xref: /linux/include/uapi/linux/xfrm.h (revision f531d13b)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _LINUX_XFRM_H
3 #define _LINUX_XFRM_H
4 
5 #include <linux/in6.h>
6 #include <linux/types.h>
7 #include <linux/stddef.h>
8 
9 /* All of the structures in this file may not change size as they are
10  * passed into the kernel from userspace via netlink sockets.
11  */
12 
13 /* Structure to encapsulate addresses. I do not want to use
14  * "standard" structure. My apologies.
15  */
16 typedef union {
17 	__be32		a4;
18 	__be32		a6[4];
19 	struct in6_addr	in6;
20 } xfrm_address_t;
21 
22 /* Ident of a specific xfrm_state. It is used on input to lookup
23  * the state by (spi,daddr,ah/esp) or to store information about
24  * spi, protocol and tunnel address on output.
25  */
26 struct xfrm_id {
27 	xfrm_address_t	daddr;
28 	__be32		spi;
29 	__u8		proto;
30 };
31 
32 struct xfrm_sec_ctx {
33 	__u8	ctx_doi;
34 	__u8	ctx_alg;
35 	__u16	ctx_len;
36 	__u32	ctx_sid;
37 	char	ctx_str[] __counted_by(ctx_len);
38 };
39 
40 /* Security Context Domains of Interpretation */
41 #define XFRM_SC_DOI_RESERVED 0
42 #define XFRM_SC_DOI_LSM 1
43 
44 /* Security Context Algorithms */
45 #define XFRM_SC_ALG_RESERVED 0
46 #define XFRM_SC_ALG_SELINUX 1
47 
48 /* Selector, used as selector both on policy rules (SPD) and SAs. */
49 
50 struct xfrm_selector {
51 	xfrm_address_t	daddr;
52 	xfrm_address_t	saddr;
53 	__be16	dport;
54 	__be16	dport_mask;
55 	__be16	sport;
56 	__be16	sport_mask;
57 	__u16	family;
58 	__u8	prefixlen_d;
59 	__u8	prefixlen_s;
60 	__u8	proto;
61 	int	ifindex;
62 	__kernel_uid32_t	user;
63 };
64 
65 #define XFRM_INF (~(__u64)0)
66 
67 struct xfrm_lifetime_cfg {
68 	__u64	soft_byte_limit;
69 	__u64	hard_byte_limit;
70 	__u64	soft_packet_limit;
71 	__u64	hard_packet_limit;
72 	__u64	soft_add_expires_seconds;
73 	__u64	hard_add_expires_seconds;
74 	__u64	soft_use_expires_seconds;
75 	__u64	hard_use_expires_seconds;
76 };
77 
78 struct xfrm_lifetime_cur {
79 	__u64	bytes;
80 	__u64	packets;
81 	__u64	add_time;
82 	__u64	use_time;
83 };
84 
85 struct xfrm_replay_state {
86 	__u32	oseq;
87 	__u32	seq;
88 	__u32	bitmap;
89 };
90 
91 #define XFRMA_REPLAY_ESN_MAX	4096
92 
93 struct xfrm_replay_state_esn {
94 	unsigned int	bmp_len;
95 	__u32		oseq;
96 	__u32		seq;
97 	__u32		oseq_hi;
98 	__u32		seq_hi;
99 	__u32		replay_window;
100 	__u32		bmp[];
101 };
102 
103 struct xfrm_algo {
104 	char		alg_name[64];
105 	unsigned int	alg_key_len;    /* in bits */
106 	char		alg_key[];
107 };
108 
109 struct xfrm_algo_auth {
110 	char		alg_name[64];
111 	unsigned int	alg_key_len;    /* in bits */
112 	unsigned int	alg_trunc_len;  /* in bits */
113 	char		alg_key[];
114 };
115 
116 struct xfrm_algo_aead {
117 	char		alg_name[64];
118 	unsigned int	alg_key_len;	/* in bits */
119 	unsigned int	alg_icv_len;	/* in bits */
120 	char		alg_key[];
121 };
122 
123 struct xfrm_stats {
124 	__u32	replay_window;
125 	__u32	replay;
126 	__u32	integrity_failed;
127 };
128 
129 enum {
130 	XFRM_POLICY_TYPE_MAIN	= 0,
131 	XFRM_POLICY_TYPE_SUB	= 1,
132 	XFRM_POLICY_TYPE_MAX	= 2,
133 	XFRM_POLICY_TYPE_ANY	= 255
134 };
135 
136 enum {
137 	XFRM_POLICY_IN	= 0,
138 	XFRM_POLICY_OUT	= 1,
139 	XFRM_POLICY_FWD	= 2,
140 	XFRM_POLICY_MASK = 3,
141 	XFRM_POLICY_MAX	= 3
142 };
143 
144 enum xfrm_sa_dir {
145 	XFRM_SA_DIR_IN	= 1,
146 	XFRM_SA_DIR_OUT = 2
147 };
148 
149 enum {
150 	XFRM_SHARE_ANY,		/* No limitations */
151 	XFRM_SHARE_SESSION,	/* For this session only */
152 	XFRM_SHARE_USER,	/* For this user only */
153 	XFRM_SHARE_UNIQUE	/* Use once */
154 };
155 
156 #define XFRM_MODE_TRANSPORT 0
157 #define XFRM_MODE_TUNNEL 1
158 #define XFRM_MODE_ROUTEOPTIMIZATION 2
159 #define XFRM_MODE_IN_TRIGGER 3
160 #define XFRM_MODE_BEET 4
161 #define XFRM_MODE_MAX 5
162 
163 /* Netlink configuration messages.  */
164 enum {
165 	XFRM_MSG_BASE = 0x10,
166 
167 	XFRM_MSG_NEWSA = 0x10,
168 #define XFRM_MSG_NEWSA XFRM_MSG_NEWSA
169 	XFRM_MSG_DELSA,
170 #define XFRM_MSG_DELSA XFRM_MSG_DELSA
171 	XFRM_MSG_GETSA,
172 #define XFRM_MSG_GETSA XFRM_MSG_GETSA
173 
174 	XFRM_MSG_NEWPOLICY,
175 #define XFRM_MSG_NEWPOLICY XFRM_MSG_NEWPOLICY
176 	XFRM_MSG_DELPOLICY,
177 #define XFRM_MSG_DELPOLICY XFRM_MSG_DELPOLICY
178 	XFRM_MSG_GETPOLICY,
179 #define XFRM_MSG_GETPOLICY XFRM_MSG_GETPOLICY
180 
181 	XFRM_MSG_ALLOCSPI,
182 #define XFRM_MSG_ALLOCSPI XFRM_MSG_ALLOCSPI
183 	XFRM_MSG_ACQUIRE,
184 #define XFRM_MSG_ACQUIRE XFRM_MSG_ACQUIRE
185 	XFRM_MSG_EXPIRE,
186 #define XFRM_MSG_EXPIRE XFRM_MSG_EXPIRE
187 
188 	XFRM_MSG_UPDPOLICY,
189 #define XFRM_MSG_UPDPOLICY XFRM_MSG_UPDPOLICY
190 	XFRM_MSG_UPDSA,
191 #define XFRM_MSG_UPDSA XFRM_MSG_UPDSA
192 
193 	XFRM_MSG_POLEXPIRE,
194 #define XFRM_MSG_POLEXPIRE XFRM_MSG_POLEXPIRE
195 
196 	XFRM_MSG_FLUSHSA,
197 #define XFRM_MSG_FLUSHSA XFRM_MSG_FLUSHSA
198 	XFRM_MSG_FLUSHPOLICY,
199 #define XFRM_MSG_FLUSHPOLICY XFRM_MSG_FLUSHPOLICY
200 
201 	XFRM_MSG_NEWAE,
202 #define XFRM_MSG_NEWAE XFRM_MSG_NEWAE
203 	XFRM_MSG_GETAE,
204 #define XFRM_MSG_GETAE XFRM_MSG_GETAE
205 
206 	XFRM_MSG_REPORT,
207 #define XFRM_MSG_REPORT XFRM_MSG_REPORT
208 
209 	XFRM_MSG_MIGRATE,
210 #define XFRM_MSG_MIGRATE XFRM_MSG_MIGRATE
211 
212 	XFRM_MSG_NEWSADINFO,
213 #define XFRM_MSG_NEWSADINFO XFRM_MSG_NEWSADINFO
214 	XFRM_MSG_GETSADINFO,
215 #define XFRM_MSG_GETSADINFO XFRM_MSG_GETSADINFO
216 
217 	XFRM_MSG_NEWSPDINFO,
218 #define XFRM_MSG_NEWSPDINFO XFRM_MSG_NEWSPDINFO
219 	XFRM_MSG_GETSPDINFO,
220 #define XFRM_MSG_GETSPDINFO XFRM_MSG_GETSPDINFO
221 
222 	XFRM_MSG_MAPPING,
223 #define XFRM_MSG_MAPPING XFRM_MSG_MAPPING
224 
225 	XFRM_MSG_SETDEFAULT,
226 #define XFRM_MSG_SETDEFAULT XFRM_MSG_SETDEFAULT
227 	XFRM_MSG_GETDEFAULT,
228 #define XFRM_MSG_GETDEFAULT XFRM_MSG_GETDEFAULT
229 	__XFRM_MSG_MAX
230 };
231 #define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)
232 
233 #define XFRM_NR_MSGTYPES (XFRM_MSG_MAX + 1 - XFRM_MSG_BASE)
234 
235 /*
236  * Generic LSM security context for communicating to user space
237  * NOTE: Same format as sadb_x_sec_ctx
238  */
239 struct xfrm_user_sec_ctx {
240 	__u16			len;
241 	__u16			exttype;
242 	__u8			ctx_alg;  /* LSMs: e.g., selinux == 1 */
243 	__u8			ctx_doi;
244 	__u16			ctx_len;
245 };
246 
247 struct xfrm_user_tmpl {
248 	struct xfrm_id		id;
249 	__u16			family;
250 	xfrm_address_t		saddr;
251 	__u32			reqid;
252 	__u8			mode;
253 	__u8			share;
254 	__u8			optional;
255 	__u32			aalgos;
256 	__u32			ealgos;
257 	__u32			calgos;
258 };
259 
260 struct xfrm_encap_tmpl {
261 	__u16		encap_type;
262 	__be16		encap_sport;
263 	__be16		encap_dport;
264 	xfrm_address_t	encap_oa;
265 };
266 
267 /* AEVENT flags  */
268 enum xfrm_ae_ftype_t {
269 	XFRM_AE_UNSPEC,
270 	XFRM_AE_RTHR=1,	/* replay threshold*/
271 	XFRM_AE_RVAL=2, /* replay value */
272 	XFRM_AE_LVAL=4, /* lifetime value */
273 	XFRM_AE_ETHR=8, /* expiry timer threshold */
274 	XFRM_AE_CR=16, /* Event cause is replay update */
275 	XFRM_AE_CE=32, /* Event cause is timer expiry */
276 	XFRM_AE_CU=64, /* Event cause is policy update */
277 	__XFRM_AE_MAX
278 
279 #define XFRM_AE_MAX (__XFRM_AE_MAX - 1)
280 };
281 
282 struct xfrm_userpolicy_type {
283 	__u8		type;
284 	__u16		reserved1;
285 	__u8		reserved2;
286 };
287 
288 /* Netlink message attributes.  */
289 enum xfrm_attr_type_t {
290 	XFRMA_UNSPEC,
291 	XFRMA_ALG_AUTH,		/* struct xfrm_algo */
292 	XFRMA_ALG_CRYPT,	/* struct xfrm_algo */
293 	XFRMA_ALG_COMP,		/* struct xfrm_algo */
294 	XFRMA_ENCAP,		/* struct xfrm_algo + struct xfrm_encap_tmpl */
295 	XFRMA_TMPL,		/* 1 or more struct xfrm_user_tmpl */
296 	XFRMA_SA,		/* struct xfrm_usersa_info  */
297 	XFRMA_POLICY,		/*struct xfrm_userpolicy_info */
298 	XFRMA_SEC_CTX,		/* struct xfrm_sec_ctx */
299 	XFRMA_LTIME_VAL,
300 	XFRMA_REPLAY_VAL,
301 	XFRMA_REPLAY_THRESH,
302 	XFRMA_ETIMER_THRESH,
303 	XFRMA_SRCADDR,		/* xfrm_address_t */
304 	XFRMA_COADDR,		/* xfrm_address_t */
305 	XFRMA_LASTUSED,		/* __u64 */
306 	XFRMA_POLICY_TYPE,	/* struct xfrm_userpolicy_type */
307 	XFRMA_MIGRATE,
308 	XFRMA_ALG_AEAD,		/* struct xfrm_algo_aead */
309 	XFRMA_KMADDRESS,        /* struct xfrm_user_kmaddress */
310 	XFRMA_ALG_AUTH_TRUNC,	/* struct xfrm_algo_auth */
311 	XFRMA_MARK,		/* struct xfrm_mark */
312 	XFRMA_TFCPAD,		/* __u32 */
313 	XFRMA_REPLAY_ESN_VAL,	/* struct xfrm_replay_state_esn */
314 	XFRMA_SA_EXTRA_FLAGS,	/* __u32 */
315 	XFRMA_PROTO,		/* __u8 */
316 	XFRMA_ADDRESS_FILTER,	/* struct xfrm_address_filter */
317 	XFRMA_PAD,
318 	XFRMA_OFFLOAD_DEV,	/* struct xfrm_user_offload */
319 	XFRMA_SET_MARK,		/* __u32 */
320 	XFRMA_SET_MARK_MASK,	/* __u32 */
321 	XFRMA_IF_ID,		/* __u32 */
322 	XFRMA_MTIMER_THRESH,	/* __u32 in seconds for input SA */
323 	XFRMA_SA_DIR,		/* __u8 */
324 	XFRMA_NAT_KEEPALIVE_INTERVAL,	/* __u32 in seconds for NAT keepalive */
325 	__XFRMA_MAX
326 
327 #define XFRMA_OUTPUT_MARK XFRMA_SET_MARK	/* Compatibility */
328 #define XFRMA_MAX (__XFRMA_MAX - 1)
329 };
330 
331 struct xfrm_mark {
332 	__u32           v; /* value */
333 	__u32           m; /* mask */
334 };
335 
336 enum xfrm_sadattr_type_t {
337 	XFRMA_SAD_UNSPEC,
338 	XFRMA_SAD_CNT,
339 	XFRMA_SAD_HINFO,
340 	__XFRMA_SAD_MAX
341 
342 #define XFRMA_SAD_MAX (__XFRMA_SAD_MAX - 1)
343 };
344 
345 struct xfrmu_sadhinfo {
346 	__u32 sadhcnt; /* current hash bkts */
347 	__u32 sadhmcnt; /* max allowed hash bkts */
348 };
349 
350 enum xfrm_spdattr_type_t {
351 	XFRMA_SPD_UNSPEC,
352 	XFRMA_SPD_INFO,
353 	XFRMA_SPD_HINFO,
354 	XFRMA_SPD_IPV4_HTHRESH,
355 	XFRMA_SPD_IPV6_HTHRESH,
356 	__XFRMA_SPD_MAX
357 
358 #define XFRMA_SPD_MAX (__XFRMA_SPD_MAX - 1)
359 };
360 
361 struct xfrmu_spdinfo {
362 	__u32 incnt;
363 	__u32 outcnt;
364 	__u32 fwdcnt;
365 	__u32 inscnt;
366 	__u32 outscnt;
367 	__u32 fwdscnt;
368 };
369 
370 struct xfrmu_spdhinfo {
371 	__u32 spdhcnt;
372 	__u32 spdhmcnt;
373 };
374 
375 struct xfrmu_spdhthresh {
376 	__u8 lbits;
377 	__u8 rbits;
378 };
379 
380 struct xfrm_usersa_info {
381 	struct xfrm_selector		sel;
382 	struct xfrm_id			id;
383 	xfrm_address_t			saddr;
384 	struct xfrm_lifetime_cfg	lft;
385 	struct xfrm_lifetime_cur	curlft;
386 	struct xfrm_stats		stats;
387 	__u32				seq;
388 	__u32				reqid;
389 	__u16				family;
390 	__u8				mode;		/* XFRM_MODE_xxx */
391 	__u8				replay_window;
392 	__u8				flags;
393 #define XFRM_STATE_NOECN	1
394 #define XFRM_STATE_DECAP_DSCP	2
395 #define XFRM_STATE_NOPMTUDISC	4
396 #define XFRM_STATE_WILDRECV	8
397 #define XFRM_STATE_ICMP		16
398 #define XFRM_STATE_AF_UNSPEC	32
399 #define XFRM_STATE_ALIGN4	64
400 #define XFRM_STATE_ESN		128
401 };
402 
403 #define XFRM_SA_XFLAG_DONT_ENCAP_DSCP	1
404 #define XFRM_SA_XFLAG_OSEQ_MAY_WRAP	2
405 
406 struct xfrm_usersa_id {
407 	xfrm_address_t			daddr;
408 	__be32				spi;
409 	__u16				family;
410 	__u8				proto;
411 };
412 
413 struct xfrm_aevent_id {
414 	struct xfrm_usersa_id		sa_id;
415 	xfrm_address_t			saddr;
416 	__u32				flags;
417 	__u32				reqid;
418 };
419 
420 struct xfrm_userspi_info {
421 	struct xfrm_usersa_info		info;
422 	__u32				min;
423 	__u32				max;
424 };
425 
426 struct xfrm_userpolicy_info {
427 	struct xfrm_selector		sel;
428 	struct xfrm_lifetime_cfg	lft;
429 	struct xfrm_lifetime_cur	curlft;
430 	__u32				priority;
431 	__u32				index;
432 	__u8				dir;
433 	__u8				action;
434 #define XFRM_POLICY_ALLOW	0
435 #define XFRM_POLICY_BLOCK	1
436 	__u8				flags;
437 #define XFRM_POLICY_LOCALOK	1	/* Allow user to override global policy */
438 	/* Automatically expand selector to include matching ICMP payloads. */
439 #define XFRM_POLICY_ICMP	2
440 	__u8				share;
441 };
442 
443 struct xfrm_userpolicy_id {
444 	struct xfrm_selector		sel;
445 	__u32				index;
446 	__u8				dir;
447 };
448 
449 struct xfrm_user_acquire {
450 	struct xfrm_id			id;
451 	xfrm_address_t			saddr;
452 	struct xfrm_selector		sel;
453 	struct xfrm_userpolicy_info	policy;
454 	__u32				aalgos;
455 	__u32				ealgos;
456 	__u32				calgos;
457 	__u32				seq;
458 };
459 
460 struct xfrm_user_expire {
461 	struct xfrm_usersa_info		state;
462 	__u8				hard;
463 };
464 
465 struct xfrm_user_polexpire {
466 	struct xfrm_userpolicy_info	pol;
467 	__u8				hard;
468 };
469 
470 struct xfrm_usersa_flush {
471 	__u8				proto;
472 };
473 
474 struct xfrm_user_report {
475 	__u8				proto;
476 	struct xfrm_selector		sel;
477 };
478 
479 /* Used by MIGRATE to pass addresses IKE should use to perform
480  * SA negotiation with the peer */
481 struct xfrm_user_kmaddress {
482 	xfrm_address_t                  local;
483 	xfrm_address_t                  remote;
484 	__u32				reserved;
485 	__u16				family;
486 };
487 
488 struct xfrm_user_migrate {
489 	xfrm_address_t			old_daddr;
490 	xfrm_address_t			old_saddr;
491 	xfrm_address_t			new_daddr;
492 	xfrm_address_t			new_saddr;
493 	__u8				proto;
494 	__u8				mode;
495 	__u16				reserved;
496 	__u32				reqid;
497 	__u16				old_family;
498 	__u16				new_family;
499 };
500 
501 struct xfrm_user_mapping {
502 	struct xfrm_usersa_id		id;
503 	__u32				reqid;
504 	xfrm_address_t			old_saddr;
505 	xfrm_address_t			new_saddr;
506 	__be16				old_sport;
507 	__be16				new_sport;
508 };
509 
510 struct xfrm_address_filter {
511 	xfrm_address_t			saddr;
512 	xfrm_address_t			daddr;
513 	__u16				family;
514 	__u8				splen;
515 	__u8				dplen;
516 };
517 
518 struct xfrm_user_offload {
519 	int				ifindex;
520 	__u8				flags;
521 };
522 /* This flag was exposed without any kernel code that supports it.
523  * Unfortunately, strongswan has the code that sets this flag,
524  * which makes it impossible to reuse this bit.
525  *
526  * So leave it here to make sure that it won't be reused by mistake.
527  */
528 #define XFRM_OFFLOAD_IPV6	1
529 #define XFRM_OFFLOAD_INBOUND	2
530 /* Two bits above are relevant for state path only, while
531  * offload is used for both policy and state flows.
532  *
533  * In policy offload mode, they are free and can be safely reused.
534  */
535 #define XFRM_OFFLOAD_PACKET	4
536 
537 struct xfrm_userpolicy_default {
538 #define XFRM_USERPOLICY_UNSPEC	0
539 #define XFRM_USERPOLICY_BLOCK	1
540 #define XFRM_USERPOLICY_ACCEPT	2
541 	__u8				in;
542 	__u8				fwd;
543 	__u8				out;
544 };
545 
546 #ifndef __KERNEL__
547 /* backwards compatibility for userspace */
548 #define XFRMGRP_ACQUIRE		1
549 #define XFRMGRP_EXPIRE		2
550 #define XFRMGRP_SA		4
551 #define XFRMGRP_POLICY		8
552 #define XFRMGRP_REPORT		0x20
553 #endif
554 
555 enum xfrm_nlgroups {
556 	XFRMNLGRP_NONE,
557 #define XFRMNLGRP_NONE		XFRMNLGRP_NONE
558 	XFRMNLGRP_ACQUIRE,
559 #define XFRMNLGRP_ACQUIRE	XFRMNLGRP_ACQUIRE
560 	XFRMNLGRP_EXPIRE,
561 #define XFRMNLGRP_EXPIRE	XFRMNLGRP_EXPIRE
562 	XFRMNLGRP_SA,
563 #define XFRMNLGRP_SA		XFRMNLGRP_SA
564 	XFRMNLGRP_POLICY,
565 #define XFRMNLGRP_POLICY	XFRMNLGRP_POLICY
566 	XFRMNLGRP_AEVENTS,
567 #define XFRMNLGRP_AEVENTS	XFRMNLGRP_AEVENTS
568 	XFRMNLGRP_REPORT,
569 #define XFRMNLGRP_REPORT	XFRMNLGRP_REPORT
570 	XFRMNLGRP_MIGRATE,
571 #define XFRMNLGRP_MIGRATE	XFRMNLGRP_MIGRATE
572 	XFRMNLGRP_MAPPING,
573 #define XFRMNLGRP_MAPPING	XFRMNLGRP_MAPPING
574 	__XFRMNLGRP_MAX
575 };
576 #define XFRMNLGRP_MAX	(__XFRMNLGRP_MAX - 1)
577 
578 #endif /* _LINUX_XFRM_H */
579