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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_XFRM_H
3#define _NET_XFRM_H
4
5#include <linux/compiler.h>
6#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/pfkeyv2.h>
12#include <linux/ipsec.h>
13#include <linux/in6.h>
14#include <linux/mutex.h>
15#include <linux/audit.h>
16#include <linux/slab.h>
17#include <linux/refcount.h>
18
19#include <net/sock.h>
20#include <net/dst.h>
21#include <net/ip.h>
22#include <net/route.h>
23#include <net/ipv6.h>
24#include <net/ip6_fib.h>
25#include <net/flow.h>
26#include <net/gro_cells.h>
27
28#include <linux/interrupt.h>
29
30#ifdef CONFIG_XFRM_STATISTICS
31#include <net/snmp.h>
32#endif
33
34#define XFRM_PROTO_ESP 50
35#define XFRM_PROTO_AH 51
36#define XFRM_PROTO_COMP 108
37#define XFRM_PROTO_IPIP 4
38#define XFRM_PROTO_IPV6 41
39#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
40#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
41
42#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
43#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
44#define MODULE_ALIAS_XFRM_MODE(family, encap) \
45 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
46#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
47 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
48#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
49 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
50
51#ifdef CONFIG_XFRM_STATISTICS
52#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
53#else
54#define XFRM_INC_STATS(net, field) ((void)(net))
55#endif
56
57
58/* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 u8 dying;
123 u8 proto;
124 u32 seq;
125 struct xfrm_address_filter *filter;
126};
127
128struct xfrm_state_offload {
129 struct net_device *dev;
130 unsigned long offload_handle;
131 unsigned int num_exthdrs;
132 u8 flags;
133};
134
135struct xfrm_mode {
136 u8 encap;
137 u8 family;
138 u8 flags;
139};
140
141/* Flags for xfrm_mode. */
142enum {
143 XFRM_MODE_FLAG_TUNNEL = 1,
144};
145
146/* Full description of state of transformer. */
147struct xfrm_state {
148 possible_net_t xs_net;
149 union {
150 struct hlist_node gclist;
151 struct hlist_node bydst;
152 };
153 struct hlist_node bysrc;
154 struct hlist_node byspi;
155
156 refcount_t refcnt;
157 spinlock_t lock;
158
159 struct xfrm_id id;
160 struct xfrm_selector sel;
161 struct xfrm_mark mark;
162 u32 if_id;
163 u32 tfcpad;
164
165 u32 genid;
166
167 /* Key manager bits */
168 struct xfrm_state_walk km;
169
170 /* Parameters of this state. */
171 struct {
172 u32 reqid;
173 u8 mode;
174 u8 replay_window;
175 u8 aalgo, ealgo, calgo;
176 u8 flags;
177 u16 family;
178 xfrm_address_t saddr;
179 int header_len;
180 int trailer_len;
181 u32 extra_flags;
182 struct xfrm_mark smark;
183 } props;
184
185 struct xfrm_lifetime_cfg lft;
186
187 /* Data for transformer */
188 struct xfrm_algo_auth *aalg;
189 struct xfrm_algo *ealg;
190 struct xfrm_algo *calg;
191 struct xfrm_algo_aead *aead;
192 const char *geniv;
193
194 /* Data for encapsulator */
195 struct xfrm_encap_tmpl *encap;
196
197 /* Data for care-of address */
198 xfrm_address_t *coaddr;
199
200 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
201 struct xfrm_state *tunnel;
202
203 /* If a tunnel, number of users + 1 */
204 atomic_t tunnel_users;
205
206 /* State for replay detection */
207 struct xfrm_replay_state replay;
208 struct xfrm_replay_state_esn *replay_esn;
209
210 /* Replay detection state at the time we sent the last notification */
211 struct xfrm_replay_state preplay;
212 struct xfrm_replay_state_esn *preplay_esn;
213
214 /* The functions for replay detection. */
215 const struct xfrm_replay *repl;
216
217 /* internal flag that only holds state for delayed aevent at the
218 * moment
219 */
220 u32 xflags;
221
222 /* Replay detection notification settings */
223 u32 replay_maxage;
224 u32 replay_maxdiff;
225
226 /* Replay detection notification timer */
227 struct timer_list rtimer;
228
229 /* Statistics */
230 struct xfrm_stats stats;
231
232 struct xfrm_lifetime_cur curlft;
233 struct hrtimer mtimer;
234
235 struct xfrm_state_offload xso;
236
237 /* used to fix curlft->add_time when changing date */
238 long saved_tmo;
239
240 /* Last used time */
241 time64_t lastused;
242
243 struct page_frag xfrag;
244
245 /* Reference to data common to all the instances of this
246 * transformer. */
247 const struct xfrm_type *type;
248 struct xfrm_mode inner_mode;
249 struct xfrm_mode inner_mode_iaf;
250 struct xfrm_mode outer_mode;
251
252 const struct xfrm_type_offload *type_offload;
253
254 /* Security context */
255 struct xfrm_sec_ctx *security;
256
257 /* Private data of this transformer, format is opaque,
258 * interpreted by xfrm_type methods. */
259 void *data;
260};
261
262static inline struct net *xs_net(struct xfrm_state *x)
263{
264 return read_pnet(&x->xs_net);
265}
266
267/* xflags - make enum if more show up */
268#define XFRM_TIME_DEFER 1
269#define XFRM_SOFT_EXPIRE 2
270
271enum {
272 XFRM_STATE_VOID,
273 XFRM_STATE_ACQ,
274 XFRM_STATE_VALID,
275 XFRM_STATE_ERROR,
276 XFRM_STATE_EXPIRED,
277 XFRM_STATE_DEAD
278};
279
280/* callback structure passed from either netlink or pfkey */
281struct km_event {
282 union {
283 u32 hard;
284 u32 proto;
285 u32 byid;
286 u32 aevent;
287 u32 type;
288 } data;
289
290 u32 seq;
291 u32 portid;
292 u32 event;
293 struct net *net;
294};
295
296struct xfrm_replay {
297 void (*advance)(struct xfrm_state *x, __be32 net_seq);
298 int (*check)(struct xfrm_state *x,
299 struct sk_buff *skb,
300 __be32 net_seq);
301 int (*recheck)(struct xfrm_state *x,
302 struct sk_buff *skb,
303 __be32 net_seq);
304 void (*notify)(struct xfrm_state *x, int event);
305 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
306};
307
308struct xfrm_if_cb {
309 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
310 unsigned short family);
311};
312
313void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
314void xfrm_if_unregister_cb(void);
315
316struct net_device;
317struct xfrm_type;
318struct xfrm_dst;
319struct xfrm_policy_afinfo {
320 struct dst_ops *dst_ops;
321 struct dst_entry *(*dst_lookup)(struct net *net,
322 int tos, int oif,
323 const xfrm_address_t *saddr,
324 const xfrm_address_t *daddr,
325 u32 mark);
326 int (*get_saddr)(struct net *net, int oif,
327 xfrm_address_t *saddr,
328 xfrm_address_t *daddr,
329 u32 mark);
330 int (*fill_dst)(struct xfrm_dst *xdst,
331 struct net_device *dev,
332 const struct flowi *fl);
333 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
334};
335
336int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
337void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
338void km_policy_notify(struct xfrm_policy *xp, int dir,
339 const struct km_event *c);
340void km_state_notify(struct xfrm_state *x, const struct km_event *c);
341
342struct xfrm_tmpl;
343int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
344 struct xfrm_policy *pol);
345void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
346int __xfrm_state_delete(struct xfrm_state *x);
347
348struct xfrm_state_afinfo {
349 u8 family;
350 u8 proto;
351
352 const struct xfrm_type_offload *type_offload_esp;
353
354 const struct xfrm_type *type_esp;
355 const struct xfrm_type *type_ipip;
356 const struct xfrm_type *type_ipip6;
357 const struct xfrm_type *type_comp;
358 const struct xfrm_type *type_ah;
359 const struct xfrm_type *type_routing;
360 const struct xfrm_type *type_dstopts;
361
362 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
363 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
364 int (*extract_input)(struct xfrm_state *x,
365 struct sk_buff *skb);
366 int (*extract_output)(struct xfrm_state *x,
367 struct sk_buff *skb);
368 int (*transport_finish)(struct sk_buff *skb,
369 int async);
370 void (*local_error)(struct sk_buff *skb, u32 mtu);
371};
372
373int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
374int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
375struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
376struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
377
378struct xfrm_input_afinfo {
379 unsigned int family;
380 int (*callback)(struct sk_buff *skb, u8 protocol,
381 int err);
382};
383
384int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
385int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
386
387void xfrm_flush_gc(void);
388void xfrm_state_delete_tunnel(struct xfrm_state *x);
389
390struct xfrm_type {
391 char *description;
392 struct module *owner;
393 u8 proto;
394 u8 flags;
395#define XFRM_TYPE_NON_FRAGMENT 1
396#define XFRM_TYPE_REPLAY_PROT 2
397#define XFRM_TYPE_LOCAL_COADDR 4
398#define XFRM_TYPE_REMOTE_COADDR 8
399
400 int (*init_state)(struct xfrm_state *x);
401 void (*destructor)(struct xfrm_state *);
402 int (*input)(struct xfrm_state *, struct sk_buff *skb);
403 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
404 int (*reject)(struct xfrm_state *, struct sk_buff *,
405 const struct flowi *);
406 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
407};
408
409int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
410void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
411
412struct xfrm_type_offload {
413 char *description;
414 struct module *owner;
415 u8 proto;
416 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
417 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
418 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
419};
420
421int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
422void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
423
424static inline int xfrm_af2proto(unsigned int family)
425{
426 switch(family) {
427 case AF_INET:
428 return IPPROTO_IPIP;
429 case AF_INET6:
430 return IPPROTO_IPV6;
431 default:
432 return 0;
433 }
434}
435
436static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
437{
438 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
439 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
440 return &x->inner_mode;
441 else
442 return &x->inner_mode_iaf;
443}
444
445struct xfrm_tmpl {
446/* id in template is interpreted as:
447 * daddr - destination of tunnel, may be zero for transport mode.
448 * spi - zero to acquire spi. Not zero if spi is static, then
449 * daddr must be fixed too.
450 * proto - AH/ESP/IPCOMP
451 */
452 struct xfrm_id id;
453
454/* Source address of tunnel. Ignored, if it is not a tunnel. */
455 xfrm_address_t saddr;
456
457 unsigned short encap_family;
458
459 u32 reqid;
460
461/* Mode: transport, tunnel etc. */
462 u8 mode;
463
464/* Sharing mode: unique, this session only, this user only etc. */
465 u8 share;
466
467/* May skip this transfomration if no SA is found */
468 u8 optional;
469
470/* Skip aalgos/ealgos/calgos checks. */
471 u8 allalgs;
472
473/* Bit mask of algos allowed for acquisition */
474 u32 aalgos;
475 u32 ealgos;
476 u32 calgos;
477};
478
479#define XFRM_MAX_DEPTH 6
480#define XFRM_MAX_OFFLOAD_DEPTH 1
481
482struct xfrm_policy_walk_entry {
483 struct list_head all;
484 u8 dead;
485};
486
487struct xfrm_policy_walk {
488 struct xfrm_policy_walk_entry walk;
489 u8 type;
490 u32 seq;
491};
492
493struct xfrm_policy_queue {
494 struct sk_buff_head hold_queue;
495 struct timer_list hold_timer;
496 unsigned long timeout;
497};
498
499struct xfrm_policy {
500 possible_net_t xp_net;
501 struct hlist_node bydst;
502 struct hlist_node byidx;
503
504 /* This lock only affects elements except for entry. */
505 rwlock_t lock;
506 refcount_t refcnt;
507 u32 pos;
508 struct timer_list timer;
509
510 atomic_t genid;
511 u32 priority;
512 u32 index;
513 u32 if_id;
514 struct xfrm_mark mark;
515 struct xfrm_selector selector;
516 struct xfrm_lifetime_cfg lft;
517 struct xfrm_lifetime_cur curlft;
518 struct xfrm_policy_walk_entry walk;
519 struct xfrm_policy_queue polq;
520 bool bydst_reinsert;
521 u8 type;
522 u8 action;
523 u8 flags;
524 u8 xfrm_nr;
525 u16 family;
526 struct xfrm_sec_ctx *security;
527 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
528 struct hlist_node bydst_inexact_list;
529 struct rcu_head rcu;
530};
531
532static inline struct net *xp_net(const struct xfrm_policy *xp)
533{
534 return read_pnet(&xp->xp_net);
535}
536
537struct xfrm_kmaddress {
538 xfrm_address_t local;
539 xfrm_address_t remote;
540 u32 reserved;
541 u16 family;
542};
543
544struct xfrm_migrate {
545 xfrm_address_t old_daddr;
546 xfrm_address_t old_saddr;
547 xfrm_address_t new_daddr;
548 xfrm_address_t new_saddr;
549 u8 proto;
550 u8 mode;
551 u16 reserved;
552 u32 reqid;
553 u16 old_family;
554 u16 new_family;
555};
556
557#define XFRM_KM_TIMEOUT 30
558/* what happened */
559#define XFRM_REPLAY_UPDATE XFRM_AE_CR
560#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
561
562/* default aevent timeout in units of 100ms */
563#define XFRM_AE_ETIME 10
564/* Async Event timer multiplier */
565#define XFRM_AE_ETH_M 10
566/* default seq threshold size */
567#define XFRM_AE_SEQT_SIZE 2
568
569struct xfrm_mgr {
570 struct list_head list;
571 int (*notify)(struct xfrm_state *x, const struct km_event *c);
572 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
573 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
574 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
575 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
576 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
577 int (*migrate)(const struct xfrm_selector *sel,
578 u8 dir, u8 type,
579 const struct xfrm_migrate *m,
580 int num_bundles,
581 const struct xfrm_kmaddress *k,
582 const struct xfrm_encap_tmpl *encap);
583 bool (*is_alive)(const struct km_event *c);
584};
585
586int xfrm_register_km(struct xfrm_mgr *km);
587int xfrm_unregister_km(struct xfrm_mgr *km);
588
589struct xfrm_tunnel_skb_cb {
590 union {
591 struct inet_skb_parm h4;
592 struct inet6_skb_parm h6;
593 } header;
594
595 union {
596 struct ip_tunnel *ip4;
597 struct ip6_tnl *ip6;
598 } tunnel;
599};
600
601#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
602
603/*
604 * This structure is used for the duration where packets are being
605 * transformed by IPsec. As soon as the packet leaves IPsec the
606 * area beyond the generic IP part may be overwritten.
607 */
608struct xfrm_skb_cb {
609 struct xfrm_tunnel_skb_cb header;
610
611 /* Sequence number for replay protection. */
612 union {
613 struct {
614 __u32 low;
615 __u32 hi;
616 } output;
617 struct {
618 __be32 low;
619 __be32 hi;
620 } input;
621 } seq;
622};
623
624#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
625
626/*
627 * This structure is used by the afinfo prepare_input/prepare_output functions
628 * to transmit header information to the mode input/output functions.
629 */
630struct xfrm_mode_skb_cb {
631 struct xfrm_tunnel_skb_cb header;
632
633 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
634 __be16 id;
635 __be16 frag_off;
636
637 /* IP header length (excluding options or extension headers). */
638 u8 ihl;
639
640 /* TOS for IPv4, class for IPv6. */
641 u8 tos;
642
643 /* TTL for IPv4, hop limitfor IPv6. */
644 u8 ttl;
645
646 /* Protocol for IPv4, NH for IPv6. */
647 u8 protocol;
648
649 /* Option length for IPv4, zero for IPv6. */
650 u8 optlen;
651
652 /* Used by IPv6 only, zero for IPv4. */
653 u8 flow_lbl[3];
654};
655
656#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
657
658/*
659 * This structure is used by the input processing to locate the SPI and
660 * related information.
661 */
662struct xfrm_spi_skb_cb {
663 struct xfrm_tunnel_skb_cb header;
664
665 unsigned int daddroff;
666 unsigned int family;
667 __be32 seq;
668};
669
670#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
671
672#ifdef CONFIG_AUDITSYSCALL
673static inline struct audit_buffer *xfrm_audit_start(const char *op)
674{
675 struct audit_buffer *audit_buf = NULL;
676
677 if (audit_enabled == AUDIT_OFF)
678 return NULL;
679 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
680 AUDIT_MAC_IPSEC_EVENT);
681 if (audit_buf == NULL)
682 return NULL;
683 audit_log_format(audit_buf, "op=%s", op);
684 return audit_buf;
685}
686
687static inline void xfrm_audit_helper_usrinfo(bool task_valid,
688 struct audit_buffer *audit_buf)
689{
690 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
691 audit_get_loginuid(current) :
692 INVALID_UID);
693 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
694 AUDIT_SID_UNSET;
695
696 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
697 audit_log_task_context(audit_buf);
698}
699
700void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
701void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
702 bool task_valid);
703void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
704void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
705void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
706 struct sk_buff *skb);
707void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
708 __be32 net_seq);
709void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
710void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
711 __be32 net_seq);
712void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
713 u8 proto);
714#else
715
716static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
717 bool task_valid)
718{
719}
720
721static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
722 bool task_valid)
723{
724}
725
726static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
727 bool task_valid)
728{
729}
730
731static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
732 bool task_valid)
733{
734}
735
736static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
737 struct sk_buff *skb)
738{
739}
740
741static inline void xfrm_audit_state_replay(struct xfrm_state *x,
742 struct sk_buff *skb, __be32 net_seq)
743{
744}
745
746static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
747 u16 family)
748{
749}
750
751static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
752 __be32 net_spi, __be32 net_seq)
753{
754}
755
756static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
757 struct sk_buff *skb, u8 proto)
758{
759}
760#endif /* CONFIG_AUDITSYSCALL */
761
762static inline void xfrm_pol_hold(struct xfrm_policy *policy)
763{
764 if (likely(policy != NULL))
765 refcount_inc(&policy->refcnt);
766}
767
768void xfrm_policy_destroy(struct xfrm_policy *policy);
769
770static inline void xfrm_pol_put(struct xfrm_policy *policy)
771{
772 if (refcount_dec_and_test(&policy->refcnt))
773 xfrm_policy_destroy(policy);
774}
775
776static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
777{
778 int i;
779 for (i = npols - 1; i >= 0; --i)
780 xfrm_pol_put(pols[i]);
781}
782
783void __xfrm_state_destroy(struct xfrm_state *, bool);
784
785static inline void __xfrm_state_put(struct xfrm_state *x)
786{
787 refcount_dec(&x->refcnt);
788}
789
790static inline void xfrm_state_put(struct xfrm_state *x)
791{
792 if (refcount_dec_and_test(&x->refcnt))
793 __xfrm_state_destroy(x, false);
794}
795
796static inline void xfrm_state_put_sync(struct xfrm_state *x)
797{
798 if (refcount_dec_and_test(&x->refcnt))
799 __xfrm_state_destroy(x, true);
800}
801
802static inline void xfrm_state_hold(struct xfrm_state *x)
803{
804 refcount_inc(&x->refcnt);
805}
806
807static inline bool addr_match(const void *token1, const void *token2,
808 unsigned int prefixlen)
809{
810 const __be32 *a1 = token1;
811 const __be32 *a2 = token2;
812 unsigned int pdw;
813 unsigned int pbi;
814
815 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
816 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
817
818 if (pdw)
819 if (memcmp(a1, a2, pdw << 2))
820 return false;
821
822 if (pbi) {
823 __be32 mask;
824
825 mask = htonl((0xffffffff) << (32 - pbi));
826
827 if ((a1[pdw] ^ a2[pdw]) & mask)
828 return false;
829 }
830
831 return true;
832}
833
834static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
835{
836 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
837 if (sizeof(long) == 4 && prefixlen == 0)
838 return true;
839 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
840}
841
842static __inline__
843__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
844{
845 __be16 port;
846 switch(fl->flowi_proto) {
847 case IPPROTO_TCP:
848 case IPPROTO_UDP:
849 case IPPROTO_UDPLITE:
850 case IPPROTO_SCTP:
851 port = uli->ports.sport;
852 break;
853 case IPPROTO_ICMP:
854 case IPPROTO_ICMPV6:
855 port = htons(uli->icmpt.type);
856 break;
857 case IPPROTO_MH:
858 port = htons(uli->mht.type);
859 break;
860 case IPPROTO_GRE:
861 port = htons(ntohl(uli->gre_key) >> 16);
862 break;
863 default:
864 port = 0; /*XXX*/
865 }
866 return port;
867}
868
869static __inline__
870__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
871{
872 __be16 port;
873 switch(fl->flowi_proto) {
874 case IPPROTO_TCP:
875 case IPPROTO_UDP:
876 case IPPROTO_UDPLITE:
877 case IPPROTO_SCTP:
878 port = uli->ports.dport;
879 break;
880 case IPPROTO_ICMP:
881 case IPPROTO_ICMPV6:
882 port = htons(uli->icmpt.code);
883 break;
884 case IPPROTO_GRE:
885 port = htons(ntohl(uli->gre_key) & 0xffff);
886 break;
887 default:
888 port = 0; /*XXX*/
889 }
890 return port;
891}
892
893bool xfrm_selector_match(const struct xfrm_selector *sel,
894 const struct flowi *fl, unsigned short family);
895
896#ifdef CONFIG_SECURITY_NETWORK_XFRM
897/* If neither has a context --> match
898 * Otherwise, both must have a context and the sids, doi, alg must match
899 */
900static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
901{
902 return ((!s1 && !s2) ||
903 (s1 && s2 &&
904 (s1->ctx_sid == s2->ctx_sid) &&
905 (s1->ctx_doi == s2->ctx_doi) &&
906 (s1->ctx_alg == s2->ctx_alg)));
907}
908#else
909static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
910{
911 return true;
912}
913#endif
914
915/* A struct encoding bundle of transformations to apply to some set of flow.
916 *
917 * xdst->child points to the next element of bundle.
918 * dst->xfrm points to an instanse of transformer.
919 *
920 * Due to unfortunate limitations of current routing cache, which we
921 * have no time to fix, it mirrors struct rtable and bound to the same
922 * routing key, including saddr,daddr. However, we can have many of
923 * bundles differing by session id. All the bundles grow from a parent
924 * policy rule.
925 */
926struct xfrm_dst {
927 union {
928 struct dst_entry dst;
929 struct rtable rt;
930 struct rt6_info rt6;
931 } u;
932 struct dst_entry *route;
933 struct dst_entry *child;
934 struct dst_entry *path;
935 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
936 int num_pols, num_xfrms;
937 u32 xfrm_genid;
938 u32 policy_genid;
939 u32 route_mtu_cached;
940 u32 child_mtu_cached;
941 u32 route_cookie;
942 u32 path_cookie;
943};
944
945static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
946{
947#ifdef CONFIG_XFRM
948 if (dst->xfrm) {
949 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
950
951 return xdst->path;
952 }
953#endif
954 return (struct dst_entry *) dst;
955}
956
957static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
958{
959#ifdef CONFIG_XFRM
960 if (dst->xfrm) {
961 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
962 return xdst->child;
963 }
964#endif
965 return NULL;
966}
967
968#ifdef CONFIG_XFRM
969static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
970{
971 xdst->child = child;
972}
973
974static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
975{
976 xfrm_pols_put(xdst->pols, xdst->num_pols);
977 dst_release(xdst->route);
978 if (likely(xdst->u.dst.xfrm))
979 xfrm_state_put(xdst->u.dst.xfrm);
980}
981#endif
982
983void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
984
985struct xfrm_if_parms {
986 int link; /* ifindex of underlying L2 interface */
987 u32 if_id; /* interface identifyer */
988};
989
990struct xfrm_if {
991 struct xfrm_if __rcu *next; /* next interface in list */
992 struct net_device *dev; /* virtual device associated with interface */
993 struct net *net; /* netns for packet i/o */
994 struct xfrm_if_parms p; /* interface parms */
995
996 struct gro_cells gro_cells;
997};
998
999struct xfrm_offload {
1000 /* Output sequence number for replay protection on offloading. */
1001 struct {
1002 __u32 low;
1003 __u32 hi;
1004 } seq;
1005
1006 __u32 flags;
1007#define SA_DELETE_REQ 1
1008#define CRYPTO_DONE 2
1009#define CRYPTO_NEXT_DONE 4
1010#define CRYPTO_FALLBACK 8
1011#define XFRM_GSO_SEGMENT 16
1012#define XFRM_GRO 32
1013#define XFRM_ESP_NO_TRAILER 64
1014#define XFRM_DEV_RESUME 128
1015
1016 __u32 status;
1017#define CRYPTO_SUCCESS 1
1018#define CRYPTO_GENERIC_ERROR 2
1019#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1020#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1021#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1022#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1023#define CRYPTO_INVALID_PACKET_SYNTAX 64
1024#define CRYPTO_INVALID_PROTOCOL 128
1025
1026 __u8 proto;
1027};
1028
1029struct sec_path {
1030 int len;
1031 int olen;
1032
1033 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1034 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1035};
1036
1037struct sec_path *secpath_set(struct sk_buff *skb);
1038
1039static inline void
1040secpath_reset(struct sk_buff *skb)
1041{
1042#ifdef CONFIG_XFRM
1043 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1044#endif
1045}
1046
1047static inline int
1048xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1049{
1050 switch (family) {
1051 case AF_INET:
1052 return addr->a4 == 0;
1053 case AF_INET6:
1054 return ipv6_addr_any(&addr->in6);
1055 }
1056 return 0;
1057}
1058
1059static inline int
1060__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1061{
1062 return (tmpl->saddr.a4 &&
1063 tmpl->saddr.a4 != x->props.saddr.a4);
1064}
1065
1066static inline int
1067__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1068{
1069 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1070 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1071}
1072
1073static inline int
1074xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1075{
1076 switch (family) {
1077 case AF_INET:
1078 return __xfrm4_state_addr_cmp(tmpl, x);
1079 case AF_INET6:
1080 return __xfrm6_state_addr_cmp(tmpl, x);
1081 }
1082 return !0;
1083}
1084
1085#ifdef CONFIG_XFRM
1086int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1087 unsigned short family);
1088
1089static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1090 struct sk_buff *skb,
1091 unsigned int family, int reverse)
1092{
1093 struct net *net = dev_net(skb->dev);
1094 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1095
1096 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1097 return __xfrm_policy_check(sk, ndir, skb, family);
1098
1099 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1100 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1101 __xfrm_policy_check(sk, ndir, skb, family);
1102}
1103
1104static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1105{
1106 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1107}
1108
1109static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1110{
1111 return xfrm_policy_check(sk, dir, skb, AF_INET);
1112}
1113
1114static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1115{
1116 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1117}
1118
1119static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1120 struct sk_buff *skb)
1121{
1122 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1123}
1124
1125static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1126 struct sk_buff *skb)
1127{
1128 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1129}
1130
1131int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1132 unsigned int family, int reverse);
1133
1134static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1135 unsigned int family)
1136{
1137 return __xfrm_decode_session(skb, fl, family, 0);
1138}
1139
1140static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1141 struct flowi *fl,
1142 unsigned int family)
1143{
1144 return __xfrm_decode_session(skb, fl, family, 1);
1145}
1146
1147int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1148
1149static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1150{
1151 struct net *net = dev_net(skb->dev);
1152
1153 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1154 (skb_dst(skb)->flags & DST_NOXFRM) ||
1155 __xfrm_route_forward(skb, family);
1156}
1157
1158static inline int xfrm4_route_forward(struct sk_buff *skb)
1159{
1160 return xfrm_route_forward(skb, AF_INET);
1161}
1162
1163static inline int xfrm6_route_forward(struct sk_buff *skb)
1164{
1165 return xfrm_route_forward(skb, AF_INET6);
1166}
1167
1168int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1169
1170static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1171{
1172 sk->sk_policy[0] = NULL;
1173 sk->sk_policy[1] = NULL;
1174 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1175 return __xfrm_sk_clone_policy(sk, osk);
1176 return 0;
1177}
1178
1179int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1180
1181static inline void xfrm_sk_free_policy(struct sock *sk)
1182{
1183 struct xfrm_policy *pol;
1184
1185 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1186 if (unlikely(pol != NULL)) {
1187 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1188 sk->sk_policy[0] = NULL;
1189 }
1190 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1191 if (unlikely(pol != NULL)) {
1192 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1193 sk->sk_policy[1] = NULL;
1194 }
1195}
1196
1197#else
1198
1199static inline void xfrm_sk_free_policy(struct sock *sk) {}
1200static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1201static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1202static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1203static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1204{
1205 return 1;
1206}
1207static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1208{
1209 return 1;
1210}
1211static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1212{
1213 return 1;
1214}
1215static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1216 struct flowi *fl,
1217 unsigned int family)
1218{
1219 return -ENOSYS;
1220}
1221static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1222 struct sk_buff *skb)
1223{
1224 return 1;
1225}
1226static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1227 struct sk_buff *skb)
1228{
1229 return 1;
1230}
1231#endif
1232
1233static __inline__
1234xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1235{
1236 switch (family){
1237 case AF_INET:
1238 return (xfrm_address_t *)&fl->u.ip4.daddr;
1239 case AF_INET6:
1240 return (xfrm_address_t *)&fl->u.ip6.daddr;
1241 }
1242 return NULL;
1243}
1244
1245static __inline__
1246xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1247{
1248 switch (family){
1249 case AF_INET:
1250 return (xfrm_address_t *)&fl->u.ip4.saddr;
1251 case AF_INET6:
1252 return (xfrm_address_t *)&fl->u.ip6.saddr;
1253 }
1254 return NULL;
1255}
1256
1257static __inline__
1258void xfrm_flowi_addr_get(const struct flowi *fl,
1259 xfrm_address_t *saddr, xfrm_address_t *daddr,
1260 unsigned short family)
1261{
1262 switch(family) {
1263 case AF_INET:
1264 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1265 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1266 break;
1267 case AF_INET6:
1268 saddr->in6 = fl->u.ip6.saddr;
1269 daddr->in6 = fl->u.ip6.daddr;
1270 break;
1271 }
1272}
1273
1274static __inline__ int
1275__xfrm4_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277{
1278 if (daddr->a4 == x->id.daddr.a4 &&
1279 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1280 return 1;
1281 return 0;
1282}
1283
1284static __inline__ int
1285__xfrm6_state_addr_check(const struct xfrm_state *x,
1286 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1287{
1288 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1289 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1290 ipv6_addr_any((struct in6_addr *)saddr) ||
1291 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1292 return 1;
1293 return 0;
1294}
1295
1296static __inline__ int
1297xfrm_state_addr_check(const struct xfrm_state *x,
1298 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1299 unsigned short family)
1300{
1301 switch (family) {
1302 case AF_INET:
1303 return __xfrm4_state_addr_check(x, daddr, saddr);
1304 case AF_INET6:
1305 return __xfrm6_state_addr_check(x, daddr, saddr);
1306 }
1307 return 0;
1308}
1309
1310static __inline__ int
1311xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1312 unsigned short family)
1313{
1314 switch (family) {
1315 case AF_INET:
1316 return __xfrm4_state_addr_check(x,
1317 (const xfrm_address_t *)&fl->u.ip4.daddr,
1318 (const xfrm_address_t *)&fl->u.ip4.saddr);
1319 case AF_INET6:
1320 return __xfrm6_state_addr_check(x,
1321 (const xfrm_address_t *)&fl->u.ip6.daddr,
1322 (const xfrm_address_t *)&fl->u.ip6.saddr);
1323 }
1324 return 0;
1325}
1326
1327static inline int xfrm_state_kern(const struct xfrm_state *x)
1328{
1329 return atomic_read(&x->tunnel_users);
1330}
1331
1332static inline bool xfrm_id_proto_valid(u8 proto)
1333{
1334 switch (proto) {
1335 case IPPROTO_AH:
1336 case IPPROTO_ESP:
1337 case IPPROTO_COMP:
1338#if IS_ENABLED(CONFIG_IPV6)
1339 case IPPROTO_ROUTING:
1340 case IPPROTO_DSTOPTS:
1341#endif
1342 return true;
1343 default:
1344 return false;
1345 }
1346}
1347
1348/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1349static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1350{
1351 return (!userproto || proto == userproto ||
1352 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1353 proto == IPPROTO_ESP ||
1354 proto == IPPROTO_COMP)));
1355}
1356
1357/*
1358 * xfrm algorithm information
1359 */
1360struct xfrm_algo_aead_info {
1361 char *geniv;
1362 u16 icv_truncbits;
1363};
1364
1365struct xfrm_algo_auth_info {
1366 u16 icv_truncbits;
1367 u16 icv_fullbits;
1368};
1369
1370struct xfrm_algo_encr_info {
1371 char *geniv;
1372 u16 blockbits;
1373 u16 defkeybits;
1374};
1375
1376struct xfrm_algo_comp_info {
1377 u16 threshold;
1378};
1379
1380struct xfrm_algo_desc {
1381 char *name;
1382 char *compat;
1383 u8 available:1;
1384 u8 pfkey_supported:1;
1385 union {
1386 struct xfrm_algo_aead_info aead;
1387 struct xfrm_algo_auth_info auth;
1388 struct xfrm_algo_encr_info encr;
1389 struct xfrm_algo_comp_info comp;
1390 } uinfo;
1391 struct sadb_alg desc;
1392};
1393
1394/* XFRM protocol handlers. */
1395struct xfrm4_protocol {
1396 int (*handler)(struct sk_buff *skb);
1397 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1398 int encap_type);
1399 int (*cb_handler)(struct sk_buff *skb, int err);
1400 int (*err_handler)(struct sk_buff *skb, u32 info);
1401
1402 struct xfrm4_protocol __rcu *next;
1403 int priority;
1404};
1405
1406struct xfrm6_protocol {
1407 int (*handler)(struct sk_buff *skb);
1408 int (*cb_handler)(struct sk_buff *skb, int err);
1409 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1410 u8 type, u8 code, int offset, __be32 info);
1411
1412 struct xfrm6_protocol __rcu *next;
1413 int priority;
1414};
1415
1416/* XFRM tunnel handlers. */
1417struct xfrm_tunnel {
1418 int (*handler)(struct sk_buff *skb);
1419 int (*err_handler)(struct sk_buff *skb, u32 info);
1420
1421 struct xfrm_tunnel __rcu *next;
1422 int priority;
1423};
1424
1425struct xfrm6_tunnel {
1426 int (*handler)(struct sk_buff *skb);
1427 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1428 u8 type, u8 code, int offset, __be32 info);
1429 struct xfrm6_tunnel __rcu *next;
1430 int priority;
1431};
1432
1433void xfrm_init(void);
1434void xfrm4_init(void);
1435int xfrm_state_init(struct net *net);
1436void xfrm_state_fini(struct net *net);
1437void xfrm4_state_init(void);
1438void xfrm4_protocol_init(void);
1439#ifdef CONFIG_XFRM
1440int xfrm6_init(void);
1441void xfrm6_fini(void);
1442int xfrm6_state_init(void);
1443void xfrm6_state_fini(void);
1444int xfrm6_protocol_init(void);
1445void xfrm6_protocol_fini(void);
1446#else
1447static inline int xfrm6_init(void)
1448{
1449 return 0;
1450}
1451static inline void xfrm6_fini(void)
1452{
1453 ;
1454}
1455#endif
1456
1457#ifdef CONFIG_XFRM_STATISTICS
1458int xfrm_proc_init(struct net *net);
1459void xfrm_proc_fini(struct net *net);
1460#endif
1461
1462int xfrm_sysctl_init(struct net *net);
1463#ifdef CONFIG_SYSCTL
1464void xfrm_sysctl_fini(struct net *net);
1465#else
1466static inline void xfrm_sysctl_fini(struct net *net)
1467{
1468}
1469#endif
1470
1471void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1472 struct xfrm_address_filter *filter);
1473int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1474 int (*func)(struct xfrm_state *, int, void*), void *);
1475void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1476struct xfrm_state *xfrm_state_alloc(struct net *net);
1477void xfrm_state_free(struct xfrm_state *x);
1478struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1479 const xfrm_address_t *saddr,
1480 const struct flowi *fl,
1481 struct xfrm_tmpl *tmpl,
1482 struct xfrm_policy *pol, int *err,
1483 unsigned short family, u32 if_id);
1484struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1485 xfrm_address_t *daddr,
1486 xfrm_address_t *saddr,
1487 unsigned short family,
1488 u8 mode, u8 proto, u32 reqid);
1489struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1490 unsigned short family);
1491int xfrm_state_check_expire(struct xfrm_state *x);
1492void xfrm_state_insert(struct xfrm_state *x);
1493int xfrm_state_add(struct xfrm_state *x);
1494int xfrm_state_update(struct xfrm_state *x);
1495struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1496 const xfrm_address_t *daddr, __be32 spi,
1497 u8 proto, unsigned short family);
1498struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1499 const xfrm_address_t *daddr,
1500 const xfrm_address_t *saddr,
1501 u8 proto,
1502 unsigned short family);
1503#ifdef CONFIG_XFRM_SUB_POLICY
1504void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1505 unsigned short family);
1506void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1507 unsigned short family);
1508#else
1509static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1510 int n, unsigned short family)
1511{
1512}
1513
1514static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1515 int n, unsigned short family)
1516{
1517}
1518#endif
1519
1520struct xfrmk_sadinfo {
1521 u32 sadhcnt; /* current hash bkts */
1522 u32 sadhmcnt; /* max allowed hash bkts */
1523 u32 sadcnt; /* current running count */
1524};
1525
1526struct xfrmk_spdinfo {
1527 u32 incnt;
1528 u32 outcnt;
1529 u32 fwdcnt;
1530 u32 inscnt;
1531 u32 outscnt;
1532 u32 fwdscnt;
1533 u32 spdhcnt;
1534 u32 spdhmcnt;
1535};
1536
1537struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1538int xfrm_state_delete(struct xfrm_state *x);
1539int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1540int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1541void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1542void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1543u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1544int xfrm_init_replay(struct xfrm_state *x);
1545u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1546int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1547int xfrm_init_state(struct xfrm_state *x);
1548int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1549int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1550int xfrm_trans_queue(struct sk_buff *skb,
1551 int (*finish)(struct net *, struct sock *,
1552 struct sk_buff *));
1553int xfrm_output_resume(struct sk_buff *skb, int err);
1554int xfrm_output(struct sock *sk, struct sk_buff *skb);
1555
1556#if IS_ENABLED(CONFIG_NET_PKTGEN)
1557int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1558#endif
1559
1560void xfrm_local_error(struct sk_buff *skb, int mtu);
1561int xfrm4_extract_header(struct sk_buff *skb);
1562int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1563int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1564 int encap_type);
1565int xfrm4_transport_finish(struct sk_buff *skb, int async);
1566int xfrm4_rcv(struct sk_buff *skb);
1567int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1568
1569static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1570{
1571 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1572 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1573 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1574 return xfrm_input(skb, nexthdr, spi, 0);
1575}
1576
1577int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1578int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1579int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1580int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1581int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1582int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1583int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1584void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1585int xfrm6_extract_header(struct sk_buff *skb);
1586int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1587int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1588 struct ip6_tnl *t);
1589int xfrm6_transport_finish(struct sk_buff *skb, int async);
1590int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1591int xfrm6_rcv(struct sk_buff *skb);
1592int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1593 xfrm_address_t *saddr, u8 proto);
1594void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1595int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1596int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1597int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1598int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1599__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1600__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1601int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1602int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1603int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1604int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1605 u8 **prevhdr);
1606
1607#ifdef CONFIG_XFRM
1608int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1609int xfrm_user_policy(struct sock *sk, int optname,
1610 u8 __user *optval, int optlen);
1611#else
1612static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1613{
1614 return -ENOPROTOOPT;
1615}
1616
1617static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1618{
1619 /* should not happen */
1620 kfree_skb(skb);
1621 return 0;
1622}
1623#endif
1624
1625struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1626 const xfrm_address_t *saddr,
1627 const xfrm_address_t *daddr,
1628 int family, u32 mark);
1629
1630struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1631
1632void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1633int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1634 int (*func)(struct xfrm_policy *, int, int, void*),
1635 void *);
1636void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1637int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1638struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1639 u8 type, int dir,
1640 struct xfrm_selector *sel,
1641 struct xfrm_sec_ctx *ctx, int delete,
1642 int *err);
1643struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1644 int dir, u32 id, int delete, int *err);
1645int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1646void xfrm_policy_hash_rebuild(struct net *net);
1647u32 xfrm_get_acqseq(void);
1648int verify_spi_info(u8 proto, u32 min, u32 max);
1649int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1650struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1651 u8 mode, u32 reqid, u32 if_id, u8 proto,
1652 const xfrm_address_t *daddr,
1653 const xfrm_address_t *saddr, int create,
1654 unsigned short family);
1655int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1656
1657#ifdef CONFIG_XFRM_MIGRATE
1658int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1659 const struct xfrm_migrate *m, int num_bundles,
1660 const struct xfrm_kmaddress *k,
1661 const struct xfrm_encap_tmpl *encap);
1662struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1663struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1664 struct xfrm_migrate *m,
1665 struct xfrm_encap_tmpl *encap);
1666int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1667 struct xfrm_migrate *m, int num_bundles,
1668 struct xfrm_kmaddress *k, struct net *net,
1669 struct xfrm_encap_tmpl *encap);
1670#endif
1671
1672int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1673void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1674int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1675 xfrm_address_t *addr);
1676
1677void xfrm_input_init(void);
1678int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1679
1680void xfrm_probe_algs(void);
1681int xfrm_count_pfkey_auth_supported(void);
1682int xfrm_count_pfkey_enc_supported(void);
1683struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1684struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1685struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1686struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1687struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1688struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1689struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1690struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1691struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1692 int probe);
1693
1694static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1695 const xfrm_address_t *b)
1696{
1697 return ipv6_addr_equal((const struct in6_addr *)a,
1698 (const struct in6_addr *)b);
1699}
1700
1701static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1702 const xfrm_address_t *b,
1703 sa_family_t family)
1704{
1705 switch (family) {
1706 default:
1707 case AF_INET:
1708 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1709 case AF_INET6:
1710 return xfrm6_addr_equal(a, b);
1711 }
1712}
1713
1714static inline int xfrm_policy_id2dir(u32 index)
1715{
1716 return index & 7;
1717}
1718
1719#ifdef CONFIG_XFRM
1720static inline int xfrm_aevent_is_on(struct net *net)
1721{
1722 struct sock *nlsk;
1723 int ret = 0;
1724
1725 rcu_read_lock();
1726 nlsk = rcu_dereference(net->xfrm.nlsk);
1727 if (nlsk)
1728 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1729 rcu_read_unlock();
1730 return ret;
1731}
1732
1733static inline int xfrm_acquire_is_on(struct net *net)
1734{
1735 struct sock *nlsk;
1736 int ret = 0;
1737
1738 rcu_read_lock();
1739 nlsk = rcu_dereference(net->xfrm.nlsk);
1740 if (nlsk)
1741 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1742 rcu_read_unlock();
1743
1744 return ret;
1745}
1746#endif
1747
1748static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1749{
1750 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1751}
1752
1753static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1754{
1755 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1756}
1757
1758static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1759{
1760 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1761}
1762
1763static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1764{
1765 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1766}
1767
1768#ifdef CONFIG_XFRM_MIGRATE
1769static inline int xfrm_replay_clone(struct xfrm_state *x,
1770 struct xfrm_state *orig)
1771{
1772 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1773 GFP_KERNEL);
1774 if (!x->replay_esn)
1775 return -ENOMEM;
1776
1777 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1778 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1779
1780 x->preplay_esn = kmemdup(x->replay_esn,
1781 xfrm_replay_state_esn_len(x->replay_esn),
1782 GFP_KERNEL);
1783 if (!x->preplay_esn) {
1784 kfree(x->replay_esn);
1785 return -ENOMEM;
1786 }
1787
1788 return 0;
1789}
1790
1791static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1792{
1793 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1794}
1795
1796
1797static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1798{
1799 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1800}
1801
1802static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1803{
1804 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1805}
1806
1807static inline void xfrm_states_put(struct xfrm_state **states, int n)
1808{
1809 int i;
1810 for (i = 0; i < n; i++)
1811 xfrm_state_put(*(states + i));
1812}
1813
1814static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1815{
1816 int i;
1817 for (i = 0; i < n; i++)
1818 xfrm_state_delete(*(states + i));
1819}
1820#endif
1821
1822#ifdef CONFIG_XFRM
1823static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1824{
1825 struct sec_path *sp = skb_sec_path(skb);
1826
1827 return sp->xvec[sp->len - 1];
1828}
1829#endif
1830
1831static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1832{
1833#ifdef CONFIG_XFRM
1834 struct sec_path *sp = skb_sec_path(skb);
1835
1836 if (!sp || !sp->olen || sp->len != sp->olen)
1837 return NULL;
1838
1839 return &sp->ovec[sp->olen - 1];
1840#else
1841 return NULL;
1842#endif
1843}
1844
1845void __init xfrm_dev_init(void);
1846
1847#ifdef CONFIG_XFRM_OFFLOAD
1848void xfrm_dev_resume(struct sk_buff *skb);
1849void xfrm_dev_backlog(struct softnet_data *sd);
1850struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1851int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1852 struct xfrm_user_offload *xuo);
1853bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1854
1855static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1856{
1857 struct xfrm_state_offload *xso = &x->xso;
1858
1859 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1860 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1861}
1862
1863static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1864{
1865 struct xfrm_state *x = dst->xfrm;
1866 struct xfrm_dst *xdst;
1867
1868 if (!x || !x->type_offload)
1869 return false;
1870
1871 xdst = (struct xfrm_dst *) dst;
1872 if (!x->xso.offload_handle && !xdst->child->xfrm)
1873 return true;
1874 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1875 !xdst->child->xfrm)
1876 return true;
1877
1878 return false;
1879}
1880
1881static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1882{
1883 struct xfrm_state_offload *xso = &x->xso;
1884
1885 if (xso->dev)
1886 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1887}
1888
1889static inline void xfrm_dev_state_free(struct xfrm_state *x)
1890{
1891 struct xfrm_state_offload *xso = &x->xso;
1892 struct net_device *dev = xso->dev;
1893
1894 if (dev && dev->xfrmdev_ops) {
1895 if (dev->xfrmdev_ops->xdo_dev_state_free)
1896 dev->xfrmdev_ops->xdo_dev_state_free(x);
1897 xso->dev = NULL;
1898 dev_put(dev);
1899 }
1900}
1901#else
1902static inline void xfrm_dev_resume(struct sk_buff *skb)
1903{
1904}
1905
1906static inline void xfrm_dev_backlog(struct softnet_data *sd)
1907{
1908}
1909
1910static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1911{
1912 return skb;
1913}
1914
1915static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1916{
1917 return 0;
1918}
1919
1920static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1921{
1922}
1923
1924static inline void xfrm_dev_state_free(struct xfrm_state *x)
1925{
1926}
1927
1928static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1929{
1930 return false;
1931}
1932
1933static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1934{
1935}
1936
1937static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1938{
1939 return false;
1940}
1941#endif
1942
1943static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1944{
1945 if (attrs[XFRMA_MARK])
1946 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1947 else
1948 m->v = m->m = 0;
1949
1950 return m->v & m->m;
1951}
1952
1953static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1954{
1955 int ret = 0;
1956
1957 if (m->m | m->v)
1958 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1959 return ret;
1960}
1961
1962static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1963{
1964 struct xfrm_mark *m = &x->props.smark;
1965
1966 return (m->v & m->m) | (mark & ~m->m);
1967}
1968
1969static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1970{
1971 int ret = 0;
1972
1973 if (if_id)
1974 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1975 return ret;
1976}
1977
1978static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1979 unsigned int family)
1980{
1981 bool tunnel = false;
1982
1983 switch(family) {
1984 case AF_INET:
1985 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1986 tunnel = true;
1987 break;
1988 case AF_INET6:
1989 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1990 tunnel = true;
1991 break;
1992 }
1993 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1994 return -EINVAL;
1995
1996 return 0;
1997}
1998#endif /* _NET_XFRM_H */
1#ifndef _NET_XFRM_H
2#define _NET_XFRM_H
3
4#include <linux/compiler.h>
5#include <linux/xfrm.h>
6#include <linux/spinlock.h>
7#include <linux/list.h>
8#include <linux/skbuff.h>
9#include <linux/socket.h>
10#include <linux/pfkeyv2.h>
11#include <linux/ipsec.h>
12#include <linux/in6.h>
13#include <linux/mutex.h>
14#include <linux/audit.h>
15#include <linux/slab.h>
16
17#include <net/sock.h>
18#include <net/dst.h>
19#include <net/ip.h>
20#include <net/route.h>
21#include <net/ipv6.h>
22#include <net/ip6_fib.h>
23#include <net/flow.h>
24
25#include <linux/interrupt.h>
26
27#ifdef CONFIG_XFRM_STATISTICS
28#include <net/snmp.h>
29#endif
30
31#define XFRM_PROTO_ESP 50
32#define XFRM_PROTO_AH 51
33#define XFRM_PROTO_COMP 108
34#define XFRM_PROTO_IPIP 4
35#define XFRM_PROTO_IPV6 41
36#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41#define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46#ifdef CONFIG_XFRM_STATISTICS
47#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48#define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49#define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50#else
51#define XFRM_INC_STATS(net, field) ((void)(net))
52#define XFRM_INC_STATS_BH(net, field) ((void)(net))
53#define XFRM_INC_STATS_USER(net, field) ((void)(net))
54#endif
55
56
57/* Organization of SPD aka "XFRM rules"
58 ------------------------------------
59
60 Basic objects:
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
65
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
70
71 Lookup is plain linear search until the first match with selector.
72
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
79
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
83 |---. child .-> NULL
84
85 Bundles are cached at xrfm_policy struct (field ->bundles).
86
87
88 Resolution of xrfm_tmpl
89 -----------------------
90 Template contains:
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
101 flow id?
102
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
106
107 PROBLEMS:
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116 */
117
118struct xfrm_state_walk {
119 struct list_head all;
120 u8 state;
121 u8 dying;
122 u8 proto;
123 u32 seq;
124 struct xfrm_address_filter *filter;
125};
126
127/* Full description of state of transformer. */
128struct xfrm_state {
129 possible_net_t xs_net;
130 union {
131 struct hlist_node gclist;
132 struct hlist_node bydst;
133 };
134 struct hlist_node bysrc;
135 struct hlist_node byspi;
136
137 atomic_t refcnt;
138 spinlock_t lock;
139
140 struct xfrm_id id;
141 struct xfrm_selector sel;
142 struct xfrm_mark mark;
143 u32 tfcpad;
144
145 u32 genid;
146
147 /* Key manager bits */
148 struct xfrm_state_walk km;
149
150 /* Parameters of this state. */
151 struct {
152 u32 reqid;
153 u8 mode;
154 u8 replay_window;
155 u8 aalgo, ealgo, calgo;
156 u8 flags;
157 u16 family;
158 xfrm_address_t saddr;
159 int header_len;
160 int trailer_len;
161 u32 extra_flags;
162 } props;
163
164 struct xfrm_lifetime_cfg lft;
165
166 /* Data for transformer */
167 struct xfrm_algo_auth *aalg;
168 struct xfrm_algo *ealg;
169 struct xfrm_algo *calg;
170 struct xfrm_algo_aead *aead;
171 const char *geniv;
172
173 /* Data for encapsulator */
174 struct xfrm_encap_tmpl *encap;
175
176 /* Data for care-of address */
177 xfrm_address_t *coaddr;
178
179 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
180 struct xfrm_state *tunnel;
181
182 /* If a tunnel, number of users + 1 */
183 atomic_t tunnel_users;
184
185 /* State for replay detection */
186 struct xfrm_replay_state replay;
187 struct xfrm_replay_state_esn *replay_esn;
188
189 /* Replay detection state at the time we sent the last notification */
190 struct xfrm_replay_state preplay;
191 struct xfrm_replay_state_esn *preplay_esn;
192
193 /* The functions for replay detection. */
194 struct xfrm_replay *repl;
195
196 /* internal flag that only holds state for delayed aevent at the
197 * moment
198 */
199 u32 xflags;
200
201 /* Replay detection notification settings */
202 u32 replay_maxage;
203 u32 replay_maxdiff;
204
205 /* Replay detection notification timer */
206 struct timer_list rtimer;
207
208 /* Statistics */
209 struct xfrm_stats stats;
210
211 struct xfrm_lifetime_cur curlft;
212 struct tasklet_hrtimer mtimer;
213
214 /* used to fix curlft->add_time when changing date */
215 long saved_tmo;
216
217 /* Last used time */
218 unsigned long lastused;
219
220 /* Reference to data common to all the instances of this
221 * transformer. */
222 const struct xfrm_type *type;
223 struct xfrm_mode *inner_mode;
224 struct xfrm_mode *inner_mode_iaf;
225 struct xfrm_mode *outer_mode;
226
227 /* Security context */
228 struct xfrm_sec_ctx *security;
229
230 /* Private data of this transformer, format is opaque,
231 * interpreted by xfrm_type methods. */
232 void *data;
233};
234
235static inline struct net *xs_net(struct xfrm_state *x)
236{
237 return read_pnet(&x->xs_net);
238}
239
240/* xflags - make enum if more show up */
241#define XFRM_TIME_DEFER 1
242#define XFRM_SOFT_EXPIRE 2
243
244enum {
245 XFRM_STATE_VOID,
246 XFRM_STATE_ACQ,
247 XFRM_STATE_VALID,
248 XFRM_STATE_ERROR,
249 XFRM_STATE_EXPIRED,
250 XFRM_STATE_DEAD
251};
252
253/* callback structure passed from either netlink or pfkey */
254struct km_event {
255 union {
256 u32 hard;
257 u32 proto;
258 u32 byid;
259 u32 aevent;
260 u32 type;
261 } data;
262
263 u32 seq;
264 u32 portid;
265 u32 event;
266 struct net *net;
267};
268
269struct xfrm_replay {
270 void (*advance)(struct xfrm_state *x, __be32 net_seq);
271 int (*check)(struct xfrm_state *x,
272 struct sk_buff *skb,
273 __be32 net_seq);
274 int (*recheck)(struct xfrm_state *x,
275 struct sk_buff *skb,
276 __be32 net_seq);
277 void (*notify)(struct xfrm_state *x, int event);
278 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
279};
280
281struct net_device;
282struct xfrm_type;
283struct xfrm_dst;
284struct xfrm_policy_afinfo {
285 unsigned short family;
286 struct dst_ops *dst_ops;
287 void (*garbage_collect)(struct net *net);
288 struct dst_entry *(*dst_lookup)(struct net *net,
289 int tos, int oif,
290 const xfrm_address_t *saddr,
291 const xfrm_address_t *daddr);
292 int (*get_saddr)(struct net *net, int oif,
293 xfrm_address_t *saddr,
294 xfrm_address_t *daddr);
295 void (*decode_session)(struct sk_buff *skb,
296 struct flowi *fl,
297 int reverse);
298 int (*get_tos)(const struct flowi *fl);
299 int (*init_path)(struct xfrm_dst *path,
300 struct dst_entry *dst,
301 int nfheader_len);
302 int (*fill_dst)(struct xfrm_dst *xdst,
303 struct net_device *dev,
304 const struct flowi *fl);
305 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
306};
307
308int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
309int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
310void km_policy_notify(struct xfrm_policy *xp, int dir,
311 const struct km_event *c);
312void km_state_notify(struct xfrm_state *x, const struct km_event *c);
313
314struct xfrm_tmpl;
315int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
316 struct xfrm_policy *pol);
317void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
318int __xfrm_state_delete(struct xfrm_state *x);
319
320struct xfrm_state_afinfo {
321 unsigned int family;
322 unsigned int proto;
323 __be16 eth_proto;
324 struct module *owner;
325 const struct xfrm_type *type_map[IPPROTO_MAX];
326 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
327 int (*init_flags)(struct xfrm_state *x);
328 void (*init_tempsel)(struct xfrm_selector *sel,
329 const struct flowi *fl);
330 void (*init_temprop)(struct xfrm_state *x,
331 const struct xfrm_tmpl *tmpl,
332 const xfrm_address_t *daddr,
333 const xfrm_address_t *saddr);
334 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
335 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
336 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
337 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
338 int (*extract_input)(struct xfrm_state *x,
339 struct sk_buff *skb);
340 int (*extract_output)(struct xfrm_state *x,
341 struct sk_buff *skb);
342 int (*transport_finish)(struct sk_buff *skb,
343 int async);
344 void (*local_error)(struct sk_buff *skb, u32 mtu);
345};
346
347int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
348int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
349struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
350void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
351
352struct xfrm_input_afinfo {
353 unsigned int family;
354 struct module *owner;
355 int (*callback)(struct sk_buff *skb, u8 protocol,
356 int err);
357};
358
359int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
360int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
361
362void xfrm_state_delete_tunnel(struct xfrm_state *x);
363
364struct xfrm_type {
365 char *description;
366 struct module *owner;
367 u8 proto;
368 u8 flags;
369#define XFRM_TYPE_NON_FRAGMENT 1
370#define XFRM_TYPE_REPLAY_PROT 2
371#define XFRM_TYPE_LOCAL_COADDR 4
372#define XFRM_TYPE_REMOTE_COADDR 8
373
374 int (*init_state)(struct xfrm_state *x);
375 void (*destructor)(struct xfrm_state *);
376 int (*input)(struct xfrm_state *, struct sk_buff *skb);
377 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
378 int (*reject)(struct xfrm_state *, struct sk_buff *,
379 const struct flowi *);
380 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
381 /* Estimate maximal size of result of transformation of a dgram */
382 u32 (*get_mtu)(struct xfrm_state *, int size);
383};
384
385int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
386int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
387
388struct xfrm_mode {
389 /*
390 * Remove encapsulation header.
391 *
392 * The IP header will be moved over the top of the encapsulation
393 * header.
394 *
395 * On entry, the transport header shall point to where the IP header
396 * should be and the network header shall be set to where the IP
397 * header currently is. skb->data shall point to the start of the
398 * payload.
399 */
400 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
401
402 /*
403 * This is the actual input entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * input2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to the tunnel encapsulation function
408 * xfrm4_prepare_input that would in turn call input2.
409 */
410 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
411
412 /*
413 * Add encapsulation header.
414 *
415 * On exit, the transport header will be set to the start of the
416 * encapsulation header to be filled in by x->type->output and
417 * the mac header will be set to the nextheader (protocol for
418 * IPv4) field of the extension header directly preceding the
419 * encapsulation header, or in its absence, that of the top IP
420 * header. The value of the network header will always point
421 * to the top IP header while skb->data will point to the payload.
422 */
423 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
424
425 /*
426 * This is the actual output entry point.
427 *
428 * For transport mode and equivalent this would be identical to
429 * output2 (which does not need to be set). While tunnel mode
430 * and equivalent would set this to a tunnel encapsulation function
431 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
432 * call output2.
433 */
434 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
435
436 struct xfrm_state_afinfo *afinfo;
437 struct module *owner;
438 unsigned int encap;
439 int flags;
440};
441
442/* Flags for xfrm_mode. */
443enum {
444 XFRM_MODE_FLAG_TUNNEL = 1,
445};
446
447int xfrm_register_mode(struct xfrm_mode *mode, int family);
448int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
449
450static inline int xfrm_af2proto(unsigned int family)
451{
452 switch(family) {
453 case AF_INET:
454 return IPPROTO_IPIP;
455 case AF_INET6:
456 return IPPROTO_IPV6;
457 default:
458 return 0;
459 }
460}
461
462static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
463{
464 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
465 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
466 return x->inner_mode;
467 else
468 return x->inner_mode_iaf;
469}
470
471struct xfrm_tmpl {
472/* id in template is interpreted as:
473 * daddr - destination of tunnel, may be zero for transport mode.
474 * spi - zero to acquire spi. Not zero if spi is static, then
475 * daddr must be fixed too.
476 * proto - AH/ESP/IPCOMP
477 */
478 struct xfrm_id id;
479
480/* Source address of tunnel. Ignored, if it is not a tunnel. */
481 xfrm_address_t saddr;
482
483 unsigned short encap_family;
484
485 u32 reqid;
486
487/* Mode: transport, tunnel etc. */
488 u8 mode;
489
490/* Sharing mode: unique, this session only, this user only etc. */
491 u8 share;
492
493/* May skip this transfomration if no SA is found */
494 u8 optional;
495
496/* Skip aalgos/ealgos/calgos checks. */
497 u8 allalgs;
498
499/* Bit mask of algos allowed for acquisition */
500 u32 aalgos;
501 u32 ealgos;
502 u32 calgos;
503};
504
505#define XFRM_MAX_DEPTH 6
506
507struct xfrm_policy_walk_entry {
508 struct list_head all;
509 u8 dead;
510};
511
512struct xfrm_policy_walk {
513 struct xfrm_policy_walk_entry walk;
514 u8 type;
515 u32 seq;
516};
517
518struct xfrm_policy_queue {
519 struct sk_buff_head hold_queue;
520 struct timer_list hold_timer;
521 unsigned long timeout;
522};
523
524struct xfrm_policy {
525 possible_net_t xp_net;
526 struct hlist_node bydst;
527 struct hlist_node byidx;
528
529 /* This lock only affects elements except for entry. */
530 rwlock_t lock;
531 atomic_t refcnt;
532 struct timer_list timer;
533
534 struct flow_cache_object flo;
535 atomic_t genid;
536 u32 priority;
537 u32 index;
538 struct xfrm_mark mark;
539 struct xfrm_selector selector;
540 struct xfrm_lifetime_cfg lft;
541 struct xfrm_lifetime_cur curlft;
542 struct xfrm_policy_walk_entry walk;
543 struct xfrm_policy_queue polq;
544 u8 type;
545 u8 action;
546 u8 flags;
547 u8 xfrm_nr;
548 u16 family;
549 struct xfrm_sec_ctx *security;
550 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
551 struct rcu_head rcu;
552};
553
554static inline struct net *xp_net(const struct xfrm_policy *xp)
555{
556 return read_pnet(&xp->xp_net);
557}
558
559struct xfrm_kmaddress {
560 xfrm_address_t local;
561 xfrm_address_t remote;
562 u32 reserved;
563 u16 family;
564};
565
566struct xfrm_migrate {
567 xfrm_address_t old_daddr;
568 xfrm_address_t old_saddr;
569 xfrm_address_t new_daddr;
570 xfrm_address_t new_saddr;
571 u8 proto;
572 u8 mode;
573 u16 reserved;
574 u32 reqid;
575 u16 old_family;
576 u16 new_family;
577};
578
579#define XFRM_KM_TIMEOUT 30
580/* what happened */
581#define XFRM_REPLAY_UPDATE XFRM_AE_CR
582#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
583
584/* default aevent timeout in units of 100ms */
585#define XFRM_AE_ETIME 10
586/* Async Event timer multiplier */
587#define XFRM_AE_ETH_M 10
588/* default seq threshold size */
589#define XFRM_AE_SEQT_SIZE 2
590
591struct xfrm_mgr {
592 struct list_head list;
593 char *id;
594 int (*notify)(struct xfrm_state *x, const struct km_event *c);
595 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
596 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
597 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
598 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
599 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
600 int (*migrate)(const struct xfrm_selector *sel,
601 u8 dir, u8 type,
602 const struct xfrm_migrate *m,
603 int num_bundles,
604 const struct xfrm_kmaddress *k);
605 bool (*is_alive)(const struct km_event *c);
606};
607
608int xfrm_register_km(struct xfrm_mgr *km);
609int xfrm_unregister_km(struct xfrm_mgr *km);
610
611struct xfrm_tunnel_skb_cb {
612 union {
613 struct inet_skb_parm h4;
614 struct inet6_skb_parm h6;
615 } header;
616
617 union {
618 struct ip_tunnel *ip4;
619 struct ip6_tnl *ip6;
620 } tunnel;
621};
622
623#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
624
625/*
626 * This structure is used for the duration where packets are being
627 * transformed by IPsec. As soon as the packet leaves IPsec the
628 * area beyond the generic IP part may be overwritten.
629 */
630struct xfrm_skb_cb {
631 struct xfrm_tunnel_skb_cb header;
632
633 /* Sequence number for replay protection. */
634 union {
635 struct {
636 __u32 low;
637 __u32 hi;
638 } output;
639 struct {
640 __be32 low;
641 __be32 hi;
642 } input;
643 } seq;
644};
645
646#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
647
648/*
649 * This structure is used by the afinfo prepare_input/prepare_output functions
650 * to transmit header information to the mode input/output functions.
651 */
652struct xfrm_mode_skb_cb {
653 struct xfrm_tunnel_skb_cb header;
654
655 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
656 __be16 id;
657 __be16 frag_off;
658
659 /* IP header length (excluding options or extension headers). */
660 u8 ihl;
661
662 /* TOS for IPv4, class for IPv6. */
663 u8 tos;
664
665 /* TTL for IPv4, hop limitfor IPv6. */
666 u8 ttl;
667
668 /* Protocol for IPv4, NH for IPv6. */
669 u8 protocol;
670
671 /* Option length for IPv4, zero for IPv6. */
672 u8 optlen;
673
674 /* Used by IPv6 only, zero for IPv4. */
675 u8 flow_lbl[3];
676};
677
678#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
679
680/*
681 * This structure is used by the input processing to locate the SPI and
682 * related information.
683 */
684struct xfrm_spi_skb_cb {
685 struct xfrm_tunnel_skb_cb header;
686
687 unsigned int daddroff;
688 unsigned int family;
689};
690
691#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
692
693#ifdef CONFIG_AUDITSYSCALL
694static inline struct audit_buffer *xfrm_audit_start(const char *op)
695{
696 struct audit_buffer *audit_buf = NULL;
697
698 if (audit_enabled == 0)
699 return NULL;
700 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
701 AUDIT_MAC_IPSEC_EVENT);
702 if (audit_buf == NULL)
703 return NULL;
704 audit_log_format(audit_buf, "op=%s", op);
705 return audit_buf;
706}
707
708static inline void xfrm_audit_helper_usrinfo(bool task_valid,
709 struct audit_buffer *audit_buf)
710{
711 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
712 audit_get_loginuid(current) :
713 INVALID_UID);
714 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
715 (unsigned int) -1;
716
717 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
718 audit_log_task_context(audit_buf);
719}
720
721void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
722void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
723 bool task_valid);
724void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
725void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
726void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
727 struct sk_buff *skb);
728void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
729 __be32 net_seq);
730void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
731void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
732 __be32 net_seq);
733void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
734 u8 proto);
735#else
736
737static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
738 bool task_valid)
739{
740}
741
742static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
743 bool task_valid)
744{
745}
746
747static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
748 bool task_valid)
749{
750}
751
752static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
753 bool task_valid)
754{
755}
756
757static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
758 struct sk_buff *skb)
759{
760}
761
762static inline void xfrm_audit_state_replay(struct xfrm_state *x,
763 struct sk_buff *skb, __be32 net_seq)
764{
765}
766
767static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
768 u16 family)
769{
770}
771
772static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
773 __be32 net_spi, __be32 net_seq)
774{
775}
776
777static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
778 struct sk_buff *skb, u8 proto)
779{
780}
781#endif /* CONFIG_AUDITSYSCALL */
782
783static inline void xfrm_pol_hold(struct xfrm_policy *policy)
784{
785 if (likely(policy != NULL))
786 atomic_inc(&policy->refcnt);
787}
788
789void xfrm_policy_destroy(struct xfrm_policy *policy);
790
791static inline void xfrm_pol_put(struct xfrm_policy *policy)
792{
793 if (atomic_dec_and_test(&policy->refcnt))
794 xfrm_policy_destroy(policy);
795}
796
797static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
798{
799 int i;
800 for (i = npols - 1; i >= 0; --i)
801 xfrm_pol_put(pols[i]);
802}
803
804void __xfrm_state_destroy(struct xfrm_state *);
805
806static inline void __xfrm_state_put(struct xfrm_state *x)
807{
808 atomic_dec(&x->refcnt);
809}
810
811static inline void xfrm_state_put(struct xfrm_state *x)
812{
813 if (atomic_dec_and_test(&x->refcnt))
814 __xfrm_state_destroy(x);
815}
816
817static inline void xfrm_state_hold(struct xfrm_state *x)
818{
819 atomic_inc(&x->refcnt);
820}
821
822static inline bool addr_match(const void *token1, const void *token2,
823 int prefixlen)
824{
825 const __be32 *a1 = token1;
826 const __be32 *a2 = token2;
827 int pdw;
828 int pbi;
829
830 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
831 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
832
833 if (pdw)
834 if (memcmp(a1, a2, pdw << 2))
835 return false;
836
837 if (pbi) {
838 __be32 mask;
839
840 mask = htonl((0xffffffff) << (32 - pbi));
841
842 if ((a1[pdw] ^ a2[pdw]) & mask)
843 return false;
844 }
845
846 return true;
847}
848
849static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
850{
851 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
852 if (prefixlen == 0)
853 return true;
854 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
855}
856
857static __inline__
858__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
859{
860 __be16 port;
861 switch(fl->flowi_proto) {
862 case IPPROTO_TCP:
863 case IPPROTO_UDP:
864 case IPPROTO_UDPLITE:
865 case IPPROTO_SCTP:
866 port = uli->ports.sport;
867 break;
868 case IPPROTO_ICMP:
869 case IPPROTO_ICMPV6:
870 port = htons(uli->icmpt.type);
871 break;
872 case IPPROTO_MH:
873 port = htons(uli->mht.type);
874 break;
875 case IPPROTO_GRE:
876 port = htons(ntohl(uli->gre_key) >> 16);
877 break;
878 default:
879 port = 0; /*XXX*/
880 }
881 return port;
882}
883
884static __inline__
885__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
886{
887 __be16 port;
888 switch(fl->flowi_proto) {
889 case IPPROTO_TCP:
890 case IPPROTO_UDP:
891 case IPPROTO_UDPLITE:
892 case IPPROTO_SCTP:
893 port = uli->ports.dport;
894 break;
895 case IPPROTO_ICMP:
896 case IPPROTO_ICMPV6:
897 port = htons(uli->icmpt.code);
898 break;
899 case IPPROTO_GRE:
900 port = htons(ntohl(uli->gre_key) & 0xffff);
901 break;
902 default:
903 port = 0; /*XXX*/
904 }
905 return port;
906}
907
908bool xfrm_selector_match(const struct xfrm_selector *sel,
909 const struct flowi *fl, unsigned short family);
910
911#ifdef CONFIG_SECURITY_NETWORK_XFRM
912/* If neither has a context --> match
913 * Otherwise, both must have a context and the sids, doi, alg must match
914 */
915static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
916{
917 return ((!s1 && !s2) ||
918 (s1 && s2 &&
919 (s1->ctx_sid == s2->ctx_sid) &&
920 (s1->ctx_doi == s2->ctx_doi) &&
921 (s1->ctx_alg == s2->ctx_alg)));
922}
923#else
924static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
925{
926 return true;
927}
928#endif
929
930/* A struct encoding bundle of transformations to apply to some set of flow.
931 *
932 * dst->child points to the next element of bundle.
933 * dst->xfrm points to an instanse of transformer.
934 *
935 * Due to unfortunate limitations of current routing cache, which we
936 * have no time to fix, it mirrors struct rtable and bound to the same
937 * routing key, including saddr,daddr. However, we can have many of
938 * bundles differing by session id. All the bundles grow from a parent
939 * policy rule.
940 */
941struct xfrm_dst {
942 union {
943 struct dst_entry dst;
944 struct rtable rt;
945 struct rt6_info rt6;
946 } u;
947 struct dst_entry *route;
948 struct flow_cache_object flo;
949 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
950 int num_pols, num_xfrms;
951#ifdef CONFIG_XFRM_SUB_POLICY
952 struct flowi *origin;
953 struct xfrm_selector *partner;
954#endif
955 u32 xfrm_genid;
956 u32 policy_genid;
957 u32 route_mtu_cached;
958 u32 child_mtu_cached;
959 u32 route_cookie;
960 u32 path_cookie;
961};
962
963#ifdef CONFIG_XFRM
964static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
965{
966 xfrm_pols_put(xdst->pols, xdst->num_pols);
967 dst_release(xdst->route);
968 if (likely(xdst->u.dst.xfrm))
969 xfrm_state_put(xdst->u.dst.xfrm);
970#ifdef CONFIG_XFRM_SUB_POLICY
971 kfree(xdst->origin);
972 xdst->origin = NULL;
973 kfree(xdst->partner);
974 xdst->partner = NULL;
975#endif
976}
977#endif
978
979void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
980
981struct sec_path {
982 atomic_t refcnt;
983 int len;
984 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
985};
986
987static inline int secpath_exists(struct sk_buff *skb)
988{
989#ifdef CONFIG_XFRM
990 return skb->sp != NULL;
991#else
992 return 0;
993#endif
994}
995
996static inline struct sec_path *
997secpath_get(struct sec_path *sp)
998{
999 if (sp)
1000 atomic_inc(&sp->refcnt);
1001 return sp;
1002}
1003
1004void __secpath_destroy(struct sec_path *sp);
1005
1006static inline void
1007secpath_put(struct sec_path *sp)
1008{
1009 if (sp && atomic_dec_and_test(&sp->refcnt))
1010 __secpath_destroy(sp);
1011}
1012
1013struct sec_path *secpath_dup(struct sec_path *src);
1014
1015static inline void
1016secpath_reset(struct sk_buff *skb)
1017{
1018#ifdef CONFIG_XFRM
1019 secpath_put(skb->sp);
1020 skb->sp = NULL;
1021#endif
1022}
1023
1024static inline int
1025xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1026{
1027 switch (family) {
1028 case AF_INET:
1029 return addr->a4 == 0;
1030 case AF_INET6:
1031 return ipv6_addr_any(&addr->in6);
1032 }
1033 return 0;
1034}
1035
1036static inline int
1037__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1038{
1039 return (tmpl->saddr.a4 &&
1040 tmpl->saddr.a4 != x->props.saddr.a4);
1041}
1042
1043static inline int
1044__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1045{
1046 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1047 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1048}
1049
1050static inline int
1051xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1052{
1053 switch (family) {
1054 case AF_INET:
1055 return __xfrm4_state_addr_cmp(tmpl, x);
1056 case AF_INET6:
1057 return __xfrm6_state_addr_cmp(tmpl, x);
1058 }
1059 return !0;
1060}
1061
1062#ifdef CONFIG_XFRM
1063int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1064 unsigned short family);
1065
1066static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1067 struct sk_buff *skb,
1068 unsigned int family, int reverse)
1069{
1070 struct net *net = dev_net(skb->dev);
1071 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1072
1073 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1074 return __xfrm_policy_check(sk, ndir, skb, family);
1075
1076 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1077 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1078 __xfrm_policy_check(sk, ndir, skb, family);
1079}
1080
1081static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1082{
1083 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1084}
1085
1086static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1087{
1088 return xfrm_policy_check(sk, dir, skb, AF_INET);
1089}
1090
1091static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1092{
1093 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1094}
1095
1096static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1097 struct sk_buff *skb)
1098{
1099 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1100}
1101
1102static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1103 struct sk_buff *skb)
1104{
1105 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1106}
1107
1108int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1109 unsigned int family, int reverse);
1110
1111static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1112 unsigned int family)
1113{
1114 return __xfrm_decode_session(skb, fl, family, 0);
1115}
1116
1117static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1118 struct flowi *fl,
1119 unsigned int family)
1120{
1121 return __xfrm_decode_session(skb, fl, family, 1);
1122}
1123
1124int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1125
1126static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1127{
1128 struct net *net = dev_net(skb->dev);
1129
1130 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1131 (skb_dst(skb)->flags & DST_NOXFRM) ||
1132 __xfrm_route_forward(skb, family);
1133}
1134
1135static inline int xfrm4_route_forward(struct sk_buff *skb)
1136{
1137 return xfrm_route_forward(skb, AF_INET);
1138}
1139
1140static inline int xfrm6_route_forward(struct sk_buff *skb)
1141{
1142 return xfrm_route_forward(skb, AF_INET6);
1143}
1144
1145int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1146
1147static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1148{
1149 sk->sk_policy[0] = NULL;
1150 sk->sk_policy[1] = NULL;
1151 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1152 return __xfrm_sk_clone_policy(sk, osk);
1153 return 0;
1154}
1155
1156int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1157
1158static inline void xfrm_sk_free_policy(struct sock *sk)
1159{
1160 struct xfrm_policy *pol;
1161
1162 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1163 if (unlikely(pol != NULL)) {
1164 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1165 sk->sk_policy[0] = NULL;
1166 }
1167 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1168 if (unlikely(pol != NULL)) {
1169 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1170 sk->sk_policy[1] = NULL;
1171 }
1172}
1173
1174void xfrm_garbage_collect(struct net *net);
1175
1176#else
1177
1178static inline void xfrm_sk_free_policy(struct sock *sk) {}
1179static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1180static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1181static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1182static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1183{
1184 return 1;
1185}
1186static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1187{
1188 return 1;
1189}
1190static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1191{
1192 return 1;
1193}
1194static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1195 struct flowi *fl,
1196 unsigned int family)
1197{
1198 return -ENOSYS;
1199}
1200static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1201 struct sk_buff *skb)
1202{
1203 return 1;
1204}
1205static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1206 struct sk_buff *skb)
1207{
1208 return 1;
1209}
1210static inline void xfrm_garbage_collect(struct net *net)
1211{
1212}
1213#endif
1214
1215static __inline__
1216xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1217{
1218 switch (family){
1219 case AF_INET:
1220 return (xfrm_address_t *)&fl->u.ip4.daddr;
1221 case AF_INET6:
1222 return (xfrm_address_t *)&fl->u.ip6.daddr;
1223 }
1224 return NULL;
1225}
1226
1227static __inline__
1228xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1229{
1230 switch (family){
1231 case AF_INET:
1232 return (xfrm_address_t *)&fl->u.ip4.saddr;
1233 case AF_INET6:
1234 return (xfrm_address_t *)&fl->u.ip6.saddr;
1235 }
1236 return NULL;
1237}
1238
1239static __inline__
1240void xfrm_flowi_addr_get(const struct flowi *fl,
1241 xfrm_address_t *saddr, xfrm_address_t *daddr,
1242 unsigned short family)
1243{
1244 switch(family) {
1245 case AF_INET:
1246 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1247 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1248 break;
1249 case AF_INET6:
1250 saddr->in6 = fl->u.ip6.saddr;
1251 daddr->in6 = fl->u.ip6.daddr;
1252 break;
1253 }
1254}
1255
1256static __inline__ int
1257__xfrm4_state_addr_check(const struct xfrm_state *x,
1258 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1259{
1260 if (daddr->a4 == x->id.daddr.a4 &&
1261 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1262 return 1;
1263 return 0;
1264}
1265
1266static __inline__ int
1267__xfrm6_state_addr_check(const struct xfrm_state *x,
1268 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1269{
1270 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1271 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1272 ipv6_addr_any((struct in6_addr *)saddr) ||
1273 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1274 return 1;
1275 return 0;
1276}
1277
1278static __inline__ int
1279xfrm_state_addr_check(const struct xfrm_state *x,
1280 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1281 unsigned short family)
1282{
1283 switch (family) {
1284 case AF_INET:
1285 return __xfrm4_state_addr_check(x, daddr, saddr);
1286 case AF_INET6:
1287 return __xfrm6_state_addr_check(x, daddr, saddr);
1288 }
1289 return 0;
1290}
1291
1292static __inline__ int
1293xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1294 unsigned short family)
1295{
1296 switch (family) {
1297 case AF_INET:
1298 return __xfrm4_state_addr_check(x,
1299 (const xfrm_address_t *)&fl->u.ip4.daddr,
1300 (const xfrm_address_t *)&fl->u.ip4.saddr);
1301 case AF_INET6:
1302 return __xfrm6_state_addr_check(x,
1303 (const xfrm_address_t *)&fl->u.ip6.daddr,
1304 (const xfrm_address_t *)&fl->u.ip6.saddr);
1305 }
1306 return 0;
1307}
1308
1309static inline int xfrm_state_kern(const struct xfrm_state *x)
1310{
1311 return atomic_read(&x->tunnel_users);
1312}
1313
1314static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1315{
1316 return (!userproto || proto == userproto ||
1317 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1318 proto == IPPROTO_ESP ||
1319 proto == IPPROTO_COMP)));
1320}
1321
1322/*
1323 * xfrm algorithm information
1324 */
1325struct xfrm_algo_aead_info {
1326 char *geniv;
1327 u16 icv_truncbits;
1328};
1329
1330struct xfrm_algo_auth_info {
1331 u16 icv_truncbits;
1332 u16 icv_fullbits;
1333};
1334
1335struct xfrm_algo_encr_info {
1336 char *geniv;
1337 u16 blockbits;
1338 u16 defkeybits;
1339};
1340
1341struct xfrm_algo_comp_info {
1342 u16 threshold;
1343};
1344
1345struct xfrm_algo_desc {
1346 char *name;
1347 char *compat;
1348 u8 available:1;
1349 u8 pfkey_supported:1;
1350 union {
1351 struct xfrm_algo_aead_info aead;
1352 struct xfrm_algo_auth_info auth;
1353 struct xfrm_algo_encr_info encr;
1354 struct xfrm_algo_comp_info comp;
1355 } uinfo;
1356 struct sadb_alg desc;
1357};
1358
1359/* XFRM protocol handlers. */
1360struct xfrm4_protocol {
1361 int (*handler)(struct sk_buff *skb);
1362 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1363 int encap_type);
1364 int (*cb_handler)(struct sk_buff *skb, int err);
1365 int (*err_handler)(struct sk_buff *skb, u32 info);
1366
1367 struct xfrm4_protocol __rcu *next;
1368 int priority;
1369};
1370
1371struct xfrm6_protocol {
1372 int (*handler)(struct sk_buff *skb);
1373 int (*cb_handler)(struct sk_buff *skb, int err);
1374 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1375 u8 type, u8 code, int offset, __be32 info);
1376
1377 struct xfrm6_protocol __rcu *next;
1378 int priority;
1379};
1380
1381/* XFRM tunnel handlers. */
1382struct xfrm_tunnel {
1383 int (*handler)(struct sk_buff *skb);
1384 int (*err_handler)(struct sk_buff *skb, u32 info);
1385
1386 struct xfrm_tunnel __rcu *next;
1387 int priority;
1388};
1389
1390struct xfrm6_tunnel {
1391 int (*handler)(struct sk_buff *skb);
1392 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1393 u8 type, u8 code, int offset, __be32 info);
1394 struct xfrm6_tunnel __rcu *next;
1395 int priority;
1396};
1397
1398void xfrm_init(void);
1399void xfrm4_init(void);
1400int xfrm_state_init(struct net *net);
1401void xfrm_state_fini(struct net *net);
1402void xfrm4_state_init(void);
1403void xfrm4_protocol_init(void);
1404#ifdef CONFIG_XFRM
1405int xfrm6_init(void);
1406void xfrm6_fini(void);
1407int xfrm6_state_init(void);
1408void xfrm6_state_fini(void);
1409int xfrm6_protocol_init(void);
1410void xfrm6_protocol_fini(void);
1411#else
1412static inline int xfrm6_init(void)
1413{
1414 return 0;
1415}
1416static inline void xfrm6_fini(void)
1417{
1418 ;
1419}
1420#endif
1421
1422#ifdef CONFIG_XFRM_STATISTICS
1423int xfrm_proc_init(struct net *net);
1424void xfrm_proc_fini(struct net *net);
1425#endif
1426
1427int xfrm_sysctl_init(struct net *net);
1428#ifdef CONFIG_SYSCTL
1429void xfrm_sysctl_fini(struct net *net);
1430#else
1431static inline void xfrm_sysctl_fini(struct net *net)
1432{
1433}
1434#endif
1435
1436void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1437 struct xfrm_address_filter *filter);
1438int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1439 int (*func)(struct xfrm_state *, int, void*), void *);
1440void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1441struct xfrm_state *xfrm_state_alloc(struct net *net);
1442struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1443 const xfrm_address_t *saddr,
1444 const struct flowi *fl,
1445 struct xfrm_tmpl *tmpl,
1446 struct xfrm_policy *pol, int *err,
1447 unsigned short family);
1448struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1449 xfrm_address_t *daddr,
1450 xfrm_address_t *saddr,
1451 unsigned short family,
1452 u8 mode, u8 proto, u32 reqid);
1453struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1454 unsigned short family);
1455int xfrm_state_check_expire(struct xfrm_state *x);
1456void xfrm_state_insert(struct xfrm_state *x);
1457int xfrm_state_add(struct xfrm_state *x);
1458int xfrm_state_update(struct xfrm_state *x);
1459struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1460 const xfrm_address_t *daddr, __be32 spi,
1461 u8 proto, unsigned short family);
1462struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1463 const xfrm_address_t *daddr,
1464 const xfrm_address_t *saddr,
1465 u8 proto,
1466 unsigned short family);
1467#ifdef CONFIG_XFRM_SUB_POLICY
1468int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1469 unsigned short family, struct net *net);
1470int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1471 unsigned short family);
1472#else
1473static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1474 int n, unsigned short family, struct net *net)
1475{
1476 return -ENOSYS;
1477}
1478
1479static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1480 int n, unsigned short family)
1481{
1482 return -ENOSYS;
1483}
1484#endif
1485
1486struct xfrmk_sadinfo {
1487 u32 sadhcnt; /* current hash bkts */
1488 u32 sadhmcnt; /* max allowed hash bkts */
1489 u32 sadcnt; /* current running count */
1490};
1491
1492struct xfrmk_spdinfo {
1493 u32 incnt;
1494 u32 outcnt;
1495 u32 fwdcnt;
1496 u32 inscnt;
1497 u32 outscnt;
1498 u32 fwdscnt;
1499 u32 spdhcnt;
1500 u32 spdhmcnt;
1501};
1502
1503struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1504int xfrm_state_delete(struct xfrm_state *x);
1505int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1506void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1507void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1508u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1509int xfrm_init_replay(struct xfrm_state *x);
1510int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1511int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1512int xfrm_init_state(struct xfrm_state *x);
1513int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1514int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1515int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1516int xfrm_output_resume(struct sk_buff *skb, int err);
1517int xfrm_output(struct sock *sk, struct sk_buff *skb);
1518int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1519void xfrm_local_error(struct sk_buff *skb, int mtu);
1520int xfrm4_extract_header(struct sk_buff *skb);
1521int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1522int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1523 int encap_type);
1524int xfrm4_transport_finish(struct sk_buff *skb, int async);
1525int xfrm4_rcv(struct sk_buff *skb);
1526
1527static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1528{
1529 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1530 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1531 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1532 return xfrm_input(skb, nexthdr, spi, 0);
1533}
1534
1535int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1536int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1537int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1538int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1539int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1540int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1541int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1542int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1543int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1544void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1545int xfrm6_extract_header(struct sk_buff *skb);
1546int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1547int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1548int xfrm6_transport_finish(struct sk_buff *skb, int async);
1549int xfrm6_rcv(struct sk_buff *skb);
1550int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1551 xfrm_address_t *saddr, u8 proto);
1552void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1553int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1554int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1555int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1556int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1557int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1558__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1559__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1560int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1561int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1562int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1563int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1564int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1565 u8 **prevhdr);
1566
1567#ifdef CONFIG_XFRM
1568int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1569int xfrm_user_policy(struct sock *sk, int optname,
1570 u8 __user *optval, int optlen);
1571#else
1572static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1573{
1574 return -ENOPROTOOPT;
1575}
1576
1577static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1578{
1579 /* should not happen */
1580 kfree_skb(skb);
1581 return 0;
1582}
1583#endif
1584
1585struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1586
1587void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1588int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1589 int (*func)(struct xfrm_policy *, int, int, void*),
1590 void *);
1591void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1592int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1593struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1594 u8 type, int dir,
1595 struct xfrm_selector *sel,
1596 struct xfrm_sec_ctx *ctx, int delete,
1597 int *err);
1598struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1599 u32 id, int delete, int *err);
1600int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1601void xfrm_policy_hash_rebuild(struct net *net);
1602u32 xfrm_get_acqseq(void);
1603int verify_spi_info(u8 proto, u32 min, u32 max);
1604int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1605struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1606 u8 mode, u32 reqid, u8 proto,
1607 const xfrm_address_t *daddr,
1608 const xfrm_address_t *saddr, int create,
1609 unsigned short family);
1610int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1611
1612#ifdef CONFIG_XFRM_MIGRATE
1613int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1614 const struct xfrm_migrate *m, int num_bundles,
1615 const struct xfrm_kmaddress *k);
1616struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1617struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1618 struct xfrm_migrate *m);
1619int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1620 struct xfrm_migrate *m, int num_bundles,
1621 struct xfrm_kmaddress *k, struct net *net);
1622#endif
1623
1624int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1625void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1626int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1627 xfrm_address_t *addr);
1628
1629void xfrm_input_init(void);
1630int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1631
1632void xfrm_probe_algs(void);
1633int xfrm_count_pfkey_auth_supported(void);
1634int xfrm_count_pfkey_enc_supported(void);
1635struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1636struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1637struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1638struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1639struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1640struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1641struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1642struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1643struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1644 int probe);
1645
1646static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1647 const xfrm_address_t *b)
1648{
1649 return ipv6_addr_equal((const struct in6_addr *)a,
1650 (const struct in6_addr *)b);
1651}
1652
1653static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1654 const xfrm_address_t *b,
1655 sa_family_t family)
1656{
1657 switch (family) {
1658 default:
1659 case AF_INET:
1660 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1661 case AF_INET6:
1662 return xfrm6_addr_equal(a, b);
1663 }
1664}
1665
1666static inline int xfrm_policy_id2dir(u32 index)
1667{
1668 return index & 7;
1669}
1670
1671#ifdef CONFIG_XFRM
1672static inline int xfrm_aevent_is_on(struct net *net)
1673{
1674 struct sock *nlsk;
1675 int ret = 0;
1676
1677 rcu_read_lock();
1678 nlsk = rcu_dereference(net->xfrm.nlsk);
1679 if (nlsk)
1680 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1681 rcu_read_unlock();
1682 return ret;
1683}
1684
1685static inline int xfrm_acquire_is_on(struct net *net)
1686{
1687 struct sock *nlsk;
1688 int ret = 0;
1689
1690 rcu_read_lock();
1691 nlsk = rcu_dereference(net->xfrm.nlsk);
1692 if (nlsk)
1693 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1694 rcu_read_unlock();
1695
1696 return ret;
1697}
1698#endif
1699
1700static inline int aead_len(struct xfrm_algo_aead *alg)
1701{
1702 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1703}
1704
1705static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1706{
1707 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1708}
1709
1710static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1711{
1712 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1713}
1714
1715static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1716{
1717 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1718}
1719
1720#ifdef CONFIG_XFRM_MIGRATE
1721static inline int xfrm_replay_clone(struct xfrm_state *x,
1722 struct xfrm_state *orig)
1723{
1724 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1725 GFP_KERNEL);
1726 if (!x->replay_esn)
1727 return -ENOMEM;
1728
1729 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1730 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1731
1732 x->preplay_esn = kmemdup(x->replay_esn,
1733 xfrm_replay_state_esn_len(x->replay_esn),
1734 GFP_KERNEL);
1735 if (!x->preplay_esn) {
1736 kfree(x->replay_esn);
1737 return -ENOMEM;
1738 }
1739
1740 return 0;
1741}
1742
1743static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1744{
1745 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1746}
1747
1748
1749static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1750{
1751 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1752}
1753
1754static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1755{
1756 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1757}
1758
1759static inline void xfrm_states_put(struct xfrm_state **states, int n)
1760{
1761 int i;
1762 for (i = 0; i < n; i++)
1763 xfrm_state_put(*(states + i));
1764}
1765
1766static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1767{
1768 int i;
1769 for (i = 0; i < n; i++)
1770 xfrm_state_delete(*(states + i));
1771}
1772#endif
1773
1774#ifdef CONFIG_XFRM
1775static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1776{
1777 return skb->sp->xvec[skb->sp->len - 1];
1778}
1779#endif
1780
1781static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1782{
1783 if (attrs[XFRMA_MARK])
1784 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1785 else
1786 m->v = m->m = 0;
1787
1788 return m->v & m->m;
1789}
1790
1791static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1792{
1793 int ret = 0;
1794
1795 if (m->m | m->v)
1796 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1797 return ret;
1798}
1799
1800static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1801 unsigned int family)
1802{
1803 bool tunnel = false;
1804
1805 switch(family) {
1806 case AF_INET:
1807 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1808 tunnel = true;
1809 break;
1810 case AF_INET6:
1811 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1812 tunnel = true;
1813 break;
1814 }
1815 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1816 return -EINVAL;
1817
1818 return 0;
1819}
1820#endif /* _NET_XFRM_H */