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;
197 /* Data for care-of address */
198 xfrm_address_t *coaddr;
200 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
201 struct xfrm_state *tunnel;
203 /* If a tunnel, number of users + 1 */
204 atomic_t tunnel_users;
206 /* State for replay detection */
207 struct xfrm_replay_state replay;
208 struct xfrm_replay_state_esn *replay_esn;
210 /* Replay detection state at the time we sent the last notification */
211 struct xfrm_replay_state preplay;
212 struct xfrm_replay_state_esn *preplay_esn;
214 /* The functions for replay detection. */
215 const struct xfrm_replay *repl;
217 /* internal flag that only holds state for delayed aevent at the
222 /* Replay detection notification settings */
226 /* Replay detection notification timer */
227 struct timer_list rtimer;
230 struct xfrm_stats stats;
232 struct xfrm_lifetime_cur curlft;
233 struct hrtimer mtimer;
235 struct xfrm_state_offload xso;
237 /* used to fix curlft->add_time when changing date */
243 struct page_frag xfrag;
245 /* Reference to data common to all the instances of this
247 const struct xfrm_type *type;
248 struct xfrm_mode inner_mode;
249 struct xfrm_mode inner_mode_iaf;
250 struct xfrm_mode outer_mode;
252 const struct xfrm_type_offload *type_offload;
254 /* Security context */
255 struct xfrm_sec_ctx *security;
257 /* Private data of this transformer, format is opaque,
258 * interpreted by xfrm_type methods. */
262 static inline struct net *xs_net(struct xfrm_state *x)
264 return read_pnet(&x->xs_net);
267 /* xflags - make enum if more show up */
268 #define XFRM_TIME_DEFER 1
269 #define XFRM_SOFT_EXPIRE 2
280 /* callback structure passed from either netlink or pfkey */
297 void (*advance)(struct xfrm_state *x, __be32 net_seq);
298 int (*check)(struct xfrm_state *x,
301 int (*recheck)(struct xfrm_state *x,
304 void (*notify)(struct xfrm_state *x, int event);
305 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
309 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
310 unsigned short family);
313 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
314 void xfrm_if_unregister_cb(void);
319 struct xfrm_policy_afinfo {
320 struct dst_ops *dst_ops;
321 struct dst_entry *(*dst_lookup)(struct net *net,
323 const xfrm_address_t *saddr,
324 const xfrm_address_t *daddr,
326 int (*get_saddr)(struct net *net, int oif,
327 xfrm_address_t *saddr,
328 xfrm_address_t *daddr,
330 int (*fill_dst)(struct xfrm_dst *xdst,
331 struct net_device *dev,
332 const struct flowi *fl);
333 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
336 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
337 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
338 void km_policy_notify(struct xfrm_policy *xp, int dir,
339 const struct km_event *c);
340 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
343 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
344 struct xfrm_policy *pol);
345 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
346 int __xfrm_state_delete(struct xfrm_state *x);
348 struct xfrm_state_afinfo {
352 const struct xfrm_type_offload *type_offload_esp;
354 const struct xfrm_type *type_esp;
355 const struct xfrm_type *type_ipip;
356 const struct xfrm_type *type_ipip6;
357 const struct xfrm_type *type_comp;
358 const struct xfrm_type *type_ah;
359 const struct xfrm_type *type_routing;
360 const struct xfrm_type *type_dstopts;
362 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
363 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
364 int (*extract_input)(struct xfrm_state *x,
365 struct sk_buff *skb);
366 int (*extract_output)(struct xfrm_state *x,
367 struct sk_buff *skb);
368 int (*transport_finish)(struct sk_buff *skb,
370 void (*local_error)(struct sk_buff *skb, u32 mtu);
373 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
374 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
375 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
376 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
378 struct xfrm_input_afinfo {
380 int (*callback)(struct sk_buff *skb, u8 protocol,
384 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
385 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
387 void xfrm_flush_gc(void);
388 void xfrm_state_delete_tunnel(struct xfrm_state *x);
392 struct module *owner;
395 #define XFRM_TYPE_NON_FRAGMENT 1
396 #define XFRM_TYPE_REPLAY_PROT 2
397 #define XFRM_TYPE_LOCAL_COADDR 4
398 #define XFRM_TYPE_REMOTE_COADDR 8
400 int (*init_state)(struct xfrm_state *x);
401 void (*destructor)(struct xfrm_state *);
402 int (*input)(struct xfrm_state *, struct sk_buff *skb);
403 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
404 int (*reject)(struct xfrm_state *, struct sk_buff *,
405 const struct flowi *);
406 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
409 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
410 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
412 struct xfrm_type_offload {
414 struct module *owner;
416 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
417 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
418 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
421 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
422 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
424 static inline int xfrm_af2proto(unsigned int family)
436 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
438 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
439 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
440 return &x->inner_mode;
442 return &x->inner_mode_iaf;
446 /* id in template is interpreted as:
447 * daddr - destination of tunnel, may be zero for transport mode.
448 * spi - zero to acquire spi. Not zero if spi is static, then
449 * daddr must be fixed too.
450 * proto - AH/ESP/IPCOMP
454 /* Source address of tunnel. Ignored, if it is not a tunnel. */
455 xfrm_address_t saddr;
457 unsigned short encap_family;
461 /* Mode: transport, tunnel etc. */
464 /* Sharing mode: unique, this session only, this user only etc. */
467 /* May skip this transfomration if no SA is found */
470 /* Skip aalgos/ealgos/calgos checks. */
473 /* Bit mask of algos allowed for acquisition */
479 #define XFRM_MAX_DEPTH 6
480 #define XFRM_MAX_OFFLOAD_DEPTH 1
482 struct xfrm_policy_walk_entry {
483 struct list_head all;
487 struct xfrm_policy_walk {
488 struct xfrm_policy_walk_entry walk;
493 struct xfrm_policy_queue {
494 struct sk_buff_head hold_queue;
495 struct timer_list hold_timer;
496 unsigned long timeout;
500 possible_net_t xp_net;
501 struct hlist_node bydst;
502 struct hlist_node byidx;
504 /* This lock only affects elements except for entry. */
508 struct timer_list timer;
514 struct xfrm_mark mark;
515 struct xfrm_selector selector;
516 struct xfrm_lifetime_cfg lft;
517 struct xfrm_lifetime_cur curlft;
518 struct xfrm_policy_walk_entry walk;
519 struct xfrm_policy_queue polq;
526 struct xfrm_sec_ctx *security;
527 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
528 struct hlist_node bydst_inexact_list;
532 static inline struct net *xp_net(const struct xfrm_policy *xp)
534 return read_pnet(&xp->xp_net);
537 struct xfrm_kmaddress {
538 xfrm_address_t local;
539 xfrm_address_t remote;
544 struct xfrm_migrate {
545 xfrm_address_t old_daddr;
546 xfrm_address_t old_saddr;
547 xfrm_address_t new_daddr;
548 xfrm_address_t new_saddr;
557 #define XFRM_KM_TIMEOUT 30
559 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
560 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
562 /* default aevent timeout in units of 100ms */
563 #define XFRM_AE_ETIME 10
564 /* Async Event timer multiplier */
565 #define XFRM_AE_ETH_M 10
566 /* default seq threshold size */
567 #define XFRM_AE_SEQT_SIZE 2
570 struct list_head list;
571 int (*notify)(struct xfrm_state *x, const struct km_event *c);
572 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
573 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
574 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
575 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
576 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
577 int (*migrate)(const struct xfrm_selector *sel,
579 const struct xfrm_migrate *m,
581 const struct xfrm_kmaddress *k,
582 const struct xfrm_encap_tmpl *encap);
583 bool (*is_alive)(const struct km_event *c);
586 int xfrm_register_km(struct xfrm_mgr *km);
587 int xfrm_unregister_km(struct xfrm_mgr *km);
589 struct xfrm_tunnel_skb_cb {
591 struct inet_skb_parm h4;
592 struct inet6_skb_parm h6;
596 struct ip_tunnel *ip4;
601 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
604 * This structure is used for the duration where packets are being
605 * transformed by IPsec. As soon as the packet leaves IPsec the
606 * area beyond the generic IP part may be overwritten.
609 struct xfrm_tunnel_skb_cb header;
611 /* Sequence number for replay protection. */
624 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
627 * This structure is used by the afinfo prepare_input/prepare_output functions
628 * to transmit header information to the mode input/output functions.
630 struct xfrm_mode_skb_cb {
631 struct xfrm_tunnel_skb_cb header;
633 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
637 /* IP header length (excluding options or extension headers). */
640 /* TOS for IPv4, class for IPv6. */
643 /* TTL for IPv4, hop limitfor IPv6. */
646 /* Protocol for IPv4, NH for IPv6. */
649 /* Option length for IPv4, zero for IPv6. */
652 /* Used by IPv6 only, zero for IPv4. */
656 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
659 * This structure is used by the input processing to locate the SPI and
660 * related information.
662 struct xfrm_spi_skb_cb {
663 struct xfrm_tunnel_skb_cb header;
665 unsigned int daddroff;
670 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
672 #ifdef CONFIG_AUDITSYSCALL
673 static inline struct audit_buffer *xfrm_audit_start(const char *op)
675 struct audit_buffer *audit_buf = NULL;
677 if (audit_enabled == AUDIT_OFF)
679 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
680 AUDIT_MAC_IPSEC_EVENT);
681 if (audit_buf == NULL)
683 audit_log_format(audit_buf, "op=%s", op);
687 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
688 struct audit_buffer *audit_buf)
690 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
691 audit_get_loginuid(current) :
693 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
696 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
697 audit_log_task_context(audit_buf);
700 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
701 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
703 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
704 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
705 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
706 struct sk_buff *skb);
707 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
709 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
710 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
712 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
716 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
721 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
726 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
731 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
736 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
741 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
742 struct sk_buff *skb, __be32 net_seq)
746 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
751 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
752 __be32 net_spi, __be32 net_seq)
756 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
757 struct sk_buff *skb, u8 proto)
760 #endif /* CONFIG_AUDITSYSCALL */
762 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
764 if (likely(policy != NULL))
765 refcount_inc(&policy->refcnt);
768 void xfrm_policy_destroy(struct xfrm_policy *policy);
770 static inline void xfrm_pol_put(struct xfrm_policy *policy)
772 if (refcount_dec_and_test(&policy->refcnt))
773 xfrm_policy_destroy(policy);
776 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
779 for (i = npols - 1; i >= 0; --i)
780 xfrm_pol_put(pols[i]);
783 void __xfrm_state_destroy(struct xfrm_state *, bool);
785 static inline void __xfrm_state_put(struct xfrm_state *x)
787 refcount_dec(&x->refcnt);
790 static inline void xfrm_state_put(struct xfrm_state *x)
792 if (refcount_dec_and_test(&x->refcnt))
793 __xfrm_state_destroy(x, false);
796 static inline void xfrm_state_put_sync(struct xfrm_state *x)
798 if (refcount_dec_and_test(&x->refcnt))
799 __xfrm_state_destroy(x, true);
802 static inline void xfrm_state_hold(struct xfrm_state *x)
804 refcount_inc(&x->refcnt);
807 static inline bool addr_match(const void *token1, const void *token2,
808 unsigned int prefixlen)
810 const __be32 *a1 = token1;
811 const __be32 *a2 = token2;
815 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
816 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
819 if (memcmp(a1, a2, pdw << 2))
825 mask = htonl((0xffffffff) << (32 - pbi));
827 if ((a1[pdw] ^ a2[pdw]) & mask)
834 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
836 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
837 if (sizeof(long) == 4 && prefixlen == 0)
839 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
843 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
846 switch(fl->flowi_proto) {
849 case IPPROTO_UDPLITE:
851 port = uli->ports.sport;
855 port = htons(uli->icmpt.type);
858 port = htons(uli->mht.type);
861 port = htons(ntohl(uli->gre_key) >> 16);
870 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
873 switch(fl->flowi_proto) {
876 case IPPROTO_UDPLITE:
878 port = uli->ports.dport;
882 port = htons(uli->icmpt.code);
885 port = htons(ntohl(uli->gre_key) & 0xffff);
893 bool xfrm_selector_match(const struct xfrm_selector *sel,
894 const struct flowi *fl, unsigned short family);
896 #ifdef CONFIG_SECURITY_NETWORK_XFRM
897 /* If neither has a context --> match
898 * Otherwise, both must have a context and the sids, doi, alg must match
900 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
902 return ((!s1 && !s2) ||
904 (s1->ctx_sid == s2->ctx_sid) &&
905 (s1->ctx_doi == s2->ctx_doi) &&
906 (s1->ctx_alg == s2->ctx_alg)));
909 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
915 /* A struct encoding bundle of transformations to apply to some set of flow.
917 * xdst->child points to the next element of bundle.
918 * dst->xfrm points to an instanse of transformer.
920 * Due to unfortunate limitations of current routing cache, which we
921 * have no time to fix, it mirrors struct rtable and bound to the same
922 * routing key, including saddr,daddr. However, we can have many of
923 * bundles differing by session id. All the bundles grow from a parent
928 struct dst_entry dst;
932 struct dst_entry *route;
933 struct dst_entry *child;
934 struct dst_entry *path;
935 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
936 int num_pols, num_xfrms;
939 u32 route_mtu_cached;
940 u32 child_mtu_cached;
945 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
949 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
954 return (struct dst_entry *) dst;
957 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
961 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
969 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
974 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
976 xfrm_pols_put(xdst->pols, xdst->num_pols);
977 dst_release(xdst->route);
978 if (likely(xdst->u.dst.xfrm))
979 xfrm_state_put(xdst->u.dst.xfrm);
983 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
985 struct xfrm_if_parms {
986 int link; /* ifindex of underlying L2 interface */
987 u32 if_id; /* interface identifyer */
991 struct xfrm_if __rcu *next; /* next interface in list */
992 struct net_device *dev; /* virtual device associated with interface */
993 struct net *net; /* netns for packet i/o */
994 struct xfrm_if_parms p; /* interface parms */
996 struct gro_cells gro_cells;
999 struct xfrm_offload {
1000 /* Output sequence number for replay protection on offloading. */
1007 #define SA_DELETE_REQ 1
1008 #define CRYPTO_DONE 2
1009 #define CRYPTO_NEXT_DONE 4
1010 #define CRYPTO_FALLBACK 8
1011 #define XFRM_GSO_SEGMENT 16
1013 #define XFRM_ESP_NO_TRAILER 64
1014 #define XFRM_DEV_RESUME 128
1017 #define CRYPTO_SUCCESS 1
1018 #define CRYPTO_GENERIC_ERROR 2
1019 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1020 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1021 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1022 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1023 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1024 #define CRYPTO_INVALID_PROTOCOL 128
1033 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1034 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1037 struct sec_path *secpath_set(struct sk_buff *skb);
1040 secpath_reset(struct sk_buff *skb)
1043 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1048 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1052 return addr->a4 == 0;
1054 return ipv6_addr_any(&addr->in6);
1060 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1062 return (tmpl->saddr.a4 &&
1063 tmpl->saddr.a4 != x->props.saddr.a4);
1067 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1069 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1070 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1074 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1078 return __xfrm4_state_addr_cmp(tmpl, x);
1080 return __xfrm6_state_addr_cmp(tmpl, x);
1086 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1087 unsigned short family);
1089 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1090 struct sk_buff *skb,
1091 unsigned int family, int reverse)
1093 struct net *net = dev_net(skb->dev);
1094 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1096 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1097 return __xfrm_policy_check(sk, ndir, skb, family);
1099 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1100 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1101 __xfrm_policy_check(sk, ndir, skb, family);
1104 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1106 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1109 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1111 return xfrm_policy_check(sk, dir, skb, AF_INET);
1114 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1116 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1119 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1120 struct sk_buff *skb)
1122 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1125 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1126 struct sk_buff *skb)
1128 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1131 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1132 unsigned int family, int reverse);
1134 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1135 unsigned int family)
1137 return __xfrm_decode_session(skb, fl, family, 0);
1140 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1142 unsigned int family)
1144 return __xfrm_decode_session(skb, fl, family, 1);
1147 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1149 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1151 struct net *net = dev_net(skb->dev);
1153 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1154 (skb_dst(skb)->flags & DST_NOXFRM) ||
1155 __xfrm_route_forward(skb, family);
1158 static inline int xfrm4_route_forward(struct sk_buff *skb)
1160 return xfrm_route_forward(skb, AF_INET);
1163 static inline int xfrm6_route_forward(struct sk_buff *skb)
1165 return xfrm_route_forward(skb, AF_INET6);
1168 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1170 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1172 sk->sk_policy[0] = NULL;
1173 sk->sk_policy[1] = NULL;
1174 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1175 return __xfrm_sk_clone_policy(sk, osk);
1179 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1181 static inline void xfrm_sk_free_policy(struct sock *sk)
1183 struct xfrm_policy *pol;
1185 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1186 if (unlikely(pol != NULL)) {
1187 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1188 sk->sk_policy[0] = NULL;
1190 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1191 if (unlikely(pol != NULL)) {
1192 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1193 sk->sk_policy[1] = NULL;
1199 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1200 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1201 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1202 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1203 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1207 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1211 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1215 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1217 unsigned int family)
1221 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1222 struct sk_buff *skb)
1226 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1227 struct sk_buff *skb)
1234 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1238 return (xfrm_address_t *)&fl->u.ip4.daddr;
1240 return (xfrm_address_t *)&fl->u.ip6.daddr;
1246 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1250 return (xfrm_address_t *)&fl->u.ip4.saddr;
1252 return (xfrm_address_t *)&fl->u.ip6.saddr;
1258 void xfrm_flowi_addr_get(const struct flowi *fl,
1259 xfrm_address_t *saddr, xfrm_address_t *daddr,
1260 unsigned short family)
1264 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1265 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1268 saddr->in6 = fl->u.ip6.saddr;
1269 daddr->in6 = fl->u.ip6.daddr;
1274 static __inline__ int
1275 __xfrm4_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1278 if (daddr->a4 == x->id.daddr.a4 &&
1279 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1284 static __inline__ int
1285 __xfrm6_state_addr_check(const struct xfrm_state *x,
1286 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1288 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1289 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1290 ipv6_addr_any((struct in6_addr *)saddr) ||
1291 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1296 static __inline__ int
1297 xfrm_state_addr_check(const struct xfrm_state *x,
1298 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1299 unsigned short family)
1303 return __xfrm4_state_addr_check(x, daddr, saddr);
1305 return __xfrm6_state_addr_check(x, daddr, saddr);
1310 static __inline__ int
1311 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1312 unsigned short family)
1316 return __xfrm4_state_addr_check(x,
1317 (const xfrm_address_t *)&fl->u.ip4.daddr,
1318 (const xfrm_address_t *)&fl->u.ip4.saddr);
1320 return __xfrm6_state_addr_check(x,
1321 (const xfrm_address_t *)&fl->u.ip6.daddr,
1322 (const xfrm_address_t *)&fl->u.ip6.saddr);
1327 static inline int xfrm_state_kern(const struct xfrm_state *x)
1329 return atomic_read(&x->tunnel_users);
1332 static inline bool xfrm_id_proto_valid(u8 proto)
1338 #if IS_ENABLED(CONFIG_IPV6)
1339 case IPPROTO_ROUTING:
1340 case IPPROTO_DSTOPTS:
1348 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1349 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1351 return (!userproto || proto == userproto ||
1352 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1353 proto == IPPROTO_ESP ||
1354 proto == IPPROTO_COMP)));
1358 * xfrm algorithm information
1360 struct xfrm_algo_aead_info {
1365 struct xfrm_algo_auth_info {
1370 struct xfrm_algo_encr_info {
1376 struct xfrm_algo_comp_info {
1380 struct xfrm_algo_desc {
1384 u8 pfkey_supported:1;
1386 struct xfrm_algo_aead_info aead;
1387 struct xfrm_algo_auth_info auth;
1388 struct xfrm_algo_encr_info encr;
1389 struct xfrm_algo_comp_info comp;
1391 struct sadb_alg desc;
1394 /* XFRM protocol handlers. */
1395 struct xfrm4_protocol {
1396 int (*handler)(struct sk_buff *skb);
1397 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1399 int (*cb_handler)(struct sk_buff *skb, int err);
1400 int (*err_handler)(struct sk_buff *skb, u32 info);
1402 struct xfrm4_protocol __rcu *next;
1406 struct xfrm6_protocol {
1407 int (*handler)(struct sk_buff *skb);
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 (*err_handler)(struct sk_buff *skb, u32 info);
1421 struct xfrm_tunnel __rcu *next;
1425 struct xfrm6_tunnel {
1426 int (*handler)(struct sk_buff *skb);
1427 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1428 u8 type, u8 code, int offset, __be32 info);
1429 struct xfrm6_tunnel __rcu *next;
1433 void xfrm_init(void);
1434 void xfrm4_init(void);
1435 int xfrm_state_init(struct net *net);
1436 void xfrm_state_fini(struct net *net);
1437 void xfrm4_state_init(void);
1438 void xfrm4_protocol_init(void);
1440 int xfrm6_init(void);
1441 void xfrm6_fini(void);
1442 int xfrm6_state_init(void);
1443 void xfrm6_state_fini(void);
1444 int xfrm6_protocol_init(void);
1445 void xfrm6_protocol_fini(void);
1447 static inline int xfrm6_init(void)
1451 static inline void xfrm6_fini(void)
1457 #ifdef CONFIG_XFRM_STATISTICS
1458 int xfrm_proc_init(struct net *net);
1459 void xfrm_proc_fini(struct net *net);
1462 int xfrm_sysctl_init(struct net *net);
1463 #ifdef CONFIG_SYSCTL
1464 void xfrm_sysctl_fini(struct net *net);
1466 static inline void xfrm_sysctl_fini(struct net *net)
1471 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1472 struct xfrm_address_filter *filter);
1473 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1474 int (*func)(struct xfrm_state *, int, void*), void *);
1475 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1476 struct xfrm_state *xfrm_state_alloc(struct net *net);
1477 void xfrm_state_free(struct xfrm_state *x);
1478 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1479 const xfrm_address_t *saddr,
1480 const struct flowi *fl,
1481 struct xfrm_tmpl *tmpl,
1482 struct xfrm_policy *pol, int *err,
1483 unsigned short family, u32 if_id);
1484 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1485 xfrm_address_t *daddr,
1486 xfrm_address_t *saddr,
1487 unsigned short family,
1488 u8 mode, u8 proto, u32 reqid);
1489 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1490 unsigned short family);
1491 int xfrm_state_check_expire(struct xfrm_state *x);
1492 void xfrm_state_insert(struct xfrm_state *x);
1493 int xfrm_state_add(struct xfrm_state *x);
1494 int xfrm_state_update(struct xfrm_state *x);
1495 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1496 const xfrm_address_t *daddr, __be32 spi,
1497 u8 proto, unsigned short family);
1498 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1499 const xfrm_address_t *daddr,
1500 const xfrm_address_t *saddr,
1502 unsigned short family);
1503 #ifdef CONFIG_XFRM_SUB_POLICY
1504 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1505 unsigned short family);
1506 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1507 unsigned short family);
1509 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1510 int n, unsigned short family)
1514 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1515 int n, unsigned short family)
1520 struct xfrmk_sadinfo {
1521 u32 sadhcnt; /* current hash bkts */
1522 u32 sadhmcnt; /* max allowed hash bkts */
1523 u32 sadcnt; /* current running count */
1526 struct xfrmk_spdinfo {
1537 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1538 int xfrm_state_delete(struct xfrm_state *x);
1539 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1540 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1541 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1542 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1543 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1544 int xfrm_init_replay(struct xfrm_state *x);
1545 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1546 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1547 int xfrm_init_state(struct xfrm_state *x);
1548 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1549 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1550 int xfrm_trans_queue(struct sk_buff *skb,
1551 int (*finish)(struct net *, struct sock *,
1553 int xfrm_output_resume(struct sk_buff *skb, int err);
1554 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1556 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1557 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1560 void xfrm_local_error(struct sk_buff *skb, int mtu);
1561 int xfrm4_extract_header(struct sk_buff *skb);
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_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1578 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1579 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1580 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1581 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1582 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1583 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1584 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1585 int xfrm6_extract_header(struct sk_buff *skb);
1586 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1587 int xfrm6_rcv_spi(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_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1602 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1603 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1604 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1608 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1609 int xfrm_user_policy(struct sock *sk, int optname,
1610 u8 __user *optval, int optlen);
1612 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1614 return -ENOPROTOOPT;
1618 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1619 const xfrm_address_t *saddr,
1620 const xfrm_address_t *daddr,
1621 int family, u32 mark);
1623 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1625 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1626 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1627 int (*func)(struct xfrm_policy *, int, int, void*),
1629 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1630 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1631 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1633 struct xfrm_selector *sel,
1634 struct xfrm_sec_ctx *ctx, int delete,
1636 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1637 int dir, u32 id, int delete, int *err);
1638 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1639 void xfrm_policy_hash_rebuild(struct net *net);
1640 u32 xfrm_get_acqseq(void);
1641 int verify_spi_info(u8 proto, u32 min, u32 max);
1642 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1643 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1644 u8 mode, u32 reqid, u32 if_id, u8 proto,
1645 const xfrm_address_t *daddr,
1646 const xfrm_address_t *saddr, int create,
1647 unsigned short family);
1648 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1650 #ifdef CONFIG_XFRM_MIGRATE
1651 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1652 const struct xfrm_migrate *m, int num_bundles,
1653 const struct xfrm_kmaddress *k,
1654 const struct xfrm_encap_tmpl *encap);
1655 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1656 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1657 struct xfrm_migrate *m,
1658 struct xfrm_encap_tmpl *encap);
1659 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1660 struct xfrm_migrate *m, int num_bundles,
1661 struct xfrm_kmaddress *k, struct net *net,
1662 struct xfrm_encap_tmpl *encap);
1665 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1666 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1667 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1668 xfrm_address_t *addr);
1670 void xfrm_input_init(void);
1671 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1673 void xfrm_probe_algs(void);
1674 int xfrm_count_pfkey_auth_supported(void);
1675 int xfrm_count_pfkey_enc_supported(void);
1676 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1677 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1678 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1679 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1680 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1681 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1682 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1683 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1684 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1687 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1688 const xfrm_address_t *b)
1690 return ipv6_addr_equal((const struct in6_addr *)a,
1691 (const struct in6_addr *)b);
1694 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1695 const xfrm_address_t *b,
1701 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1703 return xfrm6_addr_equal(a, b);
1707 static inline int xfrm_policy_id2dir(u32 index)
1713 static inline int xfrm_aevent_is_on(struct net *net)
1719 nlsk = rcu_dereference(net->xfrm.nlsk);
1721 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1726 static inline int xfrm_acquire_is_on(struct net *net)
1732 nlsk = rcu_dereference(net->xfrm.nlsk);
1734 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1741 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1743 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1746 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1748 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1751 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1753 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1756 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1758 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1761 #ifdef CONFIG_XFRM_MIGRATE
1762 static inline int xfrm_replay_clone(struct xfrm_state *x,
1763 struct xfrm_state *orig)
1765 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1770 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1771 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1773 x->preplay_esn = kmemdup(x->replay_esn,
1774 xfrm_replay_state_esn_len(x->replay_esn),
1776 if (!x->preplay_esn) {
1777 kfree(x->replay_esn);
1784 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1786 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1790 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1792 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1795 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1797 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1800 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1803 for (i = 0; i < n; i++)
1804 xfrm_state_put(*(states + i));
1807 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1810 for (i = 0; i < n; i++)
1811 xfrm_state_delete(*(states + i));
1816 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1818 struct sec_path *sp = skb_sec_path(skb);
1820 return sp->xvec[sp->len - 1];
1824 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1827 struct sec_path *sp = skb_sec_path(skb);
1829 if (!sp || !sp->olen || sp->len != sp->olen)
1832 return &sp->ovec[sp->olen - 1];
1838 void __init xfrm_dev_init(void);
1840 #ifdef CONFIG_XFRM_OFFLOAD
1841 void xfrm_dev_resume(struct sk_buff *skb);
1842 void xfrm_dev_backlog(struct softnet_data *sd);
1843 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1844 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1845 struct xfrm_user_offload *xuo);
1846 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1848 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1850 struct xfrm_state_offload *xso = &x->xso;
1852 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1853 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1856 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1858 struct xfrm_state *x = dst->xfrm;
1859 struct xfrm_dst *xdst;
1861 if (!x || !x->type_offload)
1864 xdst = (struct xfrm_dst *) dst;
1865 if (!x->xso.offload_handle && !xdst->child->xfrm)
1867 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1874 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1876 struct xfrm_state_offload *xso = &x->xso;
1879 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1882 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1884 struct xfrm_state_offload *xso = &x->xso;
1885 struct net_device *dev = xso->dev;
1887 if (dev && dev->xfrmdev_ops) {
1888 if (dev->xfrmdev_ops->xdo_dev_state_free)
1889 dev->xfrmdev_ops->xdo_dev_state_free(x);
1895 static inline void xfrm_dev_resume(struct sk_buff *skb)
1899 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1903 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1908 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1913 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1917 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1921 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1926 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1930 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1936 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1938 if (attrs[XFRMA_MARK])
1939 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1946 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1951 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1955 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1957 struct xfrm_mark *m = &x->props.smark;
1959 return (m->v & m->m) | (mark & ~m->m);
1962 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1967 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1971 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1972 unsigned int family)
1974 bool tunnel = false;
1978 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1982 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1986 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1991 #endif /* _NET_XFRM_H */