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ipv4: Add fib_check_nh_v6_gw

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

Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-04-05 16:30:32 -07:00 committed by David S. Miller
parent 448d724819
commit 717a8f5b29
1 changed files with 27 additions and 0 deletions
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27
net/ipv4/fib_semantics.c
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@ -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);