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Commit c0243892 authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

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: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
Acked-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 71e8727e

include/net/ip_fib.h

+15 −0
Original line number Diff line number Diff line
@@ -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;

net/ipv4/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

net/ipv4/fib_notifier.c

0 → 100644
+86 −0
Original line number Diff line number Diff line 
#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);

net/ipv4/fib_rules.c

+9 −0
Original line number Diff line number Diff line
@@ -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 },

net/ipv4/fib_trie.c

+2 −95
Original line number Diff line number Diff line
@@ -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,
@@ -2036,7 +1943,7 @@ static void fib_table_notify(struct net *net, struct fib_table *tb, 
	}

}



static void fib_notify(struct net *net, struct notifier_block *nb,

void fib_notify(struct net *net, struct notifier_block *nb,

		enum fib_event_type event_type)

{

	unsigned int h;