v4.19.13 snapshot.
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
new file mode 100644
index 0000000..493cd38
--- /dev/null
+++ b/drivers/net/geneve.c
@@ -0,0 +1,1782 @@
+/*
+ * GENEVE: Generic Network Virtualization Encapsulation
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/etherdevice.h>
+#include <linux/hash.h>
+#include <net/dst_metadata.h>
+#include <net/gro_cells.h>
+#include <net/rtnetlink.h>
+#include <net/geneve.h>
+#include <net/protocol.h>
+
+#define GENEVE_NETDEV_VER "0.6"
+
+#define GENEVE_UDP_PORT 6081
+
+#define GENEVE_N_VID (1u << 24)
+#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
+
+#define VNI_HASH_BITS 10
+#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
+
+static bool log_ecn_error = true;
+module_param(log_ecn_error, bool, 0644);
+MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+
+#define GENEVE_VER 0
+#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
+#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
+#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
+
+/* per-network namespace private data for this module */
+struct geneve_net {
+ struct list_head geneve_list;
+ struct list_head sock_list;
+};
+
+static unsigned int geneve_net_id;
+
+struct geneve_dev_node {
+ struct hlist_node hlist;
+ struct geneve_dev *geneve;
+};
+
+/* Pseudo network device */
+struct geneve_dev {
+ struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
+#if IS_ENABLED(CONFIG_IPV6)
+ struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
+#endif
+ struct net *net; /* netns for packet i/o */
+ struct net_device *dev; /* netdev for geneve tunnel */
+ struct ip_tunnel_info info;
+ struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
+#if IS_ENABLED(CONFIG_IPV6)
+ struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
+#endif
+ struct list_head next; /* geneve's per namespace list */
+ struct gro_cells gro_cells;
+ bool collect_md;
+ bool use_udp6_rx_checksums;
+};
+
+struct geneve_sock {
+ bool collect_md;
+ struct list_head list;
+ struct socket *sock;
+ struct rcu_head rcu;
+ int refcnt;
+ struct hlist_head vni_list[VNI_HASH_SIZE];
+};
+
+static inline __u32 geneve_net_vni_hash(u8 vni[3])
+{
+ __u32 vnid;
+
+ vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
+ return hash_32(vnid, VNI_HASH_BITS);
+}
+
+static __be64 vni_to_tunnel_id(const __u8 *vni)
+{
+#ifdef __BIG_ENDIAN
+ return (vni[0] << 16) | (vni[1] << 8) | vni[2];
+#else
+ return (__force __be64)(((__force u64)vni[0] << 40) |
+ ((__force u64)vni[1] << 48) |
+ ((__force u64)vni[2] << 56));
+#endif
+}
+
+/* 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 bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
+{
+ return !memcmp(vni, &tun_id[5], 3);
+}
+
+static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
+{
+ return gs->sock->sk->sk_family;
+}
+
+static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
+ __be32 addr, u8 vni[])
+{
+ struct hlist_head *vni_list_head;
+ struct geneve_dev_node *node;
+ __u32 hash;
+
+ /* Find the device for this VNI */
+ hash = geneve_net_vni_hash(vni);
+ vni_list_head = &gs->vni_list[hash];
+ hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
+ if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
+ addr == node->geneve->info.key.u.ipv4.dst)
+ return node->geneve;
+ }
+ return NULL;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
+ struct in6_addr addr6, u8 vni[])
+{
+ struct hlist_head *vni_list_head;
+ struct geneve_dev_node *node;
+ __u32 hash;
+
+ /* Find the device for this VNI */
+ hash = geneve_net_vni_hash(vni);
+ vni_list_head = &gs->vni_list[hash];
+ hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
+ if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
+ ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
+ return node->geneve;
+ }
+ return NULL;
+}
+#endif
+
+static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
+{
+ return (struct genevehdr *)(udp_hdr(skb) + 1);
+}
+
+static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
+ struct sk_buff *skb)
+{
+ static u8 zero_vni[3];
+ u8 *vni;
+
+ if (geneve_get_sk_family(gs) == AF_INET) {
+ struct iphdr *iph;
+ __be32 addr;
+
+ iph = ip_hdr(skb); /* outer IP header... */
+
+ if (gs->collect_md) {
+ vni = zero_vni;
+ addr = 0;
+ } else {
+ vni = geneve_hdr(skb)->vni;
+ addr = iph->saddr;
+ }
+
+ return geneve_lookup(gs, addr, vni);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else if (geneve_get_sk_family(gs) == AF_INET6) {
+ static struct in6_addr zero_addr6;
+ struct ipv6hdr *ip6h;
+ struct in6_addr addr6;
+
+ ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
+
+ if (gs->collect_md) {
+ vni = zero_vni;
+ addr6 = zero_addr6;
+ } else {
+ vni = geneve_hdr(skb)->vni;
+ addr6 = ip6h->saddr;
+ }
+
+ return geneve6_lookup(gs, addr6, vni);
+#endif
+ }
+ return NULL;
+}
+
+/* geneve receive/decap routine */
+static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
+ struct sk_buff *skb)
+{
+ struct genevehdr *gnvh = geneve_hdr(skb);
+ struct metadata_dst *tun_dst = NULL;
+ struct pcpu_sw_netstats *stats;
+ unsigned int len;
+ int err = 0;
+ void *oiph;
+
+ if (ip_tunnel_collect_metadata() || gs->collect_md) {
+ __be16 flags;
+
+ flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
+ (gnvh->oam ? TUNNEL_OAM : 0) |
+ (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
+
+ tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
+ vni_to_tunnel_id(gnvh->vni),
+ gnvh->opt_len * 4);
+ if (!tun_dst) {
+ geneve->dev->stats.rx_dropped++;
+ goto drop;
+ }
+ /* Update tunnel dst according to Geneve options. */
+ ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
+ gnvh->options, gnvh->opt_len * 4,
+ TUNNEL_GENEVE_OPT);
+ } else {
+ /* Drop packets w/ critical options,
+ * since we don't support any...
+ */
+ if (gnvh->critical) {
+ geneve->dev->stats.rx_frame_errors++;
+ geneve->dev->stats.rx_errors++;
+ goto drop;
+ }
+ }
+
+ skb_reset_mac_header(skb);
+ skb->protocol = eth_type_trans(skb, geneve->dev);
+ skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+
+ if (tun_dst)
+ skb_dst_set(skb, &tun_dst->dst);
+
+ /* Ignore packet loops (and multicast echo) */
+ if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
+ geneve->dev->stats.rx_errors++;
+ goto drop;
+ }
+
+ oiph = skb_network_header(skb);
+ skb_reset_network_header(skb);
+
+ if (geneve_get_sk_family(gs) == AF_INET)
+ err = IP_ECN_decapsulate(oiph, skb);
+#if IS_ENABLED(CONFIG_IPV6)
+ else
+ err = IP6_ECN_decapsulate(oiph, skb);
+#endif
+
+ if (unlikely(err)) {
+ if (log_ecn_error) {
+ if (geneve_get_sk_family(gs) == AF_INET)
+ net_info_ratelimited("non-ECT from %pI4 "
+ "with TOS=%#x\n",
+ &((struct iphdr *)oiph)->saddr,
+ ((struct iphdr *)oiph)->tos);
+#if IS_ENABLED(CONFIG_IPV6)
+ else
+ net_info_ratelimited("non-ECT from %pI6\n",
+ &((struct ipv6hdr *)oiph)->saddr);
+#endif
+ }
+ if (err > 1) {
+ ++geneve->dev->stats.rx_frame_errors;
+ ++geneve->dev->stats.rx_errors;
+ goto drop;
+ }
+ }
+
+ len = skb->len;
+ err = gro_cells_receive(&geneve->gro_cells, skb);
+ if (likely(err == NET_RX_SUCCESS)) {
+ stats = this_cpu_ptr(geneve->dev->tstats);
+ u64_stats_update_begin(&stats->syncp);
+ stats->rx_packets++;
+ stats->rx_bytes += len;
+ u64_stats_update_end(&stats->syncp);
+ }
+ return;
+drop:
+ /* Consume bad packet */
+ kfree_skb(skb);
+}
+
+/* Setup stats when device is created */
+static int geneve_init(struct net_device *dev)
+{
+ struct geneve_dev *geneve = netdev_priv(dev);
+ int err;
+
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ err = gro_cells_init(&geneve->gro_cells, dev);
+ if (err) {
+ free_percpu(dev->tstats);
+ return err;
+ }
+
+ err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
+ if (err) {
+ free_percpu(dev->tstats);
+ gro_cells_destroy(&geneve->gro_cells);
+ return err;
+ }
+ return 0;
+}
+
+static void geneve_uninit(struct net_device *dev)
+{
+ struct geneve_dev *geneve = netdev_priv(dev);
+
+ dst_cache_destroy(&geneve->info.dst_cache);
+ gro_cells_destroy(&geneve->gro_cells);
+ free_percpu(dev->tstats);
+}
+
+/* Callback from net/ipv4/udp.c to receive packets */
+static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
+{
+ struct genevehdr *geneveh;
+ struct geneve_dev *geneve;
+ struct geneve_sock *gs;
+ int opts_len;
+
+ /* Need UDP and Geneve header to be present */
+ if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
+ goto drop;
+
+ /* Return packets with reserved bits set */
+ geneveh = geneve_hdr(skb);
+ if (unlikely(geneveh->ver != GENEVE_VER))
+ goto drop;
+
+ if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
+ goto drop;
+
+ gs = rcu_dereference_sk_user_data(sk);
+ if (!gs)
+ goto drop;
+
+ geneve = geneve_lookup_skb(gs, skb);
+ if (!geneve)
+ goto drop;
+
+ opts_len = geneveh->opt_len * 4;
+ if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
+ htons(ETH_P_TEB),
+ !net_eq(geneve->net, dev_net(geneve->dev)))) {
+ geneve->dev->stats.rx_dropped++;
+ goto drop;
+ }
+
+ geneve_rx(geneve, gs, skb);
+ return 0;
+
+drop:
+ /* Consume bad packet */
+ kfree_skb(skb);
+ return 0;
+}
+
+static struct socket *geneve_create_sock(struct net *net, bool ipv6,
+ __be16 port, bool ipv6_rx_csum)
+{
+ struct socket *sock;
+ struct udp_port_cfg udp_conf;
+ int err;
+
+ memset(&udp_conf, 0, sizeof(udp_conf));
+
+ if (ipv6) {
+ udp_conf.family = AF_INET6;
+ udp_conf.ipv6_v6only = 1;
+ udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
+ } else {
+ udp_conf.family = AF_INET;
+ udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
+ }
+
+ udp_conf.local_udp_port = port;
+
+ /* Open UDP socket */
+ err = udp_sock_create(net, &udp_conf, &sock);
+ if (err < 0)
+ return ERR_PTR(err);
+
+ return sock;
+}
+
+static int geneve_hlen(struct genevehdr *gh)
+{
+ return sizeof(*gh) + gh->opt_len * 4;
+}
+
+static struct sk_buff *geneve_gro_receive(struct sock *sk,
+ struct list_head *head,
+ struct sk_buff *skb)
+{
+ struct sk_buff *pp = NULL;
+ struct sk_buff *p;
+ struct genevehdr *gh, *gh2;
+ unsigned int hlen, gh_len, off_gnv;
+ const struct packet_offload *ptype;
+ __be16 type;
+ int flush = 1;
+
+ off_gnv = skb_gro_offset(skb);
+ hlen = off_gnv + sizeof(*gh);
+ gh = skb_gro_header_fast(skb, off_gnv);
+ if (skb_gro_header_hard(skb, hlen)) {
+ gh = skb_gro_header_slow(skb, hlen, off_gnv);
+ if (unlikely(!gh))
+ goto out;
+ }
+
+ if (gh->ver != GENEVE_VER || gh->oam)
+ goto out;
+ gh_len = geneve_hlen(gh);
+
+ hlen = off_gnv + gh_len;
+ if (skb_gro_header_hard(skb, hlen)) {
+ gh = skb_gro_header_slow(skb, hlen, off_gnv);
+ if (unlikely(!gh))
+ goto out;
+ }
+
+ list_for_each_entry(p, head, list) {
+ if (!NAPI_GRO_CB(p)->same_flow)
+ continue;
+
+ gh2 = (struct genevehdr *)(p->data + off_gnv);
+ if (gh->opt_len != gh2->opt_len ||
+ memcmp(gh, gh2, gh_len)) {
+ NAPI_GRO_CB(p)->same_flow = 0;
+ continue;
+ }
+ }
+
+ type = gh->proto_type;
+
+ rcu_read_lock();
+ ptype = gro_find_receive_by_type(type);
+ if (!ptype)
+ goto out_unlock;
+
+ skb_gro_pull(skb, gh_len);
+ skb_gro_postpull_rcsum(skb, gh, gh_len);
+ pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
+ flush = 0;
+
+out_unlock:
+ rcu_read_unlock();
+out:
+ skb_gro_flush_final(skb, pp, flush);
+
+ return pp;
+}
+
+static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
+ int nhoff)
+{
+ struct genevehdr *gh;
+ struct packet_offload *ptype;
+ __be16 type;
+ int gh_len;
+ int err = -ENOSYS;
+
+ gh = (struct genevehdr *)(skb->data + nhoff);
+ gh_len = geneve_hlen(gh);
+ type = gh->proto_type;
+
+ rcu_read_lock();
+ ptype = gro_find_complete_by_type(type);
+ if (ptype)
+ err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
+
+ rcu_read_unlock();
+
+ skb_set_inner_mac_header(skb, nhoff + gh_len);
+
+ return err;
+}
+
+/* Create new listen socket if needed */
+static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
+ 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;
+ int h;
+
+ gs = kzalloc(sizeof(*gs), GFP_KERNEL);
+ if (!gs)
+ 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 */
+ 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 ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
+ bool metadata = geneve->collect_md;
+ int ret = 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (ipv6 || metadata)
+ ret = geneve_sock_add(geneve, true);
+#endif
+ if (!ret && (!ipv6 || metadata))
+ 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)
+{
+ 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;
+
+ 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)
+{
+ 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;
+ 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;
+ }
+ if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
+ 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;
+
+ rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
+ if (IS_ERR(rt))
+ return PTR_ERR(rt);
+
+ skb_tunnel_check_pmtu(skb, &rt->dst,
+ GENEVE_IPV4_HLEN + info->options_len);
+
+ sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
+ 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;
+
+ dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
+ if (IS_ERR(dst))
+ return PTR_ERR(dst);
+
+ skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
+
+ sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
+ 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))) {
+ err = -EINVAL;
+ netdev_dbg(dev, "no tunnel metadata\n");
+ goto tx_error;
+ }
+ } 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;
+tx_error:
+ 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);
+
+ if (ip_tunnel_info_af(info) == AF_INET) {
+ struct rtable *rt;
+ struct flowi4 fl4;
+ struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
+
+ rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
+ 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);
+
+ dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
+ 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 = udp_flow_src_port(geneve->net, skb,
+ 1, USHRT_MAX, true);
+ 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 = 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);
+ }
+
+ WARN_ON_ONCE(!list_empty(&gn->sock_list));
+}
+
+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();
+}
+
+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");