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