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/inet_dscp.h>
23#include <net/ip.h>
24#include <net/route.h>
25#include <net/ipv6.h>
26#include <net/ip6_fib.h>
27#include <net/flow.h>
28#include <net/gro_cells.h>
29
30#include <linux/interrupt.h>
31
32#ifdef CONFIG_XFRM_STATISTICS
33#include <net/snmp.h>
34#endif
35
36#define XFRM_PROTO_ESP 50
37#define XFRM_PROTO_AH 51
38#define XFRM_PROTO_COMP 108
39#define XFRM_PROTO_IPIP 4
40#define XFRM_PROTO_IPV6 41
41#define XFRM_PROTO_IPTFS IPPROTO_AGGFRAG
42#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
43#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
44
45#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
46#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
47#define MODULE_ALIAS_XFRM_MODE(family, encap) \
48 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
49#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
51#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
52 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
53
54#ifdef CONFIG_XFRM_STATISTICS
55#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
56#define XFRM_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.xfrm_statistics, field, val)
57#else
58#define XFRM_INC_STATS(net, field) ((void)(net))
59#define XFRM_ADD_STATS(net, field, val) ((void)(net))
60#endif
61
62
63/* Organization of SPD aka "XFRM rules"
64 ------------------------------------
65
66 Basic objects:
67 - policy rule, struct xfrm_policy (=SPD entry)
68 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
69 - instance of a transformer, struct xfrm_state (=SA)
70 - template to clone xfrm_state, struct xfrm_tmpl
71
72 SPD is organized as hash table (for policies that meet minimum address prefix
73 length setting, net->xfrm.policy_hthresh). Other policies are stored in
74 lists, sorted into rbtree ordered by destination and source address networks.
75 See net/xfrm/xfrm_policy.c for details.
76
77 (To be compatible with existing pfkeyv2 implementations,
78 many rules with priority of 0x7fffffff are allowed to exist and
79 such rules are ordered in an unpredictable way, thanks to bsd folks.)
80
81 If "action" is "block", then we prohibit the flow, otherwise:
82 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
83 policy entry has list of up to XFRM_MAX_DEPTH transformations,
84 described by templates xfrm_tmpl. Each template is resolved
85 to a complete xfrm_state (see below) and we pack bundle of transformations
86 to a dst_entry returned to requester.
87
88 dst -. xfrm .-> xfrm_state #1
89 |---. child .-> dst -. xfrm .-> xfrm_state #2
90 |---. child .-> dst -. xfrm .-> xfrm_state #3
91 |---. child .-> NULL
92
93
94 Resolution of xrfm_tmpl
95 -----------------------
96 Template contains:
97 1. ->mode Mode: transport or tunnel
98 2. ->id.proto Protocol: AH/ESP/IPCOMP
99 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
100 Q: allow to resolve security gateway?
101 4. ->id.spi If not zero, static SPI.
102 5. ->saddr Local tunnel endpoint, ignored for transport mode.
103 6. ->algos List of allowed algos. Plain bitmask now.
104 Q: ealgos, aalgos, calgos. What a mess...
105 7. ->share Sharing mode.
106 Q: how to implement private sharing mode? To add struct sock* to
107 flow id?
108
109 Having this template we search through SAD searching for entries
110 with appropriate mode/proto/algo, permitted by selector.
111 If no appropriate entry found, it is requested from key manager.
112
113 PROBLEMS:
114 Q: How to find all the bundles referring to a physical path for
115 PMTU discovery? Seems, dst should contain list of all parents...
116 and enter to infinite locking hierarchy disaster.
117 No! It is easier, we will not search for them, let them find us.
118 We add genid to each dst plus pointer to genid of raw IP route,
119 pmtu disc will update pmtu on raw IP route and increase its genid.
120 dst_check() will see this for top level and trigger resyncing
121 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
122 */
123
124struct xfrm_state_walk {
125 struct list_head all;
126 u8 state;
127 u8 dying;
128 u8 proto;
129 u32 seq;
130 struct xfrm_address_filter *filter;
131};
132
133enum {
134 XFRM_DEV_OFFLOAD_IN = 1,
135 XFRM_DEV_OFFLOAD_OUT,
136 XFRM_DEV_OFFLOAD_FWD,
137};
138
139enum {
140 XFRM_DEV_OFFLOAD_UNSPECIFIED,
141 XFRM_DEV_OFFLOAD_CRYPTO,
142 XFRM_DEV_OFFLOAD_PACKET,
143};
144
145enum {
146 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
147};
148
149struct xfrm_dev_offload {
150 /* The device for this offload.
151 * Device drivers should not use this directly, as that will prevent
152 * them from working with bonding device. Instead, the device passed
153 * to the add/delete callbacks should be used.
154 */
155 struct net_device *dev;
156 netdevice_tracker dev_tracker;
157 /* This is a private pointer used by the bonding driver (and eventually
158 * should be moved there). Device drivers should not use it.
159 * Protected by xfrm_state.lock AND bond.ipsec_lock in most cases,
160 * except in the .xdo_dev_state_del() flow, where only xfrm_state.lock
161 * is held.
162 */
163 struct net_device *real_dev;
164 unsigned long offload_handle;
165 u8 dir : 2;
166 u8 type : 2;
167 u8 flags : 2;
168};
169
170struct xfrm_mode {
171 u8 encap;
172 u8 family;
173 u8 flags;
174};
175
176/* Flags for xfrm_mode. */
177enum {
178 XFRM_MODE_FLAG_TUNNEL = 1,
179};
180
181enum xfrm_replay_mode {
182 XFRM_REPLAY_MODE_LEGACY,
183 XFRM_REPLAY_MODE_BMP,
184 XFRM_REPLAY_MODE_ESN,
185};
186
187/* Full description of state of transformer. */
188struct xfrm_state {
189 possible_net_t xs_net;
190 union {
191 struct hlist_node gclist;
192 struct hlist_node bydst;
193 };
194 union {
195 struct hlist_node dev_gclist;
196 struct hlist_node bysrc;
197 };
198 struct hlist_node byspi;
199 struct hlist_node byseq;
200 struct hlist_node state_cache;
201 struct hlist_node state_cache_input;
202
203 refcount_t refcnt;
204 spinlock_t lock;
205
206 u32 pcpu_num;
207 struct xfrm_id id;
208 struct xfrm_selector sel;
209 struct xfrm_mark mark;
210 u32 if_id;
211 u32 tfcpad;
212
213 u32 genid;
214
215 /* Key manager bits */
216 struct xfrm_state_walk km;
217
218 /* Parameters of this state. */
219 struct {
220 u32 reqid;
221 u8 mode;
222 u8 replay_window;
223 u8 aalgo, ealgo, calgo;
224 u8 flags;
225 u16 family;
226 xfrm_address_t saddr;
227 int header_len;
228 int enc_hdr_len;
229 int trailer_len;
230 u32 extra_flags;
231 struct xfrm_mark smark;
232 } props;
233
234 struct xfrm_lifetime_cfg lft;
235
236 /* Data for transformer */
237 struct xfrm_algo_auth *aalg;
238 struct xfrm_algo *ealg;
239 struct xfrm_algo *calg;
240 struct xfrm_algo_aead *aead;
241 const char *geniv;
242
243 /* mapping change rate limiting */
244 __be16 new_mapping_sport;
245 u32 new_mapping; /* seconds */
246 u32 mapping_maxage; /* seconds for input SA */
247
248 /* Data for encapsulator */
249 struct xfrm_encap_tmpl *encap;
250
251 /* NAT keepalive */
252 u32 nat_keepalive_interval; /* seconds */
253 time64_t nat_keepalive_expiration;
254
255 /* Data for care-of address */
256 xfrm_address_t *coaddr;
257
258 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
259 struct xfrm_state *tunnel;
260
261 /* If a tunnel, number of users + 1 */
262 atomic_t tunnel_users;
263
264 /* State for replay detection */
265 struct xfrm_replay_state replay;
266 struct xfrm_replay_state_esn *replay_esn;
267
268 /* Replay detection state at the time we sent the last notification */
269 struct xfrm_replay_state preplay;
270 struct xfrm_replay_state_esn *preplay_esn;
271
272 /* replay detection mode */
273 enum xfrm_replay_mode repl_mode;
274 /* internal flag that only holds state for delayed aevent at the
275 * moment
276 */
277 u32 xflags;
278
279 /* Replay detection notification settings */
280 u32 replay_maxage;
281 u32 replay_maxdiff;
282
283 /* Replay detection notification timer */
284 struct timer_list rtimer;
285
286 /* Statistics */
287 struct xfrm_stats stats;
288
289 struct xfrm_lifetime_cur curlft;
290 struct hrtimer mtimer;
291
292 struct xfrm_dev_offload xso;
293
294 /* used to fix curlft->add_time when changing date */
295 long saved_tmo;
296
297 /* Last used time */
298 time64_t lastused;
299
300 struct page_frag xfrag;
301
302 /* Reference to data common to all the instances of this
303 * transformer. */
304 const struct xfrm_type *type;
305 struct xfrm_mode inner_mode;
306 struct xfrm_mode inner_mode_iaf;
307 struct xfrm_mode outer_mode;
308
309 const struct xfrm_type_offload *type_offload;
310
311 /* Security context */
312 struct xfrm_sec_ctx *security;
313
314 /* Private data of this transformer, format is opaque,
315 * interpreted by xfrm_type methods. */
316 void *data;
317 u8 dir;
318
319 const struct xfrm_mode_cbs *mode_cbs;
320 void *mode_data;
321};
322
323static inline struct net *xs_net(struct xfrm_state *x)
324{
325 return read_pnet(pnet: &x->xs_net);
326}
327
328/* xflags - make enum if more show up */
329#define XFRM_TIME_DEFER 1
330#define XFRM_SOFT_EXPIRE 2
331
332enum {
333 XFRM_STATE_VOID,
334 XFRM_STATE_ACQ,
335 XFRM_STATE_VALID,
336 XFRM_STATE_ERROR,
337 XFRM_STATE_EXPIRED,
338 XFRM_STATE_DEAD
339};
340
341/* callback structure passed from either netlink or pfkey */
342struct km_event {
343 union {
344 u32 hard;
345 u32 proto;
346 u32 byid;
347 u32 aevent;
348 u32 type;
349 } data;
350
351 u32 seq;
352 u32 portid;
353 u32 event;
354 struct net *net;
355};
356
357struct xfrm_if_decode_session_result {
358 struct net *net;
359 u32 if_id;
360};
361
362struct xfrm_if_cb {
363 bool (*decode_session)(struct sk_buff *skb,
364 unsigned short family,
365 struct xfrm_if_decode_session_result *res);
366};
367
368void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
369void xfrm_if_unregister_cb(void);
370
371struct xfrm_dst_lookup_params {
372 struct net *net;
373 dscp_t dscp;
374 int oif;
375 xfrm_address_t *saddr;
376 xfrm_address_t *daddr;
377 u32 mark;
378 __u8 ipproto;
379 union flowi_uli uli;
380};
381
382struct net_device;
383struct xfrm_type;
384struct xfrm_dst;
385struct xfrm_policy_afinfo {
386 struct dst_ops *dst_ops;
387 struct dst_entry *(*dst_lookup)(const struct xfrm_dst_lookup_params *params);
388 int (*get_saddr)(xfrm_address_t *saddr,
389 const struct xfrm_dst_lookup_params *params);
390 int (*fill_dst)(struct xfrm_dst *xdst,
391 struct net_device *dev,
392 const struct flowi *fl);
393 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
394};
395
396int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
397void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
398void km_policy_notify(struct xfrm_policy *xp, int dir,
399 const struct km_event *c);
400void km_state_notify(struct xfrm_state *x, const struct km_event *c);
401
402struct xfrm_tmpl;
403int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
404 struct xfrm_policy *pol);
405void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
406int __xfrm_state_delete(struct xfrm_state *x);
407
408struct xfrm_state_afinfo {
409 u8 family;
410 u8 proto;
411
412 const struct xfrm_type_offload *type_offload_esp;
413
414 const struct xfrm_type *type_esp;
415 const struct xfrm_type *type_ipip;
416 const struct xfrm_type *type_ipip6;
417 const struct xfrm_type *type_comp;
418 const struct xfrm_type *type_ah;
419 const struct xfrm_type *type_routing;
420 const struct xfrm_type *type_dstopts;
421
422 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
423 int (*transport_finish)(struct sk_buff *skb,
424 int async);
425 void (*local_error)(struct sk_buff *skb, u32 mtu);
426};
427
428int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
429int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
430struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
431struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
432
433struct xfrm_input_afinfo {
434 u8 family;
435 bool is_ipip;
436 int (*callback)(struct sk_buff *skb, u8 protocol,
437 int err);
438};
439
440int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
441int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
442
443void xfrm_flush_gc(void);
444void xfrm_state_delete_tunnel(struct xfrm_state *x);
445
446struct xfrm_type {
447 struct module *owner;
448 u8 proto;
449 u8 flags;
450#define XFRM_TYPE_NON_FRAGMENT 1
451#define XFRM_TYPE_REPLAY_PROT 2
452#define XFRM_TYPE_LOCAL_COADDR 4
453#define XFRM_TYPE_REMOTE_COADDR 8
454
455 int (*init_state)(struct xfrm_state *x,
456 struct netlink_ext_ack *extack);
457 void (*destructor)(struct xfrm_state *);
458 int (*input)(struct xfrm_state *, struct sk_buff *skb);
459 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
460 int (*reject)(struct xfrm_state *, struct sk_buff *,
461 const struct flowi *);
462};
463
464int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
465void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
466
467struct xfrm_type_offload {
468 struct module *owner;
469 u8 proto;
470 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
471 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
472 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
473};
474
475int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
476void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
477void xfrm_set_type_offload(struct xfrm_state *x);
478static inline void xfrm_unset_type_offload(struct xfrm_state *x)
479{
480 if (!x->type_offload)
481 return;
482
483 module_put(module: x->type_offload->owner);
484 x->type_offload = NULL;
485}
486
487/**
488 * struct xfrm_mode_cbs - XFRM mode callbacks
489 * @owner: module owner or NULL
490 * @init_state: Add/init mode specific state in `xfrm_state *x`
491 * @clone_state: Copy mode specific values from `orig` to new state `x`
492 * @destroy_state: Cleanup mode specific state from `xfrm_state *x`
493 * @user_init: Process mode specific netlink attributes from user
494 * @copy_to_user: Add netlink attributes to `attrs` based on state in `x`
495 * @sa_len: Return space required to store mode specific netlink attributes
496 * @get_inner_mtu: Return avail payload space after removing encap overhead
497 * @input: Process received packet from SA using mode
498 * @output: Output given packet using mode
499 * @prepare_output: Add mode specific encapsulation to packet in skb. On return
500 * `transport_header` should point at ESP header, `network_header` should
501 * point at outer IP header and `mac_header` should opint at the
502 * protocol/nexthdr field of the outer IP.
503 *
504 * One should examine and understand the specific uses of these callbacks in
505 * xfrm for further detail on how and when these functions are called. RTSL.
506 */
507struct xfrm_mode_cbs {
508 struct module *owner;
509 int (*init_state)(struct xfrm_state *x);
510 int (*clone_state)(struct xfrm_state *x, struct xfrm_state *orig);
511 void (*destroy_state)(struct xfrm_state *x);
512 int (*user_init)(struct net *net, struct xfrm_state *x,
513 struct nlattr **attrs,
514 struct netlink_ext_ack *extack);
515 int (*copy_to_user)(struct xfrm_state *x, struct sk_buff *skb);
516 unsigned int (*sa_len)(const struct xfrm_state *x);
517 u32 (*get_inner_mtu)(struct xfrm_state *x, int outer_mtu);
518 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
519 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
520 int (*prepare_output)(struct xfrm_state *x, struct sk_buff *skb);
521};
522
523int xfrm_register_mode_cbs(u8 mode, const struct xfrm_mode_cbs *mode_cbs);
524void xfrm_unregister_mode_cbs(u8 mode);
525
526static inline int xfrm_af2proto(unsigned int family)
527{
528 switch(family) {
529 case AF_INET:
530 return IPPROTO_IPIP;
531 case AF_INET6:
532 return IPPROTO_IPV6;
533 default:
534 return 0;
535 }
536}
537
538static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
539{
540 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
541 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
542 return &x->inner_mode;
543 else
544 return &x->inner_mode_iaf;
545}
546
547struct xfrm_tmpl {
548/* id in template is interpreted as:
549 * daddr - destination of tunnel, may be zero for transport mode.
550 * spi - zero to acquire spi. Not zero if spi is static, then
551 * daddr must be fixed too.
552 * proto - AH/ESP/IPCOMP
553 */
554 struct xfrm_id id;
555
556/* Source address of tunnel. Ignored, if it is not a tunnel. */
557 xfrm_address_t saddr;
558
559 unsigned short encap_family;
560
561 u32 reqid;
562
563/* Mode: transport, tunnel etc. */
564 u8 mode;
565
566/* Sharing mode: unique, this session only, this user only etc. */
567 u8 share;
568
569/* May skip this transfomration if no SA is found */
570 u8 optional;
571
572/* Skip aalgos/ealgos/calgos checks. */
573 u8 allalgs;
574
575/* Bit mask of algos allowed for acquisition */
576 u32 aalgos;
577 u32 ealgos;
578 u32 calgos;
579};
580
581#define XFRM_MAX_DEPTH 6
582#define XFRM_MAX_OFFLOAD_DEPTH 1
583
584struct xfrm_policy_walk_entry {
585 struct list_head all;
586 u8 dead;
587};
588
589struct xfrm_policy_walk {
590 struct xfrm_policy_walk_entry walk;
591 u8 type;
592 u32 seq;
593};
594
595struct xfrm_policy_queue {
596 struct sk_buff_head hold_queue;
597 struct timer_list hold_timer;
598 unsigned long timeout;
599};
600
601/**
602 * struct xfrm_policy - xfrm policy
603 * @xp_net: network namespace the policy lives in
604 * @bydst: hlist node for SPD hash table or rbtree list
605 * @byidx: hlist node for index hash table
606 * @state_cache_list: hlist head for policy cached xfrm states
607 * @lock: serialize changes to policy structure members
608 * @refcnt: reference count, freed once it reaches 0
609 * @pos: kernel internal tie-breaker to determine age of policy
610 * @timer: timer
611 * @genid: generation, used to invalidate old policies
612 * @priority: priority, set by userspace
613 * @index: policy index (autogenerated)
614 * @if_id: virtual xfrm interface id
615 * @mark: packet mark
616 * @selector: selector
617 * @lft: liftime configuration data
618 * @curlft: liftime state
619 * @walk: list head on pernet policy list
620 * @polq: queue to hold packets while aqcuire operaion in progress
621 * @bydst_reinsert: policy tree node needs to be merged
622 * @type: XFRM_POLICY_TYPE_MAIN or _SUB
623 * @action: XFRM_POLICY_ALLOW or _BLOCK
624 * @flags: XFRM_POLICY_LOCALOK, XFRM_POLICY_ICMP
625 * @xfrm_nr: number of used templates in @xfrm_vec
626 * @family: protocol family
627 * @security: SELinux security label
628 * @xfrm_vec: array of templates to resolve state
629 * @rcu: rcu head, used to defer memory release
630 * @xdo: hardware offload state
631 */
632struct xfrm_policy {
633 possible_net_t xp_net;
634 struct hlist_node bydst;
635 struct hlist_node byidx;
636
637 struct hlist_head state_cache_list;
638
639 /* This lock only affects elements except for entry. */
640 rwlock_t lock;
641 refcount_t refcnt;
642 u32 pos;
643 struct timer_list timer;
644
645 atomic_t genid;
646 u32 priority;
647 u32 index;
648 u32 if_id;
649 struct xfrm_mark mark;
650 struct xfrm_selector selector;
651 struct xfrm_lifetime_cfg lft;
652 struct xfrm_lifetime_cur curlft;
653 struct xfrm_policy_walk_entry walk;
654 struct xfrm_policy_queue polq;
655 bool bydst_reinsert;
656 u8 type;
657 u8 action;
658 u8 flags;
659 u8 xfrm_nr;
660 u16 family;
661 struct xfrm_sec_ctx *security;
662 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
663 struct rcu_head rcu;
664
665 struct xfrm_dev_offload xdo;
666};
667
668static inline struct net *xp_net(const struct xfrm_policy *xp)
669{
670 return read_pnet(pnet: &xp->xp_net);
671}
672
673struct xfrm_kmaddress {
674 xfrm_address_t local;
675 xfrm_address_t remote;
676 u32 reserved;
677 u16 family;
678};
679
680struct xfrm_migrate {
681 xfrm_address_t old_daddr;
682 xfrm_address_t old_saddr;
683 xfrm_address_t new_daddr;
684 xfrm_address_t new_saddr;
685 u8 proto;
686 u8 mode;
687 u16 reserved;
688 u32 reqid;
689 u16 old_family;
690 u16 new_family;
691};
692
693#define XFRM_KM_TIMEOUT 30
694/* what happened */
695#define XFRM_REPLAY_UPDATE XFRM_AE_CR
696#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
697
698/* default aevent timeout in units of 100ms */
699#define XFRM_AE_ETIME 10
700/* Async Event timer multiplier */
701#define XFRM_AE_ETH_M 10
702/* default seq threshold size */
703#define XFRM_AE_SEQT_SIZE 2
704
705struct xfrm_mgr {
706 struct list_head list;
707 int (*notify)(struct xfrm_state *x, const struct km_event *c);
708 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
709 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
710 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
711 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
712 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
713 int (*migrate)(const struct xfrm_selector *sel,
714 u8 dir, u8 type,
715 const struct xfrm_migrate *m,
716 int num_bundles,
717 const struct xfrm_kmaddress *k,
718 const struct xfrm_encap_tmpl *encap);
719 bool (*is_alive)(const struct km_event *c);
720};
721
722void xfrm_register_km(struct xfrm_mgr *km);
723void xfrm_unregister_km(struct xfrm_mgr *km);
724
725struct xfrm_tunnel_skb_cb {
726 union {
727 struct inet_skb_parm h4;
728 struct inet6_skb_parm h6;
729 } header;
730
731 union {
732 struct ip_tunnel *ip4;
733 struct ip6_tnl *ip6;
734 } tunnel;
735};
736
737#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
738
739/*
740 * This structure is used for the duration where packets are being
741 * transformed by IPsec. As soon as the packet leaves IPsec the
742 * area beyond the generic IP part may be overwritten.
743 */
744struct xfrm_skb_cb {
745 struct xfrm_tunnel_skb_cb header;
746
747 /* Sequence number for replay protection. */
748 union {
749 struct {
750 __u32 low;
751 __u32 hi;
752 } output;
753 struct {
754 __be32 low;
755 __be32 hi;
756 } input;
757 } seq;
758};
759
760#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
761
762/*
763 * This structure is used by the afinfo prepare_input/prepare_output functions
764 * to transmit header information to the mode input/output functions.
765 */
766struct xfrm_mode_skb_cb {
767 struct xfrm_tunnel_skb_cb header;
768
769 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
770 __be16 id;
771 __be16 frag_off;
772
773 /* IP header length (excluding options or extension headers). */
774 u8 ihl;
775
776 /* TOS for IPv4, class for IPv6. */
777 u8 tos;
778
779 /* TTL for IPv4, hop limitfor IPv6. */
780 u8 ttl;
781
782 /* Protocol for IPv4, NH for IPv6. */
783 u8 protocol;
784
785 /* Option length for IPv4, zero for IPv6. */
786 u8 optlen;
787
788 /* Used by IPv6 only, zero for IPv4. */
789 u8 flow_lbl[3];
790};
791
792#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
793
794/*
795 * This structure is used by the input processing to locate the SPI and
796 * related information.
797 */
798struct xfrm_spi_skb_cb {
799 struct xfrm_tunnel_skb_cb header;
800
801 unsigned int daddroff;
802 unsigned int family;
803 __be32 seq;
804};
805
806#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
807
808#ifdef CONFIG_AUDITSYSCALL
809static inline struct audit_buffer *xfrm_audit_start(const char *op)
810{
811 struct audit_buffer *audit_buf = NULL;
812
813 if (audit_enabled == AUDIT_OFF)
814 return NULL;
815 audit_buf = audit_log_start(ctx: audit_context(), GFP_ATOMIC,
816 AUDIT_MAC_IPSEC_EVENT);
817 if (audit_buf == NULL)
818 return NULL;
819 audit_log_format(ab: audit_buf, fmt: "op=%s", op);
820 return audit_buf;
821}
822
823static inline void xfrm_audit_helper_usrinfo(bool task_valid,
824 struct audit_buffer *audit_buf)
825{
826 const unsigned int auid = from_kuid(to: &init_user_ns, uid: task_valid ?
827 audit_get_loginuid(current) :
828 INVALID_UID);
829 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
830 AUDIT_SID_UNSET;
831
832 audit_log_format(ab: audit_buf, fmt: " auid=%u ses=%u", auid, ses);
833 audit_log_task_context(ab: audit_buf);
834}
835
836void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
837void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
838 bool task_valid);
839void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
840void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
841void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
842 struct sk_buff *skb);
843void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
844 __be32 net_seq);
845void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
846void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
847 __be32 net_seq);
848void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
849 u8 proto);
850#else
851
852static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
853 bool task_valid)
854{
855}
856
857static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
858 bool task_valid)
859{
860}
861
862static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
863 bool task_valid)
864{
865}
866
867static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
868 bool task_valid)
869{
870}
871
872static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
873 struct sk_buff *skb)
874{
875}
876
877static inline void xfrm_audit_state_replay(struct xfrm_state *x,
878 struct sk_buff *skb, __be32 net_seq)
879{
880}
881
882static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
883 u16 family)
884{
885}
886
887static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
888 __be32 net_spi, __be32 net_seq)
889{
890}
891
892static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
893 struct sk_buff *skb, u8 proto)
894{
895}
896#endif /* CONFIG_AUDITSYSCALL */
897
898static inline void xfrm_pol_hold(struct xfrm_policy *policy)
899{
900 if (likely(policy != NULL))
901 refcount_inc(r: &policy->refcnt);
902}
903
904void xfrm_policy_destroy(struct xfrm_policy *policy);
905
906static inline void xfrm_pol_put(struct xfrm_policy *policy)
907{
908 if (refcount_dec_and_test(r: &policy->refcnt))
909 xfrm_policy_destroy(policy);
910}
911
912static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
913{
914 int i;
915 for (i = npols - 1; i >= 0; --i)
916 xfrm_pol_put(policy: pols[i]);
917}
918
919void __xfrm_state_destroy(struct xfrm_state *, bool);
920
921static inline void __xfrm_state_put(struct xfrm_state *x)
922{
923 refcount_dec(r: &x->refcnt);
924}
925
926static inline void xfrm_state_put(struct xfrm_state *x)
927{
928 if (refcount_dec_and_test(r: &x->refcnt))
929 __xfrm_state_destroy(x, false);
930}
931
932static inline void xfrm_state_put_sync(struct xfrm_state *x)
933{
934 if (refcount_dec_and_test(r: &x->refcnt))
935 __xfrm_state_destroy(x, true);
936}
937
938static inline void xfrm_state_hold(struct xfrm_state *x)
939{
940 refcount_inc(r: &x->refcnt);
941}
942
943static inline bool addr_match(const void *token1, const void *token2,
944 unsigned int prefixlen)
945{
946 const __be32 *a1 = token1;
947 const __be32 *a2 = token2;
948 unsigned int pdw;
949 unsigned int pbi;
950
951 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
952 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
953
954 if (pdw)
955 if (memcmp(p: a1, q: a2, size: pdw << 2))
956 return false;
957
958 if (pbi) {
959 __be32 mask;
960
961 mask = htonl((0xffffffff) << (32 - pbi));
962
963 if ((a1[pdw] ^ a2[pdw]) & mask)
964 return false;
965 }
966
967 return true;
968}
969
970static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
971{
972 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
973 if (sizeof(long) == 4 && prefixlen == 0)
974 return true;
975 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
976}
977
978static __inline__
979__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
980{
981 __be16 port;
982 switch(fl->flowi_proto) {
983 case IPPROTO_TCP:
984 case IPPROTO_UDP:
985 case IPPROTO_UDPLITE:
986 case IPPROTO_SCTP:
987 port = uli->ports.sport;
988 break;
989 case IPPROTO_ICMP:
990 case IPPROTO_ICMPV6:
991 port = htons(uli->icmpt.type);
992 break;
993 case IPPROTO_MH:
994 port = htons(uli->mht.type);
995 break;
996 case IPPROTO_GRE:
997 port = htons(ntohl(uli->gre_key) >> 16);
998 break;
999 default:
1000 port = 0; /*XXX*/
1001 }
1002 return port;
1003}
1004
1005static __inline__
1006__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
1007{
1008 __be16 port;
1009 switch(fl->flowi_proto) {
1010 case IPPROTO_TCP:
1011 case IPPROTO_UDP:
1012 case IPPROTO_UDPLITE:
1013 case IPPROTO_SCTP:
1014 port = uli->ports.dport;
1015 break;
1016 case IPPROTO_ICMP:
1017 case IPPROTO_ICMPV6:
1018 port = htons(uli->icmpt.code);
1019 break;
1020 case IPPROTO_GRE:
1021 port = htons(ntohl(uli->gre_key) & 0xffff);
1022 break;
1023 default:
1024 port = 0; /*XXX*/
1025 }
1026 return port;
1027}
1028
1029bool xfrm_selector_match(const struct xfrm_selector *sel,
1030 const struct flowi *fl, unsigned short family);
1031
1032#ifdef CONFIG_SECURITY_NETWORK_XFRM
1033/* If neither has a context --> match
1034 * Otherwise, both must have a context and the sids, doi, alg must match
1035 */
1036static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
1037{
1038 return ((!s1 && !s2) ||
1039 (s1 && s2 &&
1040 (s1->ctx_sid == s2->ctx_sid) &&
1041 (s1->ctx_doi == s2->ctx_doi) &&
1042 (s1->ctx_alg == s2->ctx_alg)));
1043}
1044#else
1045static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
1046{
1047 return true;
1048}
1049#endif
1050
1051/* A struct encoding bundle of transformations to apply to some set of flow.
1052 *
1053 * xdst->child points to the next element of bundle.
1054 * dst->xfrm points to an instanse of transformer.
1055 *
1056 * Due to unfortunate limitations of current routing cache, which we
1057 * have no time to fix, it mirrors struct rtable and bound to the same
1058 * routing key, including saddr,daddr. However, we can have many of
1059 * bundles differing by session id. All the bundles grow from a parent
1060 * policy rule.
1061 */
1062struct xfrm_dst {
1063 union {
1064 struct dst_entry dst;
1065 struct rtable rt;
1066 struct rt6_info rt6;
1067 } u;
1068 struct dst_entry *route;
1069 struct dst_entry *child;
1070 struct dst_entry *path;
1071 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1072 int num_pols, num_xfrms;
1073 u32 xfrm_genid;
1074 u32 policy_genid;
1075 u32 route_mtu_cached;
1076 u32 child_mtu_cached;
1077 u32 route_cookie;
1078 u32 path_cookie;
1079};
1080
1081static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1082{
1083#ifdef CONFIG_XFRM
1084 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
1085 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1086
1087 return xdst->path;
1088 }
1089#endif
1090 return (struct dst_entry *) dst;
1091}
1092
1093static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1094{
1095#ifdef CONFIG_XFRM
1096 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
1097 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1098 return xdst->child;
1099 }
1100#endif
1101 return NULL;
1102}
1103
1104#ifdef CONFIG_XFRM
1105static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1106{
1107 xdst->child = child;
1108}
1109
1110static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1111{
1112 xfrm_pols_put(pols: xdst->pols, npols: xdst->num_pols);
1113 dst_release(dst: xdst->route);
1114 if (likely(xdst->u.dst.xfrm))
1115 xfrm_state_put(x: xdst->u.dst.xfrm);
1116}
1117#endif
1118
1119void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1120
1121struct xfrm_if_parms {
1122 int link; /* ifindex of underlying L2 interface */
1123 u32 if_id; /* interface identifier */
1124 bool collect_md;
1125};
1126
1127struct xfrm_if {
1128 struct xfrm_if __rcu *next; /* next interface in list */
1129 struct net_device *dev; /* virtual device associated with interface */
1130 struct net *net; /* netns for packet i/o */
1131 struct xfrm_if_parms p; /* interface parms */
1132
1133 struct gro_cells gro_cells;
1134};
1135
1136struct xfrm_offload {
1137 /* Output sequence number for replay protection on offloading. */
1138 struct {
1139 __u32 low;
1140 __u32 hi;
1141 } seq;
1142
1143 __u32 flags;
1144#define SA_DELETE_REQ 1
1145#define CRYPTO_DONE 2
1146#define CRYPTO_NEXT_DONE 4
1147#define CRYPTO_FALLBACK 8
1148#define XFRM_GSO_SEGMENT 16
1149#define XFRM_GRO 32
1150/* 64 is free */
1151#define XFRM_DEV_RESUME 128
1152#define XFRM_XMIT 256
1153
1154 __u32 status;
1155#define CRYPTO_SUCCESS 1
1156#define CRYPTO_GENERIC_ERROR 2
1157#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1158#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1159#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1160#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1161#define CRYPTO_INVALID_PACKET_SYNTAX 64
1162#define CRYPTO_INVALID_PROTOCOL 128
1163
1164 /* Used to keep whole l2 header for transport mode GRO */
1165 __u32 orig_mac_len;
1166
1167 __u8 proto;
1168 __u8 inner_ipproto;
1169};
1170
1171struct sec_path {
1172 int len;
1173 int olen;
1174 int verified_cnt;
1175
1176 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1177 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1178};
1179
1180struct sec_path *secpath_set(struct sk_buff *skb);
1181
1182static inline void
1183secpath_reset(struct sk_buff *skb)
1184{
1185#ifdef CONFIG_XFRM
1186 skb_ext_del(skb, id: SKB_EXT_SEC_PATH);
1187#endif
1188}
1189
1190static inline int
1191xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1192{
1193 switch (family) {
1194 case AF_INET:
1195 return addr->a4 == 0;
1196 case AF_INET6:
1197 return ipv6_addr_any(a: &addr->in6);
1198 }
1199 return 0;
1200}
1201
1202static inline int
1203__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1204{
1205 return (tmpl->saddr.a4 &&
1206 tmpl->saddr.a4 != x->props.saddr.a4);
1207}
1208
1209static inline int
1210__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1211{
1212 return (!ipv6_addr_any(a: (struct in6_addr*)&tmpl->saddr) &&
1213 !ipv6_addr_equal(a1: (struct in6_addr *)&tmpl->saddr, a2: (struct in6_addr*)&x->props.saddr));
1214}
1215
1216static inline int
1217xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1218{
1219 switch (family) {
1220 case AF_INET:
1221 return __xfrm4_state_addr_cmp(tmpl, x);
1222 case AF_INET6:
1223 return __xfrm6_state_addr_cmp(tmpl, x);
1224 }
1225 return !0;
1226}
1227
1228#ifdef CONFIG_XFRM
1229static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1230{
1231 struct sec_path *sp = skb_sec_path(skb);
1232
1233 return sp->xvec[sp->len - 1];
1234}
1235#endif
1236
1237static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1238{
1239#ifdef CONFIG_XFRM
1240 struct sec_path *sp = skb_sec_path(skb);
1241
1242 if (!sp || !sp->olen || sp->len != sp->olen)
1243 return NULL;
1244
1245 return &sp->ovec[sp->olen - 1];
1246#else
1247 return NULL;
1248#endif
1249}
1250
1251#ifdef CONFIG_XFRM
1252int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1253 unsigned short family);
1254
1255static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1256 int dir)
1257{
1258 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1259 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1260
1261 return false;
1262}
1263
1264static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1265 int dir, unsigned short family)
1266{
1267 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1268 /* same dst may be used for traffic originating from
1269 * devices with different policy settings.
1270 */
1271 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1272 }
1273 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1274}
1275
1276static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1277 struct sk_buff *skb,
1278 unsigned int family, int reverse)
1279{
1280 struct net *net = dev_net(dev: skb->dev);
1281 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1282 struct xfrm_offload *xo = xfrm_offload(skb);
1283 struct xfrm_state *x;
1284
1285 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1286 return __xfrm_policy_check(sk, dir: ndir, skb, family);
1287
1288 if (xo) {
1289 x = xfrm_input_state(skb);
1290 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) {
1291 bool check = (xo->flags & CRYPTO_DONE) &&
1292 (xo->status & CRYPTO_SUCCESS);
1293
1294 /* The packets here are plain ones and secpath was
1295 * needed to indicate that hardware already handled
1296 * them and there is no need to do nothing in addition.
1297 *
1298 * Consume secpath which was set by drivers.
1299 */
1300 secpath_reset(skb);
1301 return check;
1302 }
1303 }
1304
1305 return __xfrm_check_nopolicy(net, skb, dir) ||
1306 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1307 __xfrm_policy_check(sk, dir: ndir, skb, family);
1308}
1309
1310static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1311{
1312 return __xfrm_policy_check2(sk, dir, skb, family, reverse: 0);
1313}
1314
1315static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1316{
1317 return xfrm_policy_check(sk, dir, skb, AF_INET);
1318}
1319
1320static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1321{
1322 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1323}
1324
1325static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1326 struct sk_buff *skb)
1327{
1328 return __xfrm_policy_check2(sk, dir, skb, AF_INET, reverse: 1);
1329}
1330
1331static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1332 struct sk_buff *skb)
1333{
1334 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, reverse: 1);
1335}
1336
1337int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1338 unsigned int family, int reverse);
1339
1340static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1341 unsigned int family)
1342{
1343 return __xfrm_decode_session(net, skb, fl, family, reverse: 0);
1344}
1345
1346static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1347 struct flowi *fl,
1348 unsigned int family)
1349{
1350 return __xfrm_decode_session(net, skb, fl, family, reverse: 1);
1351}
1352
1353int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1354
1355static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1356{
1357 struct net *net = dev_net(dev: skb->dev);
1358
1359 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1360 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1361 return true;
1362
1363 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1364 __xfrm_route_forward(skb, family);
1365}
1366
1367static inline int xfrm4_route_forward(struct sk_buff *skb)
1368{
1369 return xfrm_route_forward(skb, AF_INET);
1370}
1371
1372static inline int xfrm6_route_forward(struct sk_buff *skb)
1373{
1374 return xfrm_route_forward(skb, AF_INET6);
1375}
1376
1377int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1378
1379static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1380{
1381 if (!sk_fullsock(sk: osk))
1382 return 0;
1383 sk->sk_policy[0] = NULL;
1384 sk->sk_policy[1] = NULL;
1385 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1386 return __xfrm_sk_clone_policy(sk, osk);
1387 return 0;
1388}
1389
1390int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1391
1392static inline void xfrm_sk_free_policy(struct sock *sk)
1393{
1394 struct xfrm_policy *pol;
1395
1396 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1397 if (unlikely(pol != NULL)) {
1398 xfrm_policy_delete(pol, dir: XFRM_POLICY_MAX);
1399 sk->sk_policy[0] = NULL;
1400 }
1401 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1402 if (unlikely(pol != NULL)) {
1403 xfrm_policy_delete(pol, dir: XFRM_POLICY_MAX+1);
1404 sk->sk_policy[1] = NULL;
1405 }
1406}
1407
1408#else
1409
1410static inline void xfrm_sk_free_policy(struct sock *sk) {}
1411static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1412static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1413static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1414static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1415{
1416 return 1;
1417}
1418static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1419{
1420 return 1;
1421}
1422static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1423{
1424 return 1;
1425}
1426static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1427 struct flowi *fl,
1428 unsigned int family)
1429{
1430 return -ENOSYS;
1431}
1432static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1433 struct sk_buff *skb)
1434{
1435 return 1;
1436}
1437static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1438 struct sk_buff *skb)
1439{
1440 return 1;
1441}
1442#endif
1443
1444static __inline__
1445xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1446{
1447 switch (family){
1448 case AF_INET:
1449 return (xfrm_address_t *)&fl->u.ip4.daddr;
1450 case AF_INET6:
1451 return (xfrm_address_t *)&fl->u.ip6.daddr;
1452 }
1453 return NULL;
1454}
1455
1456static __inline__
1457xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1458{
1459 switch (family){
1460 case AF_INET:
1461 return (xfrm_address_t *)&fl->u.ip4.saddr;
1462 case AF_INET6:
1463 return (xfrm_address_t *)&fl->u.ip6.saddr;
1464 }
1465 return NULL;
1466}
1467
1468static __inline__
1469void xfrm_flowi_addr_get(const struct flowi *fl,
1470 xfrm_address_t *saddr, xfrm_address_t *daddr,
1471 unsigned short family)
1472{
1473 switch(family) {
1474 case AF_INET:
1475 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1476 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1477 break;
1478 case AF_INET6:
1479 saddr->in6 = fl->u.ip6.saddr;
1480 daddr->in6 = fl->u.ip6.daddr;
1481 break;
1482 }
1483}
1484
1485static __inline__ int
1486__xfrm4_state_addr_check(const struct xfrm_state *x,
1487 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1488{
1489 if (daddr->a4 == x->id.daddr.a4 &&
1490 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1491 return 1;
1492 return 0;
1493}
1494
1495static __inline__ int
1496__xfrm6_state_addr_check(const struct xfrm_state *x,
1497 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1498{
1499 if (ipv6_addr_equal(a1: (struct in6_addr *)daddr, a2: (struct in6_addr *)&x->id.daddr) &&
1500 (ipv6_addr_equal(a1: (struct in6_addr *)saddr, a2: (struct in6_addr *)&x->props.saddr) ||
1501 ipv6_addr_any(a: (struct in6_addr *)saddr) ||
1502 ipv6_addr_any(a: (struct in6_addr *)&x->props.saddr)))
1503 return 1;
1504 return 0;
1505}
1506
1507static __inline__ int
1508xfrm_state_addr_check(const struct xfrm_state *x,
1509 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1510 unsigned short family)
1511{
1512 switch (family) {
1513 case AF_INET:
1514 return __xfrm4_state_addr_check(x, daddr, saddr);
1515 case AF_INET6:
1516 return __xfrm6_state_addr_check(x, daddr, saddr);
1517 }
1518 return 0;
1519}
1520
1521static __inline__ int
1522xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1523 unsigned short family)
1524{
1525 switch (family) {
1526 case AF_INET:
1527 return __xfrm4_state_addr_check(x,
1528 daddr: (const xfrm_address_t *)&fl->u.ip4.daddr,
1529 saddr: (const xfrm_address_t *)&fl->u.ip4.saddr);
1530 case AF_INET6:
1531 return __xfrm6_state_addr_check(x,
1532 daddr: (const xfrm_address_t *)&fl->u.ip6.daddr,
1533 saddr: (const xfrm_address_t *)&fl->u.ip6.saddr);
1534 }
1535 return 0;
1536}
1537
1538static inline int xfrm_state_kern(const struct xfrm_state *x)
1539{
1540 return atomic_read(v: &x->tunnel_users);
1541}
1542
1543static inline bool xfrm_id_proto_valid(u8 proto)
1544{
1545 switch (proto) {
1546 case IPPROTO_AH:
1547 case IPPROTO_ESP:
1548 case IPPROTO_COMP:
1549#if IS_ENABLED(CONFIG_IPV6)
1550 case IPPROTO_ROUTING:
1551 case IPPROTO_DSTOPTS:
1552#endif
1553 return true;
1554 default:
1555 return false;
1556 }
1557}
1558
1559/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1560static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1561{
1562 return (!userproto || proto == userproto ||
1563 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1564 proto == IPPROTO_ESP ||
1565 proto == IPPROTO_COMP)));
1566}
1567
1568/*
1569 * xfrm algorithm information
1570 */
1571struct xfrm_algo_aead_info {
1572 char *geniv;
1573 u16 icv_truncbits;
1574};
1575
1576struct xfrm_algo_auth_info {
1577 u16 icv_truncbits;
1578 u16 icv_fullbits;
1579};
1580
1581struct xfrm_algo_encr_info {
1582 char *geniv;
1583 u16 blockbits;
1584 u16 defkeybits;
1585};
1586
1587struct xfrm_algo_comp_info {
1588 u16 threshold;
1589};
1590
1591struct xfrm_algo_desc {
1592 char *name;
1593 char *compat;
1594 u8 available:1;
1595 u8 pfkey_supported:1;
1596 union {
1597 struct xfrm_algo_aead_info aead;
1598 struct xfrm_algo_auth_info auth;
1599 struct xfrm_algo_encr_info encr;
1600 struct xfrm_algo_comp_info comp;
1601 } uinfo;
1602 struct sadb_alg desc;
1603};
1604
1605/* XFRM protocol handlers. */
1606struct xfrm4_protocol {
1607 int (*handler)(struct sk_buff *skb);
1608 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1609 int encap_type);
1610 int (*cb_handler)(struct sk_buff *skb, int err);
1611 int (*err_handler)(struct sk_buff *skb, u32 info);
1612
1613 struct xfrm4_protocol __rcu *next;
1614 int priority;
1615};
1616
1617struct xfrm6_protocol {
1618 int (*handler)(struct sk_buff *skb);
1619 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1620 int encap_type);
1621 int (*cb_handler)(struct sk_buff *skb, int err);
1622 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1623 u8 type, u8 code, int offset, __be32 info);
1624
1625 struct xfrm6_protocol __rcu *next;
1626 int priority;
1627};
1628
1629/* XFRM tunnel handlers. */
1630struct xfrm_tunnel {
1631 int (*handler)(struct sk_buff *skb);
1632 int (*cb_handler)(struct sk_buff *skb, int err);
1633 int (*err_handler)(struct sk_buff *skb, u32 info);
1634
1635 struct xfrm_tunnel __rcu *next;
1636 int priority;
1637};
1638
1639struct xfrm6_tunnel {
1640 int (*handler)(struct sk_buff *skb);
1641 int (*cb_handler)(struct sk_buff *skb, int err);
1642 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1643 u8 type, u8 code, int offset, __be32 info);
1644 struct xfrm6_tunnel __rcu *next;
1645 int priority;
1646};
1647
1648void xfrm_init(void);
1649void xfrm4_init(void);
1650int xfrm_state_init(struct net *net);
1651void xfrm_state_fini(struct net *net);
1652void xfrm4_state_init(void);
1653void xfrm4_protocol_init(void);
1654#ifdef CONFIG_XFRM
1655int xfrm6_init(void);
1656void xfrm6_fini(void);
1657int xfrm6_state_init(void);
1658void xfrm6_state_fini(void);
1659int xfrm6_protocol_init(void);
1660void xfrm6_protocol_fini(void);
1661#else
1662static inline int xfrm6_init(void)
1663{
1664 return 0;
1665}
1666static inline void xfrm6_fini(void)
1667{
1668 ;
1669}
1670#endif
1671
1672#ifdef CONFIG_XFRM_STATISTICS
1673int xfrm_proc_init(struct net *net);
1674void xfrm_proc_fini(struct net *net);
1675#endif
1676
1677int xfrm_sysctl_init(struct net *net);
1678#ifdef CONFIG_SYSCTL
1679void xfrm_sysctl_fini(struct net *net);
1680#else
1681static inline void xfrm_sysctl_fini(struct net *net)
1682{
1683}
1684#endif
1685
1686void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1687 struct xfrm_address_filter *filter);
1688int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1689 int (*func)(struct xfrm_state *, int, void*), void *);
1690void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1691struct xfrm_state *xfrm_state_alloc(struct net *net);
1692void xfrm_state_free(struct xfrm_state *x);
1693struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1694 const xfrm_address_t *saddr,
1695 const struct flowi *fl,
1696 struct xfrm_tmpl *tmpl,
1697 struct xfrm_policy *pol, int *err,
1698 unsigned short family, u32 if_id);
1699struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1700 xfrm_address_t *daddr,
1701 xfrm_address_t *saddr,
1702 unsigned short family,
1703 u8 mode, u8 proto, u32 reqid);
1704struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1705 unsigned short family);
1706int xfrm_state_check_expire(struct xfrm_state *x);
1707void xfrm_state_update_stats(struct net *net);
1708#ifdef CONFIG_XFRM_OFFLOAD
1709static inline void xfrm_dev_state_update_stats(struct xfrm_state *x)
1710{
1711 struct xfrm_dev_offload *xdo = &x->xso;
1712 struct net_device *dev = READ_ONCE(xdo->dev);
1713
1714 if (dev && dev->xfrmdev_ops &&
1715 dev->xfrmdev_ops->xdo_dev_state_update_stats)
1716 dev->xfrmdev_ops->xdo_dev_state_update_stats(x);
1717
1718}
1719#else
1720static inline void xfrm_dev_state_update_stats(struct xfrm_state *x) {}
1721#endif
1722void xfrm_state_insert(struct xfrm_state *x);
1723int xfrm_state_add(struct xfrm_state *x);
1724int xfrm_state_update(struct xfrm_state *x);
1725struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1726 const xfrm_address_t *daddr, __be32 spi,
1727 u8 proto, unsigned short family);
1728struct xfrm_state *xfrm_input_state_lookup(struct net *net, u32 mark,
1729 const xfrm_address_t *daddr,
1730 __be32 spi, u8 proto,
1731 unsigned short family);
1732struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1733 const xfrm_address_t *daddr,
1734 const xfrm_address_t *saddr,
1735 u8 proto,
1736 unsigned short family);
1737#ifdef CONFIG_XFRM_SUB_POLICY
1738void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1739 unsigned short family);
1740void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1741 unsigned short family);
1742#else
1743static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1744 int n, unsigned short family)
1745{
1746}
1747
1748static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1749 int n, unsigned short family)
1750{
1751}
1752#endif
1753
1754struct xfrmk_sadinfo {
1755 u32 sadhcnt; /* current hash bkts */
1756 u32 sadhmcnt; /* max allowed hash bkts */
1757 u32 sadcnt; /* current running count */
1758};
1759
1760struct xfrmk_spdinfo {
1761 u32 incnt;
1762 u32 outcnt;
1763 u32 fwdcnt;
1764 u32 inscnt;
1765 u32 outscnt;
1766 u32 fwdscnt;
1767 u32 spdhcnt;
1768 u32 spdhmcnt;
1769};
1770
1771struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num);
1772int xfrm_state_delete(struct xfrm_state *x);
1773int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1774int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1775int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1776 bool task_valid);
1777void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1778void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1779u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1780int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1781u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1782int __xfrm_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack);
1783int xfrm_init_state(struct xfrm_state *x);
1784int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1785int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1786int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1787 int (*finish)(struct net *, struct sock *,
1788 struct sk_buff *));
1789int xfrm_trans_queue(struct sk_buff *skb,
1790 int (*finish)(struct net *, struct sock *,
1791 struct sk_buff *));
1792int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1793int xfrm_output(struct sock *sk, struct sk_buff *skb);
1794int xfrm4_tunnel_check_size(struct sk_buff *skb);
1795#if IS_ENABLED(CONFIG_IPV6)
1796int xfrm6_tunnel_check_size(struct sk_buff *skb);
1797#else
1798static inline int xfrm6_tunnel_check_size(struct sk_buff *skb)
1799{
1800 return -EMSGSIZE;
1801}
1802#endif
1803
1804#if IS_ENABLED(CONFIG_NET_PKTGEN)
1805int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1806#endif
1807
1808void xfrm_local_error(struct sk_buff *skb, int mtu);
1809int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1810 int encap_type);
1811int xfrm4_transport_finish(struct sk_buff *skb, int async);
1812int xfrm4_rcv(struct sk_buff *skb);
1813
1814static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1815{
1816 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1817 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1818 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1819 return xfrm_input(skb, nexthdr, spi, encap_type: 0);
1820}
1821
1822int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1823int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1824int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1825int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1826int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1827void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1828int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1829 struct ip6_tnl *t);
1830int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1831 int encap_type);
1832int xfrm6_transport_finish(struct sk_buff *skb, int async);
1833int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1834int xfrm6_rcv(struct sk_buff *skb);
1835int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1836 xfrm_address_t *saddr, u8 proto);
1837void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1838int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1839int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1840int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1841int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1842__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1843__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1844int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1845
1846#ifdef CONFIG_XFRM
1847void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1848int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1849int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1850struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1851 struct sk_buff *skb);
1852struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1853 struct sk_buff *skb);
1854int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1855 int optlen);
1856#else
1857static inline int xfrm_user_policy(struct sock *sk, int optname,
1858 sockptr_t optval, int optlen)
1859{
1860 return -ENOPROTOOPT;
1861}
1862#endif
1863
1864struct dst_entry *__xfrm_dst_lookup(int family, const struct xfrm_dst_lookup_params *params);
1865
1866struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1867
1868void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1869int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1870 int (*func)(struct xfrm_policy *, int, int, void*),
1871 void *);
1872void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1873int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1874struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1875 const struct xfrm_mark *mark,
1876 u32 if_id, u8 type, int dir,
1877 struct xfrm_selector *sel,
1878 struct xfrm_sec_ctx *ctx, int delete,
1879 int *err);
1880struct xfrm_policy *xfrm_policy_byid(struct net *net,
1881 const struct xfrm_mark *mark, u32 if_id,
1882 u8 type, int dir, u32 id, int delete,
1883 int *err);
1884int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1885void xfrm_policy_hash_rebuild(struct net *net);
1886u32 xfrm_get_acqseq(void);
1887int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1888int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1889 struct netlink_ext_ack *extack);
1890struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1891 u8 mode, u32 reqid, u32 if_id, u32 pcpu_num, u8 proto,
1892 const xfrm_address_t *daddr,
1893 const xfrm_address_t *saddr, int create,
1894 unsigned short family);
1895int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1896
1897#ifdef CONFIG_XFRM_MIGRATE
1898int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1899 const struct xfrm_migrate *m, int num_bundles,
1900 const struct xfrm_kmaddress *k,
1901 const struct xfrm_encap_tmpl *encap);
1902struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1903 u32 if_id);
1904struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1905 struct xfrm_migrate *m,
1906 struct xfrm_encap_tmpl *encap,
1907 struct net *net,
1908 struct xfrm_user_offload *xuo,
1909 struct netlink_ext_ack *extack);
1910int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1911 struct xfrm_migrate *m, int num_bundles,
1912 struct xfrm_kmaddress *k, struct net *net,
1913 struct xfrm_encap_tmpl *encap, u32 if_id,
1914 struct netlink_ext_ack *extack,
1915 struct xfrm_user_offload *xuo);
1916#endif
1917
1918int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1919void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1920int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1921 xfrm_address_t *addr);
1922
1923void xfrm_input_init(void);
1924int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1925
1926void xfrm_probe_algs(void);
1927int xfrm_count_pfkey_auth_supported(void);
1928int xfrm_count_pfkey_enc_supported(void);
1929struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1930struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1931struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1932struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1933struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1934struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1935struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1936struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1937struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1938 int probe);
1939
1940static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1941 const xfrm_address_t *b)
1942{
1943 return ipv6_addr_equal(a1: (const struct in6_addr *)a,
1944 a2: (const struct in6_addr *)b);
1945}
1946
1947static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1948 const xfrm_address_t *b,
1949 sa_family_t family)
1950{
1951 switch (family) {
1952 default:
1953 case AF_INET:
1954 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1955 case AF_INET6:
1956 return xfrm6_addr_equal(a, b);
1957 }
1958}
1959
1960static inline int xfrm_policy_id2dir(u32 index)
1961{
1962 return index & 7;
1963}
1964
1965#ifdef CONFIG_XFRM
1966void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1967int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1968void xfrm_replay_notify(struct xfrm_state *x, int event);
1969int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1970int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1971
1972static inline int xfrm_aevent_is_on(struct net *net)
1973{
1974 struct sock *nlsk;
1975 int ret = 0;
1976
1977 rcu_read_lock();
1978 nlsk = rcu_dereference(net->xfrm.nlsk);
1979 if (nlsk)
1980 ret = netlink_has_listeners(sk: nlsk, XFRMNLGRP_AEVENTS);
1981 rcu_read_unlock();
1982 return ret;
1983}
1984
1985static inline int xfrm_acquire_is_on(struct net *net)
1986{
1987 struct sock *nlsk;
1988 int ret = 0;
1989
1990 rcu_read_lock();
1991 nlsk = rcu_dereference(net->xfrm.nlsk);
1992 if (nlsk)
1993 ret = netlink_has_listeners(sk: nlsk, XFRMNLGRP_ACQUIRE);
1994 rcu_read_unlock();
1995
1996 return ret;
1997}
1998#endif
1999
2000static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
2001{
2002 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
2003}
2004
2005static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
2006{
2007 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
2008}
2009
2010static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
2011{
2012 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
2013}
2014
2015static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
2016{
2017 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
2018}
2019
2020#ifdef CONFIG_XFRM_MIGRATE
2021static inline int xfrm_replay_clone(struct xfrm_state *x,
2022 struct xfrm_state *orig)
2023{
2024
2025 x->replay_esn = kmemdup(orig->replay_esn,
2026 xfrm_replay_state_esn_len(orig->replay_esn),
2027 GFP_KERNEL);
2028 if (!x->replay_esn)
2029 return -ENOMEM;
2030 x->preplay_esn = kmemdup(orig->preplay_esn,
2031 xfrm_replay_state_esn_len(orig->preplay_esn),
2032 GFP_KERNEL);
2033 if (!x->preplay_esn)
2034 return -ENOMEM;
2035
2036 return 0;
2037}
2038
2039static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
2040{
2041 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
2042}
2043
2044
2045static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
2046{
2047 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
2048}
2049
2050static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
2051{
2052 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
2053}
2054
2055static inline void xfrm_states_put(struct xfrm_state **states, int n)
2056{
2057 int i;
2058 for (i = 0; i < n; i++)
2059 xfrm_state_put(x: *(states + i));
2060}
2061
2062static inline void xfrm_states_delete(struct xfrm_state **states, int n)
2063{
2064 int i;
2065 for (i = 0; i < n; i++)
2066 xfrm_state_delete(x: *(states + i));
2067}
2068#endif
2069
2070void __init xfrm_dev_init(void);
2071
2072#ifdef CONFIG_XFRM_OFFLOAD
2073void xfrm_dev_resume(struct sk_buff *skb);
2074void xfrm_dev_backlog(struct softnet_data *sd);
2075struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
2076int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
2077 struct xfrm_user_offload *xuo,
2078 struct netlink_ext_ack *extack);
2079int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2080 struct xfrm_user_offload *xuo, u8 dir,
2081 struct netlink_ext_ack *extack);
2082bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
2083void xfrm_dev_state_delete(struct xfrm_state *x);
2084void xfrm_dev_state_free(struct xfrm_state *x);
2085
2086static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2087{
2088 struct xfrm_dev_offload *xso = &x->xso;
2089 struct net_device *dev = READ_ONCE(xso->dev);
2090
2091 if (dev && dev->xfrmdev_ops->xdo_dev_state_advance_esn)
2092 dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
2093}
2094
2095static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2096{
2097 struct xfrm_state *x = dst->xfrm;
2098 struct xfrm_dst *xdst;
2099
2100 if (!x || !x->type_offload)
2101 return false;
2102
2103 xdst = (struct xfrm_dst *) dst;
2104 if (!x->xso.offload_handle && !xdst->child->xfrm)
2105 return true;
2106 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
2107 !xdst->child->xfrm)
2108 return true;
2109
2110 return false;
2111}
2112
2113static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2114{
2115 struct xfrm_dev_offload *xdo = &x->xdo;
2116 struct net_device *dev = xdo->dev;
2117
2118 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
2119 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
2120}
2121
2122static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2123{
2124 struct xfrm_dev_offload *xdo = &x->xdo;
2125 struct net_device *dev = xdo->dev;
2126
2127 if (dev && dev->xfrmdev_ops) {
2128 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2129 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2130 xdo->dev = NULL;
2131 netdev_put(dev, tracker: &xdo->dev_tracker);
2132 }
2133}
2134#else
2135static inline void xfrm_dev_resume(struct sk_buff *skb)
2136{
2137}
2138
2139static inline void xfrm_dev_backlog(struct softnet_data *sd)
2140{
2141}
2142
2143static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2144{
2145 return skb;
2146}
2147
2148static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2149{
2150 return 0;
2151}
2152
2153static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2154{
2155}
2156
2157static inline void xfrm_dev_state_free(struct xfrm_state *x)
2158{
2159}
2160
2161static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2162 struct xfrm_user_offload *xuo, u8 dir,
2163 struct netlink_ext_ack *extack)
2164{
2165 return 0;
2166}
2167
2168static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2169{
2170}
2171
2172static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2173{
2174}
2175
2176static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2177{
2178 return false;
2179}
2180
2181static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2182{
2183}
2184
2185static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2186{
2187 return false;
2188}
2189#endif
2190
2191static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2192{
2193 if (attrs[XFRMA_MARK])
2194 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2195 else
2196 m->v = m->m = 0;
2197
2198 return m->v & m->m;
2199}
2200
2201static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2202{
2203 int ret = 0;
2204
2205 if (m->m | m->v)
2206 ret = nla_put(skb, attrtype: XFRMA_MARK, attrlen: sizeof(struct xfrm_mark), data: m);
2207 return ret;
2208}
2209
2210static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2211{
2212 struct xfrm_mark *m = &x->props.smark;
2213
2214 return (m->v & m->m) | (mark & ~m->m);
2215}
2216
2217static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2218{
2219 int ret = 0;
2220
2221 if (if_id)
2222 ret = nla_put_u32(skb, attrtype: XFRMA_IF_ID, value: if_id);
2223 return ret;
2224}
2225
2226static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2227 unsigned int family)
2228{
2229 bool tunnel = false;
2230
2231 switch(family) {
2232 case AF_INET:
2233 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2234 tunnel = true;
2235 break;
2236 case AF_INET6:
2237 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2238 tunnel = true;
2239 break;
2240 }
2241 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2242 return -EINVAL;
2243
2244 return 0;
2245}
2246
2247extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2248extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2249
2250struct xfrm_translator {
2251 /* Allocate frag_list and put compat translation there */
2252 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2253
2254 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2255 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2256 int maxtype, const struct nla_policy *policy,
2257 struct netlink_ext_ack *extack);
2258
2259 /* Translate 32-bit user_policy from sockptr */
2260 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2261
2262 struct module *owner;
2263};
2264
2265#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2266extern int xfrm_register_translator(struct xfrm_translator *xtr);
2267extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2268extern struct xfrm_translator *xfrm_get_translator(void);
2269extern void xfrm_put_translator(struct xfrm_translator *xtr);
2270#else
2271static inline struct xfrm_translator *xfrm_get_translator(void)
2272{
2273 return NULL;
2274}
2275static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2276{
2277}
2278#endif
2279
2280#if IS_ENABLED(CONFIG_IPV6)
2281static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2282{
2283 int proto;
2284
2285 if (!sk || sk->sk_family != AF_INET6)
2286 return false;
2287
2288 proto = sk->sk_protocol;
2289 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2290 return inet6_test_bit(DONTFRAG, sk);
2291
2292 return false;
2293}
2294#endif
2295
2296#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2297 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2298
2299extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2300
2301int register_xfrm_interface_bpf(void);
2302
2303#else
2304
2305static inline int register_xfrm_interface_bpf(void)
2306{
2307 return 0;
2308}
2309
2310#endif
2311
2312#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF)
2313int register_xfrm_state_bpf(void);
2314#else
2315static inline int register_xfrm_state_bpf(void)
2316{
2317 return 0;
2318}
2319#endif
2320
2321int xfrm_nat_keepalive_init(unsigned short family);
2322void xfrm_nat_keepalive_fini(unsigned short family);
2323int xfrm_nat_keepalive_net_init(struct net *net);
2324int xfrm_nat_keepalive_net_fini(struct net *net);
2325void xfrm_nat_keepalive_state_updated(struct xfrm_state *x);
2326
2327#endif /* _NET_XFRM_H */
2328

source code of linux/include/net/xfrm.h