Commit 717a8f5b authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

ipv4: Add fib_check_nh_v6_gw 



Add helper to use fib6_nh_init to validate a nexthop spec with an IPv6
gateway.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Reviewed-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 448d7248

net/ipv4/fib_semantics.c

+27 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ 
#include <net/tcp.h>

#include <net/sock.h>

#include <net/ip_fib.h>

#include <net/ip6_fib.h>

#include <net/netlink.h>

#include <net/nexthop.h>

#include <net/lwtunnel.h>
@@ -841,6 +842,30 @@ bool fib_metrics_match(struct fib_config *cfg, struct fib_info *fi) 
	return true;

}



static int fib_check_nh_v6_gw(struct net *net, struct fib_nh *nh,

			      u32 table, struct netlink_ext_ack *extack)

{

	struct fib6_config cfg = {

		.fc_table = table,

		.fc_flags = nh->fib_nh_flags | RTF_GATEWAY,

		.fc_ifindex = nh->fib_nh_oif,

		.fc_gateway = nh->fib_nh_gw6,

	};

	struct fib6_nh fib6_nh = {};

	int err;



	err = ipv6_stub->fib6_nh_init(net, &fib6_nh, &cfg, GFP_KERNEL, extack);

	if (!err) {

		nh->fib_nh_dev = fib6_nh.fib_nh_dev;

		dev_hold(nh->fib_nh_dev);

		nh->fib_nh_oif = nh->fib_nh_dev->ifindex;

		nh->fib_nh_scope = RT_SCOPE_LINK;



		ipv6_stub->fib6_nh_release(&fib6_nh);

	}



	return err;

}



/*

 * Picture
@@ -1023,6 +1048,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_nh *nh, 


	if (nh->fib_nh_gw_family == AF_INET)

		err = fib_check_nh_v4_gw(net, nh, table, cfg->fc_scope, extack);

	else if (nh->fib_nh_gw_family == AF_INET6)

		err = fib_check_nh_v6_gw(net, nh, table, extack);

	else

		err = fib_check_nh_nongw(net, nh, extack);