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