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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#define XFRM_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.xfrm_statistics, field, val)
55#else
56#define XFRM_INC_STATS(net, field) ((void)(net))
57#define XFRM_ADD_STATS(net, field, val) ((void)(net))
58#endif
59
60
61/* Organization of SPD aka "XFRM rules"
62 ------------------------------------
63
64 Basic objects:
65 - policy rule, struct xfrm_policy (=SPD entry)
66 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
67 - instance of a transformer, struct xfrm_state (=SA)
68 - template to clone xfrm_state, struct xfrm_tmpl
69
70 SPD is plain linear list of xfrm_policy rules, ordered by priority.
71 (To be compatible with existing pfkeyv2 implementations,
72 many rules with priority of 0x7fffffff are allowed to exist and
73 such rules are ordered in an unpredictable way, thanks to bsd folks.)
74
75 Lookup is plain linear search until the first match with selector.
76
77 If "action" is "block", then we prohibit the flow, otherwise:
78 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
79 policy entry has list of up to XFRM_MAX_DEPTH transformations,
80 described by templates xfrm_tmpl. Each template is resolved
81 to a complete xfrm_state (see below) and we pack bundle of transformations
82 to a dst_entry returned to requestor.
83
84 dst -. xfrm .-> xfrm_state #1
85 |---. child .-> dst -. xfrm .-> xfrm_state #2
86 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 |---. child .-> NULL
88
89 Bundles are cached at xrfm_policy struct (field ->bundles).
90
91
92 Resolution of xrfm_tmpl
93 -----------------------
94 Template contains:
95 1. ->mode Mode: transport or tunnel
96 2. ->id.proto Protocol: AH/ESP/IPCOMP
97 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
98 Q: allow to resolve security gateway?
99 4. ->id.spi If not zero, static SPI.
100 5. ->saddr Local tunnel endpoint, ignored for transport mode.
101 6. ->algos List of allowed algos. Plain bitmask now.
102 Q: ealgos, aalgos, calgos. What a mess...
103 7. ->share Sharing mode.
104 Q: how to implement private sharing mode? To add struct sock* to
105 flow id?
106
107 Having this template we search through SAD searching for entries
108 with appropriate mode/proto/algo, permitted by selector.
109 If no appropriate entry found, it is requested from key manager.
110
111 PROBLEMS:
112 Q: How to find all the bundles referring to a physical path for
113 PMTU discovery? Seems, dst should contain list of all parents...
114 and enter to infinite locking hierarchy disaster.
115 No! It is easier, we will not search for them, let them find us.
116 We add genid to each dst plus pointer to genid of raw IP route,
117 pmtu disc will update pmtu on raw IP route and increase its genid.
118 dst_check() will see this for top level and trigger resyncing
119 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 */
121
122struct xfrm_state_walk {
123 struct list_head all;
124 u8 state;
125 u8 dying;
126 u8 proto;
127 u32 seq;
128 struct xfrm_address_filter *filter;
129};
130
131enum {
132 XFRM_DEV_OFFLOAD_IN = 1,
133 XFRM_DEV_OFFLOAD_OUT,
134 XFRM_DEV_OFFLOAD_FWD,
135};
136
137enum {
138 XFRM_DEV_OFFLOAD_UNSPECIFIED,
139 XFRM_DEV_OFFLOAD_CRYPTO,
140 XFRM_DEV_OFFLOAD_PACKET,
141};
142
143enum {
144 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
145};
146
147struct xfrm_dev_offload {
148 struct net_device *dev;
149 netdevice_tracker dev_tracker;
150 struct net_device *real_dev;
151 unsigned long offload_handle;
152 u8 dir : 2;
153 u8 type : 2;
154 u8 flags : 2;
155};
156
157struct xfrm_mode {
158 u8 encap;
159 u8 family;
160 u8 flags;
161};
162
163/* Flags for xfrm_mode. */
164enum {
165 XFRM_MODE_FLAG_TUNNEL = 1,
166};
167
168enum xfrm_replay_mode {
169 XFRM_REPLAY_MODE_LEGACY,
170 XFRM_REPLAY_MODE_BMP,
171 XFRM_REPLAY_MODE_ESN,
172};
173
174/* Full description of state of transformer. */
175struct xfrm_state {
176 possible_net_t xs_net;
177 union {
178 struct hlist_node gclist;
179 struct hlist_node bydst;
180 };
181 struct hlist_node bysrc;
182 struct hlist_node byspi;
183 struct hlist_node byseq;
184
185 refcount_t refcnt;
186 spinlock_t lock;
187
188 struct xfrm_id id;
189 struct xfrm_selector sel;
190 struct xfrm_mark mark;
191 u32 if_id;
192 u32 tfcpad;
193
194 u32 genid;
195
196 /* Key manager bits */
197 struct xfrm_state_walk km;
198
199 /* Parameters of this state. */
200 struct {
201 u32 reqid;
202 u8 mode;
203 u8 replay_window;
204 u8 aalgo, ealgo, calgo;
205 u8 flags;
206 u16 family;
207 xfrm_address_t saddr;
208 int header_len;
209 int trailer_len;
210 u32 extra_flags;
211 struct xfrm_mark smark;
212 } props;
213
214 struct xfrm_lifetime_cfg lft;
215
216 /* Data for transformer */
217 struct xfrm_algo_auth *aalg;
218 struct xfrm_algo *ealg;
219 struct xfrm_algo *calg;
220 struct xfrm_algo_aead *aead;
221 const char *geniv;
222
223 /* mapping change rate limiting */
224 __be16 new_mapping_sport;
225 u32 new_mapping; /* seconds */
226 u32 mapping_maxage; /* seconds for input SA */
227
228 /* Data for encapsulator */
229 struct xfrm_encap_tmpl *encap;
230 struct sock __rcu *encap_sk;
231
232 /* Data for care-of address */
233 xfrm_address_t *coaddr;
234
235 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
236 struct xfrm_state *tunnel;
237
238 /* If a tunnel, number of users + 1 */
239 atomic_t tunnel_users;
240
241 /* State for replay detection */
242 struct xfrm_replay_state replay;
243 struct xfrm_replay_state_esn *replay_esn;
244
245 /* Replay detection state at the time we sent the last notification */
246 struct xfrm_replay_state preplay;
247 struct xfrm_replay_state_esn *preplay_esn;
248
249 /* replay detection mode */
250 enum xfrm_replay_mode repl_mode;
251 /* internal flag that only holds state for delayed aevent at the
252 * moment
253 */
254 u32 xflags;
255
256 /* Replay detection notification settings */
257 u32 replay_maxage;
258 u32 replay_maxdiff;
259
260 /* Replay detection notification timer */
261 struct timer_list rtimer;
262
263 /* Statistics */
264 struct xfrm_stats stats;
265
266 struct xfrm_lifetime_cur curlft;
267 struct hrtimer mtimer;
268
269 struct xfrm_dev_offload xso;
270
271 /* used to fix curlft->add_time when changing date */
272 long saved_tmo;
273
274 /* Last used time */
275 time64_t lastused;
276
277 struct page_frag xfrag;
278
279 /* Reference to data common to all the instances of this
280 * transformer. */
281 const struct xfrm_type *type;
282 struct xfrm_mode inner_mode;
283 struct xfrm_mode inner_mode_iaf;
284 struct xfrm_mode outer_mode;
285
286 const struct xfrm_type_offload *type_offload;
287
288 /* Security context */
289 struct xfrm_sec_ctx *security;
290
291 /* Private data of this transformer, format is opaque,
292 * interpreted by xfrm_type methods. */
293 void *data;
294};
295
296static inline struct net *xs_net(struct xfrm_state *x)
297{
298 return read_pnet(&x->xs_net);
299}
300
301/* xflags - make enum if more show up */
302#define XFRM_TIME_DEFER 1
303#define XFRM_SOFT_EXPIRE 2
304
305enum {
306 XFRM_STATE_VOID,
307 XFRM_STATE_ACQ,
308 XFRM_STATE_VALID,
309 XFRM_STATE_ERROR,
310 XFRM_STATE_EXPIRED,
311 XFRM_STATE_DEAD
312};
313
314/* callback structure passed from either netlink or pfkey */
315struct km_event {
316 union {
317 u32 hard;
318 u32 proto;
319 u32 byid;
320 u32 aevent;
321 u32 type;
322 } data;
323
324 u32 seq;
325 u32 portid;
326 u32 event;
327 struct net *net;
328};
329
330struct xfrm_if_decode_session_result {
331 struct net *net;
332 u32 if_id;
333};
334
335struct xfrm_if_cb {
336 bool (*decode_session)(struct sk_buff *skb,
337 unsigned short family,
338 struct xfrm_if_decode_session_result *res);
339};
340
341void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
342void xfrm_if_unregister_cb(void);
343
344struct net_device;
345struct xfrm_type;
346struct xfrm_dst;
347struct xfrm_policy_afinfo {
348 struct dst_ops *dst_ops;
349 struct dst_entry *(*dst_lookup)(struct net *net,
350 int tos, int oif,
351 const xfrm_address_t *saddr,
352 const xfrm_address_t *daddr,
353 u32 mark);
354 int (*get_saddr)(struct net *net, int oif,
355 xfrm_address_t *saddr,
356 xfrm_address_t *daddr,
357 u32 mark);
358 int (*fill_dst)(struct xfrm_dst *xdst,
359 struct net_device *dev,
360 const struct flowi *fl);
361 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
362};
363
364int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
365void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
366void km_policy_notify(struct xfrm_policy *xp, int dir,
367 const struct km_event *c);
368void km_state_notify(struct xfrm_state *x, const struct km_event *c);
369
370struct xfrm_tmpl;
371int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
372 struct xfrm_policy *pol);
373void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
374int __xfrm_state_delete(struct xfrm_state *x);
375
376struct xfrm_state_afinfo {
377 u8 family;
378 u8 proto;
379
380 const struct xfrm_type_offload *type_offload_esp;
381
382 const struct xfrm_type *type_esp;
383 const struct xfrm_type *type_ipip;
384 const struct xfrm_type *type_ipip6;
385 const struct xfrm_type *type_comp;
386 const struct xfrm_type *type_ah;
387 const struct xfrm_type *type_routing;
388 const struct xfrm_type *type_dstopts;
389
390 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
391 int (*transport_finish)(struct sk_buff *skb,
392 int async);
393 void (*local_error)(struct sk_buff *skb, u32 mtu);
394};
395
396int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
397int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
398struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
399struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
400
401struct xfrm_input_afinfo {
402 u8 family;
403 bool is_ipip;
404 int (*callback)(struct sk_buff *skb, u8 protocol,
405 int err);
406};
407
408int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
409int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
410
411void xfrm_flush_gc(void);
412void xfrm_state_delete_tunnel(struct xfrm_state *x);
413
414struct xfrm_type {
415 struct module *owner;
416 u8 proto;
417 u8 flags;
418#define XFRM_TYPE_NON_FRAGMENT 1
419#define XFRM_TYPE_REPLAY_PROT 2
420#define XFRM_TYPE_LOCAL_COADDR 4
421#define XFRM_TYPE_REMOTE_COADDR 8
422
423 int (*init_state)(struct xfrm_state *x,
424 struct netlink_ext_ack *extack);
425 void (*destructor)(struct xfrm_state *);
426 int (*input)(struct xfrm_state *, struct sk_buff *skb);
427 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
428 int (*reject)(struct xfrm_state *, struct sk_buff *,
429 const struct flowi *);
430};
431
432int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
433void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
434
435struct xfrm_type_offload {
436 struct module *owner;
437 u8 proto;
438 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
439 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
440 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
441};
442
443int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
444void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
445
446static inline int xfrm_af2proto(unsigned int family)
447{
448 switch(family) {
449 case AF_INET:
450 return IPPROTO_IPIP;
451 case AF_INET6:
452 return IPPROTO_IPV6;
453 default:
454 return 0;
455 }
456}
457
458static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
459{
460 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
461 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
462 return &x->inner_mode;
463 else
464 return &x->inner_mode_iaf;
465}
466
467struct xfrm_tmpl {
468/* id in template is interpreted as:
469 * daddr - destination of tunnel, may be zero for transport mode.
470 * spi - zero to acquire spi. Not zero if spi is static, then
471 * daddr must be fixed too.
472 * proto - AH/ESP/IPCOMP
473 */
474 struct xfrm_id id;
475
476/* Source address of tunnel. Ignored, if it is not a tunnel. */
477 xfrm_address_t saddr;
478
479 unsigned short encap_family;
480
481 u32 reqid;
482
483/* Mode: transport, tunnel etc. */
484 u8 mode;
485
486/* Sharing mode: unique, this session only, this user only etc. */
487 u8 share;
488
489/* May skip this transfomration if no SA is found */
490 u8 optional;
491
492/* Skip aalgos/ealgos/calgos checks. */
493 u8 allalgs;
494
495/* Bit mask of algos allowed for acquisition */
496 u32 aalgos;
497 u32 ealgos;
498 u32 calgos;
499};
500
501#define XFRM_MAX_DEPTH 6
502#define XFRM_MAX_OFFLOAD_DEPTH 1
503
504struct xfrm_policy_walk_entry {
505 struct list_head all;
506 u8 dead;
507};
508
509struct xfrm_policy_walk {
510 struct xfrm_policy_walk_entry walk;
511 u8 type;
512 u32 seq;
513};
514
515struct xfrm_policy_queue {
516 struct sk_buff_head hold_queue;
517 struct timer_list hold_timer;
518 unsigned long timeout;
519};
520
521struct xfrm_policy {
522 possible_net_t xp_net;
523 struct hlist_node bydst;
524 struct hlist_node byidx;
525
526 /* This lock only affects elements except for entry. */
527 rwlock_t lock;
528 refcount_t refcnt;
529 u32 pos;
530 struct timer_list timer;
531
532 atomic_t genid;
533 u32 priority;
534 u32 index;
535 u32 if_id;
536 struct xfrm_mark mark;
537 struct xfrm_selector selector;
538 struct xfrm_lifetime_cfg lft;
539 struct xfrm_lifetime_cur curlft;
540 struct xfrm_policy_walk_entry walk;
541 struct xfrm_policy_queue polq;
542 bool bydst_reinsert;
543 u8 type;
544 u8 action;
545 u8 flags;
546 u8 xfrm_nr;
547 u16 family;
548 struct xfrm_sec_ctx *security;
549 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
550 struct hlist_node bydst_inexact_list;
551 struct rcu_head rcu;
552
553 struct xfrm_dev_offload xdo;
554};
555
556static inline struct net *xp_net(const struct xfrm_policy *xp)
557{
558 return read_pnet(&xp->xp_net);
559}
560
561struct xfrm_kmaddress {
562 xfrm_address_t local;
563 xfrm_address_t remote;
564 u32 reserved;
565 u16 family;
566};
567
568struct xfrm_migrate {
569 xfrm_address_t old_daddr;
570 xfrm_address_t old_saddr;
571 xfrm_address_t new_daddr;
572 xfrm_address_t new_saddr;
573 u8 proto;
574 u8 mode;
575 u16 reserved;
576 u32 reqid;
577 u16 old_family;
578 u16 new_family;
579};
580
581#define XFRM_KM_TIMEOUT 30
582/* what happened */
583#define XFRM_REPLAY_UPDATE XFRM_AE_CR
584#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
585
586/* default aevent timeout in units of 100ms */
587#define XFRM_AE_ETIME 10
588/* Async Event timer multiplier */
589#define XFRM_AE_ETH_M 10
590/* default seq threshold size */
591#define XFRM_AE_SEQT_SIZE 2
592
593struct xfrm_mgr {
594 struct list_head list;
595 int (*notify)(struct xfrm_state *x, const struct km_event *c);
596 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
597 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
598 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
599 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
600 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
601 int (*migrate)(const struct xfrm_selector *sel,
602 u8 dir, u8 type,
603 const struct xfrm_migrate *m,
604 int num_bundles,
605 const struct xfrm_kmaddress *k,
606 const struct xfrm_encap_tmpl *encap);
607 bool (*is_alive)(const struct km_event *c);
608};
609
610void xfrm_register_km(struct xfrm_mgr *km);
611void xfrm_unregister_km(struct xfrm_mgr *km);
612
613struct xfrm_tunnel_skb_cb {
614 union {
615 struct inet_skb_parm h4;
616 struct inet6_skb_parm h6;
617 } header;
618
619 union {
620 struct ip_tunnel *ip4;
621 struct ip6_tnl *ip6;
622 } tunnel;
623};
624
625#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
626
627/*
628 * This structure is used for the duration where packets are being
629 * transformed by IPsec. As soon as the packet leaves IPsec the
630 * area beyond the generic IP part may be overwritten.
631 */
632struct xfrm_skb_cb {
633 struct xfrm_tunnel_skb_cb header;
634
635 /* Sequence number for replay protection. */
636 union {
637 struct {
638 __u32 low;
639 __u32 hi;
640 } output;
641 struct {
642 __be32 low;
643 __be32 hi;
644 } input;
645 } seq;
646};
647
648#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
649
650/*
651 * This structure is used by the afinfo prepare_input/prepare_output functions
652 * to transmit header information to the mode input/output functions.
653 */
654struct xfrm_mode_skb_cb {
655 struct xfrm_tunnel_skb_cb header;
656
657 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
658 __be16 id;
659 __be16 frag_off;
660
661 /* IP header length (excluding options or extension headers). */
662 u8 ihl;
663
664 /* TOS for IPv4, class for IPv6. */
665 u8 tos;
666
667 /* TTL for IPv4, hop limitfor IPv6. */
668 u8 ttl;
669
670 /* Protocol for IPv4, NH for IPv6. */
671 u8 protocol;
672
673 /* Option length for IPv4, zero for IPv6. */
674 u8 optlen;
675
676 /* Used by IPv6 only, zero for IPv4. */
677 u8 flow_lbl[3];
678};
679
680#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
681
682/*
683 * This structure is used by the input processing to locate the SPI and
684 * related information.
685 */
686struct xfrm_spi_skb_cb {
687 struct xfrm_tunnel_skb_cb header;
688
689 unsigned int daddroff;
690 unsigned int family;
691 __be32 seq;
692};
693
694#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
695
696#ifdef CONFIG_AUDITSYSCALL
697static inline struct audit_buffer *xfrm_audit_start(const char *op)
698{
699 struct audit_buffer *audit_buf = NULL;
700
701 if (audit_enabled == AUDIT_OFF)
702 return NULL;
703 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
704 AUDIT_MAC_IPSEC_EVENT);
705 if (audit_buf == NULL)
706 return NULL;
707 audit_log_format(audit_buf, "op=%s", op);
708 return audit_buf;
709}
710
711static inline void xfrm_audit_helper_usrinfo(bool task_valid,
712 struct audit_buffer *audit_buf)
713{
714 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
715 audit_get_loginuid(current) :
716 INVALID_UID);
717 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
718 AUDIT_SID_UNSET;
719
720 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
721 audit_log_task_context(audit_buf);
722}
723
724void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
725void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
726 bool task_valid);
727void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
728void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
729void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
730 struct sk_buff *skb);
731void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
732 __be32 net_seq);
733void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
734void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
735 __be32 net_seq);
736void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
737 u8 proto);
738#else
739
740static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
741 bool task_valid)
742{
743}
744
745static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
746 bool task_valid)
747{
748}
749
750static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
751 bool task_valid)
752{
753}
754
755static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
756 bool task_valid)
757{
758}
759
760static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
761 struct sk_buff *skb)
762{
763}
764
765static inline void xfrm_audit_state_replay(struct xfrm_state *x,
766 struct sk_buff *skb, __be32 net_seq)
767{
768}
769
770static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
771 u16 family)
772{
773}
774
775static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
776 __be32 net_spi, __be32 net_seq)
777{
778}
779
780static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
781 struct sk_buff *skb, u8 proto)
782{
783}
784#endif /* CONFIG_AUDITSYSCALL */
785
786static inline void xfrm_pol_hold(struct xfrm_policy *policy)
787{
788 if (likely(policy != NULL))
789 refcount_inc(&policy->refcnt);
790}
791
792void xfrm_policy_destroy(struct xfrm_policy *policy);
793
794static inline void xfrm_pol_put(struct xfrm_policy *policy)
795{
796 if (refcount_dec_and_test(&policy->refcnt))
797 xfrm_policy_destroy(policy);
798}
799
800static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
801{
802 int i;
803 for (i = npols - 1; i >= 0; --i)
804 xfrm_pol_put(pols[i]);
805}
806
807void __xfrm_state_destroy(struct xfrm_state *, bool);
808
809static inline void __xfrm_state_put(struct xfrm_state *x)
810{
811 refcount_dec(&x->refcnt);
812}
813
814static inline void xfrm_state_put(struct xfrm_state *x)
815{
816 if (refcount_dec_and_test(&x->refcnt))
817 __xfrm_state_destroy(x, false);
818}
819
820static inline void xfrm_state_put_sync(struct xfrm_state *x)
821{
822 if (refcount_dec_and_test(&x->refcnt))
823 __xfrm_state_destroy(x, true);
824}
825
826static inline void xfrm_state_hold(struct xfrm_state *x)
827{
828 refcount_inc(&x->refcnt);
829}
830
831static inline bool addr_match(const void *token1, const void *token2,
832 unsigned int prefixlen)
833{
834 const __be32 *a1 = token1;
835 const __be32 *a2 = token2;
836 unsigned int pdw;
837 unsigned int pbi;
838
839 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
840 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
841
842 if (pdw)
843 if (memcmp(a1, a2, pdw << 2))
844 return false;
845
846 if (pbi) {
847 __be32 mask;
848
849 mask = htonl((0xffffffff) << (32 - pbi));
850
851 if ((a1[pdw] ^ a2[pdw]) & mask)
852 return false;
853 }
854
855 return true;
856}
857
858static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
859{
860 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
861 if (sizeof(long) == 4 && prefixlen == 0)
862 return true;
863 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
864}
865
866static __inline__
867__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
868{
869 __be16 port;
870 switch(fl->flowi_proto) {
871 case IPPROTO_TCP:
872 case IPPROTO_UDP:
873 case IPPROTO_UDPLITE:
874 case IPPROTO_SCTP:
875 port = uli->ports.sport;
876 break;
877 case IPPROTO_ICMP:
878 case IPPROTO_ICMPV6:
879 port = htons(uli->icmpt.type);
880 break;
881 case IPPROTO_MH:
882 port = htons(uli->mht.type);
883 break;
884 case IPPROTO_GRE:
885 port = htons(ntohl(uli->gre_key) >> 16);
886 break;
887 default:
888 port = 0; /*XXX*/
889 }
890 return port;
891}
892
893static __inline__
894__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
895{
896 __be16 port;
897 switch(fl->flowi_proto) {
898 case IPPROTO_TCP:
899 case IPPROTO_UDP:
900 case IPPROTO_UDPLITE:
901 case IPPROTO_SCTP:
902 port = uli->ports.dport;
903 break;
904 case IPPROTO_ICMP:
905 case IPPROTO_ICMPV6:
906 port = htons(uli->icmpt.code);
907 break;
908 case IPPROTO_GRE:
909 port = htons(ntohl(uli->gre_key) & 0xffff);
910 break;
911 default:
912 port = 0; /*XXX*/
913 }
914 return port;
915}
916
917bool xfrm_selector_match(const struct xfrm_selector *sel,
918 const struct flowi *fl, unsigned short family);
919
920#ifdef CONFIG_SECURITY_NETWORK_XFRM
921/* If neither has a context --> match
922 * Otherwise, both must have a context and the sids, doi, alg must match
923 */
924static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
925{
926 return ((!s1 && !s2) ||
927 (s1 && s2 &&
928 (s1->ctx_sid == s2->ctx_sid) &&
929 (s1->ctx_doi == s2->ctx_doi) &&
930 (s1->ctx_alg == s2->ctx_alg)));
931}
932#else
933static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
934{
935 return true;
936}
937#endif
938
939/* A struct encoding bundle of transformations to apply to some set of flow.
940 *
941 * xdst->child points to the next element of bundle.
942 * dst->xfrm points to an instanse of transformer.
943 *
944 * Due to unfortunate limitations of current routing cache, which we
945 * have no time to fix, it mirrors struct rtable and bound to the same
946 * routing key, including saddr,daddr. However, we can have many of
947 * bundles differing by session id. All the bundles grow from a parent
948 * policy rule.
949 */
950struct xfrm_dst {
951 union {
952 struct dst_entry dst;
953 struct rtable rt;
954 struct rt6_info rt6;
955 } u;
956 struct dst_entry *route;
957 struct dst_entry *child;
958 struct dst_entry *path;
959 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
960 int num_pols, num_xfrms;
961 u32 xfrm_genid;
962 u32 policy_genid;
963 u32 route_mtu_cached;
964 u32 child_mtu_cached;
965 u32 route_cookie;
966 u32 path_cookie;
967};
968
969static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
970{
971#ifdef CONFIG_XFRM
972 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
973 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
974
975 return xdst->path;
976 }
977#endif
978 return (struct dst_entry *) dst;
979}
980
981static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
982{
983#ifdef CONFIG_XFRM
984 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
985 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
986 return xdst->child;
987 }
988#endif
989 return NULL;
990}
991
992#ifdef CONFIG_XFRM
993static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
994{
995 xdst->child = child;
996}
997
998static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
999{
1000 xfrm_pols_put(xdst->pols, xdst->num_pols);
1001 dst_release(xdst->route);
1002 if (likely(xdst->u.dst.xfrm))
1003 xfrm_state_put(xdst->u.dst.xfrm);
1004}
1005#endif
1006
1007void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1008
1009struct xfrm_if_parms {
1010 int link; /* ifindex of underlying L2 interface */
1011 u32 if_id; /* interface identifyer */
1012 bool collect_md;
1013};
1014
1015struct xfrm_if {
1016 struct xfrm_if __rcu *next; /* next interface in list */
1017 struct net_device *dev; /* virtual device associated with interface */
1018 struct net *net; /* netns for packet i/o */
1019 struct xfrm_if_parms p; /* interface parms */
1020
1021 struct gro_cells gro_cells;
1022};
1023
1024struct xfrm_offload {
1025 /* Output sequence number for replay protection on offloading. */
1026 struct {
1027 __u32 low;
1028 __u32 hi;
1029 } seq;
1030
1031 __u32 flags;
1032#define SA_DELETE_REQ 1
1033#define CRYPTO_DONE 2
1034#define CRYPTO_NEXT_DONE 4
1035#define CRYPTO_FALLBACK 8
1036#define XFRM_GSO_SEGMENT 16
1037#define XFRM_GRO 32
1038/* 64 is free */
1039#define XFRM_DEV_RESUME 128
1040#define XFRM_XMIT 256
1041
1042 __u32 status;
1043#define CRYPTO_SUCCESS 1
1044#define CRYPTO_GENERIC_ERROR 2
1045#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1046#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1047#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1048#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1049#define CRYPTO_INVALID_PACKET_SYNTAX 64
1050#define CRYPTO_INVALID_PROTOCOL 128
1051
1052 /* Used to keep whole l2 header for transport mode GRO */
1053 __u32 orig_mac_len;
1054
1055 __u8 proto;
1056 __u8 inner_ipproto;
1057};
1058
1059struct sec_path {
1060 int len;
1061 int olen;
1062 int verified_cnt;
1063
1064 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1065 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1066};
1067
1068struct sec_path *secpath_set(struct sk_buff *skb);
1069
1070static inline void
1071secpath_reset(struct sk_buff *skb)
1072{
1073#ifdef CONFIG_XFRM
1074 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1075#endif
1076}
1077
1078static inline int
1079xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1080{
1081 switch (family) {
1082 case AF_INET:
1083 return addr->a4 == 0;
1084 case AF_INET6:
1085 return ipv6_addr_any(&addr->in6);
1086 }
1087 return 0;
1088}
1089
1090static inline int
1091__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1092{
1093 return (tmpl->saddr.a4 &&
1094 tmpl->saddr.a4 != x->props.saddr.a4);
1095}
1096
1097static inline int
1098__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1099{
1100 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1101 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1102}
1103
1104static inline int
1105xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1106{
1107 switch (family) {
1108 case AF_INET:
1109 return __xfrm4_state_addr_cmp(tmpl, x);
1110 case AF_INET6:
1111 return __xfrm6_state_addr_cmp(tmpl, x);
1112 }
1113 return !0;
1114}
1115
1116#ifdef CONFIG_XFRM
1117static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1118{
1119 struct sec_path *sp = skb_sec_path(skb);
1120
1121 return sp->xvec[sp->len - 1];
1122}
1123#endif
1124
1125static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1126{
1127#ifdef CONFIG_XFRM
1128 struct sec_path *sp = skb_sec_path(skb);
1129
1130 if (!sp || !sp->olen || sp->len != sp->olen)
1131 return NULL;
1132
1133 return &sp->ovec[sp->olen - 1];
1134#else
1135 return NULL;
1136#endif
1137}
1138
1139#ifdef CONFIG_XFRM
1140int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1141 unsigned short family);
1142
1143static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1144 int dir)
1145{
1146 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1147 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1148
1149 return false;
1150}
1151
1152static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1153 int dir, unsigned short family)
1154{
1155 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1156 /* same dst may be used for traffic originating from
1157 * devices with different policy settings.
1158 */
1159 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1160 }
1161 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1162}
1163
1164static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1165 struct sk_buff *skb,
1166 unsigned int family, int reverse)
1167{
1168 struct net *net = dev_net(skb->dev);
1169 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1170 struct xfrm_offload *xo = xfrm_offload(skb);
1171 struct xfrm_state *x;
1172
1173 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1174 return __xfrm_policy_check(sk, ndir, skb, family);
1175
1176 if (xo) {
1177 x = xfrm_input_state(skb);
1178 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1179 return (xo->flags & CRYPTO_DONE) &&
1180 (xo->status & CRYPTO_SUCCESS);
1181 }
1182
1183 return __xfrm_check_nopolicy(net, skb, dir) ||
1184 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1185 __xfrm_policy_check(sk, ndir, skb, family);
1186}
1187
1188static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1189{
1190 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1191}
1192
1193static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1194{
1195 return xfrm_policy_check(sk, dir, skb, AF_INET);
1196}
1197
1198static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1199{
1200 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1201}
1202
1203static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1204 struct sk_buff *skb)
1205{
1206 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1207}
1208
1209static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1210 struct sk_buff *skb)
1211{
1212 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1213}
1214
1215int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1216 unsigned int family, int reverse);
1217
1218static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1219 unsigned int family)
1220{
1221 return __xfrm_decode_session(net, skb, fl, family, 0);
1222}
1223
1224static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1225 struct flowi *fl,
1226 unsigned int family)
1227{
1228 return __xfrm_decode_session(net, skb, fl, family, 1);
1229}
1230
1231int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1232
1233static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1234{
1235 struct net *net = dev_net(skb->dev);
1236
1237 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1238 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1239 return true;
1240
1241 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1242 __xfrm_route_forward(skb, family);
1243}
1244
1245static inline int xfrm4_route_forward(struct sk_buff *skb)
1246{
1247 return xfrm_route_forward(skb, AF_INET);
1248}
1249
1250static inline int xfrm6_route_forward(struct sk_buff *skb)
1251{
1252 return xfrm_route_forward(skb, AF_INET6);
1253}
1254
1255int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1256
1257static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1258{
1259 if (!sk_fullsock(osk))
1260 return 0;
1261 sk->sk_policy[0] = NULL;
1262 sk->sk_policy[1] = NULL;
1263 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1264 return __xfrm_sk_clone_policy(sk, osk);
1265 return 0;
1266}
1267
1268int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1269
1270static inline void xfrm_sk_free_policy(struct sock *sk)
1271{
1272 struct xfrm_policy *pol;
1273
1274 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1275 if (unlikely(pol != NULL)) {
1276 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1277 sk->sk_policy[0] = NULL;
1278 }
1279 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1280 if (unlikely(pol != NULL)) {
1281 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1282 sk->sk_policy[1] = NULL;
1283 }
1284}
1285
1286#else
1287
1288static inline void xfrm_sk_free_policy(struct sock *sk) {}
1289static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1290static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1291static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1292static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1293{
1294 return 1;
1295}
1296static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1297{
1298 return 1;
1299}
1300static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1301{
1302 return 1;
1303}
1304static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1305 struct flowi *fl,
1306 unsigned int family)
1307{
1308 return -ENOSYS;
1309}
1310static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1311 struct sk_buff *skb)
1312{
1313 return 1;
1314}
1315static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1316 struct sk_buff *skb)
1317{
1318 return 1;
1319}
1320#endif
1321
1322static __inline__
1323xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1324{
1325 switch (family){
1326 case AF_INET:
1327 return (xfrm_address_t *)&fl->u.ip4.daddr;
1328 case AF_INET6:
1329 return (xfrm_address_t *)&fl->u.ip6.daddr;
1330 }
1331 return NULL;
1332}
1333
1334static __inline__
1335xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1336{
1337 switch (family){
1338 case AF_INET:
1339 return (xfrm_address_t *)&fl->u.ip4.saddr;
1340 case AF_INET6:
1341 return (xfrm_address_t *)&fl->u.ip6.saddr;
1342 }
1343 return NULL;
1344}
1345
1346static __inline__
1347void xfrm_flowi_addr_get(const struct flowi *fl,
1348 xfrm_address_t *saddr, xfrm_address_t *daddr,
1349 unsigned short family)
1350{
1351 switch(family) {
1352 case AF_INET:
1353 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1354 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1355 break;
1356 case AF_INET6:
1357 saddr->in6 = fl->u.ip6.saddr;
1358 daddr->in6 = fl->u.ip6.daddr;
1359 break;
1360 }
1361}
1362
1363static __inline__ int
1364__xfrm4_state_addr_check(const struct xfrm_state *x,
1365 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1366{
1367 if (daddr->a4 == x->id.daddr.a4 &&
1368 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1369 return 1;
1370 return 0;
1371}
1372
1373static __inline__ int
1374__xfrm6_state_addr_check(const struct xfrm_state *x,
1375 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1376{
1377 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1378 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1379 ipv6_addr_any((struct in6_addr *)saddr) ||
1380 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1381 return 1;
1382 return 0;
1383}
1384
1385static __inline__ int
1386xfrm_state_addr_check(const struct xfrm_state *x,
1387 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1388 unsigned short family)
1389{
1390 switch (family) {
1391 case AF_INET:
1392 return __xfrm4_state_addr_check(x, daddr, saddr);
1393 case AF_INET6:
1394 return __xfrm6_state_addr_check(x, daddr, saddr);
1395 }
1396 return 0;
1397}
1398
1399static __inline__ int
1400xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1401 unsigned short family)
1402{
1403 switch (family) {
1404 case AF_INET:
1405 return __xfrm4_state_addr_check(x,
1406 (const xfrm_address_t *)&fl->u.ip4.daddr,
1407 (const xfrm_address_t *)&fl->u.ip4.saddr);
1408 case AF_INET6:
1409 return __xfrm6_state_addr_check(x,
1410 (const xfrm_address_t *)&fl->u.ip6.daddr,
1411 (const xfrm_address_t *)&fl->u.ip6.saddr);
1412 }
1413 return 0;
1414}
1415
1416static inline int xfrm_state_kern(const struct xfrm_state *x)
1417{
1418 return atomic_read(&x->tunnel_users);
1419}
1420
1421static inline bool xfrm_id_proto_valid(u8 proto)
1422{
1423 switch (proto) {
1424 case IPPROTO_AH:
1425 case IPPROTO_ESP:
1426 case IPPROTO_COMP:
1427#if IS_ENABLED(CONFIG_IPV6)
1428 case IPPROTO_ROUTING:
1429 case IPPROTO_DSTOPTS:
1430#endif
1431 return true;
1432 default:
1433 return false;
1434 }
1435}
1436
1437/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1438static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1439{
1440 return (!userproto || proto == userproto ||
1441 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1442 proto == IPPROTO_ESP ||
1443 proto == IPPROTO_COMP)));
1444}
1445
1446/*
1447 * xfrm algorithm information
1448 */
1449struct xfrm_algo_aead_info {
1450 char *geniv;
1451 u16 icv_truncbits;
1452};
1453
1454struct xfrm_algo_auth_info {
1455 u16 icv_truncbits;
1456 u16 icv_fullbits;
1457};
1458
1459struct xfrm_algo_encr_info {
1460 char *geniv;
1461 u16 blockbits;
1462 u16 defkeybits;
1463};
1464
1465struct xfrm_algo_comp_info {
1466 u16 threshold;
1467};
1468
1469struct xfrm_algo_desc {
1470 char *name;
1471 char *compat;
1472 u8 available:1;
1473 u8 pfkey_supported:1;
1474 union {
1475 struct xfrm_algo_aead_info aead;
1476 struct xfrm_algo_auth_info auth;
1477 struct xfrm_algo_encr_info encr;
1478 struct xfrm_algo_comp_info comp;
1479 } uinfo;
1480 struct sadb_alg desc;
1481};
1482
1483/* XFRM protocol handlers. */
1484struct xfrm4_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, u32 info);
1490
1491 struct xfrm4_protocol __rcu *next;
1492 int priority;
1493};
1494
1495struct xfrm6_protocol {
1496 int (*handler)(struct sk_buff *skb);
1497 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1498 int encap_type);
1499 int (*cb_handler)(struct sk_buff *skb, int err);
1500 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1501 u8 type, u8 code, int offset, __be32 info);
1502
1503 struct xfrm6_protocol __rcu *next;
1504 int priority;
1505};
1506
1507/* XFRM tunnel handlers. */
1508struct xfrm_tunnel {
1509 int (*handler)(struct sk_buff *skb);
1510 int (*cb_handler)(struct sk_buff *skb, int err);
1511 int (*err_handler)(struct sk_buff *skb, u32 info);
1512
1513 struct xfrm_tunnel __rcu *next;
1514 int priority;
1515};
1516
1517struct xfrm6_tunnel {
1518 int (*handler)(struct sk_buff *skb);
1519 int (*cb_handler)(struct sk_buff *skb, int err);
1520 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1521 u8 type, u8 code, int offset, __be32 info);
1522 struct xfrm6_tunnel __rcu *next;
1523 int priority;
1524};
1525
1526void xfrm_init(void);
1527void xfrm4_init(void);
1528int xfrm_state_init(struct net *net);
1529void xfrm_state_fini(struct net *net);
1530void xfrm4_state_init(void);
1531void xfrm4_protocol_init(void);
1532#ifdef CONFIG_XFRM
1533int xfrm6_init(void);
1534void xfrm6_fini(void);
1535int xfrm6_state_init(void);
1536void xfrm6_state_fini(void);
1537int xfrm6_protocol_init(void);
1538void xfrm6_protocol_fini(void);
1539#else
1540static inline int xfrm6_init(void)
1541{
1542 return 0;
1543}
1544static inline void xfrm6_fini(void)
1545{
1546 ;
1547}
1548#endif
1549
1550#ifdef CONFIG_XFRM_STATISTICS
1551int xfrm_proc_init(struct net *net);
1552void xfrm_proc_fini(struct net *net);
1553#endif
1554
1555int xfrm_sysctl_init(struct net *net);
1556#ifdef CONFIG_SYSCTL
1557void xfrm_sysctl_fini(struct net *net);
1558#else
1559static inline void xfrm_sysctl_fini(struct net *net)
1560{
1561}
1562#endif
1563
1564void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1565 struct xfrm_address_filter *filter);
1566int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1567 int (*func)(struct xfrm_state *, int, void*), void *);
1568void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1569struct xfrm_state *xfrm_state_alloc(struct net *net);
1570void xfrm_state_free(struct xfrm_state *x);
1571struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1572 const xfrm_address_t *saddr,
1573 const struct flowi *fl,
1574 struct xfrm_tmpl *tmpl,
1575 struct xfrm_policy *pol, int *err,
1576 unsigned short family, u32 if_id);
1577struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1578 xfrm_address_t *daddr,
1579 xfrm_address_t *saddr,
1580 unsigned short family,
1581 u8 mode, u8 proto, u32 reqid);
1582struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1583 unsigned short family);
1584int xfrm_state_check_expire(struct xfrm_state *x);
1585void xfrm_state_update_stats(struct net *net);
1586#ifdef CONFIG_XFRM_OFFLOAD
1587static inline void xfrm_dev_state_update_stats(struct xfrm_state *x)
1588{
1589 struct xfrm_dev_offload *xdo = &x->xso;
1590 struct net_device *dev = xdo->dev;
1591
1592 if (dev && dev->xfrmdev_ops &&
1593 dev->xfrmdev_ops->xdo_dev_state_update_stats)
1594 dev->xfrmdev_ops->xdo_dev_state_update_stats(x);
1595
1596}
1597#else
1598static inline void xfrm_dev_state_update_stats(struct xfrm_state *x) {}
1599#endif
1600void xfrm_state_insert(struct xfrm_state *x);
1601int xfrm_state_add(struct xfrm_state *x);
1602int xfrm_state_update(struct xfrm_state *x);
1603struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1604 const xfrm_address_t *daddr, __be32 spi,
1605 u8 proto, unsigned short family);
1606struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1607 const xfrm_address_t *daddr,
1608 const xfrm_address_t *saddr,
1609 u8 proto,
1610 unsigned short family);
1611#ifdef CONFIG_XFRM_SUB_POLICY
1612void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1613 unsigned short family);
1614void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1615 unsigned short family);
1616#else
1617static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1618 int n, unsigned short family)
1619{
1620}
1621
1622static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1623 int n, unsigned short family)
1624{
1625}
1626#endif
1627
1628struct xfrmk_sadinfo {
1629 u32 sadhcnt; /* current hash bkts */
1630 u32 sadhmcnt; /* max allowed hash bkts */
1631 u32 sadcnt; /* current running count */
1632};
1633
1634struct xfrmk_spdinfo {
1635 u32 incnt;
1636 u32 outcnt;
1637 u32 fwdcnt;
1638 u32 inscnt;
1639 u32 outscnt;
1640 u32 fwdscnt;
1641 u32 spdhcnt;
1642 u32 spdhmcnt;
1643};
1644
1645struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1646int xfrm_state_delete(struct xfrm_state *x);
1647int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1648int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1649int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1650 bool task_valid);
1651void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1652void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1653u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1654int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1655u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1656int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1657 struct netlink_ext_ack *extack);
1658int xfrm_init_state(struct xfrm_state *x);
1659int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1660int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1661int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1662 int (*finish)(struct net *, struct sock *,
1663 struct sk_buff *));
1664int xfrm_trans_queue(struct sk_buff *skb,
1665 int (*finish)(struct net *, struct sock *,
1666 struct sk_buff *));
1667int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1668int xfrm_output(struct sock *sk, struct sk_buff *skb);
1669
1670#if IS_ENABLED(CONFIG_NET_PKTGEN)
1671int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1672#endif
1673
1674void xfrm_local_error(struct sk_buff *skb, int mtu);
1675int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1676 int encap_type);
1677int xfrm4_transport_finish(struct sk_buff *skb, int async);
1678int xfrm4_rcv(struct sk_buff *skb);
1679
1680static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1681{
1682 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1683 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1684 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1685 return xfrm_input(skb, nexthdr, spi, 0);
1686}
1687
1688int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1689int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1690int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1691int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1692int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1693void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1694int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1695 struct ip6_tnl *t);
1696int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1697 int encap_type);
1698int xfrm6_transport_finish(struct sk_buff *skb, int async);
1699int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1700int xfrm6_rcv(struct sk_buff *skb);
1701int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1702 xfrm_address_t *saddr, u8 proto);
1703void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1704int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1705int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1706int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1707int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1708__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1709__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1710int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1711
1712#ifdef CONFIG_XFRM
1713void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1714int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1715int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1716struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1717 struct sk_buff *skb);
1718struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1719 struct sk_buff *skb);
1720int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1721 int optlen);
1722#else
1723static inline int xfrm_user_policy(struct sock *sk, int optname,
1724 sockptr_t optval, int optlen)
1725{
1726 return -ENOPROTOOPT;
1727}
1728#endif
1729
1730struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1731 const xfrm_address_t *saddr,
1732 const xfrm_address_t *daddr,
1733 int family, u32 mark);
1734
1735struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1736
1737void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1738int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1739 int (*func)(struct xfrm_policy *, int, int, void*),
1740 void *);
1741void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1742int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1743struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1744 const struct xfrm_mark *mark,
1745 u32 if_id, u8 type, int dir,
1746 struct xfrm_selector *sel,
1747 struct xfrm_sec_ctx *ctx, int delete,
1748 int *err);
1749struct xfrm_policy *xfrm_policy_byid(struct net *net,
1750 const struct xfrm_mark *mark, u32 if_id,
1751 u8 type, int dir, u32 id, int delete,
1752 int *err);
1753int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1754void xfrm_policy_hash_rebuild(struct net *net);
1755u32 xfrm_get_acqseq(void);
1756int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1757int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1758 struct netlink_ext_ack *extack);
1759struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1760 u8 mode, u32 reqid, u32 if_id, u8 proto,
1761 const xfrm_address_t *daddr,
1762 const xfrm_address_t *saddr, int create,
1763 unsigned short family);
1764int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1765
1766#ifdef CONFIG_XFRM_MIGRATE
1767int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1768 const struct xfrm_migrate *m, int num_bundles,
1769 const struct xfrm_kmaddress *k,
1770 const struct xfrm_encap_tmpl *encap);
1771struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1772 u32 if_id);
1773struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1774 struct xfrm_migrate *m,
1775 struct xfrm_encap_tmpl *encap);
1776int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1777 struct xfrm_migrate *m, int num_bundles,
1778 struct xfrm_kmaddress *k, struct net *net,
1779 struct xfrm_encap_tmpl *encap, u32 if_id,
1780 struct netlink_ext_ack *extack);
1781#endif
1782
1783int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1784void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1785int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1786 xfrm_address_t *addr);
1787
1788void xfrm_input_init(void);
1789int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1790
1791void xfrm_probe_algs(void);
1792int xfrm_count_pfkey_auth_supported(void);
1793int xfrm_count_pfkey_enc_supported(void);
1794struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1795struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1796struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1797struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1798struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1799struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1800struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1801struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1802struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1803 int probe);
1804
1805static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1806 const xfrm_address_t *b)
1807{
1808 return ipv6_addr_equal((const struct in6_addr *)a,
1809 (const struct in6_addr *)b);
1810}
1811
1812static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1813 const xfrm_address_t *b,
1814 sa_family_t family)
1815{
1816 switch (family) {
1817 default:
1818 case AF_INET:
1819 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1820 case AF_INET6:
1821 return xfrm6_addr_equal(a, b);
1822 }
1823}
1824
1825static inline int xfrm_policy_id2dir(u32 index)
1826{
1827 return index & 7;
1828}
1829
1830#ifdef CONFIG_XFRM
1831void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1832int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1833void xfrm_replay_notify(struct xfrm_state *x, int event);
1834int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1835int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1836
1837static inline int xfrm_aevent_is_on(struct net *net)
1838{
1839 struct sock *nlsk;
1840 int ret = 0;
1841
1842 rcu_read_lock();
1843 nlsk = rcu_dereference(net->xfrm.nlsk);
1844 if (nlsk)
1845 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1846 rcu_read_unlock();
1847 return ret;
1848}
1849
1850static inline int xfrm_acquire_is_on(struct net *net)
1851{
1852 struct sock *nlsk;
1853 int ret = 0;
1854
1855 rcu_read_lock();
1856 nlsk = rcu_dereference(net->xfrm.nlsk);
1857 if (nlsk)
1858 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1859 rcu_read_unlock();
1860
1861 return ret;
1862}
1863#endif
1864
1865static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1866{
1867 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1868}
1869
1870static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1871{
1872 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1873}
1874
1875static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1876{
1877 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1878}
1879
1880static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1881{
1882 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1883}
1884
1885#ifdef CONFIG_XFRM_MIGRATE
1886static inline int xfrm_replay_clone(struct xfrm_state *x,
1887 struct xfrm_state *orig)
1888{
1889
1890 x->replay_esn = kmemdup(orig->replay_esn,
1891 xfrm_replay_state_esn_len(orig->replay_esn),
1892 GFP_KERNEL);
1893 if (!x->replay_esn)
1894 return -ENOMEM;
1895 x->preplay_esn = kmemdup(orig->preplay_esn,
1896 xfrm_replay_state_esn_len(orig->preplay_esn),
1897 GFP_KERNEL);
1898 if (!x->preplay_esn)
1899 return -ENOMEM;
1900
1901 return 0;
1902}
1903
1904static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1905{
1906 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1907}
1908
1909
1910static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1911{
1912 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1913}
1914
1915static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1916{
1917 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1918}
1919
1920static inline void xfrm_states_put(struct xfrm_state **states, int n)
1921{
1922 int i;
1923 for (i = 0; i < n; i++)
1924 xfrm_state_put(*(states + i));
1925}
1926
1927static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1928{
1929 int i;
1930 for (i = 0; i < n; i++)
1931 xfrm_state_delete(*(states + i));
1932}
1933#endif
1934
1935void __init xfrm_dev_init(void);
1936
1937#ifdef CONFIG_XFRM_OFFLOAD
1938void xfrm_dev_resume(struct sk_buff *skb);
1939void xfrm_dev_backlog(struct softnet_data *sd);
1940struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1941int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1942 struct xfrm_user_offload *xuo,
1943 struct netlink_ext_ack *extack);
1944int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1945 struct xfrm_user_offload *xuo, u8 dir,
1946 struct netlink_ext_ack *extack);
1947bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1948
1949static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1950{
1951 struct xfrm_dev_offload *xso = &x->xso;
1952
1953 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1954 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1955}
1956
1957static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1958{
1959 struct xfrm_state *x = dst->xfrm;
1960 struct xfrm_dst *xdst;
1961
1962 if (!x || !x->type_offload)
1963 return false;
1964
1965 xdst = (struct xfrm_dst *) dst;
1966 if (!x->xso.offload_handle && !xdst->child->xfrm)
1967 return true;
1968 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1969 !xdst->child->xfrm)
1970 return true;
1971
1972 return false;
1973}
1974
1975static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1976{
1977 struct xfrm_dev_offload *xso = &x->xso;
1978
1979 if (xso->dev)
1980 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1981}
1982
1983static inline void xfrm_dev_state_free(struct xfrm_state *x)
1984{
1985 struct xfrm_dev_offload *xso = &x->xso;
1986 struct net_device *dev = xso->dev;
1987
1988 if (dev && dev->xfrmdev_ops) {
1989 if (dev->xfrmdev_ops->xdo_dev_state_free)
1990 dev->xfrmdev_ops->xdo_dev_state_free(x);
1991 xso->dev = NULL;
1992 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1993 netdev_put(dev, &xso->dev_tracker);
1994 }
1995}
1996
1997static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1998{
1999 struct xfrm_dev_offload *xdo = &x->xdo;
2000 struct net_device *dev = xdo->dev;
2001
2002 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
2003 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
2004}
2005
2006static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2007{
2008 struct xfrm_dev_offload *xdo = &x->xdo;
2009 struct net_device *dev = xdo->dev;
2010
2011 if (dev && dev->xfrmdev_ops) {
2012 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2013 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2014 xdo->dev = NULL;
2015 netdev_put(dev, &xdo->dev_tracker);
2016 }
2017}
2018#else
2019static inline void xfrm_dev_resume(struct sk_buff *skb)
2020{
2021}
2022
2023static inline void xfrm_dev_backlog(struct softnet_data *sd)
2024{
2025}
2026
2027static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2028{
2029 return skb;
2030}
2031
2032static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2033{
2034 return 0;
2035}
2036
2037static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2038{
2039}
2040
2041static inline void xfrm_dev_state_free(struct xfrm_state *x)
2042{
2043}
2044
2045static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2046 struct xfrm_user_offload *xuo, u8 dir,
2047 struct netlink_ext_ack *extack)
2048{
2049 return 0;
2050}
2051
2052static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2053{
2054}
2055
2056static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2057{
2058}
2059
2060static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2061{
2062 return false;
2063}
2064
2065static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2066{
2067}
2068
2069static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2070{
2071 return false;
2072}
2073#endif
2074
2075static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2076{
2077 if (attrs[XFRMA_MARK])
2078 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2079 else
2080 m->v = m->m = 0;
2081
2082 return m->v & m->m;
2083}
2084
2085static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2086{
2087 int ret = 0;
2088
2089 if (m->m | m->v)
2090 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2091 return ret;
2092}
2093
2094static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2095{
2096 struct xfrm_mark *m = &x->props.smark;
2097
2098 return (m->v & m->m) | (mark & ~m->m);
2099}
2100
2101static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2102{
2103 int ret = 0;
2104
2105 if (if_id)
2106 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2107 return ret;
2108}
2109
2110static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2111 unsigned int family)
2112{
2113 bool tunnel = false;
2114
2115 switch(family) {
2116 case AF_INET:
2117 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2118 tunnel = true;
2119 break;
2120 case AF_INET6:
2121 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2122 tunnel = true;
2123 break;
2124 }
2125 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2126 return -EINVAL;
2127
2128 return 0;
2129}
2130
2131extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2132extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2133
2134struct xfrm_translator {
2135 /* Allocate frag_list and put compat translation there */
2136 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2137
2138 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2139 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2140 int maxtype, const struct nla_policy *policy,
2141 struct netlink_ext_ack *extack);
2142
2143 /* Translate 32-bit user_policy from sockptr */
2144 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2145
2146 struct module *owner;
2147};
2148
2149#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2150extern int xfrm_register_translator(struct xfrm_translator *xtr);
2151extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2152extern struct xfrm_translator *xfrm_get_translator(void);
2153extern void xfrm_put_translator(struct xfrm_translator *xtr);
2154#else
2155static inline struct xfrm_translator *xfrm_get_translator(void)
2156{
2157 return NULL;
2158}
2159static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2160{
2161}
2162#endif
2163
2164#if IS_ENABLED(CONFIG_IPV6)
2165static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2166{
2167 int proto;
2168
2169 if (!sk || sk->sk_family != AF_INET6)
2170 return false;
2171
2172 proto = sk->sk_protocol;
2173 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2174 return inet6_test_bit(DONTFRAG, sk);
2175
2176 return false;
2177}
2178#endif
2179
2180#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2181 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2182
2183extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2184
2185int register_xfrm_interface_bpf(void);
2186
2187#else
2188
2189static inline int register_xfrm_interface_bpf(void)
2190{
2191 return 0;
2192}
2193
2194#endif
2195
2196#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF)
2197int register_xfrm_state_bpf(void);
2198#else
2199static inline int register_xfrm_state_bpf(void)
2200{
2201 return 0;
2202}
2203#endif
2204
2205#endif /* _NET_XFRM_H */