1 /* 2 * net/sched/cls_flower.c Flower classifier 3 * 4 * Copyright (c) 2015 Jiri Pirko <jiri@resnulli.us> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/rhashtable.h> 16 #include <linux/workqueue.h> 17 18 #include <linux/if_ether.h> 19 #include <linux/in6.h> 20 #include <linux/ip.h> 21 #include <linux/mpls.h> 22 23 #include <net/sch_generic.h> 24 #include <net/pkt_cls.h> 25 #include <net/ip.h> 26 #include <net/flow_dissector.h> 27 28 #include <net/dst.h> 29 #include <net/dst_metadata.h> 30 31 struct fl_flow_key { 32 int indev_ifindex; 33 struct flow_dissector_key_control control; 34 struct flow_dissector_key_control enc_control; 35 struct flow_dissector_key_basic basic; 36 struct flow_dissector_key_eth_addrs eth; 37 struct flow_dissector_key_vlan vlan; 38 union { 39 struct flow_dissector_key_ipv4_addrs ipv4; 40 struct flow_dissector_key_ipv6_addrs ipv6; 41 }; 42 struct flow_dissector_key_ports tp; 43 struct flow_dissector_key_icmp icmp; 44 struct flow_dissector_key_arp arp; 45 struct flow_dissector_key_keyid enc_key_id; 46 union { 47 struct flow_dissector_key_ipv4_addrs enc_ipv4; 48 struct flow_dissector_key_ipv6_addrs enc_ipv6; 49 }; 50 struct flow_dissector_key_ports enc_tp; 51 struct flow_dissector_key_mpls mpls; 52 struct flow_dissector_key_tcp tcp; 53 struct flow_dissector_key_ip ip; 54 } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */ 55 56 struct fl_flow_mask_range { 57 unsigned short int start; 58 unsigned short int end; 59 }; 60 61 struct fl_flow_mask { 62 struct fl_flow_key key; 63 struct fl_flow_mask_range range; 64 struct rcu_head rcu; 65 }; 66 67 struct cls_fl_head { 68 struct rhashtable ht; 69 struct fl_flow_mask mask; 70 struct flow_dissector dissector; 71 bool mask_assigned; 72 struct list_head filters; 73 struct rhashtable_params ht_params; 74 union { 75 struct work_struct work; 76 struct rcu_head rcu; 77 }; 78 struct idr handle_idr; 79 }; 80 81 struct cls_fl_filter { 82 struct rhash_head ht_node; 83 struct fl_flow_key mkey; 84 struct tcf_exts exts; 85 struct tcf_result res; 86 struct fl_flow_key key; 87 struct list_head list; 88 u32 handle; 89 u32 flags; 90 union { 91 struct work_struct work; 92 struct rcu_head rcu; 93 }; 94 struct net_device *hw_dev; 95 }; 96 97 static unsigned short int fl_mask_range(const struct fl_flow_mask *mask) 98 { 99 return mask->range.end - mask->range.start; 100 } 101 102 static void fl_mask_update_range(struct fl_flow_mask *mask) 103 { 104 const u8 *bytes = (const u8 *) &mask->key; 105 size_t size = sizeof(mask->key); 106 size_t i, first = 0, last = size - 1; 107 108 for (i = 0; i < sizeof(mask->key); i++) { 109 if (bytes[i]) { 110 if (!first && i) 111 first = i; 112 last = i; 113 } 114 } 115 mask->range.start = rounddown(first, sizeof(long)); 116 mask->range.end = roundup(last + 1, sizeof(long)); 117 } 118 119 static void *fl_key_get_start(struct fl_flow_key *key, 120 const struct fl_flow_mask *mask) 121 { 122 return (u8 *) key + mask->range.start; 123 } 124 125 static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key, 126 struct fl_flow_mask *mask) 127 { 128 const long *lkey = fl_key_get_start(key, mask); 129 const long *lmask = fl_key_get_start(&mask->key, mask); 130 long *lmkey = fl_key_get_start(mkey, mask); 131 int i; 132 133 for (i = 0; i < fl_mask_range(mask); i += sizeof(long)) 134 *lmkey++ = *lkey++ & *lmask++; 135 } 136 137 static void fl_clear_masked_range(struct fl_flow_key *key, 138 struct fl_flow_mask *mask) 139 { 140 memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask)); 141 } 142 143 static struct cls_fl_filter *fl_lookup(struct cls_fl_head *head, 144 struct fl_flow_key *mkey) 145 { 146 return rhashtable_lookup_fast(&head->ht, 147 fl_key_get_start(mkey, &head->mask), 148 head->ht_params); 149 } 150 151 static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp, 152 struct tcf_result *res) 153 { 154 struct cls_fl_head *head = rcu_dereference_bh(tp->root); 155 struct cls_fl_filter *f; 156 struct fl_flow_key skb_key; 157 struct fl_flow_key skb_mkey; 158 struct ip_tunnel_info *info; 159 160 if (!atomic_read(&head->ht.nelems)) 161 return -1; 162 163 fl_clear_masked_range(&skb_key, &head->mask); 164 165 info = skb_tunnel_info(skb); 166 if (info) { 167 struct ip_tunnel_key *key = &info->key; 168 169 switch (ip_tunnel_info_af(info)) { 170 case AF_INET: 171 skb_key.enc_control.addr_type = 172 FLOW_DISSECTOR_KEY_IPV4_ADDRS; 173 skb_key.enc_ipv4.src = key->u.ipv4.src; 174 skb_key.enc_ipv4.dst = key->u.ipv4.dst; 175 break; 176 case AF_INET6: 177 skb_key.enc_control.addr_type = 178 FLOW_DISSECTOR_KEY_IPV6_ADDRS; 179 skb_key.enc_ipv6.src = key->u.ipv6.src; 180 skb_key.enc_ipv6.dst = key->u.ipv6.dst; 181 break; 182 } 183 184 skb_key.enc_key_id.keyid = tunnel_id_to_key32(key->tun_id); 185 skb_key.enc_tp.src = key->tp_src; 186 skb_key.enc_tp.dst = key->tp_dst; 187 } 188 189 skb_key.indev_ifindex = skb->skb_iif; 190 /* skb_flow_dissect() does not set n_proto in case an unknown protocol, 191 * so do it rather here. 192 */ 193 skb_key.basic.n_proto = skb->protocol; 194 skb_flow_dissect(skb, &head->dissector, &skb_key, 0); 195 196 fl_set_masked_key(&skb_mkey, &skb_key, &head->mask); 197 198 f = fl_lookup(head, &skb_mkey); 199 if (f && !tc_skip_sw(f->flags)) { 200 *res = f->res; 201 return tcf_exts_exec(skb, &f->exts, res); 202 } 203 return -1; 204 } 205 206 static int fl_init(struct tcf_proto *tp) 207 { 208 struct cls_fl_head *head; 209 210 head = kzalloc(sizeof(*head), GFP_KERNEL); 211 if (!head) 212 return -ENOBUFS; 213 214 INIT_LIST_HEAD_RCU(&head->filters); 215 rcu_assign_pointer(tp->root, head); 216 idr_init(&head->handle_idr); 217 218 return 0; 219 } 220 221 static void fl_destroy_filter_work(struct work_struct *work) 222 { 223 struct cls_fl_filter *f = container_of(work, struct cls_fl_filter, work); 224 225 rtnl_lock(); 226 tcf_exts_destroy(&f->exts); 227 kfree(f); 228 rtnl_unlock(); 229 } 230 231 static void fl_destroy_filter(struct rcu_head *head) 232 { 233 struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu); 234 235 INIT_WORK(&f->work, fl_destroy_filter_work); 236 tcf_queue_work(&f->work); 237 } 238 239 static void fl_hw_destroy_filter(struct tcf_proto *tp, struct cls_fl_filter *f) 240 { 241 struct tc_cls_flower_offload cls_flower = {}; 242 struct net_device *dev = f->hw_dev; 243 244 if (!tc_can_offload(dev)) 245 return; 246 247 tc_cls_common_offload_init(&cls_flower.common, tp); 248 cls_flower.command = TC_CLSFLOWER_DESTROY; 249 cls_flower.cookie = (unsigned long) f; 250 cls_flower.egress_dev = f->hw_dev != tp->q->dev_queue->dev; 251 252 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSFLOWER, &cls_flower); 253 } 254 255 static int fl_hw_replace_filter(struct tcf_proto *tp, 256 struct flow_dissector *dissector, 257 struct fl_flow_key *mask, 258 struct cls_fl_filter *f) 259 { 260 struct net_device *dev = tp->q->dev_queue->dev; 261 struct tc_cls_flower_offload cls_flower = {}; 262 int err; 263 264 if (!tc_can_offload(dev)) { 265 if (tcf_exts_get_dev(dev, &f->exts, &f->hw_dev) || 266 (f->hw_dev && !tc_can_offload(f->hw_dev))) { 267 f->hw_dev = dev; 268 return tc_skip_sw(f->flags) ? -EINVAL : 0; 269 } 270 dev = f->hw_dev; 271 cls_flower.egress_dev = true; 272 } else { 273 f->hw_dev = dev; 274 } 275 276 tc_cls_common_offload_init(&cls_flower.common, tp); 277 cls_flower.command = TC_CLSFLOWER_REPLACE; 278 cls_flower.cookie = (unsigned long) f; 279 cls_flower.dissector = dissector; 280 cls_flower.mask = mask; 281 cls_flower.key = &f->mkey; 282 cls_flower.exts = &f->exts; 283 284 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSFLOWER, 285 &cls_flower); 286 if (!err) 287 f->flags |= TCA_CLS_FLAGS_IN_HW; 288 289 if (tc_skip_sw(f->flags)) 290 return err; 291 return 0; 292 } 293 294 static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f) 295 { 296 struct tc_cls_flower_offload cls_flower = {}; 297 struct net_device *dev = f->hw_dev; 298 299 if (!tc_can_offload(dev)) 300 return; 301 302 tc_cls_common_offload_init(&cls_flower.common, tp); 303 cls_flower.command = TC_CLSFLOWER_STATS; 304 cls_flower.cookie = (unsigned long) f; 305 cls_flower.exts = &f->exts; 306 cls_flower.egress_dev = f->hw_dev != tp->q->dev_queue->dev; 307 308 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSFLOWER, 309 &cls_flower); 310 } 311 312 static void __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f) 313 { 314 struct cls_fl_head *head = rtnl_dereference(tp->root); 315 316 idr_remove_ext(&head->handle_idr, f->handle); 317 list_del_rcu(&f->list); 318 if (!tc_skip_hw(f->flags)) 319 fl_hw_destroy_filter(tp, f); 320 tcf_unbind_filter(tp, &f->res); 321 call_rcu(&f->rcu, fl_destroy_filter); 322 } 323 324 static void fl_destroy_sleepable(struct work_struct *work) 325 { 326 struct cls_fl_head *head = container_of(work, struct cls_fl_head, 327 work); 328 if (head->mask_assigned) 329 rhashtable_destroy(&head->ht); 330 kfree(head); 331 module_put(THIS_MODULE); 332 } 333 334 static void fl_destroy_rcu(struct rcu_head *rcu) 335 { 336 struct cls_fl_head *head = container_of(rcu, struct cls_fl_head, rcu); 337 338 INIT_WORK(&head->work, fl_destroy_sleepable); 339 schedule_work(&head->work); 340 } 341 342 static void fl_destroy(struct tcf_proto *tp) 343 { 344 struct cls_fl_head *head = rtnl_dereference(tp->root); 345 struct cls_fl_filter *f, *next; 346 347 list_for_each_entry_safe(f, next, &head->filters, list) 348 __fl_delete(tp, f); 349 idr_destroy(&head->handle_idr); 350 351 __module_get(THIS_MODULE); 352 call_rcu(&head->rcu, fl_destroy_rcu); 353 } 354 355 static void *fl_get(struct tcf_proto *tp, u32 handle) 356 { 357 struct cls_fl_head *head = rtnl_dereference(tp->root); 358 359 return idr_find_ext(&head->handle_idr, handle); 360 } 361 362 static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = { 363 [TCA_FLOWER_UNSPEC] = { .type = NLA_UNSPEC }, 364 [TCA_FLOWER_CLASSID] = { .type = NLA_U32 }, 365 [TCA_FLOWER_INDEV] = { .type = NLA_STRING, 366 .len = IFNAMSIZ }, 367 [TCA_FLOWER_KEY_ETH_DST] = { .len = ETH_ALEN }, 368 [TCA_FLOWER_KEY_ETH_DST_MASK] = { .len = ETH_ALEN }, 369 [TCA_FLOWER_KEY_ETH_SRC] = { .len = ETH_ALEN }, 370 [TCA_FLOWER_KEY_ETH_SRC_MASK] = { .len = ETH_ALEN }, 371 [TCA_FLOWER_KEY_ETH_TYPE] = { .type = NLA_U16 }, 372 [TCA_FLOWER_KEY_IP_PROTO] = { .type = NLA_U8 }, 373 [TCA_FLOWER_KEY_IPV4_SRC] = { .type = NLA_U32 }, 374 [TCA_FLOWER_KEY_IPV4_SRC_MASK] = { .type = NLA_U32 }, 375 [TCA_FLOWER_KEY_IPV4_DST] = { .type = NLA_U32 }, 376 [TCA_FLOWER_KEY_IPV4_DST_MASK] = { .type = NLA_U32 }, 377 [TCA_FLOWER_KEY_IPV6_SRC] = { .len = sizeof(struct in6_addr) }, 378 [TCA_FLOWER_KEY_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) }, 379 [TCA_FLOWER_KEY_IPV6_DST] = { .len = sizeof(struct in6_addr) }, 380 [TCA_FLOWER_KEY_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) }, 381 [TCA_FLOWER_KEY_TCP_SRC] = { .type = NLA_U16 }, 382 [TCA_FLOWER_KEY_TCP_DST] = { .type = NLA_U16 }, 383 [TCA_FLOWER_KEY_UDP_SRC] = { .type = NLA_U16 }, 384 [TCA_FLOWER_KEY_UDP_DST] = { .type = NLA_U16 }, 385 [TCA_FLOWER_KEY_VLAN_ID] = { .type = NLA_U16 }, 386 [TCA_FLOWER_KEY_VLAN_PRIO] = { .type = NLA_U8 }, 387 [TCA_FLOWER_KEY_VLAN_ETH_TYPE] = { .type = NLA_U16 }, 388 [TCA_FLOWER_KEY_ENC_KEY_ID] = { .type = NLA_U32 }, 389 [TCA_FLOWER_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 }, 390 [TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK] = { .type = NLA_U32 }, 391 [TCA_FLOWER_KEY_ENC_IPV4_DST] = { .type = NLA_U32 }, 392 [TCA_FLOWER_KEY_ENC_IPV4_DST_MASK] = { .type = NLA_U32 }, 393 [TCA_FLOWER_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) }, 394 [TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) }, 395 [TCA_FLOWER_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) }, 396 [TCA_FLOWER_KEY_ENC_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) }, 397 [TCA_FLOWER_KEY_TCP_SRC_MASK] = { .type = NLA_U16 }, 398 [TCA_FLOWER_KEY_TCP_DST_MASK] = { .type = NLA_U16 }, 399 [TCA_FLOWER_KEY_UDP_SRC_MASK] = { .type = NLA_U16 }, 400 [TCA_FLOWER_KEY_UDP_DST_MASK] = { .type = NLA_U16 }, 401 [TCA_FLOWER_KEY_SCTP_SRC_MASK] = { .type = NLA_U16 }, 402 [TCA_FLOWER_KEY_SCTP_DST_MASK] = { .type = NLA_U16 }, 403 [TCA_FLOWER_KEY_SCTP_SRC] = { .type = NLA_U16 }, 404 [TCA_FLOWER_KEY_SCTP_DST] = { .type = NLA_U16 }, 405 [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT] = { .type = NLA_U16 }, 406 [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK] = { .type = NLA_U16 }, 407 [TCA_FLOWER_KEY_ENC_UDP_DST_PORT] = { .type = NLA_U16 }, 408 [TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK] = { .type = NLA_U16 }, 409 [TCA_FLOWER_KEY_FLAGS] = { .type = NLA_U32 }, 410 [TCA_FLOWER_KEY_FLAGS_MASK] = { .type = NLA_U32 }, 411 [TCA_FLOWER_KEY_ICMPV4_TYPE] = { .type = NLA_U8 }, 412 [TCA_FLOWER_KEY_ICMPV4_TYPE_MASK] = { .type = NLA_U8 }, 413 [TCA_FLOWER_KEY_ICMPV4_CODE] = { .type = NLA_U8 }, 414 [TCA_FLOWER_KEY_ICMPV4_CODE_MASK] = { .type = NLA_U8 }, 415 [TCA_FLOWER_KEY_ICMPV6_TYPE] = { .type = NLA_U8 }, 416 [TCA_FLOWER_KEY_ICMPV6_TYPE_MASK] = { .type = NLA_U8 }, 417 [TCA_FLOWER_KEY_ICMPV6_CODE] = { .type = NLA_U8 }, 418 [TCA_FLOWER_KEY_ICMPV6_CODE_MASK] = { .type = NLA_U8 }, 419 [TCA_FLOWER_KEY_ARP_SIP] = { .type = NLA_U32 }, 420 [TCA_FLOWER_KEY_ARP_SIP_MASK] = { .type = NLA_U32 }, 421 [TCA_FLOWER_KEY_ARP_TIP] = { .type = NLA_U32 }, 422 [TCA_FLOWER_KEY_ARP_TIP_MASK] = { .type = NLA_U32 }, 423 [TCA_FLOWER_KEY_ARP_OP] = { .type = NLA_U8 }, 424 [TCA_FLOWER_KEY_ARP_OP_MASK] = { .type = NLA_U8 }, 425 [TCA_FLOWER_KEY_ARP_SHA] = { .len = ETH_ALEN }, 426 [TCA_FLOWER_KEY_ARP_SHA_MASK] = { .len = ETH_ALEN }, 427 [TCA_FLOWER_KEY_ARP_THA] = { .len = ETH_ALEN }, 428 [TCA_FLOWER_KEY_ARP_THA_MASK] = { .len = ETH_ALEN }, 429 [TCA_FLOWER_KEY_MPLS_TTL] = { .type = NLA_U8 }, 430 [TCA_FLOWER_KEY_MPLS_BOS] = { .type = NLA_U8 }, 431 [TCA_FLOWER_KEY_MPLS_TC] = { .type = NLA_U8 }, 432 [TCA_FLOWER_KEY_MPLS_LABEL] = { .type = NLA_U32 }, 433 [TCA_FLOWER_KEY_TCP_FLAGS] = { .type = NLA_U16 }, 434 [TCA_FLOWER_KEY_TCP_FLAGS_MASK] = { .type = NLA_U16 }, 435 [TCA_FLOWER_KEY_IP_TOS] = { .type = NLA_U8 }, 436 [TCA_FLOWER_KEY_IP_TOS_MASK] = { .type = NLA_U8 }, 437 [TCA_FLOWER_KEY_IP_TTL] = { .type = NLA_U8 }, 438 [TCA_FLOWER_KEY_IP_TTL_MASK] = { .type = NLA_U8 }, 439 }; 440 441 static void fl_set_key_val(struct nlattr **tb, 442 void *val, int val_type, 443 void *mask, int mask_type, int len) 444 { 445 if (!tb[val_type]) 446 return; 447 memcpy(val, nla_data(tb[val_type]), len); 448 if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type]) 449 memset(mask, 0xff, len); 450 else 451 memcpy(mask, nla_data(tb[mask_type]), len); 452 } 453 454 static int fl_set_key_mpls(struct nlattr **tb, 455 struct flow_dissector_key_mpls *key_val, 456 struct flow_dissector_key_mpls *key_mask) 457 { 458 if (tb[TCA_FLOWER_KEY_MPLS_TTL]) { 459 key_val->mpls_ttl = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TTL]); 460 key_mask->mpls_ttl = MPLS_TTL_MASK; 461 } 462 if (tb[TCA_FLOWER_KEY_MPLS_BOS]) { 463 u8 bos = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_BOS]); 464 465 if (bos & ~MPLS_BOS_MASK) 466 return -EINVAL; 467 key_val->mpls_bos = bos; 468 key_mask->mpls_bos = MPLS_BOS_MASK; 469 } 470 if (tb[TCA_FLOWER_KEY_MPLS_TC]) { 471 u8 tc = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TC]); 472 473 if (tc & ~MPLS_TC_MASK) 474 return -EINVAL; 475 key_val->mpls_tc = tc; 476 key_mask->mpls_tc = MPLS_TC_MASK; 477 } 478 if (tb[TCA_FLOWER_KEY_MPLS_LABEL]) { 479 u32 label = nla_get_u32(tb[TCA_FLOWER_KEY_MPLS_LABEL]); 480 481 if (label & ~MPLS_LABEL_MASK) 482 return -EINVAL; 483 key_val->mpls_label = label; 484 key_mask->mpls_label = MPLS_LABEL_MASK; 485 } 486 return 0; 487 } 488 489 static void fl_set_key_vlan(struct nlattr **tb, 490 struct flow_dissector_key_vlan *key_val, 491 struct flow_dissector_key_vlan *key_mask) 492 { 493 #define VLAN_PRIORITY_MASK 0x7 494 495 if (tb[TCA_FLOWER_KEY_VLAN_ID]) { 496 key_val->vlan_id = 497 nla_get_u16(tb[TCA_FLOWER_KEY_VLAN_ID]) & VLAN_VID_MASK; 498 key_mask->vlan_id = VLAN_VID_MASK; 499 } 500 if (tb[TCA_FLOWER_KEY_VLAN_PRIO]) { 501 key_val->vlan_priority = 502 nla_get_u8(tb[TCA_FLOWER_KEY_VLAN_PRIO]) & 503 VLAN_PRIORITY_MASK; 504 key_mask->vlan_priority = VLAN_PRIORITY_MASK; 505 } 506 } 507 508 static void fl_set_key_flag(u32 flower_key, u32 flower_mask, 509 u32 *dissector_key, u32 *dissector_mask, 510 u32 flower_flag_bit, u32 dissector_flag_bit) 511 { 512 if (flower_mask & flower_flag_bit) { 513 *dissector_mask |= dissector_flag_bit; 514 if (flower_key & flower_flag_bit) 515 *dissector_key |= dissector_flag_bit; 516 } 517 } 518 519 static int fl_set_key_flags(struct nlattr **tb, 520 u32 *flags_key, u32 *flags_mask) 521 { 522 u32 key, mask; 523 524 /* mask is mandatory for flags */ 525 if (!tb[TCA_FLOWER_KEY_FLAGS_MASK]) 526 return -EINVAL; 527 528 key = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS])); 529 mask = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS_MASK])); 530 531 *flags_key = 0; 532 *flags_mask = 0; 533 534 fl_set_key_flag(key, mask, flags_key, flags_mask, 535 TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT); 536 537 return 0; 538 } 539 540 static void fl_set_key_ip(struct nlattr **tb, 541 struct flow_dissector_key_ip *key, 542 struct flow_dissector_key_ip *mask) 543 { 544 fl_set_key_val(tb, &key->tos, TCA_FLOWER_KEY_IP_TOS, 545 &mask->tos, TCA_FLOWER_KEY_IP_TOS_MASK, 546 sizeof(key->tos)); 547 548 fl_set_key_val(tb, &key->ttl, TCA_FLOWER_KEY_IP_TTL, 549 &mask->ttl, TCA_FLOWER_KEY_IP_TTL_MASK, 550 sizeof(key->ttl)); 551 } 552 553 static int fl_set_key(struct net *net, struct nlattr **tb, 554 struct fl_flow_key *key, struct fl_flow_key *mask) 555 { 556 __be16 ethertype; 557 int ret = 0; 558 #ifdef CONFIG_NET_CLS_IND 559 if (tb[TCA_FLOWER_INDEV]) { 560 int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]); 561 if (err < 0) 562 return err; 563 key->indev_ifindex = err; 564 mask->indev_ifindex = 0xffffffff; 565 } 566 #endif 567 568 fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST, 569 mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK, 570 sizeof(key->eth.dst)); 571 fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC, 572 mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK, 573 sizeof(key->eth.src)); 574 575 if (tb[TCA_FLOWER_KEY_ETH_TYPE]) { 576 ethertype = nla_get_be16(tb[TCA_FLOWER_KEY_ETH_TYPE]); 577 578 if (ethertype == htons(ETH_P_8021Q)) { 579 fl_set_key_vlan(tb, &key->vlan, &mask->vlan); 580 fl_set_key_val(tb, &key->basic.n_proto, 581 TCA_FLOWER_KEY_VLAN_ETH_TYPE, 582 &mask->basic.n_proto, TCA_FLOWER_UNSPEC, 583 sizeof(key->basic.n_proto)); 584 } else { 585 key->basic.n_proto = ethertype; 586 mask->basic.n_proto = cpu_to_be16(~0); 587 } 588 } 589 590 if (key->basic.n_proto == htons(ETH_P_IP) || 591 key->basic.n_proto == htons(ETH_P_IPV6)) { 592 fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO, 593 &mask->basic.ip_proto, TCA_FLOWER_UNSPEC, 594 sizeof(key->basic.ip_proto)); 595 fl_set_key_ip(tb, &key->ip, &mask->ip); 596 } 597 598 if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) { 599 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 600 mask->control.addr_type = ~0; 601 fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC, 602 &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK, 603 sizeof(key->ipv4.src)); 604 fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST, 605 &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK, 606 sizeof(key->ipv4.dst)); 607 } else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) { 608 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 609 mask->control.addr_type = ~0; 610 fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC, 611 &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK, 612 sizeof(key->ipv6.src)); 613 fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST, 614 &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK, 615 sizeof(key->ipv6.dst)); 616 } 617 618 if (key->basic.ip_proto == IPPROTO_TCP) { 619 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC, 620 &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK, 621 sizeof(key->tp.src)); 622 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST, 623 &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK, 624 sizeof(key->tp.dst)); 625 fl_set_key_val(tb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS, 626 &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK, 627 sizeof(key->tcp.flags)); 628 } else if (key->basic.ip_proto == IPPROTO_UDP) { 629 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC, 630 &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK, 631 sizeof(key->tp.src)); 632 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST, 633 &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK, 634 sizeof(key->tp.dst)); 635 } else if (key->basic.ip_proto == IPPROTO_SCTP) { 636 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC, 637 &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK, 638 sizeof(key->tp.src)); 639 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST, 640 &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK, 641 sizeof(key->tp.dst)); 642 } else if (key->basic.n_proto == htons(ETH_P_IP) && 643 key->basic.ip_proto == IPPROTO_ICMP) { 644 fl_set_key_val(tb, &key->icmp.type, TCA_FLOWER_KEY_ICMPV4_TYPE, 645 &mask->icmp.type, 646 TCA_FLOWER_KEY_ICMPV4_TYPE_MASK, 647 sizeof(key->icmp.type)); 648 fl_set_key_val(tb, &key->icmp.code, TCA_FLOWER_KEY_ICMPV4_CODE, 649 &mask->icmp.code, 650 TCA_FLOWER_KEY_ICMPV4_CODE_MASK, 651 sizeof(key->icmp.code)); 652 } else if (key->basic.n_proto == htons(ETH_P_IPV6) && 653 key->basic.ip_proto == IPPROTO_ICMPV6) { 654 fl_set_key_val(tb, &key->icmp.type, TCA_FLOWER_KEY_ICMPV6_TYPE, 655 &mask->icmp.type, 656 TCA_FLOWER_KEY_ICMPV6_TYPE_MASK, 657 sizeof(key->icmp.type)); 658 fl_set_key_val(tb, &key->icmp.code, TCA_FLOWER_KEY_ICMPV6_CODE, 659 &mask->icmp.code, 660 TCA_FLOWER_KEY_ICMPV6_CODE_MASK, 661 sizeof(key->icmp.code)); 662 } else if (key->basic.n_proto == htons(ETH_P_MPLS_UC) || 663 key->basic.n_proto == htons(ETH_P_MPLS_MC)) { 664 ret = fl_set_key_mpls(tb, &key->mpls, &mask->mpls); 665 if (ret) 666 return ret; 667 } else if (key->basic.n_proto == htons(ETH_P_ARP) || 668 key->basic.n_proto == htons(ETH_P_RARP)) { 669 fl_set_key_val(tb, &key->arp.sip, TCA_FLOWER_KEY_ARP_SIP, 670 &mask->arp.sip, TCA_FLOWER_KEY_ARP_SIP_MASK, 671 sizeof(key->arp.sip)); 672 fl_set_key_val(tb, &key->arp.tip, TCA_FLOWER_KEY_ARP_TIP, 673 &mask->arp.tip, TCA_FLOWER_KEY_ARP_TIP_MASK, 674 sizeof(key->arp.tip)); 675 fl_set_key_val(tb, &key->arp.op, TCA_FLOWER_KEY_ARP_OP, 676 &mask->arp.op, TCA_FLOWER_KEY_ARP_OP_MASK, 677 sizeof(key->arp.op)); 678 fl_set_key_val(tb, key->arp.sha, TCA_FLOWER_KEY_ARP_SHA, 679 mask->arp.sha, TCA_FLOWER_KEY_ARP_SHA_MASK, 680 sizeof(key->arp.sha)); 681 fl_set_key_val(tb, key->arp.tha, TCA_FLOWER_KEY_ARP_THA, 682 mask->arp.tha, TCA_FLOWER_KEY_ARP_THA_MASK, 683 sizeof(key->arp.tha)); 684 } 685 686 if (tb[TCA_FLOWER_KEY_ENC_IPV4_SRC] || 687 tb[TCA_FLOWER_KEY_ENC_IPV4_DST]) { 688 key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 689 mask->enc_control.addr_type = ~0; 690 fl_set_key_val(tb, &key->enc_ipv4.src, 691 TCA_FLOWER_KEY_ENC_IPV4_SRC, 692 &mask->enc_ipv4.src, 693 TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK, 694 sizeof(key->enc_ipv4.src)); 695 fl_set_key_val(tb, &key->enc_ipv4.dst, 696 TCA_FLOWER_KEY_ENC_IPV4_DST, 697 &mask->enc_ipv4.dst, 698 TCA_FLOWER_KEY_ENC_IPV4_DST_MASK, 699 sizeof(key->enc_ipv4.dst)); 700 } 701 702 if (tb[TCA_FLOWER_KEY_ENC_IPV6_SRC] || 703 tb[TCA_FLOWER_KEY_ENC_IPV6_DST]) { 704 key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 705 mask->enc_control.addr_type = ~0; 706 fl_set_key_val(tb, &key->enc_ipv6.src, 707 TCA_FLOWER_KEY_ENC_IPV6_SRC, 708 &mask->enc_ipv6.src, 709 TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK, 710 sizeof(key->enc_ipv6.src)); 711 fl_set_key_val(tb, &key->enc_ipv6.dst, 712 TCA_FLOWER_KEY_ENC_IPV6_DST, 713 &mask->enc_ipv6.dst, 714 TCA_FLOWER_KEY_ENC_IPV6_DST_MASK, 715 sizeof(key->enc_ipv6.dst)); 716 } 717 718 fl_set_key_val(tb, &key->enc_key_id.keyid, TCA_FLOWER_KEY_ENC_KEY_ID, 719 &mask->enc_key_id.keyid, TCA_FLOWER_UNSPEC, 720 sizeof(key->enc_key_id.keyid)); 721 722 fl_set_key_val(tb, &key->enc_tp.src, TCA_FLOWER_KEY_ENC_UDP_SRC_PORT, 723 &mask->enc_tp.src, TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK, 724 sizeof(key->enc_tp.src)); 725 726 fl_set_key_val(tb, &key->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT, 727 &mask->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK, 728 sizeof(key->enc_tp.dst)); 729 730 if (tb[TCA_FLOWER_KEY_FLAGS]) 731 ret = fl_set_key_flags(tb, &key->control.flags, &mask->control.flags); 732 733 return ret; 734 } 735 736 static bool fl_mask_eq(struct fl_flow_mask *mask1, 737 struct fl_flow_mask *mask2) 738 { 739 const long *lmask1 = fl_key_get_start(&mask1->key, mask1); 740 const long *lmask2 = fl_key_get_start(&mask2->key, mask2); 741 742 return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) && 743 !memcmp(lmask1, lmask2, fl_mask_range(mask1)); 744 } 745 746 static const struct rhashtable_params fl_ht_params = { 747 .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */ 748 .head_offset = offsetof(struct cls_fl_filter, ht_node), 749 .automatic_shrinking = true, 750 }; 751 752 static int fl_init_hashtable(struct cls_fl_head *head, 753 struct fl_flow_mask *mask) 754 { 755 head->ht_params = fl_ht_params; 756 head->ht_params.key_len = fl_mask_range(mask); 757 head->ht_params.key_offset += mask->range.start; 758 759 return rhashtable_init(&head->ht, &head->ht_params); 760 } 761 762 #define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member) 763 #define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member)) 764 765 #define FL_KEY_IS_MASKED(mask, member) \ 766 memchr_inv(((char *)mask) + FL_KEY_MEMBER_OFFSET(member), \ 767 0, FL_KEY_MEMBER_SIZE(member)) \ 768 769 #define FL_KEY_SET(keys, cnt, id, member) \ 770 do { \ 771 keys[cnt].key_id = id; \ 772 keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member); \ 773 cnt++; \ 774 } while(0); 775 776 #define FL_KEY_SET_IF_MASKED(mask, keys, cnt, id, member) \ 777 do { \ 778 if (FL_KEY_IS_MASKED(mask, member)) \ 779 FL_KEY_SET(keys, cnt, id, member); \ 780 } while(0); 781 782 static void fl_init_dissector(struct cls_fl_head *head, 783 struct fl_flow_mask *mask) 784 { 785 struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX]; 786 size_t cnt = 0; 787 788 FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control); 789 FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic); 790 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 791 FLOW_DISSECTOR_KEY_ETH_ADDRS, eth); 792 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 793 FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4); 794 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 795 FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6); 796 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 797 FLOW_DISSECTOR_KEY_PORTS, tp); 798 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 799 FLOW_DISSECTOR_KEY_IP, ip); 800 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 801 FLOW_DISSECTOR_KEY_TCP, tcp); 802 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 803 FLOW_DISSECTOR_KEY_ICMP, icmp); 804 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 805 FLOW_DISSECTOR_KEY_ARP, arp); 806 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 807 FLOW_DISSECTOR_KEY_MPLS, mpls); 808 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 809 FLOW_DISSECTOR_KEY_VLAN, vlan); 810 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 811 FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id); 812 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 813 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, enc_ipv4); 814 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 815 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, enc_ipv6); 816 if (FL_KEY_IS_MASKED(&mask->key, enc_ipv4) || 817 FL_KEY_IS_MASKED(&mask->key, enc_ipv6)) 818 FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_CONTROL, 819 enc_control); 820 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt, 821 FLOW_DISSECTOR_KEY_ENC_PORTS, enc_tp); 822 823 skb_flow_dissector_init(&head->dissector, keys, cnt); 824 } 825 826 static int fl_check_assign_mask(struct cls_fl_head *head, 827 struct fl_flow_mask *mask) 828 { 829 int err; 830 831 if (head->mask_assigned) { 832 if (!fl_mask_eq(&head->mask, mask)) 833 return -EINVAL; 834 else 835 return 0; 836 } 837 838 /* Mask is not assigned yet. So assign it and init hashtable 839 * according to that. 840 */ 841 err = fl_init_hashtable(head, mask); 842 if (err) 843 return err; 844 memcpy(&head->mask, mask, sizeof(head->mask)); 845 head->mask_assigned = true; 846 847 fl_init_dissector(head, mask); 848 849 return 0; 850 } 851 852 static int fl_set_parms(struct net *net, struct tcf_proto *tp, 853 struct cls_fl_filter *f, struct fl_flow_mask *mask, 854 unsigned long base, struct nlattr **tb, 855 struct nlattr *est, bool ovr) 856 { 857 int err; 858 859 err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr); 860 if (err < 0) 861 return err; 862 863 if (tb[TCA_FLOWER_CLASSID]) { 864 f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]); 865 tcf_bind_filter(tp, &f->res, base); 866 } 867 868 err = fl_set_key(net, tb, &f->key, &mask->key); 869 if (err) 870 return err; 871 872 fl_mask_update_range(mask); 873 fl_set_masked_key(&f->mkey, &f->key, mask); 874 875 return 0; 876 } 877 878 static int fl_change(struct net *net, struct sk_buff *in_skb, 879 struct tcf_proto *tp, unsigned long base, 880 u32 handle, struct nlattr **tca, 881 void **arg, bool ovr) 882 { 883 struct cls_fl_head *head = rtnl_dereference(tp->root); 884 struct cls_fl_filter *fold = *arg; 885 struct cls_fl_filter *fnew; 886 struct nlattr **tb; 887 struct fl_flow_mask mask = {}; 888 unsigned long idr_index; 889 int err; 890 891 if (!tca[TCA_OPTIONS]) 892 return -EINVAL; 893 894 tb = kcalloc(TCA_FLOWER_MAX + 1, sizeof(struct nlattr *), GFP_KERNEL); 895 if (!tb) 896 return -ENOBUFS; 897 898 err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], 899 fl_policy, NULL); 900 if (err < 0) 901 goto errout_tb; 902 903 if (fold && handle && fold->handle != handle) { 904 err = -EINVAL; 905 goto errout_tb; 906 } 907 908 fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); 909 if (!fnew) { 910 err = -ENOBUFS; 911 goto errout_tb; 912 } 913 914 err = tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0); 915 if (err < 0) 916 goto errout; 917 918 if (!handle) { 919 err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index, 920 1, 0x80000000, GFP_KERNEL); 921 if (err) 922 goto errout; 923 fnew->handle = idr_index; 924 } 925 926 /* user specifies a handle and it doesn't exist */ 927 if (handle && !fold) { 928 err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index, 929 handle, handle + 1, GFP_KERNEL); 930 if (err) 931 goto errout; 932 fnew->handle = idr_index; 933 } 934 935 if (tb[TCA_FLOWER_FLAGS]) { 936 fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]); 937 938 if (!tc_flags_valid(fnew->flags)) { 939 err = -EINVAL; 940 goto errout_idr; 941 } 942 } 943 944 err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr); 945 if (err) 946 goto errout_idr; 947 948 err = fl_check_assign_mask(head, &mask); 949 if (err) 950 goto errout_idr; 951 952 if (!tc_skip_sw(fnew->flags)) { 953 if (!fold && fl_lookup(head, &fnew->mkey)) { 954 err = -EEXIST; 955 goto errout_idr; 956 } 957 958 err = rhashtable_insert_fast(&head->ht, &fnew->ht_node, 959 head->ht_params); 960 if (err) 961 goto errout_idr; 962 } 963 964 if (!tc_skip_hw(fnew->flags)) { 965 err = fl_hw_replace_filter(tp, 966 &head->dissector, 967 &mask.key, 968 fnew); 969 if (err) 970 goto errout_idr; 971 } 972 973 if (!tc_in_hw(fnew->flags)) 974 fnew->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 975 976 if (fold) { 977 if (!tc_skip_sw(fold->flags)) 978 rhashtable_remove_fast(&head->ht, &fold->ht_node, 979 head->ht_params); 980 if (!tc_skip_hw(fold->flags)) 981 fl_hw_destroy_filter(tp, fold); 982 } 983 984 *arg = fnew; 985 986 if (fold) { 987 fnew->handle = handle; 988 idr_replace_ext(&head->handle_idr, fnew, fnew->handle); 989 list_replace_rcu(&fold->list, &fnew->list); 990 tcf_unbind_filter(tp, &fold->res); 991 call_rcu(&fold->rcu, fl_destroy_filter); 992 } else { 993 list_add_tail_rcu(&fnew->list, &head->filters); 994 } 995 996 kfree(tb); 997 return 0; 998 999 errout_idr: 1000 if (fnew->handle) 1001 idr_remove_ext(&head->handle_idr, fnew->handle); 1002 errout: 1003 tcf_exts_destroy(&fnew->exts); 1004 kfree(fnew); 1005 errout_tb: 1006 kfree(tb); 1007 return err; 1008 } 1009 1010 static int fl_delete(struct tcf_proto *tp, void *arg, bool *last) 1011 { 1012 struct cls_fl_head *head = rtnl_dereference(tp->root); 1013 struct cls_fl_filter *f = arg; 1014 1015 if (!tc_skip_sw(f->flags)) 1016 rhashtable_remove_fast(&head->ht, &f->ht_node, 1017 head->ht_params); 1018 __fl_delete(tp, f); 1019 *last = list_empty(&head->filters); 1020 return 0; 1021 } 1022 1023 static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg) 1024 { 1025 struct cls_fl_head *head = rtnl_dereference(tp->root); 1026 struct cls_fl_filter *f; 1027 1028 list_for_each_entry_rcu(f, &head->filters, list) { 1029 if (arg->count < arg->skip) 1030 goto skip; 1031 if (arg->fn(tp, f, arg) < 0) { 1032 arg->stop = 1; 1033 break; 1034 } 1035 skip: 1036 arg->count++; 1037 } 1038 } 1039 1040 static int fl_dump_key_val(struct sk_buff *skb, 1041 void *val, int val_type, 1042 void *mask, int mask_type, int len) 1043 { 1044 int err; 1045 1046 if (!memchr_inv(mask, 0, len)) 1047 return 0; 1048 err = nla_put(skb, val_type, len, val); 1049 if (err) 1050 return err; 1051 if (mask_type != TCA_FLOWER_UNSPEC) { 1052 err = nla_put(skb, mask_type, len, mask); 1053 if (err) 1054 return err; 1055 } 1056 return 0; 1057 } 1058 1059 static int fl_dump_key_mpls(struct sk_buff *skb, 1060 struct flow_dissector_key_mpls *mpls_key, 1061 struct flow_dissector_key_mpls *mpls_mask) 1062 { 1063 int err; 1064 1065 if (!memchr_inv(mpls_mask, 0, sizeof(*mpls_mask))) 1066 return 0; 1067 if (mpls_mask->mpls_ttl) { 1068 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TTL, 1069 mpls_key->mpls_ttl); 1070 if (err) 1071 return err; 1072 } 1073 if (mpls_mask->mpls_tc) { 1074 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TC, 1075 mpls_key->mpls_tc); 1076 if (err) 1077 return err; 1078 } 1079 if (mpls_mask->mpls_label) { 1080 err = nla_put_u32(skb, TCA_FLOWER_KEY_MPLS_LABEL, 1081 mpls_key->mpls_label); 1082 if (err) 1083 return err; 1084 } 1085 if (mpls_mask->mpls_bos) { 1086 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_BOS, 1087 mpls_key->mpls_bos); 1088 if (err) 1089 return err; 1090 } 1091 return 0; 1092 } 1093 1094 static int fl_dump_key_ip(struct sk_buff *skb, 1095 struct flow_dissector_key_ip *key, 1096 struct flow_dissector_key_ip *mask) 1097 { 1098 if (fl_dump_key_val(skb, &key->tos, TCA_FLOWER_KEY_IP_TOS, &mask->tos, 1099 TCA_FLOWER_KEY_IP_TOS_MASK, sizeof(key->tos)) || 1100 fl_dump_key_val(skb, &key->ttl, TCA_FLOWER_KEY_IP_TTL, &mask->ttl, 1101 TCA_FLOWER_KEY_IP_TTL_MASK, sizeof(key->ttl))) 1102 return -1; 1103 1104 return 0; 1105 } 1106 1107 static int fl_dump_key_vlan(struct sk_buff *skb, 1108 struct flow_dissector_key_vlan *vlan_key, 1109 struct flow_dissector_key_vlan *vlan_mask) 1110 { 1111 int err; 1112 1113 if (!memchr_inv(vlan_mask, 0, sizeof(*vlan_mask))) 1114 return 0; 1115 if (vlan_mask->vlan_id) { 1116 err = nla_put_u16(skb, TCA_FLOWER_KEY_VLAN_ID, 1117 vlan_key->vlan_id); 1118 if (err) 1119 return err; 1120 } 1121 if (vlan_mask->vlan_priority) { 1122 err = nla_put_u8(skb, TCA_FLOWER_KEY_VLAN_PRIO, 1123 vlan_key->vlan_priority); 1124 if (err) 1125 return err; 1126 } 1127 return 0; 1128 } 1129 1130 static void fl_get_key_flag(u32 dissector_key, u32 dissector_mask, 1131 u32 *flower_key, u32 *flower_mask, 1132 u32 flower_flag_bit, u32 dissector_flag_bit) 1133 { 1134 if (dissector_mask & dissector_flag_bit) { 1135 *flower_mask |= flower_flag_bit; 1136 if (dissector_key & dissector_flag_bit) 1137 *flower_key |= flower_flag_bit; 1138 } 1139 } 1140 1141 static int fl_dump_key_flags(struct sk_buff *skb, u32 flags_key, u32 flags_mask) 1142 { 1143 u32 key, mask; 1144 __be32 _key, _mask; 1145 int err; 1146 1147 if (!memchr_inv(&flags_mask, 0, sizeof(flags_mask))) 1148 return 0; 1149 1150 key = 0; 1151 mask = 0; 1152 1153 fl_get_key_flag(flags_key, flags_mask, &key, &mask, 1154 TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT); 1155 1156 _key = cpu_to_be32(key); 1157 _mask = cpu_to_be32(mask); 1158 1159 err = nla_put(skb, TCA_FLOWER_KEY_FLAGS, 4, &_key); 1160 if (err) 1161 return err; 1162 1163 return nla_put(skb, TCA_FLOWER_KEY_FLAGS_MASK, 4, &_mask); 1164 } 1165 1166 static int fl_dump(struct net *net, struct tcf_proto *tp, void *fh, 1167 struct sk_buff *skb, struct tcmsg *t) 1168 { 1169 struct cls_fl_head *head = rtnl_dereference(tp->root); 1170 struct cls_fl_filter *f = fh; 1171 struct nlattr *nest; 1172 struct fl_flow_key *key, *mask; 1173 1174 if (!f) 1175 return skb->len; 1176 1177 t->tcm_handle = f->handle; 1178 1179 nest = nla_nest_start(skb, TCA_OPTIONS); 1180 if (!nest) 1181 goto nla_put_failure; 1182 1183 if (f->res.classid && 1184 nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid)) 1185 goto nla_put_failure; 1186 1187 key = &f->key; 1188 mask = &head->mask.key; 1189 1190 if (mask->indev_ifindex) { 1191 struct net_device *dev; 1192 1193 dev = __dev_get_by_index(net, key->indev_ifindex); 1194 if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name)) 1195 goto nla_put_failure; 1196 } 1197 1198 if (!tc_skip_hw(f->flags)) 1199 fl_hw_update_stats(tp, f); 1200 1201 if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST, 1202 mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK, 1203 sizeof(key->eth.dst)) || 1204 fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC, 1205 mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK, 1206 sizeof(key->eth.src)) || 1207 fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE, 1208 &mask->basic.n_proto, TCA_FLOWER_UNSPEC, 1209 sizeof(key->basic.n_proto))) 1210 goto nla_put_failure; 1211 1212 if (fl_dump_key_mpls(skb, &key->mpls, &mask->mpls)) 1213 goto nla_put_failure; 1214 1215 if (fl_dump_key_vlan(skb, &key->vlan, &mask->vlan)) 1216 goto nla_put_failure; 1217 1218 if ((key->basic.n_proto == htons(ETH_P_IP) || 1219 key->basic.n_proto == htons(ETH_P_IPV6)) && 1220 (fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO, 1221 &mask->basic.ip_proto, TCA_FLOWER_UNSPEC, 1222 sizeof(key->basic.ip_proto)) || 1223 fl_dump_key_ip(skb, &key->ip, &mask->ip))) 1224 goto nla_put_failure; 1225 1226 if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS && 1227 (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC, 1228 &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK, 1229 sizeof(key->ipv4.src)) || 1230 fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST, 1231 &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK, 1232 sizeof(key->ipv4.dst)))) 1233 goto nla_put_failure; 1234 else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS && 1235 (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC, 1236 &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK, 1237 sizeof(key->ipv6.src)) || 1238 fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST, 1239 &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK, 1240 sizeof(key->ipv6.dst)))) 1241 goto nla_put_failure; 1242 1243 if (key->basic.ip_proto == IPPROTO_TCP && 1244 (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC, 1245 &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK, 1246 sizeof(key->tp.src)) || 1247 fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST, 1248 &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK, 1249 sizeof(key->tp.dst)) || 1250 fl_dump_key_val(skb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS, 1251 &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK, 1252 sizeof(key->tcp.flags)))) 1253 goto nla_put_failure; 1254 else if (key->basic.ip_proto == IPPROTO_UDP && 1255 (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC, 1256 &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK, 1257 sizeof(key->tp.src)) || 1258 fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST, 1259 &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK, 1260 sizeof(key->tp.dst)))) 1261 goto nla_put_failure; 1262 else if (key->basic.ip_proto == IPPROTO_SCTP && 1263 (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC, 1264 &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK, 1265 sizeof(key->tp.src)) || 1266 fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST, 1267 &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK, 1268 sizeof(key->tp.dst)))) 1269 goto nla_put_failure; 1270 else if (key->basic.n_proto == htons(ETH_P_IP) && 1271 key->basic.ip_proto == IPPROTO_ICMP && 1272 (fl_dump_key_val(skb, &key->icmp.type, 1273 TCA_FLOWER_KEY_ICMPV4_TYPE, &mask->icmp.type, 1274 TCA_FLOWER_KEY_ICMPV4_TYPE_MASK, 1275 sizeof(key->icmp.type)) || 1276 fl_dump_key_val(skb, &key->icmp.code, 1277 TCA_FLOWER_KEY_ICMPV4_CODE, &mask->icmp.code, 1278 TCA_FLOWER_KEY_ICMPV4_CODE_MASK, 1279 sizeof(key->icmp.code)))) 1280 goto nla_put_failure; 1281 else if (key->basic.n_proto == htons(ETH_P_IPV6) && 1282 key->basic.ip_proto == IPPROTO_ICMPV6 && 1283 (fl_dump_key_val(skb, &key->icmp.type, 1284 TCA_FLOWER_KEY_ICMPV6_TYPE, &mask->icmp.type, 1285 TCA_FLOWER_KEY_ICMPV6_TYPE_MASK, 1286 sizeof(key->icmp.type)) || 1287 fl_dump_key_val(skb, &key->icmp.code, 1288 TCA_FLOWER_KEY_ICMPV6_CODE, &mask->icmp.code, 1289 TCA_FLOWER_KEY_ICMPV6_CODE_MASK, 1290 sizeof(key->icmp.code)))) 1291 goto nla_put_failure; 1292 else if ((key->basic.n_proto == htons(ETH_P_ARP) || 1293 key->basic.n_proto == htons(ETH_P_RARP)) && 1294 (fl_dump_key_val(skb, &key->arp.sip, 1295 TCA_FLOWER_KEY_ARP_SIP, &mask->arp.sip, 1296 TCA_FLOWER_KEY_ARP_SIP_MASK, 1297 sizeof(key->arp.sip)) || 1298 fl_dump_key_val(skb, &key->arp.tip, 1299 TCA_FLOWER_KEY_ARP_TIP, &mask->arp.tip, 1300 TCA_FLOWER_KEY_ARP_TIP_MASK, 1301 sizeof(key->arp.tip)) || 1302 fl_dump_key_val(skb, &key->arp.op, 1303 TCA_FLOWER_KEY_ARP_OP, &mask->arp.op, 1304 TCA_FLOWER_KEY_ARP_OP_MASK, 1305 sizeof(key->arp.op)) || 1306 fl_dump_key_val(skb, key->arp.sha, TCA_FLOWER_KEY_ARP_SHA, 1307 mask->arp.sha, TCA_FLOWER_KEY_ARP_SHA_MASK, 1308 sizeof(key->arp.sha)) || 1309 fl_dump_key_val(skb, key->arp.tha, TCA_FLOWER_KEY_ARP_THA, 1310 mask->arp.tha, TCA_FLOWER_KEY_ARP_THA_MASK, 1311 sizeof(key->arp.tha)))) 1312 goto nla_put_failure; 1313 1314 if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS && 1315 (fl_dump_key_val(skb, &key->enc_ipv4.src, 1316 TCA_FLOWER_KEY_ENC_IPV4_SRC, &mask->enc_ipv4.src, 1317 TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK, 1318 sizeof(key->enc_ipv4.src)) || 1319 fl_dump_key_val(skb, &key->enc_ipv4.dst, 1320 TCA_FLOWER_KEY_ENC_IPV4_DST, &mask->enc_ipv4.dst, 1321 TCA_FLOWER_KEY_ENC_IPV4_DST_MASK, 1322 sizeof(key->enc_ipv4.dst)))) 1323 goto nla_put_failure; 1324 else if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS && 1325 (fl_dump_key_val(skb, &key->enc_ipv6.src, 1326 TCA_FLOWER_KEY_ENC_IPV6_SRC, &mask->enc_ipv6.src, 1327 TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK, 1328 sizeof(key->enc_ipv6.src)) || 1329 fl_dump_key_val(skb, &key->enc_ipv6.dst, 1330 TCA_FLOWER_KEY_ENC_IPV6_DST, 1331 &mask->enc_ipv6.dst, 1332 TCA_FLOWER_KEY_ENC_IPV6_DST_MASK, 1333 sizeof(key->enc_ipv6.dst)))) 1334 goto nla_put_failure; 1335 1336 if (fl_dump_key_val(skb, &key->enc_key_id, TCA_FLOWER_KEY_ENC_KEY_ID, 1337 &mask->enc_key_id, TCA_FLOWER_UNSPEC, 1338 sizeof(key->enc_key_id)) || 1339 fl_dump_key_val(skb, &key->enc_tp.src, 1340 TCA_FLOWER_KEY_ENC_UDP_SRC_PORT, 1341 &mask->enc_tp.src, 1342 TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK, 1343 sizeof(key->enc_tp.src)) || 1344 fl_dump_key_val(skb, &key->enc_tp.dst, 1345 TCA_FLOWER_KEY_ENC_UDP_DST_PORT, 1346 &mask->enc_tp.dst, 1347 TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK, 1348 sizeof(key->enc_tp.dst))) 1349 goto nla_put_failure; 1350 1351 if (fl_dump_key_flags(skb, key->control.flags, mask->control.flags)) 1352 goto nla_put_failure; 1353 1354 if (f->flags && nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags)) 1355 goto nla_put_failure; 1356 1357 if (tcf_exts_dump(skb, &f->exts)) 1358 goto nla_put_failure; 1359 1360 nla_nest_end(skb, nest); 1361 1362 if (tcf_exts_dump_stats(skb, &f->exts) < 0) 1363 goto nla_put_failure; 1364 1365 return skb->len; 1366 1367 nla_put_failure: 1368 nla_nest_cancel(skb, nest); 1369 return -1; 1370 } 1371 1372 static void fl_bind_class(void *fh, u32 classid, unsigned long cl) 1373 { 1374 struct cls_fl_filter *f = fh; 1375 1376 if (f && f->res.classid == classid) 1377 f->res.class = cl; 1378 } 1379 1380 static struct tcf_proto_ops cls_fl_ops __read_mostly = { 1381 .kind = "flower", 1382 .classify = fl_classify, 1383 .init = fl_init, 1384 .destroy = fl_destroy, 1385 .get = fl_get, 1386 .change = fl_change, 1387 .delete = fl_delete, 1388 .walk = fl_walk, 1389 .dump = fl_dump, 1390 .bind_class = fl_bind_class, 1391 .owner = THIS_MODULE, 1392 }; 1393 1394 static int __init cls_fl_init(void) 1395 { 1396 return register_tcf_proto_ops(&cls_fl_ops); 1397 } 1398 1399 static void __exit cls_fl_exit(void) 1400 { 1401 unregister_tcf_proto_ops(&cls_fl_ops); 1402 } 1403 1404 module_init(cls_fl_init); 1405 module_exit(cls_fl_exit); 1406 1407 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>"); 1408 MODULE_DESCRIPTION("Flower classifier"); 1409 MODULE_LICENSE("GPL v2"); 1410