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/* 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/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;
u32 nh_flags;
int nh_ifindex;
struct net_device *dev;
union {
__be32 ipv4;
struct in6_addr ipv6;
} gw;
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;
union {
struct fib_nh_common fib_nhc;
struct fib_nh fib_nh;
struct fib6_nh fib6_nh;
};
};
struct nexthop {
struct rb_node rb_node; /* entry on netns rbtree */
struct net *net;
u32 id;
u8 protocol; /* app managing this nh */
u8 nh_flags;
refcount_t refcnt;
struct rcu_head rcu;
union {
struct nh_info __rcu *nh_info;
};
};
/* 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);
}
/* called with rcu lock */
static inline bool nexthop_is_blackhole(const struct nexthop *nh)
{
const struct nh_info *nhi;
nhi = rcu_dereference(nh->nh_info);
return nhi->reject_nh;
}
#endif
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