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;
135 /* Full description of state of transformer. */
137 possible_net_t xs_net;
139 struct hlist_node gclist;
140 struct hlist_node bydst;
142 struct hlist_node bysrc;
143 struct hlist_node byspi;
149 struct xfrm_selector sel;
150 struct xfrm_mark mark;
156 /* Key manager bits */
157 struct xfrm_state_walk km;
159 /* Parameters of this state. */
164 u8 aalgo, ealgo, calgo;
167 xfrm_address_t saddr;
171 struct xfrm_mark smark;
174 struct xfrm_lifetime_cfg lft;
176 /* Data for transformer */
177 struct xfrm_algo_auth *aalg;
178 struct xfrm_algo *ealg;
179 struct xfrm_algo *calg;
180 struct xfrm_algo_aead *aead;
183 /* Data for encapsulator */
184 struct xfrm_encap_tmpl *encap;
186 /* Data for care-of address */
187 xfrm_address_t *coaddr;
189 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
190 struct xfrm_state *tunnel;
192 /* If a tunnel, number of users + 1 */
193 atomic_t tunnel_users;
195 /* State for replay detection */
196 struct xfrm_replay_state replay;
197 struct xfrm_replay_state_esn *replay_esn;
199 /* Replay detection state at the time we sent the last notification */
200 struct xfrm_replay_state preplay;
201 struct xfrm_replay_state_esn *preplay_esn;
203 /* The functions for replay detection. */
204 const struct xfrm_replay *repl;
206 /* internal flag that only holds state for delayed aevent at the
211 /* Replay detection notification settings */
215 /* Replay detection notification timer */
216 struct timer_list rtimer;
219 struct xfrm_stats stats;
221 struct xfrm_lifetime_cur curlft;
222 struct hrtimer mtimer;
224 struct xfrm_state_offload xso;
226 /* used to fix curlft->add_time when changing date */
232 struct page_frag xfrag;
234 /* Reference to data common to all the instances of this
236 const struct xfrm_type *type;
237 struct xfrm_mode *inner_mode;
238 struct xfrm_mode *inner_mode_iaf;
239 struct xfrm_mode *outer_mode;
241 const struct xfrm_type_offload *type_offload;
243 /* Security context */
244 struct xfrm_sec_ctx *security;
246 /* Private data of this transformer, format is opaque,
247 * interpreted by xfrm_type methods. */
251 static inline struct net *xs_net(struct xfrm_state *x)
253 return read_pnet(&x->xs_net);
256 /* xflags - make enum if more show up */
257 #define XFRM_TIME_DEFER 1
258 #define XFRM_SOFT_EXPIRE 2
269 /* callback structure passed from either netlink or pfkey */
286 void (*advance)(struct xfrm_state *x, __be32 net_seq);
287 int (*check)(struct xfrm_state *x,
290 int (*recheck)(struct xfrm_state *x,
293 void (*notify)(struct xfrm_state *x, int event);
294 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
298 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
299 unsigned short family);
302 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
303 void xfrm_if_unregister_cb(void);
308 struct xfrm_policy_afinfo {
309 struct dst_ops *dst_ops;
310 struct dst_entry *(*dst_lookup)(struct net *net,
312 const xfrm_address_t *saddr,
313 const xfrm_address_t *daddr,
315 int (*get_saddr)(struct net *net, int oif,
316 xfrm_address_t *saddr,
317 xfrm_address_t *daddr,
319 void (*decode_session)(struct sk_buff *skb,
322 int (*get_tos)(const struct flowi *fl);
323 int (*init_path)(struct xfrm_dst *path,
324 struct dst_entry *dst,
326 int (*fill_dst)(struct xfrm_dst *xdst,
327 struct net_device *dev,
328 const struct flowi *fl);
329 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
332 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
333 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
334 void km_policy_notify(struct xfrm_policy *xp, int dir,
335 const struct km_event *c);
336 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
339 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
340 struct xfrm_policy *pol);
341 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
342 int __xfrm_state_delete(struct xfrm_state *x);
344 struct xfrm_state_afinfo {
348 struct module *owner;
349 const struct xfrm_type *type_map[IPPROTO_MAX];
350 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX];
351 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
353 int (*init_flags)(struct xfrm_state *x);
354 void (*init_tempsel)(struct xfrm_selector *sel,
355 const struct flowi *fl);
356 void (*init_temprop)(struct xfrm_state *x,
357 const struct xfrm_tmpl *tmpl,
358 const xfrm_address_t *daddr,
359 const xfrm_address_t *saddr);
360 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
361 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
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 **);
407 /* Estimate maximal size of result of transformation of a dgram */
408 u32 (*get_mtu)(struct xfrm_state *, int size);
411 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
412 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
414 struct xfrm_type_offload {
416 struct module *owner;
418 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
419 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
420 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
423 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
424 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
428 * Remove encapsulation header.
430 * The IP header will be moved over the top of the encapsulation
433 * On entry, the transport header shall point to where the IP header
434 * should be and the network header shall be set to where the IP
435 * header currently is. skb->data shall point to the start of the
438 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
441 * This is the actual input entry point.
443 * For transport mode and equivalent this would be identical to
444 * input2 (which does not need to be set). While tunnel mode
445 * and equivalent would set this to the tunnel encapsulation function
446 * xfrm4_prepare_input that would in turn call input2.
448 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
451 * Add encapsulation header.
453 * On exit, the transport header will be set to the start of the
454 * encapsulation header to be filled in by x->type->output and
455 * the mac header will be set to the nextheader (protocol for
456 * IPv4) field of the extension header directly preceding the
457 * encapsulation header, or in its absence, that of the top IP
458 * header. The value of the network header will always point
459 * to the top IP header while skb->data will point to the payload.
461 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
464 * This is the actual output entry point.
466 * For transport mode and equivalent this would be identical to
467 * output2 (which does not need to be set). While tunnel mode
468 * and equivalent would set this to a tunnel encapsulation function
469 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
472 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
475 * Adjust pointers into the packet and do GSO segmentation.
477 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
480 * Adjust pointers into the packet when IPsec is done at layer2.
482 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
484 struct xfrm_state_afinfo *afinfo;
485 struct module *owner;
490 /* Flags for xfrm_mode. */
492 XFRM_MODE_FLAG_TUNNEL = 1,
495 int xfrm_register_mode(struct xfrm_mode *mode, int family);
496 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
498 static inline int xfrm_af2proto(unsigned int family)
510 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
512 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
513 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
514 return x->inner_mode;
516 return x->inner_mode_iaf;
520 /* id in template is interpreted as:
521 * daddr - destination of tunnel, may be zero for transport mode.
522 * spi - zero to acquire spi. Not zero if spi is static, then
523 * daddr must be fixed too.
524 * proto - AH/ESP/IPCOMP
528 /* Source address of tunnel. Ignored, if it is not a tunnel. */
529 xfrm_address_t saddr;
531 unsigned short encap_family;
535 /* Mode: transport, tunnel etc. */
538 /* Sharing mode: unique, this session only, this user only etc. */
541 /* May skip this transfomration if no SA is found */
544 /* Skip aalgos/ealgos/calgos checks. */
547 /* Bit mask of algos allowed for acquisition */
553 #define XFRM_MAX_DEPTH 6
554 #define XFRM_MAX_OFFLOAD_DEPTH 1
556 struct xfrm_policy_walk_entry {
557 struct list_head all;
561 struct xfrm_policy_walk {
562 struct xfrm_policy_walk_entry walk;
567 struct xfrm_policy_queue {
568 struct sk_buff_head hold_queue;
569 struct timer_list hold_timer;
570 unsigned long timeout;
574 possible_net_t xp_net;
575 struct hlist_node bydst;
576 struct hlist_node byidx;
578 /* This lock only affects elements except for entry. */
582 struct timer_list timer;
588 struct xfrm_mark mark;
589 struct xfrm_selector selector;
590 struct xfrm_lifetime_cfg lft;
591 struct xfrm_lifetime_cur curlft;
592 struct xfrm_policy_walk_entry walk;
593 struct xfrm_policy_queue polq;
600 struct xfrm_sec_ctx *security;
601 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
602 struct hlist_node bydst_inexact_list;
606 static inline struct net *xp_net(const struct xfrm_policy *xp)
608 return read_pnet(&xp->xp_net);
611 struct xfrm_kmaddress {
612 xfrm_address_t local;
613 xfrm_address_t remote;
618 struct xfrm_migrate {
619 xfrm_address_t old_daddr;
620 xfrm_address_t old_saddr;
621 xfrm_address_t new_daddr;
622 xfrm_address_t new_saddr;
631 #define XFRM_KM_TIMEOUT 30
633 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
634 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
636 /* default aevent timeout in units of 100ms */
637 #define XFRM_AE_ETIME 10
638 /* Async Event timer multiplier */
639 #define XFRM_AE_ETH_M 10
640 /* default seq threshold size */
641 #define XFRM_AE_SEQT_SIZE 2
644 struct list_head list;
645 int (*notify)(struct xfrm_state *x, const struct km_event *c);
646 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
647 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
648 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
649 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
650 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
651 int (*migrate)(const struct xfrm_selector *sel,
653 const struct xfrm_migrate *m,
655 const struct xfrm_kmaddress *k,
656 const struct xfrm_encap_tmpl *encap);
657 bool (*is_alive)(const struct km_event *c);
660 int xfrm_register_km(struct xfrm_mgr *km);
661 int xfrm_unregister_km(struct xfrm_mgr *km);
663 struct xfrm_tunnel_skb_cb {
665 struct inet_skb_parm h4;
666 struct inet6_skb_parm h6;
670 struct ip_tunnel *ip4;
675 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
678 * This structure is used for the duration where packets are being
679 * transformed by IPsec. As soon as the packet leaves IPsec the
680 * area beyond the generic IP part may be overwritten.
683 struct xfrm_tunnel_skb_cb header;
685 /* Sequence number for replay protection. */
698 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
701 * This structure is used by the afinfo prepare_input/prepare_output functions
702 * to transmit header information to the mode input/output functions.
704 struct xfrm_mode_skb_cb {
705 struct xfrm_tunnel_skb_cb header;
707 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
711 /* IP header length (excluding options or extension headers). */
714 /* TOS for IPv4, class for IPv6. */
717 /* TTL for IPv4, hop limitfor IPv6. */
720 /* Protocol for IPv4, NH for IPv6. */
723 /* Option length for IPv4, zero for IPv6. */
726 /* Used by IPv6 only, zero for IPv4. */
730 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
733 * This structure is used by the input processing to locate the SPI and
734 * related information.
736 struct xfrm_spi_skb_cb {
737 struct xfrm_tunnel_skb_cb header;
739 unsigned int daddroff;
744 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
746 #ifdef CONFIG_AUDITSYSCALL
747 static inline struct audit_buffer *xfrm_audit_start(const char *op)
749 struct audit_buffer *audit_buf = NULL;
751 if (audit_enabled == AUDIT_OFF)
753 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
754 AUDIT_MAC_IPSEC_EVENT);
755 if (audit_buf == NULL)
757 audit_log_format(audit_buf, "op=%s", op);
761 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
762 struct audit_buffer *audit_buf)
764 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
765 audit_get_loginuid(current) :
767 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
770 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
771 audit_log_task_context(audit_buf);
774 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
775 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
777 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
778 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
779 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
780 struct sk_buff *skb);
781 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
783 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
784 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
786 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
790 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
795 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
800 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
805 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
810 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
815 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
816 struct sk_buff *skb, __be32 net_seq)
820 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
825 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
826 __be32 net_spi, __be32 net_seq)
830 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
831 struct sk_buff *skb, u8 proto)
834 #endif /* CONFIG_AUDITSYSCALL */
836 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
838 if (likely(policy != NULL))
839 refcount_inc(&policy->refcnt);
842 void xfrm_policy_destroy(struct xfrm_policy *policy);
844 static inline void xfrm_pol_put(struct xfrm_policy *policy)
846 if (refcount_dec_and_test(&policy->refcnt))
847 xfrm_policy_destroy(policy);
850 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
853 for (i = npols - 1; i >= 0; --i)
854 xfrm_pol_put(pols[i]);
857 void __xfrm_state_destroy(struct xfrm_state *, bool);
859 static inline void __xfrm_state_put(struct xfrm_state *x)
861 refcount_dec(&x->refcnt);
864 static inline void xfrm_state_put(struct xfrm_state *x)
866 if (refcount_dec_and_test(&x->refcnt))
867 __xfrm_state_destroy(x, false);
870 static inline void xfrm_state_put_sync(struct xfrm_state *x)
872 if (refcount_dec_and_test(&x->refcnt))
873 __xfrm_state_destroy(x, true);
876 static inline void xfrm_state_hold(struct xfrm_state *x)
878 refcount_inc(&x->refcnt);
881 static inline bool addr_match(const void *token1, const void *token2,
882 unsigned int prefixlen)
884 const __be32 *a1 = token1;
885 const __be32 *a2 = token2;
889 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
890 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
893 if (memcmp(a1, a2, pdw << 2))
899 mask = htonl((0xffffffff) << (32 - pbi));
901 if ((a1[pdw] ^ a2[pdw]) & mask)
908 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
910 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
911 if (sizeof(long) == 4 && prefixlen == 0)
913 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
917 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
920 switch(fl->flowi_proto) {
923 case IPPROTO_UDPLITE:
925 port = uli->ports.sport;
929 port = htons(uli->icmpt.type);
932 port = htons(uli->mht.type);
935 port = htons(ntohl(uli->gre_key) >> 16);
944 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
947 switch(fl->flowi_proto) {
950 case IPPROTO_UDPLITE:
952 port = uli->ports.dport;
956 port = htons(uli->icmpt.code);
959 port = htons(ntohl(uli->gre_key) & 0xffff);
967 bool xfrm_selector_match(const struct xfrm_selector *sel,
968 const struct flowi *fl, unsigned short family);
970 #ifdef CONFIG_SECURITY_NETWORK_XFRM
971 /* If neither has a context --> match
972 * Otherwise, both must have a context and the sids, doi, alg must match
974 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
976 return ((!s1 && !s2) ||
978 (s1->ctx_sid == s2->ctx_sid) &&
979 (s1->ctx_doi == s2->ctx_doi) &&
980 (s1->ctx_alg == s2->ctx_alg)));
983 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
989 /* A struct encoding bundle of transformations to apply to some set of flow.
991 * xdst->child points to the next element of bundle.
992 * dst->xfrm points to an instanse of transformer.
994 * Due to unfortunate limitations of current routing cache, which we
995 * have no time to fix, it mirrors struct rtable and bound to the same
996 * routing key, including saddr,daddr. However, we can have many of
997 * bundles differing by session id. All the bundles grow from a parent
1002 struct dst_entry dst;
1004 struct rt6_info rt6;
1006 struct dst_entry *route;
1007 struct dst_entry *child;
1008 struct dst_entry *path;
1009 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1010 int num_pols, num_xfrms;
1013 u32 route_mtu_cached;
1014 u32 child_mtu_cached;
1019 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1023 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1028 return (struct dst_entry *) dst;
1031 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1035 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1043 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1045 xdst->child = child;
1048 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1050 xfrm_pols_put(xdst->pols, xdst->num_pols);
1051 dst_release(xdst->route);
1052 if (likely(xdst->u.dst.xfrm))
1053 xfrm_state_put(xdst->u.dst.xfrm);
1057 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1059 struct xfrm_if_parms {
1060 char name[IFNAMSIZ]; /* name of XFRM device */
1061 int link; /* ifindex of underlying L2 interface */
1062 u32 if_id; /* interface identifyer */
1066 struct xfrm_if __rcu *next; /* next interface in list */
1067 struct net_device *dev; /* virtual device associated with interface */
1068 struct net_device *phydev; /* physical device */
1069 struct net *net; /* netns for packet i/o */
1070 struct xfrm_if_parms p; /* interface parms */
1072 struct gro_cells gro_cells;
1075 struct xfrm_offload {
1076 /* Output sequence number for replay protection on offloading. */
1083 #define SA_DELETE_REQ 1
1084 #define CRYPTO_DONE 2
1085 #define CRYPTO_NEXT_DONE 4
1086 #define CRYPTO_FALLBACK 8
1087 #define XFRM_GSO_SEGMENT 16
1089 #define XFRM_ESP_NO_TRAILER 64
1090 #define XFRM_DEV_RESUME 128
1093 #define CRYPTO_SUCCESS 1
1094 #define CRYPTO_GENERIC_ERROR 2
1095 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1096 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1097 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1098 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1099 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1100 #define CRYPTO_INVALID_PROTOCOL 128
1109 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1110 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1113 struct sec_path *secpath_set(struct sk_buff *skb);
1116 secpath_reset(struct sk_buff *skb)
1119 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1124 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1128 return addr->a4 == 0;
1130 return ipv6_addr_any(&addr->in6);
1136 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1138 return (tmpl->saddr.a4 &&
1139 tmpl->saddr.a4 != x->props.saddr.a4);
1143 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1145 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1146 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1150 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1154 return __xfrm4_state_addr_cmp(tmpl, x);
1156 return __xfrm6_state_addr_cmp(tmpl, x);
1162 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1163 unsigned short family);
1165 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1166 struct sk_buff *skb,
1167 unsigned int family, int reverse)
1169 struct net *net = dev_net(skb->dev);
1170 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1172 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1173 return __xfrm_policy_check(sk, ndir, skb, family);
1175 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1176 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1177 __xfrm_policy_check(sk, ndir, skb, family);
1180 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1182 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1185 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1187 return xfrm_policy_check(sk, dir, skb, AF_INET);
1190 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1192 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1195 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1196 struct sk_buff *skb)
1198 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1201 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1202 struct sk_buff *skb)
1204 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1207 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1208 unsigned int family, int reverse);
1210 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1211 unsigned int family)
1213 return __xfrm_decode_session(skb, fl, family, 0);
1216 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1218 unsigned int family)
1220 return __xfrm_decode_session(skb, fl, family, 1);
1223 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1225 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1227 struct net *net = dev_net(skb->dev);
1229 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1230 (skb_dst(skb)->flags & DST_NOXFRM) ||
1231 __xfrm_route_forward(skb, family);
1234 static inline int xfrm4_route_forward(struct sk_buff *skb)
1236 return xfrm_route_forward(skb, AF_INET);
1239 static inline int xfrm6_route_forward(struct sk_buff *skb)
1241 return xfrm_route_forward(skb, AF_INET6);
1244 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1246 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1248 sk->sk_policy[0] = NULL;
1249 sk->sk_policy[1] = NULL;
1250 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1251 return __xfrm_sk_clone_policy(sk, osk);
1255 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1257 static inline void xfrm_sk_free_policy(struct sock *sk)
1259 struct xfrm_policy *pol;
1261 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1262 if (unlikely(pol != NULL)) {
1263 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1264 sk->sk_policy[0] = NULL;
1266 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1267 if (unlikely(pol != NULL)) {
1268 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1269 sk->sk_policy[1] = NULL;
1275 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1276 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1277 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1278 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1279 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1283 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1287 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1291 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1293 unsigned int family)
1297 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1298 struct sk_buff *skb)
1302 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1303 struct sk_buff *skb)
1310 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1314 return (xfrm_address_t *)&fl->u.ip4.daddr;
1316 return (xfrm_address_t *)&fl->u.ip6.daddr;
1322 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1326 return (xfrm_address_t *)&fl->u.ip4.saddr;
1328 return (xfrm_address_t *)&fl->u.ip6.saddr;
1334 void xfrm_flowi_addr_get(const struct flowi *fl,
1335 xfrm_address_t *saddr, xfrm_address_t *daddr,
1336 unsigned short family)
1340 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1341 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1344 saddr->in6 = fl->u.ip6.saddr;
1345 daddr->in6 = fl->u.ip6.daddr;
1350 static __inline__ int
1351 __xfrm4_state_addr_check(const struct xfrm_state *x,
1352 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1354 if (daddr->a4 == x->id.daddr.a4 &&
1355 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1360 static __inline__ int
1361 __xfrm6_state_addr_check(const struct xfrm_state *x,
1362 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1364 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1365 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1366 ipv6_addr_any((struct in6_addr *)saddr) ||
1367 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1372 static __inline__ int
1373 xfrm_state_addr_check(const struct xfrm_state *x,
1374 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1375 unsigned short family)
1379 return __xfrm4_state_addr_check(x, daddr, saddr);
1381 return __xfrm6_state_addr_check(x, daddr, saddr);
1386 static __inline__ int
1387 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1388 unsigned short family)
1392 return __xfrm4_state_addr_check(x,
1393 (const xfrm_address_t *)&fl->u.ip4.daddr,
1394 (const xfrm_address_t *)&fl->u.ip4.saddr);
1396 return __xfrm6_state_addr_check(x,
1397 (const xfrm_address_t *)&fl->u.ip6.daddr,
1398 (const xfrm_address_t *)&fl->u.ip6.saddr);
1403 static inline int xfrm_state_kern(const struct xfrm_state *x)
1405 return atomic_read(&x->tunnel_users);
1408 static inline bool xfrm_id_proto_valid(u8 proto)
1414 #if IS_ENABLED(CONFIG_IPV6)
1415 case IPPROTO_ROUTING:
1416 case IPPROTO_DSTOPTS:
1424 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1425 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1427 return (!userproto || proto == userproto ||
1428 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1429 proto == IPPROTO_ESP ||
1430 proto == IPPROTO_COMP)));
1434 * xfrm algorithm information
1436 struct xfrm_algo_aead_info {
1441 struct xfrm_algo_auth_info {
1446 struct xfrm_algo_encr_info {
1452 struct xfrm_algo_comp_info {
1456 struct xfrm_algo_desc {
1460 u8 pfkey_supported:1;
1462 struct xfrm_algo_aead_info aead;
1463 struct xfrm_algo_auth_info auth;
1464 struct xfrm_algo_encr_info encr;
1465 struct xfrm_algo_comp_info comp;
1467 struct sadb_alg desc;
1470 /* XFRM protocol handlers. */
1471 struct xfrm4_protocol {
1472 int (*handler)(struct sk_buff *skb);
1473 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1475 int (*cb_handler)(struct sk_buff *skb, int err);
1476 int (*err_handler)(struct sk_buff *skb, u32 info);
1478 struct xfrm4_protocol __rcu *next;
1482 struct xfrm6_protocol {
1483 int (*handler)(struct sk_buff *skb);
1484 int (*cb_handler)(struct sk_buff *skb, int err);
1485 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1486 u8 type, u8 code, int offset, __be32 info);
1488 struct xfrm6_protocol __rcu *next;
1492 /* XFRM tunnel handlers. */
1493 struct xfrm_tunnel {
1494 int (*handler)(struct sk_buff *skb);
1495 int (*err_handler)(struct sk_buff *skb, u32 info);
1497 struct xfrm_tunnel __rcu *next;
1501 struct xfrm6_tunnel {
1502 int (*handler)(struct sk_buff *skb);
1503 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1504 u8 type, u8 code, int offset, __be32 info);
1505 struct xfrm6_tunnel __rcu *next;
1509 void xfrm_init(void);
1510 void xfrm4_init(void);
1511 int xfrm_state_init(struct net *net);
1512 void xfrm_state_fini(struct net *net);
1513 void xfrm4_state_init(void);
1514 void xfrm4_protocol_init(void);
1516 int xfrm6_init(void);
1517 void xfrm6_fini(void);
1518 int xfrm6_state_init(void);
1519 void xfrm6_state_fini(void);
1520 int xfrm6_protocol_init(void);
1521 void xfrm6_protocol_fini(void);
1523 static inline int xfrm6_init(void)
1527 static inline void xfrm6_fini(void)
1533 #ifdef CONFIG_XFRM_STATISTICS
1534 int xfrm_proc_init(struct net *net);
1535 void xfrm_proc_fini(struct net *net);
1538 int xfrm_sysctl_init(struct net *net);
1539 #ifdef CONFIG_SYSCTL
1540 void xfrm_sysctl_fini(struct net *net);
1542 static inline void xfrm_sysctl_fini(struct net *net)
1547 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1548 struct xfrm_address_filter *filter);
1549 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1550 int (*func)(struct xfrm_state *, int, void*), void *);
1551 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1552 struct xfrm_state *xfrm_state_alloc(struct net *net);
1553 void xfrm_state_free(struct xfrm_state *x);
1554 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1555 const xfrm_address_t *saddr,
1556 const struct flowi *fl,
1557 struct xfrm_tmpl *tmpl,
1558 struct xfrm_policy *pol, int *err,
1559 unsigned short family, u32 if_id);
1560 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1561 xfrm_address_t *daddr,
1562 xfrm_address_t *saddr,
1563 unsigned short family,
1564 u8 mode, u8 proto, u32 reqid);
1565 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1566 unsigned short family);
1567 int xfrm_state_check_expire(struct xfrm_state *x);
1568 void xfrm_state_insert(struct xfrm_state *x);
1569 int xfrm_state_add(struct xfrm_state *x);
1570 int xfrm_state_update(struct xfrm_state *x);
1571 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1572 const xfrm_address_t *daddr, __be32 spi,
1573 u8 proto, unsigned short family);
1574 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1575 const xfrm_address_t *daddr,
1576 const xfrm_address_t *saddr,
1578 unsigned short family);
1579 #ifdef CONFIG_XFRM_SUB_POLICY
1580 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1581 unsigned short family, struct net *net);
1582 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1583 unsigned short family);
1585 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1586 int n, unsigned short family, struct net *net)
1591 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1592 int n, unsigned short family)
1598 struct xfrmk_sadinfo {
1599 u32 sadhcnt; /* current hash bkts */
1600 u32 sadhmcnt; /* max allowed hash bkts */
1601 u32 sadcnt; /* current running count */
1604 struct xfrmk_spdinfo {
1615 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1616 int xfrm_state_delete(struct xfrm_state *x);
1617 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1618 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1619 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1620 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1621 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1622 int xfrm_init_replay(struct xfrm_state *x);
1623 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1624 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1625 int xfrm_init_state(struct xfrm_state *x);
1626 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1627 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1628 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1629 int xfrm_trans_queue(struct sk_buff *skb,
1630 int (*finish)(struct net *, struct sock *,
1632 int xfrm_output_resume(struct sk_buff *skb, int err);
1633 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1634 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1635 void xfrm_local_error(struct sk_buff *skb, int mtu);
1636 int xfrm4_extract_header(struct sk_buff *skb);
1637 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1638 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1640 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1641 int xfrm4_rcv(struct sk_buff *skb);
1642 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1644 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1646 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1647 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1648 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1649 return xfrm_input(skb, nexthdr, spi, 0);
1652 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1653 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1654 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1655 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1656 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1657 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1658 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1659 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1660 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1661 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1662 int xfrm6_extract_header(struct sk_buff *skb);
1663 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1664 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1666 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1667 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1668 int xfrm6_rcv(struct sk_buff *skb);
1669 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1670 xfrm_address_t *saddr, u8 proto);
1671 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1672 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1673 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1674 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1675 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1676 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1677 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1678 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1679 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1680 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1681 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1682 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1683 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1687 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1688 int xfrm_user_policy(struct sock *sk, int optname,
1689 u8 __user *optval, int optlen);
1691 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1693 return -ENOPROTOOPT;
1696 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1698 /* should not happen */
1704 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1705 const xfrm_address_t *saddr,
1706 const xfrm_address_t *daddr,
1707 int family, u32 mark);
1709 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1711 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1712 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1713 int (*func)(struct xfrm_policy *, int, int, void*),
1715 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1716 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1717 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1719 struct xfrm_selector *sel,
1720 struct xfrm_sec_ctx *ctx, int delete,
1722 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1723 int dir, u32 id, int delete, int *err);
1724 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1725 void xfrm_policy_hash_rebuild(struct net *net);
1726 u32 xfrm_get_acqseq(void);
1727 int verify_spi_info(u8 proto, u32 min, u32 max);
1728 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1729 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1730 u8 mode, u32 reqid, u32 if_id, u8 proto,
1731 const xfrm_address_t *daddr,
1732 const xfrm_address_t *saddr, int create,
1733 unsigned short family);
1734 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1736 #ifdef CONFIG_XFRM_MIGRATE
1737 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1738 const struct xfrm_migrate *m, int num_bundles,
1739 const struct xfrm_kmaddress *k,
1740 const struct xfrm_encap_tmpl *encap);
1741 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1742 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1743 struct xfrm_migrate *m,
1744 struct xfrm_encap_tmpl *encap);
1745 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1746 struct xfrm_migrate *m, int num_bundles,
1747 struct xfrm_kmaddress *k, struct net *net,
1748 struct xfrm_encap_tmpl *encap);
1751 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1752 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1753 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1754 xfrm_address_t *addr);
1756 void xfrm_input_init(void);
1757 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1759 void xfrm_probe_algs(void);
1760 int xfrm_count_pfkey_auth_supported(void);
1761 int xfrm_count_pfkey_enc_supported(void);
1762 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1763 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1764 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1765 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1766 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1767 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1768 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1769 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1770 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1773 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1774 const xfrm_address_t *b)
1776 return ipv6_addr_equal((const struct in6_addr *)a,
1777 (const struct in6_addr *)b);
1780 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1781 const xfrm_address_t *b,
1787 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1789 return xfrm6_addr_equal(a, b);
1793 static inline int xfrm_policy_id2dir(u32 index)
1799 static inline int xfrm_aevent_is_on(struct net *net)
1805 nlsk = rcu_dereference(net->xfrm.nlsk);
1807 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1812 static inline int xfrm_acquire_is_on(struct net *net)
1818 nlsk = rcu_dereference(net->xfrm.nlsk);
1820 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1827 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1829 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1832 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1834 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1837 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1839 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1842 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1844 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1847 #ifdef CONFIG_XFRM_MIGRATE
1848 static inline int xfrm_replay_clone(struct xfrm_state *x,
1849 struct xfrm_state *orig)
1851 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1856 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1857 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1859 x->preplay_esn = kmemdup(x->replay_esn,
1860 xfrm_replay_state_esn_len(x->replay_esn),
1862 if (!x->preplay_esn) {
1863 kfree(x->replay_esn);
1870 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1872 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1876 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1878 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1881 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1883 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1886 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1889 for (i = 0; i < n; i++)
1890 xfrm_state_put(*(states + i));
1893 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1896 for (i = 0; i < n; i++)
1897 xfrm_state_delete(*(states + i));
1902 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1904 struct sec_path *sp = skb_sec_path(skb);
1906 return sp->xvec[sp->len - 1];
1910 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1913 struct sec_path *sp = skb_sec_path(skb);
1915 if (!sp || !sp->olen || sp->len != sp->olen)
1918 return &sp->ovec[sp->olen - 1];
1924 void __init xfrm_dev_init(void);
1926 #ifdef CONFIG_XFRM_OFFLOAD
1927 void xfrm_dev_resume(struct sk_buff *skb);
1928 void xfrm_dev_backlog(struct softnet_data *sd);
1929 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1930 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1931 struct xfrm_user_offload *xuo);
1932 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1934 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1936 struct xfrm_state_offload *xso = &x->xso;
1938 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1939 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1942 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1944 struct xfrm_state *x = dst->xfrm;
1945 struct xfrm_dst *xdst;
1947 if (!x || !x->type_offload)
1950 xdst = (struct xfrm_dst *) dst;
1951 if (!x->xso.offload_handle && !xdst->child->xfrm)
1953 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1960 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1962 struct xfrm_state_offload *xso = &x->xso;
1965 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1968 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1970 struct xfrm_state_offload *xso = &x->xso;
1971 struct net_device *dev = xso->dev;
1973 if (dev && dev->xfrmdev_ops) {
1974 if (dev->xfrmdev_ops->xdo_dev_state_free)
1975 dev->xfrmdev_ops->xdo_dev_state_free(x);
1981 static inline void xfrm_dev_resume(struct sk_buff *skb)
1985 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1989 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1994 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1999 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2003 static inline void xfrm_dev_state_free(struct xfrm_state *x)
2007 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2012 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2016 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2022 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2024 if (attrs[XFRMA_MARK])
2025 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2032 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2037 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2041 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2043 struct xfrm_mark *m = &x->props.smark;
2045 return (m->v & m->m) | (mark & ~m->m);
2048 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2053 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2057 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2058 unsigned int family)
2060 bool tunnel = false;
2064 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2068 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2072 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2077 #endif /* _NET_XFRM_H */