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Merge branch 'x-netns'

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Nicolas Dichtel says:

====================
This series is a follow up of the previous series whcih adds this
functionality for sit tunnels.

The goal is to add x-netns support for the module ipip and ip6_tunnel,
ie. the encapsulation addresses and the network device are not owned
by the same namespace.

Note that the two first patches are cleanups.

Example to configure an ipip tunnel:

modprobe ipip
ip netns add netns1
ip link add ipip1 type ipip remote 10.16.0.121 local 10.16.0.249
ip l s ipip1 netns netns1
ip netns exec netns1 ip l s lo up
ip netns exec netns1 ip l s ipip1 up
ip netns exec netns1 ip a a dev ipip1 192.168.2.123 remote 192.168.2.121

or an ip6_tunnel:

modprobe ip6_tunnel
ip netns add netns1
ip link add ip6tnl1 type ip6tnl remote 2001:660:3008:c1c3::121 local 2001:660:3008:c1c3::123
ip l s ip6tnl1 netns netns1
ip netns exec netns1 ip l s lo up
ip netns exec netns1 ip l s ip6tnl1 up
ip netns exec netns1 ip a a dev ip6tnl1 192.168.1.123 remote 192.168.1.121
ip netns exec netns1 ip -6 a a dev ip6tnl1 2001:1235::123 remote 2001:1235::121

v2: remove the patch 1/3 of the v1 series (already included)
    use net_eq()
    add patch 1/4 and 2/4
====================-

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2013-08-15 01:01:27 -07:00
commit f36f092065
10 changed files with 81 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/ip6_tunnel.h
View File

@ -36,6 +36,7 @@ struct __ip6_tnl_parm {
struct ip6_tnl {
struct ip6_tnl __rcu *next; /* next tunnel in list */
struct net_device *dev; /* virtual device associated with tunnel */
struct net *net; /* netns for packet i/o */
struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
struct flowi fl; /* flowi template for xmit */
struct dst_entry *dst_cache; /* cached dst */

2
include/net/ip_tunnels.h
View File

@ -102,7 +102,7 @@ void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
struct rtnl_link_ops *ops, char *devname);
void ip_tunnel_delete_net(struct ip_tunnel_net *itn);
void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
const struct iphdr *tnl_params, const u8 protocol);

6
net/core/dev.c
View File

@ -1691,13 +1691,13 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
kfree_skb(skb);
return NET_RX_DROP;
}
skb_scrub_packet(skb);
skb->protocol = eth_type_trans(skb, dev);
/* eth_type_trans() can set pkt_type.
* clear pkt_type _after_ calling eth_type_trans()
* call skb_scrub_packet() after it to clear pkt_type _after_ calling
* eth_type_trans().
*/
skb->pkt_type = PACKET_HOST;
skb_scrub_packet(skb);
return netif_rx(skb);
}

4
net/ipv4/ip_gre.c
View File

@ -534,7 +534,7 @@ static int __net_init ipgre_init_net(struct net *net)
static void __net_exit ipgre_exit_net(struct net *net)
{
struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id);
ip_tunnel_delete_net(itn);
ip_tunnel_delete_net(itn, &ipgre_link_ops);
}
static struct pernet_operations ipgre_net_ops = {
@ -767,7 +767,7 @@ static int __net_init ipgre_tap_init_net(struct net *net)
static void __net_exit ipgre_tap_exit_net(struct net *net)
{
struct ip_tunnel_net *itn = net_generic(net, gre_tap_net_id);
ip_tunnel_delete_net(itn);
ip_tunnel_delete_net(itn, &ipgre_tap_ops);
}
static struct pernet_operations ipgre_tap_net_ops = {

52
net/ipv4/ip_tunnel.c
View File

@ -350,7 +350,7 @@ static int ip_tunnel_bind_dev(struct net_device *dev)
struct flowi4 fl4;
struct rtable *rt;
rt = ip_route_output_tunnel(dev_net(dev), &fl4,
rt = ip_route_output_tunnel(tunnel->net, &fl4,
tunnel->parms.iph.protocol,
iph->daddr, iph->saddr,
tunnel->parms.o_key,
@ -365,7 +365,7 @@ static int ip_tunnel_bind_dev(struct net_device *dev)
}
if (!tdev && tunnel->parms.link)
tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
if (tdev) {
hlen = tdev->hard_header_len + tdev->needed_headroom;
@ -454,15 +454,16 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
tstats->rx_bytes += skb->len;
u64_stats_update_end(&tstats->syncp);
if (tunnel->net != dev_net(tunnel->dev))
skb_scrub_packet(skb);
if (tunnel->dev->type == ARPHRD_ETHER) {
skb->protocol = eth_type_trans(skb, tunnel->dev);
skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
} else {
skb->dev = tunnel->dev;
}
if (!net_eq(tunnel->net, dev_net(tunnel->dev)))
skb_scrub_packet(skb);
gro_cells_receive(&tunnel->gro_cells, skb);
return 0;
@ -613,7 +614,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
goto tx_error;
}
if (tunnel->net != dev_net(dev))
if (!net_eq(tunnel->net, dev_net(dev)))
skb_scrub_packet(skb);
if (tunnel->err_count > 0) {
@ -653,7 +654,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
}
}
err = iptunnel_xmit(dev_net(dev), rt, skb,
err = iptunnel_xmit(tunnel->net, rt, skb,
fl4.saddr, fl4.daddr, protocol,
ip_tunnel_ecn_encap(tos, inner_iph, skb), ttl, df);
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
@ -820,11 +821,10 @@ static void ip_tunnel_dev_free(struct net_device *dev)
void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
{
struct net *net = dev_net(dev);
struct ip_tunnel *tunnel = netdev_priv(dev);
struct ip_tunnel_net *itn;
itn = net_generic(net, tunnel->ip_tnl_net_id);
itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id);
if (itn->fb_tunnel_dev != dev) {
ip_tunnel_del(netdev_priv(dev));
@ -854,6 +854,10 @@ int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
rtnl_lock();
itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
/* FB netdevice is special: we have one, and only one per netns.
* Allowing to move it to another netns is clearly unsafe.
*/
itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
rtnl_unlock();
if (IS_ERR(itn->fb_tunnel_dev))
@ -863,28 +867,39 @@ int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
}
EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head)
static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head,
struct rtnl_link_ops *ops)
{
struct net *net = dev_net(itn->fb_tunnel_dev);
struct net_device *dev, *aux;
int h;
for_each_netdev_safe(net, dev, aux)
if (dev->rtnl_link_ops == ops)
unregister_netdevice_queue(dev, head);
for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
struct ip_tunnel *t;
struct hlist_node *n;
struct hlist_head *thead = &itn->tunnels[h];
hlist_for_each_entry_safe(t, n, thead, hash_node)
unregister_netdevice_queue(t->dev, head);
/* If dev is in the same netns, it has already
* been added to the list by the previous loop.
*/
if (!net_eq(dev_net(t->dev), net))
unregister_netdevice_queue(t->dev, head);
}
if (itn->fb_tunnel_dev)
unregister_netdevice_queue(itn->fb_tunnel_dev, head);
}
void ip_tunnel_delete_net(struct ip_tunnel_net *itn)
void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops)
{
LIST_HEAD(list);
rtnl_lock();
ip_tunnel_destroy(itn, &list);
ip_tunnel_destroy(itn, &list, ops);
unregister_netdevice_many(&list);
rtnl_unlock();
}
@ -928,23 +943,21 @@ EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
struct ip_tunnel_parm *p)
{
struct ip_tunnel *t, *nt;
struct net *net = dev_net(dev);
struct ip_tunnel *t;
struct ip_tunnel *tunnel = netdev_priv(dev);
struct net *net = tunnel->net;
struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
if (dev == itn->fb_tunnel_dev)
return -EINVAL;
nt = netdev_priv(dev);
t = ip_tunnel_find(itn, p, dev->type);
if (t) {
if (t->dev != dev)
return -EEXIST;
} else {
t = nt;
t = tunnel;
if (dev->type != ARPHRD_ETHER) {
unsigned int nflags = 0;
@ -983,6 +996,7 @@ int ip_tunnel_init(struct net_device *dev)
}
tunnel->dev = dev;
tunnel->net = dev_net(dev);
strcpy(tunnel->parms.name, dev->name);
iph->version = 4;
iph->ihl = 5;
@ -993,8 +1007,8 @@ EXPORT_SYMBOL_GPL(ip_tunnel_init);
void ip_tunnel_uninit(struct net_device *dev)
{
struct net *net = dev_net(dev);
struct ip_tunnel *tunnel = netdev_priv(dev);
struct net *net = tunnel->net;
struct ip_tunnel_net *itn;
itn = net_generic(net, tunnel->ip_tnl_net_id);

2
net/ipv4/ip_vti.c
View File

@ -318,7 +318,7 @@ static int __net_init vti_init_net(struct net *net)
static void __net_exit vti_exit_net(struct net *net)
{
struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
ip_tunnel_delete_net(itn);
ip_tunnel_delete_net(itn, &vti_link_ops);
}
static struct pernet_operations vti_net_ops = {

3
net/ipv4/ipip.c
View File

@ -286,7 +286,6 @@ static void ipip_tunnel_setup(struct net_device *dev)
dev->flags = IFF_NOARP;
dev->iflink = 0;
dev->addr_len = 4;
dev->features |= NETIF_F_NETNS_LOCAL;
dev->features |= NETIF_F_LLTX;
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
@ -437,7 +436,7 @@ static int __net_init ipip_init_net(struct net *net)
static void __net_exit ipip_exit_net(struct net *net)
{
struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
ip_tunnel_delete_net(itn);
ip_tunnel_delete_net(itn, &ipip_link_ops);
}
static struct pernet_operations ipip_net_ops = {

5
net/ipv6/ip6_gre.c
View File

@ -335,6 +335,7 @@ static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
dev->rtnl_link_ops = &ip6gre_link_ops;
nt->dev = dev;
nt->net = dev_net(dev);
ip6gre_tnl_link_config(nt, 1);
if (register_netdevice(dev) < 0)
@ -1255,6 +1256,7 @@ static int ip6gre_tunnel_init(struct net_device *dev)
tunnel = netdev_priv(dev);
tunnel->dev = dev;
tunnel->net = dev_net(dev);
strcpy(tunnel->parms.name, dev->name);
memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
@ -1275,6 +1277,7 @@ static void ip6gre_fb_tunnel_init(struct net_device *dev)
struct ip6_tnl *tunnel = netdev_priv(dev);
tunnel->dev = dev;
tunnel->net = dev_net(dev);
strcpy(tunnel->parms.name, dev->name);
tunnel->hlen = sizeof(struct ipv6hdr) + 4;
@ -1450,6 +1453,7 @@ static int ip6gre_tap_init(struct net_device *dev)
tunnel = netdev_priv(dev);
tunnel->dev = dev;
tunnel->net = dev_net(dev);
strcpy(tunnel->parms.name, dev->name);
ip6gre_tnl_link_config(tunnel, 1);
@ -1501,6 +1505,7 @@ static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
eth_hw_addr_random(dev);
nt->dev = dev;
nt->net = dev_net(dev);
ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
/* Can use a lockless transmit, unless we generate output sequences */

41
net/ipv6/ip6_tunnel.c
View File

@ -315,6 +315,7 @@ static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
t = netdev_priv(dev);
t->parms = *p;
t->net = dev_net(dev);
err = ip6_tnl_create2(dev);
if (err < 0)
goto failed_free;
@ -374,7 +375,7 @@ static void
ip6_tnl_dev_uninit(struct net_device *dev)
{
struct ip6_tnl *t = netdev_priv(dev);
struct net *net = dev_net(dev);
struct net *net = t->net;
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
if (dev == ip6n->fb_tnl_dev)
@ -741,7 +742,7 @@ int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
{
struct __ip6_tnl_parm *p = &t->parms;
int ret = 0;
struct net *net = dev_net(t->dev);
struct net *net = t->net;
if ((p->flags & IP6_TNL_F_CAP_RCV) ||
((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
@ -827,6 +828,9 @@ static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
tstats->rx_packets++;
tstats->rx_bytes += skb->len;
if (!net_eq(t->net, dev_net(t->dev)))
skb_scrub_packet(skb);
netif_rx(skb);
rcu_read_unlock();
@ -895,7 +899,7 @@ int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
{
struct __ip6_tnl_parm *p = &t->parms;
int ret = 0;
struct net *net = dev_net(t->dev);
struct net *net = t->net;
if (p->flags & IP6_TNL_F_CAP_XMIT) {
struct net_device *ldev = NULL;
@ -945,8 +949,8 @@ static int ip6_tnl_xmit2(struct sk_buff *skb,
int encap_limit,
__u32 *pmtu)
{
struct net *net = dev_net(dev);
struct ip6_tnl *t = netdev_priv(dev);
struct net *net = t->net;
struct net_device_stats *stats = &t->dev->stats;
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
struct ipv6_tel_txoption opt;
@ -996,6 +1000,9 @@ static int ip6_tnl_xmit2(struct sk_buff *skb,
goto tx_err_dst_release;
}
if (!net_eq(t->net, dev_net(dev)))
skb_scrub_packet(skb);
/*
* Okay, now see if we can stuff it in the buffer as-is.
*/
@ -1202,7 +1209,7 @@ static void ip6_tnl_link_config(struct ip6_tnl *t)
int strict = (ipv6_addr_type(&p->raddr) &
(IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
struct rt6_info *rt = rt6_lookup(dev_net(dev),
struct rt6_info *rt = rt6_lookup(t->net,
&p->raddr, &p->laddr,
p->link, strict);
@ -1251,7 +1258,7 @@ ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
{
struct net *net = dev_net(t->dev);
struct net *net = t->net;
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
int err;
@ -1463,7 +1470,6 @@ static void ip6_tnl_dev_setup(struct net_device *dev)
dev->mtu-=8;
dev->flags |= IFF_NOARP;
dev->addr_len = sizeof(struct in6_addr);
dev->features |= NETIF_F_NETNS_LOCAL;
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
}
@ -1479,6 +1485,7 @@ ip6_tnl_dev_init_gen(struct net_device *dev)
struct ip6_tnl *t = netdev_priv(dev);
t->dev = dev;
t->net = dev_net(dev);
dev->tstats = alloc_percpu(struct pcpu_tstats);
if (!dev->tstats)
return -ENOMEM;
@ -1596,9 +1603,9 @@ static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[])
{
struct ip6_tnl *t;
struct ip6_tnl *t = netdev_priv(dev);
struct __ip6_tnl_parm p;
struct net *net = dev_net(dev);
struct net *net = t->net;
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
if (dev == ip6n->fb_tnl_dev)
@ -1699,14 +1706,24 @@ static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
{
struct net *net = dev_net(ip6n->fb_tnl_dev);
struct net_device *dev, *aux;
int h;
struct ip6_tnl *t;
LIST_HEAD(list);
for_each_netdev_safe(net, dev, aux)
if (dev->rtnl_link_ops == &ip6_link_ops)
unregister_netdevice_queue(dev, &list);
for (h = 0; h < HASH_SIZE; h++) {
t = rtnl_dereference(ip6n->tnls_r_l[h]);
while (t != NULL) {
unregister_netdevice_queue(t->dev, &list);
/* If dev is in the same netns, it has already
* been added to the list by the previous loop.
*/
if (!net_eq(dev_net(t->dev), net))
unregister_netdevice_queue(t->dev, &list);
t = rtnl_dereference(t->next);
}
}
@ -1732,6 +1749,10 @@ static int __net_init ip6_tnl_init_net(struct net *net)
if (!ip6n->fb_tnl_dev)
goto err_alloc_dev;
dev_net_set(ip6n->fb_tnl_dev, net);
/* FB netdevice is special: we have one, and only one per netns.
* Allowing to move it to another netns is clearly unsafe.
*/
ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
if (err < 0)

6
net/ipv6/sit.c
View File

@ -621,7 +621,7 @@ static int ipip6_rcv(struct sk_buff *skb)
tstats->rx_packets++;
tstats->rx_bytes += skb->len;
if (tunnel->net != dev_net(tunnel->dev))
if (!net_eq(tunnel->net, dev_net(tunnel->dev)))
skb_scrub_packet(skb);
netif_rx(skb);
@ -860,7 +860,7 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
tunnel->err_count = 0;
}
if (tunnel->net != dev_net(dev))
if (!net_eq(tunnel->net, dev_net(dev)))
skb_scrub_packet(skb);
/*
@ -1589,7 +1589,7 @@ static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_hea
/* If dev is in the same netns, it has already
* been added to the list by the previous loop.
*/
if (dev_net(t->dev) != net)
if (!net_eq(dev_net(t->dev), net))
unregister_netdevice_queue(t->dev,
head);
t = rtnl_dereference(t->next);