--- /dev/null
+/*
+ * GENEVE: Generic Network Virtualization Encapsulation
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/hash.h>
+#include <net/rtnetlink.h>
+#include <net/geneve.h>
+
+#define GENEVE_NETDEV_VER "0.6"
+
+#define GENEVE_UDP_PORT 6081
+
+#define GENEVE_N_VID (1u << 24)
+#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
+
+#define VNI_HASH_BITS 10
+#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
+
+static bool log_ecn_error = true;
+module_param(log_ecn_error, bool, 0644);
+MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+
+/* per-network namespace private data for this module */
+struct geneve_net {
+ struct list_head geneve_list;
+ struct hlist_head vni_list[VNI_HASH_SIZE];
+};
+
+/* Pseudo network device */
+struct geneve_dev {
+ struct hlist_node hlist; /* vni hash table */
+ struct net *net; /* netns for packet i/o */
+ struct net_device *dev; /* netdev for geneve tunnel */
+ struct geneve_sock *sock; /* socket used for geneve tunnel */
+ u8 vni[3]; /* virtual network ID for tunnel */
+ struct sockaddr_in remote; /* IPv4 address for link partner */
+ struct list_head next; /* geneve's per namespace list */
+};
+
+static int geneve_net_id;
+
+static inline __u32 geneve_net_vni_hash(u8 vni[3])
+{
+ __u32 vnid;
+
+ vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
+ return hash_32(vnid, VNI_HASH_BITS);
+}
+
+/* geneve receive/decap routine */
+static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb)
+{
+ struct genevehdr *gnvh = geneve_hdr(skb);
+ struct geneve_dev *dummy, *geneve = NULL;
+ struct geneve_net *gn;
+ struct iphdr *iph = NULL;
+ struct pcpu_sw_netstats *stats;
+ struct hlist_head *vni_list_head;
+ int err = 0;
+ __u32 hash;
+
+ iph = ip_hdr(skb); /* Still outer IP header... */
+
+ gn = gs->rcv_data;
+
+ /* Find the device for this VNI */
+ hash = geneve_net_vni_hash(gnvh->vni);
+ vni_list_head = &gn->vni_list[hash];
+ hlist_for_each_entry_rcu(dummy, vni_list_head, hlist) {
+ if (!memcmp(gnvh->vni, dummy->vni, sizeof(dummy->vni)) &&
+ iph->saddr == dummy->remote.sin_addr.s_addr) {
+ geneve = dummy;
+ break;
+ }
+ }
+ if (!geneve)
+ goto drop;
+
+ /* Drop packets w/ critical options,
+ * since we don't support any...
+ */
+ if (gnvh->critical)
+ goto drop;
+
+ skb_reset_mac_header(skb);
+ skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev)));
+ skb->protocol = eth_type_trans(skb, geneve->dev);
+ skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+
+ /* Ignore packet loops (and multicast echo) */
+ if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
+ goto drop;
+
+ skb_reset_network_header(skb);
+
+ iph = ip_hdr(skb); /* Now inner IP header... */
+ err = IP_ECN_decapsulate(iph, skb);
+
+ if (unlikely(err)) {
+ if (log_ecn_error)
+ net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
+ &iph->saddr, iph->tos);
+ if (err > 1) {
+ ++geneve->dev->stats.rx_frame_errors;
+ ++geneve->dev->stats.rx_errors;
+ goto drop;
+ }
+ }
+
+ stats = this_cpu_ptr(geneve->dev->tstats);
+ u64_stats_update_begin(&stats->syncp);
+ stats->rx_packets++;
+ stats->rx_bytes += skb->len;
+ u64_stats_update_end(&stats->syncp);
+
+ netif_rx(skb);
+
+ return;
+drop:
+ /* Consume bad packet */
+ kfree_skb(skb);
+}
+
+/* Setup stats when device is created */
+static int geneve_init(struct net_device *dev)
+{
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void geneve_uninit(struct net_device *dev)
+{
+ free_percpu(dev->tstats);
+}
+
+static int geneve_open(struct net_device *dev)
+{
+ struct geneve_dev *geneve = netdev_priv(dev);
+ struct net *net = geneve->net;
+ struct geneve_net *gn = net_generic(geneve->net, geneve_net_id);
+ struct geneve_sock *gs;
+
+ gs = geneve_sock_add(net, htons(GENEVE_UDP_PORT), geneve_rx, gn,
+ false, false);
+ if (IS_ERR(gs))
+ return PTR_ERR(gs);
+
+ geneve->sock = gs;
+
+ return 0;
+}
+
+static int geneve_stop(struct net_device *dev)
+{
+ struct geneve_dev *geneve = netdev_priv(dev);
+ struct geneve_sock *gs = geneve->sock;
+
+ geneve_sock_release(gs);
+
+ return 0;
+}
+
+static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct geneve_dev *geneve = netdev_priv(dev);
+ struct geneve_sock *gs = geneve->sock;
+ struct rtable *rt = NULL;
+ const struct iphdr *iip; /* interior IP header */
+ struct flowi4 fl4;
+ int err;
+ __be16 sport;
+ __u8 tos, ttl = 0;
+
+ iip = ip_hdr(skb);
+
+ skb_reset_mac_header(skb);
+
+ /* TODO: port min/max limits should be configurable */
+ sport = udp_flow_src_port(dev_net(dev), skb, 0, 0, true);
+
+ memset(&fl4, 0, sizeof(fl4));
+ fl4.daddr = geneve->remote.sin_addr.s_addr;
+ rt = ip_route_output_key(geneve->net, &fl4);
+ if (IS_ERR(rt)) {
+ netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr);
+ dev->stats.tx_carrier_errors++;
+ goto tx_error;
+ }
+ if (rt->dst.dev == dev) { /* is this necessary? */
+ netdev_dbg(dev, "circular route to %pI4\n", &fl4.daddr);
+ dev->stats.collisions++;
+ goto rt_tx_error;
+ }
+
+ /* TODO: tos and ttl should be configurable */
+
+ tos = ip_tunnel_ecn_encap(0, iip, skb);
+
+ if (IN_MULTICAST(ntohl(fl4.daddr)))
+ ttl = 1;
+
+ ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
+
+ /* no need to handle local destination and encap bypass...yet... */
+
+ err = geneve_xmit_skb(gs, rt, skb, fl4.saddr, fl4.daddr,
+ tos, ttl, 0, sport, htons(GENEVE_UDP_PORT), 0,
+ geneve->vni, 0, NULL, false,
+ !net_eq(geneve->net, dev_net(geneve->dev)));
+ if (err < 0)
+ ip_rt_put(rt);
+
+ iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
+
+ return NETDEV_TX_OK;
+
+rt_tx_error:
+ ip_rt_put(rt);
+tx_error:
+ dev->stats.tx_errors++;
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static const struct net_device_ops geneve_netdev_ops = {
+ .ndo_init = geneve_init,
+ .ndo_uninit = geneve_uninit,
+ .ndo_open = geneve_open,
+ .ndo_stop = geneve_stop,
+ .ndo_start_xmit = geneve_xmit,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
+ .ndo_change_mtu = eth_change_mtu,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_set_mac_address = eth_mac_addr,
+};
+
+static void geneve_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *drvinfo)
+{
+ strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
+ strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
+}
+
+static const struct ethtool_ops geneve_ethtool_ops = {
+ .get_drvinfo = geneve_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+};
+
+/* Info for udev, that this is a virtual tunnel endpoint */
+static struct device_type geneve_type = {
+ .name = "geneve",
+};
+
+/* Initialize the device structure. */
+static void geneve_setup(struct net_device *dev)
+{
+ ether_setup(dev);
+
+ dev->netdev_ops = &geneve_netdev_ops;
+ dev->ethtool_ops = &geneve_ethtool_ops;
+ dev->destructor = free_netdev;
+
+ SET_NETDEV_DEVTYPE(dev, &geneve_type);
+
+ dev->tx_queue_len = 0;
+ dev->features |= NETIF_F_LLTX;
+ dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
+ dev->features |= NETIF_F_RXCSUM;
+ dev->features |= NETIF_F_GSO_SOFTWARE;
+
+ dev->vlan_features = dev->features;
+ dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
+
+ dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
+ dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+ dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
+
+ netif_keep_dst(dev);
+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+}
+
+static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
+ [IFLA_GENEVE_ID] = { .type = NLA_U32 },
+ [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
+};
+
+static int geneve_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;
+ }
+
+ if (!data)
+ return -EINVAL;
+
+ if (data[IFLA_GENEVE_ID]) {
+ __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
+
+ if (vni >= GENEVE_VID_MASK)
+ return -ERANGE;
+ }
+
+ return 0;
+}
+
+static int geneve_newlink(struct net *net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[])
+{
+ struct geneve_net *gn = net_generic(net, geneve_net_id);
+ struct geneve_dev *dummy, *geneve = netdev_priv(dev);
+ struct hlist_head *vni_list_head;
+ struct sockaddr_in remote; /* IPv4 address for link partner */
+ __u32 vni, hash;
+ int err;
+
+ if (!data[IFLA_GENEVE_ID] || !data[IFLA_GENEVE_REMOTE])
+ return -EINVAL;
+
+ geneve->net = net;
+ geneve->dev = dev;
+
+ vni = nla_get_u32(data[IFLA_GENEVE_ID]);
+ geneve->vni[0] = (vni & 0x00ff0000) >> 16;
+ geneve->vni[1] = (vni & 0x0000ff00) >> 8;
+ geneve->vni[2] = vni & 0x000000ff;
+
+ geneve->remote.sin_addr.s_addr =
+ nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
+ if (IN_MULTICAST(ntohl(geneve->remote.sin_addr.s_addr)))
+ return -EINVAL;
+
+ remote = geneve->remote;
+ hash = geneve_net_vni_hash(geneve->vni);
+ vni_list_head = &gn->vni_list[hash];
+ hlist_for_each_entry_rcu(dummy, vni_list_head, hlist) {
+ if (!memcmp(geneve->vni, dummy->vni, sizeof(dummy->vni)) &&
+ !memcmp(&remote, &dummy->remote, sizeof(dummy->remote)))
+ return -EBUSY;
+ }
+
+ if (tb[IFLA_ADDRESS] == NULL)
+ eth_hw_addr_random(dev);
+
+ err = register_netdevice(dev);
+ if (err)
+ return err;
+
+ list_add(&geneve->next, &gn->geneve_list);
+
+ hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]);
+
+ return 0;
+}
+
+static void geneve_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct geneve_dev *geneve = netdev_priv(dev);
+
+ if (!hlist_unhashed(&geneve->hlist))
+ hlist_del_rcu(&geneve->hlist);
+
+ list_del(&geneve->next);
+ unregister_netdevice_queue(dev, head);
+}
+
+static size_t geneve_get_size(const struct net_device *dev)
+{
+ return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
+ nla_total_size(sizeof(struct in_addr)) + /* IFLA_GENEVE_REMOTE */
+ 0;
+}
+
+static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ struct geneve_dev *geneve = netdev_priv(dev);
+ __u32 vni;
+
+ vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
+ if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
+ goto nla_put_failure;
+
+ if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
+ geneve->remote.sin_addr.s_addr))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static struct rtnl_link_ops geneve_link_ops __read_mostly = {
+ .kind = "geneve",
+ .maxtype = IFLA_GENEVE_MAX,
+ .policy = geneve_policy,
+ .priv_size = sizeof(struct geneve_dev),
+ .setup = geneve_setup,
+ .validate = geneve_validate,
+ .newlink = geneve_newlink,
+ .dellink = geneve_dellink,
+ .get_size = geneve_get_size,
+ .fill_info = geneve_fill_info,
+};
+
+static __net_init int geneve_init_net(struct net *net)
+{
+ struct geneve_net *gn = net_generic(net, geneve_net_id);
+ unsigned int h;
+
+ INIT_LIST_HEAD(&gn->geneve_list);
+
+ for (h = 0; h < VNI_HASH_SIZE; ++h)
+ INIT_HLIST_HEAD(&gn->vni_list[h]);
+
+ return 0;
+}
+
+static void __net_exit geneve_exit_net(struct net *net)
+{
+ struct geneve_net *gn = net_generic(net, geneve_net_id);
+ struct geneve_dev *geneve, *next;
+ struct net_device *dev, *aux;
+ LIST_HEAD(list);
+
+ rtnl_lock();
+
+ /* gather any geneve devices that were moved into this ns */
+ for_each_netdev_safe(net, dev, aux)
+ if (dev->rtnl_link_ops == &geneve_link_ops)
+ unregister_netdevice_queue(dev, &list);
+
+ /* now gather any other geneve devices that were created in this ns */
+ list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
+ /* If geneve->dev is in the same netns, it was already added
+ * to the list by the previous loop.
+ */
+ if (!net_eq(dev_net(geneve->dev), net))
+ unregister_netdevice_queue(geneve->dev, &list);
+ }
+
+ /* unregister the devices gathered above */
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+}
+
+static struct pernet_operations geneve_net_ops = {
+ .init = geneve_init_net,
+ .exit = geneve_exit_net,
+ .id = &geneve_net_id,
+ .size = sizeof(struct geneve_net),
+};
+
+static int __init geneve_init_module(void)
+{
+ int rc;
+
+ rc = register_pernet_subsys(&geneve_net_ops);
+ if (rc)
+ goto out1;
+
+ rc = rtnl_link_register(&geneve_link_ops);
+ if (rc)
+ goto out2;
+
+ return 0;
+out2:
+ unregister_pernet_subsys(&geneve_net_ops);
+out1:
+ return rc;
+}
+late_initcall(geneve_init_module);
+
+static void __exit geneve_cleanup_module(void)
+{
+ rtnl_link_unregister(&geneve_link_ops);
+ unregister_pernet_subsys(&geneve_net_ops);
+}
+module_exit(geneve_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(GENEVE_NETDEV_VER);
+MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
+MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
+MODULE_ALIAS_RTNL_LINK("geneve");
projects / cascardo / linux.git / commitdiff