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![Davide Caratti](/assets/img/avatar_default.png)
SCTP sockets originated in a VRF can improve their performance if CRC32c computation is delegated to underlying devices: update device features, setting NETIF_F_SCTP_CRC. Iterating the following command in the topology proposed with [1], # ip vrf exec vrf-h2 netperf -H 192.0.2.1 -t SCTP_STREAM -- -m 10K the measured throughput in Mbit/s improved from 2395 ± 1% to 2720 ± 1%. [1] https://www.spinics.net/lists/netdev/msg486007.html Signed-off-by: Davide Caratti <dcaratti@redhat.com> Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Acked-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1456 lines
33 KiB
C
1456 lines
33 KiB
C
/*
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* vrf.c: device driver to encapsulate a VRF space
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*
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* Copyright (c) 2015 Cumulus Networks. All rights reserved.
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* Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com>
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* Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
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*
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* Based on dummy, team and ipvlan drivers
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ip.h>
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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#include <linux/netfilter.h>
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#include <linux/rtnetlink.h>
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#include <net/rtnetlink.h>
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#include <linux/u64_stats_sync.h>
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#include <linux/hashtable.h>
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#include <linux/inetdevice.h>
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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/route.h>
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#include <net/addrconf.h>
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#include <net/l3mdev.h>
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#include <net/fib_rules.h>
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#include <net/netns/generic.h>
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#define DRV_NAME "vrf"
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#define DRV_VERSION "1.0"
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#define FIB_RULE_PREF 1000 /* default preference for FIB rules */
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static unsigned int vrf_net_id;
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struct net_vrf {
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struct rtable __rcu *rth;
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struct rt6_info __rcu *rt6;
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#if IS_ENABLED(CONFIG_IPV6)
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struct fib6_table *fib6_table;
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#endif
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u32 tb_id;
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};
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struct pcpu_dstats {
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u64 tx_pkts;
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u64 tx_bytes;
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u64 tx_drps;
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u64 rx_pkts;
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u64 rx_bytes;
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u64 rx_drps;
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struct u64_stats_sync syncp;
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};
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static void vrf_rx_stats(struct net_device *dev, int len)
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{
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struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
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u64_stats_update_begin(&dstats->syncp);
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dstats->rx_pkts++;
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dstats->rx_bytes += len;
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u64_stats_update_end(&dstats->syncp);
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}
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static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
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{
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vrf_dev->stats.tx_errors++;
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kfree_skb(skb);
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}
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static void vrf_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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int i;
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for_each_possible_cpu(i) {
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const struct pcpu_dstats *dstats;
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u64 tbytes, tpkts, tdrops, rbytes, rpkts;
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unsigned int start;
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dstats = per_cpu_ptr(dev->dstats, i);
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do {
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start = u64_stats_fetch_begin_irq(&dstats->syncp);
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tbytes = dstats->tx_bytes;
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tpkts = dstats->tx_pkts;
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tdrops = dstats->tx_drps;
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rbytes = dstats->rx_bytes;
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rpkts = dstats->rx_pkts;
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} while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
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stats->tx_bytes += tbytes;
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stats->tx_packets += tpkts;
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stats->tx_dropped += tdrops;
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stats->rx_bytes += rbytes;
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stats->rx_packets += rpkts;
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}
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}
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/* by default VRF devices do not have a qdisc and are expected
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* to be created with only a single queue.
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*/
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static bool qdisc_tx_is_default(const struct net_device *dev)
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{
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struct netdev_queue *txq;
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struct Qdisc *qdisc;
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if (dev->num_tx_queues > 1)
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return false;
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txq = netdev_get_tx_queue(dev, 0);
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qdisc = rcu_access_pointer(txq->qdisc);
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return !qdisc->enqueue;
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}
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/* Local traffic destined to local address. Reinsert the packet to rx
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* path, similar to loopback handling.
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*/
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static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
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struct dst_entry *dst)
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{
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int len = skb->len;
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skb_orphan(skb);
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skb_dst_set(skb, dst);
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/* set pkt_type to avoid skb hitting packet taps twice -
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* once on Tx and again in Rx processing
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*/
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skb->pkt_type = PACKET_LOOPBACK;
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skb->protocol = eth_type_trans(skb, dev);
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if (likely(netif_rx(skb) == NET_RX_SUCCESS))
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vrf_rx_stats(dev, len);
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else
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this_cpu_inc(dev->dstats->rx_drps);
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return NETDEV_TX_OK;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static int vrf_ip6_local_out(struct net *net, struct sock *sk,
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struct sk_buff *skb)
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{
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int err;
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err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
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sk, skb, NULL, skb_dst(skb)->dev, dst_output);
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if (likely(err == 1))
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err = dst_output(net, sk, skb);
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return err;
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}
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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_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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/* if dst.dev is loopback or the VRF device again this is locally
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* originated traffic destined to a local address. Short circuit
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* to Rx path
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*/
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if (dst->dev == dev)
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return vrf_local_xmit(skb, dev, dst);
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skb_dst_set(skb, dst);
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/* strip the ethernet header added for pass through VRF device */
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__skb_pull(skb, skb_network_offset(skb));
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ret = vrf_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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/* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
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static int vrf_ip_local_out(struct net *net, struct sock *sk,
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struct sk_buff *skb)
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{
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int err;
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err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
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skb, NULL, skb_dst(skb)->dev, dst_output);
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if (likely(err == 1))
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err = dst_output(net, sk, skb);
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return err;
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}
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static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
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struct net_device *vrf_dev)
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{
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struct iphdr *ip4h = ip_hdr(skb);
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int ret = NET_XMIT_DROP;
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struct flowi4 fl4 = {
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/* needed to match OIF rule */
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.flowi4_oif = vrf_dev->ifindex,
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.flowi4_iif = LOOPBACK_IFINDEX,
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.flowi4_tos = RT_TOS(ip4h->tos),
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.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF,
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.flowi4_proto = ip4h->protocol,
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.daddr = ip4h->daddr,
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.saddr = ip4h->saddr,
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};
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struct net *net = dev_net(vrf_dev);
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struct rtable *rt;
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rt = ip_route_output_flow(net, &fl4, NULL);
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if (IS_ERR(rt))
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goto err;
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skb_dst_drop(skb);
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/* if dst.dev is loopback or the VRF device again this is locally
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* originated traffic destined to a local address. Short circuit
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* to Rx path
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*/
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if (rt->dst.dev == vrf_dev)
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return vrf_local_xmit(skb, vrf_dev, &rt->dst);
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skb_dst_set(skb, &rt->dst);
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/* strip the ethernet header added for pass through VRF device */
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__skb_pull(skb, skb_network_offset(skb));
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if (!ip4h->saddr) {
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ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
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RT_SCOPE_LINK);
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}
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ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
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if (unlikely(net_xmit_eval(ret)))
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vrf_dev->stats.tx_errors++;
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else
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ret = NET_XMIT_SUCCESS;
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out:
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return ret;
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err:
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vrf_tx_error(vrf_dev, skb);
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goto out;
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}
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static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
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{
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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return vrf_process_v4_outbound(skb, dev);
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case htons(ETH_P_IPV6):
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return vrf_process_v6_outbound(skb, dev);
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default:
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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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}
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static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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int len = skb->len;
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netdev_tx_t ret = is_ip_tx_frame(skb, dev);
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if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
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struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
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u64_stats_update_begin(&dstats->syncp);
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dstats->tx_pkts++;
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dstats->tx_bytes += len;
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u64_stats_update_end(&dstats->syncp);
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} else {
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this_cpu_inc(dev->dstats->tx_drps);
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}
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return ret;
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}
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static int vrf_finish_direct(struct net *net, struct sock *sk,
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struct sk_buff *skb)
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{
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struct net_device *vrf_dev = skb->dev;
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if (!list_empty(&vrf_dev->ptype_all) &&
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likely(skb_headroom(skb) >= ETH_HLEN)) {
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struct ethhdr *eth = skb_push(skb, ETH_HLEN);
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ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
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eth_zero_addr(eth->h_dest);
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eth->h_proto = skb->protocol;
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rcu_read_lock_bh();
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dev_queue_xmit_nit(skb, vrf_dev);
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rcu_read_unlock_bh();
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skb_pull(skb, ETH_HLEN);
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}
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return 1;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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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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nf_reset(skb);
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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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sock_confirm_neigh(skb, neigh);
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ret = neigh_output(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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/* set dst on skb to send packet to us via dev_xmit path. Allows
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* packet to go through device based features such as qdisc, netfilter
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* hooks and packet sockets with skb->dev set to vrf device.
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*/
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static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev,
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struct sk_buff *skb)
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{
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struct net_vrf *vrf = netdev_priv(vrf_dev);
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struct dst_entry *dst = NULL;
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struct rt6_info *rt6;
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rcu_read_lock();
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rt6 = rcu_dereference(vrf->rt6);
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if (likely(rt6)) {
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dst = &rt6->dst;
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dst_hold(dst);
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}
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rcu_read_unlock();
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if (unlikely(!dst)) {
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vrf_tx_error(vrf_dev, skb);
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return NULL;
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}
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skb_dst_drop(skb);
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skb_dst_set(skb, dst);
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return skb;
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}
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static int vrf_output6_direct(struct net *net, struct sock *sk,
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struct sk_buff *skb)
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{
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skb->protocol = htons(ETH_P_IPV6);
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return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
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net, sk, skb, NULL, skb->dev,
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vrf_finish_direct,
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!(IPCB(skb)->flags & IPSKB_REROUTED));
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}
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static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev,
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struct sock *sk,
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struct sk_buff *skb)
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{
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struct net *net = dev_net(vrf_dev);
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int err;
|
|
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skb->dev = vrf_dev;
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err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk,
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skb, NULL, vrf_dev, vrf_output6_direct);
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if (likely(err == 1))
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err = vrf_output6_direct(net, sk, skb);
|
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|
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/* reset skb device */
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if (likely(err == 1))
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nf_reset(skb);
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else
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skb = NULL;
|
|
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return skb;
|
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}
|
|
|
|
static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
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struct sock *sk,
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|
struct sk_buff *skb)
|
|
{
|
|
/* don't divert link scope packets */
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|
if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
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return skb;
|
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|
|
if (qdisc_tx_is_default(vrf_dev))
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return vrf_ip6_out_direct(vrf_dev, sk, skb);
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return vrf_ip6_out_redirect(vrf_dev, skb);
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}
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|
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/* holding rtnl */
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static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
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|
{
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struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
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struct net *net = dev_net(dev);
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struct dst_entry *dst;
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|
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RCU_INIT_POINTER(vrf->rt6, NULL);
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synchronize_rcu();
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|
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/* move dev in dst's to loopback so this VRF device can be deleted
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* - based on dst_ifdown
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|
*/
|
|
if (rt6) {
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dst = &rt6->dst;
|
|
dev_put(dst->dev);
|
|
dst->dev = net->loopback_dev;
|
|
dev_hold(dst->dev);
|
|
dst_release(dst);
|
|
}
|
|
}
|
|
|
|
static int vrf_rt6_create(struct net_device *dev)
|
|
{
|
|
int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM;
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
struct net *net = dev_net(dev);
|
|
struct rt6_info *rt6;
|
|
int rc = -ENOMEM;
|
|
|
|
/* IPv6 can be CONFIG enabled and then disabled runtime */
|
|
if (!ipv6_mod_enabled())
|
|
return 0;
|
|
|
|
vrf->fib6_table = fib6_new_table(net, vrf->tb_id);
|
|
if (!vrf->fib6_table)
|
|
goto out;
|
|
|
|
/* create a dst for routing packets out a VRF device */
|
|
rt6 = ip6_dst_alloc(net, dev, flags);
|
|
if (!rt6)
|
|
goto out;
|
|
|
|
rt6->dst.output = vrf_output6;
|
|
|
|
rcu_assign_pointer(vrf->rt6, rt6);
|
|
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
}
|
|
#else
|
|
static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
|
|
struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
return skb;
|
|
}
|
|
|
|
static void vrf_rt6_release(struct net_device *dev, 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)
|
|
{
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
struct rtable *rt = (struct rtable *)dst;
|
|
struct net_device *dev = dst->dev;
|
|
unsigned int hh_len = LL_RESERVED_SPACE(dev);
|
|
struct neighbour *neigh;
|
|
u32 nexthop;
|
|
int ret = -EINVAL;
|
|
|
|
nf_reset(skb);
|
|
|
|
/* Be paranoid, rather than too clever. */
|
|
if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
|
|
struct sk_buff *skb2;
|
|
|
|
skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
|
|
if (!skb2) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
if (skb->sk)
|
|
skb_set_owner_w(skb2, skb->sk);
|
|
|
|
consume_skb(skb);
|
|
skb = skb2;
|
|
}
|
|
|
|
rcu_read_lock_bh();
|
|
|
|
nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
|
|
neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
|
|
if (unlikely(!neigh))
|
|
neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
|
|
if (!IS_ERR(neigh)) {
|
|
sock_confirm_neigh(skb, neigh);
|
|
ret = neigh_output(neigh, skb);
|
|
rcu_read_unlock_bh();
|
|
return ret;
|
|
}
|
|
|
|
rcu_read_unlock_bh();
|
|
err:
|
|
vrf_tx_error(skb->dev, skb);
|
|
return ret;
|
|
}
|
|
|
|
static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct net_device *dev = skb_dst(skb)->dev;
|
|
|
|
IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
|
|
|
|
skb->dev = dev;
|
|
skb->protocol = htons(ETH_P_IP);
|
|
|
|
return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
|
|
net, sk, skb, NULL, dev,
|
|
vrf_finish_output,
|
|
!(IPCB(skb)->flags & IPSKB_REROUTED));
|
|
}
|
|
|
|
/* set dst on skb to send packet to us via dev_xmit path. Allows
|
|
* packet to go through device based features such as qdisc, netfilter
|
|
* hooks and packet sockets with skb->dev set to vrf device.
|
|
*/
|
|
static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(vrf_dev);
|
|
struct dst_entry *dst = NULL;
|
|
struct rtable *rth;
|
|
|
|
rcu_read_lock();
|
|
|
|
rth = rcu_dereference(vrf->rth);
|
|
if (likely(rth)) {
|
|
dst = &rth->dst;
|
|
dst_hold(dst);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
if (unlikely(!dst)) {
|
|
vrf_tx_error(vrf_dev, skb);
|
|
return NULL;
|
|
}
|
|
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, dst);
|
|
|
|
return skb;
|
|
}
|
|
|
|
static int vrf_output_direct(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
skb->protocol = htons(ETH_P_IP);
|
|
|
|
return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
|
|
net, sk, skb, NULL, skb->dev,
|
|
vrf_finish_direct,
|
|
!(IPCB(skb)->flags & IPSKB_REROUTED));
|
|
}
|
|
|
|
static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
|
|
struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct net *net = dev_net(vrf_dev);
|
|
int err;
|
|
|
|
skb->dev = vrf_dev;
|
|
|
|
err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
|
|
skb, NULL, vrf_dev, vrf_output_direct);
|
|
|
|
if (likely(err == 1))
|
|
err = vrf_output_direct(net, sk, skb);
|
|
|
|
/* reset skb device */
|
|
if (likely(err == 1))
|
|
nf_reset(skb);
|
|
else
|
|
skb = NULL;
|
|
|
|
return skb;
|
|
}
|
|
|
|
static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
|
|
struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
/* don't divert multicast or local broadcast */
|
|
if (ipv4_is_multicast(ip_hdr(skb)->daddr) ||
|
|
ipv4_is_lbcast(ip_hdr(skb)->daddr))
|
|
return skb;
|
|
|
|
if (qdisc_tx_is_default(vrf_dev))
|
|
return vrf_ip_out_direct(vrf_dev, sk, skb);
|
|
|
|
return vrf_ip_out_redirect(vrf_dev, skb);
|
|
}
|
|
|
|
/* called with rcu lock held */
|
|
static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
|
|
struct sock *sk,
|
|
struct sk_buff *skb,
|
|
u16 proto)
|
|
{
|
|
switch (proto) {
|
|
case AF_INET:
|
|
return vrf_ip_out(vrf_dev, sk, skb);
|
|
case AF_INET6:
|
|
return vrf_ip6_out(vrf_dev, sk, skb);
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
/* holding rtnl */
|
|
static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
|
|
{
|
|
struct rtable *rth = rtnl_dereference(vrf->rth);
|
|
struct net *net = dev_net(dev);
|
|
struct dst_entry *dst;
|
|
|
|
RCU_INIT_POINTER(vrf->rth, NULL);
|
|
synchronize_rcu();
|
|
|
|
/* move dev in dst's to loopback so this VRF device can be deleted
|
|
* - based on dst_ifdown
|
|
*/
|
|
if (rth) {
|
|
dst = &rth->dst;
|
|
dev_put(dst->dev);
|
|
dst->dev = net->loopback_dev;
|
|
dev_hold(dst->dev);
|
|
dst_release(dst);
|
|
}
|
|
}
|
|
|
|
static int vrf_rtable_create(struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
struct rtable *rth;
|
|
|
|
if (!fib_new_table(dev_net(dev), vrf->tb_id))
|
|
return -ENOMEM;
|
|
|
|
/* create a dst for routing packets out through a VRF device */
|
|
rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0);
|
|
if (!rth)
|
|
return -ENOMEM;
|
|
|
|
rth->dst.output = vrf_output;
|
|
|
|
rcu_assign_pointer(vrf->rth, rth);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**************************** device handling ********************/
|
|
|
|
/* cycle interface to flush neighbor cache and move routes across tables */
|
|
static void cycle_netdev(struct net_device *dev)
|
|
{
|
|
unsigned int flags = dev->flags;
|
|
int ret;
|
|
|
|
if (!netif_running(dev))
|
|
return;
|
|
|
|
ret = dev_change_flags(dev, flags & ~IFF_UP);
|
|
if (ret >= 0)
|
|
ret = dev_change_flags(dev, flags);
|
|
|
|
if (ret < 0) {
|
|
netdev_err(dev,
|
|
"Failed to cycle device %s; route tables might be wrong!\n",
|
|
dev->name);
|
|
}
|
|
}
|
|
|
|
static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int ret;
|
|
|
|
/* do not allow loopback device to be enslaved to a VRF.
|
|
* The vrf device acts as the loopback for the vrf.
|
|
*/
|
|
if (port_dev == dev_net(dev)->loopback_dev) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Can not enslave loopback device to a VRF");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
|
|
ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
cycle_netdev(port_dev);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
|
|
return ret;
|
|
}
|
|
|
|
static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (netif_is_l3_master(port_dev)) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Can not enslave an L3 master device to a VRF");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (netif_is_l3_slave(port_dev))
|
|
return -EINVAL;
|
|
|
|
return do_vrf_add_slave(dev, port_dev, extack);
|
|
}
|
|
|
|
/* inverse of do_vrf_add_slave */
|
|
static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
|
|
{
|
|
netdev_upper_dev_unlink(port_dev, dev);
|
|
port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
|
|
|
|
cycle_netdev(port_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
|
|
{
|
|
return do_vrf_del_slave(dev, port_dev);
|
|
}
|
|
|
|
static void vrf_dev_uninit(struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
vrf_rtable_release(dev, vrf);
|
|
vrf_rt6_release(dev, vrf);
|
|
|
|
free_percpu(dev->dstats);
|
|
dev->dstats = NULL;
|
|
}
|
|
|
|
static int vrf_dev_init(struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
|
|
if (!dev->dstats)
|
|
goto out_nomem;
|
|
|
|
/* create the default dst which points back to us */
|
|
if (vrf_rtable_create(dev) != 0)
|
|
goto out_stats;
|
|
|
|
if (vrf_rt6_create(dev) != 0)
|
|
goto out_rth;
|
|
|
|
dev->flags = IFF_MASTER | IFF_NOARP;
|
|
|
|
/* MTU is irrelevant for VRF device; set to 64k similar to lo */
|
|
dev->mtu = 64 * 1024;
|
|
|
|
/* similarly, oper state is irrelevant; set to up to avoid confusion */
|
|
dev->operstate = IF_OPER_UP;
|
|
netdev_lockdep_set_classes(dev);
|
|
return 0;
|
|
|
|
out_rth:
|
|
vrf_rtable_release(dev, vrf);
|
|
out_stats:
|
|
free_percpu(dev->dstats);
|
|
dev->dstats = NULL;
|
|
out_nomem:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static const struct net_device_ops vrf_netdev_ops = {
|
|
.ndo_init = vrf_dev_init,
|
|
.ndo_uninit = vrf_dev_uninit,
|
|
.ndo_start_xmit = vrf_xmit,
|
|
.ndo_get_stats64 = vrf_get_stats64,
|
|
.ndo_add_slave = vrf_add_slave,
|
|
.ndo_del_slave = vrf_del_slave,
|
|
};
|
|
|
|
static u32 vrf_fib_table(const struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
return vrf->tb_id;
|
|
}
|
|
|
|
static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
|
|
struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1)
|
|
skb = NULL; /* kfree_skb(skb) handled by nf code */
|
|
|
|
return skb;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
/* 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.
|
|
*/
|
|
static bool ipv6_ndisc_frame(const struct sk_buff *skb)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
bool rc = false;
|
|
|
|
if (iph->nexthdr == NEXTHDR_ICMP) {
|
|
const struct icmp6hdr *icmph;
|
|
struct icmp6hdr _icmph;
|
|
|
|
icmph = skb_header_pointer(skb, sizeof(*iph),
|
|
sizeof(_icmph), &_icmph);
|
|
if (!icmph)
|
|
goto out;
|
|
|
|
switch (icmph->icmp6_type) {
|
|
case NDISC_ROUTER_SOLICITATION:
|
|
case NDISC_ROUTER_ADVERTISEMENT:
|
|
case NDISC_NEIGHBOUR_SOLICITATION:
|
|
case NDISC_NEIGHBOUR_ADVERTISEMENT:
|
|
case NDISC_REDIRECT:
|
|
rc = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
|
|
const struct net_device *dev,
|
|
struct flowi6 *fl6,
|
|
int ifindex,
|
|
const struct sk_buff *skb,
|
|
int flags)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags);
|
|
}
|
|
|
|
static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
|
|
int ifindex)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
struct flowi6 fl6 = {
|
|
.flowi6_iif = ifindex,
|
|
.flowi6_mark = skb->mark,
|
|
.flowi6_proto = iph->nexthdr,
|
|
.daddr = iph->daddr,
|
|
.saddr = iph->saddr,
|
|
.flowlabel = ip6_flowinfo(iph),
|
|
};
|
|
struct net *net = dev_net(vrf_dev);
|
|
struct rt6_info *rt6;
|
|
|
|
rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb,
|
|
RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
|
|
if (unlikely(!rt6))
|
|
return;
|
|
|
|
if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
|
|
return;
|
|
|
|
skb_dst_set(skb, &rt6->dst);
|
|
}
|
|
|
|
static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
int orig_iif = skb->skb_iif;
|
|
bool need_strict;
|
|
|
|
/* loopback traffic; do not push through packet taps again.
|
|
* Reset pkt_type for upper layers to process skb
|
|
*/
|
|
if (skb->pkt_type == PACKET_LOOPBACK) {
|
|
skb->dev = vrf_dev;
|
|
skb->skb_iif = vrf_dev->ifindex;
|
|
IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
|
|
skb->pkt_type = PACKET_HOST;
|
|
goto out;
|
|
}
|
|
|
|
/* if packet is NDISC or addressed to multicast or link-local
|
|
* then keep the ingress interface
|
|
*/
|
|
need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
|
|
if (!ipv6_ndisc_frame(skb) && !need_strict) {
|
|
vrf_rx_stats(vrf_dev, skb->len);
|
|
skb->dev = vrf_dev;
|
|
skb->skb_iif = vrf_dev->ifindex;
|
|
|
|
if (!list_empty(&vrf_dev->ptype_all)) {
|
|
skb_push(skb, skb->mac_len);
|
|
dev_queue_xmit_nit(skb, vrf_dev);
|
|
skb_pull(skb, skb->mac_len);
|
|
}
|
|
|
|
IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
|
|
}
|
|
|
|
if (need_strict)
|
|
vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
|
|
|
|
skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
|
|
out:
|
|
return skb;
|
|
}
|
|
|
|
#else
|
|
static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
return skb;
|
|
}
|
|
#endif
|
|
|
|
static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
skb->dev = vrf_dev;
|
|
skb->skb_iif = vrf_dev->ifindex;
|
|
IPCB(skb)->flags |= IPSKB_L3SLAVE;
|
|
|
|
if (ipv4_is_multicast(ip_hdr(skb)->daddr))
|
|
goto out;
|
|
|
|
/* loopback traffic; do not push through packet taps again.
|
|
* Reset pkt_type for upper layers to process skb
|
|
*/
|
|
if (skb->pkt_type == PACKET_LOOPBACK) {
|
|
skb->pkt_type = PACKET_HOST;
|
|
goto out;
|
|
}
|
|
|
|
vrf_rx_stats(vrf_dev, skb->len);
|
|
|
|
if (!list_empty(&vrf_dev->ptype_all)) {
|
|
skb_push(skb, skb->mac_len);
|
|
dev_queue_xmit_nit(skb, vrf_dev);
|
|
skb_pull(skb, skb->mac_len);
|
|
}
|
|
|
|
skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
|
|
out:
|
|
return skb;
|
|
}
|
|
|
|
/* called with rcu lock held */
|
|
static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
|
|
struct sk_buff *skb,
|
|
u16 proto)
|
|
{
|
|
switch (proto) {
|
|
case AF_INET:
|
|
return vrf_ip_rcv(vrf_dev, skb);
|
|
case AF_INET6:
|
|
return vrf_ip6_rcv(vrf_dev, skb);
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
/* send to link-local or multicast address via interface enslaved to
|
|
* VRF device. Force lookup to VRF table without changing flow struct
|
|
*/
|
|
static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
|
|
struct flowi6 *fl6)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
int flags = RT6_LOOKUP_F_IFACE;
|
|
struct dst_entry *dst = NULL;
|
|
struct rt6_info *rt;
|
|
|
|
/* VRF device does not have a link-local address and
|
|
* sending packets to link-local or mcast addresses over
|
|
* a VRF device does not make sense
|
|
*/
|
|
if (fl6->flowi6_oif == dev->ifindex) {
|
|
dst = &net->ipv6.ip6_null_entry->dst;
|
|
dst_hold(dst);
|
|
return dst;
|
|
}
|
|
|
|
if (!ipv6_addr_any(&fl6->saddr))
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
|
|
rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags);
|
|
if (rt)
|
|
dst = &rt->dst;
|
|
|
|
return dst;
|
|
}
|
|
#endif
|
|
|
|
static const struct l3mdev_ops vrf_l3mdev_ops = {
|
|
.l3mdev_fib_table = vrf_fib_table,
|
|
.l3mdev_l3_rcv = vrf_l3_rcv,
|
|
.l3mdev_l3_out = vrf_l3_out,
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
.l3mdev_link_scope_lookup = vrf_link_scope_lookup,
|
|
#endif
|
|
};
|
|
|
|
static void vrf_get_drvinfo(struct net_device *dev,
|
|
struct ethtool_drvinfo *info)
|
|
{
|
|
strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
|
|
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
|
|
}
|
|
|
|
static const struct ethtool_ops vrf_ethtool_ops = {
|
|
.get_drvinfo = vrf_get_drvinfo,
|
|
};
|
|
|
|
static inline size_t vrf_fib_rule_nl_size(void)
|
|
{
|
|
size_t sz;
|
|
|
|
sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
|
|
sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */
|
|
sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */
|
|
sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */
|
|
|
|
return sz;
|
|
}
|
|
|
|
static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
|
|
{
|
|
struct fib_rule_hdr *frh;
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if (family == AF_INET6 && !ipv6_mod_enabled())
|
|
return 0;
|
|
|
|
skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOMEM;
|
|
|
|
nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
/* rule only needs to appear once */
|
|
nlh->nlmsg_flags |= NLM_F_EXCL;
|
|
|
|
frh = nlmsg_data(nlh);
|
|
memset(frh, 0, sizeof(*frh));
|
|
frh->family = family;
|
|
frh->action = FR_ACT_TO_TBL;
|
|
|
|
if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u8(skb, FRA_L3MDEV, 1))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
|
|
/* fib_nl_{new,del}rule handling looks for net from skb->sk */
|
|
skb->sk = dev_net(dev)->rtnl;
|
|
if (add_it) {
|
|
err = fib_nl_newrule(skb, nlh, NULL);
|
|
if (err == -EEXIST)
|
|
err = 0;
|
|
} else {
|
|
err = fib_nl_delrule(skb, nlh, NULL);
|
|
if (err == -ENOENT)
|
|
err = 0;
|
|
}
|
|
nlmsg_free(skb);
|
|
|
|
return err;
|
|
|
|
nla_put_failure:
|
|
nlmsg_free(skb);
|
|
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int vrf_add_fib_rules(const struct net_device *dev)
|
|
{
|
|
int err;
|
|
|
|
err = vrf_fib_rule(dev, AF_INET, true);
|
|
if (err < 0)
|
|
goto out_err;
|
|
|
|
err = vrf_fib_rule(dev, AF_INET6, true);
|
|
if (err < 0)
|
|
goto ipv6_err;
|
|
|
|
#if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
|
|
err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true);
|
|
if (err < 0)
|
|
goto ipmr_err;
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
#if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
|
|
ipmr_err:
|
|
vrf_fib_rule(dev, AF_INET6, false);
|
|
#endif
|
|
|
|
ipv6_err:
|
|
vrf_fib_rule(dev, AF_INET, false);
|
|
|
|
out_err:
|
|
netdev_err(dev, "Failed to add FIB rules.\n");
|
|
return err;
|
|
}
|
|
|
|
static void vrf_setup(struct net_device *dev)
|
|
{
|
|
ether_setup(dev);
|
|
|
|
/* Initialize the device structure. */
|
|
dev->netdev_ops = &vrf_netdev_ops;
|
|
dev->l3mdev_ops = &vrf_l3mdev_ops;
|
|
dev->ethtool_ops = &vrf_ethtool_ops;
|
|
dev->needs_free_netdev = true;
|
|
|
|
/* Fill in device structure with ethernet-generic values. */
|
|
eth_hw_addr_random(dev);
|
|
|
|
/* don't acquire vrf device's netif_tx_lock when transmitting */
|
|
dev->features |= NETIF_F_LLTX;
|
|
|
|
/* don't allow vrf devices to change network namespaces. */
|
|
dev->features |= NETIF_F_NETNS_LOCAL;
|
|
|
|
/* does not make sense for a VLAN to be added to a vrf device */
|
|
dev->features |= NETIF_F_VLAN_CHALLENGED;
|
|
|
|
/* enable offload features */
|
|
dev->features |= NETIF_F_GSO_SOFTWARE;
|
|
dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC;
|
|
dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
|
|
|
|
dev->hw_features = dev->features;
|
|
dev->hw_enc_features = dev->features;
|
|
|
|
/* default to no qdisc; user can add if desired */
|
|
dev->priv_flags |= IFF_NO_QUEUE;
|
|
}
|
|
|
|
static int vrf_validate(struct nlattr *tb[], struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (tb[IFLA_ADDRESS]) {
|
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
|
|
NL_SET_ERR_MSG(extack, "Invalid hardware address");
|
|
return -EINVAL;
|
|
}
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
|
|
NL_SET_ERR_MSG(extack, "Invalid hardware address");
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void vrf_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
struct net_device *port_dev;
|
|
struct list_head *iter;
|
|
|
|
netdev_for_each_lower_dev(dev, port_dev, iter)
|
|
vrf_del_slave(dev, port_dev);
|
|
|
|
unregister_netdevice_queue(dev, head);
|
|
}
|
|
|
|
static int vrf_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
bool *add_fib_rules;
|
|
struct net *net;
|
|
int err;
|
|
|
|
if (!data || !data[IFLA_VRF_TABLE]) {
|
|
NL_SET_ERR_MSG(extack, "VRF table id is missing");
|
|
return -EINVAL;
|
|
}
|
|
|
|
vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
|
|
if (vrf->tb_id == RT_TABLE_UNSPEC) {
|
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE],
|
|
"Invalid VRF table id");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev->priv_flags |= IFF_L3MDEV_MASTER;
|
|
|
|
err = register_netdevice(dev);
|
|
if (err)
|
|
goto out;
|
|
|
|
net = dev_net(dev);
|
|
add_fib_rules = net_generic(net, vrf_net_id);
|
|
if (*add_fib_rules) {
|
|
err = vrf_add_fib_rules(dev);
|
|
if (err) {
|
|
unregister_netdevice(dev);
|
|
goto out;
|
|
}
|
|
*add_fib_rules = false;
|
|
}
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static size_t vrf_nl_getsize(const struct net_device *dev)
|
|
{
|
|
return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */
|
|
}
|
|
|
|
static int vrf_fillinfo(struct sk_buff *skb,
|
|
const struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
|
|
}
|
|
|
|
static size_t vrf_get_slave_size(const struct net_device *bond_dev,
|
|
const struct net_device *slave_dev)
|
|
{
|
|
return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */
|
|
}
|
|
|
|
static int vrf_fill_slave_info(struct sk_buff *skb,
|
|
const struct net_device *vrf_dev,
|
|
const struct net_device *slave_dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(vrf_dev);
|
|
|
|
if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
|
|
[IFLA_VRF_TABLE] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static struct rtnl_link_ops vrf_link_ops __read_mostly = {
|
|
.kind = DRV_NAME,
|
|
.priv_size = sizeof(struct net_vrf),
|
|
|
|
.get_size = vrf_nl_getsize,
|
|
.policy = vrf_nl_policy,
|
|
.validate = vrf_validate,
|
|
.fill_info = vrf_fillinfo,
|
|
|
|
.get_slave_size = vrf_get_slave_size,
|
|
.fill_slave_info = vrf_fill_slave_info,
|
|
|
|
.newlink = vrf_newlink,
|
|
.dellink = vrf_dellink,
|
|
.setup = vrf_setup,
|
|
.maxtype = IFLA_VRF_MAX,
|
|
};
|
|
|
|
static int vrf_device_event(struct notifier_block *unused,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
|
|
/* only care about unregister events to drop slave references */
|
|
if (event == NETDEV_UNREGISTER) {
|
|
struct net_device *vrf_dev;
|
|
|
|
if (!netif_is_l3_slave(dev))
|
|
goto out;
|
|
|
|
vrf_dev = netdev_master_upper_dev_get(dev);
|
|
vrf_del_slave(vrf_dev, dev);
|
|
}
|
|
out:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block vrf_notifier_block __read_mostly = {
|
|
.notifier_call = vrf_device_event,
|
|
};
|
|
|
|
/* Initialize per network namespace state */
|
|
static int __net_init vrf_netns_init(struct net *net)
|
|
{
|
|
bool *add_fib_rules = net_generic(net, vrf_net_id);
|
|
|
|
*add_fib_rules = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct pernet_operations vrf_net_ops __net_initdata = {
|
|
.init = vrf_netns_init,
|
|
.id = &vrf_net_id,
|
|
.size = sizeof(bool),
|
|
};
|
|
|
|
static int __init vrf_init_module(void)
|
|
{
|
|
int rc;
|
|
|
|
register_netdevice_notifier(&vrf_notifier_block);
|
|
|
|
rc = register_pernet_subsys(&vrf_net_ops);
|
|
if (rc < 0)
|
|
goto error;
|
|
|
|
rc = rtnl_link_register(&vrf_link_ops);
|
|
if (rc < 0) {
|
|
unregister_pernet_subsys(&vrf_net_ops);
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
unregister_netdevice_notifier(&vrf_notifier_block);
|
|
return rc;
|
|
}
|
|
|
|
module_init(vrf_init_module);
|
|
MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
|
|
MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_RTNL_LINK(DRV_NAME);
|
|
MODULE_VERSION(DRV_VERSION);
|