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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_XFRM_H
3#define _NET_XFRM_H
4
5#include <linux/compiler.h>
6#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/pfkeyv2.h>
12#include <linux/ipsec.h>
13#include <linux/in6.h>
14#include <linux/mutex.h>
15#include <linux/audit.h>
16#include <linux/slab.h>
17#include <linux/refcount.h>
18#include <linux/sockptr.h>
19
20#include <net/sock.h>
21#include <net/dst.h>
22#include <net/ip.h>
23#include <net/route.h>
24#include <net/ipv6.h>
25#include <net/ip6_fib.h>
26#include <net/flow.h>
27#include <net/gro_cells.h>
28
29#include <linux/interrupt.h>
30
31#ifdef CONFIG_XFRM_STATISTICS
32#include <net/snmp.h>
33#endif
34
35#define XFRM_PROTO_ESP 50
36#define XFRM_PROTO_AH 51
37#define XFRM_PROTO_COMP 108
38#define XFRM_PROTO_IPIP 4
39#define XFRM_PROTO_IPV6 41
40#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
41#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
42
43#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
44#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
45#define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51
52#ifdef CONFIG_XFRM_STATISTICS
53#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54#else
55#define XFRM_INC_STATS(net, field) ((void)(net))
56#endif
57
58
59/* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 u8 dying;
124 u8 proto;
125 u32 seq;
126 struct xfrm_address_filter *filter;
127};
128
129struct xfrm_state_offload {
130 struct net_device *dev;
131 struct net_device *real_dev;
132 unsigned long offload_handle;
133 unsigned int num_exthdrs;
134 u8 flags;
135};
136
137struct xfrm_mode {
138 u8 encap;
139 u8 family;
140 u8 flags;
141};
142
143/* Flags for xfrm_mode. */
144enum {
145 XFRM_MODE_FLAG_TUNNEL = 1,
146};
147
148enum xfrm_replay_mode {
149 XFRM_REPLAY_MODE_LEGACY,
150 XFRM_REPLAY_MODE_BMP,
151 XFRM_REPLAY_MODE_ESN,
152};
153
154/* Full description of state of transformer. */
155struct xfrm_state {
156 possible_net_t xs_net;
157 union {
158 struct hlist_node gclist;
159 struct hlist_node bydst;
160 };
161 struct hlist_node bysrc;
162 struct hlist_node byspi;
163 struct hlist_node byseq;
164
165 refcount_t refcnt;
166 spinlock_t lock;
167
168 struct xfrm_id id;
169 struct xfrm_selector sel;
170 struct xfrm_mark mark;
171 u32 if_id;
172 u32 tfcpad;
173
174 u32 genid;
175
176 /* Key manager bits */
177 struct xfrm_state_walk km;
178
179 /* Parameters of this state. */
180 struct {
181 u32 reqid;
182 u8 mode;
183 u8 replay_window;
184 u8 aalgo, ealgo, calgo;
185 u8 flags;
186 u16 family;
187 xfrm_address_t saddr;
188 int header_len;
189 int trailer_len;
190 u32 extra_flags;
191 struct xfrm_mark smark;
192 } props;
193
194 struct xfrm_lifetime_cfg lft;
195
196 /* Data for transformer */
197 struct xfrm_algo_auth *aalg;
198 struct xfrm_algo *ealg;
199 struct xfrm_algo *calg;
200 struct xfrm_algo_aead *aead;
201 const char *geniv;
202
203 /* Data for encapsulator */
204 struct xfrm_encap_tmpl *encap;
205 struct sock __rcu *encap_sk;
206
207 /* Data for care-of address */
208 xfrm_address_t *coaddr;
209
210 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
211 struct xfrm_state *tunnel;
212
213 /* If a tunnel, number of users + 1 */
214 atomic_t tunnel_users;
215
216 /* State for replay detection */
217 struct xfrm_replay_state replay;
218 struct xfrm_replay_state_esn *replay_esn;
219
220 /* Replay detection state at the time we sent the last notification */
221 struct xfrm_replay_state preplay;
222 struct xfrm_replay_state_esn *preplay_esn;
223
224 /* replay detection mode */
225 enum xfrm_replay_mode repl_mode;
226 /* internal flag that only holds state for delayed aevent at the
227 * moment
228 */
229 u32 xflags;
230
231 /* Replay detection notification settings */
232 u32 replay_maxage;
233 u32 replay_maxdiff;
234
235 /* Replay detection notification timer */
236 struct timer_list rtimer;
237
238 /* Statistics */
239 struct xfrm_stats stats;
240
241 struct xfrm_lifetime_cur curlft;
242 struct hrtimer mtimer;
243
244 struct xfrm_state_offload xso;
245
246 /* used to fix curlft->add_time when changing date */
247 long saved_tmo;
248
249 /* Last used time */
250 time64_t lastused;
251
252 struct page_frag xfrag;
253
254 /* Reference to data common to all the instances of this
255 * transformer. */
256 const struct xfrm_type *type;
257 struct xfrm_mode inner_mode;
258 struct xfrm_mode inner_mode_iaf;
259 struct xfrm_mode outer_mode;
260
261 const struct xfrm_type_offload *type_offload;
262
263 /* Security context */
264 struct xfrm_sec_ctx *security;
265
266 /* Private data of this transformer, format is opaque,
267 * interpreted by xfrm_type methods. */
268 void *data;
269};
270
271static inline struct net *xs_net(struct xfrm_state *x)
272{
273 return read_pnet(&x->xs_net);
274}
275
276/* xflags - make enum if more show up */
277#define XFRM_TIME_DEFER 1
278#define XFRM_SOFT_EXPIRE 2
279
280enum {
281 XFRM_STATE_VOID,
282 XFRM_STATE_ACQ,
283 XFRM_STATE_VALID,
284 XFRM_STATE_ERROR,
285 XFRM_STATE_EXPIRED,
286 XFRM_STATE_DEAD
287};
288
289/* callback structure passed from either netlink or pfkey */
290struct km_event {
291 union {
292 u32 hard;
293 u32 proto;
294 u32 byid;
295 u32 aevent;
296 u32 type;
297 } data;
298
299 u32 seq;
300 u32 portid;
301 u32 event;
302 struct net *net;
303};
304
305struct xfrm_if_cb {
306 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
307 unsigned short family);
308};
309
310void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
311void xfrm_if_unregister_cb(void);
312
313struct net_device;
314struct xfrm_type;
315struct xfrm_dst;
316struct xfrm_policy_afinfo {
317 struct dst_ops *dst_ops;
318 struct dst_entry *(*dst_lookup)(struct net *net,
319 int tos, int oif,
320 const xfrm_address_t *saddr,
321 const xfrm_address_t *daddr,
322 u32 mark);
323 int (*get_saddr)(struct net *net, int oif,
324 xfrm_address_t *saddr,
325 xfrm_address_t *daddr,
326 u32 mark);
327 int (*fill_dst)(struct xfrm_dst *xdst,
328 struct net_device *dev,
329 const struct flowi *fl);
330 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
331};
332
333int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
334void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
335void km_policy_notify(struct xfrm_policy *xp, int dir,
336 const struct km_event *c);
337void km_state_notify(struct xfrm_state *x, const struct km_event *c);
338
339struct xfrm_tmpl;
340int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
341 struct xfrm_policy *pol);
342void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
343int __xfrm_state_delete(struct xfrm_state *x);
344
345struct xfrm_state_afinfo {
346 u8 family;
347 u8 proto;
348
349 const struct xfrm_type_offload *type_offload_esp;
350
351 const struct xfrm_type *type_esp;
352 const struct xfrm_type *type_ipip;
353 const struct xfrm_type *type_ipip6;
354 const struct xfrm_type *type_comp;
355 const struct xfrm_type *type_ah;
356 const struct xfrm_type *type_routing;
357 const struct xfrm_type *type_dstopts;
358
359 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
360 int (*transport_finish)(struct sk_buff *skb,
361 int async);
362 void (*local_error)(struct sk_buff *skb, u32 mtu);
363};
364
365int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
366int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
367struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
368struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
369
370struct xfrm_input_afinfo {
371 u8 family;
372 bool is_ipip;
373 int (*callback)(struct sk_buff *skb, u8 protocol,
374 int err);
375};
376
377int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
378int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
379
380void xfrm_flush_gc(void);
381void xfrm_state_delete_tunnel(struct xfrm_state *x);
382
383struct xfrm_type {
384 struct module *owner;
385 u8 proto;
386 u8 flags;
387#define XFRM_TYPE_NON_FRAGMENT 1
388#define XFRM_TYPE_REPLAY_PROT 2
389#define XFRM_TYPE_LOCAL_COADDR 4
390#define XFRM_TYPE_REMOTE_COADDR 8
391
392 int (*init_state)(struct xfrm_state *x);
393 void (*destructor)(struct xfrm_state *);
394 int (*input)(struct xfrm_state *, struct sk_buff *skb);
395 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
396 int (*reject)(struct xfrm_state *, struct sk_buff *,
397 const struct flowi *);
398};
399
400int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
401void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
402
403struct xfrm_type_offload {
404 struct module *owner;
405 u8 proto;
406 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
407 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
408 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
409};
410
411int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
412void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
413
414static inline int xfrm_af2proto(unsigned int family)
415{
416 switch(family) {
417 case AF_INET:
418 return IPPROTO_IPIP;
419 case AF_INET6:
420 return IPPROTO_IPV6;
421 default:
422 return 0;
423 }
424}
425
426static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
427{
428 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
429 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
430 return &x->inner_mode;
431 else
432 return &x->inner_mode_iaf;
433}
434
435struct xfrm_tmpl {
436/* id in template is interpreted as:
437 * daddr - destination of tunnel, may be zero for transport mode.
438 * spi - zero to acquire spi. Not zero if spi is static, then
439 * daddr must be fixed too.
440 * proto - AH/ESP/IPCOMP
441 */
442 struct xfrm_id id;
443
444/* Source address of tunnel. Ignored, if it is not a tunnel. */
445 xfrm_address_t saddr;
446
447 unsigned short encap_family;
448
449 u32 reqid;
450
451/* Mode: transport, tunnel etc. */
452 u8 mode;
453
454/* Sharing mode: unique, this session only, this user only etc. */
455 u8 share;
456
457/* May skip this transfomration if no SA is found */
458 u8 optional;
459
460/* Skip aalgos/ealgos/calgos checks. */
461 u8 allalgs;
462
463/* Bit mask of algos allowed for acquisition */
464 u32 aalgos;
465 u32 ealgos;
466 u32 calgos;
467};
468
469#define XFRM_MAX_DEPTH 6
470#define XFRM_MAX_OFFLOAD_DEPTH 1
471
472struct xfrm_policy_walk_entry {
473 struct list_head all;
474 u8 dead;
475};
476
477struct xfrm_policy_walk {
478 struct xfrm_policy_walk_entry walk;
479 u8 type;
480 u32 seq;
481};
482
483struct xfrm_policy_queue {
484 struct sk_buff_head hold_queue;
485 struct timer_list hold_timer;
486 unsigned long timeout;
487};
488
489struct xfrm_policy {
490 possible_net_t xp_net;
491 struct hlist_node bydst;
492 struct hlist_node byidx;
493
494 /* This lock only affects elements except for entry. */
495 rwlock_t lock;
496 refcount_t refcnt;
497 u32 pos;
498 struct timer_list timer;
499
500 atomic_t genid;
501 u32 priority;
502 u32 index;
503 u32 if_id;
504 struct xfrm_mark mark;
505 struct xfrm_selector selector;
506 struct xfrm_lifetime_cfg lft;
507 struct xfrm_lifetime_cur curlft;
508 struct xfrm_policy_walk_entry walk;
509 struct xfrm_policy_queue polq;
510 bool bydst_reinsert;
511 u8 type;
512 u8 action;
513 u8 flags;
514 u8 xfrm_nr;
515 u16 family;
516 struct xfrm_sec_ctx *security;
517 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
518 struct hlist_node bydst_inexact_list;
519 struct rcu_head rcu;
520};
521
522static inline struct net *xp_net(const struct xfrm_policy *xp)
523{
524 return read_pnet(&xp->xp_net);
525}
526
527struct xfrm_kmaddress {
528 xfrm_address_t local;
529 xfrm_address_t remote;
530 u32 reserved;
531 u16 family;
532};
533
534struct xfrm_migrate {
535 xfrm_address_t old_daddr;
536 xfrm_address_t old_saddr;
537 xfrm_address_t new_daddr;
538 xfrm_address_t new_saddr;
539 u8 proto;
540 u8 mode;
541 u16 reserved;
542 u32 reqid;
543 u16 old_family;
544 u16 new_family;
545};
546
547#define XFRM_KM_TIMEOUT 30
548/* what happened */
549#define XFRM_REPLAY_UPDATE XFRM_AE_CR
550#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
551
552/* default aevent timeout in units of 100ms */
553#define XFRM_AE_ETIME 10
554/* Async Event timer multiplier */
555#define XFRM_AE_ETH_M 10
556/* default seq threshold size */
557#define XFRM_AE_SEQT_SIZE 2
558
559struct xfrm_mgr {
560 struct list_head list;
561 int (*notify)(struct xfrm_state *x, const struct km_event *c);
562 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
563 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
564 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
565 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
566 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
567 int (*migrate)(const struct xfrm_selector *sel,
568 u8 dir, u8 type,
569 const struct xfrm_migrate *m,
570 int num_bundles,
571 const struct xfrm_kmaddress *k,
572 const struct xfrm_encap_tmpl *encap);
573 bool (*is_alive)(const struct km_event *c);
574};
575
576int xfrm_register_km(struct xfrm_mgr *km);
577int xfrm_unregister_km(struct xfrm_mgr *km);
578
579struct xfrm_tunnel_skb_cb {
580 union {
581 struct inet_skb_parm h4;
582 struct inet6_skb_parm h6;
583 } header;
584
585 union {
586 struct ip_tunnel *ip4;
587 struct ip6_tnl *ip6;
588 } tunnel;
589};
590
591#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
592
593/*
594 * This structure is used for the duration where packets are being
595 * transformed by IPsec. As soon as the packet leaves IPsec the
596 * area beyond the generic IP part may be overwritten.
597 */
598struct xfrm_skb_cb {
599 struct xfrm_tunnel_skb_cb header;
600
601 /* Sequence number for replay protection. */
602 union {
603 struct {
604 __u32 low;
605 __u32 hi;
606 } output;
607 struct {
608 __be32 low;
609 __be32 hi;
610 } input;
611 } seq;
612};
613
614#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
615
616/*
617 * This structure is used by the afinfo prepare_input/prepare_output functions
618 * to transmit header information to the mode input/output functions.
619 */
620struct xfrm_mode_skb_cb {
621 struct xfrm_tunnel_skb_cb header;
622
623 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
624 __be16 id;
625 __be16 frag_off;
626
627 /* IP header length (excluding options or extension headers). */
628 u8 ihl;
629
630 /* TOS for IPv4, class for IPv6. */
631 u8 tos;
632
633 /* TTL for IPv4, hop limitfor IPv6. */
634 u8 ttl;
635
636 /* Protocol for IPv4, NH for IPv6. */
637 u8 protocol;
638
639 /* Option length for IPv4, zero for IPv6. */
640 u8 optlen;
641
642 /* Used by IPv6 only, zero for IPv4. */
643 u8 flow_lbl[3];
644};
645
646#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
647
648/*
649 * This structure is used by the input processing to locate the SPI and
650 * related information.
651 */
652struct xfrm_spi_skb_cb {
653 struct xfrm_tunnel_skb_cb header;
654
655 unsigned int daddroff;
656 unsigned int family;
657 __be32 seq;
658};
659
660#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
661
662#ifdef CONFIG_AUDITSYSCALL
663static inline struct audit_buffer *xfrm_audit_start(const char *op)
664{
665 struct audit_buffer *audit_buf = NULL;
666
667 if (audit_enabled == AUDIT_OFF)
668 return NULL;
669 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
670 AUDIT_MAC_IPSEC_EVENT);
671 if (audit_buf == NULL)
672 return NULL;
673 audit_log_format(audit_buf, "op=%s", op);
674 return audit_buf;
675}
676
677static inline void xfrm_audit_helper_usrinfo(bool task_valid,
678 struct audit_buffer *audit_buf)
679{
680 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
681 audit_get_loginuid(current) :
682 INVALID_UID);
683 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
684 AUDIT_SID_UNSET;
685
686 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
687 audit_log_task_context(audit_buf);
688}
689
690void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
691void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
692 bool task_valid);
693void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
694void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
695void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
696 struct sk_buff *skb);
697void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
698 __be32 net_seq);
699void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
700void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
701 __be32 net_seq);
702void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
703 u8 proto);
704#else
705
706static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
707 bool task_valid)
708{
709}
710
711static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
712 bool task_valid)
713{
714}
715
716static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
717 bool task_valid)
718{
719}
720
721static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
722 bool task_valid)
723{
724}
725
726static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
727 struct sk_buff *skb)
728{
729}
730
731static inline void xfrm_audit_state_replay(struct xfrm_state *x,
732 struct sk_buff *skb, __be32 net_seq)
733{
734}
735
736static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
737 u16 family)
738{
739}
740
741static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
742 __be32 net_spi, __be32 net_seq)
743{
744}
745
746static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
747 struct sk_buff *skb, u8 proto)
748{
749}
750#endif /* CONFIG_AUDITSYSCALL */
751
752static inline void xfrm_pol_hold(struct xfrm_policy *policy)
753{
754 if (likely(policy != NULL))
755 refcount_inc(&policy->refcnt);
756}
757
758void xfrm_policy_destroy(struct xfrm_policy *policy);
759
760static inline void xfrm_pol_put(struct xfrm_policy *policy)
761{
762 if (refcount_dec_and_test(&policy->refcnt))
763 xfrm_policy_destroy(policy);
764}
765
766static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
767{
768 int i;
769 for (i = npols - 1; i >= 0; --i)
770 xfrm_pol_put(pols[i]);
771}
772
773void __xfrm_state_destroy(struct xfrm_state *, bool);
774
775static inline void __xfrm_state_put(struct xfrm_state *x)
776{
777 refcount_dec(&x->refcnt);
778}
779
780static inline void xfrm_state_put(struct xfrm_state *x)
781{
782 if (refcount_dec_and_test(&x->refcnt))
783 __xfrm_state_destroy(x, false);
784}
785
786static inline void xfrm_state_put_sync(struct xfrm_state *x)
787{
788 if (refcount_dec_and_test(&x->refcnt))
789 __xfrm_state_destroy(x, true);
790}
791
792static inline void xfrm_state_hold(struct xfrm_state *x)
793{
794 refcount_inc(&x->refcnt);
795}
796
797static inline bool addr_match(const void *token1, const void *token2,
798 unsigned int prefixlen)
799{
800 const __be32 *a1 = token1;
801 const __be32 *a2 = token2;
802 unsigned int pdw;
803 unsigned int pbi;
804
805 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
806 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
807
808 if (pdw)
809 if (memcmp(a1, a2, pdw << 2))
810 return false;
811
812 if (pbi) {
813 __be32 mask;
814
815 mask = htonl((0xffffffff) << (32 - pbi));
816
817 if ((a1[pdw] ^ a2[pdw]) & mask)
818 return false;
819 }
820
821 return true;
822}
823
824static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
825{
826 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
827 if (sizeof(long) == 4 && prefixlen == 0)
828 return true;
829 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
830}
831
832static __inline__
833__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
834{
835 __be16 port;
836 switch(fl->flowi_proto) {
837 case IPPROTO_TCP:
838 case IPPROTO_UDP:
839 case IPPROTO_UDPLITE:
840 case IPPROTO_SCTP:
841 port = uli->ports.sport;
842 break;
843 case IPPROTO_ICMP:
844 case IPPROTO_ICMPV6:
845 port = htons(uli->icmpt.type);
846 break;
847 case IPPROTO_MH:
848 port = htons(uli->mht.type);
849 break;
850 case IPPROTO_GRE:
851 port = htons(ntohl(uli->gre_key) >> 16);
852 break;
853 default:
854 port = 0; /*XXX*/
855 }
856 return port;
857}
858
859static __inline__
860__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
861{
862 __be16 port;
863 switch(fl->flowi_proto) {
864 case IPPROTO_TCP:
865 case IPPROTO_UDP:
866 case IPPROTO_UDPLITE:
867 case IPPROTO_SCTP:
868 port = uli->ports.dport;
869 break;
870 case IPPROTO_ICMP:
871 case IPPROTO_ICMPV6:
872 port = htons(uli->icmpt.code);
873 break;
874 case IPPROTO_GRE:
875 port = htons(ntohl(uli->gre_key) & 0xffff);
876 break;
877 default:
878 port = 0; /*XXX*/
879 }
880 return port;
881}
882
883bool xfrm_selector_match(const struct xfrm_selector *sel,
884 const struct flowi *fl, unsigned short family);
885
886#ifdef CONFIG_SECURITY_NETWORK_XFRM
887/* If neither has a context --> match
888 * Otherwise, both must have a context and the sids, doi, alg must match
889 */
890static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
891{
892 return ((!s1 && !s2) ||
893 (s1 && s2 &&
894 (s1->ctx_sid == s2->ctx_sid) &&
895 (s1->ctx_doi == s2->ctx_doi) &&
896 (s1->ctx_alg == s2->ctx_alg)));
897}
898#else
899static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
900{
901 return true;
902}
903#endif
904
905/* A struct encoding bundle of transformations to apply to some set of flow.
906 *
907 * xdst->child points to the next element of bundle.
908 * dst->xfrm points to an instanse of transformer.
909 *
910 * Due to unfortunate limitations of current routing cache, which we
911 * have no time to fix, it mirrors struct rtable and bound to the same
912 * routing key, including saddr,daddr. However, we can have many of
913 * bundles differing by session id. All the bundles grow from a parent
914 * policy rule.
915 */
916struct xfrm_dst {
917 union {
918 struct dst_entry dst;
919 struct rtable rt;
920 struct rt6_info rt6;
921 } u;
922 struct dst_entry *route;
923 struct dst_entry *child;
924 struct dst_entry *path;
925 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
926 int num_pols, num_xfrms;
927 u32 xfrm_genid;
928 u32 policy_genid;
929 u32 route_mtu_cached;
930 u32 child_mtu_cached;
931 u32 route_cookie;
932 u32 path_cookie;
933};
934
935static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
936{
937#ifdef CONFIG_XFRM
938 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
939 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
940
941 return xdst->path;
942 }
943#endif
944 return (struct dst_entry *) dst;
945}
946
947static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
948{
949#ifdef CONFIG_XFRM
950 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
951 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
952 return xdst->child;
953 }
954#endif
955 return NULL;
956}
957
958#ifdef CONFIG_XFRM
959static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
960{
961 xdst->child = child;
962}
963
964static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
965{
966 xfrm_pols_put(xdst->pols, xdst->num_pols);
967 dst_release(xdst->route);
968 if (likely(xdst->u.dst.xfrm))
969 xfrm_state_put(xdst->u.dst.xfrm);
970}
971#endif
972
973void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
974
975struct xfrm_if_parms {
976 int link; /* ifindex of underlying L2 interface */
977 u32 if_id; /* interface identifyer */
978};
979
980struct xfrm_if {
981 struct xfrm_if __rcu *next; /* next interface in list */
982 struct net_device *dev; /* virtual device associated with interface */
983 struct net *net; /* netns for packet i/o */
984 struct xfrm_if_parms p; /* interface parms */
985
986 struct gro_cells gro_cells;
987};
988
989struct xfrm_offload {
990 /* Output sequence number for replay protection on offloading. */
991 struct {
992 __u32 low;
993 __u32 hi;
994 } seq;
995
996 __u32 flags;
997#define SA_DELETE_REQ 1
998#define CRYPTO_DONE 2
999#define CRYPTO_NEXT_DONE 4
1000#define CRYPTO_FALLBACK 8
1001#define XFRM_GSO_SEGMENT 16
1002#define XFRM_GRO 32
1003#define XFRM_ESP_NO_TRAILER 64
1004#define XFRM_DEV_RESUME 128
1005#define XFRM_XMIT 256
1006
1007 __u32 status;
1008#define CRYPTO_SUCCESS 1
1009#define CRYPTO_GENERIC_ERROR 2
1010#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1011#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1012#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1013#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1014#define CRYPTO_INVALID_PACKET_SYNTAX 64
1015#define CRYPTO_INVALID_PROTOCOL 128
1016
1017 __u8 proto;
1018 __u8 inner_ipproto;
1019};
1020
1021struct sec_path {
1022 int len;
1023 int olen;
1024
1025 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1026 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1027};
1028
1029struct sec_path *secpath_set(struct sk_buff *skb);
1030
1031static inline void
1032secpath_reset(struct sk_buff *skb)
1033{
1034#ifdef CONFIG_XFRM
1035 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1036#endif
1037}
1038
1039static inline int
1040xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1041{
1042 switch (family) {
1043 case AF_INET:
1044 return addr->a4 == 0;
1045 case AF_INET6:
1046 return ipv6_addr_any(&addr->in6);
1047 }
1048 return 0;
1049}
1050
1051static inline int
1052__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1053{
1054 return (tmpl->saddr.a4 &&
1055 tmpl->saddr.a4 != x->props.saddr.a4);
1056}
1057
1058static inline int
1059__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1060{
1061 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1062 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1063}
1064
1065static inline int
1066xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1067{
1068 switch (family) {
1069 case AF_INET:
1070 return __xfrm4_state_addr_cmp(tmpl, x);
1071 case AF_INET6:
1072 return __xfrm6_state_addr_cmp(tmpl, x);
1073 }
1074 return !0;
1075}
1076
1077#ifdef CONFIG_XFRM
1078int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1079 unsigned short family);
1080
1081static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1082 struct sk_buff *skb,
1083 unsigned int family, int reverse)
1084{
1085 struct net *net = dev_net(skb->dev);
1086 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1087
1088 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1089 return __xfrm_policy_check(sk, ndir, skb, family);
1090
1091 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1092 (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) ||
1093 __xfrm_policy_check(sk, ndir, skb, family);
1094}
1095
1096static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1097{
1098 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1099}
1100
1101static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1102{
1103 return xfrm_policy_check(sk, dir, skb, AF_INET);
1104}
1105
1106static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1107{
1108 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1109}
1110
1111static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1112 struct sk_buff *skb)
1113{
1114 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1115}
1116
1117static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1118 struct sk_buff *skb)
1119{
1120 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1121}
1122
1123int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1124 unsigned int family, int reverse);
1125
1126static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1127 unsigned int family)
1128{
1129 return __xfrm_decode_session(skb, fl, family, 0);
1130}
1131
1132static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1133 struct flowi *fl,
1134 unsigned int family)
1135{
1136 return __xfrm_decode_session(skb, fl, family, 1);
1137}
1138
1139int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1140
1141static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1142{
1143 struct net *net = dev_net(skb->dev);
1144
1145 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1146 (skb_dst(skb)->flags & DST_NOXFRM) ||
1147 __xfrm_route_forward(skb, family);
1148}
1149
1150static inline int xfrm4_route_forward(struct sk_buff *skb)
1151{
1152 return xfrm_route_forward(skb, AF_INET);
1153}
1154
1155static inline int xfrm6_route_forward(struct sk_buff *skb)
1156{
1157 return xfrm_route_forward(skb, AF_INET6);
1158}
1159
1160int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1161
1162static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1163{
1164 sk->sk_policy[0] = NULL;
1165 sk->sk_policy[1] = NULL;
1166 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1167 return __xfrm_sk_clone_policy(sk, osk);
1168 return 0;
1169}
1170
1171int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1172
1173static inline void xfrm_sk_free_policy(struct sock *sk)
1174{
1175 struct xfrm_policy *pol;
1176
1177 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1178 if (unlikely(pol != NULL)) {
1179 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1180 sk->sk_policy[0] = NULL;
1181 }
1182 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1183 if (unlikely(pol != NULL)) {
1184 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1185 sk->sk_policy[1] = NULL;
1186 }
1187}
1188
1189#else
1190
1191static inline void xfrm_sk_free_policy(struct sock *sk) {}
1192static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1193static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1194static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1195static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1196{
1197 return 1;
1198}
1199static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1200{
1201 return 1;
1202}
1203static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1204{
1205 return 1;
1206}
1207static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1208 struct flowi *fl,
1209 unsigned int family)
1210{
1211 return -ENOSYS;
1212}
1213static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1214 struct sk_buff *skb)
1215{
1216 return 1;
1217}
1218static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1219 struct sk_buff *skb)
1220{
1221 return 1;
1222}
1223#endif
1224
1225static __inline__
1226xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1227{
1228 switch (family){
1229 case AF_INET:
1230 return (xfrm_address_t *)&fl->u.ip4.daddr;
1231 case AF_INET6:
1232 return (xfrm_address_t *)&fl->u.ip6.daddr;
1233 }
1234 return NULL;
1235}
1236
1237static __inline__
1238xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1239{
1240 switch (family){
1241 case AF_INET:
1242 return (xfrm_address_t *)&fl->u.ip4.saddr;
1243 case AF_INET6:
1244 return (xfrm_address_t *)&fl->u.ip6.saddr;
1245 }
1246 return NULL;
1247}
1248
1249static __inline__
1250void xfrm_flowi_addr_get(const struct flowi *fl,
1251 xfrm_address_t *saddr, xfrm_address_t *daddr,
1252 unsigned short family)
1253{
1254 switch(family) {
1255 case AF_INET:
1256 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1257 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1258 break;
1259 case AF_INET6:
1260 saddr->in6 = fl->u.ip6.saddr;
1261 daddr->in6 = fl->u.ip6.daddr;
1262 break;
1263 }
1264}
1265
1266static __inline__ int
1267__xfrm4_state_addr_check(const struct xfrm_state *x,
1268 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1269{
1270 if (daddr->a4 == x->id.daddr.a4 &&
1271 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1272 return 1;
1273 return 0;
1274}
1275
1276static __inline__ int
1277__xfrm6_state_addr_check(const struct xfrm_state *x,
1278 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1279{
1280 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1281 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1282 ipv6_addr_any((struct in6_addr *)saddr) ||
1283 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1284 return 1;
1285 return 0;
1286}
1287
1288static __inline__ int
1289xfrm_state_addr_check(const struct xfrm_state *x,
1290 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1291 unsigned short family)
1292{
1293 switch (family) {
1294 case AF_INET:
1295 return __xfrm4_state_addr_check(x, daddr, saddr);
1296 case AF_INET6:
1297 return __xfrm6_state_addr_check(x, daddr, saddr);
1298 }
1299 return 0;
1300}
1301
1302static __inline__ int
1303xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1304 unsigned short family)
1305{
1306 switch (family) {
1307 case AF_INET:
1308 return __xfrm4_state_addr_check(x,
1309 (const xfrm_address_t *)&fl->u.ip4.daddr,
1310 (const xfrm_address_t *)&fl->u.ip4.saddr);
1311 case AF_INET6:
1312 return __xfrm6_state_addr_check(x,
1313 (const xfrm_address_t *)&fl->u.ip6.daddr,
1314 (const xfrm_address_t *)&fl->u.ip6.saddr);
1315 }
1316 return 0;
1317}
1318
1319static inline int xfrm_state_kern(const struct xfrm_state *x)
1320{
1321 return atomic_read(&x->tunnel_users);
1322}
1323
1324static inline bool xfrm_id_proto_valid(u8 proto)
1325{
1326 switch (proto) {
1327 case IPPROTO_AH:
1328 case IPPROTO_ESP:
1329 case IPPROTO_COMP:
1330#if IS_ENABLED(CONFIG_IPV6)
1331 case IPPROTO_ROUTING:
1332 case IPPROTO_DSTOPTS:
1333#endif
1334 return true;
1335 default:
1336 return false;
1337 }
1338}
1339
1340/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1341static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1342{
1343 return (!userproto || proto == userproto ||
1344 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1345 proto == IPPROTO_ESP ||
1346 proto == IPPROTO_COMP)));
1347}
1348
1349/*
1350 * xfrm algorithm information
1351 */
1352struct xfrm_algo_aead_info {
1353 char *geniv;
1354 u16 icv_truncbits;
1355};
1356
1357struct xfrm_algo_auth_info {
1358 u16 icv_truncbits;
1359 u16 icv_fullbits;
1360};
1361
1362struct xfrm_algo_encr_info {
1363 char *geniv;
1364 u16 blockbits;
1365 u16 defkeybits;
1366};
1367
1368struct xfrm_algo_comp_info {
1369 u16 threshold;
1370};
1371
1372struct xfrm_algo_desc {
1373 char *name;
1374 char *compat;
1375 u8 available:1;
1376 u8 pfkey_supported:1;
1377 union {
1378 struct xfrm_algo_aead_info aead;
1379 struct xfrm_algo_auth_info auth;
1380 struct xfrm_algo_encr_info encr;
1381 struct xfrm_algo_comp_info comp;
1382 } uinfo;
1383 struct sadb_alg desc;
1384};
1385
1386/* XFRM protocol handlers. */
1387struct xfrm4_protocol {
1388 int (*handler)(struct sk_buff *skb);
1389 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1390 int encap_type);
1391 int (*cb_handler)(struct sk_buff *skb, int err);
1392 int (*err_handler)(struct sk_buff *skb, u32 info);
1393
1394 struct xfrm4_protocol __rcu *next;
1395 int priority;
1396};
1397
1398struct xfrm6_protocol {
1399 int (*handler)(struct sk_buff *skb);
1400 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1401 int encap_type);
1402 int (*cb_handler)(struct sk_buff *skb, int err);
1403 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1404 u8 type, u8 code, int offset, __be32 info);
1405
1406 struct xfrm6_protocol __rcu *next;
1407 int priority;
1408};
1409
1410/* XFRM tunnel handlers. */
1411struct xfrm_tunnel {
1412 int (*handler)(struct sk_buff *skb);
1413 int (*cb_handler)(struct sk_buff *skb, int err);
1414 int (*err_handler)(struct sk_buff *skb, u32 info);
1415
1416 struct xfrm_tunnel __rcu *next;
1417 int priority;
1418};
1419
1420struct xfrm6_tunnel {
1421 int (*handler)(struct sk_buff *skb);
1422 int (*cb_handler)(struct sk_buff *skb, int err);
1423 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1424 u8 type, u8 code, int offset, __be32 info);
1425 struct xfrm6_tunnel __rcu *next;
1426 int priority;
1427};
1428
1429void xfrm_init(void);
1430void xfrm4_init(void);
1431int xfrm_state_init(struct net *net);
1432void xfrm_state_fini(struct net *net);
1433void xfrm4_state_init(void);
1434void xfrm4_protocol_init(void);
1435#ifdef CONFIG_XFRM
1436int xfrm6_init(void);
1437void xfrm6_fini(void);
1438int xfrm6_state_init(void);
1439void xfrm6_state_fini(void);
1440int xfrm6_protocol_init(void);
1441void xfrm6_protocol_fini(void);
1442#else
1443static inline int xfrm6_init(void)
1444{
1445 return 0;
1446}
1447static inline void xfrm6_fini(void)
1448{
1449 ;
1450}
1451#endif
1452
1453#ifdef CONFIG_XFRM_STATISTICS
1454int xfrm_proc_init(struct net *net);
1455void xfrm_proc_fini(struct net *net);
1456#endif
1457
1458int xfrm_sysctl_init(struct net *net);
1459#ifdef CONFIG_SYSCTL
1460void xfrm_sysctl_fini(struct net *net);
1461#else
1462static inline void xfrm_sysctl_fini(struct net *net)
1463{
1464}
1465#endif
1466
1467void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1468 struct xfrm_address_filter *filter);
1469int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1470 int (*func)(struct xfrm_state *, int, void*), void *);
1471void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1472struct xfrm_state *xfrm_state_alloc(struct net *net);
1473void xfrm_state_free(struct xfrm_state *x);
1474struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1475 const xfrm_address_t *saddr,
1476 const struct flowi *fl,
1477 struct xfrm_tmpl *tmpl,
1478 struct xfrm_policy *pol, int *err,
1479 unsigned short family, u32 if_id);
1480struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1481 xfrm_address_t *daddr,
1482 xfrm_address_t *saddr,
1483 unsigned short family,
1484 u8 mode, u8 proto, u32 reqid);
1485struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1486 unsigned short family);
1487int xfrm_state_check_expire(struct xfrm_state *x);
1488void xfrm_state_insert(struct xfrm_state *x);
1489int xfrm_state_add(struct xfrm_state *x);
1490int xfrm_state_update(struct xfrm_state *x);
1491struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1492 const xfrm_address_t *daddr, __be32 spi,
1493 u8 proto, unsigned short family);
1494struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1495 const xfrm_address_t *daddr,
1496 const xfrm_address_t *saddr,
1497 u8 proto,
1498 unsigned short family);
1499#ifdef CONFIG_XFRM_SUB_POLICY
1500void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1501 unsigned short family);
1502void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1503 unsigned short family);
1504#else
1505static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1506 int n, unsigned short family)
1507{
1508}
1509
1510static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1511 int n, unsigned short family)
1512{
1513}
1514#endif
1515
1516struct xfrmk_sadinfo {
1517 u32 sadhcnt; /* current hash bkts */
1518 u32 sadhmcnt; /* max allowed hash bkts */
1519 u32 sadcnt; /* current running count */
1520};
1521
1522struct xfrmk_spdinfo {
1523 u32 incnt;
1524 u32 outcnt;
1525 u32 fwdcnt;
1526 u32 inscnt;
1527 u32 outscnt;
1528 u32 fwdscnt;
1529 u32 spdhcnt;
1530 u32 spdhmcnt;
1531};
1532
1533struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1534int xfrm_state_delete(struct xfrm_state *x);
1535int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1536int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1537void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1538void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1539u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1540int xfrm_init_replay(struct xfrm_state *x);
1541u32 __xfrm_state_mtu(struct xfrm_state *x, int mtu);
1542u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1543int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1544int xfrm_init_state(struct xfrm_state *x);
1545int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1546int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1547int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1548 int (*finish)(struct net *, struct sock *,
1549 struct sk_buff *));
1550int xfrm_trans_queue(struct sk_buff *skb,
1551 int (*finish)(struct net *, struct sock *,
1552 struct sk_buff *));
1553int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1554int xfrm_output(struct sock *sk, struct sk_buff *skb);
1555
1556#if IS_ENABLED(CONFIG_NET_PKTGEN)
1557int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1558#endif
1559
1560void xfrm_local_error(struct sk_buff *skb, int mtu);
1561int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1562int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1563 int encap_type);
1564int xfrm4_transport_finish(struct sk_buff *skb, int async);
1565int xfrm4_rcv(struct sk_buff *skb);
1566
1567static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1568{
1569 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1570 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1571 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1572 return xfrm_input(skb, nexthdr, spi, 0);
1573}
1574
1575int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1576int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1577int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1578int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1579int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1580void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1581int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1582int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1583 struct ip6_tnl *t);
1584int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1585 int encap_type);
1586int xfrm6_transport_finish(struct sk_buff *skb, int async);
1587int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1588int xfrm6_rcv(struct sk_buff *skb);
1589int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1590 xfrm_address_t *saddr, u8 proto);
1591void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1592int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1593int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1594int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1595int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1596__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1597__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1598int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1599
1600#ifdef CONFIG_XFRM
1601void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1602int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1603int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1604int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1605 int optlen);
1606#else
1607static inline int xfrm_user_policy(struct sock *sk, int optname,
1608 sockptr_t optval, int optlen)
1609{
1610 return -ENOPROTOOPT;
1611}
1612#endif
1613
1614struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1615 const xfrm_address_t *saddr,
1616 const xfrm_address_t *daddr,
1617 int family, u32 mark);
1618
1619struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1620
1621void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1622int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1623 int (*func)(struct xfrm_policy *, int, int, void*),
1624 void *);
1625void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1626int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1627struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1628 const struct xfrm_mark *mark,
1629 u32 if_id, u8 type, int dir,
1630 struct xfrm_selector *sel,
1631 struct xfrm_sec_ctx *ctx, int delete,
1632 int *err);
1633struct xfrm_policy *xfrm_policy_byid(struct net *net,
1634 const struct xfrm_mark *mark, u32 if_id,
1635 u8 type, int dir, u32 id, int delete,
1636 int *err);
1637int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1638void xfrm_policy_hash_rebuild(struct net *net);
1639u32 xfrm_get_acqseq(void);
1640int verify_spi_info(u8 proto, u32 min, u32 max);
1641int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1642struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1643 u8 mode, u32 reqid, u32 if_id, u8 proto,
1644 const xfrm_address_t *daddr,
1645 const xfrm_address_t *saddr, int create,
1646 unsigned short family);
1647int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1648
1649#ifdef CONFIG_XFRM_MIGRATE
1650int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1651 const struct xfrm_migrate *m, int num_bundles,
1652 const struct xfrm_kmaddress *k,
1653 const struct xfrm_encap_tmpl *encap);
1654struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1655struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1656 struct xfrm_migrate *m,
1657 struct xfrm_encap_tmpl *encap);
1658int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1659 struct xfrm_migrate *m, int num_bundles,
1660 struct xfrm_kmaddress *k, struct net *net,
1661 struct xfrm_encap_tmpl *encap);
1662#endif
1663
1664int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1665void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1666int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1667 xfrm_address_t *addr);
1668
1669void xfrm_input_init(void);
1670int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1671
1672void xfrm_probe_algs(void);
1673int xfrm_count_pfkey_auth_supported(void);
1674int xfrm_count_pfkey_enc_supported(void);
1675struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1676struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1677struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1678struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1679struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1680struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1681struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1682struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1683struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1684 int probe);
1685
1686static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1687 const xfrm_address_t *b)
1688{
1689 return ipv6_addr_equal((const struct in6_addr *)a,
1690 (const struct in6_addr *)b);
1691}
1692
1693static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1694 const xfrm_address_t *b,
1695 sa_family_t family)
1696{
1697 switch (family) {
1698 default:
1699 case AF_INET:
1700 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1701 case AF_INET6:
1702 return xfrm6_addr_equal(a, b);
1703 }
1704}
1705
1706static inline int xfrm_policy_id2dir(u32 index)
1707{
1708 return index & 7;
1709}
1710
1711#ifdef CONFIG_XFRM
1712void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1713int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1714void xfrm_replay_notify(struct xfrm_state *x, int event);
1715int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1716int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1717
1718static inline int xfrm_aevent_is_on(struct net *net)
1719{
1720 struct sock *nlsk;
1721 int ret = 0;
1722
1723 rcu_read_lock();
1724 nlsk = rcu_dereference(net->xfrm.nlsk);
1725 if (nlsk)
1726 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1727 rcu_read_unlock();
1728 return ret;
1729}
1730
1731static inline int xfrm_acquire_is_on(struct net *net)
1732{
1733 struct sock *nlsk;
1734 int ret = 0;
1735
1736 rcu_read_lock();
1737 nlsk = rcu_dereference(net->xfrm.nlsk);
1738 if (nlsk)
1739 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1740 rcu_read_unlock();
1741
1742 return ret;
1743}
1744#endif
1745
1746static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1747{
1748 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1749}
1750
1751static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1752{
1753 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1754}
1755
1756static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1757{
1758 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1759}
1760
1761static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1762{
1763 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1764}
1765
1766#ifdef CONFIG_XFRM_MIGRATE
1767static inline int xfrm_replay_clone(struct xfrm_state *x,
1768 struct xfrm_state *orig)
1769{
1770
1771 x->replay_esn = kmemdup(orig->replay_esn,
1772 xfrm_replay_state_esn_len(orig->replay_esn),
1773 GFP_KERNEL);
1774 if (!x->replay_esn)
1775 return -ENOMEM;
1776 x->preplay_esn = kmemdup(orig->preplay_esn,
1777 xfrm_replay_state_esn_len(orig->preplay_esn),
1778 GFP_KERNEL);
1779 if (!x->preplay_esn)
1780 return -ENOMEM;
1781
1782 return 0;
1783}
1784
1785static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1786{
1787 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1788}
1789
1790
1791static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1792{
1793 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1794}
1795
1796static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1797{
1798 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1799}
1800
1801static inline void xfrm_states_put(struct xfrm_state **states, int n)
1802{
1803 int i;
1804 for (i = 0; i < n; i++)
1805 xfrm_state_put(*(states + i));
1806}
1807
1808static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1809{
1810 int i;
1811 for (i = 0; i < n; i++)
1812 xfrm_state_delete(*(states + i));
1813}
1814#endif
1815
1816#ifdef CONFIG_XFRM
1817static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1818{
1819 struct sec_path *sp = skb_sec_path(skb);
1820
1821 return sp->xvec[sp->len - 1];
1822}
1823#endif
1824
1825static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1826{
1827#ifdef CONFIG_XFRM
1828 struct sec_path *sp = skb_sec_path(skb);
1829
1830 if (!sp || !sp->olen || sp->len != sp->olen)
1831 return NULL;
1832
1833 return &sp->ovec[sp->olen - 1];
1834#else
1835 return NULL;
1836#endif
1837}
1838
1839void __init xfrm_dev_init(void);
1840
1841#ifdef CONFIG_XFRM_OFFLOAD
1842void xfrm_dev_resume(struct sk_buff *skb);
1843void xfrm_dev_backlog(struct softnet_data *sd);
1844struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1845int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1846 struct xfrm_user_offload *xuo);
1847bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1848
1849static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1850{
1851 struct xfrm_state_offload *xso = &x->xso;
1852
1853 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1854 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1855}
1856
1857static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1858{
1859 struct xfrm_state *x = dst->xfrm;
1860 struct xfrm_dst *xdst;
1861
1862 if (!x || !x->type_offload)
1863 return false;
1864
1865 xdst = (struct xfrm_dst *) dst;
1866 if (!x->xso.offload_handle && !xdst->child->xfrm)
1867 return true;
1868 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1869 !xdst->child->xfrm)
1870 return true;
1871
1872 return false;
1873}
1874
1875static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1876{
1877 struct xfrm_state_offload *xso = &x->xso;
1878
1879 if (xso->dev)
1880 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1881}
1882
1883static inline void xfrm_dev_state_free(struct xfrm_state *x)
1884{
1885 struct xfrm_state_offload *xso = &x->xso;
1886 struct net_device *dev = xso->dev;
1887
1888 if (dev && dev->xfrmdev_ops) {
1889 if (dev->xfrmdev_ops->xdo_dev_state_free)
1890 dev->xfrmdev_ops->xdo_dev_state_free(x);
1891 xso->dev = NULL;
1892 dev_put(dev);
1893 }
1894}
1895#else
1896static inline void xfrm_dev_resume(struct sk_buff *skb)
1897{
1898}
1899
1900static inline void xfrm_dev_backlog(struct softnet_data *sd)
1901{
1902}
1903
1904static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1905{
1906 return skb;
1907}
1908
1909static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1910{
1911 return 0;
1912}
1913
1914static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1915{
1916}
1917
1918static inline void xfrm_dev_state_free(struct xfrm_state *x)
1919{
1920}
1921
1922static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1923{
1924 return false;
1925}
1926
1927static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1928{
1929}
1930
1931static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1932{
1933 return false;
1934}
1935#endif
1936
1937static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1938{
1939 if (attrs[XFRMA_MARK])
1940 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1941 else
1942 m->v = m->m = 0;
1943
1944 return m->v & m->m;
1945}
1946
1947static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1948{
1949 int ret = 0;
1950
1951 if (m->m | m->v)
1952 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1953 return ret;
1954}
1955
1956static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1957{
1958 struct xfrm_mark *m = &x->props.smark;
1959
1960 return (m->v & m->m) | (mark & ~m->m);
1961}
1962
1963static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1964{
1965 int ret = 0;
1966
1967 if (if_id)
1968 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1969 return ret;
1970}
1971
1972static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1973 unsigned int family)
1974{
1975 bool tunnel = false;
1976
1977 switch(family) {
1978 case AF_INET:
1979 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1980 tunnel = true;
1981 break;
1982 case AF_INET6:
1983 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1984 tunnel = true;
1985 break;
1986 }
1987 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1988 return -EINVAL;
1989
1990 return 0;
1991}
1992
1993extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
1994extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1995
1996struct xfrm_translator {
1997 /* Allocate frag_list and put compat translation there */
1998 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
1999
2000 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2001 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2002 int maxtype, const struct nla_policy *policy,
2003 struct netlink_ext_ack *extack);
2004
2005 /* Translate 32-bit user_policy from sockptr */
2006 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2007
2008 struct module *owner;
2009};
2010
2011#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2012extern int xfrm_register_translator(struct xfrm_translator *xtr);
2013extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2014extern struct xfrm_translator *xfrm_get_translator(void);
2015extern void xfrm_put_translator(struct xfrm_translator *xtr);
2016#else
2017static inline struct xfrm_translator *xfrm_get_translator(void)
2018{
2019 return NULL;
2020}
2021static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2022{
2023}
2024#endif
2025
2026#if IS_ENABLED(CONFIG_IPV6)
2027static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2028{
2029 int proto;
2030
2031 if (!sk || sk->sk_family != AF_INET6)
2032 return false;
2033
2034 proto = sk->sk_protocol;
2035 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2036 return inet6_sk(sk)->dontfrag;
2037
2038 return false;
2039}
2040#endif
2041#endif /* _NET_XFRM_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_XFRM_H
3#define _NET_XFRM_H
4
5#include <linux/compiler.h>
6#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/pfkeyv2.h>
12#include <linux/ipsec.h>
13#include <linux/in6.h>
14#include <linux/mutex.h>
15#include <linux/audit.h>
16#include <linux/slab.h>
17#include <linux/refcount.h>
18
19#include <net/sock.h>
20#include <net/dst.h>
21#include <net/ip.h>
22#include <net/route.h>
23#include <net/ipv6.h>
24#include <net/ip6_fib.h>
25#include <net/flow.h>
26
27#include <linux/interrupt.h>
28
29#ifdef CONFIG_XFRM_STATISTICS
30#include <net/snmp.h>
31#endif
32
33#define XFRM_PROTO_ESP 50
34#define XFRM_PROTO_AH 51
35#define XFRM_PROTO_COMP 108
36#define XFRM_PROTO_IPIP 4
37#define XFRM_PROTO_IPV6 41
38#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
39#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
40
41#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
42#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
43#define MODULE_ALIAS_XFRM_MODE(family, encap) \
44 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
45#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
46 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
47#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
49
50#ifdef CONFIG_XFRM_STATISTICS
51#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
52#else
53#define XFRM_INC_STATS(net, field) ((void)(net))
54#endif
55
56
57/* Organization of SPD aka "XFRM rules"
58 ------------------------------------
59
60 Basic objects:
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
65
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
70
71 Lookup is plain linear search until the first match with selector.
72
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
79
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
83 |---. child .-> NULL
84
85 Bundles are cached at xrfm_policy struct (field ->bundles).
86
87
88 Resolution of xrfm_tmpl
89 -----------------------
90 Template contains:
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
101 flow id?
102
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
106
107 PROBLEMS:
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116 */
117
118struct xfrm_state_walk {
119 struct list_head all;
120 u8 state;
121 u8 dying;
122 u8 proto;
123 u32 seq;
124 struct xfrm_address_filter *filter;
125};
126
127struct xfrm_state_offload {
128 struct net_device *dev;
129 unsigned long offload_handle;
130 unsigned int num_exthdrs;
131 u8 flags;
132};
133
134/* Full description of state of transformer. */
135struct xfrm_state {
136 possible_net_t xs_net;
137 union {
138 struct hlist_node gclist;
139 struct hlist_node bydst;
140 };
141 struct hlist_node bysrc;
142 struct hlist_node byspi;
143
144 refcount_t refcnt;
145 spinlock_t lock;
146
147 struct xfrm_id id;
148 struct xfrm_selector sel;
149 struct xfrm_mark mark;
150 u32 tfcpad;
151
152 u32 genid;
153
154 /* Key manager bits */
155 struct xfrm_state_walk km;
156
157 /* Parameters of this state. */
158 struct {
159 u32 reqid;
160 u8 mode;
161 u8 replay_window;
162 u8 aalgo, ealgo, calgo;
163 u8 flags;
164 u16 family;
165 xfrm_address_t saddr;
166 int header_len;
167 int trailer_len;
168 u32 extra_flags;
169 u32 output_mark;
170 } props;
171
172 struct xfrm_lifetime_cfg lft;
173
174 /* Data for transformer */
175 struct xfrm_algo_auth *aalg;
176 struct xfrm_algo *ealg;
177 struct xfrm_algo *calg;
178 struct xfrm_algo_aead *aead;
179 const char *geniv;
180
181 /* Data for encapsulator */
182 struct xfrm_encap_tmpl *encap;
183
184 /* Data for care-of address */
185 xfrm_address_t *coaddr;
186
187 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
188 struct xfrm_state *tunnel;
189
190 /* If a tunnel, number of users + 1 */
191 atomic_t tunnel_users;
192
193 /* State for replay detection */
194 struct xfrm_replay_state replay;
195 struct xfrm_replay_state_esn *replay_esn;
196
197 /* Replay detection state at the time we sent the last notification */
198 struct xfrm_replay_state preplay;
199 struct xfrm_replay_state_esn *preplay_esn;
200
201 /* The functions for replay detection. */
202 const struct xfrm_replay *repl;
203
204 /* internal flag that only holds state for delayed aevent at the
205 * moment
206 */
207 u32 xflags;
208
209 /* Replay detection notification settings */
210 u32 replay_maxage;
211 u32 replay_maxdiff;
212
213 /* Replay detection notification timer */
214 struct timer_list rtimer;
215
216 /* Statistics */
217 struct xfrm_stats stats;
218
219 struct xfrm_lifetime_cur curlft;
220 struct tasklet_hrtimer mtimer;
221
222 struct xfrm_state_offload xso;
223
224 /* used to fix curlft->add_time when changing date */
225 long saved_tmo;
226
227 /* Last used time */
228 unsigned long lastused;
229
230 struct page_frag xfrag;
231
232 /* Reference to data common to all the instances of this
233 * transformer. */
234 const struct xfrm_type *type;
235 struct xfrm_mode *inner_mode;
236 struct xfrm_mode *inner_mode_iaf;
237 struct xfrm_mode *outer_mode;
238
239 const struct xfrm_type_offload *type_offload;
240
241 /* Security context */
242 struct xfrm_sec_ctx *security;
243
244 /* Private data of this transformer, format is opaque,
245 * interpreted by xfrm_type methods. */
246 void *data;
247};
248
249static inline struct net *xs_net(struct xfrm_state *x)
250{
251 return read_pnet(&x->xs_net);
252}
253
254/* xflags - make enum if more show up */
255#define XFRM_TIME_DEFER 1
256#define XFRM_SOFT_EXPIRE 2
257
258enum {
259 XFRM_STATE_VOID,
260 XFRM_STATE_ACQ,
261 XFRM_STATE_VALID,
262 XFRM_STATE_ERROR,
263 XFRM_STATE_EXPIRED,
264 XFRM_STATE_DEAD
265};
266
267/* callback structure passed from either netlink or pfkey */
268struct km_event {
269 union {
270 u32 hard;
271 u32 proto;
272 u32 byid;
273 u32 aevent;
274 u32 type;
275 } data;
276
277 u32 seq;
278 u32 portid;
279 u32 event;
280 struct net *net;
281};
282
283struct xfrm_replay {
284 void (*advance)(struct xfrm_state *x, __be32 net_seq);
285 int (*check)(struct xfrm_state *x,
286 struct sk_buff *skb,
287 __be32 net_seq);
288 int (*recheck)(struct xfrm_state *x,
289 struct sk_buff *skb,
290 __be32 net_seq);
291 void (*notify)(struct xfrm_state *x, int event);
292 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
293};
294
295struct net_device;
296struct xfrm_type;
297struct xfrm_dst;
298struct xfrm_policy_afinfo {
299 struct dst_ops *dst_ops;
300 struct dst_entry *(*dst_lookup)(struct net *net,
301 int tos, int oif,
302 const xfrm_address_t *saddr,
303 const xfrm_address_t *daddr,
304 u32 mark);
305 int (*get_saddr)(struct net *net, int oif,
306 xfrm_address_t *saddr,
307 xfrm_address_t *daddr,
308 u32 mark);
309 void (*decode_session)(struct sk_buff *skb,
310 struct flowi *fl,
311 int reverse);
312 int (*get_tos)(const struct flowi *fl);
313 int (*init_path)(struct xfrm_dst *path,
314 struct dst_entry *dst,
315 int nfheader_len);
316 int (*fill_dst)(struct xfrm_dst *xdst,
317 struct net_device *dev,
318 const struct flowi *fl);
319 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
320};
321
322int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
323void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
324void km_policy_notify(struct xfrm_policy *xp, int dir,
325 const struct km_event *c);
326void xfrm_policy_cache_flush(void);
327void km_state_notify(struct xfrm_state *x, const struct km_event *c);
328
329struct xfrm_tmpl;
330int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
331 struct xfrm_policy *pol);
332void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
333int __xfrm_state_delete(struct xfrm_state *x);
334
335struct xfrm_state_afinfo {
336 unsigned int family;
337 unsigned int proto;
338 __be16 eth_proto;
339 struct module *owner;
340 const struct xfrm_type *type_map[IPPROTO_MAX];
341 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX];
342 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
343
344 int (*init_flags)(struct xfrm_state *x);
345 void (*init_tempsel)(struct xfrm_selector *sel,
346 const struct flowi *fl);
347 void (*init_temprop)(struct xfrm_state *x,
348 const struct xfrm_tmpl *tmpl,
349 const xfrm_address_t *daddr,
350 const xfrm_address_t *saddr);
351 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
352 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
353 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
354 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
355 int (*extract_input)(struct xfrm_state *x,
356 struct sk_buff *skb);
357 int (*extract_output)(struct xfrm_state *x,
358 struct sk_buff *skb);
359 int (*transport_finish)(struct sk_buff *skb,
360 int async);
361 void (*local_error)(struct sk_buff *skb, u32 mtu);
362};
363
364int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
365int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
366struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
367struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
368
369struct xfrm_input_afinfo {
370 unsigned int family;
371 int (*callback)(struct sk_buff *skb, u8 protocol,
372 int err);
373};
374
375int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
376int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
377
378void xfrm_flush_gc(void);
379void xfrm_state_delete_tunnel(struct xfrm_state *x);
380
381struct xfrm_type {
382 char *description;
383 struct module *owner;
384 u8 proto;
385 u8 flags;
386#define XFRM_TYPE_NON_FRAGMENT 1
387#define XFRM_TYPE_REPLAY_PROT 2
388#define XFRM_TYPE_LOCAL_COADDR 4
389#define XFRM_TYPE_REMOTE_COADDR 8
390
391 int (*init_state)(struct xfrm_state *x);
392 void (*destructor)(struct xfrm_state *);
393 int (*input)(struct xfrm_state *, struct sk_buff *skb);
394 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
395 int (*reject)(struct xfrm_state *, struct sk_buff *,
396 const struct flowi *);
397 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
398 /* Estimate maximal size of result of transformation of a dgram */
399 u32 (*get_mtu)(struct xfrm_state *, int size);
400};
401
402int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
403int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
404
405struct xfrm_type_offload {
406 char *description;
407 struct module *owner;
408 u8 proto;
409 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
410 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
411 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
412};
413
414int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
415int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
416
417struct xfrm_mode {
418 /*
419 * Remove encapsulation header.
420 *
421 * The IP header will be moved over the top of the encapsulation
422 * header.
423 *
424 * On entry, the transport header shall point to where the IP header
425 * should be and the network header shall be set to where the IP
426 * header currently is. skb->data shall point to the start of the
427 * payload.
428 */
429 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
430
431 /*
432 * This is the actual input entry point.
433 *
434 * For transport mode and equivalent this would be identical to
435 * input2 (which does not need to be set). While tunnel mode
436 * and equivalent would set this to the tunnel encapsulation function
437 * xfrm4_prepare_input that would in turn call input2.
438 */
439 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
440
441 /*
442 * Add encapsulation header.
443 *
444 * On exit, the transport header will be set to the start of the
445 * encapsulation header to be filled in by x->type->output and
446 * the mac header will be set to the nextheader (protocol for
447 * IPv4) field of the extension header directly preceding the
448 * encapsulation header, or in its absence, that of the top IP
449 * header. The value of the network header will always point
450 * to the top IP header while skb->data will point to the payload.
451 */
452 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
453
454 /*
455 * This is the actual output entry point.
456 *
457 * For transport mode and equivalent this would be identical to
458 * output2 (which does not need to be set). While tunnel mode
459 * and equivalent would set this to a tunnel encapsulation function
460 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
461 * call output2.
462 */
463 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
464
465 /*
466 * Adjust pointers into the packet and do GSO segmentation.
467 */
468 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
469
470 /*
471 * Adjust pointers into the packet when IPsec is done at layer2.
472 */
473 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
474
475 struct xfrm_state_afinfo *afinfo;
476 struct module *owner;
477 unsigned int encap;
478 int flags;
479};
480
481/* Flags for xfrm_mode. */
482enum {
483 XFRM_MODE_FLAG_TUNNEL = 1,
484};
485
486int xfrm_register_mode(struct xfrm_mode *mode, int family);
487int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
488
489static inline int xfrm_af2proto(unsigned int family)
490{
491 switch(family) {
492 case AF_INET:
493 return IPPROTO_IPIP;
494 case AF_INET6:
495 return IPPROTO_IPV6;
496 default:
497 return 0;
498 }
499}
500
501static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
502{
503 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
504 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
505 return x->inner_mode;
506 else
507 return x->inner_mode_iaf;
508}
509
510struct xfrm_tmpl {
511/* id in template is interpreted as:
512 * daddr - destination of tunnel, may be zero for transport mode.
513 * spi - zero to acquire spi. Not zero if spi is static, then
514 * daddr must be fixed too.
515 * proto - AH/ESP/IPCOMP
516 */
517 struct xfrm_id id;
518
519/* Source address of tunnel. Ignored, if it is not a tunnel. */
520 xfrm_address_t saddr;
521
522 unsigned short encap_family;
523
524 u32 reqid;
525
526/* Mode: transport, tunnel etc. */
527 u8 mode;
528
529/* Sharing mode: unique, this session only, this user only etc. */
530 u8 share;
531
532/* May skip this transfomration if no SA is found */
533 u8 optional;
534
535/* Skip aalgos/ealgos/calgos checks. */
536 u8 allalgs;
537
538/* Bit mask of algos allowed for acquisition */
539 u32 aalgos;
540 u32 ealgos;
541 u32 calgos;
542};
543
544#define XFRM_MAX_DEPTH 6
545#define XFRM_MAX_OFFLOAD_DEPTH 1
546
547struct xfrm_policy_walk_entry {
548 struct list_head all;
549 u8 dead;
550};
551
552struct xfrm_policy_walk {
553 struct xfrm_policy_walk_entry walk;
554 u8 type;
555 u32 seq;
556};
557
558struct xfrm_policy_queue {
559 struct sk_buff_head hold_queue;
560 struct timer_list hold_timer;
561 unsigned long timeout;
562};
563
564struct xfrm_policy {
565 possible_net_t xp_net;
566 struct hlist_node bydst;
567 struct hlist_node byidx;
568
569 /* This lock only affects elements except for entry. */
570 rwlock_t lock;
571 refcount_t refcnt;
572 struct timer_list timer;
573
574 atomic_t genid;
575 u32 priority;
576 u32 index;
577 struct xfrm_mark mark;
578 struct xfrm_selector selector;
579 struct xfrm_lifetime_cfg lft;
580 struct xfrm_lifetime_cur curlft;
581 struct xfrm_policy_walk_entry walk;
582 struct xfrm_policy_queue polq;
583 u8 type;
584 u8 action;
585 u8 flags;
586 u8 xfrm_nr;
587 u16 family;
588 struct xfrm_sec_ctx *security;
589 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
590 struct rcu_head rcu;
591};
592
593static inline struct net *xp_net(const struct xfrm_policy *xp)
594{
595 return read_pnet(&xp->xp_net);
596}
597
598struct xfrm_kmaddress {
599 xfrm_address_t local;
600 xfrm_address_t remote;
601 u32 reserved;
602 u16 family;
603};
604
605struct xfrm_migrate {
606 xfrm_address_t old_daddr;
607 xfrm_address_t old_saddr;
608 xfrm_address_t new_daddr;
609 xfrm_address_t new_saddr;
610 u8 proto;
611 u8 mode;
612 u16 reserved;
613 u32 reqid;
614 u16 old_family;
615 u16 new_family;
616};
617
618#define XFRM_KM_TIMEOUT 30
619/* what happened */
620#define XFRM_REPLAY_UPDATE XFRM_AE_CR
621#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
622
623/* default aevent timeout in units of 100ms */
624#define XFRM_AE_ETIME 10
625/* Async Event timer multiplier */
626#define XFRM_AE_ETH_M 10
627/* default seq threshold size */
628#define XFRM_AE_SEQT_SIZE 2
629
630struct xfrm_mgr {
631 struct list_head list;
632 int (*notify)(struct xfrm_state *x, const struct km_event *c);
633 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
634 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
635 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
636 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
637 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
638 int (*migrate)(const struct xfrm_selector *sel,
639 u8 dir, u8 type,
640 const struct xfrm_migrate *m,
641 int num_bundles,
642 const struct xfrm_kmaddress *k,
643 const struct xfrm_encap_tmpl *encap);
644 bool (*is_alive)(const struct km_event *c);
645};
646
647int xfrm_register_km(struct xfrm_mgr *km);
648int xfrm_unregister_km(struct xfrm_mgr *km);
649
650struct xfrm_tunnel_skb_cb {
651 union {
652 struct inet_skb_parm h4;
653 struct inet6_skb_parm h6;
654 } header;
655
656 union {
657 struct ip_tunnel *ip4;
658 struct ip6_tnl *ip6;
659 } tunnel;
660};
661
662#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
663
664/*
665 * This structure is used for the duration where packets are being
666 * transformed by IPsec. As soon as the packet leaves IPsec the
667 * area beyond the generic IP part may be overwritten.
668 */
669struct xfrm_skb_cb {
670 struct xfrm_tunnel_skb_cb header;
671
672 /* Sequence number for replay protection. */
673 union {
674 struct {
675 __u32 low;
676 __u32 hi;
677 } output;
678 struct {
679 __be32 low;
680 __be32 hi;
681 } input;
682 } seq;
683};
684
685#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
686
687/*
688 * This structure is used by the afinfo prepare_input/prepare_output functions
689 * to transmit header information to the mode input/output functions.
690 */
691struct xfrm_mode_skb_cb {
692 struct xfrm_tunnel_skb_cb header;
693
694 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
695 __be16 id;
696 __be16 frag_off;
697
698 /* IP header length (excluding options or extension headers). */
699 u8 ihl;
700
701 /* TOS for IPv4, class for IPv6. */
702 u8 tos;
703
704 /* TTL for IPv4, hop limitfor IPv6. */
705 u8 ttl;
706
707 /* Protocol for IPv4, NH for IPv6. */
708 u8 protocol;
709
710 /* Option length for IPv4, zero for IPv6. */
711 u8 optlen;
712
713 /* Used by IPv6 only, zero for IPv4. */
714 u8 flow_lbl[3];
715};
716
717#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
718
719/*
720 * This structure is used by the input processing to locate the SPI and
721 * related information.
722 */
723struct xfrm_spi_skb_cb {
724 struct xfrm_tunnel_skb_cb header;
725
726 unsigned int daddroff;
727 unsigned int family;
728 __be32 seq;
729};
730
731#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
732
733#ifdef CONFIG_AUDITSYSCALL
734static inline struct audit_buffer *xfrm_audit_start(const char *op)
735{
736 struct audit_buffer *audit_buf = NULL;
737
738 if (audit_enabled == 0)
739 return NULL;
740 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
741 AUDIT_MAC_IPSEC_EVENT);
742 if (audit_buf == NULL)
743 return NULL;
744 audit_log_format(audit_buf, "op=%s", op);
745 return audit_buf;
746}
747
748static inline void xfrm_audit_helper_usrinfo(bool task_valid,
749 struct audit_buffer *audit_buf)
750{
751 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
752 audit_get_loginuid(current) :
753 INVALID_UID);
754 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
755 (unsigned int) -1;
756
757 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
758 audit_log_task_context(audit_buf);
759}
760
761void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
762void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
763 bool task_valid);
764void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
765void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
766void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
767 struct sk_buff *skb);
768void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
769 __be32 net_seq);
770void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
771void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
772 __be32 net_seq);
773void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
774 u8 proto);
775#else
776
777static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
778 bool task_valid)
779{
780}
781
782static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
783 bool task_valid)
784{
785}
786
787static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
788 bool task_valid)
789{
790}
791
792static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
793 bool task_valid)
794{
795}
796
797static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
798 struct sk_buff *skb)
799{
800}
801
802static inline void xfrm_audit_state_replay(struct xfrm_state *x,
803 struct sk_buff *skb, __be32 net_seq)
804{
805}
806
807static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
808 u16 family)
809{
810}
811
812static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
813 __be32 net_spi, __be32 net_seq)
814{
815}
816
817static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
818 struct sk_buff *skb, u8 proto)
819{
820}
821#endif /* CONFIG_AUDITSYSCALL */
822
823static inline void xfrm_pol_hold(struct xfrm_policy *policy)
824{
825 if (likely(policy != NULL))
826 refcount_inc(&policy->refcnt);
827}
828
829void xfrm_policy_destroy(struct xfrm_policy *policy);
830
831static inline void xfrm_pol_put(struct xfrm_policy *policy)
832{
833 if (refcount_dec_and_test(&policy->refcnt))
834 xfrm_policy_destroy(policy);
835}
836
837static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
838{
839 int i;
840 for (i = npols - 1; i >= 0; --i)
841 xfrm_pol_put(pols[i]);
842}
843
844void __xfrm_state_destroy(struct xfrm_state *);
845
846static inline void __xfrm_state_put(struct xfrm_state *x)
847{
848 refcount_dec(&x->refcnt);
849}
850
851static inline void xfrm_state_put(struct xfrm_state *x)
852{
853 if (refcount_dec_and_test(&x->refcnt))
854 __xfrm_state_destroy(x);
855}
856
857static inline void xfrm_state_hold(struct xfrm_state *x)
858{
859 refcount_inc(&x->refcnt);
860}
861
862static inline bool addr_match(const void *token1, const void *token2,
863 unsigned int prefixlen)
864{
865 const __be32 *a1 = token1;
866 const __be32 *a2 = token2;
867 unsigned int pdw;
868 unsigned int pbi;
869
870 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
871 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
872
873 if (pdw)
874 if (memcmp(a1, a2, pdw << 2))
875 return false;
876
877 if (pbi) {
878 __be32 mask;
879
880 mask = htonl((0xffffffff) << (32 - pbi));
881
882 if ((a1[pdw] ^ a2[pdw]) & mask)
883 return false;
884 }
885
886 return true;
887}
888
889static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
890{
891 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
892 if (sizeof(long) == 4 && prefixlen == 0)
893 return true;
894 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
895}
896
897static __inline__
898__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
899{
900 __be16 port;
901 switch(fl->flowi_proto) {
902 case IPPROTO_TCP:
903 case IPPROTO_UDP:
904 case IPPROTO_UDPLITE:
905 case IPPROTO_SCTP:
906 port = uli->ports.sport;
907 break;
908 case IPPROTO_ICMP:
909 case IPPROTO_ICMPV6:
910 port = htons(uli->icmpt.type);
911 break;
912 case IPPROTO_MH:
913 port = htons(uli->mht.type);
914 break;
915 case IPPROTO_GRE:
916 port = htons(ntohl(uli->gre_key) >> 16);
917 break;
918 default:
919 port = 0; /*XXX*/
920 }
921 return port;
922}
923
924static __inline__
925__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
926{
927 __be16 port;
928 switch(fl->flowi_proto) {
929 case IPPROTO_TCP:
930 case IPPROTO_UDP:
931 case IPPROTO_UDPLITE:
932 case IPPROTO_SCTP:
933 port = uli->ports.dport;
934 break;
935 case IPPROTO_ICMP:
936 case IPPROTO_ICMPV6:
937 port = htons(uli->icmpt.code);
938 break;
939 case IPPROTO_GRE:
940 port = htons(ntohl(uli->gre_key) & 0xffff);
941 break;
942 default:
943 port = 0; /*XXX*/
944 }
945 return port;
946}
947
948bool xfrm_selector_match(const struct xfrm_selector *sel,
949 const struct flowi *fl, unsigned short family);
950
951#ifdef CONFIG_SECURITY_NETWORK_XFRM
952/* If neither has a context --> match
953 * Otherwise, both must have a context and the sids, doi, alg must match
954 */
955static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
956{
957 return ((!s1 && !s2) ||
958 (s1 && s2 &&
959 (s1->ctx_sid == s2->ctx_sid) &&
960 (s1->ctx_doi == s2->ctx_doi) &&
961 (s1->ctx_alg == s2->ctx_alg)));
962}
963#else
964static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
965{
966 return true;
967}
968#endif
969
970/* A struct encoding bundle of transformations to apply to some set of flow.
971 *
972 * xdst->child points to the next element of bundle.
973 * dst->xfrm points to an instanse of transformer.
974 *
975 * Due to unfortunate limitations of current routing cache, which we
976 * have no time to fix, it mirrors struct rtable and bound to the same
977 * routing key, including saddr,daddr. However, we can have many of
978 * bundles differing by session id. All the bundles grow from a parent
979 * policy rule.
980 */
981struct xfrm_dst {
982 union {
983 struct dst_entry dst;
984 struct rtable rt;
985 struct rt6_info rt6;
986 } u;
987 struct dst_entry *route;
988 struct dst_entry *child;
989 struct dst_entry *path;
990 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
991 int num_pols, num_xfrms;
992 u32 xfrm_genid;
993 u32 policy_genid;
994 u32 route_mtu_cached;
995 u32 child_mtu_cached;
996 u32 route_cookie;
997 u32 path_cookie;
998};
999
1000static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1001{
1002#ifdef CONFIG_XFRM
1003 if (dst->xfrm) {
1004 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1005
1006 return xdst->path;
1007 }
1008#endif
1009 return (struct dst_entry *) dst;
1010}
1011
1012static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1013{
1014#ifdef CONFIG_XFRM
1015 if (dst->xfrm) {
1016 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1017 return xdst->child;
1018 }
1019#endif
1020 return NULL;
1021}
1022
1023#ifdef CONFIG_XFRM
1024static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1025{
1026 xdst->child = child;
1027}
1028
1029static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1030{
1031 xfrm_pols_put(xdst->pols, xdst->num_pols);
1032 dst_release(xdst->route);
1033 if (likely(xdst->u.dst.xfrm))
1034 xfrm_state_put(xdst->u.dst.xfrm);
1035}
1036#endif
1037
1038void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1039
1040struct xfrm_offload {
1041 /* Output sequence number for replay protection on offloading. */
1042 struct {
1043 __u32 low;
1044 __u32 hi;
1045 } seq;
1046
1047 __u32 flags;
1048#define SA_DELETE_REQ 1
1049#define CRYPTO_DONE 2
1050#define CRYPTO_NEXT_DONE 4
1051#define CRYPTO_FALLBACK 8
1052#define XFRM_GSO_SEGMENT 16
1053#define XFRM_GRO 32
1054#define XFRM_ESP_NO_TRAILER 64
1055#define XFRM_DEV_RESUME 128
1056
1057 __u32 status;
1058#define CRYPTO_SUCCESS 1
1059#define CRYPTO_GENERIC_ERROR 2
1060#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1061#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1062#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1063#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1064#define CRYPTO_INVALID_PACKET_SYNTAX 64
1065#define CRYPTO_INVALID_PROTOCOL 128
1066
1067 __u8 proto;
1068};
1069
1070struct sec_path {
1071 refcount_t refcnt;
1072 int len;
1073 int olen;
1074
1075 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1076 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1077};
1078
1079static inline int secpath_exists(struct sk_buff *skb)
1080{
1081#ifdef CONFIG_XFRM
1082 return skb->sp != NULL;
1083#else
1084 return 0;
1085#endif
1086}
1087
1088static inline struct sec_path *
1089secpath_get(struct sec_path *sp)
1090{
1091 if (sp)
1092 refcount_inc(&sp->refcnt);
1093 return sp;
1094}
1095
1096void __secpath_destroy(struct sec_path *sp);
1097
1098static inline void
1099secpath_put(struct sec_path *sp)
1100{
1101 if (sp && refcount_dec_and_test(&sp->refcnt))
1102 __secpath_destroy(sp);
1103}
1104
1105struct sec_path *secpath_dup(struct sec_path *src);
1106int secpath_set(struct sk_buff *skb);
1107
1108static inline void
1109secpath_reset(struct sk_buff *skb)
1110{
1111#ifdef CONFIG_XFRM
1112 secpath_put(skb->sp);
1113 skb->sp = NULL;
1114#endif
1115}
1116
1117static inline int
1118xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1119{
1120 switch (family) {
1121 case AF_INET:
1122 return addr->a4 == 0;
1123 case AF_INET6:
1124 return ipv6_addr_any(&addr->in6);
1125 }
1126 return 0;
1127}
1128
1129static inline int
1130__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1131{
1132 return (tmpl->saddr.a4 &&
1133 tmpl->saddr.a4 != x->props.saddr.a4);
1134}
1135
1136static inline int
1137__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1138{
1139 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1140 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1141}
1142
1143static inline int
1144xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1145{
1146 switch (family) {
1147 case AF_INET:
1148 return __xfrm4_state_addr_cmp(tmpl, x);
1149 case AF_INET6:
1150 return __xfrm6_state_addr_cmp(tmpl, x);
1151 }
1152 return !0;
1153}
1154
1155#ifdef CONFIG_XFRM
1156int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1157 unsigned short family);
1158
1159static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1160 struct sk_buff *skb,
1161 unsigned int family, int reverse)
1162{
1163 struct net *net = dev_net(skb->dev);
1164 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1165
1166 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1167 return __xfrm_policy_check(sk, ndir, skb, family);
1168
1169 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1170 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1171 __xfrm_policy_check(sk, ndir, skb, family);
1172}
1173
1174static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1175{
1176 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1177}
1178
1179static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1180{
1181 return xfrm_policy_check(sk, dir, skb, AF_INET);
1182}
1183
1184static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1185{
1186 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1187}
1188
1189static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1190 struct sk_buff *skb)
1191{
1192 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1193}
1194
1195static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1196 struct sk_buff *skb)
1197{
1198 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1199}
1200
1201int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1202 unsigned int family, int reverse);
1203
1204static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1205 unsigned int family)
1206{
1207 return __xfrm_decode_session(skb, fl, family, 0);
1208}
1209
1210static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1211 struct flowi *fl,
1212 unsigned int family)
1213{
1214 return __xfrm_decode_session(skb, fl, family, 1);
1215}
1216
1217int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1218
1219static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1220{
1221 struct net *net = dev_net(skb->dev);
1222
1223 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1224 (skb_dst(skb)->flags & DST_NOXFRM) ||
1225 __xfrm_route_forward(skb, family);
1226}
1227
1228static inline int xfrm4_route_forward(struct sk_buff *skb)
1229{
1230 return xfrm_route_forward(skb, AF_INET);
1231}
1232
1233static inline int xfrm6_route_forward(struct sk_buff *skb)
1234{
1235 return xfrm_route_forward(skb, AF_INET6);
1236}
1237
1238int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1239
1240static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1241{
1242 sk->sk_policy[0] = NULL;
1243 sk->sk_policy[1] = NULL;
1244 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1245 return __xfrm_sk_clone_policy(sk, osk);
1246 return 0;
1247}
1248
1249int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1250
1251static inline void xfrm_sk_free_policy(struct sock *sk)
1252{
1253 struct xfrm_policy *pol;
1254
1255 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1256 if (unlikely(pol != NULL)) {
1257 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1258 sk->sk_policy[0] = NULL;
1259 }
1260 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1261 if (unlikely(pol != NULL)) {
1262 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1263 sk->sk_policy[1] = NULL;
1264 }
1265}
1266
1267#else
1268
1269static inline void xfrm_sk_free_policy(struct sock *sk) {}
1270static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1271static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1272static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1273static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1274{
1275 return 1;
1276}
1277static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1278{
1279 return 1;
1280}
1281static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1282{
1283 return 1;
1284}
1285static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1286 struct flowi *fl,
1287 unsigned int family)
1288{
1289 return -ENOSYS;
1290}
1291static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1292 struct sk_buff *skb)
1293{
1294 return 1;
1295}
1296static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1297 struct sk_buff *skb)
1298{
1299 return 1;
1300}
1301#endif
1302
1303static __inline__
1304xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1305{
1306 switch (family){
1307 case AF_INET:
1308 return (xfrm_address_t *)&fl->u.ip4.daddr;
1309 case AF_INET6:
1310 return (xfrm_address_t *)&fl->u.ip6.daddr;
1311 }
1312 return NULL;
1313}
1314
1315static __inline__
1316xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1317{
1318 switch (family){
1319 case AF_INET:
1320 return (xfrm_address_t *)&fl->u.ip4.saddr;
1321 case AF_INET6:
1322 return (xfrm_address_t *)&fl->u.ip6.saddr;
1323 }
1324 return NULL;
1325}
1326
1327static __inline__
1328void xfrm_flowi_addr_get(const struct flowi *fl,
1329 xfrm_address_t *saddr, xfrm_address_t *daddr,
1330 unsigned short family)
1331{
1332 switch(family) {
1333 case AF_INET:
1334 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1335 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1336 break;
1337 case AF_INET6:
1338 saddr->in6 = fl->u.ip6.saddr;
1339 daddr->in6 = fl->u.ip6.daddr;
1340 break;
1341 }
1342}
1343
1344static __inline__ int
1345__xfrm4_state_addr_check(const struct xfrm_state *x,
1346 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1347{
1348 if (daddr->a4 == x->id.daddr.a4 &&
1349 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1350 return 1;
1351 return 0;
1352}
1353
1354static __inline__ int
1355__xfrm6_state_addr_check(const struct xfrm_state *x,
1356 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1357{
1358 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1359 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1360 ipv6_addr_any((struct in6_addr *)saddr) ||
1361 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1362 return 1;
1363 return 0;
1364}
1365
1366static __inline__ int
1367xfrm_state_addr_check(const struct xfrm_state *x,
1368 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1369 unsigned short family)
1370{
1371 switch (family) {
1372 case AF_INET:
1373 return __xfrm4_state_addr_check(x, daddr, saddr);
1374 case AF_INET6:
1375 return __xfrm6_state_addr_check(x, daddr, saddr);
1376 }
1377 return 0;
1378}
1379
1380static __inline__ int
1381xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1382 unsigned short family)
1383{
1384 switch (family) {
1385 case AF_INET:
1386 return __xfrm4_state_addr_check(x,
1387 (const xfrm_address_t *)&fl->u.ip4.daddr,
1388 (const xfrm_address_t *)&fl->u.ip4.saddr);
1389 case AF_INET6:
1390 return __xfrm6_state_addr_check(x,
1391 (const xfrm_address_t *)&fl->u.ip6.daddr,
1392 (const xfrm_address_t *)&fl->u.ip6.saddr);
1393 }
1394 return 0;
1395}
1396
1397static inline int xfrm_state_kern(const struct xfrm_state *x)
1398{
1399 return atomic_read(&x->tunnel_users);
1400}
1401
1402static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1403{
1404 return (!userproto || proto == userproto ||
1405 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1406 proto == IPPROTO_ESP ||
1407 proto == IPPROTO_COMP)));
1408}
1409
1410/*
1411 * xfrm algorithm information
1412 */
1413struct xfrm_algo_aead_info {
1414 char *geniv;
1415 u16 icv_truncbits;
1416};
1417
1418struct xfrm_algo_auth_info {
1419 u16 icv_truncbits;
1420 u16 icv_fullbits;
1421};
1422
1423struct xfrm_algo_encr_info {
1424 char *geniv;
1425 u16 blockbits;
1426 u16 defkeybits;
1427};
1428
1429struct xfrm_algo_comp_info {
1430 u16 threshold;
1431};
1432
1433struct xfrm_algo_desc {
1434 char *name;
1435 char *compat;
1436 u8 available:1;
1437 u8 pfkey_supported:1;
1438 union {
1439 struct xfrm_algo_aead_info aead;
1440 struct xfrm_algo_auth_info auth;
1441 struct xfrm_algo_encr_info encr;
1442 struct xfrm_algo_comp_info comp;
1443 } uinfo;
1444 struct sadb_alg desc;
1445};
1446
1447/* XFRM protocol handlers. */
1448struct xfrm4_protocol {
1449 int (*handler)(struct sk_buff *skb);
1450 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1451 int encap_type);
1452 int (*cb_handler)(struct sk_buff *skb, int err);
1453 int (*err_handler)(struct sk_buff *skb, u32 info);
1454
1455 struct xfrm4_protocol __rcu *next;
1456 int priority;
1457};
1458
1459struct xfrm6_protocol {
1460 int (*handler)(struct sk_buff *skb);
1461 int (*cb_handler)(struct sk_buff *skb, int err);
1462 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1463 u8 type, u8 code, int offset, __be32 info);
1464
1465 struct xfrm6_protocol __rcu *next;
1466 int priority;
1467};
1468
1469/* XFRM tunnel handlers. */
1470struct xfrm_tunnel {
1471 int (*handler)(struct sk_buff *skb);
1472 int (*err_handler)(struct sk_buff *skb, u32 info);
1473
1474 struct xfrm_tunnel __rcu *next;
1475 int priority;
1476};
1477
1478struct xfrm6_tunnel {
1479 int (*handler)(struct sk_buff *skb);
1480 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1481 u8 type, u8 code, int offset, __be32 info);
1482 struct xfrm6_tunnel __rcu *next;
1483 int priority;
1484};
1485
1486void xfrm_init(void);
1487void xfrm4_init(void);
1488int xfrm_state_init(struct net *net);
1489void xfrm_state_fini(struct net *net);
1490void xfrm4_state_init(void);
1491void xfrm4_protocol_init(void);
1492#ifdef CONFIG_XFRM
1493int xfrm6_init(void);
1494void xfrm6_fini(void);
1495int xfrm6_state_init(void);
1496void xfrm6_state_fini(void);
1497int xfrm6_protocol_init(void);
1498void xfrm6_protocol_fini(void);
1499#else
1500static inline int xfrm6_init(void)
1501{
1502 return 0;
1503}
1504static inline void xfrm6_fini(void)
1505{
1506 ;
1507}
1508#endif
1509
1510#ifdef CONFIG_XFRM_STATISTICS
1511int xfrm_proc_init(struct net *net);
1512void xfrm_proc_fini(struct net *net);
1513#endif
1514
1515int xfrm_sysctl_init(struct net *net);
1516#ifdef CONFIG_SYSCTL
1517void xfrm_sysctl_fini(struct net *net);
1518#else
1519static inline void xfrm_sysctl_fini(struct net *net)
1520{
1521}
1522#endif
1523
1524void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1525 struct xfrm_address_filter *filter);
1526int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1527 int (*func)(struct xfrm_state *, int, void*), void *);
1528void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1529struct xfrm_state *xfrm_state_alloc(struct net *net);
1530struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1531 const xfrm_address_t *saddr,
1532 const struct flowi *fl,
1533 struct xfrm_tmpl *tmpl,
1534 struct xfrm_policy *pol, int *err,
1535 unsigned short family);
1536struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1537 xfrm_address_t *daddr,
1538 xfrm_address_t *saddr,
1539 unsigned short family,
1540 u8 mode, u8 proto, u32 reqid);
1541struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1542 unsigned short family);
1543int xfrm_state_check_expire(struct xfrm_state *x);
1544void xfrm_state_insert(struct xfrm_state *x);
1545int xfrm_state_add(struct xfrm_state *x);
1546int xfrm_state_update(struct xfrm_state *x);
1547struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1548 const xfrm_address_t *daddr, __be32 spi,
1549 u8 proto, unsigned short family);
1550struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1551 const xfrm_address_t *daddr,
1552 const xfrm_address_t *saddr,
1553 u8 proto,
1554 unsigned short family);
1555#ifdef CONFIG_XFRM_SUB_POLICY
1556int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1557 unsigned short family, struct net *net);
1558int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1559 unsigned short family);
1560#else
1561static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1562 int n, unsigned short family, struct net *net)
1563{
1564 return -ENOSYS;
1565}
1566
1567static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1568 int n, unsigned short family)
1569{
1570 return -ENOSYS;
1571}
1572#endif
1573
1574struct xfrmk_sadinfo {
1575 u32 sadhcnt; /* current hash bkts */
1576 u32 sadhmcnt; /* max allowed hash bkts */
1577 u32 sadcnt; /* current running count */
1578};
1579
1580struct xfrmk_spdinfo {
1581 u32 incnt;
1582 u32 outcnt;
1583 u32 fwdcnt;
1584 u32 inscnt;
1585 u32 outscnt;
1586 u32 fwdscnt;
1587 u32 spdhcnt;
1588 u32 spdhmcnt;
1589};
1590
1591struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1592int xfrm_state_delete(struct xfrm_state *x);
1593int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1594int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1595void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1596void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1597u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1598int xfrm_init_replay(struct xfrm_state *x);
1599int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1600int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1601int xfrm_init_state(struct xfrm_state *x);
1602int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1603int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1604int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1605int xfrm_trans_queue(struct sk_buff *skb,
1606 int (*finish)(struct net *, struct sock *,
1607 struct sk_buff *));
1608int xfrm_output_resume(struct sk_buff *skb, int err);
1609int xfrm_output(struct sock *sk, struct sk_buff *skb);
1610int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1611void xfrm_local_error(struct sk_buff *skb, int mtu);
1612int xfrm4_extract_header(struct sk_buff *skb);
1613int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1614int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1615 int encap_type);
1616int xfrm4_transport_finish(struct sk_buff *skb, int async);
1617int xfrm4_rcv(struct sk_buff *skb);
1618int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1619
1620static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1621{
1622 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1623 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1624 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1625 return xfrm_input(skb, nexthdr, spi, 0);
1626}
1627
1628int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1629int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1630int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1631int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1632int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1633int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1634int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1635int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1636int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1637void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1638int xfrm6_extract_header(struct sk_buff *skb);
1639int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1640int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1641 struct ip6_tnl *t);
1642int xfrm6_transport_finish(struct sk_buff *skb, int async);
1643int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1644int xfrm6_rcv(struct sk_buff *skb);
1645int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1646 xfrm_address_t *saddr, u8 proto);
1647void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1648int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1649int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1650int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1651int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1652int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1653__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1654__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1655int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1656int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1657int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1658int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1659int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1660 u8 **prevhdr);
1661
1662#ifdef CONFIG_XFRM
1663int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1664int xfrm_user_policy(struct sock *sk, int optname,
1665 u8 __user *optval, int optlen);
1666#else
1667static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1668{
1669 return -ENOPROTOOPT;
1670}
1671
1672static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1673{
1674 /* should not happen */
1675 kfree_skb(skb);
1676 return 0;
1677}
1678#endif
1679
1680struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1681 const xfrm_address_t *saddr,
1682 const xfrm_address_t *daddr,
1683 int family, u32 mark);
1684
1685struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1686
1687void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1688int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1689 int (*func)(struct xfrm_policy *, int, int, void*),
1690 void *);
1691void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1692int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1693struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1694 u8 type, int dir,
1695 struct xfrm_selector *sel,
1696 struct xfrm_sec_ctx *ctx, int delete,
1697 int *err);
1698struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1699 u32 id, int delete, int *err);
1700int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1701void xfrm_policy_hash_rebuild(struct net *net);
1702u32 xfrm_get_acqseq(void);
1703int verify_spi_info(u8 proto, u32 min, u32 max);
1704int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1705struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1706 u8 mode, u32 reqid, u8 proto,
1707 const xfrm_address_t *daddr,
1708 const xfrm_address_t *saddr, int create,
1709 unsigned short family);
1710int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1711
1712#ifdef CONFIG_XFRM_MIGRATE
1713int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1714 const struct xfrm_migrate *m, int num_bundles,
1715 const struct xfrm_kmaddress *k,
1716 const struct xfrm_encap_tmpl *encap);
1717struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1718struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1719 struct xfrm_migrate *m,
1720 struct xfrm_encap_tmpl *encap);
1721int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1722 struct xfrm_migrate *m, int num_bundles,
1723 struct xfrm_kmaddress *k, struct net *net,
1724 struct xfrm_encap_tmpl *encap);
1725#endif
1726
1727int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1728void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1729int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1730 xfrm_address_t *addr);
1731
1732void xfrm_input_init(void);
1733int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1734
1735void xfrm_probe_algs(void);
1736int xfrm_count_pfkey_auth_supported(void);
1737int xfrm_count_pfkey_enc_supported(void);
1738struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1739struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1740struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1741struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1742struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1743struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1744struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1745struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1746struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1747 int probe);
1748
1749static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1750 const xfrm_address_t *b)
1751{
1752 return ipv6_addr_equal((const struct in6_addr *)a,
1753 (const struct in6_addr *)b);
1754}
1755
1756static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1757 const xfrm_address_t *b,
1758 sa_family_t family)
1759{
1760 switch (family) {
1761 default:
1762 case AF_INET:
1763 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1764 case AF_INET6:
1765 return xfrm6_addr_equal(a, b);
1766 }
1767}
1768
1769static inline int xfrm_policy_id2dir(u32 index)
1770{
1771 return index & 7;
1772}
1773
1774#ifdef CONFIG_XFRM
1775static inline int xfrm_aevent_is_on(struct net *net)
1776{
1777 struct sock *nlsk;
1778 int ret = 0;
1779
1780 rcu_read_lock();
1781 nlsk = rcu_dereference(net->xfrm.nlsk);
1782 if (nlsk)
1783 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1784 rcu_read_unlock();
1785 return ret;
1786}
1787
1788static inline int xfrm_acquire_is_on(struct net *net)
1789{
1790 struct sock *nlsk;
1791 int ret = 0;
1792
1793 rcu_read_lock();
1794 nlsk = rcu_dereference(net->xfrm.nlsk);
1795 if (nlsk)
1796 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1797 rcu_read_unlock();
1798
1799 return ret;
1800}
1801#endif
1802
1803static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1804{
1805 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1806}
1807
1808static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1809{
1810 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1811}
1812
1813static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1814{
1815 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1816}
1817
1818static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1819{
1820 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1821}
1822
1823#ifdef CONFIG_XFRM_MIGRATE
1824static inline int xfrm_replay_clone(struct xfrm_state *x,
1825 struct xfrm_state *orig)
1826{
1827 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1828 GFP_KERNEL);
1829 if (!x->replay_esn)
1830 return -ENOMEM;
1831
1832 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1833 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1834
1835 x->preplay_esn = kmemdup(x->replay_esn,
1836 xfrm_replay_state_esn_len(x->replay_esn),
1837 GFP_KERNEL);
1838 if (!x->preplay_esn) {
1839 kfree(x->replay_esn);
1840 return -ENOMEM;
1841 }
1842
1843 return 0;
1844}
1845
1846static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1847{
1848 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1849}
1850
1851
1852static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1853{
1854 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1855}
1856
1857static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1858{
1859 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1860}
1861
1862static inline void xfrm_states_put(struct xfrm_state **states, int n)
1863{
1864 int i;
1865 for (i = 0; i < n; i++)
1866 xfrm_state_put(*(states + i));
1867}
1868
1869static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1870{
1871 int i;
1872 for (i = 0; i < n; i++)
1873 xfrm_state_delete(*(states + i));
1874}
1875#endif
1876
1877#ifdef CONFIG_XFRM
1878static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1879{
1880 return skb->sp->xvec[skb->sp->len - 1];
1881}
1882#endif
1883
1884static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1885{
1886#ifdef CONFIG_XFRM
1887 struct sec_path *sp = skb->sp;
1888
1889 if (!sp || !sp->olen || sp->len != sp->olen)
1890 return NULL;
1891
1892 return &sp->ovec[sp->olen - 1];
1893#else
1894 return NULL;
1895#endif
1896}
1897
1898void __init xfrm_dev_init(void);
1899
1900#ifdef CONFIG_XFRM_OFFLOAD
1901void xfrm_dev_resume(struct sk_buff *skb);
1902void xfrm_dev_backlog(struct softnet_data *sd);
1903struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1904int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1905 struct xfrm_user_offload *xuo);
1906bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1907
1908static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1909{
1910 struct xfrm_state_offload *xso = &x->xso;
1911
1912 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1913 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1914}
1915
1916static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1917{
1918 struct xfrm_state *x = dst->xfrm;
1919 struct xfrm_dst *xdst;
1920
1921 if (!x || !x->type_offload)
1922 return false;
1923
1924 xdst = (struct xfrm_dst *) dst;
1925 if (!x->xso.offload_handle && !xdst->child->xfrm)
1926 return true;
1927 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1928 !xdst->child->xfrm)
1929 return true;
1930
1931 return false;
1932}
1933
1934static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1935{
1936 struct xfrm_state_offload *xso = &x->xso;
1937
1938 if (xso->dev)
1939 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1940}
1941
1942static inline void xfrm_dev_state_free(struct xfrm_state *x)
1943{
1944 struct xfrm_state_offload *xso = &x->xso;
1945 struct net_device *dev = xso->dev;
1946
1947 if (dev && dev->xfrmdev_ops) {
1948 if (dev->xfrmdev_ops->xdo_dev_state_free)
1949 dev->xfrmdev_ops->xdo_dev_state_free(x);
1950 xso->dev = NULL;
1951 dev_put(dev);
1952 }
1953}
1954#else
1955static inline void xfrm_dev_resume(struct sk_buff *skb)
1956{
1957}
1958
1959static inline void xfrm_dev_backlog(struct softnet_data *sd)
1960{
1961}
1962
1963static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1964{
1965 return skb;
1966}
1967
1968static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1969{
1970 return 0;
1971}
1972
1973static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1974{
1975}
1976
1977static inline void xfrm_dev_state_free(struct xfrm_state *x)
1978{
1979}
1980
1981static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1982{
1983 return false;
1984}
1985
1986static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1987{
1988}
1989
1990static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1991{
1992 return false;
1993}
1994#endif
1995
1996static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1997{
1998 if (attrs[XFRMA_MARK])
1999 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2000 else
2001 m->v = m->m = 0;
2002
2003 return m->v & m->m;
2004}
2005
2006static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2007{
2008 int ret = 0;
2009
2010 if (m->m | m->v)
2011 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2012 return ret;
2013}
2014
2015static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2016 unsigned int family)
2017{
2018 bool tunnel = false;
2019
2020 switch(family) {
2021 case AF_INET:
2022 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2023 tunnel = true;
2024 break;
2025 case AF_INET6:
2026 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2027 tunnel = true;
2028 break;
2029 }
2030 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2031 return -EINVAL;
2032
2033 return 0;
2034}
2035#endif /* _NET_XFRM_H */