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7bbe33ff18
This is primarily for consistancy with vxlan and other tunnels which use network byte order for similar parameters. Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1059 lines
25 KiB
C
1059 lines
25 KiB
C
/*
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* GENEVE: Generic Network Virtualization Encapsulation
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*
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* Copyright (c) 2015 Red Hat, Inc.
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/hash.h>
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#include <net/dst_metadata.h>
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#include <net/gro_cells.h>
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#include <net/rtnetlink.h>
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#include <net/geneve.h>
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#include <net/protocol.h>
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#define GENEVE_NETDEV_VER "0.6"
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#define GENEVE_UDP_PORT 6081
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#define GENEVE_N_VID (1u << 24)
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#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
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#define VNI_HASH_BITS 10
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#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
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static bool log_ecn_error = true;
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module_param(log_ecn_error, bool, 0644);
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MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
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#define GENEVE_VER 0
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#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
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/* per-network namespace private data for this module */
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struct geneve_net {
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struct list_head geneve_list;
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struct list_head sock_list;
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};
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static int geneve_net_id;
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/* Pseudo network device */
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struct geneve_dev {
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struct hlist_node hlist; /* vni hash table */
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struct net *net; /* netns for packet i/o */
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struct net_device *dev; /* netdev for geneve tunnel */
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struct geneve_sock *sock; /* socket used for geneve tunnel */
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u8 vni[3]; /* virtual network ID for tunnel */
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u8 ttl; /* TTL override */
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u8 tos; /* TOS override */
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struct sockaddr_in remote; /* IPv4 address for link partner */
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struct list_head next; /* geneve's per namespace list */
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__be16 dst_port;
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bool collect_md;
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struct gro_cells gro_cells;
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};
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struct geneve_sock {
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bool collect_md;
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struct list_head list;
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struct socket *sock;
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struct rcu_head rcu;
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int refcnt;
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struct udp_offload udp_offloads;
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struct hlist_head vni_list[VNI_HASH_SIZE];
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};
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static inline __u32 geneve_net_vni_hash(u8 vni[3])
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{
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__u32 vnid;
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vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
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return hash_32(vnid, VNI_HASH_BITS);
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}
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static __be64 vni_to_tunnel_id(const __u8 *vni)
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{
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#ifdef __BIG_ENDIAN
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return (vni[0] << 16) | (vni[1] << 8) | vni[2];
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#else
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return (__force __be64)(((__force u64)vni[0] << 40) |
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((__force u64)vni[1] << 48) |
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((__force u64)vni[2] << 56));
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#endif
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}
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static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
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__be32 addr, u8 vni[])
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{
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struct hlist_head *vni_list_head;
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struct geneve_dev *geneve;
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__u32 hash;
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/* Find the device for this VNI */
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hash = geneve_net_vni_hash(vni);
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vni_list_head = &gs->vni_list[hash];
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hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
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if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
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addr == geneve->remote.sin_addr.s_addr)
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return geneve;
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}
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return NULL;
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}
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static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
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{
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return (struct genevehdr *)(udp_hdr(skb) + 1);
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}
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/* geneve receive/decap routine */
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static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb)
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{
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struct genevehdr *gnvh = geneve_hdr(skb);
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struct metadata_dst *tun_dst = NULL;
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struct geneve_dev *geneve = NULL;
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struct pcpu_sw_netstats *stats;
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struct iphdr *iph;
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u8 *vni;
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__be32 addr;
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int err;
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iph = ip_hdr(skb); /* outer IP header... */
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if (gs->collect_md) {
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static u8 zero_vni[3];
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vni = zero_vni;
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addr = 0;
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} else {
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vni = gnvh->vni;
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addr = iph->saddr;
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}
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geneve = geneve_lookup(gs, addr, vni);
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if (!geneve)
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goto drop;
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if (ip_tunnel_collect_metadata() || gs->collect_md) {
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__be16 flags;
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flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
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(gnvh->oam ? TUNNEL_OAM : 0) |
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(gnvh->critical ? TUNNEL_CRIT_OPT : 0);
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tun_dst = udp_tun_rx_dst(skb, AF_INET, flags,
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vni_to_tunnel_id(gnvh->vni),
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gnvh->opt_len * 4);
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if (!tun_dst)
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goto drop;
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/* Update tunnel dst according to Geneve options. */
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ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
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gnvh->options, gnvh->opt_len * 4);
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} else {
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/* Drop packets w/ critical options,
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* since we don't support any...
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*/
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if (gnvh->critical)
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goto drop;
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}
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skb_reset_mac_header(skb);
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skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev)));
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skb->protocol = eth_type_trans(skb, geneve->dev);
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skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
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if (tun_dst)
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skb_dst_set(skb, &tun_dst->dst);
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/* Ignore packet loops (and multicast echo) */
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if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
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goto drop;
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skb_reset_network_header(skb);
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err = IP_ECN_decapsulate(iph, skb);
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if (unlikely(err)) {
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if (log_ecn_error)
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net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
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&iph->saddr, iph->tos);
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if (err > 1) {
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++geneve->dev->stats.rx_frame_errors;
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++geneve->dev->stats.rx_errors;
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goto drop;
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}
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}
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stats = this_cpu_ptr(geneve->dev->tstats);
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u64_stats_update_begin(&stats->syncp);
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stats->rx_packets++;
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stats->rx_bytes += skb->len;
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u64_stats_update_end(&stats->syncp);
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gro_cells_receive(&geneve->gro_cells, skb);
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return;
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drop:
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/* Consume bad packet */
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kfree_skb(skb);
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}
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/* Setup stats when device is created */
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static int geneve_init(struct net_device *dev)
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{
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struct geneve_dev *geneve = netdev_priv(dev);
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int err;
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dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
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if (!dev->tstats)
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return -ENOMEM;
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err = gro_cells_init(&geneve->gro_cells, dev);
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if (err) {
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free_percpu(dev->tstats);
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return err;
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}
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return 0;
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}
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static void geneve_uninit(struct net_device *dev)
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{
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struct geneve_dev *geneve = netdev_priv(dev);
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gro_cells_destroy(&geneve->gro_cells);
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free_percpu(dev->tstats);
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}
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/* Callback from net/ipv4/udp.c to receive packets */
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static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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{
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struct genevehdr *geneveh;
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struct geneve_sock *gs;
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int opts_len;
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/* Need Geneve and inner Ethernet header to be present */
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if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
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goto error;
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/* Return packets with reserved bits set */
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geneveh = geneve_hdr(skb);
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if (unlikely(geneveh->ver != GENEVE_VER))
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goto error;
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if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
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goto error;
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opts_len = geneveh->opt_len * 4;
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if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
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htons(ETH_P_TEB)))
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goto drop;
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gs = rcu_dereference_sk_user_data(sk);
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if (!gs)
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goto drop;
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geneve_rx(gs, skb);
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return 0;
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drop:
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/* Consume bad packet */
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kfree_skb(skb);
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return 0;
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error:
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/* Let the UDP layer deal with the skb */
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return 1;
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}
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static struct socket *geneve_create_sock(struct net *net, bool ipv6,
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__be16 port)
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{
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struct socket *sock;
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struct udp_port_cfg udp_conf;
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int err;
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memset(&udp_conf, 0, sizeof(udp_conf));
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if (ipv6) {
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udp_conf.family = AF_INET6;
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} else {
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udp_conf.family = AF_INET;
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udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
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}
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udp_conf.local_udp_port = port;
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/* Open UDP socket */
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err = udp_sock_create(net, &udp_conf, &sock);
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if (err < 0)
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return ERR_PTR(err);
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return sock;
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}
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static void geneve_notify_add_rx_port(struct geneve_sock *gs)
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{
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struct sock *sk = gs->sock->sk;
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sa_family_t sa_family = sk->sk_family;
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int err;
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if (sa_family == AF_INET) {
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err = udp_add_offload(&gs->udp_offloads);
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if (err)
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pr_warn("geneve: udp_add_offload failed with status %d\n",
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err);
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}
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}
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static int geneve_hlen(struct genevehdr *gh)
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{
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return sizeof(*gh) + gh->opt_len * 4;
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}
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static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
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struct sk_buff *skb,
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struct udp_offload *uoff)
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{
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struct sk_buff *p, **pp = NULL;
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struct genevehdr *gh, *gh2;
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unsigned int hlen, gh_len, off_gnv;
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const struct packet_offload *ptype;
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__be16 type;
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int flush = 1;
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off_gnv = skb_gro_offset(skb);
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hlen = off_gnv + sizeof(*gh);
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gh = skb_gro_header_fast(skb, off_gnv);
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if (skb_gro_header_hard(skb, hlen)) {
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gh = skb_gro_header_slow(skb, hlen, off_gnv);
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if (unlikely(!gh))
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goto out;
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}
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if (gh->ver != GENEVE_VER || gh->oam)
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goto out;
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gh_len = geneve_hlen(gh);
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hlen = off_gnv + gh_len;
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if (skb_gro_header_hard(skb, hlen)) {
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gh = skb_gro_header_slow(skb, hlen, off_gnv);
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if (unlikely(!gh))
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goto out;
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}
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flush = 0;
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for (p = *head; p; p = p->next) {
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if (!NAPI_GRO_CB(p)->same_flow)
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continue;
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gh2 = (struct genevehdr *)(p->data + off_gnv);
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if (gh->opt_len != gh2->opt_len ||
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memcmp(gh, gh2, gh_len)) {
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NAPI_GRO_CB(p)->same_flow = 0;
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continue;
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}
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}
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type = gh->proto_type;
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rcu_read_lock();
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ptype = gro_find_receive_by_type(type);
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if (!ptype) {
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flush = 1;
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goto out_unlock;
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}
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skb_gro_pull(skb, gh_len);
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skb_gro_postpull_rcsum(skb, gh, gh_len);
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pp = ptype->callbacks.gro_receive(head, skb);
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out_unlock:
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rcu_read_unlock();
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out:
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NAPI_GRO_CB(skb)->flush |= flush;
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return pp;
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}
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static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
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struct udp_offload *uoff)
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{
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struct genevehdr *gh;
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struct packet_offload *ptype;
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__be16 type;
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int gh_len;
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int err = -ENOSYS;
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udp_tunnel_gro_complete(skb, nhoff);
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gh = (struct genevehdr *)(skb->data + nhoff);
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gh_len = geneve_hlen(gh);
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type = gh->proto_type;
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rcu_read_lock();
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ptype = gro_find_complete_by_type(type);
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if (ptype)
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err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
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rcu_read_unlock();
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return err;
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}
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/* Create new listen socket if needed */
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static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
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bool ipv6)
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{
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struct geneve_net *gn = net_generic(net, geneve_net_id);
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struct geneve_sock *gs;
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struct socket *sock;
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struct udp_tunnel_sock_cfg tunnel_cfg;
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int h;
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gs = kzalloc(sizeof(*gs), GFP_KERNEL);
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if (!gs)
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return ERR_PTR(-ENOMEM);
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sock = geneve_create_sock(net, ipv6, port);
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if (IS_ERR(sock)) {
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kfree(gs);
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return ERR_CAST(sock);
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}
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gs->sock = sock;
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gs->refcnt = 1;
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for (h = 0; h < VNI_HASH_SIZE; ++h)
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INIT_HLIST_HEAD(&gs->vni_list[h]);
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/* Initialize the geneve udp offloads structure */
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gs->udp_offloads.port = port;
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gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive;
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gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
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geneve_notify_add_rx_port(gs);
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/* Mark socket as an encapsulation socket */
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tunnel_cfg.sk_user_data = gs;
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tunnel_cfg.encap_type = 1;
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tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
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tunnel_cfg.encap_destroy = NULL;
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setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
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list_add(&gs->list, &gn->sock_list);
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return gs;
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}
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static void geneve_notify_del_rx_port(struct geneve_sock *gs)
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{
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struct sock *sk = gs->sock->sk;
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sa_family_t sa_family = sk->sk_family;
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if (sa_family == AF_INET)
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udp_del_offload(&gs->udp_offloads);
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}
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static void geneve_sock_release(struct geneve_sock *gs)
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{
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if (--gs->refcnt)
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return;
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list_del(&gs->list);
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geneve_notify_del_rx_port(gs);
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udp_tunnel_sock_release(gs->sock);
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kfree_rcu(gs, rcu);
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}
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|
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static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
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__be16 dst_port)
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{
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struct geneve_sock *gs;
|
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list_for_each_entry(gs, &gn->sock_list, list) {
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if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
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inet_sk(gs->sock->sk)->sk.sk_family == AF_INET) {
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return gs;
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}
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}
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return NULL;
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}
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static int geneve_open(struct net_device *dev)
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{
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struct geneve_dev *geneve = netdev_priv(dev);
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struct net *net = geneve->net;
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struct geneve_net *gn = net_generic(net, geneve_net_id);
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struct geneve_sock *gs;
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__u32 hash;
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gs = geneve_find_sock(gn, geneve->dst_port);
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if (gs) {
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gs->refcnt++;
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goto out;
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}
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gs = geneve_socket_create(net, geneve->dst_port, false);
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if (IS_ERR(gs))
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return PTR_ERR(gs);
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|
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out:
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gs->collect_md = geneve->collect_md;
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geneve->sock = gs;
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hash = geneve_net_vni_hash(geneve->vni);
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hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
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return 0;
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}
|
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|
|
static int geneve_stop(struct net_device *dev)
|
|
{
|
|
struct geneve_dev *geneve = netdev_priv(dev);
|
|
struct geneve_sock *gs = geneve->sock;
|
|
|
|
if (!hlist_unhashed(&geneve->hlist))
|
|
hlist_del_rcu(&geneve->hlist);
|
|
geneve_sock_release(gs);
|
|
return 0;
|
|
}
|
|
|
|
static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
|
|
__be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
|
|
bool csum)
|
|
{
|
|
struct genevehdr *gnvh;
|
|
int min_headroom;
|
|
int err;
|
|
|
|
min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
|
|
+ GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
|
|
err = skb_cow_head(skb, min_headroom);
|
|
if (unlikely(err)) {
|
|
kfree_skb(skb);
|
|
goto free_rt;
|
|
}
|
|
|
|
skb = udp_tunnel_handle_offloads(skb, csum);
|
|
if (IS_ERR(skb)) {
|
|
err = PTR_ERR(skb);
|
|
goto free_rt;
|
|
}
|
|
|
|
gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
|
|
gnvh->ver = GENEVE_VER;
|
|
gnvh->opt_len = opt_len / 4;
|
|
gnvh->oam = !!(tun_flags & TUNNEL_OAM);
|
|
gnvh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
|
|
gnvh->rsvd1 = 0;
|
|
memcpy(gnvh->vni, vni, 3);
|
|
gnvh->proto_type = htons(ETH_P_TEB);
|
|
gnvh->rsvd2 = 0;
|
|
memcpy(gnvh->options, opt, opt_len);
|
|
|
|
skb_set_inner_protocol(skb, htons(ETH_P_TEB));
|
|
return 0;
|
|
|
|
free_rt:
|
|
ip_rt_put(rt);
|
|
return err;
|
|
}
|
|
|
|
static struct rtable *geneve_get_rt(struct sk_buff *skb,
|
|
struct net_device *dev,
|
|
struct flowi4 *fl4,
|
|
struct ip_tunnel_info *info)
|
|
{
|
|
struct geneve_dev *geneve = netdev_priv(dev);
|
|
struct rtable *rt = NULL;
|
|
__u8 tos;
|
|
|
|
memset(fl4, 0, sizeof(*fl4));
|
|
fl4->flowi4_mark = skb->mark;
|
|
fl4->flowi4_proto = IPPROTO_UDP;
|
|
|
|
if (info) {
|
|
fl4->daddr = info->key.u.ipv4.dst;
|
|
fl4->saddr = info->key.u.ipv4.src;
|
|
fl4->flowi4_tos = RT_TOS(info->key.tos);
|
|
} else {
|
|
tos = geneve->tos;
|
|
if (tos == 1) {
|
|
const struct iphdr *iip = ip_hdr(skb);
|
|
|
|
tos = ip_tunnel_get_dsfield(iip, skb);
|
|
}
|
|
|
|
fl4->flowi4_tos = RT_TOS(tos);
|
|
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++;
|
|
return rt;
|
|
}
|
|
if (rt->dst.dev == dev) { /* is this necessary? */
|
|
netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
|
|
dev->stats.collisions++;
|
|
ip_rt_put(rt);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
return rt;
|
|
}
|
|
|
|
/* Convert 64 bit tunnel ID to 24 bit VNI. */
|
|
static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
|
|
{
|
|
#ifdef __BIG_ENDIAN
|
|
vni[0] = (__force __u8)(tun_id >> 16);
|
|
vni[1] = (__force __u8)(tun_id >> 8);
|
|
vni[2] = (__force __u8)tun_id;
|
|
#else
|
|
vni[0] = (__force __u8)((__force u64)tun_id >> 40);
|
|
vni[1] = (__force __u8)((__force u64)tun_id >> 48);
|
|
vni[2] = (__force __u8)((__force u64)tun_id >> 56);
|
|
#endif
|
|
}
|
|
|
|
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 ip_tunnel_info *info = NULL;
|
|
struct rtable *rt = NULL;
|
|
const struct iphdr *iip; /* interior IP header */
|
|
struct flowi4 fl4;
|
|
__u8 tos, ttl;
|
|
__be16 sport;
|
|
bool udp_csum;
|
|
__be16 df;
|
|
int err;
|
|
|
|
if (geneve->collect_md) {
|
|
info = skb_tunnel_info(skb);
|
|
if (unlikely(info && !(info->mode & IP_TUNNEL_INFO_TX))) {
|
|
netdev_dbg(dev, "no tunnel metadata\n");
|
|
goto tx_error;
|
|
}
|
|
if (info && ip_tunnel_info_af(info) != AF_INET)
|
|
goto tx_error;
|
|
}
|
|
|
|
rt = geneve_get_rt(skb, dev, &fl4, info);
|
|
if (IS_ERR(rt)) {
|
|
netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr);
|
|
dev->stats.tx_carrier_errors++;
|
|
goto tx_error;
|
|
}
|
|
|
|
sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
|
|
skb_reset_mac_header(skb);
|
|
|
|
iip = ip_hdr(skb);
|
|
|
|
if (info) {
|
|
const struct ip_tunnel_key *key = &info->key;
|
|
u8 *opts = NULL;
|
|
u8 vni[3];
|
|
|
|
tunnel_id_to_vni(key->tun_id, vni);
|
|
if (key->tun_flags & TUNNEL_GENEVE_OPT)
|
|
opts = ip_tunnel_info_opts(info);
|
|
|
|
udp_csum = !!(key->tun_flags & TUNNEL_CSUM);
|
|
err = geneve_build_skb(rt, skb, key->tun_flags, vni,
|
|
info->options_len, opts, udp_csum);
|
|
if (unlikely(err))
|
|
goto err;
|
|
|
|
tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
|
|
ttl = key->ttl;
|
|
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
|
|
} else {
|
|
udp_csum = false;
|
|
err = geneve_build_skb(rt, skb, 0, geneve->vni,
|
|
0, NULL, udp_csum);
|
|
if (unlikely(err))
|
|
goto err;
|
|
|
|
tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
|
|
ttl = geneve->ttl;
|
|
if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
|
|
ttl = 1;
|
|
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
|
|
df = 0;
|
|
}
|
|
err = udp_tunnel_xmit_skb(rt, gs->sock->sk, skb, fl4.saddr, fl4.daddr,
|
|
tos, ttl, df, sport, geneve->dst_port,
|
|
!net_eq(geneve->net, dev_net(geneve->dev)),
|
|
!udp_csum);
|
|
|
|
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
|
|
return NETDEV_TX_OK;
|
|
|
|
tx_error:
|
|
dev_kfree_skb(skb);
|
|
err:
|
|
dev->stats.tx_errors++;
|
|
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->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->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
|
|
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
|
|
|
|
netif_keep_dst(dev);
|
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
|
|
eth_hw_addr_random(dev);
|
|
}
|
|
|
|
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) },
|
|
[IFLA_GENEVE_TTL] = { .type = NLA_U8 },
|
|
[IFLA_GENEVE_TOS] = { .type = NLA_U8 },
|
|
[IFLA_GENEVE_PORT] = { .type = NLA_U16 },
|
|
[IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
|
|
};
|
|
|
|
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 struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
|
|
__be16 dst_port,
|
|
__be32 rem_addr,
|
|
u8 vni[],
|
|
bool *tun_on_same_port,
|
|
bool *tun_collect_md)
|
|
{
|
|
struct geneve_dev *geneve, *t;
|
|
|
|
*tun_on_same_port = false;
|
|
*tun_collect_md = false;
|
|
t = NULL;
|
|
list_for_each_entry(geneve, &gn->geneve_list, next) {
|
|
if (geneve->dst_port == dst_port) {
|
|
*tun_collect_md = geneve->collect_md;
|
|
*tun_on_same_port = true;
|
|
}
|
|
if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
|
|
rem_addr == geneve->remote.sin_addr.s_addr &&
|
|
dst_port == geneve->dst_port)
|
|
t = geneve;
|
|
}
|
|
return t;
|
|
}
|
|
|
|
static int geneve_configure(struct net *net, struct net_device *dev,
|
|
__be32 rem_addr, __u32 vni, __u8 ttl, __u8 tos,
|
|
__be16 dst_port, bool metadata)
|
|
{
|
|
struct geneve_net *gn = net_generic(net, geneve_net_id);
|
|
struct geneve_dev *t, *geneve = netdev_priv(dev);
|
|
bool tun_collect_md, tun_on_same_port;
|
|
int err;
|
|
|
|
if (metadata) {
|
|
if (rem_addr || vni || tos || ttl)
|
|
return -EINVAL;
|
|
}
|
|
|
|
geneve->net = net;
|
|
geneve->dev = dev;
|
|
|
|
geneve->vni[0] = (vni & 0x00ff0000) >> 16;
|
|
geneve->vni[1] = (vni & 0x0000ff00) >> 8;
|
|
geneve->vni[2] = vni & 0x000000ff;
|
|
|
|
geneve->remote.sin_addr.s_addr = rem_addr;
|
|
if (IN_MULTICAST(ntohl(geneve->remote.sin_addr.s_addr)))
|
|
return -EINVAL;
|
|
|
|
geneve->ttl = ttl;
|
|
geneve->tos = tos;
|
|
geneve->dst_port = dst_port;
|
|
geneve->collect_md = metadata;
|
|
|
|
t = geneve_find_dev(gn, dst_port, rem_addr, geneve->vni,
|
|
&tun_on_same_port, &tun_collect_md);
|
|
if (t)
|
|
return -EBUSY;
|
|
|
|
if (metadata) {
|
|
if (tun_on_same_port)
|
|
return -EPERM;
|
|
} else {
|
|
if (tun_collect_md)
|
|
return -EPERM;
|
|
}
|
|
|
|
err = register_netdevice(dev);
|
|
if (err)
|
|
return err;
|
|
|
|
list_add(&geneve->next, &gn->geneve_list);
|
|
return 0;
|
|
}
|
|
|
|
static int geneve_newlink(struct net *net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
__be16 dst_port = htons(GENEVE_UDP_PORT);
|
|
__u8 ttl = 0, tos = 0;
|
|
bool metadata = false;
|
|
__be32 rem_addr;
|
|
__u32 vni;
|
|
|
|
if (!data[IFLA_GENEVE_ID] || !data[IFLA_GENEVE_REMOTE])
|
|
return -EINVAL;
|
|
|
|
vni = nla_get_u32(data[IFLA_GENEVE_ID]);
|
|
rem_addr = nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
|
|
|
|
if (data[IFLA_GENEVE_TTL])
|
|
ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
|
|
|
|
if (data[IFLA_GENEVE_TOS])
|
|
tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
|
|
|
|
if (data[IFLA_GENEVE_PORT])
|
|
dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
|
|
|
|
if (data[IFLA_GENEVE_COLLECT_METADATA])
|
|
metadata = true;
|
|
|
|
return geneve_configure(net, dev, rem_addr, vni,
|
|
ttl, tos, dst_port, metadata);
|
|
}
|
|
|
|
static void geneve_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
struct geneve_dev *geneve = netdev_priv(dev);
|
|
|
|
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 */
|
|
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
|
|
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
|
|
nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
|
|
nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
|
|
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;
|
|
|
|
if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
|
|
nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
|
|
goto nla_put_failure;
|
|
|
|
if (geneve->collect_md) {
|
|
if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
|
|
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,
|
|
};
|
|
|
|
struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
|
|
u8 name_assign_type, u16 dst_port)
|
|
{
|
|
struct nlattr *tb[IFLA_MAX + 1];
|
|
struct net_device *dev;
|
|
int err;
|
|
|
|
memset(tb, 0, sizeof(tb));
|
|
dev = rtnl_create_link(net, name, name_assign_type,
|
|
&geneve_link_ops, tb);
|
|
if (IS_ERR(dev))
|
|
return dev;
|
|
|
|
err = geneve_configure(net, dev, 0, 0, 0, 0, htons(dst_port), true);
|
|
if (err) {
|
|
free_netdev(dev);
|
|
return ERR_PTR(err);
|
|
}
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
|
|
|
|
static __net_init int geneve_init_net(struct net *net)
|
|
{
|
|
struct geneve_net *gn = net_generic(net, geneve_net_id);
|
|
|
|
INIT_LIST_HEAD(&gn->geneve_list);
|
|
INIT_LIST_HEAD(&gn->sock_list);
|
|
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");
|