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 struct net_device *slave_dev;
131 unsigned long offload_handle;
132 unsigned int num_exthdrs;
142 /* Flags for xfrm_mode. */
144 XFRM_MODE_FLAG_TUNNEL = 1,
147 /* Full description of state of transformer. */
149 possible_net_t xs_net;
151 struct hlist_node gclist;
152 struct hlist_node bydst;
154 struct hlist_node bysrc;
155 struct hlist_node byspi;
161 struct xfrm_selector sel;
162 struct xfrm_mark mark;
168 /* Key manager bits */
169 struct xfrm_state_walk km;
171 /* Parameters of this state. */
176 u8 aalgo, ealgo, calgo;
179 xfrm_address_t saddr;
183 struct xfrm_mark smark;
186 struct xfrm_lifetime_cfg lft;
188 /* Data for transformer */
189 struct xfrm_algo_auth *aalg;
190 struct xfrm_algo *ealg;
191 struct xfrm_algo *calg;
192 struct xfrm_algo_aead *aead;
195 /* Data for encapsulator */
196 struct xfrm_encap_tmpl *encap;
197 struct sock __rcu *encap_sk;
199 /* Data for care-of address */
200 xfrm_address_t *coaddr;
202 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
203 struct xfrm_state *tunnel;
205 /* If a tunnel, number of users + 1 */
206 atomic_t tunnel_users;
208 /* State for replay detection */
209 struct xfrm_replay_state replay;
210 struct xfrm_replay_state_esn *replay_esn;
212 /* Replay detection state at the time we sent the last notification */
213 struct xfrm_replay_state preplay;
214 struct xfrm_replay_state_esn *preplay_esn;
216 /* The functions for replay detection. */
217 const struct xfrm_replay *repl;
219 /* internal flag that only holds state for delayed aevent at the
224 /* Replay detection notification settings */
228 /* Replay detection notification timer */
229 struct timer_list rtimer;
232 struct xfrm_stats stats;
234 struct xfrm_lifetime_cur curlft;
235 struct hrtimer mtimer;
237 struct xfrm_state_offload xso;
239 /* used to fix curlft->add_time when changing date */
245 struct page_frag xfrag;
247 /* Reference to data common to all the instances of this
249 const struct xfrm_type *type;
250 struct xfrm_mode inner_mode;
251 struct xfrm_mode inner_mode_iaf;
252 struct xfrm_mode outer_mode;
254 const struct xfrm_type_offload *type_offload;
256 /* Security context */
257 struct xfrm_sec_ctx *security;
259 /* Private data of this transformer, format is opaque,
260 * interpreted by xfrm_type methods. */
264 static inline struct net *xs_net(struct xfrm_state *x)
266 return read_pnet(&x->xs_net);
269 /* xflags - make enum if more show up */
270 #define XFRM_TIME_DEFER 1
271 #define XFRM_SOFT_EXPIRE 2
282 /* callback structure passed from either netlink or pfkey */
299 void (*advance)(struct xfrm_state *x, __be32 net_seq);
300 int (*check)(struct xfrm_state *x,
303 int (*recheck)(struct xfrm_state *x,
306 void (*notify)(struct xfrm_state *x, int event);
307 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
311 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
312 unsigned short family);
315 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
316 void xfrm_if_unregister_cb(void);
321 struct xfrm_policy_afinfo {
322 struct dst_ops *dst_ops;
323 struct dst_entry *(*dst_lookup)(struct net *net,
325 const xfrm_address_t *saddr,
326 const xfrm_address_t *daddr,
328 int (*get_saddr)(struct net *net, int oif,
329 xfrm_address_t *saddr,
330 xfrm_address_t *daddr,
332 int (*fill_dst)(struct xfrm_dst *xdst,
333 struct net_device *dev,
334 const struct flowi *fl);
335 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
338 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
339 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
340 void km_policy_notify(struct xfrm_policy *xp, int dir,
341 const struct km_event *c);
342 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
345 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
346 struct xfrm_policy *pol);
347 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
348 int __xfrm_state_delete(struct xfrm_state *x);
350 struct xfrm_state_afinfo {
354 const struct xfrm_type_offload *type_offload_esp;
356 const struct xfrm_type *type_esp;
357 const struct xfrm_type *type_ipip;
358 const struct xfrm_type *type_ipip6;
359 const struct xfrm_type *type_comp;
360 const struct xfrm_type *type_ah;
361 const struct xfrm_type *type_routing;
362 const struct xfrm_type *type_dstopts;
364 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
365 int (*transport_finish)(struct sk_buff *skb,
367 void (*local_error)(struct sk_buff *skb, u32 mtu);
370 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
371 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
372 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
373 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
375 struct xfrm_input_afinfo {
378 int (*callback)(struct sk_buff *skb, u8 protocol,
382 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
383 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
385 void xfrm_flush_gc(void);
386 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 *);
404 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
407 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
408 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
410 struct xfrm_type_offload {
412 struct module *owner;
414 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
415 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
416 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
419 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
420 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
422 static inline int xfrm_af2proto(unsigned int family)
434 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
436 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
437 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
438 return &x->inner_mode;
440 return &x->inner_mode_iaf;
444 /* id in template is interpreted as:
445 * daddr - destination of tunnel, may be zero for transport mode.
446 * spi - zero to acquire spi. Not zero if spi is static, then
447 * daddr must be fixed too.
448 * proto - AH/ESP/IPCOMP
452 /* Source address of tunnel. Ignored, if it is not a tunnel. */
453 xfrm_address_t saddr;
455 unsigned short encap_family;
459 /* Mode: transport, tunnel etc. */
462 /* Sharing mode: unique, this session only, this user only etc. */
465 /* May skip this transfomration if no SA is found */
468 /* Skip aalgos/ealgos/calgos checks. */
471 /* Bit mask of algos allowed for acquisition */
477 #define XFRM_MAX_DEPTH 6
478 #define XFRM_MAX_OFFLOAD_DEPTH 1
480 struct xfrm_policy_walk_entry {
481 struct list_head all;
485 struct xfrm_policy_walk {
486 struct xfrm_policy_walk_entry walk;
491 struct xfrm_policy_queue {
492 struct sk_buff_head hold_queue;
493 struct timer_list hold_timer;
494 unsigned long timeout;
498 possible_net_t xp_net;
499 struct hlist_node bydst;
500 struct hlist_node byidx;
502 /* This lock only affects elements except for entry. */
506 struct timer_list timer;
512 struct xfrm_mark mark;
513 struct xfrm_selector selector;
514 struct xfrm_lifetime_cfg lft;
515 struct xfrm_lifetime_cur curlft;
516 struct xfrm_policy_walk_entry walk;
517 struct xfrm_policy_queue polq;
524 struct xfrm_sec_ctx *security;
525 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
526 struct hlist_node bydst_inexact_list;
530 static inline struct net *xp_net(const struct xfrm_policy *xp)
532 return read_pnet(&xp->xp_net);
535 struct xfrm_kmaddress {
536 xfrm_address_t local;
537 xfrm_address_t remote;
542 struct xfrm_migrate {
543 xfrm_address_t old_daddr;
544 xfrm_address_t old_saddr;
545 xfrm_address_t new_daddr;
546 xfrm_address_t new_saddr;
555 #define XFRM_KM_TIMEOUT 30
557 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
558 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
560 /* default aevent timeout in units of 100ms */
561 #define XFRM_AE_ETIME 10
562 /* Async Event timer multiplier */
563 #define XFRM_AE_ETH_M 10
564 /* default seq threshold size */
565 #define XFRM_AE_SEQT_SIZE 2
568 struct list_head list;
569 int (*notify)(struct xfrm_state *x, const struct km_event *c);
570 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
571 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
572 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
573 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
574 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
575 int (*migrate)(const struct xfrm_selector *sel,
577 const struct xfrm_migrate *m,
579 const struct xfrm_kmaddress *k,
580 const struct xfrm_encap_tmpl *encap);
581 bool (*is_alive)(const struct km_event *c);
584 int xfrm_register_km(struct xfrm_mgr *km);
585 int xfrm_unregister_km(struct xfrm_mgr *km);
587 struct xfrm_tunnel_skb_cb {
589 struct inet_skb_parm h4;
590 struct inet6_skb_parm h6;
594 struct ip_tunnel *ip4;
599 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
602 * This structure is used for the duration where packets are being
603 * transformed by IPsec. As soon as the packet leaves IPsec the
604 * area beyond the generic IP part may be overwritten.
607 struct xfrm_tunnel_skb_cb header;
609 /* Sequence number for replay protection. */
622 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
625 * This structure is used by the afinfo prepare_input/prepare_output functions
626 * to transmit header information to the mode input/output functions.
628 struct xfrm_mode_skb_cb {
629 struct xfrm_tunnel_skb_cb header;
631 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
635 /* IP header length (excluding options or extension headers). */
638 /* TOS for IPv4, class for IPv6. */
641 /* TTL for IPv4, hop limitfor IPv6. */
644 /* Protocol for IPv4, NH for IPv6. */
647 /* Option length for IPv4, zero for IPv6. */
650 /* Used by IPv6 only, zero for IPv4. */
654 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
657 * This structure is used by the input processing to locate the SPI and
658 * related information.
660 struct xfrm_spi_skb_cb {
661 struct xfrm_tunnel_skb_cb header;
663 unsigned int daddroff;
668 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
670 #ifdef CONFIG_AUDITSYSCALL
671 static inline struct audit_buffer *xfrm_audit_start(const char *op)
673 struct audit_buffer *audit_buf = NULL;
675 if (audit_enabled == AUDIT_OFF)
677 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
678 AUDIT_MAC_IPSEC_EVENT);
679 if (audit_buf == NULL)
681 audit_log_format(audit_buf, "op=%s", op);
685 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
686 struct audit_buffer *audit_buf)
688 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
689 audit_get_loginuid(current) :
691 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
694 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
695 audit_log_task_context(audit_buf);
698 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
699 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
701 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
702 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
703 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
704 struct sk_buff *skb);
705 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
707 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
708 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
710 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
714 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
719 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
724 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
729 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
734 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
739 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
740 struct sk_buff *skb, __be32 net_seq)
744 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
749 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
750 __be32 net_spi, __be32 net_seq)
754 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
755 struct sk_buff *skb, u8 proto)
758 #endif /* CONFIG_AUDITSYSCALL */
760 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
762 if (likely(policy != NULL))
763 refcount_inc(&policy->refcnt);
766 void xfrm_policy_destroy(struct xfrm_policy *policy);
768 static inline void xfrm_pol_put(struct xfrm_policy *policy)
770 if (refcount_dec_and_test(&policy->refcnt))
771 xfrm_policy_destroy(policy);
774 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
777 for (i = npols - 1; i >= 0; --i)
778 xfrm_pol_put(pols[i]);
781 void __xfrm_state_destroy(struct xfrm_state *, bool);
783 static inline void __xfrm_state_put(struct xfrm_state *x)
785 refcount_dec(&x->refcnt);
788 static inline void xfrm_state_put(struct xfrm_state *x)
790 if (refcount_dec_and_test(&x->refcnt))
791 __xfrm_state_destroy(x, false);
794 static inline void xfrm_state_put_sync(struct xfrm_state *x)
796 if (refcount_dec_and_test(&x->refcnt))
797 __xfrm_state_destroy(x, true);
800 static inline void xfrm_state_hold(struct xfrm_state *x)
802 refcount_inc(&x->refcnt);
805 static inline bool addr_match(const void *token1, const void *token2,
806 unsigned int prefixlen)
808 const __be32 *a1 = token1;
809 const __be32 *a2 = token2;
813 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
814 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
817 if (memcmp(a1, a2, pdw << 2))
823 mask = htonl((0xffffffff) << (32 - pbi));
825 if ((a1[pdw] ^ a2[pdw]) & mask)
832 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
834 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
835 if (sizeof(long) == 4 && prefixlen == 0)
837 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
841 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
844 switch(fl->flowi_proto) {
847 case IPPROTO_UDPLITE:
849 port = uli->ports.sport;
853 port = htons(uli->icmpt.type);
856 port = htons(uli->mht.type);
859 port = htons(ntohl(uli->gre_key) >> 16);
868 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
871 switch(fl->flowi_proto) {
874 case IPPROTO_UDPLITE:
876 port = uli->ports.dport;
880 port = htons(uli->icmpt.code);
883 port = htons(ntohl(uli->gre_key) & 0xffff);
891 bool xfrm_selector_match(const struct xfrm_selector *sel,
892 const struct flowi *fl, unsigned short family);
894 #ifdef CONFIG_SECURITY_NETWORK_XFRM
895 /* If neither has a context --> match
896 * Otherwise, both must have a context and the sids, doi, alg must match
898 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
900 return ((!s1 && !s2) ||
902 (s1->ctx_sid == s2->ctx_sid) &&
903 (s1->ctx_doi == s2->ctx_doi) &&
904 (s1->ctx_alg == s2->ctx_alg)));
907 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
913 /* A struct encoding bundle of transformations to apply to some set of flow.
915 * xdst->child points to the next element of bundle.
916 * dst->xfrm points to an instanse of transformer.
918 * Due to unfortunate limitations of current routing cache, which we
919 * have no time to fix, it mirrors struct rtable and bound to the same
920 * routing key, including saddr,daddr. However, we can have many of
921 * bundles differing by session id. All the bundles grow from a parent
926 struct dst_entry dst;
930 struct dst_entry *route;
931 struct dst_entry *child;
932 struct dst_entry *path;
933 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
934 int num_pols, num_xfrms;
937 u32 route_mtu_cached;
938 u32 child_mtu_cached;
943 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
947 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
952 return (struct dst_entry *) dst;
955 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
959 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
967 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
972 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
974 xfrm_pols_put(xdst->pols, xdst->num_pols);
975 dst_release(xdst->route);
976 if (likely(xdst->u.dst.xfrm))
977 xfrm_state_put(xdst->u.dst.xfrm);
981 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
983 struct xfrm_if_parms {
984 int link; /* ifindex of underlying L2 interface */
985 u32 if_id; /* interface identifyer */
989 struct xfrm_if __rcu *next; /* next interface in list */
990 struct net_device *dev; /* virtual device associated with interface */
991 struct net *net; /* netns for packet i/o */
992 struct xfrm_if_parms p; /* interface parms */
994 struct gro_cells gro_cells;
997 struct xfrm_offload {
998 /* Output sequence number for replay protection on offloading. */
1005 #define SA_DELETE_REQ 1
1006 #define CRYPTO_DONE 2
1007 #define CRYPTO_NEXT_DONE 4
1008 #define CRYPTO_FALLBACK 8
1009 #define XFRM_GSO_SEGMENT 16
1011 #define XFRM_ESP_NO_TRAILER 64
1012 #define XFRM_DEV_RESUME 128
1015 #define CRYPTO_SUCCESS 1
1016 #define CRYPTO_GENERIC_ERROR 2
1017 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1018 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1019 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1020 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1021 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1022 #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 int __xfrm_policy_check2(struct sock *sk, int dir,
1088 struct sk_buff *skb,
1089 unsigned int family, int reverse)
1091 struct net *net = dev_net(skb->dev);
1092 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1094 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1095 return __xfrm_policy_check(sk, ndir, skb, family);
1097 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1098 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1099 __xfrm_policy_check(sk, ndir, skb, family);
1102 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1104 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1107 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1109 return xfrm_policy_check(sk, dir, skb, AF_INET);
1112 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1114 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1117 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1118 struct sk_buff *skb)
1120 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1123 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1124 struct sk_buff *skb)
1126 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1129 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1130 unsigned int family, int reverse);
1132 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1133 unsigned int family)
1135 return __xfrm_decode_session(skb, fl, family, 0);
1138 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1140 unsigned int family)
1142 return __xfrm_decode_session(skb, fl, family, 1);
1145 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1147 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1149 struct net *net = dev_net(skb->dev);
1151 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1152 (skb_dst(skb)->flags & DST_NOXFRM) ||
1153 __xfrm_route_forward(skb, family);
1156 static inline int xfrm4_route_forward(struct sk_buff *skb)
1158 return xfrm_route_forward(skb, AF_INET);
1161 static inline int xfrm6_route_forward(struct sk_buff *skb)
1163 return xfrm_route_forward(skb, AF_INET6);
1166 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1168 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1170 sk->sk_policy[0] = NULL;
1171 sk->sk_policy[1] = NULL;
1172 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1173 return __xfrm_sk_clone_policy(sk, osk);
1177 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1179 static inline void xfrm_sk_free_policy(struct sock *sk)
1181 struct xfrm_policy *pol;
1183 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1184 if (unlikely(pol != NULL)) {
1185 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1186 sk->sk_policy[0] = NULL;
1188 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1189 if (unlikely(pol != NULL)) {
1190 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1191 sk->sk_policy[1] = NULL;
1197 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1198 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1199 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1200 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1201 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1205 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1209 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1213 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1215 unsigned int family)
1219 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1220 struct sk_buff *skb)
1224 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1225 struct sk_buff *skb)
1232 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1236 return (xfrm_address_t *)&fl->u.ip4.daddr;
1238 return (xfrm_address_t *)&fl->u.ip6.daddr;
1244 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1248 return (xfrm_address_t *)&fl->u.ip4.saddr;
1250 return (xfrm_address_t *)&fl->u.ip6.saddr;
1256 void xfrm_flowi_addr_get(const struct flowi *fl,
1257 xfrm_address_t *saddr, xfrm_address_t *daddr,
1258 unsigned short family)
1262 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1263 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1266 saddr->in6 = fl->u.ip6.saddr;
1267 daddr->in6 = fl->u.ip6.daddr;
1272 static __inline__ int
1273 __xfrm4_state_addr_check(const struct xfrm_state *x,
1274 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1276 if (daddr->a4 == x->id.daddr.a4 &&
1277 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1282 static __inline__ int
1283 __xfrm6_state_addr_check(const struct xfrm_state *x,
1284 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1286 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1287 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1288 ipv6_addr_any((struct in6_addr *)saddr) ||
1289 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1294 static __inline__ int
1295 xfrm_state_addr_check(const struct xfrm_state *x,
1296 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1297 unsigned short family)
1301 return __xfrm4_state_addr_check(x, daddr, saddr);
1303 return __xfrm6_state_addr_check(x, daddr, saddr);
1308 static __inline__ int
1309 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1310 unsigned short family)
1314 return __xfrm4_state_addr_check(x,
1315 (const xfrm_address_t *)&fl->u.ip4.daddr,
1316 (const xfrm_address_t *)&fl->u.ip4.saddr);
1318 return __xfrm6_state_addr_check(x,
1319 (const xfrm_address_t *)&fl->u.ip6.daddr,
1320 (const xfrm_address_t *)&fl->u.ip6.saddr);
1325 static inline int xfrm_state_kern(const struct xfrm_state *x)
1327 return atomic_read(&x->tunnel_users);
1330 static inline bool xfrm_id_proto_valid(u8 proto)
1336 #if IS_ENABLED(CONFIG_IPV6)
1337 case IPPROTO_ROUTING:
1338 case IPPROTO_DSTOPTS:
1346 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1347 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1349 return (!userproto || proto == userproto ||
1350 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1351 proto == IPPROTO_ESP ||
1352 proto == IPPROTO_COMP)));
1356 * xfrm algorithm information
1358 struct xfrm_algo_aead_info {
1363 struct xfrm_algo_auth_info {
1368 struct xfrm_algo_encr_info {
1374 struct xfrm_algo_comp_info {
1378 struct xfrm_algo_desc {
1382 u8 pfkey_supported:1;
1384 struct xfrm_algo_aead_info aead;
1385 struct xfrm_algo_auth_info auth;
1386 struct xfrm_algo_encr_info encr;
1387 struct xfrm_algo_comp_info comp;
1389 struct sadb_alg desc;
1392 /* XFRM protocol handlers. */
1393 struct xfrm4_protocol {
1394 int (*handler)(struct sk_buff *skb);
1395 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1397 int (*cb_handler)(struct sk_buff *skb, int err);
1398 int (*err_handler)(struct sk_buff *skb, u32 info);
1400 struct xfrm4_protocol __rcu *next;
1404 struct xfrm6_protocol {
1405 int (*handler)(struct sk_buff *skb);
1406 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1408 int (*cb_handler)(struct sk_buff *skb, int err);
1409 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1410 u8 type, u8 code, int offset, __be32 info);
1412 struct xfrm6_protocol __rcu *next;
1416 /* XFRM tunnel handlers. */
1417 struct xfrm_tunnel {
1418 int (*handler)(struct sk_buff *skb);
1419 int (*cb_handler)(struct sk_buff *skb, int err);
1420 int (*err_handler)(struct sk_buff *skb, u32 info);
1422 struct xfrm_tunnel __rcu *next;
1426 struct xfrm6_tunnel {
1427 int (*handler)(struct sk_buff *skb);
1428 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1429 u8 type, u8 code, int offset, __be32 info);
1430 struct xfrm6_tunnel __rcu *next;
1434 void xfrm_init(void);
1435 void xfrm4_init(void);
1436 int xfrm_state_init(struct net *net);
1437 void xfrm_state_fini(struct net *net);
1438 void xfrm4_state_init(void);
1439 void xfrm4_protocol_init(void);
1441 int xfrm6_init(void);
1442 void xfrm6_fini(void);
1443 int xfrm6_state_init(void);
1444 void xfrm6_state_fini(void);
1445 int xfrm6_protocol_init(void);
1446 void xfrm6_protocol_fini(void);
1448 static inline int xfrm6_init(void)
1452 static inline void xfrm6_fini(void)
1458 #ifdef CONFIG_XFRM_STATISTICS
1459 int xfrm_proc_init(struct net *net);
1460 void xfrm_proc_fini(struct net *net);
1463 int xfrm_sysctl_init(struct net *net);
1464 #ifdef CONFIG_SYSCTL
1465 void xfrm_sysctl_fini(struct net *net);
1467 static inline void xfrm_sysctl_fini(struct net *net)
1472 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1473 struct xfrm_address_filter *filter);
1474 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1475 int (*func)(struct xfrm_state *, int, void*), void *);
1476 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1477 struct xfrm_state *xfrm_state_alloc(struct net *net);
1478 void xfrm_state_free(struct xfrm_state *x);
1479 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1480 const xfrm_address_t *saddr,
1481 const struct flowi *fl,
1482 struct xfrm_tmpl *tmpl,
1483 struct xfrm_policy *pol, int *err,
1484 unsigned short family, u32 if_id);
1485 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1486 xfrm_address_t *daddr,
1487 xfrm_address_t *saddr,
1488 unsigned short family,
1489 u8 mode, u8 proto, u32 reqid);
1490 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1491 unsigned short family);
1492 int xfrm_state_check_expire(struct xfrm_state *x);
1493 void xfrm_state_insert(struct xfrm_state *x);
1494 int xfrm_state_add(struct xfrm_state *x);
1495 int xfrm_state_update(struct xfrm_state *x);
1496 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1497 const xfrm_address_t *daddr, __be32 spi,
1498 u8 proto, unsigned short family);
1499 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1500 const xfrm_address_t *daddr,
1501 const xfrm_address_t *saddr,
1503 unsigned short family);
1504 #ifdef CONFIG_XFRM_SUB_POLICY
1505 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1506 unsigned short family);
1507 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1508 unsigned short family);
1510 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1511 int n, unsigned short family)
1515 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1516 int n, unsigned short family)
1521 struct xfrmk_sadinfo {
1522 u32 sadhcnt; /* current hash bkts */
1523 u32 sadhmcnt; /* max allowed hash bkts */
1524 u32 sadcnt; /* current running count */
1527 struct xfrmk_spdinfo {
1538 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1539 int xfrm_state_delete(struct xfrm_state *x);
1540 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1541 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1542 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1543 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1544 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1545 int xfrm_init_replay(struct xfrm_state *x);
1546 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1547 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1548 int xfrm_init_state(struct xfrm_state *x);
1549 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1550 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1551 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1552 int (*finish)(struct net *, struct sock *,
1554 int xfrm_trans_queue(struct sk_buff *skb,
1555 int (*finish)(struct net *, struct sock *,
1557 int xfrm_output_resume(struct sk_buff *skb, int err);
1558 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1560 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1561 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1564 void xfrm_local_error(struct sk_buff *skb, int mtu);
1565 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1566 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1568 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1569 int xfrm4_rcv(struct sk_buff *skb);
1570 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1572 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1574 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1575 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1576 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1577 return xfrm_input(skb, nexthdr, spi, 0);
1580 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1581 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1582 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1583 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1584 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1585 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1586 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1587 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1588 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1590 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1592 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1593 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1594 int xfrm6_rcv(struct sk_buff *skb);
1595 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1596 xfrm_address_t *saddr, u8 proto);
1597 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1598 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1599 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1600 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1601 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1602 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1603 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1604 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1605 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1606 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1610 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1611 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1612 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1613 int xfrm_user_policy(struct sock *sk, int optname,
1614 u8 __user *optval, int optlen);
1616 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1618 return -ENOPROTOOPT;
1622 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1623 const xfrm_address_t *saddr,
1624 const xfrm_address_t *daddr,
1625 int family, u32 mark);
1627 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1629 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1630 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1631 int (*func)(struct xfrm_policy *, int, int, void*),
1633 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1634 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1635 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1637 struct xfrm_selector *sel,
1638 struct xfrm_sec_ctx *ctx, int delete,
1640 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1641 int dir, u32 id, int delete, int *err);
1642 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1643 void xfrm_policy_hash_rebuild(struct net *net);
1644 u32 xfrm_get_acqseq(void);
1645 int verify_spi_info(u8 proto, u32 min, u32 max);
1646 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1647 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1648 u8 mode, u32 reqid, u32 if_id, u8 proto,
1649 const xfrm_address_t *daddr,
1650 const xfrm_address_t *saddr, int create,
1651 unsigned short family);
1652 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1654 #ifdef CONFIG_XFRM_MIGRATE
1655 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1656 const struct xfrm_migrate *m, int num_bundles,
1657 const struct xfrm_kmaddress *k,
1658 const struct xfrm_encap_tmpl *encap);
1659 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1660 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1661 struct xfrm_migrate *m,
1662 struct xfrm_encap_tmpl *encap);
1663 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1664 struct xfrm_migrate *m, int num_bundles,
1665 struct xfrm_kmaddress *k, struct net *net,
1666 struct xfrm_encap_tmpl *encap);
1669 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1670 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1671 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1672 xfrm_address_t *addr);
1674 void xfrm_input_init(void);
1675 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1677 void xfrm_probe_algs(void);
1678 int xfrm_count_pfkey_auth_supported(void);
1679 int xfrm_count_pfkey_enc_supported(void);
1680 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1681 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1682 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1683 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1684 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1685 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1686 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1687 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1688 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1691 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1692 const xfrm_address_t *b)
1694 return ipv6_addr_equal((const struct in6_addr *)a,
1695 (const struct in6_addr *)b);
1698 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1699 const xfrm_address_t *b,
1705 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1707 return xfrm6_addr_equal(a, b);
1711 static inline int xfrm_policy_id2dir(u32 index)
1717 static inline int xfrm_aevent_is_on(struct net *net)
1723 nlsk = rcu_dereference(net->xfrm.nlsk);
1725 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1730 static inline int xfrm_acquire_is_on(struct net *net)
1736 nlsk = rcu_dereference(net->xfrm.nlsk);
1738 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1745 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1747 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1750 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1752 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1755 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1757 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1760 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1762 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1765 #ifdef CONFIG_XFRM_MIGRATE
1766 static inline int xfrm_replay_clone(struct xfrm_state *x,
1767 struct xfrm_state *orig)
1769 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1774 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1775 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1777 x->preplay_esn = kmemdup(x->replay_esn,
1778 xfrm_replay_state_esn_len(x->replay_esn),
1780 if (!x->preplay_esn) {
1781 kfree(x->replay_esn);
1788 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1790 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1794 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1796 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1799 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1801 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1804 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1807 for (i = 0; i < n; i++)
1808 xfrm_state_put(*(states + i));
1811 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1814 for (i = 0; i < n; i++)
1815 xfrm_state_delete(*(states + i));
1820 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1822 struct sec_path *sp = skb_sec_path(skb);
1824 return sp->xvec[sp->len - 1];
1828 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1831 struct sec_path *sp = skb_sec_path(skb);
1833 if (!sp || !sp->olen || sp->len != sp->olen)
1836 return &sp->ovec[sp->olen - 1];
1842 void __init xfrm_dev_init(void);
1844 #ifdef CONFIG_XFRM_OFFLOAD
1845 void xfrm_dev_resume(struct sk_buff *skb);
1846 void xfrm_dev_backlog(struct softnet_data *sd);
1847 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1848 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1849 struct xfrm_user_offload *xuo);
1850 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1852 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1854 struct xfrm_state_offload *xso = &x->xso;
1856 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1857 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1860 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1862 struct xfrm_state *x = dst->xfrm;
1863 struct xfrm_dst *xdst;
1865 if (!x || !x->type_offload)
1868 xdst = (struct xfrm_dst *) dst;
1869 if (!x->xso.offload_handle && !xdst->child->xfrm)
1871 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1878 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1880 struct xfrm_state_offload *xso = &x->xso;
1883 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1886 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1888 struct xfrm_state_offload *xso = &x->xso;
1889 struct net_device *dev = xso->dev;
1891 if (dev && dev->xfrmdev_ops) {
1892 if (dev->xfrmdev_ops->xdo_dev_state_free)
1893 dev->xfrmdev_ops->xdo_dev_state_free(x);
1899 static inline void xfrm_dev_resume(struct sk_buff *skb)
1903 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1907 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1912 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1917 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1921 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1925 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1930 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1934 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1940 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1942 if (attrs[XFRMA_MARK])
1943 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1950 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1955 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1959 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1961 struct xfrm_mark *m = &x->props.smark;
1963 return (m->v & m->m) | (mark & ~m->m);
1966 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1971 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1975 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1976 unsigned int family)
1978 bool tunnel = false;
1982 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1986 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1990 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1996 #if IS_ENABLED(CONFIG_IPV6)
1997 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2001 if (!sk || sk->sk_family != AF_INET6)
2004 proto = sk->sk_protocol;
2005 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2006 return inet6_sk(sk)->dontfrag;
2011 #endif /* _NET_XFRM_H */