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Commit b9959fd3 authored by Amerigo Wang's avatar Amerigo Wang Committed by David S. Miller
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vti: switch to new ip tunnel code 

GRE tunnel and IPIP tunnel already switched to the new
ip tunnel code, VTI tunnel can use it too.

Cc: Pravin B Shelar <pshelar@nicira.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: Saurabh Mohan <saurabh.mohan@vyatta.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: default avatarCong Wang <amwang@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2b52c3ad
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Showing with 52 additions and 476 deletions
net/ipv4/ip_vti.c
View file @ b9959fd3
......@@ -44,176 +44,10 @@
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#define HASH_SIZE 16
#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&(HASH_SIZE-1))
static struct rtnl_link_ops vti_link_ops __read_mostly;
static int vti_net_id __read_mostly;
struct vti_net {
struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
struct ip_tunnel __rcu *tunnels_wc[1];
struct ip_tunnel __rcu **tunnels[4];
struct net_device *fb_tunnel_dev;
};
static int vti_fb_tunnel_init(struct net_device *dev);
static int vti_tunnel_init(struct net_device *dev);
static void vti_tunnel_setup(struct net_device *dev);
static void vti_dev_free(struct net_device *dev);
static int vti_tunnel_bind_dev(struct net_device *dev);
#define VTI_XMIT(stats1, stats2) do { \
int err; \
int pkt_len = skb->len; \
err = dst_output(skb); \
if (net_xmit_eval(err) == 0) { \
u64_stats_update_begin(&(stats1)->syncp); \
(stats1)->tx_bytes += pkt_len; \
(stats1)->tx_packets++; \
u64_stats_update_end(&(stats1)->syncp); \
} else { \
(stats2)->tx_errors++; \
(stats2)->tx_aborted_errors++; \
} \
} while (0)
static struct ip_tunnel *vti_tunnel_lookup(struct net *net,
__be32 remote, __be32 local)
{
unsigned h0 = HASH(remote);
unsigned h1 = HASH(local);
struct ip_tunnel *t;
struct vti_net *ipn = net_generic(net, vti_net_id);
for_each_ip_tunnel_rcu(t, ipn->tunnels_r_l[h0 ^ h1])
if (local == t->parms.iph.saddr &&
remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
return t;
for_each_ip_tunnel_rcu(t, ipn->tunnels_r[h0])
if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
return t;
for_each_ip_tunnel_rcu(t, ipn->tunnels_l[h1])
if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
return t;
for_each_ip_tunnel_rcu(t, ipn->tunnels_wc[0])
if (t && (t->dev->flags&IFF_UP))
return t;
return NULL;
}
static struct ip_tunnel __rcu **__vti_bucket(struct vti_net *ipn,
struct ip_tunnel_parm *parms)
{
__be32 remote = parms->iph.daddr;
__be32 local = parms->iph.saddr;
unsigned h = 0;
int prio = 0;
if (remote) {
prio |= 2;
h ^= HASH(remote);
}
if (local) {
prio |= 1;
h ^= HASH(local);
}
return &ipn->tunnels[prio][h];
}
static inline struct ip_tunnel __rcu **vti_bucket(struct vti_net *ipn,
struct ip_tunnel *t)
{
return __vti_bucket(ipn, &t->parms);
}
static void vti_tunnel_unlink(struct vti_net *ipn, struct ip_tunnel *t)
{
struct ip_tunnel __rcu **tp;
struct ip_tunnel *iter;
for (tp = vti_bucket(ipn, t);
(iter = rtnl_dereference(*tp)) != NULL;
tp = &iter->next) {
if (t == iter) {
rcu_assign_pointer(*tp, t->next);
break;
}
}
}
static void vti_tunnel_link(struct vti_net *ipn, struct ip_tunnel *t)
{
struct ip_tunnel __rcu **tp = vti_bucket(ipn, t);
rcu_assign_pointer(t->next, rtnl_dereference(*tp));
rcu_assign_pointer(*tp, t);
}
static struct ip_tunnel *vti_tunnel_locate(struct net *net,
struct ip_tunnel_parm *parms,
int create)
{
__be32 remote = parms->iph.daddr;
__be32 local = parms->iph.saddr;
struct ip_tunnel *t, *nt;
struct ip_tunnel __rcu **tp;
struct net_device *dev;
char name[IFNAMSIZ];
struct vti_net *ipn = net_generic(net, vti_net_id);
for (tp = __vti_bucket(ipn, parms);
(t = rtnl_dereference(*tp)) != NULL;
tp = &t->next) {
if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
return t;
}
if (!create)
return NULL;
if (parms->name[0])
strlcpy(name, parms->name, IFNAMSIZ);
else
strcpy(name, "vti%d");
dev = alloc_netdev(sizeof(*t), name, vti_tunnel_setup);
if (dev == NULL)
return NULL;
dev_net_set(dev, net);
nt = netdev_priv(dev);
nt->parms = *parms;
dev->rtnl_link_ops = &vti_link_ops;
vti_tunnel_bind_dev(dev);
if (register_netdevice(dev) < 0)
goto failed_free;
dev_hold(dev);
vti_tunnel_link(ipn, nt);
return nt;
failed_free:
free_netdev(dev);
return NULL;
}
static void vti_tunnel_uninit(struct net_device *dev)
{
struct net *net = dev_net(dev);
struct vti_net *ipn = net_generic(net, vti_net_id);
vti_tunnel_unlink(ipn, netdev_priv(dev));
dev_put(dev);
}
static int vti_err(struct sk_buff *skb, u32 info)
{
......@@ -222,6 +56,8 @@ static int vti_err(struct sk_buff *skb, u32 info)
* 8 bytes of packet payload. It means, that precise relaying of
* ICMP in the real Internet is absolutely infeasible.
*/
struct net *net = dev_net(skb->dev);
struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
struct iphdr *iph = (struct iphdr *)skb->data;
const int type = icmp_hdr(skb)->type;
const int code = icmp_hdr(skb)->code;
......@@ -252,7 +88,8 @@ static int vti_err(struct sk_buff *skb, u32 info)
err = -ENOENT;
t = vti_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
iph->daddr, iph->saddr, 0);
if (t == NULL)
goto out;
......@@ -281,8 +118,11 @@ static int vti_rcv(struct sk_buff *skb)
{
struct ip_tunnel *tunnel;
const struct iphdr *iph = ip_hdr(skb);
struct net *net = dev_net(skb->dev);
struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
tunnel = vti_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
iph->saddr, iph->daddr, 0);
if (tunnel != NULL) {
struct pcpu_tstats *tstats;
......@@ -311,7 +151,6 @@ static int vti_rcv(struct sk_buff *skb)
static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
struct pcpu_tstats *tstats;
struct iphdr *tiph = &tunnel->parms.iph;
u8 tos;
struct rtable *rt; /* Route to the other host */
......@@ -319,6 +158,7 @@ static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
struct iphdr *old_iph = ip_hdr(skb);
__be32 dst = tiph->daddr;
struct flowi4 fl4;
int err;
if (skb->protocol != htons(ETH_P_IP))
goto tx_error;
......@@ -367,8 +207,10 @@ static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
nf_reset(skb);
skb->dev = skb_dst(skb)->dev;
tstats = this_cpu_ptr(dev->tstats);
VTI_XMIT(tstats, &dev->stats);
err = dst_output(skb);
if (net_xmit_eval(err) == 0)
err = skb->len;
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
return NETDEV_TX_OK;
tx_error_icmp:
......@@ -379,198 +221,57 @@ static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_OK;
}
static int vti_tunnel_bind_dev(struct net_device *dev)
{
struct net_device *tdev = NULL;
struct ip_tunnel *tunnel;
struct iphdr *iph;
tunnel = netdev_priv(dev);
iph = &tunnel->parms.iph;
if (iph->daddr) {
struct rtable *rt;
struct flowi4 fl4;
memset(&fl4, 0, sizeof(fl4));
flowi4_init_output(&fl4, tunnel->parms.link,
be32_to_cpu(tunnel->parms.i_key),
RT_TOS(iph->tos), RT_SCOPE_UNIVERSE,
IPPROTO_IPIP, 0,
iph->daddr, iph->saddr, 0, 0);
rt = ip_route_output_key(dev_net(dev), &fl4);
if (!IS_ERR(rt)) {
tdev = rt->dst.dev;
ip_rt_put(rt);
}
dev->flags |= IFF_POINTOPOINT;
}
if (!tdev && tunnel->parms.link)
tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
if (tdev) {
dev->hard_header_len = tdev->hard_header_len +
sizeof(struct iphdr);
dev->mtu = tdev->mtu;
}
dev->iflink = tunnel->parms.link;
return dev->mtu;
}
static int
vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
int err = 0;
struct ip_tunnel_parm p;
struct ip_tunnel *t;
struct net *net = dev_net(dev);
struct vti_net *ipn = net_generic(net, vti_net_id);
switch (cmd) {
case SIOCGETTUNNEL:
t = NULL;
if (dev == ipn->fb_tunnel_dev) {
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
sizeof(p))) {
err = -EFAULT;
break;
}
t = vti_tunnel_locate(net, &p, 0);
}
if (t == NULL)
t = netdev_priv(dev);
memcpy(&p, &t->parms, sizeof(p));
p.i_flags |= GRE_KEY | VTI_ISVTI;
p.o_flags |= GRE_KEY;
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
err = -EFAULT;
break;
case SIOCADDTUNNEL:
case SIOCCHGTUNNEL:
err = -EPERM;
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto done;
err = -EFAULT;
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
goto done;
return -EFAULT;
err = -EINVAL;
if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
p.iph.ihl != 5)
goto done;
t = vti_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
if (t != NULL) {
if (t->dev != dev) {
err = -EEXIST;
break;
}
} else {
if (((dev->flags&IFF_POINTOPOINT) &&
!p.iph.daddr) ||
(!(dev->flags&IFF_POINTOPOINT) &&
p.iph.daddr)) {
err = -EINVAL;
break;
}
t = netdev_priv(dev);
vti_tunnel_unlink(ipn, t);
synchronize_net();
t->parms.iph.saddr = p.iph.saddr;
t->parms.iph.daddr = p.iph.daddr;
t->parms.i_key = p.i_key;
t->parms.o_key = p.o_key;
t->parms.iph.protocol = IPPROTO_IPIP;
memcpy(dev->dev_addr, &p.iph.saddr, 4);
memcpy(dev->broadcast, &p.iph.daddr, 4);
vti_tunnel_link(ipn, t);
netdev_state_change(dev);
}
return -EINVAL;
}
if (t) {
err = 0;
if (cmd == SIOCCHGTUNNEL) {
t->parms.i_key = p.i_key;
t->parms.o_key = p.o_key;
if (t->parms.link != p.link) {
t->parms.link = p.link;
vti_tunnel_bind_dev(dev);
netdev_state_change(dev);
}
}
err = ip_tunnel_ioctl(dev, &p, cmd);
if (err)
return err;
if (cmd != SIOCDELTUNNEL) {
p.i_flags |= GRE_KEY | VTI_ISVTI;
p.o_flags |= GRE_KEY;
if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms,
sizeof(p)))
err = -EFAULT;
} else
err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
break;
case SIOCDELTUNNEL:
err = -EPERM;
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto done;
if (dev == ipn->fb_tunnel_dev) {
err = -EFAULT;
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
sizeof(p)))
goto done;
err = -ENOENT;
t = vti_tunnel_locate(net, &p, 0);
if (t == NULL)
goto done;
err = -EPERM;
if (t->dev == ipn->fb_tunnel_dev)
goto done;
dev = t->dev;
}
unregister_netdevice(dev);
err = 0;
break;
default:
err = -EINVAL;
}
done:
return err;
}
static int vti_tunnel_change_mtu(struct net_device *dev, int new_mtu)
{
if (new_mtu < 68 || new_mtu > 0xFFF8)
return -EINVAL;
dev->mtu = new_mtu;
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
return -EFAULT;
return 0;
}
static const struct net_device_ops vti_netdev_ops = {
.ndo_init = vti_tunnel_init,
.ndo_uninit = vti_tunnel_uninit,
.ndo_uninit = ip_tunnel_uninit,
.ndo_start_xmit = vti_tunnel_xmit,
.ndo_do_ioctl = vti_tunnel_ioctl,
.ndo_change_mtu = vti_tunnel_change_mtu,
.ndo_change_mtu = ip_tunnel_change_mtu,
.ndo_get_stats64 = ip_tunnel_get_stats64,
};
static void vti_dev_free(struct net_device *dev)
static void vti_tunnel_setup(struct net_device *dev)
{
free_percpu(dev->tstats);
free_netdev(dev);
dev->netdev_ops = &vti_netdev_ops;
ip_tunnel_setup(dev, vti_net_id);
}
static void vti_tunnel_setup(struct net_device *dev)
static int vti_tunnel_init(struct net_device *dev)
{
dev->netdev_ops = &vti_netdev_ops;
dev->destructor = vti_dev_free;
struct ip_tunnel *tunnel = netdev_priv(dev);
struct iphdr *iph = &tunnel->parms.iph;
memcpy(dev->dev_addr, &iph->saddr, 4);
memcpy(dev->broadcast, &iph->daddr, 4);
dev->type = ARPHRD_TUNNEL;
dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
......@@ -581,38 +282,18 @@ static void vti_tunnel_setup(struct net_device *dev)
dev->features |= NETIF_F_NETNS_LOCAL;
dev->features |= NETIF_F_LLTX;
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
}
static int vti_tunnel_init(struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
tunnel->dev = dev;
strcpy(tunnel->parms.name, dev->name);
memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
dev->tstats = alloc_percpu(struct pcpu_tstats);
if (!dev->tstats)
return -ENOMEM;
return 0;
return ip_tunnel_init(dev);
}
static int __net_init vti_fb_tunnel_init(struct net_device *dev)
static void __net_init vti_fb_tunnel_init(struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
struct iphdr *iph = &tunnel->parms.iph;
struct vti_net *ipn = net_generic(dev_net(dev), vti_net_id);
iph->version = 4;
iph->protocol = IPPROTO_IPIP;
iph->ihl = 5;
dev_hold(dev);
rcu_assign_pointer(ipn->tunnels_wc[0], tunnel);
return 0;
}
static struct xfrm_tunnel vti_handler __read_mostly = {
......@@ -621,76 +302,30 @@ static struct xfrm_tunnel vti_handler __read_mostly = {
.priority = 1,
};
static void vti_destroy_tunnels(struct vti_net *ipn, struct list_head *head)
{
int prio;
for (prio = 1; prio < 4; prio++) {
int h;
for (h = 0; h < HASH_SIZE; h++) {
struct ip_tunnel *t;
t = rtnl_dereference(ipn->tunnels[prio][h]);
while (t != NULL) {
unregister_netdevice_queue(t->dev, head);
t = rtnl_dereference(t->next);
}
}
}
}
static int __net_init vti_init_net(struct net *net)
{
int err;
struct vti_net *ipn = net_generic(net, vti_net_id);
ipn->tunnels[0] = ipn->tunnels_wc;
ipn->tunnels[1] = ipn->tunnels_l;
ipn->tunnels[2] = ipn->tunnels_r;
ipn->tunnels[3] = ipn->tunnels_r_l;
ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel),
"ip_vti0",
vti_tunnel_setup);
if (!ipn->fb_tunnel_dev) {
err = -ENOMEM;
goto err_alloc_dev;
}
dev_net_set(ipn->fb_tunnel_dev, net);
err = vti_fb_tunnel_init(ipn->fb_tunnel_dev);
if (err)
goto err_reg_dev;
ipn->fb_tunnel_dev->rtnl_link_ops = &vti_link_ops;
struct ip_tunnel_net *itn;
err = register_netdev(ipn->fb_tunnel_dev);
err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
if (err)
goto err_reg_dev;
return 0;
err_reg_dev:
vti_dev_free(ipn->fb_tunnel_dev);
err_alloc_dev:
/* nothing */
return err;
itn = net_generic(net, vti_net_id);
vti_fb_tunnel_init(itn->fb_tunnel_dev);
return 0;
}
static void __net_exit vti_exit_net(struct net *net)
{
struct vti_net *ipn = net_generic(net, vti_net_id);
LIST_HEAD(list);
rtnl_lock();
vti_destroy_tunnels(ipn, &list);
unregister_netdevice_many(&list);
rtnl_unlock();
struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
ip_tunnel_delete_net(itn);
}
static struct pernet_operations vti_net_ops = {
.init = vti_init_net,
.exit = vti_exit_net,
.id = &vti_net_id,
.size = sizeof(struct vti_net),
.size = sizeof(struct ip_tunnel_net),
};
static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
......@@ -728,78 +363,19 @@ static void vti_netlink_parms(struct nlattr *data[],
static int vti_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
struct ip_tunnel *nt;
struct net *net = dev_net(dev);
struct vti_net *ipn = net_generic(net, vti_net_id);
int mtu;
int err;
nt = netdev_priv(dev);
vti_netlink_parms(data, &nt->parms);
if (vti_tunnel_locate(net, &nt->parms, 0))
return -EEXIST;
mtu = vti_tunnel_bind_dev(dev);
if (!tb[IFLA_MTU])
dev->mtu = mtu;
err = register_netdevice(dev);
if (err)
goto out;
dev_hold(dev);
vti_tunnel_link(ipn, nt);
struct ip_tunnel_parm parms;
out:
return err;
vti_netlink_parms(data, &parms);
return ip_tunnel_newlink(dev, tb, &parms);
}
static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[])
{
struct ip_tunnel *t, *nt;
struct net *net = dev_net(dev);
struct vti_net *ipn = net_generic(net, vti_net_id);
struct ip_tunnel_parm p;
int mtu;
if (dev == ipn->fb_tunnel_dev)
return -EINVAL;
nt = netdev_priv(dev);
vti_netlink_parms(data, &p);
t = vti_tunnel_locate(net, &p, 0);
if (t) {
if (t->dev != dev)
return -EEXIST;
} else {
t = nt;
vti_tunnel_unlink(ipn, t);
t->parms.iph.saddr = p.iph.saddr;
t->parms.iph.daddr = p.iph.daddr;
t->parms.i_key = p.i_key;
t->parms.o_key = p.o_key;
if (dev->type != ARPHRD_ETHER) {
memcpy(dev->dev_addr, &p.iph.saddr, 4);
memcpy(dev->broadcast, &p.iph.daddr, 4);
}
vti_tunnel_link(ipn, t);
netdev_state_change(dev);
}
if (t->parms.link != p.link) {
t->parms.link = p.link;
mtu = vti_tunnel_bind_dev(dev);
if (!tb[IFLA_MTU])
dev->mtu = mtu;
netdev_state_change(dev);
}
return 0;
return ip_tunnel_changelink(dev, tb, &p);
}
static size_t vti_get_size(const struct net_device *dev)
......@@ -865,7 +441,7 @@ static int __init vti_init(void)
err = xfrm4_mode_tunnel_input_register(&vti_handler);
if (err < 0) {
unregister_pernet_device(&vti_net_ops);
pr_info(KERN_INFO "vti init: can't register tunnel\n");
pr_info("vti init: can't register tunnel\n");
}
err = rtnl_link_register(&vti_link_ops);
......
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