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>
27 #include <linux/interrupt.h>
29 #ifdef CONFIG_XFRM_STATISTICS
33 #define XFRM_PROTO_ESP 50
34 #define XFRM_PROTO_AH 51
35 #define XFRM_PROTO_COMP 108
36 #define XFRM_PROTO_IPIP 4
37 #define XFRM_PROTO_IPV6 41
38 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
39 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
41 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
42 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
43 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
44 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
45 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
46 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
47 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
50 #ifdef CONFIG_XFRM_STATISTICS
51 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
53 #define XFRM_INC_STATS(net, field) ((void)(net))
57 /* Organization of SPD aka "XFRM rules"
58 ------------------------------------
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71 Lookup is plain linear search until the first match with selector.
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 Bundles are cached at xrfm_policy struct (field ->bundles).
88 Resolution of xrfm_tmpl
89 -----------------------
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 struct xfrm_state_walk {
119 struct list_head all;
124 struct xfrm_address_filter *filter;
127 struct xfrm_state_offload {
128 struct net_device *dev;
129 unsigned long offload_handle;
130 unsigned int num_exthdrs;
134 /* Full description of state of transformer. */
136 possible_net_t xs_net;
138 struct hlist_node gclist;
139 struct hlist_node bydst;
141 struct hlist_node bysrc;
142 struct hlist_node byspi;
148 struct xfrm_selector sel;
149 struct xfrm_mark mark;
154 /* Key manager bits */
155 struct xfrm_state_walk km;
157 /* Parameters of this state. */
162 u8 aalgo, ealgo, calgo;
165 xfrm_address_t saddr;
172 struct xfrm_lifetime_cfg lft;
174 /* Data for transformer */
175 struct xfrm_algo_auth *aalg;
176 struct xfrm_algo *ealg;
177 struct xfrm_algo *calg;
178 struct xfrm_algo_aead *aead;
181 /* Data for encapsulator */
182 struct xfrm_encap_tmpl *encap;
184 /* Data for care-of address */
185 xfrm_address_t *coaddr;
187 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
188 struct xfrm_state *tunnel;
190 /* If a tunnel, number of users + 1 */
191 atomic_t tunnel_users;
193 /* State for replay detection */
194 struct xfrm_replay_state replay;
195 struct xfrm_replay_state_esn *replay_esn;
197 /* Replay detection state at the time we sent the last notification */
198 struct xfrm_replay_state preplay;
199 struct xfrm_replay_state_esn *preplay_esn;
201 /* The functions for replay detection. */
202 const struct xfrm_replay *repl;
204 /* internal flag that only holds state for delayed aevent at the
209 /* Replay detection notification settings */
213 /* Replay detection notification timer */
214 struct timer_list rtimer;
217 struct xfrm_stats stats;
219 struct xfrm_lifetime_cur curlft;
220 struct tasklet_hrtimer mtimer;
222 struct xfrm_state_offload xso;
224 /* used to fix curlft->add_time when changing date */
228 unsigned long lastused;
230 struct page_frag xfrag;
232 /* Reference to data common to all the instances of this
234 const struct xfrm_type *type;
235 struct xfrm_mode *inner_mode;
236 struct xfrm_mode *inner_mode_iaf;
237 struct xfrm_mode *outer_mode;
239 const struct xfrm_type_offload *type_offload;
241 /* Security context */
242 struct xfrm_sec_ctx *security;
244 /* Private data of this transformer, format is opaque,
245 * interpreted by xfrm_type methods. */
249 static inline struct net *xs_net(struct xfrm_state *x)
251 return read_pnet(&x->xs_net);
254 /* xflags - make enum if more show up */
255 #define XFRM_TIME_DEFER 1
256 #define XFRM_SOFT_EXPIRE 2
267 /* callback structure passed from either netlink or pfkey */
284 void (*advance)(struct xfrm_state *x, __be32 net_seq);
285 int (*check)(struct xfrm_state *x,
288 int (*recheck)(struct xfrm_state *x,
291 void (*notify)(struct xfrm_state *x, int event);
292 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
298 struct xfrm_policy_afinfo {
299 struct dst_ops *dst_ops;
300 struct dst_entry *(*dst_lookup)(struct net *net,
302 const xfrm_address_t *saddr,
303 const xfrm_address_t *daddr,
305 int (*get_saddr)(struct net *net, int oif,
306 xfrm_address_t *saddr,
307 xfrm_address_t *daddr,
309 void (*decode_session)(struct sk_buff *skb,
312 int (*get_tos)(const struct flowi *fl);
313 int (*init_path)(struct xfrm_dst *path,
314 struct dst_entry *dst,
316 int (*fill_dst)(struct xfrm_dst *xdst,
317 struct net_device *dev,
318 const struct flowi *fl);
319 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
322 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
323 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
324 void km_policy_notify(struct xfrm_policy *xp, int dir,
325 const struct km_event *c);
326 void xfrm_policy_cache_flush(void);
327 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
330 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
331 struct xfrm_policy *pol);
332 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
333 int __xfrm_state_delete(struct xfrm_state *x);
335 struct xfrm_state_afinfo {
339 struct module *owner;
340 const struct xfrm_type *type_map[IPPROTO_MAX];
341 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX];
342 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
344 int (*init_flags)(struct xfrm_state *x);
345 void (*init_tempsel)(struct xfrm_selector *sel,
346 const struct flowi *fl);
347 void (*init_temprop)(struct xfrm_state *x,
348 const struct xfrm_tmpl *tmpl,
349 const xfrm_address_t *daddr,
350 const xfrm_address_t *saddr);
351 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
352 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
353 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
354 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
355 int (*extract_input)(struct xfrm_state *x,
356 struct sk_buff *skb);
357 int (*extract_output)(struct xfrm_state *x,
358 struct sk_buff *skb);
359 int (*transport_finish)(struct sk_buff *skb,
361 void (*local_error)(struct sk_buff *skb, u32 mtu);
364 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
365 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
366 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
367 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
369 struct xfrm_input_afinfo {
371 int (*callback)(struct sk_buff *skb, u8 protocol,
375 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
376 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
378 void xfrm_state_delete_tunnel(struct xfrm_state *x);
382 struct module *owner;
385 #define XFRM_TYPE_NON_FRAGMENT 1
386 #define XFRM_TYPE_REPLAY_PROT 2
387 #define XFRM_TYPE_LOCAL_COADDR 4
388 #define XFRM_TYPE_REMOTE_COADDR 8
390 int (*init_state)(struct xfrm_state *x);
391 void (*destructor)(struct xfrm_state *);
392 int (*input)(struct xfrm_state *, struct sk_buff *skb);
393 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
394 int (*reject)(struct xfrm_state *, struct sk_buff *,
395 const struct flowi *);
396 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
397 /* Estimate maximal size of result of transformation of a dgram */
398 u32 (*get_mtu)(struct xfrm_state *, int size);
401 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
402 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
404 struct xfrm_type_offload {
406 struct module *owner;
408 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
409 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
410 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
413 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
414 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
418 * Remove encapsulation header.
420 * The IP header will be moved over the top of the encapsulation
423 * On entry, the transport header shall point to where the IP header
424 * should be and the network header shall be set to where the IP
425 * header currently is. skb->data shall point to the start of the
428 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
431 * This is the actual input entry point.
433 * For transport mode and equivalent this would be identical to
434 * input2 (which does not need to be set). While tunnel mode
435 * and equivalent would set this to the tunnel encapsulation function
436 * xfrm4_prepare_input that would in turn call input2.
438 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
441 * Add encapsulation header.
443 * On exit, the transport header will be set to the start of the
444 * encapsulation header to be filled in by x->type->output and
445 * the mac header will be set to the nextheader (protocol for
446 * IPv4) field of the extension header directly preceding the
447 * encapsulation header, or in its absence, that of the top IP
448 * header. The value of the network header will always point
449 * to the top IP header while skb->data will point to the payload.
451 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
454 * This is the actual output entry point.
456 * For transport mode and equivalent this would be identical to
457 * output2 (which does not need to be set). While tunnel mode
458 * and equivalent would set this to a tunnel encapsulation function
459 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
462 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
465 * Adjust pointers into the packet and do GSO segmentation.
467 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
470 * Adjust pointers into the packet when IPsec is done at layer2.
472 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
474 struct xfrm_state_afinfo *afinfo;
475 struct module *owner;
480 /* Flags for xfrm_mode. */
482 XFRM_MODE_FLAG_TUNNEL = 1,
485 int xfrm_register_mode(struct xfrm_mode *mode, int family);
486 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
488 static inline int xfrm_af2proto(unsigned int family)
500 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
502 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
503 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
504 return x->inner_mode;
506 return x->inner_mode_iaf;
510 /* id in template is interpreted as:
511 * daddr - destination of tunnel, may be zero for transport mode.
512 * spi - zero to acquire spi. Not zero if spi is static, then
513 * daddr must be fixed too.
514 * proto - AH/ESP/IPCOMP
518 /* Source address of tunnel. Ignored, if it is not a tunnel. */
519 xfrm_address_t saddr;
521 unsigned short encap_family;
525 /* Mode: transport, tunnel etc. */
528 /* Sharing mode: unique, this session only, this user only etc. */
531 /* May skip this transfomration if no SA is found */
534 /* Skip aalgos/ealgos/calgos checks. */
537 /* Bit mask of algos allowed for acquisition */
543 #define XFRM_MAX_DEPTH 6
544 #define XFRM_MAX_OFFLOAD_DEPTH 1
546 struct xfrm_policy_walk_entry {
547 struct list_head all;
551 struct xfrm_policy_walk {
552 struct xfrm_policy_walk_entry walk;
557 struct xfrm_policy_queue {
558 struct sk_buff_head hold_queue;
559 struct timer_list hold_timer;
560 unsigned long timeout;
564 possible_net_t xp_net;
565 struct hlist_node bydst;
566 struct hlist_node byidx;
568 /* This lock only affects elements except for entry. */
571 struct timer_list timer;
576 struct xfrm_mark mark;
577 struct xfrm_selector selector;
578 struct xfrm_lifetime_cfg lft;
579 struct xfrm_lifetime_cur curlft;
580 struct xfrm_policy_walk_entry walk;
581 struct xfrm_policy_queue polq;
587 struct xfrm_sec_ctx *security;
588 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
592 static inline struct net *xp_net(const struct xfrm_policy *xp)
594 return read_pnet(&xp->xp_net);
597 struct xfrm_kmaddress {
598 xfrm_address_t local;
599 xfrm_address_t remote;
604 struct xfrm_migrate {
605 xfrm_address_t old_daddr;
606 xfrm_address_t old_saddr;
607 xfrm_address_t new_daddr;
608 xfrm_address_t new_saddr;
617 #define XFRM_KM_TIMEOUT 30
619 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
620 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
622 /* default aevent timeout in units of 100ms */
623 #define XFRM_AE_ETIME 10
624 /* Async Event timer multiplier */
625 #define XFRM_AE_ETH_M 10
626 /* default seq threshold size */
627 #define XFRM_AE_SEQT_SIZE 2
630 struct list_head list;
631 int (*notify)(struct xfrm_state *x, const struct km_event *c);
632 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
633 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
634 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
635 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
636 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
637 int (*migrate)(const struct xfrm_selector *sel,
639 const struct xfrm_migrate *m,
641 const struct xfrm_kmaddress *k,
642 const struct xfrm_encap_tmpl *encap);
643 bool (*is_alive)(const struct km_event *c);
646 int xfrm_register_km(struct xfrm_mgr *km);
647 int xfrm_unregister_km(struct xfrm_mgr *km);
649 struct xfrm_tunnel_skb_cb {
651 struct inet_skb_parm h4;
652 struct inet6_skb_parm h6;
656 struct ip_tunnel *ip4;
661 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
664 * This structure is used for the duration where packets are being
665 * transformed by IPsec. As soon as the packet leaves IPsec the
666 * area beyond the generic IP part may be overwritten.
669 struct xfrm_tunnel_skb_cb header;
671 /* Sequence number for replay protection. */
684 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
687 * This structure is used by the afinfo prepare_input/prepare_output functions
688 * to transmit header information to the mode input/output functions.
690 struct xfrm_mode_skb_cb {
691 struct xfrm_tunnel_skb_cb header;
693 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
697 /* IP header length (excluding options or extension headers). */
700 /* TOS for IPv4, class for IPv6. */
703 /* TTL for IPv4, hop limitfor IPv6. */
706 /* Protocol for IPv4, NH for IPv6. */
709 /* Option length for IPv4, zero for IPv6. */
712 /* Used by IPv6 only, zero for IPv4. */
716 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
719 * This structure is used by the input processing to locate the SPI and
720 * related information.
722 struct xfrm_spi_skb_cb {
723 struct xfrm_tunnel_skb_cb header;
725 unsigned int daddroff;
730 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
732 #ifdef CONFIG_AUDITSYSCALL
733 static inline struct audit_buffer *xfrm_audit_start(const char *op)
735 struct audit_buffer *audit_buf = NULL;
737 if (audit_enabled == 0)
739 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
740 AUDIT_MAC_IPSEC_EVENT);
741 if (audit_buf == NULL)
743 audit_log_format(audit_buf, "op=%s", op);
747 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
748 struct audit_buffer *audit_buf)
750 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
751 audit_get_loginuid(current) :
753 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
756 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
757 audit_log_task_context(audit_buf);
760 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
761 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
763 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
764 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
765 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
766 struct sk_buff *skb);
767 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
769 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
770 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
772 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
776 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
781 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
786 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
791 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
796 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
801 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
802 struct sk_buff *skb, __be32 net_seq)
806 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
811 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
812 __be32 net_spi, __be32 net_seq)
816 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
817 struct sk_buff *skb, u8 proto)
820 #endif /* CONFIG_AUDITSYSCALL */
822 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
824 if (likely(policy != NULL))
825 refcount_inc(&policy->refcnt);
828 void xfrm_policy_destroy(struct xfrm_policy *policy);
830 static inline void xfrm_pol_put(struct xfrm_policy *policy)
832 if (refcount_dec_and_test(&policy->refcnt))
833 xfrm_policy_destroy(policy);
836 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
839 for (i = npols - 1; i >= 0; --i)
840 xfrm_pol_put(pols[i]);
843 void __xfrm_state_destroy(struct xfrm_state *);
845 static inline void __xfrm_state_put(struct xfrm_state *x)
847 refcount_dec(&x->refcnt);
850 static inline void xfrm_state_put(struct xfrm_state *x)
852 if (refcount_dec_and_test(&x->refcnt))
853 __xfrm_state_destroy(x);
856 static inline void xfrm_state_hold(struct xfrm_state *x)
858 refcount_inc(&x->refcnt);
861 static inline bool addr_match(const void *token1, const void *token2,
862 unsigned int prefixlen)
864 const __be32 *a1 = token1;
865 const __be32 *a2 = token2;
869 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
870 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
873 if (memcmp(a1, a2, pdw << 2))
879 mask = htonl((0xffffffff) << (32 - pbi));
881 if ((a1[pdw] ^ a2[pdw]) & mask)
888 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
890 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
891 if (sizeof(long) == 4 && prefixlen == 0)
893 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
897 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
900 switch(fl->flowi_proto) {
903 case IPPROTO_UDPLITE:
905 port = uli->ports.sport;
909 port = htons(uli->icmpt.type);
912 port = htons(uli->mht.type);
915 port = htons(ntohl(uli->gre_key) >> 16);
924 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
927 switch(fl->flowi_proto) {
930 case IPPROTO_UDPLITE:
932 port = uli->ports.dport;
936 port = htons(uli->icmpt.code);
939 port = htons(ntohl(uli->gre_key) & 0xffff);
947 bool xfrm_selector_match(const struct xfrm_selector *sel,
948 const struct flowi *fl, unsigned short family);
950 #ifdef CONFIG_SECURITY_NETWORK_XFRM
951 /* If neither has a context --> match
952 * Otherwise, both must have a context and the sids, doi, alg must match
954 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
956 return ((!s1 && !s2) ||
958 (s1->ctx_sid == s2->ctx_sid) &&
959 (s1->ctx_doi == s2->ctx_doi) &&
960 (s1->ctx_alg == s2->ctx_alg)));
963 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
969 /* A struct encoding bundle of transformations to apply to some set of flow.
971 * dst->child points to the next element of bundle.
972 * dst->xfrm points to an instanse of transformer.
974 * Due to unfortunate limitations of current routing cache, which we
975 * have no time to fix, it mirrors struct rtable and bound to the same
976 * routing key, including saddr,daddr. However, we can have many of
977 * bundles differing by session id. All the bundles grow from a parent
982 struct dst_entry dst;
986 struct dst_entry *route;
987 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
988 int num_pols, num_xfrms;
991 u32 route_mtu_cached;
992 u32 child_mtu_cached;
997 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1007 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1009 xfrm_pols_put(xdst->pols, xdst->num_pols);
1010 dst_release(xdst->route);
1011 if (likely(xdst->u.dst.xfrm))
1012 xfrm_state_put(xdst->u.dst.xfrm);
1016 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1018 struct xfrm_offload {
1019 /* Output sequence number for replay protection on offloading. */
1026 #define SA_DELETE_REQ 1
1027 #define CRYPTO_DONE 2
1028 #define CRYPTO_NEXT_DONE 4
1029 #define CRYPTO_FALLBACK 8
1030 #define XFRM_GSO_SEGMENT 16
1032 #define XFRM_ESP_NO_TRAILER 64
1035 #define CRYPTO_SUCCESS 1
1036 #define CRYPTO_GENERIC_ERROR 2
1037 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1038 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1039 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1040 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1041 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1042 #define CRYPTO_INVALID_PROTOCOL 128
1052 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1053 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1056 static inline int secpath_exists(struct sk_buff *skb)
1059 return skb->sp != NULL;
1065 static inline struct sec_path *
1066 secpath_get(struct sec_path *sp)
1069 refcount_inc(&sp->refcnt);
1073 void __secpath_destroy(struct sec_path *sp);
1076 secpath_put(struct sec_path *sp)
1078 if (sp && refcount_dec_and_test(&sp->refcnt))
1079 __secpath_destroy(sp);
1082 struct sec_path *secpath_dup(struct sec_path *src);
1083 int secpath_set(struct sk_buff *skb);
1086 secpath_reset(struct sk_buff *skb)
1089 secpath_put(skb->sp);
1095 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1099 return addr->a4 == 0;
1101 return ipv6_addr_any(&addr->in6);
1107 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1109 return (tmpl->saddr.a4 &&
1110 tmpl->saddr.a4 != x->props.saddr.a4);
1114 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1116 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1117 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1121 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1125 return __xfrm4_state_addr_cmp(tmpl, x);
1127 return __xfrm6_state_addr_cmp(tmpl, x);
1133 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1134 unsigned short family);
1136 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1137 struct sk_buff *skb,
1138 unsigned int family, int reverse)
1140 struct net *net = dev_net(skb->dev);
1141 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1143 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1144 return __xfrm_policy_check(sk, ndir, skb, family);
1146 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1147 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1148 __xfrm_policy_check(sk, ndir, skb, family);
1151 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1153 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1156 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1158 return xfrm_policy_check(sk, dir, skb, AF_INET);
1161 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1163 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1166 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1167 struct sk_buff *skb)
1169 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1172 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1173 struct sk_buff *skb)
1175 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1178 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1179 unsigned int family, int reverse);
1181 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1182 unsigned int family)
1184 return __xfrm_decode_session(skb, fl, family, 0);
1187 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1189 unsigned int family)
1191 return __xfrm_decode_session(skb, fl, family, 1);
1194 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1196 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1198 struct net *net = dev_net(skb->dev);
1200 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1201 (skb_dst(skb)->flags & DST_NOXFRM) ||
1202 __xfrm_route_forward(skb, family);
1205 static inline int xfrm4_route_forward(struct sk_buff *skb)
1207 return xfrm_route_forward(skb, AF_INET);
1210 static inline int xfrm6_route_forward(struct sk_buff *skb)
1212 return xfrm_route_forward(skb, AF_INET6);
1215 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1217 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1219 sk->sk_policy[0] = NULL;
1220 sk->sk_policy[1] = NULL;
1221 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1222 return __xfrm_sk_clone_policy(sk, osk);
1226 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1228 static inline void xfrm_sk_free_policy(struct sock *sk)
1230 struct xfrm_policy *pol;
1232 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1233 if (unlikely(pol != NULL)) {
1234 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1235 sk->sk_policy[0] = NULL;
1237 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1238 if (unlikely(pol != NULL)) {
1239 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1240 sk->sk_policy[1] = NULL;
1246 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1247 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1248 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1249 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1250 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1254 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1258 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1262 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1264 unsigned int family)
1268 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1269 struct sk_buff *skb)
1273 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1274 struct sk_buff *skb)
1281 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1285 return (xfrm_address_t *)&fl->u.ip4.daddr;
1287 return (xfrm_address_t *)&fl->u.ip6.daddr;
1293 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1297 return (xfrm_address_t *)&fl->u.ip4.saddr;
1299 return (xfrm_address_t *)&fl->u.ip6.saddr;
1305 void xfrm_flowi_addr_get(const struct flowi *fl,
1306 xfrm_address_t *saddr, xfrm_address_t *daddr,
1307 unsigned short family)
1311 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1312 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1315 saddr->in6 = fl->u.ip6.saddr;
1316 daddr->in6 = fl->u.ip6.daddr;
1321 static __inline__ int
1322 __xfrm4_state_addr_check(const struct xfrm_state *x,
1323 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1325 if (daddr->a4 == x->id.daddr.a4 &&
1326 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1331 static __inline__ int
1332 __xfrm6_state_addr_check(const struct xfrm_state *x,
1333 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1335 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1336 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1337 ipv6_addr_any((struct in6_addr *)saddr) ||
1338 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1343 static __inline__ int
1344 xfrm_state_addr_check(const struct xfrm_state *x,
1345 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1346 unsigned short family)
1350 return __xfrm4_state_addr_check(x, daddr, saddr);
1352 return __xfrm6_state_addr_check(x, daddr, saddr);
1357 static __inline__ int
1358 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1359 unsigned short family)
1363 return __xfrm4_state_addr_check(x,
1364 (const xfrm_address_t *)&fl->u.ip4.daddr,
1365 (const xfrm_address_t *)&fl->u.ip4.saddr);
1367 return __xfrm6_state_addr_check(x,
1368 (const xfrm_address_t *)&fl->u.ip6.daddr,
1369 (const xfrm_address_t *)&fl->u.ip6.saddr);
1374 static inline int xfrm_state_kern(const struct xfrm_state *x)
1376 return atomic_read(&x->tunnel_users);
1379 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1381 return (!userproto || proto == userproto ||
1382 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1383 proto == IPPROTO_ESP ||
1384 proto == IPPROTO_COMP)));
1388 * xfrm algorithm information
1390 struct xfrm_algo_aead_info {
1395 struct xfrm_algo_auth_info {
1400 struct xfrm_algo_encr_info {
1406 struct xfrm_algo_comp_info {
1410 struct xfrm_algo_desc {
1414 u8 pfkey_supported:1;
1416 struct xfrm_algo_aead_info aead;
1417 struct xfrm_algo_auth_info auth;
1418 struct xfrm_algo_encr_info encr;
1419 struct xfrm_algo_comp_info comp;
1421 struct sadb_alg desc;
1424 /* XFRM protocol handlers. */
1425 struct xfrm4_protocol {
1426 int (*handler)(struct sk_buff *skb);
1427 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1429 int (*cb_handler)(struct sk_buff *skb, int err);
1430 int (*err_handler)(struct sk_buff *skb, u32 info);
1432 struct xfrm4_protocol __rcu *next;
1436 struct xfrm6_protocol {
1437 int (*handler)(struct sk_buff *skb);
1438 int (*cb_handler)(struct sk_buff *skb, int err);
1439 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1440 u8 type, u8 code, int offset, __be32 info);
1442 struct xfrm6_protocol __rcu *next;
1446 /* XFRM tunnel handlers. */
1447 struct xfrm_tunnel {
1448 int (*handler)(struct sk_buff *skb);
1449 int (*err_handler)(struct sk_buff *skb, u32 info);
1451 struct xfrm_tunnel __rcu *next;
1455 struct xfrm6_tunnel {
1456 int (*handler)(struct sk_buff *skb);
1457 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1458 u8 type, u8 code, int offset, __be32 info);
1459 struct xfrm6_tunnel __rcu *next;
1463 void xfrm_init(void);
1464 void xfrm4_init(void);
1465 int xfrm_state_init(struct net *net);
1466 void xfrm_state_fini(struct net *net);
1467 void xfrm4_state_init(void);
1468 void xfrm4_protocol_init(void);
1470 int xfrm6_init(void);
1471 void xfrm6_fini(void);
1472 int xfrm6_state_init(void);
1473 void xfrm6_state_fini(void);
1474 int xfrm6_protocol_init(void);
1475 void xfrm6_protocol_fini(void);
1477 static inline int xfrm6_init(void)
1481 static inline void xfrm6_fini(void)
1487 #ifdef CONFIG_XFRM_STATISTICS
1488 int xfrm_proc_init(struct net *net);
1489 void xfrm_proc_fini(struct net *net);
1492 int xfrm_sysctl_init(struct net *net);
1493 #ifdef CONFIG_SYSCTL
1494 void xfrm_sysctl_fini(struct net *net);
1496 static inline void xfrm_sysctl_fini(struct net *net)
1501 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1502 struct xfrm_address_filter *filter);
1503 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1504 int (*func)(struct xfrm_state *, int, void*), void *);
1505 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1506 struct xfrm_state *xfrm_state_alloc(struct net *net);
1507 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1508 const xfrm_address_t *saddr,
1509 const struct flowi *fl,
1510 struct xfrm_tmpl *tmpl,
1511 struct xfrm_policy *pol, int *err,
1512 unsigned short family);
1513 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1514 xfrm_address_t *daddr,
1515 xfrm_address_t *saddr,
1516 unsigned short family,
1517 u8 mode, u8 proto, u32 reqid);
1518 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1519 unsigned short family);
1520 int xfrm_state_check_expire(struct xfrm_state *x);
1521 void xfrm_state_insert(struct xfrm_state *x);
1522 int xfrm_state_add(struct xfrm_state *x);
1523 int xfrm_state_update(struct xfrm_state *x);
1524 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1525 const xfrm_address_t *daddr, __be32 spi,
1526 u8 proto, unsigned short family);
1527 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1528 const xfrm_address_t *daddr,
1529 const xfrm_address_t *saddr,
1531 unsigned short family);
1532 #ifdef CONFIG_XFRM_SUB_POLICY
1533 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1534 unsigned short family, struct net *net);
1535 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1536 unsigned short family);
1538 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1539 int n, unsigned short family, struct net *net)
1544 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1545 int n, unsigned short family)
1551 struct xfrmk_sadinfo {
1552 u32 sadhcnt; /* current hash bkts */
1553 u32 sadhmcnt; /* max allowed hash bkts */
1554 u32 sadcnt; /* current running count */
1557 struct xfrmk_spdinfo {
1568 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1569 int xfrm_state_delete(struct xfrm_state *x);
1570 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1571 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1572 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1573 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1574 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1575 int xfrm_init_replay(struct xfrm_state *x);
1576 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1577 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1578 int xfrm_init_state(struct xfrm_state *x);
1579 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1580 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1581 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1582 int xfrm_output_resume(struct sk_buff *skb, int err);
1583 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1584 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1585 void xfrm_local_error(struct sk_buff *skb, int mtu);
1586 int xfrm4_extract_header(struct sk_buff *skb);
1587 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1588 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1590 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1591 int xfrm4_rcv(struct sk_buff *skb);
1592 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1594 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1596 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1597 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1598 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1599 return xfrm_input(skb, nexthdr, spi, 0);
1602 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1603 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1604 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1605 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1606 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1607 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1608 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1609 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1610 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1611 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1612 int xfrm6_extract_header(struct sk_buff *skb);
1613 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1614 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1616 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1617 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1618 int xfrm6_rcv(struct sk_buff *skb);
1619 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1620 xfrm_address_t *saddr, u8 proto);
1621 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1622 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1623 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1624 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1625 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1626 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1627 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1628 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1629 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1630 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1631 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1632 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1633 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1637 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1638 int xfrm_user_policy(struct sock *sk, int optname,
1639 u8 __user *optval, int optlen);
1641 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1643 return -ENOPROTOOPT;
1646 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1648 /* should not happen */
1654 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1655 const xfrm_address_t *saddr,
1656 const xfrm_address_t *daddr,
1657 int family, u32 mark);
1659 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1661 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1662 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1663 int (*func)(struct xfrm_policy *, int, int, void*),
1665 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1666 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1667 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1669 struct xfrm_selector *sel,
1670 struct xfrm_sec_ctx *ctx, int delete,
1672 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1673 u32 id, int delete, int *err);
1674 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1675 void xfrm_policy_hash_rebuild(struct net *net);
1676 u32 xfrm_get_acqseq(void);
1677 int verify_spi_info(u8 proto, u32 min, u32 max);
1678 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1679 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1680 u8 mode, u32 reqid, u8 proto,
1681 const xfrm_address_t *daddr,
1682 const xfrm_address_t *saddr, int create,
1683 unsigned short family);
1684 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1686 #ifdef CONFIG_XFRM_MIGRATE
1687 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1688 const struct xfrm_migrate *m, int num_bundles,
1689 const struct xfrm_kmaddress *k,
1690 const struct xfrm_encap_tmpl *encap);
1691 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1692 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1693 struct xfrm_migrate *m,
1694 struct xfrm_encap_tmpl *encap);
1695 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1696 struct xfrm_migrate *m, int num_bundles,
1697 struct xfrm_kmaddress *k, struct net *net,
1698 struct xfrm_encap_tmpl *encap);
1701 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1702 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1703 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1704 xfrm_address_t *addr);
1706 void xfrm_input_init(void);
1707 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1709 void xfrm_probe_algs(void);
1710 int xfrm_count_pfkey_auth_supported(void);
1711 int xfrm_count_pfkey_enc_supported(void);
1712 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1713 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1714 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1715 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1716 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1717 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1718 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1719 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1720 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1723 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1724 const xfrm_address_t *b)
1726 return ipv6_addr_equal((const struct in6_addr *)a,
1727 (const struct in6_addr *)b);
1730 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1731 const xfrm_address_t *b,
1737 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1739 return xfrm6_addr_equal(a, b);
1743 static inline int xfrm_policy_id2dir(u32 index)
1749 static inline int xfrm_aevent_is_on(struct net *net)
1755 nlsk = rcu_dereference(net->xfrm.nlsk);
1757 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1762 static inline int xfrm_acquire_is_on(struct net *net)
1768 nlsk = rcu_dereference(net->xfrm.nlsk);
1770 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1777 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1779 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1782 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1784 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1787 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1789 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1792 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1794 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1797 #ifdef CONFIG_XFRM_MIGRATE
1798 static inline int xfrm_replay_clone(struct xfrm_state *x,
1799 struct xfrm_state *orig)
1801 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1806 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1807 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1809 x->preplay_esn = kmemdup(x->replay_esn,
1810 xfrm_replay_state_esn_len(x->replay_esn),
1812 if (!x->preplay_esn) {
1813 kfree(x->replay_esn);
1820 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1822 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1826 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1828 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1831 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1833 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1836 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1839 for (i = 0; i < n; i++)
1840 xfrm_state_put(*(states + i));
1843 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1846 for (i = 0; i < n; i++)
1847 xfrm_state_delete(*(states + i));
1852 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1854 return skb->sp->xvec[skb->sp->len - 1];
1856 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1858 struct sec_path *sp = skb->sp;
1860 if (!sp || !sp->olen || sp->len != sp->olen)
1863 return &sp->ovec[sp->olen - 1];
1867 void __net_init xfrm_dev_init(void);
1869 #ifdef CONFIG_XFRM_OFFLOAD
1870 int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features);
1871 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1872 struct xfrm_user_offload *xuo);
1873 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1875 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1877 struct xfrm_state *x = dst->xfrm;
1879 if (!x || !x->type_offload)
1882 if (x->xso.offload_handle && (x->xso.dev == dst->path->dev) &&
1889 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1891 struct xfrm_state_offload *xso = &x->xso;
1894 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1897 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1899 struct xfrm_state_offload *xso = &x->xso;
1900 struct net_device *dev = xso->dev;
1902 if (dev && dev->xfrmdev_ops) {
1903 dev->xfrmdev_ops->xdo_dev_state_free(x);
1909 static inline int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features)
1914 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1919 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1923 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1927 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1932 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1938 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1940 if (attrs[XFRMA_MARK])
1941 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1948 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1953 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1957 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1958 unsigned int family)
1960 bool tunnel = false;
1964 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1968 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1972 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1977 #endif /* _NET_XFRM_H */