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