Commit f88c9aa1 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

nexthops: Add ipv6 helper to walk all fib6_nh in a nexthop struct 



IPv6 has traditionally had a single fib6_nh per fib6_info. With
nexthops we can have multiple fib6_nh associated with a fib6_info.
Add a nexthop helper to invoke a callback for each fib6_nh in a
'struct nexthop'. If the callback returns non-0, the loop is
stopped and the return value passed to the caller.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 948622f9

include/net/nexthop.h

+4 −0
Original line number Diff line number Diff line
@@ -305,4 +305,8 @@ static inline void nexthop_path_fib6_result(struct fib6_result *res, int hash) 
		res->nh = &nhi->fib6_nh;

	}

}



int nexthop_for_each_fib6_nh(struct nexthop *nh,

			     int (*cb)(struct fib6_nh *nh, void *arg),

			     void *arg);

#endif

net/ipv4/nexthop.c

+31 −0
Original line number Diff line number Diff line
@@ -517,6 +517,37 @@ struct nexthop *nexthop_select_path(struct nexthop *nh, int hash) 
}

EXPORT_SYMBOL_GPL(nexthop_select_path);



int nexthop_for_each_fib6_nh(struct nexthop *nh,

			     int (*cb)(struct fib6_nh *nh, void *arg),

			     void *arg)

{

	struct nh_info *nhi;

	int err;



	if (nh->is_group) {

		struct nh_group *nhg;

		int i;



		nhg = rcu_dereference_rtnl(nh->nh_grp);

		for (i = 0; i < nhg->num_nh; i++) {

			struct nh_grp_entry *nhge = &nhg->nh_entries[i];



			nhi = rcu_dereference_rtnl(nhge->nh->nh_info);

			err = cb(&nhi->fib6_nh, arg);

			if (err)

				return err;

		}

	} else {

		nhi = rcu_dereference_rtnl(nh->nh_info);

		err = cb(&nhi->fib6_nh, arg);

		if (err)

			return err;

	}



	return 0;

}

EXPORT_SYMBOL_GPL(nexthop_for_each_fib6_nh);



int fib6_check_nexthop(struct nexthop *nh, struct fib6_config *cfg,

		       struct netlink_ext_ack *extack)

{

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