_user_offload *xuo,
1932 struct netlink_ext_ack *extack);
1933int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1934 struct xfrm_user_offload *xuo, u8 dir,
1935 struct netlink_ext_ack *extack);
1936bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1937
1938static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1939{
1940 struct xfrm_dev_offload *xso = &x->xso;
1941
1942 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1943 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1944}
1945
1946static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1947{
1948 struct xfrm_state *x = dst->xfrm;
1949 struct xfrm_dst *xdst;
1950
1951 if (!x || !x->type_offload)
1952 return false;
1953
1954 xdst = (struct xfrm_dst *) dst;
1955 if (!x->xso.offload_handle && !xdst->child->xfrm)
1956 return true;
1957 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1958 !xdst->child->xfrm)
1959 return true;
1960
1961 return false;
1962}
1963
1964static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1965{
1966 struct xfrm_dev_offload *xso = &x->xso;
1967
1968 if (xso->dev)
1969 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1970}
1971
1972static inline void xfrm_dev_state_free(struct xfrm_state *x)
1973{
1974 struct xfrm_dev_offload *xso = &x->xso;
1975 struct net_device *dev = xso->dev;
1976
1977 if (dev && dev->xfrmdev_ops) {
1978 if (dev->xfrmdev_ops->xdo_dev_state_free)
1979 dev->xfrmdev_ops->xdo_dev_state_free(x);
1980 xso->dev = NULL;
1981 netdev_put(dev, &xso->dev_tracker);
1982 }
1983}
1984
1985static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1986{
1987 struct xfrm_dev_offload *xdo = &x->xdo;
1988 struct net_device *dev = xdo->dev;
1989
1990 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
1991 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
1992}
1993
1994static inline void xfrm_dev_policy_free(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) {
2000 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2001 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2002 xdo->dev = NULL;
2003 netdev_put(dev, &xdo->dev_tracker);
2004 }
2005}
2006#else
2007static inline void xfrm_dev_resume(struct sk_buff *skb)
2008{
2009}
2010
2011static inline void xfrm_dev_backlog(struct softnet_data *sd)
2012{
2013}
2014
2015static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2016{
2017 return skb;
2018}
2019
2020static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2021{
2022 return 0;
2023}
2024
2025static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2026{
2027}
2028
2029static inline void xfrm_dev_state_free(struct xfrm_state *x)
2030{
2031}
2032
2033static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2034 struct xfrm_user_offload *xuo, u8 dir,
2035 struct netlink_ext_ack *extack)
2036{
2037 return 0;
2038}
2039
2040static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2041{
2042}
2043
2044static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2045{
2046}
2047
2048static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2049{
2050 return false;
2051}
2052
2053static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2054{
2055}
2056
2057static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2058{
2059 return false;
2060}
2061#endif
2062
2063static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2064{
2065 if (attrs[XFRMA_MARK])
2066 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2067 else
2068 m->v = m->m = 0;
2069
2070 return m->v & m->m;
2071}
2072
2073static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2074{
2075 int ret = 0;
2076
2077 if (m->m | m->v)
2078 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2079 return ret;
2080}
2081
2082static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2083{
2084 struct xfrm_mark *m = &x->props.smark;
2085
2086 return (m->v & m->m) | (mark & ~m->m);
2087}
2088
2089static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2090{
2091 int ret = 0;
2092
2093 if (if_id)
2094 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2095 return ret;
2096}
2097
2098static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2099 unsigned int family)
2100{
2101 bool tunnel = false;
2102
2103 switch(family) {
2104 case AF_INET:
2105 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2106 tunnel = true;
2107 break;
2108 case AF_INET6:
2109 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2110 tunnel = true;
2111 break;
2112 }
2113 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2114 return -EINVAL;
2115
2116 return 0;
2117}
2118
2119extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2120extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2121
2122struct xfrm_translator {
2123 /* Allocate frag_list and put compat translation there */
2124 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2125
2126 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2127 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2128 int maxtype, const struct nla_policy *policy,
2129 struct netlink_ext_ack *extack);
2130
2131 /* Translate 32-bit user_policy from sockptr */
2132 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2133
2134 struct module *owner;
2135};
2136
2137#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2138extern int xfrm_register_translator(struct xfrm_translator *xtr);
2139extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2140extern struct xfrm_translator *xfrm_get_translator(void);
2141extern void xfrm_put_translator(struct xfrm_translator *xtr);
2142#else
2143static inline struct xfrm_translator *xfrm_get_translator(void)
2144{
2145 return NULL;
2146}
2147static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2148{
2149}
2150#endif
2151
2152#if IS_ENABLED(CONFIG_IPV6)
2153static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2154{
2155 int proto;
2156
2157 if (!sk || sk->sk_family != AF_INET6)
2158 return false;
2159
2160 proto = sk->sk_protocol;
2161 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2162 return inet6_sk(sk)->dontfrag;
2163
2164 return false;
2165}
2166#endif
2167
2168#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2169 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2170
2171extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2172
2173int register_xfrm_interface_bpf(void);
2174
2175#else
2176
2177static inline int register_xfrm_interface_bpf(void)
2178{
2179 return 0;
2180}
2181
2182#endif
2183
2184#endif /* _NET_XFRM_H */