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;
130 XFRM_DEV_OFFLOAD_IN = 1,
131 XFRM_DEV_OFFLOAD_OUT,
132 XFRM_DEV_OFFLOAD_FWD,
136 XFRM_DEV_OFFLOAD_UNSPECIFIED,
137 XFRM_DEV_OFFLOAD_CRYPTO,
138 XFRM_DEV_OFFLOAD_PACKET,
142 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
145 struct xfrm_dev_offload {
146 struct net_device *dev;
147 netdevice_tracker dev_tracker;
148 struct net_device *real_dev;
149 unsigned long offload_handle;
161 /* Flags for xfrm_mode. */
163 XFRM_MODE_FLAG_TUNNEL = 1,
166 enum xfrm_replay_mode {
167 XFRM_REPLAY_MODE_LEGACY,
168 XFRM_REPLAY_MODE_BMP,
169 XFRM_REPLAY_MODE_ESN,
172 /* Full description of state of transformer. */
174 possible_net_t xs_net;
176 struct hlist_node gclist;
177 struct hlist_node bydst;
179 struct hlist_node bysrc;
180 struct hlist_node byspi;
181 struct hlist_node byseq;
187 struct xfrm_selector sel;
188 struct xfrm_mark mark;
194 /* Key manager bits */
195 struct xfrm_state_walk km;
197 /* Parameters of this state. */
202 u8 aalgo, ealgo, calgo;
205 xfrm_address_t saddr;
209 struct xfrm_mark smark;
212 struct xfrm_lifetime_cfg lft;
214 /* Data for transformer */
215 struct xfrm_algo_auth *aalg;
216 struct xfrm_algo *ealg;
217 struct xfrm_algo *calg;
218 struct xfrm_algo_aead *aead;
221 /* mapping change rate limiting */
222 __be16 new_mapping_sport;
223 u32 new_mapping; /* seconds */
224 u32 mapping_maxage; /* seconds for input SA */
226 /* Data for encapsulator */
227 struct xfrm_encap_tmpl *encap;
228 struct sock __rcu *encap_sk;
230 /* Data for care-of address */
231 xfrm_address_t *coaddr;
233 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
234 struct xfrm_state *tunnel;
236 /* If a tunnel, number of users + 1 */
237 atomic_t tunnel_users;
239 /* State for replay detection */
240 struct xfrm_replay_state replay;
241 struct xfrm_replay_state_esn *replay_esn;
243 /* Replay detection state at the time we sent the last notification */
244 struct xfrm_replay_state preplay;
245 struct xfrm_replay_state_esn *preplay_esn;
247 /* replay detection mode */
248 enum xfrm_replay_mode repl_mode;
249 /* internal flag that only holds state for delayed aevent at the
254 /* Replay detection notification settings */
258 /* Replay detection notification timer */
259 struct timer_list rtimer;
262 struct xfrm_stats stats;
264 struct xfrm_lifetime_cur curlft;
265 struct hrtimer mtimer;
267 struct xfrm_dev_offload xso;
269 /* used to fix curlft->add_time when changing date */
275 struct page_frag xfrag;
277 /* Reference to data common to all the instances of this
279 const struct xfrm_type *type;
280 struct xfrm_mode inner_mode;
281 struct xfrm_mode inner_mode_iaf;
282 struct xfrm_mode outer_mode;
284 const struct xfrm_type_offload *type_offload;
286 /* Security context */
287 struct xfrm_sec_ctx *security;
289 /* Private data of this transformer, format is opaque,
290 * interpreted by xfrm_type methods. */
294 static inline struct net *xs_net(struct xfrm_state *x)
296 return read_pnet(&x->xs_net);
299 /* xflags - make enum if more show up */
300 #define XFRM_TIME_DEFER 1
301 #define XFRM_SOFT_EXPIRE 2
312 /* callback structure passed from either netlink or pfkey */
328 struct xfrm_if_decode_session_result {
334 bool (*decode_session)(struct sk_buff *skb,
335 unsigned short family,
336 struct xfrm_if_decode_session_result *res);
339 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
340 void xfrm_if_unregister_cb(void);
345 struct xfrm_policy_afinfo {
346 struct dst_ops *dst_ops;
347 struct dst_entry *(*dst_lookup)(struct net *net,
349 const xfrm_address_t *saddr,
350 const xfrm_address_t *daddr,
352 int (*get_saddr)(struct net *net, int oif,
353 xfrm_address_t *saddr,
354 xfrm_address_t *daddr,
356 int (*fill_dst)(struct xfrm_dst *xdst,
357 struct net_device *dev,
358 const struct flowi *fl);
359 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
362 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
363 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
364 void km_policy_notify(struct xfrm_policy *xp, int dir,
365 const struct km_event *c);
366 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
369 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
370 struct xfrm_policy *pol);
371 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
372 int __xfrm_state_delete(struct xfrm_state *x);
374 struct xfrm_state_afinfo {
378 const struct xfrm_type_offload *type_offload_esp;
380 const struct xfrm_type *type_esp;
381 const struct xfrm_type *type_ipip;
382 const struct xfrm_type *type_ipip6;
383 const struct xfrm_type *type_comp;
384 const struct xfrm_type *type_ah;
385 const struct xfrm_type *type_routing;
386 const struct xfrm_type *type_dstopts;
388 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
389 int (*transport_finish)(struct sk_buff *skb,
391 void (*local_error)(struct sk_buff *skb, u32 mtu);
394 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
395 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
396 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
397 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
399 struct xfrm_input_afinfo {
402 int (*callback)(struct sk_buff *skb, u8 protocol,
406 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
407 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
409 void xfrm_flush_gc(void);
410 void xfrm_state_delete_tunnel(struct xfrm_state *x);
413 struct module *owner;
416 #define XFRM_TYPE_NON_FRAGMENT 1
417 #define XFRM_TYPE_REPLAY_PROT 2
418 #define XFRM_TYPE_LOCAL_COADDR 4
419 #define XFRM_TYPE_REMOTE_COADDR 8
421 int (*init_state)(struct xfrm_state *x,
422 struct netlink_ext_ack *extack);
423 void (*destructor)(struct xfrm_state *);
424 int (*input)(struct xfrm_state *, struct sk_buff *skb);
425 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
426 int (*reject)(struct xfrm_state *, struct sk_buff *,
427 const struct flowi *);
430 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
431 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
433 struct xfrm_type_offload {
434 struct module *owner;
436 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
437 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
438 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
441 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
442 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
444 static inline int xfrm_af2proto(unsigned int family)
456 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
458 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
459 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
460 return &x->inner_mode;
462 return &x->inner_mode_iaf;
466 /* id in template is interpreted as:
467 * daddr - destination of tunnel, may be zero for transport mode.
468 * spi - zero to acquire spi. Not zero if spi is static, then
469 * daddr must be fixed too.
470 * proto - AH/ESP/IPCOMP
474 /* Source address of tunnel. Ignored, if it is not a tunnel. */
475 xfrm_address_t saddr;
477 unsigned short encap_family;
481 /* Mode: transport, tunnel etc. */
484 /* Sharing mode: unique, this session only, this user only etc. */
487 /* May skip this transfomration if no SA is found */
490 /* Skip aalgos/ealgos/calgos checks. */
493 /* Bit mask of algos allowed for acquisition */
499 #define XFRM_MAX_DEPTH 6
500 #define XFRM_MAX_OFFLOAD_DEPTH 1
502 struct xfrm_policy_walk_entry {
503 struct list_head all;
507 struct xfrm_policy_walk {
508 struct xfrm_policy_walk_entry walk;
513 struct xfrm_policy_queue {
514 struct sk_buff_head hold_queue;
515 struct timer_list hold_timer;
516 unsigned long timeout;
520 possible_net_t xp_net;
521 struct hlist_node bydst;
522 struct hlist_node byidx;
524 /* This lock only affects elements except for entry. */
528 struct timer_list timer;
534 struct xfrm_mark mark;
535 struct xfrm_selector selector;
536 struct xfrm_lifetime_cfg lft;
537 struct xfrm_lifetime_cur curlft;
538 struct xfrm_policy_walk_entry walk;
539 struct xfrm_policy_queue polq;
546 struct xfrm_sec_ctx *security;
547 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
548 struct hlist_node bydst_inexact_list;
551 struct xfrm_dev_offload xdo;
554 static inline struct net *xp_net(const struct xfrm_policy *xp)
556 return read_pnet(&xp->xp_net);
559 struct xfrm_kmaddress {
560 xfrm_address_t local;
561 xfrm_address_t remote;
566 struct xfrm_migrate {
567 xfrm_address_t old_daddr;
568 xfrm_address_t old_saddr;
569 xfrm_address_t new_daddr;
570 xfrm_address_t new_saddr;
579 #define XFRM_KM_TIMEOUT 30
581 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
582 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
584 /* default aevent timeout in units of 100ms */
585 #define XFRM_AE_ETIME 10
586 /* Async Event timer multiplier */
587 #define XFRM_AE_ETH_M 10
588 /* default seq threshold size */
589 #define XFRM_AE_SEQT_SIZE 2
592 struct list_head list;
593 int (*notify)(struct xfrm_state *x, const struct km_event *c);
594 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
595 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
596 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
597 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
598 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
599 int (*migrate)(const struct xfrm_selector *sel,
601 const struct xfrm_migrate *m,
603 const struct xfrm_kmaddress *k,
604 const struct xfrm_encap_tmpl *encap);
605 bool (*is_alive)(const struct km_event *c);
608 void xfrm_register_km(struct xfrm_mgr *km);
609 void xfrm_unregister_km(struct xfrm_mgr *km);
611 struct xfrm_tunnel_skb_cb {
613 struct inet_skb_parm h4;
614 struct inet6_skb_parm h6;
618 struct ip_tunnel *ip4;
623 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
626 * This structure is used for the duration where packets are being
627 * transformed by IPsec. As soon as the packet leaves IPsec the
628 * area beyond the generic IP part may be overwritten.
631 struct xfrm_tunnel_skb_cb header;
633 /* Sequence number for replay protection. */
646 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
649 * This structure is used by the afinfo prepare_input/prepare_output functions
650 * to transmit header information to the mode input/output functions.
652 struct xfrm_mode_skb_cb {
653 struct xfrm_tunnel_skb_cb header;
655 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
659 /* IP header length (excluding options or extension headers). */
662 /* TOS for IPv4, class for IPv6. */
665 /* TTL for IPv4, hop limitfor IPv6. */
668 /* Protocol for IPv4, NH for IPv6. */
671 /* Option length for IPv4, zero for IPv6. */
674 /* Used by IPv6 only, zero for IPv4. */
678 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
681 * This structure is used by the input processing to locate the SPI and
682 * related information.
684 struct xfrm_spi_skb_cb {
685 struct xfrm_tunnel_skb_cb header;
687 unsigned int daddroff;
692 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
694 #ifdef CONFIG_AUDITSYSCALL
695 static inline struct audit_buffer *xfrm_audit_start(const char *op)
697 struct audit_buffer *audit_buf = NULL;
699 if (audit_enabled == AUDIT_OFF)
701 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
702 AUDIT_MAC_IPSEC_EVENT);
703 if (audit_buf == NULL)
705 audit_log_format(audit_buf, "op=%s", op);
709 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
710 struct audit_buffer *audit_buf)
712 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
713 audit_get_loginuid(current) :
715 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
718 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
719 audit_log_task_context(audit_buf);
722 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
723 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
725 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
726 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
727 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
728 struct sk_buff *skb);
729 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
731 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
732 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
734 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
738 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
743 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
748 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
753 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
758 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
763 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
764 struct sk_buff *skb, __be32 net_seq)
768 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
773 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
774 __be32 net_spi, __be32 net_seq)
778 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
779 struct sk_buff *skb, u8 proto)
782 #endif /* CONFIG_AUDITSYSCALL */
784 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
786 if (likely(policy != NULL))
787 refcount_inc(&policy->refcnt);
790 void xfrm_policy_destroy(struct xfrm_policy *policy);
792 static inline void xfrm_pol_put(struct xfrm_policy *policy)
794 if (refcount_dec_and_test(&policy->refcnt))
795 xfrm_policy_destroy(policy);
798 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
801 for (i = npols - 1; i >= 0; --i)
802 xfrm_pol_put(pols[i]);
805 void __xfrm_state_destroy(struct xfrm_state *, bool);
807 static inline void __xfrm_state_put(struct xfrm_state *x)
809 refcount_dec(&x->refcnt);
812 static inline void xfrm_state_put(struct xfrm_state *x)
814 if (refcount_dec_and_test(&x->refcnt))
815 __xfrm_state_destroy(x, false);
818 static inline void xfrm_state_put_sync(struct xfrm_state *x)
820 if (refcount_dec_and_test(&x->refcnt))
821 __xfrm_state_destroy(x, true);
824 static inline void xfrm_state_hold(struct xfrm_state *x)
826 refcount_inc(&x->refcnt);
829 static inline bool addr_match(const void *token1, const void *token2,
830 unsigned int prefixlen)
832 const __be32 *a1 = token1;
833 const __be32 *a2 = token2;
837 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
838 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
841 if (memcmp(a1, a2, pdw << 2))
847 mask = htonl((0xffffffff) << (32 - pbi));
849 if ((a1[pdw] ^ a2[pdw]) & mask)
856 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
858 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
859 if (sizeof(long) == 4 && prefixlen == 0)
861 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
865 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
868 switch(fl->flowi_proto) {
871 case IPPROTO_UDPLITE:
873 port = uli->ports.sport;
877 port = htons(uli->icmpt.type);
880 port = htons(uli->mht.type);
883 port = htons(ntohl(uli->gre_key) >> 16);
892 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
895 switch(fl->flowi_proto) {
898 case IPPROTO_UDPLITE:
900 port = uli->ports.dport;
904 port = htons(uli->icmpt.code);
907 port = htons(ntohl(uli->gre_key) & 0xffff);
915 bool xfrm_selector_match(const struct xfrm_selector *sel,
916 const struct flowi *fl, unsigned short family);
918 #ifdef CONFIG_SECURITY_NETWORK_XFRM
919 /* If neither has a context --> match
920 * Otherwise, both must have a context and the sids, doi, alg must match
922 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
924 return ((!s1 && !s2) ||
926 (s1->ctx_sid == s2->ctx_sid) &&
927 (s1->ctx_doi == s2->ctx_doi) &&
928 (s1->ctx_alg == s2->ctx_alg)));
931 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
937 /* A struct encoding bundle of transformations to apply to some set of flow.
939 * xdst->child points to the next element of bundle.
940 * dst->xfrm points to an instanse of transformer.
942 * Due to unfortunate limitations of current routing cache, which we
943 * have no time to fix, it mirrors struct rtable and bound to the same
944 * routing key, including saddr,daddr. However, we can have many of
945 * bundles differing by session id. All the bundles grow from a parent
950 struct dst_entry dst;
954 struct dst_entry *route;
955 struct dst_entry *child;
956 struct dst_entry *path;
957 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
958 int num_pols, num_xfrms;
961 u32 route_mtu_cached;
962 u32 child_mtu_cached;
967 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
970 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
971 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
976 return (struct dst_entry *) dst;
979 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
982 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
983 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
991 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
996 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
998 xfrm_pols_put(xdst->pols, xdst->num_pols);
999 dst_release(xdst->route);
1000 if (likely(xdst->u.dst.xfrm))
1001 xfrm_state_put(xdst->u.dst.xfrm);
1005 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1007 struct xfrm_if_parms {
1008 int link; /* ifindex of underlying L2 interface */
1009 u32 if_id; /* interface identifyer */
1014 struct xfrm_if __rcu *next; /* next interface in list */
1015 struct net_device *dev; /* virtual device associated with interface */
1016 struct net *net; /* netns for packet i/o */
1017 struct xfrm_if_parms p; /* interface parms */
1019 struct gro_cells gro_cells;
1022 struct xfrm_offload {
1023 /* Output sequence number for replay protection on offloading. */
1030 #define SA_DELETE_REQ 1
1031 #define CRYPTO_DONE 2
1032 #define CRYPTO_NEXT_DONE 4
1033 #define CRYPTO_FALLBACK 8
1034 #define XFRM_GSO_SEGMENT 16
1037 #define XFRM_DEV_RESUME 128
1038 #define XFRM_XMIT 256
1041 #define CRYPTO_SUCCESS 1
1042 #define CRYPTO_GENERIC_ERROR 2
1043 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1044 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1045 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1046 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1047 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1048 #define CRYPTO_INVALID_PROTOCOL 128
1058 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1059 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1062 struct sec_path *secpath_set(struct sk_buff *skb);
1065 secpath_reset(struct sk_buff *skb)
1068 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1073 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1077 return addr->a4 == 0;
1079 return ipv6_addr_any(&addr->in6);
1085 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1087 return (tmpl->saddr.a4 &&
1088 tmpl->saddr.a4 != x->props.saddr.a4);
1092 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1094 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1095 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1099 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1103 return __xfrm4_state_addr_cmp(tmpl, x);
1105 return __xfrm6_state_addr_cmp(tmpl, x);
1111 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1113 struct sec_path *sp = skb_sec_path(skb);
1115 return sp->xvec[sp->len - 1];
1119 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1122 struct sec_path *sp = skb_sec_path(skb);
1124 if (!sp || !sp->olen || sp->len != sp->olen)
1127 return &sp->ovec[sp->olen - 1];
1134 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1135 unsigned short family);
1137 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1140 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1141 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1146 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1147 int dir, unsigned short family)
1149 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1150 /* same dst may be used for traffic originating from
1151 * devices with different policy settings.
1153 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1155 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1158 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1159 struct sk_buff *skb,
1160 unsigned int family, int reverse)
1162 struct net *net = dev_net(skb->dev);
1163 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1164 struct xfrm_offload *xo = xfrm_offload(skb);
1165 struct xfrm_state *x;
1167 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1168 return __xfrm_policy_check(sk, ndir, skb, family);
1171 x = xfrm_input_state(skb);
1172 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1173 return (xo->flags & CRYPTO_DONE) &&
1174 (xo->status & CRYPTO_SUCCESS);
1177 return __xfrm_check_nopolicy(net, skb, dir) ||
1178 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1179 __xfrm_policy_check(sk, ndir, skb, family);
1182 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1184 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1187 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1189 return xfrm_policy_check(sk, dir, skb, AF_INET);
1192 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1194 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1197 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1198 struct sk_buff *skb)
1200 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1203 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1204 struct sk_buff *skb)
1206 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1209 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1210 unsigned int family, int reverse);
1212 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1213 unsigned int family)
1215 return __xfrm_decode_session(skb, fl, family, 0);
1218 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1220 unsigned int family)
1222 return __xfrm_decode_session(skb, fl, family, 1);
1225 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1227 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1229 struct net *net = dev_net(skb->dev);
1231 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1232 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1235 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1236 __xfrm_route_forward(skb, family);
1239 static inline int xfrm4_route_forward(struct sk_buff *skb)
1241 return xfrm_route_forward(skb, AF_INET);
1244 static inline int xfrm6_route_forward(struct sk_buff *skb)
1246 return xfrm_route_forward(skb, AF_INET6);
1249 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1251 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1253 if (!sk_fullsock(osk))
1255 sk->sk_policy[0] = NULL;
1256 sk->sk_policy[1] = NULL;
1257 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1258 return __xfrm_sk_clone_policy(sk, osk);
1262 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1264 static inline void xfrm_sk_free_policy(struct sock *sk)
1266 struct xfrm_policy *pol;
1268 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1269 if (unlikely(pol != NULL)) {
1270 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1271 sk->sk_policy[0] = NULL;
1273 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1274 if (unlikely(pol != NULL)) {
1275 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1276 sk->sk_policy[1] = NULL;
1282 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1283 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1284 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1285 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1286 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1290 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1294 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1298 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1300 unsigned int family)
1304 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1305 struct sk_buff *skb)
1309 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1310 struct sk_buff *skb)
1317 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1321 return (xfrm_address_t *)&fl->u.ip4.daddr;
1323 return (xfrm_address_t *)&fl->u.ip6.daddr;
1329 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1333 return (xfrm_address_t *)&fl->u.ip4.saddr;
1335 return (xfrm_address_t *)&fl->u.ip6.saddr;
1341 void xfrm_flowi_addr_get(const struct flowi *fl,
1342 xfrm_address_t *saddr, xfrm_address_t *daddr,
1343 unsigned short family)
1347 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1348 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1351 saddr->in6 = fl->u.ip6.saddr;
1352 daddr->in6 = fl->u.ip6.daddr;
1357 static __inline__ int
1358 __xfrm4_state_addr_check(const struct xfrm_state *x,
1359 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1361 if (daddr->a4 == x->id.daddr.a4 &&
1362 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1367 static __inline__ int
1368 __xfrm6_state_addr_check(const struct xfrm_state *x,
1369 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1371 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1372 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1373 ipv6_addr_any((struct in6_addr *)saddr) ||
1374 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1379 static __inline__ int
1380 xfrm_state_addr_check(const struct xfrm_state *x,
1381 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1382 unsigned short family)
1386 return __xfrm4_state_addr_check(x, daddr, saddr);
1388 return __xfrm6_state_addr_check(x, daddr, saddr);
1393 static __inline__ int
1394 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1395 unsigned short family)
1399 return __xfrm4_state_addr_check(x,
1400 (const xfrm_address_t *)&fl->u.ip4.daddr,
1401 (const xfrm_address_t *)&fl->u.ip4.saddr);
1403 return __xfrm6_state_addr_check(x,
1404 (const xfrm_address_t *)&fl->u.ip6.daddr,
1405 (const xfrm_address_t *)&fl->u.ip6.saddr);
1410 static inline int xfrm_state_kern(const struct xfrm_state *x)
1412 return atomic_read(&x->tunnel_users);
1415 static inline bool xfrm_id_proto_valid(u8 proto)
1421 #if IS_ENABLED(CONFIG_IPV6)
1422 case IPPROTO_ROUTING:
1423 case IPPROTO_DSTOPTS:
1431 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1432 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1434 return (!userproto || proto == userproto ||
1435 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1436 proto == IPPROTO_ESP ||
1437 proto == IPPROTO_COMP)));
1441 * xfrm algorithm information
1443 struct xfrm_algo_aead_info {
1448 struct xfrm_algo_auth_info {
1453 struct xfrm_algo_encr_info {
1459 struct xfrm_algo_comp_info {
1463 struct xfrm_algo_desc {
1467 u8 pfkey_supported:1;
1469 struct xfrm_algo_aead_info aead;
1470 struct xfrm_algo_auth_info auth;
1471 struct xfrm_algo_encr_info encr;
1472 struct xfrm_algo_comp_info comp;
1474 struct sadb_alg desc;
1477 /* XFRM protocol handlers. */
1478 struct xfrm4_protocol {
1479 int (*handler)(struct sk_buff *skb);
1480 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1482 int (*cb_handler)(struct sk_buff *skb, int err);
1483 int (*err_handler)(struct sk_buff *skb, u32 info);
1485 struct xfrm4_protocol __rcu *next;
1489 struct xfrm6_protocol {
1490 int (*handler)(struct sk_buff *skb);
1491 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1493 int (*cb_handler)(struct sk_buff *skb, int err);
1494 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1495 u8 type, u8 code, int offset, __be32 info);
1497 struct xfrm6_protocol __rcu *next;
1501 /* XFRM tunnel handlers. */
1502 struct xfrm_tunnel {
1503 int (*handler)(struct sk_buff *skb);
1504 int (*cb_handler)(struct sk_buff *skb, int err);
1505 int (*err_handler)(struct sk_buff *skb, u32 info);
1507 struct xfrm_tunnel __rcu *next;
1511 struct xfrm6_tunnel {
1512 int (*handler)(struct sk_buff *skb);
1513 int (*cb_handler)(struct sk_buff *skb, int err);
1514 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1515 u8 type, u8 code, int offset, __be32 info);
1516 struct xfrm6_tunnel __rcu *next;
1520 void xfrm_init(void);
1521 void xfrm4_init(void);
1522 int xfrm_state_init(struct net *net);
1523 void xfrm_state_fini(struct net *net);
1524 void xfrm4_state_init(void);
1525 void xfrm4_protocol_init(void);
1527 int xfrm6_init(void);
1528 void xfrm6_fini(void);
1529 int xfrm6_state_init(void);
1530 void xfrm6_state_fini(void);
1531 int xfrm6_protocol_init(void);
1532 void xfrm6_protocol_fini(void);
1534 static inline int xfrm6_init(void)
1538 static inline void xfrm6_fini(void)
1544 #ifdef CONFIG_XFRM_STATISTICS
1545 int xfrm_proc_init(struct net *net);
1546 void xfrm_proc_fini(struct net *net);
1549 int xfrm_sysctl_init(struct net *net);
1550 #ifdef CONFIG_SYSCTL
1551 void xfrm_sysctl_fini(struct net *net);
1553 static inline void xfrm_sysctl_fini(struct net *net)
1558 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1559 struct xfrm_address_filter *filter);
1560 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1561 int (*func)(struct xfrm_state *, int, void*), void *);
1562 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1563 struct xfrm_state *xfrm_state_alloc(struct net *net);
1564 void xfrm_state_free(struct xfrm_state *x);
1565 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1566 const xfrm_address_t *saddr,
1567 const struct flowi *fl,
1568 struct xfrm_tmpl *tmpl,
1569 struct xfrm_policy *pol, int *err,
1570 unsigned short family, u32 if_id);
1571 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1572 xfrm_address_t *daddr,
1573 xfrm_address_t *saddr,
1574 unsigned short family,
1575 u8 mode, u8 proto, u32 reqid);
1576 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1577 unsigned short family);
1578 int xfrm_state_check_expire(struct xfrm_state *x);
1579 #ifdef CONFIG_XFRM_OFFLOAD
1580 static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x)
1582 struct xfrm_dev_offload *xdo = &x->xso;
1583 struct net_device *dev = xdo->dev;
1585 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1588 if (dev && dev->xfrmdev_ops &&
1589 dev->xfrmdev_ops->xdo_dev_state_update_curlft)
1590 dev->xfrmdev_ops->xdo_dev_state_update_curlft(x);
1594 static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {}
1596 void xfrm_state_insert(struct xfrm_state *x);
1597 int xfrm_state_add(struct xfrm_state *x);
1598 int xfrm_state_update(struct xfrm_state *x);
1599 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1600 const xfrm_address_t *daddr, __be32 spi,
1601 u8 proto, unsigned short family);
1602 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1603 const xfrm_address_t *daddr,
1604 const xfrm_address_t *saddr,
1606 unsigned short family);
1607 #ifdef CONFIG_XFRM_SUB_POLICY
1608 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1609 unsigned short family);
1610 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1611 unsigned short family);
1613 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1614 int n, unsigned short family)
1618 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1619 int n, unsigned short family)
1624 struct xfrmk_sadinfo {
1625 u32 sadhcnt; /* current hash bkts */
1626 u32 sadhmcnt; /* max allowed hash bkts */
1627 u32 sadcnt; /* current running count */
1630 struct xfrmk_spdinfo {
1641 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1642 int xfrm_state_delete(struct xfrm_state *x);
1643 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1644 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1645 int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1647 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1648 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1649 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1650 int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1651 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1652 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1653 struct netlink_ext_ack *extack);
1654 int xfrm_init_state(struct xfrm_state *x);
1655 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1656 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1657 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1658 int (*finish)(struct net *, struct sock *,
1660 int xfrm_trans_queue(struct sk_buff *skb,
1661 int (*finish)(struct net *, struct sock *,
1663 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1664 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1666 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1667 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1670 void xfrm_local_error(struct sk_buff *skb, int mtu);
1671 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1672 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1674 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1675 int xfrm4_rcv(struct sk_buff *skb);
1677 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1679 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1680 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1681 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1682 return xfrm_input(skb, nexthdr, spi, 0);
1685 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1686 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1687 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1688 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1689 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1690 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1691 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1692 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1694 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1696 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1697 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1698 int xfrm6_rcv(struct sk_buff *skb);
1699 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1700 xfrm_address_t *saddr, u8 proto);
1701 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1702 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1703 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1704 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1705 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1706 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1707 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1708 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1711 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1712 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1713 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1714 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1717 static inline int xfrm_user_policy(struct sock *sk, int optname,
1718 sockptr_t optval, int optlen)
1720 return -ENOPROTOOPT;
1724 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1725 const xfrm_address_t *saddr,
1726 const xfrm_address_t *daddr,
1727 int family, u32 mark);
1729 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1731 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1732 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1733 int (*func)(struct xfrm_policy *, int, int, void*),
1735 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1736 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1737 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1738 const struct xfrm_mark *mark,
1739 u32 if_id, u8 type, int dir,
1740 struct xfrm_selector *sel,
1741 struct xfrm_sec_ctx *ctx, int delete,
1743 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1744 const struct xfrm_mark *mark, u32 if_id,
1745 u8 type, int dir, u32 id, int delete,
1747 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1748 void xfrm_policy_hash_rebuild(struct net *net);
1749 u32 xfrm_get_acqseq(void);
1750 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1751 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1752 struct netlink_ext_ack *extack);
1753 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1754 u8 mode, u32 reqid, u32 if_id, u8 proto,
1755 const xfrm_address_t *daddr,
1756 const xfrm_address_t *saddr, int create,
1757 unsigned short family);
1758 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1760 #ifdef CONFIG_XFRM_MIGRATE
1761 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1762 const struct xfrm_migrate *m, int num_bundles,
1763 const struct xfrm_kmaddress *k,
1764 const struct xfrm_encap_tmpl *encap);
1765 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1767 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1768 struct xfrm_migrate *m,
1769 struct xfrm_encap_tmpl *encap);
1770 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1771 struct xfrm_migrate *m, int num_bundles,
1772 struct xfrm_kmaddress *k, struct net *net,
1773 struct xfrm_encap_tmpl *encap, u32 if_id,
1774 struct netlink_ext_ack *extack);
1777 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1778 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1779 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1780 xfrm_address_t *addr);
1782 void xfrm_input_init(void);
1783 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1785 void xfrm_probe_algs(void);
1786 int xfrm_count_pfkey_auth_supported(void);
1787 int xfrm_count_pfkey_enc_supported(void);
1788 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1789 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1790 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1791 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1792 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1793 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1794 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1795 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1796 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1799 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1800 const xfrm_address_t *b)
1802 return ipv6_addr_equal((const struct in6_addr *)a,
1803 (const struct in6_addr *)b);
1806 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1807 const xfrm_address_t *b,
1813 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1815 return xfrm6_addr_equal(a, b);
1819 static inline int xfrm_policy_id2dir(u32 index)
1825 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1826 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1827 void xfrm_replay_notify(struct xfrm_state *x, int event);
1828 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1829 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1831 static inline int xfrm_aevent_is_on(struct net *net)
1837 nlsk = rcu_dereference(net->xfrm.nlsk);
1839 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1844 static inline int xfrm_acquire_is_on(struct net *net)
1850 nlsk = rcu_dereference(net->xfrm.nlsk);
1852 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1859 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1861 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1864 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1866 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1869 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1871 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1874 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1876 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1879 #ifdef CONFIG_XFRM_MIGRATE
1880 static inline int xfrm_replay_clone(struct xfrm_state *x,
1881 struct xfrm_state *orig)
1884 x->replay_esn = kmemdup(orig->replay_esn,
1885 xfrm_replay_state_esn_len(orig->replay_esn),
1889 x->preplay_esn = kmemdup(orig->preplay_esn,
1890 xfrm_replay_state_esn_len(orig->preplay_esn),
1892 if (!x->preplay_esn)
1898 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1900 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1904 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1906 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1909 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1911 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1914 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1917 for (i = 0; i < n; i++)
1918 xfrm_state_put(*(states + i));
1921 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1924 for (i = 0; i < n; i++)
1925 xfrm_state_delete(*(states + i));
1929 void __init xfrm_dev_init(void);
1931 #ifdef CONFIG_XFRM_OFFLOAD
1932 void xfrm_dev_resume(struct sk_buff *skb);
1933 void xfrm_dev_backlog(struct softnet_data *sd);
1934 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1935 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1936 struct xfrm_user_offload *xuo,
1937 struct netlink_ext_ack *extack);
1938 int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1939 struct xfrm_user_offload *xuo, u8 dir,
1940 struct netlink_ext_ack *extack);
1941 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1943 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1945 struct xfrm_dev_offload *xso = &x->xso;
1947 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1948 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1951 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1953 struct xfrm_state *x = dst->xfrm;
1954 struct xfrm_dst *xdst;
1956 if (!x || !x->type_offload)
1959 xdst = (struct xfrm_dst *) dst;
1960 if (!x->xso.offload_handle && !xdst->child->xfrm)
1962 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1969 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1971 struct xfrm_dev_offload *xso = &x->xso;
1974 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1977 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1979 struct xfrm_dev_offload *xso = &x->xso;
1980 struct net_device *dev = xso->dev;
1982 if (dev && dev->xfrmdev_ops) {
1983 if (dev->xfrmdev_ops->xdo_dev_state_free)
1984 dev->xfrmdev_ops->xdo_dev_state_free(x);
1986 netdev_put(dev, &xso->dev_tracker);
1990 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1992 struct xfrm_dev_offload *xdo = &x->xdo;
1993 struct net_device *dev = xdo->dev;
1995 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
1996 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
1999 static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2001 struct xfrm_dev_offload *xdo = &x->xdo;
2002 struct net_device *dev = xdo->dev;
2004 if (dev && dev->xfrmdev_ops) {
2005 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2006 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2008 netdev_put(dev, &xdo->dev_tracker);
2012 static inline void xfrm_dev_resume(struct sk_buff *skb)
2016 static inline void xfrm_dev_backlog(struct softnet_data *sd)
2020 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2025 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2030 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2034 static inline void xfrm_dev_state_free(struct xfrm_state *x)
2038 static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2039 struct xfrm_user_offload *xuo, u8 dir,
2040 struct netlink_ext_ack *extack)
2045 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2049 static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2053 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2058 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2062 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2068 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2070 if (attrs[XFRMA_MARK])
2071 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2078 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2083 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2087 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2089 struct xfrm_mark *m = &x->props.smark;
2091 return (m->v & m->m) | (mark & ~m->m);
2094 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2099 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2103 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2104 unsigned int family)
2106 bool tunnel = false;
2110 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2114 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2118 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2124 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2125 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2127 struct xfrm_translator {
2128 /* Allocate frag_list and put compat translation there */
2129 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2131 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2132 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2133 int maxtype, const struct nla_policy *policy,
2134 struct netlink_ext_ack *extack);
2136 /* Translate 32-bit user_policy from sockptr */
2137 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2139 struct module *owner;
2142 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2143 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2144 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2145 extern struct xfrm_translator *xfrm_get_translator(void);
2146 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2148 static inline struct xfrm_translator *xfrm_get_translator(void)
2152 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2157 #if IS_ENABLED(CONFIG_IPV6)
2158 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2162 if (!sk || sk->sk_family != AF_INET6)
2165 proto = sk->sk_protocol;
2166 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2167 return inet6_sk(sk)->dontfrag;
2173 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2174 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2176 extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2178 int register_xfrm_interface_bpf(void);
2182 static inline int register_xfrm_interface_bpf(void)
2189 #endif /* _NET_XFRM_H */