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ipv4: fib: Move FIB notification code to a separate file 

Most of the code concerned with the FIB notification chain currently
resides in fib_trie.c, but this isn't really appropriate, as the FIB
notification chain is also used for FIB rules.

Therefore, it makes sense to move the common FIB notification code to a
separate file and have it export the relevant functions, which can be
invoked by its different users (e.g., fib_trie.c, fib_rules.c).

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2017-03-10 08:56:18 +01:00 committed by David S. Miller
parent 71e8727ebe
commit c0243892cb
5 changed files with 113 additions and 96 deletions
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15
include/net/ip_fib.h
View File

@ -232,9 +232,24 @@ enum fib_event_type {
int register_fib_notifier(struct notifier_block *nb,
void (*cb)(struct notifier_block *nb));
int unregister_fib_notifier(struct notifier_block *nb);
int call_fib_notifier(struct notifier_block *nb, struct net *net,
enum fib_event_type event_type,
struct fib_notifier_info *info);
int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
struct fib_notifier_info *info);
void fib_notify(struct net *net, struct notifier_block *nb,
enum fib_event_type event_type);
#ifdef CONFIG_IP_MULTIPLE_TABLES
void fib_rules_notify(struct net *net, struct notifier_block *nb,
enum fib_event_type event_type);
#else
static inline void fib_rules_notify(struct net *net, struct notifier_block *nb,
enum fib_event_type event_type)
{
}
#endif
struct fib_table {
struct hlist_node tb_hlist;
u32 tb_id;

2
net/ipv4/Makefile
View File

@ -11,7 +11,7 @@ obj-y := route.o inetpeer.o protocol.o \
tcp_rate.o tcp_recovery.o \
tcp_offload.o datagram.o raw.o udp.o udplite.o \
udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \
fib_frontend.o fib_semantics.o fib_trie.o \
fib_frontend.o fib_semantics.o fib_trie.o fib_notifier.o \
inet_fragment.o ping.o ip_tunnel_core.o gre_offload.o
obj-$(CONFIG_NET_IP_TUNNEL) += ip_tunnel.o

86
net/ipv4/fib_notifier.c Normal file
View File

@ -0,0 +1,86 @@
#include <linux/rtnetlink.h>
#include <linux/notifier.h>
#include <linux/rcupdate.h>
#include <linux/kernel.h>
#include <net/net_namespace.h>
#include <net/netns/ipv4.h>
#include <net/ip_fib.h>
static ATOMIC_NOTIFIER_HEAD(fib_chain);
int call_fib_notifier(struct notifier_block *nb, struct net *net,
enum fib_event_type event_type,
struct fib_notifier_info *info)
{
info->net = net;
return nb->notifier_call(nb, event_type, info);
}
int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
struct fib_notifier_info *info)
{
net->ipv4.fib_seq++;
info->net = net;
return atomic_notifier_call_chain(&fib_chain, event_type, info);
}
static unsigned int fib_seq_sum(void)
{
unsigned int fib_seq = 0;
struct net *net;
rtnl_lock();
for_each_net(net)
fib_seq += net->ipv4.fib_seq;
rtnl_unlock();
return fib_seq;
}
static bool fib_dump_is_consistent(struct notifier_block *nb,
void (*cb)(struct notifier_block *nb),
unsigned int fib_seq)
{
atomic_notifier_chain_register(&fib_chain, nb);
if (fib_seq == fib_seq_sum())
return true;
atomic_notifier_chain_unregister(&fib_chain, nb);
if (cb)
cb(nb);
return false;
}
#define FIB_DUMP_MAX_RETRIES 5
int register_fib_notifier(struct notifier_block *nb,
void (*cb)(struct notifier_block *nb))
{
int retries = 0;
do {
unsigned int fib_seq = fib_seq_sum();
struct net *net;
/* Mutex semantics guarantee that every change done to
* FIB tries before we read the change sequence counter
* is now visible to us.
*/
rcu_read_lock();
for_each_net_rcu(net) {
fib_rules_notify(net, nb, FIB_EVENT_RULE_ADD);
fib_notify(net, nb, FIB_EVENT_ENTRY_ADD);
}
rcu_read_unlock();
if (fib_dump_is_consistent(nb, cb, fib_seq))
return 0;
} while (++retries < FIB_DUMP_MAX_RETRIES);
return -EBUSY;
}
EXPORT_SYMBOL(register_fib_notifier);
int unregister_fib_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&fib_chain, nb);
}
EXPORT_SYMBOL(unregister_fib_notifier);

9
net/ipv4/fib_rules.c
View File

@ -172,6 +172,15 @@ static int call_fib_rule_notifiers(struct net *net,
return call_fib_notifiers(net, event_type, &info);
}
void fib_rules_notify(struct net *net, struct notifier_block *nb,
enum fib_event_type event_type)
{
struct fib_notifier_info info;
if (net->ipv4.fib_has_custom_rules)
call_fib_notifier(nb, net, event_type, &info);
}
static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
FRA_GENERIC_POLICY,
[FRA_FLOW] = { .type = NLA_U32 },

97
net/ipv4/fib_trie.c
View File

@ -84,43 +84,6 @@
#include <trace/events/fib.h>
#include "fib_lookup.h"
static unsigned int fib_seq_sum(void)
{
unsigned int fib_seq = 0;
struct net *net;
rtnl_lock();
for_each_net(net)
fib_seq += net->ipv4.fib_seq;
rtnl_unlock();
return fib_seq;
}
static ATOMIC_NOTIFIER_HEAD(fib_chain);
static int call_fib_notifier(struct notifier_block *nb, struct net *net,
enum fib_event_type event_type,
struct fib_notifier_info *info)
{
info->net = net;
return nb->notifier_call(nb, event_type, info);
}
static void fib_rules_notify(struct net *net, struct notifier_block *nb,
enum fib_event_type event_type)
{
#ifdef CONFIG_IP_MULTIPLE_TABLES
struct fib_notifier_info info;
if (net->ipv4.fib_has_custom_rules)
call_fib_notifier(nb, net, event_type, &info);
#endif
}
static void fib_notify(struct net *net, struct notifier_block *nb,
enum fib_event_type event_type);
static int call_fib_entry_notifier(struct notifier_block *nb, struct net *net,
enum fib_event_type event_type, u32 dst,
int dst_len, struct fib_info *fi,
@ -137,62 +100,6 @@ static int call_fib_entry_notifier(struct notifier_block *nb, struct net *net,
return call_fib_notifier(nb, net, event_type, &info.info);
}
static bool fib_dump_is_consistent(struct notifier_block *nb,
void (*cb)(struct notifier_block *nb),
unsigned int fib_seq)
{
atomic_notifier_chain_register(&fib_chain, nb);
if (fib_seq == fib_seq_sum())
return true;
atomic_notifier_chain_unregister(&fib_chain, nb);
if (cb)
cb(nb);
return false;
}
#define FIB_DUMP_MAX_RETRIES 5
int register_fib_notifier(struct notifier_block *nb,
void (*cb)(struct notifier_block *nb))
{
int retries = 0;
do {
unsigned int fib_seq = fib_seq_sum();
struct net *net;
/* Mutex semantics guarantee that every change done to
* FIB tries before we read the change sequence counter
* is now visible to us.
*/
rcu_read_lock();
for_each_net_rcu(net) {
fib_rules_notify(net, nb, FIB_EVENT_RULE_ADD);
fib_notify(net, nb, FIB_EVENT_ENTRY_ADD);
}
rcu_read_unlock();
if (fib_dump_is_consistent(nb, cb, fib_seq))
return 0;
} while (++retries < FIB_DUMP_MAX_RETRIES);
return -EBUSY;
}
EXPORT_SYMBOL(register_fib_notifier);
int unregister_fib_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&fib_chain, nb);
}
EXPORT_SYMBOL(unregister_fib_notifier);
int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
struct fib_notifier_info *info)
{
net->ipv4.fib_seq++;
info->net = net;
return atomic_notifier_call_chain(&fib_chain, event_type, info);
}
static int call_fib_entry_notifiers(struct net *net,
enum fib_event_type event_type, u32 dst,
int dst_len, struct fib_info *fi,
@ -2036,8 +1943,8 @@ static void fib_table_notify(struct net *net, struct fib_table *tb,
}
}
static void fib_notify(struct net *net, struct notifier_block *nb,
enum fib_event_type event_type)
void fib_notify(struct net *net, struct notifier_block *nb,
enum fib_event_type event_type)
{
unsigned int h;