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 netdevice_tracker dev_tracker;
132 struct net_device *real_dev;
133 unsigned long offload_handle;
134 unsigned int num_exthdrs;
144 /* Flags for xfrm_mode. */
146 XFRM_MODE_FLAG_TUNNEL = 1,
149 enum xfrm_replay_mode {
150 XFRM_REPLAY_MODE_LEGACY,
151 XFRM_REPLAY_MODE_BMP,
152 XFRM_REPLAY_MODE_ESN,
155 /* Full description of state of transformer. */
157 possible_net_t xs_net;
159 struct hlist_node gclist;
160 struct hlist_node bydst;
162 struct hlist_node bysrc;
163 struct hlist_node byspi;
164 struct hlist_node byseq;
170 struct xfrm_selector sel;
171 struct xfrm_mark mark;
177 /* Key manager bits */
178 struct xfrm_state_walk km;
180 /* Parameters of this state. */
185 u8 aalgo, ealgo, calgo;
188 xfrm_address_t saddr;
192 struct xfrm_mark smark;
195 struct xfrm_lifetime_cfg lft;
197 /* Data for transformer */
198 struct xfrm_algo_auth *aalg;
199 struct xfrm_algo *ealg;
200 struct xfrm_algo *calg;
201 struct xfrm_algo_aead *aead;
204 /* mapping change rate limiting */
205 __be16 new_mapping_sport;
206 u32 new_mapping; /* seconds */
207 u32 mapping_maxage; /* seconds for input SA */
209 /* Data for encapsulator */
210 struct xfrm_encap_tmpl *encap;
211 struct sock __rcu *encap_sk;
213 /* Data for care-of address */
214 xfrm_address_t *coaddr;
216 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
217 struct xfrm_state *tunnel;
219 /* If a tunnel, number of users + 1 */
220 atomic_t tunnel_users;
222 /* State for replay detection */
223 struct xfrm_replay_state replay;
224 struct xfrm_replay_state_esn *replay_esn;
226 /* Replay detection state at the time we sent the last notification */
227 struct xfrm_replay_state preplay;
228 struct xfrm_replay_state_esn *preplay_esn;
230 /* replay detection mode */
231 enum xfrm_replay_mode repl_mode;
232 /* internal flag that only holds state for delayed aevent at the
237 /* Replay detection notification settings */
241 /* Replay detection notification timer */
242 struct timer_list rtimer;
245 struct xfrm_stats stats;
247 struct xfrm_lifetime_cur curlft;
248 struct hrtimer mtimer;
250 struct xfrm_state_offload xso;
252 /* used to fix curlft->add_time when changing date */
258 struct page_frag xfrag;
260 /* Reference to data common to all the instances of this
262 const struct xfrm_type *type;
263 struct xfrm_mode inner_mode;
264 struct xfrm_mode inner_mode_iaf;
265 struct xfrm_mode outer_mode;
267 const struct xfrm_type_offload *type_offload;
269 /* Security context */
270 struct xfrm_sec_ctx *security;
272 /* Private data of this transformer, format is opaque,
273 * interpreted by xfrm_type methods. */
277 static inline struct net *xs_net(struct xfrm_state *x)
279 return read_pnet(&x->xs_net);
282 /* xflags - make enum if more show up */
283 #define XFRM_TIME_DEFER 1
284 #define XFRM_SOFT_EXPIRE 2
295 /* callback structure passed from either netlink or pfkey */
312 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
313 unsigned short family);
316 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
317 void xfrm_if_unregister_cb(void);
322 struct xfrm_policy_afinfo {
323 struct dst_ops *dst_ops;
324 struct dst_entry *(*dst_lookup)(struct net *net,
326 const xfrm_address_t *saddr,
327 const xfrm_address_t *daddr,
329 int (*get_saddr)(struct net *net, int oif,
330 xfrm_address_t *saddr,
331 xfrm_address_t *daddr,
333 int (*fill_dst)(struct xfrm_dst *xdst,
334 struct net_device *dev,
335 const struct flowi *fl);
336 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
339 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
340 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
341 void km_policy_notify(struct xfrm_policy *xp, int dir,
342 const struct km_event *c);
343 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
346 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
347 struct xfrm_policy *pol);
348 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
349 int __xfrm_state_delete(struct xfrm_state *x);
351 struct xfrm_state_afinfo {
355 const struct xfrm_type_offload *type_offload_esp;
357 const struct xfrm_type *type_esp;
358 const struct xfrm_type *type_ipip;
359 const struct xfrm_type *type_ipip6;
360 const struct xfrm_type *type_comp;
361 const struct xfrm_type *type_ah;
362 const struct xfrm_type *type_routing;
363 const struct xfrm_type *type_dstopts;
365 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
366 int (*transport_finish)(struct sk_buff *skb,
368 void (*local_error)(struct sk_buff *skb, u32 mtu);
371 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
372 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
373 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
374 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
376 struct xfrm_input_afinfo {
379 int (*callback)(struct sk_buff *skb, u8 protocol,
383 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
384 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
386 void xfrm_flush_gc(void);
387 void xfrm_state_delete_tunnel(struct xfrm_state *x);
390 struct module *owner;
393 #define XFRM_TYPE_NON_FRAGMENT 1
394 #define XFRM_TYPE_REPLAY_PROT 2
395 #define XFRM_TYPE_LOCAL_COADDR 4
396 #define XFRM_TYPE_REMOTE_COADDR 8
398 int (*init_state)(struct xfrm_state *x);
399 void (*destructor)(struct xfrm_state *);
400 int (*input)(struct xfrm_state *, struct sk_buff *skb);
401 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
402 int (*reject)(struct xfrm_state *, struct sk_buff *,
403 const struct flowi *);
406 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
407 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
409 struct xfrm_type_offload {
410 struct module *owner;
412 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
413 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
414 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
417 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
418 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
420 static inline int xfrm_af2proto(unsigned int family)
432 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
434 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
435 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
436 return &x->inner_mode;
438 return &x->inner_mode_iaf;
442 /* id in template is interpreted as:
443 * daddr - destination of tunnel, may be zero for transport mode.
444 * spi - zero to acquire spi. Not zero if spi is static, then
445 * daddr must be fixed too.
446 * proto - AH/ESP/IPCOMP
450 /* Source address of tunnel. Ignored, if it is not a tunnel. */
451 xfrm_address_t saddr;
453 unsigned short encap_family;
457 /* Mode: transport, tunnel etc. */
460 /* Sharing mode: unique, this session only, this user only etc. */
463 /* May skip this transfomration if no SA is found */
466 /* Skip aalgos/ealgos/calgos checks. */
469 /* Bit mask of algos allowed for acquisition */
475 #define XFRM_MAX_DEPTH 6
476 #define XFRM_MAX_OFFLOAD_DEPTH 1
478 struct xfrm_policy_walk_entry {
479 struct list_head all;
483 struct xfrm_policy_walk {
484 struct xfrm_policy_walk_entry walk;
489 struct xfrm_policy_queue {
490 struct sk_buff_head hold_queue;
491 struct timer_list hold_timer;
492 unsigned long timeout;
496 possible_net_t xp_net;
497 struct hlist_node bydst;
498 struct hlist_node byidx;
500 /* This lock only affects elements except for entry. */
504 struct timer_list timer;
510 struct xfrm_mark mark;
511 struct xfrm_selector selector;
512 struct xfrm_lifetime_cfg lft;
513 struct xfrm_lifetime_cur curlft;
514 struct xfrm_policy_walk_entry walk;
515 struct xfrm_policy_queue polq;
522 struct xfrm_sec_ctx *security;
523 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
524 struct hlist_node bydst_inexact_list;
528 static inline struct net *xp_net(const struct xfrm_policy *xp)
530 return read_pnet(&xp->xp_net);
533 struct xfrm_kmaddress {
534 xfrm_address_t local;
535 xfrm_address_t remote;
540 struct xfrm_migrate {
541 xfrm_address_t old_daddr;
542 xfrm_address_t old_saddr;
543 xfrm_address_t new_daddr;
544 xfrm_address_t new_saddr;
553 #define XFRM_KM_TIMEOUT 30
555 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
556 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
558 /* default aevent timeout in units of 100ms */
559 #define XFRM_AE_ETIME 10
560 /* Async Event timer multiplier */
561 #define XFRM_AE_ETH_M 10
562 /* default seq threshold size */
563 #define XFRM_AE_SEQT_SIZE 2
566 struct list_head list;
567 int (*notify)(struct xfrm_state *x, const struct km_event *c);
568 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
569 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
570 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
571 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
572 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
573 int (*migrate)(const struct xfrm_selector *sel,
575 const struct xfrm_migrate *m,
577 const struct xfrm_kmaddress *k,
578 const struct xfrm_encap_tmpl *encap);
579 bool (*is_alive)(const struct km_event *c);
582 int xfrm_register_km(struct xfrm_mgr *km);
583 int xfrm_unregister_km(struct xfrm_mgr *km);
585 struct xfrm_tunnel_skb_cb {
587 struct inet_skb_parm h4;
588 struct inet6_skb_parm h6;
592 struct ip_tunnel *ip4;
597 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
600 * This structure is used for the duration where packets are being
601 * transformed by IPsec. As soon as the packet leaves IPsec the
602 * area beyond the generic IP part may be overwritten.
605 struct xfrm_tunnel_skb_cb header;
607 /* Sequence number for replay protection. */
620 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
623 * This structure is used by the afinfo prepare_input/prepare_output functions
624 * to transmit header information to the mode input/output functions.
626 struct xfrm_mode_skb_cb {
627 struct xfrm_tunnel_skb_cb header;
629 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
633 /* IP header length (excluding options or extension headers). */
636 /* TOS for IPv4, class for IPv6. */
639 /* TTL for IPv4, hop limitfor IPv6. */
642 /* Protocol for IPv4, NH for IPv6. */
645 /* Option length for IPv4, zero for IPv6. */
648 /* Used by IPv6 only, zero for IPv4. */
652 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
655 * This structure is used by the input processing to locate the SPI and
656 * related information.
658 struct xfrm_spi_skb_cb {
659 struct xfrm_tunnel_skb_cb header;
661 unsigned int daddroff;
666 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
668 #ifdef CONFIG_AUDITSYSCALL
669 static inline struct audit_buffer *xfrm_audit_start(const char *op)
671 struct audit_buffer *audit_buf = NULL;
673 if (audit_enabled == AUDIT_OFF)
675 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
676 AUDIT_MAC_IPSEC_EVENT);
677 if (audit_buf == NULL)
679 audit_log_format(audit_buf, "op=%s", op);
683 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
684 struct audit_buffer *audit_buf)
686 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
687 audit_get_loginuid(current) :
689 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
692 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
693 audit_log_task_context(audit_buf);
696 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
697 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
699 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
700 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
701 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
702 struct sk_buff *skb);
703 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
705 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
706 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
708 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
712 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
717 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
722 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
727 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
732 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
737 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
738 struct sk_buff *skb, __be32 net_seq)
742 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
747 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
748 __be32 net_spi, __be32 net_seq)
752 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
753 struct sk_buff *skb, u8 proto)
756 #endif /* CONFIG_AUDITSYSCALL */
758 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
760 if (likely(policy != NULL))
761 refcount_inc(&policy->refcnt);
764 void xfrm_policy_destroy(struct xfrm_policy *policy);
766 static inline void xfrm_pol_put(struct xfrm_policy *policy)
768 if (refcount_dec_and_test(&policy->refcnt))
769 xfrm_policy_destroy(policy);
772 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
775 for (i = npols - 1; i >= 0; --i)
776 xfrm_pol_put(pols[i]);
779 void __xfrm_state_destroy(struct xfrm_state *, bool);
781 static inline void __xfrm_state_put(struct xfrm_state *x)
783 refcount_dec(&x->refcnt);
786 static inline void xfrm_state_put(struct xfrm_state *x)
788 if (refcount_dec_and_test(&x->refcnt))
789 __xfrm_state_destroy(x, false);
792 static inline void xfrm_state_put_sync(struct xfrm_state *x)
794 if (refcount_dec_and_test(&x->refcnt))
795 __xfrm_state_destroy(x, true);
798 static inline void xfrm_state_hold(struct xfrm_state *x)
800 refcount_inc(&x->refcnt);
803 static inline bool addr_match(const void *token1, const void *token2,
804 unsigned int prefixlen)
806 const __be32 *a1 = token1;
807 const __be32 *a2 = token2;
811 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
812 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
815 if (memcmp(a1, a2, pdw << 2))
821 mask = htonl((0xffffffff) << (32 - pbi));
823 if ((a1[pdw] ^ a2[pdw]) & mask)
830 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
832 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
833 if (sizeof(long) == 4 && prefixlen == 0)
835 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
839 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
842 switch(fl->flowi_proto) {
845 case IPPROTO_UDPLITE:
847 port = uli->ports.sport;
851 port = htons(uli->icmpt.type);
854 port = htons(uli->mht.type);
857 port = htons(ntohl(uli->gre_key) >> 16);
866 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
869 switch(fl->flowi_proto) {
872 case IPPROTO_UDPLITE:
874 port = uli->ports.dport;
878 port = htons(uli->icmpt.code);
881 port = htons(ntohl(uli->gre_key) & 0xffff);
889 bool xfrm_selector_match(const struct xfrm_selector *sel,
890 const struct flowi *fl, unsigned short family);
892 #ifdef CONFIG_SECURITY_NETWORK_XFRM
893 /* If neither has a context --> match
894 * Otherwise, both must have a context and the sids, doi, alg must match
896 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
898 return ((!s1 && !s2) ||
900 (s1->ctx_sid == s2->ctx_sid) &&
901 (s1->ctx_doi == s2->ctx_doi) &&
902 (s1->ctx_alg == s2->ctx_alg)));
905 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
911 /* A struct encoding bundle of transformations to apply to some set of flow.
913 * xdst->child points to the next element of bundle.
914 * dst->xfrm points to an instanse of transformer.
916 * Due to unfortunate limitations of current routing cache, which we
917 * have no time to fix, it mirrors struct rtable and bound to the same
918 * routing key, including saddr,daddr. However, we can have many of
919 * bundles differing by session id. All the bundles grow from a parent
924 struct dst_entry dst;
928 struct dst_entry *route;
929 struct dst_entry *child;
930 struct dst_entry *path;
931 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
932 int num_pols, num_xfrms;
935 u32 route_mtu_cached;
936 u32 child_mtu_cached;
941 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
944 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
945 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
950 return (struct dst_entry *) dst;
953 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
956 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
957 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
965 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
970 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
972 xfrm_pols_put(xdst->pols, xdst->num_pols);
973 dst_release(xdst->route);
974 if (likely(xdst->u.dst.xfrm))
975 xfrm_state_put(xdst->u.dst.xfrm);
979 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
981 struct xfrm_if_parms {
982 int link; /* ifindex of underlying L2 interface */
983 u32 if_id; /* interface identifyer */
987 struct xfrm_if __rcu *next; /* next interface in list */
988 struct net_device *dev; /* virtual device associated with interface */
989 struct net *net; /* netns for packet i/o */
990 struct xfrm_if_parms p; /* interface parms */
992 struct gro_cells gro_cells;
995 struct xfrm_offload {
996 /* Output sequence number for replay protection on offloading. */
1003 #define SA_DELETE_REQ 1
1004 #define CRYPTO_DONE 2
1005 #define CRYPTO_NEXT_DONE 4
1006 #define CRYPTO_FALLBACK 8
1007 #define XFRM_GSO_SEGMENT 16
1009 #define XFRM_ESP_NO_TRAILER 64
1010 #define XFRM_DEV_RESUME 128
1011 #define XFRM_XMIT 256
1014 #define CRYPTO_SUCCESS 1
1015 #define CRYPTO_GENERIC_ERROR 2
1016 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1017 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1018 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1019 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1020 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1021 #define CRYPTO_INVALID_PROTOCOL 128
1031 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1032 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1035 struct sec_path *secpath_set(struct sk_buff *skb);
1038 secpath_reset(struct sk_buff *skb)
1041 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1046 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1050 return addr->a4 == 0;
1052 return ipv6_addr_any(&addr->in6);
1058 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1060 return (tmpl->saddr.a4 &&
1061 tmpl->saddr.a4 != x->props.saddr.a4);
1065 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1067 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1068 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1072 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1076 return __xfrm4_state_addr_cmp(tmpl, x);
1078 return __xfrm6_state_addr_cmp(tmpl, x);
1084 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1085 unsigned short family);
1087 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1090 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1091 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1096 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1097 struct sk_buff *skb,
1098 unsigned int family, int reverse)
1100 struct net *net = dev_net(skb->dev);
1101 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1103 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1104 return __xfrm_policy_check(sk, ndir, skb, family);
1106 return __xfrm_check_nopolicy(net, skb, dir) ||
1107 (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) ||
1108 __xfrm_policy_check(sk, ndir, skb, family);
1111 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1113 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1116 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1118 return xfrm_policy_check(sk, dir, skb, AF_INET);
1121 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1123 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1126 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1127 struct sk_buff *skb)
1129 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1132 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1133 struct sk_buff *skb)
1135 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1138 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1139 unsigned int family, int reverse);
1141 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1142 unsigned int family)
1144 return __xfrm_decode_session(skb, fl, family, 0);
1147 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1149 unsigned int family)
1151 return __xfrm_decode_session(skb, fl, family, 1);
1154 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1156 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1158 struct net *net = dev_net(skb->dev);
1160 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1161 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1164 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1165 __xfrm_route_forward(skb, family);
1168 static inline int xfrm4_route_forward(struct sk_buff *skb)
1170 return xfrm_route_forward(skb, AF_INET);
1173 static inline int xfrm6_route_forward(struct sk_buff *skb)
1175 return xfrm_route_forward(skb, AF_INET6);
1178 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1180 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1182 sk->sk_policy[0] = NULL;
1183 sk->sk_policy[1] = NULL;
1184 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1185 return __xfrm_sk_clone_policy(sk, osk);
1189 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1191 static inline void xfrm_sk_free_policy(struct sock *sk)
1193 struct xfrm_policy *pol;
1195 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1196 if (unlikely(pol != NULL)) {
1197 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1198 sk->sk_policy[0] = NULL;
1200 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1201 if (unlikely(pol != NULL)) {
1202 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1203 sk->sk_policy[1] = NULL;
1209 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1210 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1211 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1212 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1213 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1217 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1221 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1225 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1227 unsigned int family)
1231 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1232 struct sk_buff *skb)
1236 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1237 struct sk_buff *skb)
1244 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1248 return (xfrm_address_t *)&fl->u.ip4.daddr;
1250 return (xfrm_address_t *)&fl->u.ip6.daddr;
1256 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1260 return (xfrm_address_t *)&fl->u.ip4.saddr;
1262 return (xfrm_address_t *)&fl->u.ip6.saddr;
1268 void xfrm_flowi_addr_get(const struct flowi *fl,
1269 xfrm_address_t *saddr, xfrm_address_t *daddr,
1270 unsigned short family)
1274 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1275 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1278 saddr->in6 = fl->u.ip6.saddr;
1279 daddr->in6 = fl->u.ip6.daddr;
1284 static __inline__ int
1285 __xfrm4_state_addr_check(const struct xfrm_state *x,
1286 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1288 if (daddr->a4 == x->id.daddr.a4 &&
1289 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1294 static __inline__ int
1295 __xfrm6_state_addr_check(const struct xfrm_state *x,
1296 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1298 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1299 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1300 ipv6_addr_any((struct in6_addr *)saddr) ||
1301 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1306 static __inline__ int
1307 xfrm_state_addr_check(const struct xfrm_state *x,
1308 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1309 unsigned short family)
1313 return __xfrm4_state_addr_check(x, daddr, saddr);
1315 return __xfrm6_state_addr_check(x, daddr, saddr);
1320 static __inline__ int
1321 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1322 unsigned short family)
1326 return __xfrm4_state_addr_check(x,
1327 (const xfrm_address_t *)&fl->u.ip4.daddr,
1328 (const xfrm_address_t *)&fl->u.ip4.saddr);
1330 return __xfrm6_state_addr_check(x,
1331 (const xfrm_address_t *)&fl->u.ip6.daddr,
1332 (const xfrm_address_t *)&fl->u.ip6.saddr);
1337 static inline int xfrm_state_kern(const struct xfrm_state *x)
1339 return atomic_read(&x->tunnel_users);
1342 static inline bool xfrm_id_proto_valid(u8 proto)
1348 #if IS_ENABLED(CONFIG_IPV6)
1349 case IPPROTO_ROUTING:
1350 case IPPROTO_DSTOPTS:
1358 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1359 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1361 return (!userproto || proto == userproto ||
1362 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1363 proto == IPPROTO_ESP ||
1364 proto == IPPROTO_COMP)));
1368 * xfrm algorithm information
1370 struct xfrm_algo_aead_info {
1375 struct xfrm_algo_auth_info {
1380 struct xfrm_algo_encr_info {
1386 struct xfrm_algo_comp_info {
1390 struct xfrm_algo_desc {
1394 u8 pfkey_supported:1;
1396 struct xfrm_algo_aead_info aead;
1397 struct xfrm_algo_auth_info auth;
1398 struct xfrm_algo_encr_info encr;
1399 struct xfrm_algo_comp_info comp;
1401 struct sadb_alg desc;
1404 /* XFRM protocol handlers. */
1405 struct xfrm4_protocol {
1406 int (*handler)(struct sk_buff *skb);
1407 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1409 int (*cb_handler)(struct sk_buff *skb, int err);
1410 int (*err_handler)(struct sk_buff *skb, u32 info);
1412 struct xfrm4_protocol __rcu *next;
1416 struct xfrm6_protocol {
1417 int (*handler)(struct sk_buff *skb);
1418 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1420 int (*cb_handler)(struct sk_buff *skb, int err);
1421 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1422 u8 type, u8 code, int offset, __be32 info);
1424 struct xfrm6_protocol __rcu *next;
1428 /* XFRM tunnel handlers. */
1429 struct xfrm_tunnel {
1430 int (*handler)(struct sk_buff *skb);
1431 int (*cb_handler)(struct sk_buff *skb, int err);
1432 int (*err_handler)(struct sk_buff *skb, u32 info);
1434 struct xfrm_tunnel __rcu *next;
1438 struct xfrm6_tunnel {
1439 int (*handler)(struct sk_buff *skb);
1440 int (*cb_handler)(struct sk_buff *skb, int err);
1441 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1442 u8 type, u8 code, int offset, __be32 info);
1443 struct xfrm6_tunnel __rcu *next;
1447 void xfrm_init(void);
1448 void xfrm4_init(void);
1449 int xfrm_state_init(struct net *net);
1450 void xfrm_state_fini(struct net *net);
1451 void xfrm4_state_init(void);
1452 void xfrm4_protocol_init(void);
1454 int xfrm6_init(void);
1455 void xfrm6_fini(void);
1456 int xfrm6_state_init(void);
1457 void xfrm6_state_fini(void);
1458 int xfrm6_protocol_init(void);
1459 void xfrm6_protocol_fini(void);
1461 static inline int xfrm6_init(void)
1465 static inline void xfrm6_fini(void)
1471 #ifdef CONFIG_XFRM_STATISTICS
1472 int xfrm_proc_init(struct net *net);
1473 void xfrm_proc_fini(struct net *net);
1476 int xfrm_sysctl_init(struct net *net);
1477 #ifdef CONFIG_SYSCTL
1478 void xfrm_sysctl_fini(struct net *net);
1480 static inline void xfrm_sysctl_fini(struct net *net)
1485 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1486 struct xfrm_address_filter *filter);
1487 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1488 int (*func)(struct xfrm_state *, int, void*), void *);
1489 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1490 struct xfrm_state *xfrm_state_alloc(struct net *net);
1491 void xfrm_state_free(struct xfrm_state *x);
1492 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1493 const xfrm_address_t *saddr,
1494 const struct flowi *fl,
1495 struct xfrm_tmpl *tmpl,
1496 struct xfrm_policy *pol, int *err,
1497 unsigned short family, u32 if_id);
1498 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1499 xfrm_address_t *daddr,
1500 xfrm_address_t *saddr,
1501 unsigned short family,
1502 u8 mode, u8 proto, u32 reqid);
1503 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1504 unsigned short family);
1505 int xfrm_state_check_expire(struct xfrm_state *x);
1506 void xfrm_state_insert(struct xfrm_state *x);
1507 int xfrm_state_add(struct xfrm_state *x);
1508 int xfrm_state_update(struct xfrm_state *x);
1509 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1510 const xfrm_address_t *daddr, __be32 spi,
1511 u8 proto, unsigned short family);
1512 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1513 const xfrm_address_t *daddr,
1514 const xfrm_address_t *saddr,
1516 unsigned short family);
1517 #ifdef CONFIG_XFRM_SUB_POLICY
1518 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1519 unsigned short family);
1520 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1521 unsigned short family);
1523 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1524 int n, unsigned short family)
1528 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1529 int n, unsigned short family)
1534 struct xfrmk_sadinfo {
1535 u32 sadhcnt; /* current hash bkts */
1536 u32 sadhmcnt; /* max allowed hash bkts */
1537 u32 sadcnt; /* current running count */
1540 struct xfrmk_spdinfo {
1551 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1552 int xfrm_state_delete(struct xfrm_state *x);
1553 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1554 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1555 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1556 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1557 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1558 int xfrm_init_replay(struct xfrm_state *x);
1559 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1560 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1561 int xfrm_init_state(struct xfrm_state *x);
1562 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1563 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1564 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1565 int (*finish)(struct net *, struct sock *,
1567 int xfrm_trans_queue(struct sk_buff *skb,
1568 int (*finish)(struct net *, struct sock *,
1570 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1571 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1573 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1574 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1577 void xfrm_local_error(struct sk_buff *skb, int mtu);
1578 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1579 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1581 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1582 int xfrm4_rcv(struct sk_buff *skb);
1584 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1586 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1587 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1588 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1589 return xfrm_input(skb, nexthdr, spi, 0);
1592 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1593 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1594 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1595 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1596 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1597 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1598 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1599 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1601 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1603 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1604 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1605 int xfrm6_rcv(struct sk_buff *skb);
1606 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1607 xfrm_address_t *saddr, u8 proto);
1608 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1609 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1610 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1611 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1612 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1613 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1614 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1615 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1618 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1619 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1620 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1621 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1624 static inline int xfrm_user_policy(struct sock *sk, int optname,
1625 sockptr_t optval, int optlen)
1627 return -ENOPROTOOPT;
1631 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1632 const xfrm_address_t *saddr,
1633 const xfrm_address_t *daddr,
1634 int family, u32 mark);
1636 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1638 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1639 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1640 int (*func)(struct xfrm_policy *, int, int, void*),
1642 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1643 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1644 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1645 const struct xfrm_mark *mark,
1646 u32 if_id, u8 type, int dir,
1647 struct xfrm_selector *sel,
1648 struct xfrm_sec_ctx *ctx, int delete,
1650 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1651 const struct xfrm_mark *mark, u32 if_id,
1652 u8 type, int dir, u32 id, int delete,
1654 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1655 void xfrm_policy_hash_rebuild(struct net *net);
1656 u32 xfrm_get_acqseq(void);
1657 int verify_spi_info(u8 proto, u32 min, u32 max);
1658 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1659 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1660 u8 mode, u32 reqid, u32 if_id, u8 proto,
1661 const xfrm_address_t *daddr,
1662 const xfrm_address_t *saddr, int create,
1663 unsigned short family);
1664 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1666 #ifdef CONFIG_XFRM_MIGRATE
1667 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1668 const struct xfrm_migrate *m, int num_bundles,
1669 const struct xfrm_kmaddress *k,
1670 const struct xfrm_encap_tmpl *encap);
1671 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1673 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1674 struct xfrm_migrate *m,
1675 struct xfrm_encap_tmpl *encap);
1676 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1677 struct xfrm_migrate *m, int num_bundles,
1678 struct xfrm_kmaddress *k, struct net *net,
1679 struct xfrm_encap_tmpl *encap, u32 if_id);
1682 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1683 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1684 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1685 xfrm_address_t *addr);
1687 void xfrm_input_init(void);
1688 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1690 void xfrm_probe_algs(void);
1691 int xfrm_count_pfkey_auth_supported(void);
1692 int xfrm_count_pfkey_enc_supported(void);
1693 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1694 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1695 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1696 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1697 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1698 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1699 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1700 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1701 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1704 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1705 const xfrm_address_t *b)
1707 return ipv6_addr_equal((const struct in6_addr *)a,
1708 (const struct in6_addr *)b);
1711 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1712 const xfrm_address_t *b,
1718 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1720 return xfrm6_addr_equal(a, b);
1724 static inline int xfrm_policy_id2dir(u32 index)
1730 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1731 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1732 void xfrm_replay_notify(struct xfrm_state *x, int event);
1733 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1734 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1736 static inline int xfrm_aevent_is_on(struct net *net)
1742 nlsk = rcu_dereference(net->xfrm.nlsk);
1744 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1749 static inline int xfrm_acquire_is_on(struct net *net)
1755 nlsk = rcu_dereference(net->xfrm.nlsk);
1757 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1764 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1766 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1769 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1771 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1774 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1776 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1779 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1781 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1784 #ifdef CONFIG_XFRM_MIGRATE
1785 static inline int xfrm_replay_clone(struct xfrm_state *x,
1786 struct xfrm_state *orig)
1789 x->replay_esn = kmemdup(orig->replay_esn,
1790 xfrm_replay_state_esn_len(orig->replay_esn),
1794 x->preplay_esn = kmemdup(orig->preplay_esn,
1795 xfrm_replay_state_esn_len(orig->preplay_esn),
1797 if (!x->preplay_esn)
1803 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1805 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1809 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1811 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1814 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1816 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1819 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1822 for (i = 0; i < n; i++)
1823 xfrm_state_put(*(states + i));
1826 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1829 for (i = 0; i < n; i++)
1830 xfrm_state_delete(*(states + i));
1835 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1837 struct sec_path *sp = skb_sec_path(skb);
1839 return sp->xvec[sp->len - 1];
1843 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1846 struct sec_path *sp = skb_sec_path(skb);
1848 if (!sp || !sp->olen || sp->len != sp->olen)
1851 return &sp->ovec[sp->olen - 1];
1857 void __init xfrm_dev_init(void);
1859 #ifdef CONFIG_XFRM_OFFLOAD
1860 void xfrm_dev_resume(struct sk_buff *skb);
1861 void xfrm_dev_backlog(struct softnet_data *sd);
1862 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1863 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1864 struct xfrm_user_offload *xuo);
1865 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1867 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1869 struct xfrm_state_offload *xso = &x->xso;
1871 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1872 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1875 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1877 struct xfrm_state *x = dst->xfrm;
1878 struct xfrm_dst *xdst;
1880 if (!x || !x->type_offload)
1883 xdst = (struct xfrm_dst *) dst;
1884 if (!x->xso.offload_handle && !xdst->child->xfrm)
1886 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1893 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1895 struct xfrm_state_offload *xso = &x->xso;
1898 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1901 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1903 struct xfrm_state_offload *xso = &x->xso;
1904 struct net_device *dev = xso->dev;
1906 if (dev && dev->xfrmdev_ops) {
1907 if (dev->xfrmdev_ops->xdo_dev_state_free)
1908 dev->xfrmdev_ops->xdo_dev_state_free(x);
1910 dev_put_track(dev, &xso->dev_tracker);
1914 static inline void xfrm_dev_resume(struct sk_buff *skb)
1918 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1922 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1927 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1932 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1936 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1940 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1945 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1949 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1955 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1957 if (attrs[XFRMA_MARK])
1958 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1965 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1970 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1974 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1976 struct xfrm_mark *m = &x->props.smark;
1978 return (m->v & m->m) | (mark & ~m->m);
1981 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1986 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1990 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1991 unsigned int family)
1993 bool tunnel = false;
1997 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2001 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2005 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2011 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2012 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2014 struct xfrm_translator {
2015 /* Allocate frag_list and put compat translation there */
2016 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2018 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2019 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2020 int maxtype, const struct nla_policy *policy,
2021 struct netlink_ext_ack *extack);
2023 /* Translate 32-bit user_policy from sockptr */
2024 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2026 struct module *owner;
2029 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2030 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2031 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2032 extern struct xfrm_translator *xfrm_get_translator(void);
2033 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2035 static inline struct xfrm_translator *xfrm_get_translator(void)
2039 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2044 #if IS_ENABLED(CONFIG_IPV6)
2045 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2049 if (!sk || sk->sk_family != AF_INET6)
2052 proto = sk->sk_protocol;
2053 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2054 return inet6_sk(sk)->dontfrag;
2059 #endif /* _NET_XFRM_H */