linux/drivers/net/geneve.c
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   1/*
   2 * GENEVE: Generic Network Virtualization Encapsulation
   3 *
   4 * Copyright (c) 2015 Red Hat, Inc.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/netdevice.h>
  16#include <linux/etherdevice.h>
  17#include <linux/hash.h>
  18#include <net/dst_metadata.h>
  19#include <net/gro_cells.h>
  20#include <net/rtnetlink.h>
  21#include <net/geneve.h>
  22#include <net/protocol.h>
  23
  24#define GENEVE_NETDEV_VER       "0.6"
  25
  26#define GENEVE_UDP_PORT         6081
  27
  28#define GENEVE_N_VID            (1u << 24)
  29#define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  30
  31#define VNI_HASH_BITS           10
  32#define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  33
  34static bool log_ecn_error = true;
  35module_param(log_ecn_error, bool, 0644);
  36MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  37
  38#define GENEVE_VER 0
  39#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  40
  41/* per-network namespace private data for this module */
  42struct geneve_net {
  43        struct list_head        geneve_list;
  44        struct list_head        sock_list;
  45};
  46
  47static int geneve_net_id;
  48
  49union geneve_addr {
  50        struct sockaddr_in sin;
  51        struct sockaddr_in6 sin6;
  52        struct sockaddr sa;
  53};
  54
  55static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };
  56
  57/* Pseudo network device */
  58struct geneve_dev {
  59        struct hlist_node  hlist;       /* vni hash table */
  60        struct net         *net;        /* netns for packet i/o */
  61        struct net_device  *dev;        /* netdev for geneve tunnel */
  62        struct geneve_sock *sock4;      /* IPv4 socket used for geneve tunnel */
  63#if IS_ENABLED(CONFIG_IPV6)
  64        struct geneve_sock *sock6;      /* IPv6 socket used for geneve tunnel */
  65#endif
  66        u8                 vni[3];      /* virtual network ID for tunnel */
  67        u8                 ttl;         /* TTL override */
  68        u8                 tos;         /* TOS override */
  69        union geneve_addr  remote;      /* IP address for link partner */
  70        struct list_head   next;        /* geneve's per namespace list */
  71        __be16             dst_port;
  72        bool               collect_md;
  73        struct gro_cells   gro_cells;
  74        u32                flags;
  75};
  76
  77/* Geneve device flags */
  78#define GENEVE_F_UDP_CSUM               BIT(0)
  79#define GENEVE_F_UDP_ZERO_CSUM6_TX      BIT(1)
  80#define GENEVE_F_UDP_ZERO_CSUM6_RX      BIT(2)
  81
  82struct geneve_sock {
  83        bool                    collect_md;
  84        struct list_head        list;
  85        struct socket           *sock;
  86        struct rcu_head         rcu;
  87        int                     refcnt;
  88        struct udp_offload      udp_offloads;
  89        struct hlist_head       vni_list[VNI_HASH_SIZE];
  90        u32                     flags;
  91};
  92
  93static inline __u32 geneve_net_vni_hash(u8 vni[3])
  94{
  95        __u32 vnid;
  96
  97        vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  98        return hash_32(vnid, VNI_HASH_BITS);
  99}
 100
 101static __be64 vni_to_tunnel_id(const __u8 *vni)
 102{
 103#ifdef __BIG_ENDIAN
 104        return (vni[0] << 16) | (vni[1] << 8) | vni[2];
 105#else
 106        return (__force __be64)(((__force u64)vni[0] << 40) |
 107                                ((__force u64)vni[1] << 48) |
 108                                ((__force u64)vni[2] << 56));
 109#endif
 110}
 111
 112static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 113                                        __be32 addr, u8 vni[])
 114{
 115        struct hlist_head *vni_list_head;
 116        struct geneve_dev *geneve;
 117        __u32 hash;
 118
 119        /* Find the device for this VNI */
 120        hash = geneve_net_vni_hash(vni);
 121        vni_list_head = &gs->vni_list[hash];
 122        hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
 123                if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
 124                    addr == geneve->remote.sin.sin_addr.s_addr)
 125                        return geneve;
 126        }
 127        return NULL;
 128}
 129
 130#if IS_ENABLED(CONFIG_IPV6)
 131static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 132                                         struct in6_addr addr6, u8 vni[])
 133{
 134        struct hlist_head *vni_list_head;
 135        struct geneve_dev *geneve;
 136        __u32 hash;
 137
 138        /* Find the device for this VNI */
 139        hash = geneve_net_vni_hash(vni);
 140        vni_list_head = &gs->vni_list[hash];
 141        hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
 142                if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
 143                    ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
 144                        return geneve;
 145        }
 146        return NULL;
 147}
 148#endif
 149
 150static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 151{
 152        return (struct genevehdr *)(udp_hdr(skb) + 1);
 153}
 154
 155/* geneve receive/decap routine */
 156static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb)
 157{
 158        struct genevehdr *gnvh = geneve_hdr(skb);
 159        struct metadata_dst *tun_dst = NULL;
 160        struct geneve_dev *geneve = NULL;
 161        struct pcpu_sw_netstats *stats;
 162        struct iphdr *iph = NULL;
 163        __be32 addr;
 164        static u8 zero_vni[3];
 165        u8 *vni;
 166        int err = 0;
 167        sa_family_t sa_family;
 168#if IS_ENABLED(CONFIG_IPV6)
 169        struct ipv6hdr *ip6h = NULL;
 170        struct in6_addr addr6;
 171        static struct in6_addr zero_addr6;
 172#endif
 173
 174        sa_family = gs->sock->sk->sk_family;
 175
 176        if (sa_family == AF_INET) {
 177                iph = ip_hdr(skb); /* outer IP header... */
 178
 179                if (gs->collect_md) {
 180                        vni = zero_vni;
 181                        addr = 0;
 182                } else {
 183                        vni = gnvh->vni;
 184
 185                        addr = iph->saddr;
 186                }
 187
 188                geneve = geneve_lookup(gs, addr, vni);
 189#if IS_ENABLED(CONFIG_IPV6)
 190        } else if (sa_family == AF_INET6) {
 191                ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 192
 193                if (gs->collect_md) {
 194                        vni = zero_vni;
 195                        addr6 = zero_addr6;
 196                } else {
 197                        vni = gnvh->vni;
 198
 199                        addr6 = ip6h->saddr;
 200                }
 201
 202                geneve = geneve6_lookup(gs, addr6, vni);
 203#endif
 204        }
 205        if (!geneve)
 206                goto drop;
 207
 208        if (ip_tunnel_collect_metadata() || gs->collect_md) {
 209                __be16 flags;
 210
 211                flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
 212                        (gnvh->oam ? TUNNEL_OAM : 0) |
 213                        (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 214
 215                tun_dst = udp_tun_rx_dst(skb, sa_family, flags,
 216                                         vni_to_tunnel_id(gnvh->vni),
 217                                         gnvh->opt_len * 4);
 218                if (!tun_dst)
 219                        goto drop;
 220                /* Update tunnel dst according to Geneve options. */
 221                ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 222                                        gnvh->options, gnvh->opt_len * 4);
 223        } else {
 224                /* Drop packets w/ critical options,
 225                 * since we don't support any...
 226                 */
 227                if (gnvh->critical)
 228                        goto drop;
 229        }
 230
 231        skb_reset_mac_header(skb);
 232        skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev)));
 233        skb->protocol = eth_type_trans(skb, geneve->dev);
 234        skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 235
 236        if (tun_dst)
 237                skb_dst_set(skb, &tun_dst->dst);
 238
 239        /* Ignore packet loops (and multicast echo) */
 240        if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
 241                goto drop;
 242
 243        skb_reset_network_header(skb);
 244
 245        if (iph)
 246                err = IP_ECN_decapsulate(iph, skb);
 247#if IS_ENABLED(CONFIG_IPV6)
 248        if (ip6h)
 249                err = IP6_ECN_decapsulate(ip6h, skb);
 250#endif
 251
 252        if (unlikely(err)) {
 253                if (log_ecn_error) {
 254                        if (iph)
 255                                net_info_ratelimited("non-ECT from %pI4 "
 256                                                     "with TOS=%#x\n",
 257                                                     &iph->saddr, iph->tos);
 258#if IS_ENABLED(CONFIG_IPV6)
 259                        if (ip6h)
 260                                net_info_ratelimited("non-ECT from %pI6\n",
 261                                                     &ip6h->saddr);
 262#endif
 263                }
 264                if (err > 1) {
 265                        ++geneve->dev->stats.rx_frame_errors;
 266                        ++geneve->dev->stats.rx_errors;
 267                        goto drop;
 268                }
 269        }
 270
 271        stats = this_cpu_ptr(geneve->dev->tstats);
 272        u64_stats_update_begin(&stats->syncp);
 273        stats->rx_packets++;
 274        stats->rx_bytes += skb->len;
 275        u64_stats_update_end(&stats->syncp);
 276
 277        gro_cells_receive(&geneve->gro_cells, skb);
 278        return;
 279drop:
 280        /* Consume bad packet */
 281        kfree_skb(skb);
 282}
 283
 284/* Setup stats when device is created */
 285static int geneve_init(struct net_device *dev)
 286{
 287        struct geneve_dev *geneve = netdev_priv(dev);
 288        int err;
 289
 290        dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 291        if (!dev->tstats)
 292                return -ENOMEM;
 293
 294        err = gro_cells_init(&geneve->gro_cells, dev);
 295        if (err) {
 296                free_percpu(dev->tstats);
 297                return err;
 298        }
 299
 300        return 0;
 301}
 302
 303static void geneve_uninit(struct net_device *dev)
 304{
 305        struct geneve_dev *geneve = netdev_priv(dev);
 306
 307        gro_cells_destroy(&geneve->gro_cells);
 308        free_percpu(dev->tstats);
 309}
 310
 311/* Callback from net/ipv4/udp.c to receive packets */
 312static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 313{
 314        struct genevehdr *geneveh;
 315        struct geneve_sock *gs;
 316        int opts_len;
 317
 318        /* Need Geneve and inner Ethernet header to be present */
 319        if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 320                goto error;
 321
 322        /* Return packets with reserved bits set */
 323        geneveh = geneve_hdr(skb);
 324        if (unlikely(geneveh->ver != GENEVE_VER))
 325                goto error;
 326
 327        if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 328                goto error;
 329
 330        opts_len = geneveh->opt_len * 4;
 331        if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 332                                 htons(ETH_P_TEB)))
 333                goto drop;
 334
 335        gs = rcu_dereference_sk_user_data(sk);
 336        if (!gs)
 337                goto drop;
 338
 339        geneve_rx(gs, skb);
 340        return 0;
 341
 342drop:
 343        /* Consume bad packet */
 344        kfree_skb(skb);
 345        return 0;
 346
 347error:
 348        /* Let the UDP layer deal with the skb */
 349        return 1;
 350}
 351
 352static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 353                                         __be16 port, u32 flags)
 354{
 355        struct socket *sock;
 356        struct udp_port_cfg udp_conf;
 357        int err;
 358
 359        memset(&udp_conf, 0, sizeof(udp_conf));
 360
 361        if (ipv6) {
 362                udp_conf.family = AF_INET6;
 363                udp_conf.ipv6_v6only = 1;
 364                udp_conf.use_udp6_rx_checksums =
 365                    !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX);
 366        } else {
 367                udp_conf.family = AF_INET;
 368                udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 369        }
 370
 371        udp_conf.local_udp_port = port;
 372
 373        /* Open UDP socket */
 374        err = udp_sock_create(net, &udp_conf, &sock);
 375        if (err < 0)
 376                return ERR_PTR(err);
 377
 378        return sock;
 379}
 380
 381static void geneve_notify_add_rx_port(struct geneve_sock *gs)
 382{
 383        struct net_device *dev;
 384        struct sock *sk = gs->sock->sk;
 385        struct net *net = sock_net(sk);
 386        sa_family_t sa_family = sk->sk_family;
 387        __be16 port = inet_sk(sk)->inet_sport;
 388        int err;
 389
 390        if (sa_family == AF_INET) {
 391                err = udp_add_offload(sock_net(sk), &gs->udp_offloads);
 392                if (err)
 393                        pr_warn("geneve: udp_add_offload failed with status %d\n",
 394                                err);
 395        }
 396
 397        rcu_read_lock();
 398        for_each_netdev_rcu(net, dev) {
 399                if (dev->netdev_ops->ndo_add_geneve_port)
 400                        dev->netdev_ops->ndo_add_geneve_port(dev, sa_family,
 401                                                             port);
 402        }
 403        rcu_read_unlock();
 404}
 405
 406static int geneve_hlen(struct genevehdr *gh)
 407{
 408        return sizeof(*gh) + gh->opt_len * 4;
 409}
 410
 411static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
 412                                           struct sk_buff *skb,
 413                                           struct udp_offload *uoff)
 414{
 415        struct sk_buff *p, **pp = NULL;
 416        struct genevehdr *gh, *gh2;
 417        unsigned int hlen, gh_len, off_gnv;
 418        const struct packet_offload *ptype;
 419        __be16 type;
 420        int flush = 1;
 421
 422        off_gnv = skb_gro_offset(skb);
 423        hlen = off_gnv + sizeof(*gh);
 424        gh = skb_gro_header_fast(skb, off_gnv);
 425        if (skb_gro_header_hard(skb, hlen)) {
 426                gh = skb_gro_header_slow(skb, hlen, off_gnv);
 427                if (unlikely(!gh))
 428                        goto out;
 429        }
 430
 431        if (gh->ver != GENEVE_VER || gh->oam)
 432                goto out;
 433        gh_len = geneve_hlen(gh);
 434
 435        hlen = off_gnv + gh_len;
 436        if (skb_gro_header_hard(skb, hlen)) {
 437                gh = skb_gro_header_slow(skb, hlen, off_gnv);
 438                if (unlikely(!gh))
 439                        goto out;
 440        }
 441
 442        flush = 0;
 443
 444        for (p = *head; p; p = p->next) {
 445                if (!NAPI_GRO_CB(p)->same_flow)
 446                        continue;
 447
 448                gh2 = (struct genevehdr *)(p->data + off_gnv);
 449                if (gh->opt_len != gh2->opt_len ||
 450                    memcmp(gh, gh2, gh_len)) {
 451                        NAPI_GRO_CB(p)->same_flow = 0;
 452                        continue;
 453                }
 454        }
 455
 456        type = gh->proto_type;
 457
 458        rcu_read_lock();
 459        ptype = gro_find_receive_by_type(type);
 460        if (!ptype) {
 461                flush = 1;
 462                goto out_unlock;
 463        }
 464
 465        skb_gro_pull(skb, gh_len);
 466        skb_gro_postpull_rcsum(skb, gh, gh_len);
 467        pp = ptype->callbacks.gro_receive(head, skb);
 468
 469out_unlock:
 470        rcu_read_unlock();
 471out:
 472        NAPI_GRO_CB(skb)->flush |= flush;
 473
 474        return pp;
 475}
 476
 477static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
 478                               struct udp_offload *uoff)
 479{
 480        struct genevehdr *gh;
 481        struct packet_offload *ptype;
 482        __be16 type;
 483        int gh_len;
 484        int err = -ENOSYS;
 485
 486        udp_tunnel_gro_complete(skb, nhoff);
 487
 488        gh = (struct genevehdr *)(skb->data + nhoff);
 489        gh_len = geneve_hlen(gh);
 490        type = gh->proto_type;
 491
 492        rcu_read_lock();
 493        ptype = gro_find_complete_by_type(type);
 494        if (ptype)
 495                err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 496
 497        rcu_read_unlock();
 498        return err;
 499}
 500
 501/* Create new listen socket if needed */
 502static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 503                                                bool ipv6, u32 flags)
 504{
 505        struct geneve_net *gn = net_generic(net, geneve_net_id);
 506        struct geneve_sock *gs;
 507        struct socket *sock;
 508        struct udp_tunnel_sock_cfg tunnel_cfg;
 509        int h;
 510
 511        gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 512        if (!gs)
 513                return ERR_PTR(-ENOMEM);
 514
 515        sock = geneve_create_sock(net, ipv6, port, flags);
 516        if (IS_ERR(sock)) {
 517                kfree(gs);
 518                return ERR_CAST(sock);
 519        }
 520
 521        gs->sock = sock;
 522        gs->refcnt = 1;
 523        for (h = 0; h < VNI_HASH_SIZE; ++h)
 524                INIT_HLIST_HEAD(&gs->vni_list[h]);
 525
 526        /* Initialize the geneve udp offloads structure */
 527        gs->udp_offloads.port = port;
 528        gs->udp_offloads.callbacks.gro_receive  = geneve_gro_receive;
 529        gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
 530        geneve_notify_add_rx_port(gs);
 531
 532        /* Mark socket as an encapsulation socket */
 533        tunnel_cfg.sk_user_data = gs;
 534        tunnel_cfg.encap_type = 1;
 535        tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 536        tunnel_cfg.encap_destroy = NULL;
 537        setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 538        list_add(&gs->list, &gn->sock_list);
 539        return gs;
 540}
 541
 542static void geneve_notify_del_rx_port(struct geneve_sock *gs)
 543{
 544        struct net_device *dev;
 545        struct sock *sk = gs->sock->sk;
 546        struct net *net = sock_net(sk);
 547        sa_family_t sa_family = sk->sk_family;
 548        __be16 port = inet_sk(sk)->inet_sport;
 549
 550        rcu_read_lock();
 551        for_each_netdev_rcu(net, dev) {
 552                if (dev->netdev_ops->ndo_del_geneve_port)
 553                        dev->netdev_ops->ndo_del_geneve_port(dev, sa_family,
 554                                                             port);
 555        }
 556
 557        rcu_read_unlock();
 558
 559        if (sa_family == AF_INET)
 560                udp_del_offload(&gs->udp_offloads);
 561}
 562
 563static void __geneve_sock_release(struct geneve_sock *gs)
 564{
 565        if (!gs || --gs->refcnt)
 566                return;
 567
 568        list_del(&gs->list);
 569        geneve_notify_del_rx_port(gs);
 570        udp_tunnel_sock_release(gs->sock);
 571        kfree_rcu(gs, rcu);
 572}
 573
 574static void geneve_sock_release(struct geneve_dev *geneve)
 575{
 576        __geneve_sock_release(geneve->sock4);
 577#if IS_ENABLED(CONFIG_IPV6)
 578        __geneve_sock_release(geneve->sock6);
 579#endif
 580}
 581
 582static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 583                                            sa_family_t family,
 584                                            __be16 dst_port)
 585{
 586        struct geneve_sock *gs;
 587
 588        list_for_each_entry(gs, &gn->sock_list, list) {
 589                if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 590                    inet_sk(gs->sock->sk)->sk.sk_family == family) {
 591                        return gs;
 592                }
 593        }
 594        return NULL;
 595}
 596
 597static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 598{
 599        struct net *net = geneve->net;
 600        struct geneve_net *gn = net_generic(net, geneve_net_id);
 601        struct geneve_sock *gs;
 602        __u32 hash;
 603
 604        gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
 605        if (gs) {
 606                gs->refcnt++;
 607                goto out;
 608        }
 609
 610        gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
 611        if (IS_ERR(gs))
 612                return PTR_ERR(gs);
 613
 614out:
 615        gs->collect_md = geneve->collect_md;
 616        gs->flags = geneve->flags;
 617#if IS_ENABLED(CONFIG_IPV6)
 618        if (ipv6)
 619                geneve->sock6 = gs;
 620        else
 621#endif
 622                geneve->sock4 = gs;
 623
 624        hash = geneve_net_vni_hash(geneve->vni);
 625        hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
 626        return 0;
 627}
 628
 629static int geneve_open(struct net_device *dev)
 630{
 631        struct geneve_dev *geneve = netdev_priv(dev);
 632        bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
 633        bool metadata = geneve->collect_md;
 634        int ret = 0;
 635
 636        geneve->sock4 = NULL;
 637#if IS_ENABLED(CONFIG_IPV6)
 638        geneve->sock6 = NULL;
 639        if (ipv6 || metadata)
 640                ret = geneve_sock_add(geneve, true);
 641#endif
 642        if (!ret && (!ipv6 || metadata))
 643                ret = geneve_sock_add(geneve, false);
 644        if (ret < 0)
 645                geneve_sock_release(geneve);
 646
 647        return ret;
 648}
 649
 650static int geneve_stop(struct net_device *dev)
 651{
 652        struct geneve_dev *geneve = netdev_priv(dev);
 653
 654        if (!hlist_unhashed(&geneve->hlist))
 655                hlist_del_rcu(&geneve->hlist);
 656        geneve_sock_release(geneve);
 657        return 0;
 658}
 659
 660static void geneve_build_header(struct genevehdr *geneveh,
 661                                __be16 tun_flags, u8 vni[3],
 662                                u8 options_len, u8 *options)
 663{
 664        geneveh->ver = GENEVE_VER;
 665        geneveh->opt_len = options_len / 4;
 666        geneveh->oam = !!(tun_flags & TUNNEL_OAM);
 667        geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
 668        geneveh->rsvd1 = 0;
 669        memcpy(geneveh->vni, vni, 3);
 670        geneveh->proto_type = htons(ETH_P_TEB);
 671        geneveh->rsvd2 = 0;
 672
 673        memcpy(geneveh->options, options, options_len);
 674}
 675
 676static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
 677                            __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
 678                            u32 flags, bool xnet)
 679{
 680        struct genevehdr *gnvh;
 681        int min_headroom;
 682        int err;
 683        bool udp_sum = !!(flags & GENEVE_F_UDP_CSUM);
 684
 685        skb_scrub_packet(skb, xnet);
 686
 687        min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
 688                        + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
 689        err = skb_cow_head(skb, min_headroom);
 690        if (unlikely(err)) {
 691                kfree_skb(skb);
 692                goto free_rt;
 693        }
 694
 695        skb = udp_tunnel_handle_offloads(skb, udp_sum);
 696        if (IS_ERR(skb)) {
 697                err = PTR_ERR(skb);
 698                goto free_rt;
 699        }
 700
 701        gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
 702        geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
 703
 704        skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 705        return 0;
 706
 707free_rt:
 708        ip_rt_put(rt);
 709        return err;
 710}
 711
 712#if IS_ENABLED(CONFIG_IPV6)
 713static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 714                             __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
 715                             u32 flags, bool xnet)
 716{
 717        struct genevehdr *gnvh;
 718        int min_headroom;
 719        int err;
 720        bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
 721
 722        skb_scrub_packet(skb, xnet);
 723
 724        min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
 725                        + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
 726        err = skb_cow_head(skb, min_headroom);
 727        if (unlikely(err)) {
 728                kfree_skb(skb);
 729                goto free_dst;
 730        }
 731
 732        skb = udp_tunnel_handle_offloads(skb, udp_sum);
 733        if (IS_ERR(skb)) {
 734                err = PTR_ERR(skb);
 735                goto free_dst;
 736        }
 737
 738        gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
 739        geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
 740
 741        skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 742        return 0;
 743
 744free_dst:
 745        dst_release(dst);
 746        return err;
 747}
 748#endif
 749
 750static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 751                                       struct net_device *dev,
 752                                       struct flowi4 *fl4,
 753                                       struct ip_tunnel_info *info)
 754{
 755        struct geneve_dev *geneve = netdev_priv(dev);
 756        struct rtable *rt = NULL;
 757        __u8 tos;
 758
 759        memset(fl4, 0, sizeof(*fl4));
 760        fl4->flowi4_mark = skb->mark;
 761        fl4->flowi4_proto = IPPROTO_UDP;
 762
 763        if (info) {
 764                fl4->daddr = info->key.u.ipv4.dst;
 765                fl4->saddr = info->key.u.ipv4.src;
 766                fl4->flowi4_tos = RT_TOS(info->key.tos);
 767        } else {
 768                tos = geneve->tos;
 769                if (tos == 1) {
 770                        const struct iphdr *iip = ip_hdr(skb);
 771
 772                        tos = ip_tunnel_get_dsfield(iip, skb);
 773                }
 774
 775                fl4->flowi4_tos = RT_TOS(tos);
 776                fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
 777        }
 778
 779        rt = ip_route_output_key(geneve->net, fl4);
 780        if (IS_ERR(rt)) {
 781                netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 782                return ERR_PTR(-ENETUNREACH);
 783        }
 784        if (rt->dst.dev == dev) { /* is this necessary? */
 785                netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 786                ip_rt_put(rt);
 787                return ERR_PTR(-ELOOP);
 788        }
 789        return rt;
 790}
 791
 792#if IS_ENABLED(CONFIG_IPV6)
 793static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 794                                           struct net_device *dev,
 795                                           struct flowi6 *fl6,
 796                                           struct ip_tunnel_info *info)
 797{
 798        struct geneve_dev *geneve = netdev_priv(dev);
 799        struct geneve_sock *gs6 = geneve->sock6;
 800        struct dst_entry *dst = NULL;
 801        __u8 prio;
 802
 803        memset(fl6, 0, sizeof(*fl6));
 804        fl6->flowi6_mark = skb->mark;
 805        fl6->flowi6_proto = IPPROTO_UDP;
 806
 807        if (info) {
 808                fl6->daddr = info->key.u.ipv6.dst;
 809                fl6->saddr = info->key.u.ipv6.src;
 810                fl6->flowi6_tos = RT_TOS(info->key.tos);
 811        } else {
 812                prio = geneve->tos;
 813                if (prio == 1) {
 814                        const struct iphdr *iip = ip_hdr(skb);
 815
 816                        prio = ip_tunnel_get_dsfield(iip, skb);
 817                }
 818
 819                fl6->flowi6_tos = RT_TOS(prio);
 820                fl6->daddr = geneve->remote.sin6.sin6_addr;
 821        }
 822
 823        if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
 824                netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 825                return ERR_PTR(-ENETUNREACH);
 826        }
 827        if (dst->dev == dev) { /* is this necessary? */
 828                netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 829                dst_release(dst);
 830                return ERR_PTR(-ELOOP);
 831        }
 832
 833        return dst;
 834}
 835#endif
 836
 837/* Convert 64 bit tunnel ID to 24 bit VNI. */
 838static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 839{
 840#ifdef __BIG_ENDIAN
 841        vni[0] = (__force __u8)(tun_id >> 16);
 842        vni[1] = (__force __u8)(tun_id >> 8);
 843        vni[2] = (__force __u8)tun_id;
 844#else
 845        vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 846        vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 847        vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 848#endif
 849}
 850
 851static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 852                                   struct ip_tunnel_info *info)
 853{
 854        struct geneve_dev *geneve = netdev_priv(dev);
 855        struct geneve_sock *gs4 = geneve->sock4;
 856        struct rtable *rt = NULL;
 857        const struct iphdr *iip; /* interior IP header */
 858        int err = -EINVAL;
 859        struct flowi4 fl4;
 860        __u8 tos, ttl;
 861        __be16 sport;
 862        __be16 df;
 863        bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 864        u32 flags = geneve->flags;
 865
 866        if (geneve->collect_md) {
 867                if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 868                        netdev_dbg(dev, "no tunnel metadata\n");
 869                        goto tx_error;
 870                }
 871                if (info && ip_tunnel_info_af(info) != AF_INET)
 872                        goto tx_error;
 873        }
 874
 875        rt = geneve_get_v4_rt(skb, dev, &fl4, info);
 876        if (IS_ERR(rt)) {
 877                err = PTR_ERR(rt);
 878                goto tx_error;
 879        }
 880
 881        sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 882        skb_reset_mac_header(skb);
 883
 884        iip = ip_hdr(skb);
 885
 886        if (info) {
 887                const struct ip_tunnel_key *key = &info->key;
 888                u8 *opts = NULL;
 889                u8 vni[3];
 890
 891                tunnel_id_to_vni(key->tun_id, vni);
 892                if (key->tun_flags & TUNNEL_GENEVE_OPT)
 893                        opts = ip_tunnel_info_opts(info);
 894
 895                if (key->tun_flags & TUNNEL_CSUM)
 896                        flags |= GENEVE_F_UDP_CSUM;
 897                else
 898                        flags &= ~GENEVE_F_UDP_CSUM;
 899
 900                err = geneve_build_skb(rt, skb, key->tun_flags, vni,
 901                                       info->options_len, opts, flags, xnet);
 902                if (unlikely(err))
 903                        goto err;
 904
 905                tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
 906                ttl = key->ttl;
 907                df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 908        } else {
 909                err = geneve_build_skb(rt, skb, 0, geneve->vni,
 910                                       0, NULL, flags, xnet);
 911                if (unlikely(err))
 912                        goto err;
 913
 914                tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
 915                ttl = geneve->ttl;
 916                if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
 917                        ttl = 1;
 918                ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 919                df = 0;
 920        }
 921        udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 922                            tos, ttl, df, sport, geneve->dst_port,
 923                            !net_eq(geneve->net, dev_net(geneve->dev)),
 924                            !(flags & GENEVE_F_UDP_CSUM));
 925
 926        return NETDEV_TX_OK;
 927
 928tx_error:
 929        dev_kfree_skb(skb);
 930err:
 931        if (err == -ELOOP)
 932                dev->stats.collisions++;
 933        else if (err == -ENETUNREACH)
 934                dev->stats.tx_carrier_errors++;
 935        else
 936                dev->stats.tx_errors++;
 937        return NETDEV_TX_OK;
 938}
 939
 940#if IS_ENABLED(CONFIG_IPV6)
 941static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 942                                    struct ip_tunnel_info *info)
 943{
 944        struct geneve_dev *geneve = netdev_priv(dev);
 945        struct geneve_sock *gs6 = geneve->sock6;
 946        struct dst_entry *dst = NULL;
 947        const struct iphdr *iip; /* interior IP header */
 948        int err = -EINVAL;
 949        struct flowi6 fl6;
 950        __u8 prio, ttl;
 951        __be16 sport;
 952        bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 953        u32 flags = geneve->flags;
 954
 955        if (geneve->collect_md) {
 956                if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 957                        netdev_dbg(dev, "no tunnel metadata\n");
 958                        goto tx_error;
 959                }
 960        }
 961
 962        dst = geneve_get_v6_dst(skb, dev, &fl6, info);
 963        if (IS_ERR(dst)) {
 964                err = PTR_ERR(dst);
 965                goto tx_error;
 966        }
 967
 968        sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 969        skb_reset_mac_header(skb);
 970
 971        iip = ip_hdr(skb);
 972
 973        if (info) {
 974                const struct ip_tunnel_key *key = &info->key;
 975                u8 *opts = NULL;
 976                u8 vni[3];
 977
 978                tunnel_id_to_vni(key->tun_id, vni);
 979                if (key->tun_flags & TUNNEL_GENEVE_OPT)
 980                        opts = ip_tunnel_info_opts(info);
 981
 982                if (key->tun_flags & TUNNEL_CSUM)
 983                        flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX;
 984                else
 985                        flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
 986
 987                err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
 988                                        info->options_len, opts,
 989                                        flags, xnet);
 990                if (unlikely(err))
 991                        goto err;
 992
 993                prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
 994                ttl = key->ttl;
 995        } else {
 996                err = geneve6_build_skb(dst, skb, 0, geneve->vni,
 997                                        0, NULL, flags, xnet);
 998                if (unlikely(err))
 999                        goto err;
1000
1001                prio = ip_tunnel_ecn_encap(fl6.flowi6_tos, iip, skb);
1002                ttl = geneve->ttl;
1003                if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
1004                        ttl = 1;
1005                ttl = ttl ? : ip6_dst_hoplimit(dst);
1006        }
1007        udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1008                             &fl6.saddr, &fl6.daddr, prio, ttl,
1009                             sport, geneve->dst_port,
1010                             !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX));
1011        return NETDEV_TX_OK;
1012
1013tx_error:
1014        dev_kfree_skb(skb);
1015err:
1016        if (err == -ELOOP)
1017                dev->stats.collisions++;
1018        else if (err == -ENETUNREACH)
1019                dev->stats.tx_carrier_errors++;
1020        else
1021                dev->stats.tx_errors++;
1022        return NETDEV_TX_OK;
1023}
1024#endif
1025
1026static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1027{
1028        struct geneve_dev *geneve = netdev_priv(dev);
1029        struct ip_tunnel_info *info = NULL;
1030
1031        if (geneve->collect_md)
1032                info = skb_tunnel_info(skb);
1033
1034#if IS_ENABLED(CONFIG_IPV6)
1035        if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
1036            (!info && geneve->remote.sa.sa_family == AF_INET6))
1037                return geneve6_xmit_skb(skb, dev, info);
1038#endif
1039        return geneve_xmit_skb(skb, dev, info);
1040}
1041
1042static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
1043{
1044        /* The max_mtu calculation does not take account of GENEVE
1045         * options, to avoid excluding potentially valid
1046         * configurations.
1047         */
1048        int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr)
1049                - dev->hard_header_len;
1050
1051        if (new_mtu < 68)
1052                return -EINVAL;
1053
1054        if (new_mtu > max_mtu) {
1055                if (strict)
1056                        return -EINVAL;
1057
1058                new_mtu = max_mtu;
1059        }
1060
1061        dev->mtu = new_mtu;
1062        return 0;
1063}
1064
1065static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1066{
1067        return __geneve_change_mtu(dev, new_mtu, true);
1068}
1069
1070static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1071{
1072        struct ip_tunnel_info *info = skb_tunnel_info(skb);
1073        struct geneve_dev *geneve = netdev_priv(dev);
1074        struct rtable *rt;
1075        struct flowi4 fl4;
1076#if IS_ENABLED(CONFIG_IPV6)
1077        struct dst_entry *dst;
1078        struct flowi6 fl6;
1079#endif
1080
1081        if (ip_tunnel_info_af(info) == AF_INET) {
1082                rt = geneve_get_v4_rt(skb, dev, &fl4, info);
1083                if (IS_ERR(rt))
1084                        return PTR_ERR(rt);
1085
1086                ip_rt_put(rt);
1087                info->key.u.ipv4.src = fl4.saddr;
1088#if IS_ENABLED(CONFIG_IPV6)
1089        } else if (ip_tunnel_info_af(info) == AF_INET6) {
1090                dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1091                if (IS_ERR(dst))
1092                        return PTR_ERR(dst);
1093
1094                dst_release(dst);
1095                info->key.u.ipv6.src = fl6.saddr;
1096#endif
1097        } else {
1098                return -EINVAL;
1099        }
1100
1101        info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1102                                             1, USHRT_MAX, true);
1103        info->key.tp_dst = geneve->dst_port;
1104        return 0;
1105}
1106
1107static const struct net_device_ops geneve_netdev_ops = {
1108        .ndo_init               = geneve_init,
1109        .ndo_uninit             = geneve_uninit,
1110        .ndo_open               = geneve_open,
1111        .ndo_stop               = geneve_stop,
1112        .ndo_start_xmit         = geneve_xmit,
1113        .ndo_get_stats64        = ip_tunnel_get_stats64,
1114        .ndo_change_mtu         = geneve_change_mtu,
1115        .ndo_validate_addr      = eth_validate_addr,
1116        .ndo_set_mac_address    = eth_mac_addr,
1117        .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1118};
1119
1120static void geneve_get_drvinfo(struct net_device *dev,
1121                               struct ethtool_drvinfo *drvinfo)
1122{
1123        strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1124        strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1125}
1126
1127static const struct ethtool_ops geneve_ethtool_ops = {
1128        .get_drvinfo    = geneve_get_drvinfo,
1129        .get_link       = ethtool_op_get_link,
1130};
1131
1132/* Info for udev, that this is a virtual tunnel endpoint */
1133static struct device_type geneve_type = {
1134        .name = "geneve",
1135};
1136
1137/* Calls the ndo_add_geneve_port of the caller in order to
1138 * supply the listening GENEVE udp ports. Callers are expected
1139 * to implement the ndo_add_geneve_port.
1140 */
1141void geneve_get_rx_port(struct net_device *dev)
1142{
1143        struct net *net = dev_net(dev);
1144        struct geneve_net *gn = net_generic(net, geneve_net_id);
1145        struct geneve_sock *gs;
1146        sa_family_t sa_family;
1147        struct sock *sk;
1148        __be16 port;
1149
1150        rcu_read_lock();
1151        list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1152                sk = gs->sock->sk;
1153                sa_family = sk->sk_family;
1154                port = inet_sk(sk)->inet_sport;
1155                dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port);
1156        }
1157        rcu_read_unlock();
1158}
1159EXPORT_SYMBOL_GPL(geneve_get_rx_port);
1160
1161/* Initialize the device structure. */
1162static void geneve_setup(struct net_device *dev)
1163{
1164        ether_setup(dev);
1165
1166        dev->netdev_ops = &geneve_netdev_ops;
1167        dev->ethtool_ops = &geneve_ethtool_ops;
1168        dev->destructor = free_netdev;
1169
1170        SET_NETDEV_DEVTYPE(dev, &geneve_type);
1171
1172        dev->features    |= NETIF_F_LLTX;
1173        dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1174        dev->features    |= NETIF_F_RXCSUM;
1175        dev->features    |= NETIF_F_GSO_SOFTWARE;
1176
1177        dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1178        dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1179
1180        netif_keep_dst(dev);
1181        dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1182        dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1183        eth_hw_addr_random(dev);
1184}
1185
1186static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1187        [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1188        [IFLA_GENEVE_REMOTE]            = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1189        [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1190        [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1191        [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1192        [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1193        [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1194        [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1195        [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1196        [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1197};
1198
1199static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1200{
1201        if (tb[IFLA_ADDRESS]) {
1202                if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1203                        return -EINVAL;
1204
1205                if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1206                        return -EADDRNOTAVAIL;
1207        }
1208
1209        if (!data)
1210                return -EINVAL;
1211
1212        if (data[IFLA_GENEVE_ID]) {
1213                __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1214
1215                if (vni >= GENEVE_VID_MASK)
1216                        return -ERANGE;
1217        }
1218
1219        return 0;
1220}
1221
1222static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1223                                          __be16 dst_port,
1224                                          union geneve_addr *remote,
1225                                          u8 vni[],
1226                                          bool *tun_on_same_port,
1227                                          bool *tun_collect_md)
1228{
1229        struct geneve_dev *geneve, *t;
1230
1231        *tun_on_same_port = false;
1232        *tun_collect_md = false;
1233        t = NULL;
1234        list_for_each_entry(geneve, &gn->geneve_list, next) {
1235                if (geneve->dst_port == dst_port) {
1236                        *tun_collect_md = geneve->collect_md;
1237                        *tun_on_same_port = true;
1238                }
1239                if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
1240                    !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
1241                    dst_port == geneve->dst_port)
1242                        t = geneve;
1243        }
1244        return t;
1245}
1246
1247static int geneve_configure(struct net *net, struct net_device *dev,
1248                            union geneve_addr *remote,
1249                            __u32 vni, __u8 ttl, __u8 tos, __be16 dst_port,
1250                            bool metadata, u32 flags)
1251{
1252        struct geneve_net *gn = net_generic(net, geneve_net_id);
1253        struct geneve_dev *t, *geneve = netdev_priv(dev);
1254        bool tun_collect_md, tun_on_same_port;
1255        int err, encap_len;
1256
1257        if (!remote)
1258                return -EINVAL;
1259        if (metadata &&
1260            (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl))
1261                return -EINVAL;
1262
1263        geneve->net = net;
1264        geneve->dev = dev;
1265
1266        geneve->vni[0] = (vni & 0x00ff0000) >> 16;
1267        geneve->vni[1] = (vni & 0x0000ff00) >> 8;
1268        geneve->vni[2] =  vni & 0x000000ff;
1269
1270        if ((remote->sa.sa_family == AF_INET &&
1271             IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
1272            (remote->sa.sa_family == AF_INET6 &&
1273             ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
1274                return -EINVAL;
1275        geneve->remote = *remote;
1276
1277        geneve->ttl = ttl;
1278        geneve->tos = tos;
1279        geneve->dst_port = dst_port;
1280        geneve->collect_md = metadata;
1281        geneve->flags = flags;
1282
1283        t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
1284                            &tun_on_same_port, &tun_collect_md);
1285        if (t)
1286                return -EBUSY;
1287
1288        /* make enough headroom for basic scenario */
1289        encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1290        if (remote->sa.sa_family == AF_INET)
1291                encap_len += sizeof(struct iphdr);
1292        else
1293                encap_len += sizeof(struct ipv6hdr);
1294        dev->needed_headroom = encap_len + ETH_HLEN;
1295
1296        if (metadata) {
1297                if (tun_on_same_port)
1298                        return -EPERM;
1299        } else {
1300                if (tun_collect_md)
1301                        return -EPERM;
1302        }
1303
1304        err = register_netdevice(dev);
1305        if (err)
1306                return err;
1307
1308        list_add(&geneve->next, &gn->geneve_list);
1309        return 0;
1310}
1311
1312static int geneve_newlink(struct net *net, struct net_device *dev,
1313                          struct nlattr *tb[], struct nlattr *data[])
1314{
1315        __be16 dst_port = htons(GENEVE_UDP_PORT);
1316        __u8 ttl = 0, tos = 0;
1317        bool metadata = false;
1318        union geneve_addr remote = geneve_remote_unspec;
1319        __u32 vni = 0;
1320        u32 flags = 0;
1321
1322        if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1323                return -EINVAL;
1324
1325        if (data[IFLA_GENEVE_REMOTE]) {
1326                remote.sa.sa_family = AF_INET;
1327                remote.sin.sin_addr.s_addr =
1328                        nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1329        }
1330
1331        if (data[IFLA_GENEVE_REMOTE6]) {
1332                if (!IS_ENABLED(CONFIG_IPV6))
1333                        return -EPFNOSUPPORT;
1334
1335                remote.sa.sa_family = AF_INET6;
1336                remote.sin6.sin6_addr =
1337                        nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1338
1339                if (ipv6_addr_type(&remote.sin6.sin6_addr) &
1340                    IPV6_ADDR_LINKLOCAL) {
1341                        netdev_dbg(dev, "link-local remote is unsupported\n");
1342                        return -EINVAL;
1343                }
1344        }
1345
1346        if (data[IFLA_GENEVE_ID])
1347                vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1348
1349        if (data[IFLA_GENEVE_TTL])
1350                ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1351
1352        if (data[IFLA_GENEVE_TOS])
1353                tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1354
1355        if (data[IFLA_GENEVE_PORT])
1356                dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
1357
1358        if (data[IFLA_GENEVE_COLLECT_METADATA])
1359                metadata = true;
1360
1361        if (data[IFLA_GENEVE_UDP_CSUM] &&
1362            nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1363                flags |= GENEVE_F_UDP_CSUM;
1364
1365        if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1366            nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1367                flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1368
1369        if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1370            nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1371                flags |= GENEVE_F_UDP_ZERO_CSUM6_RX;
1372
1373        return geneve_configure(net, dev, &remote, vni, ttl, tos, dst_port,
1374                                metadata, flags);
1375}
1376
1377static void geneve_dellink(struct net_device *dev, struct list_head *head)
1378{
1379        struct geneve_dev *geneve = netdev_priv(dev);
1380
1381        list_del(&geneve->next);
1382        unregister_netdevice_queue(dev, head);
1383}
1384
1385static size_t geneve_get_size(const struct net_device *dev)
1386{
1387        return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1388                nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1389                nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1390                nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1391                nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1392                nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1393                nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1394                nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1395                nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1396                0;
1397}
1398
1399static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1400{
1401        struct geneve_dev *geneve = netdev_priv(dev);
1402        __u32 vni;
1403
1404        vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
1405        if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1406                goto nla_put_failure;
1407
1408        if (geneve->remote.sa.sa_family == AF_INET) {
1409                if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1410                                    geneve->remote.sin.sin_addr.s_addr))
1411                        goto nla_put_failure;
1412#if IS_ENABLED(CONFIG_IPV6)
1413        } else {
1414                if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1415                                     &geneve->remote.sin6.sin6_addr))
1416                        goto nla_put_failure;
1417#endif
1418        }
1419
1420        if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
1421            nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos))
1422                goto nla_put_failure;
1423
1424        if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
1425                goto nla_put_failure;
1426
1427        if (geneve->collect_md) {
1428                if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1429                        goto nla_put_failure;
1430        }
1431
1432        if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1433                       !!(geneve->flags & GENEVE_F_UDP_CSUM)) ||
1434            nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1435                       !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) ||
1436            nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1437                       !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)))
1438                goto nla_put_failure;
1439
1440        return 0;
1441
1442nla_put_failure:
1443        return -EMSGSIZE;
1444}
1445
1446static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1447        .kind           = "geneve",
1448        .maxtype        = IFLA_GENEVE_MAX,
1449        .policy         = geneve_policy,
1450        .priv_size      = sizeof(struct geneve_dev),
1451        .setup          = geneve_setup,
1452        .validate       = geneve_validate,
1453        .newlink        = geneve_newlink,
1454        .dellink        = geneve_dellink,
1455        .get_size       = geneve_get_size,
1456        .fill_info      = geneve_fill_info,
1457};
1458
1459struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1460                                        u8 name_assign_type, u16 dst_port)
1461{
1462        struct nlattr *tb[IFLA_MAX + 1];
1463        struct net_device *dev;
1464        int err;
1465
1466        memset(tb, 0, sizeof(tb));
1467        dev = rtnl_create_link(net, name, name_assign_type,
1468                               &geneve_link_ops, tb);
1469        if (IS_ERR(dev))
1470                return dev;
1471
1472        err = geneve_configure(net, dev, &geneve_remote_unspec,
1473                               0, 0, 0, htons(dst_port), true,
1474                               GENEVE_F_UDP_ZERO_CSUM6_RX);
1475        if (err)
1476                goto err;
1477
1478        /* openvswitch users expect packet sizes to be unrestricted,
1479         * so set the largest MTU we can.
1480         */
1481        err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
1482        if (err)
1483                goto err;
1484
1485        return dev;
1486
1487 err:
1488        free_netdev(dev);
1489        return ERR_PTR(err);
1490}
1491EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1492
1493static __net_init int geneve_init_net(struct net *net)
1494{
1495        struct geneve_net *gn = net_generic(net, geneve_net_id);
1496
1497        INIT_LIST_HEAD(&gn->geneve_list);
1498        INIT_LIST_HEAD(&gn->sock_list);
1499        return 0;
1500}
1501
1502static void __net_exit geneve_exit_net(struct net *net)
1503{
1504        struct geneve_net *gn = net_generic(net, geneve_net_id);
1505        struct geneve_dev *geneve, *next;
1506        struct net_device *dev, *aux;
1507        LIST_HEAD(list);
1508
1509        rtnl_lock();
1510
1511        /* gather any geneve devices that were moved into this ns */
1512        for_each_netdev_safe(net, dev, aux)
1513                if (dev->rtnl_link_ops == &geneve_link_ops)
1514                        unregister_netdevice_queue(dev, &list);
1515
1516        /* now gather any other geneve devices that were created in this ns */
1517        list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1518                /* If geneve->dev is in the same netns, it was already added
1519                 * to the list by the previous loop.
1520                 */
1521                if (!net_eq(dev_net(geneve->dev), net))
1522                        unregister_netdevice_queue(geneve->dev, &list);
1523        }
1524
1525        /* unregister the devices gathered above */
1526        unregister_netdevice_many(&list);
1527        rtnl_unlock();
1528}
1529
1530static struct pernet_operations geneve_net_ops = {
1531        .init = geneve_init_net,
1532        .exit = geneve_exit_net,
1533        .id   = &geneve_net_id,
1534        .size = sizeof(struct geneve_net),
1535};
1536
1537static int __init geneve_init_module(void)
1538{
1539        int rc;
1540
1541        rc = register_pernet_subsys(&geneve_net_ops);
1542        if (rc)
1543                goto out1;
1544
1545        rc = rtnl_link_register(&geneve_link_ops);
1546        if (rc)
1547                goto out2;
1548
1549        return 0;
1550out2:
1551        unregister_pernet_subsys(&geneve_net_ops);
1552out1:
1553        return rc;
1554}
1555late_initcall(geneve_init_module);
1556
1557static void __exit geneve_cleanup_module(void)
1558{
1559        rtnl_link_unregister(&geneve_link_ops);
1560        unregister_pernet_subsys(&geneve_net_ops);
1561}
1562module_exit(geneve_cleanup_module);
1563
1564MODULE_LICENSE("GPL");
1565MODULE_VERSION(GENEVE_NETDEV_VER);
1566MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1567MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1568MODULE_ALIAS_RTNL_LINK("geneve");
1569