1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2017 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include "flow.h" 9 #include "datapath.h" 10 #include <linux/uaccess.h> 11 #include <linux/netdevice.h> 12 #include <linux/etherdevice.h> 13 #include <linux/if_ether.h> 14 #include <linux/if_vlan.h> 15 #include <net/llc_pdu.h> 16 #include <linux/kernel.h> 17 #include <linux/jhash.h> 18 #include <linux/jiffies.h> 19 #include <linux/llc.h> 20 #include <linux/module.h> 21 #include <linux/in.h> 22 #include <linux/rcupdate.h> 23 #include <linux/if_arp.h> 24 #include <linux/ip.h> 25 #include <linux/ipv6.h> 26 #include <linux/sctp.h> 27 #include <linux/tcp.h> 28 #include <linux/udp.h> 29 #include <linux/icmp.h> 30 #include <linux/icmpv6.h> 31 #include <linux/rculist.h> 32 #include <net/geneve.h> 33 #include <net/ip.h> 34 #include <net/ipv6.h> 35 #include <net/ndisc.h> 36 #include <net/mpls.h> 37 #include <net/vxlan.h> 38 #include <net/tun_proto.h> 39 #include <net/erspan.h> 40 41 #include "drop.h" 42 #include "flow_netlink.h" 43 44 struct ovs_len_tbl { 45 int len; 46 const struct ovs_len_tbl *next; 47 }; 48 49 #define OVS_ATTR_NESTED -1 50 #define OVS_ATTR_VARIABLE -2 51 #define OVS_COPY_ACTIONS_MAX_DEPTH 16 52 53 static bool actions_may_change_flow(const struct nlattr *actions) 54 { 55 struct nlattr *nla; 56 int rem; 57 58 nla_for_each_nested(nla, actions, rem) { 59 u16 action = nla_type(nla); 60 61 switch (action) { 62 case OVS_ACTION_ATTR_OUTPUT: 63 case OVS_ACTION_ATTR_RECIRC: 64 case OVS_ACTION_ATTR_TRUNC: 65 case OVS_ACTION_ATTR_USERSPACE: 66 case OVS_ACTION_ATTR_DROP: 67 case OVS_ACTION_ATTR_PSAMPLE: 68 break; 69 70 case OVS_ACTION_ATTR_CT: 71 case OVS_ACTION_ATTR_CT_CLEAR: 72 case OVS_ACTION_ATTR_HASH: 73 case OVS_ACTION_ATTR_POP_ETH: 74 case OVS_ACTION_ATTR_POP_MPLS: 75 case OVS_ACTION_ATTR_POP_NSH: 76 case OVS_ACTION_ATTR_POP_VLAN: 77 case OVS_ACTION_ATTR_PUSH_ETH: 78 case OVS_ACTION_ATTR_PUSH_MPLS: 79 case OVS_ACTION_ATTR_PUSH_NSH: 80 case OVS_ACTION_ATTR_PUSH_VLAN: 81 case OVS_ACTION_ATTR_SAMPLE: 82 case OVS_ACTION_ATTR_SET: 83 case OVS_ACTION_ATTR_SET_MASKED: 84 case OVS_ACTION_ATTR_METER: 85 case OVS_ACTION_ATTR_CHECK_PKT_LEN: 86 case OVS_ACTION_ATTR_ADD_MPLS: 87 case OVS_ACTION_ATTR_DEC_TTL: 88 default: 89 return true; 90 } 91 } 92 return false; 93 } 94 95 static void update_range(struct sw_flow_match *match, 96 size_t offset, size_t size, bool is_mask) 97 { 98 struct sw_flow_key_range *range; 99 size_t start = rounddown(offset, sizeof(long)); 100 size_t end = roundup(offset + size, sizeof(long)); 101 102 if (!is_mask) 103 range = &match->range; 104 else 105 range = &match->mask->range; 106 107 if (range->start == range->end) { 108 range->start = start; 109 range->end = end; 110 return; 111 } 112 113 if (range->start > start) 114 range->start = start; 115 116 if (range->end < end) 117 range->end = end; 118 } 119 120 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \ 121 do { \ 122 update_range(match, offsetof(struct sw_flow_key, field), \ 123 sizeof((match)->key->field), is_mask); \ 124 if (is_mask) \ 125 (match)->mask->key.field = value; \ 126 else \ 127 (match)->key->field = value; \ 128 } while (0) 129 130 #define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask) \ 131 do { \ 132 update_range(match, offset, len, is_mask); \ 133 if (is_mask) \ 134 memcpy((u8 *)&(match)->mask->key + offset, value_p, \ 135 len); \ 136 else \ 137 memcpy((u8 *)(match)->key + offset, value_p, len); \ 138 } while (0) 139 140 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask) \ 141 SW_FLOW_KEY_MEMCPY_OFFSET(match, offsetof(struct sw_flow_key, field), \ 142 value_p, len, is_mask) 143 144 #define SW_FLOW_KEY_MEMSET_FIELD(match, field, value, is_mask) \ 145 do { \ 146 update_range(match, offsetof(struct sw_flow_key, field), \ 147 sizeof((match)->key->field), is_mask); \ 148 if (is_mask) \ 149 memset((u8 *)&(match)->mask->key.field, value, \ 150 sizeof((match)->mask->key.field)); \ 151 else \ 152 memset((u8 *)&(match)->key->field, value, \ 153 sizeof((match)->key->field)); \ 154 } while (0) 155 156 #define SW_FLOW_KEY_BITMAP_COPY(match, field, value_p, nbits, is_mask) ({ \ 157 update_range(match, offsetof(struct sw_flow_key, field), \ 158 bitmap_size(nbits), is_mask); \ 159 bitmap_copy(is_mask ? (match)->mask->key.field : (match)->key->field, \ 160 value_p, nbits); \ 161 }) 162 163 static bool match_validate(const struct sw_flow_match *match, 164 u64 key_attrs, u64 mask_attrs, bool log) 165 { 166 u64 key_expected = 0; 167 u64 mask_allowed = key_attrs; /* At most allow all key attributes */ 168 169 /* The following mask attributes allowed only if they 170 * pass the validation tests. */ 171 mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4) 172 | (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) 173 | (1 << OVS_KEY_ATTR_IPV6) 174 | (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) 175 | (1 << OVS_KEY_ATTR_TCP) 176 | (1 << OVS_KEY_ATTR_TCP_FLAGS) 177 | (1 << OVS_KEY_ATTR_UDP) 178 | (1 << OVS_KEY_ATTR_SCTP) 179 | (1 << OVS_KEY_ATTR_ICMP) 180 | (1 << OVS_KEY_ATTR_ICMPV6) 181 | (1 << OVS_KEY_ATTR_ARP) 182 | (1 << OVS_KEY_ATTR_ND) 183 | (1 << OVS_KEY_ATTR_MPLS) 184 | (1 << OVS_KEY_ATTR_NSH)); 185 186 /* Always allowed mask fields. */ 187 mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL) 188 | (1 << OVS_KEY_ATTR_IN_PORT) 189 | (1 << OVS_KEY_ATTR_ETHERTYPE)); 190 191 /* Check key attributes. */ 192 if (match->key->eth.type == htons(ETH_P_ARP) 193 || match->key->eth.type == htons(ETH_P_RARP)) { 194 key_expected |= 1 << OVS_KEY_ATTR_ARP; 195 if (match->mask && (match->mask->key.eth.type == htons(0xffff))) 196 mask_allowed |= 1 << OVS_KEY_ATTR_ARP; 197 } 198 199 if (eth_p_mpls(match->key->eth.type)) { 200 key_expected |= 1 << OVS_KEY_ATTR_MPLS; 201 if (match->mask && (match->mask->key.eth.type == htons(0xffff))) 202 mask_allowed |= 1 << OVS_KEY_ATTR_MPLS; 203 } 204 205 if (match->key->eth.type == htons(ETH_P_IP)) { 206 key_expected |= 1 << OVS_KEY_ATTR_IPV4; 207 if (match->mask && match->mask->key.eth.type == htons(0xffff)) { 208 mask_allowed |= 1 << OVS_KEY_ATTR_IPV4; 209 mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4; 210 } 211 212 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) { 213 if (match->key->ip.proto == IPPROTO_UDP) { 214 key_expected |= 1 << OVS_KEY_ATTR_UDP; 215 if (match->mask && (match->mask->key.ip.proto == 0xff)) 216 mask_allowed |= 1 << OVS_KEY_ATTR_UDP; 217 } 218 219 if (match->key->ip.proto == IPPROTO_SCTP) { 220 key_expected |= 1 << OVS_KEY_ATTR_SCTP; 221 if (match->mask && (match->mask->key.ip.proto == 0xff)) 222 mask_allowed |= 1 << OVS_KEY_ATTR_SCTP; 223 } 224 225 if (match->key->ip.proto == IPPROTO_TCP) { 226 key_expected |= 1 << OVS_KEY_ATTR_TCP; 227 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS; 228 if (match->mask && (match->mask->key.ip.proto == 0xff)) { 229 mask_allowed |= 1 << OVS_KEY_ATTR_TCP; 230 mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS; 231 } 232 } 233 234 if (match->key->ip.proto == IPPROTO_ICMP) { 235 key_expected |= 1 << OVS_KEY_ATTR_ICMP; 236 if (match->mask && (match->mask->key.ip.proto == 0xff)) 237 mask_allowed |= 1 << OVS_KEY_ATTR_ICMP; 238 } 239 } 240 } 241 242 if (match->key->eth.type == htons(ETH_P_IPV6)) { 243 key_expected |= 1 << OVS_KEY_ATTR_IPV6; 244 if (match->mask && match->mask->key.eth.type == htons(0xffff)) { 245 mask_allowed |= 1 << OVS_KEY_ATTR_IPV6; 246 mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6; 247 } 248 249 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) { 250 if (match->key->ip.proto == IPPROTO_UDP) { 251 key_expected |= 1 << OVS_KEY_ATTR_UDP; 252 if (match->mask && (match->mask->key.ip.proto == 0xff)) 253 mask_allowed |= 1 << OVS_KEY_ATTR_UDP; 254 } 255 256 if (match->key->ip.proto == IPPROTO_SCTP) { 257 key_expected |= 1 << OVS_KEY_ATTR_SCTP; 258 if (match->mask && (match->mask->key.ip.proto == 0xff)) 259 mask_allowed |= 1 << OVS_KEY_ATTR_SCTP; 260 } 261 262 if (match->key->ip.proto == IPPROTO_TCP) { 263 key_expected |= 1 << OVS_KEY_ATTR_TCP; 264 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS; 265 if (match->mask && (match->mask->key.ip.proto == 0xff)) { 266 mask_allowed |= 1 << OVS_KEY_ATTR_TCP; 267 mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS; 268 } 269 } 270 271 if (match->key->ip.proto == IPPROTO_ICMPV6) { 272 key_expected |= 1 << OVS_KEY_ATTR_ICMPV6; 273 if (match->mask && (match->mask->key.ip.proto == 0xff)) 274 mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6; 275 276 if (match->key->tp.src == 277 htons(NDISC_NEIGHBOUR_SOLICITATION) || 278 match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) { 279 key_expected |= 1 << OVS_KEY_ATTR_ND; 280 /* Original direction conntrack tuple 281 * uses the same space as the ND fields 282 * in the key, so both are not allowed 283 * at the same time. 284 */ 285 mask_allowed &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6); 286 if (match->mask && (match->mask->key.tp.src == htons(0xff))) 287 mask_allowed |= 1 << OVS_KEY_ATTR_ND; 288 } 289 } 290 } 291 } 292 293 if (match->key->eth.type == htons(ETH_P_NSH)) { 294 key_expected |= 1 << OVS_KEY_ATTR_NSH; 295 if (match->mask && 296 match->mask->key.eth.type == htons(0xffff)) { 297 mask_allowed |= 1 << OVS_KEY_ATTR_NSH; 298 } 299 } 300 301 if ((key_attrs & key_expected) != key_expected) { 302 /* Key attributes check failed. */ 303 OVS_NLERR(log, "Missing key (keys=%llx, expected=%llx)", 304 (unsigned long long)key_attrs, 305 (unsigned long long)key_expected); 306 return false; 307 } 308 309 if ((mask_attrs & mask_allowed) != mask_attrs) { 310 /* Mask attributes check failed. */ 311 OVS_NLERR(log, "Unexpected mask (mask=%llx, allowed=%llx)", 312 (unsigned long long)mask_attrs, 313 (unsigned long long)mask_allowed); 314 return false; 315 } 316 317 return true; 318 } 319 320 size_t ovs_tun_key_attr_size(void) 321 { 322 /* Whenever adding new OVS_TUNNEL_KEY_ FIELDS, we should consider 323 * updating this function. 324 */ 325 return nla_total_size_64bit(8) /* OVS_TUNNEL_KEY_ATTR_ID */ 326 + nla_total_size(16) /* OVS_TUNNEL_KEY_ATTR_IPV[46]_SRC */ 327 + nla_total_size(16) /* OVS_TUNNEL_KEY_ATTR_IPV[46]_DST */ 328 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */ 329 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */ 330 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */ 331 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */ 332 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_OAM */ 333 + nla_total_size(256) /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */ 334 /* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS and 335 * OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS is mutually exclusive with 336 * OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it. 337 */ 338 + nla_total_size(2) /* OVS_TUNNEL_KEY_ATTR_TP_SRC */ 339 + nla_total_size(2); /* OVS_TUNNEL_KEY_ATTR_TP_DST */ 340 } 341 342 static size_t ovs_nsh_key_attr_size(void) 343 { 344 /* Whenever adding new OVS_NSH_KEY_ FIELDS, we should consider 345 * updating this function. 346 */ 347 return nla_total_size(NSH_BASE_HDR_LEN) /* OVS_NSH_KEY_ATTR_BASE */ 348 /* OVS_NSH_KEY_ATTR_MD1 and OVS_NSH_KEY_ATTR_MD2 are 349 * mutually exclusive, so the bigger one can cover 350 * the small one. 351 */ 352 + nla_total_size(NSH_CTX_HDRS_MAX_LEN); 353 } 354 355 size_t ovs_key_attr_size(void) 356 { 357 /* Whenever adding new OVS_KEY_ FIELDS, we should consider 358 * updating this function. 359 */ 360 BUILD_BUG_ON(OVS_KEY_ATTR_MAX != 32); 361 362 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */ 363 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */ 364 + ovs_tun_key_attr_size() 365 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */ 366 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */ 367 + nla_total_size(4) /* OVS_KEY_ATTR_DP_HASH */ 368 + nla_total_size(4) /* OVS_KEY_ATTR_RECIRC_ID */ 369 + nla_total_size(4) /* OVS_KEY_ATTR_CT_STATE */ 370 + nla_total_size(2) /* OVS_KEY_ATTR_CT_ZONE */ 371 + nla_total_size(4) /* OVS_KEY_ATTR_CT_MARK */ 372 + nla_total_size(16) /* OVS_KEY_ATTR_CT_LABELS */ 373 + nla_total_size(40) /* OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6 */ 374 + nla_total_size(0) /* OVS_KEY_ATTR_NSH */ 375 + ovs_nsh_key_attr_size() 376 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */ 377 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 378 + nla_total_size(4) /* OVS_KEY_ATTR_VLAN */ 379 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */ 380 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 381 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */ 382 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */ 383 + nla_total_size(28) /* OVS_KEY_ATTR_ND */ 384 + nla_total_size(2); /* OVS_KEY_ATTR_IPV6_EXTHDRS */ 385 } 386 387 static const struct ovs_len_tbl ovs_vxlan_ext_key_lens[OVS_VXLAN_EXT_MAX + 1] = { 388 [OVS_VXLAN_EXT_GBP] = { .len = sizeof(u32) }, 389 }; 390 391 static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = { 392 [OVS_TUNNEL_KEY_ATTR_ID] = { .len = sizeof(u64) }, 393 [OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = { .len = sizeof(u32) }, 394 [OVS_TUNNEL_KEY_ATTR_IPV4_DST] = { .len = sizeof(u32) }, 395 [OVS_TUNNEL_KEY_ATTR_TOS] = { .len = 1 }, 396 [OVS_TUNNEL_KEY_ATTR_TTL] = { .len = 1 }, 397 [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = { .len = 0 }, 398 [OVS_TUNNEL_KEY_ATTR_CSUM] = { .len = 0 }, 399 [OVS_TUNNEL_KEY_ATTR_TP_SRC] = { .len = sizeof(u16) }, 400 [OVS_TUNNEL_KEY_ATTR_TP_DST] = { .len = sizeof(u16) }, 401 [OVS_TUNNEL_KEY_ATTR_OAM] = { .len = 0 }, 402 [OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS] = { .len = OVS_ATTR_VARIABLE }, 403 [OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS] = { .len = OVS_ATTR_NESTED, 404 .next = ovs_vxlan_ext_key_lens }, 405 [OVS_TUNNEL_KEY_ATTR_IPV6_SRC] = { .len = sizeof(struct in6_addr) }, 406 [OVS_TUNNEL_KEY_ATTR_IPV6_DST] = { .len = sizeof(struct in6_addr) }, 407 [OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS] = { .len = OVS_ATTR_VARIABLE }, 408 [OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE] = { .len = 0 }, 409 }; 410 411 static const struct ovs_len_tbl 412 ovs_nsh_key_attr_lens[OVS_NSH_KEY_ATTR_MAX + 1] = { 413 [OVS_NSH_KEY_ATTR_BASE] = { .len = sizeof(struct ovs_nsh_key_base) }, 414 [OVS_NSH_KEY_ATTR_MD1] = { .len = sizeof(struct ovs_nsh_key_md1) }, 415 [OVS_NSH_KEY_ATTR_MD2] = { .len = OVS_ATTR_VARIABLE }, 416 }; 417 418 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */ 419 static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = { 420 [OVS_KEY_ATTR_ENCAP] = { .len = OVS_ATTR_NESTED }, 421 [OVS_KEY_ATTR_PRIORITY] = { .len = sizeof(u32) }, 422 [OVS_KEY_ATTR_IN_PORT] = { .len = sizeof(u32) }, 423 [OVS_KEY_ATTR_SKB_MARK] = { .len = sizeof(u32) }, 424 [OVS_KEY_ATTR_ETHERNET] = { .len = sizeof(struct ovs_key_ethernet) }, 425 [OVS_KEY_ATTR_VLAN] = { .len = sizeof(__be16) }, 426 [OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) }, 427 [OVS_KEY_ATTR_IPV4] = { .len = sizeof(struct ovs_key_ipv4) }, 428 [OVS_KEY_ATTR_IPV6] = { .len = sizeof(struct ovs_key_ipv6) }, 429 [OVS_KEY_ATTR_TCP] = { .len = sizeof(struct ovs_key_tcp) }, 430 [OVS_KEY_ATTR_TCP_FLAGS] = { .len = sizeof(__be16) }, 431 [OVS_KEY_ATTR_UDP] = { .len = sizeof(struct ovs_key_udp) }, 432 [OVS_KEY_ATTR_SCTP] = { .len = sizeof(struct ovs_key_sctp) }, 433 [OVS_KEY_ATTR_ICMP] = { .len = sizeof(struct ovs_key_icmp) }, 434 [OVS_KEY_ATTR_ICMPV6] = { .len = sizeof(struct ovs_key_icmpv6) }, 435 [OVS_KEY_ATTR_ARP] = { .len = sizeof(struct ovs_key_arp) }, 436 [OVS_KEY_ATTR_ND] = { .len = sizeof(struct ovs_key_nd) }, 437 [OVS_KEY_ATTR_RECIRC_ID] = { .len = sizeof(u32) }, 438 [OVS_KEY_ATTR_DP_HASH] = { .len = sizeof(u32) }, 439 [OVS_KEY_ATTR_TUNNEL] = { .len = OVS_ATTR_NESTED, 440 .next = ovs_tunnel_key_lens, }, 441 [OVS_KEY_ATTR_MPLS] = { .len = OVS_ATTR_VARIABLE }, 442 [OVS_KEY_ATTR_CT_STATE] = { .len = sizeof(u32) }, 443 [OVS_KEY_ATTR_CT_ZONE] = { .len = sizeof(u16) }, 444 [OVS_KEY_ATTR_CT_MARK] = { .len = sizeof(u32) }, 445 [OVS_KEY_ATTR_CT_LABELS] = { .len = sizeof(struct ovs_key_ct_labels) }, 446 [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4] = { 447 .len = sizeof(struct ovs_key_ct_tuple_ipv4) }, 448 [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6] = { 449 .len = sizeof(struct ovs_key_ct_tuple_ipv6) }, 450 [OVS_KEY_ATTR_NSH] = { .len = OVS_ATTR_NESTED, 451 .next = ovs_nsh_key_attr_lens, }, 452 [OVS_KEY_ATTR_IPV6_EXTHDRS] = { 453 .len = sizeof(struct ovs_key_ipv6_exthdrs) }, 454 }; 455 456 static bool check_attr_len(unsigned int attr_len, unsigned int expected_len) 457 { 458 return expected_len == attr_len || 459 expected_len == OVS_ATTR_NESTED || 460 expected_len == OVS_ATTR_VARIABLE; 461 } 462 463 static bool is_all_zero(const u8 *fp, size_t size) 464 { 465 int i; 466 467 if (!fp) 468 return false; 469 470 for (i = 0; i < size; i++) 471 if (fp[i]) 472 return false; 473 474 return true; 475 } 476 477 static int __parse_flow_nlattrs(const struct nlattr *attr, 478 const struct nlattr *a[], 479 u64 *attrsp, bool log, bool nz) 480 { 481 const struct nlattr *nla; 482 u64 attrs; 483 int rem; 484 485 attrs = *attrsp; 486 nla_for_each_nested(nla, attr, rem) { 487 u16 type = nla_type(nla); 488 int expected_len; 489 490 if (type > OVS_KEY_ATTR_MAX) { 491 OVS_NLERR(log, "Key type %d is out of range max %d", 492 type, OVS_KEY_ATTR_MAX); 493 return -EINVAL; 494 } 495 496 if (type == OVS_KEY_ATTR_PACKET_TYPE || 497 type == OVS_KEY_ATTR_ND_EXTENSIONS || 498 type == OVS_KEY_ATTR_TUNNEL_INFO) { 499 OVS_NLERR(log, "Key type %d is not supported", type); 500 return -EINVAL; 501 } 502 503 if (attrs & (1ULL << type)) { 504 OVS_NLERR(log, "Duplicate key (type %d).", type); 505 return -EINVAL; 506 } 507 508 expected_len = ovs_key_lens[type].len; 509 if (!check_attr_len(nla_len(nla), expected_len)) { 510 OVS_NLERR(log, "Key %d has unexpected len %d expected %d", 511 type, nla_len(nla), expected_len); 512 return -EINVAL; 513 } 514 515 if (!nz || !is_all_zero(nla_data(nla), nla_len(nla))) { 516 attrs |= 1ULL << type; 517 a[type] = nla; 518 } 519 } 520 if (rem) { 521 OVS_NLERR(log, "Message has %d unknown bytes.", rem); 522 return -EINVAL; 523 } 524 525 *attrsp = attrs; 526 return 0; 527 } 528 529 static int parse_flow_mask_nlattrs(const struct nlattr *attr, 530 const struct nlattr *a[], u64 *attrsp, 531 bool log) 532 { 533 return __parse_flow_nlattrs(attr, a, attrsp, log, true); 534 } 535 536 int parse_flow_nlattrs(const struct nlattr *attr, const struct nlattr *a[], 537 u64 *attrsp, bool log) 538 { 539 return __parse_flow_nlattrs(attr, a, attrsp, log, false); 540 } 541 542 static int genev_tun_opt_from_nlattr(const struct nlattr *a, 543 struct sw_flow_match *match, bool is_mask, 544 bool log) 545 { 546 unsigned long opt_key_offset; 547 548 if (nla_len(a) > sizeof(match->key->tun_opts)) { 549 OVS_NLERR(log, "Geneve option length err (len %d, max %zu).", 550 nla_len(a), sizeof(match->key->tun_opts)); 551 return -EINVAL; 552 } 553 554 if (nla_len(a) % 4 != 0) { 555 OVS_NLERR(log, "Geneve opt len %d is not a multiple of 4.", 556 nla_len(a)); 557 return -EINVAL; 558 } 559 560 /* We need to record the length of the options passed 561 * down, otherwise packets with the same format but 562 * additional options will be silently matched. 563 */ 564 if (!is_mask) { 565 SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a), 566 false); 567 } else { 568 /* This is somewhat unusual because it looks at 569 * both the key and mask while parsing the 570 * attributes (and by extension assumes the key 571 * is parsed first). Normally, we would verify 572 * that each is the correct length and that the 573 * attributes line up in the validate function. 574 * However, that is difficult because this is 575 * variable length and we won't have the 576 * information later. 577 */ 578 if (match->key->tun_opts_len != nla_len(a)) { 579 OVS_NLERR(log, "Geneve option len %d != mask len %d", 580 match->key->tun_opts_len, nla_len(a)); 581 return -EINVAL; 582 } 583 584 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true); 585 } 586 587 opt_key_offset = TUN_METADATA_OFFSET(nla_len(a)); 588 SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a), 589 nla_len(a), is_mask); 590 return 0; 591 } 592 593 static int vxlan_tun_opt_from_nlattr(const struct nlattr *attr, 594 struct sw_flow_match *match, bool is_mask, 595 bool log) 596 { 597 struct nlattr *a; 598 int rem; 599 unsigned long opt_key_offset; 600 struct vxlan_metadata opts; 601 602 BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts)); 603 604 memset(&opts, 0, sizeof(opts)); 605 nla_for_each_nested(a, attr, rem) { 606 int type = nla_type(a); 607 608 if (type > OVS_VXLAN_EXT_MAX) { 609 OVS_NLERR(log, "VXLAN extension %d out of range max %d", 610 type, OVS_VXLAN_EXT_MAX); 611 return -EINVAL; 612 } 613 614 if (!check_attr_len(nla_len(a), 615 ovs_vxlan_ext_key_lens[type].len)) { 616 OVS_NLERR(log, "VXLAN extension %d has unexpected len %d expected %d", 617 type, nla_len(a), 618 ovs_vxlan_ext_key_lens[type].len); 619 return -EINVAL; 620 } 621 622 switch (type) { 623 case OVS_VXLAN_EXT_GBP: 624 opts.gbp = nla_get_u32(a); 625 break; 626 default: 627 OVS_NLERR(log, "Unknown VXLAN extension attribute %d", 628 type); 629 return -EINVAL; 630 } 631 } 632 if (rem) { 633 OVS_NLERR(log, "VXLAN extension message has %d unknown bytes.", 634 rem); 635 return -EINVAL; 636 } 637 638 if (!is_mask) 639 SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), false); 640 else 641 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true); 642 643 opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts)); 644 SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts), 645 is_mask); 646 return 0; 647 } 648 649 static int erspan_tun_opt_from_nlattr(const struct nlattr *a, 650 struct sw_flow_match *match, bool is_mask, 651 bool log) 652 { 653 unsigned long opt_key_offset; 654 655 BUILD_BUG_ON(sizeof(struct erspan_metadata) > 656 sizeof(match->key->tun_opts)); 657 658 if (nla_len(a) > sizeof(match->key->tun_opts)) { 659 OVS_NLERR(log, "ERSPAN option length err (len %d, max %zu).", 660 nla_len(a), sizeof(match->key->tun_opts)); 661 return -EINVAL; 662 } 663 664 if (!is_mask) 665 SW_FLOW_KEY_PUT(match, tun_opts_len, 666 sizeof(struct erspan_metadata), false); 667 else 668 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true); 669 670 opt_key_offset = TUN_METADATA_OFFSET(nla_len(a)); 671 SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a), 672 nla_len(a), is_mask); 673 return 0; 674 } 675 676 static int ip_tun_from_nlattr(const struct nlattr *attr, 677 struct sw_flow_match *match, bool is_mask, 678 bool log) 679 { 680 bool ttl = false, ipv4 = false, ipv6 = false; 681 IP_TUNNEL_DECLARE_FLAGS(tun_flags) = { }; 682 bool info_bridge_mode = false; 683 int opts_type = 0; 684 struct nlattr *a; 685 int rem; 686 687 nla_for_each_nested(a, attr, rem) { 688 int type = nla_type(a); 689 int err; 690 691 if (type > OVS_TUNNEL_KEY_ATTR_MAX) { 692 OVS_NLERR(log, "Tunnel attr %d out of range max %d", 693 type, OVS_TUNNEL_KEY_ATTR_MAX); 694 return -EINVAL; 695 } 696 697 if (!check_attr_len(nla_len(a), 698 ovs_tunnel_key_lens[type].len)) { 699 OVS_NLERR(log, "Tunnel attr %d has unexpected len %d expected %d", 700 type, nla_len(a), ovs_tunnel_key_lens[type].len); 701 return -EINVAL; 702 } 703 704 switch (type) { 705 case OVS_TUNNEL_KEY_ATTR_ID: 706 SW_FLOW_KEY_PUT(match, tun_key.tun_id, 707 nla_get_be64(a), is_mask); 708 __set_bit(IP_TUNNEL_KEY_BIT, tun_flags); 709 break; 710 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC: 711 SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.src, 712 nla_get_in_addr(a), is_mask); 713 ipv4 = true; 714 break; 715 case OVS_TUNNEL_KEY_ATTR_IPV4_DST: 716 SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.dst, 717 nla_get_in_addr(a), is_mask); 718 ipv4 = true; 719 break; 720 case OVS_TUNNEL_KEY_ATTR_IPV6_SRC: 721 SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.src, 722 nla_get_in6_addr(a), is_mask); 723 ipv6 = true; 724 break; 725 case OVS_TUNNEL_KEY_ATTR_IPV6_DST: 726 SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.dst, 727 nla_get_in6_addr(a), is_mask); 728 ipv6 = true; 729 break; 730 case OVS_TUNNEL_KEY_ATTR_TOS: 731 SW_FLOW_KEY_PUT(match, tun_key.tos, 732 nla_get_u8(a), is_mask); 733 break; 734 case OVS_TUNNEL_KEY_ATTR_TTL: 735 SW_FLOW_KEY_PUT(match, tun_key.ttl, 736 nla_get_u8(a), is_mask); 737 ttl = true; 738 break; 739 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT: 740 __set_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, tun_flags); 741 break; 742 case OVS_TUNNEL_KEY_ATTR_CSUM: 743 __set_bit(IP_TUNNEL_CSUM_BIT, tun_flags); 744 break; 745 case OVS_TUNNEL_KEY_ATTR_TP_SRC: 746 SW_FLOW_KEY_PUT(match, tun_key.tp_src, 747 nla_get_be16(a), is_mask); 748 break; 749 case OVS_TUNNEL_KEY_ATTR_TP_DST: 750 SW_FLOW_KEY_PUT(match, tun_key.tp_dst, 751 nla_get_be16(a), is_mask); 752 break; 753 case OVS_TUNNEL_KEY_ATTR_OAM: 754 __set_bit(IP_TUNNEL_OAM_BIT, tun_flags); 755 break; 756 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS: 757 if (opts_type) { 758 OVS_NLERR(log, "Multiple metadata blocks provided"); 759 return -EINVAL; 760 } 761 762 err = genev_tun_opt_from_nlattr(a, match, is_mask, log); 763 if (err) 764 return err; 765 766 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, tun_flags); 767 opts_type = type; 768 break; 769 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS: 770 if (opts_type) { 771 OVS_NLERR(log, "Multiple metadata blocks provided"); 772 return -EINVAL; 773 } 774 775 err = vxlan_tun_opt_from_nlattr(a, match, is_mask, log); 776 if (err) 777 return err; 778 779 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, tun_flags); 780 opts_type = type; 781 break; 782 case OVS_TUNNEL_KEY_ATTR_PAD: 783 break; 784 case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS: 785 if (opts_type) { 786 OVS_NLERR(log, "Multiple metadata blocks provided"); 787 return -EINVAL; 788 } 789 790 err = erspan_tun_opt_from_nlattr(a, match, is_mask, 791 log); 792 if (err) 793 return err; 794 795 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, tun_flags); 796 opts_type = type; 797 break; 798 case OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE: 799 info_bridge_mode = true; 800 ipv4 = true; 801 break; 802 default: 803 OVS_NLERR(log, "Unknown IP tunnel attribute %d", 804 type); 805 return -EINVAL; 806 } 807 } 808 809 SW_FLOW_KEY_BITMAP_COPY(match, tun_key.tun_flags, tun_flags, 810 __IP_TUNNEL_FLAG_NUM, is_mask); 811 if (is_mask) 812 SW_FLOW_KEY_MEMSET_FIELD(match, tun_proto, 0xff, true); 813 else 814 SW_FLOW_KEY_PUT(match, tun_proto, ipv6 ? AF_INET6 : AF_INET, 815 false); 816 817 if (rem > 0) { 818 OVS_NLERR(log, "IP tunnel attribute has %d unknown bytes.", 819 rem); 820 return -EINVAL; 821 } 822 823 if (ipv4 && ipv6) { 824 OVS_NLERR(log, "Mixed IPv4 and IPv6 tunnel attributes"); 825 return -EINVAL; 826 } 827 828 if (!is_mask) { 829 if (!ipv4 && !ipv6) { 830 OVS_NLERR(log, "IP tunnel dst address not specified"); 831 return -EINVAL; 832 } 833 if (ipv4) { 834 if (info_bridge_mode) { 835 __clear_bit(IP_TUNNEL_KEY_BIT, tun_flags); 836 837 if (match->key->tun_key.u.ipv4.src || 838 match->key->tun_key.u.ipv4.dst || 839 match->key->tun_key.tp_src || 840 match->key->tun_key.tp_dst || 841 match->key->tun_key.ttl || 842 match->key->tun_key.tos || 843 !ip_tunnel_flags_empty(tun_flags)) { 844 OVS_NLERR(log, "IPv4 tun info is not correct"); 845 return -EINVAL; 846 } 847 } else if (!match->key->tun_key.u.ipv4.dst) { 848 OVS_NLERR(log, "IPv4 tunnel dst address is zero"); 849 return -EINVAL; 850 } 851 } 852 if (ipv6 && ipv6_addr_any(&match->key->tun_key.u.ipv6.dst)) { 853 OVS_NLERR(log, "IPv6 tunnel dst address is zero"); 854 return -EINVAL; 855 } 856 857 if (!ttl && !info_bridge_mode) { 858 OVS_NLERR(log, "IP tunnel TTL not specified."); 859 return -EINVAL; 860 } 861 } 862 863 return opts_type; 864 } 865 866 static int vxlan_opt_to_nlattr(struct sk_buff *skb, 867 const void *tun_opts, int swkey_tun_opts_len) 868 { 869 const struct vxlan_metadata *opts = tun_opts; 870 struct nlattr *nla; 871 872 nla = nla_nest_start_noflag(skb, OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS); 873 if (!nla) 874 return -EMSGSIZE; 875 876 if (nla_put_u32(skb, OVS_VXLAN_EXT_GBP, opts->gbp) < 0) 877 return -EMSGSIZE; 878 879 nla_nest_end(skb, nla); 880 return 0; 881 } 882 883 static int __ip_tun_to_nlattr(struct sk_buff *skb, 884 const struct ip_tunnel_key *output, 885 const void *tun_opts, int swkey_tun_opts_len, 886 unsigned short tun_proto, u8 mode) 887 { 888 if (test_bit(IP_TUNNEL_KEY_BIT, output->tun_flags) && 889 nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id, 890 OVS_TUNNEL_KEY_ATTR_PAD)) 891 return -EMSGSIZE; 892 893 if (mode & IP_TUNNEL_INFO_BRIDGE) 894 return nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE) 895 ? -EMSGSIZE : 0; 896 897 switch (tun_proto) { 898 case AF_INET: 899 if (output->u.ipv4.src && 900 nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, 901 output->u.ipv4.src)) 902 return -EMSGSIZE; 903 if (output->u.ipv4.dst && 904 nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, 905 output->u.ipv4.dst)) 906 return -EMSGSIZE; 907 break; 908 case AF_INET6: 909 if (!ipv6_addr_any(&output->u.ipv6.src) && 910 nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_SRC, 911 &output->u.ipv6.src)) 912 return -EMSGSIZE; 913 if (!ipv6_addr_any(&output->u.ipv6.dst) && 914 nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_DST, 915 &output->u.ipv6.dst)) 916 return -EMSGSIZE; 917 break; 918 } 919 if (output->tos && 920 nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->tos)) 921 return -EMSGSIZE; 922 if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ttl)) 923 return -EMSGSIZE; 924 if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, output->tun_flags) && 925 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT)) 926 return -EMSGSIZE; 927 if (test_bit(IP_TUNNEL_CSUM_BIT, output->tun_flags) && 928 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM)) 929 return -EMSGSIZE; 930 if (output->tp_src && 931 nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_SRC, output->tp_src)) 932 return -EMSGSIZE; 933 if (output->tp_dst && 934 nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_DST, output->tp_dst)) 935 return -EMSGSIZE; 936 if (test_bit(IP_TUNNEL_OAM_BIT, output->tun_flags) && 937 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM)) 938 return -EMSGSIZE; 939 if (swkey_tun_opts_len) { 940 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, output->tun_flags) && 941 nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS, 942 swkey_tun_opts_len, tun_opts)) 943 return -EMSGSIZE; 944 else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, 945 output->tun_flags) && 946 vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len)) 947 return -EMSGSIZE; 948 else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, 949 output->tun_flags) && 950 nla_put(skb, OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS, 951 swkey_tun_opts_len, tun_opts)) 952 return -EMSGSIZE; 953 } 954 955 return 0; 956 } 957 958 static int ip_tun_to_nlattr(struct sk_buff *skb, 959 const struct ip_tunnel_key *output, 960 const void *tun_opts, int swkey_tun_opts_len, 961 unsigned short tun_proto, u8 mode) 962 { 963 struct nlattr *nla; 964 int err; 965 966 nla = nla_nest_start_noflag(skb, OVS_KEY_ATTR_TUNNEL); 967 if (!nla) 968 return -EMSGSIZE; 969 970 err = __ip_tun_to_nlattr(skb, output, tun_opts, swkey_tun_opts_len, 971 tun_proto, mode); 972 if (err) 973 return err; 974 975 nla_nest_end(skb, nla); 976 return 0; 977 } 978 979 int ovs_nla_put_tunnel_info(struct sk_buff *skb, 980 struct ip_tunnel_info *tun_info) 981 { 982 return __ip_tun_to_nlattr(skb, &tun_info->key, 983 ip_tunnel_info_opts(tun_info), 984 tun_info->options_len, 985 ip_tunnel_info_af(tun_info), tun_info->mode); 986 } 987 988 static int encode_vlan_from_nlattrs(struct sw_flow_match *match, 989 const struct nlattr *a[], 990 bool is_mask, bool inner) 991 { 992 __be16 tci = 0; 993 __be16 tpid = 0; 994 995 if (a[OVS_KEY_ATTR_VLAN]) 996 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); 997 998 if (a[OVS_KEY_ATTR_ETHERTYPE]) 999 tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); 1000 1001 if (likely(!inner)) { 1002 SW_FLOW_KEY_PUT(match, eth.vlan.tpid, tpid, is_mask); 1003 SW_FLOW_KEY_PUT(match, eth.vlan.tci, tci, is_mask); 1004 } else { 1005 SW_FLOW_KEY_PUT(match, eth.cvlan.tpid, tpid, is_mask); 1006 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, tci, is_mask); 1007 } 1008 return 0; 1009 } 1010 1011 static int validate_vlan_from_nlattrs(const struct sw_flow_match *match, 1012 u64 key_attrs, bool inner, 1013 const struct nlattr **a, bool log) 1014 { 1015 __be16 tci = 0; 1016 1017 if (!((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) && 1018 (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) && 1019 eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE])))) { 1020 /* Not a VLAN. */ 1021 return 0; 1022 } 1023 1024 if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) && 1025 (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) { 1026 OVS_NLERR(log, "Invalid %s frame", (inner) ? "C-VLAN" : "VLAN"); 1027 return -EINVAL; 1028 } 1029 1030 if (a[OVS_KEY_ATTR_VLAN]) 1031 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); 1032 1033 if (!(tci & htons(VLAN_CFI_MASK))) { 1034 if (tci) { 1035 OVS_NLERR(log, "%s TCI does not have VLAN_CFI_MASK bit set.", 1036 (inner) ? "C-VLAN" : "VLAN"); 1037 return -EINVAL; 1038 } else if (nla_len(a[OVS_KEY_ATTR_ENCAP])) { 1039 /* Corner case for truncated VLAN header. */ 1040 OVS_NLERR(log, "Truncated %s header has non-zero encap attribute.", 1041 (inner) ? "C-VLAN" : "VLAN"); 1042 return -EINVAL; 1043 } 1044 } 1045 1046 return 1; 1047 } 1048 1049 static int validate_vlan_mask_from_nlattrs(const struct sw_flow_match *match, 1050 u64 key_attrs, bool inner, 1051 const struct nlattr **a, bool log) 1052 { 1053 __be16 tci = 0; 1054 __be16 tpid = 0; 1055 bool encap_valid = !!(match->key->eth.vlan.tci & 1056 htons(VLAN_CFI_MASK)); 1057 bool i_encap_valid = !!(match->key->eth.cvlan.tci & 1058 htons(VLAN_CFI_MASK)); 1059 1060 if (!(key_attrs & (1 << OVS_KEY_ATTR_ENCAP))) { 1061 /* Not a VLAN. */ 1062 return 0; 1063 } 1064 1065 if ((!inner && !encap_valid) || (inner && !i_encap_valid)) { 1066 OVS_NLERR(log, "Encap mask attribute is set for non-%s frame.", 1067 (inner) ? "C-VLAN" : "VLAN"); 1068 return -EINVAL; 1069 } 1070 1071 if (a[OVS_KEY_ATTR_VLAN]) 1072 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); 1073 1074 if (a[OVS_KEY_ATTR_ETHERTYPE]) 1075 tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); 1076 1077 if (tpid != htons(0xffff)) { 1078 OVS_NLERR(log, "Must have an exact match on %s TPID (mask=%x).", 1079 (inner) ? "C-VLAN" : "VLAN", ntohs(tpid)); 1080 return -EINVAL; 1081 } 1082 if (!(tci & htons(VLAN_CFI_MASK))) { 1083 OVS_NLERR(log, "%s TCI mask does not have exact match for VLAN_CFI_MASK bit.", 1084 (inner) ? "C-VLAN" : "VLAN"); 1085 return -EINVAL; 1086 } 1087 1088 return 1; 1089 } 1090 1091 static int __parse_vlan_from_nlattrs(struct sw_flow_match *match, 1092 u64 *key_attrs, bool inner, 1093 const struct nlattr **a, bool is_mask, 1094 bool log) 1095 { 1096 int err; 1097 const struct nlattr *encap; 1098 1099 if (!is_mask) 1100 err = validate_vlan_from_nlattrs(match, *key_attrs, inner, 1101 a, log); 1102 else 1103 err = validate_vlan_mask_from_nlattrs(match, *key_attrs, inner, 1104 a, log); 1105 if (err <= 0) 1106 return err; 1107 1108 err = encode_vlan_from_nlattrs(match, a, is_mask, inner); 1109 if (err) 1110 return err; 1111 1112 *key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP); 1113 *key_attrs &= ~(1 << OVS_KEY_ATTR_VLAN); 1114 *key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); 1115 1116 encap = a[OVS_KEY_ATTR_ENCAP]; 1117 1118 if (!is_mask) 1119 err = parse_flow_nlattrs(encap, a, key_attrs, log); 1120 else 1121 err = parse_flow_mask_nlattrs(encap, a, key_attrs, log); 1122 1123 return err; 1124 } 1125 1126 static int parse_vlan_from_nlattrs(struct sw_flow_match *match, 1127 u64 *key_attrs, const struct nlattr **a, 1128 bool is_mask, bool log) 1129 { 1130 int err; 1131 bool encap_valid = false; 1132 1133 err = __parse_vlan_from_nlattrs(match, key_attrs, false, a, 1134 is_mask, log); 1135 if (err) 1136 return err; 1137 1138 encap_valid = !!(match->key->eth.vlan.tci & htons(VLAN_CFI_MASK)); 1139 if (encap_valid) { 1140 err = __parse_vlan_from_nlattrs(match, key_attrs, true, a, 1141 is_mask, log); 1142 if (err) 1143 return err; 1144 } 1145 1146 return 0; 1147 } 1148 1149 static int parse_eth_type_from_nlattrs(struct sw_flow_match *match, 1150 u64 *attrs, const struct nlattr **a, 1151 bool is_mask, bool log) 1152 { 1153 __be16 eth_type; 1154 1155 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); 1156 if (is_mask) { 1157 /* Always exact match EtherType. */ 1158 eth_type = htons(0xffff); 1159 } else if (!eth_proto_is_802_3(eth_type)) { 1160 OVS_NLERR(log, "EtherType %x is less than min %x", 1161 ntohs(eth_type), ETH_P_802_3_MIN); 1162 return -EINVAL; 1163 } 1164 1165 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask); 1166 *attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); 1167 return 0; 1168 } 1169 1170 static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match, 1171 u64 *attrs, const struct nlattr **a, 1172 bool is_mask, bool log) 1173 { 1174 u8 mac_proto = MAC_PROTO_ETHERNET; 1175 1176 if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) { 1177 u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]); 1178 1179 SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask); 1180 *attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH); 1181 } 1182 1183 if (*attrs & (1 << OVS_KEY_ATTR_RECIRC_ID)) { 1184 u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]); 1185 1186 SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask); 1187 *attrs &= ~(1 << OVS_KEY_ATTR_RECIRC_ID); 1188 } 1189 1190 if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) { 1191 SW_FLOW_KEY_PUT(match, phy.priority, 1192 nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask); 1193 *attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY); 1194 } 1195 1196 if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) { 1197 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]); 1198 1199 if (is_mask) { 1200 in_port = 0xffffffff; /* Always exact match in_port. */ 1201 } else if (in_port >= DP_MAX_PORTS) { 1202 OVS_NLERR(log, "Port %d exceeds max allowable %d", 1203 in_port, DP_MAX_PORTS); 1204 return -EINVAL; 1205 } 1206 1207 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask); 1208 *attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT); 1209 } else if (!is_mask) { 1210 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask); 1211 } 1212 1213 if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) { 1214 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]); 1215 1216 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask); 1217 *attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK); 1218 } 1219 if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) { 1220 if (ip_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match, 1221 is_mask, log) < 0) 1222 return -EINVAL; 1223 *attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL); 1224 } 1225 1226 if (*attrs & (1 << OVS_KEY_ATTR_CT_STATE) && 1227 ovs_ct_verify(net, OVS_KEY_ATTR_CT_STATE)) { 1228 u32 ct_state = nla_get_u32(a[OVS_KEY_ATTR_CT_STATE]); 1229 1230 if (ct_state & ~CT_SUPPORTED_MASK) { 1231 OVS_NLERR(log, "ct_state flags %08x unsupported", 1232 ct_state); 1233 return -EINVAL; 1234 } 1235 1236 SW_FLOW_KEY_PUT(match, ct_state, ct_state, is_mask); 1237 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_STATE); 1238 } 1239 if (*attrs & (1 << OVS_KEY_ATTR_CT_ZONE) && 1240 ovs_ct_verify(net, OVS_KEY_ATTR_CT_ZONE)) { 1241 u16 ct_zone = nla_get_u16(a[OVS_KEY_ATTR_CT_ZONE]); 1242 1243 SW_FLOW_KEY_PUT(match, ct_zone, ct_zone, is_mask); 1244 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ZONE); 1245 } 1246 if (*attrs & (1 << OVS_KEY_ATTR_CT_MARK) && 1247 ovs_ct_verify(net, OVS_KEY_ATTR_CT_MARK)) { 1248 u32 mark = nla_get_u32(a[OVS_KEY_ATTR_CT_MARK]); 1249 1250 SW_FLOW_KEY_PUT(match, ct.mark, mark, is_mask); 1251 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_MARK); 1252 } 1253 if (*attrs & (1 << OVS_KEY_ATTR_CT_LABELS) && 1254 ovs_ct_verify(net, OVS_KEY_ATTR_CT_LABELS)) { 1255 const struct ovs_key_ct_labels *cl; 1256 1257 cl = nla_data(a[OVS_KEY_ATTR_CT_LABELS]); 1258 SW_FLOW_KEY_MEMCPY(match, ct.labels, cl->ct_labels, 1259 sizeof(*cl), is_mask); 1260 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_LABELS); 1261 } 1262 if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)) { 1263 const struct ovs_key_ct_tuple_ipv4 *ct; 1264 1265 ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4]); 1266 1267 SW_FLOW_KEY_PUT(match, ipv4.ct_orig.src, ct->ipv4_src, is_mask); 1268 SW_FLOW_KEY_PUT(match, ipv4.ct_orig.dst, ct->ipv4_dst, is_mask); 1269 SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask); 1270 SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask); 1271 SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv4_proto, is_mask); 1272 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4); 1273 } 1274 if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)) { 1275 const struct ovs_key_ct_tuple_ipv6 *ct; 1276 1277 ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6]); 1278 1279 SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.src, &ct->ipv6_src, 1280 sizeof(match->key->ipv6.ct_orig.src), 1281 is_mask); 1282 SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.dst, &ct->ipv6_dst, 1283 sizeof(match->key->ipv6.ct_orig.dst), 1284 is_mask); 1285 SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask); 1286 SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask); 1287 SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv6_proto, is_mask); 1288 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6); 1289 } 1290 1291 /* For layer 3 packets the Ethernet type is provided 1292 * and treated as metadata but no MAC addresses are provided. 1293 */ 1294 if (!(*attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) && 1295 (*attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE))) 1296 mac_proto = MAC_PROTO_NONE; 1297 1298 /* Always exact match mac_proto */ 1299 SW_FLOW_KEY_PUT(match, mac_proto, is_mask ? 0xff : mac_proto, is_mask); 1300 1301 if (mac_proto == MAC_PROTO_NONE) 1302 return parse_eth_type_from_nlattrs(match, attrs, a, is_mask, 1303 log); 1304 1305 return 0; 1306 } 1307 1308 int nsh_hdr_from_nlattr(const struct nlattr *attr, 1309 struct nshhdr *nh, size_t size) 1310 { 1311 struct nlattr *a; 1312 int rem; 1313 u8 flags = 0; 1314 u8 ttl = 0; 1315 int mdlen = 0; 1316 1317 /* validate_nsh has check this, so we needn't do duplicate check here 1318 */ 1319 if (size < NSH_BASE_HDR_LEN) 1320 return -ENOBUFS; 1321 1322 nla_for_each_nested(a, attr, rem) { 1323 int type = nla_type(a); 1324 1325 switch (type) { 1326 case OVS_NSH_KEY_ATTR_BASE: { 1327 const struct ovs_nsh_key_base *base = nla_data(a); 1328 1329 flags = base->flags; 1330 ttl = base->ttl; 1331 nh->np = base->np; 1332 nh->mdtype = base->mdtype; 1333 nh->path_hdr = base->path_hdr; 1334 break; 1335 } 1336 case OVS_NSH_KEY_ATTR_MD1: 1337 mdlen = nla_len(a); 1338 if (mdlen > size - NSH_BASE_HDR_LEN) 1339 return -ENOBUFS; 1340 memcpy(&nh->md1, nla_data(a), mdlen); 1341 break; 1342 1343 case OVS_NSH_KEY_ATTR_MD2: 1344 mdlen = nla_len(a); 1345 if (mdlen > size - NSH_BASE_HDR_LEN) 1346 return -ENOBUFS; 1347 memcpy(&nh->md2, nla_data(a), mdlen); 1348 break; 1349 1350 default: 1351 return -EINVAL; 1352 } 1353 } 1354 1355 /* nsh header length = NSH_BASE_HDR_LEN + mdlen */ 1356 nh->ver_flags_ttl_len = 0; 1357 nsh_set_flags_ttl_len(nh, flags, ttl, NSH_BASE_HDR_LEN + mdlen); 1358 1359 return 0; 1360 } 1361 1362 int nsh_key_from_nlattr(const struct nlattr *attr, 1363 struct ovs_key_nsh *nsh, struct ovs_key_nsh *nsh_mask) 1364 { 1365 struct nlattr *a; 1366 int rem; 1367 1368 /* validate_nsh has check this, so we needn't do duplicate check here 1369 */ 1370 nla_for_each_nested(a, attr, rem) { 1371 int type = nla_type(a); 1372 1373 switch (type) { 1374 case OVS_NSH_KEY_ATTR_BASE: { 1375 const struct ovs_nsh_key_base *base = nla_data(a); 1376 const struct ovs_nsh_key_base *base_mask = base + 1; 1377 1378 nsh->base = *base; 1379 nsh_mask->base = *base_mask; 1380 break; 1381 } 1382 case OVS_NSH_KEY_ATTR_MD1: { 1383 const struct ovs_nsh_key_md1 *md1 = nla_data(a); 1384 const struct ovs_nsh_key_md1 *md1_mask = md1 + 1; 1385 1386 memcpy(nsh->context, md1->context, sizeof(*md1)); 1387 memcpy(nsh_mask->context, md1_mask->context, 1388 sizeof(*md1_mask)); 1389 break; 1390 } 1391 case OVS_NSH_KEY_ATTR_MD2: 1392 /* Not supported yet */ 1393 return -ENOTSUPP; 1394 default: 1395 return -EINVAL; 1396 } 1397 } 1398 1399 return 0; 1400 } 1401 1402 static int nsh_key_put_from_nlattr(const struct nlattr *attr, 1403 struct sw_flow_match *match, bool is_mask, 1404 bool is_push_nsh, bool log) 1405 { 1406 struct nlattr *a; 1407 int rem; 1408 bool has_base = false; 1409 bool has_md1 = false; 1410 bool has_md2 = false; 1411 u8 mdtype = 0; 1412 int mdlen = 0; 1413 1414 if (WARN_ON(is_push_nsh && is_mask)) 1415 return -EINVAL; 1416 1417 nla_for_each_nested(a, attr, rem) { 1418 int type = nla_type(a); 1419 int i; 1420 1421 if (type > OVS_NSH_KEY_ATTR_MAX) { 1422 OVS_NLERR(log, "nsh attr %d is out of range max %d", 1423 type, OVS_NSH_KEY_ATTR_MAX); 1424 return -EINVAL; 1425 } 1426 1427 if (!check_attr_len(nla_len(a), 1428 ovs_nsh_key_attr_lens[type].len)) { 1429 OVS_NLERR( 1430 log, 1431 "nsh attr %d has unexpected len %d expected %d", 1432 type, 1433 nla_len(a), 1434 ovs_nsh_key_attr_lens[type].len 1435 ); 1436 return -EINVAL; 1437 } 1438 1439 switch (type) { 1440 case OVS_NSH_KEY_ATTR_BASE: { 1441 const struct ovs_nsh_key_base *base = nla_data(a); 1442 1443 has_base = true; 1444 mdtype = base->mdtype; 1445 SW_FLOW_KEY_PUT(match, nsh.base.flags, 1446 base->flags, is_mask); 1447 SW_FLOW_KEY_PUT(match, nsh.base.ttl, 1448 base->ttl, is_mask); 1449 SW_FLOW_KEY_PUT(match, nsh.base.mdtype, 1450 base->mdtype, is_mask); 1451 SW_FLOW_KEY_PUT(match, nsh.base.np, 1452 base->np, is_mask); 1453 SW_FLOW_KEY_PUT(match, nsh.base.path_hdr, 1454 base->path_hdr, is_mask); 1455 break; 1456 } 1457 case OVS_NSH_KEY_ATTR_MD1: { 1458 const struct ovs_nsh_key_md1 *md1 = nla_data(a); 1459 1460 has_md1 = true; 1461 for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) 1462 SW_FLOW_KEY_PUT(match, nsh.context[i], 1463 md1->context[i], is_mask); 1464 break; 1465 } 1466 case OVS_NSH_KEY_ATTR_MD2: 1467 if (!is_push_nsh) /* Not supported MD type 2 yet */ 1468 return -ENOTSUPP; 1469 1470 has_md2 = true; 1471 mdlen = nla_len(a); 1472 if (mdlen > NSH_CTX_HDRS_MAX_LEN || mdlen <= 0) { 1473 OVS_NLERR( 1474 log, 1475 "Invalid MD length %d for MD type %d", 1476 mdlen, 1477 mdtype 1478 ); 1479 return -EINVAL; 1480 } 1481 break; 1482 default: 1483 OVS_NLERR(log, "Unknown nsh attribute %d", 1484 type); 1485 return -EINVAL; 1486 } 1487 } 1488 1489 if (rem > 0) { 1490 OVS_NLERR(log, "nsh attribute has %d unknown bytes.", rem); 1491 return -EINVAL; 1492 } 1493 1494 if (has_md1 && has_md2) { 1495 OVS_NLERR( 1496 1, 1497 "invalid nsh attribute: md1 and md2 are exclusive." 1498 ); 1499 return -EINVAL; 1500 } 1501 1502 if (!is_mask) { 1503 if ((has_md1 && mdtype != NSH_M_TYPE1) || 1504 (has_md2 && mdtype != NSH_M_TYPE2)) { 1505 OVS_NLERR(1, "nsh attribute has unmatched MD type %d.", 1506 mdtype); 1507 return -EINVAL; 1508 } 1509 1510 if (is_push_nsh && 1511 (!has_base || (!has_md1 && !has_md2))) { 1512 OVS_NLERR( 1513 1, 1514 "push_nsh: missing base or metadata attributes" 1515 ); 1516 return -EINVAL; 1517 } 1518 } 1519 1520 return 0; 1521 } 1522 1523 static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match, 1524 u64 attrs, const struct nlattr **a, 1525 bool is_mask, bool log) 1526 { 1527 int err; 1528 1529 err = metadata_from_nlattrs(net, match, &attrs, a, is_mask, log); 1530 if (err) 1531 return err; 1532 1533 if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) { 1534 const struct ovs_key_ethernet *eth_key; 1535 1536 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]); 1537 SW_FLOW_KEY_MEMCPY(match, eth.src, 1538 eth_key->eth_src, ETH_ALEN, is_mask); 1539 SW_FLOW_KEY_MEMCPY(match, eth.dst, 1540 eth_key->eth_dst, ETH_ALEN, is_mask); 1541 attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET); 1542 1543 if (attrs & (1 << OVS_KEY_ATTR_VLAN)) { 1544 /* VLAN attribute is always parsed before getting here since it 1545 * may occur multiple times. 1546 */ 1547 OVS_NLERR(log, "VLAN attribute unexpected."); 1548 return -EINVAL; 1549 } 1550 1551 if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) { 1552 err = parse_eth_type_from_nlattrs(match, &attrs, a, is_mask, 1553 log); 1554 if (err) 1555 return err; 1556 } else if (!is_mask) { 1557 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask); 1558 } 1559 } else if (!match->key->eth.type) { 1560 OVS_NLERR(log, "Either Ethernet header or EtherType is required."); 1561 return -EINVAL; 1562 } 1563 1564 if (attrs & (1 << OVS_KEY_ATTR_IPV4)) { 1565 const struct ovs_key_ipv4 *ipv4_key; 1566 1567 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]); 1568 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) { 1569 OVS_NLERR(log, "IPv4 frag type %d is out of range max %d", 1570 ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX); 1571 return -EINVAL; 1572 } 1573 SW_FLOW_KEY_PUT(match, ip.proto, 1574 ipv4_key->ipv4_proto, is_mask); 1575 SW_FLOW_KEY_PUT(match, ip.tos, 1576 ipv4_key->ipv4_tos, is_mask); 1577 SW_FLOW_KEY_PUT(match, ip.ttl, 1578 ipv4_key->ipv4_ttl, is_mask); 1579 SW_FLOW_KEY_PUT(match, ip.frag, 1580 ipv4_key->ipv4_frag, is_mask); 1581 SW_FLOW_KEY_PUT(match, ipv4.addr.src, 1582 ipv4_key->ipv4_src, is_mask); 1583 SW_FLOW_KEY_PUT(match, ipv4.addr.dst, 1584 ipv4_key->ipv4_dst, is_mask); 1585 attrs &= ~(1 << OVS_KEY_ATTR_IPV4); 1586 } 1587 1588 if (attrs & (1 << OVS_KEY_ATTR_IPV6)) { 1589 const struct ovs_key_ipv6 *ipv6_key; 1590 1591 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]); 1592 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) { 1593 OVS_NLERR(log, "IPv6 frag type %d is out of range max %d", 1594 ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX); 1595 return -EINVAL; 1596 } 1597 1598 if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) { 1599 OVS_NLERR(log, "IPv6 flow label %x is out of range (max=%x)", 1600 ntohl(ipv6_key->ipv6_label), (1 << 20) - 1); 1601 return -EINVAL; 1602 } 1603 1604 SW_FLOW_KEY_PUT(match, ipv6.label, 1605 ipv6_key->ipv6_label, is_mask); 1606 SW_FLOW_KEY_PUT(match, ip.proto, 1607 ipv6_key->ipv6_proto, is_mask); 1608 SW_FLOW_KEY_PUT(match, ip.tos, 1609 ipv6_key->ipv6_tclass, is_mask); 1610 SW_FLOW_KEY_PUT(match, ip.ttl, 1611 ipv6_key->ipv6_hlimit, is_mask); 1612 SW_FLOW_KEY_PUT(match, ip.frag, 1613 ipv6_key->ipv6_frag, is_mask); 1614 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src, 1615 ipv6_key->ipv6_src, 1616 sizeof(match->key->ipv6.addr.src), 1617 is_mask); 1618 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst, 1619 ipv6_key->ipv6_dst, 1620 sizeof(match->key->ipv6.addr.dst), 1621 is_mask); 1622 1623 attrs &= ~(1 << OVS_KEY_ATTR_IPV6); 1624 } 1625 1626 if (attrs & (1ULL << OVS_KEY_ATTR_IPV6_EXTHDRS)) { 1627 const struct ovs_key_ipv6_exthdrs *ipv6_exthdrs_key; 1628 1629 ipv6_exthdrs_key = nla_data(a[OVS_KEY_ATTR_IPV6_EXTHDRS]); 1630 1631 SW_FLOW_KEY_PUT(match, ipv6.exthdrs, 1632 ipv6_exthdrs_key->hdrs, is_mask); 1633 1634 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6_EXTHDRS); 1635 } 1636 1637 if (attrs & (1 << OVS_KEY_ATTR_ARP)) { 1638 const struct ovs_key_arp *arp_key; 1639 1640 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]); 1641 if (!is_mask && (arp_key->arp_op & htons(0xff00))) { 1642 OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).", 1643 arp_key->arp_op); 1644 return -EINVAL; 1645 } 1646 1647 SW_FLOW_KEY_PUT(match, ipv4.addr.src, 1648 arp_key->arp_sip, is_mask); 1649 SW_FLOW_KEY_PUT(match, ipv4.addr.dst, 1650 arp_key->arp_tip, is_mask); 1651 SW_FLOW_KEY_PUT(match, ip.proto, 1652 ntohs(arp_key->arp_op), is_mask); 1653 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha, 1654 arp_key->arp_sha, ETH_ALEN, is_mask); 1655 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha, 1656 arp_key->arp_tha, ETH_ALEN, is_mask); 1657 1658 attrs &= ~(1 << OVS_KEY_ATTR_ARP); 1659 } 1660 1661 if (attrs & (1 << OVS_KEY_ATTR_NSH)) { 1662 if (nsh_key_put_from_nlattr(a[OVS_KEY_ATTR_NSH], match, 1663 is_mask, false, log) < 0) 1664 return -EINVAL; 1665 attrs &= ~(1 << OVS_KEY_ATTR_NSH); 1666 } 1667 1668 if (attrs & (1 << OVS_KEY_ATTR_MPLS)) { 1669 const struct ovs_key_mpls *mpls_key; 1670 u32 hdr_len; 1671 u32 label_count, label_count_mask, i; 1672 1673 mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]); 1674 hdr_len = nla_len(a[OVS_KEY_ATTR_MPLS]); 1675 label_count = hdr_len / sizeof(struct ovs_key_mpls); 1676 1677 if (label_count == 0 || label_count > MPLS_LABEL_DEPTH || 1678 hdr_len % sizeof(struct ovs_key_mpls)) 1679 return -EINVAL; 1680 1681 label_count_mask = GENMASK(label_count - 1, 0); 1682 1683 for (i = 0 ; i < label_count; i++) 1684 SW_FLOW_KEY_PUT(match, mpls.lse[i], 1685 mpls_key[i].mpls_lse, is_mask); 1686 1687 SW_FLOW_KEY_PUT(match, mpls.num_labels_mask, 1688 label_count_mask, is_mask); 1689 1690 attrs &= ~(1 << OVS_KEY_ATTR_MPLS); 1691 } 1692 1693 if (attrs & (1 << OVS_KEY_ATTR_TCP)) { 1694 const struct ovs_key_tcp *tcp_key; 1695 1696 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); 1697 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask); 1698 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask); 1699 attrs &= ~(1 << OVS_KEY_ATTR_TCP); 1700 } 1701 1702 if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) { 1703 SW_FLOW_KEY_PUT(match, tp.flags, 1704 nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]), 1705 is_mask); 1706 attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS); 1707 } 1708 1709 if (attrs & (1 << OVS_KEY_ATTR_UDP)) { 1710 const struct ovs_key_udp *udp_key; 1711 1712 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); 1713 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask); 1714 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask); 1715 attrs &= ~(1 << OVS_KEY_ATTR_UDP); 1716 } 1717 1718 if (attrs & (1 << OVS_KEY_ATTR_SCTP)) { 1719 const struct ovs_key_sctp *sctp_key; 1720 1721 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]); 1722 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask); 1723 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask); 1724 attrs &= ~(1 << OVS_KEY_ATTR_SCTP); 1725 } 1726 1727 if (attrs & (1 << OVS_KEY_ATTR_ICMP)) { 1728 const struct ovs_key_icmp *icmp_key; 1729 1730 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]); 1731 SW_FLOW_KEY_PUT(match, tp.src, 1732 htons(icmp_key->icmp_type), is_mask); 1733 SW_FLOW_KEY_PUT(match, tp.dst, 1734 htons(icmp_key->icmp_code), is_mask); 1735 attrs &= ~(1 << OVS_KEY_ATTR_ICMP); 1736 } 1737 1738 if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) { 1739 const struct ovs_key_icmpv6 *icmpv6_key; 1740 1741 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]); 1742 SW_FLOW_KEY_PUT(match, tp.src, 1743 htons(icmpv6_key->icmpv6_type), is_mask); 1744 SW_FLOW_KEY_PUT(match, tp.dst, 1745 htons(icmpv6_key->icmpv6_code), is_mask); 1746 attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6); 1747 } 1748 1749 if (attrs & (1 << OVS_KEY_ATTR_ND)) { 1750 const struct ovs_key_nd *nd_key; 1751 1752 nd_key = nla_data(a[OVS_KEY_ATTR_ND]); 1753 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target, 1754 nd_key->nd_target, 1755 sizeof(match->key->ipv6.nd.target), 1756 is_mask); 1757 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll, 1758 nd_key->nd_sll, ETH_ALEN, is_mask); 1759 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll, 1760 nd_key->nd_tll, ETH_ALEN, is_mask); 1761 attrs &= ~(1 << OVS_KEY_ATTR_ND); 1762 } 1763 1764 if (attrs != 0) { 1765 OVS_NLERR(log, "Unknown key attributes %llx", 1766 (unsigned long long)attrs); 1767 return -EINVAL; 1768 } 1769 1770 return 0; 1771 } 1772 1773 static void nlattr_set(struct nlattr *attr, u8 val, 1774 const struct ovs_len_tbl *tbl) 1775 { 1776 struct nlattr *nla; 1777 int rem; 1778 1779 /* The nlattr stream should already have been validated */ 1780 nla_for_each_nested(nla, attr, rem) { 1781 if (tbl[nla_type(nla)].len == OVS_ATTR_NESTED) 1782 nlattr_set(nla, val, tbl[nla_type(nla)].next ? : tbl); 1783 else 1784 memset(nla_data(nla), val, nla_len(nla)); 1785 1786 if (nla_type(nla) == OVS_KEY_ATTR_CT_STATE) 1787 *(u32 *)nla_data(nla) &= CT_SUPPORTED_MASK; 1788 } 1789 } 1790 1791 static void mask_set_nlattr(struct nlattr *attr, u8 val) 1792 { 1793 nlattr_set(attr, val, ovs_key_lens); 1794 } 1795 1796 /** 1797 * ovs_nla_get_match - parses Netlink attributes into a flow key and 1798 * mask. In case the 'mask' is NULL, the flow is treated as exact match 1799 * flow. Otherwise, it is treated as a wildcarded flow, except the mask 1800 * does not include any don't care bit. 1801 * @net: Used to determine per-namespace field support. 1802 * @match: receives the extracted flow match information. 1803 * @nla_key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute 1804 * sequence. The fields should of the packet that triggered the creation 1805 * of this flow. 1806 * @nla_mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* 1807 * Netlink attribute specifies the mask field of the wildcarded flow. 1808 * @log: Boolean to allow kernel error logging. Normally true, but when 1809 * probing for feature compatibility this should be passed in as false to 1810 * suppress unnecessary error logging. 1811 */ 1812 int ovs_nla_get_match(struct net *net, struct sw_flow_match *match, 1813 const struct nlattr *nla_key, 1814 const struct nlattr *nla_mask, 1815 bool log) 1816 { 1817 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; 1818 struct nlattr *newmask = NULL; 1819 u64 key_attrs = 0; 1820 u64 mask_attrs = 0; 1821 int err; 1822 1823 err = parse_flow_nlattrs(nla_key, a, &key_attrs, log); 1824 if (err) 1825 return err; 1826 1827 err = parse_vlan_from_nlattrs(match, &key_attrs, a, false, log); 1828 if (err) 1829 return err; 1830 1831 err = ovs_key_from_nlattrs(net, match, key_attrs, a, false, log); 1832 if (err) 1833 return err; 1834 1835 if (match->mask) { 1836 if (!nla_mask) { 1837 /* Create an exact match mask. We need to set to 0xff 1838 * all the 'match->mask' fields that have been touched 1839 * in 'match->key'. We cannot simply memset 1840 * 'match->mask', because padding bytes and fields not 1841 * specified in 'match->key' should be left to 0. 1842 * Instead, we use a stream of netlink attributes, 1843 * copied from 'key' and set to 0xff. 1844 * ovs_key_from_nlattrs() will take care of filling 1845 * 'match->mask' appropriately. 1846 */ 1847 newmask = kmemdup(nla_key, 1848 nla_total_size(nla_len(nla_key)), 1849 GFP_KERNEL); 1850 if (!newmask) 1851 return -ENOMEM; 1852 1853 mask_set_nlattr(newmask, 0xff); 1854 1855 /* The userspace does not send tunnel attributes that 1856 * are 0, but we should not wildcard them nonetheless. 1857 */ 1858 if (match->key->tun_proto) 1859 SW_FLOW_KEY_MEMSET_FIELD(match, tun_key, 1860 0xff, true); 1861 1862 nla_mask = newmask; 1863 } 1864 1865 err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log); 1866 if (err) 1867 goto free_newmask; 1868 1869 /* Always match on tci. */ 1870 SW_FLOW_KEY_PUT(match, eth.vlan.tci, htons(0xffff), true); 1871 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, htons(0xffff), true); 1872 1873 err = parse_vlan_from_nlattrs(match, &mask_attrs, a, true, log); 1874 if (err) 1875 goto free_newmask; 1876 1877 err = ovs_key_from_nlattrs(net, match, mask_attrs, a, true, 1878 log); 1879 if (err) 1880 goto free_newmask; 1881 } 1882 1883 if (!match_validate(match, key_attrs, mask_attrs, log)) 1884 err = -EINVAL; 1885 1886 free_newmask: 1887 kfree(newmask); 1888 return err; 1889 } 1890 1891 static size_t get_ufid_len(const struct nlattr *attr, bool log) 1892 { 1893 size_t len; 1894 1895 if (!attr) 1896 return 0; 1897 1898 len = nla_len(attr); 1899 if (len < 1 || len > MAX_UFID_LENGTH) { 1900 OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)", 1901 nla_len(attr), MAX_UFID_LENGTH); 1902 return 0; 1903 } 1904 1905 return len; 1906 } 1907 1908 /* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID, 1909 * or false otherwise. 1910 */ 1911 bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr, 1912 bool log) 1913 { 1914 sfid->ufid_len = get_ufid_len(attr, log); 1915 if (sfid->ufid_len) 1916 memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len); 1917 1918 return sfid->ufid_len; 1919 } 1920 1921 int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid, 1922 const struct sw_flow_key *key, bool log) 1923 { 1924 struct sw_flow_key *new_key; 1925 1926 if (ovs_nla_get_ufid(sfid, ufid, log)) 1927 return 0; 1928 1929 /* If UFID was not provided, use unmasked key. */ 1930 new_key = kmalloc(sizeof(*new_key), GFP_KERNEL); 1931 if (!new_key) 1932 return -ENOMEM; 1933 memcpy(new_key, key, sizeof(*key)); 1934 sfid->unmasked_key = new_key; 1935 1936 return 0; 1937 } 1938 1939 u32 ovs_nla_get_ufid_flags(const struct nlattr *attr) 1940 { 1941 return attr ? nla_get_u32(attr) : 0; 1942 } 1943 1944 /** 1945 * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key. 1946 * @net: Network namespace. 1947 * @key: Receives extracted in_port, priority, tun_key, skb_mark and conntrack 1948 * metadata. 1949 * @a: Array of netlink attributes holding parsed %OVS_KEY_ATTR_* Netlink 1950 * attributes. 1951 * @attrs: Bit mask for the netlink attributes included in @a. 1952 * @log: Boolean to allow kernel error logging. Normally true, but when 1953 * probing for feature compatibility this should be passed in as false to 1954 * suppress unnecessary error logging. 1955 * 1956 * This parses a series of Netlink attributes that form a flow key, which must 1957 * take the same form accepted by flow_from_nlattrs(), but only enough of it to 1958 * get the metadata, that is, the parts of the flow key that cannot be 1959 * extracted from the packet itself. 1960 * 1961 * This must be called before the packet key fields are filled in 'key'. 1962 */ 1963 1964 int ovs_nla_get_flow_metadata(struct net *net, 1965 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1], 1966 u64 attrs, struct sw_flow_key *key, bool log) 1967 { 1968 struct sw_flow_match match; 1969 1970 memset(&match, 0, sizeof(match)); 1971 match.key = key; 1972 1973 key->ct_state = 0; 1974 key->ct_zone = 0; 1975 key->ct_orig_proto = 0; 1976 memset(&key->ct, 0, sizeof(key->ct)); 1977 memset(&key->ipv4.ct_orig, 0, sizeof(key->ipv4.ct_orig)); 1978 memset(&key->ipv6.ct_orig, 0, sizeof(key->ipv6.ct_orig)); 1979 1980 key->phy.in_port = DP_MAX_PORTS; 1981 1982 return metadata_from_nlattrs(net, &match, &attrs, a, false, log); 1983 } 1984 1985 static int ovs_nla_put_vlan(struct sk_buff *skb, const struct vlan_head *vh, 1986 bool is_mask) 1987 { 1988 __be16 eth_type = !is_mask ? vh->tpid : htons(0xffff); 1989 1990 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) || 1991 nla_put_be16(skb, OVS_KEY_ATTR_VLAN, vh->tci)) 1992 return -EMSGSIZE; 1993 return 0; 1994 } 1995 1996 static int nsh_key_to_nlattr(const struct ovs_key_nsh *nsh, bool is_mask, 1997 struct sk_buff *skb) 1998 { 1999 struct nlattr *start; 2000 2001 start = nla_nest_start_noflag(skb, OVS_KEY_ATTR_NSH); 2002 if (!start) 2003 return -EMSGSIZE; 2004 2005 if (nla_put(skb, OVS_NSH_KEY_ATTR_BASE, sizeof(nsh->base), &nsh->base)) 2006 goto nla_put_failure; 2007 2008 if (is_mask || nsh->base.mdtype == NSH_M_TYPE1) { 2009 if (nla_put(skb, OVS_NSH_KEY_ATTR_MD1, 2010 sizeof(nsh->context), nsh->context)) 2011 goto nla_put_failure; 2012 } 2013 2014 /* Don't support MD type 2 yet */ 2015 2016 nla_nest_end(skb, start); 2017 2018 return 0; 2019 2020 nla_put_failure: 2021 return -EMSGSIZE; 2022 } 2023 2024 static int __ovs_nla_put_key(const struct sw_flow_key *swkey, 2025 const struct sw_flow_key *output, bool is_mask, 2026 struct sk_buff *skb) 2027 { 2028 struct ovs_key_ethernet *eth_key; 2029 struct nlattr *nla; 2030 struct nlattr *encap = NULL; 2031 struct nlattr *in_encap = NULL; 2032 2033 if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id)) 2034 goto nla_put_failure; 2035 2036 if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash)) 2037 goto nla_put_failure; 2038 2039 if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority)) 2040 goto nla_put_failure; 2041 2042 if ((swkey->tun_proto || is_mask)) { 2043 const void *opts = NULL; 2044 2045 if (ip_tunnel_is_options_present(output->tun_key.tun_flags)) 2046 opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len); 2047 2048 if (ip_tun_to_nlattr(skb, &output->tun_key, opts, 2049 swkey->tun_opts_len, swkey->tun_proto, 0)) 2050 goto nla_put_failure; 2051 } 2052 2053 if (swkey->phy.in_port == DP_MAX_PORTS) { 2054 if (is_mask && (output->phy.in_port == 0xffff)) 2055 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff)) 2056 goto nla_put_failure; 2057 } else { 2058 u16 upper_u16; 2059 upper_u16 = !is_mask ? 0 : 0xffff; 2060 2061 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 2062 (upper_u16 << 16) | output->phy.in_port)) 2063 goto nla_put_failure; 2064 } 2065 2066 if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark)) 2067 goto nla_put_failure; 2068 2069 if (ovs_ct_put_key(swkey, output, skb)) 2070 goto nla_put_failure; 2071 2072 if (ovs_key_mac_proto(swkey) == MAC_PROTO_ETHERNET) { 2073 nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key)); 2074 if (!nla) 2075 goto nla_put_failure; 2076 2077 eth_key = nla_data(nla); 2078 ether_addr_copy(eth_key->eth_src, output->eth.src); 2079 ether_addr_copy(eth_key->eth_dst, output->eth.dst); 2080 2081 if (swkey->eth.vlan.tci || eth_type_vlan(swkey->eth.type)) { 2082 if (ovs_nla_put_vlan(skb, &output->eth.vlan, is_mask)) 2083 goto nla_put_failure; 2084 encap = nla_nest_start_noflag(skb, OVS_KEY_ATTR_ENCAP); 2085 if (!swkey->eth.vlan.tci) 2086 goto unencap; 2087 2088 if (swkey->eth.cvlan.tci || eth_type_vlan(swkey->eth.type)) { 2089 if (ovs_nla_put_vlan(skb, &output->eth.cvlan, is_mask)) 2090 goto nla_put_failure; 2091 in_encap = nla_nest_start_noflag(skb, 2092 OVS_KEY_ATTR_ENCAP); 2093 if (!swkey->eth.cvlan.tci) 2094 goto unencap; 2095 } 2096 } 2097 2098 if (swkey->eth.type == htons(ETH_P_802_2)) { 2099 /* 2100 * Ethertype 802.2 is represented in the netlink with omitted 2101 * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and 2102 * 0xffff in the mask attribute. Ethertype can also 2103 * be wildcarded. 2104 */ 2105 if (is_mask && output->eth.type) 2106 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, 2107 output->eth.type)) 2108 goto nla_put_failure; 2109 goto unencap; 2110 } 2111 } 2112 2113 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type)) 2114 goto nla_put_failure; 2115 2116 if (eth_type_vlan(swkey->eth.type)) { 2117 /* There are 3 VLAN tags, we don't know anything about the rest 2118 * of the packet, so truncate here. 2119 */ 2120 WARN_ON_ONCE(!(encap && in_encap)); 2121 goto unencap; 2122 } 2123 2124 if (swkey->eth.type == htons(ETH_P_IP)) { 2125 struct ovs_key_ipv4 *ipv4_key; 2126 2127 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key)); 2128 if (!nla) 2129 goto nla_put_failure; 2130 ipv4_key = nla_data(nla); 2131 ipv4_key->ipv4_src = output->ipv4.addr.src; 2132 ipv4_key->ipv4_dst = output->ipv4.addr.dst; 2133 ipv4_key->ipv4_proto = output->ip.proto; 2134 ipv4_key->ipv4_tos = output->ip.tos; 2135 ipv4_key->ipv4_ttl = output->ip.ttl; 2136 ipv4_key->ipv4_frag = output->ip.frag; 2137 } else if (swkey->eth.type == htons(ETH_P_IPV6)) { 2138 struct ovs_key_ipv6 *ipv6_key; 2139 struct ovs_key_ipv6_exthdrs *ipv6_exthdrs_key; 2140 2141 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key)); 2142 if (!nla) 2143 goto nla_put_failure; 2144 ipv6_key = nla_data(nla); 2145 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src, 2146 sizeof(ipv6_key->ipv6_src)); 2147 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst, 2148 sizeof(ipv6_key->ipv6_dst)); 2149 ipv6_key->ipv6_label = output->ipv6.label; 2150 ipv6_key->ipv6_proto = output->ip.proto; 2151 ipv6_key->ipv6_tclass = output->ip.tos; 2152 ipv6_key->ipv6_hlimit = output->ip.ttl; 2153 ipv6_key->ipv6_frag = output->ip.frag; 2154 2155 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6_EXTHDRS, 2156 sizeof(*ipv6_exthdrs_key)); 2157 if (!nla) 2158 goto nla_put_failure; 2159 ipv6_exthdrs_key = nla_data(nla); 2160 ipv6_exthdrs_key->hdrs = output->ipv6.exthdrs; 2161 } else if (swkey->eth.type == htons(ETH_P_NSH)) { 2162 if (nsh_key_to_nlattr(&output->nsh, is_mask, skb)) 2163 goto nla_put_failure; 2164 } else if (swkey->eth.type == htons(ETH_P_ARP) || 2165 swkey->eth.type == htons(ETH_P_RARP)) { 2166 struct ovs_key_arp *arp_key; 2167 2168 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key)); 2169 if (!nla) 2170 goto nla_put_failure; 2171 arp_key = nla_data(nla); 2172 memset(arp_key, 0, sizeof(struct ovs_key_arp)); 2173 arp_key->arp_sip = output->ipv4.addr.src; 2174 arp_key->arp_tip = output->ipv4.addr.dst; 2175 arp_key->arp_op = htons(output->ip.proto); 2176 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha); 2177 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha); 2178 } else if (eth_p_mpls(swkey->eth.type)) { 2179 u8 i, num_labels; 2180 struct ovs_key_mpls *mpls_key; 2181 2182 num_labels = hweight_long(output->mpls.num_labels_mask); 2183 nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS, 2184 num_labels * sizeof(*mpls_key)); 2185 if (!nla) 2186 goto nla_put_failure; 2187 2188 mpls_key = nla_data(nla); 2189 for (i = 0; i < num_labels; i++) 2190 mpls_key[i].mpls_lse = output->mpls.lse[i]; 2191 } 2192 2193 if ((swkey->eth.type == htons(ETH_P_IP) || 2194 swkey->eth.type == htons(ETH_P_IPV6)) && 2195 swkey->ip.frag != OVS_FRAG_TYPE_LATER) { 2196 2197 if (swkey->ip.proto == IPPROTO_TCP) { 2198 struct ovs_key_tcp *tcp_key; 2199 2200 nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key)); 2201 if (!nla) 2202 goto nla_put_failure; 2203 tcp_key = nla_data(nla); 2204 tcp_key->tcp_src = output->tp.src; 2205 tcp_key->tcp_dst = output->tp.dst; 2206 if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS, 2207 output->tp.flags)) 2208 goto nla_put_failure; 2209 } else if (swkey->ip.proto == IPPROTO_UDP) { 2210 struct ovs_key_udp *udp_key; 2211 2212 nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key)); 2213 if (!nla) 2214 goto nla_put_failure; 2215 udp_key = nla_data(nla); 2216 udp_key->udp_src = output->tp.src; 2217 udp_key->udp_dst = output->tp.dst; 2218 } else if (swkey->ip.proto == IPPROTO_SCTP) { 2219 struct ovs_key_sctp *sctp_key; 2220 2221 nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key)); 2222 if (!nla) 2223 goto nla_put_failure; 2224 sctp_key = nla_data(nla); 2225 sctp_key->sctp_src = output->tp.src; 2226 sctp_key->sctp_dst = output->tp.dst; 2227 } else if (swkey->eth.type == htons(ETH_P_IP) && 2228 swkey->ip.proto == IPPROTO_ICMP) { 2229 struct ovs_key_icmp *icmp_key; 2230 2231 nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key)); 2232 if (!nla) 2233 goto nla_put_failure; 2234 icmp_key = nla_data(nla); 2235 icmp_key->icmp_type = ntohs(output->tp.src); 2236 icmp_key->icmp_code = ntohs(output->tp.dst); 2237 } else if (swkey->eth.type == htons(ETH_P_IPV6) && 2238 swkey->ip.proto == IPPROTO_ICMPV6) { 2239 struct ovs_key_icmpv6 *icmpv6_key; 2240 2241 nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6, 2242 sizeof(*icmpv6_key)); 2243 if (!nla) 2244 goto nla_put_failure; 2245 icmpv6_key = nla_data(nla); 2246 icmpv6_key->icmpv6_type = ntohs(output->tp.src); 2247 icmpv6_key->icmpv6_code = ntohs(output->tp.dst); 2248 2249 if (swkey->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) || 2250 swkey->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) { 2251 struct ovs_key_nd *nd_key; 2252 2253 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key)); 2254 if (!nla) 2255 goto nla_put_failure; 2256 nd_key = nla_data(nla); 2257 memcpy(nd_key->nd_target, &output->ipv6.nd.target, 2258 sizeof(nd_key->nd_target)); 2259 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll); 2260 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll); 2261 } 2262 } 2263 } 2264 2265 unencap: 2266 if (in_encap) 2267 nla_nest_end(skb, in_encap); 2268 if (encap) 2269 nla_nest_end(skb, encap); 2270 2271 return 0; 2272 2273 nla_put_failure: 2274 return -EMSGSIZE; 2275 } 2276 2277 int ovs_nla_put_key(const struct sw_flow_key *swkey, 2278 const struct sw_flow_key *output, int attr, bool is_mask, 2279 struct sk_buff *skb) 2280 { 2281 int err; 2282 struct nlattr *nla; 2283 2284 nla = nla_nest_start_noflag(skb, attr); 2285 if (!nla) 2286 return -EMSGSIZE; 2287 err = __ovs_nla_put_key(swkey, output, is_mask, skb); 2288 if (err) 2289 return err; 2290 nla_nest_end(skb, nla); 2291 2292 return 0; 2293 } 2294 2295 /* Called with ovs_mutex or RCU read lock. */ 2296 int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb) 2297 { 2298 if (ovs_identifier_is_ufid(&flow->id)) 2299 return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len, 2300 flow->id.ufid); 2301 2302 return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key, 2303 OVS_FLOW_ATTR_KEY, false, skb); 2304 } 2305 2306 /* Called with ovs_mutex or RCU read lock. */ 2307 int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb) 2308 { 2309 return ovs_nla_put_key(&flow->key, &flow->key, 2310 OVS_FLOW_ATTR_KEY, false, skb); 2311 } 2312 2313 /* Called with ovs_mutex or RCU read lock. */ 2314 int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb) 2315 { 2316 return ovs_nla_put_key(&flow->key, &flow->mask->key, 2317 OVS_FLOW_ATTR_MASK, true, skb); 2318 } 2319 2320 #define MAX_ACTIONS_BUFSIZE (32 * 1024) 2321 2322 static struct sw_flow_actions *nla_alloc_flow_actions(int size) 2323 { 2324 struct sw_flow_actions *sfa; 2325 2326 WARN_ON_ONCE(size > MAX_ACTIONS_BUFSIZE); 2327 2328 sfa = kmalloc(kmalloc_size_roundup(sizeof(*sfa) + size), GFP_KERNEL); 2329 if (!sfa) 2330 return ERR_PTR(-ENOMEM); 2331 2332 sfa->actions_len = 0; 2333 return sfa; 2334 } 2335 2336 static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len); 2337 2338 static void ovs_nla_free_check_pkt_len_action(const struct nlattr *action) 2339 { 2340 const struct nlattr *a; 2341 int rem; 2342 2343 nla_for_each_nested(a, action, rem) { 2344 switch (nla_type(a)) { 2345 case OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL: 2346 case OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER: 2347 ovs_nla_free_nested_actions(nla_data(a), nla_len(a)); 2348 break; 2349 } 2350 } 2351 } 2352 2353 static void ovs_nla_free_clone_action(const struct nlattr *action) 2354 { 2355 const struct nlattr *a = nla_data(action); 2356 int rem = nla_len(action); 2357 2358 switch (nla_type(a)) { 2359 case OVS_CLONE_ATTR_EXEC: 2360 /* The real list of actions follows this attribute. */ 2361 a = nla_next(a, &rem); 2362 ovs_nla_free_nested_actions(a, rem); 2363 break; 2364 } 2365 } 2366 2367 static void ovs_nla_free_dec_ttl_action(const struct nlattr *action) 2368 { 2369 const struct nlattr *a = nla_data(action); 2370 2371 switch (nla_type(a)) { 2372 case OVS_DEC_TTL_ATTR_ACTION: 2373 ovs_nla_free_nested_actions(nla_data(a), nla_len(a)); 2374 break; 2375 } 2376 } 2377 2378 static void ovs_nla_free_sample_action(const struct nlattr *action) 2379 { 2380 const struct nlattr *a = nla_data(action); 2381 int rem = nla_len(action); 2382 2383 switch (nla_type(a)) { 2384 case OVS_SAMPLE_ATTR_ARG: 2385 /* The real list of actions follows this attribute. */ 2386 a = nla_next(a, &rem); 2387 ovs_nla_free_nested_actions(a, rem); 2388 break; 2389 } 2390 } 2391 2392 static void ovs_nla_free_set_action(const struct nlattr *a) 2393 { 2394 const struct nlattr *ovs_key = nla_data(a); 2395 struct ovs_tunnel_info *ovs_tun; 2396 2397 switch (nla_type(ovs_key)) { 2398 case OVS_KEY_ATTR_TUNNEL_INFO: 2399 ovs_tun = nla_data(ovs_key); 2400 dst_release((struct dst_entry *)ovs_tun->tun_dst); 2401 break; 2402 } 2403 } 2404 2405 static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len) 2406 { 2407 const struct nlattr *a; 2408 int rem; 2409 2410 /* Whenever new actions are added, the need to update this 2411 * function should be considered. 2412 */ 2413 BUILD_BUG_ON(OVS_ACTION_ATTR_MAX != 25); 2414 2415 if (!actions) 2416 return; 2417 2418 nla_for_each_attr(a, actions, len, rem) { 2419 switch (nla_type(a)) { 2420 case OVS_ACTION_ATTR_CHECK_PKT_LEN: 2421 ovs_nla_free_check_pkt_len_action(a); 2422 break; 2423 2424 case OVS_ACTION_ATTR_CLONE: 2425 ovs_nla_free_clone_action(a); 2426 break; 2427 2428 case OVS_ACTION_ATTR_CT: 2429 ovs_ct_free_action(a); 2430 break; 2431 2432 case OVS_ACTION_ATTR_DEC_TTL: 2433 ovs_nla_free_dec_ttl_action(a); 2434 break; 2435 2436 case OVS_ACTION_ATTR_SAMPLE: 2437 ovs_nla_free_sample_action(a); 2438 break; 2439 2440 case OVS_ACTION_ATTR_SET: 2441 ovs_nla_free_set_action(a); 2442 break; 2443 } 2444 } 2445 } 2446 2447 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts) 2448 { 2449 if (!sf_acts) 2450 return; 2451 2452 ovs_nla_free_nested_actions(sf_acts->actions, sf_acts->actions_len); 2453 kfree(sf_acts); 2454 } 2455 2456 static void __ovs_nla_free_flow_actions(struct rcu_head *head) 2457 { 2458 ovs_nla_free_flow_actions(container_of(head, struct sw_flow_actions, rcu)); 2459 } 2460 2461 /* Schedules 'sf_acts' to be freed after the next RCU grace period. 2462 * The caller must hold rcu_read_lock for this to be sensible. */ 2463 void ovs_nla_free_flow_actions_rcu(struct sw_flow_actions *sf_acts) 2464 { 2465 call_rcu(&sf_acts->rcu, __ovs_nla_free_flow_actions); 2466 } 2467 2468 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, 2469 int attr_len, bool log) 2470 { 2471 2472 struct sw_flow_actions *acts; 2473 int new_acts_size; 2474 size_t req_size = NLA_ALIGN(attr_len); 2475 int next_offset = offsetof(struct sw_flow_actions, actions) + 2476 (*sfa)->actions_len; 2477 2478 if (req_size <= (ksize(*sfa) - next_offset)) 2479 goto out; 2480 2481 new_acts_size = max(next_offset + req_size, ksize(*sfa) * 2); 2482 2483 if (new_acts_size > MAX_ACTIONS_BUFSIZE) { 2484 if ((next_offset + req_size) > MAX_ACTIONS_BUFSIZE) { 2485 OVS_NLERR(log, "Flow action size exceeds max %u", 2486 MAX_ACTIONS_BUFSIZE); 2487 return ERR_PTR(-EMSGSIZE); 2488 } 2489 new_acts_size = MAX_ACTIONS_BUFSIZE; 2490 } 2491 2492 acts = nla_alloc_flow_actions(new_acts_size); 2493 if (IS_ERR(acts)) 2494 return (void *)acts; 2495 2496 memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len); 2497 acts->actions_len = (*sfa)->actions_len; 2498 acts->orig_len = (*sfa)->orig_len; 2499 kfree(*sfa); 2500 *sfa = acts; 2501 2502 out: 2503 (*sfa)->actions_len += req_size; 2504 return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset); 2505 } 2506 2507 static struct nlattr *__add_action(struct sw_flow_actions **sfa, 2508 int attrtype, void *data, int len, bool log) 2509 { 2510 struct nlattr *a; 2511 2512 a = reserve_sfa_size(sfa, nla_attr_size(len), log); 2513 if (IS_ERR(a)) 2514 return a; 2515 2516 a->nla_type = attrtype; 2517 a->nla_len = nla_attr_size(len); 2518 2519 if (data) 2520 memcpy(nla_data(a), data, len); 2521 memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len)); 2522 2523 return a; 2524 } 2525 2526 int ovs_nla_add_action(struct sw_flow_actions **sfa, int attrtype, void *data, 2527 int len, bool log) 2528 { 2529 struct nlattr *a; 2530 2531 a = __add_action(sfa, attrtype, data, len, log); 2532 2533 return PTR_ERR_OR_ZERO(a); 2534 } 2535 2536 static inline int add_nested_action_start(struct sw_flow_actions **sfa, 2537 int attrtype, bool log) 2538 { 2539 int used = (*sfa)->actions_len; 2540 int err; 2541 2542 err = ovs_nla_add_action(sfa, attrtype, NULL, 0, log); 2543 if (err) 2544 return err; 2545 2546 return used; 2547 } 2548 2549 static inline void add_nested_action_end(struct sw_flow_actions *sfa, 2550 int st_offset) 2551 { 2552 struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + 2553 st_offset); 2554 2555 a->nla_len = sfa->actions_len - st_offset; 2556 } 2557 2558 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, 2559 const struct sw_flow_key *key, 2560 struct sw_flow_actions **sfa, 2561 __be16 eth_type, __be16 vlan_tci, 2562 u32 mpls_label_count, bool log, 2563 u32 depth); 2564 2565 static int validate_and_copy_sample(struct net *net, const struct nlattr *attr, 2566 const struct sw_flow_key *key, 2567 struct sw_flow_actions **sfa, 2568 __be16 eth_type, __be16 vlan_tci, 2569 u32 mpls_label_count, bool log, bool last, 2570 u32 depth) 2571 { 2572 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; 2573 const struct nlattr *probability, *actions; 2574 const struct nlattr *a; 2575 int rem, start, err; 2576 struct sample_arg arg; 2577 2578 memset(attrs, 0, sizeof(attrs)); 2579 nla_for_each_nested(a, attr, rem) { 2580 int type = nla_type(a); 2581 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) 2582 return -EINVAL; 2583 attrs[type] = a; 2584 } 2585 if (rem) 2586 return -EINVAL; 2587 2588 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; 2589 if (!probability || nla_len(probability) != sizeof(u32)) 2590 return -EINVAL; 2591 2592 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; 2593 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) 2594 return -EINVAL; 2595 2596 /* validation done, copy sample action. */ 2597 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log); 2598 if (start < 0) 2599 return start; 2600 2601 /* When both skb and flow may be changed, put the sample 2602 * into a deferred fifo. On the other hand, if only skb 2603 * may be modified, the actions can be executed in place. 2604 * 2605 * Do this analysis at the flow installation time. 2606 * Set 'clone_action->exec' to true if the actions can be 2607 * executed without being deferred. 2608 * 2609 * If the sample is the last action, it can always be excuted 2610 * rather than deferred. 2611 */ 2612 arg.exec = last || !actions_may_change_flow(actions); 2613 arg.probability = nla_get_u32(probability); 2614 2615 err = ovs_nla_add_action(sfa, OVS_SAMPLE_ATTR_ARG, &arg, sizeof(arg), 2616 log); 2617 if (err) 2618 return err; 2619 2620 err = __ovs_nla_copy_actions(net, actions, key, sfa, 2621 eth_type, vlan_tci, mpls_label_count, log, 2622 depth + 1); 2623 2624 if (err) 2625 return err; 2626 2627 add_nested_action_end(*sfa, start); 2628 2629 return 0; 2630 } 2631 2632 static int validate_and_copy_dec_ttl(struct net *net, 2633 const struct nlattr *attr, 2634 const struct sw_flow_key *key, 2635 struct sw_flow_actions **sfa, 2636 __be16 eth_type, __be16 vlan_tci, 2637 u32 mpls_label_count, bool log, 2638 u32 depth) 2639 { 2640 const struct nlattr *attrs[OVS_DEC_TTL_ATTR_MAX + 1]; 2641 int start, action_start, err, rem; 2642 const struct nlattr *a, *actions; 2643 2644 memset(attrs, 0, sizeof(attrs)); 2645 nla_for_each_nested(a, attr, rem) { 2646 int type = nla_type(a); 2647 2648 /* Ignore unknown attributes to be future proof. */ 2649 if (type > OVS_DEC_TTL_ATTR_MAX) 2650 continue; 2651 2652 if (!type || attrs[type]) { 2653 OVS_NLERR(log, "Duplicate or invalid key (type %d).", 2654 type); 2655 return -EINVAL; 2656 } 2657 2658 attrs[type] = a; 2659 } 2660 2661 if (rem) { 2662 OVS_NLERR(log, "Message has %d unknown bytes.", rem); 2663 return -EINVAL; 2664 } 2665 2666 actions = attrs[OVS_DEC_TTL_ATTR_ACTION]; 2667 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) { 2668 OVS_NLERR(log, "Missing valid actions attribute."); 2669 return -EINVAL; 2670 } 2671 2672 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_DEC_TTL, log); 2673 if (start < 0) 2674 return start; 2675 2676 action_start = add_nested_action_start(sfa, OVS_DEC_TTL_ATTR_ACTION, log); 2677 if (action_start < 0) 2678 return action_start; 2679 2680 err = __ovs_nla_copy_actions(net, actions, key, sfa, eth_type, 2681 vlan_tci, mpls_label_count, log, 2682 depth + 1); 2683 if (err) 2684 return err; 2685 2686 add_nested_action_end(*sfa, action_start); 2687 add_nested_action_end(*sfa, start); 2688 return 0; 2689 } 2690 2691 static int validate_and_copy_clone(struct net *net, 2692 const struct nlattr *attr, 2693 const struct sw_flow_key *key, 2694 struct sw_flow_actions **sfa, 2695 __be16 eth_type, __be16 vlan_tci, 2696 u32 mpls_label_count, bool log, bool last, 2697 u32 depth) 2698 { 2699 int start, err; 2700 u32 exec; 2701 2702 if (nla_len(attr) && nla_len(attr) < NLA_HDRLEN) 2703 return -EINVAL; 2704 2705 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CLONE, log); 2706 if (start < 0) 2707 return start; 2708 2709 exec = last || !actions_may_change_flow(attr); 2710 2711 err = ovs_nla_add_action(sfa, OVS_CLONE_ATTR_EXEC, &exec, 2712 sizeof(exec), log); 2713 if (err) 2714 return err; 2715 2716 err = __ovs_nla_copy_actions(net, attr, key, sfa, 2717 eth_type, vlan_tci, mpls_label_count, log, 2718 depth + 1); 2719 if (err) 2720 return err; 2721 2722 add_nested_action_end(*sfa, start); 2723 2724 return 0; 2725 } 2726 2727 void ovs_match_init(struct sw_flow_match *match, 2728 struct sw_flow_key *key, 2729 bool reset_key, 2730 struct sw_flow_mask *mask) 2731 { 2732 memset(match, 0, sizeof(*match)); 2733 match->key = key; 2734 match->mask = mask; 2735 2736 if (reset_key) 2737 memset(key, 0, sizeof(*key)); 2738 2739 if (mask) { 2740 memset(&mask->key, 0, sizeof(mask->key)); 2741 mask->range.start = mask->range.end = 0; 2742 } 2743 } 2744 2745 static int validate_geneve_opts(struct sw_flow_key *key) 2746 { 2747 struct geneve_opt *option; 2748 int opts_len = key->tun_opts_len; 2749 bool crit_opt = false; 2750 2751 option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len); 2752 while (opts_len > 0) { 2753 int len; 2754 2755 if (opts_len < sizeof(*option)) 2756 return -EINVAL; 2757 2758 len = sizeof(*option) + option->length * 4; 2759 if (len > opts_len) 2760 return -EINVAL; 2761 2762 crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE); 2763 2764 option = (struct geneve_opt *)((u8 *)option + len); 2765 opts_len -= len; 2766 } 2767 2768 if (crit_opt) 2769 __set_bit(IP_TUNNEL_CRIT_OPT_BIT, key->tun_key.tun_flags); 2770 2771 return 0; 2772 } 2773 2774 static int validate_and_copy_set_tun(const struct nlattr *attr, 2775 struct sw_flow_actions **sfa, bool log) 2776 { 2777 IP_TUNNEL_DECLARE_FLAGS(dst_opt_type) = { }; 2778 struct sw_flow_match match; 2779 struct sw_flow_key key; 2780 struct metadata_dst *tun_dst; 2781 struct ip_tunnel_info *tun_info; 2782 struct ovs_tunnel_info *ovs_tun; 2783 struct nlattr *a; 2784 int err = 0, start, opts_type; 2785 2786 ovs_match_init(&match, &key, true, NULL); 2787 opts_type = ip_tun_from_nlattr(nla_data(attr), &match, false, log); 2788 if (opts_type < 0) 2789 return opts_type; 2790 2791 if (key.tun_opts_len) { 2792 switch (opts_type) { 2793 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS: 2794 err = validate_geneve_opts(&key); 2795 if (err < 0) 2796 return err; 2797 2798 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, dst_opt_type); 2799 break; 2800 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS: 2801 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, dst_opt_type); 2802 break; 2803 case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS: 2804 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, dst_opt_type); 2805 break; 2806 } 2807 } 2808 2809 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log); 2810 if (start < 0) 2811 return start; 2812 2813 tun_dst = metadata_dst_alloc(key.tun_opts_len, METADATA_IP_TUNNEL, 2814 GFP_KERNEL); 2815 2816 if (!tun_dst) 2817 return -ENOMEM; 2818 2819 err = dst_cache_init(&tun_dst->u.tun_info.dst_cache, GFP_KERNEL); 2820 if (err) { 2821 dst_release((struct dst_entry *)tun_dst); 2822 return err; 2823 } 2824 2825 a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL, 2826 sizeof(*ovs_tun), log); 2827 if (IS_ERR(a)) { 2828 dst_release((struct dst_entry *)tun_dst); 2829 return PTR_ERR(a); 2830 } 2831 2832 ovs_tun = nla_data(a); 2833 ovs_tun->tun_dst = tun_dst; 2834 2835 tun_info = &tun_dst->u.tun_info; 2836 tun_info->mode = IP_TUNNEL_INFO_TX; 2837 if (key.tun_proto == AF_INET6) 2838 tun_info->mode |= IP_TUNNEL_INFO_IPV6; 2839 else if (key.tun_proto == AF_INET && key.tun_key.u.ipv4.dst == 0) 2840 tun_info->mode |= IP_TUNNEL_INFO_BRIDGE; 2841 tun_info->key = key.tun_key; 2842 2843 /* We need to store the options in the action itself since 2844 * everything else will go away after flow setup. We can append 2845 * it to tun_info and then point there. 2846 */ 2847 ip_tunnel_info_opts_set(tun_info, 2848 TUN_METADATA_OPTS(&key, key.tun_opts_len), 2849 key.tun_opts_len, dst_opt_type); 2850 add_nested_action_end(*sfa, start); 2851 2852 return err; 2853 } 2854 2855 static bool validate_nsh(const struct nlattr *attr, bool is_mask, 2856 bool is_push_nsh, bool log) 2857 { 2858 struct sw_flow_match match; 2859 struct sw_flow_key key; 2860 int ret = 0; 2861 2862 ovs_match_init(&match, &key, true, NULL); 2863 ret = nsh_key_put_from_nlattr(attr, &match, is_mask, 2864 is_push_nsh, log); 2865 return !ret; 2866 } 2867 2868 /* Return false if there are any non-masked bits set. 2869 * Mask follows data immediately, before any netlink padding. 2870 */ 2871 static bool validate_masked(u8 *data, int len) 2872 { 2873 u8 *mask = data + len; 2874 2875 while (len--) 2876 if (*data++ & ~*mask++) 2877 return false; 2878 2879 return true; 2880 } 2881 2882 static int validate_set(const struct nlattr *a, 2883 const struct sw_flow_key *flow_key, 2884 struct sw_flow_actions **sfa, bool *skip_copy, 2885 u8 mac_proto, __be16 eth_type, bool masked, bool log) 2886 { 2887 const struct nlattr *ovs_key = nla_data(a); 2888 int key_type = nla_type(ovs_key); 2889 size_t key_len; 2890 2891 /* There can be only one key in a action */ 2892 if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) 2893 return -EINVAL; 2894 2895 key_len = nla_len(ovs_key); 2896 if (masked) 2897 key_len /= 2; 2898 2899 if (key_type > OVS_KEY_ATTR_MAX || 2900 !check_attr_len(key_len, ovs_key_lens[key_type].len)) 2901 return -EINVAL; 2902 2903 if (masked && !validate_masked(nla_data(ovs_key), key_len)) 2904 return -EINVAL; 2905 2906 switch (key_type) { 2907 case OVS_KEY_ATTR_PRIORITY: 2908 case OVS_KEY_ATTR_SKB_MARK: 2909 case OVS_KEY_ATTR_CT_MARK: 2910 case OVS_KEY_ATTR_CT_LABELS: 2911 break; 2912 2913 case OVS_KEY_ATTR_ETHERNET: 2914 if (mac_proto != MAC_PROTO_ETHERNET) 2915 return -EINVAL; 2916 break; 2917 2918 case OVS_KEY_ATTR_TUNNEL: { 2919 int err; 2920 2921 if (masked) 2922 return -EINVAL; /* Masked tunnel set not supported. */ 2923 2924 *skip_copy = true; 2925 err = validate_and_copy_set_tun(a, sfa, log); 2926 if (err) 2927 return err; 2928 break; 2929 } 2930 case OVS_KEY_ATTR_IPV4: { 2931 const struct ovs_key_ipv4 *ipv4_key; 2932 2933 if (eth_type != htons(ETH_P_IP)) 2934 return -EINVAL; 2935 2936 ipv4_key = nla_data(ovs_key); 2937 2938 if (masked) { 2939 const struct ovs_key_ipv4 *mask = ipv4_key + 1; 2940 2941 /* Non-writeable fields. */ 2942 if (mask->ipv4_proto || mask->ipv4_frag) 2943 return -EINVAL; 2944 } else { 2945 if (ipv4_key->ipv4_proto != flow_key->ip.proto) 2946 return -EINVAL; 2947 2948 if (ipv4_key->ipv4_frag != flow_key->ip.frag) 2949 return -EINVAL; 2950 } 2951 break; 2952 } 2953 case OVS_KEY_ATTR_IPV6: { 2954 const struct ovs_key_ipv6 *ipv6_key; 2955 2956 if (eth_type != htons(ETH_P_IPV6)) 2957 return -EINVAL; 2958 2959 ipv6_key = nla_data(ovs_key); 2960 2961 if (masked) { 2962 const struct ovs_key_ipv6 *mask = ipv6_key + 1; 2963 2964 /* Non-writeable fields. */ 2965 if (mask->ipv6_proto || mask->ipv6_frag) 2966 return -EINVAL; 2967 2968 /* Invalid bits in the flow label mask? */ 2969 if (ntohl(mask->ipv6_label) & 0xFFF00000) 2970 return -EINVAL; 2971 } else { 2972 if (ipv6_key->ipv6_proto != flow_key->ip.proto) 2973 return -EINVAL; 2974 2975 if (ipv6_key->ipv6_frag != flow_key->ip.frag) 2976 return -EINVAL; 2977 } 2978 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000) 2979 return -EINVAL; 2980 2981 break; 2982 } 2983 case OVS_KEY_ATTR_TCP: 2984 if ((eth_type != htons(ETH_P_IP) && 2985 eth_type != htons(ETH_P_IPV6)) || 2986 flow_key->ip.proto != IPPROTO_TCP) 2987 return -EINVAL; 2988 2989 break; 2990 2991 case OVS_KEY_ATTR_UDP: 2992 if ((eth_type != htons(ETH_P_IP) && 2993 eth_type != htons(ETH_P_IPV6)) || 2994 flow_key->ip.proto != IPPROTO_UDP) 2995 return -EINVAL; 2996 2997 break; 2998 2999 case OVS_KEY_ATTR_MPLS: 3000 if (!eth_p_mpls(eth_type)) 3001 return -EINVAL; 3002 break; 3003 3004 case OVS_KEY_ATTR_SCTP: 3005 if ((eth_type != htons(ETH_P_IP) && 3006 eth_type != htons(ETH_P_IPV6)) || 3007 flow_key->ip.proto != IPPROTO_SCTP) 3008 return -EINVAL; 3009 3010 break; 3011 3012 case OVS_KEY_ATTR_NSH: 3013 if (eth_type != htons(ETH_P_NSH)) 3014 return -EINVAL; 3015 if (!validate_nsh(nla_data(a), masked, false, log)) 3016 return -EINVAL; 3017 break; 3018 3019 default: 3020 return -EINVAL; 3021 } 3022 3023 /* Convert non-masked non-tunnel set actions to masked set actions. */ 3024 if (!masked && key_type != OVS_KEY_ATTR_TUNNEL) { 3025 int start, len = key_len * 2; 3026 struct nlattr *at; 3027 3028 *skip_copy = true; 3029 3030 start = add_nested_action_start(sfa, 3031 OVS_ACTION_ATTR_SET_TO_MASKED, 3032 log); 3033 if (start < 0) 3034 return start; 3035 3036 at = __add_action(sfa, key_type, NULL, len, log); 3037 if (IS_ERR(at)) 3038 return PTR_ERR(at); 3039 3040 memcpy(nla_data(at), nla_data(ovs_key), key_len); /* Key. */ 3041 memset(nla_data(at) + key_len, 0xff, key_len); /* Mask. */ 3042 /* Clear non-writeable bits from otherwise writeable fields. */ 3043 if (key_type == OVS_KEY_ATTR_IPV6) { 3044 struct ovs_key_ipv6 *mask = nla_data(at) + key_len; 3045 3046 mask->ipv6_label &= htonl(0x000FFFFF); 3047 } 3048 add_nested_action_end(*sfa, start); 3049 } 3050 3051 return 0; 3052 } 3053 3054 static int validate_userspace(const struct nlattr *attr) 3055 { 3056 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { 3057 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, 3058 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC }, 3059 [OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 }, 3060 }; 3061 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; 3062 int error; 3063 3064 error = nla_parse_nested_deprecated(a, OVS_USERSPACE_ATTR_MAX, attr, 3065 userspace_policy, NULL); 3066 if (error) 3067 return error; 3068 3069 if (!a[OVS_USERSPACE_ATTR_PID] || 3070 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) 3071 return -EINVAL; 3072 3073 return 0; 3074 } 3075 3076 static const struct nla_policy cpl_policy[OVS_CHECK_PKT_LEN_ATTR_MAX + 1] = { 3077 [OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] = {.type = NLA_U16 }, 3078 [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER] = {.type = NLA_NESTED }, 3079 [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL] = {.type = NLA_NESTED }, 3080 }; 3081 3082 static int validate_and_copy_check_pkt_len(struct net *net, 3083 const struct nlattr *attr, 3084 const struct sw_flow_key *key, 3085 struct sw_flow_actions **sfa, 3086 __be16 eth_type, __be16 vlan_tci, 3087 u32 mpls_label_count, 3088 bool log, bool last, u32 depth) 3089 { 3090 const struct nlattr *acts_if_greater, *acts_if_lesser_eq; 3091 struct nlattr *a[OVS_CHECK_PKT_LEN_ATTR_MAX + 1]; 3092 struct check_pkt_len_arg arg; 3093 int nested_acts_start; 3094 int start, err; 3095 3096 err = nla_parse_deprecated_strict(a, OVS_CHECK_PKT_LEN_ATTR_MAX, 3097 nla_data(attr), nla_len(attr), 3098 cpl_policy, NULL); 3099 if (err) 3100 return err; 3101 3102 if (!a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] || 3103 !nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN])) 3104 return -EINVAL; 3105 3106 acts_if_lesser_eq = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL]; 3107 acts_if_greater = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER]; 3108 3109 /* Both the nested action should be present. */ 3110 if (!acts_if_greater || !acts_if_lesser_eq) 3111 return -EINVAL; 3112 3113 /* validation done, copy the nested actions. */ 3114 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CHECK_PKT_LEN, 3115 log); 3116 if (start < 0) 3117 return start; 3118 3119 arg.pkt_len = nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN]); 3120 arg.exec_for_lesser_equal = 3121 last || !actions_may_change_flow(acts_if_lesser_eq); 3122 arg.exec_for_greater = 3123 last || !actions_may_change_flow(acts_if_greater); 3124 3125 err = ovs_nla_add_action(sfa, OVS_CHECK_PKT_LEN_ATTR_ARG, &arg, 3126 sizeof(arg), log); 3127 if (err) 3128 return err; 3129 3130 nested_acts_start = add_nested_action_start(sfa, 3131 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL, log); 3132 if (nested_acts_start < 0) 3133 return nested_acts_start; 3134 3135 err = __ovs_nla_copy_actions(net, acts_if_lesser_eq, key, sfa, 3136 eth_type, vlan_tci, mpls_label_count, log, 3137 depth + 1); 3138 3139 if (err) 3140 return err; 3141 3142 add_nested_action_end(*sfa, nested_acts_start); 3143 3144 nested_acts_start = add_nested_action_start(sfa, 3145 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER, log); 3146 if (nested_acts_start < 0) 3147 return nested_acts_start; 3148 3149 err = __ovs_nla_copy_actions(net, acts_if_greater, key, sfa, 3150 eth_type, vlan_tci, mpls_label_count, log, 3151 depth + 1); 3152 3153 if (err) 3154 return err; 3155 3156 add_nested_action_end(*sfa, nested_acts_start); 3157 add_nested_action_end(*sfa, start); 3158 return 0; 3159 } 3160 3161 static int validate_psample(const struct nlattr *attr) 3162 { 3163 static const struct nla_policy policy[OVS_PSAMPLE_ATTR_MAX + 1] = { 3164 [OVS_PSAMPLE_ATTR_GROUP] = { .type = NLA_U32 }, 3165 [OVS_PSAMPLE_ATTR_COOKIE] = { 3166 .type = NLA_BINARY, 3167 .len = OVS_PSAMPLE_COOKIE_MAX_SIZE, 3168 }, 3169 }; 3170 struct nlattr *a[OVS_PSAMPLE_ATTR_MAX + 1]; 3171 int err; 3172 3173 if (!IS_ENABLED(CONFIG_PSAMPLE)) 3174 return -EOPNOTSUPP; 3175 3176 err = nla_parse_nested(a, OVS_PSAMPLE_ATTR_MAX, attr, policy, NULL); 3177 if (err) 3178 return err; 3179 3180 return a[OVS_PSAMPLE_ATTR_GROUP] ? 0 : -EINVAL; 3181 } 3182 3183 static int copy_action(const struct nlattr *from, 3184 struct sw_flow_actions **sfa, bool log) 3185 { 3186 int totlen = NLA_ALIGN(from->nla_len); 3187 struct nlattr *to; 3188 3189 to = reserve_sfa_size(sfa, from->nla_len, log); 3190 if (IS_ERR(to)) 3191 return PTR_ERR(to); 3192 3193 memcpy(to, from, totlen); 3194 return 0; 3195 } 3196 3197 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, 3198 const struct sw_flow_key *key, 3199 struct sw_flow_actions **sfa, 3200 __be16 eth_type, __be16 vlan_tci, 3201 u32 mpls_label_count, bool log, 3202 u32 depth) 3203 { 3204 u8 mac_proto = ovs_key_mac_proto(key); 3205 const struct nlattr *a; 3206 int rem, err; 3207 3208 if (depth > OVS_COPY_ACTIONS_MAX_DEPTH) 3209 return -EOVERFLOW; 3210 3211 nla_for_each_nested(a, attr, rem) { 3212 /* Expected argument lengths, (u32)-1 for variable length. */ 3213 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { 3214 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), 3215 [OVS_ACTION_ATTR_RECIRC] = sizeof(u32), 3216 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, 3217 [OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls), 3218 [OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16), 3219 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), 3220 [OVS_ACTION_ATTR_POP_VLAN] = 0, 3221 [OVS_ACTION_ATTR_SET] = (u32)-1, 3222 [OVS_ACTION_ATTR_SET_MASKED] = (u32)-1, 3223 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1, 3224 [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash), 3225 [OVS_ACTION_ATTR_CT] = (u32)-1, 3226 [OVS_ACTION_ATTR_CT_CLEAR] = 0, 3227 [OVS_ACTION_ATTR_TRUNC] = sizeof(struct ovs_action_trunc), 3228 [OVS_ACTION_ATTR_PUSH_ETH] = sizeof(struct ovs_action_push_eth), 3229 [OVS_ACTION_ATTR_POP_ETH] = 0, 3230 [OVS_ACTION_ATTR_PUSH_NSH] = (u32)-1, 3231 [OVS_ACTION_ATTR_POP_NSH] = 0, 3232 [OVS_ACTION_ATTR_METER] = sizeof(u32), 3233 [OVS_ACTION_ATTR_CLONE] = (u32)-1, 3234 [OVS_ACTION_ATTR_CHECK_PKT_LEN] = (u32)-1, 3235 [OVS_ACTION_ATTR_ADD_MPLS] = sizeof(struct ovs_action_add_mpls), 3236 [OVS_ACTION_ATTR_DEC_TTL] = (u32)-1, 3237 [OVS_ACTION_ATTR_DROP] = sizeof(u32), 3238 [OVS_ACTION_ATTR_PSAMPLE] = (u32)-1, 3239 }; 3240 const struct ovs_action_push_vlan *vlan; 3241 int type = nla_type(a); 3242 bool skip_copy; 3243 3244 if (type > OVS_ACTION_ATTR_MAX || 3245 (action_lens[type] != nla_len(a) && 3246 action_lens[type] != (u32)-1)) 3247 return -EINVAL; 3248 3249 skip_copy = false; 3250 switch (type) { 3251 case OVS_ACTION_ATTR_UNSPEC: 3252 return -EINVAL; 3253 3254 case OVS_ACTION_ATTR_USERSPACE: 3255 err = validate_userspace(a); 3256 if (err) 3257 return err; 3258 break; 3259 3260 case OVS_ACTION_ATTR_OUTPUT: 3261 if (nla_get_u32(a) >= DP_MAX_PORTS) 3262 return -EINVAL; 3263 break; 3264 3265 case OVS_ACTION_ATTR_TRUNC: { 3266 const struct ovs_action_trunc *trunc = nla_data(a); 3267 3268 if (trunc->max_len < ETH_HLEN) 3269 return -EINVAL; 3270 break; 3271 } 3272 3273 case OVS_ACTION_ATTR_HASH: { 3274 const struct ovs_action_hash *act_hash = nla_data(a); 3275 3276 switch (act_hash->hash_alg) { 3277 case OVS_HASH_ALG_L4: 3278 fallthrough; 3279 case OVS_HASH_ALG_SYM_L4: 3280 break; 3281 default: 3282 return -EINVAL; 3283 } 3284 3285 break; 3286 } 3287 3288 case OVS_ACTION_ATTR_POP_VLAN: 3289 if (mac_proto != MAC_PROTO_ETHERNET) 3290 return -EINVAL; 3291 vlan_tci = htons(0); 3292 break; 3293 3294 case OVS_ACTION_ATTR_PUSH_VLAN: 3295 if (mac_proto != MAC_PROTO_ETHERNET) 3296 return -EINVAL; 3297 vlan = nla_data(a); 3298 if (!eth_type_vlan(vlan->vlan_tpid)) 3299 return -EINVAL; 3300 if (!(vlan->vlan_tci & htons(VLAN_CFI_MASK))) 3301 return -EINVAL; 3302 vlan_tci = vlan->vlan_tci; 3303 break; 3304 3305 case OVS_ACTION_ATTR_RECIRC: 3306 break; 3307 3308 case OVS_ACTION_ATTR_ADD_MPLS: { 3309 const struct ovs_action_add_mpls *mpls = nla_data(a); 3310 3311 if (!eth_p_mpls(mpls->mpls_ethertype)) 3312 return -EINVAL; 3313 3314 if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK) { 3315 if (vlan_tci & htons(VLAN_CFI_MASK) || 3316 (eth_type != htons(ETH_P_IP) && 3317 eth_type != htons(ETH_P_IPV6) && 3318 eth_type != htons(ETH_P_ARP) && 3319 eth_type != htons(ETH_P_RARP) && 3320 !eth_p_mpls(eth_type))) 3321 return -EINVAL; 3322 mpls_label_count++; 3323 } else { 3324 if (mac_proto == MAC_PROTO_ETHERNET) { 3325 mpls_label_count = 1; 3326 mac_proto = MAC_PROTO_NONE; 3327 } else { 3328 mpls_label_count++; 3329 } 3330 } 3331 eth_type = mpls->mpls_ethertype; 3332 break; 3333 } 3334 3335 case OVS_ACTION_ATTR_PUSH_MPLS: { 3336 const struct ovs_action_push_mpls *mpls = nla_data(a); 3337 3338 if (!eth_p_mpls(mpls->mpls_ethertype)) 3339 return -EINVAL; 3340 /* Prohibit push MPLS other than to a white list 3341 * for packets that have a known tag order. 3342 */ 3343 if (vlan_tci & htons(VLAN_CFI_MASK) || 3344 (eth_type != htons(ETH_P_IP) && 3345 eth_type != htons(ETH_P_IPV6) && 3346 eth_type != htons(ETH_P_ARP) && 3347 eth_type != htons(ETH_P_RARP) && 3348 !eth_p_mpls(eth_type))) 3349 return -EINVAL; 3350 eth_type = mpls->mpls_ethertype; 3351 mpls_label_count++; 3352 break; 3353 } 3354 3355 case OVS_ACTION_ATTR_POP_MPLS: { 3356 __be16 proto; 3357 if (vlan_tci & htons(VLAN_CFI_MASK) || 3358 !eth_p_mpls(eth_type)) 3359 return -EINVAL; 3360 3361 /* Disallow subsequent L2.5+ set actions and mpls_pop 3362 * actions once the last MPLS label in the packet is 3363 * popped as there is no check here to ensure that 3364 * the new eth type is valid and thus set actions could 3365 * write off the end of the packet or otherwise corrupt 3366 * it. 3367 * 3368 * Support for these actions is planned using packet 3369 * recirculation. 3370 */ 3371 proto = nla_get_be16(a); 3372 3373 if (proto == htons(ETH_P_TEB) && 3374 mac_proto != MAC_PROTO_NONE) 3375 return -EINVAL; 3376 3377 mpls_label_count--; 3378 3379 if (!eth_p_mpls(proto) || !mpls_label_count) 3380 eth_type = htons(0); 3381 else 3382 eth_type = proto; 3383 3384 break; 3385 } 3386 3387 case OVS_ACTION_ATTR_SET: 3388 err = validate_set(a, key, sfa, 3389 &skip_copy, mac_proto, eth_type, 3390 false, log); 3391 if (err) 3392 return err; 3393 break; 3394 3395 case OVS_ACTION_ATTR_SET_MASKED: 3396 err = validate_set(a, key, sfa, 3397 &skip_copy, mac_proto, eth_type, 3398 true, log); 3399 if (err) 3400 return err; 3401 break; 3402 3403 case OVS_ACTION_ATTR_SAMPLE: { 3404 bool last = nla_is_last(a, rem); 3405 3406 err = validate_and_copy_sample(net, a, key, sfa, 3407 eth_type, vlan_tci, 3408 mpls_label_count, 3409 log, last, depth); 3410 if (err) 3411 return err; 3412 skip_copy = true; 3413 break; 3414 } 3415 3416 case OVS_ACTION_ATTR_CT: 3417 err = ovs_ct_copy_action(net, a, key, sfa, log); 3418 if (err) 3419 return err; 3420 skip_copy = true; 3421 break; 3422 3423 case OVS_ACTION_ATTR_CT_CLEAR: 3424 break; 3425 3426 case OVS_ACTION_ATTR_PUSH_ETH: 3427 /* Disallow pushing an Ethernet header if one 3428 * is already present */ 3429 if (mac_proto != MAC_PROTO_NONE) 3430 return -EINVAL; 3431 mac_proto = MAC_PROTO_ETHERNET; 3432 break; 3433 3434 case OVS_ACTION_ATTR_POP_ETH: 3435 if (mac_proto != MAC_PROTO_ETHERNET) 3436 return -EINVAL; 3437 if (vlan_tci & htons(VLAN_CFI_MASK)) 3438 return -EINVAL; 3439 mac_proto = MAC_PROTO_NONE; 3440 break; 3441 3442 case OVS_ACTION_ATTR_PUSH_NSH: 3443 if (mac_proto != MAC_PROTO_ETHERNET) { 3444 u8 next_proto; 3445 3446 next_proto = tun_p_from_eth_p(eth_type); 3447 if (!next_proto) 3448 return -EINVAL; 3449 } 3450 mac_proto = MAC_PROTO_NONE; 3451 if (!validate_nsh(nla_data(a), false, true, true)) 3452 return -EINVAL; 3453 break; 3454 3455 case OVS_ACTION_ATTR_POP_NSH: { 3456 __be16 inner_proto; 3457 3458 if (eth_type != htons(ETH_P_NSH)) 3459 return -EINVAL; 3460 inner_proto = tun_p_to_eth_p(key->nsh.base.np); 3461 if (!inner_proto) 3462 return -EINVAL; 3463 if (key->nsh.base.np == TUN_P_ETHERNET) 3464 mac_proto = MAC_PROTO_ETHERNET; 3465 else 3466 mac_proto = MAC_PROTO_NONE; 3467 break; 3468 } 3469 3470 case OVS_ACTION_ATTR_METER: 3471 /* Non-existent meters are simply ignored. */ 3472 break; 3473 3474 case OVS_ACTION_ATTR_CLONE: { 3475 bool last = nla_is_last(a, rem); 3476 3477 err = validate_and_copy_clone(net, a, key, sfa, 3478 eth_type, vlan_tci, 3479 mpls_label_count, 3480 log, last, depth); 3481 if (err) 3482 return err; 3483 skip_copy = true; 3484 break; 3485 } 3486 3487 case OVS_ACTION_ATTR_CHECK_PKT_LEN: { 3488 bool last = nla_is_last(a, rem); 3489 3490 err = validate_and_copy_check_pkt_len(net, a, key, sfa, 3491 eth_type, 3492 vlan_tci, 3493 mpls_label_count, 3494 log, last, 3495 depth); 3496 if (err) 3497 return err; 3498 skip_copy = true; 3499 break; 3500 } 3501 3502 case OVS_ACTION_ATTR_DEC_TTL: 3503 err = validate_and_copy_dec_ttl(net, a, key, sfa, 3504 eth_type, vlan_tci, 3505 mpls_label_count, log, 3506 depth); 3507 if (err) 3508 return err; 3509 skip_copy = true; 3510 break; 3511 3512 case OVS_ACTION_ATTR_DROP: 3513 if (!nla_is_last(a, rem)) 3514 return -EINVAL; 3515 break; 3516 3517 case OVS_ACTION_ATTR_PSAMPLE: 3518 err = validate_psample(a); 3519 if (err) 3520 return err; 3521 break; 3522 3523 default: 3524 OVS_NLERR(log, "Unknown Action type %d", type); 3525 return -EINVAL; 3526 } 3527 if (!skip_copy) { 3528 err = copy_action(a, sfa, log); 3529 if (err) 3530 return err; 3531 } 3532 } 3533 3534 if (rem > 0) 3535 return -EINVAL; 3536 3537 return 0; 3538 } 3539 3540 /* 'key' must be the masked key. */ 3541 int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, 3542 const struct sw_flow_key *key, 3543 struct sw_flow_actions **sfa, bool log) 3544 { 3545 int err; 3546 u32 mpls_label_count = 0; 3547 3548 *sfa = nla_alloc_flow_actions(min(nla_len(attr), MAX_ACTIONS_BUFSIZE)); 3549 if (IS_ERR(*sfa)) 3550 return PTR_ERR(*sfa); 3551 3552 if (eth_p_mpls(key->eth.type)) 3553 mpls_label_count = hweight_long(key->mpls.num_labels_mask); 3554 3555 (*sfa)->orig_len = nla_len(attr); 3556 err = __ovs_nla_copy_actions(net, attr, key, sfa, key->eth.type, 3557 key->eth.vlan.tci, mpls_label_count, log, 3558 0); 3559 if (err) 3560 ovs_nla_free_flow_actions(*sfa); 3561 3562 return err; 3563 } 3564 3565 static int sample_action_to_attr(const struct nlattr *attr, 3566 struct sk_buff *skb) 3567 { 3568 struct nlattr *start, *ac_start = NULL, *sample_arg; 3569 int err = 0, rem = nla_len(attr); 3570 const struct sample_arg *arg; 3571 struct nlattr *actions; 3572 3573 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SAMPLE); 3574 if (!start) 3575 return -EMSGSIZE; 3576 3577 sample_arg = nla_data(attr); 3578 arg = nla_data(sample_arg); 3579 actions = nla_next(sample_arg, &rem); 3580 3581 if (nla_put_u32(skb, OVS_SAMPLE_ATTR_PROBABILITY, arg->probability)) { 3582 err = -EMSGSIZE; 3583 goto out; 3584 } 3585 3586 ac_start = nla_nest_start_noflag(skb, OVS_SAMPLE_ATTR_ACTIONS); 3587 if (!ac_start) { 3588 err = -EMSGSIZE; 3589 goto out; 3590 } 3591 3592 err = ovs_nla_put_actions(actions, rem, skb); 3593 3594 out: 3595 if (err) { 3596 nla_nest_cancel(skb, ac_start); 3597 nla_nest_cancel(skb, start); 3598 } else { 3599 nla_nest_end(skb, ac_start); 3600 nla_nest_end(skb, start); 3601 } 3602 3603 return err; 3604 } 3605 3606 static int clone_action_to_attr(const struct nlattr *attr, 3607 struct sk_buff *skb) 3608 { 3609 struct nlattr *start; 3610 int err = 0, rem = nla_len(attr); 3611 3612 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CLONE); 3613 if (!start) 3614 return -EMSGSIZE; 3615 3616 /* Skipping the OVS_CLONE_ATTR_EXEC that is always the first attribute. */ 3617 attr = nla_next(nla_data(attr), &rem); 3618 err = ovs_nla_put_actions(attr, rem, skb); 3619 3620 if (err) 3621 nla_nest_cancel(skb, start); 3622 else 3623 nla_nest_end(skb, start); 3624 3625 return err; 3626 } 3627 3628 static int check_pkt_len_action_to_attr(const struct nlattr *attr, 3629 struct sk_buff *skb) 3630 { 3631 struct nlattr *start, *ac_start = NULL; 3632 const struct check_pkt_len_arg *arg; 3633 const struct nlattr *a, *cpl_arg; 3634 int err = 0, rem = nla_len(attr); 3635 3636 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CHECK_PKT_LEN); 3637 if (!start) 3638 return -EMSGSIZE; 3639 3640 /* The first nested attribute in 'attr' is always 3641 * 'OVS_CHECK_PKT_LEN_ATTR_ARG'. 3642 */ 3643 cpl_arg = nla_data(attr); 3644 arg = nla_data(cpl_arg); 3645 3646 if (nla_put_u16(skb, OVS_CHECK_PKT_LEN_ATTR_PKT_LEN, arg->pkt_len)) { 3647 err = -EMSGSIZE; 3648 goto out; 3649 } 3650 3651 /* Second nested attribute in 'attr' is always 3652 * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'. 3653 */ 3654 a = nla_next(cpl_arg, &rem); 3655 ac_start = nla_nest_start_noflag(skb, 3656 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL); 3657 if (!ac_start) { 3658 err = -EMSGSIZE; 3659 goto out; 3660 } 3661 3662 err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb); 3663 if (err) { 3664 nla_nest_cancel(skb, ac_start); 3665 goto out; 3666 } else { 3667 nla_nest_end(skb, ac_start); 3668 } 3669 3670 /* Third nested attribute in 'attr' is always 3671 * OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER. 3672 */ 3673 a = nla_next(a, &rem); 3674 ac_start = nla_nest_start_noflag(skb, 3675 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER); 3676 if (!ac_start) { 3677 err = -EMSGSIZE; 3678 goto out; 3679 } 3680 3681 err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb); 3682 if (err) { 3683 nla_nest_cancel(skb, ac_start); 3684 goto out; 3685 } else { 3686 nla_nest_end(skb, ac_start); 3687 } 3688 3689 nla_nest_end(skb, start); 3690 return 0; 3691 3692 out: 3693 nla_nest_cancel(skb, start); 3694 return err; 3695 } 3696 3697 static int dec_ttl_action_to_attr(const struct nlattr *attr, 3698 struct sk_buff *skb) 3699 { 3700 struct nlattr *start, *action_start; 3701 const struct nlattr *a; 3702 int err = 0, rem; 3703 3704 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_DEC_TTL); 3705 if (!start) 3706 return -EMSGSIZE; 3707 3708 nla_for_each_attr(a, nla_data(attr), nla_len(attr), rem) { 3709 switch (nla_type(a)) { 3710 case OVS_DEC_TTL_ATTR_ACTION: 3711 3712 action_start = nla_nest_start_noflag(skb, OVS_DEC_TTL_ATTR_ACTION); 3713 if (!action_start) { 3714 err = -EMSGSIZE; 3715 goto out; 3716 } 3717 3718 err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb); 3719 if (err) 3720 goto out; 3721 3722 nla_nest_end(skb, action_start); 3723 break; 3724 3725 default: 3726 /* Ignore all other option to be future compatible */ 3727 break; 3728 } 3729 } 3730 3731 nla_nest_end(skb, start); 3732 return 0; 3733 3734 out: 3735 nla_nest_cancel(skb, start); 3736 return err; 3737 } 3738 3739 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb) 3740 { 3741 const struct nlattr *ovs_key = nla_data(a); 3742 int key_type = nla_type(ovs_key); 3743 struct nlattr *start; 3744 int err; 3745 3746 switch (key_type) { 3747 case OVS_KEY_ATTR_TUNNEL_INFO: { 3748 struct ovs_tunnel_info *ovs_tun = nla_data(ovs_key); 3749 struct ip_tunnel_info *tun_info = &ovs_tun->tun_dst->u.tun_info; 3750 3751 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SET); 3752 if (!start) 3753 return -EMSGSIZE; 3754 3755 err = ip_tun_to_nlattr(skb, &tun_info->key, 3756 ip_tunnel_info_opts(tun_info), 3757 tun_info->options_len, 3758 ip_tunnel_info_af(tun_info), tun_info->mode); 3759 if (err) 3760 return err; 3761 nla_nest_end(skb, start); 3762 break; 3763 } 3764 default: 3765 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key)) 3766 return -EMSGSIZE; 3767 break; 3768 } 3769 3770 return 0; 3771 } 3772 3773 static int masked_set_action_to_set_action_attr(const struct nlattr *a, 3774 struct sk_buff *skb) 3775 { 3776 const struct nlattr *ovs_key = nla_data(a); 3777 struct nlattr *nla; 3778 size_t key_len = nla_len(ovs_key) / 2; 3779 3780 /* Revert the conversion we did from a non-masked set action to 3781 * masked set action. 3782 */ 3783 nla = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SET); 3784 if (!nla) 3785 return -EMSGSIZE; 3786 3787 if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key))) 3788 return -EMSGSIZE; 3789 3790 nla_nest_end(skb, nla); 3791 return 0; 3792 } 3793 3794 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb) 3795 { 3796 const struct nlattr *a; 3797 int rem, err; 3798 3799 nla_for_each_attr(a, attr, len, rem) { 3800 int type = nla_type(a); 3801 3802 switch (type) { 3803 case OVS_ACTION_ATTR_SET: 3804 err = set_action_to_attr(a, skb); 3805 if (err) 3806 return err; 3807 break; 3808 3809 case OVS_ACTION_ATTR_SET_TO_MASKED: 3810 err = masked_set_action_to_set_action_attr(a, skb); 3811 if (err) 3812 return err; 3813 break; 3814 3815 case OVS_ACTION_ATTR_SAMPLE: 3816 err = sample_action_to_attr(a, skb); 3817 if (err) 3818 return err; 3819 break; 3820 3821 case OVS_ACTION_ATTR_CT: 3822 err = ovs_ct_action_to_attr(nla_data(a), skb); 3823 if (err) 3824 return err; 3825 break; 3826 3827 case OVS_ACTION_ATTR_CLONE: 3828 err = clone_action_to_attr(a, skb); 3829 if (err) 3830 return err; 3831 break; 3832 3833 case OVS_ACTION_ATTR_CHECK_PKT_LEN: 3834 err = check_pkt_len_action_to_attr(a, skb); 3835 if (err) 3836 return err; 3837 break; 3838 3839 case OVS_ACTION_ATTR_DEC_TTL: 3840 err = dec_ttl_action_to_attr(a, skb); 3841 if (err) 3842 return err; 3843 break; 3844 3845 default: 3846 if (nla_put(skb, type, nla_len(a), nla_data(a))) 3847 return -EMSGSIZE; 3848 break; 3849 } 3850 } 3851 3852 return 0; 3853 } 3854