linux/net/sched/act_tunnel_key.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright (c) 2016, Amir Vadai <amir@vadai.me>
   4 * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
   5 */
   6
   7#include <linux/module.h>
   8#include <linux/init.h>
   9#include <linux/kernel.h>
  10#include <linux/skbuff.h>
  11#include <linux/rtnetlink.h>
  12#include <net/geneve.h>
  13#include <net/vxlan.h>
  14#include <net/erspan.h>
  15#include <net/netlink.h>
  16#include <net/pkt_sched.h>
  17#include <net/dst.h>
  18#include <net/pkt_cls.h>
  19
  20#include <linux/tc_act/tc_tunnel_key.h>
  21#include <net/tc_act/tc_tunnel_key.h>
  22
  23static unsigned int tunnel_key_net_id;
  24static struct tc_action_ops act_tunnel_key_ops;
  25
  26static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a,
  27                          struct tcf_result *res)
  28{
  29        struct tcf_tunnel_key *t = to_tunnel_key(a);
  30        struct tcf_tunnel_key_params *params;
  31        int action;
  32
  33        params = rcu_dereference_bh(t->params);
  34
  35        tcf_lastuse_update(&t->tcf_tm);
  36        tcf_action_update_bstats(&t->common, skb);
  37        action = READ_ONCE(t->tcf_action);
  38
  39        switch (params->tcft_action) {
  40        case TCA_TUNNEL_KEY_ACT_RELEASE:
  41                skb_dst_drop(skb);
  42                break;
  43        case TCA_TUNNEL_KEY_ACT_SET:
  44                skb_dst_drop(skb);
  45                skb_dst_set(skb, dst_clone(&params->tcft_enc_metadata->dst));
  46                break;
  47        default:
  48                WARN_ONCE(1, "Bad tunnel_key action %d.\n",
  49                          params->tcft_action);
  50                break;
  51        }
  52
  53        return action;
  54}
  55
  56static const struct nla_policy
  57enc_opts_policy[TCA_TUNNEL_KEY_ENC_OPTS_MAX + 1] = {
  58        [TCA_TUNNEL_KEY_ENC_OPTS_UNSPEC]        = {
  59                .strict_start_type = TCA_TUNNEL_KEY_ENC_OPTS_VXLAN },
  60        [TCA_TUNNEL_KEY_ENC_OPTS_GENEVE]        = { .type = NLA_NESTED },
  61        [TCA_TUNNEL_KEY_ENC_OPTS_VXLAN]         = { .type = NLA_NESTED },
  62        [TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN]        = { .type = NLA_NESTED },
  63};
  64
  65static const struct nla_policy
  66geneve_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1] = {
  67        [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]      = { .type = NLA_U16 },
  68        [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]       = { .type = NLA_U8 },
  69        [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]       = { .type = NLA_BINARY,
  70                                                       .len = 128 },
  71};
  72
  73static const struct nla_policy
  74vxlan_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX + 1] = {
  75        [TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP]         = { .type = NLA_U32 },
  76};
  77
  78static const struct nla_policy
  79erspan_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX + 1] = {
  80        [TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER]        = { .type = NLA_U8 },
  81        [TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX]      = { .type = NLA_U32 },
  82        [TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR]        = { .type = NLA_U8 },
  83        [TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID]       = { .type = NLA_U8 },
  84};
  85
  86static int
  87tunnel_key_copy_geneve_opt(const struct nlattr *nla, void *dst, int dst_len,
  88                           struct netlink_ext_ack *extack)
  89{
  90        struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1];
  91        int err, data_len, opt_len;
  92        u8 *data;
  93
  94        err = nla_parse_nested_deprecated(tb,
  95                                          TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX,
  96                                          nla, geneve_opt_policy, extack);
  97        if (err < 0)
  98                return err;
  99
 100        if (!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] ||
 101            !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] ||
 102            !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]) {
 103                NL_SET_ERR_MSG(extack, "Missing tunnel key geneve option class, type or data");
 104                return -EINVAL;
 105        }
 106
 107        data = nla_data(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
 108        data_len = nla_len(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
 109        if (data_len < 4) {
 110                NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is less than 4 bytes long");
 111                return -ERANGE;
 112        }
 113        if (data_len % 4) {
 114                NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is not a multiple of 4 bytes long");
 115                return -ERANGE;
 116        }
 117
 118        opt_len = sizeof(struct geneve_opt) + data_len;
 119        if (dst) {
 120                struct geneve_opt *opt = dst;
 121
 122                WARN_ON(dst_len < opt_len);
 123
 124                opt->opt_class =
 125                        nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]);
 126                opt->type = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]);
 127                opt->length = data_len / 4; /* length is in units of 4 bytes */
 128                opt->r1 = 0;
 129                opt->r2 = 0;
 130                opt->r3 = 0;
 131
 132                memcpy(opt + 1, data, data_len);
 133        }
 134
 135        return opt_len;
 136}
 137
 138static int
 139tunnel_key_copy_vxlan_opt(const struct nlattr *nla, void *dst, int dst_len,
 140                          struct netlink_ext_ack *extack)
 141{
 142        struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX + 1];
 143        int err;
 144
 145        err = nla_parse_nested(tb, TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX, nla,
 146                               vxlan_opt_policy, extack);
 147        if (err < 0)
 148                return err;
 149
 150        if (!tb[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP]) {
 151                NL_SET_ERR_MSG(extack, "Missing tunnel key vxlan option gbp");
 152                return -EINVAL;
 153        }
 154
 155        if (dst) {
 156                struct vxlan_metadata *md = dst;
 157
 158                md->gbp = nla_get_u32(tb[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP]);
 159                md->gbp &= VXLAN_GBP_MASK;
 160        }
 161
 162        return sizeof(struct vxlan_metadata);
 163}
 164
 165static int
 166tunnel_key_copy_erspan_opt(const struct nlattr *nla, void *dst, int dst_len,
 167                           struct netlink_ext_ack *extack)
 168{
 169        struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX + 1];
 170        int err;
 171        u8 ver;
 172
 173        err = nla_parse_nested(tb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX, nla,
 174                               erspan_opt_policy, extack);
 175        if (err < 0)
 176                return err;
 177
 178        if (!tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER]) {
 179                NL_SET_ERR_MSG(extack, "Missing tunnel key erspan option ver");
 180                return -EINVAL;
 181        }
 182
 183        ver = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER]);
 184        if (ver == 1) {
 185                if (!tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX]) {
 186                        NL_SET_ERR_MSG(extack, "Missing tunnel key erspan option index");
 187                        return -EINVAL;
 188                }
 189        } else if (ver == 2) {
 190                if (!tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR] ||
 191                    !tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID]) {
 192                        NL_SET_ERR_MSG(extack, "Missing tunnel key erspan option dir or hwid");
 193                        return -EINVAL;
 194                }
 195        } else {
 196                NL_SET_ERR_MSG(extack, "Tunnel key erspan option ver is incorrect");
 197                return -EINVAL;
 198        }
 199
 200        if (dst) {
 201                struct erspan_metadata *md = dst;
 202
 203                md->version = ver;
 204                if (ver == 1) {
 205                        nla = tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX];
 206                        md->u.index = nla_get_be32(nla);
 207                } else {
 208                        nla = tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR];
 209                        md->u.md2.dir = nla_get_u8(nla);
 210                        nla = tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID];
 211                        set_hwid(&md->u.md2, nla_get_u8(nla));
 212                }
 213        }
 214
 215        return sizeof(struct erspan_metadata);
 216}
 217
 218static int tunnel_key_copy_opts(const struct nlattr *nla, u8 *dst,
 219                                int dst_len, struct netlink_ext_ack *extack)
 220{
 221        int err, rem, opt_len, len = nla_len(nla), opts_len = 0, type = 0;
 222        const struct nlattr *attr, *head = nla_data(nla);
 223
 224        err = nla_validate_deprecated(head, len, TCA_TUNNEL_KEY_ENC_OPTS_MAX,
 225                                      enc_opts_policy, extack);
 226        if (err)
 227                return err;
 228
 229        nla_for_each_attr(attr, head, len, rem) {
 230                switch (nla_type(attr)) {
 231                case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
 232                        if (type && type != TUNNEL_GENEVE_OPT) {
 233                                NL_SET_ERR_MSG(extack, "Duplicate type for geneve options");
 234                                return -EINVAL;
 235                        }
 236                        opt_len = tunnel_key_copy_geneve_opt(attr, dst,
 237                                                             dst_len, extack);
 238                        if (opt_len < 0)
 239                                return opt_len;
 240                        opts_len += opt_len;
 241                        if (opts_len > IP_TUNNEL_OPTS_MAX) {
 242                                NL_SET_ERR_MSG(extack, "Tunnel options exceeds max size");
 243                                return -EINVAL;
 244                        }
 245                        if (dst) {
 246                                dst_len -= opt_len;
 247                                dst += opt_len;
 248                        }
 249                        type = TUNNEL_GENEVE_OPT;
 250                        break;
 251                case TCA_TUNNEL_KEY_ENC_OPTS_VXLAN:
 252                        if (type) {
 253                                NL_SET_ERR_MSG(extack, "Duplicate type for vxlan options");
 254                                return -EINVAL;
 255                        }
 256                        opt_len = tunnel_key_copy_vxlan_opt(attr, dst,
 257                                                            dst_len, extack);
 258                        if (opt_len < 0)
 259                                return opt_len;
 260                        opts_len += opt_len;
 261                        type = TUNNEL_VXLAN_OPT;
 262                        break;
 263                case TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN:
 264                        if (type) {
 265                                NL_SET_ERR_MSG(extack, "Duplicate type for erspan options");
 266                                return -EINVAL;
 267                        }
 268                        opt_len = tunnel_key_copy_erspan_opt(attr, dst,
 269                                                             dst_len, extack);
 270                        if (opt_len < 0)
 271                                return opt_len;
 272                        opts_len += opt_len;
 273                        type = TUNNEL_ERSPAN_OPT;
 274                        break;
 275                }
 276        }
 277
 278        if (!opts_len) {
 279                NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
 280                return -EINVAL;
 281        }
 282
 283        if (rem > 0) {
 284                NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
 285                return -EINVAL;
 286        }
 287
 288        return opts_len;
 289}
 290
 291static int tunnel_key_get_opts_len(struct nlattr *nla,
 292                                   struct netlink_ext_ack *extack)
 293{
 294        return tunnel_key_copy_opts(nla, NULL, 0, extack);
 295}
 296
 297static int tunnel_key_opts_set(struct nlattr *nla, struct ip_tunnel_info *info,
 298                               int opts_len, struct netlink_ext_ack *extack)
 299{
 300        info->options_len = opts_len;
 301        switch (nla_type(nla_data(nla))) {
 302        case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
 303#if IS_ENABLED(CONFIG_INET)
 304                info->key.tun_flags |= TUNNEL_GENEVE_OPT;
 305                return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
 306                                            opts_len, extack);
 307#else
 308                return -EAFNOSUPPORT;
 309#endif
 310        case TCA_TUNNEL_KEY_ENC_OPTS_VXLAN:
 311#if IS_ENABLED(CONFIG_INET)
 312                info->key.tun_flags |= TUNNEL_VXLAN_OPT;
 313                return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
 314                                            opts_len, extack);
 315#else
 316                return -EAFNOSUPPORT;
 317#endif
 318        case TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN:
 319#if IS_ENABLED(CONFIG_INET)
 320                info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 321                return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
 322                                            opts_len, extack);
 323#else
 324                return -EAFNOSUPPORT;
 325#endif
 326        default:
 327                NL_SET_ERR_MSG(extack, "Cannot set tunnel options for unknown tunnel type");
 328                return -EINVAL;
 329        }
 330}
 331
 332static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
 333        [TCA_TUNNEL_KEY_PARMS]      = { .len = sizeof(struct tc_tunnel_key) },
 334        [TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
 335        [TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
 336        [TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
 337        [TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
 338        [TCA_TUNNEL_KEY_ENC_KEY_ID]   = { .type = NLA_U32 },
 339        [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
 340        [TCA_TUNNEL_KEY_NO_CSUM]      = { .type = NLA_U8 },
 341        [TCA_TUNNEL_KEY_ENC_OPTS]     = { .type = NLA_NESTED },
 342        [TCA_TUNNEL_KEY_ENC_TOS]      = { .type = NLA_U8 },
 343        [TCA_TUNNEL_KEY_ENC_TTL]      = { .type = NLA_U8 },
 344};
 345
 346static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
 347{
 348        if (!p)
 349                return;
 350        if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
 351                dst_release(&p->tcft_enc_metadata->dst);
 352
 353        kfree_rcu(p, rcu);
 354}
 355
 356static int tunnel_key_init(struct net *net, struct nlattr *nla,
 357                           struct nlattr *est, struct tc_action **a,
 358                           int ovr, int bind, bool rtnl_held,
 359                           struct tcf_proto *tp, u32 act_flags,
 360                           struct netlink_ext_ack *extack)
 361{
 362        struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 363        struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
 364        struct tcf_tunnel_key_params *params_new;
 365        struct metadata_dst *metadata = NULL;
 366        struct tcf_chain *goto_ch = NULL;
 367        struct tc_tunnel_key *parm;
 368        struct tcf_tunnel_key *t;
 369        bool exists = false;
 370        __be16 dst_port = 0;
 371        __be64 key_id = 0;
 372        int opts_len = 0;
 373        __be16 flags = 0;
 374        u8 tos, ttl;
 375        int ret = 0;
 376        u32 index;
 377        int err;
 378
 379        if (!nla) {
 380                NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
 381                return -EINVAL;
 382        }
 383
 384        err = nla_parse_nested_deprecated(tb, TCA_TUNNEL_KEY_MAX, nla,
 385                                          tunnel_key_policy, extack);
 386        if (err < 0) {
 387                NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
 388                return err;
 389        }
 390
 391        if (!tb[TCA_TUNNEL_KEY_PARMS]) {
 392                NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
 393                return -EINVAL;
 394        }
 395
 396        parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
 397        index = parm->index;
 398        err = tcf_idr_check_alloc(tn, &index, a, bind);
 399        if (err < 0)
 400                return err;
 401        exists = err;
 402        if (exists && bind)
 403                return 0;
 404
 405        switch (parm->t_action) {
 406        case TCA_TUNNEL_KEY_ACT_RELEASE:
 407                break;
 408        case TCA_TUNNEL_KEY_ACT_SET:
 409                if (tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
 410                        __be32 key32;
 411
 412                        key32 = nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]);
 413                        key_id = key32_to_tunnel_id(key32);
 414                        flags = TUNNEL_KEY;
 415                }
 416
 417                flags |= TUNNEL_CSUM;
 418                if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
 419                    nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
 420                        flags &= ~TUNNEL_CSUM;
 421
 422                if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
 423                        dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
 424
 425                if (tb[TCA_TUNNEL_KEY_ENC_OPTS]) {
 426                        opts_len = tunnel_key_get_opts_len(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 427                                                           extack);
 428                        if (opts_len < 0) {
 429                                ret = opts_len;
 430                                goto err_out;
 431                        }
 432                }
 433
 434                tos = 0;
 435                if (tb[TCA_TUNNEL_KEY_ENC_TOS])
 436                        tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
 437                ttl = 0;
 438                if (tb[TCA_TUNNEL_KEY_ENC_TTL])
 439                        ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);
 440
 441                if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
 442                    tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
 443                        __be32 saddr;
 444                        __be32 daddr;
 445
 446                        saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
 447                        daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
 448
 449                        metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
 450                                                    dst_port, flags,
 451                                                    key_id, opts_len);
 452                } else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
 453                           tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
 454                        struct in6_addr saddr;
 455                        struct in6_addr daddr;
 456
 457                        saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
 458                        daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
 459
 460                        metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
 461                                                      0, flags,
 462                                                      key_id, opts_len);
 463                } else {
 464                        NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
 465                        ret = -EINVAL;
 466                        goto err_out;
 467                }
 468
 469                if (!metadata) {
 470                        NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
 471                        ret = -ENOMEM;
 472                        goto err_out;
 473                }
 474
 475#ifdef CONFIG_DST_CACHE
 476                ret = dst_cache_init(&metadata->u.tun_info.dst_cache, GFP_KERNEL);
 477                if (ret)
 478                        goto release_tun_meta;
 479#endif
 480
 481                if (opts_len) {
 482                        ret = tunnel_key_opts_set(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 483                                                  &metadata->u.tun_info,
 484                                                  opts_len, extack);
 485                        if (ret < 0)
 486                                goto release_tun_meta;
 487                }
 488
 489                metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
 490                break;
 491        default:
 492                NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
 493                ret = -EINVAL;
 494                goto err_out;
 495        }
 496
 497        if (!exists) {
 498                ret = tcf_idr_create_from_flags(tn, index, est, a,
 499                                                &act_tunnel_key_ops, bind,
 500                                                act_flags);
 501                if (ret) {
 502                        NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
 503                        goto release_tun_meta;
 504                }
 505
 506                ret = ACT_P_CREATED;
 507        } else if (!ovr) {
 508                NL_SET_ERR_MSG(extack, "TC IDR already exists");
 509                ret = -EEXIST;
 510                goto release_tun_meta;
 511        }
 512
 513        err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
 514        if (err < 0) {
 515                ret = err;
 516                exists = true;
 517                goto release_tun_meta;
 518        }
 519        t = to_tunnel_key(*a);
 520
 521        params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
 522        if (unlikely(!params_new)) {
 523                NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
 524                ret = -ENOMEM;
 525                exists = true;
 526                goto put_chain;
 527        }
 528        params_new->tcft_action = parm->t_action;
 529        params_new->tcft_enc_metadata = metadata;
 530
 531        spin_lock_bh(&t->tcf_lock);
 532        goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
 533        params_new = rcu_replace_pointer(t->params, params_new,
 534                                         lockdep_is_held(&t->tcf_lock));
 535        spin_unlock_bh(&t->tcf_lock);
 536        tunnel_key_release_params(params_new);
 537        if (goto_ch)
 538                tcf_chain_put_by_act(goto_ch);
 539
 540        return ret;
 541
 542put_chain:
 543        if (goto_ch)
 544                tcf_chain_put_by_act(goto_ch);
 545
 546release_tun_meta:
 547        if (metadata)
 548                dst_release(&metadata->dst);
 549
 550err_out:
 551        if (exists)
 552                tcf_idr_release(*a, bind);
 553        else
 554                tcf_idr_cleanup(tn, index);
 555        return ret;
 556}
 557
 558static void tunnel_key_release(struct tc_action *a)
 559{
 560        struct tcf_tunnel_key *t = to_tunnel_key(a);
 561        struct tcf_tunnel_key_params *params;
 562
 563        params = rcu_dereference_protected(t->params, 1);
 564        tunnel_key_release_params(params);
 565}
 566
 567static int tunnel_key_geneve_opts_dump(struct sk_buff *skb,
 568                                       const struct ip_tunnel_info *info)
 569{
 570        int len = info->options_len;
 571        u8 *src = (u8 *)(info + 1);
 572        struct nlattr *start;
 573
 574        start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_GENEVE);
 575        if (!start)
 576                return -EMSGSIZE;
 577
 578        while (len > 0) {
 579                struct geneve_opt *opt = (struct geneve_opt *)src;
 580
 581                if (nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS,
 582                                 opt->opt_class) ||
 583                    nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE,
 584                               opt->type) ||
 585                    nla_put(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA,
 586                            opt->length * 4, opt + 1)) {
 587                        nla_nest_cancel(skb, start);
 588                        return -EMSGSIZE;
 589                }
 590
 591                len -= sizeof(struct geneve_opt) + opt->length * 4;
 592                src += sizeof(struct geneve_opt) + opt->length * 4;
 593        }
 594
 595        nla_nest_end(skb, start);
 596        return 0;
 597}
 598
 599static int tunnel_key_vxlan_opts_dump(struct sk_buff *skb,
 600                                      const struct ip_tunnel_info *info)
 601{
 602        struct vxlan_metadata *md = (struct vxlan_metadata *)(info + 1);
 603        struct nlattr *start;
 604
 605        start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_VXLAN);
 606        if (!start)
 607                return -EMSGSIZE;
 608
 609        if (nla_put_u32(skb, TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP, md->gbp)) {
 610                nla_nest_cancel(skb, start);
 611                return -EMSGSIZE;
 612        }
 613
 614        nla_nest_end(skb, start);
 615        return 0;
 616}
 617
 618static int tunnel_key_erspan_opts_dump(struct sk_buff *skb,
 619                                       const struct ip_tunnel_info *info)
 620{
 621        struct erspan_metadata *md = (struct erspan_metadata *)(info + 1);
 622        struct nlattr *start;
 623
 624        start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN);
 625        if (!start)
 626                return -EMSGSIZE;
 627
 628        if (nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER, md->version))
 629                goto err;
 630
 631        if (md->version == 1 &&
 632            nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX, md->u.index))
 633                goto err;
 634
 635        if (md->version == 2 &&
 636            (nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR,
 637                        md->u.md2.dir) ||
 638             nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID,
 639                        get_hwid(&md->u.md2))))
 640                goto err;
 641
 642        nla_nest_end(skb, start);
 643        return 0;
 644err:
 645        nla_nest_cancel(skb, start);
 646        return -EMSGSIZE;
 647}
 648
 649static int tunnel_key_opts_dump(struct sk_buff *skb,
 650                                const struct ip_tunnel_info *info)
 651{
 652        struct nlattr *start;
 653        int err = -EINVAL;
 654
 655        if (!info->options_len)
 656                return 0;
 657
 658        start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS);
 659        if (!start)
 660                return -EMSGSIZE;
 661
 662        if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
 663                err = tunnel_key_geneve_opts_dump(skb, info);
 664                if (err)
 665                        goto err_out;
 666        } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
 667                err = tunnel_key_vxlan_opts_dump(skb, info);
 668                if (err)
 669                        goto err_out;
 670        } else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
 671                err = tunnel_key_erspan_opts_dump(skb, info);
 672                if (err)
 673                        goto err_out;
 674        } else {
 675err_out:
 676                nla_nest_cancel(skb, start);
 677                return err;
 678        }
 679
 680        nla_nest_end(skb, start);
 681        return 0;
 682}
 683
 684static int tunnel_key_dump_addresses(struct sk_buff *skb,
 685                                     const struct ip_tunnel_info *info)
 686{
 687        unsigned short family = ip_tunnel_info_af(info);
 688
 689        if (family == AF_INET) {
 690                __be32 saddr = info->key.u.ipv4.src;
 691                __be32 daddr = info->key.u.ipv4.dst;
 692
 693                if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
 694                    !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
 695                        return 0;
 696        }
 697
 698        if (family == AF_INET6) {
 699                const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
 700                const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
 701
 702                if (!nla_put_in6_addr(skb,
 703                                      TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
 704                    !nla_put_in6_addr(skb,
 705                                      TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
 706                        return 0;
 707        }
 708
 709        return -EINVAL;
 710}
 711
 712static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
 713                           int bind, int ref)
 714{
 715        unsigned char *b = skb_tail_pointer(skb);
 716        struct tcf_tunnel_key *t = to_tunnel_key(a);
 717        struct tcf_tunnel_key_params *params;
 718        struct tc_tunnel_key opt = {
 719                .index    = t->tcf_index,
 720                .refcnt   = refcount_read(&t->tcf_refcnt) - ref,
 721                .bindcnt  = atomic_read(&t->tcf_bindcnt) - bind,
 722        };
 723        struct tcf_t tm;
 724
 725        spin_lock_bh(&t->tcf_lock);
 726        params = rcu_dereference_protected(t->params,
 727                                           lockdep_is_held(&t->tcf_lock));
 728        opt.action   = t->tcf_action;
 729        opt.t_action = params->tcft_action;
 730
 731        if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
 732                goto nla_put_failure;
 733
 734        if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
 735                struct ip_tunnel_info *info =
 736                        &params->tcft_enc_metadata->u.tun_info;
 737                struct ip_tunnel_key *key = &info->key;
 738                __be32 key_id = tunnel_id_to_key32(key->tun_id);
 739
 740                if (((key->tun_flags & TUNNEL_KEY) &&
 741                     nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id)) ||
 742                    tunnel_key_dump_addresses(skb,
 743                                              &params->tcft_enc_metadata->u.tun_info) ||
 744                    (key->tp_dst &&
 745                      nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT,
 746                                   key->tp_dst)) ||
 747                    nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
 748                               !(key->tun_flags & TUNNEL_CSUM)) ||
 749                    tunnel_key_opts_dump(skb, info))
 750                        goto nla_put_failure;
 751
 752                if (key->tos && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TOS, key->tos))
 753                        goto nla_put_failure;
 754
 755                if (key->ttl && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TTL, key->ttl))
 756                        goto nla_put_failure;
 757        }
 758
 759        tcf_tm_dump(&tm, &t->tcf_tm);
 760        if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
 761                          &tm, TCA_TUNNEL_KEY_PAD))
 762                goto nla_put_failure;
 763        spin_unlock_bh(&t->tcf_lock);
 764
 765        return skb->len;
 766
 767nla_put_failure:
 768        spin_unlock_bh(&t->tcf_lock);
 769        nlmsg_trim(skb, b);
 770        return -1;
 771}
 772
 773static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
 774                             struct netlink_callback *cb, int type,
 775                             const struct tc_action_ops *ops,
 776                             struct netlink_ext_ack *extack)
 777{
 778        struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 779
 780        return tcf_generic_walker(tn, skb, cb, type, ops, extack);
 781}
 782
 783static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index)
 784{
 785        struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 786
 787        return tcf_idr_search(tn, a, index);
 788}
 789
 790static struct tc_action_ops act_tunnel_key_ops = {
 791        .kind           =       "tunnel_key",
 792        .id             =       TCA_ID_TUNNEL_KEY,
 793        .owner          =       THIS_MODULE,
 794        .act            =       tunnel_key_act,
 795        .dump           =       tunnel_key_dump,
 796        .init           =       tunnel_key_init,
 797        .cleanup        =       tunnel_key_release,
 798        .walk           =       tunnel_key_walker,
 799        .lookup         =       tunnel_key_search,
 800        .size           =       sizeof(struct tcf_tunnel_key),
 801};
 802
 803static __net_init int tunnel_key_init_net(struct net *net)
 804{
 805        struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 806
 807        return tc_action_net_init(net, tn, &act_tunnel_key_ops);
 808}
 809
 810static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
 811{
 812        tc_action_net_exit(net_list, tunnel_key_net_id);
 813}
 814
 815static struct pernet_operations tunnel_key_net_ops = {
 816        .init = tunnel_key_init_net,
 817        .exit_batch = tunnel_key_exit_net,
 818        .id   = &tunnel_key_net_id,
 819        .size = sizeof(struct tc_action_net),
 820};
 821
 822static int __init tunnel_key_init_module(void)
 823{
 824        return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
 825}
 826
 827static void __exit tunnel_key_cleanup_module(void)
 828{
 829        tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
 830}
 831
 832module_init(tunnel_key_init_module);
 833module_exit(tunnel_key_cleanup_module);
 834
 835MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
 836MODULE_DESCRIPTION("ip tunnel manipulation actions");
 837MODULE_LICENSE("GPL v2");
 838