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