/*
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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/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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#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
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#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
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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 unsigned int geneve_net_id;
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struct geneve_dev_node {
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struct hlist_node hlist;
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struct geneve_dev *geneve;
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};
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/* Pseudo network device */
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struct geneve_dev {
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struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
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#if IS_ENABLED(CONFIG_IPV6)
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struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
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#endif
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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 ip_tunnel_info info;
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struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
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#if IS_ENABLED(CONFIG_IPV6)
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struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
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#endif
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struct list_head next; /* geneve's per namespace list */
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struct gro_cells gro_cells;
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bool collect_md;
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bool use_udp6_rx_checksums;
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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 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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/* Convert 64 bit tunnel ID to 24 bit VNI. */
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static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
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{
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#ifdef __BIG_ENDIAN
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vni[0] = (__force __u8)(tun_id >> 16);
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vni[1] = (__force __u8)(tun_id >> 8);
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vni[2] = (__force __u8)tun_id;
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#else
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vni[0] = (__force __u8)((__force u64)tun_id >> 40);
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vni[1] = (__force __u8)((__force u64)tun_id >> 48);
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vni[2] = (__force __u8)((__force u64)tun_id >> 56);
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#endif
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}
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static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
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{
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return !memcmp(vni, &tun_id[5], 3);
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}
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static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
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{
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return gs->sock->sk->sk_family;
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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_node *node;
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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(node, vni_list_head, hlist) {
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if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
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addr == node->geneve->info.key.u.ipv4.dst)
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return node->geneve;
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}
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return NULL;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
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struct in6_addr addr6, u8 vni[])
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{
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struct hlist_head *vni_list_head;
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struct geneve_dev_node *node;
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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(node, vni_list_head, hlist) {
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if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
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ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
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return node->geneve;
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}
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return NULL;
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}
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#endif
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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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static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
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struct sk_buff *skb)
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{
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static u8 zero_vni[3];
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u8 *vni;
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if (geneve_get_sk_family(gs) == AF_INET) {
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struct iphdr *iph;
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__be32 addr;
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iph = ip_hdr(skb); /* outer IP header... */
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if (gs->collect_md) {
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vni = zero_vni;
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addr = 0;
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} else {
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vni = geneve_hdr(skb)->vni;
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addr = iph->saddr;
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}
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return geneve_lookup(gs, addr, vni);
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#if IS_ENABLED(CONFIG_IPV6)
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} else if (geneve_get_sk_family(gs) == AF_INET6) {
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static struct in6_addr zero_addr6;
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struct ipv6hdr *ip6h;
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struct in6_addr addr6;
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ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
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if (gs->collect_md) {
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vni = zero_vni;
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addr6 = zero_addr6;
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} else {
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vni = geneve_hdr(skb)->vni;
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addr6 = ip6h->saddr;
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}
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return geneve6_lookup(gs, addr6, vni);
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#endif
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}
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return NULL;
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}
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/* geneve receive/decap routine */
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static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
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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 pcpu_sw_netstats *stats;
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unsigned int len;
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int err = 0;
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void *oiph;
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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 | (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, geneve_get_sk_family(gs), 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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geneve->dev->stats.rx_dropped++;
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goto drop;
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}
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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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TUNNEL_GENEVE_OPT);
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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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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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skb_reset_mac_header(skb);
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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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geneve->dev->stats.rx_errors++;
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goto drop;
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}
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oiph = skb_network_header(skb);
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skb_reset_network_header(skb);
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if (geneve_get_sk_family(gs) == AF_INET)
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err = IP_ECN_decapsulate(oiph, skb);
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#if IS_ENABLED(CONFIG_IPV6)
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else
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err = IP6_ECN_decapsulate(oiph, skb);
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#endif
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if (unlikely(err)) {
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if (log_ecn_error) {
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if (geneve_get_sk_family(gs) == AF_INET)
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net_info_ratelimited("non-ECT from %pI4 "
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"with TOS=%#x\n",
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&((struct iphdr *)oiph)->saddr,
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((struct iphdr *)oiph)->tos);
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#if IS_ENABLED(CONFIG_IPV6)
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else
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net_info_ratelimited("non-ECT from %pI6\n",
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&((struct ipv6hdr *)oiph)->saddr);
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#endif
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}
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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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len = skb->len;
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err = gro_cells_receive(&geneve->gro_cells, skb);
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if (likely(err == NET_RX_SUCCESS)) {
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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 += len;
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u64_stats_update_end(&stats->syncp);
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}
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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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err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
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if (err) {
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free_percpu(dev->tstats);
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gro_cells_destroy(&geneve->gro_cells);
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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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dst_cache_destroy(&geneve->info.dst_cache);
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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_dev *geneve;
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struct geneve_sock *gs;
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int opts_len;
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/* Need UDP and Geneve header to be present */
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if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
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goto drop;
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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 drop;
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if (unlikely(geneveh->proto_type != 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 = geneve_lookup_skb(gs, skb);
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if (!geneve)
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goto drop;
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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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!net_eq(geneve->net, dev_net(geneve->dev)))) {
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geneve->dev->stats.rx_dropped++;
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goto drop;
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}
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geneve_rx(geneve, 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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}
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static struct socket *geneve_create_sock(struct net *net, bool ipv6,
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__be16 port, bool ipv6_rx_csum)
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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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udp_conf.ipv6_v6only = 1;
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udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
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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 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 sock *sk,
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struct list_head *head,
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struct sk_buff *skb)
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{
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struct sk_buff *pp = NULL;
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struct sk_buff *p;
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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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list_for_each_entry(p, head, list) {
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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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goto out_unlock;
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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 = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
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flush = 0;
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|
out_unlock:
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rcu_read_unlock();
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out:
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skb_gro_flush_final(skb, pp, flush);
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return pp;
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}
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static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
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int nhoff)
|
{
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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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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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skb_set_inner_mac_header(skb, nhoff + gh_len);
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return err;
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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, bool ipv6_rx_csum)
|
{
|
struct geneve_net *gn = net_generic(net, geneve_net_id);
|
struct geneve_sock *gs;
|
struct socket *sock;
|
struct udp_tunnel_sock_cfg tunnel_cfg;
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int h;
|
|
gs = kzalloc(sizeof(*gs), GFP_KERNEL);
|
if (!gs)
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return ERR_PTR(-ENOMEM);
|
|
sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
|
if (IS_ERR(sock)) {
|
kfree(gs);
|
return ERR_CAST(sock);
|
}
|
|
gs->sock = sock;
|
gs->refcnt = 1;
|
for (h = 0; h < VNI_HASH_SIZE; ++h)
|
INIT_HLIST_HEAD(&gs->vni_list[h]);
|
|
/* Initialize the geneve udp offloads structure */
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udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
|
|
/* Mark socket as an encapsulation socket */
|
memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
|
tunnel_cfg.sk_user_data = gs;
|
tunnel_cfg.encap_type = 1;
|
tunnel_cfg.gro_receive = geneve_gro_receive;
|
tunnel_cfg.gro_complete = geneve_gro_complete;
|
tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
|
tunnel_cfg.encap_destroy = NULL;
|
setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
|
list_add(&gs->list, &gn->sock_list);
|
return gs;
|
}
|
|
static void __geneve_sock_release(struct geneve_sock *gs)
|
{
|
if (!gs || --gs->refcnt)
|
return;
|
|
list_del(&gs->list);
|
udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
|
udp_tunnel_sock_release(gs->sock);
|
kfree_rcu(gs, rcu);
|
}
|
|
static void geneve_sock_release(struct geneve_dev *geneve)
|
{
|
struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
|
#if IS_ENABLED(CONFIG_IPV6)
|
struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
|
|
rcu_assign_pointer(geneve->sock6, NULL);
|
#endif
|
|
rcu_assign_pointer(geneve->sock4, NULL);
|
synchronize_net();
|
|
__geneve_sock_release(gs4);
|
#if IS_ENABLED(CONFIG_IPV6)
|
__geneve_sock_release(gs6);
|
#endif
|
}
|
|
static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
|
sa_family_t family,
|
__be16 dst_port)
|
{
|
struct geneve_sock *gs;
|
|
list_for_each_entry(gs, &gn->sock_list, list) {
|
if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
|
geneve_get_sk_family(gs) == family) {
|
return gs;
|
}
|
}
|
return NULL;
|
}
|
|
static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
|
{
|
struct net *net = geneve->net;
|
struct geneve_net *gn = net_generic(net, geneve_net_id);
|
struct geneve_dev_node *node;
|
struct geneve_sock *gs;
|
__u8 vni[3];
|
__u32 hash;
|
|
gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
|
if (gs) {
|
gs->refcnt++;
|
goto out;
|
}
|
|
gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
|
geneve->use_udp6_rx_checksums);
|
if (IS_ERR(gs))
|
return PTR_ERR(gs);
|
|
out:
|
gs->collect_md = geneve->collect_md;
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (ipv6) {
|
rcu_assign_pointer(geneve->sock6, gs);
|
node = &geneve->hlist6;
|
} else
|
#endif
|
{
|
rcu_assign_pointer(geneve->sock4, gs);
|
node = &geneve->hlist4;
|
}
|
node->geneve = geneve;
|
|
tunnel_id_to_vni(geneve->info.key.tun_id, vni);
|
hash = geneve_net_vni_hash(vni);
|
hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
|
return 0;
|
}
|
|
static int geneve_open(struct net_device *dev)
|
{
|
struct geneve_dev *geneve = netdev_priv(dev);
|
bool metadata = geneve->collect_md;
|
bool ipv4, ipv6;
|
int ret = 0;
|
|
ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
|
ipv4 = !ipv6 || metadata;
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (ipv6) {
|
ret = geneve_sock_add(geneve, true);
|
if (ret < 0 && ret != -EAFNOSUPPORT)
|
ipv4 = false;
|
}
|
#endif
|
if (ipv4)
|
ret = geneve_sock_add(geneve, false);
|
if (ret < 0)
|
geneve_sock_release(geneve);
|
|
return ret;
|
}
|
|
static int geneve_stop(struct net_device *dev)
|
{
|
struct geneve_dev *geneve = netdev_priv(dev);
|
|
hlist_del_init_rcu(&geneve->hlist4.hlist);
|
#if IS_ENABLED(CONFIG_IPV6)
|
hlist_del_init_rcu(&geneve->hlist6.hlist);
|
#endif
|
geneve_sock_release(geneve);
|
return 0;
|
}
|
|
static void geneve_build_header(struct genevehdr *geneveh,
|
const struct ip_tunnel_info *info)
|
{
|
geneveh->ver = GENEVE_VER;
|
geneveh->opt_len = info->options_len / 4;
|
geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
|
geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
|
geneveh->rsvd1 = 0;
|
tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
|
geneveh->proto_type = htons(ETH_P_TEB);
|
geneveh->rsvd2 = 0;
|
|
if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
|
ip_tunnel_info_opts_get(geneveh->options, info);
|
}
|
|
static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
|
const struct ip_tunnel_info *info,
|
bool xnet, int ip_hdr_len)
|
{
|
bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
|
struct genevehdr *gnvh;
|
int min_headroom;
|
int err;
|
|
skb_reset_mac_header(skb);
|
skb_scrub_packet(skb, xnet);
|
|
min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
|
GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
|
err = skb_cow_head(skb, min_headroom);
|
if (unlikely(err))
|
goto free_dst;
|
|
err = udp_tunnel_handle_offloads(skb, udp_sum);
|
if (err)
|
goto free_dst;
|
|
gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
|
geneve_build_header(gnvh, info);
|
skb_set_inner_protocol(skb, htons(ETH_P_TEB));
|
return 0;
|
|
free_dst:
|
dst_release(dst);
|
return err;
|
}
|
|
static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
|
struct net_device *dev,
|
struct geneve_sock *gs4,
|
struct flowi4 *fl4,
|
const struct ip_tunnel_info *info,
|
__be16 dport, __be16 sport)
|
{
|
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
|
struct geneve_dev *geneve = netdev_priv(dev);
|
struct dst_cache *dst_cache;
|
struct rtable *rt = NULL;
|
__u8 tos;
|
|
if (!gs4)
|
return ERR_PTR(-EIO);
|
|
memset(fl4, 0, sizeof(*fl4));
|
fl4->flowi4_mark = skb->mark;
|
fl4->flowi4_proto = IPPROTO_UDP;
|
fl4->daddr = info->key.u.ipv4.dst;
|
fl4->saddr = info->key.u.ipv4.src;
|
fl4->fl4_dport = dport;
|
fl4->fl4_sport = sport;
|
|
tos = info->key.tos;
|
if ((tos == 1) && !geneve->collect_md) {
|
tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
|
use_cache = false;
|
}
|
fl4->flowi4_tos = RT_TOS(tos);
|
|
dst_cache = (struct dst_cache *)&info->dst_cache;
|
if (use_cache) {
|
rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
|
if (rt)
|
return rt;
|
}
|
rt = ip_route_output_key(geneve->net, fl4);
|
if (IS_ERR(rt)) {
|
netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
|
return ERR_PTR(-ENETUNREACH);
|
}
|
if (rt->dst.dev == dev) { /* is this necessary? */
|
netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
|
ip_rt_put(rt);
|
return ERR_PTR(-ELOOP);
|
}
|
if (use_cache)
|
dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
|
return rt;
|
}
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
|
struct net_device *dev,
|
struct geneve_sock *gs6,
|
struct flowi6 *fl6,
|
const struct ip_tunnel_info *info,
|
__be16 dport, __be16 sport)
|
{
|
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
|
struct geneve_dev *geneve = netdev_priv(dev);
|
struct dst_entry *dst = NULL;
|
struct dst_cache *dst_cache;
|
__u8 prio;
|
|
if (!gs6)
|
return ERR_PTR(-EIO);
|
|
memset(fl6, 0, sizeof(*fl6));
|
fl6->flowi6_mark = skb->mark;
|
fl6->flowi6_proto = IPPROTO_UDP;
|
fl6->daddr = info->key.u.ipv6.dst;
|
fl6->saddr = info->key.u.ipv6.src;
|
fl6->fl6_dport = dport;
|
fl6->fl6_sport = sport;
|
|
prio = info->key.tos;
|
if ((prio == 1) && !geneve->collect_md) {
|
prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
|
use_cache = false;
|
}
|
|
fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
|
info->key.label);
|
dst_cache = (struct dst_cache *)&info->dst_cache;
|
if (use_cache) {
|
dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
|
if (dst)
|
return dst;
|
}
|
dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
|
NULL);
|
if (IS_ERR(dst)) {
|
netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
|
return ERR_PTR(-ENETUNREACH);
|
}
|
if (dst->dev == dev) { /* is this necessary? */
|
netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
|
dst_release(dst);
|
return ERR_PTR(-ELOOP);
|
}
|
|
if (use_cache)
|
dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
|
return dst;
|
}
|
#endif
|
|
static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
|
struct geneve_dev *geneve,
|
const struct ip_tunnel_info *info)
|
{
|
bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
|
struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
|
const struct ip_tunnel_key *key = &info->key;
|
struct rtable *rt;
|
struct flowi4 fl4;
|
__u8 tos, ttl;
|
__be16 sport;
|
__be16 df;
|
int err;
|
|
if (!pskb_inet_may_pull(skb))
|
return -EINVAL;
|
|
sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
|
rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
|
geneve->info.key.tp_dst, sport);
|
if (IS_ERR(rt))
|
return PTR_ERR(rt);
|
|
skb_tunnel_check_pmtu(skb, &rt->dst,
|
GENEVE_IPV4_HLEN + info->options_len);
|
|
if (geneve->collect_md) {
|
tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
|
ttl = key->ttl;
|
} else {
|
tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
|
ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
|
}
|
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
|
|
err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
|
if (unlikely(err))
|
return err;
|
|
udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
|
tos, ttl, df, sport, geneve->info.key.tp_dst,
|
!net_eq(geneve->net, dev_net(geneve->dev)),
|
!(info->key.tun_flags & TUNNEL_CSUM));
|
return 0;
|
}
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
|
struct geneve_dev *geneve,
|
const struct ip_tunnel_info *info)
|
{
|
bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
|
struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
|
const struct ip_tunnel_key *key = &info->key;
|
struct dst_entry *dst = NULL;
|
struct flowi6 fl6;
|
__u8 prio, ttl;
|
__be16 sport;
|
int err;
|
|
if (!pskb_inet_may_pull(skb))
|
return -EINVAL;
|
|
sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
|
dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
|
geneve->info.key.tp_dst, sport);
|
if (IS_ERR(dst))
|
return PTR_ERR(dst);
|
|
skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
|
|
if (geneve->collect_md) {
|
prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
|
ttl = key->ttl;
|
} else {
|
prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
|
ip_hdr(skb), skb);
|
ttl = key->ttl ? : ip6_dst_hoplimit(dst);
|
}
|
err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
|
if (unlikely(err))
|
return err;
|
|
udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
|
&fl6.saddr, &fl6.daddr, prio, ttl,
|
info->key.label, sport, geneve->info.key.tp_dst,
|
!(info->key.tun_flags & TUNNEL_CSUM));
|
return 0;
|
}
|
#endif
|
|
static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
|
{
|
struct geneve_dev *geneve = netdev_priv(dev);
|
struct ip_tunnel_info *info = NULL;
|
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");
|
dev_kfree_skb(skb);
|
dev->stats.tx_dropped++;
|
return NETDEV_TX_OK;
|
}
|
} else {
|
info = &geneve->info;
|
}
|
|
rcu_read_lock();
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (info->mode & IP_TUNNEL_INFO_IPV6)
|
err = geneve6_xmit_skb(skb, dev, geneve, info);
|
else
|
#endif
|
err = geneve_xmit_skb(skb, dev, geneve, info);
|
rcu_read_unlock();
|
|
if (likely(!err))
|
return NETDEV_TX_OK;
|
|
dev_kfree_skb(skb);
|
|
if (err == -ELOOP)
|
dev->stats.collisions++;
|
else if (err == -ENETUNREACH)
|
dev->stats.tx_carrier_errors++;
|
|
dev->stats.tx_errors++;
|
return NETDEV_TX_OK;
|
}
|
|
static int geneve_change_mtu(struct net_device *dev, int new_mtu)
|
{
|
if (new_mtu > dev->max_mtu)
|
new_mtu = dev->max_mtu;
|
else if (new_mtu < dev->min_mtu)
|
new_mtu = dev->min_mtu;
|
|
dev->mtu = new_mtu;
|
return 0;
|
}
|
|
static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
|
{
|
struct ip_tunnel_info *info = skb_tunnel_info(skb);
|
struct geneve_dev *geneve = netdev_priv(dev);
|
__be16 sport;
|
|
if (ip_tunnel_info_af(info) == AF_INET) {
|
struct rtable *rt;
|
struct flowi4 fl4;
|
|
struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
|
sport = udp_flow_src_port(geneve->net, skb,
|
1, USHRT_MAX, true);
|
|
rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
|
geneve->info.key.tp_dst, sport);
|
if (IS_ERR(rt))
|
return PTR_ERR(rt);
|
|
ip_rt_put(rt);
|
info->key.u.ipv4.src = fl4.saddr;
|
#if IS_ENABLED(CONFIG_IPV6)
|
} else if (ip_tunnel_info_af(info) == AF_INET6) {
|
struct dst_entry *dst;
|
struct flowi6 fl6;
|
|
struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
|
sport = udp_flow_src_port(geneve->net, skb,
|
1, USHRT_MAX, true);
|
|
dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
|
geneve->info.key.tp_dst, sport);
|
if (IS_ERR(dst))
|
return PTR_ERR(dst);
|
|
dst_release(dst);
|
info->key.u.ipv6.src = fl6.saddr;
|
#endif
|
} else {
|
return -EINVAL;
|
}
|
|
info->key.tp_src = sport;
|
info->key.tp_dst = geneve->info.key.tp_dst;
|
return 0;
|
}
|
|
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 = geneve_change_mtu,
|
.ndo_validate_addr = eth_validate_addr,
|
.ndo_set_mac_address = eth_mac_addr,
|
.ndo_fill_metadata_dst = geneve_fill_metadata_dst,
|
};
|
|
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",
|
};
|
|
/* Calls the ndo_udp_tunnel_add of the caller in order to
|
* supply the listening GENEVE udp ports. Callers are expected
|
* to implement the ndo_udp_tunnel_add.
|
*/
|
static void geneve_offload_rx_ports(struct net_device *dev, bool push)
|
{
|
struct net *net = dev_net(dev);
|
struct geneve_net *gn = net_generic(net, geneve_net_id);
|
struct geneve_sock *gs;
|
|
rcu_read_lock();
|
list_for_each_entry_rcu(gs, &gn->sock_list, list) {
|
if (push) {
|
udp_tunnel_push_rx_port(dev, gs->sock,
|
UDP_TUNNEL_TYPE_GENEVE);
|
} else {
|
udp_tunnel_drop_rx_port(dev, gs->sock,
|
UDP_TUNNEL_TYPE_GENEVE);
|
}
|
}
|
rcu_read_unlock();
|
}
|
|
/* 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->needs_free_netdev = true;
|
|
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;
|
|
/* MTU range: 68 - (something less than 65535) */
|
dev->min_mtu = ETH_MIN_MTU;
|
/* The max_mtu calculation does not take account of GENEVE
|
* options, to avoid excluding potentially valid
|
* configurations. This will be further reduced by IPvX hdr size.
|
*/
|
dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
|
|
netif_keep_dst(dev);
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
|
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_REMOTE6] = { .len = sizeof(struct in6_addr) },
|
[IFLA_GENEVE_TTL] = { .type = NLA_U8 },
|
[IFLA_GENEVE_TOS] = { .type = NLA_U8 },
|
[IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
|
[IFLA_GENEVE_PORT] = { .type = NLA_U16 },
|
[IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
|
[IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
|
[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
|
[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
|
};
|
|
static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
if (tb[IFLA_ADDRESS]) {
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
|
"Provided link layer address is not Ethernet");
|
return -EINVAL;
|
}
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
|
"Provided Ethernet address is not unicast");
|
return -EADDRNOTAVAIL;
|
}
|
}
|
|
if (!data) {
|
NL_SET_ERR_MSG(extack,
|
"Not enough attributes provided to perform the operation");
|
return -EINVAL;
|
}
|
|
if (data[IFLA_GENEVE_ID]) {
|
__u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
|
|
if (vni >= GENEVE_N_VID) {
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
|
"Geneve ID must be lower than 16777216");
|
return -ERANGE;
|
}
|
}
|
|
return 0;
|
}
|
|
static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
|
const struct ip_tunnel_info *info,
|
bool *tun_on_same_port,
|
bool *tun_collect_md)
|
{
|
struct geneve_dev *geneve, *t = NULL;
|
|
*tun_on_same_port = false;
|
*tun_collect_md = false;
|
list_for_each_entry(geneve, &gn->geneve_list, next) {
|
if (info->key.tp_dst == geneve->info.key.tp_dst) {
|
*tun_collect_md = geneve->collect_md;
|
*tun_on_same_port = true;
|
}
|
if (info->key.tun_id == geneve->info.key.tun_id &&
|
info->key.tp_dst == geneve->info.key.tp_dst &&
|
!memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
|
t = geneve;
|
}
|
return t;
|
}
|
|
static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
|
{
|
return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
|
info->key.ttl || info->key.label || info->key.tp_src ||
|
memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
|
}
|
|
static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
|
struct ip_tunnel_info *b)
|
{
|
if (ip_tunnel_info_af(a) == AF_INET)
|
return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
|
else
|
return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
|
}
|
|
static int geneve_configure(struct net *net, struct net_device *dev,
|
struct netlink_ext_ack *extack,
|
const struct ip_tunnel_info *info,
|
bool metadata, bool ipv6_rx_csum)
|
{
|
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, encap_len;
|
|
if (metadata && !is_tnl_info_zero(info)) {
|
NL_SET_ERR_MSG(extack,
|
"Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
|
return -EINVAL;
|
}
|
|
geneve->net = net;
|
geneve->dev = dev;
|
|
t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
|
if (t)
|
return -EBUSY;
|
|
/* make enough headroom for basic scenario */
|
encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
|
if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
|
encap_len += sizeof(struct iphdr);
|
dev->max_mtu -= sizeof(struct iphdr);
|
} else {
|
encap_len += sizeof(struct ipv6hdr);
|
dev->max_mtu -= sizeof(struct ipv6hdr);
|
}
|
dev->needed_headroom = encap_len + ETH_HLEN;
|
|
if (metadata) {
|
if (tun_on_same_port) {
|
NL_SET_ERR_MSG(extack,
|
"There can be only one externally controlled device on a destination port");
|
return -EPERM;
|
}
|
} else {
|
if (tun_collect_md) {
|
NL_SET_ERR_MSG(extack,
|
"There already exists an externally controlled device on this destination port");
|
return -EPERM;
|
}
|
}
|
|
dst_cache_reset(&geneve->info.dst_cache);
|
geneve->info = *info;
|
geneve->collect_md = metadata;
|
geneve->use_udp6_rx_checksums = ipv6_rx_csum;
|
|
err = register_netdevice(dev);
|
if (err)
|
return err;
|
|
list_add(&geneve->next, &gn->geneve_list);
|
return 0;
|
}
|
|
static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
|
{
|
memset(info, 0, sizeof(*info));
|
info->key.tp_dst = htons(dst_port);
|
}
|
|
static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
|
struct netlink_ext_ack *extack,
|
struct ip_tunnel_info *info, bool *metadata,
|
bool *use_udp6_rx_checksums, bool changelink)
|
{
|
int attrtype;
|
|
if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
|
NL_SET_ERR_MSG(extack,
|
"Cannot specify both IPv4 and IPv6 Remote addresses");
|
return -EINVAL;
|
}
|
|
if (data[IFLA_GENEVE_REMOTE]) {
|
if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
|
attrtype = IFLA_GENEVE_REMOTE;
|
goto change_notsup;
|
}
|
|
info->key.u.ipv4.dst =
|
nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
|
|
if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
|
"Remote IPv4 address cannot be Multicast");
|
return -EINVAL;
|
}
|
}
|
|
if (data[IFLA_GENEVE_REMOTE6]) {
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
|
attrtype = IFLA_GENEVE_REMOTE6;
|
goto change_notsup;
|
}
|
|
info->mode = IP_TUNNEL_INFO_IPV6;
|
info->key.u.ipv6.dst =
|
nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
|
|
if (ipv6_addr_type(&info->key.u.ipv6.dst) &
|
IPV6_ADDR_LINKLOCAL) {
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
|
"Remote IPv6 address cannot be link-local");
|
return -EINVAL;
|
}
|
if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
|
"Remote IPv6 address cannot be Multicast");
|
return -EINVAL;
|
}
|
info->key.tun_flags |= TUNNEL_CSUM;
|
*use_udp6_rx_checksums = true;
|
#else
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
|
"IPv6 support not enabled in the kernel");
|
return -EPFNOSUPPORT;
|
#endif
|
}
|
|
if (data[IFLA_GENEVE_ID]) {
|
__u32 vni;
|
__u8 tvni[3];
|
__be64 tunid;
|
|
vni = nla_get_u32(data[IFLA_GENEVE_ID]);
|
tvni[0] = (vni & 0x00ff0000) >> 16;
|
tvni[1] = (vni & 0x0000ff00) >> 8;
|
tvni[2] = vni & 0x000000ff;
|
|
tunid = vni_to_tunnel_id(tvni);
|
if (changelink && (tunid != info->key.tun_id)) {
|
attrtype = IFLA_GENEVE_ID;
|
goto change_notsup;
|
}
|
info->key.tun_id = tunid;
|
}
|
|
if (data[IFLA_GENEVE_TTL])
|
info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
|
|
if (data[IFLA_GENEVE_TOS])
|
info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
|
|
if (data[IFLA_GENEVE_LABEL]) {
|
info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
|
IPV6_FLOWLABEL_MASK;
|
if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
|
"Label attribute only applies for IPv6 Geneve devices");
|
return -EINVAL;
|
}
|
}
|
|
if (data[IFLA_GENEVE_PORT]) {
|
if (changelink) {
|
attrtype = IFLA_GENEVE_PORT;
|
goto change_notsup;
|
}
|
info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
|
}
|
|
if (data[IFLA_GENEVE_COLLECT_METADATA]) {
|
if (changelink) {
|
attrtype = IFLA_GENEVE_COLLECT_METADATA;
|
goto change_notsup;
|
}
|
*metadata = true;
|
}
|
|
if (data[IFLA_GENEVE_UDP_CSUM]) {
|
if (changelink) {
|
attrtype = IFLA_GENEVE_UDP_CSUM;
|
goto change_notsup;
|
}
|
if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
|
info->key.tun_flags |= TUNNEL_CSUM;
|
}
|
|
if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (changelink) {
|
attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
|
goto change_notsup;
|
}
|
if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
|
info->key.tun_flags &= ~TUNNEL_CSUM;
|
#else
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
|
"IPv6 support not enabled in the kernel");
|
return -EPFNOSUPPORT;
|
#endif
|
}
|
|
if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (changelink) {
|
attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
|
goto change_notsup;
|
}
|
if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
|
*use_udp6_rx_checksums = false;
|
#else
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
|
"IPv6 support not enabled in the kernel");
|
return -EPFNOSUPPORT;
|
#endif
|
}
|
|
return 0;
|
change_notsup:
|
NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
|
"Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
|
return -EOPNOTSUPP;
|
}
|
|
static void geneve_link_config(struct net_device *dev,
|
struct ip_tunnel_info *info, struct nlattr *tb[])
|
{
|
struct geneve_dev *geneve = netdev_priv(dev);
|
int ldev_mtu = 0;
|
|
if (tb[IFLA_MTU]) {
|
geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
|
return;
|
}
|
|
switch (ip_tunnel_info_af(info)) {
|
case AF_INET: {
|
struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
|
struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
|
|
if (!IS_ERR(rt) && rt->dst.dev) {
|
ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
|
ip_rt_put(rt);
|
}
|
break;
|
}
|
#if IS_ENABLED(CONFIG_IPV6)
|
case AF_INET6: {
|
struct rt6_info *rt;
|
|
if (!__in6_dev_get(dev))
|
break;
|
|
rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
|
NULL, 0);
|
|
if (rt && rt->dst.dev)
|
ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
|
ip6_rt_put(rt);
|
break;
|
}
|
#endif
|
}
|
|
if (ldev_mtu <= 0)
|
return;
|
|
geneve_change_mtu(dev, ldev_mtu - info->options_len);
|
}
|
|
static int geneve_newlink(struct net *net, struct net_device *dev,
|
struct nlattr *tb[], struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
bool use_udp6_rx_checksums = false;
|
struct ip_tunnel_info info;
|
bool metadata = false;
|
int err;
|
|
init_tnl_info(&info, GENEVE_UDP_PORT);
|
err = geneve_nl2info(tb, data, extack, &info, &metadata,
|
&use_udp6_rx_checksums, false);
|
if (err)
|
return err;
|
|
err = geneve_configure(net, dev, extack, &info, metadata,
|
use_udp6_rx_checksums);
|
if (err)
|
return err;
|
|
geneve_link_config(dev, &info, tb);
|
|
return 0;
|
}
|
|
/* Quiesces the geneve device data path for both TX and RX.
|
*
|
* On transmit geneve checks for non-NULL geneve_sock before it proceeds.
|
* So, if we set that socket to NULL under RCU and wait for synchronize_net()
|
* to complete for the existing set of in-flight packets to be transmitted,
|
* then we would have quiesced the transmit data path. All the future packets
|
* will get dropped until we unquiesce the data path.
|
*
|
* On receive geneve dereference the geneve_sock stashed in the socket. So,
|
* if we set that to NULL under RCU and wait for synchronize_net() to
|
* complete, then we would have quiesced the receive data path.
|
*/
|
static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
|
struct geneve_sock **gs6)
|
{
|
*gs4 = rtnl_dereference(geneve->sock4);
|
rcu_assign_pointer(geneve->sock4, NULL);
|
if (*gs4)
|
rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
|
#if IS_ENABLED(CONFIG_IPV6)
|
*gs6 = rtnl_dereference(geneve->sock6);
|
rcu_assign_pointer(geneve->sock6, NULL);
|
if (*gs6)
|
rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
|
#else
|
*gs6 = NULL;
|
#endif
|
synchronize_net();
|
}
|
|
/* Resumes the geneve device data path for both TX and RX. */
|
static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
|
struct geneve_sock __maybe_unused *gs6)
|
{
|
rcu_assign_pointer(geneve->sock4, gs4);
|
if (gs4)
|
rcu_assign_sk_user_data(gs4->sock->sk, gs4);
|
#if IS_ENABLED(CONFIG_IPV6)
|
rcu_assign_pointer(geneve->sock6, gs6);
|
if (gs6)
|
rcu_assign_sk_user_data(gs6->sock->sk, gs6);
|
#endif
|
synchronize_net();
|
}
|
|
static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
|
struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
struct geneve_dev *geneve = netdev_priv(dev);
|
struct geneve_sock *gs4, *gs6;
|
struct ip_tunnel_info info;
|
bool metadata;
|
bool use_udp6_rx_checksums;
|
int err;
|
|
/* If the geneve device is configured for metadata (or externally
|
* controlled, for example, OVS), then nothing can be changed.
|
*/
|
if (geneve->collect_md)
|
return -EOPNOTSUPP;
|
|
/* Start with the existing info. */
|
memcpy(&info, &geneve->info, sizeof(info));
|
metadata = geneve->collect_md;
|
use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
|
err = geneve_nl2info(tb, data, extack, &info, &metadata,
|
&use_udp6_rx_checksums, true);
|
if (err)
|
return err;
|
|
if (!geneve_dst_addr_equal(&geneve->info, &info)) {
|
dst_cache_reset(&info.dst_cache);
|
geneve_link_config(dev, &info, tb);
|
}
|
|
geneve_quiesce(geneve, &gs4, &gs6);
|
geneve->info = info;
|
geneve->collect_md = metadata;
|
geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
|
geneve_unquiesce(geneve, gs4, gs6);
|
|
return 0;
|
}
|
|
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 in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
|
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
|
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
|
nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
|
nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
|
nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
|
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
|
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
|
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
|
0;
|
}
|
|
static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
{
|
struct geneve_dev *geneve = netdev_priv(dev);
|
struct ip_tunnel_info *info = &geneve->info;
|
bool metadata = geneve->collect_md;
|
__u8 tmp_vni[3];
|
__u32 vni;
|
|
tunnel_id_to_vni(info->key.tun_id, tmp_vni);
|
vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
|
if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
|
goto nla_put_failure;
|
|
if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
|
if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
|
info->key.u.ipv4.dst))
|
goto nla_put_failure;
|
if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
|
!!(info->key.tun_flags & TUNNEL_CSUM)))
|
goto nla_put_failure;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
} else if (!metadata) {
|
if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
|
&info->key.u.ipv6.dst))
|
goto nla_put_failure;
|
if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
|
!(info->key.tun_flags & TUNNEL_CSUM)))
|
goto nla_put_failure;
|
#endif
|
}
|
|
if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
|
nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
|
nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
|
goto nla_put_failure;
|
|
if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
|
goto nla_put_failure;
|
|
if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
|
goto nla_put_failure;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
|
!geneve->use_udp6_rx_checksums))
|
goto nla_put_failure;
|
#endif
|
|
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,
|
.changelink = geneve_changelink,
|
.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 ip_tunnel_info info;
|
struct net_device *dev;
|
LIST_HEAD(list_kill);
|
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;
|
|
init_tnl_info(&info, dst_port);
|
err = geneve_configure(net, dev, NULL, &info, true, true);
|
if (err) {
|
free_netdev(dev);
|
return ERR_PTR(err);
|
}
|
|
/* openvswitch users expect packet sizes to be unrestricted,
|
* so set the largest MTU we can.
|
*/
|
err = geneve_change_mtu(dev, IP_MAX_MTU);
|
if (err)
|
goto err;
|
|
err = rtnl_configure_link(dev, NULL);
|
if (err < 0)
|
goto err;
|
|
return dev;
|
err:
|
geneve_dellink(dev, &list_kill);
|
unregister_netdevice_many(&list_kill);
|
return ERR_PTR(err);
|
}
|
EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
|
|
static int geneve_netdevice_event(struct notifier_block *unused,
|
unsigned long event, void *ptr)
|
{
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
|
event == NETDEV_UDP_TUNNEL_DROP_INFO) {
|
geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
|
} else if (event == NETDEV_UNREGISTER) {
|
geneve_offload_rx_ports(dev, false);
|
} else if (event == NETDEV_REGISTER) {
|
geneve_offload_rx_ports(dev, true);
|
}
|
|
return NOTIFY_DONE;
|
}
|
|
static struct notifier_block geneve_notifier_block __read_mostly = {
|
.notifier_call = geneve_netdevice_event,
|
};
|
|
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 geneve_destroy_tunnels(struct net *net, struct list_head *head)
|
{
|
struct geneve_net *gn = net_generic(net, geneve_net_id);
|
struct geneve_dev *geneve, *next;
|
struct net_device *dev, *aux;
|
|
/* 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, head);
|
|
/* 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, head);
|
}
|
}
|
|
static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
|
{
|
struct net *net;
|
LIST_HEAD(list);
|
|
rtnl_lock();
|
list_for_each_entry(net, net_list, exit_list)
|
geneve_destroy_tunnels(net, &list);
|
|
/* unregister the devices gathered above */
|
unregister_netdevice_many(&list);
|
rtnl_unlock();
|
|
list_for_each_entry(net, net_list, exit_list) {
|
const struct geneve_net *gn = net_generic(net, geneve_net_id);
|
|
WARN_ON_ONCE(!list_empty(&gn->sock_list));
|
}
|
}
|
|
static struct pernet_operations geneve_net_ops = {
|
.init = geneve_init_net,
|
.exit_batch = geneve_exit_batch_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 = register_netdevice_notifier(&geneve_notifier_block);
|
if (rc)
|
goto out2;
|
|
rc = rtnl_link_register(&geneve_link_ops);
|
if (rc)
|
goto out3;
|
|
return 0;
|
out3:
|
unregister_netdevice_notifier(&geneve_notifier_block);
|
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_netdevice_notifier(&geneve_notifier_block);
|
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");
|
