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>
18 #include <linux/sockptr.h>
23 #include <net/route.h>
25 #include <net/ip6_fib.h>
27 #include <net/gro_cells.h>
29 #include <linux/interrupt.h>
31 #ifdef CONFIG_XFRM_STATISTICS
35 #define XFRM_PROTO_ESP 50
36 #define XFRM_PROTO_AH 51
37 #define XFRM_PROTO_COMP 108
38 #define XFRM_PROTO_IPIP 4
39 #define XFRM_PROTO_IPV6 41
40 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
41 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
43 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
44 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
45 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
52 #ifdef CONFIG_XFRM_STATISTICS
53 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
55 #define XFRM_INC_STATS(net, field) ((void)(net))
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
73 Lookup is plain linear search until the first match with selector.
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 Bundles are cached at xrfm_policy struct (field ->bundles).
90 Resolution of xrfm_tmpl
91 -----------------------
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 struct xfrm_state_walk {
121 struct list_head all;
126 struct xfrm_address_filter *filter;
129 struct xfrm_state_offload {
130 struct net_device *dev;
131 struct net_device *real_dev;
132 unsigned long offload_handle;
133 unsigned int num_exthdrs;
143 /* Flags for xfrm_mode. */
145 XFRM_MODE_FLAG_TUNNEL = 1,
148 enum xfrm_replay_mode {
149 XFRM_REPLAY_MODE_LEGACY,
150 XFRM_REPLAY_MODE_BMP,
151 XFRM_REPLAY_MODE_ESN,
154 /* Full description of state of transformer. */
156 possible_net_t xs_net;
158 struct hlist_node gclist;
159 struct hlist_node bydst;
161 struct hlist_node bysrc;
162 struct hlist_node byspi;
163 struct hlist_node byseq;
169 struct xfrm_selector sel;
170 struct xfrm_mark mark;
176 /* Key manager bits */
177 struct xfrm_state_walk km;
179 /* Parameters of this state. */
184 u8 aalgo, ealgo, calgo;
187 xfrm_address_t saddr;
191 struct xfrm_mark smark;
194 struct xfrm_lifetime_cfg lft;
196 /* Data for transformer */
197 struct xfrm_algo_auth *aalg;
198 struct xfrm_algo *ealg;
199 struct xfrm_algo *calg;
200 struct xfrm_algo_aead *aead;
203 /* Data for encapsulator */
204 struct xfrm_encap_tmpl *encap;
205 struct sock __rcu *encap_sk;
207 /* Data for care-of address */
208 xfrm_address_t *coaddr;
210 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
211 struct xfrm_state *tunnel;
213 /* If a tunnel, number of users + 1 */
214 atomic_t tunnel_users;
216 /* State for replay detection */
217 struct xfrm_replay_state replay;
218 struct xfrm_replay_state_esn *replay_esn;
220 /* Replay detection state at the time we sent the last notification */
221 struct xfrm_replay_state preplay;
222 struct xfrm_replay_state_esn *preplay_esn;
224 /* The functions for replay detection. */
225 const struct xfrm_replay *repl;
227 /* replay detection mode */
228 enum xfrm_replay_mode repl_mode;
229 /* internal flag that only holds state for delayed aevent at the
234 /* Replay detection notification settings */
238 /* Replay detection notification timer */
239 struct timer_list rtimer;
242 struct xfrm_stats stats;
244 struct xfrm_lifetime_cur curlft;
245 struct hrtimer mtimer;
247 struct xfrm_state_offload xso;
249 /* used to fix curlft->add_time when changing date */
255 struct page_frag xfrag;
257 /* Reference to data common to all the instances of this
259 const struct xfrm_type *type;
260 struct xfrm_mode inner_mode;
261 struct xfrm_mode inner_mode_iaf;
262 struct xfrm_mode outer_mode;
264 const struct xfrm_type_offload *type_offload;
266 /* Security context */
267 struct xfrm_sec_ctx *security;
269 /* Private data of this transformer, format is opaque,
270 * interpreted by xfrm_type methods. */
274 static inline struct net *xs_net(struct xfrm_state *x)
276 return read_pnet(&x->xs_net);
279 /* xflags - make enum if more show up */
280 #define XFRM_TIME_DEFER 1
281 #define XFRM_SOFT_EXPIRE 2
292 /* callback structure passed from either netlink or pfkey */
309 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
313 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
314 unsigned short family);
317 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
318 void xfrm_if_unregister_cb(void);
323 struct xfrm_policy_afinfo {
324 struct dst_ops *dst_ops;
325 struct dst_entry *(*dst_lookup)(struct net *net,
327 const xfrm_address_t *saddr,
328 const xfrm_address_t *daddr,
330 int (*get_saddr)(struct net *net, int oif,
331 xfrm_address_t *saddr,
332 xfrm_address_t *daddr,
334 int (*fill_dst)(struct xfrm_dst *xdst,
335 struct net_device *dev,
336 const struct flowi *fl);
337 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
340 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
341 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
342 void km_policy_notify(struct xfrm_policy *xp, int dir,
343 const struct km_event *c);
344 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
347 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
348 struct xfrm_policy *pol);
349 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
350 int __xfrm_state_delete(struct xfrm_state *x);
352 struct xfrm_state_afinfo {
356 const struct xfrm_type_offload *type_offload_esp;
358 const struct xfrm_type *type_esp;
359 const struct xfrm_type *type_ipip;
360 const struct xfrm_type *type_ipip6;
361 const struct xfrm_type *type_comp;
362 const struct xfrm_type *type_ah;
363 const struct xfrm_type *type_routing;
364 const struct xfrm_type *type_dstopts;
366 int (*output)(struct net *net, struct sock *sk, 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 {
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);
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 *);
407 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
408 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
410 struct xfrm_type_offload {
411 struct module *owner;
413 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
414 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
415 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
418 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
419 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
421 static inline int xfrm_af2proto(unsigned int family)
433 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
435 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
436 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
437 return &x->inner_mode;
439 return &x->inner_mode_iaf;
443 /* id in template is interpreted as:
444 * daddr - destination of tunnel, may be zero for transport mode.
445 * spi - zero to acquire spi. Not zero if spi is static, then
446 * daddr must be fixed too.
447 * proto - AH/ESP/IPCOMP
451 /* Source address of tunnel. Ignored, if it is not a tunnel. */
452 xfrm_address_t saddr;
454 unsigned short encap_family;
458 /* Mode: transport, tunnel etc. */
461 /* Sharing mode: unique, this session only, this user only etc. */
464 /* May skip this transfomration if no SA is found */
467 /* Skip aalgos/ealgos/calgos checks. */
470 /* Bit mask of algos allowed for acquisition */
476 #define XFRM_MAX_DEPTH 6
477 #define XFRM_MAX_OFFLOAD_DEPTH 1
479 struct xfrm_policy_walk_entry {
480 struct list_head all;
484 struct xfrm_policy_walk {
485 struct xfrm_policy_walk_entry walk;
490 struct xfrm_policy_queue {
491 struct sk_buff_head hold_queue;
492 struct timer_list hold_timer;
493 unsigned long timeout;
497 possible_net_t xp_net;
498 struct hlist_node bydst;
499 struct hlist_node byidx;
501 /* This lock only affects elements except for entry. */
505 struct timer_list timer;
511 struct xfrm_mark mark;
512 struct xfrm_selector selector;
513 struct xfrm_lifetime_cfg lft;
514 struct xfrm_lifetime_cur curlft;
515 struct xfrm_policy_walk_entry walk;
516 struct xfrm_policy_queue polq;
523 struct xfrm_sec_ctx *security;
524 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
525 struct hlist_node bydst_inexact_list;
529 static inline struct net *xp_net(const struct xfrm_policy *xp)
531 return read_pnet(&xp->xp_net);
534 struct xfrm_kmaddress {
535 xfrm_address_t local;
536 xfrm_address_t remote;
541 struct xfrm_migrate {
542 xfrm_address_t old_daddr;
543 xfrm_address_t old_saddr;
544 xfrm_address_t new_daddr;
545 xfrm_address_t new_saddr;
554 #define XFRM_KM_TIMEOUT 30
556 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
557 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
559 /* default aevent timeout in units of 100ms */
560 #define XFRM_AE_ETIME 10
561 /* Async Event timer multiplier */
562 #define XFRM_AE_ETH_M 10
563 /* default seq threshold size */
564 #define XFRM_AE_SEQT_SIZE 2
567 struct list_head list;
568 int (*notify)(struct xfrm_state *x, const struct km_event *c);
569 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
570 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
571 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
572 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
573 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
574 int (*migrate)(const struct xfrm_selector *sel,
576 const struct xfrm_migrate *m,
578 const struct xfrm_kmaddress *k,
579 const struct xfrm_encap_tmpl *encap);
580 bool (*is_alive)(const struct km_event *c);
583 int xfrm_register_km(struct xfrm_mgr *km);
584 int xfrm_unregister_km(struct xfrm_mgr *km);
586 struct xfrm_tunnel_skb_cb {
588 struct inet_skb_parm h4;
589 struct inet6_skb_parm h6;
593 struct ip_tunnel *ip4;
598 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
601 * This structure is used for the duration where packets are being
602 * transformed by IPsec. As soon as the packet leaves IPsec the
603 * area beyond the generic IP part may be overwritten.
606 struct xfrm_tunnel_skb_cb header;
608 /* Sequence number for replay protection. */
621 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
624 * This structure is used by the afinfo prepare_input/prepare_output functions
625 * to transmit header information to the mode input/output functions.
627 struct xfrm_mode_skb_cb {
628 struct xfrm_tunnel_skb_cb header;
630 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
634 /* IP header length (excluding options or extension headers). */
637 /* TOS for IPv4, class for IPv6. */
640 /* TTL for IPv4, hop limitfor IPv6. */
643 /* Protocol for IPv4, NH for IPv6. */
646 /* Option length for IPv4, zero for IPv6. */
649 /* Used by IPv6 only, zero for IPv4. */
653 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
656 * This structure is used by the input processing to locate the SPI and
657 * related information.
659 struct xfrm_spi_skb_cb {
660 struct xfrm_tunnel_skb_cb header;
662 unsigned int daddroff;
667 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
669 #ifdef CONFIG_AUDITSYSCALL
670 static inline struct audit_buffer *xfrm_audit_start(const char *op)
672 struct audit_buffer *audit_buf = NULL;
674 if (audit_enabled == AUDIT_OFF)
676 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
677 AUDIT_MAC_IPSEC_EVENT);
678 if (audit_buf == NULL)
680 audit_log_format(audit_buf, "op=%s", op);
684 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
685 struct audit_buffer *audit_buf)
687 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
688 audit_get_loginuid(current) :
690 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
693 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
694 audit_log_task_context(audit_buf);
697 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
698 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
700 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
701 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
702 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
703 struct sk_buff *skb);
704 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
706 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
707 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
709 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
713 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
718 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
723 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
728 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
733 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
738 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
739 struct sk_buff *skb, __be32 net_seq)
743 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
748 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
749 __be32 net_spi, __be32 net_seq)
753 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
754 struct sk_buff *skb, u8 proto)
757 #endif /* CONFIG_AUDITSYSCALL */
759 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
761 if (likely(policy != NULL))
762 refcount_inc(&policy->refcnt);
765 void xfrm_policy_destroy(struct xfrm_policy *policy);
767 static inline void xfrm_pol_put(struct xfrm_policy *policy)
769 if (refcount_dec_and_test(&policy->refcnt))
770 xfrm_policy_destroy(policy);
773 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
776 for (i = npols - 1; i >= 0; --i)
777 xfrm_pol_put(pols[i]);
780 void __xfrm_state_destroy(struct xfrm_state *, bool);
782 static inline void __xfrm_state_put(struct xfrm_state *x)
784 refcount_dec(&x->refcnt);
787 static inline void xfrm_state_put(struct xfrm_state *x)
789 if (refcount_dec_and_test(&x->refcnt))
790 __xfrm_state_destroy(x, false);
793 static inline void xfrm_state_put_sync(struct xfrm_state *x)
795 if (refcount_dec_and_test(&x->refcnt))
796 __xfrm_state_destroy(x, true);
799 static inline void xfrm_state_hold(struct xfrm_state *x)
801 refcount_inc(&x->refcnt);
804 static inline bool addr_match(const void *token1, const void *token2,
805 unsigned int prefixlen)
807 const __be32 *a1 = token1;
808 const __be32 *a2 = token2;
812 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
813 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
816 if (memcmp(a1, a2, pdw << 2))
822 mask = htonl((0xffffffff) << (32 - pbi));
824 if ((a1[pdw] ^ a2[pdw]) & mask)
831 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
833 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
834 if (sizeof(long) == 4 && prefixlen == 0)
836 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
840 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
843 switch(fl->flowi_proto) {
846 case IPPROTO_UDPLITE:
848 port = uli->ports.sport;
852 port = htons(uli->icmpt.type);
855 port = htons(uli->mht.type);
858 port = htons(ntohl(uli->gre_key) >> 16);
867 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
870 switch(fl->flowi_proto) {
873 case IPPROTO_UDPLITE:
875 port = uli->ports.dport;
879 port = htons(uli->icmpt.code);
882 port = htons(ntohl(uli->gre_key) & 0xffff);
890 bool xfrm_selector_match(const struct xfrm_selector *sel,
891 const struct flowi *fl, unsigned short family);
893 #ifdef CONFIG_SECURITY_NETWORK_XFRM
894 /* If neither has a context --> match
895 * Otherwise, both must have a context and the sids, doi, alg must match
897 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
899 return ((!s1 && !s2) ||
901 (s1->ctx_sid == s2->ctx_sid) &&
902 (s1->ctx_doi == s2->ctx_doi) &&
903 (s1->ctx_alg == s2->ctx_alg)));
906 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
912 /* A struct encoding bundle of transformations to apply to some set of flow.
914 * xdst->child points to the next element of bundle.
915 * dst->xfrm points to an instanse of transformer.
917 * Due to unfortunate limitations of current routing cache, which we
918 * have no time to fix, it mirrors struct rtable and bound to the same
919 * routing key, including saddr,daddr. However, we can have many of
920 * bundles differing by session id. All the bundles grow from a parent
925 struct dst_entry dst;
929 struct dst_entry *route;
930 struct dst_entry *child;
931 struct dst_entry *path;
932 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
933 int num_pols, num_xfrms;
936 u32 route_mtu_cached;
937 u32 child_mtu_cached;
942 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
945 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
946 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
951 return (struct dst_entry *) dst;
954 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
957 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
958 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
966 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
971 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
973 xfrm_pols_put(xdst->pols, xdst->num_pols);
974 dst_release(xdst->route);
975 if (likely(xdst->u.dst.xfrm))
976 xfrm_state_put(xdst->u.dst.xfrm);
980 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
982 struct xfrm_if_parms {
983 int link; /* ifindex of underlying L2 interface */
984 u32 if_id; /* interface identifyer */
988 struct xfrm_if __rcu *next; /* next interface in list */
989 struct net_device *dev; /* virtual device associated with interface */
990 struct net *net; /* netns for packet i/o */
991 struct xfrm_if_parms p; /* interface parms */
993 struct gro_cells gro_cells;
996 struct xfrm_offload {
997 /* Output sequence number for replay protection on offloading. */
1004 #define SA_DELETE_REQ 1
1005 #define CRYPTO_DONE 2
1006 #define CRYPTO_NEXT_DONE 4
1007 #define CRYPTO_FALLBACK 8
1008 #define XFRM_GSO_SEGMENT 16
1010 #define XFRM_ESP_NO_TRAILER 64
1011 #define XFRM_DEV_RESUME 128
1012 #define XFRM_XMIT 256
1015 #define CRYPTO_SUCCESS 1
1016 #define CRYPTO_GENERIC_ERROR 2
1017 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1018 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1019 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1020 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1021 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1022 #define CRYPTO_INVALID_PROTOCOL 128
1031 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1032 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1035 struct sec_path *secpath_set(struct sk_buff *skb);
1038 secpath_reset(struct sk_buff *skb)
1041 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1046 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1050 return addr->a4 == 0;
1052 return ipv6_addr_any(&addr->in6);
1058 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1060 return (tmpl->saddr.a4 &&
1061 tmpl->saddr.a4 != x->props.saddr.a4);
1065 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1067 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1068 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1072 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1076 return __xfrm4_state_addr_cmp(tmpl, x);
1078 return __xfrm6_state_addr_cmp(tmpl, x);
1084 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1085 unsigned short family);
1087 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1088 struct sk_buff *skb,
1089 unsigned int family, int reverse)
1091 struct net *net = dev_net(skb->dev);
1092 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1094 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1095 return __xfrm_policy_check(sk, ndir, skb, family);
1097 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1098 (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) ||
1099 __xfrm_policy_check(sk, ndir, skb, family);
1102 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1104 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1107 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1109 return xfrm_policy_check(sk, dir, skb, AF_INET);
1112 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1114 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1117 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1118 struct sk_buff *skb)
1120 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1123 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1124 struct sk_buff *skb)
1126 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1129 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1130 unsigned int family, int reverse);
1132 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1133 unsigned int family)
1135 return __xfrm_decode_session(skb, fl, family, 0);
1138 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1140 unsigned int family)
1142 return __xfrm_decode_session(skb, fl, family, 1);
1145 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1147 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1149 struct net *net = dev_net(skb->dev);
1151 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1152 (skb_dst(skb)->flags & DST_NOXFRM) ||
1153 __xfrm_route_forward(skb, family);
1156 static inline int xfrm4_route_forward(struct sk_buff *skb)
1158 return xfrm_route_forward(skb, AF_INET);
1161 static inline int xfrm6_route_forward(struct sk_buff *skb)
1163 return xfrm_route_forward(skb, AF_INET6);
1166 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1168 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1170 sk->sk_policy[0] = NULL;
1171 sk->sk_policy[1] = NULL;
1172 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1173 return __xfrm_sk_clone_policy(sk, osk);
1177 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1179 static inline void xfrm_sk_free_policy(struct sock *sk)
1181 struct xfrm_policy *pol;
1183 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1184 if (unlikely(pol != NULL)) {
1185 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1186 sk->sk_policy[0] = NULL;
1188 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1189 if (unlikely(pol != NULL)) {
1190 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1191 sk->sk_policy[1] = NULL;
1197 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1198 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1199 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1200 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1201 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1205 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1209 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1213 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1215 unsigned int family)
1219 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1220 struct sk_buff *skb)
1224 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1225 struct sk_buff *skb)
1232 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1236 return (xfrm_address_t *)&fl->u.ip4.daddr;
1238 return (xfrm_address_t *)&fl->u.ip6.daddr;
1244 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1248 return (xfrm_address_t *)&fl->u.ip4.saddr;
1250 return (xfrm_address_t *)&fl->u.ip6.saddr;
1256 void xfrm_flowi_addr_get(const struct flowi *fl,
1257 xfrm_address_t *saddr, xfrm_address_t *daddr,
1258 unsigned short family)
1262 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1263 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1266 saddr->in6 = fl->u.ip6.saddr;
1267 daddr->in6 = fl->u.ip6.daddr;
1272 static __inline__ int
1273 __xfrm4_state_addr_check(const struct xfrm_state *x,
1274 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1276 if (daddr->a4 == x->id.daddr.a4 &&
1277 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1282 static __inline__ int
1283 __xfrm6_state_addr_check(const struct xfrm_state *x,
1284 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1286 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1287 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1288 ipv6_addr_any((struct in6_addr *)saddr) ||
1289 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1294 static __inline__ int
1295 xfrm_state_addr_check(const struct xfrm_state *x,
1296 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1297 unsigned short family)
1301 return __xfrm4_state_addr_check(x, daddr, saddr);
1303 return __xfrm6_state_addr_check(x, daddr, saddr);
1308 static __inline__ int
1309 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1310 unsigned short family)
1314 return __xfrm4_state_addr_check(x,
1315 (const xfrm_address_t *)&fl->u.ip4.daddr,
1316 (const xfrm_address_t *)&fl->u.ip4.saddr);
1318 return __xfrm6_state_addr_check(x,
1319 (const xfrm_address_t *)&fl->u.ip6.daddr,
1320 (const xfrm_address_t *)&fl->u.ip6.saddr);
1325 static inline int xfrm_state_kern(const struct xfrm_state *x)
1327 return atomic_read(&x->tunnel_users);
1330 static inline bool xfrm_id_proto_valid(u8 proto)
1336 #if IS_ENABLED(CONFIG_IPV6)
1337 case IPPROTO_ROUTING:
1338 case IPPROTO_DSTOPTS:
1346 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1347 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1349 return (!userproto || proto == userproto ||
1350 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1351 proto == IPPROTO_ESP ||
1352 proto == IPPROTO_COMP)));
1356 * xfrm algorithm information
1358 struct xfrm_algo_aead_info {
1363 struct xfrm_algo_auth_info {
1368 struct xfrm_algo_encr_info {
1374 struct xfrm_algo_comp_info {
1378 struct xfrm_algo_desc {
1382 u8 pfkey_supported:1;
1384 struct xfrm_algo_aead_info aead;
1385 struct xfrm_algo_auth_info auth;
1386 struct xfrm_algo_encr_info encr;
1387 struct xfrm_algo_comp_info comp;
1389 struct sadb_alg desc;
1392 /* XFRM protocol handlers. */
1393 struct xfrm4_protocol {
1394 int (*handler)(struct sk_buff *skb);
1395 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1397 int (*cb_handler)(struct sk_buff *skb, int err);
1398 int (*err_handler)(struct sk_buff *skb, u32 info);
1400 struct xfrm4_protocol __rcu *next;
1404 struct xfrm6_protocol {
1405 int (*handler)(struct sk_buff *skb);
1406 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1408 int (*cb_handler)(struct sk_buff *skb, int err);
1409 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1410 u8 type, u8 code, int offset, __be32 info);
1412 struct xfrm6_protocol __rcu *next;
1416 /* XFRM tunnel handlers. */
1417 struct xfrm_tunnel {
1418 int (*handler)(struct sk_buff *skb);
1419 int (*cb_handler)(struct sk_buff *skb, int err);
1420 int (*err_handler)(struct sk_buff *skb, u32 info);
1422 struct xfrm_tunnel __rcu *next;
1426 struct xfrm6_tunnel {
1427 int (*handler)(struct sk_buff *skb);
1428 int (*cb_handler)(struct sk_buff *skb, int err);
1429 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1430 u8 type, u8 code, int offset, __be32 info);
1431 struct xfrm6_tunnel __rcu *next;
1435 void xfrm_init(void);
1436 void xfrm4_init(void);
1437 int xfrm_state_init(struct net *net);
1438 void xfrm_state_fini(struct net *net);
1439 void xfrm4_state_init(void);
1440 void xfrm4_protocol_init(void);
1442 int xfrm6_init(void);
1443 void xfrm6_fini(void);
1444 int xfrm6_state_init(void);
1445 void xfrm6_state_fini(void);
1446 int xfrm6_protocol_init(void);
1447 void xfrm6_protocol_fini(void);
1449 static inline int xfrm6_init(void)
1453 static inline void xfrm6_fini(void)
1459 #ifdef CONFIG_XFRM_STATISTICS
1460 int xfrm_proc_init(struct net *net);
1461 void xfrm_proc_fini(struct net *net);
1464 int xfrm_sysctl_init(struct net *net);
1465 #ifdef CONFIG_SYSCTL
1466 void xfrm_sysctl_fini(struct net *net);
1468 static inline void xfrm_sysctl_fini(struct net *net)
1473 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1474 struct xfrm_address_filter *filter);
1475 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1476 int (*func)(struct xfrm_state *, int, void*), void *);
1477 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1478 struct xfrm_state *xfrm_state_alloc(struct net *net);
1479 void xfrm_state_free(struct xfrm_state *x);
1480 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1481 const xfrm_address_t *saddr,
1482 const struct flowi *fl,
1483 struct xfrm_tmpl *tmpl,
1484 struct xfrm_policy *pol, int *err,
1485 unsigned short family, u32 if_id);
1486 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1487 xfrm_address_t *daddr,
1488 xfrm_address_t *saddr,
1489 unsigned short family,
1490 u8 mode, u8 proto, u32 reqid);
1491 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1492 unsigned short family);
1493 int xfrm_state_check_expire(struct xfrm_state *x);
1494 void xfrm_state_insert(struct xfrm_state *x);
1495 int xfrm_state_add(struct xfrm_state *x);
1496 int xfrm_state_update(struct xfrm_state *x);
1497 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1498 const xfrm_address_t *daddr, __be32 spi,
1499 u8 proto, unsigned short family);
1500 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1501 const xfrm_address_t *daddr,
1502 const xfrm_address_t *saddr,
1504 unsigned short family);
1505 #ifdef CONFIG_XFRM_SUB_POLICY
1506 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1507 unsigned short family);
1508 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1509 unsigned short family);
1511 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1512 int n, unsigned short family)
1516 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1517 int n, unsigned short family)
1522 struct xfrmk_sadinfo {
1523 u32 sadhcnt; /* current hash bkts */
1524 u32 sadhmcnt; /* max allowed hash bkts */
1525 u32 sadcnt; /* current running count */
1528 struct xfrmk_spdinfo {
1539 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1540 int xfrm_state_delete(struct xfrm_state *x);
1541 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1542 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1543 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1544 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1545 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1546 int xfrm_init_replay(struct xfrm_state *x);
1547 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1548 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1549 int xfrm_init_state(struct xfrm_state *x);
1550 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1551 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1552 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1553 int (*finish)(struct net *, struct sock *,
1555 int xfrm_trans_queue(struct sk_buff *skb,
1556 int (*finish)(struct net *, struct sock *,
1558 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1559 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1561 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1562 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1565 void xfrm_local_error(struct sk_buff *skb, int mtu);
1566 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1567 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1569 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1570 int xfrm4_rcv(struct sk_buff *skb);
1571 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1573 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1575 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1576 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1577 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1578 return xfrm_input(skb, nexthdr, spi, 0);
1581 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1582 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1583 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1584 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1585 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1586 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1587 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1588 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1590 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1592 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1593 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1594 int xfrm6_rcv(struct sk_buff *skb);
1595 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1596 xfrm_address_t *saddr, u8 proto);
1597 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1598 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1599 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1600 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1601 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1602 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1603 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1604 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1607 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1608 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1609 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1610 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1613 static inline int xfrm_user_policy(struct sock *sk, int optname,
1614 sockptr_t optval, int optlen)
1616 return -ENOPROTOOPT;
1620 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1621 const xfrm_address_t *saddr,
1622 const xfrm_address_t *daddr,
1623 int family, u32 mark);
1625 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1627 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1628 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1629 int (*func)(struct xfrm_policy *, int, int, void*),
1631 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1632 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1633 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1634 const struct xfrm_mark *mark,
1635 u32 if_id, u8 type, int dir,
1636 struct xfrm_selector *sel,
1637 struct xfrm_sec_ctx *ctx, int delete,
1639 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1640 const struct xfrm_mark *mark, u32 if_id,
1641 u8 type, int dir, u32 id, int delete,
1643 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1644 void xfrm_policy_hash_rebuild(struct net *net);
1645 u32 xfrm_get_acqseq(void);
1646 int verify_spi_info(u8 proto, u32 min, u32 max);
1647 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1648 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1649 u8 mode, u32 reqid, u32 if_id, u8 proto,
1650 const xfrm_address_t *daddr,
1651 const xfrm_address_t *saddr, int create,
1652 unsigned short family);
1653 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1655 #ifdef CONFIG_XFRM_MIGRATE
1656 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1657 const struct xfrm_migrate *m, int num_bundles,
1658 const struct xfrm_kmaddress *k,
1659 const struct xfrm_encap_tmpl *encap);
1660 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1661 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1662 struct xfrm_migrate *m,
1663 struct xfrm_encap_tmpl *encap);
1664 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1665 struct xfrm_migrate *m, int num_bundles,
1666 struct xfrm_kmaddress *k, struct net *net,
1667 struct xfrm_encap_tmpl *encap);
1670 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1671 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1672 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1673 xfrm_address_t *addr);
1675 void xfrm_input_init(void);
1676 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1678 void xfrm_probe_algs(void);
1679 int xfrm_count_pfkey_auth_supported(void);
1680 int xfrm_count_pfkey_enc_supported(void);
1681 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1682 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1683 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1684 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1685 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1686 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1687 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1688 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1689 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1692 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1693 const xfrm_address_t *b)
1695 return ipv6_addr_equal((const struct in6_addr *)a,
1696 (const struct in6_addr *)b);
1699 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1700 const xfrm_address_t *b,
1706 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1708 return xfrm6_addr_equal(a, b);
1712 static inline int xfrm_policy_id2dir(u32 index)
1718 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1719 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1720 void xfrm_replay_notify(struct xfrm_state *x, int event);
1721 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1723 static inline int xfrm_aevent_is_on(struct net *net)
1729 nlsk = rcu_dereference(net->xfrm.nlsk);
1731 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1736 static inline int xfrm_acquire_is_on(struct net *net)
1742 nlsk = rcu_dereference(net->xfrm.nlsk);
1744 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1751 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1753 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1756 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1758 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1761 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1763 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1766 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1768 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1771 #ifdef CONFIG_XFRM_MIGRATE
1772 static inline int xfrm_replay_clone(struct xfrm_state *x,
1773 struct xfrm_state *orig)
1776 x->replay_esn = kmemdup(orig->replay_esn,
1777 xfrm_replay_state_esn_len(orig->replay_esn),
1781 x->preplay_esn = kmemdup(orig->preplay_esn,
1782 xfrm_replay_state_esn_len(orig->preplay_esn),
1784 if (!x->preplay_esn)
1790 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1792 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1796 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1798 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1801 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1803 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1806 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1809 for (i = 0; i < n; i++)
1810 xfrm_state_put(*(states + i));
1813 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1816 for (i = 0; i < n; i++)
1817 xfrm_state_delete(*(states + i));
1822 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1824 struct sec_path *sp = skb_sec_path(skb);
1826 return sp->xvec[sp->len - 1];
1830 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1833 struct sec_path *sp = skb_sec_path(skb);
1835 if (!sp || !sp->olen || sp->len != sp->olen)
1838 return &sp->ovec[sp->olen - 1];
1844 void __init xfrm_dev_init(void);
1846 #ifdef CONFIG_XFRM_OFFLOAD
1847 void xfrm_dev_resume(struct sk_buff *skb);
1848 void xfrm_dev_backlog(struct softnet_data *sd);
1849 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1850 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1851 struct xfrm_user_offload *xuo);
1852 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1854 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1856 struct xfrm_state_offload *xso = &x->xso;
1858 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1859 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1862 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1864 struct xfrm_state *x = dst->xfrm;
1865 struct xfrm_dst *xdst;
1867 if (!x || !x->type_offload)
1870 xdst = (struct xfrm_dst *) dst;
1871 if (!x->xso.offload_handle && !xdst->child->xfrm)
1873 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1880 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1882 struct xfrm_state_offload *xso = &x->xso;
1885 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1888 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1890 struct xfrm_state_offload *xso = &x->xso;
1891 struct net_device *dev = xso->dev;
1893 if (dev && dev->xfrmdev_ops) {
1894 if (dev->xfrmdev_ops->xdo_dev_state_free)
1895 dev->xfrmdev_ops->xdo_dev_state_free(x);
1901 static inline void xfrm_dev_resume(struct sk_buff *skb)
1905 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1909 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1914 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1919 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1923 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1927 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1932 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1936 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1942 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1944 if (attrs[XFRMA_MARK])
1945 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1952 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1957 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1961 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1963 struct xfrm_mark *m = &x->props.smark;
1965 return (m->v & m->m) | (mark & ~m->m);
1968 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1973 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1977 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1978 unsigned int family)
1980 bool tunnel = false;
1984 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1988 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1992 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1998 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
1999 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2001 struct xfrm_translator {
2002 /* Allocate frag_list and put compat translation there */
2003 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2005 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2006 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2007 int maxtype, const struct nla_policy *policy,
2008 struct netlink_ext_ack *extack);
2010 /* Translate 32-bit user_policy from sockptr */
2011 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2013 struct module *owner;
2016 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2017 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2018 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2019 extern struct xfrm_translator *xfrm_get_translator(void);
2020 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2022 static inline struct xfrm_translator *xfrm_get_translator(void)
2026 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2031 #if IS_ENABLED(CONFIG_IPV6)
2032 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2036 if (!sk || sk->sk_family != AF_INET6)
2039 proto = sk->sk_protocol;
2040 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2041 return inet6_sk(sk)->dontfrag;
2046 #endif /* _NET_XFRM_H */