Commit 1550c171 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

ipv4: Prepare rtable for IPv6 gateway



To allow the gateway to be either an IPv4 or IPv6 address, remove
rt_uses_gateway from rtable and replace with rt_gw_family. If
rt_gw_family is set it implies rt_uses_gateway. Rename rt_gateway
to rt_gw4 to represent the IPv4 version.

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 bdf00467
......@@ -351,7 +351,7 @@ static bool has_gateway(const struct dst_entry *dst, sa_family_t family)
if (family == AF_INET) {
rt = container_of(dst, struct rtable, dst);
return rt->rt_uses_gateway;
return rt->rt_gw_family == AF_INET;
}
rt6 = container_of(dst, struct rt6_info, dst);
......
......@@ -1407,7 +1407,7 @@ static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpi
if (neigh->nud_state & NUD_VALID) {
nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
" is %pM, Gateway is 0x%08X \n", dst_ip,
neigh->ha, ntohl(rt->rt_gateway));
neigh->ha, ntohl(rt->rt_gw4));
if (arpindex >= 0) {
if (ether_addr_equal(nesadapter->arp_table[arpindex].mac_addr, neigh->ha)) {
......
......@@ -116,11 +116,15 @@ static struct net_device * __init ipddp_init(void)
*/
static netdev_tx_t ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
{
__be32 paddr = skb_rtable(skb)->rt_gateway;
struct rtable *rtable = skb_rtable(skb);
__be32 paddr = 0;
struct ddpehdr *ddp;
struct ipddp_route *rt;
struct atalk_addr *our_addr;
if (rtable->rt_gw_family == AF_INET)
paddr = rtable->rt_gw4;
spin_lock(&ipddp_route_lock);
/*
......
......@@ -70,7 +70,7 @@ static int mlx5e_route_lookup_ipv4(struct mlx5e_priv *priv,
if (ret)
return ret;
if (mlx5_lag_is_multipath(mdev) && !rt->rt_gateway)
if (mlx5_lag_is_multipath(mdev) && rt->rt_gw_family != AF_INET)
return -ENETUNREACH;
#else
return -EOPNOTSUPP;
......
......@@ -316,7 +316,8 @@ mlxsw_sp_span_gretap4_route(const struct net_device *to_dev,
dev = rt->dst.dev;
*saddrp = fl4.saddr;
*daddrp = rt->rt_gateway;
if (rt->rt_gw_family == AF_INET)
*daddrp = rt->rt_gw4;
out:
ip_rt_put(rt);
......
......@@ -55,12 +55,12 @@ struct rtable {
unsigned int rt_flags;
__u16 rt_type;
__u8 rt_is_input;
__u8 rt_uses_gateway;
u8 rt_gw_family;
int rt_iif;
/* Info on neighbour */
__be32 rt_gateway;
__be32 rt_gw4;
/* Miscellaneous cached information */
u32 rt_mtu_locked:1,
......@@ -82,8 +82,8 @@ static inline bool rt_is_output_route(const struct rtable *rt)
static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
{
if (rt->rt_gateway)
return rt->rt_gateway;
if (rt->rt_gw_family == AF_INET)
return rt->rt_gw4;
return daddr;
}
......
......@@ -345,8 +345,8 @@ static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
return NETDEV_TX_OK;
}
rt = (struct rtable *) dst;
if (rt->rt_gateway)
daddr = &rt->rt_gateway;
if (rt->rt_gw_family == AF_INET)
daddr = &rt->rt_gw4;
else
daddr = &ip_hdr(skb)->daddr;
n = dst_neigh_lookup(dst, daddr);
......
......@@ -564,7 +564,7 @@ struct dst_entry *inet_csk_route_req(const struct sock *sk,
rt = ip_route_output_flow(net, fl4, sk);
if (IS_ERR(rt))
goto no_route;
if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway)
if (opt && opt->opt.is_strictroute && rt->rt_gw_family)
goto route_err;
rcu_read_unlock();
return &rt->dst;
......@@ -602,7 +602,7 @@ struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
rt = ip_route_output_flow(net, fl4, sk);
if (IS_ERR(rt))
goto no_route;
if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway)
if (opt && opt->opt.is_strictroute && rt->rt_gw_family)
goto route_err;
return &rt->dst;
......
......@@ -123,7 +123,7 @@ int ip_forward(struct sk_buff *skb)
rt = skb_rtable(skb);
if (opt->is_strictroute && rt->rt_uses_gateway)
if (opt->is_strictroute && rt->rt_gw_family)
goto sr_failed;
IPCB(skb)->flags |= IPSKB_FORWARDED;
......
......@@ -472,7 +472,7 @@ int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
skb_dst_set_noref(skb, &rt->dst);
packet_routed:
if (inet_opt && inet_opt->opt.is_strictroute && rt->rt_uses_gateway)
if (inet_opt && inet_opt->opt.is_strictroute && rt->rt_gw_family)
goto no_route;
/* OK, we know where to send it, allocate and build IP header. */
......
......@@ -434,14 +434,13 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr)
{
const struct rtable *rt = container_of(dst, struct rtable, dst);
struct net_device *dev = dst->dev;
const __be32 *pkey = daddr;
const struct rtable *rt;
struct neighbour *n;
rt = (const struct rtable *) dst;
if (rt->rt_gateway)
pkey = (const __be32 *) &rt->rt_gateway;
if (rt->rt_gw_family == AF_INET)
pkey = (const __be32 *) &rt->rt_gw4;
else if (skb)
pkey = &ip_hdr(skb)->daddr;
......@@ -453,13 +452,12 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr)
{
const struct rtable *rt = container_of(dst, struct rtable, dst);
struct net_device *dev = dst->dev;
const __be32 *pkey = daddr;
const struct rtable *rt;
rt = (const struct rtable *)dst;
if (rt->rt_gateway)
pkey = (const __be32 *)&rt->rt_gateway;
if (rt->rt_gw_family == AF_INET)
pkey = (const __be32 *)&rt->rt_gw4;
else if (!daddr ||
(rt->rt_flags &
(RTCF_MULTICAST | RTCF_BROADCAST | RTCF_LOCAL)))
......@@ -629,8 +627,8 @@ static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnh
if (fnhe->fnhe_gw) {
rt->rt_flags |= RTCF_REDIRECTED;
rt->rt_gateway = fnhe->fnhe_gw;
rt->rt_uses_gateway = 1;
rt->rt_gw_family = AF_INET;
rt->rt_gw4 = fnhe->fnhe_gw;
}
}
......@@ -747,7 +745,7 @@ static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flow
return;
}
if (rt->rt_gateway != old_gw)
if (rt->rt_gw_family != AF_INET || rt->rt_gw4 != old_gw)
return;
in_dev = __in_dev_get_rcu(dev);
......@@ -1282,7 +1280,7 @@ static unsigned int ipv4_mtu(const struct dst_entry *dst)
mtu = READ_ONCE(dst->dev->mtu);
if (unlikely(ip_mtu_locked(dst))) {
if (rt->rt_uses_gateway && mtu > 576)
if (rt->rt_gw_family && mtu > 576)
mtu = 576;
}
......@@ -1410,8 +1408,10 @@ static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe,
orig = NULL;
}
fill_route_from_fnhe(rt, fnhe);
if (!rt->rt_gateway)
rt->rt_gateway = daddr;
if (!rt->rt_gw4) {
rt->rt_gw4 = daddr;
rt->rt_gw_family = AF_INET;
}
if (do_cache) {
dst_hold(&rt->dst);
......@@ -1538,8 +1538,8 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
struct fib_nh *nh = container_of(nhc, struct fib_nh, nh_common);
if (nh->fib_nh_gw4 && nh->fib_nh_scope == RT_SCOPE_LINK) {
rt->rt_gateway = nh->fib_nh_gw4;
rt->rt_uses_gateway = 1;
rt->rt_gw4 = nh->fib_nh_gw4;
rt->rt_gw_family = AF_INET;
}
ip_dst_init_metrics(&rt->dst, fi->fib_metrics);
......@@ -1557,8 +1557,10 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
* However, if we are unsuccessful at storing this
* route into the cache we really need to set it.
*/
if (!rt->rt_gateway)
rt->rt_gateway = daddr;
if (!rt->rt_gw4) {
rt->rt_gw_family = AF_INET;
rt->rt_gw4 = daddr;
}
rt_add_uncached_list(rt);
}
} else
......@@ -1591,8 +1593,8 @@ struct rtable *rt_dst_alloc(struct net_device *dev,
rt->rt_iif = 0;
rt->rt_pmtu = 0;
rt->rt_mtu_locked = 0;
rt->rt_gateway = 0;
rt->rt_uses_gateway = 0;
rt->rt_gw_family = 0;
rt->rt_gw4 = 0;
INIT_LIST_HEAD(&rt->rt_uncached);
rt->dst.output = ip_output;
......@@ -2595,8 +2597,9 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
rt->rt_genid = rt_genid_ipv4(net);
rt->rt_flags = ort->rt_flags;
rt->rt_type = ort->rt_type;
rt->rt_gateway = ort->rt_gateway;
rt->rt_uses_gateway = ort->rt_uses_gateway;
rt->rt_gw_family = ort->rt_gw_family;
if (rt->rt_gw_family == AF_INET)
rt->rt_gw4 = ort->rt_gw4;
INIT_LIST_HEAD(&rt->rt_uncached);
}
......@@ -2675,8 +2678,8 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
if (nla_put_in_addr(skb, RTA_PREFSRC, fl4->saddr))
goto nla_put_failure;
}
if (rt->rt_uses_gateway &&
nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gateway))
if (rt->rt_gw_family == AF_INET &&
nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gw4))
goto nla_put_failure;
expires = rt->dst.expires;
......
......@@ -97,8 +97,9 @@ static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
RTCF_LOCAL);
xdst->u.rt.rt_type = rt->rt_type;
xdst->u.rt.rt_gateway = rt->rt_gateway;
xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
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;
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);
......
......@@ -137,10 +137,13 @@ static int mpls_xmit(struct sk_buff *skb)
mpls_stats_inc_outucastpkts(out_dev, skb);
if (rt)
err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt->rt_gateway,
skb);
else if (rt6) {
if (rt) {
if (rt->rt_gw_family == AF_INET)
err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt->rt_gw4,
skb);
else
err = -EAFNOSUPPORT;
} else if (rt6) {
if (ipv6_addr_v4mapped(&rt6->rt6i_gateway)) {
/* 6PE (RFC 4798) */
err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt6->rt6i_gateway.s6_addr32[3],
......
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