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
 129enum {
 130	XFRM_DEV_OFFLOAD_IN = 1,
 131	XFRM_DEV_OFFLOAD_OUT,
 132	XFRM_DEV_OFFLOAD_FWD,
 133};
 134
 135enum {
 136	XFRM_DEV_OFFLOAD_UNSPECIFIED,
 137	XFRM_DEV_OFFLOAD_CRYPTO,
 138	XFRM_DEV_OFFLOAD_PACKET,
 139};
 140
 141enum {
 142	XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
 143};
 144
 145struct xfrm_dev_offload {
 146	struct net_device	*dev;
 147	netdevice_tracker	dev_tracker;
 148	struct net_device	*real_dev;
 149	unsigned long		offload_handle;
 150	u8			dir : 2;
 151	u8			type : 2;
 152	u8			flags : 2;
 153};
 154
 155struct xfrm_mode {
 156	u8 encap;
 157	u8 family;
 158	u8 flags;
 159};
 160
 161/* Flags for xfrm_mode. */
 162enum {
 163	XFRM_MODE_FLAG_TUNNEL = 1,
 164};
 165
 166enum xfrm_replay_mode {
 167	XFRM_REPLAY_MODE_LEGACY,
 168	XFRM_REPLAY_MODE_BMP,
 169	XFRM_REPLAY_MODE_ESN,
 170};
 171
 172/* Full description of state of transformer. */
 173struct xfrm_state {
 174	possible_net_t		xs_net;
 175	union {
 176		struct hlist_node	gclist;
 177		struct hlist_node	bydst;
 178	};
 179	struct hlist_node	bysrc;
 180	struct hlist_node	byspi;
 181	struct hlist_node	byseq;
 182
 183	refcount_t		refcnt;
 184	spinlock_t		lock;
 185
 186	struct xfrm_id		id;
 187	struct xfrm_selector	sel;
 188	struct xfrm_mark	mark;
 189	u32			if_id;
 190	u32			tfcpad;
 191
 192	u32			genid;
 193
 194	/* Key manager bits */
 195	struct xfrm_state_walk	km;
 196
 197	/* Parameters of this state. */
 198	struct {
 199		u32		reqid;
 200		u8		mode;
 201		u8		replay_window;
 202		u8		aalgo, ealgo, calgo;
 203		u8		flags;
 204		u16		family;
 205		xfrm_address_t	saddr;
 206		int		header_len;
 207		int		trailer_len;
 208		u32		extra_flags;
 209		struct xfrm_mark	smark;
 210	} props;
 211
 212	struct xfrm_lifetime_cfg lft;
 213
 214	/* Data for transformer */
 215	struct xfrm_algo_auth	*aalg;
 216	struct xfrm_algo	*ealg;
 217	struct xfrm_algo	*calg;
 218	struct xfrm_algo_aead	*aead;
 219	const char		*geniv;
 220
 221	/* mapping change rate limiting */
 222	__be16 new_mapping_sport;
 223	u32 new_mapping;	/* seconds */
 224	u32 mapping_maxage;	/* seconds for input SA */
 225
 226	/* Data for encapsulator */
 227	struct xfrm_encap_tmpl	*encap;
 228	struct sock __rcu	*encap_sk;
 229
 230	/* Data for care-of address */
 231	xfrm_address_t	*coaddr;
 232
 233	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
 234	struct xfrm_state	*tunnel;
 235
 236	/* If a tunnel, number of users + 1 */
 237	atomic_t		tunnel_users;
 238
 239	/* State for replay detection */
 240	struct xfrm_replay_state replay;
 241	struct xfrm_replay_state_esn *replay_esn;
 242
 243	/* Replay detection state at the time we sent the last notification */
 244	struct xfrm_replay_state preplay;
 245	struct xfrm_replay_state_esn *preplay_esn;
 246
 247	/* replay detection mode */
 248	enum xfrm_replay_mode    repl_mode;
 249	/* internal flag that only holds state for delayed aevent at the
 250	 * moment
 251	*/
 252	u32			xflags;
 253
 254	/* Replay detection notification settings */
 255	u32			replay_maxage;
 256	u32			replay_maxdiff;
 257
 258	/* Replay detection notification timer */
 259	struct timer_list	rtimer;
 260
 261	/* Statistics */
 262	struct xfrm_stats	stats;
 263
 264	struct xfrm_lifetime_cur curlft;
 265	struct hrtimer		mtimer;
 266
 267	struct xfrm_dev_offload xso;
 268
 269	/* used to fix curlft->add_time when changing date */
 270	long		saved_tmo;
 271
 272	/* Last used time */
 273	time64_t		lastused;
 274
 275	struct page_frag xfrag;
 276
 277	/* Reference to data common to all the instances of this
 278	 * transformer. */
 279	const struct xfrm_type	*type;
 280	struct xfrm_mode	inner_mode;
 281	struct xfrm_mode	inner_mode_iaf;
 282	struct xfrm_mode	outer_mode;
 283
 284	const struct xfrm_type_offload	*type_offload;
 285
 286	/* Security context */
 287	struct xfrm_sec_ctx	*security;
 288
 289	/* Private data of this transformer, format is opaque,
 290	 * interpreted by xfrm_type methods. */
 291	void			*data;
 292};
 293
 294static inline struct net *xs_net(struct xfrm_state *x)
 295{
 296	return read_pnet(&x->xs_net);
 297}
 298
 299/* xflags - make enum if more show up */
 300#define XFRM_TIME_DEFER	1
 301#define XFRM_SOFT_EXPIRE 2
 302
 303enum {
 304	XFRM_STATE_VOID,
 305	XFRM_STATE_ACQ,
 306	XFRM_STATE_VALID,
 307	XFRM_STATE_ERROR,
 308	XFRM_STATE_EXPIRED,
 309	XFRM_STATE_DEAD
 310};
 311
 312/* callback structure passed from either netlink or pfkey */
 313struct km_event {
 314	union {
 315		u32 hard;
 316		u32 proto;
 317		u32 byid;
 318		u32 aevent;
 319		u32 type;
 320	} data;
 321
 322	u32	seq;
 323	u32	portid;
 324	u32	event;
 325	struct net *net;
 326};
 327
 328struct xfrm_if_decode_session_result {
 329	struct net *net;
 330	u32 if_id;
 331};
 332
 333struct xfrm_if_cb {
 334	bool (*decode_session)(struct sk_buff *skb,
 335			       unsigned short family,
 336			       struct xfrm_if_decode_session_result *res);
 337};
 338
 339void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
 340void xfrm_if_unregister_cb(void);
 341
 342struct net_device;
 343struct xfrm_type;
 344struct xfrm_dst;
 345struct xfrm_policy_afinfo {
 346	struct dst_ops		*dst_ops;
 347	struct dst_entry	*(*dst_lookup)(struct net *net,
 348					       int tos, int oif,
 349					       const xfrm_address_t *saddr,
 350					       const xfrm_address_t *daddr,
 351					       u32 mark);
 352	int			(*get_saddr)(struct net *net, int oif,
 353					     xfrm_address_t *saddr,
 354					     xfrm_address_t *daddr,
 355					     u32 mark);
 356	int			(*fill_dst)(struct xfrm_dst *xdst,
 357					    struct net_device *dev,
 358					    const struct flowi *fl);
 359	struct dst_entry	*(*blackhole_route)(struct net *net, struct dst_entry *orig);
 360};
 361
 362int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
 363void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
 364void km_policy_notify(struct xfrm_policy *xp, int dir,
 365		      const struct km_event *c);
 366void km_state_notify(struct xfrm_state *x, const struct km_event *c);
 367
 368struct xfrm_tmpl;
 369int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
 370	     struct xfrm_policy *pol);
 371void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 372int __xfrm_state_delete(struct xfrm_state *x);
 373
 374struct xfrm_state_afinfo {
 375	u8				family;
 376	u8				proto;
 377
 378	const struct xfrm_type_offload *type_offload_esp;
 379
 380	const struct xfrm_type		*type_esp;
 381	const struct xfrm_type		*type_ipip;
 382	const struct xfrm_type		*type_ipip6;
 383	const struct xfrm_type		*type_comp;
 384	const struct xfrm_type		*type_ah;
 385	const struct xfrm_type		*type_routing;
 386	const struct xfrm_type		*type_dstopts;
 387
 388	int			(*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
 389	int			(*transport_finish)(struct sk_buff *skb,
 390						    int async);
 391	void			(*local_error)(struct sk_buff *skb, u32 mtu);
 392};
 393
 394int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 395int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 396struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
 397struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
 398
 399struct xfrm_input_afinfo {
 400	u8			family;
 401	bool			is_ipip;
 402	int			(*callback)(struct sk_buff *skb, u8 protocol,
 403					    int err);
 404};
 405
 406int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
 407int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
 408
 409void xfrm_flush_gc(void);
 410void xfrm_state_delete_tunnel(struct xfrm_state *x);
 411
 412struct xfrm_type {
 413	struct module		*owner;
 414	u8			proto;
 415	u8			flags;
 416#define XFRM_TYPE_NON_FRAGMENT	1
 417#define XFRM_TYPE_REPLAY_PROT	2
 418#define XFRM_TYPE_LOCAL_COADDR	4
 419#define XFRM_TYPE_REMOTE_COADDR	8
 420
 421	int			(*init_state)(struct xfrm_state *x,
 422					      struct netlink_ext_ack *extack);
 423	void			(*destructor)(struct xfrm_state *);
 424	int			(*input)(struct xfrm_state *, struct sk_buff *skb);
 425	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
 426	int			(*reject)(struct xfrm_state *, struct sk_buff *,
 427					  const struct flowi *);
 428};
 429
 430int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 431void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 432
 433struct xfrm_type_offload {
 434	struct module	*owner;
 435	u8		proto;
 436	void		(*encap)(struct xfrm_state *, struct sk_buff *pskb);
 437	int		(*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
 438	int		(*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
 439};
 440
 441int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
 442void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
 443
 444static inline int xfrm_af2proto(unsigned int family)
 445{
 446	switch(family) {
 447	case AF_INET:
 448		return IPPROTO_IPIP;
 449	case AF_INET6:
 450		return IPPROTO_IPV6;
 451	default:
 452		return 0;
 453	}
 454}
 455
 456static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 457{
 458	if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 459	    (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 460		return &x->inner_mode;
 461	else
 462		return &x->inner_mode_iaf;
 463}
 464
 465struct xfrm_tmpl {
 466/* id in template is interpreted as:
 467 * daddr - destination of tunnel, may be zero for transport mode.
 468 * spi   - zero to acquire spi. Not zero if spi is static, then
 469 *	   daddr must be fixed too.
 470 * proto - AH/ESP/IPCOMP
 471 */
 472	struct xfrm_id		id;
 473
 474/* Source address of tunnel. Ignored, if it is not a tunnel. */
 475	xfrm_address_t		saddr;
 476
 477	unsigned short		encap_family;
 478
 479	u32			reqid;
 480
 481/* Mode: transport, tunnel etc. */
 482	u8			mode;
 483
 484/* Sharing mode: unique, this session only, this user only etc. */
 485	u8			share;
 486
 487/* May skip this transfomration if no SA is found */
 488	u8			optional;
 489
 490/* Skip aalgos/ealgos/calgos checks. */
 491	u8			allalgs;
 492
 493/* Bit mask of algos allowed for acquisition */
 494	u32			aalgos;
 495	u32			ealgos;
 496	u32			calgos;
 497};
 498
 499#define XFRM_MAX_DEPTH		6
 500#define XFRM_MAX_OFFLOAD_DEPTH	1
 501
 502struct xfrm_policy_walk_entry {
 503	struct list_head	all;
 504	u8			dead;
 505};
 506
 507struct xfrm_policy_walk {
 508	struct xfrm_policy_walk_entry walk;
 509	u8 type;
 510	u32 seq;
 511};
 512
 513struct xfrm_policy_queue {
 514	struct sk_buff_head	hold_queue;
 515	struct timer_list	hold_timer;
 516	unsigned long		timeout;
 517};
 518
 519struct xfrm_policy {
 520	possible_net_t		xp_net;
 521	struct hlist_node	bydst;
 522	struct hlist_node	byidx;
 523
 524	/* This lock only affects elements except for entry. */
 525	rwlock_t		lock;
 526	refcount_t		refcnt;
 527	u32			pos;
 528	struct timer_list	timer;
 529
 530	atomic_t		genid;
 531	u32			priority;
 532	u32			index;
 533	u32			if_id;
 534	struct xfrm_mark	mark;
 535	struct xfrm_selector	selector;
 536	struct xfrm_lifetime_cfg lft;
 537	struct xfrm_lifetime_cur curlft;
 538	struct xfrm_policy_walk_entry walk;
 539	struct xfrm_policy_queue polq;
 540	bool                    bydst_reinsert;
 541	u8			type;
 542	u8			action;
 543	u8			flags;
 544	u8			xfrm_nr;
 545	u16			family;
 546	struct xfrm_sec_ctx	*security;
 547	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
 548	struct hlist_node	bydst_inexact_list;
 549	struct rcu_head		rcu;
 550
 551	struct xfrm_dev_offload xdo;
 552};
 553
 554static inline struct net *xp_net(const struct xfrm_policy *xp)
 555{
 556	return read_pnet(&xp->xp_net);
 557}
 558
 559struct xfrm_kmaddress {
 560	xfrm_address_t          local;
 561	xfrm_address_t          remote;
 562	u32			reserved;
 563	u16			family;
 564};
 565
 566struct xfrm_migrate {
 567	xfrm_address_t		old_daddr;
 568	xfrm_address_t		old_saddr;
 569	xfrm_address_t		new_daddr;
 570	xfrm_address_t		new_saddr;
 571	u8			proto;
 572	u8			mode;
 573	u16			reserved;
 574	u32			reqid;
 575	u16			old_family;
 576	u16			new_family;
 577};
 578
 579#define XFRM_KM_TIMEOUT                30
 580/* what happened */
 581#define XFRM_REPLAY_UPDATE	XFRM_AE_CR
 582#define XFRM_REPLAY_TIMEOUT	XFRM_AE_CE
 583
 584/* default aevent timeout in units of 100ms */
 585#define XFRM_AE_ETIME			10
 586/* Async Event timer multiplier */
 587#define XFRM_AE_ETH_M			10
 588/* default seq threshold size */
 589#define XFRM_AE_SEQT_SIZE		2
 590
 591struct xfrm_mgr {
 592	struct list_head	list;
 593	int			(*notify)(struct xfrm_state *x, const struct km_event *c);
 594	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
 595	struct xfrm_policy	*(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 596	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 597	int			(*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
 598	int			(*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 599	int			(*migrate)(const struct xfrm_selector *sel,
 600					   u8 dir, u8 type,
 601					   const struct xfrm_migrate *m,
 602					   int num_bundles,
 603					   const struct xfrm_kmaddress *k,
 604					   const struct xfrm_encap_tmpl *encap);
 605	bool			(*is_alive)(const struct km_event *c);
 606};
 607
 608void xfrm_register_km(struct xfrm_mgr *km);
 609void xfrm_unregister_km(struct xfrm_mgr *km);
 610
 611struct xfrm_tunnel_skb_cb {
 612	union {
 613		struct inet_skb_parm h4;
 614		struct inet6_skb_parm h6;
 615	} header;
 616
 617	union {
 618		struct ip_tunnel *ip4;
 619		struct ip6_tnl *ip6;
 620	} tunnel;
 621};
 622
 623#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
 624
 625/*
 626 * This structure is used for the duration where packets are being
 627 * transformed by IPsec.  As soon as the packet leaves IPsec the
 628 * area beyond the generic IP part may be overwritten.
 629 */
 630struct xfrm_skb_cb {
 631	struct xfrm_tunnel_skb_cb header;
 632
 633        /* Sequence number for replay protection. */
 634	union {
 635		struct {
 636			__u32 low;
 637			__u32 hi;
 638		} output;
 639		struct {
 640			__be32 low;
 641			__be32 hi;
 642		} input;
 643	} seq;
 644};
 645
 646#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 647
 648/*
 649 * This structure is used by the afinfo prepare_input/prepare_output functions
 650 * to transmit header information to the mode input/output functions.
 651 */
 652struct xfrm_mode_skb_cb {
 653	struct xfrm_tunnel_skb_cb header;
 654
 655	/* Copied from header for IPv4, always set to zero and DF for IPv6. */
 656	__be16 id;
 657	__be16 frag_off;
 658
 659	/* IP header length (excluding options or extension headers). */
 660	u8 ihl;
 661
 662	/* TOS for IPv4, class for IPv6. */
 663	u8 tos;
 664
 665	/* TTL for IPv4, hop limitfor IPv6. */
 666	u8 ttl;
 667
 668	/* Protocol for IPv4, NH for IPv6. */
 669	u8 protocol;
 670
 671	/* Option length for IPv4, zero for IPv6. */
 672	u8 optlen;
 673
 674	/* Used by IPv6 only, zero for IPv4. */
 675	u8 flow_lbl[3];
 676};
 677
 678#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 679
 680/*
 681 * This structure is used by the input processing to locate the SPI and
 682 * related information.
 683 */
 684struct xfrm_spi_skb_cb {
 685	struct xfrm_tunnel_skb_cb header;
 686
 687	unsigned int daddroff;
 688	unsigned int family;
 689	__be32 seq;
 690};
 691
 692#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 693
 694#ifdef CONFIG_AUDITSYSCALL
 695static inline struct audit_buffer *xfrm_audit_start(const char *op)
 696{
 697	struct audit_buffer *audit_buf = NULL;
 698
 699	if (audit_enabled == AUDIT_OFF)
 700		return NULL;
 701	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
 702				    AUDIT_MAC_IPSEC_EVENT);
 703	if (audit_buf == NULL)
 704		return NULL;
 705	audit_log_format(audit_buf, "op=%s", op);
 706	return audit_buf;
 707}
 708
 709static inline void xfrm_audit_helper_usrinfo(bool task_valid,
 710					     struct audit_buffer *audit_buf)
 711{
 712	const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
 713					    audit_get_loginuid(current) :
 714					    INVALID_UID);
 715	const unsigned int ses = task_valid ? audit_get_sessionid(current) :
 716		AUDIT_SID_UNSET;
 717
 718	audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 719	audit_log_task_context(audit_buf);
 720}
 721
 722void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
 723void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 724			      bool task_valid);
 725void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
 726void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
 727void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 728				      struct sk_buff *skb);
 729void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
 730			     __be32 net_seq);
 731void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 732void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
 733			       __be32 net_seq);
 734void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
 735			      u8 proto);
 736#else
 737
 738static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 739					 bool task_valid)
 740{
 741}
 742
 743static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 744					    bool task_valid)
 745{
 746}
 747
 748static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 749					bool task_valid)
 750{
 751}
 752
 753static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 754					   bool task_valid)
 755{
 756}
 757
 758static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 759					     struct sk_buff *skb)
 760{
 761}
 762
 763static inline void xfrm_audit_state_replay(struct xfrm_state *x,
 764					   struct sk_buff *skb, __be32 net_seq)
 765{
 766}
 767
 768static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 769				      u16 family)
 770{
 771}
 772
 773static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 774				      __be32 net_spi, __be32 net_seq)
 775{
 776}
 777
 778static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 779				     struct sk_buff *skb, u8 proto)
 780{
 781}
 782#endif /* CONFIG_AUDITSYSCALL */
 783
 784static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 785{
 786	if (likely(policy != NULL))
 787		refcount_inc(&policy->refcnt);
 788}
 789
 790void xfrm_policy_destroy(struct xfrm_policy *policy);
 791
 792static inline void xfrm_pol_put(struct xfrm_policy *policy)
 793{
 794	if (refcount_dec_and_test(&policy->refcnt))
 795		xfrm_policy_destroy(policy);
 796}
 797
 798static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 799{
 800	int i;
 801	for (i = npols - 1; i >= 0; --i)
 802		xfrm_pol_put(pols[i]);
 803}
 804
 805void __xfrm_state_destroy(struct xfrm_state *, bool);
 806
 807static inline void __xfrm_state_put(struct xfrm_state *x)
 808{
 809	refcount_dec(&x->refcnt);
 810}
 811
 812static inline void xfrm_state_put(struct xfrm_state *x)
 813{
 814	if (refcount_dec_and_test(&x->refcnt))
 815		__xfrm_state_destroy(x, false);
 816}
 817
 818static inline void xfrm_state_put_sync(struct xfrm_state *x)
 819{
 820	if (refcount_dec_and_test(&x->refcnt))
 821		__xfrm_state_destroy(x, true);
 822}
 823
 824static inline void xfrm_state_hold(struct xfrm_state *x)
 825{
 826	refcount_inc(&x->refcnt);
 827}
 828
 829static inline bool addr_match(const void *token1, const void *token2,
 830			      unsigned int prefixlen)
 831{
 832	const __be32 *a1 = token1;
 833	const __be32 *a2 = token2;
 834	unsigned int pdw;
 835	unsigned int pbi;
 836
 837	pdw = prefixlen >> 5;	  /* num of whole u32 in prefix */
 838	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 839
 840	if (pdw)
 841		if (memcmp(a1, a2, pdw << 2))
 842			return false;
 843
 844	if (pbi) {
 845		__be32 mask;
 846
 847		mask = htonl((0xffffffff) << (32 - pbi));
 848
 849		if ((a1[pdw] ^ a2[pdw]) & mask)
 850			return false;
 851	}
 852
 853	return true;
 854}
 855
 856static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
 857{
 858	/* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
 859	if (sizeof(long) == 4 && prefixlen == 0)
 860		return true;
 861	return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
 862}
 863
 864static __inline__
 865__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
 866{
 867	__be16 port;
 868	switch(fl->flowi_proto) {
 869	case IPPROTO_TCP:
 870	case IPPROTO_UDP:
 871	case IPPROTO_UDPLITE:
 872	case IPPROTO_SCTP:
 873		port = uli->ports.sport;
 874		break;
 875	case IPPROTO_ICMP:
 876	case IPPROTO_ICMPV6:
 877		port = htons(uli->icmpt.type);
 878		break;
 879	case IPPROTO_MH:
 880		port = htons(uli->mht.type);
 881		break;
 882	case IPPROTO_GRE:
 883		port = htons(ntohl(uli->gre_key) >> 16);
 884		break;
 885	default:
 886		port = 0;	/*XXX*/
 887	}
 888	return port;
 889}
 890
 891static __inline__
 892__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
 893{
 894	__be16 port;
 895	switch(fl->flowi_proto) {
 896	case IPPROTO_TCP:
 897	case IPPROTO_UDP:
 898	case IPPROTO_UDPLITE:
 899	case IPPROTO_SCTP:
 900		port = uli->ports.dport;
 901		break;
 902	case IPPROTO_ICMP:
 903	case IPPROTO_ICMPV6:
 904		port = htons(uli->icmpt.code);
 905		break;
 906	case IPPROTO_GRE:
 907		port = htons(ntohl(uli->gre_key) & 0xffff);
 908		break;
 909	default:
 910		port = 0;	/*XXX*/
 911	}
 912	return port;
 913}
 914
 915bool xfrm_selector_match(const struct xfrm_selector *sel,
 916			 const struct flowi *fl, unsigned short family);
 917
 918#ifdef CONFIG_SECURITY_NETWORK_XFRM
 919/*	If neither has a context --> match
 920 * 	Otherwise, both must have a context and the sids, doi, alg must match
 921 */
 922static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 923{
 924	return ((!s1 && !s2) ||
 925		(s1 && s2 &&
 926		 (s1->ctx_sid == s2->ctx_sid) &&
 927		 (s1->ctx_doi == s2->ctx_doi) &&
 928		 (s1->ctx_alg == s2->ctx_alg)));
 929}
 930#else
 931static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 932{
 933	return true;
 934}
 935#endif
 936
 937/* A struct encoding bundle of transformations to apply to some set of flow.
 938 *
 939 * xdst->child points to the next element of bundle.
 940 * dst->xfrm  points to an instanse of transformer.
 941 *
 942 * Due to unfortunate limitations of current routing cache, which we
 943 * have no time to fix, it mirrors struct rtable and bound to the same
 944 * routing key, including saddr,daddr. However, we can have many of
 945 * bundles differing by session id. All the bundles grow from a parent
 946 * policy rule.
 947 */
 948struct xfrm_dst {
 949	union {
 950		struct dst_entry	dst;
 951		struct rtable		rt;
 952		struct rt6_info		rt6;
 953	} u;
 954	struct dst_entry *route;
 955	struct dst_entry *child;
 956	struct dst_entry *path;
 957	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
 958	int num_pols, num_xfrms;
 959	u32 xfrm_genid;
 960	u32 policy_genid;
 961	u32 route_mtu_cached;
 962	u32 child_mtu_cached;
 963	u32 route_cookie;
 964	u32 path_cookie;
 965};
 966
 967static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
 968{
 969#ifdef CONFIG_XFRM
 970	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
 971		const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
 972
 973		return xdst->path;
 974	}
 975#endif
 976	return (struct dst_entry *) dst;
 977}
 978
 979static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
 980{
 981#ifdef CONFIG_XFRM
 982	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
 983		struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
 984		return xdst->child;
 985	}
 986#endif
 987	return NULL;
 988}
 989
 990#ifdef CONFIG_XFRM
 991static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
 992{
 993	xdst->child = child;
 994}
 995
 996static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 997{
 998	xfrm_pols_put(xdst->pols, xdst->num_pols);
 999	dst_release(xdst->route);
1000	if (likely(xdst->u.dst.xfrm))
1001		xfrm_state_put(xdst->u.dst.xfrm);
1002}
1003#endif
1004
1005void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1006
1007struct xfrm_if_parms {
1008	int link;		/* ifindex of underlying L2 interface */
1009	u32 if_id;		/* interface identifyer */
1010	bool collect_md;
1011};
1012
1013struct xfrm_if {
1014	struct xfrm_if __rcu *next;	/* next interface in list */
1015	struct net_device *dev;		/* virtual device associated with interface */
1016	struct net *net;		/* netns for packet i/o */
1017	struct xfrm_if_parms p;		/* interface parms */
1018
1019	struct gro_cells gro_cells;
1020};
1021
1022struct xfrm_offload {
1023	/* Output sequence number for replay protection on offloading. */
1024	struct {
1025		__u32 low;
1026		__u32 hi;
1027	} seq;
1028
1029	__u32			flags;
1030#define	SA_DELETE_REQ		1
1031#define	CRYPTO_DONE		2
1032#define	CRYPTO_NEXT_DONE	4
1033#define	CRYPTO_FALLBACK		8
1034#define	XFRM_GSO_SEGMENT	16
1035#define	XFRM_GRO		32
1036/* 64 is free */
1037#define	XFRM_DEV_RESUME		128
1038#define	XFRM_XMIT		256
1039
1040	__u32			status;
1041#define CRYPTO_SUCCESS				1
1042#define CRYPTO_GENERIC_ERROR			2
1043#define CRYPTO_TRANSPORT_AH_AUTH_FAILED		4
1044#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED	8
1045#define CRYPTO_TUNNEL_AH_AUTH_FAILED		16
1046#define CRYPTO_TUNNEL_ESP_AUTH_FAILED		32
1047#define CRYPTO_INVALID_PACKET_SYNTAX		64
1048#define CRYPTO_INVALID_PROTOCOL			128
1049
1050	__u8			proto;
1051	__u8			inner_ipproto;
1052};
1053
1054struct sec_path {
1055	int			len;
1056	int			olen;
1057	int			verified_cnt;
1058
1059	struct xfrm_state	*xvec[XFRM_MAX_DEPTH];
1060	struct xfrm_offload	ovec[XFRM_MAX_OFFLOAD_DEPTH];
1061};
1062
1063struct sec_path *secpath_set(struct sk_buff *skb);
1064
1065static inline void
1066secpath_reset(struct sk_buff *skb)
1067{
1068#ifdef CONFIG_XFRM
1069	skb_ext_del(skb, SKB_EXT_SEC_PATH);
1070#endif
1071}
1072
1073static inline int
1074xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1075{
1076	switch (family) {
1077	case AF_INET:
1078		return addr->a4 == 0;
1079	case AF_INET6:
1080		return ipv6_addr_any(&addr->in6);
1081	}
1082	return 0;
1083}
1084
1085static inline int
1086__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1087{
1088	return	(tmpl->saddr.a4 &&
1089		 tmpl->saddr.a4 != x->props.saddr.a4);
1090}
1091
1092static inline int
1093__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1094{
1095	return	(!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1096		 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1097}
1098
1099static inline int
1100xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1101{
1102	switch (family) {
1103	case AF_INET:
1104		return __xfrm4_state_addr_cmp(tmpl, x);
1105	case AF_INET6:
1106		return __xfrm6_state_addr_cmp(tmpl, x);
1107	}
1108	return !0;
1109}
1110
1111#ifdef CONFIG_XFRM
1112static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1113{
1114	struct sec_path *sp = skb_sec_path(skb);
1115
1116	return sp->xvec[sp->len - 1];
1117}
1118#endif
1119
1120static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1121{
1122#ifdef CONFIG_XFRM
1123	struct sec_path *sp = skb_sec_path(skb);
1124
1125	if (!sp || !sp->olen || sp->len != sp->olen)
1126		return NULL;
1127
1128	return &sp->ovec[sp->olen - 1];
1129#else
1130	return NULL;
1131#endif
1132}
1133
1134#ifdef CONFIG_XFRM
1135int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1136			unsigned short family);
1137
1138static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1139					 int dir)
1140{
1141	if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1142		return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1143
1144	return false;
1145}
1146
1147static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1148					     int dir, unsigned short family)
1149{
1150	if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1151		/* same dst may be used for traffic originating from
1152		 * devices with different policy settings.
1153		 */
1154		return IPCB(skb)->flags & IPSKB_NOPOLICY;
1155	}
1156	return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1157}
1158
1159static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1160				       struct sk_buff *skb,
1161				       unsigned int family, int reverse)
1162{
1163	struct net *net = dev_net(skb->dev);
1164	int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1165	struct xfrm_offload *xo = xfrm_offload(skb);
1166	struct xfrm_state *x;
1167
1168	if (sk && sk->sk_policy[XFRM_POLICY_IN])
1169		return __xfrm_policy_check(sk, ndir, skb, family);
1170
1171	if (xo) {
1172		x = xfrm_input_state(skb);
1173		if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1174			return (xo->flags & CRYPTO_DONE) &&
1175			       (xo->status & CRYPTO_SUCCESS);
1176	}
1177
1178	return __xfrm_check_nopolicy(net, skb, dir) ||
1179	       __xfrm_check_dev_nopolicy(skb, dir, family) ||
1180	       __xfrm_policy_check(sk, ndir, skb, family);
1181}
1182
1183static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1184{
1185	return __xfrm_policy_check2(sk, dir, skb, family, 0);
1186}
1187
1188static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1189{
1190	return xfrm_policy_check(sk, dir, skb, AF_INET);
1191}
1192
1193static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1194{
1195	return xfrm_policy_check(sk, dir, skb, AF_INET6);
1196}
1197
1198static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1199					     struct sk_buff *skb)
1200{
1201	return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1202}
1203
1204static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1205					     struct sk_buff *skb)
1206{
1207	return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1208}
1209
1210int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1211			  unsigned int family, int reverse);
1212
1213static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1214				      unsigned int family)
1215{
1216	return __xfrm_decode_session(net, skb, fl, family, 0);
1217}
1218
1219static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1220					      struct flowi *fl,
1221					      unsigned int family)
1222{
1223	return __xfrm_decode_session(net, skb, fl, family, 1);
1224}
1225
1226int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1227
1228static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1229{
1230	struct net *net = dev_net(skb->dev);
1231
1232	if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1233	    net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1234		return true;
1235
1236	return (skb_dst(skb)->flags & DST_NOXFRM) ||
1237	       __xfrm_route_forward(skb, family);
1238}
1239
1240static inline int xfrm4_route_forward(struct sk_buff *skb)
1241{
1242	return xfrm_route_forward(skb, AF_INET);
1243}
1244
1245static inline int xfrm6_route_forward(struct sk_buff *skb)
1246{
1247	return xfrm_route_forward(skb, AF_INET6);
1248}
1249
1250int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1251
1252static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1253{
1254	if (!sk_fullsock(osk))
1255		return 0;
1256	sk->sk_policy[0] = NULL;
1257	sk->sk_policy[1] = NULL;
1258	if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1259		return __xfrm_sk_clone_policy(sk, osk);
1260	return 0;
1261}
1262
1263int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1264
1265static inline void xfrm_sk_free_policy(struct sock *sk)
1266{
1267	struct xfrm_policy *pol;
1268
1269	pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1270	if (unlikely(pol != NULL)) {
1271		xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1272		sk->sk_policy[0] = NULL;
1273	}
1274	pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1275	if (unlikely(pol != NULL)) {
1276		xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1277		sk->sk_policy[1] = NULL;
1278	}
1279}
1280
1281#else
1282
1283static inline void xfrm_sk_free_policy(struct sock *sk) {}
1284static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1285static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1286static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1287static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1288{
1289	return 1;
1290}
1291static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1292{
1293	return 1;
1294}
1295static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1296{
1297	return 1;
1298}
1299static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1300					      struct flowi *fl,
1301					      unsigned int family)
1302{
1303	return -ENOSYS;
1304}
1305static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1306					     struct sk_buff *skb)
1307{
1308	return 1;
1309}
1310static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1311					     struct sk_buff *skb)
1312{
1313	return 1;
1314}
1315#endif
1316
1317static __inline__
1318xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1319{
1320	switch (family){
1321	case AF_INET:
1322		return (xfrm_address_t *)&fl->u.ip4.daddr;
1323	case AF_INET6:
1324		return (xfrm_address_t *)&fl->u.ip6.daddr;
1325	}
1326	return NULL;
1327}
1328
1329static __inline__
1330xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1331{
1332	switch (family){
1333	case AF_INET:
1334		return (xfrm_address_t *)&fl->u.ip4.saddr;
1335	case AF_INET6:
1336		return (xfrm_address_t *)&fl->u.ip6.saddr;
1337	}
1338	return NULL;
1339}
1340
1341static __inline__
1342void xfrm_flowi_addr_get(const struct flowi *fl,
1343			 xfrm_address_t *saddr, xfrm_address_t *daddr,
1344			 unsigned short family)
1345{
1346	switch(family) {
1347	case AF_INET:
1348		memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1349		memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1350		break;
1351	case AF_INET6:
1352		saddr->in6 = fl->u.ip6.saddr;
1353		daddr->in6 = fl->u.ip6.daddr;
1354		break;
1355	}
1356}
1357
1358static __inline__ int
1359__xfrm4_state_addr_check(const struct xfrm_state *x,
1360			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1361{
1362	if (daddr->a4 == x->id.daddr.a4 &&
1363	    (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1364		return 1;
1365	return 0;
1366}
1367
1368static __inline__ int
1369__xfrm6_state_addr_check(const struct xfrm_state *x,
1370			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1371{
1372	if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1373	    (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1374	     ipv6_addr_any((struct in6_addr *)saddr) ||
1375	     ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1376		return 1;
1377	return 0;
1378}
1379
1380static __inline__ int
1381xfrm_state_addr_check(const struct xfrm_state *x,
1382		      const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1383		      unsigned short family)
1384{
1385	switch (family) {
1386	case AF_INET:
1387		return __xfrm4_state_addr_check(x, daddr, saddr);
1388	case AF_INET6:
1389		return __xfrm6_state_addr_check(x, daddr, saddr);
1390	}
1391	return 0;
1392}
1393
1394static __inline__ int
1395xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1396			   unsigned short family)
1397{
1398	switch (family) {
1399	case AF_INET:
1400		return __xfrm4_state_addr_check(x,
1401						(const xfrm_address_t *)&fl->u.ip4.daddr,
1402						(const xfrm_address_t *)&fl->u.ip4.saddr);
1403	case AF_INET6:
1404		return __xfrm6_state_addr_check(x,
1405						(const xfrm_address_t *)&fl->u.ip6.daddr,
1406						(const xfrm_address_t *)&fl->u.ip6.saddr);
1407	}
1408	return 0;
1409}
1410
1411static inline int xfrm_state_kern(const struct xfrm_state *x)
1412{
1413	return atomic_read(&x->tunnel_users);
1414}
1415
1416static inline bool xfrm_id_proto_valid(u8 proto)
1417{
1418	switch (proto) {
1419	case IPPROTO_AH:
1420	case IPPROTO_ESP:
1421	case IPPROTO_COMP:
1422#if IS_ENABLED(CONFIG_IPV6)
1423	case IPPROTO_ROUTING:
1424	case IPPROTO_DSTOPTS:
1425#endif
1426		return true;
1427	default:
1428		return false;
1429	}
1430}
1431
1432/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1433static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1434{
1435	return (!userproto || proto == userproto ||
1436		(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1437						  proto == IPPROTO_ESP ||
1438						  proto == IPPROTO_COMP)));
1439}
1440
1441/*
1442 * xfrm algorithm information
1443 */
1444struct xfrm_algo_aead_info {
1445	char *geniv;
1446	u16 icv_truncbits;
1447};
1448
1449struct xfrm_algo_auth_info {
1450	u16 icv_truncbits;
1451	u16 icv_fullbits;
1452};
1453
1454struct xfrm_algo_encr_info {
1455	char *geniv;
1456	u16 blockbits;
1457	u16 defkeybits;
1458};
1459
1460struct xfrm_algo_comp_info {
1461	u16 threshold;
1462};
1463
1464struct xfrm_algo_desc {
1465	char *name;
1466	char *compat;
1467	u8 available:1;
1468	u8 pfkey_supported:1;
1469	union {
1470		struct xfrm_algo_aead_info aead;
1471		struct xfrm_algo_auth_info auth;
1472		struct xfrm_algo_encr_info encr;
1473		struct xfrm_algo_comp_info comp;
1474	} uinfo;
1475	struct sadb_alg desc;
1476};
1477
1478/* XFRM protocol handlers.  */
1479struct xfrm4_protocol {
1480	int (*handler)(struct sk_buff *skb);
1481	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1482			     int encap_type);
1483	int (*cb_handler)(struct sk_buff *skb, int err);
1484	int (*err_handler)(struct sk_buff *skb, u32 info);
1485
1486	struct xfrm4_protocol __rcu *next;
1487	int priority;
1488};
1489
1490struct xfrm6_protocol {
1491	int (*handler)(struct sk_buff *skb);
1492	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1493			     int encap_type);
1494	int (*cb_handler)(struct sk_buff *skb, int err);
1495	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1496			   u8 type, u8 code, int offset, __be32 info);
1497
1498	struct xfrm6_protocol __rcu *next;
1499	int priority;
1500};
1501
1502/* XFRM tunnel handlers.  */
1503struct xfrm_tunnel {
1504	int (*handler)(struct sk_buff *skb);
1505	int (*cb_handler)(struct sk_buff *skb, int err);
1506	int (*err_handler)(struct sk_buff *skb, u32 info);
1507
1508	struct xfrm_tunnel __rcu *next;
1509	int priority;
1510};
1511
1512struct xfrm6_tunnel {
1513	int (*handler)(struct sk_buff *skb);
1514	int (*cb_handler)(struct sk_buff *skb, int err);
1515	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1516			   u8 type, u8 code, int offset, __be32 info);
1517	struct xfrm6_tunnel __rcu *next;
1518	int priority;
1519};
1520
1521void xfrm_init(void);
1522void xfrm4_init(void);
1523int xfrm_state_init(struct net *net);
1524void xfrm_state_fini(struct net *net);
1525void xfrm4_state_init(void);
1526void xfrm4_protocol_init(void);
1527#ifdef CONFIG_XFRM
1528int xfrm6_init(void);
1529void xfrm6_fini(void);
1530int xfrm6_state_init(void);
1531void xfrm6_state_fini(void);
1532int xfrm6_protocol_init(void);
1533void xfrm6_protocol_fini(void);
1534#else
1535static inline int xfrm6_init(void)
1536{
1537	return 0;
1538}
1539static inline void xfrm6_fini(void)
1540{
1541	;
1542}
1543#endif
1544
1545#ifdef CONFIG_XFRM_STATISTICS
1546int xfrm_proc_init(struct net *net);
1547void xfrm_proc_fini(struct net *net);
1548#endif
1549
1550int xfrm_sysctl_init(struct net *net);
1551#ifdef CONFIG_SYSCTL
1552void xfrm_sysctl_fini(struct net *net);
1553#else
1554static inline void xfrm_sysctl_fini(struct net *net)
1555{
1556}
1557#endif
1558
1559void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1560			  struct xfrm_address_filter *filter);
1561int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1562		    int (*func)(struct xfrm_state *, int, void*), void *);
1563void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1564struct xfrm_state *xfrm_state_alloc(struct net *net);
1565void xfrm_state_free(struct xfrm_state *x);
1566struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1567				   const xfrm_address_t *saddr,
1568				   const struct flowi *fl,
1569				   struct xfrm_tmpl *tmpl,
1570				   struct xfrm_policy *pol, int *err,
1571				   unsigned short family, u32 if_id);
1572struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1573				       xfrm_address_t *daddr,
1574				       xfrm_address_t *saddr,
1575				       unsigned short family,
1576				       u8 mode, u8 proto, u32 reqid);
1577struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1578					      unsigned short family);
1579int xfrm_state_check_expire(struct xfrm_state *x);
1580#ifdef CONFIG_XFRM_OFFLOAD
1581static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x)
1582{
1583	struct xfrm_dev_offload *xdo = &x->xso;
1584	struct net_device *dev = xdo->dev;
1585
1586	if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1587		return;
1588
1589	if (dev && dev->xfrmdev_ops &&
1590	    dev->xfrmdev_ops->xdo_dev_state_update_curlft)
1591		dev->xfrmdev_ops->xdo_dev_state_update_curlft(x);
1592
1593}
1594#else
1595static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {}
1596#endif
1597void xfrm_state_insert(struct xfrm_state *x);
1598int xfrm_state_add(struct xfrm_state *x);
1599int xfrm_state_update(struct xfrm_state *x);
1600struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1601				     const xfrm_address_t *daddr, __be32 spi,
1602				     u8 proto, unsigned short family);
1603struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1604					    const xfrm_address_t *daddr,
1605					    const xfrm_address_t *saddr,
1606					    u8 proto,
1607					    unsigned short family);
1608#ifdef CONFIG_XFRM_SUB_POLICY
1609void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1610		    unsigned short family);
1611void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1612		     unsigned short family);
1613#else
1614static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1615				  int n, unsigned short family)
1616{
1617}
1618
1619static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1620				   int n, unsigned short family)
1621{
1622}
1623#endif
1624
1625struct xfrmk_sadinfo {
1626	u32 sadhcnt; /* current hash bkts */
1627	u32 sadhmcnt; /* max allowed hash bkts */
1628	u32 sadcnt; /* current running count */
1629};
1630
1631struct xfrmk_spdinfo {
1632	u32 incnt;
1633	u32 outcnt;
1634	u32 fwdcnt;
1635	u32 inscnt;
1636	u32 outscnt;
1637	u32 fwdscnt;
1638	u32 spdhcnt;
1639	u32 spdhmcnt;
1640};
1641
1642struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1643int xfrm_state_delete(struct xfrm_state *x);
1644int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1645int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1646int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1647			  bool task_valid);
1648void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1649void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1650u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1651int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1652u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1653int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1654		      struct netlink_ext_ack *extack);
1655int xfrm_init_state(struct xfrm_state *x);
1656int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1657int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1658int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1659			 int (*finish)(struct net *, struct sock *,
1660				       struct sk_buff *));
1661int xfrm_trans_queue(struct sk_buff *skb,
1662		     int (*finish)(struct net *, struct sock *,
1663				   struct sk_buff *));
1664int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1665int xfrm_output(struct sock *sk, struct sk_buff *skb);
1666
1667#if IS_ENABLED(CONFIG_NET_PKTGEN)
1668int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1669#endif
1670
1671void xfrm_local_error(struct sk_buff *skb, int mtu);
 
1672int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1673		    int encap_type);
1674int xfrm4_transport_finish(struct sk_buff *skb, int async);
1675int xfrm4_rcv(struct sk_buff *skb);
1676
1677static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1678{
1679	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1680	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1681	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1682	return xfrm_input(skb, nexthdr, spi, 0);
1683}
1684
1685int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1686int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1687int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1688int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1689int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1690void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
 
1691int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1692		  struct ip6_tnl *t);
1693int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1694		    int encap_type);
1695int xfrm6_transport_finish(struct sk_buff *skb, int async);
1696int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1697int xfrm6_rcv(struct sk_buff *skb);
1698int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1699		     xfrm_address_t *saddr, u8 proto);
1700void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1701int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1702int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1703int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1704int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1705__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1706__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1707int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1708
1709#ifdef CONFIG_XFRM
1710void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1711int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1712int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1713struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1714					struct sk_buff *skb);
1715struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1716					struct sk_buff *skb);
1717int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1718		     int optlen);
1719#else
1720static inline int xfrm_user_policy(struct sock *sk, int optname,
1721				   sockptr_t optval, int optlen)
1722{
1723 	return -ENOPROTOOPT;
1724}
1725#endif
1726
1727struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1728				    const xfrm_address_t *saddr,
1729				    const xfrm_address_t *daddr,
1730				    int family, u32 mark);
1731
1732struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1733
1734void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1735int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1736		     int (*func)(struct xfrm_policy *, int, int, void*),
1737		     void *);
1738void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1739int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1740struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1741					  const struct xfrm_mark *mark,
1742					  u32 if_id, u8 type, int dir,
1743					  struct xfrm_selector *sel,
1744					  struct xfrm_sec_ctx *ctx, int delete,
1745					  int *err);
1746struct xfrm_policy *xfrm_policy_byid(struct net *net,
1747				     const struct xfrm_mark *mark, u32 if_id,
1748				     u8 type, int dir, u32 id, int delete,
1749				     int *err);
1750int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1751void xfrm_policy_hash_rebuild(struct net *net);
1752u32 xfrm_get_acqseq(void);
1753int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1754int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1755		   struct netlink_ext_ack *extack);
1756struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1757				 u8 mode, u32 reqid, u32 if_id, u8 proto,
1758				 const xfrm_address_t *daddr,
1759				 const xfrm_address_t *saddr, int create,
1760				 unsigned short family);
1761int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1762
1763#ifdef CONFIG_XFRM_MIGRATE
1764int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1765	       const struct xfrm_migrate *m, int num_bundles,
1766	       const struct xfrm_kmaddress *k,
1767	       const struct xfrm_encap_tmpl *encap);
1768struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1769						u32 if_id);
1770struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1771				      struct xfrm_migrate *m,
1772				      struct xfrm_encap_tmpl *encap);
1773int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1774		 struct xfrm_migrate *m, int num_bundles,
1775		 struct xfrm_kmaddress *k, struct net *net,
1776		 struct xfrm_encap_tmpl *encap, u32 if_id,
1777		 struct netlink_ext_ack *extack);
1778#endif
1779
1780int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1781void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1782int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1783	      xfrm_address_t *addr);
1784
1785void xfrm_input_init(void);
1786int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1787
1788void xfrm_probe_algs(void);
1789int xfrm_count_pfkey_auth_supported(void);
1790int xfrm_count_pfkey_enc_supported(void);
1791struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1792struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1793struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1794struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1795struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1796struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1797struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1798struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1799struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1800					    int probe);
1801
1802static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1803				    const xfrm_address_t *b)
1804{
1805	return ipv6_addr_equal((const struct in6_addr *)a,
1806			       (const struct in6_addr *)b);
1807}
1808
1809static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1810				   const xfrm_address_t *b,
1811				   sa_family_t family)
1812{
1813	switch (family) {
1814	default:
1815	case AF_INET:
1816		return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1817	case AF_INET6:
1818		return xfrm6_addr_equal(a, b);
1819	}
1820}
1821
1822static inline int xfrm_policy_id2dir(u32 index)
1823{
1824	return index & 7;
1825}
1826
1827#ifdef CONFIG_XFRM
1828void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1829int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1830void xfrm_replay_notify(struct xfrm_state *x, int event);
1831int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1832int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1833
1834static inline int xfrm_aevent_is_on(struct net *net)
1835{
1836	struct sock *nlsk;
1837	int ret = 0;
1838
1839	rcu_read_lock();
1840	nlsk = rcu_dereference(net->xfrm.nlsk);
1841	if (nlsk)
1842		ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1843	rcu_read_unlock();
1844	return ret;
1845}
1846
1847static inline int xfrm_acquire_is_on(struct net *net)
1848{
1849	struct sock *nlsk;
1850	int ret = 0;
1851
1852	rcu_read_lock();
1853	nlsk = rcu_dereference(net->xfrm.nlsk);
1854	if (nlsk)
1855		ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1856	rcu_read_unlock();
1857
1858	return ret;
1859}
1860#endif
1861
1862static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1863{
1864	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1865}
1866
1867static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1868{
1869	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1870}
1871
1872static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1873{
1874	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1875}
1876
1877static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1878{
1879	return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1880}
1881
1882#ifdef CONFIG_XFRM_MIGRATE
1883static inline int xfrm_replay_clone(struct xfrm_state *x,
1884				     struct xfrm_state *orig)
1885{
1886
1887	x->replay_esn = kmemdup(orig->replay_esn,
1888				xfrm_replay_state_esn_len(orig->replay_esn),
1889				GFP_KERNEL);
1890	if (!x->replay_esn)
1891		return -ENOMEM;
1892	x->preplay_esn = kmemdup(orig->preplay_esn,
1893				 xfrm_replay_state_esn_len(orig->preplay_esn),
1894				 GFP_KERNEL);
1895	if (!x->preplay_esn)
1896		return -ENOMEM;
1897
1898	return 0;
1899}
1900
1901static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1902{
1903	return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1904}
1905
1906
1907static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1908{
1909	return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1910}
1911
1912static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1913{
1914	return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1915}
1916
1917static inline void xfrm_states_put(struct xfrm_state **states, int n)
1918{
1919	int i;
1920	for (i = 0; i < n; i++)
1921		xfrm_state_put(*(states + i));
1922}
1923
1924static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1925{
1926	int i;
1927	for (i = 0; i < n; i++)
1928		xfrm_state_delete(*(states + i));
1929}
1930#endif
1931
1932void __init xfrm_dev_init(void);
1933
1934#ifdef CONFIG_XFRM_OFFLOAD
1935void xfrm_dev_resume(struct sk_buff *skb);
1936void xfrm_dev_backlog(struct softnet_data *sd);
1937struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1938int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1939		       struct xfrm_user_offload *xuo,
1940		       struct netlink_ext_ack *extack);
1941int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1942			struct xfrm_user_offload *xuo, u8 dir,
1943			struct netlink_ext_ack *extack);
1944bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1945
1946static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1947{
1948	struct xfrm_dev_offload *xso = &x->xso;
1949
1950	if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1951		xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1952}
1953
1954static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1955{
1956	struct xfrm_state *x = dst->xfrm;
1957	struct xfrm_dst *xdst;
1958
1959	if (!x || !x->type_offload)
1960		return false;
1961
1962	xdst = (struct xfrm_dst *) dst;
1963	if (!x->xso.offload_handle && !xdst->child->xfrm)
1964		return true;
1965	if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1966	    !xdst->child->xfrm)
1967		return true;
1968
1969	return false;
1970}
1971
1972static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1973{
1974	struct xfrm_dev_offload *xso = &x->xso;
1975
1976	if (xso->dev)
1977		xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1978}
1979
1980static inline void xfrm_dev_state_free(struct xfrm_state *x)
1981{
1982	struct xfrm_dev_offload *xso = &x->xso;
1983	struct net_device *dev = xso->dev;
1984
1985	if (dev && dev->xfrmdev_ops) {
1986		if (dev->xfrmdev_ops->xdo_dev_state_free)
1987			dev->xfrmdev_ops->xdo_dev_state_free(x);
1988		xso->dev = NULL;
1989		xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1990		netdev_put(dev, &xso->dev_tracker);
1991	}
1992}
1993
1994static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1995{
1996	struct xfrm_dev_offload *xdo = &x->xdo;
1997	struct net_device *dev = xdo->dev;
1998
1999	if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
2000		dev->xfrmdev_ops->xdo_dev_policy_delete(x);
2001}
2002
2003static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2004{
2005	struct xfrm_dev_offload *xdo = &x->xdo;
2006	struct net_device *dev = xdo->dev;
2007
2008	if (dev && dev->xfrmdev_ops) {
2009		if (dev->xfrmdev_ops->xdo_dev_policy_free)
2010			dev->xfrmdev_ops->xdo_dev_policy_free(x);
2011		xdo->dev = NULL;
2012		netdev_put(dev, &xdo->dev_tracker);
2013	}
2014}
2015#else
2016static inline void xfrm_dev_resume(struct sk_buff *skb)
2017{
2018}
2019
2020static inline void xfrm_dev_backlog(struct softnet_data *sd)
2021{
2022}
2023
2024static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2025{
2026	return skb;
2027}
2028
2029static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2030{
2031	return 0;
2032}
2033
2034static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2035{
2036}
2037
2038static inline void xfrm_dev_state_free(struct xfrm_state *x)
2039{
2040}
2041
2042static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2043				      struct xfrm_user_offload *xuo, u8 dir,
2044				      struct netlink_ext_ack *extack)
2045{
2046	return 0;
2047}
2048
2049static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2050{
2051}
2052
2053static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2054{
2055}
2056
2057static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2058{
2059	return false;
2060}
2061
2062static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2063{
2064}
2065
2066static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2067{
2068	return false;
2069}
2070#endif
2071
2072static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2073{
2074	if (attrs[XFRMA_MARK])
2075		memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2076	else
2077		m->v = m->m = 0;
2078
2079	return m->v & m->m;
2080}
2081
2082static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2083{
2084	int ret = 0;
2085
2086	if (m->m | m->v)
2087		ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2088	return ret;
2089}
2090
2091static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2092{
2093	struct xfrm_mark *m = &x->props.smark;
2094
2095	return (m->v & m->m) | (mark & ~m->m);
2096}
2097
2098static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2099{
2100	int ret = 0;
2101
2102	if (if_id)
2103		ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2104	return ret;
2105}
2106
2107static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2108				    unsigned int family)
2109{
2110	bool tunnel = false;
2111
2112	switch(family) {
2113	case AF_INET:
2114		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2115			tunnel = true;
2116		break;
2117	case AF_INET6:
2118		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2119			tunnel = true;
2120		break;
2121	}
2122	if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2123		return -EINVAL;
2124
2125	return 0;
2126}
2127
2128extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2129extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2130
2131struct xfrm_translator {
2132	/* Allocate frag_list and put compat translation there */
2133	int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2134
2135	/* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2136	struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2137			int maxtype, const struct nla_policy *policy,
2138			struct netlink_ext_ack *extack);
2139
2140	/* Translate 32-bit user_policy from sockptr */
2141	int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2142
2143	struct module *owner;
2144};
2145
2146#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2147extern int xfrm_register_translator(struct xfrm_translator *xtr);
2148extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2149extern struct xfrm_translator *xfrm_get_translator(void);
2150extern void xfrm_put_translator(struct xfrm_translator *xtr);
2151#else
2152static inline struct xfrm_translator *xfrm_get_translator(void)
2153{
2154	return NULL;
2155}
2156static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2157{
2158}
2159#endif
2160
2161#if IS_ENABLED(CONFIG_IPV6)
2162static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2163{
2164	int proto;
2165
2166	if (!sk || sk->sk_family != AF_INET6)
2167		return false;
2168
2169	proto = sk->sk_protocol;
2170	if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2171		return inet6_test_bit(DONTFRAG, sk);
2172
2173	return false;
2174}
2175#endif
2176
2177#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2178    (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2179
2180extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2181
2182int register_xfrm_interface_bpf(void);
2183
2184#else
2185
2186static inline int register_xfrm_interface_bpf(void)
2187{
2188	return 0;
2189}
2190
2191#endif
2192
2193#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF)
2194int register_xfrm_state_bpf(void);
2195#else
2196static inline int register_xfrm_state_bpf(void)
2197{
2198	return 0;
2199}
2200#endif
2201
2202#endif	/* _NET_XFRM_H */