mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
net: Add IPv6 support to VRF device
Add support for IPv6 to VRF device driver. Implemenation parallels what has been done for IPv4. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
David S. Miller
parent
c485068778
commit
35402e3136
2 changed files with 275 additions and 2 deletions
|
|
@ -298,8 +298,10 @@ config NLMON
|
|||
|
||||
config NET_VRF
|
||||
tristate "Virtual Routing and Forwarding (Lite)"
|
||||
depends on IP_MULTIPLE_TABLES && IPV6_MULTIPLE_TABLES
|
||||
depends on IP_MULTIPLE_TABLES
|
||||
depends on NET_L3_MASTER_DEV
|
||||
depends on IPV6 || IPV6=n
|
||||
depends on IPV6_MULTIPLE_TABLES || IPV6=n
|
||||
---help---
|
||||
This option enables the support for mapping interfaces into VRF's. The
|
||||
support enables VRF devices.
|
||||
|
|
|
|||
|
|
@ -30,6 +30,7 @@
|
|||
#include <net/arp.h>
|
||||
#include <net/ip.h>
|
||||
#include <net/ip_fib.h>
|
||||
#include <net/ip6_fib.h>
|
||||
#include <net/ip6_route.h>
|
||||
#include <net/rtnetlink.h>
|
||||
#include <net/route.h>
|
||||
|
|
@ -57,6 +58,7 @@ struct slave_queue {
|
|||
struct net_vrf {
|
||||
struct slave_queue queue;
|
||||
struct rtable *rth;
|
||||
struct rt6_info *rt6;
|
||||
u32 tb_id;
|
||||
};
|
||||
|
||||
|
|
@ -104,12 +106,56 @@ static struct dst_ops vrf_dst_ops = {
|
|||
.default_advmss = vrf_default_advmss,
|
||||
};
|
||||
|
||||
/* neighbor handling is done with actual device; do not want
|
||||
* to flip skb->dev for those ndisc packets. This really fails
|
||||
* for multiple next protocols (e.g., NEXTHDR_HOP). But it is
|
||||
* a start.
|
||||
*/
|
||||
#if IS_ENABLED(CONFIG_IPV6)
|
||||
static bool check_ipv6_frame(const struct sk_buff *skb)
|
||||
{
|
||||
const struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb->data;
|
||||
size_t hlen = sizeof(*ipv6h);
|
||||
bool rc = true;
|
||||
|
||||
if (skb->len < hlen)
|
||||
goto out;
|
||||
|
||||
if (ipv6h->nexthdr == NEXTHDR_ICMP) {
|
||||
const struct icmp6hdr *icmph;
|
||||
|
||||
if (skb->len < hlen + sizeof(*icmph))
|
||||
goto out;
|
||||
|
||||
icmph = (struct icmp6hdr *)(skb->data + sizeof(*ipv6h));
|
||||
switch (icmph->icmp6_type) {
|
||||
case NDISC_ROUTER_SOLICITATION:
|
||||
case NDISC_ROUTER_ADVERTISEMENT:
|
||||
case NDISC_NEIGHBOUR_SOLICITATION:
|
||||
case NDISC_NEIGHBOUR_ADVERTISEMENT:
|
||||
case NDISC_REDIRECT:
|
||||
rc = false;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
#else
|
||||
static bool check_ipv6_frame(const struct sk_buff *skb)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
#endif
|
||||
|
||||
static bool is_ip_rx_frame(struct sk_buff *skb)
|
||||
{
|
||||
switch (skb->protocol) {
|
||||
case htons(ETH_P_IP):
|
||||
case htons(ETH_P_IPV6):
|
||||
return true;
|
||||
case htons(ETH_P_IPV6):
|
||||
return check_ipv6_frame(skb);
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
|
@ -169,12 +215,53 @@ static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev,
|
|||
return stats;
|
||||
}
|
||||
|
||||
#if IS_ENABLED(CONFIG_IPV6)
|
||||
static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
|
||||
struct net_device *dev)
|
||||
{
|
||||
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
||||
struct net *net = dev_net(skb->dev);
|
||||
struct flowi6 fl6 = {
|
||||
/* needed to match OIF rule */
|
||||
.flowi6_oif = dev->ifindex,
|
||||
.flowi6_iif = LOOPBACK_IFINDEX,
|
||||
.daddr = iph->daddr,
|
||||
.saddr = iph->saddr,
|
||||
.flowlabel = ip6_flowinfo(iph),
|
||||
.flowi6_mark = skb->mark,
|
||||
.flowi6_proto = iph->nexthdr,
|
||||
.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF,
|
||||
};
|
||||
int ret = NET_XMIT_DROP;
|
||||
struct dst_entry *dst;
|
||||
struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
|
||||
|
||||
dst = ip6_route_output(net, NULL, &fl6);
|
||||
if (dst == dst_null)
|
||||
goto err;
|
||||
|
||||
skb_dst_drop(skb);
|
||||
skb_dst_set(skb, dst);
|
||||
|
||||
ret = ip6_local_out(net, skb->sk, skb);
|
||||
if (unlikely(net_xmit_eval(ret)))
|
||||
dev->stats.tx_errors++;
|
||||
else
|
||||
ret = NET_XMIT_SUCCESS;
|
||||
|
||||
return ret;
|
||||
err:
|
||||
vrf_tx_error(dev, skb);
|
||||
return NET_XMIT_DROP;
|
||||
}
|
||||
#else
|
||||
static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
|
||||
struct net_device *dev)
|
||||
{
|
||||
vrf_tx_error(dev, skb);
|
||||
return NET_XMIT_DROP;
|
||||
}
|
||||
#endif
|
||||
|
||||
static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4,
|
||||
struct net_device *vrf_dev)
|
||||
|
|
@ -269,6 +356,157 @@ static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
|
|||
return ret;
|
||||
}
|
||||
|
||||
#if IS_ENABLED(CONFIG_IPV6)
|
||||
static struct dst_entry *vrf_ip6_check(struct dst_entry *dst, u32 cookie)
|
||||
{
|
||||
return dst;
|
||||
}
|
||||
|
||||
static struct dst_ops vrf_dst_ops6 = {
|
||||
.family = AF_INET6,
|
||||
.local_out = ip6_local_out,
|
||||
.check = vrf_ip6_check,
|
||||
.mtu = vrf_v4_mtu,
|
||||
.destroy = vrf_dst_destroy,
|
||||
.default_advmss = vrf_default_advmss,
|
||||
};
|
||||
|
||||
static int init_dst_ops6_kmem_cachep(void)
|
||||
{
|
||||
vrf_dst_ops6.kmem_cachep = kmem_cache_create("vrf_ip6_dst_cache",
|
||||
sizeof(struct rt6_info),
|
||||
0,
|
||||
SLAB_HWCACHE_ALIGN,
|
||||
NULL);
|
||||
|
||||
if (!vrf_dst_ops6.kmem_cachep)
|
||||
return -ENOMEM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void free_dst_ops6_kmem_cachep(void)
|
||||
{
|
||||
kmem_cache_destroy(vrf_dst_ops6.kmem_cachep);
|
||||
}
|
||||
|
||||
static int vrf_input6(struct sk_buff *skb)
|
||||
{
|
||||
skb->dev->stats.rx_errors++;
|
||||
kfree_skb(skb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* modelled after ip6_finish_output2 */
|
||||
static int vrf_finish_output6(struct net *net, struct sock *sk,
|
||||
struct sk_buff *skb)
|
||||
{
|
||||
struct dst_entry *dst = skb_dst(skb);
|
||||
struct net_device *dev = dst->dev;
|
||||
struct neighbour *neigh;
|
||||
struct in6_addr *nexthop;
|
||||
int ret;
|
||||
|
||||
skb->protocol = htons(ETH_P_IPV6);
|
||||
skb->dev = dev;
|
||||
|
||||
rcu_read_lock_bh();
|
||||
nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
|
||||
neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
|
||||
if (unlikely(!neigh))
|
||||
neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
|
||||
if (!IS_ERR(neigh)) {
|
||||
ret = dst_neigh_output(dst, neigh, skb);
|
||||
rcu_read_unlock_bh();
|
||||
return ret;
|
||||
}
|
||||
rcu_read_unlock_bh();
|
||||
|
||||
IP6_INC_STATS(dev_net(dst->dev),
|
||||
ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
|
||||
kfree_skb(skb);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* modelled after ip6_output */
|
||||
static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
|
||||
{
|
||||
return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
|
||||
net, sk, skb, NULL, skb_dst(skb)->dev,
|
||||
vrf_finish_output6,
|
||||
!(IP6CB(skb)->flags & IP6SKB_REROUTED));
|
||||
}
|
||||
|
||||
static void vrf_rt6_destroy(struct net_vrf *vrf)
|
||||
{
|
||||
dst_destroy(&vrf->rt6->dst);
|
||||
free_percpu(vrf->rt6->rt6i_pcpu);
|
||||
vrf->rt6 = NULL;
|
||||
}
|
||||
|
||||
static int vrf_rt6_create(struct net_device *dev)
|
||||
{
|
||||
struct net_vrf *vrf = netdev_priv(dev);
|
||||
struct dst_entry *dst;
|
||||
struct rt6_info *rt6;
|
||||
int cpu;
|
||||
int rc = -ENOMEM;
|
||||
|
||||
rt6 = dst_alloc(&vrf_dst_ops6, dev, 0,
|
||||
DST_OBSOLETE_NONE,
|
||||
(DST_HOST | DST_NOPOLICY | DST_NOXFRM));
|
||||
if (!rt6)
|
||||
goto out;
|
||||
|
||||
dst = &rt6->dst;
|
||||
|
||||
rt6->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_KERNEL);
|
||||
if (!rt6->rt6i_pcpu) {
|
||||
dst_destroy(dst);
|
||||
goto out;
|
||||
}
|
||||
for_each_possible_cpu(cpu) {
|
||||
struct rt6_info **p = per_cpu_ptr(rt6->rt6i_pcpu, cpu);
|
||||
*p = NULL;
|
||||
}
|
||||
|
||||
memset(dst + 1, 0, sizeof(*rt6) - sizeof(*dst));
|
||||
|
||||
INIT_LIST_HEAD(&rt6->rt6i_siblings);
|
||||
INIT_LIST_HEAD(&rt6->rt6i_uncached);
|
||||
|
||||
rt6->dst.input = vrf_input6;
|
||||
rt6->dst.output = vrf_output6;
|
||||
|
||||
rt6->rt6i_table = fib6_get_table(dev_net(dev), vrf->tb_id);
|
||||
|
||||
atomic_set(&rt6->dst.__refcnt, 2);
|
||||
|
||||
vrf->rt6 = rt6;
|
||||
rc = 0;
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
#else
|
||||
static int init_dst_ops6_kmem_cachep(void)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void free_dst_ops6_kmem_cachep(void)
|
||||
{
|
||||
}
|
||||
|
||||
static void vrf_rt6_destroy(struct net_vrf *vrf)
|
||||
{
|
||||
}
|
||||
|
||||
static int vrf_rt6_create(struct net_device *dev)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* modelled after ip_finish_output2 */
|
||||
static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
||||
{
|
||||
|
|
@ -490,6 +728,7 @@ static void vrf_dev_uninit(struct net_device *dev)
|
|||
struct slave *slave, *next;
|
||||
|
||||
vrf_rtable_destroy(vrf);
|
||||
vrf_rt6_destroy(vrf);
|
||||
|
||||
list_for_each_entry_safe(slave, next, head, list)
|
||||
vrf_del_slave(dev, slave->dev);
|
||||
|
|
@ -513,10 +752,15 @@ static int vrf_dev_init(struct net_device *dev)
|
|||
if (!vrf->rth)
|
||||
goto out_stats;
|
||||
|
||||
if (vrf_rt6_create(dev) != 0)
|
||||
goto out_rth;
|
||||
|
||||
dev->flags = IFF_MASTER | IFF_NOARP;
|
||||
|
||||
return 0;
|
||||
|
||||
out_rth:
|
||||
vrf_rtable_destroy(vrf);
|
||||
out_stats:
|
||||
free_percpu(dev->dstats);
|
||||
dev->dstats = NULL;
|
||||
|
|
@ -586,10 +830,30 @@ static void vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4)
|
|||
fl4->flowi4_scope = scope;
|
||||
}
|
||||
|
||||
#if IS_ENABLED(CONFIG_IPV6)
|
||||
static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev,
|
||||
const struct flowi6 *fl6)
|
||||
{
|
||||
struct rt6_info *rt = NULL;
|
||||
|
||||
if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) {
|
||||
struct net_vrf *vrf = netdev_priv(dev);
|
||||
|
||||
rt = vrf->rt6;
|
||||
atomic_inc(&rt->dst.__refcnt);
|
||||
}
|
||||
|
||||
return (struct dst_entry *)rt;
|
||||
}
|
||||
#endif
|
||||
|
||||
static const struct l3mdev_ops vrf_l3mdev_ops = {
|
||||
.l3mdev_fib_table = vrf_fib_table,
|
||||
.l3mdev_get_rtable = vrf_get_rtable,
|
||||
.l3mdev_get_saddr = vrf_get_saddr,
|
||||
#if IS_ENABLED(CONFIG_IPV6)
|
||||
.l3mdev_get_rt6_dst = vrf_get_rt6_dst,
|
||||
#endif
|
||||
};
|
||||
|
||||
static void vrf_get_drvinfo(struct net_device *dev,
|
||||
|
|
@ -731,6 +995,10 @@ static int __init vrf_init_module(void)
|
|||
if (!vrf_dst_ops.kmem_cachep)
|
||||
return -ENOMEM;
|
||||
|
||||
rc = init_dst_ops6_kmem_cachep();
|
||||
if (rc != 0)
|
||||
goto error2;
|
||||
|
||||
register_netdevice_notifier(&vrf_notifier_block);
|
||||
|
||||
rc = rtnl_link_register(&vrf_link_ops);
|
||||
|
|
@ -741,6 +1009,8 @@ static int __init vrf_init_module(void)
|
|||
|
||||
error:
|
||||
unregister_netdevice_notifier(&vrf_notifier_block);
|
||||
free_dst_ops6_kmem_cachep();
|
||||
error2:
|
||||
kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
|
||||
return rc;
|
||||
}
|
||||
|
|
@ -750,6 +1020,7 @@ static void __exit vrf_cleanup_module(void)
|
|||
rtnl_link_unregister(&vrf_link_ops);
|
||||
unregister_netdevice_notifier(&vrf_notifier_block);
|
||||
kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
|
||||
free_dst_ops6_kmem_cachep();
|
||||
}
|
||||
|
||||
module_init(vrf_init_module);
|
||||
|
|
|
|||
Loading…
Reference in a new issue