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
 
 
 
 
 
 
 148/* Full description of state of transformer. */
 149struct xfrm_state {
 150	possible_net_t		xs_net;
 151	union {
 152		struct hlist_node	gclist;
 153		struct hlist_node	bydst;
 154	};
 155	struct hlist_node	bysrc;
 156	struct hlist_node	byspi;
 
 157
 158	refcount_t		refcnt;
 159	spinlock_t		lock;
 160
 161	struct xfrm_id		id;
 162	struct xfrm_selector	sel;
 163	struct xfrm_mark	mark;
 164	u32			if_id;
 165	u32			tfcpad;
 166
 167	u32			genid;
 168
 169	/* Key manager bits */
 170	struct xfrm_state_walk	km;
 171
 172	/* Parameters of this state. */
 173	struct {
 174		u32		reqid;
 175		u8		mode;
 176		u8		replay_window;
 177		u8		aalgo, ealgo, calgo;
 178		u8		flags;
 179		u16		family;
 180		xfrm_address_t	saddr;
 181		int		header_len;
 182		int		trailer_len;
 183		u32		extra_flags;
 184		struct xfrm_mark	smark;
 185	} props;
 186
 187	struct xfrm_lifetime_cfg lft;
 188
 189	/* Data for transformer */
 190	struct xfrm_algo_auth	*aalg;
 191	struct xfrm_algo	*ealg;
 192	struct xfrm_algo	*calg;
 193	struct xfrm_algo_aead	*aead;
 194	const char		*geniv;
 195
 
 
 
 
 
 196	/* Data for encapsulator */
 197	struct xfrm_encap_tmpl	*encap;
 198	struct sock __rcu	*encap_sk;
 199
 200	/* Data for care-of address */
 201	xfrm_address_t	*coaddr;
 202
 203	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
 204	struct xfrm_state	*tunnel;
 205
 206	/* If a tunnel, number of users + 1 */
 207	atomic_t		tunnel_users;
 208
 209	/* State for replay detection */
 210	struct xfrm_replay_state replay;
 211	struct xfrm_replay_state_esn *replay_esn;
 212
 213	/* Replay detection state at the time we sent the last notification */
 214	struct xfrm_replay_state preplay;
 215	struct xfrm_replay_state_esn *preplay_esn;
 216
 217	/* The functions for replay detection. */
 218	const struct xfrm_replay *repl;
 219
 220	/* internal flag that only holds state for delayed aevent at the
 221	 * moment
 222	*/
 223	u32			xflags;
 224
 225	/* Replay detection notification settings */
 226	u32			replay_maxage;
 227	u32			replay_maxdiff;
 228
 229	/* Replay detection notification timer */
 230	struct timer_list	rtimer;
 231
 232	/* Statistics */
 233	struct xfrm_stats	stats;
 234
 235	struct xfrm_lifetime_cur curlft;
 236	struct hrtimer		mtimer;
 237
 238	struct xfrm_state_offload xso;
 239
 240	/* used to fix curlft->add_time when changing date */
 241	long		saved_tmo;
 242
 243	/* Last used time */
 244	time64_t		lastused;
 245
 246	struct page_frag xfrag;
 247
 248	/* Reference to data common to all the instances of this
 249	 * transformer. */
 250	const struct xfrm_type	*type;
 251	struct xfrm_mode	inner_mode;
 252	struct xfrm_mode	inner_mode_iaf;
 253	struct xfrm_mode	outer_mode;
 254
 255	const struct xfrm_type_offload	*type_offload;
 256
 257	/* Security context */
 258	struct xfrm_sec_ctx	*security;
 259
 260	/* Private data of this transformer, format is opaque,
 261	 * interpreted by xfrm_type methods. */
 262	void			*data;
 263};
 264
 265static inline struct net *xs_net(struct xfrm_state *x)
 266{
 267	return read_pnet(&x->xs_net);
 268}
 269
 270/* xflags - make enum if more show up */
 271#define XFRM_TIME_DEFER	1
 272#define XFRM_SOFT_EXPIRE 2
 273
 274enum {
 275	XFRM_STATE_VOID,
 276	XFRM_STATE_ACQ,
 277	XFRM_STATE_VALID,
 278	XFRM_STATE_ERROR,
 279	XFRM_STATE_EXPIRED,
 280	XFRM_STATE_DEAD
 281};
 282
 283/* callback structure passed from either netlink or pfkey */
 284struct km_event {
 285	union {
 286		u32 hard;
 287		u32 proto;
 288		u32 byid;
 289		u32 aevent;
 290		u32 type;
 291	} data;
 292
 293	u32	seq;
 294	u32	portid;
 295	u32	event;
 296	struct net *net;
 297};
 298
 299struct xfrm_replay {
 300	void	(*advance)(struct xfrm_state *x, __be32 net_seq);
 301	int	(*check)(struct xfrm_state *x,
 302			 struct sk_buff *skb,
 303			 __be32 net_seq);
 304	int	(*recheck)(struct xfrm_state *x,
 305			   struct sk_buff *skb,
 306			   __be32 net_seq);
 307	void	(*notify)(struct xfrm_state *x, int event);
 308	int	(*overflow)(struct xfrm_state *x, struct sk_buff *skb);
 309};
 310
 311struct xfrm_if_cb {
 312	struct xfrm_if	*(*decode_session)(struct sk_buff *skb,
 313					   unsigned short family);
 
 314};
 315
 316void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
 317void xfrm_if_unregister_cb(void);
 318
 319struct net_device;
 320struct xfrm_type;
 321struct xfrm_dst;
 322struct xfrm_policy_afinfo {
 323	struct dst_ops		*dst_ops;
 324	struct dst_entry	*(*dst_lookup)(struct net *net,
 325					       int tos, int oif,
 326					       const xfrm_address_t *saddr,
 327					       const xfrm_address_t *daddr,
 328					       u32 mark);
 329	int			(*get_saddr)(struct net *net, int oif,
 330					     xfrm_address_t *saddr,
 331					     xfrm_address_t *daddr,
 332					     u32 mark);
 333	int			(*fill_dst)(struct xfrm_dst *xdst,
 334					    struct net_device *dev,
 335					    const struct flowi *fl);
 336	struct dst_entry	*(*blackhole_route)(struct net *net, struct dst_entry *orig);
 337};
 338
 339int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
 340void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
 341void km_policy_notify(struct xfrm_policy *xp, int dir,
 342		      const struct km_event *c);
 343void km_state_notify(struct xfrm_state *x, const struct km_event *c);
 344
 345struct xfrm_tmpl;
 346int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
 347	     struct xfrm_policy *pol);
 348void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 349int __xfrm_state_delete(struct xfrm_state *x);
 350
 351struct xfrm_state_afinfo {
 352	u8				family;
 353	u8				proto;
 354
 355	const struct xfrm_type_offload *type_offload_esp;
 356
 357	const struct xfrm_type		*type_esp;
 358	const struct xfrm_type		*type_ipip;
 359	const struct xfrm_type		*type_ipip6;
 360	const struct xfrm_type		*type_comp;
 361	const struct xfrm_type		*type_ah;
 362	const struct xfrm_type		*type_routing;
 363	const struct xfrm_type		*type_dstopts;
 364
 365	int			(*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
 366	int			(*transport_finish)(struct sk_buff *skb,
 367						    int async);
 368	void			(*local_error)(struct sk_buff *skb, u32 mtu);
 369};
 370
 371int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 372int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 373struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
 374struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
 375
 376struct xfrm_input_afinfo {
 377	u8			family;
 378	bool			is_ipip;
 379	int			(*callback)(struct sk_buff *skb, u8 protocol,
 380					    int err);
 381};
 382
 383int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
 384int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
 385
 386void xfrm_flush_gc(void);
 387void xfrm_state_delete_tunnel(struct xfrm_state *x);
 388
 389struct xfrm_type {
 390	char			*description;
 391	struct module		*owner;
 392	u8			proto;
 393	u8			flags;
 394#define XFRM_TYPE_NON_FRAGMENT	1
 395#define XFRM_TYPE_REPLAY_PROT	2
 396#define XFRM_TYPE_LOCAL_COADDR	4
 397#define XFRM_TYPE_REMOTE_COADDR	8
 398
 399	int			(*init_state)(struct xfrm_state *x);
 
 400	void			(*destructor)(struct xfrm_state *);
 401	int			(*input)(struct xfrm_state *, struct sk_buff *skb);
 402	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
 403	int			(*reject)(struct xfrm_state *, struct sk_buff *,
 404					  const struct flowi *);
 405	int			(*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 406};
 407
 408int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 409void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 410
 411struct xfrm_type_offload {
 412	char		*description;
 413	struct module	*owner;
 414	u8		proto;
 415	void		(*encap)(struct xfrm_state *, struct sk_buff *pskb);
 416	int		(*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
 417	int		(*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
 418};
 419
 420int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
 421void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
 422
 423static inline int xfrm_af2proto(unsigned int family)
 424{
 425	switch(family) {
 426	case AF_INET:
 427		return IPPROTO_IPIP;
 428	case AF_INET6:
 429		return IPPROTO_IPV6;
 430	default:
 431		return 0;
 432	}
 433}
 434
 435static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 436{
 437	if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 438	    (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 439		return &x->inner_mode;
 440	else
 441		return &x->inner_mode_iaf;
 442}
 443
 444struct xfrm_tmpl {
 445/* id in template is interpreted as:
 446 * daddr - destination of tunnel, may be zero for transport mode.
 447 * spi   - zero to acquire spi. Not zero if spi is static, then
 448 *	   daddr must be fixed too.
 449 * proto - AH/ESP/IPCOMP
 450 */
 451	struct xfrm_id		id;
 452
 453/* Source address of tunnel. Ignored, if it is not a tunnel. */
 454	xfrm_address_t		saddr;
 455
 456	unsigned short		encap_family;
 457
 458	u32			reqid;
 459
 460/* Mode: transport, tunnel etc. */
 461	u8			mode;
 462
 463/* Sharing mode: unique, this session only, this user only etc. */
 464	u8			share;
 465
 466/* May skip this transfomration if no SA is found */
 467	u8			optional;
 468
 469/* Skip aalgos/ealgos/calgos checks. */
 470	u8			allalgs;
 471
 472/* Bit mask of algos allowed for acquisition */
 473	u32			aalgos;
 474	u32			ealgos;
 475	u32			calgos;
 476};
 477
 478#define XFRM_MAX_DEPTH		6
 479#define XFRM_MAX_OFFLOAD_DEPTH	1
 480
 481struct xfrm_policy_walk_entry {
 482	struct list_head	all;
 483	u8			dead;
 484};
 485
 486struct xfrm_policy_walk {
 487	struct xfrm_policy_walk_entry walk;
 488	u8 type;
 489	u32 seq;
 490};
 491
 492struct xfrm_policy_queue {
 493	struct sk_buff_head	hold_queue;
 494	struct timer_list	hold_timer;
 495	unsigned long		timeout;
 496};
 497
 498struct xfrm_policy {
 499	possible_net_t		xp_net;
 500	struct hlist_node	bydst;
 501	struct hlist_node	byidx;
 502
 503	/* This lock only affects elements except for entry. */
 504	rwlock_t		lock;
 505	refcount_t		refcnt;
 506	u32			pos;
 507	struct timer_list	timer;
 508
 509	atomic_t		genid;
 510	u32			priority;
 511	u32			index;
 512	u32			if_id;
 513	struct xfrm_mark	mark;
 514	struct xfrm_selector	selector;
 515	struct xfrm_lifetime_cfg lft;
 516	struct xfrm_lifetime_cur curlft;
 517	struct xfrm_policy_walk_entry walk;
 518	struct xfrm_policy_queue polq;
 519	bool                    bydst_reinsert;
 520	u8			type;
 521	u8			action;
 522	u8			flags;
 523	u8			xfrm_nr;
 524	u16			family;
 525	struct xfrm_sec_ctx	*security;
 526	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
 527	struct hlist_node	bydst_inexact_list;
 528	struct rcu_head		rcu;
 
 
 529};
 530
 531static inline struct net *xp_net(const struct xfrm_policy *xp)
 532{
 533	return read_pnet(&xp->xp_net);
 534}
 535
 536struct xfrm_kmaddress {
 537	xfrm_address_t          local;
 538	xfrm_address_t          remote;
 539	u32			reserved;
 540	u16			family;
 541};
 542
 543struct xfrm_migrate {
 544	xfrm_address_t		old_daddr;
 545	xfrm_address_t		old_saddr;
 546	xfrm_address_t		new_daddr;
 547	xfrm_address_t		new_saddr;
 548	u8			proto;
 549	u8			mode;
 550	u16			reserved;
 551	u32			reqid;
 552	u16			old_family;
 553	u16			new_family;
 554};
 555
 556#define XFRM_KM_TIMEOUT                30
 557/* what happened */
 558#define XFRM_REPLAY_UPDATE	XFRM_AE_CR
 559#define XFRM_REPLAY_TIMEOUT	XFRM_AE_CE
 560
 561/* default aevent timeout in units of 100ms */
 562#define XFRM_AE_ETIME			10
 563/* Async Event timer multiplier */
 564#define XFRM_AE_ETH_M			10
 565/* default seq threshold size */
 566#define XFRM_AE_SEQT_SIZE		2
 567
 568struct xfrm_mgr {
 569	struct list_head	list;
 570	int			(*notify)(struct xfrm_state *x, const struct km_event *c);
 571	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
 572	struct xfrm_policy	*(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 573	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 574	int			(*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
 575	int			(*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 576	int			(*migrate)(const struct xfrm_selector *sel,
 577					   u8 dir, u8 type,
 578					   const struct xfrm_migrate *m,
 579					   int num_bundles,
 580					   const struct xfrm_kmaddress *k,
 581					   const struct xfrm_encap_tmpl *encap);
 582	bool			(*is_alive)(const struct km_event *c);
 583};
 584
 585int xfrm_register_km(struct xfrm_mgr *km);
 586int xfrm_unregister_km(struct xfrm_mgr *km);
 587
 588struct xfrm_tunnel_skb_cb {
 589	union {
 590		struct inet_skb_parm h4;
 591		struct inet6_skb_parm h6;
 592	} header;
 593
 594	union {
 595		struct ip_tunnel *ip4;
 596		struct ip6_tnl *ip6;
 597	} tunnel;
 598};
 599
 600#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
 601
 602/*
 603 * This structure is used for the duration where packets are being
 604 * transformed by IPsec.  As soon as the packet leaves IPsec the
 605 * area beyond the generic IP part may be overwritten.
 606 */
 607struct xfrm_skb_cb {
 608	struct xfrm_tunnel_skb_cb header;
 609
 610        /* Sequence number for replay protection. */
 611	union {
 612		struct {
 613			__u32 low;
 614			__u32 hi;
 615		} output;
 616		struct {
 617			__be32 low;
 618			__be32 hi;
 619		} input;
 620	} seq;
 621};
 622
 623#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 624
 625/*
 626 * This structure is used by the afinfo prepare_input/prepare_output functions
 627 * to transmit header information to the mode input/output functions.
 628 */
 629struct xfrm_mode_skb_cb {
 630	struct xfrm_tunnel_skb_cb header;
 631
 632	/* Copied from header for IPv4, always set to zero and DF for IPv6. */
 633	__be16 id;
 634	__be16 frag_off;
 635
 636	/* IP header length (excluding options or extension headers). */
 637	u8 ihl;
 638
 639	/* TOS for IPv4, class for IPv6. */
 640	u8 tos;
 641
 642	/* TTL for IPv4, hop limitfor IPv6. */
 643	u8 ttl;
 644
 645	/* Protocol for IPv4, NH for IPv6. */
 646	u8 protocol;
 647
 648	/* Option length for IPv4, zero for IPv6. */
 649	u8 optlen;
 650
 651	/* Used by IPv6 only, zero for IPv4. */
 652	u8 flow_lbl[3];
 653};
 654
 655#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 656
 657/*
 658 * This structure is used by the input processing to locate the SPI and
 659 * related information.
 660 */
 661struct xfrm_spi_skb_cb {
 662	struct xfrm_tunnel_skb_cb header;
 663
 664	unsigned int daddroff;
 665	unsigned int family;
 666	__be32 seq;
 667};
 668
 669#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 670
 671#ifdef CONFIG_AUDITSYSCALL
 672static inline struct audit_buffer *xfrm_audit_start(const char *op)
 673{
 674	struct audit_buffer *audit_buf = NULL;
 675
 676	if (audit_enabled == AUDIT_OFF)
 677		return NULL;
 678	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
 679				    AUDIT_MAC_IPSEC_EVENT);
 680	if (audit_buf == NULL)
 681		return NULL;
 682	audit_log_format(audit_buf, "op=%s", op);
 683	return audit_buf;
 684}
 685
 686static inline void xfrm_audit_helper_usrinfo(bool task_valid,
 687					     struct audit_buffer *audit_buf)
 688{
 689	const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
 690					    audit_get_loginuid(current) :
 691					    INVALID_UID);
 692	const unsigned int ses = task_valid ? audit_get_sessionid(current) :
 693		AUDIT_SID_UNSET;
 694
 695	audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 696	audit_log_task_context(audit_buf);
 697}
 698
 699void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
 700void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 701			      bool task_valid);
 702void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
 703void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
 704void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 705				      struct sk_buff *skb);
 706void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
 707			     __be32 net_seq);
 708void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 709void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
 710			       __be32 net_seq);
 711void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
 712			      u8 proto);
 713#else
 714
 715static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 716					 bool task_valid)
 717{
 718}
 719
 720static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 721					    bool task_valid)
 722{
 723}
 724
 725static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 726					bool task_valid)
 727{
 728}
 729
 730static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 731					   bool task_valid)
 732{
 733}
 734
 735static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 736					     struct sk_buff *skb)
 737{
 738}
 739
 740static inline void xfrm_audit_state_replay(struct xfrm_state *x,
 741					   struct sk_buff *skb, __be32 net_seq)
 742{
 743}
 744
 745static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 746				      u16 family)
 747{
 748}
 749
 750static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 751				      __be32 net_spi, __be32 net_seq)
 752{
 753}
 754
 755static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 756				     struct sk_buff *skb, u8 proto)
 757{
 758}
 759#endif /* CONFIG_AUDITSYSCALL */
 760
 761static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 762{
 763	if (likely(policy != NULL))
 764		refcount_inc(&policy->refcnt);
 765}
 766
 767void xfrm_policy_destroy(struct xfrm_policy *policy);
 768
 769static inline void xfrm_pol_put(struct xfrm_policy *policy)
 770{
 771	if (refcount_dec_and_test(&policy->refcnt))
 772		xfrm_policy_destroy(policy);
 773}
 774
 775static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 776{
 777	int i;
 778	for (i = npols - 1; i >= 0; --i)
 779		xfrm_pol_put(pols[i]);
 780}
 781
 782void __xfrm_state_destroy(struct xfrm_state *, bool);
 783
 784static inline void __xfrm_state_put(struct xfrm_state *x)
 785{
 786	refcount_dec(&x->refcnt);
 787}
 788
 789static inline void xfrm_state_put(struct xfrm_state *x)
 790{
 791	if (refcount_dec_and_test(&x->refcnt))
 792		__xfrm_state_destroy(x, false);
 793}
 794
 795static inline void xfrm_state_put_sync(struct xfrm_state *x)
 796{
 797	if (refcount_dec_and_test(&x->refcnt))
 798		__xfrm_state_destroy(x, true);
 799}
 800
 801static inline void xfrm_state_hold(struct xfrm_state *x)
 802{
 803	refcount_inc(&x->refcnt);
 804}
 805
 806static inline bool addr_match(const void *token1, const void *token2,
 807			      unsigned int prefixlen)
 808{
 809	const __be32 *a1 = token1;
 810	const __be32 *a2 = token2;
 811	unsigned int pdw;
 812	unsigned int pbi;
 813
 814	pdw = prefixlen >> 5;	  /* num of whole u32 in prefix */
 815	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 816
 817	if (pdw)
 818		if (memcmp(a1, a2, pdw << 2))
 819			return false;
 820
 821	if (pbi) {
 822		__be32 mask;
 823
 824		mask = htonl((0xffffffff) << (32 - pbi));
 825
 826		if ((a1[pdw] ^ a2[pdw]) & mask)
 827			return false;
 828	}
 829
 830	return true;
 831}
 832
 833static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
 834{
 835	/* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
 836	if (sizeof(long) == 4 && prefixlen == 0)
 837		return true;
 838	return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
 839}
 840
 841static __inline__
 842__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
 843{
 844	__be16 port;
 845	switch(fl->flowi_proto) {
 846	case IPPROTO_TCP:
 847	case IPPROTO_UDP:
 848	case IPPROTO_UDPLITE:
 849	case IPPROTO_SCTP:
 850		port = uli->ports.sport;
 851		break;
 852	case IPPROTO_ICMP:
 853	case IPPROTO_ICMPV6:
 854		port = htons(uli->icmpt.type);
 855		break;
 856	case IPPROTO_MH:
 857		port = htons(uli->mht.type);
 858		break;
 859	case IPPROTO_GRE:
 860		port = htons(ntohl(uli->gre_key) >> 16);
 861		break;
 862	default:
 863		port = 0;	/*XXX*/
 864	}
 865	return port;
 866}
 867
 868static __inline__
 869__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
 870{
 871	__be16 port;
 872	switch(fl->flowi_proto) {
 873	case IPPROTO_TCP:
 874	case IPPROTO_UDP:
 875	case IPPROTO_UDPLITE:
 876	case IPPROTO_SCTP:
 877		port = uli->ports.dport;
 878		break;
 879	case IPPROTO_ICMP:
 880	case IPPROTO_ICMPV6:
 881		port = htons(uli->icmpt.code);
 882		break;
 883	case IPPROTO_GRE:
 884		port = htons(ntohl(uli->gre_key) & 0xffff);
 885		break;
 886	default:
 887		port = 0;	/*XXX*/
 888	}
 889	return port;
 890}
 891
 892bool xfrm_selector_match(const struct xfrm_selector *sel,
 893			 const struct flowi *fl, unsigned short family);
 894
 895#ifdef CONFIG_SECURITY_NETWORK_XFRM
 896/*	If neither has a context --> match
 897 * 	Otherwise, both must have a context and the sids, doi, alg must match
 898 */
 899static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 900{
 901	return ((!s1 && !s2) ||
 902		(s1 && s2 &&
 903		 (s1->ctx_sid == s2->ctx_sid) &&
 904		 (s1->ctx_doi == s2->ctx_doi) &&
 905		 (s1->ctx_alg == s2->ctx_alg)));
 906}
 907#else
 908static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 909{
 910	return true;
 911}
 912#endif
 913
 914/* A struct encoding bundle of transformations to apply to some set of flow.
 915 *
 916 * xdst->child points to the next element of bundle.
 917 * dst->xfrm  points to an instanse of transformer.
 918 *
 919 * Due to unfortunate limitations of current routing cache, which we
 920 * have no time to fix, it mirrors struct rtable and bound to the same
 921 * routing key, including saddr,daddr. However, we can have many of
 922 * bundles differing by session id. All the bundles grow from a parent
 923 * policy rule.
 924 */
 925struct xfrm_dst {
 926	union {
 927		struct dst_entry	dst;
 928		struct rtable		rt;
 929		struct rt6_info		rt6;
 930	} u;
 931	struct dst_entry *route;
 932	struct dst_entry *child;
 933	struct dst_entry *path;
 934	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
 935	int num_pols, num_xfrms;
 936	u32 xfrm_genid;
 937	u32 policy_genid;
 938	u32 route_mtu_cached;
 939	u32 child_mtu_cached;
 940	u32 route_cookie;
 941	u32 path_cookie;
 942};
 943
 944static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
 945{
 946#ifdef CONFIG_XFRM
 947	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
 948		const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
 949
 950		return xdst->path;
 951	}
 952#endif
 953	return (struct dst_entry *) dst;
 954}
 955
 956static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
 957{
 958#ifdef CONFIG_XFRM
 959	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
 960		struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
 961		return xdst->child;
 962	}
 963#endif
 964	return NULL;
 965}
 966
 967#ifdef CONFIG_XFRM
 968static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
 969{
 970	xdst->child = child;
 971}
 972
 973static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 974{
 975	xfrm_pols_put(xdst->pols, xdst->num_pols);
 976	dst_release(xdst->route);
 977	if (likely(xdst->u.dst.xfrm))
 978		xfrm_state_put(xdst->u.dst.xfrm);
 979}
 980#endif
 981
 982void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 983
 984struct xfrm_if_parms {
 985	int link;		/* ifindex of underlying L2 interface */
 986	u32 if_id;		/* interface identifyer */
 
 987};
 988
 989struct xfrm_if {
 990	struct xfrm_if __rcu *next;	/* next interface in list */
 991	struct net_device *dev;		/* virtual device associated with interface */
 992	struct net *net;		/* netns for packet i/o */
 993	struct xfrm_if_parms p;		/* interface parms */
 994
 995	struct gro_cells gro_cells;
 996};
 997
 998struct xfrm_offload {
 999	/* Output sequence number for replay protection on offloading. */
1000	struct {
1001		__u32 low;
1002		__u32 hi;
1003	} seq;
1004
1005	__u32			flags;
1006#define	SA_DELETE_REQ		1
1007#define	CRYPTO_DONE		2
1008#define	CRYPTO_NEXT_DONE	4
1009#define	CRYPTO_FALLBACK		8
1010#define	XFRM_GSO_SEGMENT	16
1011#define	XFRM_GRO		32
1012#define	XFRM_ESP_NO_TRAILER	64
1013#define	XFRM_DEV_RESUME		128
1014#define	XFRM_XMIT		256
1015
1016	__u32			status;
1017#define CRYPTO_SUCCESS				1
1018#define CRYPTO_GENERIC_ERROR			2
1019#define CRYPTO_TRANSPORT_AH_AUTH_FAILED		4
1020#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED	8
1021#define CRYPTO_TUNNEL_AH_AUTH_FAILED		16
1022#define CRYPTO_TUNNEL_ESP_AUTH_FAILED		32
1023#define CRYPTO_INVALID_PACKET_SYNTAX		64
1024#define CRYPTO_INVALID_PROTOCOL			128
1025
1026	__u8			proto;
 
1027};
1028
1029struct sec_path {
1030	int			len;
1031	int			olen;
 
1032
1033	struct xfrm_state	*xvec[XFRM_MAX_DEPTH];
1034	struct xfrm_offload	ovec[XFRM_MAX_OFFLOAD_DEPTH];
1035};
1036
1037struct sec_path *secpath_set(struct sk_buff *skb);
1038
1039static inline void
1040secpath_reset(struct sk_buff *skb)
1041{
1042#ifdef CONFIG_XFRM
1043	skb_ext_del(skb, SKB_EXT_SEC_PATH);
1044#endif
1045}
1046
1047static inline int
1048xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1049{
1050	switch (family) {
1051	case AF_INET:
1052		return addr->a4 == 0;
1053	case AF_INET6:
1054		return ipv6_addr_any(&addr->in6);
1055	}
1056	return 0;
1057}
1058
1059static inline int
1060__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1061{
1062	return	(tmpl->saddr.a4 &&
1063		 tmpl->saddr.a4 != x->props.saddr.a4);
1064}
1065
1066static inline int
1067__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1068{
1069	return	(!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1070		 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1071}
1072
1073static inline int
1074xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1075{
1076	switch (family) {
1077	case AF_INET:
1078		return __xfrm4_state_addr_cmp(tmpl, x);
1079	case AF_INET6:
1080		return __xfrm6_state_addr_cmp(tmpl, x);
1081	}
1082	return !0;
1083}
1084
1085#ifdef CONFIG_XFRM
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1086int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1087			unsigned short family);
1088
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1089static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1090				       struct sk_buff *skb,
1091				       unsigned int family, int reverse)
1092{
1093	struct net *net = dev_net(skb->dev);
1094	int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
 
 
1095
1096	if (sk && sk->sk_policy[XFRM_POLICY_IN])
1097		return __xfrm_policy_check(sk, ndir, skb, family);
1098
1099	return	(!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1100		(skb_dst(skb)->flags & DST_NOPOLICY) ||
1101		__xfrm_policy_check(sk, ndir, skb, family);
 
 
 
 
 
 
 
1102}
1103
1104static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1105{
1106	return __xfrm_policy_check2(sk, dir, skb, family, 0);
1107}
1108
1109static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1110{
1111	return xfrm_policy_check(sk, dir, skb, AF_INET);
1112}
1113
1114static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1115{
1116	return xfrm_policy_check(sk, dir, skb, AF_INET6);
1117}
1118
1119static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1120					     struct sk_buff *skb)
1121{
1122	return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1123}
1124
1125static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1126					     struct sk_buff *skb)
1127{
1128	return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1129}
1130
1131int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1132			  unsigned int family, int reverse);
1133
1134static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1135				      unsigned int family)
1136{
1137	return __xfrm_decode_session(skb, fl, family, 0);
1138}
1139
1140static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1141					      struct flowi *fl,
1142					      unsigned int family)
1143{
1144	return __xfrm_decode_session(skb, fl, family, 1);
1145}
1146
1147int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1148
1149static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1150{
1151	struct net *net = dev_net(skb->dev);
1152
1153	return	!net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1154		(skb_dst(skb)->flags & DST_NOXFRM) ||
1155		__xfrm_route_forward(skb, family);
 
 
 
1156}
1157
1158static inline int xfrm4_route_forward(struct sk_buff *skb)
1159{
1160	return xfrm_route_forward(skb, AF_INET);
1161}
1162
1163static inline int xfrm6_route_forward(struct sk_buff *skb)
1164{
1165	return xfrm_route_forward(skb, AF_INET6);
1166}
1167
1168int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1169
1170static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1171{
 
 
1172	sk->sk_policy[0] = NULL;
1173	sk->sk_policy[1] = NULL;
1174	if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1175		return __xfrm_sk_clone_policy(sk, osk);
1176	return 0;
1177}
1178
1179int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1180
1181static inline void xfrm_sk_free_policy(struct sock *sk)
1182{
1183	struct xfrm_policy *pol;
1184
1185	pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1186	if (unlikely(pol != NULL)) {
1187		xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1188		sk->sk_policy[0] = NULL;
1189	}
1190	pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1191	if (unlikely(pol != NULL)) {
1192		xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1193		sk->sk_policy[1] = NULL;
1194	}
1195}
1196
1197#else
1198
1199static inline void xfrm_sk_free_policy(struct sock *sk) {}
1200static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1201static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1202static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1203static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1204{
1205	return 1;
1206}
1207static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1208{
1209	return 1;
1210}
1211static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1212{
1213	return 1;
1214}
1215static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1216					      struct flowi *fl,
1217					      unsigned int family)
1218{
1219	return -ENOSYS;
1220}
1221static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1222					     struct sk_buff *skb)
1223{
1224	return 1;
1225}
1226static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1227					     struct sk_buff *skb)
1228{
1229	return 1;
1230}
1231#endif
1232
1233static __inline__
1234xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1235{
1236	switch (family){
1237	case AF_INET:
1238		return (xfrm_address_t *)&fl->u.ip4.daddr;
1239	case AF_INET6:
1240		return (xfrm_address_t *)&fl->u.ip6.daddr;
1241	}
1242	return NULL;
1243}
1244
1245static __inline__
1246xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1247{
1248	switch (family){
1249	case AF_INET:
1250		return (xfrm_address_t *)&fl->u.ip4.saddr;
1251	case AF_INET6:
1252		return (xfrm_address_t *)&fl->u.ip6.saddr;
1253	}
1254	return NULL;
1255}
1256
1257static __inline__
1258void xfrm_flowi_addr_get(const struct flowi *fl,
1259			 xfrm_address_t *saddr, xfrm_address_t *daddr,
1260			 unsigned short family)
1261{
1262	switch(family) {
1263	case AF_INET:
1264		memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1265		memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1266		break;
1267	case AF_INET6:
1268		saddr->in6 = fl->u.ip6.saddr;
1269		daddr->in6 = fl->u.ip6.daddr;
1270		break;
1271	}
1272}
1273
1274static __inline__ int
1275__xfrm4_state_addr_check(const struct xfrm_state *x,
1276			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277{
1278	if (daddr->a4 == x->id.daddr.a4 &&
1279	    (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1280		return 1;
1281	return 0;
1282}
1283
1284static __inline__ int
1285__xfrm6_state_addr_check(const struct xfrm_state *x,
1286			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1287{
1288	if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1289	    (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1290	     ipv6_addr_any((struct in6_addr *)saddr) ||
1291	     ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1292		return 1;
1293	return 0;
1294}
1295
1296static __inline__ int
1297xfrm_state_addr_check(const struct xfrm_state *x,
1298		      const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1299		      unsigned short family)
1300{
1301	switch (family) {
1302	case AF_INET:
1303		return __xfrm4_state_addr_check(x, daddr, saddr);
1304	case AF_INET6:
1305		return __xfrm6_state_addr_check(x, daddr, saddr);
1306	}
1307	return 0;
1308}
1309
1310static __inline__ int
1311xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1312			   unsigned short family)
1313{
1314	switch (family) {
1315	case AF_INET:
1316		return __xfrm4_state_addr_check(x,
1317						(const xfrm_address_t *)&fl->u.ip4.daddr,
1318						(const xfrm_address_t *)&fl->u.ip4.saddr);
1319	case AF_INET6:
1320		return __xfrm6_state_addr_check(x,
1321						(const xfrm_address_t *)&fl->u.ip6.daddr,
1322						(const xfrm_address_t *)&fl->u.ip6.saddr);
1323	}
1324	return 0;
1325}
1326
1327static inline int xfrm_state_kern(const struct xfrm_state *x)
1328{
1329	return atomic_read(&x->tunnel_users);
1330}
1331
1332static inline bool xfrm_id_proto_valid(u8 proto)
1333{
1334	switch (proto) {
1335	case IPPROTO_AH:
1336	case IPPROTO_ESP:
1337	case IPPROTO_COMP:
1338#if IS_ENABLED(CONFIG_IPV6)
1339	case IPPROTO_ROUTING:
1340	case IPPROTO_DSTOPTS:
1341#endif
1342		return true;
1343	default:
1344		return false;
1345	}
1346}
1347
1348/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1349static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1350{
1351	return (!userproto || proto == userproto ||
1352		(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1353						  proto == IPPROTO_ESP ||
1354						  proto == IPPROTO_COMP)));
1355}
1356
1357/*
1358 * xfrm algorithm information
1359 */
1360struct xfrm_algo_aead_info {
1361	char *geniv;
1362	u16 icv_truncbits;
1363};
1364
1365struct xfrm_algo_auth_info {
1366	u16 icv_truncbits;
1367	u16 icv_fullbits;
1368};
1369
1370struct xfrm_algo_encr_info {
1371	char *geniv;
1372	u16 blockbits;
1373	u16 defkeybits;
1374};
1375
1376struct xfrm_algo_comp_info {
1377	u16 threshold;
1378};
1379
1380struct xfrm_algo_desc {
1381	char *name;
1382	char *compat;
1383	u8 available:1;
1384	u8 pfkey_supported:1;
1385	union {
1386		struct xfrm_algo_aead_info aead;
1387		struct xfrm_algo_auth_info auth;
1388		struct xfrm_algo_encr_info encr;
1389		struct xfrm_algo_comp_info comp;
1390	} uinfo;
1391	struct sadb_alg desc;
1392};
1393
1394/* XFRM protocol handlers.  */
1395struct xfrm4_protocol {
1396	int (*handler)(struct sk_buff *skb);
1397	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1398			     int encap_type);
1399	int (*cb_handler)(struct sk_buff *skb, int err);
1400	int (*err_handler)(struct sk_buff *skb, u32 info);
1401
1402	struct xfrm4_protocol __rcu *next;
1403	int priority;
1404};
1405
1406struct xfrm6_protocol {
1407	int (*handler)(struct sk_buff *skb);
1408	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1409			     int encap_type);
1410	int (*cb_handler)(struct sk_buff *skb, int err);
1411	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1412			   u8 type, u8 code, int offset, __be32 info);
1413
1414	struct xfrm6_protocol __rcu *next;
1415	int priority;
1416};
1417
1418/* XFRM tunnel handlers.  */
1419struct xfrm_tunnel {
1420	int (*handler)(struct sk_buff *skb);
1421	int (*cb_handler)(struct sk_buff *skb, int err);
1422	int (*err_handler)(struct sk_buff *skb, u32 info);
1423
1424	struct xfrm_tunnel __rcu *next;
1425	int priority;
1426};
1427
1428struct xfrm6_tunnel {
1429	int (*handler)(struct sk_buff *skb);
1430	int (*cb_handler)(struct sk_buff *skb, int err);
1431	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1432			   u8 type, u8 code, int offset, __be32 info);
1433	struct xfrm6_tunnel __rcu *next;
1434	int priority;
1435};
1436
1437void xfrm_init(void);
1438void xfrm4_init(void);
1439int xfrm_state_init(struct net *net);
1440void xfrm_state_fini(struct net *net);
1441void xfrm4_state_init(void);
1442void xfrm4_protocol_init(void);
1443#ifdef CONFIG_XFRM
1444int xfrm6_init(void);
1445void xfrm6_fini(void);
1446int xfrm6_state_init(void);
1447void xfrm6_state_fini(void);
1448int xfrm6_protocol_init(void);
1449void xfrm6_protocol_fini(void);
1450#else
1451static inline int xfrm6_init(void)
1452{
1453	return 0;
1454}
1455static inline void xfrm6_fini(void)
1456{
1457	;
1458}
1459#endif
1460
1461#ifdef CONFIG_XFRM_STATISTICS
1462int xfrm_proc_init(struct net *net);
1463void xfrm_proc_fini(struct net *net);
1464#endif
1465
1466int xfrm_sysctl_init(struct net *net);
1467#ifdef CONFIG_SYSCTL
1468void xfrm_sysctl_fini(struct net *net);
1469#else
1470static inline void xfrm_sysctl_fini(struct net *net)
1471{
1472}
1473#endif
1474
1475void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1476			  struct xfrm_address_filter *filter);
1477int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1478		    int (*func)(struct xfrm_state *, int, void*), void *);
1479void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1480struct xfrm_state *xfrm_state_alloc(struct net *net);
1481void xfrm_state_free(struct xfrm_state *x);
1482struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1483				   const xfrm_address_t *saddr,
1484				   const struct flowi *fl,
1485				   struct xfrm_tmpl *tmpl,
1486				   struct xfrm_policy *pol, int *err,
1487				   unsigned short family, u32 if_id);
1488struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1489				       xfrm_address_t *daddr,
1490				       xfrm_address_t *saddr,
1491				       unsigned short family,
1492				       u8 mode, u8 proto, u32 reqid);
1493struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1494					      unsigned short family);
1495int xfrm_state_check_expire(struct xfrm_state *x);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1496void xfrm_state_insert(struct xfrm_state *x);
1497int xfrm_state_add(struct xfrm_state *x);
1498int xfrm_state_update(struct xfrm_state *x);
1499struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1500				     const xfrm_address_t *daddr, __be32 spi,
1501				     u8 proto, unsigned short family);
1502struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1503					    const xfrm_address_t *daddr,
1504					    const xfrm_address_t *saddr,
1505					    u8 proto,
1506					    unsigned short family);
1507#ifdef CONFIG_XFRM_SUB_POLICY
1508void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1509		    unsigned short family);
1510void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1511		     unsigned short family);
1512#else
1513static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1514				  int n, unsigned short family)
1515{
1516}
1517
1518static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1519				   int n, unsigned short family)
1520{
1521}
1522#endif
1523
1524struct xfrmk_sadinfo {
1525	u32 sadhcnt; /* current hash bkts */
1526	u32 sadhmcnt; /* max allowed hash bkts */
1527	u32 sadcnt; /* current running count */
1528};
1529
1530struct xfrmk_spdinfo {
1531	u32 incnt;
1532	u32 outcnt;
1533	u32 fwdcnt;
1534	u32 inscnt;
1535	u32 outscnt;
1536	u32 fwdscnt;
1537	u32 spdhcnt;
1538	u32 spdhmcnt;
1539};
1540
1541struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1542int xfrm_state_delete(struct xfrm_state *x);
1543int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1544int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
 
 
1545void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1546void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1547u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1548int xfrm_init_replay(struct xfrm_state *x);
1549u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1550int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
 
1551int xfrm_init_state(struct xfrm_state *x);
1552int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1553int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1554int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1555			 int (*finish)(struct net *, struct sock *,
1556				       struct sk_buff *));
1557int xfrm_trans_queue(struct sk_buff *skb,
1558		     int (*finish)(struct net *, struct sock *,
1559				   struct sk_buff *));
1560int xfrm_output_resume(struct sk_buff *skb, int err);
1561int xfrm_output(struct sock *sk, struct sk_buff *skb);
1562
1563#if IS_ENABLED(CONFIG_NET_PKTGEN)
1564int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1565#endif
1566
1567void xfrm_local_error(struct sk_buff *skb, int mtu);
1568int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1569int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1570		    int encap_type);
1571int xfrm4_transport_finish(struct sk_buff *skb, int async);
1572int xfrm4_rcv(struct sk_buff *skb);
1573int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1574
1575static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1576{
1577	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1578	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1579	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1580	return xfrm_input(skb, nexthdr, spi, 0);
1581}
1582
1583int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1584int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1585int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1586int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1587int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1588int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1589void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1590int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1591int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1592		  struct ip6_tnl *t);
1593int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1594		    int encap_type);
1595int xfrm6_transport_finish(struct sk_buff *skb, int async);
1596int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1597int xfrm6_rcv(struct sk_buff *skb);
1598int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1599		     xfrm_address_t *saddr, u8 proto);
1600void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1601int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1602int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1603int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1604int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1605__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1606__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1607int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1608int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1609int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1610			  u8 **prevhdr);
1611
1612#ifdef CONFIG_XFRM
1613void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1614int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1615int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
 
 
 
 
1616int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1617		     int optlen);
1618#else
1619static inline int xfrm_user_policy(struct sock *sk, int optname,
1620				   sockptr_t optval, int optlen)
1621{
1622 	return -ENOPROTOOPT;
1623}
1624#endif
1625
1626struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1627				    const xfrm_address_t *saddr,
1628				    const xfrm_address_t *daddr,
1629				    int family, u32 mark);
1630
1631struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1632
1633void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1634int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1635		     int (*func)(struct xfrm_policy *, int, int, void*),
1636		     void *);
1637void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1638int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1639struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1640					  const struct xfrm_mark *mark,
1641					  u32 if_id, u8 type, int dir,
1642					  struct xfrm_selector *sel,
1643					  struct xfrm_sec_ctx *ctx, int delete,
1644					  int *err);
1645struct xfrm_policy *xfrm_policy_byid(struct net *net,
1646				     const struct xfrm_mark *mark, u32 if_id,
1647				     u8 type, int dir, u32 id, int delete,
1648				     int *err);
1649int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1650void xfrm_policy_hash_rebuild(struct net *net);
1651u32 xfrm_get_acqseq(void);
1652int verify_spi_info(u8 proto, u32 min, u32 max);
1653int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
 
1654struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1655				 u8 mode, u32 reqid, u32 if_id, u8 proto,
1656				 const xfrm_address_t *daddr,
1657				 const xfrm_address_t *saddr, int create,
1658				 unsigned short family);
1659int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1660
1661#ifdef CONFIG_XFRM_MIGRATE
1662int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1663	       const struct xfrm_migrate *m, int num_bundles,
1664	       const struct xfrm_kmaddress *k,
1665	       const struct xfrm_encap_tmpl *encap);
1666struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
 
1667struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1668				      struct xfrm_migrate *m,
1669				      struct xfrm_encap_tmpl *encap);
1670int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1671		 struct xfrm_migrate *m, int num_bundles,
1672		 struct xfrm_kmaddress *k, struct net *net,
1673		 struct xfrm_encap_tmpl *encap);
 
1674#endif
1675
1676int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1677void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1678int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1679	      xfrm_address_t *addr);
1680
1681void xfrm_input_init(void);
1682int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1683
1684void xfrm_probe_algs(void);
1685int xfrm_count_pfkey_auth_supported(void);
1686int xfrm_count_pfkey_enc_supported(void);
1687struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1688struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1689struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1690struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1691struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1692struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1693struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1694struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1695struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1696					    int probe);
1697
1698static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1699				    const xfrm_address_t *b)
1700{
1701	return ipv6_addr_equal((const struct in6_addr *)a,
1702			       (const struct in6_addr *)b);
1703}
1704
1705static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1706				   const xfrm_address_t *b,
1707				   sa_family_t family)
1708{
1709	switch (family) {
1710	default:
1711	case AF_INET:
1712		return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1713	case AF_INET6:
1714		return xfrm6_addr_equal(a, b);
1715	}
1716}
1717
1718static inline int xfrm_policy_id2dir(u32 index)
1719{
1720	return index & 7;
1721}
1722
1723#ifdef CONFIG_XFRM
 
 
 
 
 
 
1724static inline int xfrm_aevent_is_on(struct net *net)
1725{
1726	struct sock *nlsk;
1727	int ret = 0;
1728
1729	rcu_read_lock();
1730	nlsk = rcu_dereference(net->xfrm.nlsk);
1731	if (nlsk)
1732		ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1733	rcu_read_unlock();
1734	return ret;
1735}
1736
1737static inline int xfrm_acquire_is_on(struct net *net)
1738{
1739	struct sock *nlsk;
1740	int ret = 0;
1741
1742	rcu_read_lock();
1743	nlsk = rcu_dereference(net->xfrm.nlsk);
1744	if (nlsk)
1745		ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1746	rcu_read_unlock();
1747
1748	return ret;
1749}
1750#endif
1751
1752static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1753{
1754	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1755}
1756
1757static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1758{
1759	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1760}
1761
1762static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1763{
1764	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1765}
1766
1767static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1768{
1769	return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1770}
1771
1772#ifdef CONFIG_XFRM_MIGRATE
1773static inline int xfrm_replay_clone(struct xfrm_state *x,
1774				     struct xfrm_state *orig)
1775{
1776
1777	x->replay_esn = kmemdup(orig->replay_esn,
1778				xfrm_replay_state_esn_len(orig->replay_esn),
1779				GFP_KERNEL);
1780	if (!x->replay_esn)
1781		return -ENOMEM;
1782	x->preplay_esn = kmemdup(orig->preplay_esn,
1783				 xfrm_replay_state_esn_len(orig->preplay_esn),
1784				 GFP_KERNEL);
1785	if (!x->preplay_esn)
1786		return -ENOMEM;
1787
1788	return 0;
1789}
1790
1791static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1792{
1793	return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1794}
1795
1796
1797static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1798{
1799	return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1800}
1801
1802static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1803{
1804	return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1805}
1806
1807static inline void xfrm_states_put(struct xfrm_state **states, int n)
1808{
1809	int i;
1810	for (i = 0; i < n; i++)
1811		xfrm_state_put(*(states + i));
1812}
1813
1814static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1815{
1816	int i;
1817	for (i = 0; i < n; i++)
1818		xfrm_state_delete(*(states + i));
1819}
1820#endif
1821
1822#ifdef CONFIG_XFRM
1823static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1824{
1825	struct sec_path *sp = skb_sec_path(skb);
1826
1827	return sp->xvec[sp->len - 1];
1828}
1829#endif
1830
1831static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1832{
1833#ifdef CONFIG_XFRM
1834	struct sec_path *sp = skb_sec_path(skb);
1835
1836	if (!sp || !sp->olen || sp->len != sp->olen)
1837		return NULL;
1838
1839	return &sp->ovec[sp->olen - 1];
1840#else
1841	return NULL;
1842#endif
1843}
1844
1845void __init xfrm_dev_init(void);
1846
1847#ifdef CONFIG_XFRM_OFFLOAD
1848void xfrm_dev_resume(struct sk_buff *skb);
1849void xfrm_dev_backlog(struct softnet_data *sd);
1850struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1851int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1852		       struct xfrm_user_offload *xuo);
 
 
 
 
1853bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1854
1855static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1856{
1857	struct xfrm_state_offload *xso = &x->xso;
1858
1859	if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1860		xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1861}
1862
1863static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1864{
1865	struct xfrm_state *x = dst->xfrm;
1866	struct xfrm_dst *xdst;
1867
1868	if (!x || !x->type_offload)
1869		return false;
1870
1871	xdst = (struct xfrm_dst *) dst;
1872	if (!x->xso.offload_handle && !xdst->child->xfrm)
1873		return true;
1874	if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1875	    !xdst->child->xfrm)
1876		return true;
1877
1878	return false;
1879}
1880
1881static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1882{
1883	struct xfrm_state_offload *xso = &x->xso;
1884
1885	if (xso->dev)
1886		xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1887}
1888
1889static inline void xfrm_dev_state_free(struct xfrm_state *x)
1890{
1891	struct xfrm_state_offload *xso = &x->xso;
1892	struct net_device *dev = xso->dev;
1893
1894	if (dev && dev->xfrmdev_ops) {
1895		if (dev->xfrmdev_ops->xdo_dev_state_free)
1896			dev->xfrmdev_ops->xdo_dev_state_free(x);
1897		xso->dev = NULL;
1898		dev_put(dev);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1899	}
1900}
1901#else
1902static inline void xfrm_dev_resume(struct sk_buff *skb)
1903{
1904}
1905
1906static inline void xfrm_dev_backlog(struct softnet_data *sd)
1907{
1908}
1909
1910static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1911{
1912	return skb;
1913}
1914
1915static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1916{
1917	return 0;
1918}
1919
1920static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1921{
1922}
1923
1924static inline void xfrm_dev_state_free(struct xfrm_state *x)
1925{
1926}
1927
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1928static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1929{
1930	return false;
1931}
1932
1933static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1934{
1935}
1936
1937static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1938{
1939	return false;
1940}
1941#endif
1942
1943static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1944{
1945	if (attrs[XFRMA_MARK])
1946		memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1947	else
1948		m->v = m->m = 0;
1949
1950	return m->v & m->m;
1951}
1952
1953static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1954{
1955	int ret = 0;
1956
1957	if (m->m | m->v)
1958		ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1959	return ret;
1960}
1961
1962static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1963{
1964	struct xfrm_mark *m = &x->props.smark;
1965
1966	return (m->v & m->m) | (mark & ~m->m);
1967}
1968
1969static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1970{
1971	int ret = 0;
1972
1973	if (if_id)
1974		ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1975	return ret;
1976}
1977
1978static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1979				    unsigned int family)
1980{
1981	bool tunnel = false;
1982
1983	switch(family) {
1984	case AF_INET:
1985		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1986			tunnel = true;
1987		break;
1988	case AF_INET6:
1989		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1990			tunnel = true;
1991		break;
1992	}
1993	if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1994		return -EINVAL;
1995
1996	return 0;
1997}
1998
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1999#if IS_ENABLED(CONFIG_IPV6)
2000static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2001{
2002	int proto;
2003
2004	if (!sk || sk->sk_family != AF_INET6)
2005		return false;
2006
2007	proto = sk->sk_protocol;
2008	if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2009		return inet6_sk(sk)->dontfrag;
2010
2011	return false;
2012}
2013#endif
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2014#endif	/* _NET_XFRM_H */