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vti6: Support inter address family tunneling.

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With this patch we can tunnel ipv4 traffic via a vti6
interface. A vti6 interface can now have an ipv4 address
and ipv4 traffic can be routed via a vti6 interface.
The resulting traffic is xfrm transformed and tunneled
through ipv6 if matching IPsec policies and states are
present.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2014-03-14 07:28:08 +01:00
parent 573ce1c11b
commit 22e1b23daf
1 changed files with 34 additions and 15 deletions
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49
net/ipv6/ip6_vti.c
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@ -380,30 +380,22 @@ vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
* vti6_xmit - send a packet
* @skb: the outgoing socket buffer
* @dev: the outgoing tunnel device
* @fl: the flow informations for the xfrm_lookup
**/
static int vti6_xmit(struct sk_buff *skb, struct net_device *dev)
static int
vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
{
struct ip6_tnl *t = netdev_priv(dev);
struct net_device_stats *stats = &t->dev->stats;
struct dst_entry *dst = skb_dst(skb);
struct flowi fl;
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
struct net_device *tdev;
int err = -1;
if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
!ip6_tnl_xmit_ctl(t) || vti6_addr_conflict(t, ipv6h))
return err;
memset(&fl, 0, sizeof(fl));
skb->mark = be32_to_cpu(t->parms.o_key);
xfrm_decode_session(skb, &fl, AF_INET6);
if (!dst)
goto tx_err_link_failure;
dst_hold(dst);
dst = xfrm_lookup(t->net, dst, &fl, NULL, 0);
dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
if (IS_ERR(dst)) {
err = PTR_ERR(dst);
dst = NULL;
@ -422,12 +414,22 @@ static int vti6_xmit(struct sk_buff *skb, struct net_device *dev)
goto tx_err_dst_release;
}
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
skb_dst_set(skb, dst);
skb->dev = skb_dst(skb)->dev;
ip6tunnel_xmit(skb, dev);
err = dst_output(skb);
if (net_xmit_eval(err) == 0) {
struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
u64_stats_update_begin(&tstats->syncp);
tstats->tx_bytes += skb->len;
tstats->tx_packets++;
u64_stats_update_end(&tstats->syncp);
} else {
stats->tx_errors++;
stats->tx_aborted_errors++;
}
return 0;
tx_err_link_failure:
@ -443,16 +445,33 @@ vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ip6_tnl *t = netdev_priv(dev);
struct net_device_stats *stats = &t->dev->stats;
struct ipv6hdr *ipv6h;
struct flowi fl;
int ret;
memset(&fl, 0, sizeof(fl));
skb->mark = be32_to_cpu(t->parms.o_key);
switch (skb->protocol) {
case htons(ETH_P_IPV6):
ret = vti6_xmit(skb, dev);
ipv6h = ipv6_hdr(skb);
if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
!ip6_tnl_xmit_ctl(t) || vti6_addr_conflict(t, ipv6h))
goto tx_err;
xfrm_decode_session(skb, &fl, AF_INET6);
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
break;
case htons(ETH_P_IP):
xfrm_decode_session(skb, &fl, AF_INET);
memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
break;
default:
goto tx_err;
}
ret = vti6_xmit(skb, dev, &fl);
if (ret < 0)
goto tx_err;