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ab84be7e54
Barebones start point for nexthops. Implementation for RTM commands, notifications, management of rbtree for holding nexthops by id, and kernel side data structures for nexthops and nexthop config. Nexthops are maintained in an rbtree sorted by id. Similar to routes, nexthops are configured per namespace using netns_nexthop struct added to struct net. Nexthop notifications are sent when a nexthop is added or deleted, but NOT if the delete is due to a device event or network namespace teardown (which also involves device events). Applications are expected to use the device down event to flush nexthops and any routes used by the nexthops. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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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