net: mroute: Check if rule is a default rule (478e4c2f) · Commits · 戴 / test

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:

Yotam Gigi <yotamg@mellanox.com> Reviewed-by:

Ido Schimmel <idosch@mellanox.com> Signed-off-by:

Jiri Pirko <jiri@mellanox.com> Reviewed-by:

Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

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,

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