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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#define XFRM_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.xfrm_statistics, field, val)
55#else
56#define XFRM_INC_STATS(net, field) ((void)(net))
57#define XFRM_ADD_STATS(net, field, val) ((void)(net))
58#endif
59
60
61/* Organization of SPD aka "XFRM rules"
62 ------------------------------------
63
64 Basic objects:
65 - policy rule, struct xfrm_policy (=SPD entry)
66 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
67 - instance of a transformer, struct xfrm_state (=SA)
68 - template to clone xfrm_state, struct xfrm_tmpl
69
70 SPD is plain linear list of xfrm_policy rules, ordered by priority.
71 (To be compatible with existing pfkeyv2 implementations,
72 many rules with priority of 0x7fffffff are allowed to exist and
73 such rules are ordered in an unpredictable way, thanks to bsd folks.)
74
75 Lookup is plain linear search until the first match with selector.
76
77 If "action" is "block", then we prohibit the flow, otherwise:
78 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
79 policy entry has list of up to XFRM_MAX_DEPTH transformations,
80 described by templates xfrm_tmpl. Each template is resolved
81 to a complete xfrm_state (see below) and we pack bundle of transformations
82 to a dst_entry returned to requestor.
83
84 dst -. xfrm .-> xfrm_state #1
85 |---. child .-> dst -. xfrm .-> xfrm_state #2
86 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 |---. child .-> NULL
88
89 Bundles are cached at xrfm_policy struct (field ->bundles).
90
91
92 Resolution of xrfm_tmpl
93 -----------------------
94 Template contains:
95 1. ->mode Mode: transport or tunnel
96 2. ->id.proto Protocol: AH/ESP/IPCOMP
97 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
98 Q: allow to resolve security gateway?
99 4. ->id.spi If not zero, static SPI.
100 5. ->saddr Local tunnel endpoint, ignored for transport mode.
101 6. ->algos List of allowed algos. Plain bitmask now.
102 Q: ealgos, aalgos, calgos. What a mess...
103 7. ->share Sharing mode.
104 Q: how to implement private sharing mode? To add struct sock* to
105 flow id?
106
107 Having this template we search through SAD searching for entries
108 with appropriate mode/proto/algo, permitted by selector.
109 If no appropriate entry found, it is requested from key manager.
110
111 PROBLEMS:
112 Q: How to find all the bundles referring to a physical path for
113 PMTU discovery? Seems, dst should contain list of all parents...
114 and enter to infinite locking hierarchy disaster.
115 No! It is easier, we will not search for them, let them find us.
116 We add genid to each dst plus pointer to genid of raw IP route,
117 pmtu disc will update pmtu on raw IP route and increase its genid.
118 dst_check() will see this for top level and trigger resyncing
119 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 */
121
122struct xfrm_state_walk {
123 struct list_head all;
124 u8 state;
125 u8 dying;
126 u8 proto;
127 u32 seq;
128 struct xfrm_address_filter *filter;
129};
130
131enum {
132 XFRM_DEV_OFFLOAD_IN = 1,
133 XFRM_DEV_OFFLOAD_OUT,
134 XFRM_DEV_OFFLOAD_FWD,
135};
136
137enum {
138 XFRM_DEV_OFFLOAD_UNSPECIFIED,
139 XFRM_DEV_OFFLOAD_CRYPTO,
140 XFRM_DEV_OFFLOAD_PACKET,
141};
142
143enum {
144 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
145};
146
147struct xfrm_dev_offload {
148 struct net_device *dev;
149 netdevice_tracker dev_tracker;
150 struct net_device *real_dev;
151 unsigned long offload_handle;
152 u8 dir : 2;
153 u8 type : 2;
154 u8 flags : 2;
155};
156
157struct xfrm_mode {
158 u8 encap;
159 u8 family;
160 u8 flags;
161};
162
163/* Flags for xfrm_mode. */
164enum {
165 XFRM_MODE_FLAG_TUNNEL = 1,
166};
167
168enum xfrm_replay_mode {
169 XFRM_REPLAY_MODE_LEGACY,
170 XFRM_REPLAY_MODE_BMP,
171 XFRM_REPLAY_MODE_ESN,
172};
173
174/* Full description of state of transformer. */
175struct xfrm_state {
176 possible_net_t xs_net;
177 union {
178 struct hlist_node gclist;
179 struct hlist_node bydst;
180 };
181 struct hlist_node bysrc;
182 struct hlist_node byspi;
183 struct hlist_node byseq;
184
185 refcount_t refcnt;
186 spinlock_t lock;
187
188 struct xfrm_id id;
189 struct xfrm_selector sel;
190 struct xfrm_mark mark;
191 u32 if_id;
192 u32 tfcpad;
193
194 u32 genid;
195
196 /* Key manager bits */
197 struct xfrm_state_walk km;
198
199 /* Parameters of this state. */
200 struct {
201 u32 reqid;
202 u8 mode;
203 u8 replay_window;
204 u8 aalgo, ealgo, calgo;
205 u8 flags;
206 u16 family;
207 xfrm_address_t saddr;
208 int header_len;
209 int trailer_len;
210 u32 extra_flags;
211 struct xfrm_mark smark;
212 } props;
213
214 struct xfrm_lifetime_cfg lft;
215
216 /* Data for transformer */
217 struct xfrm_algo_auth *aalg;
218 struct xfrm_algo *ealg;
219 struct xfrm_algo *calg;
220 struct xfrm_algo_aead *aead;
221 const char *geniv;
222
223 /* mapping change rate limiting */
224 __be16 new_mapping_sport;
225 u32 new_mapping; /* seconds */
226 u32 mapping_maxage; /* seconds for input SA */
227
228 /* Data for encapsulator */
229 struct xfrm_encap_tmpl *encap;
230 struct sock __rcu *encap_sk;
231
232 /* Data for care-of address */
233 xfrm_address_t *coaddr;
234
235 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
236 struct xfrm_state *tunnel;
237
238 /* If a tunnel, number of users + 1 */
239 atomic_t tunnel_users;
240
241 /* State for replay detection */
242 struct xfrm_replay_state replay;
243 struct xfrm_replay_state_esn *replay_esn;
244
245 /* Replay detection state at the time we sent the last notification */
246 struct xfrm_replay_state preplay;
247 struct xfrm_replay_state_esn *preplay_esn;
248
249 /* replay detection mode */
250 enum xfrm_replay_mode repl_mode;
251 /* internal flag that only holds state for delayed aevent at the
252 * moment
253 */
254 u32 xflags;
255
256 /* Replay detection notification settings */
257 u32 replay_maxage;
258 u32 replay_maxdiff;
259
260 /* Replay detection notification timer */
261 struct timer_list rtimer;
262
263 /* Statistics */
264 struct xfrm_stats stats;
265
266 struct xfrm_lifetime_cur curlft;
267 struct hrtimer mtimer;
268
269 struct xfrm_dev_offload xso;
270
271 /* used to fix curlft->add_time when changing date */
272 long saved_tmo;
273
274 /* Last used time */
275 time64_t lastused;
276
277 struct page_frag xfrag;
278
279 /* Reference to data common to all the instances of this
280 * transformer. */
281 const struct xfrm_type *type;
282 struct xfrm_mode inner_mode;
283 struct xfrm_mode inner_mode_iaf;
284 struct xfrm_mode outer_mode;
285
286 const struct xfrm_type_offload *type_offload;
287
288 /* Security context */
289 struct xfrm_sec_ctx *security;
290
291 /* Private data of this transformer, format is opaque,
292 * interpreted by xfrm_type methods. */
293 void *data;
294};
295
296static inline struct net *xs_net(struct xfrm_state *x)
297{
298 return read_pnet(&x->xs_net);
299}
300
301/* xflags - make enum if more show up */
302#define XFRM_TIME_DEFER 1
303#define XFRM_SOFT_EXPIRE 2
304
305enum {
306 XFRM_STATE_VOID,
307 XFRM_STATE_ACQ,
308 XFRM_STATE_VALID,
309 XFRM_STATE_ERROR,
310 XFRM_STATE_EXPIRED,
311 XFRM_STATE_DEAD
312};
313
314/* callback structure passed from either netlink or pfkey */
315struct km_event {
316 union {
317 u32 hard;
318 u32 proto;
319 u32 byid;
320 u32 aevent;
321 u32 type;
322 } data;
323
324 u32 seq;
325 u32 portid;
326 u32 event;
327 struct net *net;
328};
329
330struct xfrm_if_decode_session_result {
331 struct net *net;
332 u32 if_id;
333};
334
335struct xfrm_if_cb {
336 bool (*decode_session)(struct sk_buff *skb,
337 unsigned short family,
338 struct xfrm_if_decode_session_result *res);
339};
340
341void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
342void xfrm_if_unregister_cb(void);
343
344struct net_device;
345struct xfrm_type;
346struct xfrm_dst;
347struct xfrm_policy_afinfo {
348 struct dst_ops *dst_ops;
349 struct dst_entry *(*dst_lookup)(struct net *net,
350 int tos, int oif,
351 const xfrm_address_t *saddr,
352 const xfrm_address_t *daddr,
353 u32 mark);
354 int (*get_saddr)(struct net *net, int oif,
355 xfrm_address_t *saddr,
356 xfrm_address_t *daddr,
357 u32 mark);
358 int (*fill_dst)(struct xfrm_dst *xdst,
359 struct net_device *dev,
360 const struct flowi *fl);
361 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
362};
363
364int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
365void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
366void km_policy_notify(struct xfrm_policy *xp, int dir,
367 const struct km_event *c);
368void km_state_notify(struct xfrm_state *x, const struct km_event *c);
369
370struct xfrm_tmpl;
371int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
372 struct xfrm_policy *pol);
373void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
374int __xfrm_state_delete(struct xfrm_state *x);
375
376struct xfrm_state_afinfo {
377 u8 family;
378 u8 proto;
379
380 const struct xfrm_type_offload *type_offload_esp;
381
382 const struct xfrm_type *type_esp;
383 const struct xfrm_type *type_ipip;
384 const struct xfrm_type *type_ipip6;
385 const struct xfrm_type *type_comp;
386 const struct xfrm_type *type_ah;
387 const struct xfrm_type *type_routing;
388 const struct xfrm_type *type_dstopts;
389
390 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
391 int (*transport_finish)(struct sk_buff *skb,
392 int async);
393 void (*local_error)(struct sk_buff *skb, u32 mtu);
394};
395
396int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
397int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
398struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
399struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
400
401struct xfrm_input_afinfo {
402 u8 family;
403 bool is_ipip;
404 int (*callback)(struct sk_buff *skb, u8 protocol,
405 int err);
406};
407
408int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
409int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
410
411void xfrm_flush_gc(void);
412void xfrm_state_delete_tunnel(struct xfrm_state *x);
413
414struct xfrm_type {
415 struct module *owner;
416 u8 proto;
417 u8 flags;
418#define XFRM_TYPE_NON_FRAGMENT 1
419#define XFRM_TYPE_REPLAY_PROT 2
420#define XFRM_TYPE_LOCAL_COADDR 4
421#define XFRM_TYPE_REMOTE_COADDR 8
422
423 int (*init_state)(struct xfrm_state *x,
424 struct netlink_ext_ack *extack);
425 void (*destructor)(struct xfrm_state *);
426 int (*input)(struct xfrm_state *, struct sk_buff *skb);
427 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
428 int (*reject)(struct xfrm_state *, struct sk_buff *,
429 const struct flowi *);
430};
431
432int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
433void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
434
435struct xfrm_type_offload {
436 struct module *owner;
437 u8 proto;
438 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
439 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
440 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
441};
442
443int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
444void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
445
446static inline int xfrm_af2proto(unsigned int family)
447{
448 switch(family) {
449 case AF_INET:
450 return IPPROTO_IPIP;
451 case AF_INET6:
452 return IPPROTO_IPV6;
453 default:
454 return 0;
455 }
456}
457
458static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
459{
460 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
461 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
462 return &x->inner_mode;
463 else
464 return &x->inner_mode_iaf;
465}
466
467struct xfrm_tmpl {
468/* id in template is interpreted as:
469 * daddr - destination of tunnel, may be zero for transport mode.
470 * spi - zero to acquire spi. Not zero if spi is static, then
471 * daddr must be fixed too.
472 * proto - AH/ESP/IPCOMP
473 */
474 struct xfrm_id id;
475
476/* Source address of tunnel. Ignored, if it is not a tunnel. */
477 xfrm_address_t saddr;
478
479 unsigned short encap_family;
480
481 u32 reqid;
482
483/* Mode: transport, tunnel etc. */
484 u8 mode;
485
486/* Sharing mode: unique, this session only, this user only etc. */
487 u8 share;
488
489/* May skip this transfomration if no SA is found */
490 u8 optional;
491
492/* Skip aalgos/ealgos/calgos checks. */
493 u8 allalgs;
494
495/* Bit mask of algos allowed for acquisition */
496 u32 aalgos;
497 u32 ealgos;
498 u32 calgos;
499};
500
501#define XFRM_MAX_DEPTH 6
502#define XFRM_MAX_OFFLOAD_DEPTH 1
503
504struct xfrm_policy_walk_entry {
505 struct list_head all;
506 u8 dead;
507};
508
509struct xfrm_policy_walk {
510 struct xfrm_policy_walk_entry walk;
511 u8 type;
512 u32 seq;
513};
514
515struct xfrm_policy_queue {
516 struct sk_buff_head hold_queue;
517 struct timer_list hold_timer;
518 unsigned long timeout;
519};
520
521struct xfrm_policy {
522 possible_net_t xp_net;
523 struct hlist_node bydst;
524 struct hlist_node byidx;
525
526 /* This lock only affects elements except for entry. */
527 rwlock_t lock;
528 refcount_t refcnt;
529 u32 pos;
530 struct timer_list timer;
531
532 atomic_t genid;
533 u32 priority;
534 u32 index;
535 u32 if_id;
536 struct xfrm_mark mark;
537 struct xfrm_selector selector;
538 struct xfrm_lifetime_cfg lft;
539 struct xfrm_lifetime_cur curlft;
540 struct xfrm_policy_walk_entry walk;
541 struct xfrm_policy_queue polq;
542 bool bydst_reinsert;
543 u8 type;
544 u8 action;
545 u8 flags;
546 u8 xfrm_nr;
547 u16 family;
548 struct xfrm_sec_ctx *security;
549 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
550 struct hlist_node bydst_inexact_list;
551 struct rcu_head rcu;
552
553 struct xfrm_dev_offload xdo;
554};
555
556static inline struct net *xp_net(const struct xfrm_policy *xp)
557{
558 return read_pnet(&xp->xp_net);
559}
560
561struct xfrm_kmaddress {
562 xfrm_address_t local;
563 xfrm_address_t remote;
564 u32 reserved;
565 u16 family;
566};
567
568struct xfrm_migrate {
569 xfrm_address_t old_daddr;
570 xfrm_address_t old_saddr;
571 xfrm_address_t new_daddr;
572 xfrm_address_t new_saddr;
573 u8 proto;
574 u8 mode;
575 u16 reserved;
576 u32 reqid;
577 u16 old_family;
578 u16 new_family;
579};
580
581#define XFRM_KM_TIMEOUT 30
582/* what happened */
583#define XFRM_REPLAY_UPDATE XFRM_AE_CR
584#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
585
586/* default aevent timeout in units of 100ms */
587#define XFRM_AE_ETIME 10
588/* Async Event timer multiplier */
589#define XFRM_AE_ETH_M 10
590/* default seq threshold size */
591#define XFRM_AE_SEQT_SIZE 2
592
593struct xfrm_mgr {
594 struct list_head list;
595 int (*notify)(struct xfrm_state *x, const struct km_event *c);
596 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
597 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
598 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
599 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
600 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
601 int (*migrate)(const struct xfrm_selector *sel,
602 u8 dir, u8 type,
603 const struct xfrm_migrate *m,
604 int num_bundles,
605 const struct xfrm_kmaddress *k,
606 const struct xfrm_encap_tmpl *encap);
607 bool (*is_alive)(const struct km_event *c);
608};
609
610void xfrm_register_km(struct xfrm_mgr *km);
611void xfrm_unregister_km(struct xfrm_mgr *km);
612
613struct xfrm_tunnel_skb_cb {
614 union {
615 struct inet_skb_parm h4;
616 struct inet6_skb_parm h6;
617 } header;
618
619 union {
620 struct ip_tunnel *ip4;
621 struct ip6_tnl *ip6;
622 } tunnel;
623};
624
625#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
626
627/*
628 * This structure is used for the duration where packets are being
629 * transformed by IPsec. As soon as the packet leaves IPsec the
630 * area beyond the generic IP part may be overwritten.
631 */
632struct xfrm_skb_cb {
633 struct xfrm_tunnel_skb_cb header;
634
635 /* Sequence number for replay protection. */
636 union {
637 struct {
638 __u32 low;
639 __u32 hi;
640 } output;
641 struct {
642 __be32 low;
643 __be32 hi;
644 } input;
645 } seq;
646};
647
648#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
649
650/*
651 * This structure is used by the afinfo prepare_input/prepare_output functions
652 * to transmit header information to the mode input/output functions.
653 */
654struct xfrm_mode_skb_cb {
655 struct xfrm_tunnel_skb_cb header;
656
657 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
658 __be16 id;
659 __be16 frag_off;
660
661 /* IP header length (excluding options or extension headers). */
662 u8 ihl;
663
664 /* TOS for IPv4, class for IPv6. */
665 u8 tos;
666
667 /* TTL for IPv4, hop limitfor IPv6. */
668 u8 ttl;
669
670 /* Protocol for IPv4, NH for IPv6. */
671 u8 protocol;
672
673 /* Option length for IPv4, zero for IPv6. */
674 u8 optlen;
675
676 /* Used by IPv6 only, zero for IPv4. */
677 u8 flow_lbl[3];
678};
679
680#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
681
682/*
683 * This structure is used by the input processing to locate the SPI and
684 * related information.
685 */
686struct xfrm_spi_skb_cb {
687 struct xfrm_tunnel_skb_cb header;
688
689 unsigned int daddroff;
690 unsigned int family;
691 __be32 seq;
692};
693
694#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
695
696#ifdef CONFIG_AUDITSYSCALL
697static inline struct audit_buffer *xfrm_audit_start(const char *op)
698{
699 struct audit_buffer *audit_buf = NULL;
700
701 if (audit_enabled == AUDIT_OFF)
702 return NULL;
703 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
704 AUDIT_MAC_IPSEC_EVENT);
705 if (audit_buf == NULL)
706 return NULL;
707 audit_log_format(audit_buf, "op=%s", op);
708 return audit_buf;
709}
710
711static inline void xfrm_audit_helper_usrinfo(bool task_valid,
712 struct audit_buffer *audit_buf)
713{
714 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
715 audit_get_loginuid(current) :
716 INVALID_UID);
717 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
718 AUDIT_SID_UNSET;
719
720 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
721 audit_log_task_context(audit_buf);
722}
723
724void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
725void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
726 bool task_valid);
727void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
728void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
729void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
730 struct sk_buff *skb);
731void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
732 __be32 net_seq);
733void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
734void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
735 __be32 net_seq);
736void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
737 u8 proto);
738#else
739
740static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
741 bool task_valid)
742{
743}
744
745static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
746 bool task_valid)
747{
748}
749
750static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
751 bool task_valid)
752{
753}
754
755static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
756 bool task_valid)
757{
758}
759
760static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
761 struct sk_buff *skb)
762{
763}
764
765static inline void xfrm_audit_state_replay(struct xfrm_state *x,
766 struct sk_buff *skb, __be32 net_seq)
767{
768}
769
770static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
771 u16 family)
772{
773}
774
775static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
776 __be32 net_spi, __be32 net_seq)
777{
778}
779
780static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
781 struct sk_buff *skb, u8 proto)
782{
783}
784#endif /* CONFIG_AUDITSYSCALL */
785
786static inline void xfrm_pol_hold(struct xfrm_policy *policy)
787{
788 if (likely(policy != NULL))
789 refcount_inc(&policy->refcnt);
790}
791
792void xfrm_policy_destroy(struct xfrm_policy *policy);
793
794static inline void xfrm_pol_put(struct xfrm_policy *policy)
795{
796 if (refcount_dec_and_test(&policy->refcnt))
797 xfrm_policy_destroy(policy);
798}
799
800static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
801{
802 int i;
803 for (i = npols - 1; i >= 0; --i)
804 xfrm_pol_put(pols[i]);
805}
806
807void __xfrm_state_destroy(struct xfrm_state *, bool);
808
809static inline void __xfrm_state_put(struct xfrm_state *x)
810{
811 refcount_dec(&x->refcnt);
812}
813
814static inline void xfrm_state_put(struct xfrm_state *x)
815{
816 if (refcount_dec_and_test(&x->refcnt))
817 __xfrm_state_destroy(x, false);
818}
819
820static inline void xfrm_state_put_sync(struct xfrm_state *x)
821{
822 if (refcount_dec_and_test(&x->refcnt))
823 __xfrm_state_destroy(x, true);
824}
825
826static inline void xfrm_state_hold(struct xfrm_state *x)
827{
828 refcount_inc(&x->refcnt);
829}
830
831static inline bool addr_match(const void *token1, const void *token2,
832 unsigned int prefixlen)
833{
834 const __be32 *a1 = token1;
835 const __be32 *a2 = token2;
836 unsigned int pdw;
837 unsigned int pbi;
838
839 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
840 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
841
842 if (pdw)
843 if (memcmp(a1, a2, pdw << 2))
844 return false;
845
846 if (pbi) {
847 __be32 mask;
848
849 mask = htonl((0xffffffff) << (32 - pbi));
850
851 if ((a1[pdw] ^ a2[pdw]) & mask)
852 return false;
853 }
854
855 return true;
856}
857
858static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
859{
860 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
861 if (sizeof(long) == 4 && prefixlen == 0)
862 return true;
863 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
864}
865
866static __inline__
867__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
868{
869 __be16 port;
870 switch(fl->flowi_proto) {
871 case IPPROTO_TCP:
872 case IPPROTO_UDP:
873 case IPPROTO_UDPLITE:
874 case IPPROTO_SCTP:
875 port = uli->ports.sport;
876 break;
877 case IPPROTO_ICMP:
878 case IPPROTO_ICMPV6:
879 port = htons(uli->icmpt.type);
880 break;
881 case IPPROTO_MH:
882 port = htons(uli->mht.type);
883 break;
884 case IPPROTO_GRE:
885 port = htons(ntohl(uli->gre_key) >> 16);
886 break;
887 default:
888 port = 0; /*XXX*/
889 }
890 return port;
891}
892
893static __inline__
894__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
895{
896 __be16 port;
897 switch(fl->flowi_proto) {
898 case IPPROTO_TCP:
899 case IPPROTO_UDP:
900 case IPPROTO_UDPLITE:
901 case IPPROTO_SCTP:
902 port = uli->ports.dport;
903 break;
904 case IPPROTO_ICMP:
905 case IPPROTO_ICMPV6:
906 port = htons(uli->icmpt.code);
907 break;
908 case IPPROTO_GRE:
909 port = htons(ntohl(uli->gre_key) & 0xffff);
910 break;
911 default:
912 port = 0; /*XXX*/
913 }
914 return port;
915}
916
917bool xfrm_selector_match(const struct xfrm_selector *sel,
918 const struct flowi *fl, unsigned short family);
919
920#ifdef CONFIG_SECURITY_NETWORK_XFRM
921/* If neither has a context --> match
922 * Otherwise, both must have a context and the sids, doi, alg must match
923 */
924static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
925{
926 return ((!s1 && !s2) ||
927 (s1 && s2 &&
928 (s1->ctx_sid == s2->ctx_sid) &&
929 (s1->ctx_doi == s2->ctx_doi) &&
930 (s1->ctx_alg == s2->ctx_alg)));
931}
932#else
933static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
934{
935 return true;
936}
937#endif
938
939/* A struct encoding bundle of transformations to apply to some set of flow.
940 *
941 * xdst->child points to the next element of bundle.
942 * dst->xfrm points to an instanse of transformer.
943 *
944 * Due to unfortunate limitations of current routing cache, which we
945 * have no time to fix, it mirrors struct rtable and bound to the same
946 * routing key, including saddr,daddr. However, we can have many of
947 * bundles differing by session id. All the bundles grow from a parent
948 * policy rule.
949 */
950struct xfrm_dst {
951 union {
952 struct dst_entry dst;
953 struct rtable rt;
954 struct rt6_info rt6;
955 } u;
956 struct dst_entry *route;
957 struct dst_entry *child;
958 struct dst_entry *path;
959 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
960 int num_pols, num_xfrms;
961 u32 xfrm_genid;
962 u32 policy_genid;
963 u32 route_mtu_cached;
964 u32 child_mtu_cached;
965 u32 route_cookie;
966 u32 path_cookie;
967};
968
969static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
970{
971#ifdef CONFIG_XFRM
972 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
973 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
974
975 return xdst->path;
976 }
977#endif
978 return (struct dst_entry *) dst;
979}
980
981static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
982{
983#ifdef CONFIG_XFRM
984 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
985 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
986 return xdst->child;
987 }
988#endif
989 return NULL;
990}
991
992#ifdef CONFIG_XFRM
993static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
994{
995 xdst->child = child;
996}
997
998static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
999{
1000 xfrm_pols_put(xdst->pols, xdst->num_pols);
1001 dst_release(xdst->route);
1002 if (likely(xdst->u.dst.xfrm))
1003 xfrm_state_put(xdst->u.dst.xfrm);
1004}
1005#endif
1006
1007void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1008
1009struct xfrm_if_parms {
1010 int link; /* ifindex of underlying L2 interface */
1011 u32 if_id; /* interface identifyer */
1012 bool collect_md;
1013};
1014
1015struct xfrm_if {
1016 struct xfrm_if __rcu *next; /* next interface in list */
1017 struct net_device *dev; /* virtual device associated with interface */
1018 struct net *net; /* netns for packet i/o */
1019 struct xfrm_if_parms p; /* interface parms */
1020
1021 struct gro_cells gro_cells;
1022};
1023
1024struct xfrm_offload {
1025 /* Output sequence number for replay protection on offloading. */
1026 struct {
1027 __u32 low;
1028 __u32 hi;
1029 } seq;
1030
1031 __u32 flags;
1032#define SA_DELETE_REQ 1
1033#define CRYPTO_DONE 2
1034#define CRYPTO_NEXT_DONE 4
1035#define CRYPTO_FALLBACK 8
1036#define XFRM_GSO_SEGMENT 16
1037#define XFRM_GRO 32
1038/* 64 is free */
1039#define XFRM_DEV_RESUME 128
1040#define XFRM_XMIT 256
1041
1042 __u32 status;
1043#define CRYPTO_SUCCESS 1
1044#define CRYPTO_GENERIC_ERROR 2
1045#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1046#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1047#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1048#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1049#define CRYPTO_INVALID_PACKET_SYNTAX 64
1050#define CRYPTO_INVALID_PROTOCOL 128
1051
1052 /* Used to keep whole l2 header for transport mode GRO */
1053 __u32 orig_mac_len;
1054
1055 __u8 proto;
1056 __u8 inner_ipproto;
1057};
1058
1059struct sec_path {
1060 int len;
1061 int olen;
1062 int verified_cnt;
1063
1064 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1065 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1066};
1067
1068struct sec_path *secpath_set(struct sk_buff *skb);
1069
1070static inline void
1071secpath_reset(struct sk_buff *skb)
1072{
1073#ifdef CONFIG_XFRM
1074 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1075#endif
1076}
1077
1078static inline int
1079xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1080{
1081 switch (family) {
1082 case AF_INET:
1083 return addr->a4 == 0;
1084 case AF_INET6:
1085 return ipv6_addr_any(&addr->in6);
1086 }
1087 return 0;
1088}
1089
1090static inline int
1091__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1092{
1093 return (tmpl->saddr.a4 &&
1094 tmpl->saddr.a4 != x->props.saddr.a4);
1095}
1096
1097static inline int
1098__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1099{
1100 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1101 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1102}
1103
1104static inline int
1105xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1106{
1107 switch (family) {
1108 case AF_INET:
1109 return __xfrm4_state_addr_cmp(tmpl, x);
1110 case AF_INET6:
1111 return __xfrm6_state_addr_cmp(tmpl, x);
1112 }
1113 return !0;
1114}
1115
1116#ifdef CONFIG_XFRM
1117static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1118{
1119 struct sec_path *sp = skb_sec_path(skb);
1120
1121 return sp->xvec[sp->len - 1];
1122}
1123#endif
1124
1125static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1126{
1127#ifdef CONFIG_XFRM
1128 struct sec_path *sp = skb_sec_path(skb);
1129
1130 if (!sp || !sp->olen || sp->len != sp->olen)
1131 return NULL;
1132
1133 return &sp->ovec[sp->olen - 1];
1134#else
1135 return NULL;
1136#endif
1137}
1138
1139#ifdef CONFIG_XFRM
1140int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1141 unsigned short family);
1142
1143static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1144 int dir)
1145{
1146 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1147 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1148
1149 return false;
1150}
1151
1152static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1153 int dir, unsigned short family)
1154{
1155 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1156 /* same dst may be used for traffic originating from
1157 * devices with different policy settings.
1158 */
1159 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1160 }
1161 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1162}
1163
1164static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1165 struct sk_buff *skb,
1166 unsigned int family, int reverse)
1167{
1168 struct net *net = dev_net(skb->dev);
1169 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1170 struct xfrm_offload *xo = xfrm_offload(skb);
1171 struct xfrm_state *x;
1172
1173 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1174 return __xfrm_policy_check(sk, ndir, skb, family);
1175
1176 if (xo) {
1177 x = xfrm_input_state(skb);
1178 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1179 return (xo->flags & CRYPTO_DONE) &&
1180 (xo->status & CRYPTO_SUCCESS);
1181 }
1182
1183 return __xfrm_check_nopolicy(net, skb, dir) ||
1184 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1185 __xfrm_policy_check(sk, ndir, skb, family);
1186}
1187
1188static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1189{
1190 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1191}
1192
1193static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1194{
1195 return xfrm_policy_check(sk, dir, skb, AF_INET);
1196}
1197
1198static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1199{
1200 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1201}
1202
1203static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1204 struct sk_buff *skb)
1205{
1206 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1207}
1208
1209static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1210 struct sk_buff *skb)
1211{
1212 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1213}
1214
1215int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1216 unsigned int family, int reverse);
1217
1218static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1219 unsigned int family)
1220{
1221 return __xfrm_decode_session(net, skb, fl, family, 0);
1222}
1223
1224static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1225 struct flowi *fl,
1226 unsigned int family)
1227{
1228 return __xfrm_decode_session(net, skb, fl, family, 1);
1229}
1230
1231int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1232
1233static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1234{
1235 struct net *net = dev_net(skb->dev);
1236
1237 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1238 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1239 return true;
1240
1241 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1242 __xfrm_route_forward(skb, family);
1243}
1244
1245static inline int xfrm4_route_forward(struct sk_buff *skb)
1246{
1247 return xfrm_route_forward(skb, AF_INET);
1248}
1249
1250static inline int xfrm6_route_forward(struct sk_buff *skb)
1251{
1252 return xfrm_route_forward(skb, AF_INET6);
1253}
1254
1255int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1256
1257static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1258{
1259 if (!sk_fullsock(osk))
1260 return 0;
1261 sk->sk_policy[0] = NULL;
1262 sk->sk_policy[1] = NULL;
1263 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1264 return __xfrm_sk_clone_policy(sk, osk);
1265 return 0;
1266}
1267
1268int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1269
1270static inline void xfrm_sk_free_policy(struct sock *sk)
1271{
1272 struct xfrm_policy *pol;
1273
1274 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1275 if (unlikely(pol != NULL)) {
1276 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1277 sk->sk_policy[0] = NULL;
1278 }
1279 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1280 if (unlikely(pol != NULL)) {
1281 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1282 sk->sk_policy[1] = NULL;
1283 }
1284}
1285
1286#else
1287
1288static inline void xfrm_sk_free_policy(struct sock *sk) {}
1289static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1290static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1291static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1292static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1293{
1294 return 1;
1295}
1296static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1297{
1298 return 1;
1299}
1300static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1301{
1302 return 1;
1303}
1304static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1305 struct flowi *fl,
1306 unsigned int family)
1307{
1308 return -ENOSYS;
1309}
1310static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1311 struct sk_buff *skb)
1312{
1313 return 1;
1314}
1315static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1316 struct sk_buff *skb)
1317{
1318 return 1;
1319}
1320#endif
1321
1322static __inline__
1323xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1324{
1325 switch (family){
1326 case AF_INET:
1327 return (xfrm_address_t *)&fl->u.ip4.daddr;
1328 case AF_INET6:
1329 return (xfrm_address_t *)&fl->u.ip6.daddr;
1330 }
1331 return NULL;
1332}
1333
1334static __inline__
1335xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1336{
1337 switch (family){
1338 case AF_INET:
1339 return (xfrm_address_t *)&fl->u.ip4.saddr;
1340 case AF_INET6:
1341 return (xfrm_address_t *)&fl->u.ip6.saddr;
1342 }
1343 return NULL;
1344}
1345
1346static __inline__
1347void xfrm_flowi_addr_get(const struct flowi *fl,
1348 xfrm_address_t *saddr, xfrm_address_t *daddr,
1349 unsigned short family)
1350{
1351 switch(family) {
1352 case AF_INET:
1353 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1354 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1355 break;
1356 case AF_INET6:
1357 saddr->in6 = fl->u.ip6.saddr;
1358 daddr->in6 = fl->u.ip6.daddr;
1359 break;
1360 }
1361}
1362
1363static __inline__ int
1364__xfrm4_state_addr_check(const struct xfrm_state *x,
1365 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1366{
1367 if (daddr->a4 == x->id.daddr.a4 &&
1368 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1369 return 1;
1370 return 0;
1371}
1372
1373static __inline__ int
1374__xfrm6_state_addr_check(const struct xfrm_state *x,
1375 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1376{
1377 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1378 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1379 ipv6_addr_any((struct in6_addr *)saddr) ||
1380 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1381 return 1;
1382 return 0;
1383}
1384
1385static __inline__ int
1386xfrm_state_addr_check(const struct xfrm_state *x,
1387 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1388 unsigned short family)
1389{
1390 switch (family) {
1391 case AF_INET:
1392 return __xfrm4_state_addr_check(x, daddr, saddr);
1393 case AF_INET6:
1394 return __xfrm6_state_addr_check(x, daddr, saddr);
1395 }
1396 return 0;
1397}
1398
1399static __inline__ int
1400xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1401 unsigned short family)
1402{
1403 switch (family) {
1404 case AF_INET:
1405 return __xfrm4_state_addr_check(x,
1406 (const xfrm_address_t *)&fl->u.ip4.daddr,
1407 (const xfrm_address_t *)&fl->u.ip4.saddr);
1408 case AF_INET6:
1409 return __xfrm6_state_addr_check(x,
1410 (const xfrm_address_t *)&fl->u.ip6.daddr,
1411 (const xfrm_address_t *)&fl->u.ip6.saddr);
1412 }
1413 return 0;
1414}
1415
1416static inline int xfrm_state_kern(const struct xfrm_state *x)
1417{
1418 return atomic_read(&x->tunnel_users);
1419}
1420
1421static inline bool xfrm_id_proto_valid(u8 proto)
1422{
1423 switch (proto) {
1424 case IPPROTO_AH:
1425 case IPPROTO_ESP:
1426 case IPPROTO_COMP:
1427#if IS_ENABLED(CONFIG_IPV6)
1428 case IPPROTO_ROUTING:
1429 case IPPROTO_DSTOPTS:
1430#endif
1431 return true;
1432 default:
1433 return false;
1434 }
1435}
1436
1437/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1438static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1439{
1440 return (!userproto || proto == userproto ||
1441 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1442 proto == IPPROTO_ESP ||
1443 proto == IPPROTO_COMP)));
1444}
1445
1446/*
1447 * xfrm algorithm information
1448 */
1449struct xfrm_algo_aead_info {
1450 char *geniv;
1451 u16 icv_truncbits;
1452};
1453
1454struct xfrm_algo_auth_info {
1455 u16 icv_truncbits;
1456 u16 icv_fullbits;
1457};
1458
1459struct xfrm_algo_encr_info {
1460 char *geniv;
1461 u16 blockbits;
1462 u16 defkeybits;
1463};
1464
1465struct xfrm_algo_comp_info {
1466 u16 threshold;
1467};
1468
1469struct xfrm_algo_desc {
1470 char *name;
1471 char *compat;
1472 u8 available:1;
1473 u8 pfkey_supported:1;
1474 union {
1475 struct xfrm_algo_aead_info aead;
1476 struct xfrm_algo_auth_info auth;
1477 struct xfrm_algo_encr_info encr;
1478 struct xfrm_algo_comp_info comp;
1479 } uinfo;
1480 struct sadb_alg desc;
1481};
1482
1483/* XFRM protocol handlers. */
1484struct xfrm4_protocol {
1485 int (*handler)(struct sk_buff *skb);
1486 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1487 int encap_type);
1488 int (*cb_handler)(struct sk_buff *skb, int err);
1489 int (*err_handler)(struct sk_buff *skb, u32 info);
1490
1491 struct xfrm4_protocol __rcu *next;
1492 int priority;
1493};
1494
1495struct xfrm6_protocol {
1496 int (*handler)(struct sk_buff *skb);
1497 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1498 int encap_type);
1499 int (*cb_handler)(struct sk_buff *skb, int err);
1500 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1501 u8 type, u8 code, int offset, __be32 info);
1502
1503 struct xfrm6_protocol __rcu *next;
1504 int priority;
1505};
1506
1507/* XFRM tunnel handlers. */
1508struct xfrm_tunnel {
1509 int (*handler)(struct sk_buff *skb);
1510 int (*cb_handler)(struct sk_buff *skb, int err);
1511 int (*err_handler)(struct sk_buff *skb, u32 info);
1512
1513 struct xfrm_tunnel __rcu *next;
1514 int priority;
1515};
1516
1517struct xfrm6_tunnel {
1518 int (*handler)(struct sk_buff *skb);
1519 int (*cb_handler)(struct sk_buff *skb, int err);
1520 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1521 u8 type, u8 code, int offset, __be32 info);
1522 struct xfrm6_tunnel __rcu *next;
1523 int priority;
1524};
1525
1526void xfrm_init(void);
1527void xfrm4_init(void);
1528int xfrm_state_init(struct net *net);
1529void xfrm_state_fini(struct net *net);
1530void xfrm4_state_init(void);
1531void xfrm4_protocol_init(void);
1532#ifdef CONFIG_XFRM
1533int xfrm6_init(void);
1534void xfrm6_fini(void);
1535int xfrm6_state_init(void);
1536void xfrm6_state_fini(void);
1537int xfrm6_protocol_init(void);
1538void xfrm6_protocol_fini(void);
1539#else
1540static inline int xfrm6_init(void)
1541{
1542 return 0;
1543}
1544static inline void xfrm6_fini(void)
1545{
1546 ;
1547}
1548#endif
1549
1550#ifdef CONFIG_XFRM_STATISTICS
1551int xfrm_proc_init(struct net *net);
1552void xfrm_proc_fini(struct net *net);
1553#endif
1554
1555int xfrm_sysctl_init(struct net *net);
1556#ifdef CONFIG_SYSCTL
1557void xfrm_sysctl_fini(struct net *net);
1558#else
1559static inline void xfrm_sysctl_fini(struct net *net)
1560{
1561}
1562#endif
1563
1564void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1565 struct xfrm_address_filter *filter);
1566int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1567 int (*func)(struct xfrm_state *, int, void*), void *);
1568void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1569struct xfrm_state *xfrm_state_alloc(struct net *net);
1570void xfrm_state_free(struct xfrm_state *x);
1571struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1572 const xfrm_address_t *saddr,
1573 const struct flowi *fl,
1574 struct xfrm_tmpl *tmpl,
1575 struct xfrm_policy *pol, int *err,
1576 unsigned short family, u32 if_id);
1577struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1578 xfrm_address_t *daddr,
1579 xfrm_address_t *saddr,
1580 unsigned short family,
1581 u8 mode, u8 proto, u32 reqid);
1582struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1583 unsigned short family);
1584int xfrm_state_check_expire(struct xfrm_state *x);
1585void xfrm_state_update_stats(struct net *net);
1586#ifdef CONFIG_XFRM_OFFLOAD
1587static inline void xfrm_dev_state_update_stats(struct xfrm_state *x)
1588{
1589 struct xfrm_dev_offload *xdo = &x->xso;
1590 struct net_device *dev = xdo->dev;
1591
1592 if (dev && dev->xfrmdev_ops &&
1593 dev->xfrmdev_ops->xdo_dev_state_update_stats)
1594 dev->xfrmdev_ops->xdo_dev_state_update_stats(x);
1595
1596}
1597#else
1598static inline void xfrm_dev_state_update_stats(struct xfrm_state *x) {}
1599#endif
1600void xfrm_state_insert(struct xfrm_state *x);
1601int xfrm_state_add(struct xfrm_state *x);
1602int xfrm_state_update(struct xfrm_state *x);
1603struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1604 const xfrm_address_t *daddr, __be32 spi,
1605 u8 proto, unsigned short family);
1606struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1607 const xfrm_address_t *daddr,
1608 const xfrm_address_t *saddr,
1609 u8 proto,
1610 unsigned short family);
1611#ifdef CONFIG_XFRM_SUB_POLICY
1612void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1613 unsigned short family);
1614void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1615 unsigned short family);
1616#else
1617static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1618 int n, unsigned short family)
1619{
1620}
1621
1622static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1623 int n, unsigned short family)
1624{
1625}
1626#endif
1627
1628struct xfrmk_sadinfo {
1629 u32 sadhcnt; /* current hash bkts */
1630 u32 sadhmcnt; /* max allowed hash bkts */
1631 u32 sadcnt; /* current running count */
1632};
1633
1634struct xfrmk_spdinfo {
1635 u32 incnt;
1636 u32 outcnt;
1637 u32 fwdcnt;
1638 u32 inscnt;
1639 u32 outscnt;
1640 u32 fwdscnt;
1641 u32 spdhcnt;
1642 u32 spdhmcnt;
1643};
1644
1645struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1646int xfrm_state_delete(struct xfrm_state *x);
1647int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1648int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1649int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1650 bool task_valid);
1651void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1652void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1653u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1654int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1655u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1656int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1657 struct netlink_ext_ack *extack);
1658int xfrm_init_state(struct xfrm_state *x);
1659int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1660int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1661int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1662 int (*finish)(struct net *, struct sock *,
1663 struct sk_buff *));
1664int xfrm_trans_queue(struct sk_buff *skb,
1665 int (*finish)(struct net *, struct sock *,
1666 struct sk_buff *));
1667int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1668int xfrm_output(struct sock *sk, struct sk_buff *skb);
1669
1670#if IS_ENABLED(CONFIG_NET_PKTGEN)
1671int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1672#endif
1673
1674void xfrm_local_error(struct sk_buff *skb, int mtu);
1675int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1676 int encap_type);
1677int xfrm4_transport_finish(struct sk_buff *skb, int async);
1678int xfrm4_rcv(struct sk_buff *skb);
1679
1680static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1681{
1682 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1683 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1684 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1685 return xfrm_input(skb, nexthdr, spi, 0);
1686}
1687
1688int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1689int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1690int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1691int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1692int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1693void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1694int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1695 struct ip6_tnl *t);
1696int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1697 int encap_type);
1698int xfrm6_transport_finish(struct sk_buff *skb, int async);
1699int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1700int xfrm6_rcv(struct sk_buff *skb);
1701int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1702 xfrm_address_t *saddr, u8 proto);
1703void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1704int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1705int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1706int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1707int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1708__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1709__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1710int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1711
1712#ifdef CONFIG_XFRM
1713void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1714int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1715int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1716struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1717 struct sk_buff *skb);
1718struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1719 struct sk_buff *skb);
1720int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1721 int optlen);
1722#else
1723static inline int xfrm_user_policy(struct sock *sk, int optname,
1724 sockptr_t optval, int optlen)
1725{
1726 return -ENOPROTOOPT;
1727}
1728#endif
1729
1730struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1731 const xfrm_address_t *saddr,
1732 const xfrm_address_t *daddr,
1733 int family, u32 mark);
1734
1735struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1736
1737void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1738int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1739 int (*func)(struct xfrm_policy *, int, int, void*),
1740 void *);
1741void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1742int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1743struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1744 const struct xfrm_mark *mark,
1745 u32 if_id, u8 type, int dir,
1746 struct xfrm_selector *sel,
1747 struct xfrm_sec_ctx *ctx, int delete,
1748 int *err);
1749struct xfrm_policy *xfrm_policy_byid(struct net *net,
1750 const struct xfrm_mark *mark, u32 if_id,
1751 u8 type, int dir, u32 id, int delete,
1752 int *err);
1753int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1754void xfrm_policy_hash_rebuild(struct net *net);
1755u32 xfrm_get_acqseq(void);
1756int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1757int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1758 struct netlink_ext_ack *extack);
1759struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1760 u8 mode, u32 reqid, u32 if_id, u8 proto,
1761 const xfrm_address_t *daddr,
1762 const xfrm_address_t *saddr, int create,
1763 unsigned short family);
1764int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1765
1766#ifdef CONFIG_XFRM_MIGRATE
1767int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1768 const struct xfrm_migrate *m, int num_bundles,
1769 const struct xfrm_kmaddress *k,
1770 const struct xfrm_encap_tmpl *encap);
1771struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1772 u32 if_id);
1773struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1774 struct xfrm_migrate *m,
1775 struct xfrm_encap_tmpl *encap);
1776int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1777 struct xfrm_migrate *m, int num_bundles,
1778 struct xfrm_kmaddress *k, struct net *net,
1779 struct xfrm_encap_tmpl *encap, u32 if_id,
1780 struct netlink_ext_ack *extack);
1781#endif
1782
1783int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1784void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1785int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1786 xfrm_address_t *addr);
1787
1788void xfrm_input_init(void);
1789int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1790
1791void xfrm_probe_algs(void);
1792int xfrm_count_pfkey_auth_supported(void);
1793int xfrm_count_pfkey_enc_supported(void);
1794struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1795struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1796struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1797struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1798struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1799struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1800struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1801struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1802struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1803 int probe);
1804
1805static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1806 const xfrm_address_t *b)
1807{
1808 return ipv6_addr_equal((const struct in6_addr *)a,
1809 (const struct in6_addr *)b);
1810}
1811
1812static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1813 const xfrm_address_t *b,
1814 sa_family_t family)
1815{
1816 switch (family) {
1817 default:
1818 case AF_INET:
1819 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1820 case AF_INET6:
1821 return xfrm6_addr_equal(a, b);
1822 }
1823}
1824
1825static inline int xfrm_policy_id2dir(u32 index)
1826{
1827 return index & 7;
1828}
1829
1830#ifdef CONFIG_XFRM
1831void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1832int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1833void xfrm_replay_notify(struct xfrm_state *x, int event);
1834int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1835int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1836
1837static inline int xfrm_aevent_is_on(struct net *net)
1838{
1839 struct sock *nlsk;
1840 int ret = 0;
1841
1842 rcu_read_lock();
1843 nlsk = rcu_dereference(net->xfrm.nlsk);
1844 if (nlsk)
1845 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1846 rcu_read_unlock();
1847 return ret;
1848}
1849
1850static inline int xfrm_acquire_is_on(struct net *net)
1851{
1852 struct sock *nlsk;
1853 int ret = 0;
1854
1855 rcu_read_lock();
1856 nlsk = rcu_dereference(net->xfrm.nlsk);
1857 if (nlsk)
1858 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1859 rcu_read_unlock();
1860
1861 return ret;
1862}
1863#endif
1864
1865static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1866{
1867 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1868}
1869
1870static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1871{
1872 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1873}
1874
1875static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1876{
1877 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1878}
1879
1880static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1881{
1882 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1883}
1884
1885#ifdef CONFIG_XFRM_MIGRATE
1886static inline int xfrm_replay_clone(struct xfrm_state *x,
1887 struct xfrm_state *orig)
1888{
1889
1890 x->replay_esn = kmemdup(orig->replay_esn,
1891 xfrm_replay_state_esn_len(orig->replay_esn),
1892 GFP_KERNEL);
1893 if (!x->replay_esn)
1894 return -ENOMEM;
1895 x->preplay_esn = kmemdup(orig->preplay_esn,
1896 xfrm_replay_state_esn_len(orig->preplay_esn),
1897 GFP_KERNEL);
1898 if (!x->preplay_esn)
1899 return -ENOMEM;
1900
1901 return 0;
1902}
1903
1904static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1905{
1906 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1907}
1908
1909
1910static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1911{
1912 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1913}
1914
1915static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1916{
1917 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1918}
1919
1920static inline void xfrm_states_put(struct xfrm_state **states, int n)
1921{
1922 int i;
1923 for (i = 0; i < n; i++)
1924 xfrm_state_put(*(states + i));
1925}
1926
1927static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1928{
1929 int i;
1930 for (i = 0; i < n; i++)
1931 xfrm_state_delete(*(states + i));
1932}
1933#endif
1934
1935void __init xfrm_dev_init(void);
1936
1937#ifdef CONFIG_XFRM_OFFLOAD
1938void xfrm_dev_resume(struct sk_buff *skb);
1939void xfrm_dev_backlog(struct softnet_data *sd);
1940struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1941int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1942 struct xfrm_user_offload *xuo,
1943 struct netlink_ext_ack *extack);
1944int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1945 struct xfrm_user_offload *xuo, u8 dir,
1946 struct netlink_ext_ack *extack);
1947bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1948
1949static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1950{
1951 struct xfrm_dev_offload *xso = &x->xso;
1952
1953 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1954 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1955}
1956
1957static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1958{
1959 struct xfrm_state *x = dst->xfrm;
1960 struct xfrm_dst *xdst;
1961
1962 if (!x || !x->type_offload)
1963 return false;
1964
1965 xdst = (struct xfrm_dst *) dst;
1966 if (!x->xso.offload_handle && !xdst->child->xfrm)
1967 return true;
1968 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1969 !xdst->child->xfrm)
1970 return true;
1971
1972 return false;
1973}
1974
1975static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1976{
1977 struct xfrm_dev_offload *xso = &x->xso;
1978
1979 if (xso->dev)
1980 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1981}
1982
1983static inline void xfrm_dev_state_free(struct xfrm_state *x)
1984{
1985 struct xfrm_dev_offload *xso = &x->xso;
1986 struct net_device *dev = xso->dev;
1987
1988 if (dev && dev->xfrmdev_ops) {
1989 if (dev->xfrmdev_ops->xdo_dev_state_free)
1990 dev->xfrmdev_ops->xdo_dev_state_free(x);
1991 xso->dev = NULL;
1992 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1993 netdev_put(dev, &xso->dev_tracker);
1994 }
1995}
1996
1997static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1998{
1999 struct xfrm_dev_offload *xdo = &x->xdo;
2000 struct net_device *dev = xdo->dev;
2001
2002 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
2003 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
2004}
2005
2006static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2007{
2008 struct xfrm_dev_offload *xdo = &x->xdo;
2009 struct net_device *dev = xdo->dev;
2010
2011 if (dev && dev->xfrmdev_ops) {
2012 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2013 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2014 xdo->dev = NULL;
2015 netdev_put(dev, &xdo->dev_tracker);
2016 }
2017}
2018#else
2019static inline void xfrm_dev_resume(struct sk_buff *skb)
2020{
2021}
2022
2023static inline void xfrm_dev_backlog(struct softnet_data *sd)
2024{
2025}
2026
2027static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2028{
2029 return skb;
2030}
2031
2032static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2033{
2034 return 0;
2035}
2036
2037static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2038{
2039}
2040
2041static inline void xfrm_dev_state_free(struct xfrm_state *x)
2042{
2043}
2044
2045static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2046 struct xfrm_user_offload *xuo, u8 dir,
2047 struct netlink_ext_ack *extack)
2048{
2049 return 0;
2050}
2051
2052static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2053{
2054}
2055
2056static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2057{
2058}
2059
2060static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2061{
2062 return false;
2063}
2064
2065static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2066{
2067}
2068
2069static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2070{
2071 return false;
2072}
2073#endif
2074
2075static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2076{
2077 if (attrs[XFRMA_MARK])
2078 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2079 else
2080 m->v = m->m = 0;
2081
2082 return m->v & m->m;
2083}
2084
2085static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2086{
2087 int ret = 0;
2088
2089 if (m->m | m->v)
2090 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2091 return ret;
2092}
2093
2094static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2095{
2096 struct xfrm_mark *m = &x->props.smark;
2097
2098 return (m->v & m->m) | (mark & ~m->m);
2099}
2100
2101static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2102{
2103 int ret = 0;
2104
2105 if (if_id)
2106 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2107 return ret;
2108}
2109
2110static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2111 unsigned int family)
2112{
2113 bool tunnel = false;
2114
2115 switch(family) {
2116 case AF_INET:
2117 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2118 tunnel = true;
2119 break;
2120 case AF_INET6:
2121 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2122 tunnel = true;
2123 break;
2124 }
2125 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2126 return -EINVAL;
2127
2128 return 0;
2129}
2130
2131extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2132extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2133
2134struct xfrm_translator {
2135 /* Allocate frag_list and put compat translation there */
2136 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2137
2138 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2139 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2140 int maxtype, const struct nla_policy *policy,
2141 struct netlink_ext_ack *extack);
2142
2143 /* Translate 32-bit user_policy from sockptr */
2144 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2145
2146 struct module *owner;
2147};
2148
2149#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2150extern int xfrm_register_translator(struct xfrm_translator *xtr);
2151extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2152extern struct xfrm_translator *xfrm_get_translator(void);
2153extern void xfrm_put_translator(struct xfrm_translator *xtr);
2154#else
2155static inline struct xfrm_translator *xfrm_get_translator(void)
2156{
2157 return NULL;
2158}
2159static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2160{
2161}
2162#endif
2163
2164#if IS_ENABLED(CONFIG_IPV6)
2165static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2166{
2167 int proto;
2168
2169 if (!sk || sk->sk_family != AF_INET6)
2170 return false;
2171
2172 proto = sk->sk_protocol;
2173 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2174 return inet6_test_bit(DONTFRAG, sk);
2175
2176 return false;
2177}
2178#endif
2179
2180#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2181 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2182
2183extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2184
2185int register_xfrm_interface_bpf(void);
2186
2187#else
2188
2189static inline int register_xfrm_interface_bpf(void)
2190{
2191 return 0;
2192}
2193
2194#endif
2195
2196#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF)
2197int register_xfrm_state_bpf(void);
2198#else
2199static inline int register_xfrm_state_bpf(void)
2200{
2201 return 0;
2202}
2203#endif
2204
2205#endif /* _NET_XFRM_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_XFRM_H
3#define _NET_XFRM_H
4
5#include <linux/compiler.h>
6#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/pfkeyv2.h>
12#include <linux/ipsec.h>
13#include <linux/in6.h>
14#include <linux/mutex.h>
15#include <linux/audit.h>
16#include <linux/slab.h>
17#include <linux/refcount.h>
18#include <linux/sockptr.h>
19
20#include <net/sock.h>
21#include <net/dst.h>
22#include <net/ip.h>
23#include <net/route.h>
24#include <net/ipv6.h>
25#include <net/ip6_fib.h>
26#include <net/flow.h>
27#include <net/gro_cells.h>
28
29#include <linux/interrupt.h>
30
31#ifdef CONFIG_XFRM_STATISTICS
32#include <net/snmp.h>
33#endif
34
35#define XFRM_PROTO_ESP 50
36#define XFRM_PROTO_AH 51
37#define XFRM_PROTO_COMP 108
38#define XFRM_PROTO_IPIP 4
39#define XFRM_PROTO_IPV6 41
40#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
41#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
42
43#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
44#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
45#define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51
52#ifdef CONFIG_XFRM_STATISTICS
53#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54#else
55#define XFRM_INC_STATS(net, field) ((void)(net))
56#endif
57
58
59/* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 u8 dying;
124 u8 proto;
125 u32 seq;
126 struct xfrm_address_filter *filter;
127};
128
129enum {
130 XFRM_DEV_OFFLOAD_IN = 1,
131 XFRM_DEV_OFFLOAD_OUT,
132 XFRM_DEV_OFFLOAD_FWD,
133};
134
135enum {
136 XFRM_DEV_OFFLOAD_UNSPECIFIED,
137 XFRM_DEV_OFFLOAD_CRYPTO,
138 XFRM_DEV_OFFLOAD_PACKET,
139};
140
141struct xfrm_dev_offload {
142 struct net_device *dev;
143 netdevice_tracker dev_tracker;
144 struct net_device *real_dev;
145 unsigned long offload_handle;
146 u8 dir : 2;
147 u8 type : 2;
148};
149
150struct xfrm_mode {
151 u8 encap;
152 u8 family;
153 u8 flags;
154};
155
156/* Flags for xfrm_mode. */
157enum {
158 XFRM_MODE_FLAG_TUNNEL = 1,
159};
160
161enum xfrm_replay_mode {
162 XFRM_REPLAY_MODE_LEGACY,
163 XFRM_REPLAY_MODE_BMP,
164 XFRM_REPLAY_MODE_ESN,
165};
166
167/* Full description of state of transformer. */
168struct xfrm_state {
169 possible_net_t xs_net;
170 union {
171 struct hlist_node gclist;
172 struct hlist_node bydst;
173 };
174 struct hlist_node bysrc;
175 struct hlist_node byspi;
176 struct hlist_node byseq;
177
178 refcount_t refcnt;
179 spinlock_t lock;
180
181 struct xfrm_id id;
182 struct xfrm_selector sel;
183 struct xfrm_mark mark;
184 u32 if_id;
185 u32 tfcpad;
186
187 u32 genid;
188
189 /* Key manager bits */
190 struct xfrm_state_walk km;
191
192 /* Parameters of this state. */
193 struct {
194 u32 reqid;
195 u8 mode;
196 u8 replay_window;
197 u8 aalgo, ealgo, calgo;
198 u8 flags;
199 u16 family;
200 xfrm_address_t saddr;
201 int header_len;
202 int trailer_len;
203 u32 extra_flags;
204 struct xfrm_mark smark;
205 } props;
206
207 struct xfrm_lifetime_cfg lft;
208
209 /* Data for transformer */
210 struct xfrm_algo_auth *aalg;
211 struct xfrm_algo *ealg;
212 struct xfrm_algo *calg;
213 struct xfrm_algo_aead *aead;
214 const char *geniv;
215
216 /* mapping change rate limiting */
217 __be16 new_mapping_sport;
218 u32 new_mapping; /* seconds */
219 u32 mapping_maxage; /* seconds for input SA */
220
221 /* Data for encapsulator */
222 struct xfrm_encap_tmpl *encap;
223 struct sock __rcu *encap_sk;
224
225 /* Data for care-of address */
226 xfrm_address_t *coaddr;
227
228 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
229 struct xfrm_state *tunnel;
230
231 /* If a tunnel, number of users + 1 */
232 atomic_t tunnel_users;
233
234 /* State for replay detection */
235 struct xfrm_replay_state replay;
236 struct xfrm_replay_state_esn *replay_esn;
237
238 /* Replay detection state at the time we sent the last notification */
239 struct xfrm_replay_state preplay;
240 struct xfrm_replay_state_esn *preplay_esn;
241
242 /* replay detection mode */
243 enum xfrm_replay_mode repl_mode;
244 /* internal flag that only holds state for delayed aevent at the
245 * moment
246 */
247 u32 xflags;
248
249 /* Replay detection notification settings */
250 u32 replay_maxage;
251 u32 replay_maxdiff;
252
253 /* Replay detection notification timer */
254 struct timer_list rtimer;
255
256 /* Statistics */
257 struct xfrm_stats stats;
258
259 struct xfrm_lifetime_cur curlft;
260 struct hrtimer mtimer;
261
262 struct xfrm_dev_offload xso;
263
264 /* used to fix curlft->add_time when changing date */
265 long saved_tmo;
266
267 /* Last used time */
268 time64_t lastused;
269
270 struct page_frag xfrag;
271
272 /* Reference to data common to all the instances of this
273 * transformer. */
274 const struct xfrm_type *type;
275 struct xfrm_mode inner_mode;
276 struct xfrm_mode inner_mode_iaf;
277 struct xfrm_mode outer_mode;
278
279 const struct xfrm_type_offload *type_offload;
280
281 /* Security context */
282 struct xfrm_sec_ctx *security;
283
284 /* Private data of this transformer, format is opaque,
285 * interpreted by xfrm_type methods. */
286 void *data;
287};
288
289static inline struct net *xs_net(struct xfrm_state *x)
290{
291 return read_pnet(&x->xs_net);
292}
293
294/* xflags - make enum if more show up */
295#define XFRM_TIME_DEFER 1
296#define XFRM_SOFT_EXPIRE 2
297
298enum {
299 XFRM_STATE_VOID,
300 XFRM_STATE_ACQ,
301 XFRM_STATE_VALID,
302 XFRM_STATE_ERROR,
303 XFRM_STATE_EXPIRED,
304 XFRM_STATE_DEAD
305};
306
307/* callback structure passed from either netlink or pfkey */
308struct km_event {
309 union {
310 u32 hard;
311 u32 proto;
312 u32 byid;
313 u32 aevent;
314 u32 type;
315 } data;
316
317 u32 seq;
318 u32 portid;
319 u32 event;
320 struct net *net;
321};
322
323struct xfrm_if_decode_session_result {
324 struct net *net;
325 u32 if_id;
326};
327
328struct xfrm_if_cb {
329 bool (*decode_session)(struct sk_buff *skb,
330 unsigned short family,
331 struct xfrm_if_decode_session_result *res);
332};
333
334void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
335void xfrm_if_unregister_cb(void);
336
337struct net_device;
338struct xfrm_type;
339struct xfrm_dst;
340struct xfrm_policy_afinfo {
341 struct dst_ops *dst_ops;
342 struct dst_entry *(*dst_lookup)(struct net *net,
343 int tos, int oif,
344 const xfrm_address_t *saddr,
345 const xfrm_address_t *daddr,
346 u32 mark);
347 int (*get_saddr)(struct net *net, int oif,
348 xfrm_address_t *saddr,
349 xfrm_address_t *daddr,
350 u32 mark);
351 int (*fill_dst)(struct xfrm_dst *xdst,
352 struct net_device *dev,
353 const struct flowi *fl);
354 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
355};
356
357int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
358void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
359void km_policy_notify(struct xfrm_policy *xp, int dir,
360 const struct km_event *c);
361void km_state_notify(struct xfrm_state *x, const struct km_event *c);
362
363struct xfrm_tmpl;
364int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
365 struct xfrm_policy *pol);
366void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
367int __xfrm_state_delete(struct xfrm_state *x);
368
369struct xfrm_state_afinfo {
370 u8 family;
371 u8 proto;
372
373 const struct xfrm_type_offload *type_offload_esp;
374
375 const struct xfrm_type *type_esp;
376 const struct xfrm_type *type_ipip;
377 const struct xfrm_type *type_ipip6;
378 const struct xfrm_type *type_comp;
379 const struct xfrm_type *type_ah;
380 const struct xfrm_type *type_routing;
381 const struct xfrm_type *type_dstopts;
382
383 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
384 int (*transport_finish)(struct sk_buff *skb,
385 int async);
386 void (*local_error)(struct sk_buff *skb, u32 mtu);
387};
388
389int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
390int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
391struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
392struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
393
394struct xfrm_input_afinfo {
395 u8 family;
396 bool is_ipip;
397 int (*callback)(struct sk_buff *skb, u8 protocol,
398 int err);
399};
400
401int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
402int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
403
404void xfrm_flush_gc(void);
405void xfrm_state_delete_tunnel(struct xfrm_state *x);
406
407struct xfrm_type {
408 struct module *owner;
409 u8 proto;
410 u8 flags;
411#define XFRM_TYPE_NON_FRAGMENT 1
412#define XFRM_TYPE_REPLAY_PROT 2
413#define XFRM_TYPE_LOCAL_COADDR 4
414#define XFRM_TYPE_REMOTE_COADDR 8
415
416 int (*init_state)(struct xfrm_state *x,
417 struct netlink_ext_ack *extack);
418 void (*destructor)(struct xfrm_state *);
419 int (*input)(struct xfrm_state *, struct sk_buff *skb);
420 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
421 int (*reject)(struct xfrm_state *, struct sk_buff *,
422 const struct flowi *);
423};
424
425int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
426void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
427
428struct xfrm_type_offload {
429 struct module *owner;
430 u8 proto;
431 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
432 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
433 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
434};
435
436int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
437void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
438
439static inline int xfrm_af2proto(unsigned int family)
440{
441 switch(family) {
442 case AF_INET:
443 return IPPROTO_IPIP;
444 case AF_INET6:
445 return IPPROTO_IPV6;
446 default:
447 return 0;
448 }
449}
450
451static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
452{
453 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
454 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
455 return &x->inner_mode;
456 else
457 return &x->inner_mode_iaf;
458}
459
460struct xfrm_tmpl {
461/* id in template is interpreted as:
462 * daddr - destination of tunnel, may be zero for transport mode.
463 * spi - zero to acquire spi. Not zero if spi is static, then
464 * daddr must be fixed too.
465 * proto - AH/ESP/IPCOMP
466 */
467 struct xfrm_id id;
468
469/* Source address of tunnel. Ignored, if it is not a tunnel. */
470 xfrm_address_t saddr;
471
472 unsigned short encap_family;
473
474 u32 reqid;
475
476/* Mode: transport, tunnel etc. */
477 u8 mode;
478
479/* Sharing mode: unique, this session only, this user only etc. */
480 u8 share;
481
482/* May skip this transfomration if no SA is found */
483 u8 optional;
484
485/* Skip aalgos/ealgos/calgos checks. */
486 u8 allalgs;
487
488/* Bit mask of algos allowed for acquisition */
489 u32 aalgos;
490 u32 ealgos;
491 u32 calgos;
492};
493
494#define XFRM_MAX_DEPTH 6
495#define XFRM_MAX_OFFLOAD_DEPTH 1
496
497struct xfrm_policy_walk_entry {
498 struct list_head all;
499 u8 dead;
500};
501
502struct xfrm_policy_walk {
503 struct xfrm_policy_walk_entry walk;
504 u8 type;
505 u32 seq;
506};
507
508struct xfrm_policy_queue {
509 struct sk_buff_head hold_queue;
510 struct timer_list hold_timer;
511 unsigned long timeout;
512};
513
514struct xfrm_policy {
515 possible_net_t xp_net;
516 struct hlist_node bydst;
517 struct hlist_node byidx;
518
519 /* This lock only affects elements except for entry. */
520 rwlock_t lock;
521 refcount_t refcnt;
522 u32 pos;
523 struct timer_list timer;
524
525 atomic_t genid;
526 u32 priority;
527 u32 index;
528 u32 if_id;
529 struct xfrm_mark mark;
530 struct xfrm_selector selector;
531 struct xfrm_lifetime_cfg lft;
532 struct xfrm_lifetime_cur curlft;
533 struct xfrm_policy_walk_entry walk;
534 struct xfrm_policy_queue polq;
535 bool bydst_reinsert;
536 u8 type;
537 u8 action;
538 u8 flags;
539 u8 xfrm_nr;
540 u16 family;
541 struct xfrm_sec_ctx *security;
542 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
543 struct hlist_node bydst_inexact_list;
544 struct rcu_head rcu;
545
546 struct xfrm_dev_offload xdo;
547};
548
549static inline struct net *xp_net(const struct xfrm_policy *xp)
550{
551 return read_pnet(&xp->xp_net);
552}
553
554struct xfrm_kmaddress {
555 xfrm_address_t local;
556 xfrm_address_t remote;
557 u32 reserved;
558 u16 family;
559};
560
561struct xfrm_migrate {
562 xfrm_address_t old_daddr;
563 xfrm_address_t old_saddr;
564 xfrm_address_t new_daddr;
565 xfrm_address_t new_saddr;
566 u8 proto;
567 u8 mode;
568 u16 reserved;
569 u32 reqid;
570 u16 old_family;
571 u16 new_family;
572};
573
574#define XFRM_KM_TIMEOUT 30
575/* what happened */
576#define XFRM_REPLAY_UPDATE XFRM_AE_CR
577#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
578
579/* default aevent timeout in units of 100ms */
580#define XFRM_AE_ETIME 10
581/* Async Event timer multiplier */
582#define XFRM_AE_ETH_M 10
583/* default seq threshold size */
584#define XFRM_AE_SEQT_SIZE 2
585
586struct xfrm_mgr {
587 struct list_head list;
588 int (*notify)(struct xfrm_state *x, const struct km_event *c);
589 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
590 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
591 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
592 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
593 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
594 int (*migrate)(const struct xfrm_selector *sel,
595 u8 dir, u8 type,
596 const struct xfrm_migrate *m,
597 int num_bundles,
598 const struct xfrm_kmaddress *k,
599 const struct xfrm_encap_tmpl *encap);
600 bool (*is_alive)(const struct km_event *c);
601};
602
603void xfrm_register_km(struct xfrm_mgr *km);
604void xfrm_unregister_km(struct xfrm_mgr *km);
605
606struct xfrm_tunnel_skb_cb {
607 union {
608 struct inet_skb_parm h4;
609 struct inet6_skb_parm h6;
610 } header;
611
612 union {
613 struct ip_tunnel *ip4;
614 struct ip6_tnl *ip6;
615 } tunnel;
616};
617
618#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
619
620/*
621 * This structure is used for the duration where packets are being
622 * transformed by IPsec. As soon as the packet leaves IPsec the
623 * area beyond the generic IP part may be overwritten.
624 */
625struct xfrm_skb_cb {
626 struct xfrm_tunnel_skb_cb header;
627
628 /* Sequence number for replay protection. */
629 union {
630 struct {
631 __u32 low;
632 __u32 hi;
633 } output;
634 struct {
635 __be32 low;
636 __be32 hi;
637 } input;
638 } seq;
639};
640
641#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
642
643/*
644 * This structure is used by the afinfo prepare_input/prepare_output functions
645 * to transmit header information to the mode input/output functions.
646 */
647struct xfrm_mode_skb_cb {
648 struct xfrm_tunnel_skb_cb header;
649
650 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
651 __be16 id;
652 __be16 frag_off;
653
654 /* IP header length (excluding options or extension headers). */
655 u8 ihl;
656
657 /* TOS for IPv4, class for IPv6. */
658 u8 tos;
659
660 /* TTL for IPv4, hop limitfor IPv6. */
661 u8 ttl;
662
663 /* Protocol for IPv4, NH for IPv6. */
664 u8 protocol;
665
666 /* Option length for IPv4, zero for IPv6. */
667 u8 optlen;
668
669 /* Used by IPv6 only, zero for IPv4. */
670 u8 flow_lbl[3];
671};
672
673#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
674
675/*
676 * This structure is used by the input processing to locate the SPI and
677 * related information.
678 */
679struct xfrm_spi_skb_cb {
680 struct xfrm_tunnel_skb_cb header;
681
682 unsigned int daddroff;
683 unsigned int family;
684 __be32 seq;
685};
686
687#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
688
689#ifdef CONFIG_AUDITSYSCALL
690static inline struct audit_buffer *xfrm_audit_start(const char *op)
691{
692 struct audit_buffer *audit_buf = NULL;
693
694 if (audit_enabled == AUDIT_OFF)
695 return NULL;
696 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
697 AUDIT_MAC_IPSEC_EVENT);
698 if (audit_buf == NULL)
699 return NULL;
700 audit_log_format(audit_buf, "op=%s", op);
701 return audit_buf;
702}
703
704static inline void xfrm_audit_helper_usrinfo(bool task_valid,
705 struct audit_buffer *audit_buf)
706{
707 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
708 audit_get_loginuid(current) :
709 INVALID_UID);
710 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
711 AUDIT_SID_UNSET;
712
713 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
714 audit_log_task_context(audit_buf);
715}
716
717void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
718void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
719 bool task_valid);
720void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
721void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
722void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
723 struct sk_buff *skb);
724void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
725 __be32 net_seq);
726void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
727void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
728 __be32 net_seq);
729void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
730 u8 proto);
731#else
732
733static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
734 bool task_valid)
735{
736}
737
738static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
739 bool task_valid)
740{
741}
742
743static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
744 bool task_valid)
745{
746}
747
748static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
749 bool task_valid)
750{
751}
752
753static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
754 struct sk_buff *skb)
755{
756}
757
758static inline void xfrm_audit_state_replay(struct xfrm_state *x,
759 struct sk_buff *skb, __be32 net_seq)
760{
761}
762
763static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
764 u16 family)
765{
766}
767
768static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
769 __be32 net_spi, __be32 net_seq)
770{
771}
772
773static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
774 struct sk_buff *skb, u8 proto)
775{
776}
777#endif /* CONFIG_AUDITSYSCALL */
778
779static inline void xfrm_pol_hold(struct xfrm_policy *policy)
780{
781 if (likely(policy != NULL))
782 refcount_inc(&policy->refcnt);
783}
784
785void xfrm_policy_destroy(struct xfrm_policy *policy);
786
787static inline void xfrm_pol_put(struct xfrm_policy *policy)
788{
789 if (refcount_dec_and_test(&policy->refcnt))
790 xfrm_policy_destroy(policy);
791}
792
793static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
794{
795 int i;
796 for (i = npols - 1; i >= 0; --i)
797 xfrm_pol_put(pols[i]);
798}
799
800void __xfrm_state_destroy(struct xfrm_state *, bool);
801
802static inline void __xfrm_state_put(struct xfrm_state *x)
803{
804 refcount_dec(&x->refcnt);
805}
806
807static inline void xfrm_state_put(struct xfrm_state *x)
808{
809 if (refcount_dec_and_test(&x->refcnt))
810 __xfrm_state_destroy(x, false);
811}
812
813static inline void xfrm_state_put_sync(struct xfrm_state *x)
814{
815 if (refcount_dec_and_test(&x->refcnt))
816 __xfrm_state_destroy(x, true);
817}
818
819static inline void xfrm_state_hold(struct xfrm_state *x)
820{
821 refcount_inc(&x->refcnt);
822}
823
824static inline bool addr_match(const void *token1, const void *token2,
825 unsigned int prefixlen)
826{
827 const __be32 *a1 = token1;
828 const __be32 *a2 = token2;
829 unsigned int pdw;
830 unsigned int pbi;
831
832 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
833 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
834
835 if (pdw)
836 if (memcmp(a1, a2, pdw << 2))
837 return false;
838
839 if (pbi) {
840 __be32 mask;
841
842 mask = htonl((0xffffffff) << (32 - pbi));
843
844 if ((a1[pdw] ^ a2[pdw]) & mask)
845 return false;
846 }
847
848 return true;
849}
850
851static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
852{
853 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
854 if (sizeof(long) == 4 && prefixlen == 0)
855 return true;
856 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
857}
858
859static __inline__
860__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
861{
862 __be16 port;
863 switch(fl->flowi_proto) {
864 case IPPROTO_TCP:
865 case IPPROTO_UDP:
866 case IPPROTO_UDPLITE:
867 case IPPROTO_SCTP:
868 port = uli->ports.sport;
869 break;
870 case IPPROTO_ICMP:
871 case IPPROTO_ICMPV6:
872 port = htons(uli->icmpt.type);
873 break;
874 case IPPROTO_MH:
875 port = htons(uli->mht.type);
876 break;
877 case IPPROTO_GRE:
878 port = htons(ntohl(uli->gre_key) >> 16);
879 break;
880 default:
881 port = 0; /*XXX*/
882 }
883 return port;
884}
885
886static __inline__
887__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
888{
889 __be16 port;
890 switch(fl->flowi_proto) {
891 case IPPROTO_TCP:
892 case IPPROTO_UDP:
893 case IPPROTO_UDPLITE:
894 case IPPROTO_SCTP:
895 port = uli->ports.dport;
896 break;
897 case IPPROTO_ICMP:
898 case IPPROTO_ICMPV6:
899 port = htons(uli->icmpt.code);
900 break;
901 case IPPROTO_GRE:
902 port = htons(ntohl(uli->gre_key) & 0xffff);
903 break;
904 default:
905 port = 0; /*XXX*/
906 }
907 return port;
908}
909
910bool xfrm_selector_match(const struct xfrm_selector *sel,
911 const struct flowi *fl, unsigned short family);
912
913#ifdef CONFIG_SECURITY_NETWORK_XFRM
914/* If neither has a context --> match
915 * Otherwise, both must have a context and the sids, doi, alg must match
916 */
917static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
918{
919 return ((!s1 && !s2) ||
920 (s1 && s2 &&
921 (s1->ctx_sid == s2->ctx_sid) &&
922 (s1->ctx_doi == s2->ctx_doi) &&
923 (s1->ctx_alg == s2->ctx_alg)));
924}
925#else
926static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
927{
928 return true;
929}
930#endif
931
932/* A struct encoding bundle of transformations to apply to some set of flow.
933 *
934 * xdst->child points to the next element of bundle.
935 * dst->xfrm points to an instanse of transformer.
936 *
937 * Due to unfortunate limitations of current routing cache, which we
938 * have no time to fix, it mirrors struct rtable and bound to the same
939 * routing key, including saddr,daddr. However, we can have many of
940 * bundles differing by session id. All the bundles grow from a parent
941 * policy rule.
942 */
943struct xfrm_dst {
944 union {
945 struct dst_entry dst;
946 struct rtable rt;
947 struct rt6_info rt6;
948 } u;
949 struct dst_entry *route;
950 struct dst_entry *child;
951 struct dst_entry *path;
952 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
953 int num_pols, num_xfrms;
954 u32 xfrm_genid;
955 u32 policy_genid;
956 u32 route_mtu_cached;
957 u32 child_mtu_cached;
958 u32 route_cookie;
959 u32 path_cookie;
960};
961
962static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
963{
964#ifdef CONFIG_XFRM
965 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
966 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
967
968 return xdst->path;
969 }
970#endif
971 return (struct dst_entry *) dst;
972}
973
974static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
975{
976#ifdef CONFIG_XFRM
977 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
978 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
979 return xdst->child;
980 }
981#endif
982 return NULL;
983}
984
985#ifdef CONFIG_XFRM
986static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
987{
988 xdst->child = child;
989}
990
991static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
992{
993 xfrm_pols_put(xdst->pols, xdst->num_pols);
994 dst_release(xdst->route);
995 if (likely(xdst->u.dst.xfrm))
996 xfrm_state_put(xdst->u.dst.xfrm);
997}
998#endif
999
1000void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1001
1002struct xfrm_if_parms {
1003 int link; /* ifindex of underlying L2 interface */
1004 u32 if_id; /* interface identifyer */
1005 bool collect_md;
1006};
1007
1008struct xfrm_if {
1009 struct xfrm_if __rcu *next; /* next interface in list */
1010 struct net_device *dev; /* virtual device associated with interface */
1011 struct net *net; /* netns for packet i/o */
1012 struct xfrm_if_parms p; /* interface parms */
1013
1014 struct gro_cells gro_cells;
1015};
1016
1017struct xfrm_offload {
1018 /* Output sequence number for replay protection on offloading. */
1019 struct {
1020 __u32 low;
1021 __u32 hi;
1022 } seq;
1023
1024 __u32 flags;
1025#define SA_DELETE_REQ 1
1026#define CRYPTO_DONE 2
1027#define CRYPTO_NEXT_DONE 4
1028#define CRYPTO_FALLBACK 8
1029#define XFRM_GSO_SEGMENT 16
1030#define XFRM_GRO 32
1031/* 64 is free */
1032#define XFRM_DEV_RESUME 128
1033#define XFRM_XMIT 256
1034
1035 __u32 status;
1036#define CRYPTO_SUCCESS 1
1037#define CRYPTO_GENERIC_ERROR 2
1038#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1039#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1040#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1041#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1042#define CRYPTO_INVALID_PACKET_SYNTAX 64
1043#define CRYPTO_INVALID_PROTOCOL 128
1044
1045 __u8 proto;
1046 __u8 inner_ipproto;
1047};
1048
1049struct sec_path {
1050 int len;
1051 int olen;
1052
1053 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1054 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1055};
1056
1057struct sec_path *secpath_set(struct sk_buff *skb);
1058
1059static inline void
1060secpath_reset(struct sk_buff *skb)
1061{
1062#ifdef CONFIG_XFRM
1063 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1064#endif
1065}
1066
1067static inline int
1068xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1069{
1070 switch (family) {
1071 case AF_INET:
1072 return addr->a4 == 0;
1073 case AF_INET6:
1074 return ipv6_addr_any(&addr->in6);
1075 }
1076 return 0;
1077}
1078
1079static inline int
1080__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1081{
1082 return (tmpl->saddr.a4 &&
1083 tmpl->saddr.a4 != x->props.saddr.a4);
1084}
1085
1086static inline int
1087__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1088{
1089 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1090 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1091}
1092
1093static inline int
1094xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1095{
1096 switch (family) {
1097 case AF_INET:
1098 return __xfrm4_state_addr_cmp(tmpl, x);
1099 case AF_INET6:
1100 return __xfrm6_state_addr_cmp(tmpl, x);
1101 }
1102 return !0;
1103}
1104
1105#ifdef CONFIG_XFRM
1106static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1107{
1108 struct sec_path *sp = skb_sec_path(skb);
1109
1110 return sp->xvec[sp->len - 1];
1111}
1112#endif
1113
1114static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1115{
1116#ifdef CONFIG_XFRM
1117 struct sec_path *sp = skb_sec_path(skb);
1118
1119 if (!sp || !sp->olen || sp->len != sp->olen)
1120 return NULL;
1121
1122 return &sp->ovec[sp->olen - 1];
1123#else
1124 return NULL;
1125#endif
1126}
1127
1128#ifdef CONFIG_XFRM
1129int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1130 unsigned short family);
1131
1132static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1133 int dir)
1134{
1135 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1136 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1137
1138 return false;
1139}
1140
1141static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1142 int dir, unsigned short family)
1143{
1144 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1145 /* same dst may be used for traffic originating from
1146 * devices with different policy settings.
1147 */
1148 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1149 }
1150 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1151}
1152
1153static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1154 struct sk_buff *skb,
1155 unsigned int family, int reverse)
1156{
1157 struct net *net = dev_net(skb->dev);
1158 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1159 struct xfrm_offload *xo = xfrm_offload(skb);
1160 struct xfrm_state *x;
1161
1162 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1163 return __xfrm_policy_check(sk, ndir, skb, family);
1164
1165 if (xo) {
1166 x = xfrm_input_state(skb);
1167 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1168 return (xo->flags & CRYPTO_DONE) &&
1169 (xo->status & CRYPTO_SUCCESS);
1170 }
1171
1172 return __xfrm_check_nopolicy(net, skb, dir) ||
1173 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1174 __xfrm_policy_check(sk, ndir, skb, family);
1175}
1176
1177static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1178{
1179 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1180}
1181
1182static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1183{
1184 return xfrm_policy_check(sk, dir, skb, AF_INET);
1185}
1186
1187static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1188{
1189 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1190}
1191
1192static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1193 struct sk_buff *skb)
1194{
1195 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1196}
1197
1198static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1199 struct sk_buff *skb)
1200{
1201 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1202}
1203
1204int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1205 unsigned int family, int reverse);
1206
1207static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1208 unsigned int family)
1209{
1210 return __xfrm_decode_session(skb, fl, family, 0);
1211}
1212
1213static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1214 struct flowi *fl,
1215 unsigned int family)
1216{
1217 return __xfrm_decode_session(skb, fl, family, 1);
1218}
1219
1220int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1221
1222static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1223{
1224 struct net *net = dev_net(skb->dev);
1225
1226 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1227 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1228 return true;
1229
1230 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1231 __xfrm_route_forward(skb, family);
1232}
1233
1234static inline int xfrm4_route_forward(struct sk_buff *skb)
1235{
1236 return xfrm_route_forward(skb, AF_INET);
1237}
1238
1239static inline int xfrm6_route_forward(struct sk_buff *skb)
1240{
1241 return xfrm_route_forward(skb, AF_INET6);
1242}
1243
1244int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1245
1246static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1247{
1248 if (!sk_fullsock(osk))
1249 return 0;
1250 sk->sk_policy[0] = NULL;
1251 sk->sk_policy[1] = NULL;
1252 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1253 return __xfrm_sk_clone_policy(sk, osk);
1254 return 0;
1255}
1256
1257int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1258
1259static inline void xfrm_sk_free_policy(struct sock *sk)
1260{
1261 struct xfrm_policy *pol;
1262
1263 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1264 if (unlikely(pol != NULL)) {
1265 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1266 sk->sk_policy[0] = NULL;
1267 }
1268 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1269 if (unlikely(pol != NULL)) {
1270 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1271 sk->sk_policy[1] = NULL;
1272 }
1273}
1274
1275#else
1276
1277static inline void xfrm_sk_free_policy(struct sock *sk) {}
1278static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1279static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1280static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1281static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1282{
1283 return 1;
1284}
1285static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1286{
1287 return 1;
1288}
1289static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1290{
1291 return 1;
1292}
1293static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1294 struct flowi *fl,
1295 unsigned int family)
1296{
1297 return -ENOSYS;
1298}
1299static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1300 struct sk_buff *skb)
1301{
1302 return 1;
1303}
1304static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1305 struct sk_buff *skb)
1306{
1307 return 1;
1308}
1309#endif
1310
1311static __inline__
1312xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1313{
1314 switch (family){
1315 case AF_INET:
1316 return (xfrm_address_t *)&fl->u.ip4.daddr;
1317 case AF_INET6:
1318 return (xfrm_address_t *)&fl->u.ip6.daddr;
1319 }
1320 return NULL;
1321}
1322
1323static __inline__
1324xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1325{
1326 switch (family){
1327 case AF_INET:
1328 return (xfrm_address_t *)&fl->u.ip4.saddr;
1329 case AF_INET6:
1330 return (xfrm_address_t *)&fl->u.ip6.saddr;
1331 }
1332 return NULL;
1333}
1334
1335static __inline__
1336void xfrm_flowi_addr_get(const struct flowi *fl,
1337 xfrm_address_t *saddr, xfrm_address_t *daddr,
1338 unsigned short family)
1339{
1340 switch(family) {
1341 case AF_INET:
1342 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1343 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1344 break;
1345 case AF_INET6:
1346 saddr->in6 = fl->u.ip6.saddr;
1347 daddr->in6 = fl->u.ip6.daddr;
1348 break;
1349 }
1350}
1351
1352static __inline__ int
1353__xfrm4_state_addr_check(const struct xfrm_state *x,
1354 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1355{
1356 if (daddr->a4 == x->id.daddr.a4 &&
1357 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1358 return 1;
1359 return 0;
1360}
1361
1362static __inline__ int
1363__xfrm6_state_addr_check(const struct xfrm_state *x,
1364 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1365{
1366 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1367 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1368 ipv6_addr_any((struct in6_addr *)saddr) ||
1369 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1370 return 1;
1371 return 0;
1372}
1373
1374static __inline__ int
1375xfrm_state_addr_check(const struct xfrm_state *x,
1376 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1377 unsigned short family)
1378{
1379 switch (family) {
1380 case AF_INET:
1381 return __xfrm4_state_addr_check(x, daddr, saddr);
1382 case AF_INET6:
1383 return __xfrm6_state_addr_check(x, daddr, saddr);
1384 }
1385 return 0;
1386}
1387
1388static __inline__ int
1389xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1390 unsigned short family)
1391{
1392 switch (family) {
1393 case AF_INET:
1394 return __xfrm4_state_addr_check(x,
1395 (const xfrm_address_t *)&fl->u.ip4.daddr,
1396 (const xfrm_address_t *)&fl->u.ip4.saddr);
1397 case AF_INET6:
1398 return __xfrm6_state_addr_check(x,
1399 (const xfrm_address_t *)&fl->u.ip6.daddr,
1400 (const xfrm_address_t *)&fl->u.ip6.saddr);
1401 }
1402 return 0;
1403}
1404
1405static inline int xfrm_state_kern(const struct xfrm_state *x)
1406{
1407 return atomic_read(&x->tunnel_users);
1408}
1409
1410static inline bool xfrm_id_proto_valid(u8 proto)
1411{
1412 switch (proto) {
1413 case IPPROTO_AH:
1414 case IPPROTO_ESP:
1415 case IPPROTO_COMP:
1416#if IS_ENABLED(CONFIG_IPV6)
1417 case IPPROTO_ROUTING:
1418 case IPPROTO_DSTOPTS:
1419#endif
1420 return true;
1421 default:
1422 return false;
1423 }
1424}
1425
1426/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1427static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1428{
1429 return (!userproto || proto == userproto ||
1430 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1431 proto == IPPROTO_ESP ||
1432 proto == IPPROTO_COMP)));
1433}
1434
1435/*
1436 * xfrm algorithm information
1437 */
1438struct xfrm_algo_aead_info {
1439 char *geniv;
1440 u16 icv_truncbits;
1441};
1442
1443struct xfrm_algo_auth_info {
1444 u16 icv_truncbits;
1445 u16 icv_fullbits;
1446};
1447
1448struct xfrm_algo_encr_info {
1449 char *geniv;
1450 u16 blockbits;
1451 u16 defkeybits;
1452};
1453
1454struct xfrm_algo_comp_info {
1455 u16 threshold;
1456};
1457
1458struct xfrm_algo_desc {
1459 char *name;
1460 char *compat;
1461 u8 available:1;
1462 u8 pfkey_supported:1;
1463 union {
1464 struct xfrm_algo_aead_info aead;
1465 struct xfrm_algo_auth_info auth;
1466 struct xfrm_algo_encr_info encr;
1467 struct xfrm_algo_comp_info comp;
1468 } uinfo;
1469 struct sadb_alg desc;
1470};
1471
1472/* XFRM protocol handlers. */
1473struct xfrm4_protocol {
1474 int (*handler)(struct sk_buff *skb);
1475 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1476 int encap_type);
1477 int (*cb_handler)(struct sk_buff *skb, int err);
1478 int (*err_handler)(struct sk_buff *skb, u32 info);
1479
1480 struct xfrm4_protocol __rcu *next;
1481 int priority;
1482};
1483
1484struct xfrm6_protocol {
1485 int (*handler)(struct sk_buff *skb);
1486 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1487 int encap_type);
1488 int (*cb_handler)(struct sk_buff *skb, int err);
1489 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1490 u8 type, u8 code, int offset, __be32 info);
1491
1492 struct xfrm6_protocol __rcu *next;
1493 int priority;
1494};
1495
1496/* XFRM tunnel handlers. */
1497struct xfrm_tunnel {
1498 int (*handler)(struct sk_buff *skb);
1499 int (*cb_handler)(struct sk_buff *skb, int err);
1500 int (*err_handler)(struct sk_buff *skb, u32 info);
1501
1502 struct xfrm_tunnel __rcu *next;
1503 int priority;
1504};
1505
1506struct xfrm6_tunnel {
1507 int (*handler)(struct sk_buff *skb);
1508 int (*cb_handler)(struct sk_buff *skb, int err);
1509 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1510 u8 type, u8 code, int offset, __be32 info);
1511 struct xfrm6_tunnel __rcu *next;
1512 int priority;
1513};
1514
1515void xfrm_init(void);
1516void xfrm4_init(void);
1517int xfrm_state_init(struct net *net);
1518void xfrm_state_fini(struct net *net);
1519void xfrm4_state_init(void);
1520void xfrm4_protocol_init(void);
1521#ifdef CONFIG_XFRM
1522int xfrm6_init(void);
1523void xfrm6_fini(void);
1524int xfrm6_state_init(void);
1525void xfrm6_state_fini(void);
1526int xfrm6_protocol_init(void);
1527void xfrm6_protocol_fini(void);
1528#else
1529static inline int xfrm6_init(void)
1530{
1531 return 0;
1532}
1533static inline void xfrm6_fini(void)
1534{
1535 ;
1536}
1537#endif
1538
1539#ifdef CONFIG_XFRM_STATISTICS
1540int xfrm_proc_init(struct net *net);
1541void xfrm_proc_fini(struct net *net);
1542#endif
1543
1544int xfrm_sysctl_init(struct net *net);
1545#ifdef CONFIG_SYSCTL
1546void xfrm_sysctl_fini(struct net *net);
1547#else
1548static inline void xfrm_sysctl_fini(struct net *net)
1549{
1550}
1551#endif
1552
1553void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1554 struct xfrm_address_filter *filter);
1555int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1556 int (*func)(struct xfrm_state *, int, void*), void *);
1557void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1558struct xfrm_state *xfrm_state_alloc(struct net *net);
1559void xfrm_state_free(struct xfrm_state *x);
1560struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1561 const xfrm_address_t *saddr,
1562 const struct flowi *fl,
1563 struct xfrm_tmpl *tmpl,
1564 struct xfrm_policy *pol, int *err,
1565 unsigned short family, u32 if_id);
1566struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1567 xfrm_address_t *daddr,
1568 xfrm_address_t *saddr,
1569 unsigned short family,
1570 u8 mode, u8 proto, u32 reqid);
1571struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1572 unsigned short family);
1573int xfrm_state_check_expire(struct xfrm_state *x);
1574#ifdef CONFIG_XFRM_OFFLOAD
1575static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x)
1576{
1577 struct xfrm_dev_offload *xdo = &x->xso;
1578 struct net_device *dev = xdo->dev;
1579
1580 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1581 return;
1582
1583 if (dev && dev->xfrmdev_ops &&
1584 dev->xfrmdev_ops->xdo_dev_state_update_curlft)
1585 dev->xfrmdev_ops->xdo_dev_state_update_curlft(x);
1586
1587}
1588#else
1589static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {}
1590#endif
1591void xfrm_state_insert(struct xfrm_state *x);
1592int xfrm_state_add(struct xfrm_state *x);
1593int xfrm_state_update(struct xfrm_state *x);
1594struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1595 const xfrm_address_t *daddr, __be32 spi,
1596 u8 proto, unsigned short family);
1597struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1598 const xfrm_address_t *daddr,
1599 const xfrm_address_t *saddr,
1600 u8 proto,
1601 unsigned short family);
1602#ifdef CONFIG_XFRM_SUB_POLICY
1603void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1604 unsigned short family);
1605void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1606 unsigned short family);
1607#else
1608static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1609 int n, unsigned short family)
1610{
1611}
1612
1613static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1614 int n, unsigned short family)
1615{
1616}
1617#endif
1618
1619struct xfrmk_sadinfo {
1620 u32 sadhcnt; /* current hash bkts */
1621 u32 sadhmcnt; /* max allowed hash bkts */
1622 u32 sadcnt; /* current running count */
1623};
1624
1625struct xfrmk_spdinfo {
1626 u32 incnt;
1627 u32 outcnt;
1628 u32 fwdcnt;
1629 u32 inscnt;
1630 u32 outscnt;
1631 u32 fwdscnt;
1632 u32 spdhcnt;
1633 u32 spdhmcnt;
1634};
1635
1636struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1637int xfrm_state_delete(struct xfrm_state *x);
1638int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1639int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1640int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1641 bool task_valid);
1642void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1643void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1644u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1645int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1646u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1647int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1648 struct netlink_ext_ack *extack);
1649int xfrm_init_state(struct xfrm_state *x);
1650int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1651int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1652int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1653 int (*finish)(struct net *, struct sock *,
1654 struct sk_buff *));
1655int xfrm_trans_queue(struct sk_buff *skb,
1656 int (*finish)(struct net *, struct sock *,
1657 struct sk_buff *));
1658int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1659int xfrm_output(struct sock *sk, struct sk_buff *skb);
1660
1661#if IS_ENABLED(CONFIG_NET_PKTGEN)
1662int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1663#endif
1664
1665void xfrm_local_error(struct sk_buff *skb, int mtu);
1666int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1667int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1668 int encap_type);
1669int xfrm4_transport_finish(struct sk_buff *skb, int async);
1670int xfrm4_rcv(struct sk_buff *skb);
1671
1672static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1673{
1674 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1675 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1676 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1677 return xfrm_input(skb, nexthdr, spi, 0);
1678}
1679
1680int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1681int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1682int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1683int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1684int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1685void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1686int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1687int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1688 struct ip6_tnl *t);
1689int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1690 int encap_type);
1691int xfrm6_transport_finish(struct sk_buff *skb, int async);
1692int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1693int xfrm6_rcv(struct sk_buff *skb);
1694int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1695 xfrm_address_t *saddr, u8 proto);
1696void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1697int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1698int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1699int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1700int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1701__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1702__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1703int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1704
1705#ifdef CONFIG_XFRM
1706void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1707int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1708int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1709int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1710 int optlen);
1711#else
1712static inline int xfrm_user_policy(struct sock *sk, int optname,
1713 sockptr_t optval, int optlen)
1714{
1715 return -ENOPROTOOPT;
1716}
1717#endif
1718
1719struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1720 const xfrm_address_t *saddr,
1721 const xfrm_address_t *daddr,
1722 int family, u32 mark);
1723
1724struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1725
1726void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1727int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1728 int (*func)(struct xfrm_policy *, int, int, void*),
1729 void *);
1730void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1731int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1732struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1733 const struct xfrm_mark *mark,
1734 u32 if_id, u8 type, int dir,
1735 struct xfrm_selector *sel,
1736 struct xfrm_sec_ctx *ctx, int delete,
1737 int *err);
1738struct xfrm_policy *xfrm_policy_byid(struct net *net,
1739 const struct xfrm_mark *mark, u32 if_id,
1740 u8 type, int dir, u32 id, int delete,
1741 int *err);
1742int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1743void xfrm_policy_hash_rebuild(struct net *net);
1744u32 xfrm_get_acqseq(void);
1745int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1746int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1747 struct netlink_ext_ack *extack);
1748struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1749 u8 mode, u32 reqid, u32 if_id, u8 proto,
1750 const xfrm_address_t *daddr,
1751 const xfrm_address_t *saddr, int create,
1752 unsigned short family);
1753int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1754
1755#ifdef CONFIG_XFRM_MIGRATE
1756int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1757 const struct xfrm_migrate *m, int num_bundles,
1758 const struct xfrm_kmaddress *k,
1759 const struct xfrm_encap_tmpl *encap);
1760struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1761 u32 if_id);
1762struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1763 struct xfrm_migrate *m,
1764 struct xfrm_encap_tmpl *encap);
1765int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1766 struct xfrm_migrate *m, int num_bundles,
1767 struct xfrm_kmaddress *k, struct net *net,
1768 struct xfrm_encap_tmpl *encap, u32 if_id,
1769 struct netlink_ext_ack *extack);
1770#endif
1771
1772int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1773void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1774int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1775 xfrm_address_t *addr);
1776
1777void xfrm_input_init(void);
1778int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1779
1780void xfrm_probe_algs(void);
1781int xfrm_count_pfkey_auth_supported(void);
1782int xfrm_count_pfkey_enc_supported(void);
1783struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1784struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1785struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1786struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1787struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1788struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1789struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1790struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1791struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1792 int probe);
1793
1794static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1795 const xfrm_address_t *b)
1796{
1797 return ipv6_addr_equal((const struct in6_addr *)a,
1798 (const struct in6_addr *)b);
1799}
1800
1801static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1802 const xfrm_address_t *b,
1803 sa_family_t family)
1804{
1805 switch (family) {
1806 default:
1807 case AF_INET:
1808 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1809 case AF_INET6:
1810 return xfrm6_addr_equal(a, b);
1811 }
1812}
1813
1814static inline int xfrm_policy_id2dir(u32 index)
1815{
1816 return index & 7;
1817}
1818
1819#ifdef CONFIG_XFRM
1820void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1821int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1822void xfrm_replay_notify(struct xfrm_state *x, int event);
1823int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1824int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1825
1826static inline int xfrm_aevent_is_on(struct net *net)
1827{
1828 struct sock *nlsk;
1829 int ret = 0;
1830
1831 rcu_read_lock();
1832 nlsk = rcu_dereference(net->xfrm.nlsk);
1833 if (nlsk)
1834 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1835 rcu_read_unlock();
1836 return ret;
1837}
1838
1839static inline int xfrm_acquire_is_on(struct net *net)
1840{
1841 struct sock *nlsk;
1842 int ret = 0;
1843
1844 rcu_read_lock();
1845 nlsk = rcu_dereference(net->xfrm.nlsk);
1846 if (nlsk)
1847 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1848 rcu_read_unlock();
1849
1850 return ret;
1851}
1852#endif
1853
1854static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1855{
1856 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1857}
1858
1859static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1860{
1861 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1862}
1863
1864static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1865{
1866 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1867}
1868
1869static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1870{
1871 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1872}
1873
1874#ifdef CONFIG_XFRM_MIGRATE
1875static inline int xfrm_replay_clone(struct xfrm_state *x,
1876 struct xfrm_state *orig)
1877{
1878
1879 x->replay_esn = kmemdup(orig->replay_esn,
1880 xfrm_replay_state_esn_len(orig->replay_esn),
1881 GFP_KERNEL);
1882 if (!x->replay_esn)
1883 return -ENOMEM;
1884 x->preplay_esn = kmemdup(orig->preplay_esn,
1885 xfrm_replay_state_esn_len(orig->preplay_esn),
1886 GFP_KERNEL);
1887 if (!x->preplay_esn)
1888 return -ENOMEM;
1889
1890 return 0;
1891}
1892
1893static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1894{
1895 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1896}
1897
1898
1899static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1900{
1901 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1902}
1903
1904static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1905{
1906 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1907}
1908
1909static inline void xfrm_states_put(struct xfrm_state **states, int n)
1910{
1911 int i;
1912 for (i = 0; i < n; i++)
1913 xfrm_state_put(*(states + i));
1914}
1915
1916static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1917{
1918 int i;
1919 for (i = 0; i < n; i++)
1920 xfrm_state_delete(*(states + i));
1921}
1922#endif
1923
1924void __init xfrm_dev_init(void);
1925
1926#ifdef CONFIG_XFRM_OFFLOAD
1927void xfrm_dev_resume(struct sk_buff *skb);
1928void xfrm_dev_backlog(struct softnet_data *sd);
1929struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1930int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1931 struct xfrm_user_offload *xuo,
1932 struct netlink_ext_ack *extack);
1933int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1934 struct xfrm_user_offload *xuo, u8 dir,
1935 struct netlink_ext_ack *extack);
1936bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1937
1938static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1939{
1940 struct xfrm_dev_offload *xso = &x->xso;
1941
1942 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1943 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1944}
1945
1946static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1947{
1948 struct xfrm_state *x = dst->xfrm;
1949 struct xfrm_dst *xdst;
1950
1951 if (!x || !x->type_offload)
1952 return false;
1953
1954 xdst = (struct xfrm_dst *) dst;
1955 if (!x->xso.offload_handle && !xdst->child->xfrm)
1956 return true;
1957 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1958 !xdst->child->xfrm)
1959 return true;
1960
1961 return false;
1962}
1963
1964static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1965{
1966 struct xfrm_dev_offload *xso = &x->xso;
1967
1968 if (xso->dev)
1969 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1970}
1971
1972static inline void xfrm_dev_state_free(struct xfrm_state *x)
1973{
1974 struct xfrm_dev_offload *xso = &x->xso;
1975 struct net_device *dev = xso->dev;
1976
1977 if (dev && dev->xfrmdev_ops) {
1978 if (dev->xfrmdev_ops->xdo_dev_state_free)
1979 dev->xfrmdev_ops->xdo_dev_state_free(x);
1980 xso->dev = NULL;
1981 netdev_put(dev, &xso->dev_tracker);
1982 }
1983}
1984
1985static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1986{
1987 struct xfrm_dev_offload *xdo = &x->xdo;
1988 struct net_device *dev = xdo->dev;
1989
1990 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
1991 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
1992}
1993
1994static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
1995{
1996 struct xfrm_dev_offload *xdo = &x->xdo;
1997 struct net_device *dev = xdo->dev;
1998
1999 if (dev && dev->xfrmdev_ops) {
2000 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2001 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2002 xdo->dev = NULL;
2003 netdev_put(dev, &xdo->dev_tracker);
2004 }
2005}
2006#else
2007static inline void xfrm_dev_resume(struct sk_buff *skb)
2008{
2009}
2010
2011static inline void xfrm_dev_backlog(struct softnet_data *sd)
2012{
2013}
2014
2015static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2016{
2017 return skb;
2018}
2019
2020static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2021{
2022 return 0;
2023}
2024
2025static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2026{
2027}
2028
2029static inline void xfrm_dev_state_free(struct xfrm_state *x)
2030{
2031}
2032
2033static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2034 struct xfrm_user_offload *xuo, u8 dir,
2035 struct netlink_ext_ack *extack)
2036{
2037 return 0;
2038}
2039
2040static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2041{
2042}
2043
2044static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2045{
2046}
2047
2048static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2049{
2050 return false;
2051}
2052
2053static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2054{
2055}
2056
2057static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2058{
2059 return false;
2060}
2061#endif
2062
2063static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2064{
2065 if (attrs[XFRMA_MARK])
2066 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2067 else
2068 m->v = m->m = 0;
2069
2070 return m->v & m->m;
2071}
2072
2073static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2074{
2075 int ret = 0;
2076
2077 if (m->m | m->v)
2078 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2079 return ret;
2080}
2081
2082static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2083{
2084 struct xfrm_mark *m = &x->props.smark;
2085
2086 return (m->v & m->m) | (mark & ~m->m);
2087}
2088
2089static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2090{
2091 int ret = 0;
2092
2093 if (if_id)
2094 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2095 return ret;
2096}
2097
2098static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2099 unsigned int family)
2100{
2101 bool tunnel = false;
2102
2103 switch(family) {
2104 case AF_INET:
2105 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2106 tunnel = true;
2107 break;
2108 case AF_INET6:
2109 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2110 tunnel = true;
2111 break;
2112 }
2113 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2114 return -EINVAL;
2115
2116 return 0;
2117}
2118
2119extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2120extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2121
2122struct xfrm_translator {
2123 /* Allocate frag_list and put compat translation there */
2124 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2125
2126 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2127 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2128 int maxtype, const struct nla_policy *policy,
2129 struct netlink_ext_ack *extack);
2130
2131 /* Translate 32-bit user_policy from sockptr */
2132 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2133
2134 struct module *owner;
2135};
2136
2137#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2138extern int xfrm_register_translator(struct xfrm_translator *xtr);
2139extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2140extern struct xfrm_translator *xfrm_get_translator(void);
2141extern void xfrm_put_translator(struct xfrm_translator *xtr);
2142#else
2143static inline struct xfrm_translator *xfrm_get_translator(void)
2144{
2145 return NULL;
2146}
2147static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2148{
2149}
2150#endif
2151
2152#if IS_ENABLED(CONFIG_IPV6)
2153static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2154{
2155 int proto;
2156
2157 if (!sk || sk->sk_family != AF_INET6)
2158 return false;
2159
2160 proto = sk->sk_protocol;
2161 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2162 return inet6_sk(sk)->dontfrag;
2163
2164 return false;
2165}
2166#endif
2167
2168#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2169 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2170
2171extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2172
2173int register_xfrm_interface_bpf(void);
2174
2175#else
2176
2177static inline int register_xfrm_interface_bpf(void)
2178{
2179 return 0;
2180}
2181
2182#endif
2183
2184#endif /* _NET_XFRM_H */