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ipv4: Add support to rtable for ipv6 gateway

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Add support for an IPv6 gateway to rtable. Since a gateway is either
IPv4 or IPv6, make it a union with rt_gw4 where rt_gw_family decides
which address is in use.

When dumping the route data, encode an ipv6 nexthop using RTA_VIA.

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 16:30:29 -07:00 committed by David S. Miller
parent f35b794b3b
commit 0f5f7d7bf6
5 changed files with 38 additions and 8 deletions
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3
drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
View File

@ -318,6 +318,9 @@ mlxsw_sp_span_gretap4_route(const struct net_device *to_dev,
*saddrp = fl4.saddr;
if (rt->rt_gw_family == AF_INET)
*daddrp = rt->rt_gw4;
/* can not offload if route has an IPv6 gateway */
else if (rt->rt_gw_family == AF_INET6)
dev = NULL;
out:
ip_rt_put(rt);

5
include/net/route.h
View File

@ -60,7 +60,10 @@ struct rtable {
int rt_iif;
/* Info on neighbour */
__be32 rt_gw4;
union {
__be32 rt_gw4;
struct in6_addr rt_gw6;
};
/* Miscellaneous cached information */
u32 rt_mtu_locked:1,

31
net/ipv4/route.c
View File

@ -1535,14 +1535,20 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
if (fi) {
struct fib_nh_common *nhc = FIB_RES_NHC(*res);
struct fib_nh *nh = container_of(nhc, struct fib_nh, nh_common);
struct fib_nh *nh;
if (nh->fib_nh_gw4 && nh->fib_nh_scope == RT_SCOPE_LINK) {
rt->rt_gw4 = nh->fib_nh_gw4;
rt->rt_gw_family = AF_INET;
if (nhc->nhc_gw_family && nhc->nhc_scope == RT_SCOPE_LINK) {
rt->rt_gw_family = nhc->nhc_gw_family;
/* only INET and INET6 are supported */
if (likely(nhc->nhc_gw_family == AF_INET))
rt->rt_gw4 = nhc->nhc_gw.ipv4;
else
rt->rt_gw6 = nhc->nhc_gw.ipv6;
}
ip_dst_init_metrics(&rt->dst, fi->fib_metrics);
nh = container_of(nhc, struct fib_nh, nh_common);
#ifdef CONFIG_IP_ROUTE_CLASSID
rt->dst.tclassid = nh->nh_tclassid;
#endif
@ -2600,6 +2606,8 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
rt->rt_gw_family = ort->rt_gw_family;
if (rt->rt_gw_family == AF_INET)
rt->rt_gw4 = ort->rt_gw4;
else if (rt->rt_gw_family == AF_INET6)
rt->rt_gw6 = ort->rt_gw6;
INIT_LIST_HEAD(&rt->rt_uncached);
}
@ -2679,8 +2687,21 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
goto nla_put_failure;
}
if (rt->rt_gw_family == AF_INET &&
nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gw4))
nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gw4)) {
goto nla_put_failure;
} else if (rt->rt_gw_family == AF_INET6) {
int alen = sizeof(struct in6_addr);
struct nlattr *nla;
struct rtvia *via;
nla = nla_reserve(skb, RTA_VIA, alen + 2);
if (!nla)
goto nla_put_failure;
via = nla_data(nla);
via->rtvia_family = AF_INET6;
memcpy(via->rtvia_addr, &rt->rt_gw6, alen);
}
expires = rt->dst.expires;
if (expires) {

2
net/ipv4/xfrm4_policy.c
View File

@ -100,6 +100,8 @@ static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
xdst->u.rt.rt_gw_family = rt->rt_gw_family;
if (rt->rt_gw_family == AF_INET)
xdst->u.rt.rt_gw4 = rt->rt_gw4;
else if (rt->rt_gw_family == AF_INET6)
xdst->u.rt.rt_gw6 = rt->rt_gw6;
xdst->u.rt.rt_pmtu = rt->rt_pmtu;
xdst->u.rt.rt_mtu_locked = rt->rt_mtu_locked;
INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);

5
net/mpls/mpls_iptunnel.c
View File

@ -141,8 +141,9 @@ static int mpls_xmit(struct sk_buff *skb)
if (rt->rt_gw_family == AF_INET)
err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt->rt_gw4,
skb);
else
err = -EAFNOSUPPORT;
else if (rt->rt_gw_family == AF_INET6)
err = neigh_xmit(NEIGH_ND_TABLE, out_dev, &rt->rt_gw6,
skb);
} else if (rt6) {
if (ipv6_addr_v4mapped(&rt6->rt6i_gateway)) {
/* 6PE (RFC 4798) */