![David Ahern](/assets/img/avatar_default.png)
Move remaining structs to VRF driver and delete the vrf header file. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
730 lines
16 KiB
C
730 lines
16 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_route.h>
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#include <net/rtnetlink.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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#define DRV_NAME "vrf"
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#define DRV_VERSION "1.0"
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#define vrf_is_slave(dev) ((dev)->flags & IFF_SLAVE)
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#define vrf_master_get_rcu(dev) \
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((struct net_device *)rcu_dereference(dev->rx_handler_data))
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struct slave {
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struct list_head list;
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struct net_device *dev;
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};
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struct slave_queue {
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struct list_head all_slaves;
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};
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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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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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struct u64_stats_sync syncp;
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};
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static struct dst_entry *vrf_ip_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 int vrf_ip_local_out(struct sk_buff *skb)
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{
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return ip_local_out(skb);
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}
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static unsigned int vrf_v4_mtu(const struct dst_entry *dst)
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{
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/* TO-DO: return max ethernet size? */
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return dst->dev->mtu;
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}
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static void vrf_dst_destroy(struct dst_entry *dst)
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{
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/* our dst lives forever - or until the device is closed */
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}
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static unsigned int vrf_default_advmss(const struct dst_entry *dst)
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{
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return 65535 - 40;
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}
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static struct dst_ops vrf_dst_ops = {
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.family = AF_INET,
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.local_out = vrf_ip_local_out,
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.check = vrf_ip_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 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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}
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return false;
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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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/* note: already called with rcu_read_lock */
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static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb)
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{
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struct sk_buff *skb = *pskb;
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if (is_ip_rx_frame(skb)) {
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struct net_device *dev = vrf_master_get_rcu(skb->dev);
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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 += skb->len;
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u64_stats_update_end(&dstats->syncp);
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skb->dev = dev;
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return RX_HANDLER_ANOTHER;
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}
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return RX_HANDLER_PASS;
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}
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static struct rtnl_link_stats64 *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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return stats;
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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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vrf_tx_error(dev, skb);
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return NET_XMIT_DROP;
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}
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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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{
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struct rtable *rt;
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int err = 1;
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rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL);
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if (IS_ERR(rt))
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goto out;
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/* TO-DO: what about broadcast ? */
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if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
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ip_rt_put(rt);
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goto out;
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}
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skb_dst_drop(skb);
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skb_dst_set(skb, &rt->dst);
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err = 0;
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out:
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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_VRFSRC |
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FLOWI_FLAG_SKIP_NH_OIF,
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.daddr = ip4h->daddr,
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};
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if (vrf_send_v4_prep(skb, &fl4, vrf_dev))
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goto err;
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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 = ip_local_out(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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/* 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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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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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 += skb->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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/* 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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struct dst_entry *dst = skb_dst(skb);
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struct rtable *rt = (struct rtable *)dst;
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struct net_device *dev = dst->dev;
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unsigned int hh_len = LL_RESERVED_SPACE(dev);
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struct neighbour *neigh;
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u32 nexthop;
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int ret = -EINVAL;
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/* Be paranoid, rather than too clever. */
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if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
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struct sk_buff *skb2;
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skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
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if (!skb2) {
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ret = -ENOMEM;
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goto err;
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}
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if (skb->sk)
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skb_set_owner_w(skb2, skb->sk);
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consume_skb(skb);
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skb = skb2;
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}
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rcu_read_lock_bh();
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nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
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neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
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if (unlikely(!neigh))
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neigh = __neigh_create(&arp_tbl, &nexthop, 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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err:
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if (unlikely(ret < 0))
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vrf_tx_error(skb->dev, skb);
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return ret;
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}
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static int vrf_output(struct sock *sk, struct sk_buff *skb)
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{
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struct net_device *dev = skb_dst(skb)->dev;
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struct net *net = dev_net(dev);
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IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
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skb->dev = dev;
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skb->protocol = htons(ETH_P_IP);
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return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
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net, sk, skb, NULL, dev,
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vrf_finish_output,
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!(IPCB(skb)->flags & IPSKB_REROUTED));
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}
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static void vrf_rtable_destroy(struct net_vrf *vrf)
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{
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struct dst_entry *dst = (struct dst_entry *)vrf->rth;
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dst_destroy(dst);
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vrf->rth = NULL;
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}
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static struct rtable *vrf_rtable_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 rtable *rth;
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rth = dst_alloc(&vrf_dst_ops, dev, 2,
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DST_OBSOLETE_NONE,
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(DST_HOST | DST_NOPOLICY | DST_NOXFRM));
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if (rth) {
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rth->dst.output = vrf_output;
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rth->rt_genid = rt_genid_ipv4(dev_net(dev));
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rth->rt_flags = 0;
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rth->rt_type = RTN_UNICAST;
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rth->rt_is_input = 0;
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rth->rt_iif = 0;
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rth->rt_pmtu = 0;
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rth->rt_gateway = 0;
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rth->rt_uses_gateway = 0;
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rth->rt_table_id = vrf->tb_id;
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INIT_LIST_HEAD(&rth->rt_uncached);
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rth->rt_uncached_list = NULL;
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}
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return rth;
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}
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/**************************** device handling ********************/
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/* cycle interface to flush neighbor cache and move routes across tables */
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static void cycle_netdev(struct net_device *dev)
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{
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unsigned int flags = dev->flags;
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int ret;
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if (!netif_running(dev))
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return;
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ret = dev_change_flags(dev, flags & ~IFF_UP);
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if (ret >= 0)
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ret = dev_change_flags(dev, flags);
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if (ret < 0) {
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netdev_err(dev,
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"Failed to cycle device %s; route tables might be wrong!\n",
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dev->name);
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}
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}
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static struct slave *__vrf_find_slave_dev(struct slave_queue *queue,
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struct net_device *dev)
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{
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struct list_head *head = &queue->all_slaves;
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struct slave *slave;
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list_for_each_entry(slave, head, list) {
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if (slave->dev == dev)
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return slave;
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}
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return NULL;
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}
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/* inverse of __vrf_insert_slave */
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static void __vrf_remove_slave(struct slave_queue *queue, struct slave *slave)
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{
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list_del(&slave->list);
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}
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static void __vrf_insert_slave(struct slave_queue *queue, struct slave *slave)
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{
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list_add(&slave->list, &queue->all_slaves);
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}
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static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
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{
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struct slave *slave = kzalloc(sizeof(*slave), GFP_KERNEL);
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struct net_vrf *vrf = netdev_priv(dev);
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struct slave_queue *queue = &vrf->queue;
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int ret = -ENOMEM;
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if (!slave)
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goto out_fail;
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slave->dev = port_dev;
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/* register the packet handler for slave ports */
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ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev);
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if (ret) {
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netdev_err(port_dev,
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"Device %s failed to register rx_handler\n",
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port_dev->name);
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goto out_fail;
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}
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ret = netdev_master_upper_dev_link(port_dev, dev);
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if (ret < 0)
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goto out_unregister;
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port_dev->flags |= IFF_SLAVE;
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__vrf_insert_slave(queue, slave);
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cycle_netdev(port_dev);
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return 0;
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out_unregister:
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netdev_rx_handler_unregister(port_dev);
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out_fail:
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kfree(slave);
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return ret;
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}
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static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
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{
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if (netif_is_l3_master(port_dev) || vrf_is_slave(port_dev))
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return -EINVAL;
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return do_vrf_add_slave(dev, port_dev);
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}
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/* inverse of do_vrf_add_slave */
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static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
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{
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struct net_vrf *vrf = netdev_priv(dev);
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struct slave_queue *queue = &vrf->queue;
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struct slave *slave;
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netdev_upper_dev_unlink(port_dev, dev);
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port_dev->flags &= ~IFF_SLAVE;
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netdev_rx_handler_unregister(port_dev);
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cycle_netdev(port_dev);
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slave = __vrf_find_slave_dev(queue, port_dev);
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if (slave)
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__vrf_remove_slave(queue, slave);
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kfree(slave);
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return 0;
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}
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static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
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{
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return do_vrf_del_slave(dev, port_dev);
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}
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static void vrf_dev_uninit(struct net_device *dev)
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{
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struct net_vrf *vrf = netdev_priv(dev);
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struct slave_queue *queue = &vrf->queue;
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struct list_head *head = &queue->all_slaves;
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struct slave *slave, *next;
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vrf_rtable_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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free_percpu(dev->dstats);
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dev->dstats = NULL;
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}
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static int vrf_dev_init(struct net_device *dev)
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{
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struct net_vrf *vrf = netdev_priv(dev);
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INIT_LIST_HEAD(&vrf->queue.all_slaves);
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dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
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if (!dev->dstats)
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goto out_nomem;
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/* create the default dst which points back to us */
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vrf->rth = vrf_rtable_create(dev);
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if (!vrf->rth)
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goto out_stats;
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dev->flags = IFF_MASTER | IFF_NOARP;
|
|
|
|
return 0;
|
|
|
|
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 struct rtable *vrf_get_rtable(const struct net_device *dev,
|
|
const struct flowi4 *fl4)
|
|
{
|
|
struct rtable *rth = NULL;
|
|
|
|
if (!(fl4->flowi4_flags & FLOWI_FLAG_VRFSRC)) {
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
rth = vrf->rth;
|
|
atomic_inc(&rth->dst.__refcnt);
|
|
}
|
|
|
|
return rth;
|
|
}
|
|
|
|
static const struct l3mdev_ops vrf_l3mdev_ops = {
|
|
.l3mdev_fib_table = vrf_fib_table,
|
|
.l3mdev_get_rtable = vrf_get_rtable,
|
|
};
|
|
|
|
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 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->destructor = free_netdev;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
static int vrf_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
if (tb[IFLA_ADDRESS]) {
|
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
|
|
return -EINVAL;
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void vrf_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
unregister_netdevice_queue(dev, head);
|
|
}
|
|
|
|
static int vrf_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
int err;
|
|
|
|
if (!data || !data[IFLA_VRF_TABLE])
|
|
return -EINVAL;
|
|
|
|
vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
|
|
|
|
dev->priv_flags |= IFF_L3MDEV_MASTER;
|
|
|
|
err = register_netdevice(dev);
|
|
if (err < 0)
|
|
goto out_fail;
|
|
|
|
return 0;
|
|
|
|
out_fail:
|
|
free_netdev(dev);
|
|
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 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,
|
|
|
|
.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_master(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,
|
|
};
|
|
|
|
static int __init vrf_init_module(void)
|
|
{
|
|
int rc;
|
|
|
|
vrf_dst_ops.kmem_cachep =
|
|
kmem_cache_create("vrf_ip_dst_cache",
|
|
sizeof(struct rtable), 0,
|
|
SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
|
|
if (!vrf_dst_ops.kmem_cachep)
|
|
return -ENOMEM;
|
|
|
|
register_netdevice_notifier(&vrf_notifier_block);
|
|
|
|
rc = rtnl_link_register(&vrf_link_ops);
|
|
if (rc < 0)
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
unregister_netdevice_notifier(&vrf_notifier_block);
|
|
kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
|
|
return rc;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
module_init(vrf_init_module);
|
|
module_exit(vrf_cleanup_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);
|