/* SPDX-License-Identifier: GPL-2.0-or-later *//* *	Linux INET6 implementation  * *	Authors: *	Pedro Roque		<roque@di.fc.ul.pt>	 */ #ifndef _IP6_FIB_H#define _IP6_FIB_H #include <linux/ipv6_route.h>#include <linux/rtnetlink.h>#include <linux/spinlock.h>#include <linux/notifier.h>#include <net/dst.h>#include <net/flow.h>#include <net/ip_fib.h>#include <net/netlink.h>#include <net/inetpeer.h>#include <net/fib_notifier.h>#include <linux/indirect_call_wrapper.h>#include <uapi/linux/bpf.h> #ifdef CONFIG_IPV6_MULTIPLE_TABLES#define FIB6_TABLE_HASHSZ 256#else#define FIB6_TABLE_HASHSZ 1#endif #define RT6_DEBUG 2 struct rt6_info;struct fib6_info; struct fib6_config {	u32		fc_table;	u32		fc_metric;	int		fc_dst_len;	int		fc_src_len;	int		fc_ifindex;	u32		fc_flags;	u32		fc_protocol;	u16		fc_type;        /* only 8 bits are used */	u16		fc_delete_all_nh : 1,			fc_ignore_dev_down:1,			__unused : 14;	u32		fc_nh_id; 	struct in6_addr	fc_dst;	struct in6_addr	fc_src;	struct in6_addr	fc_prefsrc;	struct in6_addr	fc_gateway; 	unsigned long	fc_expires;	struct nlattr	*fc_mx;	int		fc_mx_len;	int		fc_mp_len;	struct nlattr	*fc_mp; 	struct nl_info	fc_nlinfo;	struct nlattr	*fc_encap;	u16		fc_encap_type;	bool		fc_is_fdb;}; struct fib6_node {	struct fib6_node __rcu	*parent;	struct fib6_node __rcu	*left;	struct fib6_node __rcu	*right;#ifdef CONFIG_IPV6_SUBTREES	struct fib6_node __rcu	*subtree;#endif	struct fib6_info __rcu	*leaf; 	__u16			fn_bit;		/* bit key */	__u16			fn_flags;	int			fn_sernum;	struct fib6_info __rcu	*rr_ptr;	struct rcu_head		rcu;}; struct fib6_gc_args {	int			timeout;	int			more;}; #ifndef CONFIG_IPV6_SUBTREES#define FIB6_SUBTREE(fn)	NULL static inline bool fib6_routes_require_src(const struct net *net){	return false;} static inline void fib6_routes_require_src_inc(struct net *net) {}static inline void fib6_routes_require_src_dec(struct net *net) {} #else static inline bool fib6_routes_require_src(const struct net *net){	return net->ipv6.fib6_routes_require_src > 0;} static inline void fib6_routes_require_src_inc(struct net *net){	net->ipv6.fib6_routes_require_src++;} static inline void fib6_routes_require_src_dec(struct net *net){	net->ipv6.fib6_routes_require_src--;} #define FIB6_SUBTREE(fn)	(rcu_dereference_protected((fn)->subtree, 1))#endif /* *	routing information * */ struct rt6key {	struct in6_addr	addr;	int		plen;}; struct fib6_table; struct rt6_exception_bucket {	struct hlist_head	chain;	int			depth;}; struct rt6_exception {	struct hlist_node	hlist;	struct rt6_info		*rt6i;	unsigned long		stamp;	struct rcu_head		rcu;}; #define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10#define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)#define FIB6_MAX_DEPTH 5 struct fib6_nh {	struct fib_nh_common	nh_common; #ifdef CONFIG_IPV6_ROUTER_PREF	unsigned long		last_probe;#endif 	struct rt6_info * __percpu *rt6i_pcpu;	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;}; struct fib6_info {	struct fib6_table		*fib6_table;	struct fib6_info __rcu		*fib6_next;	struct fib6_node __rcu		*fib6_node; 	/* Multipath routes:	 * siblings is a list of fib6_info that have the same metric/weight,	 * destination, but not the same gateway. nsiblings is just a cache	 * to speed up lookup.	 */	union {		struct list_head	fib6_siblings;		struct list_head	nh_list;	};	unsigned int			fib6_nsiblings; 	refcount_t			fib6_ref;	unsigned long			expires; 	struct hlist_node		gc_link; 	struct dst_metrics		*fib6_metrics;#define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1] 	struct rt6key			fib6_dst;	u32				fib6_flags;	struct rt6key			fib6_src;	struct rt6key			fib6_prefsrc; 	u32				fib6_metric;	u8				fib6_protocol;	u8				fib6_type; 	u8				offload;	u8				trap;	u8				offload_failed; 	u8				should_flush:1,					dst_nocount:1,					dst_nopolicy:1,					fib6_destroying:1,					unused:4; 	struct list_head		purge_link;	struct rcu_head			rcu;	struct nexthop			*nh;	struct fib6_nh			fib6_nh[];}; struct rt6_info {	struct dst_entry		dst;	struct fib6_info __rcu		*from;	int				sernum; 	struct rt6key			rt6i_dst;	struct rt6key			rt6i_src;	struct in6_addr			rt6i_gateway;	struct inet6_dev		*rt6i_idev;	u32				rt6i_flags; 	/* more non-fragment space at head required */	unsigned short			rt6i_nfheader_len;}; struct fib6_result {	struct fib6_nh		*nh;	struct fib6_info	*f6i;	u32			fib6_flags;	u8			fib6_type;	struct rt6_info		*rt6;}; #define for_each_fib6_node_rt_rcu(fn)					\	for (rt = rcu_dereference((fn)->leaf); rt;			\	     rt = rcu_dereference(rt->fib6_next)) #define for_each_fib6_walker_rt(w)					\	for (rt = (w)->leaf; rt;					\	     rt = rcu_dereference_protected(rt->fib6_next, 1)) #define dst_rt6_info(_ptr) container_of_const(_ptr, struct rt6_info, dst) static inline struct inet6_dev *ip6_dst_idev(const struct dst_entry *dst){	return dst_rt6_info(dst)->rt6i_idev;} static inline bool fib6_requires_src(const struct fib6_info *rt){	return rt->fib6_src.plen > 0;} /* The callers should hold f6i->fib6_table->tb6_lock if a route has ever * been added to a table before. */static inline void fib6_clean_expires(struct fib6_info *f6i){	f6i->fib6_flags &= ~RTF_EXPIRES;	f6i->expires = 0;} /* The callers should hold f6i->fib6_table->tb6_lock if a route has ever * been added to a table before. */static inline void fib6_set_expires(struct fib6_info *f6i,				    unsigned long expires){	f6i->expires = expires;	f6i->fib6_flags |= RTF_EXPIRES;} static inline bool fib6_check_expired(const struct fib6_info *f6i){	if (f6i->fib6_flags & RTF_EXPIRES)		return time_after(jiffies, f6i->expires);	return false;} /* Function to safely get fn->fn_sernum for passed in rt * and store result in passed in cookie. * Return true if we can get cookie safely * Return false if not */static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,					u32 *cookie){	struct fib6_node *fn;	bool status = false; 	fn = rcu_dereference(f6i->fib6_node); 	if (fn) {		*cookie = READ_ONCE(fn->fn_sernum);		/* pairs with smp_wmb() in __fib6_update_sernum_upto_root() */		smp_rmb();		status = true;	} 	return status;} static inline u32 rt6_get_cookie(const struct rt6_info *rt){	struct fib6_info *from;	u32 cookie = 0; 	if (rt->sernum)		return rt->sernum; 	rcu_read_lock(); 	from = rcu_dereference(rt->from);	if (from)		fib6_get_cookie_safe(from, &cookie); 	rcu_read_unlock(); 	return cookie;} static inline void ip6_rt_put(struct rt6_info *rt){	/* dst_release() accepts a NULL parameter.	 * We rely on dst being first structure in struct rt6_info	 */	BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);	dst_release(&rt->dst);} struct fib6_info *fib6_info_alloc(gfp_t gfp_flags, bool with_fib6_nh);void fib6_info_destroy_rcu(struct rcu_head *head); static inline void fib6_info_hold(struct fib6_info *f6i){	refcount_inc(&f6i->fib6_ref);} static inline bool fib6_info_hold_safe(struct fib6_info *f6i){	return refcount_inc_not_zero(&f6i->fib6_ref);} static inline void fib6_info_release(struct fib6_info *f6i){	if (f6i && refcount_dec_and_test(&f6i->fib6_ref)) {		DEBUG_NET_WARN_ON_ONCE(!hlist_unhashed(&f6i->gc_link));		call_rcu_hurry(&f6i->rcu, fib6_info_destroy_rcu);	}} enum fib6_walk_state {#ifdef CONFIG_IPV6_SUBTREES	FWS_S,#endif	FWS_L,	FWS_R,	FWS_C,	FWS_U}; struct fib6_walker {	struct list_head lh;	struct fib6_node *root, *node;	struct fib6_info *leaf;	enum fib6_walk_state state;	unsigned int skip;	unsigned int count;	unsigned int skip_in_node;	int (*func)(struct fib6_walker *);	void *args;}; struct rt6_statistics {	__u32		fib_nodes;		/* all fib6 nodes */	__u32		fib_route_nodes;	/* intermediate nodes */	__u32		fib_rt_entries;		/* rt entries in fib table */	__u32		fib_rt_cache;		/* cached rt entries in exception table */	__u32		fib_discarded_routes;	/* total number of routes delete */ 	/* The following stat is not protected by any lock */	atomic_t	fib_rt_alloc;		/* total number of routes alloced */}; #define RTN_TL_ROOT	0x0001#define RTN_ROOT	0x0002		/* tree root node		*/#define RTN_RTINFO	0x0004		/* node with valid routing info	*/ /* *	priority levels (or metrics) * */  struct fib6_table {	struct hlist_node	tb6_hlist;	u32			tb6_id;	spinlock_t		tb6_lock;	struct fib6_node	tb6_root;	struct inet_peer_base	tb6_peers;	unsigned int		flags;	unsigned int		fib_seq; /* writes protected by rtnl_mutex */	struct hlist_head       tb6_gc_hlist;	/* GC candidates */#define RT6_TABLE_HAS_DFLT_ROUTER	BIT(0)}; #define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC#define RT6_TABLE_MAIN		RT_TABLE_MAIN#define RT6_TABLE_DFLT		RT6_TABLE_MAIN#define RT6_TABLE_INFO		RT6_TABLE_MAIN#define RT6_TABLE_PREFIX	RT6_TABLE_MAIN #ifdef CONFIG_IPV6_MULTIPLE_TABLES#define FIB6_TABLE_MIN		1#define FIB6_TABLE_MAX		RT_TABLE_MAX#define RT6_TABLE_LOCAL		RT_TABLE_LOCAL#else#define FIB6_TABLE_MIN		RT_TABLE_MAIN#define FIB6_TABLE_MAX		FIB6_TABLE_MIN#define RT6_TABLE_LOCAL		RT6_TABLE_MAIN#endif typedef struct rt6_info *(*pol_lookup_t)(struct net *,					 struct fib6_table *,					 struct flowi6 *,					 const struct sk_buff *, int); struct fib6_entry_notifier_info {	struct fib_notifier_info info; /* must be first */	struct fib6_info *rt;	unsigned int nsiblings;}; /* *	exported functions */ struct fib6_table *fib6_get_table(struct net *net, u32 id);struct fib6_table *fib6_new_table(struct net *net, u32 id);struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,				   const struct sk_buff *skb,				   int flags, pol_lookup_t lookup); /* called with rcu lock held; can return error pointer * caller needs to select path */int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,		struct fib6_result *res, int flags); /* called with rcu lock held; caller needs to select path */int fib6_table_lookup(struct net *net, struct fib6_table *table,		      int oif, struct flowi6 *fl6, struct fib6_result *res,		      int strict); void fib6_select_path(const struct net *net, struct fib6_result *res,		      struct flowi6 *fl6, int oif, bool have_oif_match,		      const struct sk_buff *skb, int strict);struct fib6_node *fib6_node_lookup(struct fib6_node *root,				   const struct in6_addr *daddr,				   const struct in6_addr *saddr); struct fib6_node *fib6_locate(struct fib6_node *root,			      const struct in6_addr *daddr, int dst_len,			      const struct in6_addr *saddr, int src_len,			      bool exact_match); void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),		    void *arg);void fib6_clean_all_skip_notify(struct net *net,				int (*func)(struct fib6_info *, void *arg),				void *arg); int fib6_add(struct fib6_node *root, struct fib6_info *rt,	     struct nl_info *info, struct netlink_ext_ack *extack);int fib6_del(struct fib6_info *rt, struct nl_info *info,	     enum rt_del_reason del_reason); static inlinevoid rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr){	const struct fib6_info *from; 	rcu_read_lock(); 	from = rcu_dereference(rt->from);	if (from)		*addr = from->fib6_prefsrc.addr;	else		*addr = in6addr_any; 	rcu_read_unlock();} #if IS_ENABLED(CONFIG_IPV6)int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,		 struct fib6_config *cfg, gfp_t gfp_flags,		 struct netlink_ext_ack *extack);void fib6_nh_release(struct fib6_nh *fib6_nh);void fib6_nh_release_dsts(struct fib6_nh *fib6_nh);#elsestatic inline int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,			       struct fib6_config *cfg, gfp_t gfp_flags,			       struct netlink_ext_ack *extack){

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