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// SPDX-License-Identifier: GPL-2.0-or-later
/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
*/
#include "ipvlan.h"
static unsigned int ipvlan_netid __read_mostly;
struct ipvlan_netns {
unsigned int ipvl_nf_hook_refcnt;
};
static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb,
struct net_device *dev)
{
struct ipvl_addr *addr = NULL;
struct ipvl_port *port;
int addr_type;
void *lyr3h;
if (!dev || !netif_is_ipvlan_port(dev))
goto out;
port = ipvlan_port_get_rcu(dev);
if (!port || port->mode != IPVLAN_MODE_L3S)
goto out;
lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
if (!lyr3h)
goto out;
addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
out:
return addr;
}
static struct sk_buff *ipvlan_l3_rcv(struct net_device *dev,
struct sk_buff *skb, u16 proto)
{
struct ipvl_addr *addr;
struct net_device *sdev;
addr = ipvlan_skb_to_addr(skb, dev);
if (!addr)
goto out;
sdev = addr->master->dev;
switch (proto) {
case AF_INET:
{
struct iphdr *ip4h = ip_hdr(skb);
int err;
err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr,
ip4h->tos, sdev);
if (unlikely(err))
goto out;
break;
}
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
{
struct dst_entry *dst;
struct ipv6hdr *ip6h = ipv6_hdr(skb);
int flags = RT6_LOOKUP_F_HAS_SADDR;
struct flowi6 fl6 = {
.flowi6_iif = sdev->ifindex,
.daddr = ip6h->daddr,
.saddr = ip6h->saddr,
.flowlabel = ip6_flowinfo(ip6h),
.flowi6_mark = skb->mark,
.flowi6_proto = ip6h->nexthdr,
};
skb_dst_drop(skb);
dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6,
skb, flags);
skb_dst_set(skb, dst);
break;
}
#endif
default:
break;
}
out:
return skb;
}
static const struct l3mdev_ops ipvl_l3mdev_ops = {
.l3mdev_l3_rcv = ipvlan_l3_rcv,
};
static unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct ipvl_addr *addr;
unsigned int len;
addr = ipvlan_skb_to_addr(skb, skb->dev);
if (!addr)
goto out;
skb->dev = addr->master->dev;
skb->skb_iif = skb->dev->ifindex;
#if IS_ENABLED(CONFIG_IPV6)
if (addr->atype == IPVL_IPV6)
IP6CB(skb)->iif = skb->dev->ifindex;
#endif
len = skb->len + ETH_HLEN;
ipvlan_count_rx(addr->master, len, true, false);
out:
return NF_ACCEPT;
}
static const struct nf_hook_ops ipvl_nfops[] = {
{
.hook = ipvlan_nf_input,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
.priority = INT_MAX,
},
#if IS_ENABLED(CONFIG_IPV6)
{
.hook = ipvlan_nf_input,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_IN,
.priority = INT_MAX,
},
#endif
};
static int ipvlan_register_nf_hook(struct net *net)
{
struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
int err = 0;
if (!vnet->ipvl_nf_hook_refcnt) {
err = nf_register_net_hooks(net, ipvl_nfops,
ARRAY_SIZE(ipvl_nfops));
if (!err)
vnet->ipvl_nf_hook_refcnt = 1;
} else {
vnet->ipvl_nf_hook_refcnt++;
}
return err;
}
static void ipvlan_unregister_nf_hook(struct net *net)
{
struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
if (WARN_ON(!vnet->ipvl_nf_hook_refcnt))
return;
vnet->ipvl_nf_hook_refcnt--;
if (!vnet->ipvl_nf_hook_refcnt)
nf_unregister_net_hooks(net, ipvl_nfops,
ARRAY_SIZE(ipvl_nfops));
}
void ipvlan_migrate_l3s_hook(struct net *oldnet, struct net *newnet)
{
struct ipvlan_netns *old_vnet;
ASSERT_RTNL();
old_vnet = net_generic(oldnet, ipvlan_netid);
if (!old_vnet->ipvl_nf_hook_refcnt)
return;
ipvlan_register_nf_hook(newnet);
ipvlan_unregister_nf_hook(oldnet);
}
static void ipvlan_ns_exit(struct net *net)
{
struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
vnet->ipvl_nf_hook_refcnt = 0;
nf_unregister_net_hooks(net, ipvl_nfops,
ARRAY_SIZE(ipvl_nfops));
}
}
static struct pernet_operations ipvlan_net_ops = {
.id = &ipvlan_netid,
.size = sizeof(struct ipvlan_netns),
.exit = ipvlan_ns_exit,
};
int ipvlan_l3s_init(void)
{
return register_pernet_subsys(&ipvlan_net_ops);
}
void ipvlan_l3s_cleanup(void)
{
unregister_pernet_subsys(&ipvlan_net_ops);
}
int ipvlan_l3s_register(struct ipvl_port *port)
{
struct net_device *dev = port->dev;
int ret;
ASSERT_RTNL();
ret = ipvlan_register_nf_hook(read_pnet(&port->pnet));
if (!ret) {
dev->l3mdev_ops = &ipvl_l3mdev_ops;
dev->priv_flags |= IFF_L3MDEV_RX_HANDLER;
}
return ret;
}
void ipvlan_l3s_unregister(struct ipvl_port *port)
{
struct net_device *dev = port->dev;
ASSERT_RTNL();
dev->priv_flags &= ~IFF_L3MDEV_RX_HANDLER;
ipvlan_unregister_nf_hook(read_pnet(&port->pnet));
dev->l3mdev_ops = NULL;
}
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