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;
130 XFRM_DEV_OFFLOAD_IN = 1,
131 XFRM_DEV_OFFLOAD_OUT,
134 struct xfrm_dev_offload {
135 struct net_device *dev;
136 netdevice_tracker dev_tracker;
137 struct net_device *real_dev;
138 unsigned long offload_handle;
148 /* Flags for xfrm_mode. */
150 XFRM_MODE_FLAG_TUNNEL = 1,
153 enum xfrm_replay_mode {
154 XFRM_REPLAY_MODE_LEGACY,
155 XFRM_REPLAY_MODE_BMP,
156 XFRM_REPLAY_MODE_ESN,
159 /* Full description of state of transformer. */
161 possible_net_t xs_net;
163 struct hlist_node gclist;
164 struct hlist_node bydst;
166 struct hlist_node bysrc;
167 struct hlist_node byspi;
168 struct hlist_node byseq;
174 struct xfrm_selector sel;
175 struct xfrm_mark mark;
181 /* Key manager bits */
182 struct xfrm_state_walk km;
184 /* Parameters of this state. */
189 u8 aalgo, ealgo, calgo;
192 xfrm_address_t saddr;
196 struct xfrm_mark smark;
199 struct xfrm_lifetime_cfg lft;
201 /* Data for transformer */
202 struct xfrm_algo_auth *aalg;
203 struct xfrm_algo *ealg;
204 struct xfrm_algo *calg;
205 struct xfrm_algo_aead *aead;
208 /* mapping change rate limiting */
209 __be16 new_mapping_sport;
210 u32 new_mapping; /* seconds */
211 u32 mapping_maxage; /* seconds for input SA */
213 /* Data for encapsulator */
214 struct xfrm_encap_tmpl *encap;
215 struct sock __rcu *encap_sk;
217 /* Data for care-of address */
218 xfrm_address_t *coaddr;
220 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
221 struct xfrm_state *tunnel;
223 /* If a tunnel, number of users + 1 */
224 atomic_t tunnel_users;
226 /* State for replay detection */
227 struct xfrm_replay_state replay;
228 struct xfrm_replay_state_esn *replay_esn;
230 /* Replay detection state at the time we sent the last notification */
231 struct xfrm_replay_state preplay;
232 struct xfrm_replay_state_esn *preplay_esn;
234 /* replay detection mode */
235 enum xfrm_replay_mode repl_mode;
236 /* internal flag that only holds state for delayed aevent at the
241 /* Replay detection notification settings */
245 /* Replay detection notification timer */
246 struct timer_list rtimer;
249 struct xfrm_stats stats;
251 struct xfrm_lifetime_cur curlft;
252 struct hrtimer mtimer;
254 struct xfrm_dev_offload xso;
256 /* used to fix curlft->add_time when changing date */
262 struct page_frag xfrag;
264 /* Reference to data common to all the instances of this
266 const struct xfrm_type *type;
267 struct xfrm_mode inner_mode;
268 struct xfrm_mode inner_mode_iaf;
269 struct xfrm_mode outer_mode;
271 const struct xfrm_type_offload *type_offload;
273 /* Security context */
274 struct xfrm_sec_ctx *security;
276 /* Private data of this transformer, format is opaque,
277 * interpreted by xfrm_type methods. */
281 static inline struct net *xs_net(struct xfrm_state *x)
283 return read_pnet(&x->xs_net);
286 /* xflags - make enum if more show up */
287 #define XFRM_TIME_DEFER 1
288 #define XFRM_SOFT_EXPIRE 2
299 /* callback structure passed from either netlink or pfkey */
315 struct xfrm_if_decode_session_result {
321 bool (*decode_session)(struct sk_buff *skb,
322 unsigned short family,
323 struct xfrm_if_decode_session_result *res);
326 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
327 void xfrm_if_unregister_cb(void);
332 struct xfrm_policy_afinfo {
333 struct dst_ops *dst_ops;
334 struct dst_entry *(*dst_lookup)(struct net *net,
336 const xfrm_address_t *saddr,
337 const xfrm_address_t *daddr,
339 int (*get_saddr)(struct net *net, int oif,
340 xfrm_address_t *saddr,
341 xfrm_address_t *daddr,
343 int (*fill_dst)(struct xfrm_dst *xdst,
344 struct net_device *dev,
345 const struct flowi *fl);
346 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
349 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
350 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
351 void km_policy_notify(struct xfrm_policy *xp, int dir,
352 const struct km_event *c);
353 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
356 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
357 struct xfrm_policy *pol);
358 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
359 int __xfrm_state_delete(struct xfrm_state *x);
361 struct xfrm_state_afinfo {
365 const struct xfrm_type_offload *type_offload_esp;
367 const struct xfrm_type *type_esp;
368 const struct xfrm_type *type_ipip;
369 const struct xfrm_type *type_ipip6;
370 const struct xfrm_type *type_comp;
371 const struct xfrm_type *type_ah;
372 const struct xfrm_type *type_routing;
373 const struct xfrm_type *type_dstopts;
375 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
376 int (*transport_finish)(struct sk_buff *skb,
378 void (*local_error)(struct sk_buff *skb, u32 mtu);
381 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
382 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
383 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
384 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
386 struct xfrm_input_afinfo {
389 int (*callback)(struct sk_buff *skb, u8 protocol,
393 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
394 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
396 void xfrm_flush_gc(void);
397 void xfrm_state_delete_tunnel(struct xfrm_state *x);
400 struct module *owner;
403 #define XFRM_TYPE_NON_FRAGMENT 1
404 #define XFRM_TYPE_REPLAY_PROT 2
405 #define XFRM_TYPE_LOCAL_COADDR 4
406 #define XFRM_TYPE_REMOTE_COADDR 8
408 int (*init_state)(struct xfrm_state *x,
409 struct netlink_ext_ack *extack);
410 void (*destructor)(struct xfrm_state *);
411 int (*input)(struct xfrm_state *, struct sk_buff *skb);
412 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
413 int (*reject)(struct xfrm_state *, struct sk_buff *,
414 const struct flowi *);
417 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
418 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
420 struct xfrm_type_offload {
421 struct module *owner;
423 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
424 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
425 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
428 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
429 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
431 static inline int xfrm_af2proto(unsigned int family)
443 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
445 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
446 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
447 return &x->inner_mode;
449 return &x->inner_mode_iaf;
453 /* id in template is interpreted as:
454 * daddr - destination of tunnel, may be zero for transport mode.
455 * spi - zero to acquire spi. Not zero if spi is static, then
456 * daddr must be fixed too.
457 * proto - AH/ESP/IPCOMP
461 /* Source address of tunnel. Ignored, if it is not a tunnel. */
462 xfrm_address_t saddr;
464 unsigned short encap_family;
468 /* Mode: transport, tunnel etc. */
471 /* Sharing mode: unique, this session only, this user only etc. */
474 /* May skip this transfomration if no SA is found */
477 /* Skip aalgos/ealgos/calgos checks. */
480 /* Bit mask of algos allowed for acquisition */
486 #define XFRM_MAX_DEPTH 6
487 #define XFRM_MAX_OFFLOAD_DEPTH 1
489 struct xfrm_policy_walk_entry {
490 struct list_head all;
494 struct xfrm_policy_walk {
495 struct xfrm_policy_walk_entry walk;
500 struct xfrm_policy_queue {
501 struct sk_buff_head hold_queue;
502 struct timer_list hold_timer;
503 unsigned long timeout;
507 possible_net_t xp_net;
508 struct hlist_node bydst;
509 struct hlist_node byidx;
511 /* This lock only affects elements except for entry. */
515 struct timer_list timer;
521 struct xfrm_mark mark;
522 struct xfrm_selector selector;
523 struct xfrm_lifetime_cfg lft;
524 struct xfrm_lifetime_cur curlft;
525 struct xfrm_policy_walk_entry walk;
526 struct xfrm_policy_queue polq;
533 struct xfrm_sec_ctx *security;
534 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
535 struct hlist_node bydst_inexact_list;
539 static inline struct net *xp_net(const struct xfrm_policy *xp)
541 return read_pnet(&xp->xp_net);
544 struct xfrm_kmaddress {
545 xfrm_address_t local;
546 xfrm_address_t remote;
551 struct xfrm_migrate {
552 xfrm_address_t old_daddr;
553 xfrm_address_t old_saddr;
554 xfrm_address_t new_daddr;
555 xfrm_address_t new_saddr;
564 #define XFRM_KM_TIMEOUT 30
566 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
567 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
569 /* default aevent timeout in units of 100ms */
570 #define XFRM_AE_ETIME 10
571 /* Async Event timer multiplier */
572 #define XFRM_AE_ETH_M 10
573 /* default seq threshold size */
574 #define XFRM_AE_SEQT_SIZE 2
577 struct list_head list;
578 int (*notify)(struct xfrm_state *x, const struct km_event *c);
579 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
580 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
581 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
582 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
583 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
584 int (*migrate)(const struct xfrm_selector *sel,
586 const struct xfrm_migrate *m,
588 const struct xfrm_kmaddress *k,
589 const struct xfrm_encap_tmpl *encap);
590 bool (*is_alive)(const struct km_event *c);
593 void xfrm_register_km(struct xfrm_mgr *km);
594 void xfrm_unregister_km(struct xfrm_mgr *km);
596 struct xfrm_tunnel_skb_cb {
598 struct inet_skb_parm h4;
599 struct inet6_skb_parm h6;
603 struct ip_tunnel *ip4;
608 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
611 * This structure is used for the duration where packets are being
612 * transformed by IPsec. As soon as the packet leaves IPsec the
613 * area beyond the generic IP part may be overwritten.
616 struct xfrm_tunnel_skb_cb header;
618 /* Sequence number for replay protection. */
631 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
634 * This structure is used by the afinfo prepare_input/prepare_output functions
635 * to transmit header information to the mode input/output functions.
637 struct xfrm_mode_skb_cb {
638 struct xfrm_tunnel_skb_cb header;
640 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
644 /* IP header length (excluding options or extension headers). */
647 /* TOS for IPv4, class for IPv6. */
650 /* TTL for IPv4, hop limitfor IPv6. */
653 /* Protocol for IPv4, NH for IPv6. */
656 /* Option length for IPv4, zero for IPv6. */
659 /* Used by IPv6 only, zero for IPv4. */
663 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
666 * This structure is used by the input processing to locate the SPI and
667 * related information.
669 struct xfrm_spi_skb_cb {
670 struct xfrm_tunnel_skb_cb header;
672 unsigned int daddroff;
677 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
679 #ifdef CONFIG_AUDITSYSCALL
680 static inline struct audit_buffer *xfrm_audit_start(const char *op)
682 struct audit_buffer *audit_buf = NULL;
684 if (audit_enabled == AUDIT_OFF)
686 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
687 AUDIT_MAC_IPSEC_EVENT);
688 if (audit_buf == NULL)
690 audit_log_format(audit_buf, "op=%s", op);
694 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
695 struct audit_buffer *audit_buf)
697 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
698 audit_get_loginuid(current) :
700 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
703 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
704 audit_log_task_context(audit_buf);
707 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
708 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
710 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
711 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
712 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
713 struct sk_buff *skb);
714 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
716 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
717 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
719 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
723 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
728 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
733 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
738 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
743 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
748 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
749 struct sk_buff *skb, __be32 net_seq)
753 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
758 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
759 __be32 net_spi, __be32 net_seq)
763 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
764 struct sk_buff *skb, u8 proto)
767 #endif /* CONFIG_AUDITSYSCALL */
769 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
771 if (likely(policy != NULL))
772 refcount_inc(&policy->refcnt);
775 void xfrm_policy_destroy(struct xfrm_policy *policy);
777 static inline void xfrm_pol_put(struct xfrm_policy *policy)
779 if (refcount_dec_and_test(&policy->refcnt))
780 xfrm_policy_destroy(policy);
783 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
786 for (i = npols - 1; i >= 0; --i)
787 xfrm_pol_put(pols[i]);
790 void __xfrm_state_destroy(struct xfrm_state *, bool);
792 static inline void __xfrm_state_put(struct xfrm_state *x)
794 refcount_dec(&x->refcnt);
797 static inline void xfrm_state_put(struct xfrm_state *x)
799 if (refcount_dec_and_test(&x->refcnt))
800 __xfrm_state_destroy(x, false);
803 static inline void xfrm_state_put_sync(struct xfrm_state *x)
805 if (refcount_dec_and_test(&x->refcnt))
806 __xfrm_state_destroy(x, true);
809 static inline void xfrm_state_hold(struct xfrm_state *x)
811 refcount_inc(&x->refcnt);
814 static inline bool addr_match(const void *token1, const void *token2,
815 unsigned int prefixlen)
817 const __be32 *a1 = token1;
818 const __be32 *a2 = token2;
822 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
823 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
826 if (memcmp(a1, a2, pdw << 2))
832 mask = htonl((0xffffffff) << (32 - pbi));
834 if ((a1[pdw] ^ a2[pdw]) & mask)
841 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
843 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
844 if (sizeof(long) == 4 && prefixlen == 0)
846 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
850 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
853 switch(fl->flowi_proto) {
856 case IPPROTO_UDPLITE:
858 port = uli->ports.sport;
862 port = htons(uli->icmpt.type);
865 port = htons(uli->mht.type);
868 port = htons(ntohl(uli->gre_key) >> 16);
877 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
880 switch(fl->flowi_proto) {
883 case IPPROTO_UDPLITE:
885 port = uli->ports.dport;
889 port = htons(uli->icmpt.code);
892 port = htons(ntohl(uli->gre_key) & 0xffff);
900 bool xfrm_selector_match(const struct xfrm_selector *sel,
901 const struct flowi *fl, unsigned short family);
903 #ifdef CONFIG_SECURITY_NETWORK_XFRM
904 /* If neither has a context --> match
905 * Otherwise, both must have a context and the sids, doi, alg must match
907 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
909 return ((!s1 && !s2) ||
911 (s1->ctx_sid == s2->ctx_sid) &&
912 (s1->ctx_doi == s2->ctx_doi) &&
913 (s1->ctx_alg == s2->ctx_alg)));
916 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
922 /* A struct encoding bundle of transformations to apply to some set of flow.
924 * xdst->child points to the next element of bundle.
925 * dst->xfrm points to an instanse of transformer.
927 * Due to unfortunate limitations of current routing cache, which we
928 * have no time to fix, it mirrors struct rtable and bound to the same
929 * routing key, including saddr,daddr. However, we can have many of
930 * bundles differing by session id. All the bundles grow from a parent
935 struct dst_entry dst;
939 struct dst_entry *route;
940 struct dst_entry *child;
941 struct dst_entry *path;
942 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
943 int num_pols, num_xfrms;
946 u32 route_mtu_cached;
947 u32 child_mtu_cached;
952 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
955 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
956 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
961 return (struct dst_entry *) dst;
964 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
967 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
968 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
976 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
981 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
983 xfrm_pols_put(xdst->pols, xdst->num_pols);
984 dst_release(xdst->route);
985 if (likely(xdst->u.dst.xfrm))
986 xfrm_state_put(xdst->u.dst.xfrm);
990 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
992 struct xfrm_if_parms {
993 int link; /* ifindex of underlying L2 interface */
994 u32 if_id; /* interface identifyer */
999 struct xfrm_if __rcu *next; /* next interface in list */
1000 struct net_device *dev; /* virtual device associated with interface */
1001 struct net *net; /* netns for packet i/o */
1002 struct xfrm_if_parms p; /* interface parms */
1004 struct gro_cells gro_cells;
1007 struct xfrm_offload {
1008 /* Output sequence number for replay protection on offloading. */
1015 #define SA_DELETE_REQ 1
1016 #define CRYPTO_DONE 2
1017 #define CRYPTO_NEXT_DONE 4
1018 #define CRYPTO_FALLBACK 8
1019 #define XFRM_GSO_SEGMENT 16
1022 #define XFRM_DEV_RESUME 128
1023 #define XFRM_XMIT 256
1026 #define CRYPTO_SUCCESS 1
1027 #define CRYPTO_GENERIC_ERROR 2
1028 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1029 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1030 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1031 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1032 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1033 #define CRYPTO_INVALID_PROTOCOL 128
1044 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1045 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1048 struct sec_path *secpath_set(struct sk_buff *skb);
1051 secpath_reset(struct sk_buff *skb)
1054 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1059 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1063 return addr->a4 == 0;
1065 return ipv6_addr_any(&addr->in6);
1071 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1073 return (tmpl->saddr.a4 &&
1074 tmpl->saddr.a4 != x->props.saddr.a4);
1078 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1080 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1081 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1085 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1089 return __xfrm4_state_addr_cmp(tmpl, x);
1091 return __xfrm6_state_addr_cmp(tmpl, x);
1097 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1098 unsigned short family);
1100 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1103 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1104 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1109 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1110 int dir, unsigned short family)
1112 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1113 /* same dst may be used for traffic originating from
1114 * devices with different policy settings.
1116 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1118 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1121 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1122 struct sk_buff *skb,
1123 unsigned int family, int reverse)
1125 struct net *net = dev_net(skb->dev);
1126 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1128 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1129 return __xfrm_policy_check(sk, ndir, skb, family);
1131 return __xfrm_check_nopolicy(net, skb, dir) ||
1132 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1133 __xfrm_policy_check(sk, ndir, skb, family);
1136 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1138 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1141 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1143 return xfrm_policy_check(sk, dir, skb, AF_INET);
1146 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1148 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1151 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1152 struct sk_buff *skb)
1154 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1157 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1158 struct sk_buff *skb)
1160 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1163 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1164 unsigned int family, int reverse);
1166 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1167 unsigned int family)
1169 return __xfrm_decode_session(skb, fl, family, 0);
1172 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1174 unsigned int family)
1176 return __xfrm_decode_session(skb, fl, family, 1);
1179 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1181 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1183 struct net *net = dev_net(skb->dev);
1185 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1186 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1189 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1190 __xfrm_route_forward(skb, family);
1193 static inline int xfrm4_route_forward(struct sk_buff *skb)
1195 return xfrm_route_forward(skb, AF_INET);
1198 static inline int xfrm6_route_forward(struct sk_buff *skb)
1200 return xfrm_route_forward(skb, AF_INET6);
1203 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1205 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1207 if (!sk_fullsock(osk))
1209 sk->sk_policy[0] = NULL;
1210 sk->sk_policy[1] = NULL;
1211 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1212 return __xfrm_sk_clone_policy(sk, osk);
1216 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1218 static inline void xfrm_sk_free_policy(struct sock *sk)
1220 struct xfrm_policy *pol;
1222 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1223 if (unlikely(pol != NULL)) {
1224 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1225 sk->sk_policy[0] = NULL;
1227 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1228 if (unlikely(pol != NULL)) {
1229 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1230 sk->sk_policy[1] = NULL;
1236 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1237 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1238 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1239 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1240 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1244 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1248 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1252 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1254 unsigned int family)
1258 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1259 struct sk_buff *skb)
1263 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1264 struct sk_buff *skb)
1271 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1275 return (xfrm_address_t *)&fl->u.ip4.daddr;
1277 return (xfrm_address_t *)&fl->u.ip6.daddr;
1283 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1287 return (xfrm_address_t *)&fl->u.ip4.saddr;
1289 return (xfrm_address_t *)&fl->u.ip6.saddr;
1295 void xfrm_flowi_addr_get(const struct flowi *fl,
1296 xfrm_address_t *saddr, xfrm_address_t *daddr,
1297 unsigned short family)
1301 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1302 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1305 saddr->in6 = fl->u.ip6.saddr;
1306 daddr->in6 = fl->u.ip6.daddr;
1311 static __inline__ int
1312 __xfrm4_state_addr_check(const struct xfrm_state *x,
1313 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1315 if (daddr->a4 == x->id.daddr.a4 &&
1316 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1321 static __inline__ int
1322 __xfrm6_state_addr_check(const struct xfrm_state *x,
1323 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1325 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1326 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1327 ipv6_addr_any((struct in6_addr *)saddr) ||
1328 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1333 static __inline__ int
1334 xfrm_state_addr_check(const struct xfrm_state *x,
1335 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1336 unsigned short family)
1340 return __xfrm4_state_addr_check(x, daddr, saddr);
1342 return __xfrm6_state_addr_check(x, daddr, saddr);
1347 static __inline__ int
1348 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1349 unsigned short family)
1353 return __xfrm4_state_addr_check(x,
1354 (const xfrm_address_t *)&fl->u.ip4.daddr,
1355 (const xfrm_address_t *)&fl->u.ip4.saddr);
1357 return __xfrm6_state_addr_check(x,
1358 (const xfrm_address_t *)&fl->u.ip6.daddr,
1359 (const xfrm_address_t *)&fl->u.ip6.saddr);
1364 static inline int xfrm_state_kern(const struct xfrm_state *x)
1366 return atomic_read(&x->tunnel_users);
1369 static inline bool xfrm_id_proto_valid(u8 proto)
1375 #if IS_ENABLED(CONFIG_IPV6)
1376 case IPPROTO_ROUTING:
1377 case IPPROTO_DSTOPTS:
1385 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1386 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1388 return (!userproto || proto == userproto ||
1389 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1390 proto == IPPROTO_ESP ||
1391 proto == IPPROTO_COMP)));
1395 * xfrm algorithm information
1397 struct xfrm_algo_aead_info {
1402 struct xfrm_algo_auth_info {
1407 struct xfrm_algo_encr_info {
1413 struct xfrm_algo_comp_info {
1417 struct xfrm_algo_desc {
1421 u8 pfkey_supported:1;
1423 struct xfrm_algo_aead_info aead;
1424 struct xfrm_algo_auth_info auth;
1425 struct xfrm_algo_encr_info encr;
1426 struct xfrm_algo_comp_info comp;
1428 struct sadb_alg desc;
1431 /* XFRM protocol handlers. */
1432 struct xfrm4_protocol {
1433 int (*handler)(struct sk_buff *skb);
1434 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1436 int (*cb_handler)(struct sk_buff *skb, int err);
1437 int (*err_handler)(struct sk_buff *skb, u32 info);
1439 struct xfrm4_protocol __rcu *next;
1443 struct xfrm6_protocol {
1444 int (*handler)(struct sk_buff *skb);
1445 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1447 int (*cb_handler)(struct sk_buff *skb, int err);
1448 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1449 u8 type, u8 code, int offset, __be32 info);
1451 struct xfrm6_protocol __rcu *next;
1455 /* XFRM tunnel handlers. */
1456 struct xfrm_tunnel {
1457 int (*handler)(struct sk_buff *skb);
1458 int (*cb_handler)(struct sk_buff *skb, int err);
1459 int (*err_handler)(struct sk_buff *skb, u32 info);
1461 struct xfrm_tunnel __rcu *next;
1465 struct xfrm6_tunnel {
1466 int (*handler)(struct sk_buff *skb);
1467 int (*cb_handler)(struct sk_buff *skb, int err);
1468 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1469 u8 type, u8 code, int offset, __be32 info);
1470 struct xfrm6_tunnel __rcu *next;
1474 void xfrm_init(void);
1475 void xfrm4_init(void);
1476 int xfrm_state_init(struct net *net);
1477 void xfrm_state_fini(struct net *net);
1478 void xfrm4_state_init(void);
1479 void xfrm4_protocol_init(void);
1481 int xfrm6_init(void);
1482 void xfrm6_fini(void);
1483 int xfrm6_state_init(void);
1484 void xfrm6_state_fini(void);
1485 int xfrm6_protocol_init(void);
1486 void xfrm6_protocol_fini(void);
1488 static inline int xfrm6_init(void)
1492 static inline void xfrm6_fini(void)
1498 #ifdef CONFIG_XFRM_STATISTICS
1499 int xfrm_proc_init(struct net *net);
1500 void xfrm_proc_fini(struct net *net);
1503 int xfrm_sysctl_init(struct net *net);
1504 #ifdef CONFIG_SYSCTL
1505 void xfrm_sysctl_fini(struct net *net);
1507 static inline void xfrm_sysctl_fini(struct net *net)
1512 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1513 struct xfrm_address_filter *filter);
1514 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1515 int (*func)(struct xfrm_state *, int, void*), void *);
1516 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1517 struct xfrm_state *xfrm_state_alloc(struct net *net);
1518 void xfrm_state_free(struct xfrm_state *x);
1519 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1520 const xfrm_address_t *saddr,
1521 const struct flowi *fl,
1522 struct xfrm_tmpl *tmpl,
1523 struct xfrm_policy *pol, int *err,
1524 unsigned short family, u32 if_id);
1525 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1526 xfrm_address_t *daddr,
1527 xfrm_address_t *saddr,
1528 unsigned short family,
1529 u8 mode, u8 proto, u32 reqid);
1530 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1531 unsigned short family);
1532 int xfrm_state_check_expire(struct xfrm_state *x);
1533 void xfrm_state_insert(struct xfrm_state *x);
1534 int xfrm_state_add(struct xfrm_state *x);
1535 int xfrm_state_update(struct xfrm_state *x);
1536 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1537 const xfrm_address_t *daddr, __be32 spi,
1538 u8 proto, unsigned short family);
1539 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1540 const xfrm_address_t *daddr,
1541 const xfrm_address_t *saddr,
1543 unsigned short family);
1544 #ifdef CONFIG_XFRM_SUB_POLICY
1545 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1546 unsigned short family);
1547 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1548 unsigned short family);
1550 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1551 int n, unsigned short family)
1555 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1556 int n, unsigned short family)
1561 struct xfrmk_sadinfo {
1562 u32 sadhcnt; /* current hash bkts */
1563 u32 sadhmcnt; /* max allowed hash bkts */
1564 u32 sadcnt; /* current running count */
1567 struct xfrmk_spdinfo {
1578 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1579 int xfrm_state_delete(struct xfrm_state *x);
1580 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1581 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1582 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1583 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1584 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1585 int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1586 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1587 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1588 struct netlink_ext_ack *extack);
1589 int xfrm_init_state(struct xfrm_state *x);
1590 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1591 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1592 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1593 int (*finish)(struct net *, struct sock *,
1595 int xfrm_trans_queue(struct sk_buff *skb,
1596 int (*finish)(struct net *, struct sock *,
1598 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1599 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1601 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1602 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1605 void xfrm_local_error(struct sk_buff *skb, int mtu);
1606 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1607 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1609 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1610 int xfrm4_rcv(struct sk_buff *skb);
1612 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1614 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1615 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1616 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1617 return xfrm_input(skb, nexthdr, spi, 0);
1620 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1621 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1622 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1623 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1624 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1625 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1626 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1627 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1629 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1631 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1632 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1633 int xfrm6_rcv(struct sk_buff *skb);
1634 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1635 xfrm_address_t *saddr, u8 proto);
1636 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1637 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1638 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1639 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1640 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1641 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1642 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1643 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1646 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1647 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1648 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1649 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1652 static inline int xfrm_user_policy(struct sock *sk, int optname,
1653 sockptr_t optval, int optlen)
1655 return -ENOPROTOOPT;
1659 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1660 const xfrm_address_t *saddr,
1661 const xfrm_address_t *daddr,
1662 int family, u32 mark);
1664 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1666 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1667 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1668 int (*func)(struct xfrm_policy *, int, int, void*),
1670 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1671 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1672 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1673 const struct xfrm_mark *mark,
1674 u32 if_id, u8 type, int dir,
1675 struct xfrm_selector *sel,
1676 struct xfrm_sec_ctx *ctx, int delete,
1678 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1679 const struct xfrm_mark *mark, u32 if_id,
1680 u8 type, int dir, u32 id, int delete,
1682 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1683 void xfrm_policy_hash_rebuild(struct net *net);
1684 u32 xfrm_get_acqseq(void);
1685 int verify_spi_info(u8 proto, u32 min, u32 max);
1686 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1687 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1688 u8 mode, u32 reqid, u32 if_id, u8 proto,
1689 const xfrm_address_t *daddr,
1690 const xfrm_address_t *saddr, int create,
1691 unsigned short family);
1692 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1694 #ifdef CONFIG_XFRM_MIGRATE
1695 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1696 const struct xfrm_migrate *m, int num_bundles,
1697 const struct xfrm_kmaddress *k,
1698 const struct xfrm_encap_tmpl *encap);
1699 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1701 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1702 struct xfrm_migrate *m,
1703 struct xfrm_encap_tmpl *encap);
1704 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1705 struct xfrm_migrate *m, int num_bundles,
1706 struct xfrm_kmaddress *k, struct net *net,
1707 struct xfrm_encap_tmpl *encap, u32 if_id);
1710 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1711 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1712 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1713 xfrm_address_t *addr);
1715 void xfrm_input_init(void);
1716 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1718 void xfrm_probe_algs(void);
1719 int xfrm_count_pfkey_auth_supported(void);
1720 int xfrm_count_pfkey_enc_supported(void);
1721 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1722 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1723 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1724 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1725 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1726 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1727 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1728 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1729 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1732 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1733 const xfrm_address_t *b)
1735 return ipv6_addr_equal((const struct in6_addr *)a,
1736 (const struct in6_addr *)b);
1739 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1740 const xfrm_address_t *b,
1746 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1748 return xfrm6_addr_equal(a, b);
1752 static inline int xfrm_policy_id2dir(u32 index)
1758 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1759 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1760 void xfrm_replay_notify(struct xfrm_state *x, int event);
1761 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1762 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1764 static inline int xfrm_aevent_is_on(struct net *net)
1770 nlsk = rcu_dereference(net->xfrm.nlsk);
1772 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1777 static inline int xfrm_acquire_is_on(struct net *net)
1783 nlsk = rcu_dereference(net->xfrm.nlsk);
1785 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1792 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1794 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1797 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1799 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1802 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1804 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1807 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1809 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1812 #ifdef CONFIG_XFRM_MIGRATE
1813 static inline int xfrm_replay_clone(struct xfrm_state *x,
1814 struct xfrm_state *orig)
1817 x->replay_esn = kmemdup(orig->replay_esn,
1818 xfrm_replay_state_esn_len(orig->replay_esn),
1822 x->preplay_esn = kmemdup(orig->preplay_esn,
1823 xfrm_replay_state_esn_len(orig->preplay_esn),
1825 if (!x->preplay_esn)
1831 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1833 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1837 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1839 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1842 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1844 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1847 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1850 for (i = 0; i < n; i++)
1851 xfrm_state_put(*(states + i));
1854 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1857 for (i = 0; i < n; i++)
1858 xfrm_state_delete(*(states + i));
1863 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1865 struct sec_path *sp = skb_sec_path(skb);
1867 return sp->xvec[sp->len - 1];
1871 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1874 struct sec_path *sp = skb_sec_path(skb);
1876 if (!sp || !sp->olen || sp->len != sp->olen)
1879 return &sp->ovec[sp->olen - 1];
1885 void __init xfrm_dev_init(void);
1887 #ifdef CONFIG_XFRM_OFFLOAD
1888 void xfrm_dev_resume(struct sk_buff *skb);
1889 void xfrm_dev_backlog(struct softnet_data *sd);
1890 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1891 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1892 struct xfrm_user_offload *xuo,
1893 struct netlink_ext_ack *extack);
1894 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1896 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1898 struct xfrm_dev_offload *xso = &x->xso;
1900 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1901 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1904 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1906 struct xfrm_state *x = dst->xfrm;
1907 struct xfrm_dst *xdst;
1909 if (!x || !x->type_offload)
1912 xdst = (struct xfrm_dst *) dst;
1913 if (!x->xso.offload_handle && !xdst->child->xfrm)
1915 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1922 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1924 struct xfrm_dev_offload *xso = &x->xso;
1927 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1930 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1932 struct xfrm_dev_offload *xso = &x->xso;
1933 struct net_device *dev = xso->dev;
1935 if (dev && dev->xfrmdev_ops) {
1936 if (dev->xfrmdev_ops->xdo_dev_state_free)
1937 dev->xfrmdev_ops->xdo_dev_state_free(x);
1939 netdev_put(dev, &xso->dev_tracker);
1943 static inline void xfrm_dev_resume(struct sk_buff *skb)
1947 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1951 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1956 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
1961 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1965 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1969 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1974 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1978 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1984 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1986 if (attrs[XFRMA_MARK])
1987 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1994 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1999 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2003 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2005 struct xfrm_mark *m = &x->props.smark;
2007 return (m->v & m->m) | (mark & ~m->m);
2010 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2015 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2019 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2020 unsigned int family)
2022 bool tunnel = false;
2026 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2030 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2034 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2040 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2041 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2043 struct xfrm_translator {
2044 /* Allocate frag_list and put compat translation there */
2045 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2047 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2048 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2049 int maxtype, const struct nla_policy *policy,
2050 struct netlink_ext_ack *extack);
2052 /* Translate 32-bit user_policy from sockptr */
2053 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2055 struct module *owner;
2058 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2059 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2060 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2061 extern struct xfrm_translator *xfrm_get_translator(void);
2062 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2064 static inline struct xfrm_translator *xfrm_get_translator(void)
2068 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2073 #if IS_ENABLED(CONFIG_IPV6)
2074 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2078 if (!sk || sk->sk_family != AF_INET6)
2081 proto = sk->sk_protocol;
2082 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2083 return inet6_sk(sk)->dontfrag;
2088 #endif /* _NET_XFRM_H */