[thirdparty/kernel/stable.git] / include / net / ip6_fib.h

/* 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>

#ifdef CONFIG_IPV6_MULTIPLE_TABLES
#define FIB6_TABLE_HASHSZ 256
#else
#define FIB6_TABLE_HASHSZ 1
#endif

#define RT6_DEBUG 2

#if RT6_DEBUG >= 3
#define RT6_TRACE(x...) pr_debug(x)
#else
#define RT6_TRACE(x...) do { ; } while (0)
#endif

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;

	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;
};

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
#else
#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 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 the same metric/weight,
	 * destination, but not the same gateway. nsiblings is just a cache
	 * to speed up lookup.
	 */
	struct list_head		fib6_siblings;
	unsigned int			fib6_nsiblings;

	refcount_t			fib6_ref;
	unsigned long			expires;
	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;

	struct rt6_info * __percpu	*rt6i_pcpu;
	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;

	u32				fib6_metric;
	u8				fib6_protocol;
	u8				fib6_type;
	u8				exception_bucket_flushed:1,
					should_flush:1,
					dst_nocount:1,
					dst_nopolicy:1,
					dst_host:1,
					fib6_destroying:1,
					unused:2;

	struct fib6_nh			fib6_nh;
	struct rcu_head			rcu;
};

struct rt6_info {
	struct dst_entry		dst;
	struct fib6_info __rcu		*from;

	struct rt6key			rt6i_dst;
	struct rt6key			rt6i_src;
	struct in6_addr			rt6i_gateway;
	struct inet6_dev		*rt6i_idev;
	u32				rt6i_flags;

	struct list_head		rt6i_uncached;
	struct uncached_list		*rt6i_uncached_list;

	/* 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))

static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
{
	return ((struct rt6_info *)dst)->rt6i_idev;
}

static inline void fib6_clean_expires(struct fib6_info *f6i)
{
	f6i->fib6_flags &= ~RTF_EXPIRES;
	f6i->expires = 0;
}

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->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 = 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;

	rcu_read_lock();

	from = rcu_dereference(rt->from);
	if (from && (rt->rt6i_flags & RTF_PCPU ||
	    unlikely(!list_empty(&rt->rt6i_uncached))))
		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);
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))
		call_rcu(&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;
	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 stats are not protected by any lock */
	atomic_t	fib_rt_alloc;		/* total number of routes alloced */
	atomic_t	fib_rt_uncache;		/* rt entries in uncached list */
};

#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;
#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;
};

/*
 *	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);

static inline
void 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 {
		struct in6_addr in6_zero = {};

		*addr = in6_zero;
	}

	rcu_read_unlock();
}

static inline struct net_device *fib6_info_nh_dev(const struct fib6_info *f6i)
{
	return f6i->fib6_nh.fib_nh_dev;
}

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 inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
		     unsigned int flags);

void fib6_run_gc(unsigned long expires, struct net *net, bool force);

void fib6_gc_cleanup(void);

int fib6_init(void);

struct ipv6_route_iter {
	struct seq_net_private p;
	struct fib6_walker w;
	loff_t skip;
	struct fib6_table *tbl;
	int sernum;
};

extern const struct seq_operations ipv6_route_seq_ops;

int call_fib6_notifier(struct notifier_block *nb, struct net *net,
		       enum fib_event_type event_type,
		       struct fib_notifier_info *info);
int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
			struct fib_notifier_info *info);

int __net_init fib6_notifier_init(struct net *net);
void __net_exit fib6_notifier_exit(struct net *net);

unsigned int fib6_tables_seq_read(struct net *net);
int fib6_tables_dump(struct net *net, struct notifier_block *nb);

void fib6_update_sernum(struct net *net, struct fib6_info *rt);
void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);

void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
{
	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
}

#ifdef CONFIG_IPV6_MULTIPLE_TABLES
int fib6_rules_init(void);
void fib6_rules_cleanup(void);
bool fib6_rule_default(const struct fib_rule *rule);
int fib6_rules_dump(struct net *net, struct notifier_block *nb);
unsigned int fib6_rules_seq_read(struct net *net);

static inline bool fib6_rules_early_flow_dissect(struct net *net,
						 struct sk_buff *skb,
						 struct flowi6 *fl6,
						 struct flow_keys *flkeys)
{
	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;

	if (!net->ipv6.fib6_rules_require_fldissect)
		return false;

	skb_flow_dissect_flow_keys(skb, flkeys, flag);
	fl6->fl6_sport = flkeys->ports.src;
	fl6->fl6_dport = flkeys->ports.dst;
	fl6->flowi6_proto = flkeys->basic.ip_proto;

	return true;
}
#else
static inline int               fib6_rules_init(void)
{
	return 0;
}
static inline void              fib6_rules_cleanup(void)
{
	return ;
}
static inline bool fib6_rule_default(const struct fib_rule *rule)
{
	return true;
}
static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb)
{
	return 0;
}
static inline unsigned int fib6_rules_seq_read(struct net *net)
{
	return 0;
}
static inline bool fib6_rules_early_flow_dissect(struct net *net,
						 struct sk_buff *skb,
						 struct flowi6 *fl6,
						 struct flow_keys *flkeys)
{
	return false;
}
#endif
#endif
Commit	Line	Data
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4 LT	2	/*
	3	* Linux INET6 implementation
	4	*
	5	* Authors:
	6	* Pedro Roque <roque@di.fc.ul.pt>
1da177e4 LT	7	*/
	8
	9	#ifndef _IP6_FIB_H
	10	#define _IP6_FIB_H
	11
1da177e4	12	#include <linux/ipv6_route.h>
1da177e4 LT	13	#include <linux/rtnetlink.h>
1da177e4 LT	14	#include <linux/spinlock.h>
16ab6d7d	15	#include <linux/notifier.h>
86872cb5 TG	16	#include <net/dst.h>
86872cb5 TG	17	#include <net/flow.h>
f1741730	18	#include <net/ip_fib.h>
86872cb5	19	#include <net/netlink.h>
b3419363	20	#include <net/inetpeer.h>
16ab6d7d	21	#include <net/fib_notifier.h>
1da177e4	22
a33bc5c1 NH	23	#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	24	#define FIB6_TABLE_HASHSZ 256
	25	#else
	26	#define FIB6_TABLE_HASHSZ 1
	27	#endif
	28
c757faa8 WW	29	#define RT6_DEBUG 2
	30
	31	#if RT6_DEBUG >= 3
	32	#define RT6_TRACE(x...) pr_debug(x)
	33	#else
	34	#define RT6_TRACE(x...) do { ; } while (0)
	35	#endif
	36
1da177e4	37	struct rt6_info;
a64efe14	38	struct fib6_info;
1da177e4	39
fd2c3ef7	40	struct fib6_config {
86872cb5 TG	41	u32 fc_table;
	42	u32 fc_metric;
	43	int fc_dst_len;
	44	int fc_src_len;
	45	int fc_ifindex;
	46	u32 fc_flags;
	47	u32 fc_protocol;
0ae81335 DA	48	u16 fc_type; /* only 8 bits are used */
0ae81335 DA	49	u16 fc_delete_all_nh : 1,
c7a1ce39 DA	50	fc_ignore_dev_down:1,
c7a1ce39 DA	51	__unused : 14;
86872cb5 TG	52
	53	struct in6_addr fc_dst;
	54	struct in6_addr fc_src;
c3968a85	55	struct in6_addr fc_prefsrc;
86872cb5 TG	56	struct in6_addr fc_gateway;
	57
	58	unsigned long fc_expires;
	59	struct nlattr *fc_mx;
	60	int fc_mx_len;
51ebd318 ND	61	int fc_mp_len;
51ebd318 ND	62	struct nlattr *fc_mp;
86872cb5 TG	63
86872cb5 TG	64	struct nl_info fc_nlinfo;
19e42e45 RP	65	struct nlattr *fc_encap;
19e42e45 RP	66	u16 fc_encap_type;
86872cb5 TG	67	};
86872cb5 TG	68
fd2c3ef7	69	struct fib6_node {
66f5d6ce WW	70	struct fib6_node __rcu *parent;
	71	struct fib6_node __rcu *left;
	72	struct fib6_node __rcu *right;
8bce65b9	73	#ifdef CONFIG_IPV6_SUBTREES
66f5d6ce	74	struct fib6_node __rcu *subtree;
8bce65b9	75	#endif
8d1c802b	76	struct fib6_info __rcu *leaf;
1da177e4 LT	77
	78	__u16 fn_bit; /* bit key */
	79	__u16 fn_flags;
42b18706	80	int fn_sernum;
8d1c802b	81	struct fib6_info __rcu *rr_ptr;
c5cff856	82	struct rcu_head rcu;
1da177e4 LT	83	};
1da177e4 LT	84
c757faa8 WW	85	struct fib6_gc_args {
	86	int timeout;
	87	int more;
	88	};
	89
7fc33165 YH	90	#ifndef CONFIG_IPV6_SUBTREES
	91	#define FIB6_SUBTREE(fn) NULL
	92	#else
66f5d6ce	93	#define FIB6_SUBTREE(fn) (rcu_dereference_protected((fn)->subtree, 1))
7fc33165	94	#endif
1da177e4 LT	95
	96	/*
	97	* routing information
	98	*
	99	*/
	100
fd2c3ef7	101	struct rt6key {
1da177e4 LT	102	struct in6_addr addr;
	103	int plen;
	104	};
	105
c71099ac TG	106	struct fib6_table;
c71099ac TG	107
35732d01 WW	108	struct rt6_exception_bucket {
	109	struct hlist_head chain;
	110	int depth;
	111	};
	112
	113	struct rt6_exception {
	114	struct hlist_node hlist;
	115	struct rt6_info *rt6i;
	116	unsigned long stamp;
	117	struct rcu_head rcu;
	118	};
	119
	120	#define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
	121	#define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
	122	#define FIB6_MAX_DEPTH 5
	123
5e670d84	124	struct fib6_nh {
f1741730	125	struct fib_nh_common nh_common;
cc3a86c8 DA	126
	127	#ifdef CONFIG_IPV6_ROUTER_PREF
	128	unsigned long last_probe;
	129	#endif
5e670d84	130	};
1da177e4	131
a64efe14	132	struct fib6_info {
93c2fb25	133	struct fib6_table *fib6_table;
8fb11a9a	134	struct fib6_info __rcu *fib6_next;
93c2fb25	135	struct fib6_node __rcu *fib6_node;
1da177e4	136
51ebd318	137	/* Multipath routes:
a64efe14	138	* siblings is a list of fib6_info that have the the same metric/weight,
51ebd318 ND	139	* destination, but not the same gateway. nsiblings is just a cache
	140	* to speed up lookup.
	141	*/
93c2fb25 DA	142	struct list_head fib6_siblings;
93c2fb25 DA	143	unsigned int fib6_nsiblings;
51ebd318	144
f05713e0	145	refcount_t fib6_ref;
a64efe14 DA	146	unsigned long expires;
	147	struct dst_metrics *fib6_metrics;
	148	#define fib6_pmtu fib6_metrics->metrics[RTAX_MTU-1]
a47ed4cd	149
93c2fb25 DA	150	struct rt6key fib6_dst;
	151	u32 fib6_flags;
	152	struct rt6key fib6_src;
	153	struct rt6key fib6_prefsrc;
fe400799	154
a64efe14 DA	155	struct rt6_info * __percpu *rt6i_pcpu;
	156	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
	157
93c2fb25 DA	158	u32 fib6_metric;
93c2fb25 DA	159	u8 fib6_protocol;
a64efe14 DA	160	u8 fib6_type;
	161	u8 exception_bucket_flushed:1,
	162	should_flush:1,
	163	dst_nocount:1,
	164	dst_nopolicy:1,
	165	dst_host:1,
61fb0d01 ED	166	fib6_destroying:1,
61fb0d01 ED	167	unused:2;
a64efe14 DA	168
a64efe14 DA	169	struct fib6_nh fib6_nh;
9b0a8da8	170	struct rcu_head rcu;
a64efe14 DA	171	};
a64efe14 DA	172
fd2c3ef7	173	struct rt6_info {
d8d1f30b	174	struct dst_entry dst;
a68886a6	175	struct fib6_info __rcu *from;
1da177e4	176
77634cc6	177	struct rt6key rt6i_dst;
bd2c77a0	178	struct rt6key rt6i_src;
1da177e4	179	struct in6_addr rt6i_gateway;
77634cc6	180	struct inet6_dev *rt6i_idev;
bd2c77a0	181	u32 rt6i_flags;
b4ce9277	182
8d0b94af MKL	183	struct list_head rt6i_uncached;
	184	struct uncached_list *rt6i_uncached_list;
	185
bd2c77a0 YH	186	/* more non-fragment space at head required */
bd2c77a0 YH	187	unsigned short rt6i_nfheader_len;
1da177e4 LT	188	};
1da177e4 LT	189
b1d40991 DA	190	struct fib6_result {
	191	struct fib6_nh *nh;
	192	struct fib6_info *f6i;
7d21fec9 DA	193	u32 fib6_flags;
7d21fec9 DA	194	u8 fib6_type;
a65120ba	195	struct rt6_info *rt6;
b1d40991 DA	196	};
b1d40991 DA	197
66f5d6ce WW	198	#define for_each_fib6_node_rt_rcu(fn) \
66f5d6ce WW	199	for (rt = rcu_dereference((fn)->leaf); rt; \
8fb11a9a	200	rt = rcu_dereference(rt->fib6_next))
66f5d6ce WW	201
	202	#define for_each_fib6_walker_rt(w) \
	203	for (rt = (w)->leaf; rt; \
8fb11a9a	204	rt = rcu_dereference_protected(rt->fib6_next, 1))
66f5d6ce	205
7a3025b1 YH	206	static inline struct inet6_dev ip6_dst_idev(struct dst_entry dst)
	207	{
	208	return ((struct rt6_info *)dst)->rt6i_idev;
	209	}
	210
8d1c802b	211	static inline void fib6_clean_expires(struct fib6_info *f6i)
1716a961	212	{
93c2fb25	213	f6i->fib6_flags &= ~RTF_EXPIRES;
14895687	214	f6i->expires = 0;
1716a961 G	215	}
1716a961 G	216
8d1c802b	217	static inline void fib6_set_expires(struct fib6_info *f6i,
14895687	218	unsigned long expires)
1716a961	219	{
14895687	220	f6i->expires = expires;
93c2fb25	221	f6i->fib6_flags \|= RTF_EXPIRES;
1716a961 G	222	}
1716a961 G	223
8d1c802b	224	static inline bool fib6_check_expired(const struct fib6_info *f6i)
1716a961	225	{
93c2fb25	226	if (f6i->fib6_flags & RTF_EXPIRES)
14895687 DA	227	return time_after(jiffies, f6i->expires);
14895687 DA	228	return false;
1716a961	229	}
b197df4f	230
c5cff856 WW	231	/* Function to safely get fn->sernum for passed in rt
	232	* and store result in passed in cookie.
	233	* Return true if we can get cookie safely
	234	* Return false if not
	235	*/
a269f1a7 DA	236	static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
a269f1a7 DA	237	u32 *cookie)
c5cff856 WW	238	{
	239	struct fib6_node *fn;
	240	bool status = false;
	241
93c2fb25	242	fn = rcu_dereference(f6i->fib6_node);
c5cff856 WW	243
	244	if (fn) {
	245	*cookie = fn->fn_sernum;
bbd63f06 WW	246	/* pairs with smp_wmb() in fib6_update_sernum_upto_root() */
bbd63f06 WW	247	smp_rmb();
c5cff856 WW	248	status = true;
	249	}
	250
c5cff856 WW	251	return status;
	252	}
	253
b197df4f MKL	254	static inline u32 rt6_get_cookie(const struct rt6_info *rt)
b197df4f MKL	255	{
a68886a6	256	struct fib6_info *from;
c5cff856 WW	257	u32 cookie = 0;
c5cff856 WW	258
a87b7dc9 DA	259	rcu_read_lock();
a87b7dc9 DA	260
a68886a6 DA	261	from = rcu_dereference(rt->from);
	262	if (from && (rt->rt6i_flags & RTF_PCPU \|\|
	263	unlikely(!list_empty(&rt->rt6i_uncached))))
	264	fib6_get_cookie_safe(from, &cookie);
3da59bd9	265
a87b7dc9	266	rcu_read_unlock();
c5cff856 WW	267
c5cff856 WW	268	return cookie;
b197df4f	269	}
1716a961	270
94e187c0 AW	271	static inline void ip6_rt_put(struct rt6_info *rt)
	272	{
	273	/* dst_release() accepts a NULL parameter.
	274	* We rely on dst being first structure in struct rt6_info
	275	*/
	276	BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
	277	dst_release(&rt->dst);
	278	}
	279
8d1c802b	280	struct fib6_info *fib6_info_alloc(gfp_t gfp_flags);
9b0a8da8	281	void fib6_info_destroy_rcu(struct rcu_head *head);
a460aa83	282
8d1c802b	283	static inline void fib6_info_hold(struct fib6_info *f6i)
a460aa83	284	{
f05713e0	285	refcount_inc(&f6i->fib6_ref);
a460aa83 IS	286	}
a460aa83 IS	287
e873e4b9 WW	288	static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
e873e4b9 WW	289	{
f05713e0	290	return refcount_inc_not_zero(&f6i->fib6_ref);
e873e4b9 WW	291	}
e873e4b9 WW	292
8d1c802b	293	static inline void fib6_info_release(struct fib6_info *f6i)
a460aa83	294	{
f05713e0	295	if (f6i && refcount_dec_and_test(&f6i->fib6_ref))
9b0a8da8	296	call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
a460aa83 IS	297	}
a460aa83 IS	298
94b2cfe0 HFS	299	enum fib6_walk_state {
	300	#ifdef CONFIG_IPV6_SUBTREES
	301	FWS_S,
	302	#endif
	303	FWS_L,
	304	FWS_R,
	305	FWS_C,
	306	FWS_U
	307	};
	308
	309	struct fib6_walker {
bbef49da	310	struct list_head lh;
1da177e4	311	struct fib6_node root, node;
8d1c802b	312	struct fib6_info *leaf;
94b2cfe0	313	enum fib6_walk_state state;
2bec5a36 PM	314	unsigned int skip;
2bec5a36 PM	315	unsigned int count;
94b2cfe0	316	int (func)(struct fib6_walker );
1da177e4 LT	317	void *args;
	318	};
	319
1da177e4	320	struct rt6_statistics {
81eb8447 WW	321	__u32 fib_nodes; /* all fib6 nodes */
	322	__u32 fib_route_nodes; /* intermediate nodes */
	323	__u32 fib_rt_entries; /* rt entries in fib table */
	324	__u32 fib_rt_cache; /* cached rt entries in exception table */
	325	__u32 fib_discarded_routes; /* total number of routes delete */
	326
	327	/* The following stats are not protected by any lock */
	328	atomic_t fib_rt_alloc; /* total number of routes alloced */
	329	atomic_t fib_rt_uncache; /* rt entries in uncached list */
1da177e4 LT	330	};
	331
	332	#define RTN_TL_ROOT 0x0001
	333	#define RTN_ROOT 0x0002 /* tree root node */
	334	#define RTN_RTINFO 0x0004 /* node with valid routing info */
	335
	336	/*
	337	* priority levels (or metrics)
	338	*
	339	*/
	340
1da177e4	341
c71099ac TG	342	struct fib6_table {
	343	struct hlist_node tb6_hlist;
	344	u32 tb6_id;
66f5d6ce	345	spinlock_t tb6_lock;
c71099ac	346	struct fib6_node tb6_root;
8e773277	347	struct inet_peer_base tb6_peers;
830218c1	348	unsigned int flags;
e1ee0a5b	349	unsigned int fib_seq;
830218c1	350	#define RT6_TABLE_HAS_DFLT_ROUTER BIT(0)
c71099ac TG	351	};
	352
	353	#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
	354	#define RT6_TABLE_MAIN RT_TABLE_MAIN
c71099ac TG	355	#define RT6_TABLE_DFLT RT6_TABLE_MAIN
	356	#define RT6_TABLE_INFO RT6_TABLE_MAIN
	357	#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
	358
	359	#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	360	#define FIB6_TABLE_MIN 1
	361	#define FIB6_TABLE_MAX RT_TABLE_MAX
101367c2	362	#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
c71099ac TG	363	#else
	364	#define FIB6_TABLE_MIN RT_TABLE_MAIN
	365	#define FIB6_TABLE_MAX FIB6_TABLE_MIN
101367c2	366	#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
c71099ac TG	367	#endif
c71099ac TG	368
8ed67789 DL	369	typedef struct rt6_info (pol_lookup_t)(struct net *,
8ed67789 DL	370	struct fib6_table *,
b75cc8f9 DA	371	struct flowi6 *,
b75cc8f9 DA	372	const struct sk_buff *, int);
1da177e4	373
df77fe4d IS	374	struct fib6_entry_notifier_info {
df77fe4d IS	375	struct fib_notifier_info info; /* must be first */
8d1c802b	376	struct fib6_info *rt;
df77fe4d IS	377	};
df77fe4d IS	378
1da177e4 LT	379	/*
	380	* exported functions
	381	*/
	382
5c3a0fd7 JP	383	struct fib6_table fib6_get_table(struct net net, u32 id);
	384	struct fib6_table fib6_new_table(struct net net, u32 id);
	385	struct dst_entry fib6_rule_lookup(struct net net, struct flowi6 *fl6,
b75cc8f9	386	const struct sk_buff *skb,
5c3a0fd7	387	int flags, pol_lookup_t lookup);
c71099ac	388
138118ec DA	389	/* called with rcu lock held; can return error pointer
	390	* caller needs to select path
	391	*/
effda4dd DA	392	int fib6_lookup(struct net net, int oif, struct flowi6 fl6,
effda4dd DA	393	struct fib6_result *res, int flags);
138118ec	394
1d053da9	395	/* called with rcu lock held; caller needs to select path */
effda4dd DA	396	int fib6_table_lookup(struct net net, struct fib6_table table,
	397	int oif, struct flowi6 fl6, struct fib6_result res,
	398	int strict);
1d053da9	399
b1d40991 DA	400	void fib6_select_path(const struct net net, struct fib6_result res,
	401	struct flowi6 *fl6, int oif, bool have_oif_match,
	402	const struct sk_buff *skb, int strict);
6454743b DA	403	struct fib6_node fib6_node_lookup(struct fib6_node root,
	404	const struct in6_addr *daddr,
	405	const struct in6_addr *saddr);
1da177e4	406
5c3a0fd7 JP	407	struct fib6_node fib6_locate(struct fib6_node root,
5c3a0fd7 JP	408	const struct in6_addr *daddr, int dst_len,
38fbeeee WW	409	const struct in6_addr *saddr, int src_len,
38fbeeee WW	410	bool exact_match);
1da177e4	411
8d1c802b	412	void fib6_clean_all(struct net net, int (func)(struct fib6_info , void arg),
0c3584d5	413	void *arg);
7c6bb7d2 DA	414	void fib6_clean_all_skip_notify(struct net *net,
	415	int (func)(struct fib6_info , void *arg),
	416	void *arg);
c71099ac	417
8d1c802b	418	int fib6_add(struct fib6_node root, struct fib6_info rt,
d4ead6b3	419	struct nl_info info, struct netlink_ext_ack extack);
8d1c802b	420	int fib6_del(struct fib6_info rt, struct nl_info info);
1da177e4	421
67edf21e DA	422	static inline
	423	void rt6_get_prefsrc(const struct rt6_info rt, struct in6_addr addr)
	424	{
	425	const struct fib6_info *from;
	426
	427	rcu_read_lock();
	428
	429	from = rcu_dereference(rt->from);
	430	if (from) {
	431	*addr = from->fib6_prefsrc.addr;
	432	} else {
	433	struct in6_addr in6_zero = {};
	434
	435	*addr = in6_zero;
	436	}
	437
	438	rcu_read_unlock();
	439	}
	440
9ee8cbb2 DA	441	static inline struct net_device fib6_info_nh_dev(const struct fib6_info f6i)
9ee8cbb2 DA	442	{
ad1601ae	443	return f6i->fib6_nh.fib_nh_dev;
9ee8cbb2 DA	444	}
9ee8cbb2 DA	445
83c44251 DA	446	int fib6_nh_init(struct net net, struct fib6_nh fib6_nh,
	447	struct fib6_config *cfg, gfp_t gfp_flags,
	448	struct netlink_ext_ack *extack);
dac7d0f2	449	void fib6_nh_release(struct fib6_nh *fib6_nh);
83c44251	450
8d1c802b	451	void inet6_rt_notify(int event, struct fib6_info rt, struct nl_info info,
37a1d361	452	unsigned int flags);
1da177e4	453
5c3a0fd7	454	void fib6_run_gc(unsigned long expires, struct net *net, bool force);
1da177e4	455
5c3a0fd7	456	void fib6_gc_cleanup(void);
1da177e4	457
5c3a0fd7	458	int fib6_init(void);
101367c2	459
c3506372 CH	460	struct ipv6_route_iter {
	461	struct seq_net_private p;
	462	struct fib6_walker w;
	463	loff_t skip;
	464	struct fib6_table *tbl;
	465	int sernum;
	466	};
	467
	468	extern const struct seq_operations ipv6_route_seq_ops;
8d2ca1d7	469
16ab6d7d IS	470	int call_fib6_notifier(struct notifier_block nb, struct net net,
	471	enum fib_event_type event_type,
	472	struct fib_notifier_info *info);
	473	int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
	474	struct fib_notifier_info *info);
	475
	476	int __net_init fib6_notifier_init(struct net *net);
	477	void __net_exit fib6_notifier_exit(struct net *net);
	478
e1ee0a5b IS	479	unsigned int fib6_tables_seq_read(struct net *net);
	480	int fib6_tables_dump(struct net net, struct notifier_block nb);
	481
8d1c802b DA	482	void fib6_update_sernum(struct net net, struct fib6_info rt);
8d1c802b DA	483	void fib6_update_sernum_upto_root(struct net net, struct fib6_info rt);
180ca444	484
8d1c802b DA	485	void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
8d1c802b DA	486	static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
d4ead6b3 DA	487	{
	488	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
	489	}
180ca444	490
7e5449c2	491	#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5c3a0fd7 JP	492	int fib6_rules_init(void);
5c3a0fd7 JP	493	void fib6_rules_cleanup(void);
e3ea9731	494	bool fib6_rule_default(const struct fib_rule *rule);
dcb18f76 IS	495	int fib6_rules_dump(struct net net, struct notifier_block nb);
dcb18f76 IS	496	unsigned int fib6_rules_seq_read(struct net *net);
5e5d6fed RP	497
	498	static inline bool fib6_rules_early_flow_dissect(struct net *net,
	499	struct sk_buff *skb,
	500	struct flowi6 *fl6,
	501	struct flow_keys *flkeys)
	502	{
	503	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
	504
	505	if (!net->ipv6.fib6_rules_require_fldissect)
	506	return false;
	507
	508	skb_flow_dissect_flow_keys(skb, flkeys, flag);
	509	fl6->fl6_sport = flkeys->ports.src;
	510	fl6->fl6_dport = flkeys->ports.dst;
	511	fl6->flowi6_proto = flkeys->basic.ip_proto;
	512
	513	return true;
	514	}
7e5449c2 DL	515	#else
	516	static inline int fib6_rules_init(void)
	517	{
	518	return 0;
	519	}
	520	static inline void fib6_rules_cleanup(void)
	521	{
	522	return ;
	523	}
e3ea9731 IS	524	static inline bool fib6_rule_default(const struct fib_rule *rule)
	525	{
	526	return true;
	527	}
dcb18f76 IS	528	static inline int fib6_rules_dump(struct net net, struct notifier_block nb)
	529	{
	530	return 0;
	531	}
	532	static inline unsigned int fib6_rules_seq_read(struct net *net)
	533	{
	534	return 0;
	535	}
5e5d6fed RP	536	static inline bool fib6_rules_early_flow_dissect(struct net *net,
	537	struct sk_buff *skb,
	538	struct flowi6 *fl6,
	539	struct flow_keys *flkeys)
	540	{
	541	return false;
	542	}
7e5449c2	543	#endif
1da177e4	544	#endif