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(16) /* OVS_TUNNEL_KEY_ATTR_IPV[46]_SRC */ 266 + nla_total_size(16) /* OVS_TUNNEL_KEY_ATTR_IPV[46]_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(1) /* 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_LABEL */ 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 [OVS_TUNNEL_KEY_ATTR_IPV6_SRC] = { .len = sizeof(struct in6_addr) }, 327 [OVS_TUNNEL_KEY_ATTR_IPV6_DST] = { .len = sizeof(struct in6_addr) }, 328 }; 329 330 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */ 331 static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = { 332 [OVS_KEY_ATTR_ENCAP] = { .len = OVS_ATTR_NESTED }, 333 [OVS_KEY_ATTR_PRIORITY] = { .len = sizeof(u32) }, 334 [OVS_KEY_ATTR_IN_PORT] = { .len = sizeof(u32) }, 335 [OVS_KEY_ATTR_SKB_MARK] = { .len = sizeof(u32) }, 336 [OVS_KEY_ATTR_ETHERNET] = { .len = sizeof(struct ovs_key_ethernet) }, 337 [OVS_KEY_ATTR_VLAN] = { .len = sizeof(__be16) }, 338 [OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) }, 339 [OVS_KEY_ATTR_IPV4] = { .len = sizeof(struct ovs_key_ipv4) }, 340 [OVS_KEY_ATTR_IPV6] = { .len = sizeof(struct ovs_key_ipv6) }, 341 [OVS_KEY_ATTR_TCP] = { .len = sizeof(struct ovs_key_tcp) }, 342 [OVS_KEY_ATTR_TCP_FLAGS] = { .len = sizeof(__be16) }, 343 [OVS_KEY_ATTR_UDP] = { .len = sizeof(struct ovs_key_udp) }, 344 [OVS_KEY_ATTR_SCTP] = { .len = sizeof(struct ovs_key_sctp) }, 345 [OVS_KEY_ATTR_ICMP] = { .len = sizeof(struct ovs_key_icmp) }, 346 [OVS_KEY_ATTR_ICMPV6] = { .len = sizeof(struct ovs_key_icmpv6) }, 347 [OVS_KEY_ATTR_ARP] = { .len = sizeof(struct ovs_key_arp) }, 348 [OVS_KEY_ATTR_ND] = { .len = sizeof(struct ovs_key_nd) }, 349 [OVS_KEY_ATTR_RECIRC_ID] = { .len = sizeof(u32) }, 350 [OVS_KEY_ATTR_DP_HASH] = { .len = sizeof(u32) }, 351 [OVS_KEY_ATTR_TUNNEL] = { .len = OVS_ATTR_NESTED, 352 .next = ovs_tunnel_key_lens, }, 353 [OVS_KEY_ATTR_MPLS] = { .len = sizeof(struct ovs_key_mpls) }, 354 [OVS_KEY_ATTR_CT_STATE] = { .len = sizeof(u8) }, 355 [OVS_KEY_ATTR_CT_ZONE] = { .len = sizeof(u16) }, 356 [OVS_KEY_ATTR_CT_MARK] = { .len = sizeof(u32) }, 357 [OVS_KEY_ATTR_CT_LABEL] = { .len = sizeof(struct ovs_key_ct_label) }, 358 }; 359 360 static bool check_attr_len(unsigned int attr_len, unsigned int expected_len) 361 { 362 return expected_len == attr_len || 363 expected_len == OVS_ATTR_NESTED || 364 expected_len == OVS_ATTR_VARIABLE; 365 } 366 367 static bool is_all_zero(const u8 *fp, size_t size) 368 { 369 int i; 370 371 if (!fp) 372 return false; 373 374 for (i = 0; i < size; i++) 375 if (fp[i]) 376 return false; 377 378 return true; 379 } 380 381 static int __parse_flow_nlattrs(const struct nlattr *attr, 382 const struct nlattr *a[], 383 u64 *attrsp, bool log, bool nz) 384 { 385 const struct nlattr *nla; 386 u64 attrs; 387 int rem; 388 389 attrs = *attrsp; 390 nla_for_each_nested(nla, attr, rem) { 391 u16 type = nla_type(nla); 392 int expected_len; 393 394 if (type > OVS_KEY_ATTR_MAX) { 395 OVS_NLERR(log, "Key type %d is out of range max %d", 396 type, OVS_KEY_ATTR_MAX); 397 return -EINVAL; 398 } 399 400 if (attrs & (1 << type)) { 401 OVS_NLERR(log, "Duplicate key (type %d).", type); 402 return -EINVAL; 403 } 404 405 expected_len = ovs_key_lens[type].len; 406 if (!check_attr_len(nla_len(nla), expected_len)) { 407 OVS_NLERR(log, "Key %d has unexpected len %d expected %d", 408 type, nla_len(nla), expected_len); 409 return -EINVAL; 410 } 411 412 if (!nz || !is_all_zero(nla_data(nla), expected_len)) { 413 attrs |= 1 << type; 414 a[type] = nla; 415 } 416 } 417 if (rem) { 418 OVS_NLERR(log, "Message has %d unknown bytes.", rem); 419 return -EINVAL; 420 } 421 422 *attrsp = attrs; 423 return 0; 424 } 425 426 static int parse_flow_mask_nlattrs(const struct nlattr *attr, 427 const struct nlattr *a[], u64 *attrsp, 428 bool log) 429 { 430 return __parse_flow_nlattrs(attr, a, attrsp, log, true); 431 } 432 433 static int parse_flow_nlattrs(const struct nlattr *attr, 434 const struct nlattr *a[], u64 *attrsp, 435 bool log) 436 { 437 return __parse_flow_nlattrs(attr, a, attrsp, log, false); 438 } 439 440 static int genev_tun_opt_from_nlattr(const struct nlattr *a, 441 struct sw_flow_match *match, bool is_mask, 442 bool log) 443 { 444 unsigned long opt_key_offset; 445 446 if (nla_len(a) > sizeof(match->key->tun_opts)) { 447 OVS_NLERR(log, "Geneve option length err (len %d, max %zu).", 448 nla_len(a), sizeof(match->key->tun_opts)); 449 return -EINVAL; 450 } 451 452 if (nla_len(a) % 4 != 0) { 453 OVS_NLERR(log, "Geneve opt len %d is not a multiple of 4.", 454 nla_len(a)); 455 return -EINVAL; 456 } 457 458 /* We need to record the length of the options passed 459 * down, otherwise packets with the same format but 460 * additional options will be silently matched. 461 */ 462 if (!is_mask) { 463 SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a), 464 false); 465 } else { 466 /* This is somewhat unusual because it looks at 467 * both the key and mask while parsing the 468 * attributes (and by extension assumes the key 469 * is parsed first). Normally, we would verify 470 * that each is the correct length and that the 471 * attributes line up in the validate function. 472 * However, that is difficult because this is 473 * variable length and we won't have the 474 * information later. 475 */ 476 if (match->key->tun_opts_len != nla_len(a)) { 477 OVS_NLERR(log, "Geneve option len %d != mask len %d", 478 match->key->tun_opts_len, nla_len(a)); 479 return -EINVAL; 480 } 481 482 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true); 483 } 484 485 opt_key_offset = TUN_METADATA_OFFSET(nla_len(a)); 486 SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a), 487 nla_len(a), is_mask); 488 return 0; 489 } 490 491 static int vxlan_tun_opt_from_nlattr(const struct nlattr *attr, 492 struct sw_flow_match *match, bool is_mask, 493 bool log) 494 { 495 struct nlattr *a; 496 int rem; 497 unsigned long opt_key_offset; 498 struct vxlan_metadata opts; 499 500 BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts)); 501 502 memset(&opts, 0, sizeof(opts)); 503 nla_for_each_nested(a, attr, rem) { 504 int type = nla_type(a); 505 506 if (type > OVS_VXLAN_EXT_MAX) { 507 OVS_NLERR(log, "VXLAN extension %d out of range max %d", 508 type, OVS_VXLAN_EXT_MAX); 509 return -EINVAL; 510 } 511 512 if (!check_attr_len(nla_len(a), 513 ovs_vxlan_ext_key_lens[type].len)) { 514 OVS_NLERR(log, "VXLAN extension %d has unexpected len %d expected %d", 515 type, nla_len(a), 516 ovs_vxlan_ext_key_lens[type].len); 517 return -EINVAL; 518 } 519 520 switch (type) { 521 case OVS_VXLAN_EXT_GBP: 522 opts.gbp = nla_get_u32(a); 523 break; 524 default: 525 OVS_NLERR(log, "Unknown VXLAN extension attribute %d", 526 type); 527 return -EINVAL; 528 } 529 } 530 if (rem) { 531 OVS_NLERR(log, "VXLAN extension message has %d unknown bytes.", 532 rem); 533 return -EINVAL; 534 } 535 536 if (!is_mask) 537 SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), false); 538 else 539 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true); 540 541 opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts)); 542 SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts), 543 is_mask); 544 return 0; 545 } 546 547 static int ip_tun_from_nlattr(const struct nlattr *attr, 548 struct sw_flow_match *match, bool is_mask, 549 bool log) 550 { 551 struct nlattr *a; 552 int rem; 553 bool ttl = false; 554 __be16 tun_flags = 0, ipv4 = false, ipv6 = false; 555 int opts_type = 0; 556 557 nla_for_each_nested(a, attr, rem) { 558 int type = nla_type(a); 559 int err; 560 561 if (type > OVS_TUNNEL_KEY_ATTR_MAX) { 562 OVS_NLERR(log, "Tunnel attr %d out of range max %d", 563 type, OVS_TUNNEL_KEY_ATTR_MAX); 564 return -EINVAL; 565 } 566 567 if (!check_attr_len(nla_len(a), 568 ovs_tunnel_key_lens[type].len)) { 569 OVS_NLERR(log, "Tunnel attr %d has unexpected len %d expected %d", 570 type, nla_len(a), ovs_tunnel_key_lens[type].len); 571 return -EINVAL; 572 } 573 574 switch (type) { 575 case OVS_TUNNEL_KEY_ATTR_ID: 576 SW_FLOW_KEY_PUT(match, tun_key.tun_id, 577 nla_get_be64(a), is_mask); 578 tun_flags |= TUNNEL_KEY; 579 break; 580 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC: 581 SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.src, 582 nla_get_in_addr(a), is_mask); 583 ipv4 = true; 584 break; 585 case OVS_TUNNEL_KEY_ATTR_IPV4_DST: 586 SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.dst, 587 nla_get_in_addr(a), is_mask); 588 ipv4 = true; 589 break; 590 case OVS_TUNNEL_KEY_ATTR_IPV6_SRC: 591 SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.dst, 592 nla_get_in6_addr(a), is_mask); 593 ipv6 = true; 594 break; 595 case OVS_TUNNEL_KEY_ATTR_IPV6_DST: 596 SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.dst, 597 nla_get_in6_addr(a), is_mask); 598 ipv6 = true; 599 break; 600 case OVS_TUNNEL_KEY_ATTR_TOS: 601 SW_FLOW_KEY_PUT(match, tun_key.tos, 602 nla_get_u8(a), is_mask); 603 break; 604 case OVS_TUNNEL_KEY_ATTR_TTL: 605 SW_FLOW_KEY_PUT(match, tun_key.ttl, 606 nla_get_u8(a), is_mask); 607 ttl = true; 608 break; 609 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT: 610 tun_flags |= TUNNEL_DONT_FRAGMENT; 611 break; 612 case OVS_TUNNEL_KEY_ATTR_CSUM: 613 tun_flags |= TUNNEL_CSUM; 614 break; 615 case OVS_TUNNEL_KEY_ATTR_TP_SRC: 616 SW_FLOW_KEY_PUT(match, tun_key.tp_src, 617 nla_get_be16(a), is_mask); 618 break; 619 case OVS_TUNNEL_KEY_ATTR_TP_DST: 620 SW_FLOW_KEY_PUT(match, tun_key.tp_dst, 621 nla_get_be16(a), is_mask); 622 break; 623 case OVS_TUNNEL_KEY_ATTR_OAM: 624 tun_flags |= TUNNEL_OAM; 625 break; 626 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS: 627 if (opts_type) { 628 OVS_NLERR(log, "Multiple metadata blocks provided"); 629 return -EINVAL; 630 } 631 632 err = genev_tun_opt_from_nlattr(a, match, is_mask, log); 633 if (err) 634 return err; 635 636 tun_flags |= TUNNEL_GENEVE_OPT; 637 opts_type = type; 638 break; 639 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS: 640 if (opts_type) { 641 OVS_NLERR(log, "Multiple metadata blocks provided"); 642 return -EINVAL; 643 } 644 645 err = vxlan_tun_opt_from_nlattr(a, match, is_mask, log); 646 if (err) 647 return err; 648 649 tun_flags |= TUNNEL_VXLAN_OPT; 650 opts_type = type; 651 break; 652 default: 653 OVS_NLERR(log, "Unknown IP tunnel attribute %d", 654 type); 655 return -EINVAL; 656 } 657 } 658 659 SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask); 660 if (is_mask) 661 SW_FLOW_KEY_MEMSET_FIELD(match, tun_proto, 0xff, true); 662 else 663 SW_FLOW_KEY_PUT(match, tun_proto, ipv6 ? AF_INET6 : AF_INET, 664 false); 665 666 if (rem > 0) { 667 OVS_NLERR(log, "IP tunnel attribute has %d unknown bytes.", 668 rem); 669 return -EINVAL; 670 } 671 672 if (ipv4 && ipv6) { 673 OVS_NLERR(log, "Mixed IPv4 and IPv6 tunnel attributes"); 674 return -EINVAL; 675 } 676 677 if (!is_mask) { 678 if (!ipv4 && !ipv6) { 679 OVS_NLERR(log, "IP tunnel dst address not specified"); 680 return -EINVAL; 681 } 682 if (ipv4 && !match->key->tun_key.u.ipv4.dst) { 683 OVS_NLERR(log, "IPv4 tunnel dst address is zero"); 684 return -EINVAL; 685 } 686 if (ipv6 && ipv6_addr_any(&match->key->tun_key.u.ipv6.dst)) { 687 OVS_NLERR(log, "IPv6 tunnel dst address is zero"); 688 return -EINVAL; 689 } 690 691 if (!ttl) { 692 OVS_NLERR(log, "IP tunnel TTL not specified."); 693 return -EINVAL; 694 } 695 } 696 697 return opts_type; 698 } 699 700 static int vxlan_opt_to_nlattr(struct sk_buff *skb, 701 const void *tun_opts, int swkey_tun_opts_len) 702 { 703 const struct vxlan_metadata *opts = tun_opts; 704 struct nlattr *nla; 705 706 nla = nla_nest_start(skb, OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS); 707 if (!nla) 708 return -EMSGSIZE; 709 710 if (nla_put_u32(skb, OVS_VXLAN_EXT_GBP, opts->gbp) < 0) 711 return -EMSGSIZE; 712 713 nla_nest_end(skb, nla); 714 return 0; 715 } 716 717 static int __ip_tun_to_nlattr(struct sk_buff *skb, 718 const struct ip_tunnel_key *output, 719 const void *tun_opts, int swkey_tun_opts_len, 720 unsigned short tun_proto) 721 { 722 if (output->tun_flags & TUNNEL_KEY && 723 nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id)) 724 return -EMSGSIZE; 725 switch (tun_proto) { 726 case AF_INET: 727 if (output->u.ipv4.src && 728 nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, 729 output->u.ipv4.src)) 730 return -EMSGSIZE; 731 if (output->u.ipv4.dst && 732 nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, 733 output->u.ipv4.dst)) 734 return -EMSGSIZE; 735 break; 736 case AF_INET6: 737 if (!ipv6_addr_any(&output->u.ipv6.src) && 738 nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_SRC, 739 &output->u.ipv6.src)) 740 return -EMSGSIZE; 741 if (!ipv6_addr_any(&output->u.ipv6.dst) && 742 nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_DST, 743 &output->u.ipv6.dst)) 744 return -EMSGSIZE; 745 break; 746 } 747 if (output->tos && 748 nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->tos)) 749 return -EMSGSIZE; 750 if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ttl)) 751 return -EMSGSIZE; 752 if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) && 753 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT)) 754 return -EMSGSIZE; 755 if ((output->tun_flags & TUNNEL_CSUM) && 756 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM)) 757 return -EMSGSIZE; 758 if (output->tp_src && 759 nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_SRC, output->tp_src)) 760 return -EMSGSIZE; 761 if (output->tp_dst && 762 nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_DST, output->tp_dst)) 763 return -EMSGSIZE; 764 if ((output->tun_flags & TUNNEL_OAM) && 765 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM)) 766 return -EMSGSIZE; 767 if (tun_opts) { 768 if (output->tun_flags & TUNNEL_GENEVE_OPT && 769 nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS, 770 swkey_tun_opts_len, tun_opts)) 771 return -EMSGSIZE; 772 else if (output->tun_flags & TUNNEL_VXLAN_OPT && 773 vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len)) 774 return -EMSGSIZE; 775 } 776 777 return 0; 778 } 779 780 static int ip_tun_to_nlattr(struct sk_buff *skb, 781 const struct ip_tunnel_key *output, 782 const void *tun_opts, int swkey_tun_opts_len, 783 unsigned short tun_proto) 784 { 785 struct nlattr *nla; 786 int err; 787 788 nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL); 789 if (!nla) 790 return -EMSGSIZE; 791 792 err = __ip_tun_to_nlattr(skb, output, tun_opts, swkey_tun_opts_len, 793 tun_proto); 794 if (err) 795 return err; 796 797 nla_nest_end(skb, nla); 798 return 0; 799 } 800 801 int ovs_nla_put_egress_tunnel_key(struct sk_buff *skb, 802 const struct ip_tunnel_info *egress_tun_info, 803 const void *egress_tun_opts) 804 { 805 return __ip_tun_to_nlattr(skb, &egress_tun_info->key, 806 egress_tun_opts, 807 egress_tun_info->options_len, 808 ip_tunnel_info_af(egress_tun_info)); 809 } 810 811 static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match, 812 u64 *attrs, const struct nlattr **a, 813 bool is_mask, bool log) 814 { 815 if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) { 816 u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]); 817 818 SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask); 819 *attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH); 820 } 821 822 if (*attrs & (1 << OVS_KEY_ATTR_RECIRC_ID)) { 823 u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]); 824 825 SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask); 826 *attrs &= ~(1 << OVS_KEY_ATTR_RECIRC_ID); 827 } 828 829 if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) { 830 SW_FLOW_KEY_PUT(match, phy.priority, 831 nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask); 832 *attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY); 833 } 834 835 if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) { 836 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]); 837 838 if (is_mask) { 839 in_port = 0xffffffff; /* Always exact match in_port. */ 840 } else if (in_port >= DP_MAX_PORTS) { 841 OVS_NLERR(log, "Port %d exceeds max allowable %d", 842 in_port, DP_MAX_PORTS); 843 return -EINVAL; 844 } 845 846 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask); 847 *attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT); 848 } else if (!is_mask) { 849 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask); 850 } 851 852 if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) { 853 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]); 854 855 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask); 856 *attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK); 857 } 858 if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) { 859 if (ip_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match, 860 is_mask, log) < 0) 861 return -EINVAL; 862 *attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL); 863 } 864 865 if (*attrs & (1 << OVS_KEY_ATTR_CT_STATE) && 866 ovs_ct_verify(net, OVS_KEY_ATTR_CT_STATE)) { 867 u8 ct_state = nla_get_u8(a[OVS_KEY_ATTR_CT_STATE]); 868 869 SW_FLOW_KEY_PUT(match, ct.state, ct_state, is_mask); 870 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_STATE); 871 } 872 if (*attrs & (1 << OVS_KEY_ATTR_CT_ZONE) && 873 ovs_ct_verify(net, OVS_KEY_ATTR_CT_ZONE)) { 874 u16 ct_zone = nla_get_u16(a[OVS_KEY_ATTR_CT_ZONE]); 875 876 SW_FLOW_KEY_PUT(match, ct.zone, ct_zone, is_mask); 877 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ZONE); 878 } 879 if (*attrs & (1 << OVS_KEY_ATTR_CT_MARK) && 880 ovs_ct_verify(net, OVS_KEY_ATTR_CT_MARK)) { 881 u32 mark = nla_get_u32(a[OVS_KEY_ATTR_CT_MARK]); 882 883 SW_FLOW_KEY_PUT(match, ct.mark, mark, is_mask); 884 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_MARK); 885 } 886 if (*attrs & (1 << OVS_KEY_ATTR_CT_LABEL) && 887 ovs_ct_verify(net, OVS_KEY_ATTR_CT_LABEL)) { 888 const struct ovs_key_ct_label *cl; 889 890 cl = nla_data(a[OVS_KEY_ATTR_CT_LABEL]); 891 SW_FLOW_KEY_MEMCPY(match, ct.label, cl->ct_label, 892 sizeof(*cl), is_mask); 893 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_LABEL); 894 } 895 return 0; 896 } 897 898 static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match, 899 u64 attrs, const struct nlattr **a, 900 bool is_mask, bool log) 901 { 902 int err; 903 904 err = metadata_from_nlattrs(net, match, &attrs, a, is_mask, log); 905 if (err) 906 return err; 907 908 if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) { 909 const struct ovs_key_ethernet *eth_key; 910 911 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]); 912 SW_FLOW_KEY_MEMCPY(match, eth.src, 913 eth_key->eth_src, ETH_ALEN, is_mask); 914 SW_FLOW_KEY_MEMCPY(match, eth.dst, 915 eth_key->eth_dst, ETH_ALEN, is_mask); 916 attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET); 917 } 918 919 if (attrs & (1 << OVS_KEY_ATTR_VLAN)) { 920 __be16 tci; 921 922 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); 923 if (!(tci & htons(VLAN_TAG_PRESENT))) { 924 if (is_mask) 925 OVS_NLERR(log, "VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit."); 926 else 927 OVS_NLERR(log, "VLAN TCI does not have VLAN_TAG_PRESENT bit set."); 928 929 return -EINVAL; 930 } 931 932 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask); 933 attrs &= ~(1 << OVS_KEY_ATTR_VLAN); 934 } 935 936 if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) { 937 __be16 eth_type; 938 939 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); 940 if (is_mask) { 941 /* Always exact match EtherType. */ 942 eth_type = htons(0xffff); 943 } else if (!eth_proto_is_802_3(eth_type)) { 944 OVS_NLERR(log, "EtherType %x is less than min %x", 945 ntohs(eth_type), ETH_P_802_3_MIN); 946 return -EINVAL; 947 } 948 949 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask); 950 attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); 951 } else if (!is_mask) { 952 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask); 953 } 954 955 if (attrs & (1 << OVS_KEY_ATTR_IPV4)) { 956 const struct ovs_key_ipv4 *ipv4_key; 957 958 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]); 959 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) { 960 OVS_NLERR(log, "IPv4 frag type %d is out of range max %d", 961 ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX); 962 return -EINVAL; 963 } 964 SW_FLOW_KEY_PUT(match, ip.proto, 965 ipv4_key->ipv4_proto, is_mask); 966 SW_FLOW_KEY_PUT(match, ip.tos, 967 ipv4_key->ipv4_tos, is_mask); 968 SW_FLOW_KEY_PUT(match, ip.ttl, 969 ipv4_key->ipv4_ttl, is_mask); 970 SW_FLOW_KEY_PUT(match, ip.frag, 971 ipv4_key->ipv4_frag, is_mask); 972 SW_FLOW_KEY_PUT(match, ipv4.addr.src, 973 ipv4_key->ipv4_src, is_mask); 974 SW_FLOW_KEY_PUT(match, ipv4.addr.dst, 975 ipv4_key->ipv4_dst, is_mask); 976 attrs &= ~(1 << OVS_KEY_ATTR_IPV4); 977 } 978 979 if (attrs & (1 << OVS_KEY_ATTR_IPV6)) { 980 const struct ovs_key_ipv6 *ipv6_key; 981 982 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]); 983 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) { 984 OVS_NLERR(log, "IPv6 frag type %d is out of range max %d", 985 ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX); 986 return -EINVAL; 987 } 988 989 if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) { 990 OVS_NLERR(log, "IPv6 flow label %x is out of range (max=%x).\n", 991 ntohl(ipv6_key->ipv6_label), (1 << 20) - 1); 992 return -EINVAL; 993 } 994 995 SW_FLOW_KEY_PUT(match, ipv6.label, 996 ipv6_key->ipv6_label, is_mask); 997 SW_FLOW_KEY_PUT(match, ip.proto, 998 ipv6_key->ipv6_proto, is_mask); 999 SW_FLOW_KEY_PUT(match, ip.tos, 1000 ipv6_key->ipv6_tclass, is_mask); 1001 SW_FLOW_KEY_PUT(match, ip.ttl, 1002 ipv6_key->ipv6_hlimit, is_mask); 1003 SW_FLOW_KEY_PUT(match, ip.frag, 1004 ipv6_key->ipv6_frag, is_mask); 1005 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src, 1006 ipv6_key->ipv6_src, 1007 sizeof(match->key->ipv6.addr.src), 1008 is_mask); 1009 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst, 1010 ipv6_key->ipv6_dst, 1011 sizeof(match->key->ipv6.addr.dst), 1012 is_mask); 1013 1014 attrs &= ~(1 << OVS_KEY_ATTR_IPV6); 1015 } 1016 1017 if (attrs & (1 << OVS_KEY_ATTR_ARP)) { 1018 const struct ovs_key_arp *arp_key; 1019 1020 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]); 1021 if (!is_mask && (arp_key->arp_op & htons(0xff00))) { 1022 OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).", 1023 arp_key->arp_op); 1024 return -EINVAL; 1025 } 1026 1027 SW_FLOW_KEY_PUT(match, ipv4.addr.src, 1028 arp_key->arp_sip, is_mask); 1029 SW_FLOW_KEY_PUT(match, ipv4.addr.dst, 1030 arp_key->arp_tip, is_mask); 1031 SW_FLOW_KEY_PUT(match, ip.proto, 1032 ntohs(arp_key->arp_op), is_mask); 1033 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha, 1034 arp_key->arp_sha, ETH_ALEN, is_mask); 1035 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha, 1036 arp_key->arp_tha, ETH_ALEN, is_mask); 1037 1038 attrs &= ~(1 << OVS_KEY_ATTR_ARP); 1039 } 1040 1041 if (attrs & (1 << OVS_KEY_ATTR_MPLS)) { 1042 const struct ovs_key_mpls *mpls_key; 1043 1044 mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]); 1045 SW_FLOW_KEY_PUT(match, mpls.top_lse, 1046 mpls_key->mpls_lse, is_mask); 1047 1048 attrs &= ~(1 << OVS_KEY_ATTR_MPLS); 1049 } 1050 1051 if (attrs & (1 << OVS_KEY_ATTR_TCP)) { 1052 const struct ovs_key_tcp *tcp_key; 1053 1054 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); 1055 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask); 1056 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask); 1057 attrs &= ~(1 << OVS_KEY_ATTR_TCP); 1058 } 1059 1060 if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) { 1061 SW_FLOW_KEY_PUT(match, tp.flags, 1062 nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]), 1063 is_mask); 1064 attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS); 1065 } 1066 1067 if (attrs & (1 << OVS_KEY_ATTR_UDP)) { 1068 const struct ovs_key_udp *udp_key; 1069 1070 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); 1071 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask); 1072 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask); 1073 attrs &= ~(1 << OVS_KEY_ATTR_UDP); 1074 } 1075 1076 if (attrs & (1 << OVS_KEY_ATTR_SCTP)) { 1077 const struct ovs_key_sctp *sctp_key; 1078 1079 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]); 1080 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask); 1081 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask); 1082 attrs &= ~(1 << OVS_KEY_ATTR_SCTP); 1083 } 1084 1085 if (attrs & (1 << OVS_KEY_ATTR_ICMP)) { 1086 const struct ovs_key_icmp *icmp_key; 1087 1088 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]); 1089 SW_FLOW_KEY_PUT(match, tp.src, 1090 htons(icmp_key->icmp_type), is_mask); 1091 SW_FLOW_KEY_PUT(match, tp.dst, 1092 htons(icmp_key->icmp_code), is_mask); 1093 attrs &= ~(1 << OVS_KEY_ATTR_ICMP); 1094 } 1095 1096 if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) { 1097 const struct ovs_key_icmpv6 *icmpv6_key; 1098 1099 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]); 1100 SW_FLOW_KEY_PUT(match, tp.src, 1101 htons(icmpv6_key->icmpv6_type), is_mask); 1102 SW_FLOW_KEY_PUT(match, tp.dst, 1103 htons(icmpv6_key->icmpv6_code), is_mask); 1104 attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6); 1105 } 1106 1107 if (attrs & (1 << OVS_KEY_ATTR_ND)) { 1108 const struct ovs_key_nd *nd_key; 1109 1110 nd_key = nla_data(a[OVS_KEY_ATTR_ND]); 1111 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target, 1112 nd_key->nd_target, 1113 sizeof(match->key->ipv6.nd.target), 1114 is_mask); 1115 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll, 1116 nd_key->nd_sll, ETH_ALEN, is_mask); 1117 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll, 1118 nd_key->nd_tll, ETH_ALEN, is_mask); 1119 attrs &= ~(1 << OVS_KEY_ATTR_ND); 1120 } 1121 1122 if (attrs != 0) { 1123 OVS_NLERR(log, "Unknown key attributes %llx", 1124 (unsigned long long)attrs); 1125 return -EINVAL; 1126 } 1127 1128 return 0; 1129 } 1130 1131 static void nlattr_set(struct nlattr *attr, u8 val, 1132 const struct ovs_len_tbl *tbl) 1133 { 1134 struct nlattr *nla; 1135 int rem; 1136 1137 /* The nlattr stream should already have been validated */ 1138 nla_for_each_nested(nla, attr, rem) { 1139 if (tbl[nla_type(nla)].len == OVS_ATTR_NESTED) { 1140 if (tbl[nla_type(nla)].next) 1141 tbl = tbl[nla_type(nla)].next; 1142 nlattr_set(nla, val, tbl); 1143 } else { 1144 memset(nla_data(nla), val, nla_len(nla)); 1145 } 1146 } 1147 } 1148 1149 static void mask_set_nlattr(struct nlattr *attr, u8 val) 1150 { 1151 nlattr_set(attr, val, ovs_key_lens); 1152 } 1153 1154 /** 1155 * ovs_nla_get_match - parses Netlink attributes into a flow key and 1156 * mask. In case the 'mask' is NULL, the flow is treated as exact match 1157 * flow. Otherwise, it is treated as a wildcarded flow, except the mask 1158 * does not include any don't care bit. 1159 * @net: Used to determine per-namespace field support. 1160 * @match: receives the extracted flow match information. 1161 * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute 1162 * sequence. The fields should of the packet that triggered the creation 1163 * of this flow. 1164 * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink 1165 * attribute specifies the mask field of the wildcarded flow. 1166 * @log: Boolean to allow kernel error logging. Normally true, but when 1167 * probing for feature compatibility this should be passed in as false to 1168 * suppress unnecessary error logging. 1169 */ 1170 int ovs_nla_get_match(struct net *net, struct sw_flow_match *match, 1171 const struct nlattr *nla_key, 1172 const struct nlattr *nla_mask, 1173 bool log) 1174 { 1175 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; 1176 const struct nlattr *encap; 1177 struct nlattr *newmask = NULL; 1178 u64 key_attrs = 0; 1179 u64 mask_attrs = 0; 1180 bool encap_valid = false; 1181 int err; 1182 1183 err = parse_flow_nlattrs(nla_key, a, &key_attrs, log); 1184 if (err) 1185 return err; 1186 1187 if ((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) && 1188 (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) && 1189 (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) { 1190 __be16 tci; 1191 1192 if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) && 1193 (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) { 1194 OVS_NLERR(log, "Invalid Vlan frame."); 1195 return -EINVAL; 1196 } 1197 1198 key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); 1199 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); 1200 encap = a[OVS_KEY_ATTR_ENCAP]; 1201 key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP); 1202 encap_valid = true; 1203 1204 if (tci & htons(VLAN_TAG_PRESENT)) { 1205 err = parse_flow_nlattrs(encap, a, &key_attrs, log); 1206 if (err) 1207 return err; 1208 } else if (!tci) { 1209 /* Corner case for truncated 802.1Q header. */ 1210 if (nla_len(encap)) { 1211 OVS_NLERR(log, "Truncated 802.1Q header has non-zero encap attribute."); 1212 return -EINVAL; 1213 } 1214 } else { 1215 OVS_NLERR(log, "Encap attr is set for non-VLAN frame"); 1216 return -EINVAL; 1217 } 1218 } 1219 1220 err = ovs_key_from_nlattrs(net, match, key_attrs, a, false, log); 1221 if (err) 1222 return err; 1223 1224 if (match->mask) { 1225 if (!nla_mask) { 1226 /* Create an exact match mask. We need to set to 0xff 1227 * all the 'match->mask' fields that have been touched 1228 * in 'match->key'. We cannot simply memset 1229 * 'match->mask', because padding bytes and fields not 1230 * specified in 'match->key' should be left to 0. 1231 * Instead, we use a stream of netlink attributes, 1232 * copied from 'key' and set to 0xff. 1233 * ovs_key_from_nlattrs() will take care of filling 1234 * 'match->mask' appropriately. 1235 */ 1236 newmask = kmemdup(nla_key, 1237 nla_total_size(nla_len(nla_key)), 1238 GFP_KERNEL); 1239 if (!newmask) 1240 return -ENOMEM; 1241 1242 mask_set_nlattr(newmask, 0xff); 1243 1244 /* The userspace does not send tunnel attributes that 1245 * are 0, but we should not wildcard them nonetheless. 1246 */ 1247 if (match->key->tun_proto) 1248 SW_FLOW_KEY_MEMSET_FIELD(match, tun_key, 1249 0xff, true); 1250 1251 nla_mask = newmask; 1252 } 1253 1254 err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log); 1255 if (err) 1256 goto free_newmask; 1257 1258 /* Always match on tci. */ 1259 SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true); 1260 1261 if (mask_attrs & 1 << OVS_KEY_ATTR_ENCAP) { 1262 __be16 eth_type = 0; 1263 __be16 tci = 0; 1264 1265 if (!encap_valid) { 1266 OVS_NLERR(log, "Encap mask attribute is set for non-VLAN frame."); 1267 err = -EINVAL; 1268 goto free_newmask; 1269 } 1270 1271 mask_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP); 1272 if (a[OVS_KEY_ATTR_ETHERTYPE]) 1273 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); 1274 1275 if (eth_type == htons(0xffff)) { 1276 mask_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); 1277 encap = a[OVS_KEY_ATTR_ENCAP]; 1278 err = parse_flow_mask_nlattrs(encap, a, 1279 &mask_attrs, log); 1280 if (err) 1281 goto free_newmask; 1282 } else { 1283 OVS_NLERR(log, "VLAN frames must have an exact match on the TPID (mask=%x).", 1284 ntohs(eth_type)); 1285 err = -EINVAL; 1286 goto free_newmask; 1287 } 1288 1289 if (a[OVS_KEY_ATTR_VLAN]) 1290 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); 1291 1292 if (!(tci & htons(VLAN_TAG_PRESENT))) { 1293 OVS_NLERR(log, "VLAN tag present bit must have an exact match (tci_mask=%x).", 1294 ntohs(tci)); 1295 err = -EINVAL; 1296 goto free_newmask; 1297 } 1298 } 1299 1300 err = ovs_key_from_nlattrs(net, match, mask_attrs, a, true, 1301 log); 1302 if (err) 1303 goto free_newmask; 1304 } 1305 1306 if (!match_validate(match, key_attrs, mask_attrs, log)) 1307 err = -EINVAL; 1308 1309 free_newmask: 1310 kfree(newmask); 1311 return err; 1312 } 1313 1314 static size_t get_ufid_len(const struct nlattr *attr, bool log) 1315 { 1316 size_t len; 1317 1318 if (!attr) 1319 return 0; 1320 1321 len = nla_len(attr); 1322 if (len < 1 || len > MAX_UFID_LENGTH) { 1323 OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)", 1324 nla_len(attr), MAX_UFID_LENGTH); 1325 return 0; 1326 } 1327 1328 return len; 1329 } 1330 1331 /* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID, 1332 * or false otherwise. 1333 */ 1334 bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr, 1335 bool log) 1336 { 1337 sfid->ufid_len = get_ufid_len(attr, log); 1338 if (sfid->ufid_len) 1339 memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len); 1340 1341 return sfid->ufid_len; 1342 } 1343 1344 int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid, 1345 const struct sw_flow_key *key, bool log) 1346 { 1347 struct sw_flow_key *new_key; 1348 1349 if (ovs_nla_get_ufid(sfid, ufid, log)) 1350 return 0; 1351 1352 /* If UFID was not provided, use unmasked key. */ 1353 new_key = kmalloc(sizeof(*new_key), GFP_KERNEL); 1354 if (!new_key) 1355 return -ENOMEM; 1356 memcpy(new_key, key, sizeof(*key)); 1357 sfid->unmasked_key = new_key; 1358 1359 return 0; 1360 } 1361 1362 u32 ovs_nla_get_ufid_flags(const struct nlattr *attr) 1363 { 1364 return attr ? nla_get_u32(attr) : 0; 1365 } 1366 1367 /** 1368 * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key. 1369 * @key: Receives extracted in_port, priority, tun_key and skb_mark. 1370 * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute 1371 * sequence. 1372 * @log: Boolean to allow kernel error logging. Normally true, but when 1373 * probing for feature compatibility this should be passed in as false to 1374 * suppress unnecessary error logging. 1375 * 1376 * This parses a series of Netlink attributes that form a flow key, which must 1377 * take the same form accepted by flow_from_nlattrs(), but only enough of it to 1378 * get the metadata, that is, the parts of the flow key that cannot be 1379 * extracted from the packet itself. 1380 */ 1381 1382 int ovs_nla_get_flow_metadata(struct net *net, const struct nlattr *attr, 1383 struct sw_flow_key *key, 1384 bool log) 1385 { 1386 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; 1387 struct sw_flow_match match; 1388 u64 attrs = 0; 1389 int err; 1390 1391 err = parse_flow_nlattrs(attr, a, &attrs, log); 1392 if (err) 1393 return -EINVAL; 1394 1395 memset(&match, 0, sizeof(match)); 1396 match.key = key; 1397 1398 memset(&key->ct, 0, sizeof(key->ct)); 1399 key->phy.in_port = DP_MAX_PORTS; 1400 1401 return metadata_from_nlattrs(net, &match, &attrs, a, false, log); 1402 } 1403 1404 static int __ovs_nla_put_key(const struct sw_flow_key *swkey, 1405 const struct sw_flow_key *output, bool is_mask, 1406 struct sk_buff *skb) 1407 { 1408 struct ovs_key_ethernet *eth_key; 1409 struct nlattr *nla, *encap; 1410 1411 if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id)) 1412 goto nla_put_failure; 1413 1414 if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash)) 1415 goto nla_put_failure; 1416 1417 if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority)) 1418 goto nla_put_failure; 1419 1420 if ((swkey->tun_proto || is_mask)) { 1421 const void *opts = NULL; 1422 1423 if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT) 1424 opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len); 1425 1426 if (ip_tun_to_nlattr(skb, &output->tun_key, opts, 1427 swkey->tun_opts_len, swkey->tun_proto)) 1428 goto nla_put_failure; 1429 } 1430 1431 if (swkey->phy.in_port == DP_MAX_PORTS) { 1432 if (is_mask && (output->phy.in_port == 0xffff)) 1433 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff)) 1434 goto nla_put_failure; 1435 } else { 1436 u16 upper_u16; 1437 upper_u16 = !is_mask ? 0 : 0xffff; 1438 1439 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 1440 (upper_u16 << 16) | output->phy.in_port)) 1441 goto nla_put_failure; 1442 } 1443 1444 if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark)) 1445 goto nla_put_failure; 1446 1447 if (ovs_ct_put_key(output, skb)) 1448 goto nla_put_failure; 1449 1450 nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key)); 1451 if (!nla) 1452 goto nla_put_failure; 1453 1454 eth_key = nla_data(nla); 1455 ether_addr_copy(eth_key->eth_src, output->eth.src); 1456 ether_addr_copy(eth_key->eth_dst, output->eth.dst); 1457 1458 if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) { 1459 __be16 eth_type; 1460 eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff); 1461 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) || 1462 nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci)) 1463 goto nla_put_failure; 1464 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP); 1465 if (!swkey->eth.tci) 1466 goto unencap; 1467 } else 1468 encap = NULL; 1469 1470 if (swkey->eth.type == htons(ETH_P_802_2)) { 1471 /* 1472 * Ethertype 802.2 is represented in the netlink with omitted 1473 * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and 1474 * 0xffff in the mask attribute. Ethertype can also 1475 * be wildcarded. 1476 */ 1477 if (is_mask && output->eth.type) 1478 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, 1479 output->eth.type)) 1480 goto nla_put_failure; 1481 goto unencap; 1482 } 1483 1484 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type)) 1485 goto nla_put_failure; 1486 1487 if (swkey->eth.type == htons(ETH_P_IP)) { 1488 struct ovs_key_ipv4 *ipv4_key; 1489 1490 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key)); 1491 if (!nla) 1492 goto nla_put_failure; 1493 ipv4_key = nla_data(nla); 1494 ipv4_key->ipv4_src = output->ipv4.addr.src; 1495 ipv4_key->ipv4_dst = output->ipv4.addr.dst; 1496 ipv4_key->ipv4_proto = output->ip.proto; 1497 ipv4_key->ipv4_tos = output->ip.tos; 1498 ipv4_key->ipv4_ttl = output->ip.ttl; 1499 ipv4_key->ipv4_frag = output->ip.frag; 1500 } else if (swkey->eth.type == htons(ETH_P_IPV6)) { 1501 struct ovs_key_ipv6 *ipv6_key; 1502 1503 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key)); 1504 if (!nla) 1505 goto nla_put_failure; 1506 ipv6_key = nla_data(nla); 1507 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src, 1508 sizeof(ipv6_key->ipv6_src)); 1509 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst, 1510 sizeof(ipv6_key->ipv6_dst)); 1511 ipv6_key->ipv6_label = output->ipv6.label; 1512 ipv6_key->ipv6_proto = output->ip.proto; 1513 ipv6_key->ipv6_tclass = output->ip.tos; 1514 ipv6_key->ipv6_hlimit = output->ip.ttl; 1515 ipv6_key->ipv6_frag = output->ip.frag; 1516 } else if (swkey->eth.type == htons(ETH_P_ARP) || 1517 swkey->eth.type == htons(ETH_P_RARP)) { 1518 struct ovs_key_arp *arp_key; 1519 1520 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key)); 1521 if (!nla) 1522 goto nla_put_failure; 1523 arp_key = nla_data(nla); 1524 memset(arp_key, 0, sizeof(struct ovs_key_arp)); 1525 arp_key->arp_sip = output->ipv4.addr.src; 1526 arp_key->arp_tip = output->ipv4.addr.dst; 1527 arp_key->arp_op = htons(output->ip.proto); 1528 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha); 1529 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha); 1530 } else if (eth_p_mpls(swkey->eth.type)) { 1531 struct ovs_key_mpls *mpls_key; 1532 1533 nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS, sizeof(*mpls_key)); 1534 if (!nla) 1535 goto nla_put_failure; 1536 mpls_key = nla_data(nla); 1537 mpls_key->mpls_lse = output->mpls.top_lse; 1538 } 1539 1540 if ((swkey->eth.type == htons(ETH_P_IP) || 1541 swkey->eth.type == htons(ETH_P_IPV6)) && 1542 swkey->ip.frag != OVS_FRAG_TYPE_LATER) { 1543 1544 if (swkey->ip.proto == IPPROTO_TCP) { 1545 struct ovs_key_tcp *tcp_key; 1546 1547 nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key)); 1548 if (!nla) 1549 goto nla_put_failure; 1550 tcp_key = nla_data(nla); 1551 tcp_key->tcp_src = output->tp.src; 1552 tcp_key->tcp_dst = output->tp.dst; 1553 if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS, 1554 output->tp.flags)) 1555 goto nla_put_failure; 1556 } else if (swkey->ip.proto == IPPROTO_UDP) { 1557 struct ovs_key_udp *udp_key; 1558 1559 nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key)); 1560 if (!nla) 1561 goto nla_put_failure; 1562 udp_key = nla_data(nla); 1563 udp_key->udp_src = output->tp.src; 1564 udp_key->udp_dst = output->tp.dst; 1565 } else if (swkey->ip.proto == IPPROTO_SCTP) { 1566 struct ovs_key_sctp *sctp_key; 1567 1568 nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key)); 1569 if (!nla) 1570 goto nla_put_failure; 1571 sctp_key = nla_data(nla); 1572 sctp_key->sctp_src = output->tp.src; 1573 sctp_key->sctp_dst = output->tp.dst; 1574 } else if (swkey->eth.type == htons(ETH_P_IP) && 1575 swkey->ip.proto == IPPROTO_ICMP) { 1576 struct ovs_key_icmp *icmp_key; 1577 1578 nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key)); 1579 if (!nla) 1580 goto nla_put_failure; 1581 icmp_key = nla_data(nla); 1582 icmp_key->icmp_type = ntohs(output->tp.src); 1583 icmp_key->icmp_code = ntohs(output->tp.dst); 1584 } else if (swkey->eth.type == htons(ETH_P_IPV6) && 1585 swkey->ip.proto == IPPROTO_ICMPV6) { 1586 struct ovs_key_icmpv6 *icmpv6_key; 1587 1588 nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6, 1589 sizeof(*icmpv6_key)); 1590 if (!nla) 1591 goto nla_put_failure; 1592 icmpv6_key = nla_data(nla); 1593 icmpv6_key->icmpv6_type = ntohs(output->tp.src); 1594 icmpv6_key->icmpv6_code = ntohs(output->tp.dst); 1595 1596 if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION || 1597 icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) { 1598 struct ovs_key_nd *nd_key; 1599 1600 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key)); 1601 if (!nla) 1602 goto nla_put_failure; 1603 nd_key = nla_data(nla); 1604 memcpy(nd_key->nd_target, &output->ipv6.nd.target, 1605 sizeof(nd_key->nd_target)); 1606 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll); 1607 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll); 1608 } 1609 } 1610 } 1611 1612 unencap: 1613 if (encap) 1614 nla_nest_end(skb, encap); 1615 1616 return 0; 1617 1618 nla_put_failure: 1619 return -EMSGSIZE; 1620 } 1621 1622 int ovs_nla_put_key(const struct sw_flow_key *swkey, 1623 const struct sw_flow_key *output, int attr, bool is_mask, 1624 struct sk_buff *skb) 1625 { 1626 int err; 1627 struct nlattr *nla; 1628 1629 nla = nla_nest_start(skb, attr); 1630 if (!nla) 1631 return -EMSGSIZE; 1632 err = __ovs_nla_put_key(swkey, output, is_mask, skb); 1633 if (err) 1634 return err; 1635 nla_nest_end(skb, nla); 1636 1637 return 0; 1638 } 1639 1640 /* Called with ovs_mutex or RCU read lock. */ 1641 int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb) 1642 { 1643 if (ovs_identifier_is_ufid(&flow->id)) 1644 return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len, 1645 flow->id.ufid); 1646 1647 return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key, 1648 OVS_FLOW_ATTR_KEY, false, skb); 1649 } 1650 1651 /* Called with ovs_mutex or RCU read lock. */ 1652 int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb) 1653 { 1654 return ovs_nla_put_key(&flow->key, &flow->key, 1655 OVS_FLOW_ATTR_KEY, false, skb); 1656 } 1657 1658 /* Called with ovs_mutex or RCU read lock. */ 1659 int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb) 1660 { 1661 return ovs_nla_put_key(&flow->key, &flow->mask->key, 1662 OVS_FLOW_ATTR_MASK, true, skb); 1663 } 1664 1665 #define MAX_ACTIONS_BUFSIZE (32 * 1024) 1666 1667 static struct sw_flow_actions *nla_alloc_flow_actions(int size, bool log) 1668 { 1669 struct sw_flow_actions *sfa; 1670 1671 if (size > MAX_ACTIONS_BUFSIZE) { 1672 OVS_NLERR(log, "Flow action size %u bytes exceeds max", size); 1673 return ERR_PTR(-EINVAL); 1674 } 1675 1676 sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL); 1677 if (!sfa) 1678 return ERR_PTR(-ENOMEM); 1679 1680 sfa->actions_len = 0; 1681 return sfa; 1682 } 1683 1684 static void ovs_nla_free_set_action(const struct nlattr *a) 1685 { 1686 const struct nlattr *ovs_key = nla_data(a); 1687 struct ovs_tunnel_info *ovs_tun; 1688 1689 switch (nla_type(ovs_key)) { 1690 case OVS_KEY_ATTR_TUNNEL_INFO: 1691 ovs_tun = nla_data(ovs_key); 1692 dst_release((struct dst_entry *)ovs_tun->tun_dst); 1693 break; 1694 } 1695 } 1696 1697 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts) 1698 { 1699 const struct nlattr *a; 1700 int rem; 1701 1702 if (!sf_acts) 1703 return; 1704 1705 nla_for_each_attr(a, sf_acts->actions, sf_acts->actions_len, rem) { 1706 switch (nla_type(a)) { 1707 case OVS_ACTION_ATTR_SET: 1708 ovs_nla_free_set_action(a); 1709 break; 1710 case OVS_ACTION_ATTR_CT: 1711 ovs_ct_free_action(a); 1712 break; 1713 } 1714 } 1715 1716 kfree(sf_acts); 1717 } 1718 1719 static void __ovs_nla_free_flow_actions(struct rcu_head *head) 1720 { 1721 ovs_nla_free_flow_actions(container_of(head, struct sw_flow_actions, rcu)); 1722 } 1723 1724 /* Schedules 'sf_acts' to be freed after the next RCU grace period. 1725 * The caller must hold rcu_read_lock for this to be sensible. */ 1726 void ovs_nla_free_flow_actions_rcu(struct sw_flow_actions *sf_acts) 1727 { 1728 call_rcu(&sf_acts->rcu, __ovs_nla_free_flow_actions); 1729 } 1730 1731 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, 1732 int attr_len, bool log) 1733 { 1734 1735 struct sw_flow_actions *acts; 1736 int new_acts_size; 1737 int req_size = NLA_ALIGN(attr_len); 1738 int next_offset = offsetof(struct sw_flow_actions, actions) + 1739 (*sfa)->actions_len; 1740 1741 if (req_size <= (ksize(*sfa) - next_offset)) 1742 goto out; 1743 1744 new_acts_size = ksize(*sfa) * 2; 1745 1746 if (new_acts_size > MAX_ACTIONS_BUFSIZE) { 1747 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size) 1748 return ERR_PTR(-EMSGSIZE); 1749 new_acts_size = MAX_ACTIONS_BUFSIZE; 1750 } 1751 1752 acts = nla_alloc_flow_actions(new_acts_size, log); 1753 if (IS_ERR(acts)) 1754 return (void *)acts; 1755 1756 memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len); 1757 acts->actions_len = (*sfa)->actions_len; 1758 acts->orig_len = (*sfa)->orig_len; 1759 kfree(*sfa); 1760 *sfa = acts; 1761 1762 out: 1763 (*sfa)->actions_len += req_size; 1764 return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset); 1765 } 1766 1767 static struct nlattr *__add_action(struct sw_flow_actions **sfa, 1768 int attrtype, void *data, int len, bool log) 1769 { 1770 struct nlattr *a; 1771 1772 a = reserve_sfa_size(sfa, nla_attr_size(len), log); 1773 if (IS_ERR(a)) 1774 return a; 1775 1776 a->nla_type = attrtype; 1777 a->nla_len = nla_attr_size(len); 1778 1779 if (data) 1780 memcpy(nla_data(a), data, len); 1781 memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len)); 1782 1783 return a; 1784 } 1785 1786 int ovs_nla_add_action(struct sw_flow_actions **sfa, int attrtype, void *data, 1787 int len, bool log) 1788 { 1789 struct nlattr *a; 1790 1791 a = __add_action(sfa, attrtype, data, len, log); 1792 1793 return PTR_ERR_OR_ZERO(a); 1794 } 1795 1796 static inline int add_nested_action_start(struct sw_flow_actions **sfa, 1797 int attrtype, bool log) 1798 { 1799 int used = (*sfa)->actions_len; 1800 int err; 1801 1802 err = ovs_nla_add_action(sfa, attrtype, NULL, 0, log); 1803 if (err) 1804 return err; 1805 1806 return used; 1807 } 1808 1809 static inline void add_nested_action_end(struct sw_flow_actions *sfa, 1810 int st_offset) 1811 { 1812 struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + 1813 st_offset); 1814 1815 a->nla_len = sfa->actions_len - st_offset; 1816 } 1817 1818 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, 1819 const struct sw_flow_key *key, 1820 int depth, struct sw_flow_actions **sfa, 1821 __be16 eth_type, __be16 vlan_tci, bool log); 1822 1823 static int validate_and_copy_sample(struct net *net, const struct nlattr *attr, 1824 const struct sw_flow_key *key, int depth, 1825 struct sw_flow_actions **sfa, 1826 __be16 eth_type, __be16 vlan_tci, bool log) 1827 { 1828 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; 1829 const struct nlattr *probability, *actions; 1830 const struct nlattr *a; 1831 int rem, start, err, st_acts; 1832 1833 memset(attrs, 0, sizeof(attrs)); 1834 nla_for_each_nested(a, attr, rem) { 1835 int type = nla_type(a); 1836 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) 1837 return -EINVAL; 1838 attrs[type] = a; 1839 } 1840 if (rem) 1841 return -EINVAL; 1842 1843 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; 1844 if (!probability || nla_len(probability) != sizeof(u32)) 1845 return -EINVAL; 1846 1847 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; 1848 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) 1849 return -EINVAL; 1850 1851 /* validation done, copy sample action. */ 1852 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log); 1853 if (start < 0) 1854 return start; 1855 err = ovs_nla_add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY, 1856 nla_data(probability), sizeof(u32), log); 1857 if (err) 1858 return err; 1859 st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS, log); 1860 if (st_acts < 0) 1861 return st_acts; 1862 1863 err = __ovs_nla_copy_actions(net, actions, key, depth + 1, sfa, 1864 eth_type, vlan_tci, log); 1865 if (err) 1866 return err; 1867 1868 add_nested_action_end(*sfa, st_acts); 1869 add_nested_action_end(*sfa, start); 1870 1871 return 0; 1872 } 1873 1874 void ovs_match_init(struct sw_flow_match *match, 1875 struct sw_flow_key *key, 1876 struct sw_flow_mask *mask) 1877 { 1878 memset(match, 0, sizeof(*match)); 1879 match->key = key; 1880 match->mask = mask; 1881 1882 memset(key, 0, sizeof(*key)); 1883 1884 if (mask) { 1885 memset(&mask->key, 0, sizeof(mask->key)); 1886 mask->range.start = mask->range.end = 0; 1887 } 1888 } 1889 1890 static int validate_geneve_opts(struct sw_flow_key *key) 1891 { 1892 struct geneve_opt *option; 1893 int opts_len = key->tun_opts_len; 1894 bool crit_opt = false; 1895 1896 option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len); 1897 while (opts_len > 0) { 1898 int len; 1899 1900 if (opts_len < sizeof(*option)) 1901 return -EINVAL; 1902 1903 len = sizeof(*option) + option->length * 4; 1904 if (len > opts_len) 1905 return -EINVAL; 1906 1907 crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE); 1908 1909 option = (struct geneve_opt *)((u8 *)option + len); 1910 opts_len -= len; 1911 }; 1912 1913 key->tun_key.tun_flags |= crit_opt ? TUNNEL_CRIT_OPT : 0; 1914 1915 return 0; 1916 } 1917 1918 static int validate_and_copy_set_tun(const struct nlattr *attr, 1919 struct sw_flow_actions **sfa, bool log) 1920 { 1921 struct sw_flow_match match; 1922 struct sw_flow_key key; 1923 struct metadata_dst *tun_dst; 1924 struct ip_tunnel_info *tun_info; 1925 struct ovs_tunnel_info *ovs_tun; 1926 struct nlattr *a; 1927 int err = 0, start, opts_type; 1928 1929 ovs_match_init(&match, &key, NULL); 1930 opts_type = ip_tun_from_nlattr(nla_data(attr), &match, false, log); 1931 if (opts_type < 0) 1932 return opts_type; 1933 1934 if (key.tun_opts_len) { 1935 switch (opts_type) { 1936 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS: 1937 err = validate_geneve_opts(&key); 1938 if (err < 0) 1939 return err; 1940 break; 1941 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS: 1942 break; 1943 } 1944 }; 1945 1946 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log); 1947 if (start < 0) 1948 return start; 1949 1950 tun_dst = metadata_dst_alloc(key.tun_opts_len, GFP_KERNEL); 1951 if (!tun_dst) 1952 return -ENOMEM; 1953 1954 a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL, 1955 sizeof(*ovs_tun), log); 1956 if (IS_ERR(a)) { 1957 dst_release((struct dst_entry *)tun_dst); 1958 return PTR_ERR(a); 1959 } 1960 1961 ovs_tun = nla_data(a); 1962 ovs_tun->tun_dst = tun_dst; 1963 1964 tun_info = &tun_dst->u.tun_info; 1965 tun_info->mode = IP_TUNNEL_INFO_TX; 1966 if (key.tun_proto == AF_INET6) 1967 tun_info->mode |= IP_TUNNEL_INFO_IPV6; 1968 tun_info->key = key.tun_key; 1969 1970 /* We need to store the options in the action itself since 1971 * everything else will go away after flow setup. We can append 1972 * it to tun_info and then point there. 1973 */ 1974 ip_tunnel_info_opts_set(tun_info, 1975 TUN_METADATA_OPTS(&key, key.tun_opts_len), 1976 key.tun_opts_len); 1977 add_nested_action_end(*sfa, start); 1978 1979 return err; 1980 } 1981 1982 /* Return false if there are any non-masked bits set. 1983 * Mask follows data immediately, before any netlink padding. 1984 */ 1985 static bool validate_masked(u8 *data, int len) 1986 { 1987 u8 *mask = data + len; 1988 1989 while (len--) 1990 if (*data++ & ~*mask++) 1991 return false; 1992 1993 return true; 1994 } 1995 1996 static int validate_set(const struct nlattr *a, 1997 const struct sw_flow_key *flow_key, 1998 struct sw_flow_actions **sfa, 1999 bool *skip_copy, __be16 eth_type, bool masked, bool log) 2000 { 2001 const struct nlattr *ovs_key = nla_data(a); 2002 int key_type = nla_type(ovs_key); 2003 size_t key_len; 2004 2005 /* There can be only one key in a action */ 2006 if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) 2007 return -EINVAL; 2008 2009 key_len = nla_len(ovs_key); 2010 if (masked) 2011 key_len /= 2; 2012 2013 if (key_type > OVS_KEY_ATTR_MAX || 2014 !check_attr_len(key_len, ovs_key_lens[key_type].len)) 2015 return -EINVAL; 2016 2017 if (masked && !validate_masked(nla_data(ovs_key), key_len)) 2018 return -EINVAL; 2019 2020 switch (key_type) { 2021 const struct ovs_key_ipv4 *ipv4_key; 2022 const struct ovs_key_ipv6 *ipv6_key; 2023 int err; 2024 2025 case OVS_KEY_ATTR_PRIORITY: 2026 case OVS_KEY_ATTR_SKB_MARK: 2027 case OVS_KEY_ATTR_CT_MARK: 2028 case OVS_KEY_ATTR_CT_LABEL: 2029 case OVS_KEY_ATTR_ETHERNET: 2030 break; 2031 2032 case OVS_KEY_ATTR_TUNNEL: 2033 if (eth_p_mpls(eth_type)) 2034 return -EINVAL; 2035 2036 if (masked) 2037 return -EINVAL; /* Masked tunnel set not supported. */ 2038 2039 *skip_copy = true; 2040 err = validate_and_copy_set_tun(a, sfa, log); 2041 if (err) 2042 return err; 2043 break; 2044 2045 case OVS_KEY_ATTR_IPV4: 2046 if (eth_type != htons(ETH_P_IP)) 2047 return -EINVAL; 2048 2049 ipv4_key = nla_data(ovs_key); 2050 2051 if (masked) { 2052 const struct ovs_key_ipv4 *mask = ipv4_key + 1; 2053 2054 /* Non-writeable fields. */ 2055 if (mask->ipv4_proto || mask->ipv4_frag) 2056 return -EINVAL; 2057 } else { 2058 if (ipv4_key->ipv4_proto != flow_key->ip.proto) 2059 return -EINVAL; 2060 2061 if (ipv4_key->ipv4_frag != flow_key->ip.frag) 2062 return -EINVAL; 2063 } 2064 break; 2065 2066 case OVS_KEY_ATTR_IPV6: 2067 if (eth_type != htons(ETH_P_IPV6)) 2068 return -EINVAL; 2069 2070 ipv6_key = nla_data(ovs_key); 2071 2072 if (masked) { 2073 const struct ovs_key_ipv6 *mask = ipv6_key + 1; 2074 2075 /* Non-writeable fields. */ 2076 if (mask->ipv6_proto || mask->ipv6_frag) 2077 return -EINVAL; 2078 2079 /* Invalid bits in the flow label mask? */ 2080 if (ntohl(mask->ipv6_label) & 0xFFF00000) 2081 return -EINVAL; 2082 } else { 2083 if (ipv6_key->ipv6_proto != flow_key->ip.proto) 2084 return -EINVAL; 2085 2086 if (ipv6_key->ipv6_frag != flow_key->ip.frag) 2087 return -EINVAL; 2088 } 2089 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000) 2090 return -EINVAL; 2091 2092 break; 2093 2094 case OVS_KEY_ATTR_TCP: 2095 if ((eth_type != htons(ETH_P_IP) && 2096 eth_type != htons(ETH_P_IPV6)) || 2097 flow_key->ip.proto != IPPROTO_TCP) 2098 return -EINVAL; 2099 2100 break; 2101 2102 case OVS_KEY_ATTR_UDP: 2103 if ((eth_type != htons(ETH_P_IP) && 2104 eth_type != htons(ETH_P_IPV6)) || 2105 flow_key->ip.proto != IPPROTO_UDP) 2106 return -EINVAL; 2107 2108 break; 2109 2110 case OVS_KEY_ATTR_MPLS: 2111 if (!eth_p_mpls(eth_type)) 2112 return -EINVAL; 2113 break; 2114 2115 case OVS_KEY_ATTR_SCTP: 2116 if ((eth_type != htons(ETH_P_IP) && 2117 eth_type != htons(ETH_P_IPV6)) || 2118 flow_key->ip.proto != IPPROTO_SCTP) 2119 return -EINVAL; 2120 2121 break; 2122 2123 default: 2124 return -EINVAL; 2125 } 2126 2127 /* Convert non-masked non-tunnel set actions to masked set actions. */ 2128 if (!masked && key_type != OVS_KEY_ATTR_TUNNEL) { 2129 int start, len = key_len * 2; 2130 struct nlattr *at; 2131 2132 *skip_copy = true; 2133 2134 start = add_nested_action_start(sfa, 2135 OVS_ACTION_ATTR_SET_TO_MASKED, 2136 log); 2137 if (start < 0) 2138 return start; 2139 2140 at = __add_action(sfa, key_type, NULL, len, log); 2141 if (IS_ERR(at)) 2142 return PTR_ERR(at); 2143 2144 memcpy(nla_data(at), nla_data(ovs_key), key_len); /* Key. */ 2145 memset(nla_data(at) + key_len, 0xff, key_len); /* Mask. */ 2146 /* Clear non-writeable bits from otherwise writeable fields. */ 2147 if (key_type == OVS_KEY_ATTR_IPV6) { 2148 struct ovs_key_ipv6 *mask = nla_data(at) + key_len; 2149 2150 mask->ipv6_label &= htonl(0x000FFFFF); 2151 } 2152 add_nested_action_end(*sfa, start); 2153 } 2154 2155 return 0; 2156 } 2157 2158 static int validate_userspace(const struct nlattr *attr) 2159 { 2160 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { 2161 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, 2162 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC }, 2163 [OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 }, 2164 }; 2165 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; 2166 int error; 2167 2168 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, 2169 attr, userspace_policy); 2170 if (error) 2171 return error; 2172 2173 if (!a[OVS_USERSPACE_ATTR_PID] || 2174 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) 2175 return -EINVAL; 2176 2177 return 0; 2178 } 2179 2180 static int copy_action(const struct nlattr *from, 2181 struct sw_flow_actions **sfa, bool log) 2182 { 2183 int totlen = NLA_ALIGN(from->nla_len); 2184 struct nlattr *to; 2185 2186 to = reserve_sfa_size(sfa, from->nla_len, log); 2187 if (IS_ERR(to)) 2188 return PTR_ERR(to); 2189 2190 memcpy(to, from, totlen); 2191 return 0; 2192 } 2193 2194 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, 2195 const struct sw_flow_key *key, 2196 int depth, struct sw_flow_actions **sfa, 2197 __be16 eth_type, __be16 vlan_tci, bool log) 2198 { 2199 const struct nlattr *a; 2200 int rem, err; 2201 2202 if (depth >= SAMPLE_ACTION_DEPTH) 2203 return -EOVERFLOW; 2204 2205 nla_for_each_nested(a, attr, rem) { 2206 /* Expected argument lengths, (u32)-1 for variable length. */ 2207 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { 2208 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), 2209 [OVS_ACTION_ATTR_RECIRC] = sizeof(u32), 2210 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, 2211 [OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls), 2212 [OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16), 2213 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), 2214 [OVS_ACTION_ATTR_POP_VLAN] = 0, 2215 [OVS_ACTION_ATTR_SET] = (u32)-1, 2216 [OVS_ACTION_ATTR_SET_MASKED] = (u32)-1, 2217 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1, 2218 [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash), 2219 [OVS_ACTION_ATTR_CT] = (u32)-1, 2220 }; 2221 const struct ovs_action_push_vlan *vlan; 2222 int type = nla_type(a); 2223 bool skip_copy; 2224 2225 if (type > OVS_ACTION_ATTR_MAX || 2226 (action_lens[type] != nla_len(a) && 2227 action_lens[type] != (u32)-1)) 2228 return -EINVAL; 2229 2230 skip_copy = false; 2231 switch (type) { 2232 case OVS_ACTION_ATTR_UNSPEC: 2233 return -EINVAL; 2234 2235 case OVS_ACTION_ATTR_USERSPACE: 2236 err = validate_userspace(a); 2237 if (err) 2238 return err; 2239 break; 2240 2241 case OVS_ACTION_ATTR_OUTPUT: 2242 if (nla_get_u32(a) >= DP_MAX_PORTS) 2243 return -EINVAL; 2244 break; 2245 2246 case OVS_ACTION_ATTR_HASH: { 2247 const struct ovs_action_hash *act_hash = nla_data(a); 2248 2249 switch (act_hash->hash_alg) { 2250 case OVS_HASH_ALG_L4: 2251 break; 2252 default: 2253 return -EINVAL; 2254 } 2255 2256 break; 2257 } 2258 2259 case OVS_ACTION_ATTR_POP_VLAN: 2260 vlan_tci = htons(0); 2261 break; 2262 2263 case OVS_ACTION_ATTR_PUSH_VLAN: 2264 vlan = nla_data(a); 2265 if (vlan->vlan_tpid != htons(ETH_P_8021Q)) 2266 return -EINVAL; 2267 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) 2268 return -EINVAL; 2269 vlan_tci = vlan->vlan_tci; 2270 break; 2271 2272 case OVS_ACTION_ATTR_RECIRC: 2273 break; 2274 2275 case OVS_ACTION_ATTR_PUSH_MPLS: { 2276 const struct ovs_action_push_mpls *mpls = nla_data(a); 2277 2278 if (!eth_p_mpls(mpls->mpls_ethertype)) 2279 return -EINVAL; 2280 /* Prohibit push MPLS other than to a white list 2281 * for packets that have a known tag order. 2282 */ 2283 if (vlan_tci & htons(VLAN_TAG_PRESENT) || 2284 (eth_type != htons(ETH_P_IP) && 2285 eth_type != htons(ETH_P_IPV6) && 2286 eth_type != htons(ETH_P_ARP) && 2287 eth_type != htons(ETH_P_RARP) && 2288 !eth_p_mpls(eth_type))) 2289 return -EINVAL; 2290 eth_type = mpls->mpls_ethertype; 2291 break; 2292 } 2293 2294 case OVS_ACTION_ATTR_POP_MPLS: 2295 if (vlan_tci & htons(VLAN_TAG_PRESENT) || 2296 !eth_p_mpls(eth_type)) 2297 return -EINVAL; 2298 2299 /* Disallow subsequent L2.5+ set and mpls_pop actions 2300 * as there is no check here to ensure that the new 2301 * eth_type is valid and thus set actions could 2302 * write off the end of the packet or otherwise 2303 * corrupt it. 2304 * 2305 * Support for these actions is planned using packet 2306 * recirculation. 2307 */ 2308 eth_type = htons(0); 2309 break; 2310 2311 case OVS_ACTION_ATTR_SET: 2312 err = validate_set(a, key, sfa, 2313 &skip_copy, eth_type, false, log); 2314 if (err) 2315 return err; 2316 break; 2317 2318 case OVS_ACTION_ATTR_SET_MASKED: 2319 err = validate_set(a, key, sfa, 2320 &skip_copy, eth_type, true, log); 2321 if (err) 2322 return err; 2323 break; 2324 2325 case OVS_ACTION_ATTR_SAMPLE: 2326 err = validate_and_copy_sample(net, a, key, depth, sfa, 2327 eth_type, vlan_tci, log); 2328 if (err) 2329 return err; 2330 skip_copy = true; 2331 break; 2332 2333 case OVS_ACTION_ATTR_CT: 2334 err = ovs_ct_copy_action(net, a, key, sfa, log); 2335 if (err) 2336 return err; 2337 skip_copy = true; 2338 break; 2339 2340 default: 2341 OVS_NLERR(log, "Unknown Action type %d", type); 2342 return -EINVAL; 2343 } 2344 if (!skip_copy) { 2345 err = copy_action(a, sfa, log); 2346 if (err) 2347 return err; 2348 } 2349 } 2350 2351 if (rem > 0) 2352 return -EINVAL; 2353 2354 return 0; 2355 } 2356 2357 /* 'key' must be the masked key. */ 2358 int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, 2359 const struct sw_flow_key *key, 2360 struct sw_flow_actions **sfa, bool log) 2361 { 2362 int err; 2363 2364 *sfa = nla_alloc_flow_actions(nla_len(attr), log); 2365 if (IS_ERR(*sfa)) 2366 return PTR_ERR(*sfa); 2367 2368 (*sfa)->orig_len = nla_len(attr); 2369 err = __ovs_nla_copy_actions(net, attr, key, 0, sfa, key->eth.type, 2370 key->eth.tci, log); 2371 if (err) 2372 ovs_nla_free_flow_actions(*sfa); 2373 2374 return err; 2375 } 2376 2377 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb) 2378 { 2379 const struct nlattr *a; 2380 struct nlattr *start; 2381 int err = 0, rem; 2382 2383 start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE); 2384 if (!start) 2385 return -EMSGSIZE; 2386 2387 nla_for_each_nested(a, attr, rem) { 2388 int type = nla_type(a); 2389 struct nlattr *st_sample; 2390 2391 switch (type) { 2392 case OVS_SAMPLE_ATTR_PROBABILITY: 2393 if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY, 2394 sizeof(u32), nla_data(a))) 2395 return -EMSGSIZE; 2396 break; 2397 case OVS_SAMPLE_ATTR_ACTIONS: 2398 st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS); 2399 if (!st_sample) 2400 return -EMSGSIZE; 2401 err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb); 2402 if (err) 2403 return err; 2404 nla_nest_end(skb, st_sample); 2405 break; 2406 } 2407 } 2408 2409 nla_nest_end(skb, start); 2410 return err; 2411 } 2412 2413 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb) 2414 { 2415 const struct nlattr *ovs_key = nla_data(a); 2416 int key_type = nla_type(ovs_key); 2417 struct nlattr *start; 2418 int err; 2419 2420 switch (key_type) { 2421 case OVS_KEY_ATTR_TUNNEL_INFO: { 2422 struct ovs_tunnel_info *ovs_tun = nla_data(ovs_key); 2423 struct ip_tunnel_info *tun_info = &ovs_tun->tun_dst->u.tun_info; 2424 2425 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET); 2426 if (!start) 2427 return -EMSGSIZE; 2428 2429 err = ip_tun_to_nlattr(skb, &tun_info->key, 2430 tun_info->options_len ? 2431 ip_tunnel_info_opts(tun_info) : NULL, 2432 tun_info->options_len, 2433 ip_tunnel_info_af(tun_info)); 2434 if (err) 2435 return err; 2436 nla_nest_end(skb, start); 2437 break; 2438 } 2439 default: 2440 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key)) 2441 return -EMSGSIZE; 2442 break; 2443 } 2444 2445 return 0; 2446 } 2447 2448 static int masked_set_action_to_set_action_attr(const struct nlattr *a, 2449 struct sk_buff *skb) 2450 { 2451 const struct nlattr *ovs_key = nla_data(a); 2452 struct nlattr *nla; 2453 size_t key_len = nla_len(ovs_key) / 2; 2454 2455 /* Revert the conversion we did from a non-masked set action to 2456 * masked set action. 2457 */ 2458 nla = nla_nest_start(skb, OVS_ACTION_ATTR_SET); 2459 if (!nla) 2460 return -EMSGSIZE; 2461 2462 if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key))) 2463 return -EMSGSIZE; 2464 2465 nla_nest_end(skb, nla); 2466 return 0; 2467 } 2468 2469 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb) 2470 { 2471 const struct nlattr *a; 2472 int rem, err; 2473 2474 nla_for_each_attr(a, attr, len, rem) { 2475 int type = nla_type(a); 2476 2477 switch (type) { 2478 case OVS_ACTION_ATTR_SET: 2479 err = set_action_to_attr(a, skb); 2480 if (err) 2481 return err; 2482 break; 2483 2484 case OVS_ACTION_ATTR_SET_TO_MASKED: 2485 err = masked_set_action_to_set_action_attr(a, skb); 2486 if (err) 2487 return err; 2488 break; 2489 2490 case OVS_ACTION_ATTR_SAMPLE: 2491 err = sample_action_to_attr(a, skb); 2492 if (err) 2493 return err; 2494 break; 2495 2496 case OVS_ACTION_ATTR_CT: 2497 err = ovs_ct_action_to_attr(nla_data(a), skb); 2498 if (err) 2499 return err; 2500 break; 2501 2502 default: 2503 if (nla_put(skb, type, nla_len(a), nla_data(a))) 2504 return -EMSGSIZE; 2505 break; 2506 } 2507 } 2508 2509 return 0; 2510 } 2511