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,
299 unsigned short family);
302 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
303 void xfrm_if_unregister_cb(void);
308 struct xfrm_policy_afinfo {
309 struct dst_ops *dst_ops;
310 struct dst_entry *(*dst_lookup)(struct net *net,
312 const xfrm_address_t *saddr,
313 const xfrm_address_t *daddr,
315 int (*get_saddr)(struct net *net, int oif,
316 xfrm_address_t *saddr,
317 xfrm_address_t *daddr,
319 void (*decode_session)(struct sk_buff *skb,
322 int (*get_tos)(const struct flowi *fl);
323 int (*init_path)(struct xfrm_dst *path,
324 struct dst_entry *dst,
326 int (*fill_dst)(struct xfrm_dst *xdst,
327 struct net_device *dev,
328 const struct flowi *fl);
329 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
332 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
333 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
334 void km_policy_notify(struct xfrm_policy *xp, int dir,
335 const struct km_event *c);
336 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
339 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
340 struct xfrm_policy *pol);
341 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
342 int __xfrm_state_delete(struct xfrm_state *x);
344 struct xfrm_state_afinfo {
348 struct module *owner;
349 const struct xfrm_type *type_map[IPPROTO_MAX];
350 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX];
351 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
353 int (*init_flags)(struct xfrm_state *x);
354 void (*init_tempsel)(struct xfrm_selector *sel,
355 const struct flowi *fl);
356 void (*init_temprop)(struct xfrm_state *x,
357 const struct xfrm_tmpl *tmpl,
358 const xfrm_address_t *daddr,
359 const xfrm_address_t *saddr);
360 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
361 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
362 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
363 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
364 int (*extract_input)(struct xfrm_state *x,
365 struct sk_buff *skb);
366 int (*extract_output)(struct xfrm_state *x,
367 struct sk_buff *skb);
368 int (*transport_finish)(struct sk_buff *skb,
370 void (*local_error)(struct sk_buff *skb, u32 mtu);
373 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
374 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
375 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
376 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
378 struct xfrm_input_afinfo {
380 int (*callback)(struct sk_buff *skb, u8 protocol,
384 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
385 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
387 void xfrm_flush_gc(void);
388 void xfrm_state_delete_tunnel(struct xfrm_state *x);
392 struct module *owner;
395 #define XFRM_TYPE_NON_FRAGMENT 1
396 #define XFRM_TYPE_REPLAY_PROT 2
397 #define XFRM_TYPE_LOCAL_COADDR 4
398 #define XFRM_TYPE_REMOTE_COADDR 8
400 int (*init_state)(struct xfrm_state *x);
401 void (*destructor)(struct xfrm_state *);
402 int (*input)(struct xfrm_state *, struct sk_buff *skb);
403 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
404 int (*reject)(struct xfrm_state *, struct sk_buff *,
405 const struct flowi *);
406 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
407 /* Estimate maximal size of result of transformation of a dgram */
408 u32 (*get_mtu)(struct xfrm_state *, int size);
411 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
412 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
414 struct xfrm_type_offload {
416 struct module *owner;
418 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
419 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
420 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
423 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
424 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
428 * Remove encapsulation header.
430 * The IP header will be moved over the top of the encapsulation
433 * On entry, the transport header shall point to where the IP header
434 * should be and the network header shall be set to where the IP
435 * header currently is. skb->data shall point to the start of the
438 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
441 * This is the actual input entry point.
443 * For transport mode and equivalent this would be identical to
444 * input2 (which does not need to be set). While tunnel mode
445 * and equivalent would set this to the tunnel encapsulation function
446 * xfrm4_prepare_input that would in turn call input2.
448 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
451 * Add encapsulation header.
453 * On exit, the transport header will be set to the start of the
454 * encapsulation header to be filled in by x->type->output and
455 * the mac header will be set to the nextheader (protocol for
456 * IPv4) field of the extension header directly preceding the
457 * encapsulation header, or in its absence, that of the top IP
458 * header. The value of the network header will always point
459 * to the top IP header while skb->data will point to the payload.
461 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
464 * This is the actual output entry point.
466 * For transport mode and equivalent this would be identical to
467 * output2 (which does not need to be set). While tunnel mode
468 * and equivalent would set this to a tunnel encapsulation function
469 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
472 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
475 * Adjust pointers into the packet and do GSO segmentation.
477 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
480 * Adjust pointers into the packet when IPsec is done at layer2.
482 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
484 struct xfrm_state_afinfo *afinfo;
485 struct module *owner;
490 /* Flags for xfrm_mode. */
492 XFRM_MODE_FLAG_TUNNEL = 1,
495 int xfrm_register_mode(struct xfrm_mode *mode, int family);
496 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
498 static inline int xfrm_af2proto(unsigned int family)
510 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
512 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
513 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
514 return x->inner_mode;
516 return x->inner_mode_iaf;
520 /* id in template is interpreted as:
521 * daddr - destination of tunnel, may be zero for transport mode.
522 * spi - zero to acquire spi. Not zero if spi is static, then
523 * daddr must be fixed too.
524 * proto - AH/ESP/IPCOMP
528 /* Source address of tunnel. Ignored, if it is not a tunnel. */
529 xfrm_address_t saddr;
531 unsigned short encap_family;
535 /* Mode: transport, tunnel etc. */
538 /* Sharing mode: unique, this session only, this user only etc. */
541 /* May skip this transfomration if no SA is found */
544 /* Skip aalgos/ealgos/calgos checks. */
547 /* Bit mask of algos allowed for acquisition */
553 #define XFRM_MAX_DEPTH 6
554 #define XFRM_MAX_OFFLOAD_DEPTH 1
556 struct xfrm_policy_walk_entry {
557 struct list_head all;
561 struct xfrm_policy_walk {
562 struct xfrm_policy_walk_entry walk;
567 struct xfrm_policy_queue {
568 struct sk_buff_head hold_queue;
569 struct timer_list hold_timer;
570 unsigned long timeout;
574 possible_net_t xp_net;
575 struct hlist_node bydst;
576 struct hlist_node byidx;
578 /* This lock only affects elements except for entry. */
581 struct timer_list timer;
587 struct xfrm_mark mark;
588 struct xfrm_selector selector;
589 struct xfrm_lifetime_cfg lft;
590 struct xfrm_lifetime_cur curlft;
591 struct xfrm_policy_walk_entry walk;
592 struct xfrm_policy_queue polq;
598 struct xfrm_sec_ctx *security;
599 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
603 static inline struct net *xp_net(const struct xfrm_policy *xp)
605 return read_pnet(&xp->xp_net);
608 struct xfrm_kmaddress {
609 xfrm_address_t local;
610 xfrm_address_t remote;
615 struct xfrm_migrate {
616 xfrm_address_t old_daddr;
617 xfrm_address_t old_saddr;
618 xfrm_address_t new_daddr;
619 xfrm_address_t new_saddr;
628 #define XFRM_KM_TIMEOUT 30
630 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
631 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
633 /* default aevent timeout in units of 100ms */
634 #define XFRM_AE_ETIME 10
635 /* Async Event timer multiplier */
636 #define XFRM_AE_ETH_M 10
637 /* default seq threshold size */
638 #define XFRM_AE_SEQT_SIZE 2
641 struct list_head list;
642 int (*notify)(struct xfrm_state *x, const struct km_event *c);
643 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
644 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
645 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
646 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
647 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
648 int (*migrate)(const struct xfrm_selector *sel,
650 const struct xfrm_migrate *m,
652 const struct xfrm_kmaddress *k,
653 const struct xfrm_encap_tmpl *encap);
654 bool (*is_alive)(const struct km_event *c);
657 int xfrm_register_km(struct xfrm_mgr *km);
658 int xfrm_unregister_km(struct xfrm_mgr *km);
660 struct xfrm_tunnel_skb_cb {
662 struct inet_skb_parm h4;
663 struct inet6_skb_parm h6;
667 struct ip_tunnel *ip4;
672 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
675 * This structure is used for the duration where packets are being
676 * transformed by IPsec. As soon as the packet leaves IPsec the
677 * area beyond the generic IP part may be overwritten.
680 struct xfrm_tunnel_skb_cb header;
682 /* Sequence number for replay protection. */
695 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
698 * This structure is used by the afinfo prepare_input/prepare_output functions
699 * to transmit header information to the mode input/output functions.
701 struct xfrm_mode_skb_cb {
702 struct xfrm_tunnel_skb_cb header;
704 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
708 /* IP header length (excluding options or extension headers). */
711 /* TOS for IPv4, class for IPv6. */
714 /* TTL for IPv4, hop limitfor IPv6. */
717 /* Protocol for IPv4, NH for IPv6. */
720 /* Option length for IPv4, zero for IPv6. */
723 /* Used by IPv6 only, zero for IPv4. */
727 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
730 * This structure is used by the input processing to locate the SPI and
731 * related information.
733 struct xfrm_spi_skb_cb {
734 struct xfrm_tunnel_skb_cb header;
736 unsigned int daddroff;
741 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
743 #ifdef CONFIG_AUDITSYSCALL
744 static inline struct audit_buffer *xfrm_audit_start(const char *op)
746 struct audit_buffer *audit_buf = NULL;
748 if (audit_enabled == AUDIT_OFF)
750 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
751 AUDIT_MAC_IPSEC_EVENT);
752 if (audit_buf == NULL)
754 audit_log_format(audit_buf, "op=%s", op);
758 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
759 struct audit_buffer *audit_buf)
761 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
762 audit_get_loginuid(current) :
764 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
767 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
768 audit_log_task_context(audit_buf);
771 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
772 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
774 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
775 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
776 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
777 struct sk_buff *skb);
778 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
780 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
781 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
783 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
787 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
792 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
797 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
802 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
807 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
812 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
813 struct sk_buff *skb, __be32 net_seq)
817 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
822 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
823 __be32 net_spi, __be32 net_seq)
827 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
828 struct sk_buff *skb, u8 proto)
831 #endif /* CONFIG_AUDITSYSCALL */
833 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
835 if (likely(policy != NULL))
836 refcount_inc(&policy->refcnt);
839 void xfrm_policy_destroy(struct xfrm_policy *policy);
841 static inline void xfrm_pol_put(struct xfrm_policy *policy)
843 if (refcount_dec_and_test(&policy->refcnt))
844 xfrm_policy_destroy(policy);
847 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
850 for (i = npols - 1; i >= 0; --i)
851 xfrm_pol_put(pols[i]);
854 void __xfrm_state_destroy(struct xfrm_state *, bool);
856 static inline void __xfrm_state_put(struct xfrm_state *x)
858 refcount_dec(&x->refcnt);
861 static inline void xfrm_state_put(struct xfrm_state *x)
863 if (refcount_dec_and_test(&x->refcnt))
864 __xfrm_state_destroy(x, false);
867 static inline void xfrm_state_put_sync(struct xfrm_state *x)
869 if (refcount_dec_and_test(&x->refcnt))
870 __xfrm_state_destroy(x, true);
873 static inline void xfrm_state_hold(struct xfrm_state *x)
875 refcount_inc(&x->refcnt);
878 static inline bool addr_match(const void *token1, const void *token2,
879 unsigned int prefixlen)
881 const __be32 *a1 = token1;
882 const __be32 *a2 = token2;
886 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
887 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
890 if (memcmp(a1, a2, pdw << 2))
896 mask = htonl((0xffffffff) << (32 - pbi));
898 if ((a1[pdw] ^ a2[pdw]) & mask)
905 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
907 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
908 if (sizeof(long) == 4 && prefixlen == 0)
910 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
914 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
917 switch(fl->flowi_proto) {
920 case IPPROTO_UDPLITE:
922 port = uli->ports.sport;
926 port = htons(uli->icmpt.type);
929 port = htons(uli->mht.type);
932 port = htons(ntohl(uli->gre_key) >> 16);
941 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
944 switch(fl->flowi_proto) {
947 case IPPROTO_UDPLITE:
949 port = uli->ports.dport;
953 port = htons(uli->icmpt.code);
956 port = htons(ntohl(uli->gre_key) & 0xffff);
964 bool xfrm_selector_match(const struct xfrm_selector *sel,
965 const struct flowi *fl, unsigned short family);
967 #ifdef CONFIG_SECURITY_NETWORK_XFRM
968 /* If neither has a context --> match
969 * Otherwise, both must have a context and the sids, doi, alg must match
971 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
973 return ((!s1 && !s2) ||
975 (s1->ctx_sid == s2->ctx_sid) &&
976 (s1->ctx_doi == s2->ctx_doi) &&
977 (s1->ctx_alg == s2->ctx_alg)));
980 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
986 /* A struct encoding bundle of transformations to apply to some set of flow.
988 * xdst->child points to the next element of bundle.
989 * dst->xfrm points to an instanse of transformer.
991 * Due to unfortunate limitations of current routing cache, which we
992 * have no time to fix, it mirrors struct rtable and bound to the same
993 * routing key, including saddr,daddr. However, we can have many of
994 * bundles differing by session id. All the bundles grow from a parent
999 struct dst_entry dst;
1001 struct rt6_info rt6;
1003 struct dst_entry *route;
1004 struct dst_entry *child;
1005 struct dst_entry *path;
1006 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1007 int num_pols, num_xfrms;
1010 u32 route_mtu_cached;
1011 u32 child_mtu_cached;
1016 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1019 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
1020 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1025 return (struct dst_entry *) dst;
1028 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1031 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
1032 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1040 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1042 xdst->child = child;
1045 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1047 xfrm_pols_put(xdst->pols, xdst->num_pols);
1048 dst_release(xdst->route);
1049 if (likely(xdst->u.dst.xfrm))
1050 xfrm_state_put(xdst->u.dst.xfrm);
1054 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1056 struct xfrm_if_parms {
1057 int link; /* ifindex of underlying L2 interface */
1058 u32 if_id; /* interface identifyer */
1062 struct xfrm_if __rcu *next; /* next interface in list */
1063 struct net_device *dev; /* virtual device associated with interface */
1064 struct net *net; /* netns for packet i/o */
1065 struct xfrm_if_parms p; /* interface parms */
1067 struct gro_cells gro_cells;
1070 struct xfrm_offload {
1071 /* Output sequence number for replay protection on offloading. */
1078 #define SA_DELETE_REQ 1
1079 #define CRYPTO_DONE 2
1080 #define CRYPTO_NEXT_DONE 4
1081 #define CRYPTO_FALLBACK 8
1082 #define XFRM_GSO_SEGMENT 16
1084 #define XFRM_ESP_NO_TRAILER 64
1085 #define XFRM_DEV_RESUME 128
1086 #define XFRM_XMIT 256
1089 #define CRYPTO_SUCCESS 1
1090 #define CRYPTO_GENERIC_ERROR 2
1091 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1092 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1093 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1094 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1095 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1096 #define CRYPTO_INVALID_PROTOCOL 128
1106 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1107 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1110 static inline int secpath_exists(struct sk_buff *skb)
1113 return skb->sp != NULL;
1119 static inline struct sec_path *
1120 secpath_get(struct sec_path *sp)
1123 refcount_inc(&sp->refcnt);
1127 void __secpath_destroy(struct sec_path *sp);
1130 secpath_put(struct sec_path *sp)
1132 if (sp && refcount_dec_and_test(&sp->refcnt))
1133 __secpath_destroy(sp);
1136 struct sec_path *secpath_dup(struct sec_path *src);
1137 int secpath_set(struct sk_buff *skb);
1140 secpath_reset(struct sk_buff *skb)
1143 secpath_put(skb->sp);
1149 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1153 return addr->a4 == 0;
1155 return ipv6_addr_any(&addr->in6);
1161 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1163 return (tmpl->saddr.a4 &&
1164 tmpl->saddr.a4 != x->props.saddr.a4);
1168 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1170 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1171 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1175 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1179 return __xfrm4_state_addr_cmp(tmpl, x);
1181 return __xfrm6_state_addr_cmp(tmpl, x);
1187 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1188 unsigned short family);
1190 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1191 struct sk_buff *skb,
1192 unsigned int family, int reverse)
1194 struct net *net = dev_net(skb->dev);
1195 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1197 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1198 return __xfrm_policy_check(sk, ndir, skb, family);
1200 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1201 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1202 __xfrm_policy_check(sk, ndir, skb, family);
1205 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1207 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1210 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1212 return xfrm_policy_check(sk, dir, skb, AF_INET);
1215 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1217 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1220 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1221 struct sk_buff *skb)
1223 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1226 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1227 struct sk_buff *skb)
1229 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1232 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1233 unsigned int family, int reverse);
1235 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1236 unsigned int family)
1238 return __xfrm_decode_session(skb, fl, family, 0);
1241 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1243 unsigned int family)
1245 return __xfrm_decode_session(skb, fl, family, 1);
1248 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1250 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1252 struct net *net = dev_net(skb->dev);
1254 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1255 (skb_dst(skb)->flags & DST_NOXFRM) ||
1256 __xfrm_route_forward(skb, family);
1259 static inline int xfrm4_route_forward(struct sk_buff *skb)
1261 return xfrm_route_forward(skb, AF_INET);
1264 static inline int xfrm6_route_forward(struct sk_buff *skb)
1266 return xfrm_route_forward(skb, AF_INET6);
1269 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1271 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1273 sk->sk_policy[0] = NULL;
1274 sk->sk_policy[1] = NULL;
1275 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1276 return __xfrm_sk_clone_policy(sk, osk);
1280 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1282 static inline void xfrm_sk_free_policy(struct sock *sk)
1284 struct xfrm_policy *pol;
1286 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1287 if (unlikely(pol != NULL)) {
1288 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1289 sk->sk_policy[0] = NULL;
1291 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1292 if (unlikely(pol != NULL)) {
1293 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1294 sk->sk_policy[1] = NULL;
1300 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1301 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1302 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1303 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1304 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1308 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1312 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1316 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1318 unsigned int family)
1322 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1323 struct sk_buff *skb)
1327 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1328 struct sk_buff *skb)
1335 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1339 return (xfrm_address_t *)&fl->u.ip4.daddr;
1341 return (xfrm_address_t *)&fl->u.ip6.daddr;
1347 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1351 return (xfrm_address_t *)&fl->u.ip4.saddr;
1353 return (xfrm_address_t *)&fl->u.ip6.saddr;
1359 void xfrm_flowi_addr_get(const struct flowi *fl,
1360 xfrm_address_t *saddr, xfrm_address_t *daddr,
1361 unsigned short family)
1365 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1366 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1369 saddr->in6 = fl->u.ip6.saddr;
1370 daddr->in6 = fl->u.ip6.daddr;
1375 static __inline__ int
1376 __xfrm4_state_addr_check(const struct xfrm_state *x,
1377 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1379 if (daddr->a4 == x->id.daddr.a4 &&
1380 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1385 static __inline__ int
1386 __xfrm6_state_addr_check(const struct xfrm_state *x,
1387 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1389 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1390 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1391 ipv6_addr_any((struct in6_addr *)saddr) ||
1392 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1397 static __inline__ int
1398 xfrm_state_addr_check(const struct xfrm_state *x,
1399 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1400 unsigned short family)
1404 return __xfrm4_state_addr_check(x, daddr, saddr);
1406 return __xfrm6_state_addr_check(x, daddr, saddr);
1411 static __inline__ int
1412 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1413 unsigned short family)
1417 return __xfrm4_state_addr_check(x,
1418 (const xfrm_address_t *)&fl->u.ip4.daddr,
1419 (const xfrm_address_t *)&fl->u.ip4.saddr);
1421 return __xfrm6_state_addr_check(x,
1422 (const xfrm_address_t *)&fl->u.ip6.daddr,
1423 (const xfrm_address_t *)&fl->u.ip6.saddr);
1428 static inline int xfrm_state_kern(const struct xfrm_state *x)
1430 return atomic_read(&x->tunnel_users);
1433 static inline bool xfrm_id_proto_valid(u8 proto)
1439 #if IS_ENABLED(CONFIG_IPV6)
1440 case IPPROTO_ROUTING:
1441 case IPPROTO_DSTOPTS:
1449 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1450 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1452 return (!userproto || proto == userproto ||
1453 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1454 proto == IPPROTO_ESP ||
1455 proto == IPPROTO_COMP)));
1459 * xfrm algorithm information
1461 struct xfrm_algo_aead_info {
1466 struct xfrm_algo_auth_info {
1471 struct xfrm_algo_encr_info {
1477 struct xfrm_algo_comp_info {
1481 struct xfrm_algo_desc {
1485 u8 pfkey_supported:1;
1487 struct xfrm_algo_aead_info aead;
1488 struct xfrm_algo_auth_info auth;
1489 struct xfrm_algo_encr_info encr;
1490 struct xfrm_algo_comp_info comp;
1492 struct sadb_alg desc;
1495 /* XFRM protocol handlers. */
1496 struct xfrm4_protocol {
1497 int (*handler)(struct sk_buff *skb);
1498 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1500 int (*cb_handler)(struct sk_buff *skb, int err);
1501 int (*err_handler)(struct sk_buff *skb, u32 info);
1503 struct xfrm4_protocol __rcu *next;
1507 struct xfrm6_protocol {
1508 int (*handler)(struct sk_buff *skb);
1509 int (*cb_handler)(struct sk_buff *skb, int err);
1510 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1511 u8 type, u8 code, int offset, __be32 info);
1513 struct xfrm6_protocol __rcu *next;
1517 /* XFRM tunnel handlers. */
1518 struct xfrm_tunnel {
1519 int (*handler)(struct sk_buff *skb);
1520 int (*err_handler)(struct sk_buff *skb, u32 info);
1522 struct xfrm_tunnel __rcu *next;
1526 struct xfrm6_tunnel {
1527 int (*handler)(struct sk_buff *skb);
1528 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1529 u8 type, u8 code, int offset, __be32 info);
1530 struct xfrm6_tunnel __rcu *next;
1534 void xfrm_init(void);
1535 void xfrm4_init(void);
1536 int xfrm_state_init(struct net *net);
1537 void xfrm_state_fini(struct net *net);
1538 void xfrm4_state_init(void);
1539 void xfrm4_protocol_init(void);
1541 int xfrm6_init(void);
1542 void xfrm6_fini(void);
1543 int xfrm6_state_init(void);
1544 void xfrm6_state_fini(void);
1545 int xfrm6_protocol_init(void);
1546 void xfrm6_protocol_fini(void);
1548 static inline int xfrm6_init(void)
1552 static inline void xfrm6_fini(void)
1558 #ifdef CONFIG_XFRM_STATISTICS
1559 int xfrm_proc_init(struct net *net);
1560 void xfrm_proc_fini(struct net *net);
1563 int xfrm_sysctl_init(struct net *net);
1564 #ifdef CONFIG_SYSCTL
1565 void xfrm_sysctl_fini(struct net *net);
1567 static inline void xfrm_sysctl_fini(struct net *net)
1572 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1573 struct xfrm_address_filter *filter);
1574 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1575 int (*func)(struct xfrm_state *, int, void*), void *);
1576 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1577 struct xfrm_state *xfrm_state_alloc(struct net *net);
1578 void xfrm_state_free(struct xfrm_state *x);
1579 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1580 const xfrm_address_t *saddr,
1581 const struct flowi *fl,
1582 struct xfrm_tmpl *tmpl,
1583 struct xfrm_policy *pol, int *err,
1584 unsigned short family, u32 if_id);
1585 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1586 xfrm_address_t *daddr,
1587 xfrm_address_t *saddr,
1588 unsigned short family,
1589 u8 mode, u8 proto, u32 reqid);
1590 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1591 unsigned short family);
1592 int xfrm_state_check_expire(struct xfrm_state *x);
1593 void xfrm_state_insert(struct xfrm_state *x);
1594 int xfrm_state_add(struct xfrm_state *x);
1595 int xfrm_state_update(struct xfrm_state *x);
1596 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1597 const xfrm_address_t *daddr, __be32 spi,
1598 u8 proto, unsigned short family);
1599 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1600 const xfrm_address_t *daddr,
1601 const xfrm_address_t *saddr,
1603 unsigned short family);
1604 #ifdef CONFIG_XFRM_SUB_POLICY
1605 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1606 unsigned short family, struct net *net);
1607 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1608 unsigned short family);
1610 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1611 int n, unsigned short family, struct net *net)
1616 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1617 int n, unsigned short family)
1623 struct xfrmk_sadinfo {
1624 u32 sadhcnt; /* current hash bkts */
1625 u32 sadhmcnt; /* max allowed hash bkts */
1626 u32 sadcnt; /* current running count */
1629 struct xfrmk_spdinfo {
1640 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1641 int xfrm_state_delete(struct xfrm_state *x);
1642 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1643 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1644 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1645 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1646 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1647 int xfrm_init_replay(struct xfrm_state *x);
1648 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1649 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1650 int xfrm_init_state(struct xfrm_state *x);
1651 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1652 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1653 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1654 int xfrm_trans_queue(struct sk_buff *skb,
1655 int (*finish)(struct net *, struct sock *,
1657 int xfrm_output_resume(struct sk_buff *skb, int err);
1658 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1659 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1660 void xfrm_local_error(struct sk_buff *skb, int mtu);
1661 int xfrm4_extract_header(struct sk_buff *skb);
1662 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1663 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1665 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1666 int xfrm4_rcv(struct sk_buff *skb);
1667 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1669 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1671 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1672 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1673 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1674 return xfrm_input(skb, nexthdr, spi, 0);
1677 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1678 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1679 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1680 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1681 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1682 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1683 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1684 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1685 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1686 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1687 int xfrm6_extract_header(struct sk_buff *skb);
1688 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1689 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1691 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1692 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1693 int xfrm6_rcv(struct sk_buff *skb);
1694 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1695 xfrm_address_t *saddr, u8 proto);
1696 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1697 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1698 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1699 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1700 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1701 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1702 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1703 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1704 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1705 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1706 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1707 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1708 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1712 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1713 int xfrm_user_policy(struct sock *sk, int optname,
1714 u8 __user *optval, int optlen);
1716 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1718 return -ENOPROTOOPT;
1721 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1723 /* should not happen */
1729 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1730 const xfrm_address_t *saddr,
1731 const xfrm_address_t *daddr,
1732 int family, u32 mark);
1734 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1736 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1737 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1738 int (*func)(struct xfrm_policy *, int, int, void*),
1740 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1741 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1742 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1743 const struct xfrm_mark *mark,
1744 u32 if_id, u8 type, int dir,
1745 struct xfrm_selector *sel,
1746 struct xfrm_sec_ctx *ctx, int delete,
1748 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1749 const struct xfrm_mark *mark, u32 if_id,
1750 u8 type, int dir, u32 id, int delete,
1752 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1753 void xfrm_policy_hash_rebuild(struct net *net);
1754 u32 xfrm_get_acqseq(void);
1755 int verify_spi_info(u8 proto, u32 min, u32 max);
1756 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1757 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1758 u8 mode, u32 reqid, u32 if_id, u8 proto,
1759 const xfrm_address_t *daddr,
1760 const xfrm_address_t *saddr, int create,
1761 unsigned short family);
1762 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1764 #ifdef CONFIG_XFRM_MIGRATE
1765 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1766 const struct xfrm_migrate *m, int num_bundles,
1767 const struct xfrm_kmaddress *k,
1768 const struct xfrm_encap_tmpl *encap);
1769 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1771 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1772 struct xfrm_migrate *m,
1773 struct xfrm_encap_tmpl *encap);
1774 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1775 struct xfrm_migrate *m, int num_bundles,
1776 struct xfrm_kmaddress *k, struct net *net,
1777 struct xfrm_encap_tmpl *encap, u32 if_id);
1780 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1781 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1782 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1783 xfrm_address_t *addr);
1785 void xfrm_input_init(void);
1786 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1788 void xfrm_probe_algs(void);
1789 int xfrm_count_pfkey_auth_supported(void);
1790 int xfrm_count_pfkey_enc_supported(void);
1791 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1792 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1793 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1794 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1795 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1796 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1797 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1798 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1799 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1802 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1803 const xfrm_address_t *b)
1805 return ipv6_addr_equal((const struct in6_addr *)a,
1806 (const struct in6_addr *)b);
1809 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1810 const xfrm_address_t *b,
1816 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1818 return xfrm6_addr_equal(a, b);
1822 static inline int xfrm_policy_id2dir(u32 index)
1828 static inline int xfrm_aevent_is_on(struct net *net)
1834 nlsk = rcu_dereference(net->xfrm.nlsk);
1836 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1841 static inline int xfrm_acquire_is_on(struct net *net)
1847 nlsk = rcu_dereference(net->xfrm.nlsk);
1849 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1856 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1858 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1861 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1863 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1866 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1868 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1871 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1873 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1876 #ifdef CONFIG_XFRM_MIGRATE
1877 static inline int xfrm_replay_clone(struct xfrm_state *x,
1878 struct xfrm_state *orig)
1881 x->replay_esn = kmemdup(orig->replay_esn,
1882 xfrm_replay_state_esn_len(orig->replay_esn),
1886 x->preplay_esn = kmemdup(orig->preplay_esn,
1887 xfrm_replay_state_esn_len(orig->preplay_esn),
1889 if (!x->preplay_esn)
1895 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1897 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1901 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1903 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1906 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1908 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1911 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1914 for (i = 0; i < n; i++)
1915 xfrm_state_put(*(states + i));
1918 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1921 for (i = 0; i < n; i++)
1922 xfrm_state_delete(*(states + i));
1927 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1929 return skb->sp->xvec[skb->sp->len - 1];
1933 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1936 struct sec_path *sp = skb->sp;
1938 if (!sp || !sp->olen || sp->len != sp->olen)
1941 return &sp->ovec[sp->olen - 1];
1947 void __init xfrm_dev_init(void);
1949 #ifdef CONFIG_XFRM_OFFLOAD
1950 void xfrm_dev_resume(struct sk_buff *skb);
1951 void xfrm_dev_backlog(struct softnet_data *sd);
1952 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1953 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1954 struct xfrm_user_offload *xuo);
1955 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1957 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1959 struct xfrm_state_offload *xso = &x->xso;
1961 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1962 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1965 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1967 struct xfrm_state *x = dst->xfrm;
1968 struct xfrm_dst *xdst;
1970 if (!x || !x->type_offload)
1973 xdst = (struct xfrm_dst *) dst;
1974 if (!x->xso.offload_handle && !xdst->child->xfrm)
1976 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1983 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1985 struct xfrm_state_offload *xso = &x->xso;
1988 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1991 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1993 struct xfrm_state_offload *xso = &x->xso;
1994 struct net_device *dev = xso->dev;
1996 if (dev && dev->xfrmdev_ops) {
1997 if (dev->xfrmdev_ops->xdo_dev_state_free)
1998 dev->xfrmdev_ops->xdo_dev_state_free(x);
2004 static inline void xfrm_dev_resume(struct sk_buff *skb)
2008 static inline void xfrm_dev_backlog(struct softnet_data *sd)
2012 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2017 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
2022 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2026 static inline void xfrm_dev_state_free(struct xfrm_state *x)
2030 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2035 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2039 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2045 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2047 if (attrs[XFRMA_MARK])
2048 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2055 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2060 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2064 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2066 struct xfrm_mark *m = &x->props.smark;
2068 return (m->v & m->m) | (mark & ~m->m);
2071 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2076 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2080 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2081 unsigned int family)
2083 bool tunnel = false;
2087 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2091 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2095 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2100 #endif /* _NET_XFRM_H */