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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#include <linux/sockptr.h>
19
20#include <net/sock.h>
21#include <net/dst.h>
22#include <net/ip.h>
23#include <net/route.h>
24#include <net/ipv6.h>
25#include <net/ip6_fib.h>
26#include <net/flow.h>
27#include <net/gro_cells.h>
28
29#include <linux/interrupt.h>
30
31#ifdef CONFIG_XFRM_STATISTICS
32#include <net/snmp.h>
33#endif
34
35#define XFRM_PROTO_ESP 50
36#define XFRM_PROTO_AH 51
37#define XFRM_PROTO_COMP 108
38#define XFRM_PROTO_IPIP 4
39#define XFRM_PROTO_IPV6 41
40#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
41#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
42
43#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
44#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
45#define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51
52#ifdef CONFIG_XFRM_STATISTICS
53#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54#else
55#define XFRM_INC_STATS(net, field) ((void)(net))
56#endif
57
58
59/* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 u8 dying;
124 u8 proto;
125 u32 seq;
126 struct xfrm_address_filter *filter;
127};
128
129struct xfrm_state_offload {
130 struct net_device *dev;
131 struct net_device *real_dev;
132 unsigned long offload_handle;
133 unsigned int num_exthdrs;
134 u8 flags;
135};
136
137struct xfrm_mode {
138 u8 encap;
139 u8 family;
140 u8 flags;
141};
142
143/* Flags for xfrm_mode. */
144enum {
145 XFRM_MODE_FLAG_TUNNEL = 1,
146};
147
148enum xfrm_replay_mode {
149 XFRM_REPLAY_MODE_LEGACY,
150 XFRM_REPLAY_MODE_BMP,
151 XFRM_REPLAY_MODE_ESN,
152};
153
154/* Full description of state of transformer. */
155struct xfrm_state {
156 possible_net_t xs_net;
157 union {
158 struct hlist_node gclist;
159 struct hlist_node bydst;
160 };
161 struct hlist_node bysrc;
162 struct hlist_node byspi;
163 struct hlist_node byseq;
164
165 refcount_t refcnt;
166 spinlock_t lock;
167
168 struct xfrm_id id;
169 struct xfrm_selector sel;
170 struct xfrm_mark mark;
171 u32 if_id;
172 u32 tfcpad;
173
174 u32 genid;
175
176 /* Key manager bits */
177 struct xfrm_state_walk km;
178
179 /* Parameters of this state. */
180 struct {
181 u32 reqid;
182 u8 mode;
183 u8 replay_window;
184 u8 aalgo, ealgo, calgo;
185 u8 flags;
186 u16 family;
187 xfrm_address_t saddr;
188 int header_len;
189 int trailer_len;
190 u32 extra_flags;
191 struct xfrm_mark smark;
192 } props;
193
194 struct xfrm_lifetime_cfg lft;
195
196 /* Data for transformer */
197 struct xfrm_algo_auth *aalg;
198 struct xfrm_algo *ealg;
199 struct xfrm_algo *calg;
200 struct xfrm_algo_aead *aead;
201 const char *geniv;
202
203 /* Data for encapsulator */
204 struct xfrm_encap_tmpl *encap;
205 struct sock __rcu *encap_sk;
206
207 /* Data for care-of address */
208 xfrm_address_t *coaddr;
209
210 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
211 struct xfrm_state *tunnel;
212
213 /* If a tunnel, number of users + 1 */
214 atomic_t tunnel_users;
215
216 /* State for replay detection */
217 struct xfrm_replay_state replay;
218 struct xfrm_replay_state_esn *replay_esn;
219
220 /* Replay detection state at the time we sent the last notification */
221 struct xfrm_replay_state preplay;
222 struct xfrm_replay_state_esn *preplay_esn;
223
224 /* replay detection mode */
225 enum xfrm_replay_mode repl_mode;
226 /* internal flag that only holds state for delayed aevent at the
227 * moment
228 */
229 u32 xflags;
230
231 /* Replay detection notification settings */
232 u32 replay_maxage;
233 u32 replay_maxdiff;
234
235 /* Replay detection notification timer */
236 struct timer_list rtimer;
237
238 /* Statistics */
239 struct xfrm_stats stats;
240
241 struct xfrm_lifetime_cur curlft;
242 struct hrtimer mtimer;
243
244 struct xfrm_state_offload xso;
245
246 /* used to fix curlft->add_time when changing date */
247 long saved_tmo;
248
249 /* Last used time */
250 time64_t lastused;
251
252 struct page_frag xfrag;
253
254 /* Reference to data common to all the instances of this
255 * transformer. */
256 const struct xfrm_type *type;
257 struct xfrm_mode inner_mode;
258 struct xfrm_mode inner_mode_iaf;
259 struct xfrm_mode outer_mode;
260
261 const struct xfrm_type_offload *type_offload;
262
263 /* Security context */
264 struct xfrm_sec_ctx *security;
265
266 /* Private data of this transformer, format is opaque,
267 * interpreted by xfrm_type methods. */
268 void *data;
269};
270
271static inline struct net *xs_net(struct xfrm_state *x)
272{
273 return read_pnet(&x->xs_net);
274}
275
276/* xflags - make enum if more show up */
277#define XFRM_TIME_DEFER 1
278#define XFRM_SOFT_EXPIRE 2
279
280enum {
281 XFRM_STATE_VOID,
282 XFRM_STATE_ACQ,
283 XFRM_STATE_VALID,
284 XFRM_STATE_ERROR,
285 XFRM_STATE_EXPIRED,
286 XFRM_STATE_DEAD
287};
288
289/* callback structure passed from either netlink or pfkey */
290struct km_event {
291 union {
292 u32 hard;
293 u32 proto;
294 u32 byid;
295 u32 aevent;
296 u32 type;
297 } data;
298
299 u32 seq;
300 u32 portid;
301 u32 event;
302 struct net *net;
303};
304
305struct xfrm_if_cb {
306 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
307 unsigned short family);
308};
309
310void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
311void xfrm_if_unregister_cb(void);
312
313struct net_device;
314struct xfrm_type;
315struct xfrm_dst;
316struct xfrm_policy_afinfo {
317 struct dst_ops *dst_ops;
318 struct dst_entry *(*dst_lookup)(struct net *net,
319 int tos, int oif,
320 const xfrm_address_t *saddr,
321 const xfrm_address_t *daddr,
322 u32 mark);
323 int (*get_saddr)(struct net *net, int oif,
324 xfrm_address_t *saddr,
325 xfrm_address_t *daddr,
326 u32 mark);
327 int (*fill_dst)(struct xfrm_dst *xdst,
328 struct net_device *dev,
329 const struct flowi *fl);
330 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
331};
332
333int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
334void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
335void km_policy_notify(struct xfrm_policy *xp, int dir,
336 const struct km_event *c);
337void km_state_notify(struct xfrm_state *x, const struct km_event *c);
338
339struct xfrm_tmpl;
340int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
341 struct xfrm_policy *pol);
342void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
343int __xfrm_state_delete(struct xfrm_state *x);
344
345struct xfrm_state_afinfo {
346 u8 family;
347 u8 proto;
348
349 const struct xfrm_type_offload *type_offload_esp;
350
351 const struct xfrm_type *type_esp;
352 const struct xfrm_type *type_ipip;
353 const struct xfrm_type *type_ipip6;
354 const struct xfrm_type *type_comp;
355 const struct xfrm_type *type_ah;
356 const struct xfrm_type *type_routing;
357 const struct xfrm_type *type_dstopts;
358
359 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
360 int (*transport_finish)(struct sk_buff *skb,
361 int async);
362 void (*local_error)(struct sk_buff *skb, u32 mtu);
363};
364
365int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
366int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
367struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
368struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
369
370struct xfrm_input_afinfo {
371 u8 family;
372 bool is_ipip;
373 int (*callback)(struct sk_buff *skb, u8 protocol,
374 int err);
375};
376
377int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
378int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
379
380void xfrm_flush_gc(void);
381void xfrm_state_delete_tunnel(struct xfrm_state *x);
382
383struct xfrm_type {
384 struct module *owner;
385 u8 proto;
386 u8 flags;
387#define XFRM_TYPE_NON_FRAGMENT 1
388#define XFRM_TYPE_REPLAY_PROT 2
389#define XFRM_TYPE_LOCAL_COADDR 4
390#define XFRM_TYPE_REMOTE_COADDR 8
391
392 int (*init_state)(struct xfrm_state *x);
393 void (*destructor)(struct xfrm_state *);
394 int (*input)(struct xfrm_state *, struct sk_buff *skb);
395 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
396 int (*reject)(struct xfrm_state *, struct sk_buff *,
397 const struct flowi *);
398};
399
400int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
401void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
402
403struct xfrm_type_offload {
404 struct module *owner;
405 u8 proto;
406 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
407 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
408 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
409};
410
411int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
412void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
413
414static inline int xfrm_af2proto(unsigned int family)
415{
416 switch(family) {
417 case AF_INET:
418 return IPPROTO_IPIP;
419 case AF_INET6:
420 return IPPROTO_IPV6;
421 default:
422 return 0;
423 }
424}
425
426static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
427{
428 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
429 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
430 return &x->inner_mode;
431 else
432 return &x->inner_mode_iaf;
433}
434
435struct xfrm_tmpl {
436/* id in template is interpreted as:
437 * daddr - destination of tunnel, may be zero for transport mode.
438 * spi - zero to acquire spi. Not zero if spi is static, then
439 * daddr must be fixed too.
440 * proto - AH/ESP/IPCOMP
441 */
442 struct xfrm_id id;
443
444/* Source address of tunnel. Ignored, if it is not a tunnel. */
445 xfrm_address_t saddr;
446
447 unsigned short encap_family;
448
449 u32 reqid;
450
451/* Mode: transport, tunnel etc. */
452 u8 mode;
453
454/* Sharing mode: unique, this session only, this user only etc. */
455 u8 share;
456
457/* May skip this transfomration if no SA is found */
458 u8 optional;
459
460/* Skip aalgos/ealgos/calgos checks. */
461 u8 allalgs;
462
463/* Bit mask of algos allowed for acquisition */
464 u32 aalgos;
465 u32 ealgos;
466 u32 calgos;
467};
468
469#define XFRM_MAX_DEPTH 6
470#define XFRM_MAX_OFFLOAD_DEPTH 1
471
472struct xfrm_policy_walk_entry {
473 struct list_head all;
474 u8 dead;
475};
476
477struct xfrm_policy_walk {
478 struct xfrm_policy_walk_entry walk;
479 u8 type;
480 u32 seq;
481};
482
483struct xfrm_policy_queue {
484 struct sk_buff_head hold_queue;
485 struct timer_list hold_timer;
486 unsigned long timeout;
487};
488
489struct xfrm_policy {
490 possible_net_t xp_net;
491 struct hlist_node bydst;
492 struct hlist_node byidx;
493
494 /* This lock only affects elements except for entry. */
495 rwlock_t lock;
496 refcount_t refcnt;
497 u32 pos;
498 struct timer_list timer;
499
500 atomic_t genid;
501 u32 priority;
502 u32 index;
503 u32 if_id;
504 struct xfrm_mark mark;
505 struct xfrm_selector selector;
506 struct xfrm_lifetime_cfg lft;
507 struct xfrm_lifetime_cur curlft;
508 struct xfrm_policy_walk_entry walk;
509 struct xfrm_policy_queue polq;
510 bool bydst_reinsert;
511 u8 type;
512 u8 action;
513 u8 flags;
514 u8 xfrm_nr;
515 u16 family;
516 struct xfrm_sec_ctx *security;
517 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
518 struct hlist_node bydst_inexact_list;
519 struct rcu_head rcu;
520};
521
522static inline struct net *xp_net(const struct xfrm_policy *xp)
523{
524 return read_pnet(&xp->xp_net);
525}
526
527struct xfrm_kmaddress {
528 xfrm_address_t local;
529 xfrm_address_t remote;
530 u32 reserved;
531 u16 family;
532};
533
534struct xfrm_migrate {
535 xfrm_address_t old_daddr;
536 xfrm_address_t old_saddr;
537 xfrm_address_t new_daddr;
538 xfrm_address_t new_saddr;
539 u8 proto;
540 u8 mode;
541 u16 reserved;
542 u32 reqid;
543 u16 old_family;
544 u16 new_family;
545};
546
547#define XFRM_KM_TIMEOUT 30
548/* what happened */
549#define XFRM_REPLAY_UPDATE XFRM_AE_CR
550#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
551
552/* default aevent timeout in units of 100ms */
553#define XFRM_AE_ETIME 10
554/* Async Event timer multiplier */
555#define XFRM_AE_ETH_M 10
556/* default seq threshold size */
557#define XFRM_AE_SEQT_SIZE 2
558
559struct xfrm_mgr {
560 struct list_head list;
561 int (*notify)(struct xfrm_state *x, const struct km_event *c);
562 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
563 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
564 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
565 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
566 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
567 int (*migrate)(const struct xfrm_selector *sel,
568 u8 dir, u8 type,
569 const struct xfrm_migrate *m,
570 int num_bundles,
571 const struct xfrm_kmaddress *k,
572 const struct xfrm_encap_tmpl *encap);
573 bool (*is_alive)(const struct km_event *c);
574};
575
576int xfrm_register_km(struct xfrm_mgr *km);
577int xfrm_unregister_km(struct xfrm_mgr *km);
578
579struct xfrm_tunnel_skb_cb {
580 union {
581 struct inet_skb_parm h4;
582 struct inet6_skb_parm h6;
583 } header;
584
585 union {
586 struct ip_tunnel *ip4;
587 struct ip6_tnl *ip6;
588 } tunnel;
589};
590
591#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
592
593/*
594 * This structure is used for the duration where packets are being
595 * transformed by IPsec. As soon as the packet leaves IPsec the
596 * area beyond the generic IP part may be overwritten.
597 */
598struct xfrm_skb_cb {
599 struct xfrm_tunnel_skb_cb header;
600
601 /* Sequence number for replay protection. */
602 union {
603 struct {
604 __u32 low;
605 __u32 hi;
606 } output;
607 struct {
608 __be32 low;
609 __be32 hi;
610 } input;
611 } seq;
612};
613
614#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
615
616/*
617 * This structure is used by the afinfo prepare_input/prepare_output functions
618 * to transmit header information to the mode input/output functions.
619 */
620struct xfrm_mode_skb_cb {
621 struct xfrm_tunnel_skb_cb header;
622
623 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
624 __be16 id;
625 __be16 frag_off;
626
627 /* IP header length (excluding options or extension headers). */
628 u8 ihl;
629
630 /* TOS for IPv4, class for IPv6. */
631 u8 tos;
632
633 /* TTL for IPv4, hop limitfor IPv6. */
634 u8 ttl;
635
636 /* Protocol for IPv4, NH for IPv6. */
637 u8 protocol;
638
639 /* Option length for IPv4, zero for IPv6. */
640 u8 optlen;
641
642 /* Used by IPv6 only, zero for IPv4. */
643 u8 flow_lbl[3];
644};
645
646#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
647
648/*
649 * This structure is used by the input processing to locate the SPI and
650 * related information.
651 */
652struct xfrm_spi_skb_cb {
653 struct xfrm_tunnel_skb_cb header;
654
655 unsigned int daddroff;
656 unsigned int family;
657 __be32 seq;
658};
659
660#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
661
662#ifdef CONFIG_AUDITSYSCALL
663static inline struct audit_buffer *xfrm_audit_start(const char *op)
664{
665 struct audit_buffer *audit_buf = NULL;
666
667 if (audit_enabled == AUDIT_OFF)
668 return NULL;
669 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
670 AUDIT_MAC_IPSEC_EVENT);
671 if (audit_buf == NULL)
672 return NULL;
673 audit_log_format(audit_buf, "op=%s", op);
674 return audit_buf;
675}
676
677static inline void xfrm_audit_helper_usrinfo(bool task_valid,
678 struct audit_buffer *audit_buf)
679{
680 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
681 audit_get_loginuid(current) :
682 INVALID_UID);
683 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
684 AUDIT_SID_UNSET;
685
686 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
687 audit_log_task_context(audit_buf);
688}
689
690void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
691void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
692 bool task_valid);
693void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
694void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
695void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
696 struct sk_buff *skb);
697void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
698 __be32 net_seq);
699void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
700void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
701 __be32 net_seq);
702void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
703 u8 proto);
704#else
705
706static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
707 bool task_valid)
708{
709}
710
711static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
712 bool task_valid)
713{
714}
715
716static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
717 bool task_valid)
718{
719}
720
721static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
722 bool task_valid)
723{
724}
725
726static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
727 struct sk_buff *skb)
728{
729}
730
731static inline void xfrm_audit_state_replay(struct xfrm_state *x,
732 struct sk_buff *skb, __be32 net_seq)
733{
734}
735
736static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
737 u16 family)
738{
739}
740
741static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
742 __be32 net_spi, __be32 net_seq)
743{
744}
745
746static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
747 struct sk_buff *skb, u8 proto)
748{
749}
750#endif /* CONFIG_AUDITSYSCALL */
751
752static inline void xfrm_pol_hold(struct xfrm_policy *policy)
753{
754 if (likely(policy != NULL))
755 refcount_inc(&policy->refcnt);
756}
757
758void xfrm_policy_destroy(struct xfrm_policy *policy);
759
760static inline void xfrm_pol_put(struct xfrm_policy *policy)
761{
762 if (refcount_dec_and_test(&policy->refcnt))
763 xfrm_policy_destroy(policy);
764}
765
766static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
767{
768 int i;
769 for (i = npols - 1; i >= 0; --i)
770 xfrm_pol_put(pols[i]);
771}
772
773void __xfrm_state_destroy(struct xfrm_state *, bool);
774
775static inline void __xfrm_state_put(struct xfrm_state *x)
776{
777 refcount_dec(&x->refcnt);
778}
779
780static inline void xfrm_state_put(struct xfrm_state *x)
781{
782 if (refcount_dec_and_test(&x->refcnt))
783 __xfrm_state_destroy(x, false);
784}
785
786static inline void xfrm_state_put_sync(struct xfrm_state *x)
787{
788 if (refcount_dec_and_test(&x->refcnt))
789 __xfrm_state_destroy(x, true);
790}
791
792static inline void xfrm_state_hold(struct xfrm_state *x)
793{
794 refcount_inc(&x->refcnt);
795}
796
797static inline bool addr_match(const void *token1, const void *token2,
798 unsigned int prefixlen)
799{
800 const __be32 *a1 = token1;
801 const __be32 *a2 = token2;
802 unsigned int pdw;
803 unsigned int pbi;
804
805 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
806 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
807
808 if (pdw)
809 if (memcmp(a1, a2, pdw << 2))
810 return false;
811
812 if (pbi) {
813 __be32 mask;
814
815 mask = htonl((0xffffffff) << (32 - pbi));
816
817 if ((a1[pdw] ^ a2[pdw]) & mask)
818 return false;
819 }
820
821 return true;
822}
823
824static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
825{
826 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
827 if (sizeof(long) == 4 && prefixlen == 0)
828 return true;
829 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
830}
831
832static __inline__
833__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
834{
835 __be16 port;
836 switch(fl->flowi_proto) {
837 case IPPROTO_TCP:
838 case IPPROTO_UDP:
839 case IPPROTO_UDPLITE:
840 case IPPROTO_SCTP:
841 port = uli->ports.sport;
842 break;
843 case IPPROTO_ICMP:
844 case IPPROTO_ICMPV6:
845 port = htons(uli->icmpt.type);
846 break;
847 case IPPROTO_MH:
848 port = htons(uli->mht.type);
849 break;
850 case IPPROTO_GRE:
851 port = htons(ntohl(uli->gre_key) >> 16);
852 break;
853 default:
854 port = 0; /*XXX*/
855 }
856 return port;
857}
858
859static __inline__
860__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
861{
862 __be16 port;
863 switch(fl->flowi_proto) {
864 case IPPROTO_TCP:
865 case IPPROTO_UDP:
866 case IPPROTO_UDPLITE:
867 case IPPROTO_SCTP:
868 port = uli->ports.dport;
869 break;
870 case IPPROTO_ICMP:
871 case IPPROTO_ICMPV6:
872 port = htons(uli->icmpt.code);
873 break;
874 case IPPROTO_GRE:
875 port = htons(ntohl(uli->gre_key) & 0xffff);
876 break;
877 default:
878 port = 0; /*XXX*/
879 }
880 return port;
881}
882
883bool xfrm_selector_match(const struct xfrm_selector *sel,
884 const struct flowi *fl, unsigned short family);
885
886#ifdef CONFIG_SECURITY_NETWORK_XFRM
887/* If neither has a context --> match
888 * Otherwise, both must have a context and the sids, doi, alg must match
889 */
890static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
891{
892 return ((!s1 && !s2) ||
893 (s1 && s2 &&
894 (s1->ctx_sid == s2->ctx_sid) &&
895 (s1->ctx_doi == s2->ctx_doi) &&
896 (s1->ctx_alg == s2->ctx_alg)));
897}
898#else
899static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
900{
901 return true;
902}
903#endif
904
905/* A struct encoding bundle of transformations to apply to some set of flow.
906 *
907 * xdst->child points to the next element of bundle.
908 * dst->xfrm points to an instanse of transformer.
909 *
910 * Due to unfortunate limitations of current routing cache, which we
911 * have no time to fix, it mirrors struct rtable and bound to the same
912 * routing key, including saddr,daddr. However, we can have many of
913 * bundles differing by session id. All the bundles grow from a parent
914 * policy rule.
915 */
916struct xfrm_dst {
917 union {
918 struct dst_entry dst;
919 struct rtable rt;
920 struct rt6_info rt6;
921 } u;
922 struct dst_entry *route;
923 struct dst_entry *child;
924 struct dst_entry *path;
925 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
926 int num_pols, num_xfrms;
927 u32 xfrm_genid;
928 u32 policy_genid;
929 u32 route_mtu_cached;
930 u32 child_mtu_cached;
931 u32 route_cookie;
932 u32 path_cookie;
933};
934
935static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
936{
937#ifdef CONFIG_XFRM
938 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
939 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
940
941 return xdst->path;
942 }
943#endif
944 return (struct dst_entry *) dst;
945}
946
947static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
948{
949#ifdef CONFIG_XFRM
950 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
951 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
952 return xdst->child;
953 }
954#endif
955 return NULL;
956}
957
958#ifdef CONFIG_XFRM
959static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
960{
961 xdst->child = child;
962}
963
964static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
965{
966 xfrm_pols_put(xdst->pols, xdst->num_pols);
967 dst_release(xdst->route);
968 if (likely(xdst->u.dst.xfrm))
969 xfrm_state_put(xdst->u.dst.xfrm);
970}
971#endif
972
973void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
974
975struct xfrm_if_parms {
976 int link; /* ifindex of underlying L2 interface */
977 u32 if_id; /* interface identifyer */
978};
979
980struct xfrm_if {
981 struct xfrm_if __rcu *next; /* next interface in list */
982 struct net_device *dev; /* virtual device associated with interface */
983 struct net *net; /* netns for packet i/o */
984 struct xfrm_if_parms p; /* interface parms */
985
986 struct gro_cells gro_cells;
987};
988
989struct xfrm_offload {
990 /* Output sequence number for replay protection on offloading. */
991 struct {
992 __u32 low;
993 __u32 hi;
994 } seq;
995
996 __u32 flags;
997#define SA_DELETE_REQ 1
998#define CRYPTO_DONE 2
999#define CRYPTO_NEXT_DONE 4
1000#define CRYPTO_FALLBACK 8
1001#define XFRM_GSO_SEGMENT 16
1002#define XFRM_GRO 32
1003#define XFRM_ESP_NO_TRAILER 64
1004#define XFRM_DEV_RESUME 128
1005#define XFRM_XMIT 256
1006
1007 __u32 status;
1008#define CRYPTO_SUCCESS 1
1009#define CRYPTO_GENERIC_ERROR 2
1010#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1011#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1012#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1013#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1014#define CRYPTO_INVALID_PACKET_SYNTAX 64
1015#define CRYPTO_INVALID_PROTOCOL 128
1016
1017 __u8 proto;
1018 __u8 inner_ipproto;
1019};
1020
1021struct sec_path {
1022 int len;
1023 int olen;
1024
1025 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1026 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1027};
1028
1029struct sec_path *secpath_set(struct sk_buff *skb);
1030
1031static inline void
1032secpath_reset(struct sk_buff *skb)
1033{
1034#ifdef CONFIG_XFRM
1035 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1036#endif
1037}
1038
1039static inline int
1040xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1041{
1042 switch (family) {
1043 case AF_INET:
1044 return addr->a4 == 0;
1045 case AF_INET6:
1046 return ipv6_addr_any(&addr->in6);
1047 }
1048 return 0;
1049}
1050
1051static inline int
1052__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1053{
1054 return (tmpl->saddr.a4 &&
1055 tmpl->saddr.a4 != x->props.saddr.a4);
1056}
1057
1058static inline int
1059__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1060{
1061 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1062 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1063}
1064
1065static inline int
1066xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1067{
1068 switch (family) {
1069 case AF_INET:
1070 return __xfrm4_state_addr_cmp(tmpl, x);
1071 case AF_INET6:
1072 return __xfrm6_state_addr_cmp(tmpl, x);
1073 }
1074 return !0;
1075}
1076
1077#ifdef CONFIG_XFRM
1078int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1079 unsigned short family);
1080
1081static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1082 struct sk_buff *skb,
1083 unsigned int family, int reverse)
1084{
1085 struct net *net = dev_net(skb->dev);
1086 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1087
1088 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1089 return __xfrm_policy_check(sk, ndir, skb, family);
1090
1091 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1092 (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) ||
1093 __xfrm_policy_check(sk, ndir, skb, family);
1094}
1095
1096static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1097{
1098 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1099}
1100
1101static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1102{
1103 return xfrm_policy_check(sk, dir, skb, AF_INET);
1104}
1105
1106static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1107{
1108 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1109}
1110
1111static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1112 struct sk_buff *skb)
1113{
1114 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1115}
1116
1117static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1118 struct sk_buff *skb)
1119{
1120 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1121}
1122
1123int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1124 unsigned int family, int reverse);
1125
1126static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1127 unsigned int family)
1128{
1129 return __xfrm_decode_session(skb, fl, family, 0);
1130}
1131
1132static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1133 struct flowi *fl,
1134 unsigned int family)
1135{
1136 return __xfrm_decode_session(skb, fl, family, 1);
1137}
1138
1139int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1140
1141static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1142{
1143 struct net *net = dev_net(skb->dev);
1144
1145 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1146 (skb_dst(skb)->flags & DST_NOXFRM) ||
1147 __xfrm_route_forward(skb, family);
1148}
1149
1150static inline int xfrm4_route_forward(struct sk_buff *skb)
1151{
1152 return xfrm_route_forward(skb, AF_INET);
1153}
1154
1155static inline int xfrm6_route_forward(struct sk_buff *skb)
1156{
1157 return xfrm_route_forward(skb, AF_INET6);
1158}
1159
1160int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1161
1162static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1163{
1164 sk->sk_policy[0] = NULL;
1165 sk->sk_policy[1] = NULL;
1166 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1167 return __xfrm_sk_clone_policy(sk, osk);
1168 return 0;
1169}
1170
1171int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1172
1173static inline void xfrm_sk_free_policy(struct sock *sk)
1174{
1175 struct xfrm_policy *pol;
1176
1177 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1178 if (unlikely(pol != NULL)) {
1179 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1180 sk->sk_policy[0] = NULL;
1181 }
1182 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1183 if (unlikely(pol != NULL)) {
1184 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1185 sk->sk_policy[1] = NULL;
1186 }
1187}
1188
1189#else
1190
1191static inline void xfrm_sk_free_policy(struct sock *sk) {}
1192static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1193static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1194static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1195static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1196{
1197 return 1;
1198}
1199static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1200{
1201 return 1;
1202}
1203static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1204{
1205 return 1;
1206}
1207static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1208 struct flowi *fl,
1209 unsigned int family)
1210{
1211 return -ENOSYS;
1212}
1213static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1214 struct sk_buff *skb)
1215{
1216 return 1;
1217}
1218static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1219 struct sk_buff *skb)
1220{
1221 return 1;
1222}
1223#endif
1224
1225static __inline__
1226xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1227{
1228 switch (family){
1229 case AF_INET:
1230 return (xfrm_address_t *)&fl->u.ip4.daddr;
1231 case AF_INET6:
1232 return (xfrm_address_t *)&fl->u.ip6.daddr;
1233 }
1234 return NULL;
1235}
1236
1237static __inline__
1238xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1239{
1240 switch (family){
1241 case AF_INET:
1242 return (xfrm_address_t *)&fl->u.ip4.saddr;
1243 case AF_INET6:
1244 return (xfrm_address_t *)&fl->u.ip6.saddr;
1245 }
1246 return NULL;
1247}
1248
1249static __inline__
1250void xfrm_flowi_addr_get(const struct flowi *fl,
1251 xfrm_address_t *saddr, xfrm_address_t *daddr,
1252 unsigned short family)
1253{
1254 switch(family) {
1255 case AF_INET:
1256 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1257 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1258 break;
1259 case AF_INET6:
1260 saddr->in6 = fl->u.ip6.saddr;
1261 daddr->in6 = fl->u.ip6.daddr;
1262 break;
1263 }
1264}
1265
1266static __inline__ int
1267__xfrm4_state_addr_check(const struct xfrm_state *x,
1268 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1269{
1270 if (daddr->a4 == x->id.daddr.a4 &&
1271 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1272 return 1;
1273 return 0;
1274}
1275
1276static __inline__ int
1277__xfrm6_state_addr_check(const struct xfrm_state *x,
1278 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1279{
1280 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1281 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1282 ipv6_addr_any((struct in6_addr *)saddr) ||
1283 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1284 return 1;
1285 return 0;
1286}
1287
1288static __inline__ int
1289xfrm_state_addr_check(const struct xfrm_state *x,
1290 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1291 unsigned short family)
1292{
1293 switch (family) {
1294 case AF_INET:
1295 return __xfrm4_state_addr_check(x, daddr, saddr);
1296 case AF_INET6:
1297 return __xfrm6_state_addr_check(x, daddr, saddr);
1298 }
1299 return 0;
1300}
1301
1302static __inline__ int
1303xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1304 unsigned short family)
1305{
1306 switch (family) {
1307 case AF_INET:
1308 return __xfrm4_state_addr_check(x,
1309 (const xfrm_address_t *)&fl->u.ip4.daddr,
1310 (const xfrm_address_t *)&fl->u.ip4.saddr);
1311 case AF_INET6:
1312 return __xfrm6_state_addr_check(x,
1313 (const xfrm_address_t *)&fl->u.ip6.daddr,
1314 (const xfrm_address_t *)&fl->u.ip6.saddr);
1315 }
1316 return 0;
1317}
1318
1319static inline int xfrm_state_kern(const struct xfrm_state *x)
1320{
1321 return atomic_read(&x->tunnel_users);
1322}
1323
1324static inline bool xfrm_id_proto_valid(u8 proto)
1325{
1326 switch (proto) {
1327 case IPPROTO_AH:
1328 case IPPROTO_ESP:
1329 case IPPROTO_COMP:
1330#if IS_ENABLED(CONFIG_IPV6)
1331 case IPPROTO_ROUTING:
1332 case IPPROTO_DSTOPTS:
1333#endif
1334 return true;
1335 default:
1336 return false;
1337 }
1338}
1339
1340/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1341static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1342{
1343 return (!userproto || proto == userproto ||
1344 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1345 proto == IPPROTO_ESP ||
1346 proto == IPPROTO_COMP)));
1347}
1348
1349/*
1350 * xfrm algorithm information
1351 */
1352struct xfrm_algo_aead_info {
1353 char *geniv;
1354 u16 icv_truncbits;
1355};
1356
1357struct xfrm_algo_auth_info {
1358 u16 icv_truncbits;
1359 u16 icv_fullbits;
1360};
1361
1362struct xfrm_algo_encr_info {
1363 char *geniv;
1364 u16 blockbits;
1365 u16 defkeybits;
1366};
1367
1368struct xfrm_algo_comp_info {
1369 u16 threshold;
1370};
1371
1372struct xfrm_algo_desc {
1373 char *name;
1374 char *compat;
1375 u8 available:1;
1376 u8 pfkey_supported:1;
1377 union {
1378 struct xfrm_algo_aead_info aead;
1379 struct xfrm_algo_auth_info auth;
1380 struct xfrm_algo_encr_info encr;
1381 struct xfrm_algo_comp_info comp;
1382 } uinfo;
1383 struct sadb_alg desc;
1384};
1385
1386/* XFRM protocol handlers. */
1387struct xfrm4_protocol {
1388 int (*handler)(struct sk_buff *skb);
1389 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1390 int encap_type);
1391 int (*cb_handler)(struct sk_buff *skb, int err);
1392 int (*err_handler)(struct sk_buff *skb, u32 info);
1393
1394 struct xfrm4_protocol __rcu *next;
1395 int priority;
1396};
1397
1398struct xfrm6_protocol {
1399 int (*handler)(struct sk_buff *skb);
1400 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1401 int encap_type);
1402 int (*cb_handler)(struct sk_buff *skb, int err);
1403 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1404 u8 type, u8 code, int offset, __be32 info);
1405
1406 struct xfrm6_protocol __rcu *next;
1407 int priority;
1408};
1409
1410/* XFRM tunnel handlers. */
1411struct xfrm_tunnel {
1412 int (*handler)(struct sk_buff *skb);
1413 int (*cb_handler)(struct sk_buff *skb, int err);
1414 int (*err_handler)(struct sk_buff *skb, u32 info);
1415
1416 struct xfrm_tunnel __rcu *next;
1417 int priority;
1418};
1419
1420struct xfrm6_tunnel {
1421 int (*handler)(struct sk_buff *skb);
1422 int (*cb_handler)(struct sk_buff *skb, int err);
1423 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1424 u8 type, u8 code, int offset, __be32 info);
1425 struct xfrm6_tunnel __rcu *next;
1426 int priority;
1427};
1428
1429void xfrm_init(void);
1430void xfrm4_init(void);
1431int xfrm_state_init(struct net *net);
1432void xfrm_state_fini(struct net *net);
1433void xfrm4_state_init(void);
1434void xfrm4_protocol_init(void);
1435#ifdef CONFIG_XFRM
1436int xfrm6_init(void);
1437void xfrm6_fini(void);
1438int xfrm6_state_init(void);
1439void xfrm6_state_fini(void);
1440int xfrm6_protocol_init(void);
1441void xfrm6_protocol_fini(void);
1442#else
1443static inline int xfrm6_init(void)
1444{
1445 return 0;
1446}
1447static inline void xfrm6_fini(void)
1448{
1449 ;
1450}
1451#endif
1452
1453#ifdef CONFIG_XFRM_STATISTICS
1454int xfrm_proc_init(struct net *net);
1455void xfrm_proc_fini(struct net *net);
1456#endif
1457
1458int xfrm_sysctl_init(struct net *net);
1459#ifdef CONFIG_SYSCTL
1460void xfrm_sysctl_fini(struct net *net);
1461#else
1462static inline void xfrm_sysctl_fini(struct net *net)
1463{
1464}
1465#endif
1466
1467void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1468 struct xfrm_address_filter *filter);
1469int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1470 int (*func)(struct xfrm_state *, int, void*), void *);
1471void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1472struct xfrm_state *xfrm_state_alloc(struct net *net);
1473void xfrm_state_free(struct xfrm_state *x);
1474struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1475 const xfrm_address_t *saddr,
1476 const struct flowi *fl,
1477 struct xfrm_tmpl *tmpl,
1478 struct xfrm_policy *pol, int *err,
1479 unsigned short family, u32 if_id);
1480struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1481 xfrm_address_t *daddr,
1482 xfrm_address_t *saddr,
1483 unsigned short family,
1484 u8 mode, u8 proto, u32 reqid);
1485struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1486 unsigned short family);
1487int xfrm_state_check_expire(struct xfrm_state *x);
1488void xfrm_state_insert(struct xfrm_state *x);
1489int xfrm_state_add(struct xfrm_state *x);
1490int xfrm_state_update(struct xfrm_state *x);
1491struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1492 const xfrm_address_t *daddr, __be32 spi,
1493 u8 proto, unsigned short family);
1494struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1495 const xfrm_address_t *daddr,
1496 const xfrm_address_t *saddr,
1497 u8 proto,
1498 unsigned short family);
1499#ifdef CONFIG_XFRM_SUB_POLICY
1500void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1501 unsigned short family);
1502void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1503 unsigned short family);
1504#else
1505static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1506 int n, unsigned short family)
1507{
1508}
1509
1510static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1511 int n, unsigned short family)
1512{
1513}
1514#endif
1515
1516struct xfrmk_sadinfo {
1517 u32 sadhcnt; /* current hash bkts */
1518 u32 sadhmcnt; /* max allowed hash bkts */
1519 u32 sadcnt; /* current running count */
1520};
1521
1522struct xfrmk_spdinfo {
1523 u32 incnt;
1524 u32 outcnt;
1525 u32 fwdcnt;
1526 u32 inscnt;
1527 u32 outscnt;
1528 u32 fwdscnt;
1529 u32 spdhcnt;
1530 u32 spdhmcnt;
1531};
1532
1533struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1534int xfrm_state_delete(struct xfrm_state *x);
1535int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1536int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1537void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1538void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1539u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1540int xfrm_init_replay(struct xfrm_state *x);
1541u32 __xfrm_state_mtu(struct xfrm_state *x, int mtu);
1542u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1543int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1544int xfrm_init_state(struct xfrm_state *x);
1545int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1546int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1547int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1548 int (*finish)(struct net *, struct sock *,
1549 struct sk_buff *));
1550int xfrm_trans_queue(struct sk_buff *skb,
1551 int (*finish)(struct net *, struct sock *,
1552 struct sk_buff *));
1553int xfrm_output_resume(struct sock *sk, 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_input(struct xfrm_state *x, struct sk_buff *skb);
1562int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1563 int encap_type);
1564int xfrm4_transport_finish(struct sk_buff *skb, int async);
1565int xfrm4_rcv(struct sk_buff *skb);
1566
1567static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1568{
1569 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1570 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1571 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1572 return xfrm_input(skb, nexthdr, spi, 0);
1573}
1574
1575int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1576int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1577int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1578int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1579int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1580void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1581int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1582int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1583 struct ip6_tnl *t);
1584int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1585 int encap_type);
1586int xfrm6_transport_finish(struct sk_buff *skb, int async);
1587int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1588int xfrm6_rcv(struct sk_buff *skb);
1589int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1590 xfrm_address_t *saddr, u8 proto);
1591void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1592int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1593int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1594int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1595int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1596__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1597__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1598int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1599
1600#ifdef CONFIG_XFRM
1601void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1602int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1603int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1604int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1605 int optlen);
1606#else
1607static inline int xfrm_user_policy(struct sock *sk, int optname,
1608 sockptr_t optval, int optlen)
1609{
1610 return -ENOPROTOOPT;
1611}
1612#endif
1613
1614struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1615 const xfrm_address_t *saddr,
1616 const xfrm_address_t *daddr,
1617 int family, u32 mark);
1618
1619struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1620
1621void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1622int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1623 int (*func)(struct xfrm_policy *, int, int, void*),
1624 void *);
1625void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1626int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1627struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1628 const struct xfrm_mark *mark,
1629 u32 if_id, u8 type, int dir,
1630 struct xfrm_selector *sel,
1631 struct xfrm_sec_ctx *ctx, int delete,
1632 int *err);
1633struct xfrm_policy *xfrm_policy_byid(struct net *net,
1634 const struct xfrm_mark *mark, u32 if_id,
1635 u8 type, int dir, u32 id, int delete,
1636 int *err);
1637int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1638void xfrm_policy_hash_rebuild(struct net *net);
1639u32 xfrm_get_acqseq(void);
1640int verify_spi_info(u8 proto, u32 min, u32 max);
1641int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1642struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1643 u8 mode, u32 reqid, u32 if_id, u8 proto,
1644 const xfrm_address_t *daddr,
1645 const xfrm_address_t *saddr, int create,
1646 unsigned short family);
1647int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1648
1649#ifdef CONFIG_XFRM_MIGRATE
1650int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1651 const struct xfrm_migrate *m, int num_bundles,
1652 const struct xfrm_kmaddress *k,
1653 const struct xfrm_encap_tmpl *encap);
1654struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1655struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1656 struct xfrm_migrate *m,
1657 struct xfrm_encap_tmpl *encap);
1658int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1659 struct xfrm_migrate *m, int num_bundles,
1660 struct xfrm_kmaddress *k, struct net *net,
1661 struct xfrm_encap_tmpl *encap);
1662#endif
1663
1664int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1665void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1666int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1667 xfrm_address_t *addr);
1668
1669void xfrm_input_init(void);
1670int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1671
1672void xfrm_probe_algs(void);
1673int xfrm_count_pfkey_auth_supported(void);
1674int xfrm_count_pfkey_enc_supported(void);
1675struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1676struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1677struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1678struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1679struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1680struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1681struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1682struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1683struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1684 int probe);
1685
1686static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1687 const xfrm_address_t *b)
1688{
1689 return ipv6_addr_equal((const struct in6_addr *)a,
1690 (const struct in6_addr *)b);
1691}
1692
1693static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1694 const xfrm_address_t *b,
1695 sa_family_t family)
1696{
1697 switch (family) {
1698 default:
1699 case AF_INET:
1700 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1701 case AF_INET6:
1702 return xfrm6_addr_equal(a, b);
1703 }
1704}
1705
1706static inline int xfrm_policy_id2dir(u32 index)
1707{
1708 return index & 7;
1709}
1710
1711#ifdef CONFIG_XFRM
1712void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1713int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1714void xfrm_replay_notify(struct xfrm_state *x, int event);
1715int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1716int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1717
1718static inline int xfrm_aevent_is_on(struct net *net)
1719{
1720 struct sock *nlsk;
1721 int ret = 0;
1722
1723 rcu_read_lock();
1724 nlsk = rcu_dereference(net->xfrm.nlsk);
1725 if (nlsk)
1726 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1727 rcu_read_unlock();
1728 return ret;
1729}
1730
1731static inline int xfrm_acquire_is_on(struct net *net)
1732{
1733 struct sock *nlsk;
1734 int ret = 0;
1735
1736 rcu_read_lock();
1737 nlsk = rcu_dereference(net->xfrm.nlsk);
1738 if (nlsk)
1739 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1740 rcu_read_unlock();
1741
1742 return ret;
1743}
1744#endif
1745
1746static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1747{
1748 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1749}
1750
1751static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1752{
1753 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1754}
1755
1756static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1757{
1758 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1759}
1760
1761static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1762{
1763 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1764}
1765
1766#ifdef CONFIG_XFRM_MIGRATE
1767static inline int xfrm_replay_clone(struct xfrm_state *x,
1768 struct xfrm_state *orig)
1769{
1770
1771 x->replay_esn = kmemdup(orig->replay_esn,
1772 xfrm_replay_state_esn_len(orig->replay_esn),
1773 GFP_KERNEL);
1774 if (!x->replay_esn)
1775 return -ENOMEM;
1776 x->preplay_esn = kmemdup(orig->preplay_esn,
1777 xfrm_replay_state_esn_len(orig->preplay_esn),
1778 GFP_KERNEL);
1779 if (!x->preplay_esn)
1780 return -ENOMEM;
1781
1782 return 0;
1783}
1784
1785static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1786{
1787 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1788}
1789
1790
1791static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1792{
1793 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1794}
1795
1796static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1797{
1798 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1799}
1800
1801static inline void xfrm_states_put(struct xfrm_state **states, int n)
1802{
1803 int i;
1804 for (i = 0; i < n; i++)
1805 xfrm_state_put(*(states + i));
1806}
1807
1808static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1809{
1810 int i;
1811 for (i = 0; i < n; i++)
1812 xfrm_state_delete(*(states + i));
1813}
1814#endif
1815
1816#ifdef CONFIG_XFRM
1817static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1818{
1819 struct sec_path *sp = skb_sec_path(skb);
1820
1821 return sp->xvec[sp->len - 1];
1822}
1823#endif
1824
1825static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1826{
1827#ifdef CONFIG_XFRM
1828 struct sec_path *sp = skb_sec_path(skb);
1829
1830 if (!sp || !sp->olen || sp->len != sp->olen)
1831 return NULL;
1832
1833 return &sp->ovec[sp->olen - 1];
1834#else
1835 return NULL;
1836#endif
1837}
1838
1839void __init xfrm_dev_init(void);
1840
1841#ifdef CONFIG_XFRM_OFFLOAD
1842void xfrm_dev_resume(struct sk_buff *skb);
1843void xfrm_dev_backlog(struct softnet_data *sd);
1844struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1845int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1846 struct xfrm_user_offload *xuo);
1847bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1848
1849static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1850{
1851 struct xfrm_state_offload *xso = &x->xso;
1852
1853 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1854 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1855}
1856
1857static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1858{
1859 struct xfrm_state *x = dst->xfrm;
1860 struct xfrm_dst *xdst;
1861
1862 if (!x || !x->type_offload)
1863 return false;
1864
1865 xdst = (struct xfrm_dst *) dst;
1866 if (!x->xso.offload_handle && !xdst->child->xfrm)
1867 return true;
1868 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1869 !xdst->child->xfrm)
1870 return true;
1871
1872 return false;
1873}
1874
1875static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1876{
1877 struct xfrm_state_offload *xso = &x->xso;
1878
1879 if (xso->dev)
1880 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1881}
1882
1883static inline void xfrm_dev_state_free(struct xfrm_state *x)
1884{
1885 struct xfrm_state_offload *xso = &x->xso;
1886 struct net_device *dev = xso->dev;
1887
1888 if (dev && dev->xfrmdev_ops) {
1889 if (dev->xfrmdev_ops->xdo_dev_state_free)
1890 dev->xfrmdev_ops->xdo_dev_state_free(x);
1891 xso->dev = NULL;
1892 dev_put(dev);
1893 }
1894}
1895#else
1896static inline void xfrm_dev_resume(struct sk_buff *skb)
1897{
1898}
1899
1900static inline void xfrm_dev_backlog(struct softnet_data *sd)
1901{
1902}
1903
1904static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1905{
1906 return skb;
1907}
1908
1909static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1910{
1911 return 0;
1912}
1913
1914static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1915{
1916}
1917
1918static inline void xfrm_dev_state_free(struct xfrm_state *x)
1919{
1920}
1921
1922static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1923{
1924 return false;
1925}
1926
1927static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1928{
1929}
1930
1931static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1932{
1933 return false;
1934}
1935#endif
1936
1937static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1938{
1939 if (attrs[XFRMA_MARK])
1940 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1941 else
1942 m->v = m->m = 0;
1943
1944 return m->v & m->m;
1945}
1946
1947static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1948{
1949 int ret = 0;
1950
1951 if (m->m | m->v)
1952 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1953 return ret;
1954}
1955
1956static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1957{
1958 struct xfrm_mark *m = &x->props.smark;
1959
1960 return (m->v & m->m) | (mark & ~m->m);
1961}
1962
1963static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1964{
1965 int ret = 0;
1966
1967 if (if_id)
1968 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1969 return ret;
1970}
1971
1972static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1973 unsigned int family)
1974{
1975 bool tunnel = false;
1976
1977 switch(family) {
1978 case AF_INET:
1979 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1980 tunnel = true;
1981 break;
1982 case AF_INET6:
1983 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1984 tunnel = true;
1985 break;
1986 }
1987 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1988 return -EINVAL;
1989
1990 return 0;
1991}
1992
1993extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
1994extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1995
1996struct xfrm_translator {
1997 /* Allocate frag_list and put compat translation there */
1998 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
1999
2000 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2001 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2002 int maxtype, const struct nla_policy *policy,
2003 struct netlink_ext_ack *extack);
2004
2005 /* Translate 32-bit user_policy from sockptr */
2006 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2007
2008 struct module *owner;
2009};
2010
2011#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2012extern int xfrm_register_translator(struct xfrm_translator *xtr);
2013extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2014extern struct xfrm_translator *xfrm_get_translator(void);
2015extern void xfrm_put_translator(struct xfrm_translator *xtr);
2016#else
2017static inline struct xfrm_translator *xfrm_get_translator(void)
2018{
2019 return NULL;
2020}
2021static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2022{
2023}
2024#endif
2025
2026#if IS_ENABLED(CONFIG_IPV6)
2027static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2028{
2029 int proto;
2030
2031 if (!sk || sk->sk_family != AF_INET6)
2032 return false;
2033
2034 proto = sk->sk_protocol;
2035 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2036 return inet6_sk(sk)->dontfrag;
2037
2038 return false;
2039}
2040#endif
2041#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#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 */