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