Commit dcb18f76 authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

ipv6: fib_rules: Dump rules during registration to FIB chain 



Allow users of the FIB notification chain to receive a complete view of
the IPv6 FIB rules upon registration to the chain.

The integrity of the dump is ensured by a per-family sequence counter
that is incremented (under RTNL) whenever a rule is added or deleted.

All the sequence counters are read (under RTNL) and summed, prior and
after the dump. In case the counters differ, then the dump is either
restarted or the registration fails.

Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent df77fe4d

include/net/ip6_fib.h

+10 −0
Original line number Original line Diff line number Diff line
@@ -312,6 +312,8 @@ void __net_exit fib6_notifier_exit(struct net *net); 
int fib6_rules_init(void);

int fib6_rules_init(void);

void fib6_rules_cleanup(void);

void fib6_rules_cleanup(void);

bool fib6_rule_default(const struct fib_rule *rule);

bool fib6_rule_default(const struct fib_rule *rule);

int fib6_rules_dump(struct net *net, struct notifier_block *nb);

unsigned int fib6_rules_seq_read(struct net *net);

#else

#else

static inline int               fib6_rules_init(void)

static inline int               fib6_rules_init(void)

{

{
@@ -325,5 +327,13 @@ static inline bool fib6_rule_default(const struct fib_rule *rule) 
{

{

	return true;

	return true;

}

}

static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb)

{

	return 0;

}

static inline unsigned int fib6_rules_seq_read(struct net *net)

{

	return 0;

}

#endif

#endif

#endif
 
#endif

net/ipv6/fib6_notifier.c

+2 −2
Original line number Original line Diff line number Diff line
@@ -23,12 +23,12 @@ int call_fib6_notifiers(struct net *net, enum fib_event_type event_type, 




static unsigned int fib6_seq_read(struct net *net)

static unsigned int fib6_seq_read(struct net *net)

{

{

	return 0;

	return fib6_rules_seq_read(net);

}

}





static int fib6_dump(struct net *net, struct notifier_block *nb)

static int fib6_dump(struct net *net, struct notifier_block *nb)

{

{

	return 0;

	return fib6_rules_dump(net, nb);

}

}





static const struct fib_notifier_ops fib6_notifier_ops_template = {

static const struct fib_notifier_ops fib6_notifier_ops_template = {

net/ipv6/fib6_rules.c

+11 −0
Original line number Original line Diff line number Diff line
@@ -14,6 +14,7 @@ 
 */

 */





#include <linux/netdevice.h>

#include <linux/netdevice.h>

#include <linux/notifier.h>

#include <linux/export.h>

#include <linux/export.h>





#include <net/fib_rules.h>

#include <net/fib_rules.h>
@@ -49,6 +50,16 @@ bool fib6_rule_default(const struct fib_rule *rule) 
}

}

EXPORT_SYMBOL_GPL(fib6_rule_default);

EXPORT_SYMBOL_GPL(fib6_rule_default);





int fib6_rules_dump(struct net *net, struct notifier_block *nb)

{

	return fib_rules_dump(net, nb, AF_INET6);

}



unsigned int fib6_rules_seq_read(struct net *net)

{

	return fib_rules_seq_read(net, AF_INET6);

}



struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,

struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,

				   int flags, pol_lookup_t lookup)

				   int flags, pol_lookup_t lookup)

{

{

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