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Commit 478e4c2f authored by Yotam Gigi's avatar Yotam Gigi Committed by David S. Miller
Browse files

net: mroute: Check if rule is a default rule 



When the ipmr starts, it adds one default FIB rule that matches all packets
and sends them to the DEFAULT (multicast) FIB table. A more complex rule
can be added by user to specify that for a specific interface, a packet
should be look up at either an arbitrary table or according to the l3mdev
of the interface.

For drivers willing to offload the ipmr logic into a hardware but don't
want to offload all the FIB rules functionality, provide a function that
can indicate whether the FIB rule is the default multicast rule, thus only
one routing table is needed.

This way, a driver can register to the FIB notification chain, get
notifications about FIB rules added and trigger some kind of an internal
abort mechanism when a non default rule is added by the user.

Signed-off-by: default avatarYotam Gigi <yotamg@mellanox.com>
Reviewed-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
Reviewed-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c7c0bbea

include/linux/mroute.h

+7 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
#include <linux/pim.h>

#include <linux/rhashtable.h>

#include <net/sock.h>

#include <net/fib_rules.h>

#include <net/fib_notifier.h>

#include <uapi/linux/mroute.h>
@@ -19,6 +20,7 @@ int ip_mroute_getsockopt(struct sock *, int, char __user *, int __user *); 
int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg);

int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg);

int ip_mr_init(void);

bool ipmr_rule_default(const struct fib_rule *rule);

#else

static inline int ip_mroute_setsockopt(struct sock *sock, int optname,

				       char __user *optval, unsigned int optlen)
@@ -46,6 +48,11 @@ static inline int ip_mroute_opt(int opt) 
{

	return 0;

}



static inline bool ipmr_rule_default(const struct fib_rule *rule)

{

	return true;

}

#endif



struct vif_device {

net/ipv4/ipmr.c

+12 −0
Original line number Diff line number Diff line
@@ -274,6 +274,12 @@ static unsigned int ipmr_rules_seq_read(struct net *net) 
{

	return fib_rules_seq_read(net, RTNL_FAMILY_IPMR);

}



bool ipmr_rule_default(const struct fib_rule *rule)

{

	return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT;

}

EXPORT_SYMBOL(ipmr_rule_default);

#else

#define ipmr_for_each_table(mrt, net) \

	for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
@@ -318,6 +324,12 @@ static unsigned int ipmr_rules_seq_read(struct net *net) 
{

	return 0;

}



bool ipmr_rule_default(const struct fib_rule *rule)

{

	return true;

}

EXPORT_SYMBOL(ipmr_rule_default);

#endif



static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg,