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nexthop: add support for notifiers

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This patch adds nexthop add/del notifiers. To be used by
vxlan driver in a later patch. Could possibly be used by
switchdev drivers in the future.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu 2020-05-21 22:26:15 -07:00 committed by David S. Miller
parent 1274e1cc42
commit 8590ceedb7
3 changed files with 40 additions and 0 deletions
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1
include/net/netns/nexthop.h
View file

@ -14,5 +14,6 @@ struct netns_nexthop {
unsigned int seq; /* protected by rtnl_mutex */
u32 last_id_allocated;
struct atomic_notifier_head notifier_chain;
};
#endif

12
include/net/nexthop.h
View file

@ -10,6 +10,7 @@
#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>
@ -102,6 +103,17 @@ struct nexthop {
};
};
enum nexthop_event_type {
NEXTHOP_EVENT_ADD,
NEXTHOP_EVENT_DEL
};
int call_nexthop_notifier(struct notifier_block *nb, struct net *net,
enum nexthop_event_type event_type,
struct nexthop *nh);
int register_nexthop_notifier(struct net *net, struct notifier_block *nb);
int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb);
/* 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);

27
net/ipv4/nexthop.c
View file

@ -36,6 +36,17 @@ static const struct nla_policy rtm_nh_policy[NHA_MAX + 1] = {
[NHA_FDB] = { .type = NLA_FLAG },
};
static int call_nexthop_notifiers(struct net *net,
enum fib_event_type event_type,
struct nexthop *nh)
{
int err;
err = atomic_notifier_call_chain(&net->nexthop.notifier_chain,
event_type, nh);
return notifier_to_errno(err);
}
static unsigned int nh_dev_hashfn(unsigned int val)
{
unsigned int mask = NH_DEV_HASHSIZE - 1;
@ -826,6 +837,8 @@ static void __remove_nexthop_fib(struct net *net, struct nexthop *nh)
bool do_flush = false;
struct fib_info *fi;
call_nexthop_notifiers(net, NEXTHOP_EVENT_DEL, nh);
list_for_each_entry(fi, &nh->fi_list, nh_list) {
fi->fib_flags |= RTNH_F_DEAD;
do_flush = true;
@ -1865,6 +1878,19 @@ static struct notifier_block nh_netdev_notifier = {
.notifier_call = nh_netdev_event,
};
int register_nexthop_notifier(struct net *net, struct notifier_block *nb)
{
return atomic_notifier_chain_register(&net->nexthop.notifier_chain, nb);
}
EXPORT_SYMBOL(register_nexthop_notifier);
int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&net->nexthop.notifier_chain,
nb);
}
EXPORT_SYMBOL(unregister_nexthop_notifier);
static void __net_exit nexthop_net_exit(struct net *net)
{
rtnl_lock();
@ -1881,6 +1907,7 @@ static int __net_init nexthop_net_init(struct net *net)
net->nexthop.devhash = kzalloc(sz, GFP_KERNEL);
if (!net->nexthop.devhash)
return -ENOMEM;
ATOMIC_INIT_NOTIFIER_HEAD(&net->nexthop.notifier_chain);
return 0;
}