1 /* SPDX-License-Identifier: GPL-2.0 */
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>
23 #include <net/route.h>
25 #include <net/ip6_fib.h>
27 #include <net/gro_cells.h>
29 #include <linux/interrupt.h>
31 #ifdef CONFIG_XFRM_STATISTICS
35 #define XFRM_PROTO_ESP 50
36 #define XFRM_PROTO_AH 51
37 #define XFRM_PROTO_COMP 108
38 #define XFRM_PROTO_IPIP 4
39 #define XFRM_PROTO_IPV6 41
40 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
41 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
43 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
44 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
45 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
52 #ifdef CONFIG_XFRM_STATISTICS
53 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
55 #define XFRM_INC_STATS(net, field) ((void)(net))
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
73 Lookup is plain linear search until the first match with selector.
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 Bundles are cached at xrfm_policy struct (field ->bundles).
90 Resolution of xrfm_tmpl
91 -----------------------
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 struct xfrm_state_walk {
121 struct list_head all;
126 struct xfrm_address_filter *filter;
129 struct xfrm_state_offload {
130 struct net_device *dev;
131 struct net_device *real_dev;
132 unsigned long offload_handle;
133 unsigned int num_exthdrs;
143 /* Flags for xfrm_mode. */
145 XFRM_MODE_FLAG_TUNNEL = 1,
148 /* Full description of state of transformer. */
150 possible_net_t xs_net;
152 struct hlist_node gclist;
153 struct hlist_node bydst;
155 struct hlist_node bysrc;
156 struct hlist_node byspi;
162 struct xfrm_selector sel;
163 struct xfrm_mark mark;
169 /* Key manager bits */
170 struct xfrm_state_walk km;
172 /* Parameters of this state. */
177 u8 aalgo, ealgo, calgo;
180 xfrm_address_t saddr;
184 struct xfrm_mark smark;
187 struct xfrm_lifetime_cfg lft;
189 /* Data for transformer */
190 struct xfrm_algo_auth *aalg;
191 struct xfrm_algo *ealg;
192 struct xfrm_algo *calg;
193 struct xfrm_algo_aead *aead;
196 /* mapping change rate limiting */
197 __be16 new_mapping_sport;
198 u32 new_mapping; /* seconds */
199 u32 mapping_maxage; /* seconds for input SA */
201 /* Data for encapsulator */
202 struct xfrm_encap_tmpl *encap;
203 struct sock __rcu *encap_sk;
205 /* Data for care-of address */
206 xfrm_address_t *coaddr;
208 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
209 struct xfrm_state *tunnel;
211 /* If a tunnel, number of users + 1 */
212 atomic_t tunnel_users;
214 /* State for replay detection */
215 struct xfrm_replay_state replay;
216 struct xfrm_replay_state_esn *replay_esn;
218 /* Replay detection state at the time we sent the last notification */
219 struct xfrm_replay_state preplay;
220 struct xfrm_replay_state_esn *preplay_esn;
222 /* The functions for replay detection. */
223 const struct xfrm_replay *repl;
225 /* internal flag that only holds state for delayed aevent at the
230 /* Replay detection notification settings */
234 /* Replay detection notification timer */
235 struct timer_list rtimer;
238 struct xfrm_stats stats;
240 struct xfrm_lifetime_cur curlft;
241 struct hrtimer mtimer;
243 struct xfrm_state_offload xso;
245 /* used to fix curlft->add_time when changing date */
251 struct page_frag xfrag;
253 /* Reference to data common to all the instances of this
255 const struct xfrm_type *type;
256 struct xfrm_mode inner_mode;
257 struct xfrm_mode inner_mode_iaf;
258 struct xfrm_mode outer_mode;
260 const struct xfrm_type_offload *type_offload;
262 /* Security context */
263 struct xfrm_sec_ctx *security;
265 /* Private data of this transformer, format is opaque,
266 * interpreted by xfrm_type methods. */
270 static inline struct net *xs_net(struct xfrm_state *x)
272 return read_pnet(&x->xs_net);
275 /* xflags - make enum if more show up */
276 #define XFRM_TIME_DEFER 1
277 #define XFRM_SOFT_EXPIRE 2
288 /* callback structure passed from either netlink or pfkey */
305 void (*advance)(struct xfrm_state *x, __be32 net_seq);
306 int (*check)(struct xfrm_state *x,
309 int (*recheck)(struct xfrm_state *x,
312 void (*notify)(struct xfrm_state *x, int event);
313 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
317 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
318 unsigned short family);
321 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
322 void xfrm_if_unregister_cb(void);
327 struct xfrm_policy_afinfo {
328 struct dst_ops *dst_ops;
329 struct dst_entry *(*dst_lookup)(struct net *net,
331 const xfrm_address_t *saddr,
332 const xfrm_address_t *daddr,
334 int (*get_saddr)(struct net *net, int oif,
335 xfrm_address_t *saddr,
336 xfrm_address_t *daddr,
338 int (*fill_dst)(struct xfrm_dst *xdst,
339 struct net_device *dev,
340 const struct flowi *fl);
341 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
344 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
345 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
346 void km_policy_notify(struct xfrm_policy *xp, int dir,
347 const struct km_event *c);
348 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
351 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
352 struct xfrm_policy *pol);
353 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
354 int __xfrm_state_delete(struct xfrm_state *x);
356 struct xfrm_state_afinfo {
360 const struct xfrm_type_offload *type_offload_esp;
362 const struct xfrm_type *type_esp;
363 const struct xfrm_type *type_ipip;
364 const struct xfrm_type *type_ipip6;
365 const struct xfrm_type *type_comp;
366 const struct xfrm_type *type_ah;
367 const struct xfrm_type *type_routing;
368 const struct xfrm_type *type_dstopts;
370 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
371 int (*transport_finish)(struct sk_buff *skb,
373 void (*local_error)(struct sk_buff *skb, u32 mtu);
376 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
377 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
378 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
379 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
381 struct xfrm_input_afinfo {
384 int (*callback)(struct sk_buff *skb, u8 protocol,
388 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
389 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
391 void xfrm_flush_gc(void);
392 void xfrm_state_delete_tunnel(struct xfrm_state *x);
396 struct module *owner;
399 #define XFRM_TYPE_NON_FRAGMENT 1
400 #define XFRM_TYPE_REPLAY_PROT 2
401 #define XFRM_TYPE_LOCAL_COADDR 4
402 #define XFRM_TYPE_REMOTE_COADDR 8
404 int (*init_state)(struct xfrm_state *x);
405 void (*destructor)(struct xfrm_state *);
406 int (*input)(struct xfrm_state *, struct sk_buff *skb);
407 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
408 int (*reject)(struct xfrm_state *, struct sk_buff *,
409 const struct flowi *);
410 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
413 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
414 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
416 struct xfrm_type_offload {
418 struct module *owner;
420 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
421 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
422 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
425 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
426 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
428 static inline int xfrm_af2proto(unsigned int family)
440 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
442 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
443 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
444 return &x->inner_mode;
446 return &x->inner_mode_iaf;
450 /* id in template is interpreted as:
451 * daddr - destination of tunnel, may be zero for transport mode.
452 * spi - zero to acquire spi. Not zero if spi is static, then
453 * daddr must be fixed too.
454 * proto - AH/ESP/IPCOMP
458 /* Source address of tunnel. Ignored, if it is not a tunnel. */
459 xfrm_address_t saddr;
461 unsigned short encap_family;
465 /* Mode: transport, tunnel etc. */
468 /* Sharing mode: unique, this session only, this user only etc. */
471 /* May skip this transfomration if no SA is found */
474 /* Skip aalgos/ealgos/calgos checks. */
477 /* Bit mask of algos allowed for acquisition */
483 #define XFRM_MAX_DEPTH 6
484 #define XFRM_MAX_OFFLOAD_DEPTH 1
486 struct xfrm_policy_walk_entry {
487 struct list_head all;
491 struct xfrm_policy_walk {
492 struct xfrm_policy_walk_entry walk;
497 struct xfrm_policy_queue {
498 struct sk_buff_head hold_queue;
499 struct timer_list hold_timer;
500 unsigned long timeout;
504 possible_net_t xp_net;
505 struct hlist_node bydst;
506 struct hlist_node byidx;
508 /* This lock only affects elements except for entry. */
512 struct timer_list timer;
518 struct xfrm_mark mark;
519 struct xfrm_selector selector;
520 struct xfrm_lifetime_cfg lft;
521 struct xfrm_lifetime_cur curlft;
522 struct xfrm_policy_walk_entry walk;
523 struct xfrm_policy_queue polq;
530 struct xfrm_sec_ctx *security;
531 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
532 struct hlist_node bydst_inexact_list;
536 static inline struct net *xp_net(const struct xfrm_policy *xp)
538 return read_pnet(&xp->xp_net);
541 struct xfrm_kmaddress {
542 xfrm_address_t local;
543 xfrm_address_t remote;
548 struct xfrm_migrate {
549 xfrm_address_t old_daddr;
550 xfrm_address_t old_saddr;
551 xfrm_address_t new_daddr;
552 xfrm_address_t new_saddr;
561 #define XFRM_KM_TIMEOUT 30
563 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
564 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
566 /* default aevent timeout in units of 100ms */
567 #define XFRM_AE_ETIME 10
568 /* Async Event timer multiplier */
569 #define XFRM_AE_ETH_M 10
570 /* default seq threshold size */
571 #define XFRM_AE_SEQT_SIZE 2
574 struct list_head list;
575 int (*notify)(struct xfrm_state *x, const struct km_event *c);
576 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
577 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
578 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
579 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
580 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
581 int (*migrate)(const struct xfrm_selector *sel,
583 const struct xfrm_migrate *m,
585 const struct xfrm_kmaddress *k,
586 const struct xfrm_encap_tmpl *encap);
587 bool (*is_alive)(const struct km_event *c);
590 int xfrm_register_km(struct xfrm_mgr *km);
591 int xfrm_unregister_km(struct xfrm_mgr *km);
593 struct xfrm_tunnel_skb_cb {
595 struct inet_skb_parm h4;
596 struct inet6_skb_parm h6;
600 struct ip_tunnel *ip4;
605 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
608 * This structure is used for the duration where packets are being
609 * transformed by IPsec. As soon as the packet leaves IPsec the
610 * area beyond the generic IP part may be overwritten.
613 struct xfrm_tunnel_skb_cb header;
615 /* Sequence number for replay protection. */
628 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
631 * This structure is used by the afinfo prepare_input/prepare_output functions
632 * to transmit header information to the mode input/output functions.
634 struct xfrm_mode_skb_cb {
635 struct xfrm_tunnel_skb_cb header;
637 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
641 /* IP header length (excluding options or extension headers). */
644 /* TOS for IPv4, class for IPv6. */
647 /* TTL for IPv4, hop limitfor IPv6. */
650 /* Protocol for IPv4, NH for IPv6. */
653 /* Option length for IPv4, zero for IPv6. */
656 /* Used by IPv6 only, zero for IPv4. */
660 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
663 * This structure is used by the input processing to locate the SPI and
664 * related information.
666 struct xfrm_spi_skb_cb {
667 struct xfrm_tunnel_skb_cb header;
669 unsigned int daddroff;
674 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
676 #ifdef CONFIG_AUDITSYSCALL
677 static inline struct audit_buffer *xfrm_audit_start(const char *op)
679 struct audit_buffer *audit_buf = NULL;
681 if (audit_enabled == AUDIT_OFF)
683 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
684 AUDIT_MAC_IPSEC_EVENT);
685 if (audit_buf == NULL)
687 audit_log_format(audit_buf, "op=%s", op);
691 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
692 struct audit_buffer *audit_buf)
694 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
695 audit_get_loginuid(current) :
697 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
700 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
701 audit_log_task_context(audit_buf);
704 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
705 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
707 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
708 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
709 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
710 struct sk_buff *skb);
711 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
713 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
714 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
716 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
720 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
725 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
730 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
735 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
740 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
745 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
746 struct sk_buff *skb, __be32 net_seq)
750 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
755 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
756 __be32 net_spi, __be32 net_seq)
760 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
761 struct sk_buff *skb, u8 proto)
764 #endif /* CONFIG_AUDITSYSCALL */
766 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
768 if (likely(policy != NULL))
769 refcount_inc(&policy->refcnt);
772 void xfrm_policy_destroy(struct xfrm_policy *policy);
774 static inline void xfrm_pol_put(struct xfrm_policy *policy)
776 if (refcount_dec_and_test(&policy->refcnt))
777 xfrm_policy_destroy(policy);
780 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
783 for (i = npols - 1; i >= 0; --i)
784 xfrm_pol_put(pols[i]);
787 void __xfrm_state_destroy(struct xfrm_state *, bool);
789 static inline void __xfrm_state_put(struct xfrm_state *x)
791 refcount_dec(&x->refcnt);
794 static inline void xfrm_state_put(struct xfrm_state *x)
796 if (refcount_dec_and_test(&x->refcnt))
797 __xfrm_state_destroy(x, false);
800 static inline void xfrm_state_put_sync(struct xfrm_state *x)
802 if (refcount_dec_and_test(&x->refcnt))
803 __xfrm_state_destroy(x, true);
806 static inline void xfrm_state_hold(struct xfrm_state *x)
808 refcount_inc(&x->refcnt);
811 static inline bool addr_match(const void *token1, const void *token2,
812 unsigned int prefixlen)
814 const __be32 *a1 = token1;
815 const __be32 *a2 = token2;
819 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
820 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
823 if (memcmp(a1, a2, pdw << 2))
829 mask = htonl((0xffffffff) << (32 - pbi));
831 if ((a1[pdw] ^ a2[pdw]) & mask)
838 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
840 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
841 if (sizeof(long) == 4 && prefixlen == 0)
843 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
847 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
850 switch(fl->flowi_proto) {
853 case IPPROTO_UDPLITE:
855 port = uli->ports.sport;
859 port = htons(uli->icmpt.type);
862 port = htons(uli->mht.type);
865 port = htons(ntohl(uli->gre_key) >> 16);
874 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
877 switch(fl->flowi_proto) {
880 case IPPROTO_UDPLITE:
882 port = uli->ports.dport;
886 port = htons(uli->icmpt.code);
889 port = htons(ntohl(uli->gre_key) & 0xffff);
897 bool xfrm_selector_match(const struct xfrm_selector *sel,
898 const struct flowi *fl, unsigned short family);
900 #ifdef CONFIG_SECURITY_NETWORK_XFRM
901 /* If neither has a context --> match
902 * Otherwise, both must have a context and the sids, doi, alg must match
904 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
906 return ((!s1 && !s2) ||
908 (s1->ctx_sid == s2->ctx_sid) &&
909 (s1->ctx_doi == s2->ctx_doi) &&
910 (s1->ctx_alg == s2->ctx_alg)));
913 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
919 /* A struct encoding bundle of transformations to apply to some set of flow.
921 * xdst->child points to the next element of bundle.
922 * dst->xfrm points to an instanse of transformer.
924 * Due to unfortunate limitations of current routing cache, which we
925 * have no time to fix, it mirrors struct rtable and bound to the same
926 * routing key, including saddr,daddr. However, we can have many of
927 * bundles differing by session id. All the bundles grow from a parent
932 struct dst_entry dst;
936 struct dst_entry *route;
937 struct dst_entry *child;
938 struct dst_entry *path;
939 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
940 int num_pols, num_xfrms;
943 u32 route_mtu_cached;
944 u32 child_mtu_cached;
949 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
952 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
953 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
958 return (struct dst_entry *) dst;
961 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
964 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
965 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
973 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
978 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
980 xfrm_pols_put(xdst->pols, xdst->num_pols);
981 dst_release(xdst->route);
982 if (likely(xdst->u.dst.xfrm))
983 xfrm_state_put(xdst->u.dst.xfrm);
987 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
989 struct xfrm_if_parms {
990 int link; /* ifindex of underlying L2 interface */
991 u32 if_id; /* interface identifyer */
995 struct xfrm_if __rcu *next; /* next interface in list */
996 struct net_device *dev; /* virtual device associated with interface */
997 struct net *net; /* netns for packet i/o */
998 struct xfrm_if_parms p; /* interface parms */
1000 struct gro_cells gro_cells;
1003 struct xfrm_offload {
1004 /* Output sequence number for replay protection on offloading. */
1011 #define SA_DELETE_REQ 1
1012 #define CRYPTO_DONE 2
1013 #define CRYPTO_NEXT_DONE 4
1014 #define CRYPTO_FALLBACK 8
1015 #define XFRM_GSO_SEGMENT 16
1017 #define XFRM_ESP_NO_TRAILER 64
1018 #define XFRM_DEV_RESUME 128
1019 #define XFRM_XMIT 256
1022 #define CRYPTO_SUCCESS 1
1023 #define CRYPTO_GENERIC_ERROR 2
1024 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1025 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1026 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1027 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1028 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1029 #define CRYPTO_INVALID_PROTOCOL 128
1031 /* Used to keep whole l2 header for transport mode GRO */
1042 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1043 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1046 struct sec_path *secpath_set(struct sk_buff *skb);
1049 secpath_reset(struct sk_buff *skb)
1052 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1057 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1061 return addr->a4 == 0;
1063 return ipv6_addr_any(&addr->in6);
1069 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1071 return (tmpl->saddr.a4 &&
1072 tmpl->saddr.a4 != x->props.saddr.a4);
1076 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1078 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1079 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1083 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1087 return __xfrm4_state_addr_cmp(tmpl, x);
1089 return __xfrm6_state_addr_cmp(tmpl, x);
1095 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1096 unsigned short family);
1098 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1101 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1102 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1107 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1108 int dir, unsigned short family)
1110 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1111 /* same dst may be used for traffic originating from
1112 * devices with different policy settings.
1114 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1116 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1119 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1120 struct sk_buff *skb,
1121 unsigned int family, int reverse)
1123 struct net *net = dev_net(skb->dev);
1124 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1126 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1127 return __xfrm_policy_check(sk, ndir, skb, family);
1129 return __xfrm_check_nopolicy(net, skb, dir) ||
1130 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1131 __xfrm_policy_check(sk, ndir, skb, family);
1134 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1136 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1139 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1141 return xfrm_policy_check(sk, dir, skb, AF_INET);
1144 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1146 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1149 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1150 struct sk_buff *skb)
1152 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1155 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1156 struct sk_buff *skb)
1158 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1161 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1162 unsigned int family, int reverse);
1164 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1165 unsigned int family)
1167 return __xfrm_decode_session(skb, fl, family, 0);
1170 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1172 unsigned int family)
1174 return __xfrm_decode_session(skb, fl, family, 1);
1177 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1179 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1181 struct net *net = dev_net(skb->dev);
1183 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1184 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1187 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1188 __xfrm_route_forward(skb, family);
1191 static inline int xfrm4_route_forward(struct sk_buff *skb)
1193 return xfrm_route_forward(skb, AF_INET);
1196 static inline int xfrm6_route_forward(struct sk_buff *skb)
1198 return xfrm_route_forward(skb, AF_INET6);
1201 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1203 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1205 if (!sk_fullsock(osk))
1207 sk->sk_policy[0] = NULL;
1208 sk->sk_policy[1] = NULL;
1209 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1210 return __xfrm_sk_clone_policy(sk, osk);
1214 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1216 static inline void xfrm_sk_free_policy(struct sock *sk)
1218 struct xfrm_policy *pol;
1220 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1221 if (unlikely(pol != NULL)) {
1222 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1223 sk->sk_policy[0] = NULL;
1225 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1226 if (unlikely(pol != NULL)) {
1227 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1228 sk->sk_policy[1] = NULL;
1234 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1235 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1236 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1237 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1238 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1242 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1246 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1250 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1252 unsigned int family)
1256 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1257 struct sk_buff *skb)
1261 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1262 struct sk_buff *skb)
1269 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1273 return (xfrm_address_t *)&fl->u.ip4.daddr;
1275 return (xfrm_address_t *)&fl->u.ip6.daddr;
1281 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1285 return (xfrm_address_t *)&fl->u.ip4.saddr;
1287 return (xfrm_address_t *)&fl->u.ip6.saddr;
1293 void xfrm_flowi_addr_get(const struct flowi *fl,
1294 xfrm_address_t *saddr, xfrm_address_t *daddr,
1295 unsigned short family)
1299 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1300 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1303 saddr->in6 = fl->u.ip6.saddr;
1304 daddr->in6 = fl->u.ip6.daddr;
1309 static __inline__ int
1310 __xfrm4_state_addr_check(const struct xfrm_state *x,
1311 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1313 if (daddr->a4 == x->id.daddr.a4 &&
1314 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1319 static __inline__ int
1320 __xfrm6_state_addr_check(const struct xfrm_state *x,
1321 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1323 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1324 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1325 ipv6_addr_any((struct in6_addr *)saddr) ||
1326 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1331 static __inline__ int
1332 xfrm_state_addr_check(const struct xfrm_state *x,
1333 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1334 unsigned short family)
1338 return __xfrm4_state_addr_check(x, daddr, saddr);
1340 return __xfrm6_state_addr_check(x, daddr, saddr);
1345 static __inline__ int
1346 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1347 unsigned short family)
1351 return __xfrm4_state_addr_check(x,
1352 (const xfrm_address_t *)&fl->u.ip4.daddr,
1353 (const xfrm_address_t *)&fl->u.ip4.saddr);
1355 return __xfrm6_state_addr_check(x,
1356 (const xfrm_address_t *)&fl->u.ip6.daddr,
1357 (const xfrm_address_t *)&fl->u.ip6.saddr);
1362 static inline int xfrm_state_kern(const struct xfrm_state *x)
1364 return atomic_read(&x->tunnel_users);
1367 static inline bool xfrm_id_proto_valid(u8 proto)
1373 #if IS_ENABLED(CONFIG_IPV6)
1374 case IPPROTO_ROUTING:
1375 case IPPROTO_DSTOPTS:
1383 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1384 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1386 return (!userproto || proto == userproto ||
1387 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1388 proto == IPPROTO_ESP ||
1389 proto == IPPROTO_COMP)));
1393 * xfrm algorithm information
1395 struct xfrm_algo_aead_info {
1400 struct xfrm_algo_auth_info {
1405 struct xfrm_algo_encr_info {
1411 struct xfrm_algo_comp_info {
1415 struct xfrm_algo_desc {
1419 u8 pfkey_supported:1;
1421 struct xfrm_algo_aead_info aead;
1422 struct xfrm_algo_auth_info auth;
1423 struct xfrm_algo_encr_info encr;
1424 struct xfrm_algo_comp_info comp;
1426 struct sadb_alg desc;
1429 /* XFRM protocol handlers. */
1430 struct xfrm4_protocol {
1431 int (*handler)(struct sk_buff *skb);
1432 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1434 int (*cb_handler)(struct sk_buff *skb, int err);
1435 int (*err_handler)(struct sk_buff *skb, u32 info);
1437 struct xfrm4_protocol __rcu *next;
1441 struct xfrm6_protocol {
1442 int (*handler)(struct sk_buff *skb);
1443 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1445 int (*cb_handler)(struct sk_buff *skb, int err);
1446 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1447 u8 type, u8 code, int offset, __be32 info);
1449 struct xfrm6_protocol __rcu *next;
1453 /* XFRM tunnel handlers. */
1454 struct xfrm_tunnel {
1455 int (*handler)(struct sk_buff *skb);
1456 int (*cb_handler)(struct sk_buff *skb, int err);
1457 int (*err_handler)(struct sk_buff *skb, u32 info);
1459 struct xfrm_tunnel __rcu *next;
1463 struct xfrm6_tunnel {
1464 int (*handler)(struct sk_buff *skb);
1465 int (*cb_handler)(struct sk_buff *skb, int err);
1466 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1467 u8 type, u8 code, int offset, __be32 info);
1468 struct xfrm6_tunnel __rcu *next;
1472 void xfrm_init(void);
1473 void xfrm4_init(void);
1474 int xfrm_state_init(struct net *net);
1475 void xfrm_state_fini(struct net *net);
1476 void xfrm4_state_init(void);
1477 void xfrm4_protocol_init(void);
1479 int xfrm6_init(void);
1480 void xfrm6_fini(void);
1481 int xfrm6_state_init(void);
1482 void xfrm6_state_fini(void);
1483 int xfrm6_protocol_init(void);
1484 void xfrm6_protocol_fini(void);
1486 static inline int xfrm6_init(void)
1490 static inline void xfrm6_fini(void)
1496 #ifdef CONFIG_XFRM_STATISTICS
1497 int xfrm_proc_init(struct net *net);
1498 void xfrm_proc_fini(struct net *net);
1501 int xfrm_sysctl_init(struct net *net);
1502 #ifdef CONFIG_SYSCTL
1503 void xfrm_sysctl_fini(struct net *net);
1505 static inline void xfrm_sysctl_fini(struct net *net)
1510 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1511 struct xfrm_address_filter *filter);
1512 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1513 int (*func)(struct xfrm_state *, int, void*), void *);
1514 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1515 struct xfrm_state *xfrm_state_alloc(struct net *net);
1516 void xfrm_state_free(struct xfrm_state *x);
1517 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1518 const xfrm_address_t *saddr,
1519 const struct flowi *fl,
1520 struct xfrm_tmpl *tmpl,
1521 struct xfrm_policy *pol, int *err,
1522 unsigned short family, u32 if_id);
1523 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1524 xfrm_address_t *daddr,
1525 xfrm_address_t *saddr,
1526 unsigned short family,
1527 u8 mode, u8 proto, u32 reqid);
1528 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1529 unsigned short family);
1530 int xfrm_state_check_expire(struct xfrm_state *x);
1531 void xfrm_state_insert(struct xfrm_state *x);
1532 int xfrm_state_add(struct xfrm_state *x);
1533 int xfrm_state_update(struct xfrm_state *x);
1534 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1535 const xfrm_address_t *daddr, __be32 spi,
1536 u8 proto, unsigned short family);
1537 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1538 const xfrm_address_t *daddr,
1539 const xfrm_address_t *saddr,
1541 unsigned short family);
1542 #ifdef CONFIG_XFRM_SUB_POLICY
1543 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1544 unsigned short family);
1545 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1546 unsigned short family);
1548 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1549 int n, unsigned short family)
1553 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1554 int n, unsigned short family)
1559 struct xfrmk_sadinfo {
1560 u32 sadhcnt; /* current hash bkts */
1561 u32 sadhmcnt; /* max allowed hash bkts */
1562 u32 sadcnt; /* current running count */
1565 struct xfrmk_spdinfo {
1576 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1577 int xfrm_state_delete(struct xfrm_state *x);
1578 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1579 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1580 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1581 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1582 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1583 int xfrm_init_replay(struct xfrm_state *x);
1584 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1585 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1586 int xfrm_init_state(struct xfrm_state *x);
1587 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1588 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1589 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1590 int (*finish)(struct net *, struct sock *,
1592 int xfrm_trans_queue(struct sk_buff *skb,
1593 int (*finish)(struct net *, struct sock *,
1595 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1596 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1598 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1599 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1602 void xfrm_local_error(struct sk_buff *skb, int mtu);
1603 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1604 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1606 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1607 int xfrm4_rcv(struct sk_buff *skb);
1608 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1610 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1612 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1613 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1614 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1615 return xfrm_input(skb, nexthdr, spi, 0);
1618 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1619 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1620 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1621 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1622 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1623 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1624 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1625 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1626 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1628 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1630 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1631 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1632 int xfrm6_rcv(struct sk_buff *skb);
1633 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1634 xfrm_address_t *saddr, u8 proto);
1635 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1636 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1637 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1638 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1639 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1640 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1641 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1642 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1643 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1644 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1648 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1649 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1650 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1651 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1654 static inline int xfrm_user_policy(struct sock *sk, int optname,
1655 sockptr_t optval, int optlen)
1657 return -ENOPROTOOPT;
1661 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1662 const xfrm_address_t *saddr,
1663 const xfrm_address_t *daddr,
1664 int family, u32 mark);
1666 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1668 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1669 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1670 int (*func)(struct xfrm_policy *, int, int, void*),
1672 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1673 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1674 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1675 const struct xfrm_mark *mark,
1676 u32 if_id, u8 type, int dir,
1677 struct xfrm_selector *sel,
1678 struct xfrm_sec_ctx *ctx, int delete,
1680 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1681 const struct xfrm_mark *mark, u32 if_id,
1682 u8 type, int dir, u32 id, int delete,
1684 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1685 void xfrm_policy_hash_rebuild(struct net *net);
1686 u32 xfrm_get_acqseq(void);
1687 int verify_spi_info(u8 proto, u32 min, u32 max);
1688 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1689 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1690 u8 mode, u32 reqid, u32 if_id, u8 proto,
1691 const xfrm_address_t *daddr,
1692 const xfrm_address_t *saddr, int create,
1693 unsigned short family);
1694 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1696 #ifdef CONFIG_XFRM_MIGRATE
1697 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1698 const struct xfrm_migrate *m, int num_bundles,
1699 const struct xfrm_kmaddress *k,
1700 const struct xfrm_encap_tmpl *encap);
1701 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1703 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1704 struct xfrm_migrate *m,
1705 struct xfrm_encap_tmpl *encap);
1706 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1707 struct xfrm_migrate *m, int num_bundles,
1708 struct xfrm_kmaddress *k, struct net *net,
1709 struct xfrm_encap_tmpl *encap, u32 if_id);
1712 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1713 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1714 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1715 xfrm_address_t *addr);
1717 void xfrm_input_init(void);
1718 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1720 void xfrm_probe_algs(void);
1721 int xfrm_count_pfkey_auth_supported(void);
1722 int xfrm_count_pfkey_enc_supported(void);
1723 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1724 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1725 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1726 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1727 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1728 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1729 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1730 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1731 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1734 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1735 const xfrm_address_t *b)
1737 return ipv6_addr_equal((const struct in6_addr *)a,
1738 (const struct in6_addr *)b);
1741 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1742 const xfrm_address_t *b,
1748 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1750 return xfrm6_addr_equal(a, b);
1754 static inline int xfrm_policy_id2dir(u32 index)
1760 static inline int xfrm_aevent_is_on(struct net *net)
1766 nlsk = rcu_dereference(net->xfrm.nlsk);
1768 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1773 static inline int xfrm_acquire_is_on(struct net *net)
1779 nlsk = rcu_dereference(net->xfrm.nlsk);
1781 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1788 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1790 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1793 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1795 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1798 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1800 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1803 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1805 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1808 #ifdef CONFIG_XFRM_MIGRATE
1809 static inline int xfrm_replay_clone(struct xfrm_state *x,
1810 struct xfrm_state *orig)
1813 x->replay_esn = kmemdup(orig->replay_esn,
1814 xfrm_replay_state_esn_len(orig->replay_esn),
1818 x->preplay_esn = kmemdup(orig->preplay_esn,
1819 xfrm_replay_state_esn_len(orig->preplay_esn),
1821 if (!x->preplay_esn)
1827 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1829 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1833 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1835 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1838 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1840 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1843 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1846 for (i = 0; i < n; i++)
1847 xfrm_state_put(*(states + i));
1850 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1853 for (i = 0; i < n; i++)
1854 xfrm_state_delete(*(states + i));
1859 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1861 struct sec_path *sp = skb_sec_path(skb);
1863 return sp->xvec[sp->len - 1];
1867 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1870 struct sec_path *sp = skb_sec_path(skb);
1872 if (!sp || !sp->olen || sp->len != sp->olen)
1875 return &sp->ovec[sp->olen - 1];
1881 void __init xfrm_dev_init(void);
1883 #ifdef CONFIG_XFRM_OFFLOAD
1884 void xfrm_dev_resume(struct sk_buff *skb);
1885 void xfrm_dev_backlog(struct softnet_data *sd);
1886 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1887 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1888 struct xfrm_user_offload *xuo);
1889 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1891 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1893 struct xfrm_state_offload *xso = &x->xso;
1895 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1896 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1899 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1901 struct xfrm_state *x = dst->xfrm;
1902 struct xfrm_dst *xdst;
1904 if (!x || !x->type_offload)
1907 xdst = (struct xfrm_dst *) dst;
1908 if (!x->xso.offload_handle && !xdst->child->xfrm)
1910 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1917 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1919 struct xfrm_state_offload *xso = &x->xso;
1922 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1925 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1927 struct xfrm_state_offload *xso = &x->xso;
1928 struct net_device *dev = xso->dev;
1930 if (dev && dev->xfrmdev_ops) {
1931 if (dev->xfrmdev_ops->xdo_dev_state_free)
1932 dev->xfrmdev_ops->xdo_dev_state_free(x);
1938 static inline void xfrm_dev_resume(struct sk_buff *skb)
1942 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1946 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1951 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1956 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1960 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1964 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1969 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1973 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1979 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1981 if (attrs[XFRMA_MARK])
1982 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1989 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1994 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1998 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2000 struct xfrm_mark *m = &x->props.smark;
2002 return (m->v & m->m) | (mark & ~m->m);
2005 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2010 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2014 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2015 unsigned int family)
2017 bool tunnel = false;
2021 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2025 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2029 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2035 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2036 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2038 struct xfrm_translator {
2039 /* Allocate frag_list and put compat translation there */
2040 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2042 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2043 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2044 int maxtype, const struct nla_policy *policy,
2045 struct netlink_ext_ack *extack);
2047 /* Translate 32-bit user_policy from sockptr */
2048 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2050 struct module *owner;
2053 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2054 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2055 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2056 extern struct xfrm_translator *xfrm_get_translator(void);
2057 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2059 static inline struct xfrm_translator *xfrm_get_translator(void)
2063 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2068 #if IS_ENABLED(CONFIG_IPV6)
2069 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2073 if (!sk || sk->sk_family != AF_INET6)
2076 proto = sk->sk_protocol;
2077 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2078 return inet6_sk(sk)->dontfrag;
2083 #endif /* _NET_XFRM_H */