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TOMOYO Linux Cross Reference
Linux/include/net/xfrm.h

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

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