[mirror_ubuntu-jammy-kernel.git] / include / net / nexthop.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Generic nexthop implementation
 *
 * Copyright (c) 2017-19 Cumulus Networks
 * Copyright (c) 2017-19 David Ahern <dsa@cumulusnetworks.com>
 */

#ifndef __LINUX_NEXTHOP_H
#define __LINUX_NEXTHOP_H

#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/route.h>
#include <linux/types.h>
#include <net/ip_fib.h>
#include <net/ip6_fib.h>
#include <net/netlink.h>

#define NEXTHOP_VALID_USER_FLAGS RTNH_F_ONLINK

struct nexthop;

struct nh_config {
	u32		nh_id;

	u8		nh_family;
	u8		nh_protocol;
	u8		nh_blackhole;
	u8		nh_fdb;
	u32		nh_flags;

	int		nh_ifindex;
	struct net_device *dev;

	union {
		__be32		ipv4;
		struct in6_addr	ipv6;
	} gw;

	struct nlattr	*nh_grp;
	u16		nh_grp_type;

	struct nlattr	*nh_encap;
	u16		nh_encap_type;

	u32		nlflags;
	struct nl_info	nlinfo;
};

struct nh_info {
	struct hlist_node	dev_hash;    /* entry on netns devhash */
	struct nexthop		*nh_parent;

	u8			family;
	bool			reject_nh;
	bool			fdb_nh;

	union {
		struct fib_nh_common	fib_nhc;
		struct fib_nh		fib_nh;
		struct fib6_nh		fib6_nh;
	};
};

struct nh_grp_entry {
	struct nexthop	*nh;
	u8		weight;
	atomic_t	upper_bound;

	struct list_head nh_list;
	struct nexthop	*nh_parent;  /* nexthop of group with this entry */
};

struct nh_group {
	struct nh_group		*spare; /* spare group for removals */
	u16			num_nh;
	bool			mpath;
	bool			fdb_nh;
	bool			has_v4;
	struct nh_grp_entry	nh_entries[];
};

struct nexthop {
	struct rb_node		rb_node;    /* entry on netns rbtree */
	struct list_head	fi_list;    /* v4 entries using nh */
	struct list_head	f6i_list;   /* v6 entries using nh */
	struct list_head        fdb_list;   /* fdb entries using this nh */
	struct list_head	grp_list;   /* nh group entries using this nh */
	struct net		*net;

	u32			id;

	u8			protocol;   /* app managing this nh */
	u8			nh_flags;
	bool			is_group;

	refcount_t		refcnt;
	struct rcu_head		rcu;

	union {
		struct nh_info	__rcu *nh_info;
		struct nh_group __rcu *nh_grp;
	};
};

enum nexthop_event_type {
	NEXTHOP_EVENT_DEL,
	NEXTHOP_EVENT_REPLACE,
};

struct nh_notifier_single_info {
	struct net_device *dev;
	u8 gw_family;
	union {
		__be32 ipv4;
		struct in6_addr ipv6;
	};
	u8 is_reject:1,
	   is_fdb:1,
	   has_encap:1;
};

struct nh_notifier_grp_entry_info {
	u8 weight;
	u32 id;
	struct nh_notifier_single_info nh;
};

struct nh_notifier_grp_info {
	u16 num_nh;
	bool is_fdb;
	struct nh_notifier_grp_entry_info nh_entries[];
};

struct nh_notifier_info {
	struct net *net;
	struct netlink_ext_ack *extack;
	u32 id;
	bool is_grp;
	union {
		struct nh_notifier_single_info *nh;
		struct nh_notifier_grp_info *nh_grp;
	};
};

int register_nexthop_notifier(struct net *net, struct notifier_block *nb,
			      struct netlink_ext_ack *extack);
int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb);
void nexthop_set_hw_flags(struct net *net, u32 id, bool offload, bool trap);

/* caller is holding rcu or rtnl; no reference taken to nexthop */
struct nexthop *nexthop_find_by_id(struct net *net, u32 id);
void nexthop_free_rcu(struct rcu_head *head);

static inline bool nexthop_get(struct nexthop *nh)
{
	return refcount_inc_not_zero(&nh->refcnt);
}

static inline void nexthop_put(struct nexthop *nh)
{
	if (refcount_dec_and_test(&nh->refcnt))
		call_rcu(&nh->rcu, nexthop_free_rcu);
}

static inline bool nexthop_cmp(const struct nexthop *nh1,
			       const struct nexthop *nh2)
{
	return nh1 == nh2;
}

static inline bool nexthop_is_fdb(const struct nexthop *nh)
{
	if (nh->is_group) {
		const struct nh_group *nh_grp;

		nh_grp = rcu_dereference_rtnl(nh->nh_grp);
		return nh_grp->fdb_nh;
	} else {
		const struct nh_info *nhi;

		nhi = rcu_dereference_rtnl(nh->nh_info);
		return nhi->fdb_nh;
	}
}

static inline bool nexthop_has_v4(const struct nexthop *nh)
{
	if (nh->is_group) {
		struct nh_group *nh_grp;

		nh_grp = rcu_dereference_rtnl(nh->nh_grp);
		return nh_grp->has_v4;
	}
	return false;
}

static inline bool nexthop_is_multipath(const struct nexthop *nh)
{
	if (nh->is_group) {
		struct nh_group *nh_grp;

		nh_grp = rcu_dereference_rtnl(nh->nh_grp);
		return nh_grp->mpath;
	}
	return false;
}

struct nexthop *nexthop_select_path(struct nexthop *nh, int hash);

static inline unsigned int nexthop_num_path(const struct nexthop *nh)
{
	unsigned int rc = 1;

	if (nh->is_group) {
		struct nh_group *nh_grp;

		nh_grp = rcu_dereference_rtnl(nh->nh_grp);
		if (nh_grp->mpath)
			rc = nh_grp->num_nh;
	}

	return rc;
}

static inline
struct nexthop *nexthop_mpath_select(const struct nh_group *nhg, int nhsel)
{
	/* for_nexthops macros in fib_semantics.c grabs a pointer to
	 * the nexthop before checking nhsel
	 */
	if (nhsel >= nhg->num_nh)
		return NULL;

	return nhg->nh_entries[nhsel].nh;
}

static inline
int nexthop_mpath_fill_node(struct sk_buff *skb, struct nexthop *nh,
			    u8 rt_family)
{
	struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
	int i;

	for (i = 0; i < nhg->num_nh; i++) {
		struct nexthop *nhe = nhg->nh_entries[i].nh;
		struct nh_info *nhi = rcu_dereference_rtnl(nhe->nh_info);
		struct fib_nh_common *nhc = &nhi->fib_nhc;
		int weight = nhg->nh_entries[i].weight;

		if (fib_add_nexthop(skb, nhc, weight, rt_family) < 0)
			return -EMSGSIZE;
	}

	return 0;
}

/* called with rcu lock */
static inline bool nexthop_is_blackhole(const struct nexthop *nh)
{
	const struct nh_info *nhi;

	if (nh->is_group) {
		struct nh_group *nh_grp;

		nh_grp = rcu_dereference_rtnl(nh->nh_grp);
		if (nh_grp->num_nh > 1)
			return false;

		nh = nh_grp->nh_entries[0].nh;
	}

	nhi = rcu_dereference_rtnl(nh->nh_info);
	return nhi->reject_nh;
}

static inline void nexthop_path_fib_result(struct fib_result *res, int hash)
{
	struct nh_info *nhi;
	struct nexthop *nh;

	nh = nexthop_select_path(res->fi->nh, hash);
	nhi = rcu_dereference(nh->nh_info);
	res->nhc = &nhi->fib_nhc;
}

/* called with rcu read lock or rtnl held */
static inline
struct fib_nh_common *nexthop_fib_nhc(struct nexthop *nh, int nhsel)
{
	struct nh_info *nhi;

	BUILD_BUG_ON(offsetof(struct fib_nh, nh_common) != 0);
	BUILD_BUG_ON(offsetof(struct fib6_nh, nh_common) != 0);

	if (nh->is_group) {
		struct nh_group *nh_grp;

		nh_grp = rcu_dereference_rtnl(nh->nh_grp);
		if (nh_grp->mpath) {
			nh = nexthop_mpath_select(nh_grp, nhsel);
			if (!nh)
				return NULL;
		}
	}

	nhi = rcu_dereference_rtnl(nh->nh_info);
	return &nhi->fib_nhc;
}

/* called from fib_table_lookup with rcu_lock */
static inline
struct fib_nh_common *nexthop_get_nhc_lookup(const struct nexthop *nh,
					     int fib_flags,
					     const struct flowi4 *flp,
					     int *nhsel)
{
	struct nh_info *nhi;

	if (nh->is_group) {
		struct nh_group *nhg = rcu_dereference(nh->nh_grp);
		int i;

		for (i = 0; i < nhg->num_nh; i++) {
			struct nexthop *nhe = nhg->nh_entries[i].nh;

			nhi = rcu_dereference(nhe->nh_info);
			if (fib_lookup_good_nhc(&nhi->fib_nhc, fib_flags, flp)) {
				*nhsel = i;
				return &nhi->fib_nhc;
			}
		}
	} else {
		nhi = rcu_dereference(nh->nh_info);
		if (fib_lookup_good_nhc(&nhi->fib_nhc, fib_flags, flp)) {
			*nhsel = 0;
			return &nhi->fib_nhc;
		}
	}

	return NULL;
}

static inline bool nexthop_uses_dev(const struct nexthop *nh,
				    const struct net_device *dev)
{
	struct nh_info *nhi;

	if (nh->is_group) {
		struct nh_group *nhg = rcu_dereference(nh->nh_grp);
		int i;

		for (i = 0; i < nhg->num_nh; i++) {
			struct nexthop *nhe = nhg->nh_entries[i].nh;

			nhi = rcu_dereference(nhe->nh_info);
			if (nhc_l3mdev_matches_dev(&nhi->fib_nhc, dev))
				return true;
		}
	} else {
		nhi = rcu_dereference(nh->nh_info);
		if (nhc_l3mdev_matches_dev(&nhi->fib_nhc, dev))
			return true;
	}

	return false;
}

static inline unsigned int fib_info_num_path(const struct fib_info *fi)
{
	if (unlikely(fi->nh))
		return nexthop_num_path(fi->nh);

	return fi->fib_nhs;
}

int fib_check_nexthop(struct nexthop *nh, u8 scope,
		      struct netlink_ext_ack *extack);

static inline struct fib_nh_common *fib_info_nhc(struct fib_info *fi, int nhsel)
{
	if (unlikely(fi->nh))
		return nexthop_fib_nhc(fi->nh, nhsel);

	return &fi->fib_nh[nhsel].nh_common;
}

/* only used when fib_nh is built into fib_info */
static inline struct fib_nh *fib_info_nh(struct fib_info *fi, int nhsel)
{
	WARN_ON(fi->nh);

	return &fi->fib_nh[nhsel];
}

/*
 * IPv6 variants
 */
int fib6_check_nexthop(struct nexthop *nh, struct fib6_config *cfg,
		       struct netlink_ext_ack *extack);

static inline struct fib6_nh *nexthop_fib6_nh(struct nexthop *nh)
{
	struct nh_info *nhi;

	if (nh->is_group) {
		struct nh_group *nh_grp;

		nh_grp = rcu_dereference_rtnl(nh->nh_grp);
		nh = nexthop_mpath_select(nh_grp, 0);
		if (!nh)
			return NULL;
	}

	nhi = rcu_dereference_rtnl(nh->nh_info);
	if (nhi->family == AF_INET6)
		return &nhi->fib6_nh;

	return NULL;
}

static inline struct net_device *fib6_info_nh_dev(struct fib6_info *f6i)
{
	struct fib6_nh *fib6_nh;

	fib6_nh = f6i->nh ? nexthop_fib6_nh(f6i->nh) : f6i->fib6_nh;
	return fib6_nh->fib_nh_dev;
}

static inline void nexthop_path_fib6_result(struct fib6_result *res, int hash)
{
	struct nexthop *nh = res->f6i->nh;
	struct nh_info *nhi;

	nh = nexthop_select_path(nh, hash);

	nhi = rcu_dereference_rtnl(nh->nh_info);
	if (nhi->reject_nh) {
		res->fib6_type = RTN_BLACKHOLE;
		res->fib6_flags |= RTF_REJECT;
		res->nh = nexthop_fib6_nh(nh);
	} else {
		res->nh = &nhi->fib6_nh;
	}
}

int nexthop_for_each_fib6_nh(struct nexthop *nh,
			     int (*cb)(struct fib6_nh *nh, void *arg),
			     void *arg);

static inline int nexthop_get_family(struct nexthop *nh)
{
	struct nh_info *nhi = rcu_dereference_rtnl(nh->nh_info);

	return nhi->family;
}

static inline
struct fib_nh_common *nexthop_fdb_nhc(struct nexthop *nh)
{
	struct nh_info *nhi = rcu_dereference_rtnl(nh->nh_info);

	return &nhi->fib_nhc;
}

static inline struct fib_nh_common *nexthop_path_fdb_result(struct nexthop *nh,
							    int hash)
{
	struct nh_info *nhi;
	struct nexthop *nhp;

	nhp = nexthop_select_path(nh, hash);
	if (unlikely(!nhp))
		return NULL;
	nhi = rcu_dereference(nhp->nh_info);
	return &nhi->fib_nhc;
}
#endif
Commit	Line	Data
ab84be7e DA	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/*
	3	* Generic nexthop implementation
	4	*
	5	* Copyright (c) 2017-19 Cumulus Networks
	6	* Copyright (c) 2017-19 David Ahern <dsa@cumulusnetworks.com>
	7	*/
	8
	9	#ifndef __LINUX_NEXTHOP_H
	10	#define __LINUX_NEXTHOP_H
	11
	12	#include <linux/netdevice.h>
8590ceed	13	#include <linux/notifier.h>
f88d8ea6	14	#include <linux/route.h>
ab84be7e DA	15	#include <linux/types.h>
ab84be7e DA	16	#include <net/ip_fib.h>
53010f99	17	#include <net/ip6_fib.h>
ab84be7e DA	18	#include <net/netlink.h>
	19
	20	#define NEXTHOP_VALID_USER_FLAGS RTNH_F_ONLINK
	21
	22	struct nexthop;
	23
	24	struct nh_config {
	25	u32 nh_id;
	26
	27	u8 nh_family;
	28	u8 nh_protocol;
	29	u8 nh_blackhole;
38428d68	30	u8 nh_fdb;
ab84be7e DA	31	u32 nh_flags;
	32
	33	int nh_ifindex;
	34	struct net_device *dev;
	35
597cfe4f DA	36	union {
597cfe4f DA	37	__be32 ipv4;
53010f99	38	struct in6_addr ipv6;
597cfe4f DA	39	} gw;
597cfe4f DA	40
430a0491 DA	41	struct nlattr *nh_grp;
	42	u16 nh_grp_type;
	43
b513bd03 DA	44	struct nlattr *nh_encap;
	45	u16 nh_encap_type;
	46
ab84be7e DA	47	u32 nlflags;
	48	struct nl_info nlinfo;
	49	};
	50
	51	struct nh_info {
	52	struct hlist_node dev_hash; /* entry on netns devhash */
	53	struct nexthop *nh_parent;
	54
	55	u8 family;
	56	bool reject_nh;
38428d68	57	bool fdb_nh;
ab84be7e DA	58
	59	union {
	60	struct fib_nh_common fib_nhc;
597cfe4f	61	struct fib_nh fib_nh;
53010f99	62	struct fib6_nh fib6_nh;
ab84be7e DA	63	};
	64	};
	65
430a0491 DA	66	struct nh_grp_entry {
	67	struct nexthop *nh;
	68	u8 weight;
	69	atomic_t upper_bound;
	70
	71	struct list_head nh_list;
	72	struct nexthop nh_parent; / nexthop of group with this entry */
	73	};
	74
	75	struct nh_group {
90f33bff	76	struct nh_group spare; / spare group for removals */
430a0491 DA	77	u16 num_nh;
430a0491 DA	78	bool mpath;
ce9ac056	79	bool fdb_nh;
430a0491	80	bool has_v4;
97a888c2	81	struct nh_grp_entry nh_entries[];
430a0491 DA	82	};
430a0491 DA	83
ab84be7e DA	84	struct nexthop {
ab84be7e DA	85	struct rb_node rb_node; /* entry on netns rbtree */
4c7e8084	86	struct list_head fi_list; /* v4 entries using nh */
f88d8ea6	87	struct list_head f6i_list; /* v6 entries using nh */
38428d68	88	struct list_head fdb_list; /* fdb entries using this nh */
430a0491	89	struct list_head grp_list; /* nh group entries using this nh */
ab84be7e DA	90	struct net *net;
	91
	92	u32 id;
	93
	94	u8 protocol; /* app managing this nh */
	95	u8 nh_flags;
430a0491	96	bool is_group;
ab84be7e DA	97
	98	refcount_t refcnt;
	99	struct rcu_head rcu;
	100
	101	union {
	102	struct nh_info __rcu *nh_info;
430a0491	103	struct nh_group __rcu *nh_grp;
ab84be7e DA	104	};
	105	};
	106
8590ceed	107	enum nexthop_event_type {
732d167b IS	108	NEXTHOP_EVENT_DEL,
732d167b IS	109	NEXTHOP_EVENT_REPLACE,
8590ceed RP	110	};
8590ceed RP	111
1c9cac65 IS	112	struct nh_notifier_single_info {
	113	struct net_device *dev;
	114	u8 gw_family;
	115	union {
	116	__be32 ipv4;
	117	struct in6_addr ipv6;
	118	};
	119	u8 is_reject:1,
	120	is_fdb:1,
	121	has_encap:1;
	122	};
	123
	124	struct nh_notifier_grp_entry_info {
	125	u8 weight;
	126	u32 id;
	127	struct nh_notifier_single_info nh;
	128	};
	129
	130	struct nh_notifier_grp_info {
	131	u16 num_nh;
	132	bool is_fdb;
	133	struct nh_notifier_grp_entry_info nh_entries[];
	134	};
	135
	136	struct nh_notifier_info {
	137	struct net *net;
	138	struct netlink_ext_ack *extack;
	139	u32 id;
	140	bool is_grp;
	141	union {
	142	struct nh_notifier_single_info *nh;
	143	struct nh_notifier_grp_info *nh_grp;
	144	};
	145	};
	146
ce7e9c8a IS	147	int register_nexthop_notifier(struct net net, struct notifier_block nb,
ce7e9c8a IS	148	struct netlink_ext_ack *extack);
8590ceed	149	int unregister_nexthop_notifier(struct net net, struct notifier_block nb);
e95f2592	150	void nexthop_set_hw_flags(struct net *net, u32 id, bool offload, bool trap);
8590ceed	151
ab84be7e DA	152	/* caller is holding rcu or rtnl; no reference taken to nexthop */
	153	struct nexthop nexthop_find_by_id(struct net net, u32 id);
	154	void nexthop_free_rcu(struct rcu_head *head);
	155
	156	static inline bool nexthop_get(struct nexthop *nh)
	157	{
	158	return refcount_inc_not_zero(&nh->refcnt);
	159	}
	160
	161	static inline void nexthop_put(struct nexthop *nh)
	162	{
	163	if (refcount_dec_and_test(&nh->refcnt))
	164	call_rcu(&nh->rcu, nexthop_free_rcu);
	165	}
	166
4c7e8084 DA	167	static inline bool nexthop_cmp(const struct nexthop *nh1,
	168	const struct nexthop *nh2)
	169	{
	170	return nh1 == nh2;
ce9ac056 DA	171	}
	172
	173	static inline bool nexthop_is_fdb(const struct nexthop *nh)
	174	{
	175	if (nh->is_group) {
	176	const struct nh_group *nh_grp;
	177
	178	nh_grp = rcu_dereference_rtnl(nh->nh_grp);
	179	return nh_grp->fdb_nh;
	180	} else {
	181	const struct nh_info *nhi;
	182
	183	nhi = rcu_dereference_rtnl(nh->nh_info);
	184	return nhi->fdb_nh;
	185	}
50cb8769 DA	186	}
	187
	188	static inline bool nexthop_has_v4(const struct nexthop *nh)
	189	{
	190	if (nh->is_group) {
	191	struct nh_group *nh_grp;
	192
	193	nh_grp = rcu_dereference_rtnl(nh->nh_grp);
	194	return nh_grp->has_v4;
	195	}
	196	return false;
4c7e8084 DA	197	}
4c7e8084 DA	198
430a0491 DA	199	static inline bool nexthop_is_multipath(const struct nexthop *nh)
	200	{
	201	if (nh->is_group) {
	202	struct nh_group *nh_grp;
	203
	204	nh_grp = rcu_dereference_rtnl(nh->nh_grp);
	205	return nh_grp->mpath;
	206	}
	207	return false;
	208	}
	209
	210	struct nexthop nexthop_select_path(struct nexthop nh, int hash);
	211
	212	static inline unsigned int nexthop_num_path(const struct nexthop *nh)
	213	{
	214	unsigned int rc = 1;
	215
0b5e2e39	216	if (nh->is_group) {
430a0491 DA	217	struct nh_group *nh_grp;
	218
	219	nh_grp = rcu_dereference_rtnl(nh->nh_grp);
0b5e2e39 DA	220	if (nh_grp->mpath)
0b5e2e39 DA	221	rc = nh_grp->num_nh;
430a0491 DA	222	}
	223
	224	return rc;
	225	}
	226
	227	static inline
0b5e2e39	228	struct nexthop nexthop_mpath_select(const struct nh_group nhg, int nhsel)
430a0491	229	{
430a0491 DA	230	/* for_nexthops macros in fib_semantics.c grabs a pointer to
	231	* the nexthop before checking nhsel
	232	*/
5270041d	233	if (nhsel >= nhg->num_nh)
430a0491 DA	234	return NULL;
	235
	236	return nhg->nh_entries[nhsel].nh;
	237	}
	238
	239	static inline
7bdf4de1 DS	240	int nexthop_mpath_fill_node(struct sk_buff skb, struct nexthop nh,
7bdf4de1 DS	241	u8 rt_family)
430a0491 DA	242	{
	243	struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
	244	int i;
	245
	246	for (i = 0; i < nhg->num_nh; i++) {
	247	struct nexthop *nhe = nhg->nh_entries[i].nh;
	248	struct nh_info *nhi = rcu_dereference_rtnl(nhe->nh_info);
	249	struct fib_nh_common *nhc = &nhi->fib_nhc;
	250	int weight = nhg->nh_entries[i].weight;
	251
7bdf4de1	252	if (fib_add_nexthop(skb, nhc, weight, rt_family) < 0)
430a0491 DA	253	return -EMSGSIZE;
	254	}
	255
	256	return 0;
	257	}
	258
ab84be7e DA	259	/* called with rcu lock */
	260	static inline bool nexthop_is_blackhole(const struct nexthop *nh)
	261	{
	262	const struct nh_info *nhi;
	263
0b5e2e39 DA	264	if (nh->is_group) {
	265	struct nh_group *nh_grp;
	266
	267	nh_grp = rcu_dereference_rtnl(nh->nh_grp);
	268	if (nh_grp->num_nh > 1)
430a0491	269	return false;
0b5e2e39 DA	270
0b5e2e39 DA	271	nh = nh_grp->nh_entries[0].nh;
430a0491 DA	272	}
	273
	274	nhi = rcu_dereference_rtnl(nh->nh_info);
ab84be7e DA	275	return nhi->reject_nh;
ab84be7e DA	276	}
5481d73f	277
4c7e8084 DA	278	static inline void nexthop_path_fib_result(struct fib_result *res, int hash)
	279	{
	280	struct nh_info *nhi;
	281	struct nexthop *nh;
	282
	283	nh = nexthop_select_path(res->fi->nh, hash);
	284	nhi = rcu_dereference(nh->nh_info);
	285	res->nhc = &nhi->fib_nhc;
	286	}
	287
	288	/* called with rcu read lock or rtnl held */
	289	static inline
	290	struct fib_nh_common nexthop_fib_nhc(struct nexthop nh, int nhsel)
	291	{
	292	struct nh_info *nhi;
	293
	294	BUILD_BUG_ON(offsetof(struct fib_nh, nh_common) != 0);
	295	BUILD_BUG_ON(offsetof(struct fib6_nh, nh_common) != 0);
	296
0b5e2e39 DA	297	if (nh->is_group) {
	298	struct nh_group *nh_grp;
	299
	300	nh_grp = rcu_dereference_rtnl(nh->nh_grp);
	301	if (nh_grp->mpath) {
	302	nh = nexthop_mpath_select(nh_grp, nhsel);
	303	if (!nh)
	304	return NULL;
	305	}
4c7e8084 DA	306	}
	307
	308	nhi = rcu_dereference_rtnl(nh->nh_info);
	309	return &nhi->fib_nhc;
	310	}
	311
af7888ad DA	312	/* called from fib_table_lookup with rcu_lock */
	313	static inline
	314	struct fib_nh_common nexthop_get_nhc_lookup(const struct nexthop nh,
	315	int fib_flags,
	316	const struct flowi4 *flp,
	317	int *nhsel)
	318	{
	319	struct nh_info *nhi;
	320
	321	if (nh->is_group) {
	322	struct nh_group *nhg = rcu_dereference(nh->nh_grp);
	323	int i;
	324
	325	for (i = 0; i < nhg->num_nh; i++) {
	326	struct nexthop *nhe = nhg->nh_entries[i].nh;
	327
	328	nhi = rcu_dereference(nhe->nh_info);
	329	if (fib_lookup_good_nhc(&nhi->fib_nhc, fib_flags, flp)) {
	330	*nhsel = i;
	331	return &nhi->fib_nhc;
	332	}
	333	}
	334	} else {
	335	nhi = rcu_dereference(nh->nh_info);
	336	if (fib_lookup_good_nhc(&nhi->fib_nhc, fib_flags, flp)) {
	337	*nhsel = 0;
	338	return &nhi->fib_nhc;
	339	}
	340	}
	341
	342	return NULL;
	343	}
	344
1fd1c768 DA	345	static inline bool nexthop_uses_dev(const struct nexthop *nh,
	346	const struct net_device *dev)
	347	{
	348	struct nh_info *nhi;
	349
	350	if (nh->is_group) {
	351	struct nh_group *nhg = rcu_dereference(nh->nh_grp);
	352	int i;
	353
	354	for (i = 0; i < nhg->num_nh; i++) {
	355	struct nexthop *nhe = nhg->nh_entries[i].nh;
	356
	357	nhi = rcu_dereference(nhe->nh_info);
	358	if (nhc_l3mdev_matches_dev(&nhi->fib_nhc, dev))
	359	return true;
	360	}
	361	} else {
	362	nhi = rcu_dereference(nh->nh_info);
	363	if (nhc_l3mdev_matches_dev(&nhi->fib_nhc, dev))
	364	return true;
	365	}
	366
	367	return false;
	368	}
	369
5481d73f DA	370	static inline unsigned int fib_info_num_path(const struct fib_info *fi)
5481d73f DA	371	{
4c7e8084 DA	372	if (unlikely(fi->nh))
	373	return nexthop_num_path(fi->nh);
	374
5481d73f DA	375	return fi->fib_nhs;
	376	}
	377
4c7e8084 DA	378	int fib_check_nexthop(struct nexthop *nh, u8 scope,
	379	struct netlink_ext_ack *extack);
	380
5481d73f DA	381	static inline struct fib_nh_common fib_info_nhc(struct fib_info fi, int nhsel)
5481d73f DA	382	{
4c7e8084 DA	383	if (unlikely(fi->nh))
	384	return nexthop_fib_nhc(fi->nh, nhsel);
	385
5481d73f DA	386	return &fi->fib_nh[nhsel].nh_common;
	387	}
	388
4c7e8084	389	/* only used when fib_nh is built into fib_info */
5481d73f DA	390	static inline struct fib_nh fib_info_nh(struct fib_info fi, int nhsel)
5481d73f DA	391	{
4c7e8084 DA	392	WARN_ON(fi->nh);
4c7e8084 DA	393
5481d73f DA	394	return &fi->fib_nh[nhsel];
5481d73f DA	395	}
f88d8ea6 DA	396
	397	/*
	398	* IPv6 variants
	399	*/
	400	int fib6_check_nexthop(struct nexthop nh, struct fib6_config cfg,
	401	struct netlink_ext_ack *extack);
	402
	403	static inline struct fib6_nh nexthop_fib6_nh(struct nexthop nh)
	404	{
	405	struct nh_info *nhi;
	406
0b5e2e39 DA	407	if (nh->is_group) {
	408	struct nh_group *nh_grp;
	409
	410	nh_grp = rcu_dereference_rtnl(nh->nh_grp);
	411	nh = nexthop_mpath_select(nh_grp, 0);
f88d8ea6 DA	412	if (!nh)
	413	return NULL;
	414	}
	415
	416	nhi = rcu_dereference_rtnl(nh->nh_info);
	417	if (nhi->family == AF_INET6)
	418	return &nhi->fib6_nh;
	419
	420	return NULL;
	421	}
	422
	423	static inline struct net_device fib6_info_nh_dev(struct fib6_info f6i)
	424	{
	425	struct fib6_nh *fib6_nh;
	426
	427	fib6_nh = f6i->nh ? nexthop_fib6_nh(f6i->nh) : f6i->fib6_nh;
	428	return fib6_nh->fib_nh_dev;
	429	}
	430
	431	static inline void nexthop_path_fib6_result(struct fib6_result *res, int hash)
	432	{
	433	struct nexthop *nh = res->f6i->nh;
	434	struct nh_info *nhi;
	435
	436	nh = nexthop_select_path(nh, hash);
	437
	438	nhi = rcu_dereference_rtnl(nh->nh_info);
	439	if (nhi->reject_nh) {
	440	res->fib6_type = RTN_BLACKHOLE;
	441	res->fib6_flags \|= RTF_REJECT;
	442	res->nh = nexthop_fib6_nh(nh);
	443	} else {
	444	res->nh = &nhi->fib6_nh;
	445	}
	446	}
f88c9aa1 DA	447
	448	int nexthop_for_each_fib6_nh(struct nexthop *nh,
	449	int (cb)(struct fib6_nh nh, void *arg),
	450	void *arg);
38428d68 RP	451
	452	static inline int nexthop_get_family(struct nexthop *nh)
	453	{
	454	struct nh_info *nhi = rcu_dereference_rtnl(nh->nh_info);
	455
	456	return nhi->family;
	457	}
	458
	459	static inline
	460	struct fib_nh_common nexthop_fdb_nhc(struct nexthop nh)
	461	{
	462	struct nh_info *nhi = rcu_dereference_rtnl(nh->nh_info);
	463
	464	return &nhi->fib_nhc;
	465	}
	466
	467	static inline struct fib_nh_common nexthop_path_fdb_result(struct nexthop nh,
	468	int hash)
	469	{
	470	struct nh_info *nhi;
	471	struct nexthop *nhp;
	472
	473	nhp = nexthop_select_path(nh, hash);
	474	if (unlikely(!nhp))
	475	return NULL;
	476	nhi = rcu_dereference(nhp->nh_info);
	477	return &nhi->fib_nhc;
	478	}
ab84be7e	479	#endif