net/openvswitch/flow_netlink.c

   1 /*
   2  * Copyright (c) 2007-2014 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include "flow.h"
  22 #include "datapath.h"
  23 #include <linux/uaccess.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <net/llc_pdu.h>
  29 #include <linux/kernel.h>
  30 #include <linux/jhash.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/llc.h>
  33 #include <linux/module.h>
  34 #include <linux/in.h>
  35 #include <linux/rcupdate.h>
  36 #include <linux/if_arp.h>
  37 #include <linux/ip.h>
  38 #include <linux/ipv6.h>
  39 #include <linux/sctp.h>
  40 #include <linux/tcp.h>
  41 #include <linux/udp.h>
  42 #include <linux/icmp.h>
  43 #include <linux/icmpv6.h>
  44 #include <linux/rculist.h>
  45 #include <net/geneve.h>
  46 #include <net/ip.h>
  47 #include <net/ipv6.h>
  48 #include <net/ndisc.h>
  49 #include <net/mpls.h>
  50 #include <net/vxlan.h>
  51
  52 #include "flow_netlink.h"
  53
  54 struct ovs_len_tbl {
  55         int len;
  56         const struct ovs_len_tbl *next;
  57 };
  58
  59 #define OVS_ATTR_NESTED -1
  60 #define OVS_ATTR_VARIABLE -2
  61
  62 static void update_range(struct sw_flow_match *match,
  63                          size_t offset, size_t size, bool is_mask)
  64 {
  65         struct sw_flow_key_range *range;
  66         size_t start = rounddown(offset, sizeof(long));
  67         size_t end = roundup(offset + size, sizeof(long));
  68
  69         if (!is_mask)
  70                 range = &match->range;
  71         else
  72                 range = &match->mask->range;
  73
  74         if (range->start == range->end) {
  75                 range->start = start;
  76                 range->end = end;
  77                 return;
  78         }
  79
  80         if (range->start > start)
  81                 range->start = start;
  82
  83         if (range->end < end)
  84                 range->end = end;
  85 }
  86
  87 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
  88         do { \
  89                 update_range(match, offsetof(struct sw_flow_key, field),    \
  90                              sizeof((match)->key->field), is_mask);         \
  91                 if (is_mask)                                                \
  92                         (match)->mask->key.field = value;                   \
  93                 else                                                        \
  94                         (match)->key->field = value;                        \
  95         } while (0)
  96
  97 #define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask)     \
  98         do {                                                                \
  99                 update_range(match, offset, len, is_mask);                  \
 100                 if (is_mask)                                                \
 101                         memcpy((u8 *)&(match)->mask->key + offset, value_p, \
 102                                len);                                       \
 103                 else                                                        \
 104                         memcpy((u8 *)(match)->key + offset, value_p, len);  \
 105         } while (0)
 106
 107 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask)               \
 108         SW_FLOW_KEY_MEMCPY_OFFSET(match, offsetof(struct sw_flow_key, field), \
 109                                   value_p, len, is_mask)
 110
 111 #define SW_FLOW_KEY_MEMSET_FIELD(match, field, value, is_mask)              \
 112         do {                                                                \
 113                 update_range(match, offsetof(struct sw_flow_key, field),    \
 114                              sizeof((match)->key->field), is_mask);         \
 115                 if (is_mask)                                                \
 116                         memset((u8 *)&(match)->mask->key.field, value,      \
 117                                sizeof((match)->mask->key.field));           \
 118                 else                                                        \
 119                         memset((u8 *)&(match)->key->field, value,           \
 120                                sizeof((match)->key->field));                \
 121         } while (0)
 122
 123 static bool match_validate(const struct sw_flow_match *match,
 124                            u64 key_attrs, u64 mask_attrs, bool log)
 125 {
 126         u64 key_expected = 1 << OVS_KEY_ATTR_ETHERNET;
 127         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
 128
 129         /* The following mask attributes allowed only if they
 130          * pass the validation tests. */
 131         mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
 132                         | (1 << OVS_KEY_ATTR_IPV6)
 133                         | (1 << OVS_KEY_ATTR_TCP)
 134                         | (1 << OVS_KEY_ATTR_TCP_FLAGS)
 135                         | (1 << OVS_KEY_ATTR_UDP)
 136                         | (1 << OVS_KEY_ATTR_SCTP)
 137                         | (1 << OVS_KEY_ATTR_ICMP)
 138                         | (1 << OVS_KEY_ATTR_ICMPV6)
 139                         | (1 << OVS_KEY_ATTR_ARP)
 140                         | (1 << OVS_KEY_ATTR_ND)
 141                         | (1 << OVS_KEY_ATTR_MPLS));
 142
 143         /* Always allowed mask fields. */
 144         mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL)
 145                        | (1 << OVS_KEY_ATTR_IN_PORT)
 146                        | (1 << OVS_KEY_ATTR_ETHERTYPE));
 147
 148         /* Check key attributes. */
 149         if (match->key->eth.type == htons(ETH_P_ARP)
 150                         || match->key->eth.type == htons(ETH_P_RARP)) {
 151                 key_expected |= 1 << OVS_KEY_ATTR_ARP;
 152                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 153                         mask_allowed |= 1 << OVS_KEY_ATTR_ARP;
 154         }
 155
 156         if (eth_p_mpls(match->key->eth.type)) {
 157                 key_expected |= 1 << OVS_KEY_ATTR_MPLS;
 158                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 159                         mask_allowed |= 1 << OVS_KEY_ATTR_MPLS;
 160         }
 161
 162         if (match->key->eth.type == htons(ETH_P_IP)) {
 163                 key_expected |= 1 << OVS_KEY_ATTR_IPV4;
 164                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 165                         mask_allowed |= 1 << OVS_KEY_ATTR_IPV4;
 166
 167                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 168                         if (match->key->ip.proto == IPPROTO_UDP) {
 169                                 key_expected |= 1 << OVS_KEY_ATTR_UDP;
 170                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 171                                         mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
 172                         }
 173
 174                         if (match->key->ip.proto == IPPROTO_SCTP) {
 175                                 key_expected |= 1 << OVS_KEY_ATTR_SCTP;
 176                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 177                                         mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
 178                         }
 179
 180                         if (match->key->ip.proto == IPPROTO_TCP) {
 181                                 key_expected |= 1 << OVS_KEY_ATTR_TCP;
 182                                 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 183                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 184                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
 185                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 186                                 }
 187                         }
 188
 189                         if (match->key->ip.proto == IPPROTO_ICMP) {
 190                                 key_expected |= 1 << OVS_KEY_ATTR_ICMP;
 191                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 192                                         mask_allowed |= 1 << OVS_KEY_ATTR_ICMP;
 193                         }
 194                 }
 195         }
 196
 197         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 198                 key_expected |= 1 << OVS_KEY_ATTR_IPV6;
 199                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 200                         mask_allowed |= 1 << OVS_KEY_ATTR_IPV6;
 201
 202                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 203                         if (match->key->ip.proto == IPPROTO_UDP) {
 204                                 key_expected |= 1 << OVS_KEY_ATTR_UDP;
 205                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 206                                         mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
 207                         }
 208
 209                         if (match->key->ip.proto == IPPROTO_SCTP) {
 210                                 key_expected |= 1 << OVS_KEY_ATTR_SCTP;
 211                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 212                                         mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
 213                         }
 214
 215                         if (match->key->ip.proto == IPPROTO_TCP) {
 216                                 key_expected |= 1 << OVS_KEY_ATTR_TCP;
 217                                 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 218                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 219                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
 220                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 221                                 }
 222                         }
 223
 224                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 225                                 key_expected |= 1 << OVS_KEY_ATTR_ICMPV6;
 226                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 227                                         mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6;
 228
 229                                 if (match->key->tp.src ==
 230                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 231                                     match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 232                                         key_expected |= 1 << OVS_KEY_ATTR_ND;
 233                                         if (match->mask && (match->mask->key.tp.src == htons(0xff)))
 234                                                 mask_allowed |= 1 << OVS_KEY_ATTR_ND;
 235                                 }
 236                         }
 237                 }
 238         }
 239
 240         if ((key_attrs & key_expected) != key_expected) {
 241                 /* Key attributes check failed. */
 242                 OVS_NLERR(log, "Missing key (keys=%llx, expected=%llx)",
 243                           (unsigned long long)key_attrs,
 244                           (unsigned long long)key_expected);
 245                 return false;
 246         }
 247
 248         if ((mask_attrs & mask_allowed) != mask_attrs) {
 249                 /* Mask attributes check failed. */
 250                 OVS_NLERR(log, "Unexpected mask (mask=%llx, allowed=%llx)",
 251                           (unsigned long long)mask_attrs,
 252                           (unsigned long long)mask_allowed);
 253                 return false;
 254         }
 255
 256         return true;
 257 }
 258
 259 size_t ovs_tun_key_attr_size(void)
 260 {
 261         /* Whenever adding new OVS_TUNNEL_KEY_ FIELDS, we should consider
 262          * updating this function.
 263          */
 264         return    nla_total_size(8)    /* OVS_TUNNEL_KEY_ATTR_ID */
 265                 + nla_total_size(4)    /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
 266                 + nla_total_size(4)    /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
 267                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TOS */
 268                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TTL */
 269                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 270                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_CSUM */
 271                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_OAM */
 272                 + nla_total_size(256)  /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
 273                 /* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS is mutually exclusive with
 274                  * OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it.
 275                  */
 276                 + nla_total_size(2)    /* OVS_TUNNEL_KEY_ATTR_TP_SRC */
 277                 + nla_total_size(2);   /* OVS_TUNNEL_KEY_ATTR_TP_DST */
 278 }
 279
 280 size_t ovs_key_attr_size(void)
 281 {
 282         /* Whenever adding new OVS_KEY_ FIELDS, we should consider
 283          * updating this function.
 284          */
 285         BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 26);
 286
 287         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 288                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 289                   + ovs_tun_key_attr_size()
 290                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 291                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 292                 + nla_total_size(4)   /* OVS_KEY_ATTR_DP_HASH */
 293                 + nla_total_size(4)   /* OVS_KEY_ATTR_RECIRC_ID */
 294                 + nla_total_size(4)   /* OVS_KEY_ATTR_CT_STATE */
 295                 + nla_total_size(2)   /* OVS_KEY_ATTR_CT_ZONE */
 296                 + nla_total_size(4)   /* OVS_KEY_ATTR_CT_MARK */
 297                 + nla_total_size(16)  /* OVS_KEY_ATTR_CT_LABELS */
 298                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 299                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 300                 + nla_total_size(4)   /* OVS_KEY_ATTR_VLAN */
 301                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 302                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 303                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 304                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 305                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
 306 }
 307
 308 static const struct ovs_len_tbl ovs_vxlan_ext_key_lens[OVS_VXLAN_EXT_MAX + 1] = {
 309         [OVS_VXLAN_EXT_GBP]         = { .len = sizeof(u32) },
 310 };
 311
 312 static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
 313         [OVS_TUNNEL_KEY_ATTR_ID]            = { .len = sizeof(u64) },
 314         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC]      = { .len = sizeof(u32) },
 315         [OVS_TUNNEL_KEY_ATTR_IPV4_DST]      = { .len = sizeof(u32) },
 316         [OVS_TUNNEL_KEY_ATTR_TOS]           = { .len = 1 },
 317         [OVS_TUNNEL_KEY_ATTR_TTL]           = { .len = 1 },
 318         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = { .len = 0 },
 319         [OVS_TUNNEL_KEY_ATTR_CSUM]          = { .len = 0 },
 320         [OVS_TUNNEL_KEY_ATTR_TP_SRC]        = { .len = sizeof(u16) },
 321         [OVS_TUNNEL_KEY_ATTR_TP_DST]        = { .len = sizeof(u16) },
 322         [OVS_TUNNEL_KEY_ATTR_OAM]           = { .len = 0 },
 323         [OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS]   = { .len = OVS_ATTR_VARIABLE },
 324         [OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS]    = { .len = OVS_ATTR_NESTED,
 325                                                 .next = ovs_vxlan_ext_key_lens },
 326 };
 327
 328 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 329 static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 330         [OVS_KEY_ATTR_ENCAP]     = { .len = OVS_ATTR_NESTED },
 331         [OVS_KEY_ATTR_PRIORITY]  = { .len = sizeof(u32) },
 332         [OVS_KEY_ATTR_IN_PORT]   = { .len = sizeof(u32) },
 333         [OVS_KEY_ATTR_SKB_MARK]  = { .len = sizeof(u32) },
 334         [OVS_KEY_ATTR_ETHERNET]  = { .len = sizeof(struct ovs_key_ethernet) },
 335         [OVS_KEY_ATTR_VLAN]      = { .len = sizeof(__be16) },
 336         [OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) },
 337         [OVS_KEY_ATTR_IPV4]      = { .len = sizeof(struct ovs_key_ipv4) },
 338         [OVS_KEY_ATTR_IPV6]      = { .len = sizeof(struct ovs_key_ipv6) },
 339         [OVS_KEY_ATTR_TCP]       = { .len = sizeof(struct ovs_key_tcp) },
 340         [OVS_KEY_ATTR_TCP_FLAGS] = { .len = sizeof(__be16) },
 341         [OVS_KEY_ATTR_UDP]       = { .len = sizeof(struct ovs_key_udp) },
 342         [OVS_KEY_ATTR_SCTP]      = { .len = sizeof(struct ovs_key_sctp) },
 343         [OVS_KEY_ATTR_ICMP]      = { .len = sizeof(struct ovs_key_icmp) },
 344         [OVS_KEY_ATTR_ICMPV6]    = { .len = sizeof(struct ovs_key_icmpv6) },
 345         [OVS_KEY_ATTR_ARP]       = { .len = sizeof(struct ovs_key_arp) },
 346         [OVS_KEY_ATTR_ND]        = { .len = sizeof(struct ovs_key_nd) },
 347         [OVS_KEY_ATTR_RECIRC_ID] = { .len = sizeof(u32) },
 348         [OVS_KEY_ATTR_DP_HASH]   = { .len = sizeof(u32) },
 349         [OVS_KEY_ATTR_TUNNEL]    = { .len = OVS_ATTR_NESTED,
 350                                      .next = ovs_tunnel_key_lens, },
 351         [OVS_KEY_ATTR_MPLS]      = { .len = sizeof(struct ovs_key_mpls) },
 352         [OVS_KEY_ATTR_CT_STATE]  = { .len = sizeof(u32) },
 353         [OVS_KEY_ATTR_CT_ZONE]   = { .len = sizeof(u16) },
 354         [OVS_KEY_ATTR_CT_MARK]   = { .len = sizeof(u32) },
 355         [OVS_KEY_ATTR_CT_LABELS] = { .len = sizeof(struct ovs_key_ct_labels) },
 356 };
 357
 358 static bool check_attr_len(unsigned int attr_len, unsigned int expected_len)
 359 {
 360         return expected_len == attr_len ||
 361                expected_len == OVS_ATTR_NESTED ||
 362                expected_len == OVS_ATTR_VARIABLE;
 363 }
 364
 365 static bool is_all_zero(const u8 *fp, size_t size)
 366 {
 367         int i;
 368
 369         if (!fp)
 370                 return false;
 371
 372         for (i = 0; i < size; i++)
 373                 if (fp[i])
 374                         return false;
 375
 376         return true;
 377 }
 378
 379 static int __parse_flow_nlattrs(const struct nlattr *attr,
 380                                 const struct nlattr *a[],
 381                                 u64 *attrsp, bool log, bool nz)
 382 {
 383         const struct nlattr *nla;
 384         u64 attrs;
 385         int rem;
 386
 387         attrs = *attrsp;
 388         nla_for_each_nested(nla, attr, rem) {
 389                 u16 type = nla_type(nla);
 390                 int expected_len;
 391
 392                 if (type > OVS_KEY_ATTR_MAX) {
 393                         OVS_NLERR(log, "Key type %d is out of range max %d",
 394                                   type, OVS_KEY_ATTR_MAX);
 395                         return -EINVAL;
 396                 }
 397
 398                 if (attrs & (1 << type)) {
 399                         OVS_NLERR(log, "Duplicate key (type %d).", type);
 400                         return -EINVAL;
 401                 }
 402
 403                 expected_len = ovs_key_lens[type].len;
 404                 if (!check_attr_len(nla_len(nla), expected_len)) {
 405                         OVS_NLERR(log, "Key %d has unexpected len %d expected %d",
 406                                   type, nla_len(nla), expected_len);
 407                         return -EINVAL;
 408                 }
 409
 410                 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
 411                         attrs |= 1 << type;
 412                         a[type] = nla;
 413                 }
 414         }
 415         if (rem) {
 416                 OVS_NLERR(log, "Message has %d unknown bytes.", rem);
 417                 return -EINVAL;
 418         }
 419
 420         *attrsp = attrs;
 421         return 0;
 422 }
 423
 424 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 425                                    const struct nlattr *a[], u64 *attrsp,
 426                                    bool log)
 427 {
 428         return __parse_flow_nlattrs(attr, a, attrsp, log, true);
 429 }
 430
 431 static int parse_flow_nlattrs(const struct nlattr *attr,
 432                               const struct nlattr *a[], u64 *attrsp,
 433                               bool log)
 434 {
 435         return __parse_flow_nlattrs(attr, a, attrsp, log, false);
 436 }
 437
 438 static int genev_tun_opt_from_nlattr(const struct nlattr *a,
 439                                      struct sw_flow_match *match, bool is_mask,
 440                                      bool log)
 441 {
 442         unsigned long opt_key_offset;
 443
 444         if (nla_len(a) > sizeof(match->key->tun_opts)) {
 445                 OVS_NLERR(log, "Geneve option length err (len %d, max %zu).",
 446                           nla_len(a), sizeof(match->key->tun_opts));
 447                 return -EINVAL;
 448         }
 449
 450         if (nla_len(a) % 4 != 0) {
 451                 OVS_NLERR(log, "Geneve opt len %d is not a multiple of 4.",
 452                           nla_len(a));
 453                 return -EINVAL;
 454         }
 455
 456         /* We need to record the length of the options passed
 457          * down, otherwise packets with the same format but
 458          * additional options will be silently matched.
 459          */
 460         if (!is_mask) {
 461                 SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a),
 462                                 false);
 463         } else {
 464                 /* This is somewhat unusual because it looks at
 465                  * both the key and mask while parsing the
 466                  * attributes (and by extension assumes the key
 467                  * is parsed first). Normally, we would verify
 468                  * that each is the correct length and that the
 469                  * attributes line up in the validate function.
 470                  * However, that is difficult because this is
 471                  * variable length and we won't have the
 472                  * information later.
 473                  */
 474                 if (match->key->tun_opts_len != nla_len(a)) {
 475                         OVS_NLERR(log, "Geneve option len %d != mask len %d",
 476                                   match->key->tun_opts_len, nla_len(a));
 477                         return -EINVAL;
 478                 }
 479
 480                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 481         }
 482
 483         opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
 484         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
 485                                   nla_len(a), is_mask);
 486         return 0;
 487 }
 488
 489 static int vxlan_tun_opt_from_nlattr(const struct nlattr *attr,
 490                                      struct sw_flow_match *match, bool is_mask,
 491                                      bool log)
 492 {
 493         struct nlattr *a;
 494         int rem;
 495         unsigned long opt_key_offset;
 496         struct vxlan_metadata opts;
 497
 498         BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts));
 499
 500         memset(&opts, 0, sizeof(opts));
 501         nla_for_each_nested(a, attr, rem) {
 502                 int type = nla_type(a);
 503
 504                 if (type > OVS_VXLAN_EXT_MAX) {
 505                         OVS_NLERR(log, "VXLAN extension %d out of range max %d",
 506                                   type, OVS_VXLAN_EXT_MAX);
 507                         return -EINVAL;
 508                 }
 509
 510                 if (!check_attr_len(nla_len(a),
 511                                     ovs_vxlan_ext_key_lens[type].len)) {
 512                         OVS_NLERR(log, "VXLAN extension %d has unexpected len %d expected %d",
 513                                   type, nla_len(a),
 514                                   ovs_vxlan_ext_key_lens[type].len);
 515                         return -EINVAL;
 516                 }
 517
 518                 switch (type) {
 519                 case OVS_VXLAN_EXT_GBP:
 520                         opts.gbp = nla_get_u32(a);
 521                         break;
 522                 default:
 523                         OVS_NLERR(log, "Unknown VXLAN extension attribute %d",
 524                                   type);
 525                         return -EINVAL;
 526                 }
 527         }
 528         if (rem) {
 529                 OVS_NLERR(log, "VXLAN extension message has %d unknown bytes.",
 530                           rem);
 531                 return -EINVAL;
 532         }
 533
 534         if (!is_mask)
 535                 SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), false);
 536         else
 537                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 538
 539         opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts));
 540         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts),
 541                                   is_mask);
 542         return 0;
 543 }
 544
 545 static int ipv4_tun_from_nlattr(const struct nlattr *attr,
 546                                 struct sw_flow_match *match, bool is_mask,
 547                                 bool log)
 548 {
 549         struct nlattr *a;
 550         int rem;
 551         bool ttl = false;
 552         __be16 tun_flags = 0;
 553         int opts_type = 0;
 554
 555         nla_for_each_nested(a, attr, rem) {
 556                 int type = nla_type(a);
 557                 int err;
 558
 559                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
 560                         OVS_NLERR(log, "Tunnel attr %d out of range max %d",
 561                                   type, OVS_TUNNEL_KEY_ATTR_MAX);
 562                         return -EINVAL;
 563                 }
 564
 565                 if (!check_attr_len(nla_len(a),
 566                                     ovs_tunnel_key_lens[type].len)) {
 567                         OVS_NLERR(log, "Tunnel attr %d has unexpected len %d expected %d",
 568                                   type, nla_len(a), ovs_tunnel_key_lens[type].len);
 569                         return -EINVAL;
 570                 }
 571
 572                 switch (type) {
 573                 case OVS_TUNNEL_KEY_ATTR_ID:
 574                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
 575                                         nla_get_be64(a), is_mask);
 576                         tun_flags |= TUNNEL_KEY;
 577                         break;
 578                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
 579                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.src,
 580                                         nla_get_in_addr(a), is_mask);
 581                         break;
 582                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
 583                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.dst,
 584                                         nla_get_in_addr(a), is_mask);
 585                         break;
 586                 case OVS_TUNNEL_KEY_ATTR_TOS:
 587                         SW_FLOW_KEY_PUT(match, tun_key.tos,
 588                                         nla_get_u8(a), is_mask);
 589                         break;
 590                 case OVS_TUNNEL_KEY_ATTR_TTL:
 591                         SW_FLOW_KEY_PUT(match, tun_key.ttl,
 592                                         nla_get_u8(a), is_mask);
 593                         ttl = true;
 594                         break;
 595                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
 596                         tun_flags |= TUNNEL_DONT_FRAGMENT;
 597                         break;
 598                 case OVS_TUNNEL_KEY_ATTR_CSUM:
 599                         tun_flags |= TUNNEL_CSUM;
 600                         break;
 601                 case OVS_TUNNEL_KEY_ATTR_TP_SRC:
 602                         SW_FLOW_KEY_PUT(match, tun_key.tp_src,
 603                                         nla_get_be16(a), is_mask);
 604                         break;
 605                 case OVS_TUNNEL_KEY_ATTR_TP_DST:
 606                         SW_FLOW_KEY_PUT(match, tun_key.tp_dst,
 607                                         nla_get_be16(a), is_mask);
 608                         break;
 609                 case OVS_TUNNEL_KEY_ATTR_OAM:
 610                         tun_flags |= TUNNEL_OAM;
 611                         break;
 612                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
 613                         if (opts_type) {
 614                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 615                                 return -EINVAL;
 616                         }
 617
 618                         err = genev_tun_opt_from_nlattr(a, match, is_mask, log);
 619                         if (err)
 620                                 return err;
 621
 622                         tun_flags |= TUNNEL_GENEVE_OPT;
 623                         opts_type = type;
 624                         break;
 625                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
 626                         if (opts_type) {
 627                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 628                                 return -EINVAL;
 629                         }
 630
 631                         err = vxlan_tun_opt_from_nlattr(a, match, is_mask, log);
 632                         if (err)
 633                                 return err;
 634
 635                         tun_flags |= TUNNEL_VXLAN_OPT;
 636                         opts_type = type;
 637                         break;
 638                 default:
 639                         OVS_NLERR(log, "Unknown IPv4 tunnel attribute %d",
 640                                   type);
 641                         return -EINVAL;
 642                 }
 643         }
 644
 645         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
 646
 647         if (rem > 0) {
 648                 OVS_NLERR(log, "IPv4 tunnel attribute has %d unknown bytes.",
 649                           rem);
 650                 return -EINVAL;
 651         }
 652
 653         if (!is_mask) {
 654                 if (!match->key->tun_key.u.ipv4.dst) {
 655                         OVS_NLERR(log, "IPv4 tunnel dst address is zero");
 656                         return -EINVAL;
 657                 }
 658
 659                 if (!ttl) {
 660                         OVS_NLERR(log, "IPv4 tunnel TTL not specified.");
 661                         return -EINVAL;
 662                 }
 663         }
 664
 665         return opts_type;
 666 }
 667
 668 static int vxlan_opt_to_nlattr(struct sk_buff *skb,
 669                                const void *tun_opts, int swkey_tun_opts_len)
 670 {
 671         const struct vxlan_metadata *opts = tun_opts;
 672         struct nlattr *nla;
 673
 674         nla = nla_nest_start(skb, OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS);
 675         if (!nla)
 676                 return -EMSGSIZE;
 677
 678         if (nla_put_u32(skb, OVS_VXLAN_EXT_GBP, opts->gbp) < 0)
 679                 return -EMSGSIZE;
 680
 681         nla_nest_end(skb, nla);
 682         return 0;
 683 }
 684
 685 static int __ipv4_tun_to_nlattr(struct sk_buff *skb,
 686                                 const struct ip_tunnel_key *output,
 687                                 const void *tun_opts, int swkey_tun_opts_len)
 688 {
 689         if (output->tun_flags & TUNNEL_KEY &&
 690             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
 691                 return -EMSGSIZE;
 692         if (output->u.ipv4.src &&
 693             nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC,
 694                             output->u.ipv4.src))
 695                 return -EMSGSIZE;
 696         if (output->u.ipv4.dst &&
 697             nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST,
 698                             output->u.ipv4.dst))
 699                 return -EMSGSIZE;
 700         if (output->tos &&
 701             nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->tos))
 702                 return -EMSGSIZE;
 703         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ttl))
 704                 return -EMSGSIZE;
 705         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
 706             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
 707                 return -EMSGSIZE;
 708         if ((output->tun_flags & TUNNEL_CSUM) &&
 709             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
 710                 return -EMSGSIZE;
 711         if (output->tp_src &&
 712             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_SRC, output->tp_src))
 713                 return -EMSGSIZE;
 714         if (output->tp_dst &&
 715             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_DST, output->tp_dst))
 716                 return -EMSGSIZE;
 717         if ((output->tun_flags & TUNNEL_OAM) &&
 718             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
 719                 return -EMSGSIZE;
 720         if (tun_opts) {
 721                 if (output->tun_flags & TUNNEL_GENEVE_OPT &&
 722                     nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,
 723                             swkey_tun_opts_len, tun_opts))
 724                         return -EMSGSIZE;
 725                 else if (output->tun_flags & TUNNEL_VXLAN_OPT &&
 726                          vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len))
 727                         return -EMSGSIZE;
 728         }
 729
 730         return 0;
 731 }
 732
 733 static int ipv4_tun_to_nlattr(struct sk_buff *skb,
 734                               const struct ip_tunnel_key *output,
 735                               const void *tun_opts, int swkey_tun_opts_len)
 736 {
 737         struct nlattr *nla;
 738         int err;
 739
 740         nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
 741         if (!nla)
 742                 return -EMSGSIZE;
 743
 744         err = __ipv4_tun_to_nlattr(skb, output, tun_opts, swkey_tun_opts_len);
 745         if (err)
 746                 return err;
 747
 748         nla_nest_end(skb, nla);
 749         return 0;
 750 }
 751
 752 int ovs_nla_put_egress_tunnel_key(struct sk_buff *skb,
 753                                   const struct ip_tunnel_info *egress_tun_info,
 754                                   const void *egress_tun_opts)
 755 {
 756         return __ipv4_tun_to_nlattr(skb, &egress_tun_info->key,
 757                                     egress_tun_opts,
 758                                     egress_tun_info->options_len);
 759 }
 760
 761 static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
 762                                  u64 *attrs, const struct nlattr **a,
 763                                  bool is_mask, bool log)
 764 {
 765         if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) {
 766                 u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
 767
 768                 SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
 769                 *attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH);
 770         }
 771
 772         if (*attrs & (1 << OVS_KEY_ATTR_RECIRC_ID)) {
 773                 u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
 774
 775                 SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
 776                 *attrs &= ~(1 << OVS_KEY_ATTR_RECIRC_ID);
 777         }
 778
 779         if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
 780                 SW_FLOW_KEY_PUT(match, phy.priority,
 781                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
 782                 *attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
 783         }
 784
 785         if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
 786                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
 787
 788                 if (is_mask) {
 789                         in_port = 0xffffffff; /* Always exact match in_port. */
 790                 } else if (in_port >= DP_MAX_PORTS) {
 791                         OVS_NLERR(log, "Port %d exceeds max allowable %d",
 792                                   in_port, DP_MAX_PORTS);
 793                         return -EINVAL;
 794                 }
 795
 796                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
 797                 *attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
 798         } else if (!is_mask) {
 799                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
 800         }
 801
 802         if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) {
 803                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
 804
 805                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
 806                 *attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK);
 807         }
 808         if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) {
 809                 if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
 810                                          is_mask, log) < 0)
 811                         return -EINVAL;
 812                 *attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL);
 813         }
 814
 815         if (*attrs & (1 << OVS_KEY_ATTR_CT_STATE) &&
 816             ovs_ct_verify(net, OVS_KEY_ATTR_CT_STATE)) {
 817                 u32 ct_state = nla_get_u32(a[OVS_KEY_ATTR_CT_STATE]);
 818
 819                 if (!is_mask && !ovs_ct_state_supported(ct_state)) {
 820                         OVS_NLERR(log, "ct_state flags %08x unsupported",
 821                                   ct_state);
 822                         return -EINVAL;
 823                 }
 824
 825                 SW_FLOW_KEY_PUT(match, ct.state, ct_state, is_mask);
 826                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_STATE);
 827         }
 828         if (*attrs & (1 << OVS_KEY_ATTR_CT_ZONE) &&
 829             ovs_ct_verify(net, OVS_KEY_ATTR_CT_ZONE)) {
 830                 u16 ct_zone = nla_get_u16(a[OVS_KEY_ATTR_CT_ZONE]);
 831
 832                 SW_FLOW_KEY_PUT(match, ct.zone, ct_zone, is_mask);
 833                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ZONE);
 834         }
 835         if (*attrs & (1 << OVS_KEY_ATTR_CT_MARK) &&
 836             ovs_ct_verify(net, OVS_KEY_ATTR_CT_MARK)) {
 837                 u32 mark = nla_get_u32(a[OVS_KEY_ATTR_CT_MARK]);
 838
 839                 SW_FLOW_KEY_PUT(match, ct.mark, mark, is_mask);
 840                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_MARK);
 841         }
 842         if (*attrs & (1 << OVS_KEY_ATTR_CT_LABELS) &&
 843             ovs_ct_verify(net, OVS_KEY_ATTR_CT_LABELS)) {
 844                 const struct ovs_key_ct_labels *cl;
 845
 846                 cl = nla_data(a[OVS_KEY_ATTR_CT_LABELS]);
 847                 SW_FLOW_KEY_MEMCPY(match, ct.labels, cl->ct_labels,
 848                                    sizeof(*cl), is_mask);
 849                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_LABELS);
 850         }
 851         return 0;
 852 }
 853
 854 static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
 855                                 u64 attrs, const struct nlattr **a,
 856                                 bool is_mask, bool log)
 857 {
 858         int err;
 859
 860         err = metadata_from_nlattrs(net, match, &attrs, a, is_mask, log);
 861         if (err)
 862                 return err;
 863
 864         if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) {
 865                 const struct ovs_key_ethernet *eth_key;
 866
 867                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
 868                 SW_FLOW_KEY_MEMCPY(match, eth.src,
 869                                 eth_key->eth_src, ETH_ALEN, is_mask);
 870                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
 871                                 eth_key->eth_dst, ETH_ALEN, is_mask);
 872                 attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
 873         }
 874
 875         if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
 876                 __be16 tci;
 877
 878                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 879                 if (!(tci & htons(VLAN_TAG_PRESENT))) {
 880                         if (is_mask)
 881                                 OVS_NLERR(log, "VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.");
 882                         else
 883                                 OVS_NLERR(log, "VLAN TCI does not have VLAN_TAG_PRESENT bit set.");
 884
 885                         return -EINVAL;
 886                 }
 887
 888                 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
 889                 attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
 890         }
 891
 892         if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
 893                 __be16 eth_type;
 894
 895                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 896                 if (is_mask) {
 897                         /* Always exact match EtherType. */
 898                         eth_type = htons(0xffff);
 899                 } else if (!eth_proto_is_802_3(eth_type)) {
 900                         OVS_NLERR(log, "EtherType %x is less than min %x",
 901                                   ntohs(eth_type), ETH_P_802_3_MIN);
 902                         return -EINVAL;
 903                 }
 904
 905                 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
 906                 attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
 907         } else if (!is_mask) {
 908                 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
 909         }
 910
 911         if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
 912                 const struct ovs_key_ipv4 *ipv4_key;
 913
 914                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
 915                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
 916                         OVS_NLERR(log, "IPv4 frag type %d is out of range max %d",
 917                                   ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
 918                         return -EINVAL;
 919                 }
 920                 SW_FLOW_KEY_PUT(match, ip.proto,
 921                                 ipv4_key->ipv4_proto, is_mask);
 922                 SW_FLOW_KEY_PUT(match, ip.tos,
 923                                 ipv4_key->ipv4_tos, is_mask);
 924                 SW_FLOW_KEY_PUT(match, ip.ttl,
 925                                 ipv4_key->ipv4_ttl, is_mask);
 926                 SW_FLOW_KEY_PUT(match, ip.frag,
 927                                 ipv4_key->ipv4_frag, is_mask);
 928                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 929                                 ipv4_key->ipv4_src, is_mask);
 930                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 931                                 ipv4_key->ipv4_dst, is_mask);
 932                 attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
 933         }
 934
 935         if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
 936                 const struct ovs_key_ipv6 *ipv6_key;
 937
 938                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
 939                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
 940                         OVS_NLERR(log, "IPv6 frag type %d is out of range max %d",
 941                                   ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
 942                         return -EINVAL;
 943                 }
 944
 945                 if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) {
 946                         OVS_NLERR(log, "IPv6 flow label %x is out of range (max=%x).\n",
 947                                   ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
 948                         return -EINVAL;
 949                 }
 950
 951                 SW_FLOW_KEY_PUT(match, ipv6.label,
 952                                 ipv6_key->ipv6_label, is_mask);
 953                 SW_FLOW_KEY_PUT(match, ip.proto,
 954                                 ipv6_key->ipv6_proto, is_mask);
 955                 SW_FLOW_KEY_PUT(match, ip.tos,
 956                                 ipv6_key->ipv6_tclass, is_mask);
 957                 SW_FLOW_KEY_PUT(match, ip.ttl,
 958                                 ipv6_key->ipv6_hlimit, is_mask);
 959                 SW_FLOW_KEY_PUT(match, ip.frag,
 960                                 ipv6_key->ipv6_frag, is_mask);
 961                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
 962                                 ipv6_key->ipv6_src,
 963                                 sizeof(match->key->ipv6.addr.src),
 964                                 is_mask);
 965                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
 966                                 ipv6_key->ipv6_dst,
 967                                 sizeof(match->key->ipv6.addr.dst),
 968                                 is_mask);
 969
 970                 attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
 971         }
 972
 973         if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
 974                 const struct ovs_key_arp *arp_key;
 975
 976                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
 977                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
 978                         OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).",
 979                                   arp_key->arp_op);
 980                         return -EINVAL;
 981                 }
 982
 983                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 984                                 arp_key->arp_sip, is_mask);
 985                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 986                         arp_key->arp_tip, is_mask);
 987                 SW_FLOW_KEY_PUT(match, ip.proto,
 988                                 ntohs(arp_key->arp_op), is_mask);
 989                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
 990                                 arp_key->arp_sha, ETH_ALEN, is_mask);
 991                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
 992                                 arp_key->arp_tha, ETH_ALEN, is_mask);
 993
 994                 attrs &= ~(1 << OVS_KEY_ATTR_ARP);
 995         }
 996
 997         if (attrs & (1 << OVS_KEY_ATTR_MPLS)) {
 998                 const struct ovs_key_mpls *mpls_key;
 999
1000                 mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]);
1001                 SW_FLOW_KEY_PUT(match, mpls.top_lse,
1002                                 mpls_key->mpls_lse, is_mask);
1003
1004                 attrs &= ~(1 << OVS_KEY_ATTR_MPLS);
1005          }
1006
1007         if (attrs & (1 << OVS_KEY_ATTR_TCP)) {
1008                 const struct ovs_key_tcp *tcp_key;
1009
1010                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
1011                 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask);
1012                 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask);
1013                 attrs &= ~(1 << OVS_KEY_ATTR_TCP);
1014         }
1015
1016         if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
1017                 SW_FLOW_KEY_PUT(match, tp.flags,
1018                                 nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
1019                                 is_mask);
1020                 attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS);
1021         }
1022
1023         if (attrs & (1 << OVS_KEY_ATTR_UDP)) {
1024                 const struct ovs_key_udp *udp_key;
1025
1026                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
1027                 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask);
1028                 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask);
1029                 attrs &= ~(1 << OVS_KEY_ATTR_UDP);
1030         }
1031
1032         if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
1033                 const struct ovs_key_sctp *sctp_key;
1034
1035                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
1036                 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask);
1037                 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask);
1038                 attrs &= ~(1 << OVS_KEY_ATTR_SCTP);
1039         }
1040
1041         if (attrs & (1 << OVS_KEY_ATTR_ICMP)) {
1042                 const struct ovs_key_icmp *icmp_key;
1043
1044                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
1045                 SW_FLOW_KEY_PUT(match, tp.src,
1046                                 htons(icmp_key->icmp_type), is_mask);
1047                 SW_FLOW_KEY_PUT(match, tp.dst,
1048                                 htons(icmp_key->icmp_code), is_mask);
1049                 attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
1050         }
1051
1052         if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) {
1053                 const struct ovs_key_icmpv6 *icmpv6_key;
1054
1055                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
1056                 SW_FLOW_KEY_PUT(match, tp.src,
1057                                 htons(icmpv6_key->icmpv6_type), is_mask);
1058                 SW_FLOW_KEY_PUT(match, tp.dst,
1059                                 htons(icmpv6_key->icmpv6_code), is_mask);
1060                 attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
1061         }
1062
1063         if (attrs & (1 << OVS_KEY_ATTR_ND)) {
1064                 const struct ovs_key_nd *nd_key;
1065
1066                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
1067                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
1068                         nd_key->nd_target,
1069                         sizeof(match->key->ipv6.nd.target),
1070                         is_mask);
1071                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
1072                         nd_key->nd_sll, ETH_ALEN, is_mask);
1073                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
1074                                 nd_key->nd_tll, ETH_ALEN, is_mask);
1075                 attrs &= ~(1 << OVS_KEY_ATTR_ND);
1076         }
1077
1078         if (attrs != 0) {
1079                 OVS_NLERR(log, "Unknown key attributes %llx",
1080                           (unsigned long long)attrs);
1081                 return -EINVAL;
1082         }
1083
1084         return 0;
1085 }
1086
1087 static void nlattr_set(struct nlattr *attr, u8 val,
1088                        const struct ovs_len_tbl *tbl)
1089 {
1090         struct nlattr *nla;
1091         int rem;
1092
1093         /* The nlattr stream should already have been validated */
1094         nla_for_each_nested(nla, attr, rem) {
1095                 if (tbl[nla_type(nla)].len == OVS_ATTR_NESTED) {
1096                         if (tbl[nla_type(nla)].next)
1097                                 tbl = tbl[nla_type(nla)].next;
1098                         nlattr_set(nla, val, tbl);
1099                 } else {
1100                         memset(nla_data(nla), val, nla_len(nla));
1101                 }
1102         }
1103 }
1104
1105 static void mask_set_nlattr(struct nlattr *attr, u8 val)
1106 {
1107         nlattr_set(attr, val, ovs_key_lens);
1108 }
1109
1110 /**
1111  * ovs_nla_get_match - parses Netlink attributes into a flow key and
1112  * mask. In case the 'mask' is NULL, the flow is treated as exact match
1113  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
1114  * does not include any don't care bit.
1115  * @net: Used to determine per-namespace field support.
1116  * @match: receives the extracted flow match information.
1117  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1118  * sequence. The fields should of the packet that triggered the creation
1119  * of this flow.
1120  * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
1121  * attribute specifies the mask field of the wildcarded flow.
1122  * @log: Boolean to allow kernel error logging.  Normally true, but when
1123  * probing for feature compatibility this should be passed in as false to
1124  * suppress unnecessary error logging.
1125  */
1126 int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
1127                       const struct nlattr *nla_key,
1128                       const struct nlattr *nla_mask,
1129                       bool log)
1130 {
1131         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1132         const struct nlattr *encap;
1133         struct nlattr *newmask = NULL;
1134         u64 key_attrs = 0;
1135         u64 mask_attrs = 0;
1136         bool encap_valid = false;
1137         int err;
1138
1139         err = parse_flow_nlattrs(nla_key, a, &key_attrs, log);
1140         if (err)
1141                 return err;
1142
1143         if ((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
1144             (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
1145             (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
1146                 __be16 tci;
1147
1148                 if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
1149                       (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
1150                         OVS_NLERR(log, "Invalid Vlan frame.");
1151                         return -EINVAL;
1152                 }
1153
1154                 key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1155                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1156                 encap = a[OVS_KEY_ATTR_ENCAP];
1157                 key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
1158                 encap_valid = true;
1159
1160                 if (tci & htons(VLAN_TAG_PRESENT)) {
1161                         err = parse_flow_nlattrs(encap, a, &key_attrs, log);
1162                         if (err)
1163                                 return err;
1164                 } else if (!tci) {
1165                         /* Corner case for truncated 802.1Q header. */
1166                         if (nla_len(encap)) {
1167                                 OVS_NLERR(log, "Truncated 802.1Q header has non-zero encap attribute.");
1168                                 return -EINVAL;
1169                         }
1170                 } else {
1171                         OVS_NLERR(log, "Encap attr is set for non-VLAN frame");
1172                         return  -EINVAL;
1173                 }
1174         }
1175
1176         err = ovs_key_from_nlattrs(net, match, key_attrs, a, false, log);
1177         if (err)
1178                 return err;
1179
1180         if (match->mask) {
1181                 if (!nla_mask) {
1182                         /* Create an exact match mask. We need to set to 0xff
1183                          * all the 'match->mask' fields that have been touched
1184                          * in 'match->key'. We cannot simply memset
1185                          * 'match->mask', because padding bytes and fields not
1186                          * specified in 'match->key' should be left to 0.
1187                          * Instead, we use a stream of netlink attributes,
1188                          * copied from 'key' and set to 0xff.
1189                          * ovs_key_from_nlattrs() will take care of filling
1190                          * 'match->mask' appropriately.
1191                          */
1192                         newmask = kmemdup(nla_key,
1193                                           nla_total_size(nla_len(nla_key)),
1194                                           GFP_KERNEL);
1195                         if (!newmask)
1196                                 return -ENOMEM;
1197
1198                         mask_set_nlattr(newmask, 0xff);
1199
1200                         /* The userspace does not send tunnel attributes that
1201                          * are 0, but we should not wildcard them nonetheless.
1202                          */
1203                         if (match->key->tun_key.u.ipv4.dst)
1204                                 SW_FLOW_KEY_MEMSET_FIELD(match, tun_key,
1205                                                          0xff, true);
1206
1207                         nla_mask = newmask;
1208                 }
1209
1210                 err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log);
1211                 if (err)
1212                         goto free_newmask;
1213
1214                 /* Always match on tci. */
1215                 SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
1216
1217                 if (mask_attrs & 1 << OVS_KEY_ATTR_ENCAP) {
1218                         __be16 eth_type = 0;
1219                         __be16 tci = 0;
1220
1221                         if (!encap_valid) {
1222                                 OVS_NLERR(log, "Encap mask attribute is set for non-VLAN frame.");
1223                                 err = -EINVAL;
1224                                 goto free_newmask;
1225                         }
1226
1227                         mask_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
1228                         if (a[OVS_KEY_ATTR_ETHERTYPE])
1229                                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1230
1231                         if (eth_type == htons(0xffff)) {
1232                                 mask_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1233                                 encap = a[OVS_KEY_ATTR_ENCAP];
1234                                 err = parse_flow_mask_nlattrs(encap, a,
1235                                                               &mask_attrs, log);
1236                                 if (err)
1237                                         goto free_newmask;
1238                         } else {
1239                                 OVS_NLERR(log, "VLAN frames must have an exact match on the TPID (mask=%x).",
1240                                           ntohs(eth_type));
1241                                 err = -EINVAL;
1242                                 goto free_newmask;
1243                         }
1244
1245                         if (a[OVS_KEY_ATTR_VLAN])
1246                                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1247
1248                         if (!(tci & htons(VLAN_TAG_PRESENT))) {
1249                                 OVS_NLERR(log, "VLAN tag present bit must have an exact match (tci_mask=%x).",
1250                                           ntohs(tci));
1251                                 err = -EINVAL;
1252                                 goto free_newmask;
1253                         }
1254                 }
1255
1256                 err = ovs_key_from_nlattrs(net, match, mask_attrs, a, true,
1257                                            log);
1258                 if (err)
1259                         goto free_newmask;
1260         }
1261
1262         if (!match_validate(match, key_attrs, mask_attrs, log))
1263                 err = -EINVAL;
1264
1265 free_newmask:
1266         kfree(newmask);
1267         return err;
1268 }
1269
1270 static size_t get_ufid_len(const struct nlattr *attr, bool log)
1271 {
1272         size_t len;
1273
1274         if (!attr)
1275                 return 0;
1276
1277         len = nla_len(attr);
1278         if (len < 1 || len > MAX_UFID_LENGTH) {
1279                 OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)",
1280                           nla_len(attr), MAX_UFID_LENGTH);
1281                 return 0;
1282         }
1283
1284         return len;
1285 }
1286
1287 /* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID,
1288  * or false otherwise.
1289  */
1290 bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr,
1291                       bool log)
1292 {
1293         sfid->ufid_len = get_ufid_len(attr, log);
1294         if (sfid->ufid_len)
1295                 memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len);
1296
1297         return sfid->ufid_len;
1298 }
1299
1300 int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid,
1301                            const struct sw_flow_key *key, bool log)
1302 {
1303         struct sw_flow_key *new_key;
1304
1305         if (ovs_nla_get_ufid(sfid, ufid, log))
1306                 return 0;
1307
1308         /* If UFID was not provided, use unmasked key. */
1309         new_key = kmalloc(sizeof(*new_key), GFP_KERNEL);
1310         if (!new_key)
1311                 return -ENOMEM;
1312         memcpy(new_key, key, sizeof(*key));
1313         sfid->unmasked_key = new_key;
1314
1315         return 0;
1316 }
1317
1318 u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
1319 {
1320         return attr ? nla_get_u32(attr) : 0;
1321 }
1322
1323 /**
1324  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
1325  * @key: Receives extracted in_port, priority, tun_key and skb_mark.
1326  * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1327  * sequence.
1328  * @log: Boolean to allow kernel error logging.  Normally true, but when
1329  * probing for feature compatibility this should be passed in as false to
1330  * suppress unnecessary error logging.
1331  *
1332  * This parses a series of Netlink attributes that form a flow key, which must
1333  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1334  * get the metadata, that is, the parts of the flow key that cannot be
1335  * extracted from the packet itself.
1336  */
1337
1338 int ovs_nla_get_flow_metadata(struct net *net, const struct nlattr *attr,
1339                               struct sw_flow_key *key,
1340                               bool log)
1341 {
1342         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1343         struct sw_flow_match match;
1344         u64 attrs = 0;
1345         int err;
1346
1347         err = parse_flow_nlattrs(attr, a, &attrs, log);
1348         if (err)
1349                 return -EINVAL;
1350
1351         memset(&match, 0, sizeof(match));
1352         match.key = key;
1353
1354         memset(&key->ct, 0, sizeof(key->ct));
1355         key->phy.in_port = DP_MAX_PORTS;
1356
1357         return metadata_from_nlattrs(net, &match, &attrs, a, false, log);
1358 }
1359
1360 static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
1361                              const struct sw_flow_key *output, bool is_mask,
1362                              struct sk_buff *skb)
1363 {
1364         struct ovs_key_ethernet *eth_key;
1365         struct nlattr *nla, *encap;
1366
1367         if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
1368                 goto nla_put_failure;
1369
1370         if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
1371                 goto nla_put_failure;
1372
1373         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
1374                 goto nla_put_failure;
1375
1376         if ((swkey->tun_key.u.ipv4.dst || is_mask)) {
1377                 const void *opts = NULL;
1378
1379                 if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT)
1380                         opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len);
1381
1382                 if (ipv4_tun_to_nlattr(skb, &output->tun_key, opts,
1383                                        swkey->tun_opts_len))
1384                         goto nla_put_failure;
1385         }
1386
1387         if (swkey->phy.in_port == DP_MAX_PORTS) {
1388                 if (is_mask && (output->phy.in_port == 0xffff))
1389                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
1390                                 goto nla_put_failure;
1391         } else {
1392                 u16 upper_u16;
1393                 upper_u16 = !is_mask ? 0 : 0xffff;
1394
1395                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
1396                                 (upper_u16 << 16) | output->phy.in_port))
1397                         goto nla_put_failure;
1398         }
1399
1400         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
1401                 goto nla_put_failure;
1402
1403         if (ovs_ct_put_key(output, skb))
1404                 goto nla_put_failure;
1405
1406         nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
1407         if (!nla)
1408                 goto nla_put_failure;
1409
1410         eth_key = nla_data(nla);
1411         ether_addr_copy(eth_key->eth_src, output->eth.src);
1412         ether_addr_copy(eth_key->eth_dst, output->eth.dst);
1413
1414         if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
1415                 __be16 eth_type;
1416                 eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
1417                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
1418                     nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
1419                         goto nla_put_failure;
1420                 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
1421                 if (!swkey->eth.tci)
1422                         goto unencap;
1423         } else
1424                 encap = NULL;
1425
1426         if (swkey->eth.type == htons(ETH_P_802_2)) {
1427                 /*
1428                  * Ethertype 802.2 is represented in the netlink with omitted
1429                  * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
1430                  * 0xffff in the mask attribute.  Ethertype can also
1431                  * be wildcarded.
1432                  */
1433                 if (is_mask && output->eth.type)
1434                         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
1435                                                 output->eth.type))
1436                                 goto nla_put_failure;
1437                 goto unencap;
1438         }
1439
1440         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
1441                 goto nla_put_failure;
1442
1443         if (swkey->eth.type == htons(ETH_P_IP)) {
1444                 struct ovs_key_ipv4 *ipv4_key;
1445
1446                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1447                 if (!nla)
1448                         goto nla_put_failure;
1449                 ipv4_key = nla_data(nla);
1450                 ipv4_key->ipv4_src = output->ipv4.addr.src;
1451                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
1452                 ipv4_key->ipv4_proto = output->ip.proto;
1453                 ipv4_key->ipv4_tos = output->ip.tos;
1454                 ipv4_key->ipv4_ttl = output->ip.ttl;
1455                 ipv4_key->ipv4_frag = output->ip.frag;
1456         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1457                 struct ovs_key_ipv6 *ipv6_key;
1458
1459                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1460                 if (!nla)
1461                         goto nla_put_failure;
1462                 ipv6_key = nla_data(nla);
1463                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
1464                                 sizeof(ipv6_key->ipv6_src));
1465                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
1466                                 sizeof(ipv6_key->ipv6_dst));
1467                 ipv6_key->ipv6_label = output->ipv6.label;
1468                 ipv6_key->ipv6_proto = output->ip.proto;
1469                 ipv6_key->ipv6_tclass = output->ip.tos;
1470                 ipv6_key->ipv6_hlimit = output->ip.ttl;
1471                 ipv6_key->ipv6_frag = output->ip.frag;
1472         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1473                    swkey->eth.type == htons(ETH_P_RARP)) {
1474                 struct ovs_key_arp *arp_key;
1475
1476                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1477                 if (!nla)
1478                         goto nla_put_failure;
1479                 arp_key = nla_data(nla);
1480                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1481                 arp_key->arp_sip = output->ipv4.addr.src;
1482                 arp_key->arp_tip = output->ipv4.addr.dst;
1483                 arp_key->arp_op = htons(output->ip.proto);
1484                 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
1485                 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
1486         } else if (eth_p_mpls(swkey->eth.type)) {
1487                 struct ovs_key_mpls *mpls_key;
1488
1489                 nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS, sizeof(*mpls_key));
1490                 if (!nla)
1491                         goto nla_put_failure;
1492                 mpls_key = nla_data(nla);
1493                 mpls_key->mpls_lse = output->mpls.top_lse;
1494         }
1495
1496         if ((swkey->eth.type == htons(ETH_P_IP) ||
1497              swkey->eth.type == htons(ETH_P_IPV6)) &&
1498              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1499
1500                 if (swkey->ip.proto == IPPROTO_TCP) {
1501                         struct ovs_key_tcp *tcp_key;
1502
1503                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1504                         if (!nla)
1505                                 goto nla_put_failure;
1506                         tcp_key = nla_data(nla);
1507                         tcp_key->tcp_src = output->tp.src;
1508                         tcp_key->tcp_dst = output->tp.dst;
1509                         if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1510                                          output->tp.flags))
1511                                 goto nla_put_failure;
1512                 } else if (swkey->ip.proto == IPPROTO_UDP) {
1513                         struct ovs_key_udp *udp_key;
1514
1515                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1516                         if (!nla)
1517                                 goto nla_put_failure;
1518                         udp_key = nla_data(nla);
1519                         udp_key->udp_src = output->tp.src;
1520                         udp_key->udp_dst = output->tp.dst;
1521                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
1522                         struct ovs_key_sctp *sctp_key;
1523
1524                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
1525                         if (!nla)
1526                                 goto nla_put_failure;
1527                         sctp_key = nla_data(nla);
1528                         sctp_key->sctp_src = output->tp.src;
1529                         sctp_key->sctp_dst = output->tp.dst;
1530                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1531                            swkey->ip.proto == IPPROTO_ICMP) {
1532                         struct ovs_key_icmp *icmp_key;
1533
1534                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1535                         if (!nla)
1536                                 goto nla_put_failure;
1537                         icmp_key = nla_data(nla);
1538                         icmp_key->icmp_type = ntohs(output->tp.src);
1539                         icmp_key->icmp_code = ntohs(output->tp.dst);
1540                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1541                            swkey->ip.proto == IPPROTO_ICMPV6) {
1542                         struct ovs_key_icmpv6 *icmpv6_key;
1543
1544                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1545                                                 sizeof(*icmpv6_key));
1546                         if (!nla)
1547                                 goto nla_put_failure;
1548                         icmpv6_key = nla_data(nla);
1549                         icmpv6_key->icmpv6_type = ntohs(output->tp.src);
1550                         icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
1551
1552                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1553                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1554                                 struct ovs_key_nd *nd_key;
1555
1556                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1557                                 if (!nla)
1558                                         goto nla_put_failure;
1559                                 nd_key = nla_data(nla);
1560                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
1561                                                         sizeof(nd_key->nd_target));
1562                                 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
1563                                 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
1564                         }
1565                 }
1566         }
1567
1568 unencap:
1569         if (encap)
1570                 nla_nest_end(skb, encap);
1571
1572         return 0;
1573
1574 nla_put_failure:
1575         return -EMSGSIZE;
1576 }
1577
1578 int ovs_nla_put_key(const struct sw_flow_key *swkey,
1579                     const struct sw_flow_key *output, int attr, bool is_mask,
1580                     struct sk_buff *skb)
1581 {
1582         int err;
1583         struct nlattr *nla;
1584
1585         nla = nla_nest_start(skb, attr);
1586         if (!nla)
1587                 return -EMSGSIZE;
1588         err = __ovs_nla_put_key(swkey, output, is_mask, skb);
1589         if (err)
1590                 return err;
1591         nla_nest_end(skb, nla);
1592
1593         return 0;
1594 }
1595
1596 /* Called with ovs_mutex or RCU read lock. */
1597 int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb)
1598 {
1599         if (ovs_identifier_is_ufid(&flow->id))
1600                 return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len,
1601                                flow->id.ufid);
1602
1603         return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key,
1604                                OVS_FLOW_ATTR_KEY, false, skb);
1605 }
1606
1607 /* Called with ovs_mutex or RCU read lock. */
1608 int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb)
1609 {
1610         return ovs_nla_put_key(&flow->key, &flow->key,
1611                                 OVS_FLOW_ATTR_KEY, false, skb);
1612 }
1613
1614 /* Called with ovs_mutex or RCU read lock. */
1615 int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb)
1616 {
1617         return ovs_nla_put_key(&flow->key, &flow->mask->key,
1618                                 OVS_FLOW_ATTR_MASK, true, skb);
1619 }
1620
1621 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
1622
1623 static struct sw_flow_actions *nla_alloc_flow_actions(int size, bool log)
1624 {
1625         struct sw_flow_actions *sfa;
1626
1627         if (size > MAX_ACTIONS_BUFSIZE) {
1628                 OVS_NLERR(log, "Flow action size %u bytes exceeds max", size);
1629                 return ERR_PTR(-EINVAL);
1630         }
1631
1632         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
1633         if (!sfa)
1634                 return ERR_PTR(-ENOMEM);
1635
1636         sfa->actions_len = 0;
1637         return sfa;
1638 }
1639
1640 static void ovs_nla_free_set_action(const struct nlattr *a)
1641 {
1642         const struct nlattr *ovs_key = nla_data(a);
1643         struct ovs_tunnel_info *ovs_tun;
1644
1645         switch (nla_type(ovs_key)) {
1646         case OVS_KEY_ATTR_TUNNEL_INFO:
1647                 ovs_tun = nla_data(ovs_key);
1648                 dst_release((struct dst_entry *)ovs_tun->tun_dst);
1649                 break;
1650         }
1651 }
1652
1653 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
1654 {
1655         const struct nlattr *a;
1656         int rem;
1657
1658         if (!sf_acts)
1659                 return;
1660
1661         nla_for_each_attr(a, sf_acts->actions, sf_acts->actions_len, rem) {
1662                 switch (nla_type(a)) {
1663                 case OVS_ACTION_ATTR_SET:
1664                         ovs_nla_free_set_action(a);
1665                         break;
1666                 case OVS_ACTION_ATTR_CT:
1667                         ovs_ct_free_action(a);
1668                         break;
1669                 }
1670         }
1671
1672         kfree(sf_acts);
1673 }
1674
1675 static void __ovs_nla_free_flow_actions(struct rcu_head *head)
1676 {
1677         ovs_nla_free_flow_actions(container_of(head, struct sw_flow_actions, rcu));
1678 }
1679
1680 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
1681  * The caller must hold rcu_read_lock for this to be sensible. */
1682 void ovs_nla_free_flow_actions_rcu(struct sw_flow_actions *sf_acts)
1683 {
1684         call_rcu(&sf_acts->rcu, __ovs_nla_free_flow_actions);
1685 }
1686
1687 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
1688                                        int attr_len, bool log)
1689 {
1690
1691         struct sw_flow_actions *acts;
1692         int new_acts_size;
1693         int req_size = NLA_ALIGN(attr_len);
1694         int next_offset = offsetof(struct sw_flow_actions, actions) +
1695                                         (*sfa)->actions_len;
1696
1697         if (req_size <= (ksize(*sfa) - next_offset))
1698                 goto out;
1699
1700         new_acts_size = ksize(*sfa) * 2;
1701
1702         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
1703                 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
1704                         return ERR_PTR(-EMSGSIZE);
1705                 new_acts_size = MAX_ACTIONS_BUFSIZE;
1706         }
1707
1708         acts = nla_alloc_flow_actions(new_acts_size, log);
1709         if (IS_ERR(acts))
1710                 return (void *)acts;
1711
1712         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
1713         acts->actions_len = (*sfa)->actions_len;
1714         acts->orig_len = (*sfa)->orig_len;
1715         kfree(*sfa);
1716         *sfa = acts;
1717
1718 out:
1719         (*sfa)->actions_len += req_size;
1720         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
1721 }
1722
1723 static struct nlattr *__add_action(struct sw_flow_actions **sfa,
1724                                    int attrtype, void *data, int len, bool log)
1725 {
1726         struct nlattr *a;
1727
1728         a = reserve_sfa_size(sfa, nla_attr_size(len), log);
1729         if (IS_ERR(a))
1730                 return a;
1731
1732         a->nla_type = attrtype;
1733         a->nla_len = nla_attr_size(len);
1734
1735         if (data)
1736                 memcpy(nla_data(a), data, len);
1737         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
1738
1739         return a;
1740 }
1741
1742 int ovs_nla_add_action(struct sw_flow_actions **sfa, int attrtype, void *data,
1743                        int len, bool log)
1744 {
1745         struct nlattr *a;
1746
1747         a = __add_action(sfa, attrtype, data, len, log);
1748
1749         return PTR_ERR_OR_ZERO(a);
1750 }
1751
1752 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
1753                                           int attrtype, bool log)
1754 {
1755         int used = (*sfa)->actions_len;
1756         int err;
1757
1758         err = ovs_nla_add_action(sfa, attrtype, NULL, 0, log);
1759         if (err)
1760                 return err;
1761
1762         return used;
1763 }
1764
1765 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
1766                                          int st_offset)
1767 {
1768         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
1769                                                                st_offset);
1770
1771         a->nla_len = sfa->actions_len - st_offset;
1772 }
1773
1774 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
1775                                   const struct sw_flow_key *key,
1776                                   int depth, struct sw_flow_actions **sfa,
1777                                   __be16 eth_type, __be16 vlan_tci, bool log);
1778
1779 static int validate_and_copy_sample(struct net *net, const struct nlattr *attr,
1780                                     const struct sw_flow_key *key, int depth,
1781                                     struct sw_flow_actions **sfa,
1782                                     __be16 eth_type, __be16 vlan_tci, bool log)
1783 {
1784         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
1785         const struct nlattr *probability, *actions;
1786         const struct nlattr *a;
1787         int rem, start, err, st_acts;
1788
1789         memset(attrs, 0, sizeof(attrs));
1790         nla_for_each_nested(a, attr, rem) {
1791                 int type = nla_type(a);
1792                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
1793                         return -EINVAL;
1794                 attrs[type] = a;
1795         }
1796         if (rem)
1797                 return -EINVAL;
1798
1799         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
1800         if (!probability || nla_len(probability) != sizeof(u32))
1801                 return -EINVAL;
1802
1803         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
1804         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
1805                 return -EINVAL;
1806
1807         /* validation done, copy sample action. */
1808         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log);
1809         if (start < 0)
1810                 return start;
1811         err = ovs_nla_add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY,
1812                                  nla_data(probability), sizeof(u32), log);
1813         if (err)
1814                 return err;
1815         st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS, log);
1816         if (st_acts < 0)
1817                 return st_acts;
1818
1819         err = __ovs_nla_copy_actions(net, actions, key, depth + 1, sfa,
1820                                      eth_type, vlan_tci, log);
1821         if (err)
1822                 return err;
1823
1824         add_nested_action_end(*sfa, st_acts);
1825         add_nested_action_end(*sfa, start);
1826
1827         return 0;
1828 }
1829
1830 void ovs_match_init(struct sw_flow_match *match,
1831                     struct sw_flow_key *key,
1832                     struct sw_flow_mask *mask)
1833 {
1834         memset(match, 0, sizeof(*match));
1835         match->key = key;
1836         match->mask = mask;
1837
1838         memset(key, 0, sizeof(*key));
1839
1840         if (mask) {
1841                 memset(&mask->key, 0, sizeof(mask->key));
1842                 mask->range.start = mask->range.end = 0;
1843         }
1844 }
1845
1846 static int validate_geneve_opts(struct sw_flow_key *key)
1847 {
1848         struct geneve_opt *option;
1849         int opts_len = key->tun_opts_len;
1850         bool crit_opt = false;
1851
1852         option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len);
1853         while (opts_len > 0) {
1854                 int len;
1855
1856                 if (opts_len < sizeof(*option))
1857                         return -EINVAL;
1858
1859                 len = sizeof(*option) + option->length * 4;
1860                 if (len > opts_len)
1861                         return -EINVAL;
1862
1863                 crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE);
1864
1865                 option = (struct geneve_opt *)((u8 *)option + len);
1866                 opts_len -= len;
1867         };
1868
1869         key->tun_key.tun_flags |= crit_opt ? TUNNEL_CRIT_OPT : 0;
1870
1871         return 0;
1872 }
1873
1874 static int validate_and_copy_set_tun(const struct nlattr *attr,
1875                                      struct sw_flow_actions **sfa, bool log)
1876 {
1877         struct sw_flow_match match;
1878         struct sw_flow_key key;
1879         struct metadata_dst *tun_dst;
1880         struct ip_tunnel_info *tun_info;
1881         struct ovs_tunnel_info *ovs_tun;
1882         struct nlattr *a;
1883         int err = 0, start, opts_type;
1884
1885         ovs_match_init(&match, &key, NULL);
1886         opts_type = ipv4_tun_from_nlattr(nla_data(attr), &match, false, log);
1887         if (opts_type < 0)
1888                 return opts_type;
1889
1890         if (key.tun_opts_len) {
1891                 switch (opts_type) {
1892                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
1893                         err = validate_geneve_opts(&key);
1894                         if (err < 0)
1895                                 return err;
1896                         break;
1897                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
1898                         break;
1899                 }
1900         };
1901
1902         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log);
1903         if (start < 0)
1904                 return start;
1905
1906         tun_dst = metadata_dst_alloc(key.tun_opts_len, GFP_KERNEL);
1907         if (!tun_dst)
1908                 return -ENOMEM;
1909
1910         a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
1911                          sizeof(*ovs_tun), log);
1912         if (IS_ERR(a)) {
1913                 dst_release((struct dst_entry *)tun_dst);
1914                 return PTR_ERR(a);
1915         }
1916
1917         ovs_tun = nla_data(a);
1918         ovs_tun->tun_dst = tun_dst;
1919
1920         tun_info = &tun_dst->u.tun_info;
1921         tun_info->mode = IP_TUNNEL_INFO_TX;
1922         tun_info->key = key.tun_key;
1923
1924         /* We need to store the options in the action itself since
1925          * everything else will go away after flow setup. We can append
1926          * it to tun_info and then point there.
1927          */
1928         ip_tunnel_info_opts_set(tun_info,
1929                                 TUN_METADATA_OPTS(&key, key.tun_opts_len),
1930                                 key.tun_opts_len);
1931         add_nested_action_end(*sfa, start);
1932
1933         return err;
1934 }
1935
1936 /* Return false if there are any non-masked bits set.
1937  * Mask follows data immediately, before any netlink padding.
1938  */
1939 static bool validate_masked(u8 *data, int len)
1940 {
1941         u8 *mask = data + len;
1942
1943         while (len--)
1944                 if (*data++ & ~*mask++)
1945                         return false;
1946
1947         return true;
1948 }
1949
1950 static int validate_set(const struct nlattr *a,
1951                         const struct sw_flow_key *flow_key,
1952                         struct sw_flow_actions **sfa,
1953                         bool *skip_copy, __be16 eth_type, bool masked, bool log)
1954 {
1955         const struct nlattr *ovs_key = nla_data(a);
1956         int key_type = nla_type(ovs_key);
1957         size_t key_len;
1958
1959         /* There can be only one key in a action */
1960         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
1961                 return -EINVAL;
1962
1963         key_len = nla_len(ovs_key);
1964         if (masked)
1965                 key_len /= 2;
1966
1967         if (key_type > OVS_KEY_ATTR_MAX ||
1968             !check_attr_len(key_len, ovs_key_lens[key_type].len))
1969                 return -EINVAL;
1970
1971         if (masked && !validate_masked(nla_data(ovs_key), key_len))
1972                 return -EINVAL;
1973
1974         switch (key_type) {
1975         const struct ovs_key_ipv4 *ipv4_key;
1976         const struct ovs_key_ipv6 *ipv6_key;
1977         int err;
1978
1979         case OVS_KEY_ATTR_PRIORITY:
1980         case OVS_KEY_ATTR_SKB_MARK:
1981         case OVS_KEY_ATTR_CT_MARK:
1982         case OVS_KEY_ATTR_CT_LABELS:
1983         case OVS_KEY_ATTR_ETHERNET:
1984                 break;
1985
1986         case OVS_KEY_ATTR_TUNNEL:
1987                 if (eth_p_mpls(eth_type))
1988                         return -EINVAL;
1989
1990                 if (masked)
1991                         return -EINVAL; /* Masked tunnel set not supported. */
1992
1993                 *skip_copy = true;
1994                 err = validate_and_copy_set_tun(a, sfa, log);
1995                 if (err)
1996                         return err;
1997                 break;
1998
1999         case OVS_KEY_ATTR_IPV4:
2000                 if (eth_type != htons(ETH_P_IP))
2001                         return -EINVAL;
2002
2003                 ipv4_key = nla_data(ovs_key);
2004
2005                 if (masked) {
2006                         const struct ovs_key_ipv4 *mask = ipv4_key + 1;
2007
2008                         /* Non-writeable fields. */
2009                         if (mask->ipv4_proto || mask->ipv4_frag)
2010                                 return -EINVAL;
2011                 } else {
2012                         if (ipv4_key->ipv4_proto != flow_key->ip.proto)
2013                                 return -EINVAL;
2014
2015                         if (ipv4_key->ipv4_frag != flow_key->ip.frag)
2016                                 return -EINVAL;
2017                 }
2018                 break;
2019
2020         case OVS_KEY_ATTR_IPV6:
2021                 if (eth_type != htons(ETH_P_IPV6))
2022                         return -EINVAL;
2023
2024                 ipv6_key = nla_data(ovs_key);
2025
2026                 if (masked) {
2027                         const struct ovs_key_ipv6 *mask = ipv6_key + 1;
2028
2029                         /* Non-writeable fields. */
2030                         if (mask->ipv6_proto || mask->ipv6_frag)
2031                                 return -EINVAL;
2032
2033                         /* Invalid bits in the flow label mask? */
2034                         if (ntohl(mask->ipv6_label) & 0xFFF00000)
2035                                 return -EINVAL;
2036                 } else {
2037                         if (ipv6_key->ipv6_proto != flow_key->ip.proto)
2038                                 return -EINVAL;
2039
2040                         if (ipv6_key->ipv6_frag != flow_key->ip.frag)
2041                                 return -EINVAL;
2042                 }
2043                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
2044                         return -EINVAL;
2045
2046                 break;
2047
2048         case OVS_KEY_ATTR_TCP:
2049                 if ((eth_type != htons(ETH_P_IP) &&
2050                      eth_type != htons(ETH_P_IPV6)) ||
2051                     flow_key->ip.proto != IPPROTO_TCP)
2052                         return -EINVAL;
2053
2054                 break;
2055
2056         case OVS_KEY_ATTR_UDP:
2057                 if ((eth_type != htons(ETH_P_IP) &&
2058                      eth_type != htons(ETH_P_IPV6)) ||
2059                     flow_key->ip.proto != IPPROTO_UDP)
2060                         return -EINVAL;
2061
2062                 break;
2063
2064         case OVS_KEY_ATTR_MPLS:
2065                 if (!eth_p_mpls(eth_type))
2066                         return -EINVAL;
2067                 break;
2068
2069         case OVS_KEY_ATTR_SCTP:
2070                 if ((eth_type != htons(ETH_P_IP) &&
2071                      eth_type != htons(ETH_P_IPV6)) ||
2072                     flow_key->ip.proto != IPPROTO_SCTP)
2073                         return -EINVAL;
2074
2075                 break;
2076
2077         default:
2078                 return -EINVAL;
2079         }
2080
2081         /* Convert non-masked non-tunnel set actions to masked set actions. */
2082         if (!masked && key_type != OVS_KEY_ATTR_TUNNEL) {
2083                 int start, len = key_len * 2;
2084                 struct nlattr *at;
2085
2086                 *skip_copy = true;
2087
2088                 start = add_nested_action_start(sfa,
2089                                                 OVS_ACTION_ATTR_SET_TO_MASKED,
2090                                                 log);
2091                 if (start < 0)
2092                         return start;
2093
2094                 at = __add_action(sfa, key_type, NULL, len, log);
2095                 if (IS_ERR(at))
2096                         return PTR_ERR(at);
2097
2098                 memcpy(nla_data(at), nla_data(ovs_key), key_len); /* Key. */
2099                 memset(nla_data(at) + key_len, 0xff, key_len);    /* Mask. */
2100                 /* Clear non-writeable bits from otherwise writeable fields. */
2101                 if (key_type == OVS_KEY_ATTR_IPV6) {
2102                         struct ovs_key_ipv6 *mask = nla_data(at) + key_len;
2103
2104                         mask->ipv6_label &= htonl(0x000FFFFF);
2105                 }
2106                 add_nested_action_end(*sfa, start);
2107         }
2108
2109         return 0;
2110 }
2111
2112 static int validate_userspace(const struct nlattr *attr)
2113 {
2114         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
2115                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
2116                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
2117                 [OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 },
2118         };
2119         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
2120         int error;
2121
2122         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
2123                                  attr, userspace_policy);
2124         if (error)
2125                 return error;
2126
2127         if (!a[OVS_USERSPACE_ATTR_PID] ||
2128             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
2129                 return -EINVAL;
2130
2131         return 0;
2132 }
2133
2134 static int copy_action(const struct nlattr *from,
2135                        struct sw_flow_actions **sfa, bool log)
2136 {
2137         int totlen = NLA_ALIGN(from->nla_len);
2138         struct nlattr *to;
2139
2140         to = reserve_sfa_size(sfa, from->nla_len, log);
2141         if (IS_ERR(to))
2142                 return PTR_ERR(to);
2143
2144         memcpy(to, from, totlen);
2145         return 0;
2146 }
2147
2148 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
2149                                   const struct sw_flow_key *key,
2150                                   int depth, struct sw_flow_actions **sfa,
2151                                   __be16 eth_type, __be16 vlan_tci, bool log)
2152 {
2153         const struct nlattr *a;
2154         int rem, err;
2155
2156         if (depth >= SAMPLE_ACTION_DEPTH)
2157                 return -EOVERFLOW;
2158
2159         nla_for_each_nested(a, attr, rem) {
2160                 /* Expected argument lengths, (u32)-1 for variable length. */
2161                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
2162                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
2163                         [OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
2164                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
2165                         [OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls),
2166                         [OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16),
2167                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
2168                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
2169                         [OVS_ACTION_ATTR_SET] = (u32)-1,
2170                         [OVS_ACTION_ATTR_SET_MASKED] = (u32)-1,
2171                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
2172                         [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash),
2173                         [OVS_ACTION_ATTR_CT] = (u32)-1,
2174                 };
2175                 const struct ovs_action_push_vlan *vlan;
2176                 int type = nla_type(a);
2177                 bool skip_copy;
2178
2179                 if (type > OVS_ACTION_ATTR_MAX ||
2180                     (action_lens[type] != nla_len(a) &&
2181                      action_lens[type] != (u32)-1))
2182                         return -EINVAL;
2183
2184                 skip_copy = false;
2185                 switch (type) {
2186                 case OVS_ACTION_ATTR_UNSPEC:
2187                         return -EINVAL;
2188
2189                 case OVS_ACTION_ATTR_USERSPACE:
2190                         err = validate_userspace(a);
2191                         if (err)
2192                                 return err;
2193                         break;
2194
2195                 case OVS_ACTION_ATTR_OUTPUT:
2196                         if (nla_get_u32(a) >= DP_MAX_PORTS)
2197                                 return -EINVAL;
2198                         break;
2199
2200                 case OVS_ACTION_ATTR_HASH: {
2201                         const struct ovs_action_hash *act_hash = nla_data(a);
2202
2203                         switch (act_hash->hash_alg) {
2204                         case OVS_HASH_ALG_L4:
2205                                 break;
2206                         default:
2207                                 return  -EINVAL;
2208                         }
2209
2210                         break;
2211                 }
2212
2213                 case OVS_ACTION_ATTR_POP_VLAN:
2214                         vlan_tci = htons(0);
2215                         break;
2216
2217                 case OVS_ACTION_ATTR_PUSH_VLAN:
2218                         vlan = nla_data(a);
2219                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
2220                                 return -EINVAL;
2221                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
2222                                 return -EINVAL;
2223                         vlan_tci = vlan->vlan_tci;
2224                         break;
2225
2226                 case OVS_ACTION_ATTR_RECIRC:
2227                         break;
2228
2229                 case OVS_ACTION_ATTR_PUSH_MPLS: {
2230                         const struct ovs_action_push_mpls *mpls = nla_data(a);
2231
2232                         if (!eth_p_mpls(mpls->mpls_ethertype))
2233                                 return -EINVAL;
2234                         /* Prohibit push MPLS other than to a white list
2235                          * for packets that have a known tag order.
2236                          */
2237                         if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
2238                             (eth_type != htons(ETH_P_IP) &&
2239                              eth_type != htons(ETH_P_IPV6) &&
2240                              eth_type != htons(ETH_P_ARP) &&
2241                              eth_type != htons(ETH_P_RARP) &&
2242                              !eth_p_mpls(eth_type)))
2243                                 return -EINVAL;
2244                         eth_type = mpls->mpls_ethertype;
2245                         break;
2246                 }
2247
2248                 case OVS_ACTION_ATTR_POP_MPLS:
2249                         if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
2250                             !eth_p_mpls(eth_type))
2251                                 return -EINVAL;
2252
2253                         /* Disallow subsequent L2.5+ set and mpls_pop actions
2254                          * as there is no check here to ensure that the new
2255                          * eth_type is valid and thus set actions could
2256                          * write off the end of the packet or otherwise
2257                          * corrupt it.
2258                          *
2259                          * Support for these actions is planned using packet
2260                          * recirculation.
2261                          */
2262                         eth_type = htons(0);
2263                         break;
2264
2265                 case OVS_ACTION_ATTR_SET:
2266                         err = validate_set(a, key, sfa,
2267                                            &skip_copy, eth_type, false, log);
2268                         if (err)
2269                                 return err;
2270                         break;
2271
2272                 case OVS_ACTION_ATTR_SET_MASKED:
2273                         err = validate_set(a, key, sfa,
2274                                            &skip_copy, eth_type, true, log);
2275                         if (err)
2276                                 return err;
2277                         break;
2278
2279                 case OVS_ACTION_ATTR_SAMPLE:
2280                         err = validate_and_copy_sample(net, a, key, depth, sfa,
2281                                                        eth_type, vlan_tci, log);
2282                         if (err)
2283                                 return err;
2284                         skip_copy = true;
2285                         break;
2286
2287                 case OVS_ACTION_ATTR_CT:
2288                         err = ovs_ct_copy_action(net, a, key, sfa, log);
2289                         if (err)
2290                                 return err;
2291                         skip_copy = true;
2292                         break;
2293
2294                 default:
2295                         OVS_NLERR(log, "Unknown Action type %d", type);
2296                         return -EINVAL;
2297                 }
2298                 if (!skip_copy) {
2299                         err = copy_action(a, sfa, log);
2300                         if (err)
2301                                 return err;
2302                 }
2303         }
2304
2305         if (rem > 0)
2306                 return -EINVAL;
2307
2308         return 0;
2309 }
2310
2311 /* 'key' must be the masked key. */
2312 int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
2313                          const struct sw_flow_key *key,
2314                          struct sw_flow_actions **sfa, bool log)
2315 {
2316         int err;
2317
2318         *sfa = nla_alloc_flow_actions(nla_len(attr), log);
2319         if (IS_ERR(*sfa))
2320                 return PTR_ERR(*sfa);
2321
2322         (*sfa)->orig_len = nla_len(attr);
2323         err = __ovs_nla_copy_actions(net, attr, key, 0, sfa, key->eth.type,
2324                                      key->eth.tci, log);
2325         if (err)
2326                 ovs_nla_free_flow_actions(*sfa);
2327
2328         return err;
2329 }
2330
2331 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
2332 {
2333         const struct nlattr *a;
2334         struct nlattr *start;
2335         int err = 0, rem;
2336
2337         start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
2338         if (!start)
2339                 return -EMSGSIZE;
2340
2341         nla_for_each_nested(a, attr, rem) {
2342                 int type = nla_type(a);
2343                 struct nlattr *st_sample;
2344
2345                 switch (type) {
2346                 case OVS_SAMPLE_ATTR_PROBABILITY:
2347                         if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY,
2348                                     sizeof(u32), nla_data(a)))
2349                                 return -EMSGSIZE;
2350                         break;
2351                 case OVS_SAMPLE_ATTR_ACTIONS:
2352                         st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
2353                         if (!st_sample)
2354                                 return -EMSGSIZE;
2355                         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
2356                         if (err)
2357                                 return err;
2358                         nla_nest_end(skb, st_sample);
2359                         break;
2360                 }
2361         }
2362
2363         nla_nest_end(skb, start);
2364         return err;
2365 }
2366
2367 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
2368 {
2369         const struct nlattr *ovs_key = nla_data(a);
2370         int key_type = nla_type(ovs_key);
2371         struct nlattr *start;
2372         int err;
2373
2374         switch (key_type) {
2375         case OVS_KEY_ATTR_TUNNEL_INFO: {
2376                 struct ovs_tunnel_info *ovs_tun = nla_data(ovs_key);
2377                 struct ip_tunnel_info *tun_info = &ovs_tun->tun_dst->u.tun_info;
2378
2379                 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
2380                 if (!start)
2381                         return -EMSGSIZE;
2382
2383                 err = ipv4_tun_to_nlattr(skb, &tun_info->key,
2384                                          tun_info->options_len ?
2385                                              ip_tunnel_info_opts(tun_info) : NULL,
2386                                          tun_info->options_len);
2387                 if (err)
2388                         return err;
2389                 nla_nest_end(skb, start);
2390                 break;
2391         }
2392         default:
2393                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
2394                         return -EMSGSIZE;
2395                 break;
2396         }
2397
2398         return 0;
2399 }
2400
2401 static int masked_set_action_to_set_action_attr(const struct nlattr *a,
2402                                                 struct sk_buff *skb)
2403 {
2404         const struct nlattr *ovs_key = nla_data(a);
2405         struct nlattr *nla;
2406         size_t key_len = nla_len(ovs_key) / 2;
2407
2408         /* Revert the conversion we did from a non-masked set action to
2409          * masked set action.
2410          */
2411         nla = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
2412         if (!nla)
2413                 return -EMSGSIZE;
2414
2415         if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key)))
2416                 return -EMSGSIZE;
2417
2418         nla_nest_end(skb, nla);
2419         return 0;
2420 }
2421
2422 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
2423 {
2424         const struct nlattr *a;
2425         int rem, err;
2426
2427         nla_for_each_attr(a, attr, len, rem) {
2428                 int type = nla_type(a);
2429
2430                 switch (type) {
2431                 case OVS_ACTION_ATTR_SET:
2432                         err = set_action_to_attr(a, skb);
2433                         if (err)
2434                                 return err;
2435                         break;
2436
2437                 case OVS_ACTION_ATTR_SET_TO_MASKED:
2438                         err = masked_set_action_to_set_action_attr(a, skb);
2439                         if (err)
2440                                 return err;
2441                         break;
2442
2443                 case OVS_ACTION_ATTR_SAMPLE:
2444                         err = sample_action_to_attr(a, skb);
2445                         if (err)
2446                                 return err;
2447                         break;
2448
2449                 case OVS_ACTION_ATTR_CT:
2450                         err = ovs_ct_action_to_attr(nla_data(a), skb);
2451                         if (err)
2452                                 return err;
2453                         break;
2454
2455                 default:
2456                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
2457                                 return -EMSGSIZE;
2458                         break;
2459                 }
2460         }
2461
2462         return 0;
2463 }