[linux-block.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;
	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;
};

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 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 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				should_flush:1,
					dst_nocount:1,
					dst_nopolicy:1,
					fib6_destroying:1,
					offload:1,
					trap:1,
					unused:2;

	struct rcu_head			rcu;
	struct nexthop			*nh;
	struct fib6_nh			fib6_nh[];
};

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 bool fib6_requires_src(const struct fib6_info *rt)
{
	return rt->fib6_src.plen > 0;
}

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)
		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))
		call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
}

static inline void fib6_info_hw_flags_set(struct fib6_info *f6i, bool offload,
					  bool trap)
{
	f6i->offload = offload;
	f6i->trap = trap;
}

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 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;
	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);

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();
}

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);

int call_fib6_entry_notifiers(struct net *net,
			      enum fib_event_type event_type,
			      struct fib6_info *rt,
			      struct netlink_ext_ack *extack);
int call_fib6_multipath_entry_notifiers(struct net *net,
					enum fib_event_type event_type,
					struct fib6_info *rt,
					unsigned int nsiblings,
					struct netlink_ext_ack *extack);
int call_fib6_entry_notifiers_replace(struct net *net, struct fib6_info *rt);
void fib6_rt_update(struct net *net, struct fib6_info *rt,
		    struct nl_info *info);
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,
		       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,
		     struct netlink_ext_ack *extack);

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_update_sernum_stub(struct net *net, struct fib6_info *f6i);

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
static inline bool fib6_has_custom_rules(const struct net *net)
{
	return net->ipv6.fib6_has_custom_rules;
}

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,
		    struct netlink_ext_ack *extack);
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 bool fib6_has_custom_rules(const struct net *net)
{
	return false;
}
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,
				  struct netlink_ext_ack *extack)
{
	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;
5b98324e	52	u32 fc_nh_id;
86872cb5 TG	53
	54	struct in6_addr fc_dst;
	55	struct in6_addr fc_src;
c3968a85	56	struct in6_addr fc_prefsrc;
86872cb5 TG	57	struct in6_addr fc_gateway;
	58
	59	unsigned long fc_expires;
	60	struct nlattr *fc_mx;
	61	int fc_mx_len;
51ebd318 ND	62	int fc_mp_len;
51ebd318 ND	63	struct nlattr *fc_mp;
86872cb5 TG	64
86872cb5 TG	65	struct nl_info fc_nlinfo;
19e42e45 RP	66	struct nlattr *fc_encap;
19e42e45 RP	67	u16 fc_encap_type;
86872cb5 TG	68	};
86872cb5 TG	69
fd2c3ef7	70	struct fib6_node {
66f5d6ce WW	71	struct fib6_node __rcu *parent;
	72	struct fib6_node __rcu *left;
	73	struct fib6_node __rcu *right;
8bce65b9	74	#ifdef CONFIG_IPV6_SUBTREES
66f5d6ce	75	struct fib6_node __rcu *subtree;
8bce65b9	76	#endif
8d1c802b	77	struct fib6_info __rcu *leaf;
1da177e4 LT	78
	79	__u16 fn_bit; /* bit key */
	80	__u16 fn_flags;
42b18706	81	int fn_sernum;
8d1c802b	82	struct fib6_info __rcu *rr_ptr;
c5cff856	83	struct rcu_head rcu;
1da177e4 LT	84	};
1da177e4 LT	85
c757faa8 WW	86	struct fib6_gc_args {
	87	int timeout;
	88	int more;
	89	};
	90
7fc33165 YH	91	#ifndef CONFIG_IPV6_SUBTREES
7fc33165 YH	92	#define FIB6_SUBTREE(fn) NULL
b9b33e7c PA	93
	94	static inline bool fib6_routes_require_src(const struct net *net)
	95	{
	96	return false;
	97	}
	98
	99	static inline void fib6_routes_require_src_inc(struct net *net) {}
	100	static inline void fib6_routes_require_src_dec(struct net *net) {}
	101
7fc33165	102	#else
b9b33e7c PA	103
	104	static inline bool fib6_routes_require_src(const struct net *net)
	105	{
	106	return net->ipv6.fib6_routes_require_src > 0;
	107	}
	108
	109	static inline void fib6_routes_require_src_inc(struct net *net)
	110	{
	111	net->ipv6.fib6_routes_require_src++;
	112	}
	113
	114	static inline void fib6_routes_require_src_dec(struct net *net)
	115	{
	116	net->ipv6.fib6_routes_require_src--;
	117	}
	118
66f5d6ce	119	#define FIB6_SUBTREE(fn) (rcu_dereference_protected((fn)->subtree, 1))
7fc33165	120	#endif
1da177e4 LT	121
	122	/*
	123	* routing information
	124	*
	125	*/
	126
fd2c3ef7	127	struct rt6key {
1da177e4 LT	128	struct in6_addr addr;
	129	int plen;
	130	};
	131
c71099ac TG	132	struct fib6_table;
c71099ac TG	133
35732d01 WW	134	struct rt6_exception_bucket {
	135	struct hlist_head chain;
	136	int depth;
	137	};
	138
	139	struct rt6_exception {
	140	struct hlist_node hlist;
	141	struct rt6_info *rt6i;
	142	unsigned long stamp;
	143	struct rcu_head rcu;
	144	};
	145
	146	#define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
	147	#define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
	148	#define FIB6_MAX_DEPTH 5
	149
5e670d84	150	struct fib6_nh {
f1741730	151	struct fib_nh_common nh_common;
cc3a86c8 DA	152
	153	#ifdef CONFIG_IPV6_ROUTER_PREF
	154	unsigned long last_probe;
	155	#endif
f40b6ae2 DA	156
f40b6ae2 DA	157	struct rt6_info * __percpu *rt6i_pcpu;
cc5c073a	158	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
5e670d84	159	};
1da177e4	160
a64efe14	161	struct fib6_info {
93c2fb25	162	struct fib6_table *fib6_table;
8fb11a9a	163	struct fib6_info __rcu *fib6_next;
93c2fb25	164	struct fib6_node __rcu *fib6_node;
1da177e4	165
51ebd318	166	/* Multipath routes:
a64efe14	167	* siblings is a list of fib6_info that have the the same metric/weight,
51ebd318 ND	168	* destination, but not the same gateway. nsiblings is just a cache
	169	* to speed up lookup.
	170	*/
f88d8ea6 DA	171	union {
	172	struct list_head fib6_siblings;
	173	struct list_head nh_list;
	174	};
93c2fb25	175	unsigned int fib6_nsiblings;
51ebd318	176
f05713e0	177	refcount_t fib6_ref;
a64efe14 DA	178	unsigned long expires;
	179	struct dst_metrics *fib6_metrics;
	180	#define fib6_pmtu fib6_metrics->metrics[RTAX_MTU-1]
a47ed4cd	181
93c2fb25 DA	182	struct rt6key fib6_dst;
	183	u32 fib6_flags;
	184	struct rt6key fib6_src;
	185	struct rt6key fib6_prefsrc;
fe400799	186
93c2fb25 DA	187	u32 fib6_metric;
93c2fb25 DA	188	u8 fib6_protocol;
a64efe14	189	u8 fib6_type;
cc5c073a	190	u8 should_flush:1,
a64efe14 DA	191	dst_nocount:1,
a64efe14 DA	192	dst_nopolicy:1,
61fb0d01	193	fib6_destroying:1,
bb3c4ab9 IS	194	offload:1,
bb3c4ab9 IS	195	trap:1,
af13b3c3	196	unused:2;
a64efe14	197
9b0a8da8	198	struct rcu_head rcu;
f88d8ea6	199	struct nexthop *nh;
6e68f499	200	struct fib6_nh fib6_nh[];
a64efe14 DA	201	};
a64efe14 DA	202
fd2c3ef7	203	struct rt6_info {
d8d1f30b	204	struct dst_entry dst;
a68886a6	205	struct fib6_info __rcu *from;
1da177e4	206
77634cc6	207	struct rt6key rt6i_dst;
bd2c77a0	208	struct rt6key rt6i_src;
1da177e4	209	struct in6_addr rt6i_gateway;
77634cc6	210	struct inet6_dev *rt6i_idev;
bd2c77a0	211	u32 rt6i_flags;
b4ce9277	212
8d0b94af MKL	213	struct list_head rt6i_uncached;
	214	struct uncached_list *rt6i_uncached_list;
	215
bd2c77a0 YH	216	/* more non-fragment space at head required */
bd2c77a0 YH	217	unsigned short rt6i_nfheader_len;
1da177e4 LT	218	};
1da177e4 LT	219
b1d40991 DA	220	struct fib6_result {
	221	struct fib6_nh *nh;
	222	struct fib6_info *f6i;
7d21fec9 DA	223	u32 fib6_flags;
7d21fec9 DA	224	u8 fib6_type;
a65120ba	225	struct rt6_info *rt6;
b1d40991 DA	226	};
b1d40991 DA	227
66f5d6ce WW	228	#define for_each_fib6_node_rt_rcu(fn) \
66f5d6ce WW	229	for (rt = rcu_dereference((fn)->leaf); rt; \
8fb11a9a	230	rt = rcu_dereference(rt->fib6_next))
66f5d6ce WW	231
	232	#define for_each_fib6_walker_rt(w) \
	233	for (rt = (w)->leaf; rt; \
8fb11a9a	234	rt = rcu_dereference_protected(rt->fib6_next, 1))
66f5d6ce	235
7a3025b1 YH	236	static inline struct inet6_dev ip6_dst_idev(struct dst_entry dst)
	237	{
	238	return ((struct rt6_info *)dst)->rt6i_idev;
	239	}
	240
b9b33e7c PA	241	static inline bool fib6_requires_src(const struct fib6_info *rt)
	242	{
	243	return rt->fib6_src.plen > 0;
	244	}
	245
8d1c802b	246	static inline void fib6_clean_expires(struct fib6_info *f6i)
1716a961	247	{
93c2fb25	248	f6i->fib6_flags &= ~RTF_EXPIRES;
14895687	249	f6i->expires = 0;
1716a961 G	250	}
1716a961 G	251
8d1c802b	252	static inline void fib6_set_expires(struct fib6_info *f6i,
14895687	253	unsigned long expires)
1716a961	254	{
14895687	255	f6i->expires = expires;
93c2fb25	256	f6i->fib6_flags \|= RTF_EXPIRES;
1716a961 G	257	}
1716a961 G	258
8d1c802b	259	static inline bool fib6_check_expired(const struct fib6_info *f6i)
1716a961	260	{
93c2fb25	261	if (f6i->fib6_flags & RTF_EXPIRES)
14895687 DA	262	return time_after(jiffies, f6i->expires);
14895687 DA	263	return false;
1716a961	264	}
b197df4f	265
c5cff856 WW	266	/* Function to safely get fn->sernum for passed in rt
	267	* and store result in passed in cookie.
	268	* Return true if we can get cookie safely
	269	* Return false if not
	270	*/
a269f1a7 DA	271	static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
a269f1a7 DA	272	u32 *cookie)
c5cff856 WW	273	{
	274	struct fib6_node *fn;
	275	bool status = false;
	276
93c2fb25	277	fn = rcu_dereference(f6i->fib6_node);
c5cff856 WW	278
	279	if (fn) {
	280	*cookie = fn->fn_sernum;
bbd63f06 WW	281	/* pairs with smp_wmb() in fib6_update_sernum_upto_root() */
bbd63f06 WW	282	smp_rmb();
c5cff856 WW	283	status = true;
	284	}
	285
c5cff856 WW	286	return status;
	287	}
	288
b197df4f MKL	289	static inline u32 rt6_get_cookie(const struct rt6_info *rt)
b197df4f MKL	290	{
a68886a6	291	struct fib6_info *from;
c5cff856 WW	292	u32 cookie = 0;
c5cff856 WW	293
a87b7dc9 DA	294	rcu_read_lock();
a87b7dc9 DA	295
a68886a6	296	from = rcu_dereference(rt->from);
b7999b07	297	if (from)
a68886a6	298	fib6_get_cookie_safe(from, &cookie);
3da59bd9	299
a87b7dc9	300	rcu_read_unlock();
c5cff856 WW	301
c5cff856 WW	302	return cookie;
b197df4f	303	}
1716a961	304
94e187c0 AW	305	static inline void ip6_rt_put(struct rt6_info *rt)
	306	{
	307	/* dst_release() accepts a NULL parameter.
	308	* We rely on dst being first structure in struct rt6_info
	309	*/
	310	BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
	311	dst_release(&rt->dst);
	312	}
	313
1cf844c7	314	struct fib6_info *fib6_info_alloc(gfp_t gfp_flags, bool with_fib6_nh);
9b0a8da8	315	void fib6_info_destroy_rcu(struct rcu_head *head);
a460aa83	316
8d1c802b	317	static inline void fib6_info_hold(struct fib6_info *f6i)
a460aa83	318	{
f05713e0	319	refcount_inc(&f6i->fib6_ref);
a460aa83 IS	320	}
a460aa83 IS	321
e873e4b9 WW	322	static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
e873e4b9 WW	323	{
f05713e0	324	return refcount_inc_not_zero(&f6i->fib6_ref);
e873e4b9 WW	325	}
e873e4b9 WW	326
8d1c802b	327	static inline void fib6_info_release(struct fib6_info *f6i)
a460aa83	328	{
f05713e0	329	if (f6i && refcount_dec_and_test(&f6i->fib6_ref))
9b0a8da8	330	call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
a460aa83 IS	331	}
a460aa83 IS	332
bb3c4ab9 IS	333	static inline void fib6_info_hw_flags_set(struct fib6_info *f6i, bool offload,
	334	bool trap)
	335	{
	336	f6i->offload = offload;
	337	f6i->trap = trap;
	338	}
	339
94b2cfe0 HFS	340	enum fib6_walk_state {
	341	#ifdef CONFIG_IPV6_SUBTREES
	342	FWS_S,
	343	#endif
	344	FWS_L,
	345	FWS_R,
	346	FWS_C,
	347	FWS_U
	348	};
	349
	350	struct fib6_walker {
bbef49da	351	struct list_head lh;
1da177e4	352	struct fib6_node root, node;
8d1c802b	353	struct fib6_info *leaf;
94b2cfe0	354	enum fib6_walk_state state;
2bec5a36 PM	355	unsigned int skip;
2bec5a36 PM	356	unsigned int count;
1e47b483	357	unsigned int skip_in_node;
94b2cfe0	358	int (func)(struct fib6_walker );
1da177e4 LT	359	void *args;
	360	};
	361
1da177e4	362	struct rt6_statistics {
81eb8447 WW	363	__u32 fib_nodes; /* all fib6 nodes */
	364	__u32 fib_route_nodes; /* intermediate nodes */
	365	__u32 fib_rt_entries; /* rt entries in fib table */
	366	__u32 fib_rt_cache; /* cached rt entries in exception table */
	367	__u32 fib_discarded_routes; /* total number of routes delete */
	368
	369	/* The following stats are not protected by any lock */
	370	atomic_t fib_rt_alloc; /* total number of routes alloced */
	371	atomic_t fib_rt_uncache; /* rt entries in uncached list */
1da177e4 LT	372	};
	373
	374	#define RTN_TL_ROOT 0x0001
	375	#define RTN_ROOT 0x0002 /* tree root node */
	376	#define RTN_RTINFO 0x0004 /* node with valid routing info */
	377
	378	/*
	379	* priority levels (or metrics)
	380	*
	381	*/
	382
1da177e4	383
c71099ac TG	384	struct fib6_table {
	385	struct hlist_node tb6_hlist;
	386	u32 tb6_id;
66f5d6ce	387	spinlock_t tb6_lock;
c71099ac	388	struct fib6_node tb6_root;
8e773277	389	struct inet_peer_base tb6_peers;
830218c1	390	unsigned int flags;
e1ee0a5b	391	unsigned int fib_seq;
830218c1	392	#define RT6_TABLE_HAS_DFLT_ROUTER BIT(0)
c71099ac TG	393	};
	394
	395	#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
	396	#define RT6_TABLE_MAIN RT_TABLE_MAIN
c71099ac TG	397	#define RT6_TABLE_DFLT RT6_TABLE_MAIN
	398	#define RT6_TABLE_INFO RT6_TABLE_MAIN
	399	#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
	400
	401	#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	402	#define FIB6_TABLE_MIN 1
	403	#define FIB6_TABLE_MAX RT_TABLE_MAX
101367c2	404	#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
c71099ac TG	405	#else
	406	#define FIB6_TABLE_MIN RT_TABLE_MAIN
	407	#define FIB6_TABLE_MAX FIB6_TABLE_MIN
101367c2	408	#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
c71099ac TG	409	#endif
c71099ac TG	410
8ed67789 DL	411	typedef struct rt6_info (pol_lookup_t)(struct net *,
8ed67789 DL	412	struct fib6_table *,
b75cc8f9 DA	413	struct flowi6 *,
b75cc8f9 DA	414	const struct sk_buff *, int);
1da177e4	415
df77fe4d IS	416	struct fib6_entry_notifier_info {
df77fe4d IS	417	struct fib_notifier_info info; /* must be first */
8d1c802b	418	struct fib6_info *rt;
d4b96c7b	419	unsigned int nsiblings;
df77fe4d IS	420	};
df77fe4d IS	421
1da177e4 LT	422	/*
	423	* exported functions
	424	*/
	425
5c3a0fd7 JP	426	struct fib6_table fib6_get_table(struct net net, u32 id);
	427	struct fib6_table fib6_new_table(struct net net, u32 id);
	428	struct dst_entry fib6_rule_lookup(struct net net, struct flowi6 *fl6,
b75cc8f9	429	const struct sk_buff *skb,
5c3a0fd7	430	int flags, pol_lookup_t lookup);
c71099ac	431
138118ec DA	432	/* called with rcu lock held; can return error pointer
	433	* caller needs to select path
	434	*/
effda4dd DA	435	int fib6_lookup(struct net net, int oif, struct flowi6 fl6,
effda4dd DA	436	struct fib6_result *res, int flags);
138118ec	437
1d053da9	438	/* called with rcu lock held; caller needs to select path */
effda4dd DA	439	int fib6_table_lookup(struct net net, struct fib6_table table,
	440	int oif, struct flowi6 fl6, struct fib6_result res,
	441	int strict);
1d053da9	442
b1d40991 DA	443	void fib6_select_path(const struct net net, struct fib6_result res,
	444	struct flowi6 *fl6, int oif, bool have_oif_match,
	445	const struct sk_buff *skb, int strict);
6454743b DA	446	struct fib6_node fib6_node_lookup(struct fib6_node root,
	447	const struct in6_addr *daddr,
	448	const struct in6_addr *saddr);
1da177e4	449
5c3a0fd7 JP	450	struct fib6_node fib6_locate(struct fib6_node root,
5c3a0fd7 JP	451	const struct in6_addr *daddr, int dst_len,
38fbeeee WW	452	const struct in6_addr *saddr, int src_len,
38fbeeee WW	453	bool exact_match);
1da177e4	454
8d1c802b	455	void fib6_clean_all(struct net net, int (func)(struct fib6_info , void arg),
0c3584d5	456	void *arg);
7c6bb7d2 DA	457	void fib6_clean_all_skip_notify(struct net *net,
	458	int (func)(struct fib6_info , void *arg),
	459	void *arg);
c71099ac	460
8d1c802b	461	int fib6_add(struct fib6_node root, struct fib6_info rt,
d4ead6b3	462	struct nl_info info, struct netlink_ext_ack extack);
8d1c802b	463	int fib6_del(struct fib6_info rt, struct nl_info info);
1da177e4	464
67edf21e DA	465	static inline
	466	void rt6_get_prefsrc(const struct rt6_info rt, struct in6_addr addr)
	467	{
	468	const struct fib6_info *from;
	469
	470	rcu_read_lock();
	471
	472	from = rcu_dereference(rt->from);
	473	if (from) {
	474	*addr = from->fib6_prefsrc.addr;
	475	} else {
	476	struct in6_addr in6_zero = {};
	477
	478	*addr = in6_zero;
	479	}
	480
	481	rcu_read_unlock();
	482	}
9ee8cbb2	483
83c44251 DA	484	int fib6_nh_init(struct net net, struct fib6_nh fib6_nh,
	485	struct fib6_config *cfg, gfp_t gfp_flags,
	486	struct netlink_ext_ack *extack);
dac7d0f2	487	void fib6_nh_release(struct fib6_nh *fib6_nh);
83c44251	488
19a3b7ee DA	489	int call_fib6_entry_notifiers(struct net *net,
	490	enum fib_event_type event_type,
	491	struct fib6_info *rt,
	492	struct netlink_ext_ack *extack);
d4b96c7b IS	493	int call_fib6_multipath_entry_notifiers(struct net *net,
	494	enum fib_event_type event_type,
	495	struct fib6_info *rt,
	496	unsigned int nsiblings,
	497	struct netlink_ext_ack *extack);
d2f0c9b1	498	int call_fib6_entry_notifiers_replace(struct net net, struct fib6_info rt);
19a3b7ee DA	499	void fib6_rt_update(struct net net, struct fib6_info rt,
19a3b7ee DA	500	struct nl_info *info);
8d1c802b	501	void inet6_rt_notify(int event, struct fib6_info rt, struct nl_info info,
37a1d361	502	unsigned int flags);
1da177e4	503
5c3a0fd7	504	void fib6_run_gc(unsigned long expires, struct net *net, bool force);
1da177e4	505
5c3a0fd7	506	void fib6_gc_cleanup(void);
1da177e4	507
5c3a0fd7	508	int fib6_init(void);
101367c2	509
c3506372 CH	510	struct ipv6_route_iter {
	511	struct seq_net_private p;
	512	struct fib6_walker w;
	513	loff_t skip;
	514	struct fib6_table *tbl;
	515	int sernum;
	516	};
	517
	518	extern const struct seq_operations ipv6_route_seq_ops;
8d2ca1d7	519
7c550daf	520	int call_fib6_notifier(struct notifier_block *nb,
16ab6d7d IS	521	enum fib_event_type event_type,
	522	struct fib_notifier_info *info);
	523	int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
	524	struct fib_notifier_info *info);
	525
	526	int __net_init fib6_notifier_init(struct net *net);
	527	void __net_exit fib6_notifier_exit(struct net *net);
	528
e1ee0a5b	529	unsigned int fib6_tables_seq_read(struct net *net);
b7a59557 JP	530	int fib6_tables_dump(struct net net, struct notifier_block nb,
b7a59557 JP	531	struct netlink_ext_ack *extack);
e1ee0a5b	532
8d1c802b DA	533	void fib6_update_sernum(struct net net, struct fib6_info rt);
8d1c802b DA	534	void fib6_update_sernum_upto_root(struct net net, struct fib6_info rt);
cdaa16a4	535	void fib6_update_sernum_stub(struct net net, struct fib6_info f6i);
180ca444	536
8d1c802b DA	537	void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
8d1c802b DA	538	static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
d4ead6b3 DA	539	{
	540	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
	541	}
180ca444	542
7e5449c2	543	#ifdef CONFIG_IPV6_MULTIPLE_TABLES
1f8ac570 PA	544	static inline bool fib6_has_custom_rules(const struct net *net)
	545	{
	546	return net->ipv6.fib6_has_custom_rules;
	547	}
	548
5c3a0fd7 JP	549	int fib6_rules_init(void);
5c3a0fd7 JP	550	void fib6_rules_cleanup(void);
e3ea9731	551	bool fib6_rule_default(const struct fib_rule *rule);
b7a59557 JP	552	int fib6_rules_dump(struct net net, struct notifier_block nb,
b7a59557 JP	553	struct netlink_ext_ack *extack);
dcb18f76	554	unsigned int fib6_rules_seq_read(struct net *net);
5e5d6fed RP	555
	556	static inline bool fib6_rules_early_flow_dissect(struct net *net,
	557	struct sk_buff *skb,
	558	struct flowi6 *fl6,
	559	struct flow_keys *flkeys)
	560	{
	561	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
	562
	563	if (!net->ipv6.fib6_rules_require_fldissect)
	564	return false;
	565
	566	skb_flow_dissect_flow_keys(skb, flkeys, flag);
	567	fl6->fl6_sport = flkeys->ports.src;
	568	fl6->fl6_dport = flkeys->ports.dst;
	569	fl6->flowi6_proto = flkeys->basic.ip_proto;
	570
	571	return true;
	572	}
7e5449c2	573	#else
1f8ac570 PA	574	static inline bool fib6_has_custom_rules(const struct net *net)
	575	{
	576	return false;
	577	}
7e5449c2 DL	578	static inline int fib6_rules_init(void)
	579	{
	580	return 0;
	581	}
	582	static inline void fib6_rules_cleanup(void)
	583	{
	584	return ;
	585	}
e3ea9731 IS	586	static inline bool fib6_rule_default(const struct fib_rule *rule)
	587	{
	588	return true;
	589	}
b7a59557 JP	590	static inline int fib6_rules_dump(struct net net, struct notifier_block nb,
b7a59557 JP	591	struct netlink_ext_ack *extack)
dcb18f76 IS	592	{
	593	return 0;
	594	}
	595	static inline unsigned int fib6_rules_seq_read(struct net *net)
	596	{
	597	return 0;
	598	}
5e5d6fed RP	599	static inline bool fib6_rules_early_flow_dissect(struct net *net,
	600	struct sk_buff *skb,
	601	struct flowi6 *fl6,
	602	struct flow_keys *flkeys)
	603	{
	604	return false;
	605	}
7e5449c2	606	#endif
1da177e4	607	#endif