1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _NET_XFRM_H
   3#define _NET_XFRM_H
   4
   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>
  19
  20#include <net/sock.h>
  21#include <net/dst.h>
  22#include <net/ip.h>
  23#include <net/route.h>
  24#include <net/ipv6.h>
  25#include <net/ip6_fib.h>
  26#include <net/flow.h>
  27#include <net/gro_cells.h>
  28
  29#include <linux/interrupt.h>
  30
  31#ifdef CONFIG_XFRM_STATISTICS
  32#include <net/snmp.h>
  33#endif
  34
  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
  42
  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))
  51
  52#ifdef CONFIG_XFRM_STATISTICS
  53#define XFRM_INC_STATS(net, field)	SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
  54#else
  55#define XFRM_INC_STATS(net, field)	((void)(net))
  56#endif
  57
  58
  59/* Organization of SPD aka "XFRM rules"
  60   ------------------------------------
  61
  62   Basic objects:
  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
  67
  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.)
  72
  73   Lookup is plain linear search until the first match with selector.
  74
  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.
  81
  82   dst -. xfrm  .-> xfrm_state #1
  83    |---. child .-> dst -. xfrm .-> xfrm_state #2
  84                     |---. child .-> dst -. xfrm .-> xfrm_state #3
  85                                      |---. child .-> NULL
  86
  87   Bundles are cached at xrfm_policy struct (field ->bundles).
  88
  89
  90   Resolution of xrfm_tmpl
  91   -----------------------
  92   Template contains:
  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
 103      flow id?
 104
 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.
 108
 109   PROBLEMS:
 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.
 118 */
 119
 120struct xfrm_state_walk {
 121	struct list_head	all;
 122	u8			state;
 123	u8			dying;
 124	u8			proto;
 125	u32			seq;
 126	struct xfrm_address_filter *filter;
 127};
 128
 129struct xfrm_state_offload {
 130	struct net_device	*dev;
 131	struct net_device	*real_dev;
 132	unsigned long		offload_handle;
 133	unsigned int		num_exthdrs;
 134	u8			flags;
 135};
 136
 137struct xfrm_mode {
 138	u8 encap;
 139	u8 family;
 140	u8 flags;
 141};
 142
 143/* Flags for xfrm_mode. */
 144enum {
 145	XFRM_MODE_FLAG_TUNNEL = 1,
 146};
 147
 148enum xfrm_replay_mode {
 149	XFRM_REPLAY_MODE_LEGACY,
 150	XFRM_REPLAY_MODE_BMP,
 151	XFRM_REPLAY_MODE_ESN,
 152};
 153
 154/* Full description of state of transformer. */
 155struct xfrm_state {
 156	possible_net_t		xs_net;
 157	union {
 158		struct hlist_node	gclist;
 159		struct hlist_node	bydst;
 160	};
 161	struct hlist_node	bysrc;
 162	struct hlist_node	byspi;
 163	struct hlist_node	byseq;
 164
 165	refcount_t		refcnt;
 166	spinlock_t		lock;
 167
 168	struct xfrm_id		id;
 169	struct xfrm_selector	sel;
 170	struct xfrm_mark	mark;
 171	u32			if_id;
 172	u32			tfcpad;
 173
 174	u32			genid;
 175
 176	/* Key manager bits */
 177	struct xfrm_state_walk	km;
 178
 179	/* Parameters of this state. */
 180	struct {
 181		u32		reqid;
 182		u8		mode;
 183		u8		replay_window;
 184		u8		aalgo, ealgo, calgo;
 185		u8		flags;
 186		u16		family;
 187		xfrm_address_t	saddr;
 188		int		header_len;
 189		int		trailer_len;
 190		u32		extra_flags;
 191		struct xfrm_mark	smark;
 192	} props;
 193
 194	struct xfrm_lifetime_cfg lft;
 195
 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;
 201	const char		*geniv;
 202
 203	/* Data for encapsulator */
 204	struct xfrm_encap_tmpl	*encap;
 205	struct sock __rcu	*encap_sk;
 206
 207	/* Data for care-of address */
 208	xfrm_address_t	*coaddr;
 209
 210	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
 211	struct xfrm_state	*tunnel;
 212
 213	/* If a tunnel, number of users + 1 */
 214	atomic_t		tunnel_users;
 215
 216	/* State for replay detection */
 217	struct xfrm_replay_state replay;
 218	struct xfrm_replay_state_esn *replay_esn;
 219
 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;
 223
 224	/* replay detection mode */
 225	enum xfrm_replay_mode    repl_mode;
 
 226	/* internal flag that only holds state for delayed aevent at the
 227	 * moment
 228	*/
 229	u32			xflags;
 230
 231	/* Replay detection notification settings */
 232	u32			replay_maxage;
 233	u32			replay_maxdiff;
 234
 235	/* Replay detection notification timer */
 236	struct timer_list	rtimer;
 237
 238	/* Statistics */
 239	struct xfrm_stats	stats;
 240
 241	struct xfrm_lifetime_cur curlft;
 242	struct hrtimer		mtimer;
 243
 244	struct xfrm_state_offload xso;
 245
 246	/* used to fix curlft->add_time when changing date */
 247	long		saved_tmo;
 248
 249	/* Last used time */
 250	time64_t		lastused;
 251
 252	struct page_frag xfrag;
 253
 254	/* Reference to data common to all the instances of this
 255	 * transformer. */
 256	const struct xfrm_type	*type;
 257	struct xfrm_mode	inner_mode;
 258	struct xfrm_mode	inner_mode_iaf;
 259	struct xfrm_mode	outer_mode;
 260
 261	const struct xfrm_type_offload	*type_offload;
 262
 263	/* Security context */
 264	struct xfrm_sec_ctx	*security;
 265
 266	/* Private data of this transformer, format is opaque,
 267	 * interpreted by xfrm_type methods. */
 268	void			*data;
 269};
 270
 271static inline struct net *xs_net(struct xfrm_state *x)
 272{
 273	return read_pnet(&x->xs_net);
 274}
 275
 276/* xflags - make enum if more show up */
 277#define XFRM_TIME_DEFER	1
 278#define XFRM_SOFT_EXPIRE 2
 279
 280enum {
 281	XFRM_STATE_VOID,
 282	XFRM_STATE_ACQ,
 283	XFRM_STATE_VALID,
 284	XFRM_STATE_ERROR,
 285	XFRM_STATE_EXPIRED,
 286	XFRM_STATE_DEAD
 287};
 288
 289/* callback structure passed from either netlink or pfkey */
 290struct km_event {
 291	union {
 292		u32 hard;
 293		u32 proto;
 294		u32 byid;
 295		u32 aevent;
 296		u32 type;
 297	} data;
 298
 299	u32	seq;
 300	u32	portid;
 301	u32	event;
 302	struct net *net;
 303};
 304
 305struct xfrm_if_cb {
 306	struct xfrm_if	*(*decode_session)(struct sk_buff *skb,
 307					   unsigned short family);
 
 
 
 
 
 
 
 308};
 309
 310void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
 311void xfrm_if_unregister_cb(void);
 312
 313struct net_device;
 314struct xfrm_type;
 315struct xfrm_dst;
 316struct xfrm_policy_afinfo {
 
 317	struct dst_ops		*dst_ops;
 
 318	struct dst_entry	*(*dst_lookup)(struct net *net,
 319					       int tos, int oif,
 320					       const xfrm_address_t *saddr,
 321					       const xfrm_address_t *daddr,
 322					       u32 mark);
 323	int			(*get_saddr)(struct net *net, int oif,
 324					     xfrm_address_t *saddr,
 325					     xfrm_address_t *daddr,
 326					     u32 mark);
 
 
 
 
 
 
 327	int			(*fill_dst)(struct xfrm_dst *xdst,
 328					    struct net_device *dev,
 329					    const struct flowi *fl);
 330	struct dst_entry	*(*blackhole_route)(struct net *net, struct dst_entry *orig);
 331};
 332
 333int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
 334void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
 335void km_policy_notify(struct xfrm_policy *xp, int dir,
 336		      const struct km_event *c);
 337void km_state_notify(struct xfrm_state *x, const struct km_event *c);
 338
 339struct xfrm_tmpl;
 340int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
 341	     struct xfrm_policy *pol);
 342void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 343int __xfrm_state_delete(struct xfrm_state *x);
 344
 345struct xfrm_state_afinfo {
 346	u8				family;
 347	u8				proto;
 348
 349	const struct xfrm_type_offload *type_offload_esp;
 350
 351	const struct xfrm_type		*type_esp;
 352	const struct xfrm_type		*type_ipip;
 353	const struct xfrm_type		*type_ipip6;
 354	const struct xfrm_type		*type_comp;
 355	const struct xfrm_type		*type_ah;
 356	const struct xfrm_type		*type_routing;
 357	const struct xfrm_type		*type_dstopts;
 358
 
 
 359	int			(*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
 
 
 
 
 
 360	int			(*transport_finish)(struct sk_buff *skb,
 361						    int async);
 362	void			(*local_error)(struct sk_buff *skb, u32 mtu);
 363};
 364
 365int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 366int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 367struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
 368struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
 369
 370struct xfrm_input_afinfo {
 371	u8			family;
 372	bool			is_ipip;
 373	int			(*callback)(struct sk_buff *skb, u8 protocol,
 374					    int err);
 375};
 376
 377int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
 378int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
 379
 380void xfrm_flush_gc(void);
 381void xfrm_state_delete_tunnel(struct xfrm_state *x);
 382
 383struct xfrm_type {
 
 384	struct module		*owner;
 385	u8			proto;
 386	u8			flags;
 387#define XFRM_TYPE_NON_FRAGMENT	1
 388#define XFRM_TYPE_REPLAY_PROT	2
 389#define XFRM_TYPE_LOCAL_COADDR	4
 390#define XFRM_TYPE_REMOTE_COADDR	8
 391
 392	int			(*init_state)(struct xfrm_state *x);
 393	void			(*destructor)(struct xfrm_state *);
 394	int			(*input)(struct xfrm_state *, struct sk_buff *skb);
 395	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
 396	int			(*reject)(struct xfrm_state *, struct sk_buff *,
 397					  const struct flowi *);
 
 
 
 398};
 399
 400int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 401void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 402
 403struct xfrm_type_offload {
 404	struct module	*owner;
 405	u8		proto;
 406	void		(*encap)(struct xfrm_state *, struct sk_buff *pskb);
 407	int		(*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
 408	int		(*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
 409};
 410
 411int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
 412void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
 413
 414static inline int xfrm_af2proto(unsigned int family)
 415{
 416	switch(family) {
 417	case AF_INET:
 418		return IPPROTO_IPIP;
 419	case AF_INET6:
 420		return IPPROTO_IPV6;
 421	default:
 422		return 0;
 423	}
 424}
 425
 426static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 427{
 428	if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 429	    (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 430		return &x->inner_mode;
 431	else
 432		return &x->inner_mode_iaf;
 433}
 434
 435struct xfrm_tmpl {
 436/* id in template is interpreted as:
 437 * daddr - destination of tunnel, may be zero for transport mode.
 438 * spi   - zero to acquire spi. Not zero if spi is static, then
 439 *	   daddr must be fixed too.
 440 * proto - AH/ESP/IPCOMP
 441 */
 442	struct xfrm_id		id;
 443
 444/* Source address of tunnel. Ignored, if it is not a tunnel. */
 445	xfrm_address_t		saddr;
 446
 447	unsigned short		encap_family;
 448
 449	u32			reqid;
 450
 451/* Mode: transport, tunnel etc. */
 452	u8			mode;
 453
 454/* Sharing mode: unique, this session only, this user only etc. */
 455	u8			share;
 456
 457/* May skip this transfomration if no SA is found */
 458	u8			optional;
 459
 460/* Skip aalgos/ealgos/calgos checks. */
 461	u8			allalgs;
 462
 463/* Bit mask of algos allowed for acquisition */
 464	u32			aalgos;
 465	u32			ealgos;
 466	u32			calgos;
 467};
 468
 469#define XFRM_MAX_DEPTH		6
 470#define XFRM_MAX_OFFLOAD_DEPTH	1
 471
 472struct xfrm_policy_walk_entry {
 473	struct list_head	all;
 474	u8			dead;
 475};
 476
 477struct xfrm_policy_walk {
 478	struct xfrm_policy_walk_entry walk;
 479	u8 type;
 480	u32 seq;
 481};
 482
 483struct xfrm_policy_queue {
 484	struct sk_buff_head	hold_queue;
 485	struct timer_list	hold_timer;
 486	unsigned long		timeout;
 487};
 488
 489struct xfrm_policy {
 490	possible_net_t		xp_net;
 491	struct hlist_node	bydst;
 492	struct hlist_node	byidx;
 493
 494	/* This lock only affects elements except for entry. */
 495	rwlock_t		lock;
 496	refcount_t		refcnt;
 497	u32			pos;
 498	struct timer_list	timer;
 499
 
 500	atomic_t		genid;
 501	u32			priority;
 502	u32			index;
 503	u32			if_id;
 504	struct xfrm_mark	mark;
 505	struct xfrm_selector	selector;
 506	struct xfrm_lifetime_cfg lft;
 507	struct xfrm_lifetime_cur curlft;
 508	struct xfrm_policy_walk_entry walk;
 509	struct xfrm_policy_queue polq;
 510	bool                    bydst_reinsert;
 511	u8			type;
 512	u8			action;
 513	u8			flags;
 514	u8			xfrm_nr;
 515	u16			family;
 516	struct xfrm_sec_ctx	*security;
 517	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
 518	struct hlist_node	bydst_inexact_list;
 519	struct rcu_head		rcu;
 520};
 521
 522static inline struct net *xp_net(const struct xfrm_policy *xp)
 523{
 524	return read_pnet(&xp->xp_net);
 525}
 526
 527struct xfrm_kmaddress {
 528	xfrm_address_t          local;
 529	xfrm_address_t          remote;
 530	u32			reserved;
 531	u16			family;
 532};
 533
 534struct xfrm_migrate {
 535	xfrm_address_t		old_daddr;
 536	xfrm_address_t		old_saddr;
 537	xfrm_address_t		new_daddr;
 538	xfrm_address_t		new_saddr;
 539	u8			proto;
 540	u8			mode;
 541	u16			reserved;
 542	u32			reqid;
 543	u16			old_family;
 544	u16			new_family;
 545};
 546
 547#define XFRM_KM_TIMEOUT                30
 548/* what happened */
 549#define XFRM_REPLAY_UPDATE	XFRM_AE_CR
 550#define XFRM_REPLAY_TIMEOUT	XFRM_AE_CE
 551
 552/* default aevent timeout in units of 100ms */
 553#define XFRM_AE_ETIME			10
 554/* Async Event timer multiplier */
 555#define XFRM_AE_ETH_M			10
 556/* default seq threshold size */
 557#define XFRM_AE_SEQT_SIZE		2
 558
 559struct xfrm_mgr {
 560	struct list_head	list;
 
 561	int			(*notify)(struct xfrm_state *x, const struct km_event *c);
 562	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
 563	struct xfrm_policy	*(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 564	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 565	int			(*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
 566	int			(*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 567	int			(*migrate)(const struct xfrm_selector *sel,
 568					   u8 dir, u8 type,
 569					   const struct xfrm_migrate *m,
 570					   int num_bundles,
 571					   const struct xfrm_kmaddress *k,
 572					   const struct xfrm_encap_tmpl *encap);
 573	bool			(*is_alive)(const struct km_event *c);
 574};
 575
 576int xfrm_register_km(struct xfrm_mgr *km);
 577int xfrm_unregister_km(struct xfrm_mgr *km);
 578
 579struct xfrm_tunnel_skb_cb {
 580	union {
 581		struct inet_skb_parm h4;
 582		struct inet6_skb_parm h6;
 583	} header;
 584
 585	union {
 586		struct ip_tunnel *ip4;
 587		struct ip6_tnl *ip6;
 588	} tunnel;
 589};
 590
 591#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
 592
 593/*
 594 * This structure is used for the duration where packets are being
 595 * transformed by IPsec.  As soon as the packet leaves IPsec the
 596 * area beyond the generic IP part may be overwritten.
 597 */
 598struct xfrm_skb_cb {
 599	struct xfrm_tunnel_skb_cb header;
 600
 601        /* Sequence number for replay protection. */
 602	union {
 603		struct {
 604			__u32 low;
 605			__u32 hi;
 606		} output;
 607		struct {
 608			__be32 low;
 609			__be32 hi;
 610		} input;
 611	} seq;
 612};
 613
 614#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 615
 616/*
 617 * This structure is used by the afinfo prepare_input/prepare_output functions
 618 * to transmit header information to the mode input/output functions.
 619 */
 620struct xfrm_mode_skb_cb {
 621	struct xfrm_tunnel_skb_cb header;
 622
 623	/* Copied from header for IPv4, always set to zero and DF for IPv6. */
 624	__be16 id;
 625	__be16 frag_off;
 626
 627	/* IP header length (excluding options or extension headers). */
 628	u8 ihl;
 629
 630	/* TOS for IPv4, class for IPv6. */
 631	u8 tos;
 632
 633	/* TTL for IPv4, hop limitfor IPv6. */
 634	u8 ttl;
 635
 636	/* Protocol for IPv4, NH for IPv6. */
 637	u8 protocol;
 638
 639	/* Option length for IPv4, zero for IPv6. */
 640	u8 optlen;
 641
 642	/* Used by IPv6 only, zero for IPv4. */
 643	u8 flow_lbl[3];
 644};
 645
 646#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 647
 648/*
 649 * This structure is used by the input processing to locate the SPI and
 650 * related information.
 651 */
 652struct xfrm_spi_skb_cb {
 653	struct xfrm_tunnel_skb_cb header;
 654
 655	unsigned int daddroff;
 656	unsigned int family;
 657	__be32 seq;
 658};
 659
 660#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 661
 662#ifdef CONFIG_AUDITSYSCALL
 663static inline struct audit_buffer *xfrm_audit_start(const char *op)
 664{
 665	struct audit_buffer *audit_buf = NULL;
 666
 667	if (audit_enabled == AUDIT_OFF)
 668		return NULL;
 669	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
 670				    AUDIT_MAC_IPSEC_EVENT);
 671	if (audit_buf == NULL)
 672		return NULL;
 673	audit_log_format(audit_buf, "op=%s", op);
 674	return audit_buf;
 675}
 676
 677static inline void xfrm_audit_helper_usrinfo(bool task_valid,
 678					     struct audit_buffer *audit_buf)
 679{
 680	const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
 681					    audit_get_loginuid(current) :
 682					    INVALID_UID);
 683	const unsigned int ses = task_valid ? audit_get_sessionid(current) :
 684		AUDIT_SID_UNSET;
 685
 686	audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 687	audit_log_task_context(audit_buf);
 688}
 689
 690void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
 691void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 692			      bool task_valid);
 693void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
 694void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
 695void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 696				      struct sk_buff *skb);
 697void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
 698			     __be32 net_seq);
 699void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 700void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
 701			       __be32 net_seq);
 702void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
 703			      u8 proto);
 704#else
 705
 706static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 707					 bool task_valid)
 708{
 709}
 710
 711static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 712					    bool task_valid)
 713{
 714}
 715
 716static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 717					bool task_valid)
 718{
 719}
 720
 721static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 722					   bool task_valid)
 723{
 724}
 725
 726static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 727					     struct sk_buff *skb)
 728{
 729}
 730
 731static inline void xfrm_audit_state_replay(struct xfrm_state *x,
 732					   struct sk_buff *skb, __be32 net_seq)
 733{
 734}
 735
 736static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 737				      u16 family)
 738{
 739}
 740
 741static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 742				      __be32 net_spi, __be32 net_seq)
 743{
 744}
 745
 746static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 747				     struct sk_buff *skb, u8 proto)
 748{
 749}
 750#endif /* CONFIG_AUDITSYSCALL */
 751
 752static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 753{
 754	if (likely(policy != NULL))
 755		refcount_inc(&policy->refcnt);
 756}
 757
 758void xfrm_policy_destroy(struct xfrm_policy *policy);
 759
 760static inline void xfrm_pol_put(struct xfrm_policy *policy)
 761{
 762	if (refcount_dec_and_test(&policy->refcnt))
 763		xfrm_policy_destroy(policy);
 764}
 765
 766static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 767{
 768	int i;
 769	for (i = npols - 1; i >= 0; --i)
 770		xfrm_pol_put(pols[i]);
 771}
 772
 773void __xfrm_state_destroy(struct xfrm_state *, bool);
 774
 775static inline void __xfrm_state_put(struct xfrm_state *x)
 776{
 777	refcount_dec(&x->refcnt);
 778}
 779
 780static inline void xfrm_state_put(struct xfrm_state *x)
 781{
 782	if (refcount_dec_and_test(&x->refcnt))
 783		__xfrm_state_destroy(x, false);
 784}
 785
 786static inline void xfrm_state_put_sync(struct xfrm_state *x)
 787{
 788	if (refcount_dec_and_test(&x->refcnt))
 789		__xfrm_state_destroy(x, true);
 790}
 791
 792static inline void xfrm_state_hold(struct xfrm_state *x)
 793{
 794	refcount_inc(&x->refcnt);
 795}
 796
 797static inline bool addr_match(const void *token1, const void *token2,
 798			      unsigned int prefixlen)
 799{
 800	const __be32 *a1 = token1;
 801	const __be32 *a2 = token2;
 802	unsigned int pdw;
 803	unsigned int pbi;
 804
 805	pdw = prefixlen >> 5;	  /* num of whole u32 in prefix */
 806	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 807
 808	if (pdw)
 809		if (memcmp(a1, a2, pdw << 2))
 810			return false;
 811
 812	if (pbi) {
 813		__be32 mask;
 814
 815		mask = htonl((0xffffffff) << (32 - pbi));
 816
 817		if ((a1[pdw] ^ a2[pdw]) & mask)
 818			return false;
 819	}
 820
 821	return true;
 822}
 823
 824static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
 825{
 826	/* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
 827	if (sizeof(long) == 4 && prefixlen == 0)
 828		return true;
 829	return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
 830}
 831
 832static __inline__
 833__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
 834{
 835	__be16 port;
 836	switch(fl->flowi_proto) {
 837	case IPPROTO_TCP:
 838	case IPPROTO_UDP:
 839	case IPPROTO_UDPLITE:
 840	case IPPROTO_SCTP:
 841		port = uli->ports.sport;
 842		break;
 843	case IPPROTO_ICMP:
 844	case IPPROTO_ICMPV6:
 845		port = htons(uli->icmpt.type);
 846		break;
 847	case IPPROTO_MH:
 848		port = htons(uli->mht.type);
 849		break;
 850	case IPPROTO_GRE:
 851		port = htons(ntohl(uli->gre_key) >> 16);
 852		break;
 853	default:
 854		port = 0;	/*XXX*/
 855	}
 856	return port;
 857}
 858
 859static __inline__
 860__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
 861{
 862	__be16 port;
 863	switch(fl->flowi_proto) {
 864	case IPPROTO_TCP:
 865	case IPPROTO_UDP:
 866	case IPPROTO_UDPLITE:
 867	case IPPROTO_SCTP:
 868		port = uli->ports.dport;
 869		break;
 870	case IPPROTO_ICMP:
 871	case IPPROTO_ICMPV6:
 872		port = htons(uli->icmpt.code);
 873		break;
 874	case IPPROTO_GRE:
 875		port = htons(ntohl(uli->gre_key) & 0xffff);
 876		break;
 877	default:
 878		port = 0;	/*XXX*/
 879	}
 880	return port;
 881}
 882
 883bool xfrm_selector_match(const struct xfrm_selector *sel,
 884			 const struct flowi *fl, unsigned short family);
 885
 886#ifdef CONFIG_SECURITY_NETWORK_XFRM
 887/*	If neither has a context --> match
 888 * 	Otherwise, both must have a context and the sids, doi, alg must match
 889 */
 890static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 891{
 892	return ((!s1 && !s2) ||
 893		(s1 && s2 &&
 894		 (s1->ctx_sid == s2->ctx_sid) &&
 895		 (s1->ctx_doi == s2->ctx_doi) &&
 896		 (s1->ctx_alg == s2->ctx_alg)));
 897}
 898#else
 899static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 900{
 901	return true;
 902}
 903#endif
 904
 905/* A struct encoding bundle of transformations to apply to some set of flow.
 906 *
 907 * xdst->child points to the next element of bundle.
 908 * dst->xfrm  points to an instanse of transformer.
 909 *
 910 * Due to unfortunate limitations of current routing cache, which we
 911 * have no time to fix, it mirrors struct rtable and bound to the same
 912 * routing key, including saddr,daddr. However, we can have many of
 913 * bundles differing by session id. All the bundles grow from a parent
 914 * policy rule.
 915 */
 916struct xfrm_dst {
 917	union {
 918		struct dst_entry	dst;
 919		struct rtable		rt;
 920		struct rt6_info		rt6;
 921	} u;
 922	struct dst_entry *route;
 923	struct dst_entry *child;
 924	struct dst_entry *path;
 925	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
 926	int num_pols, num_xfrms;
 
 
 
 
 927	u32 xfrm_genid;
 928	u32 policy_genid;
 929	u32 route_mtu_cached;
 930	u32 child_mtu_cached;
 931	u32 route_cookie;
 932	u32 path_cookie;
 933};
 934
 935static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
 936{
 937#ifdef CONFIG_XFRM
 938	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
 939		const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
 940
 941		return xdst->path;
 942	}
 943#endif
 944	return (struct dst_entry *) dst;
 945}
 946
 947static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
 948{
 949#ifdef CONFIG_XFRM
 950	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
 951		struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
 952		return xdst->child;
 953	}
 954#endif
 955	return NULL;
 956}
 957
 958#ifdef CONFIG_XFRM
 959static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
 960{
 961	xdst->child = child;
 962}
 963
 964static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 965{
 966	xfrm_pols_put(xdst->pols, xdst->num_pols);
 967	dst_release(xdst->route);
 968	if (likely(xdst->u.dst.xfrm))
 969		xfrm_state_put(xdst->u.dst.xfrm);
 
 
 
 
 
 
 970}
 971#endif
 972
 973void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 974
 975struct xfrm_if_parms {
 976	int link;		/* ifindex of underlying L2 interface */
 977	u32 if_id;		/* interface identifyer */
 978};
 979
 980struct xfrm_if {
 981	struct xfrm_if __rcu *next;	/* next interface in list */
 982	struct net_device *dev;		/* virtual device associated with interface */
 983	struct net *net;		/* netns for packet i/o */
 984	struct xfrm_if_parms p;		/* interface parms */
 985
 986	struct gro_cells gro_cells;
 987};
 988
 989struct xfrm_offload {
 990	/* Output sequence number for replay protection on offloading. */
 991	struct {
 992		__u32 low;
 993		__u32 hi;
 994	} seq;
 995
 996	__u32			flags;
 997#define	SA_DELETE_REQ		1
 998#define	CRYPTO_DONE		2
 999#define	CRYPTO_NEXT_DONE	4
1000#define	CRYPTO_FALLBACK		8
1001#define	XFRM_GSO_SEGMENT	16
1002#define	XFRM_GRO		32
1003#define	XFRM_ESP_NO_TRAILER	64
1004#define	XFRM_DEV_RESUME		128
1005#define	XFRM_XMIT		256
1006
1007	__u32			status;
1008#define CRYPTO_SUCCESS				1
1009#define CRYPTO_GENERIC_ERROR			2
1010#define CRYPTO_TRANSPORT_AH_AUTH_FAILED		4
1011#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED	8
1012#define CRYPTO_TUNNEL_AH_AUTH_FAILED		16
1013#define CRYPTO_TUNNEL_ESP_AUTH_FAILED		32
1014#define CRYPTO_INVALID_PACKET_SYNTAX		64
1015#define CRYPTO_INVALID_PROTOCOL			128
1016
1017	__u8			proto;
1018	__u8			inner_ipproto;
1019};
 
 
 
 
1020
1021struct sec_path {
1022	int			len;
1023	int			olen;
1024
1025	struct xfrm_state	*xvec[XFRM_MAX_DEPTH];
1026	struct xfrm_offload	ovec[XFRM_MAX_OFFLOAD_DEPTH];
1027};
 
 
 
1028
1029struct sec_path *secpath_set(struct sk_buff *skb);
1030
1031static inline void
1032secpath_reset(struct sk_buff *skb)
1033{
1034#ifdef CONFIG_XFRM
1035	skb_ext_del(skb, SKB_EXT_SEC_PATH);
 
1036#endif
1037}
1038
1039static inline int
1040xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1041{
1042	switch (family) {
1043	case AF_INET:
1044		return addr->a4 == 0;
1045	case AF_INET6:
1046		return ipv6_addr_any(&addr->in6);
1047	}
1048	return 0;
1049}
1050
1051static inline int
1052__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1053{
1054	return	(tmpl->saddr.a4 &&
1055		 tmpl->saddr.a4 != x->props.saddr.a4);
1056}
1057
1058static inline int
1059__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1060{
1061	return	(!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1062		 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1063}
1064
1065static inline int
1066xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1067{
1068	switch (family) {
1069	case AF_INET:
1070		return __xfrm4_state_addr_cmp(tmpl, x);
1071	case AF_INET6:
1072		return __xfrm6_state_addr_cmp(tmpl, x);
1073	}
1074	return !0;
1075}
1076
1077#ifdef CONFIG_XFRM
1078int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1079			unsigned short family);
1080
1081static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1082				       struct sk_buff *skb,
1083				       unsigned int family, int reverse)
1084{
1085	struct net *net = dev_net(skb->dev);
1086	int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1087
1088	if (sk && sk->sk_policy[XFRM_POLICY_IN])
1089		return __xfrm_policy_check(sk, ndir, skb, family);
1090
1091	return	(!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1092		(skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) ||
1093		__xfrm_policy_check(sk, ndir, skb, family);
1094}
1095
1096static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1097{
1098	return __xfrm_policy_check2(sk, dir, skb, family, 0);
1099}
1100
1101static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1102{
1103	return xfrm_policy_check(sk, dir, skb, AF_INET);
1104}
1105
1106static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1107{
1108	return xfrm_policy_check(sk, dir, skb, AF_INET6);
1109}
1110
1111static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1112					     struct sk_buff *skb)
1113{
1114	return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1115}
1116
1117static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1118					     struct sk_buff *skb)
1119{
1120	return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1121}
1122
1123int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1124			  unsigned int family, int reverse);
1125
1126static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1127				      unsigned int family)
1128{
1129	return __xfrm_decode_session(skb, fl, family, 0);
1130}
1131
1132static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1133					      struct flowi *fl,
1134					      unsigned int family)
1135{
1136	return __xfrm_decode_session(skb, fl, family, 1);
1137}
1138
1139int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1140
1141static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1142{
1143	struct net *net = dev_net(skb->dev);
1144
1145	return	!net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1146		(skb_dst(skb)->flags & DST_NOXFRM) ||
1147		__xfrm_route_forward(skb, family);
1148}
1149
1150static inline int xfrm4_route_forward(struct sk_buff *skb)
1151{
1152	return xfrm_route_forward(skb, AF_INET);
1153}
1154
1155static inline int xfrm6_route_forward(struct sk_buff *skb)
1156{
1157	return xfrm_route_forward(skb, AF_INET6);
1158}
1159
1160int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1161
1162static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1163{
1164	sk->sk_policy[0] = NULL;
1165	sk->sk_policy[1] = NULL;
1166	if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1167		return __xfrm_sk_clone_policy(sk, osk);
1168	return 0;
1169}
1170
1171int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1172
1173static inline void xfrm_sk_free_policy(struct sock *sk)
1174{
1175	struct xfrm_policy *pol;
1176
1177	pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1178	if (unlikely(pol != NULL)) {
1179		xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1180		sk->sk_policy[0] = NULL;
1181	}
1182	pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1183	if (unlikely(pol != NULL)) {
1184		xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1185		sk->sk_policy[1] = NULL;
1186	}
1187}
1188
 
 
1189#else
1190
1191static inline void xfrm_sk_free_policy(struct sock *sk) {}
1192static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1193static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1194static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1195static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1196{
1197	return 1;
1198}
1199static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1200{
1201	return 1;
1202}
1203static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1204{
1205	return 1;
1206}
1207static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1208					      struct flowi *fl,
1209					      unsigned int family)
1210{
1211	return -ENOSYS;
1212}
1213static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1214					     struct sk_buff *skb)
1215{
1216	return 1;
1217}
1218static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1219					     struct sk_buff *skb)
1220{
1221	return 1;
1222}
 
 
 
1223#endif
1224
1225static __inline__
1226xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1227{
1228	switch (family){
1229	case AF_INET:
1230		return (xfrm_address_t *)&fl->u.ip4.daddr;
1231	case AF_INET6:
1232		return (xfrm_address_t *)&fl->u.ip6.daddr;
1233	}
1234	return NULL;
1235}
1236
1237static __inline__
1238xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1239{
1240	switch (family){
1241	case AF_INET:
1242		return (xfrm_address_t *)&fl->u.ip4.saddr;
1243	case AF_INET6:
1244		return (xfrm_address_t *)&fl->u.ip6.saddr;
1245	}
1246	return NULL;
1247}
1248
1249static __inline__
1250void xfrm_flowi_addr_get(const struct flowi *fl,
1251			 xfrm_address_t *saddr, xfrm_address_t *daddr,
1252			 unsigned short family)
1253{
1254	switch(family) {
1255	case AF_INET:
1256		memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1257		memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1258		break;
1259	case AF_INET6:
1260		saddr->in6 = fl->u.ip6.saddr;
1261		daddr->in6 = fl->u.ip6.daddr;
1262		break;
1263	}
1264}
1265
1266static __inline__ int
1267__xfrm4_state_addr_check(const struct xfrm_state *x,
1268			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1269{
1270	if (daddr->a4 == x->id.daddr.a4 &&
1271	    (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1272		return 1;
1273	return 0;
1274}
1275
1276static __inline__ int
1277__xfrm6_state_addr_check(const struct xfrm_state *x,
1278			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1279{
1280	if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1281	    (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1282	     ipv6_addr_any((struct in6_addr *)saddr) ||
1283	     ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1284		return 1;
1285	return 0;
1286}
1287
1288static __inline__ int
1289xfrm_state_addr_check(const struct xfrm_state *x,
1290		      const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1291		      unsigned short family)
1292{
1293	switch (family) {
1294	case AF_INET:
1295		return __xfrm4_state_addr_check(x, daddr, saddr);
1296	case AF_INET6:
1297		return __xfrm6_state_addr_check(x, daddr, saddr);
1298	}
1299	return 0;
1300}
1301
1302static __inline__ int
1303xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1304			   unsigned short family)
1305{
1306	switch (family) {
1307	case AF_INET:
1308		return __xfrm4_state_addr_check(x,
1309						(const xfrm_address_t *)&fl->u.ip4.daddr,
1310						(const xfrm_address_t *)&fl->u.ip4.saddr);
1311	case AF_INET6:
1312		return __xfrm6_state_addr_check(x,
1313						(const xfrm_address_t *)&fl->u.ip6.daddr,
1314						(const xfrm_address_t *)&fl->u.ip6.saddr);
1315	}
1316	return 0;
1317}
1318
1319static inline int xfrm_state_kern(const struct xfrm_state *x)
1320{
1321	return atomic_read(&x->tunnel_users);
1322}
1323
1324static inline bool xfrm_id_proto_valid(u8 proto)
1325{
1326	switch (proto) {
1327	case IPPROTO_AH:
1328	case IPPROTO_ESP:
1329	case IPPROTO_COMP:
1330#if IS_ENABLED(CONFIG_IPV6)
1331	case IPPROTO_ROUTING:
1332	case IPPROTO_DSTOPTS:
1333#endif
1334		return true;
1335	default:
1336		return false;
1337	}
1338}
1339
1340/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1341static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1342{
1343	return (!userproto || proto == userproto ||
1344		(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1345						  proto == IPPROTO_ESP ||
1346						  proto == IPPROTO_COMP)));
1347}
1348
1349/*
1350 * xfrm algorithm information
1351 */
1352struct xfrm_algo_aead_info {
1353	char *geniv;
1354	u16 icv_truncbits;
1355};
1356
1357struct xfrm_algo_auth_info {
1358	u16 icv_truncbits;
1359	u16 icv_fullbits;
1360};
1361
1362struct xfrm_algo_encr_info {
1363	char *geniv;
1364	u16 blockbits;
1365	u16 defkeybits;
1366};
1367
1368struct xfrm_algo_comp_info {
1369	u16 threshold;
1370};
1371
1372struct xfrm_algo_desc {
1373	char *name;
1374	char *compat;
1375	u8 available:1;
1376	u8 pfkey_supported:1;
1377	union {
1378		struct xfrm_algo_aead_info aead;
1379		struct xfrm_algo_auth_info auth;
1380		struct xfrm_algo_encr_info encr;
1381		struct xfrm_algo_comp_info comp;
1382	} uinfo;
1383	struct sadb_alg desc;
1384};
1385
1386/* XFRM protocol handlers.  */
1387struct xfrm4_protocol {
1388	int (*handler)(struct sk_buff *skb);
1389	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1390			     int encap_type);
1391	int (*cb_handler)(struct sk_buff *skb, int err);
1392	int (*err_handler)(struct sk_buff *skb, u32 info);
1393
1394	struct xfrm4_protocol __rcu *next;
1395	int priority;
1396};
1397
1398struct xfrm6_protocol {
1399	int (*handler)(struct sk_buff *skb);
1400	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1401			     int encap_type);
1402	int (*cb_handler)(struct sk_buff *skb, int err);
1403	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1404			   u8 type, u8 code, int offset, __be32 info);
1405
1406	struct xfrm6_protocol __rcu *next;
1407	int priority;
1408};
1409
1410/* XFRM tunnel handlers.  */
1411struct xfrm_tunnel {
1412	int (*handler)(struct sk_buff *skb);
1413	int (*cb_handler)(struct sk_buff *skb, int err);
1414	int (*err_handler)(struct sk_buff *skb, u32 info);
1415
1416	struct xfrm_tunnel __rcu *next;
1417	int priority;
1418};
1419
1420struct xfrm6_tunnel {
1421	int (*handler)(struct sk_buff *skb);
1422	int (*cb_handler)(struct sk_buff *skb, int err);
1423	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1424			   u8 type, u8 code, int offset, __be32 info);
1425	struct xfrm6_tunnel __rcu *next;
1426	int priority;
1427};
1428
1429void xfrm_init(void);
1430void xfrm4_init(void);
1431int xfrm_state_init(struct net *net);
1432void xfrm_state_fini(struct net *net);
1433void xfrm4_state_init(void);
1434void xfrm4_protocol_init(void);
1435#ifdef CONFIG_XFRM
1436int xfrm6_init(void);
1437void xfrm6_fini(void);
1438int xfrm6_state_init(void);
1439void xfrm6_state_fini(void);
1440int xfrm6_protocol_init(void);
1441void xfrm6_protocol_fini(void);
1442#else
1443static inline int xfrm6_init(void)
1444{
1445	return 0;
1446}
1447static inline void xfrm6_fini(void)
1448{
1449	;
1450}
1451#endif
1452
1453#ifdef CONFIG_XFRM_STATISTICS
1454int xfrm_proc_init(struct net *net);
1455void xfrm_proc_fini(struct net *net);
1456#endif
1457
1458int xfrm_sysctl_init(struct net *net);
1459#ifdef CONFIG_SYSCTL
1460void xfrm_sysctl_fini(struct net *net);
1461#else
1462static inline void xfrm_sysctl_fini(struct net *net)
1463{
1464}
1465#endif
1466
1467void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1468			  struct xfrm_address_filter *filter);
1469int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1470		    int (*func)(struct xfrm_state *, int, void*), void *);
1471void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1472struct xfrm_state *xfrm_state_alloc(struct net *net);
1473void xfrm_state_free(struct xfrm_state *x);
1474struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1475				   const xfrm_address_t *saddr,
1476				   const struct flowi *fl,
1477				   struct xfrm_tmpl *tmpl,
1478				   struct xfrm_policy *pol, int *err,
1479				   unsigned short family, u32 if_id);
1480struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1481				       xfrm_address_t *daddr,
1482				       xfrm_address_t *saddr,
1483				       unsigned short family,
1484				       u8 mode, u8 proto, u32 reqid);
1485struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1486					      unsigned short family);
1487int xfrm_state_check_expire(struct xfrm_state *x);
1488void xfrm_state_insert(struct xfrm_state *x);
1489int xfrm_state_add(struct xfrm_state *x);
1490int xfrm_state_update(struct xfrm_state *x);
1491struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1492				     const xfrm_address_t *daddr, __be32 spi,
1493				     u8 proto, unsigned short family);
1494struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1495					    const xfrm_address_t *daddr,
1496					    const xfrm_address_t *saddr,
1497					    u8 proto,
1498					    unsigned short family);
1499#ifdef CONFIG_XFRM_SUB_POLICY
1500void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
 
 
1501		    unsigned short family);
1502void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1503		     unsigned short family);
1504#else
1505static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1506				  int n, unsigned short family)
1507{
 
1508}
1509
1510static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1511				   int n, unsigned short family)
1512{
 
1513}
1514#endif
1515
1516struct xfrmk_sadinfo {
1517	u32 sadhcnt; /* current hash bkts */
1518	u32 sadhmcnt; /* max allowed hash bkts */
1519	u32 sadcnt; /* current running count */
1520};
1521
1522struct xfrmk_spdinfo {
1523	u32 incnt;
1524	u32 outcnt;
1525	u32 fwdcnt;
1526	u32 inscnt;
1527	u32 outscnt;
1528	u32 fwdscnt;
1529	u32 spdhcnt;
1530	u32 spdhmcnt;
1531};
1532
1533struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1534int xfrm_state_delete(struct xfrm_state *x);
1535int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1536int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1537void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1538void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1539u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1540int xfrm_init_replay(struct xfrm_state *x);
1541u32 __xfrm_state_mtu(struct xfrm_state *x, int mtu);
1542u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1543int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1544int xfrm_init_state(struct xfrm_state *x);
 
1545int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1546int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1547int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1548			 int (*finish)(struct net *, struct sock *,
1549				       struct sk_buff *));
1550int xfrm_trans_queue(struct sk_buff *skb,
1551		     int (*finish)(struct net *, struct sock *,
1552				   struct sk_buff *));
1553int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1554int xfrm_output(struct sock *sk, struct sk_buff *skb);
1555
1556#if IS_ENABLED(CONFIG_NET_PKTGEN)
1557int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1558#endif
1559
1560void xfrm_local_error(struct sk_buff *skb, int mtu);
 
1561int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1562int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1563		    int encap_type);
1564int xfrm4_transport_finish(struct sk_buff *skb, int async);
1565int xfrm4_rcv(struct sk_buff *skb);
1566
1567static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1568{
1569	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1570	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1571	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1572	return xfrm_input(skb, nexthdr, spi, 0);
1573}
1574
 
 
1575int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
 
 
1576int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1577int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1578int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1579int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1580void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
 
1581int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1582int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1583		  struct ip6_tnl *t);
1584int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1585		    int encap_type);
1586int xfrm6_transport_finish(struct sk_buff *skb, int async);
1587int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1588int xfrm6_rcv(struct sk_buff *skb);
1589int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1590		     xfrm_address_t *saddr, u8 proto);
1591void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
 
1592int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1593int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1594int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1595int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1596__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1597__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
 
 
1598int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
 
 
 
1599
1600#ifdef CONFIG_XFRM
1601void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1602int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1603int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1604int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1605		     int optlen);
1606#else
1607static inline int xfrm_user_policy(struct sock *sk, int optname,
1608				   sockptr_t optval, int optlen)
1609{
1610 	return -ENOPROTOOPT;
 
 
 
 
 
 
 
1611}
1612#endif
1613
1614struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1615				    const xfrm_address_t *saddr,
1616				    const xfrm_address_t *daddr,
1617				    int family, u32 mark);
1618
1619struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1620
1621void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1622int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1623		     int (*func)(struct xfrm_policy *, int, int, void*),
1624		     void *);
1625void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1626int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1627struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1628					  const struct xfrm_mark *mark,
1629					  u32 if_id, u8 type, int dir,
1630					  struct xfrm_selector *sel,
1631					  struct xfrm_sec_ctx *ctx, int delete,
1632					  int *err);
1633struct xfrm_policy *xfrm_policy_byid(struct net *net,
1634				     const struct xfrm_mark *mark, u32 if_id,
1635				     u8 type, int dir, u32 id, int delete,
1636				     int *err);
1637int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1638void xfrm_policy_hash_rebuild(struct net *net);
1639u32 xfrm_get_acqseq(void);
1640int verify_spi_info(u8 proto, u32 min, u32 max);
1641int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1642struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1643				 u8 mode, u32 reqid, u32 if_id, u8 proto,
1644				 const xfrm_address_t *daddr,
1645				 const xfrm_address_t *saddr, int create,
1646				 unsigned short family);
1647int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1648
1649#ifdef CONFIG_XFRM_MIGRATE
1650int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1651	       const struct xfrm_migrate *m, int num_bundles,
1652	       const struct xfrm_kmaddress *k,
1653	       const struct xfrm_encap_tmpl *encap);
1654struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1655struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1656				      struct xfrm_migrate *m,
1657				      struct xfrm_encap_tmpl *encap);
1658int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1659		 struct xfrm_migrate *m, int num_bundles,
1660		 struct xfrm_kmaddress *k, struct net *net,
1661		 struct xfrm_encap_tmpl *encap);
1662#endif
1663
1664int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1665void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1666int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1667	      xfrm_address_t *addr);
1668
1669void xfrm_input_init(void);
1670int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1671
1672void xfrm_probe_algs(void);
1673int xfrm_count_pfkey_auth_supported(void);
1674int xfrm_count_pfkey_enc_supported(void);
1675struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1676struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1677struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1678struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1679struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1680struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1681struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1682struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1683struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1684					    int probe);
1685
1686static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1687				    const xfrm_address_t *b)
1688{
1689	return ipv6_addr_equal((const struct in6_addr *)a,
1690			       (const struct in6_addr *)b);
1691}
1692
1693static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1694				   const xfrm_address_t *b,
1695				   sa_family_t family)
1696{
1697	switch (family) {
1698	default:
1699	case AF_INET:
1700		return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1701	case AF_INET6:
1702		return xfrm6_addr_equal(a, b);
1703	}
1704}
1705
1706static inline int xfrm_policy_id2dir(u32 index)
1707{
1708	return index & 7;
1709}
1710
1711#ifdef CONFIG_XFRM
1712void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1713int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1714void xfrm_replay_notify(struct xfrm_state *x, int event);
1715int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1716int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1717
1718static inline int xfrm_aevent_is_on(struct net *net)
1719{
1720	struct sock *nlsk;
1721	int ret = 0;
1722
1723	rcu_read_lock();
1724	nlsk = rcu_dereference(net->xfrm.nlsk);
1725	if (nlsk)
1726		ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1727	rcu_read_unlock();
1728	return ret;
1729}
1730
1731static inline int xfrm_acquire_is_on(struct net *net)
1732{
1733	struct sock *nlsk;
1734	int ret = 0;
1735
1736	rcu_read_lock();
1737	nlsk = rcu_dereference(net->xfrm.nlsk);
1738	if (nlsk)
1739		ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1740	rcu_read_unlock();
1741
1742	return ret;
1743}
1744#endif
1745
1746static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1747{
1748	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1749}
1750
1751static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1752{
1753	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1754}
1755
1756static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1757{
1758	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1759}
1760
1761static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1762{
1763	return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1764}
1765
1766#ifdef CONFIG_XFRM_MIGRATE
1767static inline int xfrm_replay_clone(struct xfrm_state *x,
1768				     struct xfrm_state *orig)
1769{
1770
1771	x->replay_esn = kmemdup(orig->replay_esn,
1772				xfrm_replay_state_esn_len(orig->replay_esn),
1773				GFP_KERNEL);
1774	if (!x->replay_esn)
1775		return -ENOMEM;
1776	x->preplay_esn = kmemdup(orig->preplay_esn,
1777				 xfrm_replay_state_esn_len(orig->preplay_esn),
 
 
 
 
1778				 GFP_KERNEL);
1779	if (!x->preplay_esn)
 
1780		return -ENOMEM;
 
1781
1782	return 0;
1783}
1784
1785static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1786{
1787	return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1788}
1789
1790
1791static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1792{
1793	return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1794}
1795
1796static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1797{
1798	return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1799}
1800
1801static inline void xfrm_states_put(struct xfrm_state **states, int n)
1802{
1803	int i;
1804	for (i = 0; i < n; i++)
1805		xfrm_state_put(*(states + i));
1806}
1807
1808static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1809{
1810	int i;
1811	for (i = 0; i < n; i++)
1812		xfrm_state_delete(*(states + i));
1813}
1814#endif
1815
1816#ifdef CONFIG_XFRM
1817static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1818{
1819	struct sec_path *sp = skb_sec_path(skb);
1820
1821	return sp->xvec[sp->len - 1];
1822}
1823#endif
1824
1825static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1826{
1827#ifdef CONFIG_XFRM
1828	struct sec_path *sp = skb_sec_path(skb);
1829
1830	if (!sp || !sp->olen || sp->len != sp->olen)
1831		return NULL;
1832
1833	return &sp->ovec[sp->olen - 1];
1834#else
1835	return NULL;
1836#endif
1837}
1838
1839void __init xfrm_dev_init(void);
1840
1841#ifdef CONFIG_XFRM_OFFLOAD
1842void xfrm_dev_resume(struct sk_buff *skb);
1843void xfrm_dev_backlog(struct softnet_data *sd);
1844struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1845int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1846		       struct xfrm_user_offload *xuo);
1847bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1848
1849static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1850{
1851	struct xfrm_state_offload *xso = &x->xso;
1852
1853	if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1854		xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1855}
1856
1857static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1858{
1859	struct xfrm_state *x = dst->xfrm;
1860	struct xfrm_dst *xdst;
1861
1862	if (!x || !x->type_offload)
1863		return false;
1864
1865	xdst = (struct xfrm_dst *) dst;
1866	if (!x->xso.offload_handle && !xdst->child->xfrm)
1867		return true;
1868	if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1869	    !xdst->child->xfrm)
1870		return true;
1871
1872	return false;
1873}
1874
1875static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1876{
1877	struct xfrm_state_offload *xso = &x->xso;
1878
1879	if (xso->dev)
1880		xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1881}
1882
1883static inline void xfrm_dev_state_free(struct xfrm_state *x)
1884{
1885	struct xfrm_state_offload *xso = &x->xso;
1886	struct net_device *dev = xso->dev;
1887
1888	if (dev && dev->xfrmdev_ops) {
1889		if (dev->xfrmdev_ops->xdo_dev_state_free)
1890			dev->xfrmdev_ops->xdo_dev_state_free(x);
1891		xso->dev = NULL;
1892		dev_put(dev);
1893	}
1894}
1895#else
1896static inline void xfrm_dev_resume(struct sk_buff *skb)
1897{
1898}
1899
1900static inline void xfrm_dev_backlog(struct softnet_data *sd)
1901{
1902}
1903
1904static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1905{
1906	return skb;
1907}
1908
1909static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1910{
1911	return 0;
1912}
1913
1914static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1915{
1916}
1917
1918static inline void xfrm_dev_state_free(struct xfrm_state *x)
1919{
1920}
1921
1922static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1923{
1924	return false;
1925}
1926
1927static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1928{
1929}
1930
1931static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1932{
1933	return false;
1934}
1935#endif
1936
1937static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1938{
1939	if (attrs[XFRMA_MARK])
1940		memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1941	else
1942		m->v = m->m = 0;
1943
1944	return m->v & m->m;
1945}
1946
1947static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1948{
1949	int ret = 0;
1950
1951	if (m->m | m->v)
1952		ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1953	return ret;
1954}
1955
1956static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1957{
1958	struct xfrm_mark *m = &x->props.smark;
1959
1960	return (m->v & m->m) | (mark & ~m->m);
1961}
1962
1963static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1964{
1965	int ret = 0;
1966
1967	if (if_id)
1968		ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1969	return ret;
1970}
1971
1972static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1973				    unsigned int family)
1974{
1975	bool tunnel = false;
1976
1977	switch(family) {
1978	case AF_INET:
1979		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1980			tunnel = true;
1981		break;
1982	case AF_INET6:
1983		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1984			tunnel = true;
1985		break;
1986	}
1987	if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1988		return -EINVAL;
1989
1990	return 0;
1991}
1992
1993extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
1994extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1995
1996struct xfrm_translator {
1997	/* Allocate frag_list and put compat translation there */
1998	int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
1999
2000	/* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2001	struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2002			int maxtype, const struct nla_policy *policy,
2003			struct netlink_ext_ack *extack);
2004
2005	/* Translate 32-bit user_policy from sockptr */
2006	int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2007
2008	struct module *owner;
2009};
2010
2011#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2012extern int xfrm_register_translator(struct xfrm_translator *xtr);
2013extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2014extern struct xfrm_translator *xfrm_get_translator(void);
2015extern void xfrm_put_translator(struct xfrm_translator *xtr);
2016#else
2017static inline struct xfrm_translator *xfrm_get_translator(void)
2018{
2019	return NULL;
2020}
2021static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2022{
2023}
2024#endif
2025
2026#if IS_ENABLED(CONFIG_IPV6)
2027static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2028{
2029	int proto;
2030
2031	if (!sk || sk->sk_family != AF_INET6)
2032		return false;
2033
2034	proto = sk->sk_protocol;
2035	if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2036		return inet6_sk(sk)->dontfrag;
2037
2038	return false;
2039}
2040#endif
2041#endif	/* _NET_XFRM_H */