Loading...
1#ifndef _NET_XFRM_H
2#define _NET_XFRM_H
3
4#include <linux/compiler.h>
5#include <linux/xfrm.h>
6#include <linux/spinlock.h>
7#include <linux/list.h>
8#include <linux/skbuff.h>
9#include <linux/socket.h>
10#include <linux/pfkeyv2.h>
11#include <linux/ipsec.h>
12#include <linux/in6.h>
13#include <linux/mutex.h>
14#include <linux/audit.h>
15#include <linux/slab.h>
16
17#include <net/sock.h>
18#include <net/dst.h>
19#include <net/ip.h>
20#include <net/route.h>
21#include <net/ipv6.h>
22#include <net/ip6_fib.h>
23#include <net/flow.h>
24
25#include <linux/interrupt.h>
26
27#ifdef CONFIG_XFRM_STATISTICS
28#include <net/snmp.h>
29#endif
30
31#define XFRM_PROTO_ESP 50
32#define XFRM_PROTO_AH 51
33#define XFRM_PROTO_COMP 108
34#define XFRM_PROTO_IPIP 4
35#define XFRM_PROTO_IPV6 41
36#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41#define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46#ifdef CONFIG_XFRM_STATISTICS
47#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48#define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49#define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50#else
51#define XFRM_INC_STATS(net, field) ((void)(net))
52#define XFRM_INC_STATS_BH(net, field) ((void)(net))
53#define XFRM_INC_STATS_USER(net, field) ((void)(net))
54#endif
55
56extern struct mutex xfrm_cfg_mutex;
57
58/* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 union {
123 u8 dying;
124 u8 proto;
125 };
126 u32 seq;
127};
128
129/* Full description of state of transformer. */
130struct xfrm_state {
131#ifdef CONFIG_NET_NS
132 struct net *xs_net;
133#endif
134 union {
135 struct hlist_node gclist;
136 struct hlist_node bydst;
137 };
138 struct hlist_node bysrc;
139 struct hlist_node byspi;
140
141 atomic_t refcnt;
142 spinlock_t lock;
143
144 struct xfrm_id id;
145 struct xfrm_selector sel;
146 struct xfrm_mark mark;
147 u32 tfcpad;
148
149 u32 genid;
150
151 /* Key manager bits */
152 struct xfrm_state_walk km;
153
154 /* Parameters of this state. */
155 struct {
156 u32 reqid;
157 u8 mode;
158 u8 replay_window;
159 u8 aalgo, ealgo, calgo;
160 u8 flags;
161 u16 family;
162 xfrm_address_t saddr;
163 int header_len;
164 int trailer_len;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo_auth *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189 struct xfrm_replay_state_esn *replay_esn;
190
191 /* Replay detection state at the time we sent the last notification */
192 struct xfrm_replay_state preplay;
193 struct xfrm_replay_state_esn *preplay_esn;
194
195 /* The functions for replay detection. */
196 struct xfrm_replay *repl;
197
198 /* internal flag that only holds state for delayed aevent at the
199 * moment
200 */
201 u32 xflags;
202
203 /* Replay detection notification settings */
204 u32 replay_maxage;
205 u32 replay_maxdiff;
206
207 /* Replay detection notification timer */
208 struct timer_list rtimer;
209
210 /* Statistics */
211 struct xfrm_stats stats;
212
213 struct xfrm_lifetime_cur curlft;
214 struct tasklet_hrtimer mtimer;
215
216 /* Last used time */
217 unsigned long lastused;
218
219 /* Reference to data common to all the instances of this
220 * transformer. */
221 const struct xfrm_type *type;
222 struct xfrm_mode *inner_mode;
223 struct xfrm_mode *inner_mode_iaf;
224 struct xfrm_mode *outer_mode;
225
226 /* Security context */
227 struct xfrm_sec_ctx *security;
228
229 /* Private data of this transformer, format is opaque,
230 * interpreted by xfrm_type methods. */
231 void *data;
232};
233
234static inline struct net *xs_net(struct xfrm_state *x)
235{
236 return read_pnet(&x->xs_net);
237}
238
239/* xflags - make enum if more show up */
240#define XFRM_TIME_DEFER 1
241
242enum {
243 XFRM_STATE_VOID,
244 XFRM_STATE_ACQ,
245 XFRM_STATE_VALID,
246 XFRM_STATE_ERROR,
247 XFRM_STATE_EXPIRED,
248 XFRM_STATE_DEAD
249};
250
251/* callback structure passed from either netlink or pfkey */
252struct km_event {
253 union {
254 u32 hard;
255 u32 proto;
256 u32 byid;
257 u32 aevent;
258 u32 type;
259 } data;
260
261 u32 seq;
262 u32 pid;
263 u32 event;
264 struct net *net;
265};
266
267struct xfrm_replay {
268 void (*advance)(struct xfrm_state *x, __be32 net_seq);
269 int (*check)(struct xfrm_state *x,
270 struct sk_buff *skb,
271 __be32 net_seq);
272 void (*notify)(struct xfrm_state *x, int event);
273 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
274};
275
276struct net_device;
277struct xfrm_type;
278struct xfrm_dst;
279struct xfrm_policy_afinfo {
280 unsigned short family;
281 struct dst_ops *dst_ops;
282 void (*garbage_collect)(struct net *net);
283 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
284 const xfrm_address_t *saddr,
285 const xfrm_address_t *daddr);
286 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
287 void (*decode_session)(struct sk_buff *skb,
288 struct flowi *fl,
289 int reverse);
290 int (*get_tos)(const struct flowi *fl);
291 int (*init_path)(struct xfrm_dst *path,
292 struct dst_entry *dst,
293 int nfheader_len);
294 int (*fill_dst)(struct xfrm_dst *xdst,
295 struct net_device *dev,
296 const struct flowi *fl);
297 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
298};
299
300extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
301extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
302extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
303extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
304
305struct xfrm_tmpl;
306extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
307extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
308extern int __xfrm_state_delete(struct xfrm_state *x);
309
310struct xfrm_state_afinfo {
311 unsigned int family;
312 unsigned int proto;
313 __be16 eth_proto;
314 struct module *owner;
315 const struct xfrm_type *type_map[IPPROTO_MAX];
316 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
317 int (*init_flags)(struct xfrm_state *x);
318 void (*init_tempsel)(struct xfrm_selector *sel,
319 const struct flowi *fl);
320 void (*init_temprop)(struct xfrm_state *x,
321 const struct xfrm_tmpl *tmpl,
322 const xfrm_address_t *daddr,
323 const xfrm_address_t *saddr);
324 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
325 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
326 int (*output)(struct sk_buff *skb);
327 int (*output_finish)(struct sk_buff *skb);
328 int (*extract_input)(struct xfrm_state *x,
329 struct sk_buff *skb);
330 int (*extract_output)(struct xfrm_state *x,
331 struct sk_buff *skb);
332 int (*transport_finish)(struct sk_buff *skb,
333 int async);
334};
335
336extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
337extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
338
339extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
340
341struct xfrm_type {
342 char *description;
343 struct module *owner;
344 u8 proto;
345 u8 flags;
346#define XFRM_TYPE_NON_FRAGMENT 1
347#define XFRM_TYPE_REPLAY_PROT 2
348#define XFRM_TYPE_LOCAL_COADDR 4
349#define XFRM_TYPE_REMOTE_COADDR 8
350
351 int (*init_state)(struct xfrm_state *x);
352 void (*destructor)(struct xfrm_state *);
353 int (*input)(struct xfrm_state *, struct sk_buff *skb);
354 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
355 int (*reject)(struct xfrm_state *, struct sk_buff *,
356 const struct flowi *);
357 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
358 /* Estimate maximal size of result of transformation of a dgram */
359 u32 (*get_mtu)(struct xfrm_state *, int size);
360};
361
362extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
363extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
364
365struct xfrm_mode {
366 /*
367 * Remove encapsulation header.
368 *
369 * The IP header will be moved over the top of the encapsulation
370 * header.
371 *
372 * On entry, the transport header shall point to where the IP header
373 * should be and the network header shall be set to where the IP
374 * header currently is. skb->data shall point to the start of the
375 * payload.
376 */
377 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
378
379 /*
380 * This is the actual input entry point.
381 *
382 * For transport mode and equivalent this would be identical to
383 * input2 (which does not need to be set). While tunnel mode
384 * and equivalent would set this to the tunnel encapsulation function
385 * xfrm4_prepare_input that would in turn call input2.
386 */
387 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
388
389 /*
390 * Add encapsulation header.
391 *
392 * On exit, the transport header will be set to the start of the
393 * encapsulation header to be filled in by x->type->output and
394 * the mac header will be set to the nextheader (protocol for
395 * IPv4) field of the extension header directly preceding the
396 * encapsulation header, or in its absence, that of the top IP
397 * header. The value of the network header will always point
398 * to the top IP header while skb->data will point to the payload.
399 */
400 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
401
402 /*
403 * This is the actual output entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * output2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to a tunnel encapsulation function
408 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
409 * call output2.
410 */
411 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
412
413 struct xfrm_state_afinfo *afinfo;
414 struct module *owner;
415 unsigned int encap;
416 int flags;
417};
418
419/* Flags for xfrm_mode. */
420enum {
421 XFRM_MODE_FLAG_TUNNEL = 1,
422};
423
424extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
425extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
426
427static inline int xfrm_af2proto(unsigned int family)
428{
429 switch(family) {
430 case AF_INET:
431 return IPPROTO_IPIP;
432 case AF_INET6:
433 return IPPROTO_IPV6;
434 default:
435 return 0;
436 }
437}
438
439static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
440{
441 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
442 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
443 return x->inner_mode;
444 else
445 return x->inner_mode_iaf;
446}
447
448struct xfrm_tmpl {
449/* id in template is interpreted as:
450 * daddr - destination of tunnel, may be zero for transport mode.
451 * spi - zero to acquire spi. Not zero if spi is static, then
452 * daddr must be fixed too.
453 * proto - AH/ESP/IPCOMP
454 */
455 struct xfrm_id id;
456
457/* Source address of tunnel. Ignored, if it is not a tunnel. */
458 xfrm_address_t saddr;
459
460 unsigned short encap_family;
461
462 u32 reqid;
463
464/* Mode: transport, tunnel etc. */
465 u8 mode;
466
467/* Sharing mode: unique, this session only, this user only etc. */
468 u8 share;
469
470/* May skip this transfomration if no SA is found */
471 u8 optional;
472
473/* Skip aalgos/ealgos/calgos checks. */
474 u8 allalgs;
475
476/* Bit mask of algos allowed for acquisition */
477 u32 aalgos;
478 u32 ealgos;
479 u32 calgos;
480};
481
482#define XFRM_MAX_DEPTH 6
483
484struct xfrm_policy_walk_entry {
485 struct list_head all;
486 u8 dead;
487};
488
489struct xfrm_policy_walk {
490 struct xfrm_policy_walk_entry walk;
491 u8 type;
492 u32 seq;
493};
494
495struct xfrm_policy {
496#ifdef CONFIG_NET_NS
497 struct net *xp_net;
498#endif
499 struct hlist_node bydst;
500 struct hlist_node byidx;
501
502 /* This lock only affects elements except for entry. */
503 rwlock_t lock;
504 atomic_t refcnt;
505 struct timer_list timer;
506
507 struct flow_cache_object flo;
508 atomic_t genid;
509 u32 priority;
510 u32 index;
511 struct xfrm_mark mark;
512 struct xfrm_selector selector;
513 struct xfrm_lifetime_cfg lft;
514 struct xfrm_lifetime_cur curlft;
515 struct xfrm_policy_walk_entry walk;
516 u8 type;
517 u8 action;
518 u8 flags;
519 u8 xfrm_nr;
520 u16 family;
521 struct xfrm_sec_ctx *security;
522 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
523};
524
525static inline struct net *xp_net(const struct xfrm_policy *xp)
526{
527 return read_pnet(&xp->xp_net);
528}
529
530struct xfrm_kmaddress {
531 xfrm_address_t local;
532 xfrm_address_t remote;
533 u32 reserved;
534 u16 family;
535};
536
537struct xfrm_migrate {
538 xfrm_address_t old_daddr;
539 xfrm_address_t old_saddr;
540 xfrm_address_t new_daddr;
541 xfrm_address_t new_saddr;
542 u8 proto;
543 u8 mode;
544 u16 reserved;
545 u32 reqid;
546 u16 old_family;
547 u16 new_family;
548};
549
550#define XFRM_KM_TIMEOUT 30
551/* which seqno */
552#define XFRM_REPLAY_SEQ 1
553#define XFRM_REPLAY_OSEQ 2
554#define XFRM_REPLAY_SEQ_MASK 3
555/* what happened */
556#define XFRM_REPLAY_UPDATE XFRM_AE_CR
557#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
558
559/* default aevent timeout in units of 100ms */
560#define XFRM_AE_ETIME 10
561/* Async Event timer multiplier */
562#define XFRM_AE_ETH_M 10
563/* default seq threshold size */
564#define XFRM_AE_SEQT_SIZE 2
565
566struct xfrm_mgr {
567 struct list_head list;
568 char *id;
569 int (*notify)(struct xfrm_state *x, const struct km_event *c);
570 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
571 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
572 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
573 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
574 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
575 int (*migrate)(const struct xfrm_selector *sel,
576 u8 dir, u8 type,
577 const struct xfrm_migrate *m,
578 int num_bundles,
579 const struct xfrm_kmaddress *k);
580};
581
582extern int xfrm_register_km(struct xfrm_mgr *km);
583extern int xfrm_unregister_km(struct xfrm_mgr *km);
584
585/*
586 * This structure is used for the duration where packets are being
587 * transformed by IPsec. As soon as the packet leaves IPsec the
588 * area beyond the generic IP part may be overwritten.
589 */
590struct xfrm_skb_cb {
591 union {
592 struct inet_skb_parm h4;
593 struct inet6_skb_parm h6;
594 } header;
595
596 /* Sequence number for replay protection. */
597 union {
598 struct {
599 __u32 low;
600 __u32 hi;
601 } output;
602 struct {
603 __be32 low;
604 __be32 hi;
605 } input;
606 } seq;
607};
608
609#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
610
611/*
612 * This structure is used by the afinfo prepare_input/prepare_output functions
613 * to transmit header information to the mode input/output functions.
614 */
615struct xfrm_mode_skb_cb {
616 union {
617 struct inet_skb_parm h4;
618 struct inet6_skb_parm h6;
619 } header;
620
621 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
622 __be16 id;
623 __be16 frag_off;
624
625 /* IP header length (excluding options or extension headers). */
626 u8 ihl;
627
628 /* TOS for IPv4, class for IPv6. */
629 u8 tos;
630
631 /* TTL for IPv4, hop limitfor IPv6. */
632 u8 ttl;
633
634 /* Protocol for IPv4, NH for IPv6. */
635 u8 protocol;
636
637 /* Option length for IPv4, zero for IPv6. */
638 u8 optlen;
639
640 /* Used by IPv6 only, zero for IPv4. */
641 u8 flow_lbl[3];
642};
643
644#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
645
646/*
647 * This structure is used by the input processing to locate the SPI and
648 * related information.
649 */
650struct xfrm_spi_skb_cb {
651 union {
652 struct inet_skb_parm h4;
653 struct inet6_skb_parm h6;
654 } header;
655
656 unsigned int daddroff;
657 unsigned int family;
658};
659
660#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
661
662/* Audit Information */
663struct xfrm_audit {
664 u32 secid;
665 uid_t loginuid;
666 u32 sessionid;
667};
668
669#ifdef CONFIG_AUDITSYSCALL
670static inline struct audit_buffer *xfrm_audit_start(const char *op)
671{
672 struct audit_buffer *audit_buf = NULL;
673
674 if (audit_enabled == 0)
675 return NULL;
676 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
677 AUDIT_MAC_IPSEC_EVENT);
678 if (audit_buf == NULL)
679 return NULL;
680 audit_log_format(audit_buf, "op=%s", op);
681 return audit_buf;
682}
683
684static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
685 struct audit_buffer *audit_buf)
686{
687 char *secctx;
688 u32 secctx_len;
689
690 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
691 if (secid != 0 &&
692 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
693 audit_log_format(audit_buf, " subj=%s", secctx);
694 security_release_secctx(secctx, secctx_len);
695 } else
696 audit_log_task_context(audit_buf);
697}
698
699extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
700 u32 auid, u32 ses, u32 secid);
701extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
702 u32 auid, u32 ses, u32 secid);
703extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
704 u32 auid, u32 ses, u32 secid);
705extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
706 u32 auid, u32 ses, u32 secid);
707extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
708 struct sk_buff *skb);
709extern void xfrm_audit_state_replay(struct xfrm_state *x,
710 struct sk_buff *skb, __be32 net_seq);
711extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
712extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
713 __be32 net_spi, __be32 net_seq);
714extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
715 struct sk_buff *skb, u8 proto);
716#else
717
718static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
719 u32 auid, u32 ses, u32 secid)
720{
721}
722
723static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
724 u32 auid, u32 ses, u32 secid)
725{
726}
727
728static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
729 u32 auid, u32 ses, u32 secid)
730{
731}
732
733static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
734 u32 auid, u32 ses, u32 secid)
735{
736}
737
738static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
739 struct sk_buff *skb)
740{
741}
742
743static inline void xfrm_audit_state_replay(struct xfrm_state *x,
744 struct sk_buff *skb, __be32 net_seq)
745{
746}
747
748static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
749 u16 family)
750{
751}
752
753static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
754 __be32 net_spi, __be32 net_seq)
755{
756}
757
758static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
759 struct sk_buff *skb, u8 proto)
760{
761}
762#endif /* CONFIG_AUDITSYSCALL */
763
764static inline void xfrm_pol_hold(struct xfrm_policy *policy)
765{
766 if (likely(policy != NULL))
767 atomic_inc(&policy->refcnt);
768}
769
770extern void xfrm_policy_destroy(struct xfrm_policy *policy);
771
772static inline void xfrm_pol_put(struct xfrm_policy *policy)
773{
774 if (atomic_dec_and_test(&policy->refcnt))
775 xfrm_policy_destroy(policy);
776}
777
778static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
779{
780 int i;
781 for (i = npols - 1; i >= 0; --i)
782 xfrm_pol_put(pols[i]);
783}
784
785extern void __xfrm_state_destroy(struct xfrm_state *);
786
787static inline void __xfrm_state_put(struct xfrm_state *x)
788{
789 atomic_dec(&x->refcnt);
790}
791
792static inline void xfrm_state_put(struct xfrm_state *x)
793{
794 if (atomic_dec_and_test(&x->refcnt))
795 __xfrm_state_destroy(x);
796}
797
798static inline void xfrm_state_hold(struct xfrm_state *x)
799{
800 atomic_inc(&x->refcnt);
801}
802
803static inline bool addr_match(const void *token1, const void *token2,
804 int prefixlen)
805{
806 const __be32 *a1 = token1;
807 const __be32 *a2 = token2;
808 int pdw;
809 int pbi;
810
811 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
812 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
813
814 if (pdw)
815 if (memcmp(a1, a2, pdw << 2))
816 return false;
817
818 if (pbi) {
819 __be32 mask;
820
821 mask = htonl((0xffffffff) << (32 - pbi));
822
823 if ((a1[pdw] ^ a2[pdw]) & mask)
824 return false;
825 }
826
827 return true;
828}
829
830static __inline__
831__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
832{
833 __be16 port;
834 switch(fl->flowi_proto) {
835 case IPPROTO_TCP:
836 case IPPROTO_UDP:
837 case IPPROTO_UDPLITE:
838 case IPPROTO_SCTP:
839 port = uli->ports.sport;
840 break;
841 case IPPROTO_ICMP:
842 case IPPROTO_ICMPV6:
843 port = htons(uli->icmpt.type);
844 break;
845 case IPPROTO_MH:
846 port = htons(uli->mht.type);
847 break;
848 case IPPROTO_GRE:
849 port = htons(ntohl(uli->gre_key) >> 16);
850 break;
851 default:
852 port = 0; /*XXX*/
853 }
854 return port;
855}
856
857static __inline__
858__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
859{
860 __be16 port;
861 switch(fl->flowi_proto) {
862 case IPPROTO_TCP:
863 case IPPROTO_UDP:
864 case IPPROTO_UDPLITE:
865 case IPPROTO_SCTP:
866 port = uli->ports.dport;
867 break;
868 case IPPROTO_ICMP:
869 case IPPROTO_ICMPV6:
870 port = htons(uli->icmpt.code);
871 break;
872 case IPPROTO_GRE:
873 port = htons(ntohl(uli->gre_key) & 0xffff);
874 break;
875 default:
876 port = 0; /*XXX*/
877 }
878 return port;
879}
880
881extern int xfrm_selector_match(const struct xfrm_selector *sel,
882 const struct flowi *fl,
883 unsigned short family);
884
885#ifdef CONFIG_SECURITY_NETWORK_XFRM
886/* If neither has a context --> match
887 * Otherwise, both must have a context and the sids, doi, alg must match
888 */
889static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
890{
891 return ((!s1 && !s2) ||
892 (s1 && s2 &&
893 (s1->ctx_sid == s2->ctx_sid) &&
894 (s1->ctx_doi == s2->ctx_doi) &&
895 (s1->ctx_alg == s2->ctx_alg)));
896}
897#else
898static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
899{
900 return 1;
901}
902#endif
903
904/* A struct encoding bundle of transformations to apply to some set of flow.
905 *
906 * dst->child points to the next element of bundle.
907 * dst->xfrm points to an instanse of transformer.
908 *
909 * Due to unfortunate limitations of current routing cache, which we
910 * have no time to fix, it mirrors struct rtable and bound to the same
911 * routing key, including saddr,daddr. However, we can have many of
912 * bundles differing by session id. All the bundles grow from a parent
913 * policy rule.
914 */
915struct xfrm_dst {
916 union {
917 struct dst_entry dst;
918 struct rtable rt;
919 struct rt6_info rt6;
920 } u;
921 struct dst_entry *route;
922 struct flow_cache_object flo;
923 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
924 int num_pols, num_xfrms;
925#ifdef CONFIG_XFRM_SUB_POLICY
926 struct flowi *origin;
927 struct xfrm_selector *partner;
928#endif
929 u32 xfrm_genid;
930 u32 policy_genid;
931 u32 route_mtu_cached;
932 u32 child_mtu_cached;
933 u32 route_cookie;
934 u32 path_cookie;
935};
936
937#ifdef CONFIG_XFRM
938static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
939{
940 xfrm_pols_put(xdst->pols, xdst->num_pols);
941 dst_release(xdst->route);
942 if (likely(xdst->u.dst.xfrm))
943 xfrm_state_put(xdst->u.dst.xfrm);
944#ifdef CONFIG_XFRM_SUB_POLICY
945 kfree(xdst->origin);
946 xdst->origin = NULL;
947 kfree(xdst->partner);
948 xdst->partner = NULL;
949#endif
950}
951#endif
952
953extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
954
955struct sec_path {
956 atomic_t refcnt;
957 int len;
958 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
959};
960
961static inline int secpath_exists(struct sk_buff *skb)
962{
963#ifdef CONFIG_XFRM
964 return skb->sp != NULL;
965#else
966 return 0;
967#endif
968}
969
970static inline struct sec_path *
971secpath_get(struct sec_path *sp)
972{
973 if (sp)
974 atomic_inc(&sp->refcnt);
975 return sp;
976}
977
978extern void __secpath_destroy(struct sec_path *sp);
979
980static inline void
981secpath_put(struct sec_path *sp)
982{
983 if (sp && atomic_dec_and_test(&sp->refcnt))
984 __secpath_destroy(sp);
985}
986
987extern struct sec_path *secpath_dup(struct sec_path *src);
988
989static inline void
990secpath_reset(struct sk_buff *skb)
991{
992#ifdef CONFIG_XFRM
993 secpath_put(skb->sp);
994 skb->sp = NULL;
995#endif
996}
997
998static inline int
999xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1000{
1001 switch (family) {
1002 case AF_INET:
1003 return addr->a4 == 0;
1004 case AF_INET6:
1005 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1006 }
1007 return 0;
1008}
1009
1010static inline int
1011__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1012{
1013 return (tmpl->saddr.a4 &&
1014 tmpl->saddr.a4 != x->props.saddr.a4);
1015}
1016
1017static inline int
1018__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1019{
1020 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1021 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1022}
1023
1024static inline int
1025xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1026{
1027 switch (family) {
1028 case AF_INET:
1029 return __xfrm4_state_addr_cmp(tmpl, x);
1030 case AF_INET6:
1031 return __xfrm6_state_addr_cmp(tmpl, x);
1032 }
1033 return !0;
1034}
1035
1036#ifdef CONFIG_XFRM
1037extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1038
1039static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1040 struct sk_buff *skb,
1041 unsigned int family, int reverse)
1042{
1043 struct net *net = dev_net(skb->dev);
1044 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1045
1046 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1047 return __xfrm_policy_check(sk, ndir, skb, family);
1048
1049 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1050 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1051 __xfrm_policy_check(sk, ndir, skb, family);
1052}
1053
1054static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1055{
1056 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1057}
1058
1059static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1060{
1061 return xfrm_policy_check(sk, dir, skb, AF_INET);
1062}
1063
1064static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1065{
1066 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1067}
1068
1069static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1070 struct sk_buff *skb)
1071{
1072 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1073}
1074
1075static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1076 struct sk_buff *skb)
1077{
1078 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1079}
1080
1081extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1082 unsigned int family, int reverse);
1083
1084static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1085 unsigned int family)
1086{
1087 return __xfrm_decode_session(skb, fl, family, 0);
1088}
1089
1090static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1091 struct flowi *fl,
1092 unsigned int family)
1093{
1094 return __xfrm_decode_session(skb, fl, family, 1);
1095}
1096
1097extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1098
1099static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1100{
1101 struct net *net = dev_net(skb->dev);
1102
1103 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1104 (skb_dst(skb)->flags & DST_NOXFRM) ||
1105 __xfrm_route_forward(skb, family);
1106}
1107
1108static inline int xfrm4_route_forward(struct sk_buff *skb)
1109{
1110 return xfrm_route_forward(skb, AF_INET);
1111}
1112
1113static inline int xfrm6_route_forward(struct sk_buff *skb)
1114{
1115 return xfrm_route_forward(skb, AF_INET6);
1116}
1117
1118extern int __xfrm_sk_clone_policy(struct sock *sk);
1119
1120static inline int xfrm_sk_clone_policy(struct sock *sk)
1121{
1122 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1123 return __xfrm_sk_clone_policy(sk);
1124 return 0;
1125}
1126
1127extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1128
1129static inline void xfrm_sk_free_policy(struct sock *sk)
1130{
1131 if (unlikely(sk->sk_policy[0] != NULL)) {
1132 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1133 sk->sk_policy[0] = NULL;
1134 }
1135 if (unlikely(sk->sk_policy[1] != NULL)) {
1136 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1137 sk->sk_policy[1] = NULL;
1138 }
1139}
1140
1141#else
1142
1143static inline void xfrm_sk_free_policy(struct sock *sk) {}
1144static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1145static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1146static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1147static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1148{
1149 return 1;
1150}
1151static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1152{
1153 return 1;
1154}
1155static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1156{
1157 return 1;
1158}
1159static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1160 struct flowi *fl,
1161 unsigned int family)
1162{
1163 return -ENOSYS;
1164}
1165static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1166 struct sk_buff *skb)
1167{
1168 return 1;
1169}
1170static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1171 struct sk_buff *skb)
1172{
1173 return 1;
1174}
1175#endif
1176
1177static __inline__
1178xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1179{
1180 switch (family){
1181 case AF_INET:
1182 return (xfrm_address_t *)&fl->u.ip4.daddr;
1183 case AF_INET6:
1184 return (xfrm_address_t *)&fl->u.ip6.daddr;
1185 }
1186 return NULL;
1187}
1188
1189static __inline__
1190xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1191{
1192 switch (family){
1193 case AF_INET:
1194 return (xfrm_address_t *)&fl->u.ip4.saddr;
1195 case AF_INET6:
1196 return (xfrm_address_t *)&fl->u.ip6.saddr;
1197 }
1198 return NULL;
1199}
1200
1201static __inline__
1202void xfrm_flowi_addr_get(const struct flowi *fl,
1203 xfrm_address_t *saddr, xfrm_address_t *daddr,
1204 unsigned short family)
1205{
1206 switch(family) {
1207 case AF_INET:
1208 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1209 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1210 break;
1211 case AF_INET6:
1212 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->u.ip6.saddr);
1213 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->u.ip6.daddr);
1214 break;
1215 }
1216}
1217
1218static __inline__ int
1219__xfrm4_state_addr_check(const struct xfrm_state *x,
1220 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1221{
1222 if (daddr->a4 == x->id.daddr.a4 &&
1223 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1224 return 1;
1225 return 0;
1226}
1227
1228static __inline__ int
1229__xfrm6_state_addr_check(const struct xfrm_state *x,
1230 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1231{
1232 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1233 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1234 ipv6_addr_any((struct in6_addr *)saddr) ||
1235 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1236 return 1;
1237 return 0;
1238}
1239
1240static __inline__ int
1241xfrm_state_addr_check(const struct xfrm_state *x,
1242 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1243 unsigned short family)
1244{
1245 switch (family) {
1246 case AF_INET:
1247 return __xfrm4_state_addr_check(x, daddr, saddr);
1248 case AF_INET6:
1249 return __xfrm6_state_addr_check(x, daddr, saddr);
1250 }
1251 return 0;
1252}
1253
1254static __inline__ int
1255xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1256 unsigned short family)
1257{
1258 switch (family) {
1259 case AF_INET:
1260 return __xfrm4_state_addr_check(x,
1261 (const xfrm_address_t *)&fl->u.ip4.daddr,
1262 (const xfrm_address_t *)&fl->u.ip4.saddr);
1263 case AF_INET6:
1264 return __xfrm6_state_addr_check(x,
1265 (const xfrm_address_t *)&fl->u.ip6.daddr,
1266 (const xfrm_address_t *)&fl->u.ip6.saddr);
1267 }
1268 return 0;
1269}
1270
1271static inline int xfrm_state_kern(const struct xfrm_state *x)
1272{
1273 return atomic_read(&x->tunnel_users);
1274}
1275
1276static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1277{
1278 return (!userproto || proto == userproto ||
1279 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1280 proto == IPPROTO_ESP ||
1281 proto == IPPROTO_COMP)));
1282}
1283
1284/*
1285 * xfrm algorithm information
1286 */
1287struct xfrm_algo_aead_info {
1288 u16 icv_truncbits;
1289};
1290
1291struct xfrm_algo_auth_info {
1292 u16 icv_truncbits;
1293 u16 icv_fullbits;
1294};
1295
1296struct xfrm_algo_encr_info {
1297 u16 blockbits;
1298 u16 defkeybits;
1299};
1300
1301struct xfrm_algo_comp_info {
1302 u16 threshold;
1303};
1304
1305struct xfrm_algo_desc {
1306 char *name;
1307 char *compat;
1308 u8 available:1;
1309 union {
1310 struct xfrm_algo_aead_info aead;
1311 struct xfrm_algo_auth_info auth;
1312 struct xfrm_algo_encr_info encr;
1313 struct xfrm_algo_comp_info comp;
1314 } uinfo;
1315 struct sadb_alg desc;
1316};
1317
1318/* XFRM tunnel handlers. */
1319struct xfrm_tunnel {
1320 int (*handler)(struct sk_buff *skb);
1321 int (*err_handler)(struct sk_buff *skb, u32 info);
1322
1323 struct xfrm_tunnel __rcu *next;
1324 int priority;
1325};
1326
1327struct xfrm6_tunnel {
1328 int (*handler)(struct sk_buff *skb);
1329 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1330 u8 type, u8 code, int offset, __be32 info);
1331 struct xfrm6_tunnel __rcu *next;
1332 int priority;
1333};
1334
1335extern void xfrm_init(void);
1336extern void xfrm4_init(int rt_hash_size);
1337extern int xfrm_state_init(struct net *net);
1338extern void xfrm_state_fini(struct net *net);
1339extern void xfrm4_state_init(void);
1340#ifdef CONFIG_XFRM
1341extern int xfrm6_init(void);
1342extern void xfrm6_fini(void);
1343extern int xfrm6_state_init(void);
1344extern void xfrm6_state_fini(void);
1345#else
1346static inline int xfrm6_init(void)
1347{
1348 return 0;
1349}
1350static inline void xfrm6_fini(void)
1351{
1352 ;
1353}
1354#endif
1355
1356#ifdef CONFIG_XFRM_STATISTICS
1357extern int xfrm_proc_init(struct net *net);
1358extern void xfrm_proc_fini(struct net *net);
1359#endif
1360
1361extern int xfrm_sysctl_init(struct net *net);
1362#ifdef CONFIG_SYSCTL
1363extern void xfrm_sysctl_fini(struct net *net);
1364#else
1365static inline void xfrm_sysctl_fini(struct net *net)
1366{
1367}
1368#endif
1369
1370extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1371extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1372 int (*func)(struct xfrm_state *, int, void*), void *);
1373extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1374extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1375extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1376 const xfrm_address_t *saddr,
1377 const struct flowi *fl,
1378 struct xfrm_tmpl *tmpl,
1379 struct xfrm_policy *pol, int *err,
1380 unsigned short family);
1381extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1382 xfrm_address_t *daddr,
1383 xfrm_address_t *saddr,
1384 unsigned short family,
1385 u8 mode, u8 proto, u32 reqid);
1386extern int xfrm_state_check_expire(struct xfrm_state *x);
1387extern void xfrm_state_insert(struct xfrm_state *x);
1388extern int xfrm_state_add(struct xfrm_state *x);
1389extern int xfrm_state_update(struct xfrm_state *x);
1390extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1391 const xfrm_address_t *daddr, __be32 spi,
1392 u8 proto, unsigned short family);
1393extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1394 const xfrm_address_t *daddr,
1395 const xfrm_address_t *saddr,
1396 u8 proto,
1397 unsigned short family);
1398#ifdef CONFIG_XFRM_SUB_POLICY
1399extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1400 int n, unsigned short family);
1401extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1402 int n, unsigned short family);
1403#else
1404static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1405 int n, unsigned short family)
1406{
1407 return -ENOSYS;
1408}
1409
1410static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1411 int n, unsigned short family)
1412{
1413 return -ENOSYS;
1414}
1415#endif
1416
1417struct xfrmk_sadinfo {
1418 u32 sadhcnt; /* current hash bkts */
1419 u32 sadhmcnt; /* max allowed hash bkts */
1420 u32 sadcnt; /* current running count */
1421};
1422
1423struct xfrmk_spdinfo {
1424 u32 incnt;
1425 u32 outcnt;
1426 u32 fwdcnt;
1427 u32 inscnt;
1428 u32 outscnt;
1429 u32 fwdscnt;
1430 u32 spdhcnt;
1431 u32 spdhmcnt;
1432};
1433
1434extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1435 u32 seq);
1436extern int xfrm_state_delete(struct xfrm_state *x);
1437extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1438extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1439extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1440extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1441extern int xfrm_init_replay(struct xfrm_state *x);
1442extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1443extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1444extern int xfrm_init_state(struct xfrm_state *x);
1445extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1446extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1447 int encap_type);
1448extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1449extern int xfrm_output_resume(struct sk_buff *skb, int err);
1450extern int xfrm_output(struct sk_buff *skb);
1451extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1452extern int xfrm4_extract_header(struct sk_buff *skb);
1453extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1454extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1455 int encap_type);
1456extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1457extern int xfrm4_rcv(struct sk_buff *skb);
1458
1459static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1460{
1461 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1462}
1463
1464extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1465extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1466extern int xfrm4_output(struct sk_buff *skb);
1467extern int xfrm4_output_finish(struct sk_buff *skb);
1468extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1469extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1470extern int xfrm6_extract_header(struct sk_buff *skb);
1471extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1472extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1473extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1474extern int xfrm6_rcv(struct sk_buff *skb);
1475extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1476 xfrm_address_t *saddr, u8 proto);
1477extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1478extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1479extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1480extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1481extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1482extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1483extern int xfrm6_output(struct sk_buff *skb);
1484extern int xfrm6_output_finish(struct sk_buff *skb);
1485extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1486 u8 **prevhdr);
1487
1488#ifdef CONFIG_XFRM
1489extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1490extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1491#else
1492static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1493{
1494 return -ENOPROTOOPT;
1495}
1496
1497static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1498{
1499 /* should not happen */
1500 kfree_skb(skb);
1501 return 0;
1502}
1503#endif
1504
1505struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1506
1507extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1508extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1509 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1510extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1511int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1512struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1513 u8 type, int dir,
1514 struct xfrm_selector *sel,
1515 struct xfrm_sec_ctx *ctx, int delete,
1516 int *err);
1517struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1518int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1519u32 xfrm_get_acqseq(void);
1520extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1521struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1522 u8 mode, u32 reqid, u8 proto,
1523 const xfrm_address_t *daddr,
1524 const xfrm_address_t *saddr, int create,
1525 unsigned short family);
1526extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1527
1528#ifdef CONFIG_XFRM_MIGRATE
1529extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1530 const struct xfrm_migrate *m, int num_bundles,
1531 const struct xfrm_kmaddress *k);
1532extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1533extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1534 struct xfrm_migrate *m);
1535extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1536 struct xfrm_migrate *m, int num_bundles,
1537 struct xfrm_kmaddress *k);
1538#endif
1539
1540extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1541extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1542extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1543
1544extern void xfrm_input_init(void);
1545extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1546
1547extern void xfrm_probe_algs(void);
1548extern int xfrm_count_auth_supported(void);
1549extern int xfrm_count_enc_supported(void);
1550extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1551extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1552extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1553extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1554extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1555extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1556extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1557extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1558extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1559 int probe);
1560
1561struct hash_desc;
1562struct scatterlist;
1563typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1564 unsigned int);
1565
1566static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1567 const xfrm_address_t *b,
1568 int family)
1569{
1570 switch (family) {
1571 default:
1572 case AF_INET:
1573 return (__force u32)a->a4 - (__force u32)b->a4;
1574 case AF_INET6:
1575 return ipv6_addr_cmp((const struct in6_addr *)a,
1576 (const struct in6_addr *)b);
1577 }
1578}
1579
1580static inline int xfrm_policy_id2dir(u32 index)
1581{
1582 return index & 7;
1583}
1584
1585#ifdef CONFIG_XFRM
1586static inline int xfrm_aevent_is_on(struct net *net)
1587{
1588 struct sock *nlsk;
1589 int ret = 0;
1590
1591 rcu_read_lock();
1592 nlsk = rcu_dereference(net->xfrm.nlsk);
1593 if (nlsk)
1594 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1595 rcu_read_unlock();
1596 return ret;
1597}
1598#endif
1599
1600static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1601{
1602 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1603}
1604
1605static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1606{
1607 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1608}
1609
1610static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1611{
1612 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1613}
1614
1615#ifdef CONFIG_XFRM_MIGRATE
1616static inline int xfrm_replay_clone(struct xfrm_state *x,
1617 struct xfrm_state *orig)
1618{
1619 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1620 GFP_KERNEL);
1621 if (!x->replay_esn)
1622 return -ENOMEM;
1623
1624 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1625 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1626
1627 x->preplay_esn = kmemdup(x->replay_esn,
1628 xfrm_replay_state_esn_len(x->replay_esn),
1629 GFP_KERNEL);
1630 if (!x->preplay_esn) {
1631 kfree(x->replay_esn);
1632 return -ENOMEM;
1633 }
1634
1635 return 0;
1636}
1637
1638static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1639{
1640 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1641}
1642
1643static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1644{
1645 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1646}
1647
1648static inline void xfrm_states_put(struct xfrm_state **states, int n)
1649{
1650 int i;
1651 for (i = 0; i < n; i++)
1652 xfrm_state_put(*(states + i));
1653}
1654
1655static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1656{
1657 int i;
1658 for (i = 0; i < n; i++)
1659 xfrm_state_delete(*(states + i));
1660}
1661#endif
1662
1663#ifdef CONFIG_XFRM
1664static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1665{
1666 return skb->sp->xvec[skb->sp->len - 1];
1667}
1668#endif
1669
1670static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1671{
1672 if (attrs[XFRMA_MARK])
1673 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1674 else
1675 m->v = m->m = 0;
1676
1677 return m->v & m->m;
1678}
1679
1680static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1681{
1682 if (m->m | m->v)
1683 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1684 return 0;
1685
1686nla_put_failure:
1687 return -1;
1688}
1689
1690#endif /* _NET_XFRM_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_XFRM_H
3#define _NET_XFRM_H
4
5#include <linux/compiler.h>
6#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/pfkeyv2.h>
12#include <linux/ipsec.h>
13#include <linux/in6.h>
14#include <linux/mutex.h>
15#include <linux/audit.h>
16#include <linux/slab.h>
17#include <linux/refcount.h>
18#include <linux/sockptr.h>
19
20#include <net/sock.h>
21#include <net/dst.h>
22#include <net/ip.h>
23#include <net/route.h>
24#include <net/ipv6.h>
25#include <net/ip6_fib.h>
26#include <net/flow.h>
27#include <net/gro_cells.h>
28
29#include <linux/interrupt.h>
30
31#ifdef CONFIG_XFRM_STATISTICS
32#include <net/snmp.h>
33#endif
34
35#define XFRM_PROTO_ESP 50
36#define XFRM_PROTO_AH 51
37#define XFRM_PROTO_COMP 108
38#define XFRM_PROTO_IPIP 4
39#define XFRM_PROTO_IPV6 41
40#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
41#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
42
43#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
44#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
45#define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51
52#ifdef CONFIG_XFRM_STATISTICS
53#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54#define XFRM_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.xfrm_statistics, field, val)
55#else
56#define XFRM_INC_STATS(net, field) ((void)(net))
57#define XFRM_ADD_STATS(net, field, val) ((void)(net))
58#endif
59
60
61/* Organization of SPD aka "XFRM rules"
62 ------------------------------------
63
64 Basic objects:
65 - policy rule, struct xfrm_policy (=SPD entry)
66 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
67 - instance of a transformer, struct xfrm_state (=SA)
68 - template to clone xfrm_state, struct xfrm_tmpl
69
70 SPD is plain linear list of xfrm_policy rules, ordered by priority.
71 (To be compatible with existing pfkeyv2 implementations,
72 many rules with priority of 0x7fffffff are allowed to exist and
73 such rules are ordered in an unpredictable way, thanks to bsd folks.)
74
75 Lookup is plain linear search until the first match with selector.
76
77 If "action" is "block", then we prohibit the flow, otherwise:
78 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
79 policy entry has list of up to XFRM_MAX_DEPTH transformations,
80 described by templates xfrm_tmpl. Each template is resolved
81 to a complete xfrm_state (see below) and we pack bundle of transformations
82 to a dst_entry returned to requestor.
83
84 dst -. xfrm .-> xfrm_state #1
85 |---. child .-> dst -. xfrm .-> xfrm_state #2
86 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 |---. child .-> NULL
88
89 Bundles are cached at xrfm_policy struct (field ->bundles).
90
91
92 Resolution of xrfm_tmpl
93 -----------------------
94 Template contains:
95 1. ->mode Mode: transport or tunnel
96 2. ->id.proto Protocol: AH/ESP/IPCOMP
97 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
98 Q: allow to resolve security gateway?
99 4. ->id.spi If not zero, static SPI.
100 5. ->saddr Local tunnel endpoint, ignored for transport mode.
101 6. ->algos List of allowed algos. Plain bitmask now.
102 Q: ealgos, aalgos, calgos. What a mess...
103 7. ->share Sharing mode.
104 Q: how to implement private sharing mode? To add struct sock* to
105 flow id?
106
107 Having this template we search through SAD searching for entries
108 with appropriate mode/proto/algo, permitted by selector.
109 If no appropriate entry found, it is requested from key manager.
110
111 PROBLEMS:
112 Q: How to find all the bundles referring to a physical path for
113 PMTU discovery? Seems, dst should contain list of all parents...
114 and enter to infinite locking hierarchy disaster.
115 No! It is easier, we will not search for them, let them find us.
116 We add genid to each dst plus pointer to genid of raw IP route,
117 pmtu disc will update pmtu on raw IP route and increase its genid.
118 dst_check() will see this for top level and trigger resyncing
119 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 */
121
122struct xfrm_state_walk {
123 struct list_head all;
124 u8 state;
125 u8 dying;
126 u8 proto;
127 u32 seq;
128 struct xfrm_address_filter *filter;
129};
130
131enum {
132 XFRM_DEV_OFFLOAD_IN = 1,
133 XFRM_DEV_OFFLOAD_OUT,
134 XFRM_DEV_OFFLOAD_FWD,
135};
136
137enum {
138 XFRM_DEV_OFFLOAD_UNSPECIFIED,
139 XFRM_DEV_OFFLOAD_CRYPTO,
140 XFRM_DEV_OFFLOAD_PACKET,
141};
142
143enum {
144 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
145};
146
147struct xfrm_dev_offload {
148 struct net_device *dev;
149 netdevice_tracker dev_tracker;
150 struct net_device *real_dev;
151 unsigned long offload_handle;
152 u8 dir : 2;
153 u8 type : 2;
154 u8 flags : 2;
155};
156
157struct xfrm_mode {
158 u8 encap;
159 u8 family;
160 u8 flags;
161};
162
163/* Flags for xfrm_mode. */
164enum {
165 XFRM_MODE_FLAG_TUNNEL = 1,
166};
167
168enum xfrm_replay_mode {
169 XFRM_REPLAY_MODE_LEGACY,
170 XFRM_REPLAY_MODE_BMP,
171 XFRM_REPLAY_MODE_ESN,
172};
173
174/* Full description of state of transformer. */
175struct xfrm_state {
176 possible_net_t xs_net;
177 union {
178 struct hlist_node gclist;
179 struct hlist_node bydst;
180 };
181 struct hlist_node bysrc;
182 struct hlist_node byspi;
183 struct hlist_node byseq;
184
185 refcount_t refcnt;
186 spinlock_t lock;
187
188 struct xfrm_id id;
189 struct xfrm_selector sel;
190 struct xfrm_mark mark;
191 u32 if_id;
192 u32 tfcpad;
193
194 u32 genid;
195
196 /* Key manager bits */
197 struct xfrm_state_walk km;
198
199 /* Parameters of this state. */
200 struct {
201 u32 reqid;
202 u8 mode;
203 u8 replay_window;
204 u8 aalgo, ealgo, calgo;
205 u8 flags;
206 u16 family;
207 xfrm_address_t saddr;
208 int header_len;
209 int trailer_len;
210 u32 extra_flags;
211 struct xfrm_mark smark;
212 } props;
213
214 struct xfrm_lifetime_cfg lft;
215
216 /* Data for transformer */
217 struct xfrm_algo_auth *aalg;
218 struct xfrm_algo *ealg;
219 struct xfrm_algo *calg;
220 struct xfrm_algo_aead *aead;
221 const char *geniv;
222
223 /* mapping change rate limiting */
224 __be16 new_mapping_sport;
225 u32 new_mapping; /* seconds */
226 u32 mapping_maxage; /* seconds for input SA */
227
228 /* Data for encapsulator */
229 struct xfrm_encap_tmpl *encap;
230 struct sock __rcu *encap_sk;
231
232 /* Data for care-of address */
233 xfrm_address_t *coaddr;
234
235 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
236 struct xfrm_state *tunnel;
237
238 /* If a tunnel, number of users + 1 */
239 atomic_t tunnel_users;
240
241 /* State for replay detection */
242 struct xfrm_replay_state replay;
243 struct xfrm_replay_state_esn *replay_esn;
244
245 /* Replay detection state at the time we sent the last notification */
246 struct xfrm_replay_state preplay;
247 struct xfrm_replay_state_esn *preplay_esn;
248
249 /* replay detection mode */
250 enum xfrm_replay_mode repl_mode;
251 /* internal flag that only holds state for delayed aevent at the
252 * moment
253 */
254 u32 xflags;
255
256 /* Replay detection notification settings */
257 u32 replay_maxage;
258 u32 replay_maxdiff;
259
260 /* Replay detection notification timer */
261 struct timer_list rtimer;
262
263 /* Statistics */
264 struct xfrm_stats stats;
265
266 struct xfrm_lifetime_cur curlft;
267 struct hrtimer mtimer;
268
269 struct xfrm_dev_offload xso;
270
271 /* used to fix curlft->add_time when changing date */
272 long saved_tmo;
273
274 /* Last used time */
275 time64_t lastused;
276
277 struct page_frag xfrag;
278
279 /* Reference to data common to all the instances of this
280 * transformer. */
281 const struct xfrm_type *type;
282 struct xfrm_mode inner_mode;
283 struct xfrm_mode inner_mode_iaf;
284 struct xfrm_mode outer_mode;
285
286 const struct xfrm_type_offload *type_offload;
287
288 /* Security context */
289 struct xfrm_sec_ctx *security;
290
291 /* Private data of this transformer, format is opaque,
292 * interpreted by xfrm_type methods. */
293 void *data;
294};
295
296static inline struct net *xs_net(struct xfrm_state *x)
297{
298 return read_pnet(&x->xs_net);
299}
300
301/* xflags - make enum if more show up */
302#define XFRM_TIME_DEFER 1
303#define XFRM_SOFT_EXPIRE 2
304
305enum {
306 XFRM_STATE_VOID,
307 XFRM_STATE_ACQ,
308 XFRM_STATE_VALID,
309 XFRM_STATE_ERROR,
310 XFRM_STATE_EXPIRED,
311 XFRM_STATE_DEAD
312};
313
314/* callback structure passed from either netlink or pfkey */
315struct km_event {
316 union {
317 u32 hard;
318 u32 proto;
319 u32 byid;
320 u32 aevent;
321 u32 type;
322 } data;
323
324 u32 seq;
325 u32 portid;
326 u32 event;
327 struct net *net;
328};
329
330struct xfrm_if_decode_session_result {
331 struct net *net;
332 u32 if_id;
333};
334
335struct xfrm_if_cb {
336 bool (*decode_session)(struct sk_buff *skb,
337 unsigned short family,
338 struct xfrm_if_decode_session_result *res);
339};
340
341void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
342void xfrm_if_unregister_cb(void);
343
344struct net_device;
345struct xfrm_type;
346struct xfrm_dst;
347struct xfrm_policy_afinfo {
348 struct dst_ops *dst_ops;
349 struct dst_entry *(*dst_lookup)(struct net *net,
350 int tos, int oif,
351 const xfrm_address_t *saddr,
352 const xfrm_address_t *daddr,
353 u32 mark);
354 int (*get_saddr)(struct net *net, int oif,
355 xfrm_address_t *saddr,
356 xfrm_address_t *daddr,
357 u32 mark);
358 int (*fill_dst)(struct xfrm_dst *xdst,
359 struct net_device *dev,
360 const struct flowi *fl);
361 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
362};
363
364int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
365void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
366void km_policy_notify(struct xfrm_policy *xp, int dir,
367 const struct km_event *c);
368void km_state_notify(struct xfrm_state *x, const struct km_event *c);
369
370struct xfrm_tmpl;
371int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
372 struct xfrm_policy *pol);
373void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
374int __xfrm_state_delete(struct xfrm_state *x);
375
376struct xfrm_state_afinfo {
377 u8 family;
378 u8 proto;
379
380 const struct xfrm_type_offload *type_offload_esp;
381
382 const struct xfrm_type *type_esp;
383 const struct xfrm_type *type_ipip;
384 const struct xfrm_type *type_ipip6;
385 const struct xfrm_type *type_comp;
386 const struct xfrm_type *type_ah;
387 const struct xfrm_type *type_routing;
388 const struct xfrm_type *type_dstopts;
389
390 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
391 int (*transport_finish)(struct sk_buff *skb,
392 int async);
393 void (*local_error)(struct sk_buff *skb, u32 mtu);
394};
395
396int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
397int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
398struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
399struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
400
401struct xfrm_input_afinfo {
402 u8 family;
403 bool is_ipip;
404 int (*callback)(struct sk_buff *skb, u8 protocol,
405 int err);
406};
407
408int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
409int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
410
411void xfrm_flush_gc(void);
412void xfrm_state_delete_tunnel(struct xfrm_state *x);
413
414struct xfrm_type {
415 struct module *owner;
416 u8 proto;
417 u8 flags;
418#define XFRM_TYPE_NON_FRAGMENT 1
419#define XFRM_TYPE_REPLAY_PROT 2
420#define XFRM_TYPE_LOCAL_COADDR 4
421#define XFRM_TYPE_REMOTE_COADDR 8
422
423 int (*init_state)(struct xfrm_state *x,
424 struct netlink_ext_ack *extack);
425 void (*destructor)(struct xfrm_state *);
426 int (*input)(struct xfrm_state *, struct sk_buff *skb);
427 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
428 int (*reject)(struct xfrm_state *, struct sk_buff *,
429 const struct flowi *);
430};
431
432int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
433void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
434
435struct xfrm_type_offload {
436 struct module *owner;
437 u8 proto;
438 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
439 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
440 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
441};
442
443int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
444void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
445
446static inline int xfrm_af2proto(unsigned int family)
447{
448 switch(family) {
449 case AF_INET:
450 return IPPROTO_IPIP;
451 case AF_INET6:
452 return IPPROTO_IPV6;
453 default:
454 return 0;
455 }
456}
457
458static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
459{
460 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
461 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
462 return &x->inner_mode;
463 else
464 return &x->inner_mode_iaf;
465}
466
467struct xfrm_tmpl {
468/* id in template is interpreted as:
469 * daddr - destination of tunnel, may be zero for transport mode.
470 * spi - zero to acquire spi. Not zero if spi is static, then
471 * daddr must be fixed too.
472 * proto - AH/ESP/IPCOMP
473 */
474 struct xfrm_id id;
475
476/* Source address of tunnel. Ignored, if it is not a tunnel. */
477 xfrm_address_t saddr;
478
479 unsigned short encap_family;
480
481 u32 reqid;
482
483/* Mode: transport, tunnel etc. */
484 u8 mode;
485
486/* Sharing mode: unique, this session only, this user only etc. */
487 u8 share;
488
489/* May skip this transfomration if no SA is found */
490 u8 optional;
491
492/* Skip aalgos/ealgos/calgos checks. */
493 u8 allalgs;
494
495/* Bit mask of algos allowed for acquisition */
496 u32 aalgos;
497 u32 ealgos;
498 u32 calgos;
499};
500
501#define XFRM_MAX_DEPTH 6
502#define XFRM_MAX_OFFLOAD_DEPTH 1
503
504struct xfrm_policy_walk_entry {
505 struct list_head all;
506 u8 dead;
507};
508
509struct xfrm_policy_walk {
510 struct xfrm_policy_walk_entry walk;
511 u8 type;
512 u32 seq;
513};
514
515struct xfrm_policy_queue {
516 struct sk_buff_head hold_queue;
517 struct timer_list hold_timer;
518 unsigned long timeout;
519};
520
521struct xfrm_policy {
522 possible_net_t xp_net;
523 struct hlist_node bydst;
524 struct hlist_node byidx;
525
526 /* This lock only affects elements except for entry. */
527 rwlock_t lock;
528 refcount_t refcnt;
529 u32 pos;
530 struct timer_list timer;
531
532 atomic_t genid;
533 u32 priority;
534 u32 index;
535 u32 if_id;
536 struct xfrm_mark mark;
537 struct xfrm_selector selector;
538 struct xfrm_lifetime_cfg lft;
539 struct xfrm_lifetime_cur curlft;
540 struct xfrm_policy_walk_entry walk;
541 struct xfrm_policy_queue polq;
542 bool bydst_reinsert;
543 u8 type;
544 u8 action;
545 u8 flags;
546 u8 xfrm_nr;
547 u16 family;
548 struct xfrm_sec_ctx *security;
549 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
550 struct hlist_node bydst_inexact_list;
551 struct rcu_head rcu;
552
553 struct xfrm_dev_offload xdo;
554};
555
556static inline struct net *xp_net(const struct xfrm_policy *xp)
557{
558 return read_pnet(&xp->xp_net);
559}
560
561struct xfrm_kmaddress {
562 xfrm_address_t local;
563 xfrm_address_t remote;
564 u32 reserved;
565 u16 family;
566};
567
568struct xfrm_migrate {
569 xfrm_address_t old_daddr;
570 xfrm_address_t old_saddr;
571 xfrm_address_t new_daddr;
572 xfrm_address_t new_saddr;
573 u8 proto;
574 u8 mode;
575 u16 reserved;
576 u32 reqid;
577 u16 old_family;
578 u16 new_family;
579};
580
581#define XFRM_KM_TIMEOUT 30
582/* what happened */
583#define XFRM_REPLAY_UPDATE XFRM_AE_CR
584#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
585
586/* default aevent timeout in units of 100ms */
587#define XFRM_AE_ETIME 10
588/* Async Event timer multiplier */
589#define XFRM_AE_ETH_M 10
590/* default seq threshold size */
591#define XFRM_AE_SEQT_SIZE 2
592
593struct xfrm_mgr {
594 struct list_head list;
595 int (*notify)(struct xfrm_state *x, const struct km_event *c);
596 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
597 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
598 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
599 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
600 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
601 int (*migrate)(const struct xfrm_selector *sel,
602 u8 dir, u8 type,
603 const struct xfrm_migrate *m,
604 int num_bundles,
605 const struct xfrm_kmaddress *k,
606 const struct xfrm_encap_tmpl *encap);
607 bool (*is_alive)(const struct km_event *c);
608};
609
610void xfrm_register_km(struct xfrm_mgr *km);
611void xfrm_unregister_km(struct xfrm_mgr *km);
612
613struct xfrm_tunnel_skb_cb {
614 union {
615 struct inet_skb_parm h4;
616 struct inet6_skb_parm h6;
617 } header;
618
619 union {
620 struct ip_tunnel *ip4;
621 struct ip6_tnl *ip6;
622 } tunnel;
623};
624
625#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
626
627/*
628 * This structure is used for the duration where packets are being
629 * transformed by IPsec. As soon as the packet leaves IPsec the
630 * area beyond the generic IP part may be overwritten.
631 */
632struct xfrm_skb_cb {
633 struct xfrm_tunnel_skb_cb header;
634
635 /* Sequence number for replay protection. */
636 union {
637 struct {
638 __u32 low;
639 __u32 hi;
640 } output;
641 struct {
642 __be32 low;
643 __be32 hi;
644 } input;
645 } seq;
646};
647
648#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
649
650/*
651 * This structure is used by the afinfo prepare_input/prepare_output functions
652 * to transmit header information to the mode input/output functions.
653 */
654struct xfrm_mode_skb_cb {
655 struct xfrm_tunnel_skb_cb header;
656
657 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
658 __be16 id;
659 __be16 frag_off;
660
661 /* IP header length (excluding options or extension headers). */
662 u8 ihl;
663
664 /* TOS for IPv4, class for IPv6. */
665 u8 tos;
666
667 /* TTL for IPv4, hop limitfor IPv6. */
668 u8 ttl;
669
670 /* Protocol for IPv4, NH for IPv6. */
671 u8 protocol;
672
673 /* Option length for IPv4, zero for IPv6. */
674 u8 optlen;
675
676 /* Used by IPv6 only, zero for IPv4. */
677 u8 flow_lbl[3];
678};
679
680#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
681
682/*
683 * This structure is used by the input processing to locate the SPI and
684 * related information.
685 */
686struct xfrm_spi_skb_cb {
687 struct xfrm_tunnel_skb_cb header;
688
689 unsigned int daddroff;
690 unsigned int family;
691 __be32 seq;
692};
693
694#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
695
696#ifdef CONFIG_AUDITSYSCALL
697static inline struct audit_buffer *xfrm_audit_start(const char *op)
698{
699 struct audit_buffer *audit_buf = NULL;
700
701 if (audit_enabled == AUDIT_OFF)
702 return NULL;
703 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
704 AUDIT_MAC_IPSEC_EVENT);
705 if (audit_buf == NULL)
706 return NULL;
707 audit_log_format(audit_buf, "op=%s", op);
708 return audit_buf;
709}
710
711static inline void xfrm_audit_helper_usrinfo(bool task_valid,
712 struct audit_buffer *audit_buf)
713{
714 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
715 audit_get_loginuid(current) :
716 INVALID_UID);
717 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
718 AUDIT_SID_UNSET;
719
720 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
721 audit_log_task_context(audit_buf);
722}
723
724void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
725void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
726 bool task_valid);
727void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
728void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
729void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
730 struct sk_buff *skb);
731void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
732 __be32 net_seq);
733void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
734void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
735 __be32 net_seq);
736void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
737 u8 proto);
738#else
739
740static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
741 bool task_valid)
742{
743}
744
745static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
746 bool task_valid)
747{
748}
749
750static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
751 bool task_valid)
752{
753}
754
755static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
756 bool task_valid)
757{
758}
759
760static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
761 struct sk_buff *skb)
762{
763}
764
765static inline void xfrm_audit_state_replay(struct xfrm_state *x,
766 struct sk_buff *skb, __be32 net_seq)
767{
768}
769
770static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
771 u16 family)
772{
773}
774
775static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
776 __be32 net_spi, __be32 net_seq)
777{
778}
779
780static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
781 struct sk_buff *skb, u8 proto)
782{
783}
784#endif /* CONFIG_AUDITSYSCALL */
785
786static inline void xfrm_pol_hold(struct xfrm_policy *policy)
787{
788 if (likely(policy != NULL))
789 refcount_inc(&policy->refcnt);
790}
791
792void xfrm_policy_destroy(struct xfrm_policy *policy);
793
794static inline void xfrm_pol_put(struct xfrm_policy *policy)
795{
796 if (refcount_dec_and_test(&policy->refcnt))
797 xfrm_policy_destroy(policy);
798}
799
800static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
801{
802 int i;
803 for (i = npols - 1; i >= 0; --i)
804 xfrm_pol_put(pols[i]);
805}
806
807void __xfrm_state_destroy(struct xfrm_state *, bool);
808
809static inline void __xfrm_state_put(struct xfrm_state *x)
810{
811 refcount_dec(&x->refcnt);
812}
813
814static inline void xfrm_state_put(struct xfrm_state *x)
815{
816 if (refcount_dec_and_test(&x->refcnt))
817 __xfrm_state_destroy(x, false);
818}
819
820static inline void xfrm_state_put_sync(struct xfrm_state *x)
821{
822 if (refcount_dec_and_test(&x->refcnt))
823 __xfrm_state_destroy(x, true);
824}
825
826static inline void xfrm_state_hold(struct xfrm_state *x)
827{
828 refcount_inc(&x->refcnt);
829}
830
831static inline bool addr_match(const void *token1, const void *token2,
832 unsigned int prefixlen)
833{
834 const __be32 *a1 = token1;
835 const __be32 *a2 = token2;
836 unsigned int pdw;
837 unsigned int pbi;
838
839 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
840 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
841
842 if (pdw)
843 if (memcmp(a1, a2, pdw << 2))
844 return false;
845
846 if (pbi) {
847 __be32 mask;
848
849 mask = htonl((0xffffffff) << (32 - pbi));
850
851 if ((a1[pdw] ^ a2[pdw]) & mask)
852 return false;
853 }
854
855 return true;
856}
857
858static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
859{
860 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
861 if (sizeof(long) == 4 && prefixlen == 0)
862 return true;
863 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
864}
865
866static __inline__
867__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
868{
869 __be16 port;
870 switch(fl->flowi_proto) {
871 case IPPROTO_TCP:
872 case IPPROTO_UDP:
873 case IPPROTO_UDPLITE:
874 case IPPROTO_SCTP:
875 port = uli->ports.sport;
876 break;
877 case IPPROTO_ICMP:
878 case IPPROTO_ICMPV6:
879 port = htons(uli->icmpt.type);
880 break;
881 case IPPROTO_MH:
882 port = htons(uli->mht.type);
883 break;
884 case IPPROTO_GRE:
885 port = htons(ntohl(uli->gre_key) >> 16);
886 break;
887 default:
888 port = 0; /*XXX*/
889 }
890 return port;
891}
892
893static __inline__
894__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
895{
896 __be16 port;
897 switch(fl->flowi_proto) {
898 case IPPROTO_TCP:
899 case IPPROTO_UDP:
900 case IPPROTO_UDPLITE:
901 case IPPROTO_SCTP:
902 port = uli->ports.dport;
903 break;
904 case IPPROTO_ICMP:
905 case IPPROTO_ICMPV6:
906 port = htons(uli->icmpt.code);
907 break;
908 case IPPROTO_GRE:
909 port = htons(ntohl(uli->gre_key) & 0xffff);
910 break;
911 default:
912 port = 0; /*XXX*/
913 }
914 return port;
915}
916
917bool xfrm_selector_match(const struct xfrm_selector *sel,
918 const struct flowi *fl, unsigned short family);
919
920#ifdef CONFIG_SECURITY_NETWORK_XFRM
921/* If neither has a context --> match
922 * Otherwise, both must have a context and the sids, doi, alg must match
923 */
924static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
925{
926 return ((!s1 && !s2) ||
927 (s1 && s2 &&
928 (s1->ctx_sid == s2->ctx_sid) &&
929 (s1->ctx_doi == s2->ctx_doi) &&
930 (s1->ctx_alg == s2->ctx_alg)));
931}
932#else
933static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
934{
935 return true;
936}
937#endif
938
939/* A struct encoding bundle of transformations to apply to some set of flow.
940 *
941 * xdst->child points to the next element of bundle.
942 * dst->xfrm points to an instanse of transformer.
943 *
944 * Due to unfortunate limitations of current routing cache, which we
945 * have no time to fix, it mirrors struct rtable and bound to the same
946 * routing key, including saddr,daddr. However, we can have many of
947 * bundles differing by session id. All the bundles grow from a parent
948 * policy rule.
949 */
950struct xfrm_dst {
951 union {
952 struct dst_entry dst;
953 struct rtable rt;
954 struct rt6_info rt6;
955 } u;
956 struct dst_entry *route;
957 struct dst_entry *child;
958 struct dst_entry *path;
959 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
960 int num_pols, num_xfrms;
961 u32 xfrm_genid;
962 u32 policy_genid;
963 u32 route_mtu_cached;
964 u32 child_mtu_cached;
965 u32 route_cookie;
966 u32 path_cookie;
967};
968
969static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
970{
971#ifdef CONFIG_XFRM
972 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
973 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
974
975 return xdst->path;
976 }
977#endif
978 return (struct dst_entry *) dst;
979}
980
981static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
982{
983#ifdef CONFIG_XFRM
984 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
985 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
986 return xdst->child;
987 }
988#endif
989 return NULL;
990}
991
992#ifdef CONFIG_XFRM
993static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
994{
995 xdst->child = child;
996}
997
998static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
999{
1000 xfrm_pols_put(xdst->pols, xdst->num_pols);
1001 dst_release(xdst->route);
1002 if (likely(xdst->u.dst.xfrm))
1003 xfrm_state_put(xdst->u.dst.xfrm);
1004}
1005#endif
1006
1007void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1008
1009struct xfrm_if_parms {
1010 int link; /* ifindex of underlying L2 interface */
1011 u32 if_id; /* interface identifyer */
1012 bool collect_md;
1013};
1014
1015struct xfrm_if {
1016 struct xfrm_if __rcu *next; /* next interface in list */
1017 struct net_device *dev; /* virtual device associated with interface */
1018 struct net *net; /* netns for packet i/o */
1019 struct xfrm_if_parms p; /* interface parms */
1020
1021 struct gro_cells gro_cells;
1022};
1023
1024struct xfrm_offload {
1025 /* Output sequence number for replay protection on offloading. */
1026 struct {
1027 __u32 low;
1028 __u32 hi;
1029 } seq;
1030
1031 __u32 flags;
1032#define SA_DELETE_REQ 1
1033#define CRYPTO_DONE 2
1034#define CRYPTO_NEXT_DONE 4
1035#define CRYPTO_FALLBACK 8
1036#define XFRM_GSO_SEGMENT 16
1037#define XFRM_GRO 32
1038/* 64 is free */
1039#define XFRM_DEV_RESUME 128
1040#define XFRM_XMIT 256
1041
1042 __u32 status;
1043#define CRYPTO_SUCCESS 1
1044#define CRYPTO_GENERIC_ERROR 2
1045#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1046#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1047#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1048#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1049#define CRYPTO_INVALID_PACKET_SYNTAX 64
1050#define CRYPTO_INVALID_PROTOCOL 128
1051
1052 /* Used to keep whole l2 header for transport mode GRO */
1053 __u32 orig_mac_len;
1054
1055 __u8 proto;
1056 __u8 inner_ipproto;
1057};
1058
1059struct sec_path {
1060 int len;
1061 int olen;
1062 int verified_cnt;
1063
1064 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1065 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1066};
1067
1068struct sec_path *secpath_set(struct sk_buff *skb);
1069
1070static inline void
1071secpath_reset(struct sk_buff *skb)
1072{
1073#ifdef CONFIG_XFRM
1074 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1075#endif
1076}
1077
1078static inline int
1079xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1080{
1081 switch (family) {
1082 case AF_INET:
1083 return addr->a4 == 0;
1084 case AF_INET6:
1085 return ipv6_addr_any(&addr->in6);
1086 }
1087 return 0;
1088}
1089
1090static inline int
1091__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1092{
1093 return (tmpl->saddr.a4 &&
1094 tmpl->saddr.a4 != x->props.saddr.a4);
1095}
1096
1097static inline int
1098__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1099{
1100 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1101 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1102}
1103
1104static inline int
1105xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1106{
1107 switch (family) {
1108 case AF_INET:
1109 return __xfrm4_state_addr_cmp(tmpl, x);
1110 case AF_INET6:
1111 return __xfrm6_state_addr_cmp(tmpl, x);
1112 }
1113 return !0;
1114}
1115
1116#ifdef CONFIG_XFRM
1117static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1118{
1119 struct sec_path *sp = skb_sec_path(skb);
1120
1121 return sp->xvec[sp->len - 1];
1122}
1123#endif
1124
1125static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1126{
1127#ifdef CONFIG_XFRM
1128 struct sec_path *sp = skb_sec_path(skb);
1129
1130 if (!sp || !sp->olen || sp->len != sp->olen)
1131 return NULL;
1132
1133 return &sp->ovec[sp->olen - 1];
1134#else
1135 return NULL;
1136#endif
1137}
1138
1139#ifdef CONFIG_XFRM
1140int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1141 unsigned short family);
1142
1143static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1144 int dir)
1145{
1146 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1147 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1148
1149 return false;
1150}
1151
1152static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1153 int dir, unsigned short family)
1154{
1155 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1156 /* same dst may be used for traffic originating from
1157 * devices with different policy settings.
1158 */
1159 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1160 }
1161 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1162}
1163
1164static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1165 struct sk_buff *skb,
1166 unsigned int family, int reverse)
1167{
1168 struct net *net = dev_net(skb->dev);
1169 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1170 struct xfrm_offload *xo = xfrm_offload(skb);
1171 struct xfrm_state *x;
1172
1173 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1174 return __xfrm_policy_check(sk, ndir, skb, family);
1175
1176 if (xo) {
1177 x = xfrm_input_state(skb);
1178 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1179 return (xo->flags & CRYPTO_DONE) &&
1180 (xo->status & CRYPTO_SUCCESS);
1181 }
1182
1183 return __xfrm_check_nopolicy(net, skb, dir) ||
1184 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1185 __xfrm_policy_check(sk, ndir, skb, family);
1186}
1187
1188static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1189{
1190 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1191}
1192
1193static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1194{
1195 return xfrm_policy_check(sk, dir, skb, AF_INET);
1196}
1197
1198static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1199{
1200 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1201}
1202
1203static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1204 struct sk_buff *skb)
1205{
1206 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1207}
1208
1209static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1210 struct sk_buff *skb)
1211{
1212 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1213}
1214
1215int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1216 unsigned int family, int reverse);
1217
1218static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1219 unsigned int family)
1220{
1221 return __xfrm_decode_session(net, skb, fl, family, 0);
1222}
1223
1224static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1225 struct flowi *fl,
1226 unsigned int family)
1227{
1228 return __xfrm_decode_session(net, skb, fl, family, 1);
1229}
1230
1231int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1232
1233static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1234{
1235 struct net *net = dev_net(skb->dev);
1236
1237 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1238 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1239 return true;
1240
1241 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1242 __xfrm_route_forward(skb, family);
1243}
1244
1245static inline int xfrm4_route_forward(struct sk_buff *skb)
1246{
1247 return xfrm_route_forward(skb, AF_INET);
1248}
1249
1250static inline int xfrm6_route_forward(struct sk_buff *skb)
1251{
1252 return xfrm_route_forward(skb, AF_INET6);
1253}
1254
1255int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1256
1257static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1258{
1259 if (!sk_fullsock(osk))
1260 return 0;
1261 sk->sk_policy[0] = NULL;
1262 sk->sk_policy[1] = NULL;
1263 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1264 return __xfrm_sk_clone_policy(sk, osk);
1265 return 0;
1266}
1267
1268int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1269
1270static inline void xfrm_sk_free_policy(struct sock *sk)
1271{
1272 struct xfrm_policy *pol;
1273
1274 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1275 if (unlikely(pol != NULL)) {
1276 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1277 sk->sk_policy[0] = NULL;
1278 }
1279 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1280 if (unlikely(pol != NULL)) {
1281 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1282 sk->sk_policy[1] = NULL;
1283 }
1284}
1285
1286#else
1287
1288static inline void xfrm_sk_free_policy(struct sock *sk) {}
1289static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1290static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1291static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1292static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1293{
1294 return 1;
1295}
1296static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1297{
1298 return 1;
1299}
1300static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1301{
1302 return 1;
1303}
1304static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1305 struct flowi *fl,
1306 unsigned int family)
1307{
1308 return -ENOSYS;
1309}
1310static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1311 struct sk_buff *skb)
1312{
1313 return 1;
1314}
1315static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1316 struct sk_buff *skb)
1317{
1318 return 1;
1319}
1320#endif
1321
1322static __inline__
1323xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1324{
1325 switch (family){
1326 case AF_INET:
1327 return (xfrm_address_t *)&fl->u.ip4.daddr;
1328 case AF_INET6:
1329 return (xfrm_address_t *)&fl->u.ip6.daddr;
1330 }
1331 return NULL;
1332}
1333
1334static __inline__
1335xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1336{
1337 switch (family){
1338 case AF_INET:
1339 return (xfrm_address_t *)&fl->u.ip4.saddr;
1340 case AF_INET6:
1341 return (xfrm_address_t *)&fl->u.ip6.saddr;
1342 }
1343 return NULL;
1344}
1345
1346static __inline__
1347void xfrm_flowi_addr_get(const struct flowi *fl,
1348 xfrm_address_t *saddr, xfrm_address_t *daddr,
1349 unsigned short family)
1350{
1351 switch(family) {
1352 case AF_INET:
1353 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1354 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1355 break;
1356 case AF_INET6:
1357 saddr->in6 = fl->u.ip6.saddr;
1358 daddr->in6 = fl->u.ip6.daddr;
1359 break;
1360 }
1361}
1362
1363static __inline__ int
1364__xfrm4_state_addr_check(const struct xfrm_state *x,
1365 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1366{
1367 if (daddr->a4 == x->id.daddr.a4 &&
1368 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1369 return 1;
1370 return 0;
1371}
1372
1373static __inline__ int
1374__xfrm6_state_addr_check(const struct xfrm_state *x,
1375 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1376{
1377 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1378 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1379 ipv6_addr_any((struct in6_addr *)saddr) ||
1380 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1381 return 1;
1382 return 0;
1383}
1384
1385static __inline__ int
1386xfrm_state_addr_check(const struct xfrm_state *x,
1387 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1388 unsigned short family)
1389{
1390 switch (family) {
1391 case AF_INET:
1392 return __xfrm4_state_addr_check(x, daddr, saddr);
1393 case AF_INET6:
1394 return __xfrm6_state_addr_check(x, daddr, saddr);
1395 }
1396 return 0;
1397}
1398
1399static __inline__ int
1400xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1401 unsigned short family)
1402{
1403 switch (family) {
1404 case AF_INET:
1405 return __xfrm4_state_addr_check(x,
1406 (const xfrm_address_t *)&fl->u.ip4.daddr,
1407 (const xfrm_address_t *)&fl->u.ip4.saddr);
1408 case AF_INET6:
1409 return __xfrm6_state_addr_check(x,
1410 (const xfrm_address_t *)&fl->u.ip6.daddr,
1411 (const xfrm_address_t *)&fl->u.ip6.saddr);
1412 }
1413 return 0;
1414}
1415
1416static inline int xfrm_state_kern(const struct xfrm_state *x)
1417{
1418 return atomic_read(&x->tunnel_users);
1419}
1420
1421static inline bool xfrm_id_proto_valid(u8 proto)
1422{
1423 switch (proto) {
1424 case IPPROTO_AH:
1425 case IPPROTO_ESP:
1426 case IPPROTO_COMP:
1427#if IS_ENABLED(CONFIG_IPV6)
1428 case IPPROTO_ROUTING:
1429 case IPPROTO_DSTOPTS:
1430#endif
1431 return true;
1432 default:
1433 return false;
1434 }
1435}
1436
1437/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1438static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1439{
1440 return (!userproto || proto == userproto ||
1441 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1442 proto == IPPROTO_ESP ||
1443 proto == IPPROTO_COMP)));
1444}
1445
1446/*
1447 * xfrm algorithm information
1448 */
1449struct xfrm_algo_aead_info {
1450 char *geniv;
1451 u16 icv_truncbits;
1452};
1453
1454struct xfrm_algo_auth_info {
1455 u16 icv_truncbits;
1456 u16 icv_fullbits;
1457};
1458
1459struct xfrm_algo_encr_info {
1460 char *geniv;
1461 u16 blockbits;
1462 u16 defkeybits;
1463};
1464
1465struct xfrm_algo_comp_info {
1466 u16 threshold;
1467};
1468
1469struct xfrm_algo_desc {
1470 char *name;
1471 char *compat;
1472 u8 available:1;
1473 u8 pfkey_supported:1;
1474 union {
1475 struct xfrm_algo_aead_info aead;
1476 struct xfrm_algo_auth_info auth;
1477 struct xfrm_algo_encr_info encr;
1478 struct xfrm_algo_comp_info comp;
1479 } uinfo;
1480 struct sadb_alg desc;
1481};
1482
1483/* XFRM protocol handlers. */
1484struct xfrm4_protocol {
1485 int (*handler)(struct sk_buff *skb);
1486 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1487 int encap_type);
1488 int (*cb_handler)(struct sk_buff *skb, int err);
1489 int (*err_handler)(struct sk_buff *skb, u32 info);
1490
1491 struct xfrm4_protocol __rcu *next;
1492 int priority;
1493};
1494
1495struct xfrm6_protocol {
1496 int (*handler)(struct sk_buff *skb);
1497 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1498 int encap_type);
1499 int (*cb_handler)(struct sk_buff *skb, int err);
1500 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1501 u8 type, u8 code, int offset, __be32 info);
1502
1503 struct xfrm6_protocol __rcu *next;
1504 int priority;
1505};
1506
1507/* XFRM tunnel handlers. */
1508struct xfrm_tunnel {
1509 int (*handler)(struct sk_buff *skb);
1510 int (*cb_handler)(struct sk_buff *skb, int err);
1511 int (*err_handler)(struct sk_buff *skb, u32 info);
1512
1513 struct xfrm_tunnel __rcu *next;
1514 int priority;
1515};
1516
1517struct xfrm6_tunnel {
1518 int (*handler)(struct sk_buff *skb);
1519 int (*cb_handler)(struct sk_buff *skb, int err);
1520 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1521 u8 type, u8 code, int offset, __be32 info);
1522 struct xfrm6_tunnel __rcu *next;
1523 int priority;
1524};
1525
1526void xfrm_init(void);
1527void xfrm4_init(void);
1528int xfrm_state_init(struct net *net);
1529void xfrm_state_fini(struct net *net);
1530void xfrm4_state_init(void);
1531void xfrm4_protocol_init(void);
1532#ifdef CONFIG_XFRM
1533int xfrm6_init(void);
1534void xfrm6_fini(void);
1535int xfrm6_state_init(void);
1536void xfrm6_state_fini(void);
1537int xfrm6_protocol_init(void);
1538void xfrm6_protocol_fini(void);
1539#else
1540static inline int xfrm6_init(void)
1541{
1542 return 0;
1543}
1544static inline void xfrm6_fini(void)
1545{
1546 ;
1547}
1548#endif
1549
1550#ifdef CONFIG_XFRM_STATISTICS
1551int xfrm_proc_init(struct net *net);
1552void xfrm_proc_fini(struct net *net);
1553#endif
1554
1555int xfrm_sysctl_init(struct net *net);
1556#ifdef CONFIG_SYSCTL
1557void xfrm_sysctl_fini(struct net *net);
1558#else
1559static inline void xfrm_sysctl_fini(struct net *net)
1560{
1561}
1562#endif
1563
1564void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1565 struct xfrm_address_filter *filter);
1566int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1567 int (*func)(struct xfrm_state *, int, void*), void *);
1568void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1569struct xfrm_state *xfrm_state_alloc(struct net *net);
1570void xfrm_state_free(struct xfrm_state *x);
1571struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1572 const xfrm_address_t *saddr,
1573 const struct flowi *fl,
1574 struct xfrm_tmpl *tmpl,
1575 struct xfrm_policy *pol, int *err,
1576 unsigned short family, u32 if_id);
1577struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1578 xfrm_address_t *daddr,
1579 xfrm_address_t *saddr,
1580 unsigned short family,
1581 u8 mode, u8 proto, u32 reqid);
1582struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1583 unsigned short family);
1584int xfrm_state_check_expire(struct xfrm_state *x);
1585void xfrm_state_update_stats(struct net *net);
1586#ifdef CONFIG_XFRM_OFFLOAD
1587static inline void xfrm_dev_state_update_stats(struct xfrm_state *x)
1588{
1589 struct xfrm_dev_offload *xdo = &x->xso;
1590 struct net_device *dev = xdo->dev;
1591
1592 if (dev && dev->xfrmdev_ops &&
1593 dev->xfrmdev_ops->xdo_dev_state_update_stats)
1594 dev->xfrmdev_ops->xdo_dev_state_update_stats(x);
1595
1596}
1597#else
1598static inline void xfrm_dev_state_update_stats(struct xfrm_state *x) {}
1599#endif
1600void xfrm_state_insert(struct xfrm_state *x);
1601int xfrm_state_add(struct xfrm_state *x);
1602int xfrm_state_update(struct xfrm_state *x);
1603struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1604 const xfrm_address_t *daddr, __be32 spi,
1605 u8 proto, unsigned short family);
1606struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1607 const xfrm_address_t *daddr,
1608 const xfrm_address_t *saddr,
1609 u8 proto,
1610 unsigned short family);
1611#ifdef CONFIG_XFRM_SUB_POLICY
1612void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1613 unsigned short family);
1614void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1615 unsigned short family);
1616#else
1617static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1618 int n, unsigned short family)
1619{
1620}
1621
1622static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1623 int n, unsigned short family)
1624{
1625}
1626#endif
1627
1628struct xfrmk_sadinfo {
1629 u32 sadhcnt; /* current hash bkts */
1630 u32 sadhmcnt; /* max allowed hash bkts */
1631 u32 sadcnt; /* current running count */
1632};
1633
1634struct xfrmk_spdinfo {
1635 u32 incnt;
1636 u32 outcnt;
1637 u32 fwdcnt;
1638 u32 inscnt;
1639 u32 outscnt;
1640 u32 fwdscnt;
1641 u32 spdhcnt;
1642 u32 spdhmcnt;
1643};
1644
1645struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1646int xfrm_state_delete(struct xfrm_state *x);
1647int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1648int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1649int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1650 bool task_valid);
1651void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1652void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1653u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1654int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1655u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1656int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1657 struct netlink_ext_ack *extack);
1658int xfrm_init_state(struct xfrm_state *x);
1659int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1660int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1661int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1662 int (*finish)(struct net *, struct sock *,
1663 struct sk_buff *));
1664int xfrm_trans_queue(struct sk_buff *skb,
1665 int (*finish)(struct net *, struct sock *,
1666 struct sk_buff *));
1667int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1668int xfrm_output(struct sock *sk, struct sk_buff *skb);
1669
1670#if IS_ENABLED(CONFIG_NET_PKTGEN)
1671int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1672#endif
1673
1674void xfrm_local_error(struct sk_buff *skb, int mtu);
1675int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1676 int encap_type);
1677int xfrm4_transport_finish(struct sk_buff *skb, int async);
1678int xfrm4_rcv(struct sk_buff *skb);
1679
1680static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1681{
1682 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1683 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1684 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1685 return xfrm_input(skb, nexthdr, spi, 0);
1686}
1687
1688int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1689int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1690int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1691int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1692int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1693void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1694int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1695 struct ip6_tnl *t);
1696int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1697 int encap_type);
1698int xfrm6_transport_finish(struct sk_buff *skb, int async);
1699int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1700int xfrm6_rcv(struct sk_buff *skb);
1701int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1702 xfrm_address_t *saddr, u8 proto);
1703void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1704int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1705int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1706int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1707int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1708__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1709__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1710int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1711
1712#ifdef CONFIG_XFRM
1713void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1714int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1715int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1716struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1717 struct sk_buff *skb);
1718struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1719 struct sk_buff *skb);
1720int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1721 int optlen);
1722#else
1723static inline int xfrm_user_policy(struct sock *sk, int optname,
1724 sockptr_t optval, int optlen)
1725{
1726 return -ENOPROTOOPT;
1727}
1728#endif
1729
1730struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1731 const xfrm_address_t *saddr,
1732 const xfrm_address_t *daddr,
1733 int family, u32 mark);
1734
1735struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1736
1737void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1738int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1739 int (*func)(struct xfrm_policy *, int, int, void*),
1740 void *);
1741void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1742int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1743struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1744 const struct xfrm_mark *mark,
1745 u32 if_id, u8 type, int dir,
1746 struct xfrm_selector *sel,
1747 struct xfrm_sec_ctx *ctx, int delete,
1748 int *err);
1749struct xfrm_policy *xfrm_policy_byid(struct net *net,
1750 const struct xfrm_mark *mark, u32 if_id,
1751 u8 type, int dir, u32 id, int delete,
1752 int *err);
1753int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1754void xfrm_policy_hash_rebuild(struct net *net);
1755u32 xfrm_get_acqseq(void);
1756int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1757int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1758 struct netlink_ext_ack *extack);
1759struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1760 u8 mode, u32 reqid, u32 if_id, u8 proto,
1761 const xfrm_address_t *daddr,
1762 const xfrm_address_t *saddr, int create,
1763 unsigned short family);
1764int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1765
1766#ifdef CONFIG_XFRM_MIGRATE
1767int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1768 const struct xfrm_migrate *m, int num_bundles,
1769 const struct xfrm_kmaddress *k,
1770 const struct xfrm_encap_tmpl *encap);
1771struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1772 u32 if_id);
1773struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1774 struct xfrm_migrate *m,
1775 struct xfrm_encap_tmpl *encap);
1776int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1777 struct xfrm_migrate *m, int num_bundles,
1778 struct xfrm_kmaddress *k, struct net *net,
1779 struct xfrm_encap_tmpl *encap, u32 if_id,
1780 struct netlink_ext_ack *extack);
1781#endif
1782
1783int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1784void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1785int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1786 xfrm_address_t *addr);
1787
1788void xfrm_input_init(void);
1789int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1790
1791void xfrm_probe_algs(void);
1792int xfrm_count_pfkey_auth_supported(void);
1793int xfrm_count_pfkey_enc_supported(void);
1794struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1795struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1796struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1797struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1798struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1799struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1800struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1801struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1802struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1803 int probe);
1804
1805static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1806 const xfrm_address_t *b)
1807{
1808 return ipv6_addr_equal((const struct in6_addr *)a,
1809 (const struct in6_addr *)b);
1810}
1811
1812static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1813 const xfrm_address_t *b,
1814 sa_family_t family)
1815{
1816 switch (family) {
1817 default:
1818 case AF_INET:
1819 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1820 case AF_INET6:
1821 return xfrm6_addr_equal(a, b);
1822 }
1823}
1824
1825static inline int xfrm_policy_id2dir(u32 index)
1826{
1827 return index & 7;
1828}
1829
1830#ifdef CONFIG_XFRM
1831void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1832int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1833void xfrm_replay_notify(struct xfrm_state *x, int event);
1834int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1835int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1836
1837static inline int xfrm_aevent_is_on(struct net *net)
1838{
1839 struct sock *nlsk;
1840 int ret = 0;
1841
1842 rcu_read_lock();
1843 nlsk = rcu_dereference(net->xfrm.nlsk);
1844 if (nlsk)
1845 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1846 rcu_read_unlock();
1847 return ret;
1848}
1849
1850static inline int xfrm_acquire_is_on(struct net *net)
1851{
1852 struct sock *nlsk;
1853 int ret = 0;
1854
1855 rcu_read_lock();
1856 nlsk = rcu_dereference(net->xfrm.nlsk);
1857 if (nlsk)
1858 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1859 rcu_read_unlock();
1860
1861 return ret;
1862}
1863#endif
1864
1865static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1866{
1867 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1868}
1869
1870static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1871{
1872 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1873}
1874
1875static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1876{
1877 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1878}
1879
1880static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1881{
1882 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1883}
1884
1885#ifdef CONFIG_XFRM_MIGRATE
1886static inline int xfrm_replay_clone(struct xfrm_state *x,
1887 struct xfrm_state *orig)
1888{
1889
1890 x->replay_esn = kmemdup(orig->replay_esn,
1891 xfrm_replay_state_esn_len(orig->replay_esn),
1892 GFP_KERNEL);
1893 if (!x->replay_esn)
1894 return -ENOMEM;
1895 x->preplay_esn = kmemdup(orig->preplay_esn,
1896 xfrm_replay_state_esn_len(orig->preplay_esn),
1897 GFP_KERNEL);
1898 if (!x->preplay_esn)
1899 return -ENOMEM;
1900
1901 return 0;
1902}
1903
1904static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1905{
1906 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1907}
1908
1909
1910static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1911{
1912 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1913}
1914
1915static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1916{
1917 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1918}
1919
1920static inline void xfrm_states_put(struct xfrm_state **states, int n)
1921{
1922 int i;
1923 for (i = 0; i < n; i++)
1924 xfrm_state_put(*(states + i));
1925}
1926
1927static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1928{
1929 int i;
1930 for (i = 0; i < n; i++)
1931 xfrm_state_delete(*(states + i));
1932}
1933#endif
1934
1935void __init xfrm_dev_init(void);
1936
1937#ifdef CONFIG_XFRM_OFFLOAD
1938void xfrm_dev_resume(struct sk_buff *skb);
1939void xfrm_dev_backlog(struct softnet_data *sd);
1940struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1941int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1942 struct xfrm_user_offload *xuo,
1943 struct netlink_ext_ack *extack);
1944int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1945 struct xfrm_user_offload *xuo, u8 dir,
1946 struct netlink_ext_ack *extack);
1947bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1948
1949static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1950{
1951 struct xfrm_dev_offload *xso = &x->xso;
1952
1953 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1954 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1955}
1956
1957static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1958{
1959 struct xfrm_state *x = dst->xfrm;
1960 struct xfrm_dst *xdst;
1961
1962 if (!x || !x->type_offload)
1963 return false;
1964
1965 xdst = (struct xfrm_dst *) dst;
1966 if (!x->xso.offload_handle && !xdst->child->xfrm)
1967 return true;
1968 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1969 !xdst->child->xfrm)
1970 return true;
1971
1972 return false;
1973}
1974
1975static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1976{
1977 struct xfrm_dev_offload *xso = &x->xso;
1978
1979 if (xso->dev)
1980 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1981}
1982
1983static inline void xfrm_dev_state_free(struct xfrm_state *x)
1984{
1985 struct xfrm_dev_offload *xso = &x->xso;
1986 struct net_device *dev = xso->dev;
1987
1988 if (dev && dev->xfrmdev_ops) {
1989 if (dev->xfrmdev_ops->xdo_dev_state_free)
1990 dev->xfrmdev_ops->xdo_dev_state_free(x);
1991 xso->dev = NULL;
1992 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1993 netdev_put(dev, &xso->dev_tracker);
1994 }
1995}
1996
1997static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1998{
1999 struct xfrm_dev_offload *xdo = &x->xdo;
2000 struct net_device *dev = xdo->dev;
2001
2002 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
2003 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
2004}
2005
2006static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2007{
2008 struct xfrm_dev_offload *xdo = &x->xdo;
2009 struct net_device *dev = xdo->dev;
2010
2011 if (dev && dev->xfrmdev_ops) {
2012 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2013 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2014 xdo->dev = NULL;
2015 netdev_put(dev, &xdo->dev_tracker);
2016 }
2017}
2018#else
2019static inline void xfrm_dev_resume(struct sk_buff *skb)
2020{
2021}
2022
2023static inline void xfrm_dev_backlog(struct softnet_data *sd)
2024{
2025}
2026
2027static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2028{
2029 return skb;
2030}
2031
2032static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2033{
2034 return 0;
2035}
2036
2037static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2038{
2039}
2040
2041static inline void xfrm_dev_state_free(struct xfrm_state *x)
2042{
2043}
2044
2045static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2046 struct xfrm_user_offload *xuo, u8 dir,
2047 struct netlink_ext_ack *extack)
2048{
2049 return 0;
2050}
2051
2052static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2053{
2054}
2055
2056static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2057{
2058}
2059
2060static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2061{
2062 return false;
2063}
2064
2065static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2066{
2067}
2068
2069static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2070{
2071 return false;
2072}
2073#endif
2074
2075static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2076{
2077 if (attrs[XFRMA_MARK])
2078 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2079 else
2080 m->v = m->m = 0;
2081
2082 return m->v & m->m;
2083}
2084
2085static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2086{
2087 int ret = 0;
2088
2089 if (m->m | m->v)
2090 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2091 return ret;
2092}
2093
2094static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2095{
2096 struct xfrm_mark *m = &x->props.smark;
2097
2098 return (m->v & m->m) | (mark & ~m->m);
2099}
2100
2101static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2102{
2103 int ret = 0;
2104
2105 if (if_id)
2106 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2107 return ret;
2108}
2109
2110static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2111 unsigned int family)
2112{
2113 bool tunnel = false;
2114
2115 switch(family) {
2116 case AF_INET:
2117 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2118 tunnel = true;
2119 break;
2120 case AF_INET6:
2121 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2122 tunnel = true;
2123 break;
2124 }
2125 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2126 return -EINVAL;
2127
2128 return 0;
2129}
2130
2131extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2132extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2133
2134struct xfrm_translator {
2135 /* Allocate frag_list and put compat translation there */
2136 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2137
2138 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2139 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2140 int maxtype, const struct nla_policy *policy,
2141 struct netlink_ext_ack *extack);
2142
2143 /* Translate 32-bit user_policy from sockptr */
2144 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2145
2146 struct module *owner;
2147};
2148
2149#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2150extern int xfrm_register_translator(struct xfrm_translator *xtr);
2151extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2152extern struct xfrm_translator *xfrm_get_translator(void);
2153extern void xfrm_put_translator(struct xfrm_translator *xtr);
2154#else
2155static inline struct xfrm_translator *xfrm_get_translator(void)
2156{
2157 return NULL;
2158}
2159static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2160{
2161}
2162#endif
2163
2164#if IS_ENABLED(CONFIG_IPV6)
2165static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2166{
2167 int proto;
2168
2169 if (!sk || sk->sk_family != AF_INET6)
2170 return false;
2171
2172 proto = sk->sk_protocol;
2173 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2174 return inet6_test_bit(DONTFRAG, sk);
2175
2176 return false;
2177}
2178#endif
2179
2180#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2181 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2182
2183extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2184
2185int register_xfrm_interface_bpf(void);
2186
2187#else
2188
2189static inline int register_xfrm_interface_bpf(void)
2190{
2191 return 0;
2192}
2193
2194#endif
2195
2196#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF)
2197int register_xfrm_state_bpf(void);
2198#else
2199static inline int register_xfrm_state_bpf(void)
2200{
2201 return 0;
2202}
2203#endif
2204
2205#endif /* _NET_XFRM_H */