4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
19 #include <net/route.h>
21 #include <net/ip6_fib.h>
22 #ifdef CONFIG_XFRM_STATISTICS
26 #define XFRM_PROTO_ESP 50
27 #define XFRM_PROTO_AH 51
28 #define XFRM_PROTO_COMP 108
29 #define XFRM_PROTO_IPIP 4
30 #define XFRM_PROTO_IPV6 41
31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
40 #ifdef CONFIG_XFRM_STATISTICS
41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
46 #define XFRM_INC_STATS(field)
47 #define XFRM_INC_STATS_BH(field)
48 #define XFRM_INC_STATS_USER(field)
51 extern struct sock *xfrm_nl;
52 extern u32 sysctl_xfrm_aevent_etime;
53 extern u32 sysctl_xfrm_aevent_rseqth;
54 extern int sysctl_xfrm_larval_drop;
55 extern u32 sysctl_xfrm_acq_expires;
57 extern struct mutex xfrm_cfg_mutex;
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
73 Lookup is plain linear search until the first match with selector.
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 Bundles are cached at xrfm_policy struct (field ->bundles).
90 Resolution of xrfm_tmpl
91 -----------------------
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 /* Full description of state of transformer. */
123 /* Note: bydst is re-used during gc */
124 struct hlist_node bydst;
125 struct hlist_node bysrc;
126 struct hlist_node byspi;
132 struct xfrm_selector sel;
136 /* Key manger bits */
143 /* Parameters of this state. */
148 u8 aalgo, ealgo, calgo;
151 xfrm_address_t saddr;
156 struct xfrm_lifetime_cfg lft;
158 /* Data for transformer */
159 struct xfrm_algo *aalg;
160 struct xfrm_algo *ealg;
161 struct xfrm_algo *calg;
162 struct xfrm_algo_aead *aead;
164 /* Data for encapsulator */
165 struct xfrm_encap_tmpl *encap;
167 /* Data for care-of address */
168 xfrm_address_t *coaddr;
170 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
171 struct xfrm_state *tunnel;
173 /* If a tunnel, number of users + 1 */
174 atomic_t tunnel_users;
176 /* State for replay detection */
177 struct xfrm_replay_state replay;
179 /* Replay detection state at the time we sent the last notification */
180 struct xfrm_replay_state preplay;
182 /* internal flag that only holds state for delayed aevent at the
187 /* Replay detection notification settings */
191 /* Replay detection notification timer */
192 struct timer_list rtimer;
195 struct xfrm_stats stats;
197 struct xfrm_lifetime_cur curlft;
198 struct timer_list timer;
201 unsigned long lastused;
203 /* Reference to data common to all the instances of this
205 const struct xfrm_type *type;
206 struct xfrm_mode *inner_mode;
207 struct xfrm_mode *inner_mode_iaf;
208 struct xfrm_mode *outer_mode;
210 /* Security context */
211 struct xfrm_sec_ctx *security;
213 /* Private data of this transformer, format is opaque,
214 * interpreted by xfrm_type methods. */
218 /* xflags - make enum if more show up */
219 #define XFRM_TIME_DEFER 1
230 /* callback structure passed from either netlink or pfkey */
249 struct xfrm_policy_afinfo {
250 unsigned short family;
251 struct dst_ops *dst_ops;
252 void (*garbage_collect)(void);
253 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
254 xfrm_address_t *daddr);
255 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
256 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
257 void (*decode_session)(struct sk_buff *skb,
260 int (*get_tos)(struct flowi *fl);
261 int (*init_path)(struct xfrm_dst *path,
262 struct dst_entry *dst,
264 int (*fill_dst)(struct xfrm_dst *xdst,
265 struct net_device *dev);
268 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
269 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
270 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
271 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
274 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
275 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
276 extern int __xfrm_state_delete(struct xfrm_state *x);
278 struct xfrm_state_afinfo {
282 struct module *owner;
283 const struct xfrm_type *type_map[IPPROTO_MAX];
284 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
285 int (*init_flags)(struct xfrm_state *x);
286 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
287 struct xfrm_tmpl *tmpl,
288 xfrm_address_t *daddr, xfrm_address_t *saddr);
289 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
290 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
291 int (*output)(struct sk_buff *skb);
292 int (*extract_input)(struct xfrm_state *x,
293 struct sk_buff *skb);
294 int (*extract_output)(struct xfrm_state *x,
295 struct sk_buff *skb);
296 int (*transport_finish)(struct sk_buff *skb,
300 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
301 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
303 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
308 struct module *owner;
311 #define XFRM_TYPE_NON_FRAGMENT 1
312 #define XFRM_TYPE_REPLAY_PROT 2
313 #define XFRM_TYPE_LOCAL_COADDR 4
314 #define XFRM_TYPE_REMOTE_COADDR 8
316 int (*init_state)(struct xfrm_state *x);
317 void (*destructor)(struct xfrm_state *);
318 int (*input)(struct xfrm_state *, struct sk_buff *skb);
319 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
320 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
321 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
322 /* Estimate maximal size of result of transformation of a dgram */
323 u32 (*get_mtu)(struct xfrm_state *, int size);
326 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
327 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
331 * Remove encapsulation header.
333 * The IP header will be moved over the top of the encapsulation
336 * On entry, the transport header shall point to where the IP header
337 * should be and the network header shall be set to where the IP
338 * header currently is. skb->data shall point to the start of the
341 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
344 * This is the actual input entry point.
346 * For transport mode and equivalent this would be identical to
347 * input2 (which does not need to be set). While tunnel mode
348 * and equivalent would set this to the tunnel encapsulation function
349 * xfrm4_prepare_input that would in turn call input2.
351 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
354 * Add encapsulation header.
356 * On exit, the transport header will be set to the start of the
357 * encapsulation header to be filled in by x->type->output and
358 * the mac header will be set to the nextheader (protocol for
359 * IPv4) field of the extension header directly preceding the
360 * encapsulation header, or in its absence, that of the top IP
361 * header. The value of the network header will always point
362 * to the top IP header while skb->data will point to the payload.
364 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
367 * This is the actual output entry point.
369 * For transport mode and equivalent this would be identical to
370 * output2 (which does not need to be set). While tunnel mode
371 * and equivalent would set this to a tunnel encapsulation function
372 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
375 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
377 struct xfrm_state_afinfo *afinfo;
378 struct module *owner;
383 /* Flags for xfrm_mode. */
385 XFRM_MODE_FLAG_TUNNEL = 1,
388 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
389 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
391 static inline int xfrm_af2proto(unsigned int family)
403 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
405 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
406 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
407 return x->inner_mode;
409 return x->inner_mode_iaf;
414 /* id in template is interpreted as:
415 * daddr - destination of tunnel, may be zero for transport mode.
416 * spi - zero to acquire spi. Not zero if spi is static, then
417 * daddr must be fixed too.
418 * proto - AH/ESP/IPCOMP
422 /* Source address of tunnel. Ignored, if it is not a tunnel. */
423 xfrm_address_t saddr;
425 unsigned short encap_family;
429 /* Mode: transport, tunnel etc. */
432 /* Sharing mode: unique, this session only, this user only etc. */
435 /* May skip this transfomration if no SA is found */
438 /* Bit mask of algos allowed for acquisition */
444 #define XFRM_MAX_DEPTH 6
448 struct xfrm_policy *next;
449 struct hlist_node bydst;
450 struct hlist_node byidx;
452 /* This lock only affects elements except for entry. */
455 struct timer_list timer;
459 struct xfrm_selector selector;
460 struct xfrm_lifetime_cfg lft;
461 struct xfrm_lifetime_cur curlft;
462 struct dst_entry *bundles;
469 /* XXX 1 byte hole, try to pack */
470 struct xfrm_sec_ctx *security;
471 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
474 struct xfrm_migrate {
475 xfrm_address_t old_daddr;
476 xfrm_address_t old_saddr;
477 xfrm_address_t new_daddr;
478 xfrm_address_t new_saddr;
487 #define XFRM_KM_TIMEOUT 30
489 #define XFRM_REPLAY_SEQ 1
490 #define XFRM_REPLAY_OSEQ 2
491 #define XFRM_REPLAY_SEQ_MASK 3
493 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
494 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
496 /* default aevent timeout in units of 100ms */
497 #define XFRM_AE_ETIME 10
498 /* Async Event timer multiplier */
499 #define XFRM_AE_ETH_M 10
500 /* default seq threshold size */
501 #define XFRM_AE_SEQT_SIZE 2
505 struct list_head list;
507 int (*notify)(struct xfrm_state *x, struct km_event *c);
508 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
509 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
510 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
511 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
512 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
513 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
516 extern int xfrm_register_km(struct xfrm_mgr *km);
517 extern int xfrm_unregister_km(struct xfrm_mgr *km);
519 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
522 * This structure is used for the duration where packets are being
523 * transformed by IPsec. As soon as the packet leaves IPsec the
524 * area beyond the generic IP part may be overwritten.
528 struct inet_skb_parm h4;
529 struct inet6_skb_parm h6;
532 /* Sequence number for replay protection. */
539 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
542 * This structure is used by the afinfo prepare_input/prepare_output functions
543 * to transmit header information to the mode input/output functions.
545 struct xfrm_mode_skb_cb {
547 struct inet_skb_parm h4;
548 struct inet6_skb_parm h6;
551 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
555 /* IP header length (excluding options or extension headers). */
558 /* TOS for IPv4, class for IPv6. */
561 /* TTL for IPv4, hop limitfor IPv6. */
564 /* Protocol for IPv4, NH for IPv6. */
567 /* Option length for IPv4, zero for IPv6. */
570 /* Used by IPv6 only, zero for IPv4. */
574 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
577 * This structure is used by the input processing to locate the SPI and
578 * related information.
580 struct xfrm_spi_skb_cb {
582 struct inet_skb_parm h4;
583 struct inet6_skb_parm h6;
586 unsigned int daddroff;
590 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
592 /* Audit Information */
599 #ifdef CONFIG_AUDITSYSCALL
600 static inline struct audit_buffer *xfrm_audit_start(const char *op)
602 struct audit_buffer *audit_buf = NULL;
604 if (audit_enabled == 0)
606 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
607 AUDIT_MAC_IPSEC_EVENT);
608 if (audit_buf == NULL)
610 audit_log_format(audit_buf, "op=%s", op);
614 static inline void xfrm_audit_helper_usrinfo(u32 auid, u32 secid,
615 struct audit_buffer *audit_buf)
620 audit_log_format(audit_buf, " auid=%u", auid);
622 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
623 audit_log_format(audit_buf, " subj=%s", secctx);
624 security_release_secctx(secctx, secctx_len);
626 audit_log_task_context(audit_buf);
629 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
630 u32 auid, u32 secid);
631 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
632 u32 auid, u32 secid);
633 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
634 u32 auid, u32 secid);
635 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
636 u32 auid, u32 secid);
637 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
638 struct sk_buff *skb);
639 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
640 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
641 __be32 net_spi, __be32 net_seq);
642 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
643 struct sk_buff *skb, u8 proto);
645 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
646 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
647 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
648 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
649 #define xfrm_audit_state_replay_overflow(x, s) do { ; } while (0)
650 #define xfrm_audit_state_notfound_simple(s, f) do { ; } while (0)
651 #define xfrm_audit_state_notfound(s, f, sp, sq) do { ; } while (0)
652 #define xfrm_audit_state_icvfail(x, s, p) do { ; } while (0)
653 #endif /* CONFIG_AUDITSYSCALL */
655 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
657 if (likely(policy != NULL))
658 atomic_inc(&policy->refcnt);
661 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
663 static inline void xfrm_pol_put(struct xfrm_policy *policy)
665 if (atomic_dec_and_test(&policy->refcnt))
666 xfrm_policy_destroy(policy);
669 #ifdef CONFIG_XFRM_SUB_POLICY
670 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
673 for (i = npols - 1; i >= 0; --i)
674 xfrm_pol_put(pols[i]);
677 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
679 xfrm_pol_put(pols[0]);
683 extern void __xfrm_state_destroy(struct xfrm_state *);
685 static inline void __xfrm_state_put(struct xfrm_state *x)
687 atomic_dec(&x->refcnt);
690 static inline void xfrm_state_put(struct xfrm_state *x)
692 if (atomic_dec_and_test(&x->refcnt))
693 __xfrm_state_destroy(x);
696 static inline void xfrm_state_hold(struct xfrm_state *x)
698 atomic_inc(&x->refcnt);
701 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
708 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
709 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
712 if (memcmp(a1, a2, pdw << 2))
718 mask = htonl((0xffffffff) << (32 - pbi));
720 if ((a1[pdw] ^ a2[pdw]) & mask)
728 __be16 xfrm_flowi_sport(struct flowi *fl)
734 case IPPROTO_UDPLITE:
736 port = fl->fl_ip_sport;
740 port = htons(fl->fl_icmp_type);
743 port = htons(fl->fl_mh_type);
752 __be16 xfrm_flowi_dport(struct flowi *fl)
758 case IPPROTO_UDPLITE:
760 port = fl->fl_ip_dport;
764 port = htons(fl->fl_icmp_code);
772 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
773 unsigned short family);
775 #ifdef CONFIG_SECURITY_NETWORK_XFRM
776 /* If neither has a context --> match
777 * Otherwise, both must have a context and the sids, doi, alg must match
779 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
781 return ((!s1 && !s2) ||
783 (s1->ctx_sid == s2->ctx_sid) &&
784 (s1->ctx_doi == s2->ctx_doi) &&
785 (s1->ctx_alg == s2->ctx_alg)));
788 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
794 /* A struct encoding bundle of transformations to apply to some set of flow.
796 * dst->child points to the next element of bundle.
797 * dst->xfrm points to an instanse of transformer.
799 * Due to unfortunate limitations of current routing cache, which we
800 * have no time to fix, it mirrors struct rtable and bound to the same
801 * routing key, including saddr,daddr. However, we can have many of
802 * bundles differing by session id. All the bundles grow from a parent
808 struct dst_entry dst;
812 struct dst_entry *route;
813 #ifdef CONFIG_XFRM_SUB_POLICY
814 struct flowi *origin;
815 struct xfrm_selector *partner;
818 u32 route_mtu_cached;
819 u32 child_mtu_cached;
824 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
826 dst_release(xdst->route);
827 if (likely(xdst->u.dst.xfrm))
828 xfrm_state_put(xdst->u.dst.xfrm);
829 #ifdef CONFIG_XFRM_SUB_POLICY
832 kfree(xdst->partner);
833 xdst->partner = NULL;
837 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
843 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
846 static inline struct sec_path *
847 secpath_get(struct sec_path *sp)
850 atomic_inc(&sp->refcnt);
854 extern void __secpath_destroy(struct sec_path *sp);
857 secpath_put(struct sec_path *sp)
859 if (sp && atomic_dec_and_test(&sp->refcnt))
860 __secpath_destroy(sp);
863 extern struct sec_path *secpath_dup(struct sec_path *src);
866 secpath_reset(struct sk_buff *skb)
869 secpath_put(skb->sp);
875 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
879 return addr->a4 == 0;
881 return ipv6_addr_any((struct in6_addr *)&addr->a6);
887 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
889 return (tmpl->saddr.a4 &&
890 tmpl->saddr.a4 != x->props.saddr.a4);
894 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
896 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
897 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
901 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
905 return __xfrm4_state_addr_cmp(tmpl, x);
907 return __xfrm6_state_addr_cmp(tmpl, x);
913 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
915 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
917 unsigned int family, int reverse)
919 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
921 if (sk && sk->sk_policy[XFRM_POLICY_IN])
922 return __xfrm_policy_check(sk, ndir, skb, family);
924 return (!xfrm_policy_count[dir] && !skb->sp) ||
925 (skb->dst->flags & DST_NOPOLICY) ||
926 __xfrm_policy_check(sk, ndir, skb, family);
929 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
931 return __xfrm_policy_check2(sk, dir, skb, family, 0);
934 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
936 return xfrm_policy_check(sk, dir, skb, AF_INET);
939 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
941 return xfrm_policy_check(sk, dir, skb, AF_INET6);
944 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
947 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
950 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
953 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
956 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
957 unsigned int family, int reverse);
959 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
962 return __xfrm_decode_session(skb, fl, family, 0);
965 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
969 return __xfrm_decode_session(skb, fl, family, 1);
972 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
974 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
976 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
977 (skb->dst->flags & DST_NOXFRM) ||
978 __xfrm_route_forward(skb, family);
981 static inline int xfrm4_route_forward(struct sk_buff *skb)
983 return xfrm_route_forward(skb, AF_INET);
986 static inline int xfrm6_route_forward(struct sk_buff *skb)
988 return xfrm_route_forward(skb, AF_INET6);
991 extern int __xfrm_sk_clone_policy(struct sock *sk);
993 static inline int xfrm_sk_clone_policy(struct sock *sk)
995 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
996 return __xfrm_sk_clone_policy(sk);
1000 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1002 static inline void xfrm_sk_free_policy(struct sock *sk)
1004 if (unlikely(sk->sk_policy[0] != NULL)) {
1005 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1006 sk->sk_policy[0] = NULL;
1008 if (unlikely(sk->sk_policy[1] != NULL)) {
1009 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1010 sk->sk_policy[1] = NULL;
1016 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1017 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1018 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1019 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1020 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1024 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1028 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1032 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1034 unsigned int family)
1038 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1039 struct sk_buff *skb)
1043 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1044 struct sk_buff *skb)
1051 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1055 return (xfrm_address_t *)&fl->fl4_dst;
1057 return (xfrm_address_t *)&fl->fl6_dst;
1063 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1067 return (xfrm_address_t *)&fl->fl4_src;
1069 return (xfrm_address_t *)&fl->fl6_src;
1074 static __inline__ int
1075 __xfrm4_state_addr_check(struct xfrm_state *x,
1076 xfrm_address_t *daddr, xfrm_address_t *saddr)
1078 if (daddr->a4 == x->id.daddr.a4 &&
1079 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1084 static __inline__ int
1085 __xfrm6_state_addr_check(struct xfrm_state *x,
1086 xfrm_address_t *daddr, xfrm_address_t *saddr)
1088 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1089 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1090 ipv6_addr_any((struct in6_addr *)saddr) ||
1091 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1096 static __inline__ int
1097 xfrm_state_addr_check(struct xfrm_state *x,
1098 xfrm_address_t *daddr, xfrm_address_t *saddr,
1099 unsigned short family)
1103 return __xfrm4_state_addr_check(x, daddr, saddr);
1105 return __xfrm6_state_addr_check(x, daddr, saddr);
1110 static __inline__ int
1111 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1112 unsigned short family)
1116 return __xfrm4_state_addr_check(x,
1117 (xfrm_address_t *)&fl->fl4_dst,
1118 (xfrm_address_t *)&fl->fl4_src);
1120 return __xfrm6_state_addr_check(x,
1121 (xfrm_address_t *)&fl->fl6_dst,
1122 (xfrm_address_t *)&fl->fl6_src);
1127 static inline int xfrm_state_kern(struct xfrm_state *x)
1129 return atomic_read(&x->tunnel_users);
1132 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1134 return (!userproto || proto == userproto ||
1135 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1136 proto == IPPROTO_ESP ||
1137 proto == IPPROTO_COMP)));
1141 * xfrm algorithm information
1143 struct xfrm_algo_aead_info {
1147 struct xfrm_algo_auth_info {
1152 struct xfrm_algo_encr_info {
1157 struct xfrm_algo_comp_info {
1161 struct xfrm_algo_desc {
1166 struct xfrm_algo_aead_info aead;
1167 struct xfrm_algo_auth_info auth;
1168 struct xfrm_algo_encr_info encr;
1169 struct xfrm_algo_comp_info comp;
1171 struct sadb_alg desc;
1174 /* XFRM tunnel handlers. */
1175 struct xfrm_tunnel {
1176 int (*handler)(struct sk_buff *skb);
1177 int (*err_handler)(struct sk_buff *skb, __u32 info);
1179 struct xfrm_tunnel *next;
1183 struct xfrm6_tunnel {
1184 int (*handler)(struct sk_buff *skb);
1185 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1186 int type, int code, int offset, __be32 info);
1187 struct xfrm6_tunnel *next;
1191 extern void xfrm_init(void);
1192 extern void xfrm4_init(void);
1193 extern void xfrm_state_init(void);
1194 extern void xfrm4_state_init(void);
1196 extern int xfrm6_init(void);
1197 extern void xfrm6_fini(void);
1198 extern int xfrm6_state_init(void);
1199 extern void xfrm6_state_fini(void);
1201 static inline int xfrm6_init(void)
1205 static inline void xfrm6_fini(void)
1211 #ifdef CONFIG_XFRM_STATISTICS
1212 extern int xfrm_proc_init(void);
1215 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
1216 extern struct xfrm_state *xfrm_state_alloc(void);
1217 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1218 struct flowi *fl, struct xfrm_tmpl *tmpl,
1219 struct xfrm_policy *pol, int *err,
1220 unsigned short family);
1221 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1222 xfrm_address_t *saddr,
1223 unsigned short family,
1224 u8 mode, u8 proto, u32 reqid);
1225 extern int xfrm_state_check_expire(struct xfrm_state *x);
1226 extern void xfrm_state_insert(struct xfrm_state *x);
1227 extern int xfrm_state_add(struct xfrm_state *x);
1228 extern int xfrm_state_update(struct xfrm_state *x);
1229 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1230 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1231 #ifdef CONFIG_XFRM_SUB_POLICY
1232 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1233 int n, unsigned short family);
1234 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1235 int n, unsigned short family);
1237 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1238 int n, unsigned short family)
1243 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1244 int n, unsigned short family)
1250 struct xfrmk_sadinfo {
1251 u32 sadhcnt; /* current hash bkts */
1252 u32 sadhmcnt; /* max allowed hash bkts */
1253 u32 sadcnt; /* current running count */
1256 struct xfrmk_spdinfo {
1267 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1268 extern int xfrm_state_delete(struct xfrm_state *x);
1269 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1270 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1271 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1272 extern int xfrm_replay_check(struct xfrm_state *x,
1273 struct sk_buff *skb, __be32 seq);
1274 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1275 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1276 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1277 extern int xfrm_init_state(struct xfrm_state *x);
1278 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1279 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1281 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1282 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1283 extern int xfrm_output(struct sk_buff *skb);
1284 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1285 extern int xfrm4_extract_header(struct sk_buff *skb);
1286 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1287 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1289 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1290 extern int xfrm4_rcv(struct sk_buff *skb);
1292 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1294 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1297 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1298 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1299 extern int xfrm4_output(struct sk_buff *skb);
1300 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1301 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1302 extern int xfrm6_extract_header(struct sk_buff *skb);
1303 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1304 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1305 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1306 extern int xfrm6_rcv(struct sk_buff *skb);
1307 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1308 xfrm_address_t *saddr, u8 proto);
1309 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1310 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1311 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1312 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1313 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1314 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1315 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1316 extern int xfrm6_output(struct sk_buff *skb);
1317 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1321 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1322 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1324 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1326 return -ENOPROTOOPT;
1329 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1331 /* should not happen */
1337 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1338 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1339 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1340 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1341 struct xfrm_selector *sel,
1342 struct xfrm_sec_ctx *ctx, int delete,
1344 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1345 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1346 u32 xfrm_get_acqseq(void);
1347 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1348 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1349 xfrm_address_t *daddr, xfrm_address_t *saddr,
1350 int create, unsigned short family);
1351 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1352 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1353 struct flowi *fl, int family, int strict);
1355 #ifdef CONFIG_XFRM_MIGRATE
1356 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1357 struct xfrm_migrate *m, int num_bundles);
1358 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1359 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1360 struct xfrm_migrate *m);
1361 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1362 struct xfrm_migrate *m, int num_bundles);
1365 extern wait_queue_head_t km_waitq;
1366 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1367 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1368 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1370 extern void xfrm_input_init(void);
1371 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1373 extern void xfrm_probe_algs(void);
1374 extern int xfrm_count_auth_supported(void);
1375 extern int xfrm_count_enc_supported(void);
1376 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1377 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1378 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1379 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1380 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1381 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1382 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1383 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1384 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1389 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1392 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1393 int offset, int len, icv_update_fn_t icv_update);
1395 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1401 return (__force __u32)a->a4 - (__force __u32)b->a4;
1403 return ipv6_addr_cmp((struct in6_addr *)a,
1404 (struct in6_addr *)b);
1408 static inline int xfrm_policy_id2dir(u32 index)
1413 static inline int xfrm_aevent_is_on(void)
1419 nlsk = rcu_dereference(xfrm_nl);
1421 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1426 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1428 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1431 #ifdef CONFIG_XFRM_MIGRATE
1432 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1434 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1437 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1440 for (i = 0; i < n; i++)
1441 xfrm_state_put(*(states + i));
1444 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1447 for (i = 0; i < n; i++)
1448 xfrm_state_delete(*(states + i));
1452 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1454 return skb->sp->xvec[skb->sp->len - 1];
1457 #endif /* _NET_XFRM_H */