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#define XFRM_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.xfrm_statistics, field, val)
 
  55#else
  56#define XFRM_INC_STATS(net, field)	((void)(net))
  57#define XFRM_ADD_STATS(net, field, val) ((void)(net))
 
  58#endif
  59
 
  60
  61/* Organization of SPD aka "XFRM rules"
  62   ------------------------------------
  63
  64   Basic objects:
  65   - policy rule, struct xfrm_policy (=SPD entry)
  66   - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  67   - instance of a transformer, struct xfrm_state (=SA)
  68   - template to clone xfrm_state, struct xfrm_tmpl
  69
  70   SPD is plain linear list of xfrm_policy rules, ordered by priority.
  71   (To be compatible with existing pfkeyv2 implementations,
  72   many rules with priority of 0x7fffffff are allowed to exist and
  73   such rules are ordered in an unpredictable way, thanks to bsd folks.)
  74
  75   Lookup is plain linear search until the first match with selector.
  76
  77   If "action" is "block", then we prohibit the flow, otherwise:
  78   if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  79   policy entry has list of up to XFRM_MAX_DEPTH transformations,
  80   described by templates xfrm_tmpl. Each template is resolved
  81   to a complete xfrm_state (see below) and we pack bundle of transformations
  82   to a dst_entry returned to requestor.
  83
  84   dst -. xfrm  .-> xfrm_state #1
  85    |---. child .-> dst -. xfrm .-> xfrm_state #2
  86                     |---. child .-> dst -. xfrm .-> xfrm_state #3
  87                                      |---. child .-> NULL
  88
  89   Bundles are cached at xrfm_policy struct (field ->bundles).
  90
  91
  92   Resolution of xrfm_tmpl
  93   -----------------------
  94   Template contains:
  95   1. ->mode		Mode: transport or tunnel
  96   2. ->id.proto	Protocol: AH/ESP/IPCOMP
  97   3. ->id.daddr	Remote tunnel endpoint, ignored for transport mode.
  98      Q: allow to resolve security gateway?
  99   4. ->id.spi          If not zero, static SPI.
 100   5. ->saddr		Local tunnel endpoint, ignored for transport mode.
 101   6. ->algos		List of allowed algos. Plain bitmask now.
 102      Q: ealgos, aalgos, calgos. What a mess...
 103   7. ->share		Sharing mode.
 104      Q: how to implement private sharing mode? To add struct sock* to
 105      flow id?
 106
 107   Having this template we search through SAD searching for entries
 108   with appropriate mode/proto/algo, permitted by selector.
 109   If no appropriate entry found, it is requested from key manager.
 110
 111   PROBLEMS:
 112   Q: How to find all the bundles referring to a physical path for
 113      PMTU discovery? Seems, dst should contain list of all parents...
 114      and enter to infinite locking hierarchy disaster.
 115      No! It is easier, we will not search for them, let them find us.
 116      We add genid to each dst plus pointer to genid of raw IP route,
 117      pmtu disc will update pmtu on raw IP route and increase its genid.
 118      dst_check() will see this for top level and trigger resyncing
 119      metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
 120 */
 121
 122struct xfrm_state_walk {
 123	struct list_head	all;
 124	u8			state;
 125	u8			dying;
 126	u8			proto;
 
 
 127	u32			seq;
 128	struct xfrm_address_filter *filter;
 129};
 130
 131enum {
 132	XFRM_DEV_OFFLOAD_IN = 1,
 133	XFRM_DEV_OFFLOAD_OUT,
 134	XFRM_DEV_OFFLOAD_FWD,
 135};
 136
 137enum {
 138	XFRM_DEV_OFFLOAD_UNSPECIFIED,
 139	XFRM_DEV_OFFLOAD_CRYPTO,
 140	XFRM_DEV_OFFLOAD_PACKET,
 141};
 142
 143enum {
 144	XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
 145};
 146
 147struct xfrm_dev_offload {
 148	struct net_device	*dev;
 149	netdevice_tracker	dev_tracker;
 150	struct net_device	*real_dev;
 151	unsigned long		offload_handle;
 152	u8			dir : 2;
 153	u8			type : 2;
 154	u8			flags : 2;
 155};
 156
 157struct xfrm_mode {
 158	u8 encap;
 159	u8 family;
 160	u8 flags;
 161};
 162
 163/* Flags for xfrm_mode. */
 164enum {
 165	XFRM_MODE_FLAG_TUNNEL = 1,
 166};
 167
 168enum xfrm_replay_mode {
 169	XFRM_REPLAY_MODE_LEGACY,
 170	XFRM_REPLAY_MODE_BMP,
 171	XFRM_REPLAY_MODE_ESN,
 172};
 173
 174/* Full description of state of transformer. */
 175struct xfrm_state {
 176	possible_net_t		xs_net;
 
 
 177	union {
 178		struct hlist_node	gclist;
 179		struct hlist_node	bydst;
 180	};
 181	struct hlist_node	bysrc;
 182	struct hlist_node	byspi;
 183	struct hlist_node	byseq;
 184
 185	refcount_t		refcnt;
 186	spinlock_t		lock;
 187
 188	struct xfrm_id		id;
 189	struct xfrm_selector	sel;
 190	struct xfrm_mark	mark;
 191	u32			if_id;
 192	u32			tfcpad;
 193
 194	u32			genid;
 195
 196	/* Key manager bits */
 197	struct xfrm_state_walk	km;
 198
 199	/* Parameters of this state. */
 200	struct {
 201		u32		reqid;
 202		u8		mode;
 203		u8		replay_window;
 204		u8		aalgo, ealgo, calgo;
 205		u8		flags;
 206		u16		family;
 207		xfrm_address_t	saddr;
 208		int		header_len;
 209		int		trailer_len;
 210		u32		extra_flags;
 211		struct xfrm_mark	smark;
 212	} props;
 213
 214	struct xfrm_lifetime_cfg lft;
 215
 216	/* Data for transformer */
 217	struct xfrm_algo_auth	*aalg;
 218	struct xfrm_algo	*ealg;
 219	struct xfrm_algo	*calg;
 220	struct xfrm_algo_aead	*aead;
 221	const char		*geniv;
 222
 223	/* mapping change rate limiting */
 224	__be16 new_mapping_sport;
 225	u32 new_mapping;	/* seconds */
 226	u32 mapping_maxage;	/* seconds for input SA */
 227
 228	/* Data for encapsulator */
 229	struct xfrm_encap_tmpl	*encap;
 230	struct sock __rcu	*encap_sk;
 231
 232	/* Data for care-of address */
 233	xfrm_address_t	*coaddr;
 234
 235	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
 236	struct xfrm_state	*tunnel;
 237
 238	/* If a tunnel, number of users + 1 */
 239	atomic_t		tunnel_users;
 240
 241	/* State for replay detection */
 242	struct xfrm_replay_state replay;
 243	struct xfrm_replay_state_esn *replay_esn;
 244
 245	/* Replay detection state at the time we sent the last notification */
 246	struct xfrm_replay_state preplay;
 247	struct xfrm_replay_state_esn *preplay_esn;
 248
 249	/* replay detection mode */
 250	enum xfrm_replay_mode    repl_mode;
 
 251	/* internal flag that only holds state for delayed aevent at the
 252	 * moment
 253	*/
 254	u32			xflags;
 255
 256	/* Replay detection notification settings */
 257	u32			replay_maxage;
 258	u32			replay_maxdiff;
 259
 260	/* Replay detection notification timer */
 261	struct timer_list	rtimer;
 262
 263	/* Statistics */
 264	struct xfrm_stats	stats;
 265
 266	struct xfrm_lifetime_cur curlft;
 267	struct hrtimer		mtimer;
 268
 269	struct xfrm_dev_offload xso;
 270
 271	/* used to fix curlft->add_time when changing date */
 272	long		saved_tmo;
 273
 274	/* Last used time */
 275	time64_t		lastused;
 276
 277	struct page_frag xfrag;
 278
 279	/* Reference to data common to all the instances of this
 280	 * transformer. */
 281	const struct xfrm_type	*type;
 282	struct xfrm_mode	inner_mode;
 283	struct xfrm_mode	inner_mode_iaf;
 284	struct xfrm_mode	outer_mode;
 285
 286	const struct xfrm_type_offload	*type_offload;
 287
 288	/* Security context */
 289	struct xfrm_sec_ctx	*security;
 290
 291	/* Private data of this transformer, format is opaque,
 292	 * interpreted by xfrm_type methods. */
 293	void			*data;
 294};
 295
 296static inline struct net *xs_net(struct xfrm_state *x)
 297{
 298	return read_pnet(&x->xs_net);
 299}
 300
 301/* xflags - make enum if more show up */
 302#define XFRM_TIME_DEFER	1
 303#define XFRM_SOFT_EXPIRE 2
 304
 305enum {
 306	XFRM_STATE_VOID,
 307	XFRM_STATE_ACQ,
 308	XFRM_STATE_VALID,
 309	XFRM_STATE_ERROR,
 310	XFRM_STATE_EXPIRED,
 311	XFRM_STATE_DEAD
 312};
 313
 314/* callback structure passed from either netlink or pfkey */
 315struct km_event {
 316	union {
 317		u32 hard;
 318		u32 proto;
 319		u32 byid;
 320		u32 aevent;
 321		u32 type;
 322	} data;
 323
 324	u32	seq;
 325	u32	portid;
 326	u32	event;
 327	struct net *net;
 328};
 329
 330struct xfrm_if_decode_session_result {
 331	struct net *net;
 332	u32 if_id;
 333};
 334
 335struct xfrm_if_cb {
 336	bool (*decode_session)(struct sk_buff *skb,
 337			       unsigned short family,
 338			       struct xfrm_if_decode_session_result *res);
 339};
 340
 341void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
 342void xfrm_if_unregister_cb(void);
 343
 344struct net_device;
 345struct xfrm_type;
 346struct xfrm_dst;
 347struct xfrm_policy_afinfo {
 
 348	struct dst_ops		*dst_ops;
 349	struct dst_entry	*(*dst_lookup)(struct net *net,
 350					       int tos, int oif,
 351					       const xfrm_address_t *saddr,
 352					       const xfrm_address_t *daddr,
 353					       u32 mark);
 354	int			(*get_saddr)(struct net *net, int oif,
 355					     xfrm_address_t *saddr,
 356					     xfrm_address_t *daddr,
 357					     u32 mark);
 
 
 
 358	int			(*fill_dst)(struct xfrm_dst *xdst,
 359					    struct net_device *dev,
 360					    const struct flowi *fl);
 361	struct dst_entry	*(*blackhole_route)(struct net *net, struct dst_entry *orig);
 362};
 363
 364int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
 365void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
 366void km_policy_notify(struct xfrm_policy *xp, int dir,
 367		      const struct km_event *c);
 368void km_state_notify(struct xfrm_state *x, const struct km_event *c);
 369
 370struct xfrm_tmpl;
 371int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
 372	     struct xfrm_policy *pol);
 373void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 374int __xfrm_state_delete(struct xfrm_state *x);
 375
 376struct xfrm_state_afinfo {
 377	u8				family;
 378	u8				proto;
 379
 380	const struct xfrm_type_offload *type_offload_esp;
 381
 382	const struct xfrm_type		*type_esp;
 383	const struct xfrm_type		*type_ipip;
 384	const struct xfrm_type		*type_ipip6;
 385	const struct xfrm_type		*type_comp;
 386	const struct xfrm_type		*type_ah;
 387	const struct xfrm_type		*type_routing;
 388	const struct xfrm_type		*type_dstopts;
 389
 390	int			(*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
 
 
 
 
 
 
 
 391	int			(*transport_finish)(struct sk_buff *skb,
 392						    int async);
 393	void			(*local_error)(struct sk_buff *skb, u32 mtu);
 394};
 395
 396int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 397int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 398struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
 399struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
 400
 401struct xfrm_input_afinfo {
 402	u8			family;
 403	bool			is_ipip;
 404	int			(*callback)(struct sk_buff *skb, u8 protocol,
 405					    int err);
 406};
 407
 408int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
 409int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
 410
 411void xfrm_flush_gc(void);
 412void xfrm_state_delete_tunnel(struct xfrm_state *x);
 413
 414struct xfrm_type {
 
 415	struct module		*owner;
 416	u8			proto;
 417	u8			flags;
 418#define XFRM_TYPE_NON_FRAGMENT	1
 419#define XFRM_TYPE_REPLAY_PROT	2
 420#define XFRM_TYPE_LOCAL_COADDR	4
 421#define XFRM_TYPE_REMOTE_COADDR	8
 422
 423	int			(*init_state)(struct xfrm_state *x,
 424					      struct netlink_ext_ack *extack);
 425	void			(*destructor)(struct xfrm_state *);
 426	int			(*input)(struct xfrm_state *, struct sk_buff *skb);
 427	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
 428	int			(*reject)(struct xfrm_state *, struct sk_buff *,
 429					  const struct flowi *);
 
 
 
 430};
 431
 432int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 433void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 434
 435struct xfrm_type_offload {
 436	struct module	*owner;
 437	u8		proto;
 438	void		(*encap)(struct xfrm_state *, struct sk_buff *pskb);
 439	int		(*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
 440	int		(*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 441};
 442
 443int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
 444void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
 
 
 
 
 
 445
 446static inline int xfrm_af2proto(unsigned int family)
 447{
 448	switch(family) {
 449	case AF_INET:
 450		return IPPROTO_IPIP;
 451	case AF_INET6:
 452		return IPPROTO_IPV6;
 453	default:
 454		return 0;
 455	}
 456}
 457
 458static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 459{
 460	if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 461	    (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 462		return &x->inner_mode;
 463	else
 464		return &x->inner_mode_iaf;
 465}
 466
 467struct xfrm_tmpl {
 468/* id in template is interpreted as:
 469 * daddr - destination of tunnel, may be zero for transport mode.
 470 * spi   - zero to acquire spi. Not zero if spi is static, then
 471 *	   daddr must be fixed too.
 472 * proto - AH/ESP/IPCOMP
 473 */
 474	struct xfrm_id		id;
 475
 476/* Source address of tunnel. Ignored, if it is not a tunnel. */
 477	xfrm_address_t		saddr;
 478
 479	unsigned short		encap_family;
 480
 481	u32			reqid;
 482
 483/* Mode: transport, tunnel etc. */
 484	u8			mode;
 485
 486/* Sharing mode: unique, this session only, this user only etc. */
 487	u8			share;
 488
 489/* May skip this transfomration if no SA is found */
 490	u8			optional;
 491
 492/* Skip aalgos/ealgos/calgos checks. */
 493	u8			allalgs;
 494
 495/* Bit mask of algos allowed for acquisition */
 496	u32			aalgos;
 497	u32			ealgos;
 498	u32			calgos;
 499};
 500
 501#define XFRM_MAX_DEPTH		6
 502#define XFRM_MAX_OFFLOAD_DEPTH	1
 503
 504struct xfrm_policy_walk_entry {
 505	struct list_head	all;
 506	u8			dead;
 507};
 508
 509struct xfrm_policy_walk {
 510	struct xfrm_policy_walk_entry walk;
 511	u8 type;
 512	u32 seq;
 513};
 514
 515struct xfrm_policy_queue {
 516	struct sk_buff_head	hold_queue;
 517	struct timer_list	hold_timer;
 518	unsigned long		timeout;
 519};
 520
 521struct xfrm_policy {
 522	possible_net_t		xp_net;
 
 
 523	struct hlist_node	bydst;
 524	struct hlist_node	byidx;
 525
 526	/* This lock only affects elements except for entry. */
 527	rwlock_t		lock;
 528	refcount_t		refcnt;
 529	u32			pos;
 530	struct timer_list	timer;
 531
 
 532	atomic_t		genid;
 533	u32			priority;
 534	u32			index;
 535	u32			if_id;
 536	struct xfrm_mark	mark;
 537	struct xfrm_selector	selector;
 538	struct xfrm_lifetime_cfg lft;
 539	struct xfrm_lifetime_cur curlft;
 540	struct xfrm_policy_walk_entry walk;
 541	struct xfrm_policy_queue polq;
 542	bool                    bydst_reinsert;
 543	u8			type;
 544	u8			action;
 545	u8			flags;
 546	u8			xfrm_nr;
 547	u16			family;
 548	struct xfrm_sec_ctx	*security;
 549	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
 550	struct hlist_node	bydst_inexact_list;
 551	struct rcu_head		rcu;
 552
 553	struct xfrm_dev_offload xdo;
 554};
 555
 556static inline struct net *xp_net(const struct xfrm_policy *xp)
 557{
 558	return read_pnet(&xp->xp_net);
 559}
 560
 561struct xfrm_kmaddress {
 562	xfrm_address_t          local;
 563	xfrm_address_t          remote;
 564	u32			reserved;
 565	u16			family;
 566};
 567
 568struct xfrm_migrate {
 569	xfrm_address_t		old_daddr;
 570	xfrm_address_t		old_saddr;
 571	xfrm_address_t		new_daddr;
 572	xfrm_address_t		new_saddr;
 573	u8			proto;
 574	u8			mode;
 575	u16			reserved;
 576	u32			reqid;
 577	u16			old_family;
 578	u16			new_family;
 579};
 580
 581#define XFRM_KM_TIMEOUT                30
 
 
 
 
 582/* what happened */
 583#define XFRM_REPLAY_UPDATE	XFRM_AE_CR
 584#define XFRM_REPLAY_TIMEOUT	XFRM_AE_CE
 585
 586/* default aevent timeout in units of 100ms */
 587#define XFRM_AE_ETIME			10
 588/* Async Event timer multiplier */
 589#define XFRM_AE_ETH_M			10
 590/* default seq threshold size */
 591#define XFRM_AE_SEQT_SIZE		2
 592
 593struct xfrm_mgr {
 594	struct list_head	list;
 
 595	int			(*notify)(struct xfrm_state *x, const struct km_event *c);
 596	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
 597	struct xfrm_policy	*(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 598	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 599	int			(*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
 600	int			(*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 601	int			(*migrate)(const struct xfrm_selector *sel,
 602					   u8 dir, u8 type,
 603					   const struct xfrm_migrate *m,
 604					   int num_bundles,
 605					   const struct xfrm_kmaddress *k,
 606					   const struct xfrm_encap_tmpl *encap);
 607	bool			(*is_alive)(const struct km_event *c);
 608};
 609
 610void xfrm_register_km(struct xfrm_mgr *km);
 611void xfrm_unregister_km(struct xfrm_mgr *km);
 612
 613struct xfrm_tunnel_skb_cb {
 614	union {
 615		struct inet_skb_parm h4;
 616		struct inet6_skb_parm h6;
 617	} header;
 618
 619	union {
 620		struct ip_tunnel *ip4;
 621		struct ip6_tnl *ip6;
 622	} tunnel;
 623};
 624
 625#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
 
 626
 627/*
 628 * This structure is used for the duration where packets are being
 629 * transformed by IPsec.  As soon as the packet leaves IPsec the
 630 * area beyond the generic IP part may be overwritten.
 631 */
 632struct xfrm_skb_cb {
 633	struct xfrm_tunnel_skb_cb header;
 
 
 
 634
 635        /* Sequence number for replay protection. */
 636	union {
 637		struct {
 638			__u32 low;
 639			__u32 hi;
 640		} output;
 641		struct {
 642			__be32 low;
 643			__be32 hi;
 644		} input;
 645	} seq;
 646};
 647
 648#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 649
 650/*
 651 * This structure is used by the afinfo prepare_input/prepare_output functions
 652 * to transmit header information to the mode input/output functions.
 653 */
 654struct xfrm_mode_skb_cb {
 655	struct xfrm_tunnel_skb_cb header;
 
 
 
 656
 657	/* Copied from header for IPv4, always set to zero and DF for IPv6. */
 658	__be16 id;
 659	__be16 frag_off;
 660
 661	/* IP header length (excluding options or extension headers). */
 662	u8 ihl;
 663
 664	/* TOS for IPv4, class for IPv6. */
 665	u8 tos;
 666
 667	/* TTL for IPv4, hop limitfor IPv6. */
 668	u8 ttl;
 669
 670	/* Protocol for IPv4, NH for IPv6. */
 671	u8 protocol;
 672
 673	/* Option length for IPv4, zero for IPv6. */
 674	u8 optlen;
 675
 676	/* Used by IPv6 only, zero for IPv4. */
 677	u8 flow_lbl[3];
 678};
 679
 680#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 681
 682/*
 683 * This structure is used by the input processing to locate the SPI and
 684 * related information.
 685 */
 686struct xfrm_spi_skb_cb {
 687	struct xfrm_tunnel_skb_cb header;
 
 
 
 688
 689	unsigned int daddroff;
 690	unsigned int family;
 691	__be32 seq;
 692};
 693
 694#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 695
 
 
 
 
 
 
 
 696#ifdef CONFIG_AUDITSYSCALL
 697static inline struct audit_buffer *xfrm_audit_start(const char *op)
 698{
 699	struct audit_buffer *audit_buf = NULL;
 700
 701	if (audit_enabled == AUDIT_OFF)
 702		return NULL;
 703	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
 704				    AUDIT_MAC_IPSEC_EVENT);
 705	if (audit_buf == NULL)
 706		return NULL;
 707	audit_log_format(audit_buf, "op=%s", op);
 708	return audit_buf;
 709}
 710
 711static inline void xfrm_audit_helper_usrinfo(bool task_valid,
 712					     struct audit_buffer *audit_buf)
 713{
 714	const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
 715					    audit_get_loginuid(current) :
 716					    INVALID_UID);
 717	const unsigned int ses = task_valid ? audit_get_sessionid(current) :
 718		AUDIT_SID_UNSET;
 719
 720	audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 721	audit_log_task_context(audit_buf);
 722}
 723
 724void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
 725void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 726			      bool task_valid);
 727void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
 728void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
 729void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 730				      struct sk_buff *skb);
 731void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
 732			     __be32 net_seq);
 733void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 734void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
 735			       __be32 net_seq);
 736void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
 737			      u8 proto);
 
 
 
 
 
 
 
 
 738#else
 739
 740static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 741					 bool task_valid)
 742{
 743}
 744
 745static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 746					    bool task_valid)
 747{
 748}
 749
 750static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 751					bool task_valid)
 752{
 753}
 754
 755static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 756					   bool task_valid)
 757{
 758}
 759
 760static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 761					     struct sk_buff *skb)
 762{
 763}
 764
 765static inline void xfrm_audit_state_replay(struct xfrm_state *x,
 766					   struct sk_buff *skb, __be32 net_seq)
 767{
 768}
 769
 770static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 771				      u16 family)
 772{
 773}
 774
 775static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 776				      __be32 net_spi, __be32 net_seq)
 777{
 778}
 779
 780static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 781				     struct sk_buff *skb, u8 proto)
 782{
 783}
 784#endif /* CONFIG_AUDITSYSCALL */
 785
 786static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 787{
 788	if (likely(policy != NULL))
 789		refcount_inc(&policy->refcnt);
 790}
 791
 792void xfrm_policy_destroy(struct xfrm_policy *policy);
 793
 794static inline void xfrm_pol_put(struct xfrm_policy *policy)
 795{
 796	if (refcount_dec_and_test(&policy->refcnt))
 797		xfrm_policy_destroy(policy);
 798}
 799
 800static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 801{
 802	int i;
 803	for (i = npols - 1; i >= 0; --i)
 804		xfrm_pol_put(pols[i]);
 805}
 806
 807void __xfrm_state_destroy(struct xfrm_state *, bool);
 808
 809static inline void __xfrm_state_put(struct xfrm_state *x)
 810{
 811	refcount_dec(&x->refcnt);
 812}
 813
 814static inline void xfrm_state_put(struct xfrm_state *x)
 815{
 816	if (refcount_dec_and_test(&x->refcnt))
 817		__xfrm_state_destroy(x, false);
 818}
 819
 820static inline void xfrm_state_put_sync(struct xfrm_state *x)
 821{
 822	if (refcount_dec_and_test(&x->refcnt))
 823		__xfrm_state_destroy(x, true);
 824}
 825
 826static inline void xfrm_state_hold(struct xfrm_state *x)
 827{
 828	refcount_inc(&x->refcnt);
 829}
 830
 831static inline bool addr_match(const void *token1, const void *token2,
 832			      unsigned int prefixlen)
 833{
 834	const __be32 *a1 = token1;
 835	const __be32 *a2 = token2;
 836	unsigned int pdw;
 837	unsigned int pbi;
 838
 839	pdw = prefixlen >> 5;	  /* num of whole u32 in prefix */
 840	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 841
 842	if (pdw)
 843		if (memcmp(a1, a2, pdw << 2))
 844			return false;
 845
 846	if (pbi) {
 847		__be32 mask;
 848
 849		mask = htonl((0xffffffff) << (32 - pbi));
 850
 851		if ((a1[pdw] ^ a2[pdw]) & mask)
 852			return false;
 853	}
 854
 855	return true;
 856}
 857
 858static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
 859{
 860	/* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
 861	if (sizeof(long) == 4 && prefixlen == 0)
 862		return true;
 863	return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
 864}
 865
 866static __inline__
 867__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
 868{
 869	__be16 port;
 870	switch(fl->flowi_proto) {
 871	case IPPROTO_TCP:
 872	case IPPROTO_UDP:
 873	case IPPROTO_UDPLITE:
 874	case IPPROTO_SCTP:
 875		port = uli->ports.sport;
 876		break;
 877	case IPPROTO_ICMP:
 878	case IPPROTO_ICMPV6:
 879		port = htons(uli->icmpt.type);
 880		break;
 881	case IPPROTO_MH:
 882		port = htons(uli->mht.type);
 883		break;
 884	case IPPROTO_GRE:
 885		port = htons(ntohl(uli->gre_key) >> 16);
 886		break;
 887	default:
 888		port = 0;	/*XXX*/
 889	}
 890	return port;
 891}
 892
 893static __inline__
 894__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
 895{
 896	__be16 port;
 897	switch(fl->flowi_proto) {
 898	case IPPROTO_TCP:
 899	case IPPROTO_UDP:
 900	case IPPROTO_UDPLITE:
 901	case IPPROTO_SCTP:
 902		port = uli->ports.dport;
 903		break;
 904	case IPPROTO_ICMP:
 905	case IPPROTO_ICMPV6:
 906		port = htons(uli->icmpt.code);
 907		break;
 908	case IPPROTO_GRE:
 909		port = htons(ntohl(uli->gre_key) & 0xffff);
 910		break;
 911	default:
 912		port = 0;	/*XXX*/
 913	}
 914	return port;
 915}
 916
 917bool xfrm_selector_match(const struct xfrm_selector *sel,
 918			 const struct flowi *fl, unsigned short family);
 
 919
 920#ifdef CONFIG_SECURITY_NETWORK_XFRM
 921/*	If neither has a context --> match
 922 * 	Otherwise, both must have a context and the sids, doi, alg must match
 923 */
 924static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 925{
 926	return ((!s1 && !s2) ||
 927		(s1 && s2 &&
 928		 (s1->ctx_sid == s2->ctx_sid) &&
 929		 (s1->ctx_doi == s2->ctx_doi) &&
 930		 (s1->ctx_alg == s2->ctx_alg)));
 931}
 932#else
 933static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 934{
 935	return true;
 936}
 937#endif
 938
 939/* A struct encoding bundle of transformations to apply to some set of flow.
 940 *
 941 * xdst->child points to the next element of bundle.
 942 * dst->xfrm  points to an instanse of transformer.
 943 *
 944 * Due to unfortunate limitations of current routing cache, which we
 945 * have no time to fix, it mirrors struct rtable and bound to the same
 946 * routing key, including saddr,daddr. However, we can have many of
 947 * bundles differing by session id. All the bundles grow from a parent
 948 * policy rule.
 949 */
 950struct xfrm_dst {
 951	union {
 952		struct dst_entry	dst;
 953		struct rtable		rt;
 954		struct rt6_info		rt6;
 955	} u;
 956	struct dst_entry *route;
 957	struct dst_entry *child;
 958	struct dst_entry *path;
 959	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
 960	int num_pols, num_xfrms;
 
 
 
 
 961	u32 xfrm_genid;
 962	u32 policy_genid;
 963	u32 route_mtu_cached;
 964	u32 child_mtu_cached;
 965	u32 route_cookie;
 966	u32 path_cookie;
 967};
 968
 969static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
 970{
 971#ifdef CONFIG_XFRM
 972	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
 973		const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
 974
 975		return xdst->path;
 976	}
 977#endif
 978	return (struct dst_entry *) dst;
 979}
 980
 981static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
 982{
 983#ifdef CONFIG_XFRM
 984	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
 985		struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
 986		return xdst->child;
 987	}
 988#endif
 989	return NULL;
 990}
 991
 992#ifdef CONFIG_XFRM
 993static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
 994{
 995	xdst->child = child;
 996}
 997
 998static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 999{
1000	xfrm_pols_put(xdst->pols, xdst->num_pols);
1001	dst_release(xdst->route);
1002	if (likely(xdst->u.dst.xfrm))
1003		xfrm_state_put(xdst->u.dst.xfrm);
 
 
 
 
 
 
1004}
1005#endif
1006
1007void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1008
1009struct xfrm_if_parms {
1010	int link;		/* ifindex of underlying L2 interface */
1011	u32 if_id;		/* interface identifyer */
1012	bool collect_md;
1013};
1014
1015struct xfrm_if {
1016	struct xfrm_if __rcu *next;	/* next interface in list */
1017	struct net_device *dev;		/* virtual device associated with interface */
1018	struct net *net;		/* netns for packet i/o */
1019	struct xfrm_if_parms p;		/* interface parms */
1020
1021	struct gro_cells gro_cells;
 
 
 
1022};
1023
1024struct xfrm_offload {
1025	/* Output sequence number for replay protection on offloading. */
1026	struct {
1027		__u32 low;
1028		__u32 hi;
1029	} seq;
1030
1031	__u32			flags;
1032#define	SA_DELETE_REQ		1
1033#define	CRYPTO_DONE		2
1034#define	CRYPTO_NEXT_DONE	4
1035#define	CRYPTO_FALLBACK		8
1036#define	XFRM_GSO_SEGMENT	16
1037#define	XFRM_GRO		32
1038/* 64 is free */
1039#define	XFRM_DEV_RESUME		128
1040#define	XFRM_XMIT		256
1041
1042	__u32			status;
1043#define CRYPTO_SUCCESS				1
1044#define CRYPTO_GENERIC_ERROR			2
1045#define CRYPTO_TRANSPORT_AH_AUTH_FAILED		4
1046#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED	8
1047#define CRYPTO_TUNNEL_AH_AUTH_FAILED		16
1048#define CRYPTO_TUNNEL_ESP_AUTH_FAILED		32
1049#define CRYPTO_INVALID_PACKET_SYNTAX		64
1050#define CRYPTO_INVALID_PROTOCOL			128
1051
1052	/* Used to keep whole l2 header for transport mode GRO */
1053	__u32			orig_mac_len;
1054
1055	__u8			proto;
1056	__u8			inner_ipproto;
1057};
 
 
 
 
1058
1059struct sec_path {
1060	int			len;
1061	int			olen;
1062	int			verified_cnt;
1063
1064	struct xfrm_state	*xvec[XFRM_MAX_DEPTH];
1065	struct xfrm_offload	ovec[XFRM_MAX_OFFLOAD_DEPTH];
1066};
 
 
 
1067
1068struct sec_path *secpath_set(struct sk_buff *skb);
1069
1070static inline void
1071secpath_reset(struct sk_buff *skb)
1072{
1073#ifdef CONFIG_XFRM
1074	skb_ext_del(skb, SKB_EXT_SEC_PATH);
 
1075#endif
1076}
1077
1078static inline int
1079xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1080{
1081	switch (family) {
1082	case AF_INET:
1083		return addr->a4 == 0;
1084	case AF_INET6:
1085		return ipv6_addr_any(&addr->in6);
1086	}
1087	return 0;
1088}
1089
1090static inline int
1091__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1092{
1093	return	(tmpl->saddr.a4 &&
1094		 tmpl->saddr.a4 != x->props.saddr.a4);
1095}
1096
1097static inline int
1098__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1099{
1100	return	(!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1101		 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1102}
1103
1104static inline int
1105xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1106{
1107	switch (family) {
1108	case AF_INET:
1109		return __xfrm4_state_addr_cmp(tmpl, x);
1110	case AF_INET6:
1111		return __xfrm6_state_addr_cmp(tmpl, x);
1112	}
1113	return !0;
1114}
1115
1116#ifdef CONFIG_XFRM
1117static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1118{
1119	struct sec_path *sp = skb_sec_path(skb);
1120
1121	return sp->xvec[sp->len - 1];
1122}
1123#endif
1124
1125static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1126{
1127#ifdef CONFIG_XFRM
1128	struct sec_path *sp = skb_sec_path(skb);
1129
1130	if (!sp || !sp->olen || sp->len != sp->olen)
1131		return NULL;
1132
1133	return &sp->ovec[sp->olen - 1];
1134#else
1135	return NULL;
1136#endif
1137}
1138
1139#ifdef CONFIG_XFRM
1140int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1141			unsigned short family);
1142
1143static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1144					 int dir)
1145{
1146	if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1147		return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1148
1149	return false;
1150}
1151
1152static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1153					     int dir, unsigned short family)
1154{
1155	if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1156		/* same dst may be used for traffic originating from
1157		 * devices with different policy settings.
1158		 */
1159		return IPCB(skb)->flags & IPSKB_NOPOLICY;
1160	}
1161	return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1162}
1163
1164static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1165				       struct sk_buff *skb,
1166				       unsigned int family, int reverse)
1167{
1168	struct net *net = dev_net(skb->dev);
1169	int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1170	struct xfrm_offload *xo = xfrm_offload(skb);
1171	struct xfrm_state *x;
1172
1173	if (sk && sk->sk_policy[XFRM_POLICY_IN])
1174		return __xfrm_policy_check(sk, ndir, skb, family);
1175
1176	if (xo) {
1177		x = xfrm_input_state(skb);
1178		if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1179			return (xo->flags & CRYPTO_DONE) &&
1180			       (xo->status & CRYPTO_SUCCESS);
1181	}
1182
1183	return __xfrm_check_nopolicy(net, skb, dir) ||
1184	       __xfrm_check_dev_nopolicy(skb, dir, family) ||
1185	       __xfrm_policy_check(sk, ndir, skb, family);
1186}
1187
1188static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1189{
1190	return __xfrm_policy_check2(sk, dir, skb, family, 0);
1191}
1192
1193static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1194{
1195	return xfrm_policy_check(sk, dir, skb, AF_INET);
1196}
1197
1198static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1199{
1200	return xfrm_policy_check(sk, dir, skb, AF_INET6);
1201}
1202
1203static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1204					     struct sk_buff *skb)
1205{
1206	return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1207}
1208
1209static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1210					     struct sk_buff *skb)
1211{
1212	return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1213}
1214
1215int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1216			  unsigned int family, int reverse);
1217
1218static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1219				      unsigned int family)
1220{
1221	return __xfrm_decode_session(net, skb, fl, family, 0);
1222}
1223
1224static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1225					      struct flowi *fl,
1226					      unsigned int family)
1227{
1228	return __xfrm_decode_session(net, skb, fl, family, 1);
1229}
1230
1231int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1232
1233static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1234{
1235	struct net *net = dev_net(skb->dev);
1236
1237	if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1238	    net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1239		return true;
1240
1241	return (skb_dst(skb)->flags & DST_NOXFRM) ||
1242	       __xfrm_route_forward(skb, family);
1243}
1244
1245static inline int xfrm4_route_forward(struct sk_buff *skb)
1246{
1247	return xfrm_route_forward(skb, AF_INET);
1248}
1249
1250static inline int xfrm6_route_forward(struct sk_buff *skb)
1251{
1252	return xfrm_route_forward(skb, AF_INET6);
1253}
1254
1255int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1256
1257static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1258{
1259	if (!sk_fullsock(osk))
1260		return 0;
1261	sk->sk_policy[0] = NULL;
1262	sk->sk_policy[1] = NULL;
1263	if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1264		return __xfrm_sk_clone_policy(sk, osk);
1265	return 0;
1266}
1267
1268int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1269
1270static inline void xfrm_sk_free_policy(struct sock *sk)
1271{
1272	struct xfrm_policy *pol;
1273
1274	pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1275	if (unlikely(pol != NULL)) {
1276		xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1277		sk->sk_policy[0] = NULL;
1278	}
1279	pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1280	if (unlikely(pol != NULL)) {
1281		xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1282		sk->sk_policy[1] = NULL;
1283	}
1284}
1285
1286#else
1287
1288static inline void xfrm_sk_free_policy(struct sock *sk) {}
1289static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1290static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1291static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1292static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1293{
1294	return 1;
1295}
1296static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1297{
1298	return 1;
1299}
1300static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1301{
1302	return 1;
1303}
1304static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1305					      struct flowi *fl,
1306					      unsigned int family)
1307{
1308	return -ENOSYS;
1309}
1310static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1311					     struct sk_buff *skb)
1312{
1313	return 1;
1314}
1315static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1316					     struct sk_buff *skb)
1317{
1318	return 1;
1319}
1320#endif
1321
1322static __inline__
1323xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1324{
1325	switch (family){
1326	case AF_INET:
1327		return (xfrm_address_t *)&fl->u.ip4.daddr;
1328	case AF_INET6:
1329		return (xfrm_address_t *)&fl->u.ip6.daddr;
1330	}
1331	return NULL;
1332}
1333
1334static __inline__
1335xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1336{
1337	switch (family){
1338	case AF_INET:
1339		return (xfrm_address_t *)&fl->u.ip4.saddr;
1340	case AF_INET6:
1341		return (xfrm_address_t *)&fl->u.ip6.saddr;
1342	}
1343	return NULL;
1344}
1345
1346static __inline__
1347void xfrm_flowi_addr_get(const struct flowi *fl,
1348			 xfrm_address_t *saddr, xfrm_address_t *daddr,
1349			 unsigned short family)
1350{
1351	switch(family) {
1352	case AF_INET:
1353		memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1354		memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1355		break;
1356	case AF_INET6:
1357		saddr->in6 = fl->u.ip6.saddr;
1358		daddr->in6 = fl->u.ip6.daddr;
1359		break;
1360	}
1361}
1362
1363static __inline__ int
1364__xfrm4_state_addr_check(const struct xfrm_state *x,
1365			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1366{
1367	if (daddr->a4 == x->id.daddr.a4 &&
1368	    (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1369		return 1;
1370	return 0;
1371}
1372
1373static __inline__ int
1374__xfrm6_state_addr_check(const struct xfrm_state *x,
1375			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1376{
1377	if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1378	    (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1379	     ipv6_addr_any((struct in6_addr *)saddr) ||
1380	     ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1381		return 1;
1382	return 0;
1383}
1384
1385static __inline__ int
1386xfrm_state_addr_check(const struct xfrm_state *x,
1387		      const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1388		      unsigned short family)
1389{
1390	switch (family) {
1391	case AF_INET:
1392		return __xfrm4_state_addr_check(x, daddr, saddr);
1393	case AF_INET6:
1394		return __xfrm6_state_addr_check(x, daddr, saddr);
1395	}
1396	return 0;
1397}
1398
1399static __inline__ int
1400xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1401			   unsigned short family)
1402{
1403	switch (family) {
1404	case AF_INET:
1405		return __xfrm4_state_addr_check(x,
1406						(const xfrm_address_t *)&fl->u.ip4.daddr,
1407						(const xfrm_address_t *)&fl->u.ip4.saddr);
1408	case AF_INET6:
1409		return __xfrm6_state_addr_check(x,
1410						(const xfrm_address_t *)&fl->u.ip6.daddr,
1411						(const xfrm_address_t *)&fl->u.ip6.saddr);
1412	}
1413	return 0;
1414}
1415
1416static inline int xfrm_state_kern(const struct xfrm_state *x)
1417{
1418	return atomic_read(&x->tunnel_users);
1419}
1420
1421static inline bool xfrm_id_proto_valid(u8 proto)
1422{
1423	switch (proto) {
1424	case IPPROTO_AH:
1425	case IPPROTO_ESP:
1426	case IPPROTO_COMP:
1427#if IS_ENABLED(CONFIG_IPV6)
1428	case IPPROTO_ROUTING:
1429	case IPPROTO_DSTOPTS:
1430#endif
1431		return true;
1432	default:
1433		return false;
1434	}
1435}
1436
1437/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1438static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1439{
1440	return (!userproto || proto == userproto ||
1441		(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1442						  proto == IPPROTO_ESP ||
1443						  proto == IPPROTO_COMP)));
1444}
1445
1446/*
1447 * xfrm algorithm information
1448 */
1449struct xfrm_algo_aead_info {
1450	char *geniv;
1451	u16 icv_truncbits;
1452};
1453
1454struct xfrm_algo_auth_info {
1455	u16 icv_truncbits;
1456	u16 icv_fullbits;
1457};
1458
1459struct xfrm_algo_encr_info {
1460	char *geniv;
1461	u16 blockbits;
1462	u16 defkeybits;
1463};
1464
1465struct xfrm_algo_comp_info {
1466	u16 threshold;
1467};
1468
1469struct xfrm_algo_desc {
1470	char *name;
1471	char *compat;
1472	u8 available:1;
1473	u8 pfkey_supported:1;
1474	union {
1475		struct xfrm_algo_aead_info aead;
1476		struct xfrm_algo_auth_info auth;
1477		struct xfrm_algo_encr_info encr;
1478		struct xfrm_algo_comp_info comp;
1479	} uinfo;
1480	struct sadb_alg desc;
1481};
1482
1483/* XFRM protocol handlers.  */
1484struct xfrm4_protocol {
1485	int (*handler)(struct sk_buff *skb);
1486	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1487			     int encap_type);
1488	int (*cb_handler)(struct sk_buff *skb, int err);
1489	int (*err_handler)(struct sk_buff *skb, u32 info);
1490
1491	struct xfrm4_protocol __rcu *next;
1492	int priority;
1493};
1494
1495struct xfrm6_protocol {
1496	int (*handler)(struct sk_buff *skb);
1497	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1498			     int encap_type);
1499	int (*cb_handler)(struct sk_buff *skb, int err);
1500	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1501			   u8 type, u8 code, int offset, __be32 info);
1502
1503	struct xfrm6_protocol __rcu *next;
1504	int priority;
1505};
1506
1507/* XFRM tunnel handlers.  */
1508struct xfrm_tunnel {
1509	int (*handler)(struct sk_buff *skb);
1510	int (*cb_handler)(struct sk_buff *skb, int err);
1511	int (*err_handler)(struct sk_buff *skb, u32 info);
1512
1513	struct xfrm_tunnel __rcu *next;
1514	int priority;
1515};
1516
1517struct xfrm6_tunnel {
1518	int (*handler)(struct sk_buff *skb);
1519	int (*cb_handler)(struct sk_buff *skb, int err);
1520	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1521			   u8 type, u8 code, int offset, __be32 info);
1522	struct xfrm6_tunnel __rcu *next;
1523	int priority;
1524};
1525
1526void xfrm_init(void);
1527void xfrm4_init(void);
1528int xfrm_state_init(struct net *net);
1529void xfrm_state_fini(struct net *net);
1530void xfrm4_state_init(void);
1531void xfrm4_protocol_init(void);
1532#ifdef CONFIG_XFRM
1533int xfrm6_init(void);
1534void xfrm6_fini(void);
1535int xfrm6_state_init(void);
1536void xfrm6_state_fini(void);
1537int xfrm6_protocol_init(void);
1538void xfrm6_protocol_fini(void);
1539#else
1540static inline int xfrm6_init(void)
1541{
1542	return 0;
1543}
1544static inline void xfrm6_fini(void)
1545{
1546	;
1547}
1548#endif
1549
1550#ifdef CONFIG_XFRM_STATISTICS
1551int xfrm_proc_init(struct net *net);
1552void xfrm_proc_fini(struct net *net);
1553#endif
1554
1555int xfrm_sysctl_init(struct net *net);
1556#ifdef CONFIG_SYSCTL
1557void xfrm_sysctl_fini(struct net *net);
1558#else
1559static inline void xfrm_sysctl_fini(struct net *net)
1560{
1561}
1562#endif
1563
1564void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1565			  struct xfrm_address_filter *filter);
1566int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1567		    int (*func)(struct xfrm_state *, int, void*), void *);
1568void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1569struct xfrm_state *xfrm_state_alloc(struct net *net);
1570void xfrm_state_free(struct xfrm_state *x);
1571struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1572				   const xfrm_address_t *saddr,
1573				   const struct flowi *fl,
1574				   struct xfrm_tmpl *tmpl,
1575				   struct xfrm_policy *pol, int *err,
1576				   unsigned short family, u32 if_id);
1577struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1578				       xfrm_address_t *daddr,
1579				       xfrm_address_t *saddr,
1580				       unsigned short family,
1581				       u8 mode, u8 proto, u32 reqid);
1582struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1583					      unsigned short family);
1584int xfrm_state_check_expire(struct xfrm_state *x);
1585void xfrm_state_update_stats(struct net *net);
1586#ifdef CONFIG_XFRM_OFFLOAD
1587static inline void xfrm_dev_state_update_stats(struct xfrm_state *x)
1588{
1589	struct xfrm_dev_offload *xdo = &x->xso;
1590	struct net_device *dev = xdo->dev;
1591
1592	if (dev && dev->xfrmdev_ops &&
1593	    dev->xfrmdev_ops->xdo_dev_state_update_stats)
1594		dev->xfrmdev_ops->xdo_dev_state_update_stats(x);
1595
1596}
1597#else
1598static inline void xfrm_dev_state_update_stats(struct xfrm_state *x) {}
1599#endif
1600void xfrm_state_insert(struct xfrm_state *x);
1601int xfrm_state_add(struct xfrm_state *x);
1602int xfrm_state_update(struct xfrm_state *x);
1603struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1604				     const xfrm_address_t *daddr, __be32 spi,
1605				     u8 proto, unsigned short family);
1606struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1607					    const xfrm_address_t *daddr,
1608					    const xfrm_address_t *saddr,
1609					    u8 proto,
1610					    unsigned short family);
1611#ifdef CONFIG_XFRM_SUB_POLICY
1612void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1613		    unsigned short family);
1614void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1615		     unsigned short family);
1616#else
1617static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1618				  int n, unsigned short family)
1619{
 
1620}
1621
1622static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1623				   int n, unsigned short family)
1624{
 
1625}
1626#endif
1627
1628struct xfrmk_sadinfo {
1629	u32 sadhcnt; /* current hash bkts */
1630	u32 sadhmcnt; /* max allowed hash bkts */
1631	u32 sadcnt; /* current running count */
1632};
1633
1634struct xfrmk_spdinfo {
1635	u32 incnt;
1636	u32 outcnt;
1637	u32 fwdcnt;
1638	u32 inscnt;
1639	u32 outscnt;
1640	u32 fwdscnt;
1641	u32 spdhcnt;
1642	u32 spdhmcnt;
1643};
1644
1645struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1646int xfrm_state_delete(struct xfrm_state *x);
1647int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1648int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1649int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1650			  bool task_valid);
1651void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1652void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1653u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1654int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1655u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1656int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1657		      struct netlink_ext_ack *extack);
1658int xfrm_init_state(struct xfrm_state *x);
1659int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1660int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1661int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1662			 int (*finish)(struct net *, struct sock *,
1663				       struct sk_buff *));
1664int xfrm_trans_queue(struct sk_buff *skb,
1665		     int (*finish)(struct net *, struct sock *,
1666				   struct sk_buff *));
1667int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1668int xfrm_output(struct sock *sk, struct sk_buff *skb);
1669
1670#if IS_ENABLED(CONFIG_NET_PKTGEN)
1671int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1672#endif
1673
1674void xfrm_local_error(struct sk_buff *skb, int mtu);
1675int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1676		    int encap_type);
1677int xfrm4_transport_finish(struct sk_buff *skb, int async);
1678int xfrm4_rcv(struct sk_buff *skb);
1679
1680static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1681{
1682	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1683	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1684	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1685	return xfrm_input(skb, nexthdr, spi, 0);
1686}
1687
1688int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1689int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1690int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1691int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1692int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1693void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1694int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1695		  struct ip6_tnl *t);
1696int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1697		    int encap_type);
1698int xfrm6_transport_finish(struct sk_buff *skb, int async);
1699int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1700int xfrm6_rcv(struct sk_buff *skb);
1701int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1702		     xfrm_address_t *saddr, u8 proto);
1703void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1704int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1705int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1706int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1707int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1708__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1709__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1710int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1711
1712#ifdef CONFIG_XFRM
1713void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1714int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1715int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1716struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1717					struct sk_buff *skb);
1718struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1719					struct sk_buff *skb);
1720int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1721		     int optlen);
1722#else
1723static inline int xfrm_user_policy(struct sock *sk, int optname,
1724				   sockptr_t optval, int optlen)
1725{
1726 	return -ENOPROTOOPT;
 
 
 
 
 
 
 
1727}
1728#endif
1729
1730struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1731				    const xfrm_address_t *saddr,
1732				    const xfrm_address_t *daddr,
1733				    int family, u32 mark);
1734
1735struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1736
1737void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1738int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1739		     int (*func)(struct xfrm_policy *, int, int, void*),
1740		     void *);
1741void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1742int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1743struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1744					  const struct xfrm_mark *mark,
1745					  u32 if_id, u8 type, int dir,
1746					  struct xfrm_selector *sel,
1747					  struct xfrm_sec_ctx *ctx, int delete,
1748					  int *err);
1749struct xfrm_policy *xfrm_policy_byid(struct net *net,
1750				     const struct xfrm_mark *mark, u32 if_id,
1751				     u8 type, int dir, u32 id, int delete,
1752				     int *err);
1753int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1754void xfrm_policy_hash_rebuild(struct net *net);
1755u32 xfrm_get_acqseq(void);
1756int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1757int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1758		   struct netlink_ext_ack *extack);
1759struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1760				 u8 mode, u32 reqid, u32 if_id, u8 proto,
1761				 const xfrm_address_t *daddr,
1762				 const xfrm_address_t *saddr, int create,
1763				 unsigned short family);
1764int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1765
1766#ifdef CONFIG_XFRM_MIGRATE
1767int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1768	       const struct xfrm_migrate *m, int num_bundles,
1769	       const struct xfrm_kmaddress *k,
1770	       const struct xfrm_encap_tmpl *encap);
1771struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1772						u32 if_id);
1773struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1774				      struct xfrm_migrate *m,
1775				      struct xfrm_encap_tmpl *encap);
1776int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1777		 struct xfrm_migrate *m, int num_bundles,
1778		 struct xfrm_kmaddress *k, struct net *net,
1779		 struct xfrm_encap_tmpl *encap, u32 if_id,
1780		 struct netlink_ext_ack *extack);
1781#endif
1782
1783int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1784void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1785int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1786	      xfrm_address_t *addr);
1787
1788void xfrm_input_init(void);
1789int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1790
1791void xfrm_probe_algs(void);
1792int xfrm_count_pfkey_auth_supported(void);
1793int xfrm_count_pfkey_enc_supported(void);
1794struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1795struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1796struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1797struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1798struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1799struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1800struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1801struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1802struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1803					    int probe);
1804
1805static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1806				    const xfrm_address_t *b)
1807{
1808	return ipv6_addr_equal((const struct in6_addr *)a,
1809			       (const struct in6_addr *)b);
1810}
1811
1812static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1813				   const xfrm_address_t *b,
1814				   sa_family_t family)
1815{
1816	switch (family) {
1817	default:
1818	case AF_INET:
1819		return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1820	case AF_INET6:
1821		return xfrm6_addr_equal(a, b);
 
1822	}
1823}
1824
1825static inline int xfrm_policy_id2dir(u32 index)
1826{
1827	return index & 7;
1828}
1829
1830#ifdef CONFIG_XFRM
1831void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1832int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1833void xfrm_replay_notify(struct xfrm_state *x, int event);
1834int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1835int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1836
1837static inline int xfrm_aevent_is_on(struct net *net)
1838{
1839	struct sock *nlsk;
1840	int ret = 0;
1841
1842	rcu_read_lock();
1843	nlsk = rcu_dereference(net->xfrm.nlsk);
1844	if (nlsk)
1845		ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1846	rcu_read_unlock();
1847	return ret;
1848}
1849
1850static inline int xfrm_acquire_is_on(struct net *net)
1851{
1852	struct sock *nlsk;
1853	int ret = 0;
1854
1855	rcu_read_lock();
1856	nlsk = rcu_dereference(net->xfrm.nlsk);
1857	if (nlsk)
1858		ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1859	rcu_read_unlock();
1860
1861	return ret;
1862}
1863#endif
1864
1865static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1866{
1867	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1868}
1869
1870static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1871{
1872	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1873}
1874
1875static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1876{
1877	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1878}
1879
1880static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1881{
1882	return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1883}
1884
1885#ifdef CONFIG_XFRM_MIGRATE
1886static inline int xfrm_replay_clone(struct xfrm_state *x,
1887				     struct xfrm_state *orig)
1888{
1889
1890	x->replay_esn = kmemdup(orig->replay_esn,
1891				xfrm_replay_state_esn_len(orig->replay_esn),
1892				GFP_KERNEL);
1893	if (!x->replay_esn)
1894		return -ENOMEM;
1895	x->preplay_esn = kmemdup(orig->preplay_esn,
1896				 xfrm_replay_state_esn_len(orig->preplay_esn),
 
 
 
 
1897				 GFP_KERNEL);
1898	if (!x->preplay_esn)
 
1899		return -ENOMEM;
 
1900
1901	return 0;
1902}
1903
1904static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1905{
1906	return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1907}
1908
1909
1910static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1911{
1912	return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1913}
1914
1915static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1916{
1917	return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1918}
1919
1920static inline void xfrm_states_put(struct xfrm_state **states, int n)
1921{
1922	int i;
1923	for (i = 0; i < n; i++)
1924		xfrm_state_put(*(states + i));
1925}
1926
1927static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1928{
1929	int i;
1930	for (i = 0; i < n; i++)
1931		xfrm_state_delete(*(states + i));
1932}
1933#endif
1934
1935void __init xfrm_dev_init(void);
1936
1937#ifdef CONFIG_XFRM_OFFLOAD
1938void xfrm_dev_resume(struct sk_buff *skb);
1939void xfrm_dev_backlog(struct softnet_data *sd);
1940struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1941int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1942		       struct xfrm_user_offload *xuo,
1943		       struct netlink_ext_ack *extack);
1944int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1945			struct xfrm_user_offload *xuo, u8 dir,
1946			struct netlink_ext_ack *extack);
1947bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1948
1949static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1950{
1951	struct xfrm_dev_offload *xso = &x->xso;
1952
1953	if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1954		xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1955}
1956
1957static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1958{
1959	struct xfrm_state *x = dst->xfrm;
1960	struct xfrm_dst *xdst;
1961
1962	if (!x || !x->type_offload)
1963		return false;
1964
1965	xdst = (struct xfrm_dst *) dst;
1966	if (!x->xso.offload_handle && !xdst->child->xfrm)
1967		return true;
1968	if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1969	    !xdst->child->xfrm)
1970		return true;
1971
1972	return false;
1973}
1974
1975static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1976{
1977	struct xfrm_dev_offload *xso = &x->xso;
1978
1979	if (xso->dev)
1980		xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1981}
1982
1983static inline void xfrm_dev_state_free(struct xfrm_state *x)
1984{
1985	struct xfrm_dev_offload *xso = &x->xso;
1986	struct net_device *dev = xso->dev;
1987
1988	if (dev && dev->xfrmdev_ops) {
1989		if (dev->xfrmdev_ops->xdo_dev_state_free)
1990			dev->xfrmdev_ops->xdo_dev_state_free(x);
1991		xso->dev = NULL;
1992		xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1993		netdev_put(dev, &xso->dev_tracker);
1994	}
1995}
1996
1997static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1998{
1999	struct xfrm_dev_offload *xdo = &x->xdo;
2000	struct net_device *dev = xdo->dev;
2001
2002	if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
2003		dev->xfrmdev_ops->xdo_dev_policy_delete(x);
2004}
2005
2006static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2007{
2008	struct xfrm_dev_offload *xdo = &x->xdo;
2009	struct net_device *dev = xdo->dev;
2010
2011	if (dev && dev->xfrmdev_ops) {
2012		if (dev->xfrmdev_ops->xdo_dev_policy_free)
2013			dev->xfrmdev_ops->xdo_dev_policy_free(x);
2014		xdo->dev = NULL;
2015		netdev_put(dev, &xdo->dev_tracker);
2016	}
2017}
2018#else
2019static inline void xfrm_dev_resume(struct sk_buff *skb)
2020{
2021}
2022
2023static inline void xfrm_dev_backlog(struct softnet_data *sd)
2024{
2025}
2026
2027static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2028{
2029	return skb;
2030}
2031
2032static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2033{
2034	return 0;
2035}
2036
2037static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2038{
2039}
2040
2041static inline void xfrm_dev_state_free(struct xfrm_state *x)
2042{
2043}
2044
2045static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2046				      struct xfrm_user_offload *xuo, u8 dir,
2047				      struct netlink_ext_ack *extack)
2048{
2049	return 0;
2050}
2051
2052static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2053{
2054}
2055
2056static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2057{
2058}
2059
2060static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2061{
2062	return false;
2063}
2064
2065static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2066{
2067}
2068
2069static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2070{
2071	return false;
2072}
2073#endif
2074
2075static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2076{
2077	if (attrs[XFRMA_MARK])
2078		memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2079	else
2080		m->v = m->m = 0;
2081
2082	return m->v & m->m;
2083}
2084
2085static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2086{
2087	int ret = 0;
2088
2089	if (m->m | m->v)
2090		ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2091	return ret;
2092}
2093
2094static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2095{
2096	struct xfrm_mark *m = &x->props.smark;
2097
2098	return (m->v & m->m) | (mark & ~m->m);
2099}
2100
2101static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2102{
2103	int ret = 0;
2104
2105	if (if_id)
2106		ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2107	return ret;
2108}
2109
2110static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2111				    unsigned int family)
2112{
2113	bool tunnel = false;
2114
2115	switch(family) {
2116	case AF_INET:
2117		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2118			tunnel = true;
2119		break;
2120	case AF_INET6:
2121		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2122			tunnel = true;
2123		break;
2124	}
2125	if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2126		return -EINVAL;
2127
2128	return 0;
2129}
2130
2131extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2132extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2133
2134struct xfrm_translator {
2135	/* Allocate frag_list and put compat translation there */
2136	int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2137
2138	/* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2139	struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2140			int maxtype, const struct nla_policy *policy,
2141			struct netlink_ext_ack *extack);
2142
2143	/* Translate 32-bit user_policy from sockptr */
2144	int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2145
2146	struct module *owner;
2147};
2148
2149#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2150extern int xfrm_register_translator(struct xfrm_translator *xtr);
2151extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2152extern struct xfrm_translator *xfrm_get_translator(void);
2153extern void xfrm_put_translator(struct xfrm_translator *xtr);
2154#else
2155static inline struct xfrm_translator *xfrm_get_translator(void)
2156{
2157	return NULL;
2158}
2159static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2160{
2161}
2162#endif
2163
2164#if IS_ENABLED(CONFIG_IPV6)
2165static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2166{
2167	int proto;
2168
2169	if (!sk || sk->sk_family != AF_INET6)
2170		return false;
2171
2172	proto = sk->sk_protocol;
2173	if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2174		return inet6_test_bit(DONTFRAG, sk);
2175
2176	return false;
2177}
2178#endif
2179
2180#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2181    (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2182
2183extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2184
2185int register_xfrm_interface_bpf(void);
2186
2187#else
2188
2189static inline int register_xfrm_interface_bpf(void)
2190{
2191	return 0;
2192}
2193
2194#endif
2195
2196#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF)
2197int register_xfrm_state_bpf(void);
2198#else
2199static inline int register_xfrm_state_bpf(void)
2200{
2201	return 0;
2202}
2203#endif
2204
2205#endif	/* _NET_XFRM_H */