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 /* TOS for IPv4, class for IPv6. */
558 /* TTL for IPv4, hop limitfor IPv6. */
561 /* Protocol for IPv4, NH for IPv6. */
564 /* Used by IPv6 only, zero for IPv4. */
568 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
571 * This structure is used by the input processing to locate the SPI and
572 * related information.
574 struct xfrm_spi_skb_cb {
576 struct inet_skb_parm h4;
577 struct inet6_skb_parm h6;
580 unsigned int daddroff;
584 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
586 /* Audit Information */
593 #ifdef CONFIG_AUDITSYSCALL
594 static inline struct audit_buffer *xfrm_audit_start(const char *op)
596 struct audit_buffer *audit_buf = NULL;
598 if (audit_enabled == 0)
600 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
601 AUDIT_MAC_IPSEC_EVENT);
602 if (audit_buf == NULL)
604 audit_log_format(audit_buf, "op=%s", op);
608 static inline void xfrm_audit_helper_usrinfo(u32 auid, u32 secid,
609 struct audit_buffer *audit_buf)
614 audit_log_format(audit_buf, " auid=%u", auid);
616 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
617 audit_log_format(audit_buf, " subj=%s", secctx);
618 security_release_secctx(secctx, secctx_len);
620 audit_log_task_context(audit_buf);
623 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
624 u32 auid, u32 secid);
625 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
626 u32 auid, u32 secid);
627 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
628 u32 auid, u32 secid);
629 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
630 u32 auid, u32 secid);
631 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
632 struct sk_buff *skb);
633 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
634 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
635 __be32 net_spi, __be32 net_seq);
636 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
637 struct sk_buff *skb, u8 proto);
639 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
640 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
641 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
642 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
643 #define xfrm_audit_state_replay_overflow(x, s) do { ; } while (0)
644 #define xfrm_audit_state_notfound_simple(s, f) do { ; } while (0)
645 #define xfrm_audit_state_notfound(s, f, sp, sq) do { ; } while (0)
646 #define xfrm_audit_state_icvfail(x, s, p) do { ; } while (0)
647 #endif /* CONFIG_AUDITSYSCALL */
649 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
651 if (likely(policy != NULL))
652 atomic_inc(&policy->refcnt);
655 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
657 static inline void xfrm_pol_put(struct xfrm_policy *policy)
659 if (atomic_dec_and_test(&policy->refcnt))
660 xfrm_policy_destroy(policy);
663 #ifdef CONFIG_XFRM_SUB_POLICY
664 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
667 for (i = npols - 1; i >= 0; --i)
668 xfrm_pol_put(pols[i]);
671 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
673 xfrm_pol_put(pols[0]);
677 extern void __xfrm_state_destroy(struct xfrm_state *);
679 static inline void __xfrm_state_put(struct xfrm_state *x)
681 atomic_dec(&x->refcnt);
684 static inline void xfrm_state_put(struct xfrm_state *x)
686 if (atomic_dec_and_test(&x->refcnt))
687 __xfrm_state_destroy(x);
690 static inline void xfrm_state_hold(struct xfrm_state *x)
692 atomic_inc(&x->refcnt);
695 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
702 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
703 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
706 if (memcmp(a1, a2, pdw << 2))
712 mask = htonl((0xffffffff) << (32 - pbi));
714 if ((a1[pdw] ^ a2[pdw]) & mask)
722 __be16 xfrm_flowi_sport(struct flowi *fl)
728 case IPPROTO_UDPLITE:
730 port = fl->fl_ip_sport;
734 port = htons(fl->fl_icmp_type);
737 port = htons(fl->fl_mh_type);
746 __be16 xfrm_flowi_dport(struct flowi *fl)
752 case IPPROTO_UDPLITE:
754 port = fl->fl_ip_dport;
758 port = htons(fl->fl_icmp_code);
766 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
767 unsigned short family);
769 #ifdef CONFIG_SECURITY_NETWORK_XFRM
770 /* If neither has a context --> match
771 * Otherwise, both must have a context and the sids, doi, alg must match
773 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
775 return ((!s1 && !s2) ||
777 (s1->ctx_sid == s2->ctx_sid) &&
778 (s1->ctx_doi == s2->ctx_doi) &&
779 (s1->ctx_alg == s2->ctx_alg)));
782 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
788 /* A struct encoding bundle of transformations to apply to some set of flow.
790 * dst->child points to the next element of bundle.
791 * dst->xfrm points to an instanse of transformer.
793 * Due to unfortunate limitations of current routing cache, which we
794 * have no time to fix, it mirrors struct rtable and bound to the same
795 * routing key, including saddr,daddr. However, we can have many of
796 * bundles differing by session id. All the bundles grow from a parent
802 struct dst_entry dst;
806 struct dst_entry *route;
807 #ifdef CONFIG_XFRM_SUB_POLICY
808 struct flowi *origin;
809 struct xfrm_selector *partner;
812 u32 route_mtu_cached;
813 u32 child_mtu_cached;
818 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
820 dst_release(xdst->route);
821 if (likely(xdst->u.dst.xfrm))
822 xfrm_state_put(xdst->u.dst.xfrm);
823 #ifdef CONFIG_XFRM_SUB_POLICY
826 kfree(xdst->partner);
827 xdst->partner = NULL;
831 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
837 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
840 static inline struct sec_path *
841 secpath_get(struct sec_path *sp)
844 atomic_inc(&sp->refcnt);
848 extern void __secpath_destroy(struct sec_path *sp);
851 secpath_put(struct sec_path *sp)
853 if (sp && atomic_dec_and_test(&sp->refcnt))
854 __secpath_destroy(sp);
857 extern struct sec_path *secpath_dup(struct sec_path *src);
860 secpath_reset(struct sk_buff *skb)
863 secpath_put(skb->sp);
869 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
873 return addr->a4 == 0;
875 return ipv6_addr_any((struct in6_addr *)&addr->a6);
881 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
883 return (tmpl->saddr.a4 &&
884 tmpl->saddr.a4 != x->props.saddr.a4);
888 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
890 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
891 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
895 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
899 return __xfrm4_state_addr_cmp(tmpl, x);
901 return __xfrm6_state_addr_cmp(tmpl, x);
907 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
909 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
911 unsigned int family, int reverse)
913 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
915 if (sk && sk->sk_policy[XFRM_POLICY_IN])
916 return __xfrm_policy_check(sk, ndir, skb, family);
918 return (!xfrm_policy_count[dir] && !skb->sp) ||
919 (skb->dst->flags & DST_NOPOLICY) ||
920 __xfrm_policy_check(sk, ndir, skb, family);
923 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
925 return __xfrm_policy_check2(sk, dir, skb, family, 0);
928 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
930 return xfrm_policy_check(sk, dir, skb, AF_INET);
933 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
935 return xfrm_policy_check(sk, dir, skb, AF_INET6);
938 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
941 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
944 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
947 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
950 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
951 unsigned int family, int reverse);
953 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
956 return __xfrm_decode_session(skb, fl, family, 0);
959 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
963 return __xfrm_decode_session(skb, fl, family, 1);
966 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
968 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
970 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
971 (skb->dst->flags & DST_NOXFRM) ||
972 __xfrm_route_forward(skb, family);
975 static inline int xfrm4_route_forward(struct sk_buff *skb)
977 return xfrm_route_forward(skb, AF_INET);
980 static inline int xfrm6_route_forward(struct sk_buff *skb)
982 return xfrm_route_forward(skb, AF_INET6);
985 extern int __xfrm_sk_clone_policy(struct sock *sk);
987 static inline int xfrm_sk_clone_policy(struct sock *sk)
989 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
990 return __xfrm_sk_clone_policy(sk);
994 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
996 static inline void xfrm_sk_free_policy(struct sock *sk)
998 if (unlikely(sk->sk_policy[0] != NULL)) {
999 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1000 sk->sk_policy[0] = NULL;
1002 if (unlikely(sk->sk_policy[1] != NULL)) {
1003 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1004 sk->sk_policy[1] = NULL;
1010 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1011 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1012 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1013 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1014 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1018 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1022 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1026 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1028 unsigned int family)
1032 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1033 struct sk_buff *skb)
1037 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1038 struct sk_buff *skb)
1045 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1049 return (xfrm_address_t *)&fl->fl4_dst;
1051 return (xfrm_address_t *)&fl->fl6_dst;
1057 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1061 return (xfrm_address_t *)&fl->fl4_src;
1063 return (xfrm_address_t *)&fl->fl6_src;
1068 static __inline__ int
1069 __xfrm4_state_addr_check(struct xfrm_state *x,
1070 xfrm_address_t *daddr, xfrm_address_t *saddr)
1072 if (daddr->a4 == x->id.daddr.a4 &&
1073 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1078 static __inline__ int
1079 __xfrm6_state_addr_check(struct xfrm_state *x,
1080 xfrm_address_t *daddr, xfrm_address_t *saddr)
1082 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1083 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1084 ipv6_addr_any((struct in6_addr *)saddr) ||
1085 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1090 static __inline__ int
1091 xfrm_state_addr_check(struct xfrm_state *x,
1092 xfrm_address_t *daddr, xfrm_address_t *saddr,
1093 unsigned short family)
1097 return __xfrm4_state_addr_check(x, daddr, saddr);
1099 return __xfrm6_state_addr_check(x, daddr, saddr);
1104 static __inline__ int
1105 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1106 unsigned short family)
1110 return __xfrm4_state_addr_check(x,
1111 (xfrm_address_t *)&fl->fl4_dst,
1112 (xfrm_address_t *)&fl->fl4_src);
1114 return __xfrm6_state_addr_check(x,
1115 (xfrm_address_t *)&fl->fl6_dst,
1116 (xfrm_address_t *)&fl->fl6_src);
1121 static inline int xfrm_state_kern(struct xfrm_state *x)
1123 return atomic_read(&x->tunnel_users);
1126 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1128 return (!userproto || proto == userproto ||
1129 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1130 proto == IPPROTO_ESP ||
1131 proto == IPPROTO_COMP)));
1135 * xfrm algorithm information
1137 struct xfrm_algo_aead_info {
1141 struct xfrm_algo_auth_info {
1146 struct xfrm_algo_encr_info {
1151 struct xfrm_algo_comp_info {
1155 struct xfrm_algo_desc {
1160 struct xfrm_algo_aead_info aead;
1161 struct xfrm_algo_auth_info auth;
1162 struct xfrm_algo_encr_info encr;
1163 struct xfrm_algo_comp_info comp;
1165 struct sadb_alg desc;
1168 /* XFRM tunnel handlers. */
1169 struct xfrm_tunnel {
1170 int (*handler)(struct sk_buff *skb);
1171 int (*err_handler)(struct sk_buff *skb, __u32 info);
1173 struct xfrm_tunnel *next;
1177 struct xfrm6_tunnel {
1178 int (*handler)(struct sk_buff *skb);
1179 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1180 int type, int code, int offset, __be32 info);
1181 struct xfrm6_tunnel *next;
1185 extern void xfrm_init(void);
1186 extern void xfrm4_init(void);
1187 extern void xfrm_state_init(void);
1188 extern void xfrm4_state_init(void);
1190 extern int xfrm6_init(void);
1191 extern void xfrm6_fini(void);
1192 extern int xfrm6_state_init(void);
1193 extern void xfrm6_state_fini(void);
1195 static inline int xfrm6_init(void)
1199 static inline void xfrm6_fini(void)
1205 #ifdef CONFIG_XFRM_STATISTICS
1206 extern int xfrm_proc_init(void);
1209 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
1210 extern struct xfrm_state *xfrm_state_alloc(void);
1211 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1212 struct flowi *fl, struct xfrm_tmpl *tmpl,
1213 struct xfrm_policy *pol, int *err,
1214 unsigned short family);
1215 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1216 xfrm_address_t *saddr,
1217 unsigned short family,
1218 u8 mode, u8 proto, u32 reqid);
1219 extern int xfrm_state_check_expire(struct xfrm_state *x);
1220 extern void xfrm_state_insert(struct xfrm_state *x);
1221 extern int xfrm_state_add(struct xfrm_state *x);
1222 extern int xfrm_state_update(struct xfrm_state *x);
1223 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1224 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1225 #ifdef CONFIG_XFRM_SUB_POLICY
1226 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1227 int n, unsigned short family);
1228 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1229 int n, unsigned short family);
1231 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1232 int n, unsigned short family)
1237 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1238 int n, unsigned short family)
1244 struct xfrmk_sadinfo {
1245 u32 sadhcnt; /* current hash bkts */
1246 u32 sadhmcnt; /* max allowed hash bkts */
1247 u32 sadcnt; /* current running count */
1250 struct xfrmk_spdinfo {
1261 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1262 extern int xfrm_state_delete(struct xfrm_state *x);
1263 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1264 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1265 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1266 extern int xfrm_replay_check(struct xfrm_state *x,
1267 struct sk_buff *skb, __be32 seq);
1268 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1269 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1270 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1271 extern int xfrm_init_state(struct xfrm_state *x);
1272 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1273 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1275 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1276 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1277 extern int xfrm_output(struct sk_buff *skb);
1278 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1279 extern int xfrm4_extract_header(struct sk_buff *skb);
1280 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1281 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1283 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1284 extern int xfrm4_rcv(struct sk_buff *skb);
1286 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1288 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1291 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1292 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1293 extern int xfrm4_output(struct sk_buff *skb);
1294 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1295 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1296 extern int xfrm6_extract_header(struct sk_buff *skb);
1297 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1298 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1299 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1300 extern int xfrm6_rcv(struct sk_buff *skb);
1301 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1302 xfrm_address_t *saddr, u8 proto);
1303 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1304 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1305 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1306 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1307 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1308 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1309 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1310 extern int xfrm6_output(struct sk_buff *skb);
1311 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1315 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1316 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1318 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1320 return -ENOPROTOOPT;
1323 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1325 /* should not happen */
1331 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1332 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1333 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1334 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1335 struct xfrm_selector *sel,
1336 struct xfrm_sec_ctx *ctx, int delete,
1338 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1339 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1340 u32 xfrm_get_acqseq(void);
1341 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1342 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1343 xfrm_address_t *daddr, xfrm_address_t *saddr,
1344 int create, unsigned short family);
1345 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1346 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1347 struct flowi *fl, int family, int strict);
1349 #ifdef CONFIG_XFRM_MIGRATE
1350 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1351 struct xfrm_migrate *m, int num_bundles);
1352 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1353 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1354 struct xfrm_migrate *m);
1355 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1356 struct xfrm_migrate *m, int num_bundles);
1359 extern wait_queue_head_t km_waitq;
1360 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1361 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1362 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1364 extern void xfrm_input_init(void);
1365 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1367 extern void xfrm_probe_algs(void);
1368 extern int xfrm_count_auth_supported(void);
1369 extern int xfrm_count_enc_supported(void);
1370 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1371 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1372 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1373 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1374 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1375 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1376 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1377 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1378 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1383 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1386 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1387 int offset, int len, icv_update_fn_t icv_update);
1389 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1395 return (__force __u32)a->a4 - (__force __u32)b->a4;
1397 return ipv6_addr_cmp((struct in6_addr *)a,
1398 (struct in6_addr *)b);
1402 static inline int xfrm_policy_id2dir(u32 index)
1407 static inline int xfrm_aevent_is_on(void)
1413 nlsk = rcu_dereference(xfrm_nl);
1415 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1420 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1422 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1425 #ifdef CONFIG_XFRM_MIGRATE
1426 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1428 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1431 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1434 for (i = 0; i < n; i++)
1435 xfrm_state_put(*(states + i));
1438 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1441 for (i = 0; i < n; i++)
1442 xfrm_state_delete(*(states + i));
1446 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1448 return skb->sp->xvec[skb->sp->len - 1];
1451 #endif /* _NET_XFRM_H */