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 char name[IFNAMSIZ]; /* name of XFRM device */
987 int link; /* ifindex of underlying L2 interface */
988 u32 if_id; /* interface identifyer */
992 struct xfrm_if __rcu *next; /* next interface in list */
993 struct net_device *dev; /* virtual device associated with interface */
994 struct net_device *phydev; /* physical device */
995 struct net *net; /* netns for packet i/o */
996 struct xfrm_if_parms p; /* interface parms */
998 struct gro_cells gro_cells;
1001 struct xfrm_offload {
1002 /* Output sequence number for replay protection on offloading. */
1009 #define SA_DELETE_REQ 1
1010 #define CRYPTO_DONE 2
1011 #define CRYPTO_NEXT_DONE 4
1012 #define CRYPTO_FALLBACK 8
1013 #define XFRM_GSO_SEGMENT 16
1015 #define XFRM_ESP_NO_TRAILER 64
1016 #define XFRM_DEV_RESUME 128
1019 #define CRYPTO_SUCCESS 1
1020 #define CRYPTO_GENERIC_ERROR 2
1021 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1022 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1023 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1024 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1025 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1026 #define CRYPTO_INVALID_PROTOCOL 128
1035 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1036 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1039 struct sec_path *secpath_set(struct sk_buff *skb);
1042 secpath_reset(struct sk_buff *skb)
1045 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1050 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1054 return addr->a4 == 0;
1056 return ipv6_addr_any(&addr->in6);
1062 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1064 return (tmpl->saddr.a4 &&
1065 tmpl->saddr.a4 != x->props.saddr.a4);
1069 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1071 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1072 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1076 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1080 return __xfrm4_state_addr_cmp(tmpl, x);
1082 return __xfrm6_state_addr_cmp(tmpl, x);
1088 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1089 unsigned short family);
1091 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1092 struct sk_buff *skb,
1093 unsigned int family, int reverse)
1095 struct net *net = dev_net(skb->dev);
1096 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1098 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1099 return __xfrm_policy_check(sk, ndir, skb, family);
1101 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1102 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1103 __xfrm_policy_check(sk, ndir, skb, family);
1106 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1108 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1111 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1113 return xfrm_policy_check(sk, dir, skb, AF_INET);
1116 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1118 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1121 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1122 struct sk_buff *skb)
1124 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1127 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1128 struct sk_buff *skb)
1130 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1133 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1134 unsigned int family, int reverse);
1136 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1137 unsigned int family)
1139 return __xfrm_decode_session(skb, fl, family, 0);
1142 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1144 unsigned int family)
1146 return __xfrm_decode_session(skb, fl, family, 1);
1149 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1151 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1153 struct net *net = dev_net(skb->dev);
1155 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1156 (skb_dst(skb)->flags & DST_NOXFRM) ||
1157 __xfrm_route_forward(skb, family);
1160 static inline int xfrm4_route_forward(struct sk_buff *skb)
1162 return xfrm_route_forward(skb, AF_INET);
1165 static inline int xfrm6_route_forward(struct sk_buff *skb)
1167 return xfrm_route_forward(skb, AF_INET6);
1170 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1172 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1174 sk->sk_policy[0] = NULL;
1175 sk->sk_policy[1] = NULL;
1176 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1177 return __xfrm_sk_clone_policy(sk, osk);
1181 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1183 static inline void xfrm_sk_free_policy(struct sock *sk)
1185 struct xfrm_policy *pol;
1187 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1188 if (unlikely(pol != NULL)) {
1189 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1190 sk->sk_policy[0] = NULL;
1192 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1193 if (unlikely(pol != NULL)) {
1194 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1195 sk->sk_policy[1] = NULL;
1201 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1202 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1203 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1204 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1205 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1209 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1213 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1217 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1219 unsigned int family)
1223 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1224 struct sk_buff *skb)
1228 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1229 struct sk_buff *skb)
1236 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1240 return (xfrm_address_t *)&fl->u.ip4.daddr;
1242 return (xfrm_address_t *)&fl->u.ip6.daddr;
1248 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1252 return (xfrm_address_t *)&fl->u.ip4.saddr;
1254 return (xfrm_address_t *)&fl->u.ip6.saddr;
1260 void xfrm_flowi_addr_get(const struct flowi *fl,
1261 xfrm_address_t *saddr, xfrm_address_t *daddr,
1262 unsigned short family)
1266 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1267 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1270 saddr->in6 = fl->u.ip6.saddr;
1271 daddr->in6 = fl->u.ip6.daddr;
1276 static __inline__ int
1277 __xfrm4_state_addr_check(const struct xfrm_state *x,
1278 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1280 if (daddr->a4 == x->id.daddr.a4 &&
1281 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1286 static __inline__ int
1287 __xfrm6_state_addr_check(const struct xfrm_state *x,
1288 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1290 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1291 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1292 ipv6_addr_any((struct in6_addr *)saddr) ||
1293 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1298 static __inline__ int
1299 xfrm_state_addr_check(const struct xfrm_state *x,
1300 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1301 unsigned short family)
1305 return __xfrm4_state_addr_check(x, daddr, saddr);
1307 return __xfrm6_state_addr_check(x, daddr, saddr);
1312 static __inline__ int
1313 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1314 unsigned short family)
1318 return __xfrm4_state_addr_check(x,
1319 (const xfrm_address_t *)&fl->u.ip4.daddr,
1320 (const xfrm_address_t *)&fl->u.ip4.saddr);
1322 return __xfrm6_state_addr_check(x,
1323 (const xfrm_address_t *)&fl->u.ip6.daddr,
1324 (const xfrm_address_t *)&fl->u.ip6.saddr);
1329 static inline int xfrm_state_kern(const struct xfrm_state *x)
1331 return atomic_read(&x->tunnel_users);
1334 static inline bool xfrm_id_proto_valid(u8 proto)
1340 #if IS_ENABLED(CONFIG_IPV6)
1341 case IPPROTO_ROUTING:
1342 case IPPROTO_DSTOPTS:
1350 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1351 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1353 return (!userproto || proto == userproto ||
1354 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1355 proto == IPPROTO_ESP ||
1356 proto == IPPROTO_COMP)));
1360 * xfrm algorithm information
1362 struct xfrm_algo_aead_info {
1367 struct xfrm_algo_auth_info {
1372 struct xfrm_algo_encr_info {
1378 struct xfrm_algo_comp_info {
1382 struct xfrm_algo_desc {
1386 u8 pfkey_supported:1;
1388 struct xfrm_algo_aead_info aead;
1389 struct xfrm_algo_auth_info auth;
1390 struct xfrm_algo_encr_info encr;
1391 struct xfrm_algo_comp_info comp;
1393 struct sadb_alg desc;
1396 /* XFRM protocol handlers. */
1397 struct xfrm4_protocol {
1398 int (*handler)(struct sk_buff *skb);
1399 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1401 int (*cb_handler)(struct sk_buff *skb, int err);
1402 int (*err_handler)(struct sk_buff *skb, u32 info);
1404 struct xfrm4_protocol __rcu *next;
1408 struct xfrm6_protocol {
1409 int (*handler)(struct sk_buff *skb);
1410 int (*cb_handler)(struct sk_buff *skb, int err);
1411 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1412 u8 type, u8 code, int offset, __be32 info);
1414 struct xfrm6_protocol __rcu *next;
1418 /* XFRM tunnel handlers. */
1419 struct xfrm_tunnel {
1420 int (*handler)(struct sk_buff *skb);
1421 int (*err_handler)(struct sk_buff *skb, u32 info);
1423 struct xfrm_tunnel __rcu *next;
1427 struct xfrm6_tunnel {
1428 int (*handler)(struct sk_buff *skb);
1429 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1430 u8 type, u8 code, int offset, __be32 info);
1431 struct xfrm6_tunnel __rcu *next;
1435 void xfrm_init(void);
1436 void xfrm4_init(void);
1437 int xfrm_state_init(struct net *net);
1438 void xfrm_state_fini(struct net *net);
1439 void xfrm4_state_init(void);
1440 void xfrm4_protocol_init(void);
1442 int xfrm6_init(void);
1443 void xfrm6_fini(void);
1444 int xfrm6_state_init(void);
1445 void xfrm6_state_fini(void);
1446 int xfrm6_protocol_init(void);
1447 void xfrm6_protocol_fini(void);
1449 static inline int xfrm6_init(void)
1453 static inline void xfrm6_fini(void)
1459 #ifdef CONFIG_XFRM_STATISTICS
1460 int xfrm_proc_init(struct net *net);
1461 void xfrm_proc_fini(struct net *net);
1464 int xfrm_sysctl_init(struct net *net);
1465 #ifdef CONFIG_SYSCTL
1466 void xfrm_sysctl_fini(struct net *net);
1468 static inline void xfrm_sysctl_fini(struct net *net)
1473 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1474 struct xfrm_address_filter *filter);
1475 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1476 int (*func)(struct xfrm_state *, int, void*), void *);
1477 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1478 struct xfrm_state *xfrm_state_alloc(struct net *net);
1479 void xfrm_state_free(struct xfrm_state *x);
1480 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1481 const xfrm_address_t *saddr,
1482 const struct flowi *fl,
1483 struct xfrm_tmpl *tmpl,
1484 struct xfrm_policy *pol, int *err,
1485 unsigned short family, u32 if_id);
1486 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1487 xfrm_address_t *daddr,
1488 xfrm_address_t *saddr,
1489 unsigned short family,
1490 u8 mode, u8 proto, u32 reqid);
1491 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1492 unsigned short family);
1493 int xfrm_state_check_expire(struct xfrm_state *x);
1494 void xfrm_state_insert(struct xfrm_state *x);
1495 int xfrm_state_add(struct xfrm_state *x);
1496 int xfrm_state_update(struct xfrm_state *x);
1497 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1498 const xfrm_address_t *daddr, __be32 spi,
1499 u8 proto, unsigned short family);
1500 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1501 const xfrm_address_t *daddr,
1502 const xfrm_address_t *saddr,
1504 unsigned short family);
1505 #ifdef CONFIG_XFRM_SUB_POLICY
1506 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1507 unsigned short family);
1508 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1509 unsigned short family);
1511 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1512 int n, unsigned short family)
1516 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1517 int n, unsigned short family)
1522 struct xfrmk_sadinfo {
1523 u32 sadhcnt; /* current hash bkts */
1524 u32 sadhmcnt; /* max allowed hash bkts */
1525 u32 sadcnt; /* current running count */
1528 struct xfrmk_spdinfo {
1539 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1540 int xfrm_state_delete(struct xfrm_state *x);
1541 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1542 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1543 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1544 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1545 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1546 int xfrm_init_replay(struct xfrm_state *x);
1547 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1548 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1549 int xfrm_init_state(struct xfrm_state *x);
1550 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1551 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1552 int xfrm_trans_queue(struct sk_buff *skb,
1553 int (*finish)(struct net *, struct sock *,
1555 int xfrm_output_resume(struct sk_buff *skb, int err);
1556 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1558 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1559 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1562 void xfrm_local_error(struct sk_buff *skb, int mtu);
1563 int xfrm4_extract_header(struct sk_buff *skb);
1564 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1565 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1567 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1568 int xfrm4_rcv(struct sk_buff *skb);
1569 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1571 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1573 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1574 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1575 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1576 return xfrm_input(skb, nexthdr, spi, 0);
1579 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
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_header(struct sk_buff *skb);
1588 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1589 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1591 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1592 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1593 int xfrm6_rcv(struct sk_buff *skb);
1594 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1595 xfrm_address_t *saddr, u8 proto);
1596 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1597 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1598 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1599 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1600 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1601 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1602 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1603 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
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 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1611 int xfrm_user_policy(struct sock *sk, int optname,
1612 u8 __user *optval, int optlen);
1614 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1616 return -ENOPROTOOPT;
1619 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1621 /* should not happen */
1627 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1628 const xfrm_address_t *saddr,
1629 const xfrm_address_t *daddr,
1630 int family, u32 mark);
1632 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1634 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1635 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1636 int (*func)(struct xfrm_policy *, int, int, void*),
1638 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1639 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1640 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1642 struct xfrm_selector *sel,
1643 struct xfrm_sec_ctx *ctx, int delete,
1645 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1646 int dir, u32 id, int delete, int *err);
1647 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1648 void xfrm_policy_hash_rebuild(struct net *net);
1649 u32 xfrm_get_acqseq(void);
1650 int verify_spi_info(u8 proto, u32 min, u32 max);
1651 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1652 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1653 u8 mode, u32 reqid, u32 if_id, u8 proto,
1654 const xfrm_address_t *daddr,
1655 const xfrm_address_t *saddr, int create,
1656 unsigned short family);
1657 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1659 #ifdef CONFIG_XFRM_MIGRATE
1660 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1661 const struct xfrm_migrate *m, int num_bundles,
1662 const struct xfrm_kmaddress *k,
1663 const struct xfrm_encap_tmpl *encap);
1664 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1665 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1666 struct xfrm_migrate *m,
1667 struct xfrm_encap_tmpl *encap);
1668 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1669 struct xfrm_migrate *m, int num_bundles,
1670 struct xfrm_kmaddress *k, struct net *net,
1671 struct xfrm_encap_tmpl *encap);
1674 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1675 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1676 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1677 xfrm_address_t *addr);
1679 void xfrm_input_init(void);
1680 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1682 void xfrm_probe_algs(void);
1683 int xfrm_count_pfkey_auth_supported(void);
1684 int xfrm_count_pfkey_enc_supported(void);
1685 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1686 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1687 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1688 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1689 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1690 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1691 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1692 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1693 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1696 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1697 const xfrm_address_t *b)
1699 return ipv6_addr_equal((const struct in6_addr *)a,
1700 (const struct in6_addr *)b);
1703 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1704 const xfrm_address_t *b,
1710 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1712 return xfrm6_addr_equal(a, b);
1716 static inline int xfrm_policy_id2dir(u32 index)
1722 static inline int xfrm_aevent_is_on(struct net *net)
1728 nlsk = rcu_dereference(net->xfrm.nlsk);
1730 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1735 static inline int xfrm_acquire_is_on(struct net *net)
1741 nlsk = rcu_dereference(net->xfrm.nlsk);
1743 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1750 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1752 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1755 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1757 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1760 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1762 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1765 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1767 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1770 #ifdef CONFIG_XFRM_MIGRATE
1771 static inline int xfrm_replay_clone(struct xfrm_state *x,
1772 struct xfrm_state *orig)
1774 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1779 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1780 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1782 x->preplay_esn = kmemdup(x->replay_esn,
1783 xfrm_replay_state_esn_len(x->replay_esn),
1785 if (!x->preplay_esn) {
1786 kfree(x->replay_esn);
1793 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1795 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1799 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1801 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1804 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1806 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1809 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1812 for (i = 0; i < n; i++)
1813 xfrm_state_put(*(states + i));
1816 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1819 for (i = 0; i < n; i++)
1820 xfrm_state_delete(*(states + i));
1825 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1827 struct sec_path *sp = skb_sec_path(skb);
1829 return sp->xvec[sp->len - 1];
1833 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1836 struct sec_path *sp = skb_sec_path(skb);
1838 if (!sp || !sp->olen || sp->len != sp->olen)
1841 return &sp->ovec[sp->olen - 1];
1847 void __init xfrm_dev_init(void);
1849 #ifdef CONFIG_XFRM_OFFLOAD
1850 void xfrm_dev_resume(struct sk_buff *skb);
1851 void xfrm_dev_backlog(struct softnet_data *sd);
1852 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1853 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1854 struct xfrm_user_offload *xuo);
1855 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1857 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1859 struct xfrm_state_offload *xso = &x->xso;
1861 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1862 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1865 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1867 struct xfrm_state *x = dst->xfrm;
1868 struct xfrm_dst *xdst;
1870 if (!x || !x->type_offload)
1873 xdst = (struct xfrm_dst *) dst;
1874 if (!x->xso.offload_handle && !xdst->child->xfrm)
1876 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1883 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1885 struct xfrm_state_offload *xso = &x->xso;
1888 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1891 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1893 struct xfrm_state_offload *xso = &x->xso;
1894 struct net_device *dev = xso->dev;
1896 if (dev && dev->xfrmdev_ops) {
1897 if (dev->xfrmdev_ops->xdo_dev_state_free)
1898 dev->xfrmdev_ops->xdo_dev_state_free(x);
1904 static inline void xfrm_dev_resume(struct sk_buff *skb)
1908 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1912 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1917 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1922 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1926 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1930 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1935 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1939 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1945 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1947 if (attrs[XFRMA_MARK])
1948 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1955 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1960 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1964 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1966 struct xfrm_mark *m = &x->props.smark;
1968 return (m->v & m->m) | (mark & ~m->m);
1971 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1976 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1980 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1981 unsigned int family)
1983 bool tunnel = false;
1987 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1991 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1995 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2000 #endif /* _NET_XFRM_H */