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>
22 #include <net/route.h>
24 #include <net/ip6_fib.h>
26 #include <net/gro_cells.h>
28 #include <linux/interrupt.h>
30 #ifdef CONFIG_XFRM_STATISTICS
34 #define XFRM_PROTO_ESP 50
35 #define XFRM_PROTO_AH 51
36 #define XFRM_PROTO_COMP 108
37 #define XFRM_PROTO_IPIP 4
38 #define XFRM_PROTO_IPV6 41
39 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
40 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
42 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
43 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
44 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
45 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
46 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
47 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
48 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
49 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51 #ifdef CONFIG_XFRM_STATISTICS
52 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54 #define XFRM_INC_STATS(net, field) ((void)(net))
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72 Lookup is plain linear search until the first match with selector.
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
86 Bundles are cached at xrfm_policy struct (field ->bundles).
89 Resolution of xrfm_tmpl
90 -----------------------
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
119 struct xfrm_state_walk {
120 struct list_head all;
125 struct xfrm_address_filter *filter;
128 struct xfrm_state_offload {
129 struct net_device *dev;
130 unsigned long offload_handle;
131 unsigned int num_exthdrs;
141 /* Flags for xfrm_mode. */
143 XFRM_MODE_FLAG_TUNNEL = 1,
146 /* Full description of state of transformer. */
148 possible_net_t xs_net;
150 struct hlist_node gclist;
151 struct hlist_node bydst;
153 struct hlist_node bysrc;
154 struct hlist_node byspi;
160 struct xfrm_selector sel;
161 struct xfrm_mark mark;
167 /* Key manager bits */
168 struct xfrm_state_walk km;
170 /* Parameters of this state. */
175 u8 aalgo, ealgo, calgo;
178 xfrm_address_t saddr;
182 struct xfrm_mark smark;
185 struct xfrm_lifetime_cfg lft;
187 /* Data for transformer */
188 struct xfrm_algo_auth *aalg;
189 struct xfrm_algo *ealg;
190 struct xfrm_algo *calg;
191 struct xfrm_algo_aead *aead;
194 /* Data for encapsulator */
195 struct xfrm_encap_tmpl *encap;
196 struct sock __rcu *encap_sk;
198 /* Data for care-of address */
199 xfrm_address_t *coaddr;
201 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
202 struct xfrm_state *tunnel;
204 /* If a tunnel, number of users + 1 */
205 atomic_t tunnel_users;
207 /* State for replay detection */
208 struct xfrm_replay_state replay;
209 struct xfrm_replay_state_esn *replay_esn;
211 /* Replay detection state at the time we sent the last notification */
212 struct xfrm_replay_state preplay;
213 struct xfrm_replay_state_esn *preplay_esn;
215 /* The functions for replay detection. */
216 const struct xfrm_replay *repl;
218 /* internal flag that only holds state for delayed aevent at the
223 /* Replay detection notification settings */
227 /* Replay detection notification timer */
228 struct timer_list rtimer;
231 struct xfrm_stats stats;
233 struct xfrm_lifetime_cur curlft;
234 struct hrtimer mtimer;
236 struct xfrm_state_offload xso;
238 /* used to fix curlft->add_time when changing date */
244 struct page_frag xfrag;
246 /* Reference to data common to all the instances of this
248 const struct xfrm_type *type;
249 struct xfrm_mode inner_mode;
250 struct xfrm_mode inner_mode_iaf;
251 struct xfrm_mode outer_mode;
253 const struct xfrm_type_offload *type_offload;
255 /* Security context */
256 struct xfrm_sec_ctx *security;
258 /* Private data of this transformer, format is opaque,
259 * interpreted by xfrm_type methods. */
263 static inline struct net *xs_net(struct xfrm_state *x)
265 return read_pnet(&x->xs_net);
268 /* xflags - make enum if more show up */
269 #define XFRM_TIME_DEFER 1
270 #define XFRM_SOFT_EXPIRE 2
281 /* callback structure passed from either netlink or pfkey */
298 void (*advance)(struct xfrm_state *x, __be32 net_seq);
299 int (*check)(struct xfrm_state *x,
302 int (*recheck)(struct xfrm_state *x,
305 void (*notify)(struct xfrm_state *x, int event);
306 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
310 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
311 unsigned short family);
314 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
315 void xfrm_if_unregister_cb(void);
320 struct xfrm_policy_afinfo {
321 struct dst_ops *dst_ops;
322 struct dst_entry *(*dst_lookup)(struct net *net,
324 const xfrm_address_t *saddr,
325 const xfrm_address_t *daddr,
327 int (*get_saddr)(struct net *net, int oif,
328 xfrm_address_t *saddr,
329 xfrm_address_t *daddr,
331 int (*fill_dst)(struct xfrm_dst *xdst,
332 struct net_device *dev,
333 const struct flowi *fl);
334 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
337 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
338 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
339 void km_policy_notify(struct xfrm_policy *xp, int dir,
340 const struct km_event *c);
341 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
344 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
345 struct xfrm_policy *pol);
346 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
347 int __xfrm_state_delete(struct xfrm_state *x);
349 struct xfrm_state_afinfo {
353 const struct xfrm_type_offload *type_offload_esp;
355 const struct xfrm_type *type_esp;
356 const struct xfrm_type *type_ipip;
357 const struct xfrm_type *type_ipip6;
358 const struct xfrm_type *type_comp;
359 const struct xfrm_type *type_ah;
360 const struct xfrm_type *type_routing;
361 const struct xfrm_type *type_dstopts;
363 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
364 int (*transport_finish)(struct sk_buff *skb,
366 void (*local_error)(struct sk_buff *skb, u32 mtu);
369 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
370 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
371 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
372 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
374 struct xfrm_input_afinfo {
376 int (*callback)(struct sk_buff *skb, u8 protocol,
380 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
381 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
383 void xfrm_flush_gc(void);
384 void xfrm_state_delete_tunnel(struct xfrm_state *x);
388 struct module *owner;
391 #define XFRM_TYPE_NON_FRAGMENT 1
392 #define XFRM_TYPE_REPLAY_PROT 2
393 #define XFRM_TYPE_LOCAL_COADDR 4
394 #define XFRM_TYPE_REMOTE_COADDR 8
396 int (*init_state)(struct xfrm_state *x);
397 void (*destructor)(struct xfrm_state *);
398 int (*input)(struct xfrm_state *, struct sk_buff *skb);
399 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
400 int (*reject)(struct xfrm_state *, struct sk_buff *,
401 const struct flowi *);
402 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
405 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
406 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
408 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)
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)
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
1013 #define CRYPTO_SUCCESS 1
1014 #define CRYPTO_GENERIC_ERROR 2
1015 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1016 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1017 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1018 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1019 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1020 #define CRYPTO_INVALID_PROTOCOL 128
1029 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1030 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1033 struct sec_path *secpath_set(struct sk_buff *skb);
1036 secpath_reset(struct sk_buff *skb)
1039 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1044 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1048 return addr->a4 == 0;
1050 return ipv6_addr_any(&addr->in6);
1056 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1058 return (tmpl->saddr.a4 &&
1059 tmpl->saddr.a4 != x->props.saddr.a4);
1063 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1065 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1066 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1070 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1074 return __xfrm4_state_addr_cmp(tmpl, x);
1076 return __xfrm6_state_addr_cmp(tmpl, x);
1082 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1083 unsigned short family);
1085 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1086 struct sk_buff *skb,
1087 unsigned int family, int reverse)
1089 struct net *net = dev_net(skb->dev);
1090 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1092 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1093 return __xfrm_policy_check(sk, ndir, skb, family);
1095 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1096 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1097 __xfrm_policy_check(sk, ndir, skb, family);
1100 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1102 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1105 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1107 return xfrm_policy_check(sk, dir, skb, AF_INET);
1110 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1112 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1115 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1116 struct sk_buff *skb)
1118 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1121 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1122 struct sk_buff *skb)
1124 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1127 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1128 unsigned int family, int reverse);
1130 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1131 unsigned int family)
1133 return __xfrm_decode_session(skb, fl, family, 0);
1136 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1138 unsigned int family)
1140 return __xfrm_decode_session(skb, fl, family, 1);
1143 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1145 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1147 struct net *net = dev_net(skb->dev);
1149 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1150 (skb_dst(skb)->flags & DST_NOXFRM) ||
1151 __xfrm_route_forward(skb, family);
1154 static inline int xfrm4_route_forward(struct sk_buff *skb)
1156 return xfrm_route_forward(skb, AF_INET);
1159 static inline int xfrm6_route_forward(struct sk_buff *skb)
1161 return xfrm_route_forward(skb, AF_INET6);
1164 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1166 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1168 sk->sk_policy[0] = NULL;
1169 sk->sk_policy[1] = NULL;
1170 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1171 return __xfrm_sk_clone_policy(sk, osk);
1175 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1177 static inline void xfrm_sk_free_policy(struct sock *sk)
1179 struct xfrm_policy *pol;
1181 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1182 if (unlikely(pol != NULL)) {
1183 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1184 sk->sk_policy[0] = NULL;
1186 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1187 if (unlikely(pol != NULL)) {
1188 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1189 sk->sk_policy[1] = NULL;
1195 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1196 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1197 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1198 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1199 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1203 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1207 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1211 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1213 unsigned int family)
1217 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1218 struct sk_buff *skb)
1222 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1223 struct sk_buff *skb)
1230 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1234 return (xfrm_address_t *)&fl->u.ip4.daddr;
1236 return (xfrm_address_t *)&fl->u.ip6.daddr;
1242 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1246 return (xfrm_address_t *)&fl->u.ip4.saddr;
1248 return (xfrm_address_t *)&fl->u.ip6.saddr;
1254 void xfrm_flowi_addr_get(const struct flowi *fl,
1255 xfrm_address_t *saddr, xfrm_address_t *daddr,
1256 unsigned short family)
1260 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1261 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1264 saddr->in6 = fl->u.ip6.saddr;
1265 daddr->in6 = fl->u.ip6.daddr;
1270 static __inline__ int
1271 __xfrm4_state_addr_check(const struct xfrm_state *x,
1272 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1274 if (daddr->a4 == x->id.daddr.a4 &&
1275 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1280 static __inline__ int
1281 __xfrm6_state_addr_check(const struct xfrm_state *x,
1282 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1284 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1285 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1286 ipv6_addr_any((struct in6_addr *)saddr) ||
1287 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1292 static __inline__ int
1293 xfrm_state_addr_check(const struct xfrm_state *x,
1294 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1295 unsigned short family)
1299 return __xfrm4_state_addr_check(x, daddr, saddr);
1301 return __xfrm6_state_addr_check(x, daddr, saddr);
1306 static __inline__ int
1307 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1308 unsigned short family)
1312 return __xfrm4_state_addr_check(x,
1313 (const xfrm_address_t *)&fl->u.ip4.daddr,
1314 (const xfrm_address_t *)&fl->u.ip4.saddr);
1316 return __xfrm6_state_addr_check(x,
1317 (const xfrm_address_t *)&fl->u.ip6.daddr,
1318 (const xfrm_address_t *)&fl->u.ip6.saddr);
1323 static inline int xfrm_state_kern(const struct xfrm_state *x)
1325 return atomic_read(&x->tunnel_users);
1328 static inline bool xfrm_id_proto_valid(u8 proto)
1334 #if IS_ENABLED(CONFIG_IPV6)
1335 case IPPROTO_ROUTING:
1336 case IPPROTO_DSTOPTS:
1344 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1345 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1347 return (!userproto || proto == userproto ||
1348 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1349 proto == IPPROTO_ESP ||
1350 proto == IPPROTO_COMP)));
1354 * xfrm algorithm information
1356 struct xfrm_algo_aead_info {
1361 struct xfrm_algo_auth_info {
1366 struct xfrm_algo_encr_info {
1372 struct xfrm_algo_comp_info {
1376 struct xfrm_algo_desc {
1380 u8 pfkey_supported:1;
1382 struct xfrm_algo_aead_info aead;
1383 struct xfrm_algo_auth_info auth;
1384 struct xfrm_algo_encr_info encr;
1385 struct xfrm_algo_comp_info comp;
1387 struct sadb_alg desc;
1390 /* XFRM protocol handlers. */
1391 struct xfrm4_protocol {
1392 int (*handler)(struct sk_buff *skb);
1393 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1395 int (*cb_handler)(struct sk_buff *skb, int err);
1396 int (*err_handler)(struct sk_buff *skb, u32 info);
1398 struct xfrm4_protocol __rcu *next;
1402 struct xfrm6_protocol {
1403 int (*handler)(struct sk_buff *skb);
1404 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1406 int (*cb_handler)(struct sk_buff *skb, int err);
1407 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1408 u8 type, u8 code, int offset, __be32 info);
1410 struct xfrm6_protocol __rcu *next;
1414 /* XFRM tunnel handlers. */
1415 struct xfrm_tunnel {
1416 int (*handler)(struct sk_buff *skb);
1417 int (*err_handler)(struct sk_buff *skb, u32 info);
1419 struct xfrm_tunnel __rcu *next;
1423 struct xfrm6_tunnel {
1424 int (*handler)(struct sk_buff *skb);
1425 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1426 u8 type, u8 code, int offset, __be32 info);
1427 struct xfrm6_tunnel __rcu *next;
1431 void xfrm_init(void);
1432 void xfrm4_init(void);
1433 int xfrm_state_init(struct net *net);
1434 void xfrm_state_fini(struct net *net);
1435 void xfrm4_state_init(void);
1436 void xfrm4_protocol_init(void);
1438 int xfrm6_init(void);
1439 void xfrm6_fini(void);
1440 int xfrm6_state_init(void);
1441 void xfrm6_state_fini(void);
1442 int xfrm6_protocol_init(void);
1443 void xfrm6_protocol_fini(void);
1445 static inline int xfrm6_init(void)
1449 static inline void xfrm6_fini(void)
1455 #ifdef CONFIG_XFRM_STATISTICS
1456 int xfrm_proc_init(struct net *net);
1457 void xfrm_proc_fini(struct net *net);
1460 int xfrm_sysctl_init(struct net *net);
1461 #ifdef CONFIG_SYSCTL
1462 void xfrm_sysctl_fini(struct net *net);
1464 static inline void xfrm_sysctl_fini(struct net *net)
1469 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1470 struct xfrm_address_filter *filter);
1471 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1472 int (*func)(struct xfrm_state *, int, void*), void *);
1473 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1474 struct xfrm_state *xfrm_state_alloc(struct net *net);
1475 void xfrm_state_free(struct xfrm_state *x);
1476 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1477 const xfrm_address_t *saddr,
1478 const struct flowi *fl,
1479 struct xfrm_tmpl *tmpl,
1480 struct xfrm_policy *pol, int *err,
1481 unsigned short family, u32 if_id);
1482 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1483 xfrm_address_t *daddr,
1484 xfrm_address_t *saddr,
1485 unsigned short family,
1486 u8 mode, u8 proto, u32 reqid);
1487 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1488 unsigned short family);
1489 int xfrm_state_check_expire(struct xfrm_state *x);
1490 void xfrm_state_insert(struct xfrm_state *x);
1491 int xfrm_state_add(struct xfrm_state *x);
1492 int xfrm_state_update(struct xfrm_state *x);
1493 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1494 const xfrm_address_t *daddr, __be32 spi,
1495 u8 proto, unsigned short family);
1496 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1497 const xfrm_address_t *daddr,
1498 const xfrm_address_t *saddr,
1500 unsigned short family);
1501 #ifdef CONFIG_XFRM_SUB_POLICY
1502 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1503 unsigned short family);
1504 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1505 unsigned short family);
1507 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1508 int n, unsigned short family)
1512 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1513 int n, unsigned short family)
1518 struct xfrmk_sadinfo {
1519 u32 sadhcnt; /* current hash bkts */
1520 u32 sadhmcnt; /* max allowed hash bkts */
1521 u32 sadcnt; /* current running count */
1524 struct xfrmk_spdinfo {
1535 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1536 int xfrm_state_delete(struct xfrm_state *x);
1537 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1538 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1539 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1540 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1541 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1542 int xfrm_init_replay(struct xfrm_state *x);
1543 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1544 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1545 int xfrm_init_state(struct xfrm_state *x);
1546 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1547 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1548 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1549 int (*finish)(struct net *, struct sock *,
1551 int xfrm_trans_queue(struct sk_buff *skb,
1552 int (*finish)(struct net *, struct sock *,
1554 int xfrm_output_resume(struct sk_buff *skb, int err);
1555 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1557 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1558 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1561 void xfrm_local_error(struct sk_buff *skb, int mtu);
1562 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1563 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1565 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1566 int xfrm4_rcv(struct sk_buff *skb);
1567 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1569 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1571 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1572 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1573 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1574 return xfrm_input(skb, nexthdr, spi, 0);
1577 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1578 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1579 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1580 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1581 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1582 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1583 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1584 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1585 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1587 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1589 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1590 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1591 int xfrm6_rcv(struct sk_buff *skb);
1592 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1593 xfrm_address_t *saddr, u8 proto);
1594 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1595 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1596 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1597 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1598 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1599 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1600 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1601 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1602 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1603 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1607 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1608 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1609 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1610 int xfrm_user_policy(struct sock *sk, int optname,
1611 u8 __user *optval, int optlen);
1613 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1615 return -ENOPROTOOPT;
1619 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1620 const xfrm_address_t *saddr,
1621 const xfrm_address_t *daddr,
1622 int family, u32 mark);
1624 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1626 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1627 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1628 int (*func)(struct xfrm_policy *, int, int, void*),
1630 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1631 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1632 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1634 struct xfrm_selector *sel,
1635 struct xfrm_sec_ctx *ctx, int delete,
1637 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1638 int dir, u32 id, int delete, int *err);
1639 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1640 void xfrm_policy_hash_rebuild(struct net *net);
1641 u32 xfrm_get_acqseq(void);
1642 int verify_spi_info(u8 proto, u32 min, u32 max);
1643 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1644 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1645 u8 mode, u32 reqid, u32 if_id, u8 proto,
1646 const xfrm_address_t *daddr,
1647 const xfrm_address_t *saddr, int create,
1648 unsigned short family);
1649 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1651 #ifdef CONFIG_XFRM_MIGRATE
1652 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1653 const struct xfrm_migrate *m, int num_bundles,
1654 const struct xfrm_kmaddress *k,
1655 const struct xfrm_encap_tmpl *encap);
1656 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1657 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1658 struct xfrm_migrate *m,
1659 struct xfrm_encap_tmpl *encap);
1660 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1661 struct xfrm_migrate *m, int num_bundles,
1662 struct xfrm_kmaddress *k, struct net *net,
1663 struct xfrm_encap_tmpl *encap);
1666 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1667 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1668 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1669 xfrm_address_t *addr);
1671 void xfrm_input_init(void);
1672 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1674 void xfrm_probe_algs(void);
1675 int xfrm_count_pfkey_auth_supported(void);
1676 int xfrm_count_pfkey_enc_supported(void);
1677 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1678 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1679 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1680 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1681 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1682 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1683 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1684 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1685 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1688 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1689 const xfrm_address_t *b)
1691 return ipv6_addr_equal((const struct in6_addr *)a,
1692 (const struct in6_addr *)b);
1695 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1696 const xfrm_address_t *b,
1702 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1704 return xfrm6_addr_equal(a, b);
1708 static inline int xfrm_policy_id2dir(u32 index)
1714 static inline int xfrm_aevent_is_on(struct net *net)
1720 nlsk = rcu_dereference(net->xfrm.nlsk);
1722 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1727 static inline int xfrm_acquire_is_on(struct net *net)
1733 nlsk = rcu_dereference(net->xfrm.nlsk);
1735 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1742 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1744 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1747 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1749 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1752 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1754 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1757 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1759 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1762 #ifdef CONFIG_XFRM_MIGRATE
1763 static inline int xfrm_replay_clone(struct xfrm_state *x,
1764 struct xfrm_state *orig)
1766 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1771 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1772 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1774 x->preplay_esn = kmemdup(x->replay_esn,
1775 xfrm_replay_state_esn_len(x->replay_esn),
1777 if (!x->preplay_esn) {
1778 kfree(x->replay_esn);
1785 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1787 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1791 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1793 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1796 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1798 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1801 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1804 for (i = 0; i < n; i++)
1805 xfrm_state_put(*(states + i));
1808 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1811 for (i = 0; i < n; i++)
1812 xfrm_state_delete(*(states + i));
1817 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1819 struct sec_path *sp = skb_sec_path(skb);
1821 return sp->xvec[sp->len - 1];
1825 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1828 struct sec_path *sp = skb_sec_path(skb);
1830 if (!sp || !sp->olen || sp->len != sp->olen)
1833 return &sp->ovec[sp->olen - 1];
1839 void __init xfrm_dev_init(void);
1841 #ifdef CONFIG_XFRM_OFFLOAD
1842 void xfrm_dev_resume(struct sk_buff *skb);
1843 void xfrm_dev_backlog(struct softnet_data *sd);
1844 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1845 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1846 struct xfrm_user_offload *xuo);
1847 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1849 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1851 struct xfrm_state_offload *xso = &x->xso;
1853 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1854 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1857 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1859 struct xfrm_state *x = dst->xfrm;
1860 struct xfrm_dst *xdst;
1862 if (!x || !x->type_offload)
1865 xdst = (struct xfrm_dst *) dst;
1866 if (!x->xso.offload_handle && !xdst->child->xfrm)
1868 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1875 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1877 struct xfrm_state_offload *xso = &x->xso;
1880 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1883 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1885 struct xfrm_state_offload *xso = &x->xso;
1886 struct net_device *dev = xso->dev;
1888 if (dev && dev->xfrmdev_ops) {
1889 if (dev->xfrmdev_ops->xdo_dev_state_free)
1890 dev->xfrmdev_ops->xdo_dev_state_free(x);
1896 static inline void xfrm_dev_resume(struct sk_buff *skb)
1900 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1904 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1909 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1914 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1918 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1922 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1927 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1931 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1937 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1939 if (attrs[XFRMA_MARK])
1940 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1947 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1952 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1956 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1958 struct xfrm_mark *m = &x->props.smark;
1960 return (m->v & m->m) | (mark & ~m->m);
1963 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1968 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1972 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1973 unsigned int family)
1975 bool tunnel = false;
1979 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1983 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1987 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1993 #if IS_ENABLED(CONFIG_IPV6)
1994 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
1998 if (!sk || sk->sk_family != AF_INET6)
2001 proto = sk->sk_protocol;
2002 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2003 return inet6_sk(sk)->dontfrag;
2008 #endif /* _NET_XFRM_H */