1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/compiler.h>
6 #include <linux/xfrm.h>
7 #include <linux/spinlock.h>
8 #include <linux/list.h>
9 #include <linux/skbuff.h>
10 #include <linux/socket.h>
11 #include <linux/pfkeyv2.h>
12 #include <linux/ipsec.h>
13 #include <linux/in6.h>
14 #include <linux/mutex.h>
15 #include <linux/audit.h>
16 #include <linux/slab.h>
17 #include <linux/refcount.h>
22 #include <net/route.h>
24 #include <net/ip6_fib.h>
26 #include <net/gro_cells.h>
28 #include <linux/interrupt.h>
30 #ifdef CONFIG_XFRM_STATISTICS
34 #define XFRM_PROTO_ESP 50
35 #define XFRM_PROTO_AH 51
36 #define XFRM_PROTO_COMP 108
37 #define XFRM_PROTO_IPIP 4
38 #define XFRM_PROTO_IPV6 41
39 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
40 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
42 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
43 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
44 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
45 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
46 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
47 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
48 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
49 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51 #ifdef CONFIG_XFRM_STATISTICS
52 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54 #define XFRM_INC_STATS(net, field) ((void)(net))
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72 Lookup is plain linear search until the first match with selector.
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
86 Bundles are cached at xrfm_policy struct (field ->bundles).
89 Resolution of xrfm_tmpl
90 -----------------------
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
119 struct xfrm_state_walk {
120 struct list_head all;
125 struct xfrm_address_filter *filter;
128 struct xfrm_state_offload {
129 struct net_device *dev;
130 unsigned long offload_handle;
131 unsigned int num_exthdrs;
135 /* Full description of state of transformer. */
137 possible_net_t xs_net;
139 struct hlist_node gclist;
140 struct hlist_node bydst;
142 struct hlist_node bysrc;
143 struct hlist_node byspi;
149 struct xfrm_selector sel;
150 struct xfrm_mark mark;
156 /* Key manager bits */
157 struct xfrm_state_walk km;
159 /* Parameters of this state. */
164 u8 aalgo, ealgo, calgo;
167 xfrm_address_t saddr;
171 struct xfrm_mark smark;
174 struct xfrm_lifetime_cfg lft;
176 /* Data for transformer */
177 struct xfrm_algo_auth *aalg;
178 struct xfrm_algo *ealg;
179 struct xfrm_algo *calg;
180 struct xfrm_algo_aead *aead;
183 /* Data for encapsulator */
184 struct xfrm_encap_tmpl *encap;
186 /* Data for care-of address */
187 xfrm_address_t *coaddr;
189 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
190 struct xfrm_state *tunnel;
192 /* If a tunnel, number of users + 1 */
193 atomic_t tunnel_users;
195 /* State for replay detection */
196 struct xfrm_replay_state replay;
197 struct xfrm_replay_state_esn *replay_esn;
199 /* Replay detection state at the time we sent the last notification */
200 struct xfrm_replay_state preplay;
201 struct xfrm_replay_state_esn *preplay_esn;
203 /* The functions for replay detection. */
204 const struct xfrm_replay *repl;
206 /* internal flag that only holds state for delayed aevent at the
211 /* Replay detection notification settings */
215 /* Replay detection notification timer */
216 struct timer_list rtimer;
219 struct xfrm_stats stats;
221 struct xfrm_lifetime_cur curlft;
222 struct tasklet_hrtimer mtimer;
224 struct xfrm_state_offload xso;
226 /* used to fix curlft->add_time when changing date */
232 struct page_frag xfrag;
234 /* Reference to data common to all the instances of this
236 const struct xfrm_type *type;
237 struct xfrm_mode *inner_mode;
238 struct xfrm_mode *inner_mode_iaf;
239 struct xfrm_mode *outer_mode;
241 const struct xfrm_type_offload *type_offload;
243 /* Security context */
244 struct xfrm_sec_ctx *security;
246 /* Private data of this transformer, format is opaque,
247 * interpreted by xfrm_type methods. */
251 static inline struct net *xs_net(struct xfrm_state *x)
253 return read_pnet(&x->xs_net);
256 /* xflags - make enum if more show up */
257 #define XFRM_TIME_DEFER 1
258 #define XFRM_SOFT_EXPIRE 2
269 /* callback structure passed from either netlink or pfkey */
286 void (*advance)(struct xfrm_state *x, __be32 net_seq);
287 int (*check)(struct xfrm_state *x,
290 int (*recheck)(struct xfrm_state *x,
293 void (*notify)(struct xfrm_state *x, int event);
294 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
298 struct xfrm_if *(*decode_session)(struct sk_buff *skb);
301 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
302 void xfrm_if_unregister_cb(void);
307 struct xfrm_policy_afinfo {
308 struct dst_ops *dst_ops;
309 struct dst_entry *(*dst_lookup)(struct net *net,
311 const xfrm_address_t *saddr,
312 const xfrm_address_t *daddr,
314 int (*get_saddr)(struct net *net, int oif,
315 xfrm_address_t *saddr,
316 xfrm_address_t *daddr,
318 void (*decode_session)(struct sk_buff *skb,
321 int (*get_tos)(const struct flowi *fl);
322 int (*init_path)(struct xfrm_dst *path,
323 struct dst_entry *dst,
325 int (*fill_dst)(struct xfrm_dst *xdst,
326 struct net_device *dev,
327 const struct flowi *fl);
328 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
331 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
332 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
333 void km_policy_notify(struct xfrm_policy *xp, int dir,
334 const struct km_event *c);
335 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
338 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
339 struct xfrm_policy *pol);
340 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
341 int __xfrm_state_delete(struct xfrm_state *x);
343 struct xfrm_state_afinfo {
347 struct module *owner;
348 const struct xfrm_type *type_map[IPPROTO_MAX];
349 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX];
350 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
352 int (*init_flags)(struct xfrm_state *x);
353 void (*init_tempsel)(struct xfrm_selector *sel,
354 const struct flowi *fl);
355 void (*init_temprop)(struct xfrm_state *x,
356 const struct xfrm_tmpl *tmpl,
357 const xfrm_address_t *daddr,
358 const xfrm_address_t *saddr);
359 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
360 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
361 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
362 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
363 int (*extract_input)(struct xfrm_state *x,
364 struct sk_buff *skb);
365 int (*extract_output)(struct xfrm_state *x,
366 struct sk_buff *skb);
367 int (*transport_finish)(struct sk_buff *skb,
369 void (*local_error)(struct sk_buff *skb, u32 mtu);
372 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
373 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
374 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
375 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
377 struct xfrm_input_afinfo {
379 int (*callback)(struct sk_buff *skb, u8 protocol,
383 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
384 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
386 void xfrm_flush_gc(void);
387 void xfrm_state_delete_tunnel(struct xfrm_state *x);
391 struct module *owner;
394 #define XFRM_TYPE_NON_FRAGMENT 1
395 #define XFRM_TYPE_REPLAY_PROT 2
396 #define XFRM_TYPE_LOCAL_COADDR 4
397 #define XFRM_TYPE_REMOTE_COADDR 8
399 int (*init_state)(struct xfrm_state *x);
400 void (*destructor)(struct xfrm_state *);
401 int (*input)(struct xfrm_state *, struct sk_buff *skb);
402 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
403 int (*reject)(struct xfrm_state *, struct sk_buff *,
404 const struct flowi *);
405 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
406 /* Estimate maximal size of result of transformation of a dgram */
407 u32 (*get_mtu)(struct xfrm_state *, int size);
410 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
411 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
413 struct xfrm_type_offload {
415 struct module *owner;
417 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
418 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
419 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
422 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
423 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
427 * Remove encapsulation header.
429 * The IP header will be moved over the top of the encapsulation
432 * On entry, the transport header shall point to where the IP header
433 * should be and the network header shall be set to where the IP
434 * header currently is. skb->data shall point to the start of the
437 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
440 * This is the actual input entry point.
442 * For transport mode and equivalent this would be identical to
443 * input2 (which does not need to be set). While tunnel mode
444 * and equivalent would set this to the tunnel encapsulation function
445 * xfrm4_prepare_input that would in turn call input2.
447 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
450 * Add encapsulation header.
452 * On exit, the transport header will be set to the start of the
453 * encapsulation header to be filled in by x->type->output and
454 * the mac header will be set to the nextheader (protocol for
455 * IPv4) field of the extension header directly preceding the
456 * encapsulation header, or in its absence, that of the top IP
457 * header. The value of the network header will always point
458 * to the top IP header while skb->data will point to the payload.
460 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
463 * This is the actual output entry point.
465 * For transport mode and equivalent this would be identical to
466 * output2 (which does not need to be set). While tunnel mode
467 * and equivalent would set this to a tunnel encapsulation function
468 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
471 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
474 * Adjust pointers into the packet and do GSO segmentation.
476 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
479 * Adjust pointers into the packet when IPsec is done at layer2.
481 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
483 struct xfrm_state_afinfo *afinfo;
484 struct module *owner;
489 /* Flags for xfrm_mode. */
491 XFRM_MODE_FLAG_TUNNEL = 1,
494 int xfrm_register_mode(struct xfrm_mode *mode, int family);
495 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
497 static inline int xfrm_af2proto(unsigned int family)
509 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
511 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
512 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
513 return x->inner_mode;
515 return x->inner_mode_iaf;
519 /* id in template is interpreted as:
520 * daddr - destination of tunnel, may be zero for transport mode.
521 * spi - zero to acquire spi. Not zero if spi is static, then
522 * daddr must be fixed too.
523 * proto - AH/ESP/IPCOMP
527 /* Source address of tunnel. Ignored, if it is not a tunnel. */
528 xfrm_address_t saddr;
530 unsigned short encap_family;
534 /* Mode: transport, tunnel etc. */
537 /* Sharing mode: unique, this session only, this user only etc. */
540 /* May skip this transfomration if no SA is found */
543 /* Skip aalgos/ealgos/calgos checks. */
546 /* Bit mask of algos allowed for acquisition */
552 #define XFRM_MAX_DEPTH 6
553 #define XFRM_MAX_OFFLOAD_DEPTH 1
555 struct xfrm_policy_walk_entry {
556 struct list_head all;
560 struct xfrm_policy_walk {
561 struct xfrm_policy_walk_entry walk;
566 struct xfrm_policy_queue {
567 struct sk_buff_head hold_queue;
568 struct timer_list hold_timer;
569 unsigned long timeout;
573 possible_net_t xp_net;
574 struct hlist_node bydst;
575 struct hlist_node byidx;
577 /* This lock only affects elements except for entry. */
580 struct timer_list timer;
586 struct xfrm_mark mark;
587 struct xfrm_selector selector;
588 struct xfrm_lifetime_cfg lft;
589 struct xfrm_lifetime_cur curlft;
590 struct xfrm_policy_walk_entry walk;
591 struct xfrm_policy_queue polq;
597 struct xfrm_sec_ctx *security;
598 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
602 static inline struct net *xp_net(const struct xfrm_policy *xp)
604 return read_pnet(&xp->xp_net);
607 struct xfrm_kmaddress {
608 xfrm_address_t local;
609 xfrm_address_t remote;
614 struct xfrm_migrate {
615 xfrm_address_t old_daddr;
616 xfrm_address_t old_saddr;
617 xfrm_address_t new_daddr;
618 xfrm_address_t new_saddr;
627 #define XFRM_KM_TIMEOUT 30
629 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
630 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
632 /* default aevent timeout in units of 100ms */
633 #define XFRM_AE_ETIME 10
634 /* Async Event timer multiplier */
635 #define XFRM_AE_ETH_M 10
636 /* default seq threshold size */
637 #define XFRM_AE_SEQT_SIZE 2
640 struct list_head list;
641 int (*notify)(struct xfrm_state *x, const struct km_event *c);
642 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
643 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
644 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
645 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
646 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
647 int (*migrate)(const struct xfrm_selector *sel,
649 const struct xfrm_migrate *m,
651 const struct xfrm_kmaddress *k,
652 const struct xfrm_encap_tmpl *encap);
653 bool (*is_alive)(const struct km_event *c);
656 int xfrm_register_km(struct xfrm_mgr *km);
657 int xfrm_unregister_km(struct xfrm_mgr *km);
659 struct xfrm_tunnel_skb_cb {
661 struct inet_skb_parm h4;
662 struct inet6_skb_parm h6;
666 struct ip_tunnel *ip4;
671 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
674 * This structure is used for the duration where packets are being
675 * transformed by IPsec. As soon as the packet leaves IPsec the
676 * area beyond the generic IP part may be overwritten.
679 struct xfrm_tunnel_skb_cb header;
681 /* Sequence number for replay protection. */
694 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
697 * This structure is used by the afinfo prepare_input/prepare_output functions
698 * to transmit header information to the mode input/output functions.
700 struct xfrm_mode_skb_cb {
701 struct xfrm_tunnel_skb_cb header;
703 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
707 /* IP header length (excluding options or extension headers). */
710 /* TOS for IPv4, class for IPv6. */
713 /* TTL for IPv4, hop limitfor IPv6. */
716 /* Protocol for IPv4, NH for IPv6. */
719 /* Option length for IPv4, zero for IPv6. */
722 /* Used by IPv6 only, zero for IPv4. */
726 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
729 * This structure is used by the input processing to locate the SPI and
730 * related information.
732 struct xfrm_spi_skb_cb {
733 struct xfrm_tunnel_skb_cb header;
735 unsigned int daddroff;
740 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
742 #ifdef CONFIG_AUDITSYSCALL
743 static inline struct audit_buffer *xfrm_audit_start(const char *op)
745 struct audit_buffer *audit_buf = NULL;
747 if (audit_enabled == AUDIT_OFF)
749 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
750 AUDIT_MAC_IPSEC_EVENT);
751 if (audit_buf == NULL)
753 audit_log_format(audit_buf, "op=%s", op);
757 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
758 struct audit_buffer *audit_buf)
760 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
761 audit_get_loginuid(current) :
763 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
766 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
767 audit_log_task_context(audit_buf);
770 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
771 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
773 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
774 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
775 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
776 struct sk_buff *skb);
777 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
779 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
780 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
782 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
786 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
791 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
796 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
801 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
806 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
811 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
812 struct sk_buff *skb, __be32 net_seq)
816 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
821 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
822 __be32 net_spi, __be32 net_seq)
826 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
827 struct sk_buff *skb, u8 proto)
830 #endif /* CONFIG_AUDITSYSCALL */
832 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
834 if (likely(policy != NULL))
835 refcount_inc(&policy->refcnt);
838 void xfrm_policy_destroy(struct xfrm_policy *policy);
840 static inline void xfrm_pol_put(struct xfrm_policy *policy)
842 if (refcount_dec_and_test(&policy->refcnt))
843 xfrm_policy_destroy(policy);
846 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
849 for (i = npols - 1; i >= 0; --i)
850 xfrm_pol_put(pols[i]);
853 void __xfrm_state_destroy(struct xfrm_state *);
855 static inline void __xfrm_state_put(struct xfrm_state *x)
857 refcount_dec(&x->refcnt);
860 static inline void xfrm_state_put(struct xfrm_state *x)
862 if (refcount_dec_and_test(&x->refcnt))
863 __xfrm_state_destroy(x);
866 static inline void xfrm_state_hold(struct xfrm_state *x)
868 refcount_inc(&x->refcnt);
871 static inline bool addr_match(const void *token1, const void *token2,
872 unsigned int prefixlen)
874 const __be32 *a1 = token1;
875 const __be32 *a2 = token2;
879 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
880 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
883 if (memcmp(a1, a2, pdw << 2))
889 mask = htonl((0xffffffff) << (32 - pbi));
891 if ((a1[pdw] ^ a2[pdw]) & mask)
898 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
900 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
901 if (sizeof(long) == 4 && prefixlen == 0)
903 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
907 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
910 switch(fl->flowi_proto) {
913 case IPPROTO_UDPLITE:
915 port = uli->ports.sport;
919 port = htons(uli->icmpt.type);
922 port = htons(uli->mht.type);
925 port = htons(ntohl(uli->gre_key) >> 16);
934 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
937 switch(fl->flowi_proto) {
940 case IPPROTO_UDPLITE:
942 port = uli->ports.dport;
946 port = htons(uli->icmpt.code);
949 port = htons(ntohl(uli->gre_key) & 0xffff);
957 bool xfrm_selector_match(const struct xfrm_selector *sel,
958 const struct flowi *fl, unsigned short family);
960 #ifdef CONFIG_SECURITY_NETWORK_XFRM
961 /* If neither has a context --> match
962 * Otherwise, both must have a context and the sids, doi, alg must match
964 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
966 return ((!s1 && !s2) ||
968 (s1->ctx_sid == s2->ctx_sid) &&
969 (s1->ctx_doi == s2->ctx_doi) &&
970 (s1->ctx_alg == s2->ctx_alg)));
973 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
979 /* A struct encoding bundle of transformations to apply to some set of flow.
981 * xdst->child points to the next element of bundle.
982 * dst->xfrm points to an instanse of transformer.
984 * Due to unfortunate limitations of current routing cache, which we
985 * have no time to fix, it mirrors struct rtable and bound to the same
986 * routing key, including saddr,daddr. However, we can have many of
987 * bundles differing by session id. All the bundles grow from a parent
992 struct dst_entry dst;
996 struct dst_entry *route;
997 struct dst_entry *child;
998 struct dst_entry *path;
999 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1000 int num_pols, num_xfrms;
1003 u32 route_mtu_cached;
1004 u32 child_mtu_cached;
1009 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1013 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1018 return (struct dst_entry *) dst;
1021 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1025 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1033 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1035 xdst->child = child;
1038 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1040 xfrm_pols_put(xdst->pols, xdst->num_pols);
1041 dst_release(xdst->route);
1042 if (likely(xdst->u.dst.xfrm))
1043 xfrm_state_put(xdst->u.dst.xfrm);
1047 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1049 struct xfrm_if_parms {
1050 char name[IFNAMSIZ]; /* name of XFRM device */
1051 int link; /* ifindex of underlying L2 interface */
1052 u32 if_id; /* interface identifyer */
1056 struct xfrm_if __rcu *next; /* next interface in list */
1057 struct net_device *dev; /* virtual device associated with interface */
1058 struct net_device *phydev; /* physical device */
1059 struct net *net; /* netns for packet i/o */
1060 struct xfrm_if_parms p; /* interface parms */
1062 struct gro_cells gro_cells;
1065 struct xfrm_offload {
1066 /* Output sequence number for replay protection on offloading. */
1073 #define SA_DELETE_REQ 1
1074 #define CRYPTO_DONE 2
1075 #define CRYPTO_NEXT_DONE 4
1076 #define CRYPTO_FALLBACK 8
1077 #define XFRM_GSO_SEGMENT 16
1079 #define XFRM_ESP_NO_TRAILER 64
1080 #define XFRM_DEV_RESUME 128
1083 #define CRYPTO_SUCCESS 1
1084 #define CRYPTO_GENERIC_ERROR 2
1085 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1086 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1087 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1088 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1089 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1090 #define CRYPTO_INVALID_PROTOCOL 128
1100 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1101 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1104 static inline int secpath_exists(struct sk_buff *skb)
1107 return skb->sp != NULL;
1113 static inline struct sec_path *
1114 secpath_get(struct sec_path *sp)
1117 refcount_inc(&sp->refcnt);
1121 void __secpath_destroy(struct sec_path *sp);
1124 secpath_put(struct sec_path *sp)
1126 if (sp && refcount_dec_and_test(&sp->refcnt))
1127 __secpath_destroy(sp);
1130 struct sec_path *secpath_dup(struct sec_path *src);
1131 int secpath_set(struct sk_buff *skb);
1134 secpath_reset(struct sk_buff *skb)
1137 secpath_put(skb->sp);
1143 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1147 return addr->a4 == 0;
1149 return ipv6_addr_any(&addr->in6);
1155 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1157 return (tmpl->saddr.a4 &&
1158 tmpl->saddr.a4 != x->props.saddr.a4);
1162 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1164 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1165 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1169 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1173 return __xfrm4_state_addr_cmp(tmpl, x);
1175 return __xfrm6_state_addr_cmp(tmpl, x);
1181 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1182 unsigned short family);
1184 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1185 struct sk_buff *skb,
1186 unsigned int family, int reverse)
1188 struct net *net = dev_net(skb->dev);
1189 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1191 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1192 return __xfrm_policy_check(sk, ndir, skb, family);
1194 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1195 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1196 __xfrm_policy_check(sk, ndir, skb, family);
1199 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1201 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1204 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1206 return xfrm_policy_check(sk, dir, skb, AF_INET);
1209 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1211 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1214 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1215 struct sk_buff *skb)
1217 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1220 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1221 struct sk_buff *skb)
1223 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1226 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1227 unsigned int family, int reverse);
1229 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1230 unsigned int family)
1232 return __xfrm_decode_session(skb, fl, family, 0);
1235 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1237 unsigned int family)
1239 return __xfrm_decode_session(skb, fl, family, 1);
1242 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1244 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1246 struct net *net = dev_net(skb->dev);
1248 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1249 (skb_dst(skb)->flags & DST_NOXFRM) ||
1250 __xfrm_route_forward(skb, family);
1253 static inline int xfrm4_route_forward(struct sk_buff *skb)
1255 return xfrm_route_forward(skb, AF_INET);
1258 static inline int xfrm6_route_forward(struct sk_buff *skb)
1260 return xfrm_route_forward(skb, AF_INET6);
1263 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1265 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1267 sk->sk_policy[0] = NULL;
1268 sk->sk_policy[1] = NULL;
1269 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1270 return __xfrm_sk_clone_policy(sk, osk);
1274 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1276 static inline void xfrm_sk_free_policy(struct sock *sk)
1278 struct xfrm_policy *pol;
1280 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1281 if (unlikely(pol != NULL)) {
1282 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1283 sk->sk_policy[0] = NULL;
1285 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1286 if (unlikely(pol != NULL)) {
1287 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1288 sk->sk_policy[1] = NULL;
1294 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1295 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1296 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1297 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1298 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1302 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1306 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1310 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1312 unsigned int family)
1316 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1317 struct sk_buff *skb)
1321 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1322 struct sk_buff *skb)
1329 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1333 return (xfrm_address_t *)&fl->u.ip4.daddr;
1335 return (xfrm_address_t *)&fl->u.ip6.daddr;
1341 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1345 return (xfrm_address_t *)&fl->u.ip4.saddr;
1347 return (xfrm_address_t *)&fl->u.ip6.saddr;
1353 void xfrm_flowi_addr_get(const struct flowi *fl,
1354 xfrm_address_t *saddr, xfrm_address_t *daddr,
1355 unsigned short family)
1359 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1360 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1363 saddr->in6 = fl->u.ip6.saddr;
1364 daddr->in6 = fl->u.ip6.daddr;
1369 static __inline__ int
1370 __xfrm4_state_addr_check(const struct xfrm_state *x,
1371 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1373 if (daddr->a4 == x->id.daddr.a4 &&
1374 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1379 static __inline__ int
1380 __xfrm6_state_addr_check(const struct xfrm_state *x,
1381 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1383 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1384 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1385 ipv6_addr_any((struct in6_addr *)saddr) ||
1386 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1391 static __inline__ int
1392 xfrm_state_addr_check(const struct xfrm_state *x,
1393 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1394 unsigned short family)
1398 return __xfrm4_state_addr_check(x, daddr, saddr);
1400 return __xfrm6_state_addr_check(x, daddr, saddr);
1405 static __inline__ int
1406 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1407 unsigned short family)
1411 return __xfrm4_state_addr_check(x,
1412 (const xfrm_address_t *)&fl->u.ip4.daddr,
1413 (const xfrm_address_t *)&fl->u.ip4.saddr);
1415 return __xfrm6_state_addr_check(x,
1416 (const xfrm_address_t *)&fl->u.ip6.daddr,
1417 (const xfrm_address_t *)&fl->u.ip6.saddr);
1422 static inline int xfrm_state_kern(const struct xfrm_state *x)
1424 return atomic_read(&x->tunnel_users);
1427 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1429 return (!userproto || proto == userproto ||
1430 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1431 proto == IPPROTO_ESP ||
1432 proto == IPPROTO_COMP)));
1436 * xfrm algorithm information
1438 struct xfrm_algo_aead_info {
1443 struct xfrm_algo_auth_info {
1448 struct xfrm_algo_encr_info {
1454 struct xfrm_algo_comp_info {
1458 struct xfrm_algo_desc {
1462 u8 pfkey_supported:1;
1464 struct xfrm_algo_aead_info aead;
1465 struct xfrm_algo_auth_info auth;
1466 struct xfrm_algo_encr_info encr;
1467 struct xfrm_algo_comp_info comp;
1469 struct sadb_alg desc;
1472 /* XFRM protocol handlers. */
1473 struct xfrm4_protocol {
1474 int (*handler)(struct sk_buff *skb);
1475 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1477 int (*cb_handler)(struct sk_buff *skb, int err);
1478 int (*err_handler)(struct sk_buff *skb, u32 info);
1480 struct xfrm4_protocol __rcu *next;
1484 struct xfrm6_protocol {
1485 int (*handler)(struct sk_buff *skb);
1486 int (*cb_handler)(struct sk_buff *skb, int err);
1487 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1488 u8 type, u8 code, int offset, __be32 info);
1490 struct xfrm6_protocol __rcu *next;
1494 /* XFRM tunnel handlers. */
1495 struct xfrm_tunnel {
1496 int (*handler)(struct sk_buff *skb);
1497 int (*err_handler)(struct sk_buff *skb, u32 info);
1499 struct xfrm_tunnel __rcu *next;
1503 struct xfrm6_tunnel {
1504 int (*handler)(struct sk_buff *skb);
1505 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1506 u8 type, u8 code, int offset, __be32 info);
1507 struct xfrm6_tunnel __rcu *next;
1511 void xfrm_init(void);
1512 void xfrm4_init(void);
1513 int xfrm_state_init(struct net *net);
1514 void xfrm_state_fini(struct net *net);
1515 void xfrm4_state_init(void);
1516 void xfrm4_protocol_init(void);
1518 int xfrm6_init(void);
1519 void xfrm6_fini(void);
1520 int xfrm6_state_init(void);
1521 void xfrm6_state_fini(void);
1522 int xfrm6_protocol_init(void);
1523 void xfrm6_protocol_fini(void);
1525 static inline int xfrm6_init(void)
1529 static inline void xfrm6_fini(void)
1535 #ifdef CONFIG_XFRM_STATISTICS
1536 int xfrm_proc_init(struct net *net);
1537 void xfrm_proc_fini(struct net *net);
1540 int xfrm_sysctl_init(struct net *net);
1541 #ifdef CONFIG_SYSCTL
1542 void xfrm_sysctl_fini(struct net *net);
1544 static inline void xfrm_sysctl_fini(struct net *net)
1549 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1550 struct xfrm_address_filter *filter);
1551 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1552 int (*func)(struct xfrm_state *, int, void*), void *);
1553 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1554 struct xfrm_state *xfrm_state_alloc(struct net *net);
1555 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1556 const xfrm_address_t *saddr,
1557 const struct flowi *fl,
1558 struct xfrm_tmpl *tmpl,
1559 struct xfrm_policy *pol, int *err,
1560 unsigned short family, u32 if_id);
1561 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1562 xfrm_address_t *daddr,
1563 xfrm_address_t *saddr,
1564 unsigned short family,
1565 u8 mode, u8 proto, u32 reqid);
1566 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1567 unsigned short family);
1568 int xfrm_state_check_expire(struct xfrm_state *x);
1569 void xfrm_state_insert(struct xfrm_state *x);
1570 int xfrm_state_add(struct xfrm_state *x);
1571 int xfrm_state_update(struct xfrm_state *x);
1572 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1573 const xfrm_address_t *daddr, __be32 spi,
1574 u8 proto, unsigned short family);
1575 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1576 const xfrm_address_t *daddr,
1577 const xfrm_address_t *saddr,
1579 unsigned short family);
1580 #ifdef CONFIG_XFRM_SUB_POLICY
1581 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1582 unsigned short family, struct net *net);
1583 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1584 unsigned short family);
1586 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1587 int n, unsigned short family, struct net *net)
1592 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1593 int n, unsigned short family)
1599 struct xfrmk_sadinfo {
1600 u32 sadhcnt; /* current hash bkts */
1601 u32 sadhmcnt; /* max allowed hash bkts */
1602 u32 sadcnt; /* current running count */
1605 struct xfrmk_spdinfo {
1616 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1617 int xfrm_state_delete(struct xfrm_state *x);
1618 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1619 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1620 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1621 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1622 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1623 int xfrm_init_replay(struct xfrm_state *x);
1624 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1625 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1626 int xfrm_init_state(struct xfrm_state *x);
1627 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1628 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1629 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1630 int xfrm_trans_queue(struct sk_buff *skb,
1631 int (*finish)(struct net *, struct sock *,
1633 int xfrm_output_resume(struct sk_buff *skb, int err);
1634 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1635 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1636 void xfrm_local_error(struct sk_buff *skb, int mtu);
1637 int xfrm4_extract_header(struct sk_buff *skb);
1638 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1639 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1641 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1642 int xfrm4_rcv(struct sk_buff *skb);
1643 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1645 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1647 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1648 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1649 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1650 return xfrm_input(skb, nexthdr, spi, 0);
1653 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1654 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1655 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1656 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1657 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1658 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1659 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1660 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1661 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1662 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1663 int xfrm6_extract_header(struct sk_buff *skb);
1664 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1665 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1667 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1668 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1669 int xfrm6_rcv(struct sk_buff *skb);
1670 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1671 xfrm_address_t *saddr, u8 proto);
1672 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1673 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1674 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1675 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1676 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1677 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1678 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1679 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1680 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1681 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1682 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1683 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1684 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1688 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1689 int xfrm_user_policy(struct sock *sk, int optname,
1690 u8 __user *optval, int optlen);
1692 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1694 return -ENOPROTOOPT;
1697 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1699 /* should not happen */
1705 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1706 const xfrm_address_t *saddr,
1707 const xfrm_address_t *daddr,
1708 int family, u32 mark);
1710 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1712 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1713 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1714 int (*func)(struct xfrm_policy *, int, int, void*),
1716 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1717 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1718 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1720 struct xfrm_selector *sel,
1721 struct xfrm_sec_ctx *ctx, int delete,
1723 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1724 int dir, u32 id, int delete, int *err);
1725 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1726 void xfrm_policy_hash_rebuild(struct net *net);
1727 u32 xfrm_get_acqseq(void);
1728 int verify_spi_info(u8 proto, u32 min, u32 max);
1729 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1730 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1731 u8 mode, u32 reqid, u32 if_id, u8 proto,
1732 const xfrm_address_t *daddr,
1733 const xfrm_address_t *saddr, int create,
1734 unsigned short family);
1735 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1737 #ifdef CONFIG_XFRM_MIGRATE
1738 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1739 const struct xfrm_migrate *m, int num_bundles,
1740 const struct xfrm_kmaddress *k,
1741 const struct xfrm_encap_tmpl *encap);
1742 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1743 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1744 struct xfrm_migrate *m,
1745 struct xfrm_encap_tmpl *encap);
1746 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1747 struct xfrm_migrate *m, int num_bundles,
1748 struct xfrm_kmaddress *k, struct net *net,
1749 struct xfrm_encap_tmpl *encap);
1752 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1753 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1754 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1755 xfrm_address_t *addr);
1757 void xfrm_input_init(void);
1758 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1760 void xfrm_probe_algs(void);
1761 int xfrm_count_pfkey_auth_supported(void);
1762 int xfrm_count_pfkey_enc_supported(void);
1763 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1764 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1765 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1766 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1767 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1768 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1769 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1770 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1771 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1774 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1775 const xfrm_address_t *b)
1777 return ipv6_addr_equal((const struct in6_addr *)a,
1778 (const struct in6_addr *)b);
1781 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1782 const xfrm_address_t *b,
1788 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1790 return xfrm6_addr_equal(a, b);
1794 static inline int xfrm_policy_id2dir(u32 index)
1800 static inline int xfrm_aevent_is_on(struct net *net)
1806 nlsk = rcu_dereference(net->xfrm.nlsk);
1808 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1813 static inline int xfrm_acquire_is_on(struct net *net)
1819 nlsk = rcu_dereference(net->xfrm.nlsk);
1821 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1828 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1830 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1833 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1835 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1838 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1840 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1843 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1845 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1848 #ifdef CONFIG_XFRM_MIGRATE
1849 static inline int xfrm_replay_clone(struct xfrm_state *x,
1850 struct xfrm_state *orig)
1852 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1857 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1858 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1860 x->preplay_esn = kmemdup(x->replay_esn,
1861 xfrm_replay_state_esn_len(x->replay_esn),
1863 if (!x->preplay_esn) {
1864 kfree(x->replay_esn);
1871 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1873 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1877 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1879 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1882 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1884 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1887 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1890 for (i = 0; i < n; i++)
1891 xfrm_state_put(*(states + i));
1894 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1897 for (i = 0; i < n; i++)
1898 xfrm_state_delete(*(states + i));
1903 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1905 return skb->sp->xvec[skb->sp->len - 1];
1909 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1912 struct sec_path *sp = skb->sp;
1914 if (!sp || !sp->olen || sp->len != sp->olen)
1917 return &sp->ovec[sp->olen - 1];
1923 void __init xfrm_dev_init(void);
1925 #ifdef CONFIG_XFRM_OFFLOAD
1926 void xfrm_dev_resume(struct sk_buff *skb);
1927 void xfrm_dev_backlog(struct softnet_data *sd);
1928 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1929 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1930 struct xfrm_user_offload *xuo);
1931 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1933 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1935 struct xfrm_state_offload *xso = &x->xso;
1937 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1938 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1941 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1943 struct xfrm_state *x = dst->xfrm;
1944 struct xfrm_dst *xdst;
1946 if (!x || !x->type_offload)
1949 xdst = (struct xfrm_dst *) dst;
1950 if (!x->xso.offload_handle && !xdst->child->xfrm)
1952 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1959 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1961 struct xfrm_state_offload *xso = &x->xso;
1964 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1967 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1969 struct xfrm_state_offload *xso = &x->xso;
1970 struct net_device *dev = xso->dev;
1972 if (dev && dev->xfrmdev_ops) {
1973 if (dev->xfrmdev_ops->xdo_dev_state_free)
1974 dev->xfrmdev_ops->xdo_dev_state_free(x);
1980 static inline void xfrm_dev_resume(struct sk_buff *skb)
1984 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1988 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1993 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1998 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2002 static inline void xfrm_dev_state_free(struct xfrm_state *x)
2006 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2011 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2015 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2021 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2023 if (attrs[XFRMA_MARK])
2024 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2031 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2036 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2040 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2042 struct xfrm_mark *m = &x->props.smark;
2044 return (m->v & m->m) | (mark & ~m->m);
2047 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2052 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2056 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2057 unsigned int family)
2059 bool tunnel = false;
2063 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2067 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2071 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2076 #endif /* _NET_XFRM_H */