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flow_netlink.c
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linux-6.19.14/net/openvswitch/flow_netlink.c
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 44struct 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 53static 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 95static 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 163static 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 320size_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 342static 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 355size_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 387static 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 391static 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 411static const struct ovs_len_tbl 412ovs_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. */ 419static 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 456static 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 463static 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 477static 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 529static 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 536int 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 542static 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 593static 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 649static 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 676static 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 866static 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 883static 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 958static 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 979int 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 988static 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 1011static 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 1049static 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 1091static 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 1126static 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 1149static 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 1170static 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/* 1309 * Constructs NSH header 'nh' from attributes of OVS_ACTION_ATTR_PUSH_NSH, 1310 * where 'nh' points to a memory block of 'size' bytes. It's assumed that 1311 * attributes were previously validated with validate_push_nsh(). 1312 */ 1313int nsh_hdr_from_nlattr(const struct nlattr *attr, 1314 struct nshhdr *nh, size_t size) 1315{ 1316 struct nlattr *a; 1317 int rem; 1318 u8 flags = 0; 1319 u8 ttl = 0; 1320 int mdlen = 0; 1321 1322 if (size < NSH_BASE_HDR_LEN) 1323 return -ENOBUFS; 1324 1325 nla_for_each_nested(a, attr, rem) { 1326 int type = nla_type(a); 1327 1328 switch (type) { 1329 case OVS_NSH_KEY_ATTR_BASE: { 1330 const struct ovs_nsh_key_base *base = nla_data(a); 1331 1332 flags = base->flags; 1333 ttl = base->ttl; 1334 nh->np = base->np; 1335 nh->mdtype = base->mdtype; 1336 nh->path_hdr = base->path_hdr; 1337 break; 1338 } 1339 case OVS_NSH_KEY_ATTR_MD1: 1340 mdlen = nla_len(a); 1341 if (mdlen > size - NSH_BASE_HDR_LEN) 1342 return -ENOBUFS; 1343 memcpy(&nh->md1, nla_data(a), mdlen); 1344 break; 1345 1346 case OVS_NSH_KEY_ATTR_MD2: 1347 mdlen = nla_len(a); 1348 if (mdlen > size - NSH_BASE_HDR_LEN) 1349 return -ENOBUFS; 1350 memcpy(&nh->md2, nla_data(a), mdlen); 1351 break; 1352 1353 default: 1354 return -EINVAL; 1355 } 1356 } 1357 1358 /* nsh header length = NSH_BASE_HDR_LEN + mdlen */ 1359 nh->ver_flags_ttl_len = 0; 1360 nsh_set_flags_ttl_len(nh, flags, ttl, NSH_BASE_HDR_LEN + mdlen); 1361 1362 return 0; 1363} 1364 1365static int nsh_key_put_from_nlattr(const struct nlattr *attr, 1366 struct sw_flow_match *match, bool is_mask, 1367 bool is_push_nsh, bool log) 1368{ 1369 struct nlattr *a; 1370 int rem; 1371 bool has_base = false; 1372 bool has_md1 = false; 1373 bool has_md2 = false; 1374 u8 mdtype = 0; 1375 int mdlen = 0; 1376 1377 if (WARN_ON(is_push_nsh && is_mask)) 1378 return -EINVAL; 1379 1380 nla_for_each_nested(a, attr, rem) { 1381 int type = nla_type(a); 1382 int i; 1383 1384 if (type > OVS_NSH_KEY_ATTR_MAX) { 1385 OVS_NLERR(log, "nsh attr %d is out of range max %d", 1386 type, OVS_NSH_KEY_ATTR_MAX); 1387 return -EINVAL; 1388 } 1389 1390 if (!check_attr_len(nla_len(a), 1391 ovs_nsh_key_attr_lens[type].len)) { 1392 OVS_NLERR( 1393 log, 1394 "nsh attr %d has unexpected len %d expected %d", 1395 type, 1396 nla_len(a), 1397 ovs_nsh_key_attr_lens[type].len 1398 ); 1399 return -EINVAL; 1400 } 1401 1402 switch (type) { 1403 case OVS_NSH_KEY_ATTR_BASE: { 1404 const struct ovs_nsh_key_base *base = nla_data(a); 1405 1406 has_base = true; 1407 mdtype = base->mdtype; 1408 SW_FLOW_KEY_PUT(match, nsh.base.flags, 1409 base->flags, is_mask); 1410 SW_FLOW_KEY_PUT(match, nsh.base.ttl, 1411 base->ttl, is_mask); 1412 SW_FLOW_KEY_PUT(match, nsh.base.mdtype, 1413 base->mdtype, is_mask); 1414 SW_FLOW_KEY_PUT(match, nsh.base.np, 1415 base->np, is_mask); 1416 SW_FLOW_KEY_PUT(match, nsh.base.path_hdr, 1417 base->path_hdr, is_mask); 1418 break; 1419 } 1420 case OVS_NSH_KEY_ATTR_MD1: { 1421 const struct ovs_nsh_key_md1 *md1 = nla_data(a); 1422 1423 has_md1 = true; 1424 for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) 1425 SW_FLOW_KEY_PUT(match, nsh.context[i], 1426 md1->context[i], is_mask); 1427 break; 1428 } 1429 case OVS_NSH_KEY_ATTR_MD2: 1430 if (!is_push_nsh) /* Not supported MD type 2 yet */ 1431 return -ENOTSUPP; 1432 1433 has_md2 = true; 1434 mdlen = nla_len(a); 1435 if (mdlen > NSH_CTX_HDRS_MAX_LEN || mdlen <= 0) { 1436 OVS_NLERR( 1437 log, 1438 "Invalid MD length %d for MD type %d", 1439 mdlen, 1440 mdtype 1441 ); 1442 return -EINVAL; 1443 } 1444 break; 1445 default: 1446 OVS_NLERR(log, "Unknown nsh attribute %d", 1447 type); 1448 return -EINVAL; 1449 } 1450 } 1451 1452 if (rem > 0) { 1453 OVS_NLERR(log, "nsh attribute has %d unknown bytes.", rem); 1454 return -EINVAL; 1455 } 1456 1457 if (has_md1 && has_md2) { 1458 OVS_NLERR( 1459 1, 1460 "invalid nsh attribute: md1 and md2 are exclusive." 1461 ); 1462 return -EINVAL; 1463 } 1464 1465 if (!is_mask) { 1466 if ((has_md1 && mdtype != NSH_M_TYPE1) || 1467 (has_md2 && mdtype != NSH_M_TYPE2)) { 1468 OVS_NLERR(1, "nsh attribute has unmatched MD type %d.", 1469 mdtype); 1470 return -EINVAL; 1471 } 1472 1473 if (is_push_nsh && 1474 (!has_base || (!has_md1 && !has_md2))) { 1475 OVS_NLERR( 1476 1, 1477 "push_nsh: missing base or metadata attributes" 1478 ); 1479 return -EINVAL; 1480 } 1481 } 1482 1483 return 0; 1484} 1485 1486static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match, 1487 u64 attrs, const struct nlattr **a, 1488 bool is_mask, bool log) 1489{ 1490 int err; 1491 1492 err = metadata_from_nlattrs(net, match, &attrs, a, is_mask, log); 1493 if (err) 1494 return err; 1495 1496 if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) { 1497 const struct ovs_key_ethernet *eth_key; 1498 1499 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]); 1500 SW_FLOW_KEY_MEMCPY(match, eth.src, 1501 eth_key->eth_src, ETH_ALEN, is_mask); 1502 SW_FLOW_KEY_MEMCPY(match, eth.dst, 1503 eth_key->eth_dst, ETH_ALEN, is_mask); 1504 attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET); 1505 1506 if (attrs & (1 << OVS_KEY_ATTR_VLAN)) { 1507 /* VLAN attribute is always parsed before getting here since it 1508 * may occur multiple times. 1509 */ 1510 OVS_NLERR(log, "VLAN attribute unexpected."); 1511 return -EINVAL; 1512 } 1513 1514 if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) { 1515 err = parse_eth_type_from_nlattrs(match, &attrs, a, is_mask, 1516 log); 1517 if (err) 1518 return err; 1519 } else if (!is_mask) { 1520 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask); 1521 } 1522 } else if (!match->key->eth.type) { 1523 OVS_NLERR(log, "Either Ethernet header or EtherType is required."); 1524 return -EINVAL; 1525 } 1526 1527 if (attrs & (1 << OVS_KEY_ATTR_IPV4)) { 1528 const struct ovs_key_ipv4 *ipv4_key; 1529 1530 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]); 1531 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) { 1532 OVS_NLERR(log, "IPv4 frag type %d is out of range max %d", 1533 ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX); 1534 return -EINVAL; 1535 } 1536 SW_FLOW_KEY_PUT(match, ip.proto, 1537 ipv4_key->ipv4_proto, is_mask); 1538 SW_FLOW_KEY_PUT(match, ip.tos, 1539 ipv4_key->ipv4_tos, is_mask); 1540 SW_FLOW_KEY_PUT(match, ip.ttl, 1541 ipv4_key->ipv4_ttl, is_mask); 1542 SW_FLOW_KEY_PUT(match, ip.frag, 1543 ipv4_key->ipv4_frag, is_mask); 1544 SW_FLOW_KEY_PUT(match, ipv4.addr.src, 1545 ipv4_key->ipv4_src, is_mask); 1546 SW_FLOW_KEY_PUT(match, ipv4.addr.dst, 1547 ipv4_key->ipv4_dst, is_mask); 1548 attrs &= ~(1 << OVS_KEY_ATTR_IPV4); 1549 } 1550 1551 if (attrs & (1 << OVS_KEY_ATTR_IPV6)) { 1552 const struct ovs_key_ipv6 *ipv6_key; 1553 1554 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]); 1555 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) { 1556 OVS_NLERR(log, "IPv6 frag type %d is out of range max %d", 1557 ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX); 1558 return -EINVAL; 1559 } 1560 1561 if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) { 1562 OVS_NLERR(log, "IPv6 flow label %x is out of range (max=%x)", 1563 ntohl(ipv6_key->ipv6_label), (1 << 20) - 1); 1564 return -EINVAL; 1565 } 1566 1567 SW_FLOW_KEY_PUT(match, ipv6.label, 1568 ipv6_key->ipv6_label, is_mask); 1569 SW_FLOW_KEY_PUT(match, ip.proto, 1570 ipv6_key->ipv6_proto, is_mask); 1571 SW_FLOW_KEY_PUT(match, ip.tos, 1572 ipv6_key->ipv6_tclass, is_mask); 1573 SW_FLOW_KEY_PUT(match, ip.ttl, 1574 ipv6_key->ipv6_hlimit, is_mask); 1575 SW_FLOW_KEY_PUT(match, ip.frag, 1576 ipv6_key->ipv6_frag, is_mask); 1577 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src, 1578 ipv6_key->ipv6_src, 1579 sizeof(match->key->ipv6.addr.src), 1580 is_mask); 1581 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst, 1582 ipv6_key->ipv6_dst, 1583 sizeof(match->key->ipv6.addr.dst), 1584 is_mask); 1585 1586 attrs &= ~(1 << OVS_KEY_ATTR_IPV6); 1587 } 1588 1589 if (attrs & (1ULL << OVS_KEY_ATTR_IPV6_EXTHDRS)) { 1590 const struct ovs_key_ipv6_exthdrs *ipv6_exthdrs_key; 1591 1592 ipv6_exthdrs_key = nla_data(a[OVS_KEY_ATTR_IPV6_EXTHDRS]); 1593 1594 SW_FLOW_KEY_PUT(match, ipv6.exthdrs, 1595 ipv6_exthdrs_key->hdrs, is_mask); 1596 1597 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6_EXTHDRS); 1598 } 1599 1600 if (attrs & (1 << OVS_KEY_ATTR_ARP)) { 1601 const struct ovs_key_arp *arp_key; 1602 1603 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]); 1604 if (!is_mask && (arp_key->arp_op & htons(0xff00))) { 1605 OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).", 1606 arp_key->arp_op); 1607 return -EINVAL; 1608 } 1609 1610 SW_FLOW_KEY_PUT(match, ipv4.addr.src, 1611 arp_key->arp_sip, is_mask); 1612 SW_FLOW_KEY_PUT(match, ipv4.addr.dst, 1613 arp_key->arp_tip, is_mask); 1614 SW_FLOW_KEY_PUT(match, ip.proto, 1615 ntohs(arp_key->arp_op), is_mask); 1616 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha, 1617 arp_key->arp_sha, ETH_ALEN, is_mask); 1618 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha, 1619 arp_key->arp_tha, ETH_ALEN, is_mask); 1620 1621 attrs &= ~(1 << OVS_KEY_ATTR_ARP); 1622 } 1623 1624 if (attrs & (1 << OVS_KEY_ATTR_NSH)) { 1625 if (nsh_key_put_from_nlattr(a[OVS_KEY_ATTR_NSH], match, 1626 is_mask, false, log) < 0) 1627 return -EINVAL; 1628 attrs &= ~(1 << OVS_KEY_ATTR_NSH); 1629 } 1630 1631 if (attrs & (1 << OVS_KEY_ATTR_MPLS)) { 1632 const struct ovs_key_mpls *mpls_key; 1633 u32 hdr_len; 1634 u32 label_count, label_count_mask, i; 1635 1636 mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]); 1637 hdr_len = nla_len(a[OVS_KEY_ATTR_MPLS]); 1638 label_count = hdr_len / sizeof(struct ovs_key_mpls); 1639 1640 if (label_count == 0 || label_count > MPLS_LABEL_DEPTH || 1641 hdr_len % sizeof(struct ovs_key_mpls)) 1642 return -EINVAL; 1643 1644 label_count_mask = GENMASK(label_count - 1, 0); 1645 1646 for (i = 0 ; i < label_count; i++) 1647 SW_FLOW_KEY_PUT(match, mpls.lse[i], 1648 mpls_key[i].mpls_lse, is_mask); 1649 1650 SW_FLOW_KEY_PUT(match, mpls.num_labels_mask, 1651 label_count_mask, is_mask); 1652 1653 attrs &= ~(1 << OVS_KEY_ATTR_MPLS); 1654 } 1655 1656 if (attrs & (1 << OVS_KEY_ATTR_TCP)) { 1657 const struct ovs_key_tcp *tcp_key; 1658 1659 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); 1660 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask); 1661 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask); 1662 attrs &= ~(1 << OVS_KEY_ATTR_TCP); 1663 } 1664 1665 if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) { 1666 SW_FLOW_KEY_PUT(match, tp.flags, 1667 nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]), 1668 is_mask); 1669 attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS); 1670 } 1671 1672 if (attrs & (1 << OVS_KEY_ATTR_UDP)) { 1673 const struct ovs_key_udp *udp_key; 1674 1675 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); 1676 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask); 1677 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask); 1678 attrs &= ~(1 << OVS_KEY_ATTR_UDP); 1679 } 1680 1681 if (attrs & (1 << OVS_KEY_ATTR_SCTP)) { 1682 const struct ovs_key_sctp *sctp_key; 1683 1684 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]); 1685 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask); 1686 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask); 1687 attrs &= ~(1 << OVS_KEY_ATTR_SCTP); 1688 } 1689 1690 if (attrs & (1 << OVS_KEY_ATTR_ICMP)) { 1691 const struct ovs_key_icmp *icmp_key; 1692 1693 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]); 1694 SW_FLOW_KEY_PUT(match, tp.src, 1695 htons(icmp_key->icmp_type), is_mask); 1696 SW_FLOW_KEY_PUT(match, tp.dst, 1697 htons(icmp_key->icmp_code), is_mask); 1698 attrs &= ~(1 << OVS_KEY_ATTR_ICMP); 1699 } 1700 1701 if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) { 1702 const struct ovs_key_icmpv6 *icmpv6_key; 1703 1704 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]); 1705 SW_FLOW_KEY_PUT(match, tp.src, 1706 htons(icmpv6_key->icmpv6_type), is_mask); 1707 SW_FLOW_KEY_PUT(match, tp.dst, 1708 htons(icmpv6_key->icmpv6_code), is_mask); 1709 attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6); 1710 } 1711 1712 if (attrs & (1 << OVS_KEY_ATTR_ND)) { 1713 const struct ovs_key_nd *nd_key; 1714 1715 nd_key = nla_data(a[OVS_KEY_ATTR_ND]); 1716 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target, 1717 nd_key->nd_target, 1718 sizeof(match->key->ipv6.nd.target), 1719 is_mask); 1720 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll, 1721 nd_key->nd_sll, ETH_ALEN, is_mask); 1722 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll, 1723 nd_key->nd_tll, ETH_ALEN, is_mask); 1724 attrs &= ~(1 << OVS_KEY_ATTR_ND); 1725 } 1726 1727 if (attrs != 0) { 1728 OVS_NLERR(log, "Unknown key attributes %llx", 1729 (unsigned long long)attrs); 1730 return -EINVAL; 1731 } 1732 1733 return 0; 1734} 1735 1736static void nlattr_set(struct nlattr *attr, u8 val, 1737 const struct ovs_len_tbl *tbl) 1738{ 1739 struct nlattr *nla; 1740 int rem; 1741 1742 /* The nlattr stream should already have been validated */ 1743 nla_for_each_nested(nla, attr, rem) { 1744 if (tbl[nla_type(nla)].len == OVS_ATTR_NESTED) 1745 nlattr_set(nla, val, tbl[nla_type(nla)].next ? : tbl); 1746 else 1747 memset(nla_data(nla), val, nla_len(nla)); 1748 1749 if (nla_type(nla) == OVS_KEY_ATTR_CT_STATE) 1750 *(u32 *)nla_data(nla) &= CT_SUPPORTED_MASK; 1751 } 1752} 1753 1754static void mask_set_nlattr(struct nlattr *attr, u8 val) 1755{ 1756 nlattr_set(attr, val, ovs_key_lens); 1757} 1758 1759/** 1760 * ovs_nla_get_match - parses Netlink attributes into a flow key and 1761 * mask. In case the 'mask' is NULL, the flow is treated as exact match 1762 * flow. Otherwise, it is treated as a wildcarded flow, except the mask 1763 * does not include any don't care bit. 1764 * @net: Used to determine per-namespace field support. 1765 * @match: receives the extracted flow match information. 1766 * @nla_key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute 1767 * sequence. The fields should of the packet that triggered the creation 1768 * of this flow. 1769 * @nla_mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* 1770 * Netlink attribute specifies the mask field of the wildcarded flow. 1771 * @log: Boolean to allow kernel error logging. Normally true, but when 1772 * probing for feature compatibility this should be passed in as false to 1773 * suppress unnecessary error logging. 1774 */ 1775int ovs_nla_get_match(struct net *net, struct sw_flow_match *match, 1776 const struct nlattr *nla_key, 1777 const struct nlattr *nla_mask, 1778 bool log) 1779{ 1780 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; 1781 struct nlattr *newmask = NULL; 1782 u64 key_attrs = 0; 1783 u64 mask_attrs = 0; 1784 int err; 1785 1786 err = parse_flow_nlattrs(nla_key, a, &key_attrs, log); 1787 if (err) 1788 return err; 1789 1790 err = parse_vlan_from_nlattrs(match, &key_attrs, a, false, log); 1791 if (err) 1792 return err; 1793 1794 err = ovs_key_from_nlattrs(net, match, key_attrs, a, false, log); 1795 if (err) 1796 return err; 1797 1798 if (match->mask) { 1799 if (!nla_mask) { 1800 /* Create an exact match mask. We need to set to 0xff 1801 * all the 'match->mask' fields that have been touched 1802 * in 'match->key'. We cannot simply memset 1803 * 'match->mask', because padding bytes and fields not 1804 * specified in 'match->key' should be left to 0. 1805 * Instead, we use a stream of netlink attributes, 1806 * copied from 'key' and set to 0xff. 1807 * ovs_key_from_nlattrs() will take care of filling 1808 * 'match->mask' appropriately. 1809 */ 1810 newmask = kmemdup(nla_key, 1811 nla_total_size(nla_len(nla_key)), 1812 GFP_KERNEL); 1813 if (!newmask) 1814 return -ENOMEM; 1815 1816 mask_set_nlattr(newmask, 0xff); 1817 1818 /* The userspace does not send tunnel attributes that 1819 * are 0, but we should not wildcard them nonetheless. 1820 */ 1821 if (match->key->tun_proto) 1822 SW_FLOW_KEY_MEMSET_FIELD(match, tun_key, 1823 0xff, true); 1824 1825 nla_mask = newmask; 1826 } 1827 1828 err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log); 1829 if (err) 1830 goto free_newmask; 1831 1832 /* Always match on tci. */ 1833 SW_FLOW_KEY_PUT(match, eth.vlan.tci, htons(0xffff), true); 1834 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, htons(0xffff), true); 1835 1836 err = parse_vlan_from_nlattrs(match, &mask_attrs, a, true, log); 1837 if (err) 1838 goto free_newmask; 1839 1840 err = ovs_key_from_nlattrs(net, match, mask_attrs, a, true, 1841 log); 1842 if (err) 1843 goto free_newmask; 1844 } 1845 1846 if (!match_validate(match, key_attrs, mask_attrs, log)) 1847 err = -EINVAL; 1848 1849free_newmask: 1850 kfree(newmask); 1851 return err; 1852} 1853 1854static size_t get_ufid_len(const struct nlattr *attr, bool log) 1855{ 1856 size_t len; 1857 1858 if (!attr) 1859 return 0; 1860 1861 len = nla_len(attr); 1862 if (len < 1 || len > MAX_UFID_LENGTH) { 1863 OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)", 1864 nla_len(attr), MAX_UFID_LENGTH); 1865 return 0; 1866 } 1867 1868 return len; 1869} 1870 1871/* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID, 1872 * or false otherwise. 1873 */ 1874bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr, 1875 bool log) 1876{ 1877 sfid->ufid_len = get_ufid_len(attr, log); 1878 if (sfid->ufid_len) 1879 memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len); 1880 1881 return sfid->ufid_len; 1882} 1883 1884int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid, 1885 const struct sw_flow_key *key, bool log) 1886{ 1887 struct sw_flow_key *new_key; 1888 1889 if (ovs_nla_get_ufid(sfid, ufid, log)) 1890 return 0; 1891 1892 /* If UFID was not provided, use unmasked key. */ 1893 new_key = kmalloc(sizeof(*new_key), GFP_KERNEL); 1894 if (!new_key) 1895 return -ENOMEM; 1896 memcpy(new_key, key, sizeof(*key)); 1897 sfid->unmasked_key = new_key; 1898 1899 return 0; 1900} 1901 1902u32 ovs_nla_get_ufid_flags(const struct nlattr *attr) 1903{ 1904 return nla_get_u32_default(attr, 0); 1905} 1906 1907/** 1908 * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key. 1909 * @net: Network namespace. 1910 * @key: Receives extracted in_port, priority, tun_key, skb_mark and conntrack 1911 * metadata. 1912 * @a: Array of netlink attributes holding parsed %OVS_KEY_ATTR_* Netlink 1913 * attributes. 1914 * @attrs: Bit mask for the netlink attributes included in @a. 1915 * @log: Boolean to allow kernel error logging. Normally true, but when 1916 * probing for feature compatibility this should be passed in as false to 1917 * suppress unnecessary error logging. 1918 * 1919 * This parses a series of Netlink attributes that form a flow key, which must 1920 * take the same form accepted by flow_from_nlattrs(), but only enough of it to 1921 * get the metadata, that is, the parts of the flow key that cannot be 1922 * extracted from the packet itself. 1923 * 1924 * This must be called before the packet key fields are filled in 'key'. 1925 */ 1926 1927int ovs_nla_get_flow_metadata(struct net *net, 1928 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1], 1929 u64 attrs, struct sw_flow_key *key, bool log) 1930{ 1931 struct sw_flow_match match; 1932 1933 memset(&match, 0, sizeof(match)); 1934 match.key = key; 1935 1936 key->ct_state = 0; 1937 key->ct_zone = 0; 1938 key->ct_orig_proto = 0; 1939 memset(&key->ct, 0, sizeof(key->ct)); 1940 memset(&key->ipv4.ct_orig, 0, sizeof(key->ipv4.ct_orig)); 1941 memset(&key->ipv6.ct_orig, 0, sizeof(key->ipv6.ct_orig)); 1942 1943 key->phy.in_port = DP_MAX_PORTS; 1944 1945 return metadata_from_nlattrs(net, &match, &attrs, a, false, log); 1946} 1947 1948static int ovs_nla_put_vlan(struct sk_buff *skb, const struct vlan_head *vh, 1949 bool is_mask) 1950{ 1951 __be16 eth_type = !is_mask ? vh->tpid : htons(0xffff); 1952 1953 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) || 1954 nla_put_be16(skb, OVS_KEY_ATTR_VLAN, vh->tci)) 1955 return -EMSGSIZE; 1956 return 0; 1957} 1958 1959static int nsh_key_to_nlattr(const struct ovs_key_nsh *nsh, bool is_mask, 1960 struct sk_buff *skb) 1961{ 1962 struct nlattr *start; 1963 1964 start = nla_nest_start_noflag(skb, OVS_KEY_ATTR_NSH); 1965 if (!start) 1966 return -EMSGSIZE; 1967 1968 if (nla_put(skb, OVS_NSH_KEY_ATTR_BASE, sizeof(nsh->base), &nsh->base)) 1969 goto nla_put_failure; 1970 1971 if (is_mask || nsh->base.mdtype == NSH_M_TYPE1) { 1972 if (nla_put(skb, OVS_NSH_KEY_ATTR_MD1, 1973 sizeof(nsh->context), nsh->context)) 1974 goto nla_put_failure; 1975 } 1976 1977 /* Don't support MD type 2 yet */ 1978 1979 nla_nest_end(skb, start); 1980 1981 return 0; 1982 1983nla_put_failure: 1984 return -EMSGSIZE; 1985} 1986 1987static int __ovs_nla_put_key(const struct sw_flow_key *swkey, 1988 const struct sw_flow_key *output, bool is_mask, 1989 struct sk_buff *skb) 1990{ 1991 struct ovs_key_ethernet *eth_key; 1992 struct nlattr *nla; 1993 struct nlattr *encap = NULL; 1994 struct nlattr *in_encap = NULL; 1995 1996 if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id)) 1997 goto nla_put_failure; 1998 1999 if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash)) 2000 goto nla_put_failure; 2001 2002 if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority)) 2003 goto nla_put_failure; 2004 2005 if ((swkey->tun_proto || is_mask)) { 2006 const void *opts = NULL; 2007 2008 if (ip_tunnel_is_options_present(output->tun_key.tun_flags)) 2009 opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len); 2010 2011 if (ip_tun_to_nlattr(skb, &output->tun_key, opts, 2012 swkey->tun_opts_len, swkey->tun_proto, 0)) 2013 goto nla_put_failure; 2014 } 2015 2016 if (swkey->phy.in_port == DP_MAX_PORTS) { 2017 if (is_mask && (output->phy.in_port == 0xffff)) 2018 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff)) 2019 goto nla_put_failure; 2020 } else { 2021 u16 upper_u16; 2022 upper_u16 = !is_mask ? 0 : 0xffff; 2023 2024 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 2025 (upper_u16 << 16) | output->phy.in_port)) 2026 goto nla_put_failure; 2027 } 2028 2029 if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark)) 2030 goto nla_put_failure; 2031 2032 if (ovs_ct_put_key(swkey, output, skb)) 2033 goto nla_put_failure; 2034 2035 if (ovs_key_mac_proto(swkey) == MAC_PROTO_ETHERNET) { 2036 nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key)); 2037 if (!nla) 2038 goto nla_put_failure; 2039 2040 eth_key = nla_data(nla); 2041 ether_addr_copy(eth_key->eth_src, output->eth.src); 2042 ether_addr_copy(eth_key->eth_dst, output->eth.dst); 2043 2044 if (swkey->eth.vlan.tci || eth_type_vlan(swkey->eth.type)) { 2045 if (ovs_nla_put_vlan(skb, &output->eth.vlan, is_mask)) 2046 goto nla_put_failure; 2047 encap = nla_nest_start_noflag(skb, OVS_KEY_ATTR_ENCAP); 2048 if (!swkey->eth.vlan.tci) 2049 goto unencap; 2050 2051 if (swkey->eth.cvlan.tci || eth_type_vlan(swkey->eth.type)) { 2052 if (ovs_nla_put_vlan(skb, &output->eth.cvlan, is_mask)) 2053 goto nla_put_failure; 2054 in_encap = nla_nest_start_noflag(skb, 2055 OVS_KEY_ATTR_ENCAP); 2056 if (!swkey->eth.cvlan.tci) 2057 goto unencap; 2058 } 2059 } 2060 2061 if (swkey->eth.type == htons(ETH_P_802_2)) { 2062 /* 2063 * Ethertype 802.2 is represented in the netlink with omitted 2064 * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and 2065 * 0xffff in the mask attribute. Ethertype can also 2066 * be wildcarded. 2067 */ 2068 if (is_mask && output->eth.type) 2069 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, 2070 output->eth.type)) 2071 goto nla_put_failure; 2072 goto unencap; 2073 } 2074 } 2075 2076 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type)) 2077 goto nla_put_failure; 2078 2079 if (eth_type_vlan(swkey->eth.type)) { 2080 /* There are 3 VLAN tags, we don't know anything about the rest 2081 * of the packet, so truncate here. 2082 */ 2083 WARN_ON_ONCE(!(encap && in_encap)); 2084 goto unencap; 2085 } 2086 2087 if (swkey->eth.type == htons(ETH_P_IP)) { 2088 struct ovs_key_ipv4 *ipv4_key; 2089 2090 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key)); 2091 if (!nla) 2092 goto nla_put_failure; 2093 ipv4_key = nla_data(nla); 2094 ipv4_key->ipv4_src = output->ipv4.addr.src; 2095 ipv4_key->ipv4_dst = output->ipv4.addr.dst; 2096 ipv4_key->ipv4_proto = output->ip.proto; 2097 ipv4_key->ipv4_tos = output->ip.tos; 2098 ipv4_key->ipv4_ttl = output->ip.ttl; 2099 ipv4_key->ipv4_frag = output->ip.frag; 2100 } else if (swkey->eth.type == htons(ETH_P_IPV6)) { 2101 struct ovs_key_ipv6 *ipv6_key; 2102 struct ovs_key_ipv6_exthdrs *ipv6_exthdrs_key; 2103 2104 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key)); 2105 if (!nla) 2106 goto nla_put_failure; 2107 ipv6_key = nla_data(nla); 2108 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src, 2109 sizeof(ipv6_key->ipv6_src)); 2110 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst, 2111 sizeof(ipv6_key->ipv6_dst)); 2112 ipv6_key->ipv6_label = output->ipv6.label; 2113 ipv6_key->ipv6_proto = output->ip.proto; 2114 ipv6_key->ipv6_tclass = output->ip.tos; 2115 ipv6_key->ipv6_hlimit = output->ip.ttl; 2116 ipv6_key->ipv6_frag = output->ip.frag; 2117 2118 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6_EXTHDRS, 2119 sizeof(*ipv6_exthdrs_key)); 2120 if (!nla) 2121 goto nla_put_failure; 2122 ipv6_exthdrs_key = nla_data(nla); 2123 ipv6_exthdrs_key->hdrs = output->ipv6.exthdrs; 2124 } else if (swkey->eth.type == htons(ETH_P_NSH)) { 2125 if (nsh_key_to_nlattr(&output->nsh, is_mask, skb)) 2126 goto nla_put_failure; 2127 } else if (swkey->eth.type == htons(ETH_P_ARP) || 2128 swkey->eth.type == htons(ETH_P_RARP)) { 2129 struct ovs_key_arp *arp_key; 2130 2131 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key)); 2132 if (!nla) 2133 goto nla_put_failure; 2134 arp_key = nla_data(nla); 2135 memset(arp_key, 0, sizeof(struct ovs_key_arp)); 2136 arp_key->arp_sip = output->ipv4.addr.src; 2137 arp_key->arp_tip = output->ipv4.addr.dst; 2138 arp_key->arp_op = htons(output->ip.proto); 2139 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha); 2140 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha); 2141 } else if (eth_p_mpls(swkey->eth.type)) { 2142 u8 i, num_labels; 2143 struct ovs_key_mpls *mpls_key; 2144 2145 num_labels = hweight_long(output->mpls.num_labels_mask); 2146 nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS, 2147 num_labels * sizeof(*mpls_key)); 2148 if (!nla) 2149 goto nla_put_failure; 2150 2151 mpls_key = nla_data(nla); 2152 for (i = 0; i < num_labels; i++) 2153 mpls_key[i].mpls_lse = output->mpls.lse[i]; 2154 } 2155 2156 if ((swkey->eth.type == htons(ETH_P_IP) || 2157 swkey->eth.type == htons(ETH_P_IPV6)) && 2158 swkey->ip.frag != OVS_FRAG_TYPE_LATER) { 2159 2160 if (swkey->ip.proto == IPPROTO_TCP) { 2161 struct ovs_key_tcp *tcp_key; 2162 2163 nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key)); 2164 if (!nla) 2165 goto nla_put_failure; 2166 tcp_key = nla_data(nla); 2167 tcp_key->tcp_src = output->tp.src; 2168 tcp_key->tcp_dst = output->tp.dst; 2169 if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS, 2170 output->tp.flags)) 2171 goto nla_put_failure; 2172 } else if (swkey->ip.proto == IPPROTO_UDP) { 2173 struct ovs_key_udp *udp_key; 2174 2175 nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key)); 2176 if (!nla) 2177 goto nla_put_failure; 2178 udp_key = nla_data(nla); 2179 udp_key->udp_src = output->tp.src; 2180 udp_key->udp_dst = output->tp.dst; 2181 } else if (swkey->ip.proto == IPPROTO_SCTP) { 2182 struct ovs_key_sctp *sctp_key; 2183 2184 nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key)); 2185 if (!nla) 2186 goto nla_put_failure; 2187 sctp_key = nla_data(nla); 2188 sctp_key->sctp_src = output->tp.src; 2189 sctp_key->sctp_dst = output->tp.dst; 2190 } else if (swkey->eth.type == htons(ETH_P_IP) && 2191 swkey->ip.proto == IPPROTO_ICMP) { 2192 struct ovs_key_icmp *icmp_key; 2193 2194 nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key)); 2195 if (!nla) 2196 goto nla_put_failure; 2197 icmp_key = nla_data(nla); 2198 icmp_key->icmp_type = ntohs(output->tp.src); 2199 icmp_key->icmp_code = ntohs(output->tp.dst); 2200 } else if (swkey->eth.type == htons(ETH_P_IPV6) && 2201 swkey->ip.proto == IPPROTO_ICMPV6) { 2202 struct ovs_key_icmpv6 *icmpv6_key; 2203 2204 nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6, 2205 sizeof(*icmpv6_key)); 2206 if (!nla) 2207 goto nla_put_failure; 2208 icmpv6_key = nla_data(nla); 2209 icmpv6_key->icmpv6_type = ntohs(output->tp.src); 2210 icmpv6_key->icmpv6_code = ntohs(output->tp.dst); 2211 2212 if (swkey->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) || 2213 swkey->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) { 2214 struct ovs_key_nd *nd_key; 2215 2216 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key)); 2217 if (!nla) 2218 goto nla_put_failure; 2219 nd_key = nla_data(nla); 2220 memcpy(nd_key->nd_target, &output->ipv6.nd.target, 2221 sizeof(nd_key->nd_target)); 2222 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll); 2223 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll); 2224 } 2225 } 2226 } 2227 2228unencap: 2229 if (in_encap) 2230 nla_nest_end(skb, in_encap); 2231 if (encap) 2232 nla_nest_end(skb, encap); 2233 2234 return 0; 2235 2236nla_put_failure: 2237 return -EMSGSIZE; 2238} 2239 2240int ovs_nla_put_key(const struct sw_flow_key *swkey, 2241 const struct sw_flow_key *output, int attr, bool is_mask, 2242 struct sk_buff *skb) 2243{ 2244 int err; 2245 struct nlattr *nla; 2246 2247 nla = nla_nest_start_noflag(skb, attr); 2248 if (!nla) 2249 return -EMSGSIZE; 2250 err = __ovs_nla_put_key(swkey, output, is_mask, skb); 2251 if (err) 2252 return err; 2253 nla_nest_end(skb, nla); 2254 2255 return 0; 2256} 2257 2258/* Called with ovs_mutex or RCU read lock. */ 2259int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb) 2260{ 2261 if (ovs_identifier_is_ufid(&flow->id)) 2262 return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len, 2263 flow->id.ufid); 2264 2265 return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key, 2266 OVS_FLOW_ATTR_KEY, false, skb); 2267} 2268 2269/* Called with ovs_mutex or RCU read lock. */ 2270int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb) 2271{ 2272 return ovs_nla_put_key(&flow->key, &flow->key, 2273 OVS_FLOW_ATTR_KEY, false, skb); 2274} 2275 2276/* Called with ovs_mutex or RCU read lock. */ 2277int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb) 2278{ 2279 return ovs_nla_put_key(&flow->key, &flow->mask->key, 2280 OVS_FLOW_ATTR_MASK, true, skb); 2281} 2282 2283static struct sw_flow_actions *nla_alloc_flow_actions(int size) 2284{ 2285 struct sw_flow_actions *sfa; 2286 2287 sfa = kmalloc(kmalloc_size_roundup(sizeof(*sfa) + size), GFP_KERNEL); 2288 if (!sfa) 2289 return ERR_PTR(-ENOMEM); 2290 2291 sfa->actions_len = 0; 2292 return sfa; 2293} 2294 2295static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len); 2296 2297static void ovs_nla_free_check_pkt_len_action(const struct nlattr *action) 2298{ 2299 const struct nlattr *a; 2300 int rem; 2301 2302 nla_for_each_nested(a, action, rem) { 2303 switch (nla_type(a)) { 2304 case OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL: 2305 case OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER: 2306 ovs_nla_free_nested_actions(nla_data(a), nla_len(a)); 2307 break; 2308 } 2309 } 2310} 2311 2312static void ovs_nla_free_clone_action(const struct nlattr *action) 2313{ 2314 const struct nlattr *a = nla_data(action); 2315 int rem = nla_len(action); 2316 2317 switch (nla_type(a)) { 2318 case OVS_CLONE_ATTR_EXEC: 2319 /* The real list of actions follows this attribute. */ 2320 a = nla_next(a, &rem); 2321 ovs_nla_free_nested_actions(a, rem); 2322 break; 2323 } 2324} 2325 2326static void ovs_nla_free_dec_ttl_action(const struct nlattr *action) 2327{ 2328 const struct nlattr *a = nla_data(action); 2329 2330 switch (nla_type(a)) { 2331 case OVS_DEC_TTL_ATTR_ACTION: 2332 ovs_nla_free_nested_actions(nla_data(a), nla_len(a)); 2333 break; 2334 } 2335} 2336 2337static void ovs_nla_free_sample_action(const struct nlattr *action) 2338{ 2339 const struct nlattr *a = nla_data(action); 2340 int rem = nla_len(action); 2341 2342 switch (nla_type(a)) { 2343 case OVS_SAMPLE_ATTR_ARG: 2344 /* The real list of actions follows this attribute. */ 2345 a = nla_next(a, &rem); 2346 ovs_nla_free_nested_actions(a, rem); 2347 break; 2348 } 2349} 2350 2351static void ovs_nla_free_set_action(const struct nlattr *a) 2352{ 2353 const struct nlattr *ovs_key = nla_data(a); 2354 struct ovs_tunnel_info *ovs_tun; 2355 2356 switch (nla_type(ovs_key)) { 2357 case OVS_KEY_ATTR_TUNNEL_INFO: 2358 ovs_tun = nla_data(ovs_key); 2359 dst_release((struct dst_entry *)ovs_tun->tun_dst); 2360 break; 2361 } 2362} 2363 2364static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len) 2365{ 2366 const struct nlattr *a; 2367 int rem; 2368 2369 /* Whenever new actions are added, the need to update this 2370 * function should be considered. 2371 */ 2372 BUILD_BUG_ON(OVS_ACTION_ATTR_MAX != 25); 2373 2374 if (!actions) 2375 return; 2376 2377 nla_for_each_attr(a, actions, len, rem) { 2378 switch (nla_type(a)) { 2379 case OVS_ACTION_ATTR_CHECK_PKT_LEN: 2380 ovs_nla_free_check_pkt_len_action(a); 2381 break; 2382 2383 case OVS_ACTION_ATTR_CLONE: 2384 ovs_nla_free_clone_action(a); 2385 break; 2386 2387 case OVS_ACTION_ATTR_CT: 2388 ovs_ct_free_action(a); 2389 break; 2390 2391 case OVS_ACTION_ATTR_DEC_TTL: 2392 ovs_nla_free_dec_ttl_action(a); 2393 break; 2394 2395 case OVS_ACTION_ATTR_SAMPLE: 2396 ovs_nla_free_sample_action(a); 2397 break; 2398 2399 case OVS_ACTION_ATTR_SET: 2400 ovs_nla_free_set_action(a); 2401 break; 2402 } 2403 } 2404} 2405 2406void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts) 2407{ 2408 if (!sf_acts) 2409 return; 2410 2411 ovs_nla_free_nested_actions(sf_acts->actions, sf_acts->actions_len); 2412 kfree(sf_acts); 2413} 2414 2415static void __ovs_nla_free_flow_actions(struct rcu_head *head) 2416{ 2417 ovs_nla_free_flow_actions(container_of(head, struct sw_flow_actions, rcu)); 2418} 2419 2420/* Schedules 'sf_acts' to be freed after the next RCU grace period. 2421 * The caller must hold rcu_read_lock for this to be sensible. */ 2422void ovs_nla_free_flow_actions_rcu(struct sw_flow_actions *sf_acts) 2423{ 2424 call_rcu(&sf_acts->rcu, __ovs_nla_free_flow_actions); 2425} 2426 2427static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, 2428 int attr_len, bool log) 2429{ 2430 2431 struct sw_flow_actions *acts; 2432 int new_acts_size; 2433 size_t req_size = NLA_ALIGN(attr_len); 2434 int next_offset = offsetof(struct sw_flow_actions, actions) + 2435 (*sfa)->actions_len; 2436 2437 if (req_size <= (ksize(*sfa) - next_offset)) 2438 goto out; 2439 2440 new_acts_size = max(next_offset + req_size, ksize(*sfa) * 2); 2441 2442 acts = nla_alloc_flow_actions(new_acts_size); 2443 if (IS_ERR(acts)) 2444 return ERR_CAST(acts); 2445 2446 memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len); 2447 acts->actions_len = (*sfa)->actions_len; 2448 acts->orig_len = (*sfa)->orig_len; 2449 kfree(*sfa); 2450 *sfa = acts; 2451 2452out: 2453 (*sfa)->actions_len += req_size; 2454 return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset); 2455} 2456 2457static struct nlattr *__add_action(struct sw_flow_actions **sfa, 2458 int attrtype, void *data, int len, bool log) 2459{ 2460 struct nlattr *a; 2461 2462 a = reserve_sfa_size(sfa, nla_attr_size(len), log); 2463 if (IS_ERR(a)) 2464 return a; 2465 2466 a->nla_type = attrtype; 2467 a->nla_len = nla_attr_size(len); 2468 2469 if (data) 2470 memcpy(nla_data(a), data, len); 2471 memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len)); 2472 2473 return a; 2474} 2475 2476int ovs_nla_add_action(struct sw_flow_actions **sfa, int attrtype, void *data, 2477 int len, bool log) 2478{ 2479 struct nlattr *a; 2480 2481 a = __add_action(sfa, attrtype, data, len, log); 2482 2483 return PTR_ERR_OR_ZERO(a); 2484} 2485 2486static inline int add_nested_action_start(struct sw_flow_actions **sfa, 2487 int attrtype, bool log) 2488{ 2489 int used = (*sfa)->actions_len; 2490 int err; 2491 2492 err = ovs_nla_add_action(sfa, attrtype, NULL, 0, log); 2493 if (err) 2494 return err; 2495 2496 return used; 2497} 2498 2499static inline void add_nested_action_end(struct sw_flow_actions *sfa, 2500 int st_offset) 2501{ 2502 struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + 2503 st_offset); 2504 2505 a->nla_len = sfa->actions_len - st_offset; 2506} 2507 2508static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, 2509 const struct sw_flow_key *key, 2510 struct sw_flow_actions **sfa, 2511 __be16 eth_type, __be16 vlan_tci, 2512 u32 mpls_label_count, bool log, 2513 u32 depth); 2514 2515static int validate_and_copy_sample(struct net *net, const struct nlattr *attr, 2516 const struct sw_flow_key *key, 2517 struct sw_flow_actions **sfa, 2518 __be16 eth_type, __be16 vlan_tci, 2519 u32 mpls_label_count, bool log, bool last, 2520 u32 depth) 2521{ 2522 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; 2523 const struct nlattr *probability, *actions; 2524 const struct nlattr *a; 2525 int rem, start, err; 2526 struct sample_arg arg; 2527 2528 memset(attrs, 0, sizeof(attrs)); 2529 nla_for_each_nested(a, attr, rem) { 2530 int type = nla_type(a); 2531 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) 2532 return -EINVAL; 2533 attrs[type] = a; 2534 } 2535 if (rem) 2536 return -EINVAL; 2537 2538 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; 2539 if (!probability || nla_len(probability) != sizeof(u32)) 2540 return -EINVAL; 2541 2542 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; 2543 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) 2544 return -EINVAL; 2545 2546 /* validation done, copy sample action. */ 2547 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log); 2548 if (start < 0) 2549 return start; 2550 2551 /* When both skb and flow may be changed, put the sample 2552 * into a deferred fifo. On the other hand, if only skb 2553 * may be modified, the actions can be executed in place. 2554 * 2555 * Do this analysis at the flow installation time. 2556 * Set 'clone_action->exec' to true if the actions can be 2557 * executed without being deferred. 2558 * 2559 * If the sample is the last action, it can always be excuted 2560 * rather than deferred. 2561 */ 2562 arg.exec = last || !actions_may_change_flow(actions); 2563 arg.probability = nla_get_u32(probability); 2564 2565 err = ovs_nla_add_action(sfa, OVS_SAMPLE_ATTR_ARG, &arg, sizeof(arg), 2566 log); 2567 if (err) 2568 return err; 2569 2570 err = __ovs_nla_copy_actions(net, actions, key, sfa, 2571 eth_type, vlan_tci, mpls_label_count, log, 2572 depth + 1); 2573 2574 if (err) 2575 return err; 2576 2577 add_nested_action_end(*sfa, start); 2578 2579 return 0; 2580} 2581 2582static int validate_and_copy_dec_ttl(struct net *net, 2583 const struct nlattr *attr, 2584 const struct sw_flow_key *key, 2585 struct sw_flow_actions **sfa, 2586 __be16 eth_type, __be16 vlan_tci, 2587 u32 mpls_label_count, bool log, 2588 u32 depth) 2589{ 2590 const struct nlattr *attrs[OVS_DEC_TTL_ATTR_MAX + 1]; 2591 int start, action_start, err, rem; 2592 const struct nlattr *a, *actions; 2593 2594 memset(attrs, 0, sizeof(attrs)); 2595 nla_for_each_nested(a, attr, rem) { 2596 int type = nla_type(a); 2597 2598 /* Ignore unknown attributes to be future proof. */ 2599 if (type > OVS_DEC_TTL_ATTR_MAX) 2600 continue; 2601 2602 if (!type || attrs[type]) { 2603 OVS_NLERR(log, "Duplicate or invalid key (type %d).", 2604 type); 2605 return -EINVAL; 2606 } 2607 2608 attrs[type] = a; 2609 } 2610 2611 if (rem) { 2612 OVS_NLERR(log, "Message has %d unknown bytes.", rem); 2613 return -EINVAL; 2614 } 2615 2616 actions = attrs[OVS_DEC_TTL_ATTR_ACTION]; 2617 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) { 2618 OVS_NLERR(log, "Missing valid actions attribute."); 2619 return -EINVAL; 2620 } 2621 2622 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_DEC_TTL, log); 2623 if (start < 0) 2624 return start; 2625 2626 action_start = add_nested_action_start(sfa, OVS_DEC_TTL_ATTR_ACTION, log); 2627 if (action_start < 0) 2628 return action_start; 2629 2630 err = __ovs_nla_copy_actions(net, actions, key, sfa, eth_type, 2631 vlan_tci, mpls_label_count, log, 2632 depth + 1); 2633 if (err) 2634 return err; 2635 2636 add_nested_action_end(*sfa, action_start); 2637 add_nested_action_end(*sfa, start); 2638 return 0; 2639} 2640 2641static int validate_and_copy_clone(struct net *net, 2642 const struct nlattr *attr, 2643 const struct sw_flow_key *key, 2644 struct sw_flow_actions **sfa, 2645 __be16 eth_type, __be16 vlan_tci, 2646 u32 mpls_label_count, bool log, bool last, 2647 u32 depth) 2648{ 2649 int start, err; 2650 u32 exec; 2651 2652 if (nla_len(attr) && nla_len(attr) < NLA_HDRLEN) 2653 return -EINVAL; 2654 2655 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CLONE, log); 2656 if (start < 0) 2657 return start; 2658 2659 exec = last || !actions_may_change_flow(attr); 2660 2661 err = ovs_nla_add_action(sfa, OVS_CLONE_ATTR_EXEC, &exec, 2662 sizeof(exec), log); 2663 if (err) 2664 return err; 2665 2666 err = __ovs_nla_copy_actions(net, attr, key, sfa, 2667 eth_type, vlan_tci, mpls_label_count, log, 2668 depth + 1); 2669 if (err) 2670 return err; 2671 2672 add_nested_action_end(*sfa, start); 2673 2674 return 0; 2675} 2676 2677void ovs_match_init(struct sw_flow_match *match, 2678 struct sw_flow_key *key, 2679 bool reset_key, 2680 struct sw_flow_mask *mask) 2681{ 2682 memset(match, 0, sizeof(*match)); 2683 match->key = key; 2684 match->mask = mask; 2685 2686 if (reset_key) 2687 memset(key, 0, sizeof(*key)); 2688 2689 if (mask) { 2690 memset(&mask->key, 0, sizeof(mask->key)); 2691 mask->range.start = mask->range.end = 0; 2692 } 2693} 2694 2695static int validate_geneve_opts(struct sw_flow_key *key) 2696{ 2697 struct geneve_opt *option; 2698 int opts_len = key->tun_opts_len; 2699 bool crit_opt = false; 2700 2701 option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len); 2702 while (opts_len > 0) { 2703 int len; 2704 2705 if (opts_len < sizeof(*option)) 2706 return -EINVAL; 2707 2708 len = sizeof(*option) + option->length * 4; 2709 if (len > opts_len) 2710 return -EINVAL; 2711 2712 crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE); 2713 2714 option = (struct geneve_opt *)((u8 *)option + len); 2715 opts_len -= len; 2716 } 2717 2718 if (crit_opt) 2719 __set_bit(IP_TUNNEL_CRIT_OPT_BIT, key->tun_key.tun_flags); 2720 2721 return 0; 2722} 2723 2724static int validate_and_copy_set_tun(const struct nlattr *attr, 2725 struct sw_flow_actions **sfa, bool log) 2726{ 2727 IP_TUNNEL_DECLARE_FLAGS(dst_opt_type) = { }; 2728 struct sw_flow_match match; 2729 struct sw_flow_key key; 2730 struct metadata_dst *tun_dst; 2731 struct ip_tunnel_info *tun_info; 2732 struct ovs_tunnel_info *ovs_tun; 2733 struct nlattr *a; 2734 int err = 0, start, opts_type; 2735 2736 ovs_match_init(&match, &key, true, NULL); 2737 opts_type = ip_tun_from_nlattr(nla_data(attr), &match, false, log); 2738 if (opts_type < 0) 2739 return opts_type; 2740 2741 if (key.tun_opts_len) { 2742 switch (opts_type) { 2743 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS: 2744 err = validate_geneve_opts(&key); 2745 if (err < 0) 2746 return err; 2747 2748 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, dst_opt_type); 2749 break; 2750 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS: 2751 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, dst_opt_type); 2752 break; 2753 case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS: 2754 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, dst_opt_type); 2755 break; 2756 } 2757 } 2758 2759 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log); 2760 if (start < 0) 2761 return start; 2762 2763 tun_dst = metadata_dst_alloc(key.tun_opts_len, METADATA_IP_TUNNEL, 2764 GFP_KERNEL); 2765 2766 if (!tun_dst) 2767 return -ENOMEM; 2768 2769 err = dst_cache_init(&tun_dst->u.tun_info.dst_cache, GFP_KERNEL); 2770 if (err) { 2771 dst_release((struct dst_entry *)tun_dst); 2772 return err; 2773 } 2774 2775 a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL, 2776 sizeof(*ovs_tun), log); 2777 if (IS_ERR(a)) { 2778 dst_release((struct dst_entry *)tun_dst); 2779 return PTR_ERR(a); 2780 } 2781 2782 ovs_tun = nla_data(a); 2783 ovs_tun->tun_dst = tun_dst; 2784 2785 tun_info = &tun_dst->u.tun_info; 2786 tun_info->mode = IP_TUNNEL_INFO_TX; 2787 if (key.tun_proto == AF_INET6) 2788 tun_info->mode |= IP_TUNNEL_INFO_IPV6; 2789 else if (key.tun_proto == AF_INET && key.tun_key.u.ipv4.dst == 0) 2790 tun_info->mode |= IP_TUNNEL_INFO_BRIDGE; 2791 tun_info->key = key.tun_key; 2792 2793 /* We need to store the options in the action itself since 2794 * everything else will go away after flow setup. We can append 2795 * it to tun_info and then point there. 2796 */ 2797 ip_tunnel_info_opts_set(tun_info, 2798 TUN_METADATA_OPTS(&key, key.tun_opts_len), 2799 key.tun_opts_len, dst_opt_type); 2800 add_nested_action_end(*sfa, start); 2801 2802 return err; 2803} 2804 2805static bool validate_push_nsh(const struct nlattr *a, bool log) 2806{ 2807 struct nlattr *nsh_key = nla_data(a); 2808 struct sw_flow_match match; 2809 struct sw_flow_key key; 2810 2811 /* There must be one and only one NSH header. */ 2812 if (!nla_ok(nsh_key, nla_len(a)) || 2813 nla_total_size(nla_len(nsh_key)) != nla_len(a) || 2814 nla_type(nsh_key) != OVS_KEY_ATTR_NSH) 2815 return false; 2816 2817 ovs_match_init(&match, &key, true, NULL); 2818 return !nsh_key_put_from_nlattr(nsh_key, &match, false, true, log); 2819} 2820 2821/* Return false if there are any non-masked bits set. 2822 * Mask follows data immediately, before any netlink padding. 2823 */ 2824static bool validate_masked(u8 *data, int len) 2825{ 2826 u8 *mask = data + len; 2827 2828 while (len--) 2829 if (*data++ & ~*mask++) 2830 return false; 2831 2832 return true; 2833} 2834 2835static int validate_set(const struct nlattr *a, 2836 const struct sw_flow_key *flow_key, 2837 struct sw_flow_actions **sfa, bool *skip_copy, 2838 u8 mac_proto, __be16 eth_type, bool masked, bool log) 2839{ 2840 const struct nlattr *ovs_key = nla_data(a); 2841 int key_type = nla_type(ovs_key); 2842 size_t key_len; 2843 2844 /* There can be only one key in a action */ 2845 if (!nla_ok(ovs_key, nla_len(a)) || 2846 nla_total_size(nla_len(ovs_key)) != nla_len(a)) 2847 return -EINVAL; 2848 2849 key_len = nla_len(ovs_key); 2850 if (masked) 2851 key_len /= 2; 2852 2853 if (key_type > OVS_KEY_ATTR_MAX || 2854 !check_attr_len(key_len, ovs_key_lens[key_type].len)) 2855 return -EINVAL; 2856 2857 if (masked && !validate_masked(nla_data(ovs_key), key_len)) 2858 return -EINVAL; 2859 2860 switch (key_type) { 2861 case OVS_KEY_ATTR_PRIORITY: 2862 case OVS_KEY_ATTR_SKB_MARK: 2863 case OVS_KEY_ATTR_CT_MARK: 2864 case OVS_KEY_ATTR_CT_LABELS: 2865 break; 2866 2867 case OVS_KEY_ATTR_ETHERNET: 2868 if (mac_proto != MAC_PROTO_ETHERNET) 2869 return -EINVAL; 2870 break; 2871 2872 case OVS_KEY_ATTR_TUNNEL: { 2873 int err; 2874 2875 if (masked) 2876 return -EINVAL; /* Masked tunnel set not supported. */ 2877 2878 *skip_copy = true; 2879 err = validate_and_copy_set_tun(a, sfa, log); 2880 if (err) 2881 return err; 2882 break; 2883 } 2884 case OVS_KEY_ATTR_IPV4: { 2885 const struct ovs_key_ipv4 *ipv4_key; 2886 2887 if (eth_type != htons(ETH_P_IP)) 2888 return -EINVAL; 2889 2890 ipv4_key = nla_data(ovs_key); 2891 2892 if (masked) { 2893 const struct ovs_key_ipv4 *mask = ipv4_key + 1; 2894 2895 /* Non-writeable fields. */ 2896 if (mask->ipv4_proto || mask->ipv4_frag) 2897 return -EINVAL; 2898 } else { 2899 if (ipv4_key->ipv4_proto != flow_key->ip.proto) 2900 return -EINVAL; 2901 2902 if (ipv4_key->ipv4_frag != flow_key->ip.frag) 2903 return -EINVAL; 2904 } 2905 break; 2906 } 2907 case OVS_KEY_ATTR_IPV6: { 2908 const struct ovs_key_ipv6 *ipv6_key; 2909 2910 if (eth_type != htons(ETH_P_IPV6)) 2911 return -EINVAL; 2912 2913 ipv6_key = nla_data(ovs_key); 2914 2915 if (masked) { 2916 const struct ovs_key_ipv6 *mask = ipv6_key + 1; 2917 2918 /* Non-writeable fields. */ 2919 if (mask->ipv6_proto || mask->ipv6_frag) 2920 return -EINVAL; 2921 2922 /* Invalid bits in the flow label mask? */ 2923 if (ntohl(mask->ipv6_label) & 0xFFF00000) 2924 return -EINVAL; 2925 } else { 2926 if (ipv6_key->ipv6_proto != flow_key->ip.proto) 2927 return -EINVAL; 2928 2929 if (ipv6_key->ipv6_frag != flow_key->ip.frag) 2930 return -EINVAL; 2931 } 2932 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000) 2933 return -EINVAL; 2934 2935 break; 2936 } 2937 case OVS_KEY_ATTR_TCP: 2938 if ((eth_type != htons(ETH_P_IP) && 2939 eth_type != htons(ETH_P_IPV6)) || 2940 flow_key->ip.proto != IPPROTO_TCP) 2941 return -EINVAL; 2942 2943 break; 2944 2945 case OVS_KEY_ATTR_UDP: 2946 if ((eth_type != htons(ETH_P_IP) && 2947 eth_type != htons(ETH_P_IPV6)) || 2948 flow_key->ip.proto != IPPROTO_UDP) 2949 return -EINVAL; 2950 2951 break; 2952 2953 case OVS_KEY_ATTR_MPLS: 2954 if (!eth_p_mpls(eth_type)) 2955 return -EINVAL; 2956 if (key_len != sizeof(struct ovs_key_mpls)) 2957 return -EINVAL; 2958 break; 2959 2960 case OVS_KEY_ATTR_SCTP: 2961 if ((eth_type != htons(ETH_P_IP) && 2962 eth_type != htons(ETH_P_IPV6)) || 2963 flow_key->ip.proto != IPPROTO_SCTP) 2964 return -EINVAL; 2965 2966 break; 2967 2968 default: 2969 return -EINVAL; 2970 } 2971 2972 /* Convert non-masked non-tunnel set actions to masked set actions. */ 2973 if (!masked && key_type != OVS_KEY_ATTR_TUNNEL) { 2974 int start, len = key_len * 2; 2975 struct nlattr *at; 2976 2977 *skip_copy = true; 2978 2979 start = add_nested_action_start(sfa, 2980 OVS_ACTION_ATTR_SET_TO_MASKED, 2981 log); 2982 if (start < 0) 2983 return start; 2984 2985 at = __add_action(sfa, key_type, NULL, len, log); 2986 if (IS_ERR(at)) 2987 return PTR_ERR(at); 2988 2989 memcpy(nla_data(at), nla_data(ovs_key), key_len); /* Key. */ 2990 memset(nla_data(at) + key_len, 0xff, key_len); /* Mask. */ 2991 /* Clear non-writeable bits from otherwise writeable fields. */ 2992 if (key_type == OVS_KEY_ATTR_IPV6) { 2993 struct ovs_key_ipv6 *mask = nla_data(at) + key_len; 2994 2995 mask->ipv6_label &= htonl(0x000FFFFF); 2996 } 2997 add_nested_action_end(*sfa, start); 2998 } 2999 3000 return 0; 3001} 3002 3003static int validate_userspace(const struct nlattr *attr) 3004{ 3005 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { 3006 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, 3007 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC }, 3008 [OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 }, 3009 }; 3010 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; 3011 int error; 3012 3013 error = nla_parse_deprecated_strict(a, OVS_USERSPACE_ATTR_MAX, 3014 nla_data(attr), nla_len(attr), 3015 userspace_policy, NULL); 3016 if (error) 3017 return error; 3018 3019 if (!a[OVS_USERSPACE_ATTR_PID] || 3020 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) 3021 return -EINVAL; 3022 3023 return 0; 3024} 3025 3026static const struct nla_policy cpl_policy[OVS_CHECK_PKT_LEN_ATTR_MAX + 1] = { 3027 [OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] = {.type = NLA_U16 }, 3028 [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER] = {.type = NLA_NESTED }, 3029 [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL] = {.type = NLA_NESTED }, 3030}; 3031 3032static int validate_and_copy_check_pkt_len(struct net *net, 3033 const struct nlattr *attr, 3034 const struct sw_flow_key *key, 3035 struct sw_flow_actions **sfa, 3036 __be16 eth_type, __be16 vlan_tci, 3037 u32 mpls_label_count, 3038 bool log, bool last, u32 depth) 3039{ 3040 const struct nlattr *acts_if_greater, *acts_if_lesser_eq; 3041 struct nlattr *a[OVS_CHECK_PKT_LEN_ATTR_MAX + 1]; 3042 struct check_pkt_len_arg arg; 3043 int nested_acts_start; 3044 int start, err; 3045 3046 err = nla_parse_deprecated_strict(a, OVS_CHECK_PKT_LEN_ATTR_MAX, 3047 nla_data(attr), nla_len(attr), 3048 cpl_policy, NULL); 3049 if (err) 3050 return err; 3051 3052 if (!a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] || 3053 !nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN])) 3054 return -EINVAL; 3055 3056 acts_if_lesser_eq = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL]; 3057 acts_if_greater = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER]; 3058 3059 /* Both the nested action should be present. */ 3060 if (!acts_if_greater || !acts_if_lesser_eq) 3061 return -EINVAL; 3062 3063 /* validation done, copy the nested actions. */ 3064 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CHECK_PKT_LEN, 3065 log); 3066 if (start < 0) 3067 return start; 3068 3069 arg.pkt_len = nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN]); 3070 arg.exec_for_lesser_equal = 3071 last || !actions_may_change_flow(acts_if_lesser_eq); 3072 arg.exec_for_greater = 3073 last || !actions_may_change_flow(acts_if_greater); 3074 3075 err = ovs_nla_add_action(sfa, OVS_CHECK_PKT_LEN_ATTR_ARG, &arg, 3076 sizeof(arg), log); 3077 if (err) 3078 return err; 3079 3080 nested_acts_start = add_nested_action_start(sfa, 3081 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL, log); 3082 if (nested_acts_start < 0) 3083 return nested_acts_start; 3084 3085 err = __ovs_nla_copy_actions(net, acts_if_lesser_eq, key, sfa, 3086 eth_type, vlan_tci, mpls_label_count, log, 3087 depth + 1); 3088 3089 if (err) 3090 return err; 3091 3092 add_nested_action_end(*sfa, nested_acts_start); 3093 3094 nested_acts_start = add_nested_action_start(sfa, 3095 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER, log); 3096 if (nested_acts_start < 0) 3097 return nested_acts_start; 3098 3099 err = __ovs_nla_copy_actions(net, acts_if_greater, key, sfa, 3100 eth_type, vlan_tci, mpls_label_count, log, 3101 depth + 1); 3102 3103 if (err) 3104 return err; 3105 3106 add_nested_action_end(*sfa, nested_acts_start); 3107 add_nested_action_end(*sfa, start); 3108 return 0; 3109} 3110 3111static int validate_psample(const struct nlattr *attr) 3112{ 3113 static const struct nla_policy policy[OVS_PSAMPLE_ATTR_MAX + 1] = { 3114 [OVS_PSAMPLE_ATTR_GROUP] = { .type = NLA_U32 }, 3115 [OVS_PSAMPLE_ATTR_COOKIE] = { 3116 .type = NLA_BINARY, 3117 .len = OVS_PSAMPLE_COOKIE_MAX_SIZE, 3118 }, 3119 }; 3120 struct nlattr *a[OVS_PSAMPLE_ATTR_MAX + 1]; 3121 int err; 3122 3123 if (!IS_ENABLED(CONFIG_PSAMPLE)) 3124 return -EOPNOTSUPP; 3125 3126 err = nla_parse_nested(a, OVS_PSAMPLE_ATTR_MAX, attr, policy, NULL); 3127 if (err) 3128 return err; 3129 3130 return a[OVS_PSAMPLE_ATTR_GROUP] ? 0 : -EINVAL; 3131} 3132 3133static int copy_action(const struct nlattr *from, 3134 struct sw_flow_actions **sfa, bool log) 3135{ 3136 int totlen = NLA_ALIGN(from->nla_len); 3137 struct nlattr *to; 3138 3139 to = reserve_sfa_size(sfa, from->nla_len, log); 3140 if (IS_ERR(to)) 3141 return PTR_ERR(to); 3142 3143 memcpy(to, from, totlen); 3144 return 0; 3145} 3146 3147static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, 3148 const struct sw_flow_key *key, 3149 struct sw_flow_actions **sfa, 3150 __be16 eth_type, __be16 vlan_tci, 3151 u32 mpls_label_count, bool log, 3152 u32 depth) 3153{ 3154 u8 mac_proto = ovs_key_mac_proto(key); 3155 const struct nlattr *a; 3156 int rem, err; 3157 3158 if (depth > OVS_COPY_ACTIONS_MAX_DEPTH) 3159 return -EOVERFLOW; 3160 3161 nla_for_each_nested(a, attr, rem) { 3162 /* Expected argument lengths, (u32)-1 for variable length. */ 3163 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { 3164 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), 3165 [OVS_ACTION_ATTR_RECIRC] = sizeof(u32), 3166 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, 3167 [OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls), 3168 [OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16), 3169 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), 3170 [OVS_ACTION_ATTR_POP_VLAN] = 0, 3171 [OVS_ACTION_ATTR_SET] = (u32)-1, 3172 [OVS_ACTION_ATTR_SET_MASKED] = (u32)-1, 3173 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1, 3174 [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash), 3175 [OVS_ACTION_ATTR_CT] = (u32)-1, 3176 [OVS_ACTION_ATTR_CT_CLEAR] = 0, 3177 [OVS_ACTION_ATTR_TRUNC] = sizeof(struct ovs_action_trunc), 3178 [OVS_ACTION_ATTR_PUSH_ETH] = sizeof(struct ovs_action_push_eth), 3179 [OVS_ACTION_ATTR_POP_ETH] = 0, 3180 [OVS_ACTION_ATTR_PUSH_NSH] = (u32)-1, 3181 [OVS_ACTION_ATTR_POP_NSH] = 0, 3182 [OVS_ACTION_ATTR_METER] = sizeof(u32), 3183 [OVS_ACTION_ATTR_CLONE] = (u32)-1, 3184 [OVS_ACTION_ATTR_CHECK_PKT_LEN] = (u32)-1, 3185 [OVS_ACTION_ATTR_ADD_MPLS] = sizeof(struct ovs_action_add_mpls), 3186 [OVS_ACTION_ATTR_DEC_TTL] = (u32)-1, 3187 [OVS_ACTION_ATTR_DROP] = sizeof(u32), 3188 [OVS_ACTION_ATTR_PSAMPLE] = (u32)-1, 3189 }; 3190 const struct ovs_action_push_vlan *vlan; 3191 int type = nla_type(a); 3192 bool skip_copy; 3193 3194 if (type > OVS_ACTION_ATTR_MAX || 3195 (action_lens[type] != nla_len(a) && 3196 action_lens[type] != (u32)-1)) 3197 return -EINVAL; 3198 3199 skip_copy = false; 3200 switch (type) { 3201 case OVS_ACTION_ATTR_UNSPEC: 3202 return -EINVAL; 3203 3204 case OVS_ACTION_ATTR_USERSPACE: 3205 err = validate_userspace(a); 3206 if (err) 3207 return err; 3208 break; 3209 3210 case OVS_ACTION_ATTR_OUTPUT: 3211 if (nla_get_u32(a) >= DP_MAX_PORTS) 3212 return -EINVAL; 3213 break; 3214 3215 case OVS_ACTION_ATTR_TRUNC: { 3216 const struct ovs_action_trunc *trunc = nla_data(a); 3217 3218 if (trunc->max_len < ETH_HLEN) 3219 return -EINVAL; 3220 break; 3221 } 3222 3223 case OVS_ACTION_ATTR_HASH: { 3224 const struct ovs_action_hash *act_hash = nla_data(a); 3225 3226 switch (act_hash->hash_alg) { 3227 case OVS_HASH_ALG_L4: 3228 fallthrough; 3229 case OVS_HASH_ALG_SYM_L4: 3230 break; 3231 default: 3232 return -EINVAL; 3233 } 3234 3235 break; 3236 } 3237 3238 case OVS_ACTION_ATTR_POP_VLAN: 3239 if (mac_proto != MAC_PROTO_ETHERNET) 3240 return -EINVAL; 3241 vlan_tci = htons(0); 3242 break; 3243 3244 case OVS_ACTION_ATTR_PUSH_VLAN: 3245 if (mac_proto != MAC_PROTO_ETHERNET) 3246 return -EINVAL; 3247 vlan = nla_data(a); 3248 if (!eth_type_vlan(vlan->vlan_tpid)) 3249 return -EINVAL; 3250 if (!(vlan->vlan_tci & htons(VLAN_CFI_MASK))) 3251 return -EINVAL; 3252 vlan_tci = vlan->vlan_tci; 3253 break; 3254 3255 case OVS_ACTION_ATTR_RECIRC: 3256 break; 3257 3258 case OVS_ACTION_ATTR_ADD_MPLS: { 3259 const struct ovs_action_add_mpls *mpls = nla_data(a); 3260 3261 if (!eth_p_mpls(mpls->mpls_ethertype)) 3262 return -EINVAL; 3263 3264 if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK) { 3265 if (vlan_tci & htons(VLAN_CFI_MASK) || 3266 (eth_type != htons(ETH_P_IP) && 3267 eth_type != htons(ETH_P_IPV6) && 3268 eth_type != htons(ETH_P_ARP) && 3269 eth_type != htons(ETH_P_RARP) && 3270 !eth_p_mpls(eth_type))) 3271 return -EINVAL; 3272 mpls_label_count++; 3273 } else { 3274 if (mac_proto == MAC_PROTO_ETHERNET) { 3275 mpls_label_count = 1; 3276 mac_proto = MAC_PROTO_NONE; 3277 } else { 3278 mpls_label_count++; 3279 } 3280 } 3281 eth_type = mpls->mpls_ethertype; 3282 break; 3283 } 3284 3285 case OVS_ACTION_ATTR_PUSH_MPLS: { 3286 const struct ovs_action_push_mpls *mpls = nla_data(a); 3287 3288 if (!eth_p_mpls(mpls->mpls_ethertype)) 3289 return -EINVAL; 3290 /* Prohibit push MPLS other than to a white list 3291 * for packets that have a known tag order. 3292 */ 3293 if (vlan_tci & htons(VLAN_CFI_MASK) || 3294 (eth_type != htons(ETH_P_IP) && 3295 eth_type != htons(ETH_P_IPV6) && 3296 eth_type != htons(ETH_P_ARP) && 3297 eth_type != htons(ETH_P_RARP) && 3298 !eth_p_mpls(eth_type))) 3299 return -EINVAL; 3300 eth_type = mpls->mpls_ethertype; 3301 mpls_label_count++; 3302 break; 3303 } 3304 3305 case OVS_ACTION_ATTR_POP_MPLS: { 3306 __be16 proto; 3307 if (vlan_tci & htons(VLAN_CFI_MASK) || 3308 !eth_p_mpls(eth_type)) 3309 return -EINVAL; 3310 3311 /* Disallow subsequent L2.5+ set actions and mpls_pop 3312 * actions once the last MPLS label in the packet is 3313 * popped as there is no check here to ensure that 3314 * the new eth type is valid and thus set actions could 3315 * write off the end of the packet or otherwise corrupt 3316 * it. 3317 * 3318 * Support for these actions is planned using packet 3319 * recirculation. 3320 */ 3321 proto = nla_get_be16(a); 3322 3323 if (proto == htons(ETH_P_TEB) && 3324 mac_proto != MAC_PROTO_NONE) 3325 return -EINVAL; 3326 3327 mpls_label_count--; 3328 3329 if (!eth_p_mpls(proto) || !mpls_label_count) 3330 eth_type = htons(0); 3331 else 3332 eth_type = proto; 3333 3334 break; 3335 } 3336 3337 case OVS_ACTION_ATTR_SET: 3338 err = validate_set(a, key, sfa, 3339 &skip_copy, mac_proto, eth_type, 3340 false, log); 3341 if (err) 3342 return err; 3343 break; 3344 3345 case OVS_ACTION_ATTR_SET_MASKED: 3346 err = validate_set(a, key, sfa, 3347 &skip_copy, mac_proto, eth_type, 3348 true, log); 3349 if (err) 3350 return err; 3351 break; 3352 3353 case OVS_ACTION_ATTR_SAMPLE: { 3354 bool last = nla_is_last(a, rem); 3355 3356 err = validate_and_copy_sample(net, a, key, sfa, 3357 eth_type, vlan_tci, 3358 mpls_label_count, 3359 log, last, depth); 3360 if (err) 3361 return err; 3362 skip_copy = true; 3363 break; 3364 } 3365 3366 case OVS_ACTION_ATTR_CT: 3367 err = ovs_ct_copy_action(net, a, key, sfa, log); 3368 if (err) 3369 return err; 3370 skip_copy = true; 3371 break; 3372 3373 case OVS_ACTION_ATTR_CT_CLEAR: 3374 break; 3375 3376 case OVS_ACTION_ATTR_PUSH_ETH: 3377 /* Disallow pushing an Ethernet header if one 3378 * is already present */ 3379 if (mac_proto != MAC_PROTO_NONE) 3380 return -EINVAL; 3381 mac_proto = MAC_PROTO_ETHERNET; 3382 break; 3383 3384 case OVS_ACTION_ATTR_POP_ETH: 3385 if (mac_proto != MAC_PROTO_ETHERNET) 3386 return -EINVAL; 3387 if (vlan_tci & htons(VLAN_CFI_MASK)) 3388 return -EINVAL; 3389 mac_proto = MAC_PROTO_NONE; 3390 break; 3391 3392 case OVS_ACTION_ATTR_PUSH_NSH: 3393 if (mac_proto != MAC_PROTO_ETHERNET) { 3394 u8 next_proto; 3395 3396 next_proto = tun_p_from_eth_p(eth_type); 3397 if (!next_proto) 3398 return -EINVAL; 3399 } 3400 mac_proto = MAC_PROTO_NONE; 3401 if (!validate_push_nsh(a, log)) 3402 return -EINVAL; 3403 break; 3404 3405 case OVS_ACTION_ATTR_POP_NSH: { 3406 __be16 inner_proto; 3407 3408 if (eth_type != htons(ETH_P_NSH)) 3409 return -EINVAL; 3410 inner_proto = tun_p_to_eth_p(key->nsh.base.np); 3411 if (!inner_proto) 3412 return -EINVAL; 3413 if (key->nsh.base.np == TUN_P_ETHERNET) 3414 mac_proto = MAC_PROTO_ETHERNET; 3415 else 3416 mac_proto = MAC_PROTO_NONE; 3417 break; 3418 } 3419 3420 case OVS_ACTION_ATTR_METER: 3421 /* Non-existent meters are simply ignored. */ 3422 break; 3423 3424 case OVS_ACTION_ATTR_CLONE: { 3425 bool last = nla_is_last(a, rem); 3426 3427 err = validate_and_copy_clone(net, a, key, sfa, 3428 eth_type, vlan_tci, 3429 mpls_label_count, 3430 log, last, depth); 3431 if (err) 3432 return err; 3433 skip_copy = true; 3434 break; 3435 } 3436 3437 case OVS_ACTION_ATTR_CHECK_PKT_LEN: { 3438 bool last = nla_is_last(a, rem); 3439 3440 err = validate_and_copy_check_pkt_len(net, a, key, sfa, 3441 eth_type, 3442 vlan_tci, 3443 mpls_label_count, 3444 log, last, 3445 depth); 3446 if (err) 3447 return err; 3448 skip_copy = true; 3449 break; 3450 } 3451 3452 case OVS_ACTION_ATTR_DEC_TTL: 3453 err = validate_and_copy_dec_ttl(net, a, key, sfa, 3454 eth_type, vlan_tci, 3455 mpls_label_count, log, 3456 depth); 3457 if (err) 3458 return err; 3459 skip_copy = true; 3460 break; 3461 3462 case OVS_ACTION_ATTR_DROP: 3463 if (!nla_is_last(a, rem)) 3464 return -EINVAL; 3465 break; 3466 3467 case OVS_ACTION_ATTR_PSAMPLE: 3468 err = validate_psample(a); 3469 if (err) 3470 return err; 3471 break; 3472 3473 default: 3474 OVS_NLERR(log, "Unknown Action type %d", type); 3475 return -EINVAL; 3476 } 3477 if (!skip_copy) { 3478 err = copy_action(a, sfa, log); 3479 if (err) 3480 return err; 3481 } 3482 } 3483 3484 if (rem > 0) 3485 return -EINVAL; 3486 3487 return 0; 3488} 3489 3490/* 'key' must be the masked key. */ 3491int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, 3492 const struct sw_flow_key *key, 3493 struct sw_flow_actions **sfa, bool log) 3494{ 3495 int err; 3496 u32 mpls_label_count = 0; 3497 3498 *sfa = nla_alloc_flow_actions(nla_len(attr)); 3499 if (IS_ERR(*sfa)) 3500 return PTR_ERR(*sfa); 3501 3502 if (eth_p_mpls(key->eth.type)) 3503 mpls_label_count = hweight_long(key->mpls.num_labels_mask); 3504 3505 (*sfa)->orig_len = nla_len(attr); 3506 err = __ovs_nla_copy_actions(net, attr, key, sfa, key->eth.type, 3507 key->eth.vlan.tci, mpls_label_count, log, 3508 0); 3509 if (err) 3510 ovs_nla_free_flow_actions(*sfa); 3511 3512 return err; 3513} 3514 3515static int sample_action_to_attr(const struct nlattr *attr, 3516 struct sk_buff *skb) 3517{ 3518 struct nlattr *start, *ac_start = NULL, *sample_arg; 3519 int err = 0, rem = nla_len(attr); 3520 const struct sample_arg *arg; 3521 struct nlattr *actions; 3522 3523 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SAMPLE); 3524 if (!start) 3525 return -EMSGSIZE; 3526 3527 sample_arg = nla_data(attr); 3528 arg = nla_data(sample_arg); 3529 actions = nla_next(sample_arg, &rem); 3530 3531 if (nla_put_u32(skb, OVS_SAMPLE_ATTR_PROBABILITY, arg->probability)) { 3532 err = -EMSGSIZE; 3533 goto out; 3534 } 3535 3536 ac_start = nla_nest_start_noflag(skb, OVS_SAMPLE_ATTR_ACTIONS); 3537 if (!ac_start) { 3538 err = -EMSGSIZE; 3539 goto out; 3540 } 3541 3542 err = ovs_nla_put_actions(actions, rem, skb); 3543 3544out: 3545 if (err) { 3546 nla_nest_cancel(skb, ac_start); 3547 nla_nest_cancel(skb, start); 3548 } else { 3549 nla_nest_end(skb, ac_start); 3550 nla_nest_end(skb, start); 3551 } 3552 3553 return err; 3554} 3555 3556static int clone_action_to_attr(const struct nlattr *attr, 3557 struct sk_buff *skb) 3558{ 3559 struct nlattr *start; 3560 int err = 0, rem = nla_len(attr); 3561 3562 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CLONE); 3563 if (!start) 3564 return -EMSGSIZE; 3565 3566 /* Skipping the OVS_CLONE_ATTR_EXEC that is always the first attribute. */ 3567 attr = nla_next(nla_data(attr), &rem); 3568 err = ovs_nla_put_actions(attr, rem, skb); 3569 3570 if (err) 3571 nla_nest_cancel(skb, start); 3572 else 3573 nla_nest_end(skb, start); 3574 3575 return err; 3576} 3577 3578static int check_pkt_len_action_to_attr(const struct nlattr *attr, 3579 struct sk_buff *skb) 3580{ 3581 struct nlattr *start, *ac_start = NULL; 3582 const struct check_pkt_len_arg *arg; 3583 const struct nlattr *a, *cpl_arg; 3584 int err = 0, rem = nla_len(attr); 3585 3586 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CHECK_PKT_LEN); 3587 if (!start) 3588 return -EMSGSIZE; 3589 3590 /* The first nested attribute in 'attr' is always 3591 * 'OVS_CHECK_PKT_LEN_ATTR_ARG'. 3592 */ 3593 cpl_arg = nla_data(attr); 3594 arg = nla_data(cpl_arg); 3595 3596 if (nla_put_u16(skb, OVS_CHECK_PKT_LEN_ATTR_PKT_LEN, arg->pkt_len)) { 3597 err = -EMSGSIZE; 3598 goto out; 3599 } 3600 3601 /* Second nested attribute in 'attr' is always 3602 * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'. 3603 */ 3604 a = nla_next(cpl_arg, &rem); 3605 ac_start = nla_nest_start_noflag(skb, 3606 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL); 3607 if (!ac_start) { 3608 err = -EMSGSIZE; 3609 goto out; 3610 } 3611 3612 err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb); 3613 if (err) { 3614 nla_nest_cancel(skb, ac_start); 3615 goto out; 3616 } else { 3617 nla_nest_end(skb, ac_start); 3618 } 3619 3620 /* Third nested attribute in 'attr' is always 3621 * OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER. 3622 */ 3623 a = nla_next(a, &rem); 3624 ac_start = nla_nest_start_noflag(skb, 3625 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER); 3626 if (!ac_start) { 3627 err = -EMSGSIZE; 3628 goto out; 3629 } 3630 3631 err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb); 3632 if (err) { 3633 nla_nest_cancel(skb, ac_start); 3634 goto out; 3635 } else { 3636 nla_nest_end(skb, ac_start); 3637 } 3638 3639 nla_nest_end(skb, start); 3640 return 0; 3641 3642out: 3643 nla_nest_cancel(skb, start); 3644 return err; 3645} 3646 3647static int dec_ttl_action_to_attr(const struct nlattr *attr, 3648 struct sk_buff *skb) 3649{ 3650 struct nlattr *start, *action_start; 3651 const struct nlattr *a; 3652 int err = 0, rem; 3653 3654 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_DEC_TTL); 3655 if (!start) 3656 return -EMSGSIZE; 3657 3658 nla_for_each_attr(a, nla_data(attr), nla_len(attr), rem) { 3659 switch (nla_type(a)) { 3660 case OVS_DEC_TTL_ATTR_ACTION: 3661 3662 action_start = nla_nest_start_noflag(skb, OVS_DEC_TTL_ATTR_ACTION); 3663 if (!action_start) { 3664 err = -EMSGSIZE; 3665 goto out; 3666 } 3667 3668 err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb); 3669 if (err) 3670 goto out; 3671 3672 nla_nest_end(skb, action_start); 3673 break; 3674 3675 default: 3676 /* Ignore all other option to be future compatible */ 3677 break; 3678 } 3679 } 3680 3681 nla_nest_end(skb, start); 3682 return 0; 3683 3684out: 3685 nla_nest_cancel(skb, start); 3686 return err; 3687} 3688 3689static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb) 3690{ 3691 const struct nlattr *ovs_key = nla_data(a); 3692 int key_type = nla_type(ovs_key); 3693 struct nlattr *start; 3694 int err; 3695 3696 switch (key_type) { 3697 case OVS_KEY_ATTR_TUNNEL_INFO: { 3698 struct ovs_tunnel_info *ovs_tun = nla_data(ovs_key); 3699 struct ip_tunnel_info *tun_info = &ovs_tun->tun_dst->u.tun_info; 3700 3701 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SET); 3702 if (!start) 3703 return -EMSGSIZE; 3704 3705 err = ip_tun_to_nlattr(skb, &tun_info->key, 3706 ip_tunnel_info_opts(tun_info), 3707 tun_info->options_len, 3708 ip_tunnel_info_af(tun_info), tun_info->mode); 3709 if (err) 3710 return err; 3711 nla_nest_end(skb, start); 3712 break; 3713 } 3714 default: 3715 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key)) 3716 return -EMSGSIZE; 3717 break; 3718 } 3719 3720 return 0; 3721} 3722 3723static int masked_set_action_to_set_action_attr(const struct nlattr *a, 3724 struct sk_buff *skb) 3725{ 3726 const struct nlattr *ovs_key = nla_data(a); 3727 struct nlattr *nla; 3728 size_t key_len = nla_len(ovs_key) / 2; 3729 3730 /* Revert the conversion we did from a non-masked set action to 3731 * masked set action. 3732 */ 3733 nla = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SET); 3734 if (!nla) 3735 return -EMSGSIZE; 3736 3737 if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key))) 3738 return -EMSGSIZE; 3739 3740 nla_nest_end(skb, nla); 3741 return 0; 3742} 3743 3744int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb) 3745{ 3746 const struct nlattr *a; 3747 int rem, err; 3748 3749 nla_for_each_attr(a, attr, len, rem) { 3750 int type = nla_type(a); 3751 3752 switch (type) { 3753 case OVS_ACTION_ATTR_SET: 3754 err = set_action_to_attr(a, skb); 3755 if (err) 3756 return err; 3757 break; 3758 3759 case OVS_ACTION_ATTR_SET_TO_MASKED: 3760 err = masked_set_action_to_set_action_attr(a, skb); 3761 if (err) 3762 return err; 3763 break; 3764 3765 case OVS_ACTION_ATTR_SAMPLE: 3766 err = sample_action_to_attr(a, skb); 3767 if (err) 3768 return err; 3769 break; 3770 3771 case OVS_ACTION_ATTR_CT: 3772 err = ovs_ct_action_to_attr(nla_data(a), skb); 3773 if (err) 3774 return err; 3775 break; 3776 3777 case OVS_ACTION_ATTR_CLONE: 3778 err = clone_action_to_attr(a, skb); 3779 if (err) 3780 return err; 3781 break; 3782 3783 case OVS_ACTION_ATTR_CHECK_PKT_LEN: 3784 err = check_pkt_len_action_to_attr(a, skb); 3785 if (err) 3786 return err; 3787 break; 3788 3789 case OVS_ACTION_ATTR_DEC_TTL: 3790 err = dec_ttl_action_to_attr(a, skb); 3791 if (err) 3792 return err; 3793 break; 3794 3795 default: 3796 if (nla_put(skb, type, nla_len(a), nla_data(a))) 3797 return -EMSGSIZE; 3798 break; 3799 } 3800 } 3801 3802 return 0; 3803}
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