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ipv6: fib: Add FIB notifiers callbacks

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We're about to add IPv6 FIB offload support, so implement the necessary
callbacks in IPv6 code, which will later allow us to add routes and
rules notifications.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2017-08-03 13:28:16 +02:00 committed by David S. Miller
parent e3ea973159
commit 16ab6d7d4d
5 changed files with 75 additions and 1 deletions
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11
include/net/ip6_fib.h
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@ -16,10 +16,12 @@
#include <linux/ipv6_route.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>
#include <linux/notifier.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/netlink.h>
#include <net/inetpeer.h>
#include <net/fib_notifier.h>
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
#define FIB6_TABLE_HASHSZ 256
@ -292,6 +294,15 @@ int fib6_init(void);
int ipv6_route_open(struct inode *inode, struct file *file);
int call_fib6_notifier(struct notifier_block *nb, struct net *net,
enum fib_event_type event_type,
struct fib_notifier_info *info);
int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
struct fib_notifier_info *info);
int __net_init fib6_notifier_init(struct net *net);
void __net_exit fib6_notifier_exit(struct net *net);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
int fib6_rules_init(void);
void fib6_rules_cleanup(void);

1
include/net/netns/ipv6.h
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@ -86,6 +86,7 @@ struct netns_ipv6 {
atomic_t dev_addr_genid;
atomic_t fib6_sernum;
struct seg6_pernet_data *seg6_data;
struct fib_notifier_ops *notifier_ops;
};
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)

2
net/ipv6/Makefile
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@ -9,7 +9,7 @@ ipv6-objs := af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \
route.o ip6_fib.o ipv6_sockglue.o ndisc.o udp.o udplite.o \
raw.o icmp.o mcast.o reassembly.o tcp_ipv6.o ping.o \
exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o \
udp_offload.o seg6.o
udp_offload.o seg6.o fib6_notifier.o
ipv6-offload := ip6_offload.o tcpv6_offload.o exthdrs_offload.o

55
net/ipv6/fib6_notifier.c Normal file
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@ -0,0 +1,55 @@
#include <linux/notifier.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <net/net_namespace.h>
#include <net/fib_notifier.h>
#include <net/netns/ipv6.h>
#include <net/ip6_fib.h>
int call_fib6_notifier(struct notifier_block *nb, struct net *net,
enum fib_event_type event_type,
struct fib_notifier_info *info)
{
info->family = AF_INET6;
return call_fib_notifier(nb, net, event_type, info);
}
int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
struct fib_notifier_info *info)
{
info->family = AF_INET6;
return call_fib_notifiers(net, event_type, info);
}
static unsigned int fib6_seq_read(struct net *net)
{
return 0;
}
static int fib6_dump(struct net *net, struct notifier_block *nb)
{
return 0;
}
static const struct fib_notifier_ops fib6_notifier_ops_template = {
.family = AF_INET6,
.fib_seq_read = fib6_seq_read,
.fib_dump = fib6_dump,
};
int __net_init fib6_notifier_init(struct net *net)
{
struct fib_notifier_ops *ops;
ops = fib_notifier_ops_register(&fib6_notifier_ops_template, net);
if (IS_ERR(ops))
return PTR_ERR(ops);
net->ipv6.notifier_ops = ops;
return 0;
}
void __net_exit fib6_notifier_exit(struct net *net)
{
fib_notifier_ops_unregister(net->ipv6.notifier_ops);
}

7
net/ipv6/ip6_fib.c
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@ -1839,6 +1839,11 @@ static void fib6_gc_timer_cb(unsigned long arg)
static int __net_init fib6_net_init(struct net *net)
{
size_t size = sizeof(struct hlist_head) * FIB6_TABLE_HASHSZ;
int err;
err = fib6_notifier_init(net);
if (err)
return err;
spin_lock_init(&net->ipv6.fib6_gc_lock);
rwlock_init(&net->ipv6.fib6_walker_lock);
@ -1891,6 +1896,7 @@ out_fib_table_hash:
out_rt6_stats:
kfree(net->ipv6.rt6_stats);
out_timer:
fib6_notifier_exit(net);
return -ENOMEM;
}
@ -1907,6 +1913,7 @@ static void fib6_net_exit(struct net *net)
kfree(net->ipv6.fib6_main_tbl);
kfree(net->ipv6.fib_table_hash);
kfree(net->ipv6.rt6_stats);
fib6_notifier_exit(net);
}
static struct pernet_operations fib6_net_ops = {