89 lines
1.6 KiB
C
89 lines
1.6 KiB
C
![]() |
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Generic nexthop implementation
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*
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* Copyright (c) 2017-19 Cumulus Networks
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* Copyright (c) 2017-19 David Ahern <dsa@cumulusnetworks.com>
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*/
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#ifndef __LINUX_NEXTHOP_H
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#define __LINUX_NEXTHOP_H
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <net/ip_fib.h>
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#include <net/netlink.h>
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#define NEXTHOP_VALID_USER_FLAGS RTNH_F_ONLINK
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struct nexthop;
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struct nh_config {
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u32 nh_id;
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u8 nh_family;
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u8 nh_protocol;
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u8 nh_blackhole;
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u32 nh_flags;
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int nh_ifindex;
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struct net_device *dev;
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u32 nlflags;
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struct nl_info nlinfo;
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};
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struct nh_info {
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struct hlist_node dev_hash; /* entry on netns devhash */
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struct nexthop *nh_parent;
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u8 family;
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bool reject_nh;
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union {
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struct fib_nh_common fib_nhc;
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};
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};
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struct nexthop {
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struct rb_node rb_node; /* entry on netns rbtree */
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struct net *net;
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u32 id;
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u8 protocol; /* app managing this nh */
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u8 nh_flags;
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refcount_t refcnt;
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struct rcu_head rcu;
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union {
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struct nh_info __rcu *nh_info;
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};
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};
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/* caller is holding rcu or rtnl; no reference taken to nexthop */
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struct nexthop *nexthop_find_by_id(struct net *net, u32 id);
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void nexthop_free_rcu(struct rcu_head *head);
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static inline bool nexthop_get(struct nexthop *nh)
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{
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return refcount_inc_not_zero(&nh->refcnt);
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}
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static inline void nexthop_put(struct nexthop *nh)
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{
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if (refcount_dec_and_test(&nh->refcnt))
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call_rcu(&nh->rcu, nexthop_free_rcu);
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}
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/* called with rcu lock */
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static inline bool nexthop_is_blackhole(const struct nexthop *nh)
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{
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const struct nh_info *nhi;
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nhi = rcu_dereference(nh->nh_info);
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return nhi->reject_nh;
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}
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#endif
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