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1#ifndef _NET_XFRM_H
2#define _NET_XFRM_H
3
4#include <linux/compiler.h>
5#include <linux/xfrm.h>
6#include <linux/spinlock.h>
7#include <linux/list.h>
8#include <linux/skbuff.h>
9#include <linux/socket.h>
10#include <linux/pfkeyv2.h>
11#include <linux/ipsec.h>
12#include <linux/in6.h>
13#include <linux/mutex.h>
14#include <linux/audit.h>
15#include <linux/slab.h>
16
17#include <net/sock.h>
18#include <net/dst.h>
19#include <net/ip.h>
20#include <net/route.h>
21#include <net/ipv6.h>
22#include <net/ip6_fib.h>
23#include <net/flow.h>
24
25#include <linux/interrupt.h>
26
27#ifdef CONFIG_XFRM_STATISTICS
28#include <net/snmp.h>
29#endif
30
31#define XFRM_PROTO_ESP 50
32#define XFRM_PROTO_AH 51
33#define XFRM_PROTO_COMP 108
34#define XFRM_PROTO_IPIP 4
35#define XFRM_PROTO_IPV6 41
36#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41#define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46#ifdef CONFIG_XFRM_STATISTICS
47#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48#define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49#define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50#else
51#define XFRM_INC_STATS(net, field) ((void)(net))
52#define XFRM_INC_STATS_BH(net, field) ((void)(net))
53#define XFRM_INC_STATS_USER(net, field) ((void)(net))
54#endif
55
56
57/* Organization of SPD aka "XFRM rules"
58 ------------------------------------
59
60 Basic objects:
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
65
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
70
71 Lookup is plain linear search until the first match with selector.
72
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
79
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
83 |---. child .-> NULL
84
85 Bundles are cached at xrfm_policy struct (field ->bundles).
86
87
88 Resolution of xrfm_tmpl
89 -----------------------
90 Template contains:
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
101 flow id?
102
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
106
107 PROBLEMS:
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116 */
117
118struct xfrm_state_walk {
119 struct list_head all;
120 u8 state;
121 u8 dying;
122 u8 proto;
123 u32 seq;
124 struct xfrm_address_filter *filter;
125};
126
127/* Full description of state of transformer. */
128struct xfrm_state {
129#ifdef CONFIG_NET_NS
130 struct net *xs_net;
131#endif
132 union {
133 struct hlist_node gclist;
134 struct hlist_node bydst;
135 };
136 struct hlist_node bysrc;
137 struct hlist_node byspi;
138
139 atomic_t refcnt;
140 spinlock_t lock;
141
142 struct xfrm_id id;
143 struct xfrm_selector sel;
144 struct xfrm_mark mark;
145 u32 tfcpad;
146
147 u32 genid;
148
149 /* Key manager bits */
150 struct xfrm_state_walk km;
151
152 /* Parameters of this state. */
153 struct {
154 u32 reqid;
155 u8 mode;
156 u8 replay_window;
157 u8 aalgo, ealgo, calgo;
158 u8 flags;
159 u16 family;
160 xfrm_address_t saddr;
161 int header_len;
162 int trailer_len;
163 u32 extra_flags;
164 } props;
165
166 struct xfrm_lifetime_cfg lft;
167
168 /* Data for transformer */
169 struct xfrm_algo_auth *aalg;
170 struct xfrm_algo *ealg;
171 struct xfrm_algo *calg;
172 struct xfrm_algo_aead *aead;
173
174 /* Data for encapsulator */
175 struct xfrm_encap_tmpl *encap;
176
177 /* Data for care-of address */
178 xfrm_address_t *coaddr;
179
180 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
181 struct xfrm_state *tunnel;
182
183 /* If a tunnel, number of users + 1 */
184 atomic_t tunnel_users;
185
186 /* State for replay detection */
187 struct xfrm_replay_state replay;
188 struct xfrm_replay_state_esn *replay_esn;
189
190 /* Replay detection state at the time we sent the last notification */
191 struct xfrm_replay_state preplay;
192 struct xfrm_replay_state_esn *preplay_esn;
193
194 /* The functions for replay detection. */
195 struct xfrm_replay *repl;
196
197 /* internal flag that only holds state for delayed aevent at the
198 * moment
199 */
200 u32 xflags;
201
202 /* Replay detection notification settings */
203 u32 replay_maxage;
204 u32 replay_maxdiff;
205
206 /* Replay detection notification timer */
207 struct timer_list rtimer;
208
209 /* Statistics */
210 struct xfrm_stats stats;
211
212 struct xfrm_lifetime_cur curlft;
213 struct tasklet_hrtimer mtimer;
214
215 /* used to fix curlft->add_time when changing date */
216 long saved_tmo;
217
218 /* Last used time */
219 unsigned long lastused;
220
221 /* Reference to data common to all the instances of this
222 * transformer. */
223 const struct xfrm_type *type;
224 struct xfrm_mode *inner_mode;
225 struct xfrm_mode *inner_mode_iaf;
226 struct xfrm_mode *outer_mode;
227
228 /* Security context */
229 struct xfrm_sec_ctx *security;
230
231 /* Private data of this transformer, format is opaque,
232 * interpreted by xfrm_type methods. */
233 void *data;
234};
235
236static inline struct net *xs_net(struct xfrm_state *x)
237{
238 return read_pnet(&x->xs_net);
239}
240
241/* xflags - make enum if more show up */
242#define XFRM_TIME_DEFER 1
243#define XFRM_SOFT_EXPIRE 2
244
245enum {
246 XFRM_STATE_VOID,
247 XFRM_STATE_ACQ,
248 XFRM_STATE_VALID,
249 XFRM_STATE_ERROR,
250 XFRM_STATE_EXPIRED,
251 XFRM_STATE_DEAD
252};
253
254/* callback structure passed from either netlink or pfkey */
255struct km_event {
256 union {
257 u32 hard;
258 u32 proto;
259 u32 byid;
260 u32 aevent;
261 u32 type;
262 } data;
263
264 u32 seq;
265 u32 portid;
266 u32 event;
267 struct net *net;
268};
269
270struct xfrm_replay {
271 void (*advance)(struct xfrm_state *x, __be32 net_seq);
272 int (*check)(struct xfrm_state *x,
273 struct sk_buff *skb,
274 __be32 net_seq);
275 int (*recheck)(struct xfrm_state *x,
276 struct sk_buff *skb,
277 __be32 net_seq);
278 void (*notify)(struct xfrm_state *x, int event);
279 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
280};
281
282struct net_device;
283struct xfrm_type;
284struct xfrm_dst;
285struct xfrm_policy_afinfo {
286 unsigned short family;
287 struct dst_ops *dst_ops;
288 void (*garbage_collect)(struct net *net);
289 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
290 const xfrm_address_t *saddr,
291 const xfrm_address_t *daddr);
292 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
293 void (*decode_session)(struct sk_buff *skb,
294 struct flowi *fl,
295 int reverse);
296 int (*get_tos)(const struct flowi *fl);
297 void (*init_dst)(struct net *net,
298 struct xfrm_dst *dst);
299 int (*init_path)(struct xfrm_dst *path,
300 struct dst_entry *dst,
301 int nfheader_len);
302 int (*fill_dst)(struct xfrm_dst *xdst,
303 struct net_device *dev,
304 const struct flowi *fl);
305 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
306};
307
308int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
309int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
310void km_policy_notify(struct xfrm_policy *xp, int dir,
311 const struct km_event *c);
312void km_state_notify(struct xfrm_state *x, const struct km_event *c);
313
314struct xfrm_tmpl;
315int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
316 struct xfrm_policy *pol);
317void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
318int __xfrm_state_delete(struct xfrm_state *x);
319
320struct xfrm_state_afinfo {
321 unsigned int family;
322 unsigned int proto;
323 __be16 eth_proto;
324 struct module *owner;
325 const struct xfrm_type *type_map[IPPROTO_MAX];
326 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
327 int (*init_flags)(struct xfrm_state *x);
328 void (*init_tempsel)(struct xfrm_selector *sel,
329 const struct flowi *fl);
330 void (*init_temprop)(struct xfrm_state *x,
331 const struct xfrm_tmpl *tmpl,
332 const xfrm_address_t *daddr,
333 const xfrm_address_t *saddr);
334 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
335 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
336 int (*output)(struct sock *sk, struct sk_buff *skb);
337 int (*output_finish)(struct sk_buff *skb);
338 int (*extract_input)(struct xfrm_state *x,
339 struct sk_buff *skb);
340 int (*extract_output)(struct xfrm_state *x,
341 struct sk_buff *skb);
342 int (*transport_finish)(struct sk_buff *skb,
343 int async);
344 void (*local_error)(struct sk_buff *skb, u32 mtu);
345};
346
347int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
348int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
349struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
350void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
351
352struct xfrm_input_afinfo {
353 unsigned int family;
354 struct module *owner;
355 int (*callback)(struct sk_buff *skb, u8 protocol,
356 int err);
357};
358
359int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
360int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
361
362void xfrm_state_delete_tunnel(struct xfrm_state *x);
363
364struct xfrm_type {
365 char *description;
366 struct module *owner;
367 u8 proto;
368 u8 flags;
369#define XFRM_TYPE_NON_FRAGMENT 1
370#define XFRM_TYPE_REPLAY_PROT 2
371#define XFRM_TYPE_LOCAL_COADDR 4
372#define XFRM_TYPE_REMOTE_COADDR 8
373
374 int (*init_state)(struct xfrm_state *x);
375 void (*destructor)(struct xfrm_state *);
376 int (*input)(struct xfrm_state *, struct sk_buff *skb);
377 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
378 int (*reject)(struct xfrm_state *, struct sk_buff *,
379 const struct flowi *);
380 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
381 /* Estimate maximal size of result of transformation of a dgram */
382 u32 (*get_mtu)(struct xfrm_state *, int size);
383};
384
385int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
386int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
387
388struct xfrm_mode {
389 /*
390 * Remove encapsulation header.
391 *
392 * The IP header will be moved over the top of the encapsulation
393 * header.
394 *
395 * On entry, the transport header shall point to where the IP header
396 * should be and the network header shall be set to where the IP
397 * header currently is. skb->data shall point to the start of the
398 * payload.
399 */
400 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
401
402 /*
403 * This is the actual input entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * input2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to the tunnel encapsulation function
408 * xfrm4_prepare_input that would in turn call input2.
409 */
410 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
411
412 /*
413 * Add encapsulation header.
414 *
415 * On exit, the transport header will be set to the start of the
416 * encapsulation header to be filled in by x->type->output and
417 * the mac header will be set to the nextheader (protocol for
418 * IPv4) field of the extension header directly preceding the
419 * encapsulation header, or in its absence, that of the top IP
420 * header. The value of the network header will always point
421 * to the top IP header while skb->data will point to the payload.
422 */
423 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
424
425 /*
426 * This is the actual output entry point.
427 *
428 * For transport mode and equivalent this would be identical to
429 * output2 (which does not need to be set). While tunnel mode
430 * and equivalent would set this to a tunnel encapsulation function
431 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
432 * call output2.
433 */
434 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
435
436 struct xfrm_state_afinfo *afinfo;
437 struct module *owner;
438 unsigned int encap;
439 int flags;
440};
441
442/* Flags for xfrm_mode. */
443enum {
444 XFRM_MODE_FLAG_TUNNEL = 1,
445};
446
447int xfrm_register_mode(struct xfrm_mode *mode, int family);
448int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
449
450static inline int xfrm_af2proto(unsigned int family)
451{
452 switch(family) {
453 case AF_INET:
454 return IPPROTO_IPIP;
455 case AF_INET6:
456 return IPPROTO_IPV6;
457 default:
458 return 0;
459 }
460}
461
462static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
463{
464 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
465 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
466 return x->inner_mode;
467 else
468 return x->inner_mode_iaf;
469}
470
471struct xfrm_tmpl {
472/* id in template is interpreted as:
473 * daddr - destination of tunnel, may be zero for transport mode.
474 * spi - zero to acquire spi. Not zero if spi is static, then
475 * daddr must be fixed too.
476 * proto - AH/ESP/IPCOMP
477 */
478 struct xfrm_id id;
479
480/* Source address of tunnel. Ignored, if it is not a tunnel. */
481 xfrm_address_t saddr;
482
483 unsigned short encap_family;
484
485 u32 reqid;
486
487/* Mode: transport, tunnel etc. */
488 u8 mode;
489
490/* Sharing mode: unique, this session only, this user only etc. */
491 u8 share;
492
493/* May skip this transfomration if no SA is found */
494 u8 optional;
495
496/* Skip aalgos/ealgos/calgos checks. */
497 u8 allalgs;
498
499/* Bit mask of algos allowed for acquisition */
500 u32 aalgos;
501 u32 ealgos;
502 u32 calgos;
503};
504
505#define XFRM_MAX_DEPTH 6
506
507struct xfrm_policy_walk_entry {
508 struct list_head all;
509 u8 dead;
510};
511
512struct xfrm_policy_walk {
513 struct xfrm_policy_walk_entry walk;
514 u8 type;
515 u32 seq;
516};
517
518struct xfrm_policy_queue {
519 struct sk_buff_head hold_queue;
520 struct timer_list hold_timer;
521 unsigned long timeout;
522};
523
524struct xfrm_policy {
525#ifdef CONFIG_NET_NS
526 struct net *xp_net;
527#endif
528 struct hlist_node bydst;
529 struct hlist_node byidx;
530
531 /* This lock only affects elements except for entry. */
532 rwlock_t lock;
533 atomic_t refcnt;
534 struct timer_list timer;
535
536 struct flow_cache_object flo;
537 atomic_t genid;
538 u32 priority;
539 u32 index;
540 struct xfrm_mark mark;
541 struct xfrm_selector selector;
542 struct xfrm_lifetime_cfg lft;
543 struct xfrm_lifetime_cur curlft;
544 struct xfrm_policy_walk_entry walk;
545 struct xfrm_policy_queue polq;
546 u8 type;
547 u8 action;
548 u8 flags;
549 u8 xfrm_nr;
550 u16 family;
551 struct xfrm_sec_ctx *security;
552 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
553};
554
555static inline struct net *xp_net(const struct xfrm_policy *xp)
556{
557 return read_pnet(&xp->xp_net);
558}
559
560struct xfrm_kmaddress {
561 xfrm_address_t local;
562 xfrm_address_t remote;
563 u32 reserved;
564 u16 family;
565};
566
567struct xfrm_migrate {
568 xfrm_address_t old_daddr;
569 xfrm_address_t old_saddr;
570 xfrm_address_t new_daddr;
571 xfrm_address_t new_saddr;
572 u8 proto;
573 u8 mode;
574 u16 reserved;
575 u32 reqid;
576 u16 old_family;
577 u16 new_family;
578};
579
580#define XFRM_KM_TIMEOUT 30
581/* what happened */
582#define XFRM_REPLAY_UPDATE XFRM_AE_CR
583#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
584
585/* default aevent timeout in units of 100ms */
586#define XFRM_AE_ETIME 10
587/* Async Event timer multiplier */
588#define XFRM_AE_ETH_M 10
589/* default seq threshold size */
590#define XFRM_AE_SEQT_SIZE 2
591
592struct xfrm_mgr {
593 struct list_head list;
594 char *id;
595 int (*notify)(struct xfrm_state *x, const struct km_event *c);
596 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
597 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
598 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
599 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
600 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
601 int (*migrate)(const struct xfrm_selector *sel,
602 u8 dir, u8 type,
603 const struct xfrm_migrate *m,
604 int num_bundles,
605 const struct xfrm_kmaddress *k);
606 bool (*is_alive)(const struct km_event *c);
607};
608
609int xfrm_register_km(struct xfrm_mgr *km);
610int xfrm_unregister_km(struct xfrm_mgr *km);
611
612struct xfrm_tunnel_skb_cb {
613 union {
614 struct inet_skb_parm h4;
615 struct inet6_skb_parm h6;
616 } header;
617
618 union {
619 struct ip_tunnel *ip4;
620 struct ip6_tnl *ip6;
621 } tunnel;
622};
623
624#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
625
626/*
627 * This structure is used for the duration where packets are being
628 * transformed by IPsec. As soon as the packet leaves IPsec the
629 * area beyond the generic IP part may be overwritten.
630 */
631struct xfrm_skb_cb {
632 struct xfrm_tunnel_skb_cb header;
633
634 /* Sequence number for replay protection. */
635 union {
636 struct {
637 __u32 low;
638 __u32 hi;
639 } output;
640 struct {
641 __be32 low;
642 __be32 hi;
643 } input;
644 } seq;
645};
646
647#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
648
649/*
650 * This structure is used by the afinfo prepare_input/prepare_output functions
651 * to transmit header information to the mode input/output functions.
652 */
653struct xfrm_mode_skb_cb {
654 struct xfrm_tunnel_skb_cb header;
655
656 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
657 __be16 id;
658 __be16 frag_off;
659
660 /* IP header length (excluding options or extension headers). */
661 u8 ihl;
662
663 /* TOS for IPv4, class for IPv6. */
664 u8 tos;
665
666 /* TTL for IPv4, hop limitfor IPv6. */
667 u8 ttl;
668
669 /* Protocol for IPv4, NH for IPv6. */
670 u8 protocol;
671
672 /* Option length for IPv4, zero for IPv6. */
673 u8 optlen;
674
675 /* Used by IPv6 only, zero for IPv4. */
676 u8 flow_lbl[3];
677};
678
679#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
680
681/*
682 * This structure is used by the input processing to locate the SPI and
683 * related information.
684 */
685struct xfrm_spi_skb_cb {
686 struct xfrm_tunnel_skb_cb header;
687
688 unsigned int daddroff;
689 unsigned int family;
690};
691
692#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
693
694/* Audit Information */
695struct xfrm_audit {
696 u32 secid;
697 kuid_t loginuid;
698 unsigned int sessionid;
699};
700
701#ifdef CONFIG_AUDITSYSCALL
702static inline struct audit_buffer *xfrm_audit_start(const char *op)
703{
704 struct audit_buffer *audit_buf = NULL;
705
706 if (audit_enabled == 0)
707 return NULL;
708 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
709 AUDIT_MAC_IPSEC_EVENT);
710 if (audit_buf == NULL)
711 return NULL;
712 audit_log_format(audit_buf, "op=%s", op);
713 return audit_buf;
714}
715
716static inline void xfrm_audit_helper_usrinfo(kuid_t auid, unsigned int ses, u32 secid,
717 struct audit_buffer *audit_buf)
718{
719 char *secctx;
720 u32 secctx_len;
721
722 audit_log_format(audit_buf, " auid=%u ses=%u",
723 from_kuid(&init_user_ns, auid), ses);
724 if (secid != 0 &&
725 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
726 audit_log_format(audit_buf, " subj=%s", secctx);
727 security_release_secctx(secctx, secctx_len);
728 } else
729 audit_log_task_context(audit_buf);
730}
731
732void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, kuid_t auid,
733 unsigned int ses, u32 secid);
734void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, kuid_t auid,
735 unsigned int ses, u32 secid);
736void xfrm_audit_state_add(struct xfrm_state *x, int result, kuid_t auid,
737 unsigned int ses, u32 secid);
738void xfrm_audit_state_delete(struct xfrm_state *x, int result, kuid_t auid,
739 unsigned int ses, u32 secid);
740void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
741 struct sk_buff *skb);
742void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
743 __be32 net_seq);
744void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
745void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
746 __be32 net_seq);
747void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
748 u8 proto);
749#else
750
751static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
752 kuid_t auid, unsigned int ses, u32 secid)
753{
754}
755
756static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
757 kuid_t auid, unsigned int ses, u32 secid)
758{
759}
760
761static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
762 kuid_t auid, unsigned int ses, u32 secid)
763{
764}
765
766static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
767 kuid_t auid, unsigned int ses, u32 secid)
768{
769}
770
771static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
772 struct sk_buff *skb)
773{
774}
775
776static inline void xfrm_audit_state_replay(struct xfrm_state *x,
777 struct sk_buff *skb, __be32 net_seq)
778{
779}
780
781static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
782 u16 family)
783{
784}
785
786static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
787 __be32 net_spi, __be32 net_seq)
788{
789}
790
791static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
792 struct sk_buff *skb, u8 proto)
793{
794}
795#endif /* CONFIG_AUDITSYSCALL */
796
797static inline void xfrm_pol_hold(struct xfrm_policy *policy)
798{
799 if (likely(policy != NULL))
800 atomic_inc(&policy->refcnt);
801}
802
803void xfrm_policy_destroy(struct xfrm_policy *policy);
804
805static inline void xfrm_pol_put(struct xfrm_policy *policy)
806{
807 if (atomic_dec_and_test(&policy->refcnt))
808 xfrm_policy_destroy(policy);
809}
810
811static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
812{
813 int i;
814 for (i = npols - 1; i >= 0; --i)
815 xfrm_pol_put(pols[i]);
816}
817
818void __xfrm_state_destroy(struct xfrm_state *);
819
820static inline void __xfrm_state_put(struct xfrm_state *x)
821{
822 atomic_dec(&x->refcnt);
823}
824
825static inline void xfrm_state_put(struct xfrm_state *x)
826{
827 if (atomic_dec_and_test(&x->refcnt))
828 __xfrm_state_destroy(x);
829}
830
831static inline void xfrm_state_hold(struct xfrm_state *x)
832{
833 atomic_inc(&x->refcnt);
834}
835
836static inline bool addr_match(const void *token1, const void *token2,
837 int prefixlen)
838{
839 const __be32 *a1 = token1;
840 const __be32 *a2 = token2;
841 int pdw;
842 int pbi;
843
844 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
845 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
846
847 if (pdw)
848 if (memcmp(a1, a2, pdw << 2))
849 return false;
850
851 if (pbi) {
852 __be32 mask;
853
854 mask = htonl((0xffffffff) << (32 - pbi));
855
856 if ((a1[pdw] ^ a2[pdw]) & mask)
857 return false;
858 }
859
860 return true;
861}
862
863static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
864{
865 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
866 if (prefixlen == 0)
867 return true;
868 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
869}
870
871static __inline__
872__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
873{
874 __be16 port;
875 switch(fl->flowi_proto) {
876 case IPPROTO_TCP:
877 case IPPROTO_UDP:
878 case IPPROTO_UDPLITE:
879 case IPPROTO_SCTP:
880 port = uli->ports.sport;
881 break;
882 case IPPROTO_ICMP:
883 case IPPROTO_ICMPV6:
884 port = htons(uli->icmpt.type);
885 break;
886 case IPPROTO_MH:
887 port = htons(uli->mht.type);
888 break;
889 case IPPROTO_GRE:
890 port = htons(ntohl(uli->gre_key) >> 16);
891 break;
892 default:
893 port = 0; /*XXX*/
894 }
895 return port;
896}
897
898static __inline__
899__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
900{
901 __be16 port;
902 switch(fl->flowi_proto) {
903 case IPPROTO_TCP:
904 case IPPROTO_UDP:
905 case IPPROTO_UDPLITE:
906 case IPPROTO_SCTP:
907 port = uli->ports.dport;
908 break;
909 case IPPROTO_ICMP:
910 case IPPROTO_ICMPV6:
911 port = htons(uli->icmpt.code);
912 break;
913 case IPPROTO_GRE:
914 port = htons(ntohl(uli->gre_key) & 0xffff);
915 break;
916 default:
917 port = 0; /*XXX*/
918 }
919 return port;
920}
921
922bool xfrm_selector_match(const struct xfrm_selector *sel,
923 const struct flowi *fl, unsigned short family);
924
925#ifdef CONFIG_SECURITY_NETWORK_XFRM
926/* If neither has a context --> match
927 * Otherwise, both must have a context and the sids, doi, alg must match
928 */
929static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
930{
931 return ((!s1 && !s2) ||
932 (s1 && s2 &&
933 (s1->ctx_sid == s2->ctx_sid) &&
934 (s1->ctx_doi == s2->ctx_doi) &&
935 (s1->ctx_alg == s2->ctx_alg)));
936}
937#else
938static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
939{
940 return true;
941}
942#endif
943
944/* A struct encoding bundle of transformations to apply to some set of flow.
945 *
946 * dst->child points to the next element of bundle.
947 * dst->xfrm points to an instanse of transformer.
948 *
949 * Due to unfortunate limitations of current routing cache, which we
950 * have no time to fix, it mirrors struct rtable and bound to the same
951 * routing key, including saddr,daddr. However, we can have many of
952 * bundles differing by session id. All the bundles grow from a parent
953 * policy rule.
954 */
955struct xfrm_dst {
956 union {
957 struct dst_entry dst;
958 struct rtable rt;
959 struct rt6_info rt6;
960 } u;
961 struct dst_entry *route;
962 struct flow_cache_object flo;
963 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
964 int num_pols, num_xfrms;
965#ifdef CONFIG_XFRM_SUB_POLICY
966 struct flowi *origin;
967 struct xfrm_selector *partner;
968#endif
969 u32 xfrm_genid;
970 u32 policy_genid;
971 u32 route_mtu_cached;
972 u32 child_mtu_cached;
973 u32 route_cookie;
974 u32 path_cookie;
975};
976
977#ifdef CONFIG_XFRM
978static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
979{
980 xfrm_pols_put(xdst->pols, xdst->num_pols);
981 dst_release(xdst->route);
982 if (likely(xdst->u.dst.xfrm))
983 xfrm_state_put(xdst->u.dst.xfrm);
984#ifdef CONFIG_XFRM_SUB_POLICY
985 kfree(xdst->origin);
986 xdst->origin = NULL;
987 kfree(xdst->partner);
988 xdst->partner = NULL;
989#endif
990}
991#endif
992
993void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
994
995struct sec_path {
996 atomic_t refcnt;
997 int len;
998 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
999};
1000
1001static inline int secpath_exists(struct sk_buff *skb)
1002{
1003#ifdef CONFIG_XFRM
1004 return skb->sp != NULL;
1005#else
1006 return 0;
1007#endif
1008}
1009
1010static inline struct sec_path *
1011secpath_get(struct sec_path *sp)
1012{
1013 if (sp)
1014 atomic_inc(&sp->refcnt);
1015 return sp;
1016}
1017
1018void __secpath_destroy(struct sec_path *sp);
1019
1020static inline void
1021secpath_put(struct sec_path *sp)
1022{
1023 if (sp && atomic_dec_and_test(&sp->refcnt))
1024 __secpath_destroy(sp);
1025}
1026
1027struct sec_path *secpath_dup(struct sec_path *src);
1028
1029static inline void
1030secpath_reset(struct sk_buff *skb)
1031{
1032#ifdef CONFIG_XFRM
1033 secpath_put(skb->sp);
1034 skb->sp = NULL;
1035#endif
1036}
1037
1038static inline int
1039xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1040{
1041 switch (family) {
1042 case AF_INET:
1043 return addr->a4 == 0;
1044 case AF_INET6:
1045 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1046 }
1047 return 0;
1048}
1049
1050static inline int
1051__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1052{
1053 return (tmpl->saddr.a4 &&
1054 tmpl->saddr.a4 != x->props.saddr.a4);
1055}
1056
1057static inline int
1058__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1059{
1060 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1061 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1062}
1063
1064static inline int
1065xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1066{
1067 switch (family) {
1068 case AF_INET:
1069 return __xfrm4_state_addr_cmp(tmpl, x);
1070 case AF_INET6:
1071 return __xfrm6_state_addr_cmp(tmpl, x);
1072 }
1073 return !0;
1074}
1075
1076#ifdef CONFIG_XFRM
1077int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1078 unsigned short family);
1079
1080static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1081 struct sk_buff *skb,
1082 unsigned int family, int reverse)
1083{
1084 struct net *net = dev_net(skb->dev);
1085 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1086
1087 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1088 return __xfrm_policy_check(sk, ndir, skb, family);
1089
1090 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1091 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1092 __xfrm_policy_check(sk, ndir, skb, family);
1093}
1094
1095static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1096{
1097 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1098}
1099
1100static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1101{
1102 return xfrm_policy_check(sk, dir, skb, AF_INET);
1103}
1104
1105static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1106{
1107 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1108}
1109
1110static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1111 struct sk_buff *skb)
1112{
1113 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1114}
1115
1116static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1117 struct sk_buff *skb)
1118{
1119 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1120}
1121
1122int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1123 unsigned int family, int reverse);
1124
1125static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1126 unsigned int family)
1127{
1128 return __xfrm_decode_session(skb, fl, family, 0);
1129}
1130
1131static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1132 struct flowi *fl,
1133 unsigned int family)
1134{
1135 return __xfrm_decode_session(skb, fl, family, 1);
1136}
1137
1138int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1139
1140static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1141{
1142 struct net *net = dev_net(skb->dev);
1143
1144 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1145 (skb_dst(skb)->flags & DST_NOXFRM) ||
1146 __xfrm_route_forward(skb, family);
1147}
1148
1149static inline int xfrm4_route_forward(struct sk_buff *skb)
1150{
1151 return xfrm_route_forward(skb, AF_INET);
1152}
1153
1154static inline int xfrm6_route_forward(struct sk_buff *skb)
1155{
1156 return xfrm_route_forward(skb, AF_INET6);
1157}
1158
1159int __xfrm_sk_clone_policy(struct sock *sk);
1160
1161static inline int xfrm_sk_clone_policy(struct sock *sk)
1162{
1163 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1164 return __xfrm_sk_clone_policy(sk);
1165 return 0;
1166}
1167
1168int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1169
1170static inline void xfrm_sk_free_policy(struct sock *sk)
1171{
1172 if (unlikely(sk->sk_policy[0] != NULL)) {
1173 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1174 sk->sk_policy[0] = NULL;
1175 }
1176 if (unlikely(sk->sk_policy[1] != NULL)) {
1177 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1178 sk->sk_policy[1] = NULL;
1179 }
1180}
1181
1182void xfrm_garbage_collect(struct net *net);
1183
1184#else
1185
1186static inline void xfrm_sk_free_policy(struct sock *sk) {}
1187static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1188static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1189static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1190static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1191{
1192 return 1;
1193}
1194static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1195{
1196 return 1;
1197}
1198static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1199{
1200 return 1;
1201}
1202static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1203 struct flowi *fl,
1204 unsigned int family)
1205{
1206 return -ENOSYS;
1207}
1208static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1209 struct sk_buff *skb)
1210{
1211 return 1;
1212}
1213static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1214 struct sk_buff *skb)
1215{
1216 return 1;
1217}
1218static inline void xfrm_garbage_collect(struct net *net)
1219{
1220}
1221#endif
1222
1223static __inline__
1224xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1225{
1226 switch (family){
1227 case AF_INET:
1228 return (xfrm_address_t *)&fl->u.ip4.daddr;
1229 case AF_INET6:
1230 return (xfrm_address_t *)&fl->u.ip6.daddr;
1231 }
1232 return NULL;
1233}
1234
1235static __inline__
1236xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1237{
1238 switch (family){
1239 case AF_INET:
1240 return (xfrm_address_t *)&fl->u.ip4.saddr;
1241 case AF_INET6:
1242 return (xfrm_address_t *)&fl->u.ip6.saddr;
1243 }
1244 return NULL;
1245}
1246
1247static __inline__
1248void xfrm_flowi_addr_get(const struct flowi *fl,
1249 xfrm_address_t *saddr, xfrm_address_t *daddr,
1250 unsigned short family)
1251{
1252 switch(family) {
1253 case AF_INET:
1254 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1255 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1256 break;
1257 case AF_INET6:
1258 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1259 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1260 break;
1261 }
1262}
1263
1264static __inline__ int
1265__xfrm4_state_addr_check(const struct xfrm_state *x,
1266 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1267{
1268 if (daddr->a4 == x->id.daddr.a4 &&
1269 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1270 return 1;
1271 return 0;
1272}
1273
1274static __inline__ int
1275__xfrm6_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277{
1278 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1279 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1280 ipv6_addr_any((struct in6_addr *)saddr) ||
1281 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1282 return 1;
1283 return 0;
1284}
1285
1286static __inline__ int
1287xfrm_state_addr_check(const struct xfrm_state *x,
1288 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1289 unsigned short family)
1290{
1291 switch (family) {
1292 case AF_INET:
1293 return __xfrm4_state_addr_check(x, daddr, saddr);
1294 case AF_INET6:
1295 return __xfrm6_state_addr_check(x, daddr, saddr);
1296 }
1297 return 0;
1298}
1299
1300static __inline__ int
1301xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1302 unsigned short family)
1303{
1304 switch (family) {
1305 case AF_INET:
1306 return __xfrm4_state_addr_check(x,
1307 (const xfrm_address_t *)&fl->u.ip4.daddr,
1308 (const xfrm_address_t *)&fl->u.ip4.saddr);
1309 case AF_INET6:
1310 return __xfrm6_state_addr_check(x,
1311 (const xfrm_address_t *)&fl->u.ip6.daddr,
1312 (const xfrm_address_t *)&fl->u.ip6.saddr);
1313 }
1314 return 0;
1315}
1316
1317static inline int xfrm_state_kern(const struct xfrm_state *x)
1318{
1319 return atomic_read(&x->tunnel_users);
1320}
1321
1322static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1323{
1324 return (!userproto || proto == userproto ||
1325 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1326 proto == IPPROTO_ESP ||
1327 proto == IPPROTO_COMP)));
1328}
1329
1330/*
1331 * xfrm algorithm information
1332 */
1333struct xfrm_algo_aead_info {
1334 u16 icv_truncbits;
1335};
1336
1337struct xfrm_algo_auth_info {
1338 u16 icv_truncbits;
1339 u16 icv_fullbits;
1340};
1341
1342struct xfrm_algo_encr_info {
1343 u16 blockbits;
1344 u16 defkeybits;
1345};
1346
1347struct xfrm_algo_comp_info {
1348 u16 threshold;
1349};
1350
1351struct xfrm_algo_desc {
1352 char *name;
1353 char *compat;
1354 u8 available:1;
1355 u8 pfkey_supported:1;
1356 union {
1357 struct xfrm_algo_aead_info aead;
1358 struct xfrm_algo_auth_info auth;
1359 struct xfrm_algo_encr_info encr;
1360 struct xfrm_algo_comp_info comp;
1361 } uinfo;
1362 struct sadb_alg desc;
1363};
1364
1365/* XFRM protocol handlers. */
1366struct xfrm4_protocol {
1367 int (*handler)(struct sk_buff *skb);
1368 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1369 int encap_type);
1370 int (*cb_handler)(struct sk_buff *skb, int err);
1371 int (*err_handler)(struct sk_buff *skb, u32 info);
1372
1373 struct xfrm4_protocol __rcu *next;
1374 int priority;
1375};
1376
1377struct xfrm6_protocol {
1378 int (*handler)(struct sk_buff *skb);
1379 int (*cb_handler)(struct sk_buff *skb, int err);
1380 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1381 u8 type, u8 code, int offset, __be32 info);
1382
1383 struct xfrm6_protocol __rcu *next;
1384 int priority;
1385};
1386
1387/* XFRM tunnel handlers. */
1388struct xfrm_tunnel {
1389 int (*handler)(struct sk_buff *skb);
1390 int (*err_handler)(struct sk_buff *skb, u32 info);
1391
1392 struct xfrm_tunnel __rcu *next;
1393 int priority;
1394};
1395
1396struct xfrm6_tunnel {
1397 int (*handler)(struct sk_buff *skb);
1398 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1399 u8 type, u8 code, int offset, __be32 info);
1400 struct xfrm6_tunnel __rcu *next;
1401 int priority;
1402};
1403
1404void xfrm_init(void);
1405void xfrm4_init(void);
1406int xfrm_state_init(struct net *net);
1407void xfrm_state_fini(struct net *net);
1408void xfrm4_state_init(void);
1409void xfrm4_protocol_init(void);
1410#ifdef CONFIG_XFRM
1411int xfrm6_init(void);
1412void xfrm6_fini(void);
1413int xfrm6_state_init(void);
1414void xfrm6_state_fini(void);
1415int xfrm6_protocol_init(void);
1416void xfrm6_protocol_fini(void);
1417#else
1418static inline int xfrm6_init(void)
1419{
1420 return 0;
1421}
1422static inline void xfrm6_fini(void)
1423{
1424 ;
1425}
1426#endif
1427
1428#ifdef CONFIG_XFRM_STATISTICS
1429int xfrm_proc_init(struct net *net);
1430void xfrm_proc_fini(struct net *net);
1431#endif
1432
1433int xfrm_sysctl_init(struct net *net);
1434#ifdef CONFIG_SYSCTL
1435void xfrm_sysctl_fini(struct net *net);
1436#else
1437static inline void xfrm_sysctl_fini(struct net *net)
1438{
1439}
1440#endif
1441
1442void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1443 struct xfrm_address_filter *filter);
1444int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1445 int (*func)(struct xfrm_state *, int, void*), void *);
1446void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1447struct xfrm_state *xfrm_state_alloc(struct net *net);
1448struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1449 const xfrm_address_t *saddr,
1450 const struct flowi *fl,
1451 struct xfrm_tmpl *tmpl,
1452 struct xfrm_policy *pol, int *err,
1453 unsigned short family);
1454struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1455 xfrm_address_t *daddr,
1456 xfrm_address_t *saddr,
1457 unsigned short family,
1458 u8 mode, u8 proto, u32 reqid);
1459struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1460 unsigned short family);
1461int xfrm_state_check_expire(struct xfrm_state *x);
1462void xfrm_state_insert(struct xfrm_state *x);
1463int xfrm_state_add(struct xfrm_state *x);
1464int xfrm_state_update(struct xfrm_state *x);
1465struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1466 const xfrm_address_t *daddr, __be32 spi,
1467 u8 proto, unsigned short family);
1468struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1469 const xfrm_address_t *daddr,
1470 const xfrm_address_t *saddr,
1471 u8 proto,
1472 unsigned short family);
1473#ifdef CONFIG_XFRM_SUB_POLICY
1474int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1475 unsigned short family, struct net *net);
1476int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1477 unsigned short family);
1478#else
1479static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1480 int n, unsigned short family, struct net *net)
1481{
1482 return -ENOSYS;
1483}
1484
1485static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1486 int n, unsigned short family)
1487{
1488 return -ENOSYS;
1489}
1490#endif
1491
1492struct xfrmk_sadinfo {
1493 u32 sadhcnt; /* current hash bkts */
1494 u32 sadhmcnt; /* max allowed hash bkts */
1495 u32 sadcnt; /* current running count */
1496};
1497
1498struct xfrmk_spdinfo {
1499 u32 incnt;
1500 u32 outcnt;
1501 u32 fwdcnt;
1502 u32 inscnt;
1503 u32 outscnt;
1504 u32 fwdscnt;
1505 u32 spdhcnt;
1506 u32 spdhmcnt;
1507};
1508
1509struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1510int xfrm_state_delete(struct xfrm_state *x);
1511int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1512void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1513void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1514u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1515int xfrm_init_replay(struct xfrm_state *x);
1516int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1517int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1518int xfrm_init_state(struct xfrm_state *x);
1519int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1520int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1521int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1522int xfrm_output_resume(struct sk_buff *skb, int err);
1523int xfrm_output(struct sk_buff *skb);
1524int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1525void xfrm_local_error(struct sk_buff *skb, int mtu);
1526int xfrm4_extract_header(struct sk_buff *skb);
1527int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1528int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1529 int encap_type);
1530int xfrm4_transport_finish(struct sk_buff *skb, int async);
1531int xfrm4_rcv(struct sk_buff *skb);
1532
1533static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1534{
1535 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1536 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1537 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1538 return xfrm_input(skb, nexthdr, spi, 0);
1539}
1540
1541int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1542int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1543int xfrm4_output(struct sock *sk, struct sk_buff *skb);
1544int xfrm4_output_finish(struct sk_buff *skb);
1545int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1546int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1547int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1548int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1549int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1550void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1551int xfrm6_extract_header(struct sk_buff *skb);
1552int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1553int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1554int xfrm6_transport_finish(struct sk_buff *skb, int async);
1555int xfrm6_rcv(struct sk_buff *skb);
1556int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1557 xfrm_address_t *saddr, u8 proto);
1558void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1559int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1560int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1561int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1562int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1563int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1564__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1565__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1566int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1567int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1568int xfrm6_output(struct sock *sk, struct sk_buff *skb);
1569int xfrm6_output_finish(struct sk_buff *skb);
1570int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1571 u8 **prevhdr);
1572
1573#ifdef CONFIG_XFRM
1574int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1575int xfrm_user_policy(struct sock *sk, int optname,
1576 u8 __user *optval, int optlen);
1577#else
1578static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1579{
1580 return -ENOPROTOOPT;
1581}
1582
1583static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1584{
1585 /* should not happen */
1586 kfree_skb(skb);
1587 return 0;
1588}
1589#endif
1590
1591struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1592
1593void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1594int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1595 int (*func)(struct xfrm_policy *, int, int, void*),
1596 void *);
1597void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1598int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1599struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1600 u8 type, int dir,
1601 struct xfrm_selector *sel,
1602 struct xfrm_sec_ctx *ctx, int delete,
1603 int *err);
1604struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1605 u32 id, int delete, int *err);
1606int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1607u32 xfrm_get_acqseq(void);
1608int verify_spi_info(u8 proto, u32 min, u32 max);
1609int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1610struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1611 u8 mode, u32 reqid, u8 proto,
1612 const xfrm_address_t *daddr,
1613 const xfrm_address_t *saddr, int create,
1614 unsigned short family);
1615int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1616
1617#ifdef CONFIG_XFRM_MIGRATE
1618int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1619 const struct xfrm_migrate *m, int num_bundles,
1620 const struct xfrm_kmaddress *k);
1621struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1622struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1623 struct xfrm_migrate *m);
1624int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1625 struct xfrm_migrate *m, int num_bundles,
1626 struct xfrm_kmaddress *k, struct net *net);
1627#endif
1628
1629int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1630void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1631int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1632 xfrm_address_t *addr);
1633
1634void xfrm_input_init(void);
1635int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1636
1637void xfrm_probe_algs(void);
1638int xfrm_count_pfkey_auth_supported(void);
1639int xfrm_count_pfkey_enc_supported(void);
1640struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1641struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1642struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1643struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1644struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1645struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1646struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1647struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1648struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1649 int probe);
1650
1651static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1652 const xfrm_address_t *b)
1653{
1654 return ipv6_addr_equal((const struct in6_addr *)a,
1655 (const struct in6_addr *)b);
1656}
1657
1658static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1659 const xfrm_address_t *b,
1660 sa_family_t family)
1661{
1662 switch (family) {
1663 default:
1664 case AF_INET:
1665 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1666 case AF_INET6:
1667 return xfrm6_addr_equal(a, b);
1668 }
1669}
1670
1671static inline int xfrm_policy_id2dir(u32 index)
1672{
1673 return index & 7;
1674}
1675
1676#ifdef CONFIG_XFRM
1677static inline int xfrm_aevent_is_on(struct net *net)
1678{
1679 struct sock *nlsk;
1680 int ret = 0;
1681
1682 rcu_read_lock();
1683 nlsk = rcu_dereference(net->xfrm.nlsk);
1684 if (nlsk)
1685 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1686 rcu_read_unlock();
1687 return ret;
1688}
1689
1690static inline int xfrm_acquire_is_on(struct net *net)
1691{
1692 struct sock *nlsk;
1693 int ret = 0;
1694
1695 rcu_read_lock();
1696 nlsk = rcu_dereference(net->xfrm.nlsk);
1697 if (nlsk)
1698 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1699 rcu_read_unlock();
1700
1701 return ret;
1702}
1703#endif
1704
1705static inline int aead_len(struct xfrm_algo_aead *alg)
1706{
1707 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1708}
1709
1710static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1711{
1712 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1713}
1714
1715static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1716{
1717 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1718}
1719
1720static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1721{
1722 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1723}
1724
1725#ifdef CONFIG_XFRM_MIGRATE
1726static inline int xfrm_replay_clone(struct xfrm_state *x,
1727 struct xfrm_state *orig)
1728{
1729 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1730 GFP_KERNEL);
1731 if (!x->replay_esn)
1732 return -ENOMEM;
1733
1734 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1735 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1736
1737 x->preplay_esn = kmemdup(x->replay_esn,
1738 xfrm_replay_state_esn_len(x->replay_esn),
1739 GFP_KERNEL);
1740 if (!x->preplay_esn) {
1741 kfree(x->replay_esn);
1742 return -ENOMEM;
1743 }
1744
1745 return 0;
1746}
1747
1748static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1749{
1750 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1751}
1752
1753
1754static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1755{
1756 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1757}
1758
1759static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1760{
1761 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1762}
1763
1764static inline void xfrm_states_put(struct xfrm_state **states, int n)
1765{
1766 int i;
1767 for (i = 0; i < n; i++)
1768 xfrm_state_put(*(states + i));
1769}
1770
1771static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1772{
1773 int i;
1774 for (i = 0; i < n; i++)
1775 xfrm_state_delete(*(states + i));
1776}
1777#endif
1778
1779#ifdef CONFIG_XFRM
1780static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1781{
1782 return skb->sp->xvec[skb->sp->len - 1];
1783}
1784#endif
1785
1786static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1787{
1788 if (attrs[XFRMA_MARK])
1789 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1790 else
1791 m->v = m->m = 0;
1792
1793 return m->v & m->m;
1794}
1795
1796static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1797{
1798 int ret = 0;
1799
1800 if (m->m | m->v)
1801 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1802 return ret;
1803}
1804
1805static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1806 unsigned int family)
1807{
1808 bool tunnel = false;
1809
1810 switch(family) {
1811 case AF_INET:
1812 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1813 tunnel = true;
1814 break;
1815 case AF_INET6:
1816 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1817 tunnel = true;
1818 break;
1819 }
1820 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1821 return -EINVAL;
1822
1823 return 0;
1824}
1825#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 */