1 /* 2 * net/sched/ife.c Inter-FE action based on ForCES WG InterFE LFB 3 * 4 * Refer to: 5 * draft-ietf-forces-interfelfb-03 6 * and 7 * netdev01 paper: 8 * "Distributing Linux Traffic Control Classifier-Action 9 * Subsystem" 10 * Authors: Jamal Hadi Salim and Damascene M. Joachimpillai 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * 17 * copyright Jamal Hadi Salim (2015) 18 * 19 */ 20 21 #include <linux/types.h> 22 #include <linux/kernel.h> 23 #include <linux/string.h> 24 #include <linux/errno.h> 25 #include <linux/skbuff.h> 26 #include <linux/rtnetlink.h> 27 #include <linux/module.h> 28 #include <linux/init.h> 29 #include <net/net_namespace.h> 30 #include <net/netlink.h> 31 #include <net/pkt_sched.h> 32 #include <uapi/linux/tc_act/tc_ife.h> 33 #include <net/tc_act/tc_ife.h> 34 #include <linux/etherdevice.h> 35 #include <net/ife.h> 36 37 static unsigned int ife_net_id; 38 static int max_metacnt = IFE_META_MAX + 1; 39 static struct tc_action_ops act_ife_ops; 40 41 static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = { 42 [TCA_IFE_PARMS] = { .len = sizeof(struct tc_ife)}, 43 [TCA_IFE_DMAC] = { .len = ETH_ALEN}, 44 [TCA_IFE_SMAC] = { .len = ETH_ALEN}, 45 [TCA_IFE_TYPE] = { .type = NLA_U16}, 46 }; 47 48 int ife_encode_meta_u16(u16 metaval, void *skbdata, struct tcf_meta_info *mi) 49 { 50 u16 edata = 0; 51 52 if (mi->metaval) 53 edata = *(u16 *)mi->metaval; 54 else if (metaval) 55 edata = metaval; 56 57 if (!edata) /* will not encode */ 58 return 0; 59 60 edata = htons(edata); 61 return ife_tlv_meta_encode(skbdata, mi->metaid, 2, &edata); 62 } 63 EXPORT_SYMBOL_GPL(ife_encode_meta_u16); 64 65 int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi) 66 { 67 if (mi->metaval) 68 return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval); 69 else 70 return nla_put(skb, mi->metaid, 0, NULL); 71 } 72 EXPORT_SYMBOL_GPL(ife_get_meta_u32); 73 74 int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi) 75 { 76 if (metaval || mi->metaval) 77 return 8; /* T+L+V == 2+2+4 */ 78 79 return 0; 80 } 81 EXPORT_SYMBOL_GPL(ife_check_meta_u32); 82 83 int ife_check_meta_u16(u16 metaval, struct tcf_meta_info *mi) 84 { 85 if (metaval || mi->metaval) 86 return 8; /* T+L+(V) == 2+2+(2+2bytepad) */ 87 88 return 0; 89 } 90 EXPORT_SYMBOL_GPL(ife_check_meta_u16); 91 92 int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi) 93 { 94 u32 edata = metaval; 95 96 if (mi->metaval) 97 edata = *(u32 *)mi->metaval; 98 else if (metaval) 99 edata = metaval; 100 101 if (!edata) /* will not encode */ 102 return 0; 103 104 edata = htonl(edata); 105 return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata); 106 } 107 EXPORT_SYMBOL_GPL(ife_encode_meta_u32); 108 109 int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi) 110 { 111 if (mi->metaval) 112 return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval); 113 else 114 return nla_put(skb, mi->metaid, 0, NULL); 115 } 116 EXPORT_SYMBOL_GPL(ife_get_meta_u16); 117 118 int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) 119 { 120 mi->metaval = kmemdup(metaval, sizeof(u32), gfp); 121 if (!mi->metaval) 122 return -ENOMEM; 123 124 return 0; 125 } 126 EXPORT_SYMBOL_GPL(ife_alloc_meta_u32); 127 128 int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) 129 { 130 mi->metaval = kmemdup(metaval, sizeof(u16), gfp); 131 if (!mi->metaval) 132 return -ENOMEM; 133 134 return 0; 135 } 136 EXPORT_SYMBOL_GPL(ife_alloc_meta_u16); 137 138 void ife_release_meta_gen(struct tcf_meta_info *mi) 139 { 140 kfree(mi->metaval); 141 } 142 EXPORT_SYMBOL_GPL(ife_release_meta_gen); 143 144 int ife_validate_meta_u32(void *val, int len) 145 { 146 if (len == sizeof(u32)) 147 return 0; 148 149 return -EINVAL; 150 } 151 EXPORT_SYMBOL_GPL(ife_validate_meta_u32); 152 153 int ife_validate_meta_u16(void *val, int len) 154 { 155 /* length will not include padding */ 156 if (len == sizeof(u16)) 157 return 0; 158 159 return -EINVAL; 160 } 161 EXPORT_SYMBOL_GPL(ife_validate_meta_u16); 162 163 static LIST_HEAD(ifeoplist); 164 static DEFINE_RWLOCK(ife_mod_lock); 165 166 static struct tcf_meta_ops *find_ife_oplist(u16 metaid) 167 { 168 struct tcf_meta_ops *o; 169 170 read_lock(&ife_mod_lock); 171 list_for_each_entry(o, &ifeoplist, list) { 172 if (o->metaid == metaid) { 173 if (!try_module_get(o->owner)) 174 o = NULL; 175 read_unlock(&ife_mod_lock); 176 return o; 177 } 178 } 179 read_unlock(&ife_mod_lock); 180 181 return NULL; 182 } 183 184 int register_ife_op(struct tcf_meta_ops *mops) 185 { 186 struct tcf_meta_ops *m; 187 188 if (!mops->metaid || !mops->metatype || !mops->name || 189 !mops->check_presence || !mops->encode || !mops->decode || 190 !mops->get || !mops->alloc) 191 return -EINVAL; 192 193 write_lock(&ife_mod_lock); 194 195 list_for_each_entry(m, &ifeoplist, list) { 196 if (m->metaid == mops->metaid || 197 (strcmp(mops->name, m->name) == 0)) { 198 write_unlock(&ife_mod_lock); 199 return -EEXIST; 200 } 201 } 202 203 if (!mops->release) 204 mops->release = ife_release_meta_gen; 205 206 list_add_tail(&mops->list, &ifeoplist); 207 write_unlock(&ife_mod_lock); 208 return 0; 209 } 210 EXPORT_SYMBOL_GPL(unregister_ife_op); 211 212 int unregister_ife_op(struct tcf_meta_ops *mops) 213 { 214 struct tcf_meta_ops *m; 215 int err = -ENOENT; 216 217 write_lock(&ife_mod_lock); 218 list_for_each_entry(m, &ifeoplist, list) { 219 if (m->metaid == mops->metaid) { 220 list_del(&mops->list); 221 err = 0; 222 break; 223 } 224 } 225 write_unlock(&ife_mod_lock); 226 227 return err; 228 } 229 EXPORT_SYMBOL_GPL(register_ife_op); 230 231 static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len) 232 { 233 int ret = 0; 234 /* XXX: unfortunately cant use nla_policy at this point 235 * because a length of 0 is valid in the case of 236 * "allow". "use" semantics do enforce for proper 237 * length and i couldve use nla_policy but it makes it hard 238 * to use it just for that.. 239 */ 240 if (ops->validate) 241 return ops->validate(val, len); 242 243 if (ops->metatype == NLA_U32) 244 ret = ife_validate_meta_u32(val, len); 245 else if (ops->metatype == NLA_U16) 246 ret = ife_validate_meta_u16(val, len); 247 248 return ret; 249 } 250 251 /* called when adding new meta information 252 * under ife->tcf_lock for existing action 253 */ 254 static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid, 255 void *val, int len, bool exists) 256 { 257 struct tcf_meta_ops *ops = find_ife_oplist(metaid); 258 int ret = 0; 259 260 if (!ops) { 261 ret = -ENOENT; 262 #ifdef CONFIG_MODULES 263 if (exists) 264 spin_unlock_bh(&ife->tcf_lock); 265 rtnl_unlock(); 266 request_module("ife-meta-%u", metaid); 267 rtnl_lock(); 268 if (exists) 269 spin_lock_bh(&ife->tcf_lock); 270 ops = find_ife_oplist(metaid); 271 #endif 272 } 273 274 if (ops) { 275 ret = 0; 276 if (len) 277 ret = ife_validate_metatype(ops, val, len); 278 279 module_put(ops->owner); 280 } 281 282 return ret; 283 } 284 285 /* called when adding new meta information 286 * under ife->tcf_lock for existing action 287 */ 288 static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval, 289 int len, bool atomic) 290 { 291 struct tcf_meta_info *mi = NULL; 292 struct tcf_meta_ops *ops = find_ife_oplist(metaid); 293 int ret = 0; 294 295 if (!ops) 296 return -ENOENT; 297 298 mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL); 299 if (!mi) { 300 /*put back what find_ife_oplist took */ 301 module_put(ops->owner); 302 return -ENOMEM; 303 } 304 305 mi->metaid = metaid; 306 mi->ops = ops; 307 if (len > 0) { 308 ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL); 309 if (ret != 0) { 310 kfree(mi); 311 module_put(ops->owner); 312 return ret; 313 } 314 } 315 316 list_add_tail(&mi->metalist, &ife->metalist); 317 318 return ret; 319 } 320 321 static int use_all_metadata(struct tcf_ife_info *ife) 322 { 323 struct tcf_meta_ops *o; 324 int rc = 0; 325 int installed = 0; 326 327 read_lock(&ife_mod_lock); 328 list_for_each_entry(o, &ifeoplist, list) { 329 rc = add_metainfo(ife, o->metaid, NULL, 0, true); 330 if (rc == 0) 331 installed += 1; 332 } 333 read_unlock(&ife_mod_lock); 334 335 if (installed) 336 return 0; 337 else 338 return -EINVAL; 339 } 340 341 static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife) 342 { 343 struct tcf_meta_info *e; 344 struct nlattr *nest; 345 unsigned char *b = skb_tail_pointer(skb); 346 int total_encoded = 0; 347 348 /*can only happen on decode */ 349 if (list_empty(&ife->metalist)) 350 return 0; 351 352 nest = nla_nest_start(skb, TCA_IFE_METALST); 353 if (!nest) 354 goto out_nlmsg_trim; 355 356 list_for_each_entry(e, &ife->metalist, metalist) { 357 if (!e->ops->get(skb, e)) 358 total_encoded += 1; 359 } 360 361 if (!total_encoded) 362 goto out_nlmsg_trim; 363 364 nla_nest_end(skb, nest); 365 366 return 0; 367 368 out_nlmsg_trim: 369 nlmsg_trim(skb, b); 370 return -1; 371 } 372 373 /* under ife->tcf_lock */ 374 static void _tcf_ife_cleanup(struct tc_action *a, int bind) 375 { 376 struct tcf_ife_info *ife = to_ife(a); 377 struct tcf_meta_info *e, *n; 378 379 list_for_each_entry_safe(e, n, &ife->metalist, metalist) { 380 module_put(e->ops->owner); 381 list_del(&e->metalist); 382 if (e->metaval) { 383 if (e->ops->release) 384 e->ops->release(e); 385 else 386 kfree(e->metaval); 387 } 388 kfree(e); 389 } 390 } 391 392 static void tcf_ife_cleanup(struct tc_action *a, int bind) 393 { 394 struct tcf_ife_info *ife = to_ife(a); 395 396 spin_lock_bh(&ife->tcf_lock); 397 _tcf_ife_cleanup(a, bind); 398 spin_unlock_bh(&ife->tcf_lock); 399 } 400 401 /* under ife->tcf_lock for existing action */ 402 static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb, 403 bool exists) 404 { 405 int len = 0; 406 int rc = 0; 407 int i = 0; 408 void *val; 409 410 for (i = 1; i < max_metacnt; i++) { 411 if (tb[i]) { 412 val = nla_data(tb[i]); 413 len = nla_len(tb[i]); 414 415 rc = load_metaops_and_vet(ife, i, val, len, exists); 416 if (rc != 0) 417 return rc; 418 419 rc = add_metainfo(ife, i, val, len, exists); 420 if (rc) 421 return rc; 422 } 423 } 424 425 return rc; 426 } 427 428 static int tcf_ife_init(struct net *net, struct nlattr *nla, 429 struct nlattr *est, struct tc_action **a, 430 int ovr, int bind) 431 { 432 struct tc_action_net *tn = net_generic(net, ife_net_id); 433 struct nlattr *tb[TCA_IFE_MAX + 1]; 434 struct nlattr *tb2[IFE_META_MAX + 1]; 435 struct tcf_ife_info *ife; 436 u16 ife_type = ETH_P_IFE; 437 struct tc_ife *parm; 438 u8 *daddr = NULL; 439 u8 *saddr = NULL; 440 bool exists = false; 441 int ret = 0; 442 int err; 443 444 err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy, NULL); 445 if (err < 0) 446 return err; 447 448 if (!tb[TCA_IFE_PARMS]) 449 return -EINVAL; 450 451 parm = nla_data(tb[TCA_IFE_PARMS]); 452 453 exists = tcf_idr_check(tn, parm->index, a, bind); 454 if (exists && bind) 455 return 0; 456 457 if (!exists) { 458 ret = tcf_idr_create(tn, parm->index, est, a, &act_ife_ops, 459 bind, false); 460 if (ret) 461 return ret; 462 ret = ACT_P_CREATED; 463 } else { 464 tcf_idr_release(*a, bind); 465 if (!ovr) 466 return -EEXIST; 467 } 468 469 ife = to_ife(*a); 470 ife->flags = parm->flags; 471 472 if (parm->flags & IFE_ENCODE) { 473 if (tb[TCA_IFE_TYPE]) 474 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]); 475 if (tb[TCA_IFE_DMAC]) 476 daddr = nla_data(tb[TCA_IFE_DMAC]); 477 if (tb[TCA_IFE_SMAC]) 478 saddr = nla_data(tb[TCA_IFE_SMAC]); 479 } 480 481 if (exists) 482 spin_lock_bh(&ife->tcf_lock); 483 ife->tcf_action = parm->action; 484 485 if (parm->flags & IFE_ENCODE) { 486 if (daddr) 487 ether_addr_copy(ife->eth_dst, daddr); 488 else 489 eth_zero_addr(ife->eth_dst); 490 491 if (saddr) 492 ether_addr_copy(ife->eth_src, saddr); 493 else 494 eth_zero_addr(ife->eth_src); 495 496 ife->eth_type = ife_type; 497 } 498 499 if (ret == ACT_P_CREATED) 500 INIT_LIST_HEAD(&ife->metalist); 501 502 if (tb[TCA_IFE_METALST]) { 503 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST], 504 NULL, NULL); 505 if (err) { 506 metadata_parse_err: 507 if (exists) 508 tcf_idr_release(*a, bind); 509 if (ret == ACT_P_CREATED) 510 _tcf_ife_cleanup(*a, bind); 511 512 if (exists) 513 spin_unlock_bh(&ife->tcf_lock); 514 return err; 515 } 516 517 err = populate_metalist(ife, tb2, exists); 518 if (err) 519 goto metadata_parse_err; 520 521 } else { 522 /* if no passed metadata allow list or passed allow-all 523 * then here we process by adding as many supported metadatum 524 * as we can. You better have at least one else we are 525 * going to bail out 526 */ 527 err = use_all_metadata(ife); 528 if (err) { 529 if (ret == ACT_P_CREATED) 530 _tcf_ife_cleanup(*a, bind); 531 532 if (exists) 533 spin_unlock_bh(&ife->tcf_lock); 534 return err; 535 } 536 } 537 538 if (exists) 539 spin_unlock_bh(&ife->tcf_lock); 540 541 if (ret == ACT_P_CREATED) 542 tcf_idr_insert(tn, *a); 543 544 return ret; 545 } 546 547 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind, 548 int ref) 549 { 550 unsigned char *b = skb_tail_pointer(skb); 551 struct tcf_ife_info *ife = to_ife(a); 552 struct tc_ife opt = { 553 .index = ife->tcf_index, 554 .refcnt = ife->tcf_refcnt - ref, 555 .bindcnt = ife->tcf_bindcnt - bind, 556 .action = ife->tcf_action, 557 .flags = ife->flags, 558 }; 559 struct tcf_t t; 560 561 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt)) 562 goto nla_put_failure; 563 564 tcf_tm_dump(&t, &ife->tcf_tm); 565 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD)) 566 goto nla_put_failure; 567 568 if (!is_zero_ether_addr(ife->eth_dst)) { 569 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst)) 570 goto nla_put_failure; 571 } 572 573 if (!is_zero_ether_addr(ife->eth_src)) { 574 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src)) 575 goto nla_put_failure; 576 } 577 578 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type)) 579 goto nla_put_failure; 580 581 if (dump_metalist(skb, ife)) { 582 /*ignore failure to dump metalist */ 583 pr_info("Failed to dump metalist\n"); 584 } 585 586 return skb->len; 587 588 nla_put_failure: 589 nlmsg_trim(skb, b); 590 return -1; 591 } 592 593 static int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife, 594 u16 metaid, u16 mlen, void *mdata) 595 { 596 struct tcf_meta_info *e; 597 598 /* XXX: use hash to speed up */ 599 list_for_each_entry(e, &ife->metalist, metalist) { 600 if (metaid == e->metaid) { 601 if (e->ops) { 602 /* We check for decode presence already */ 603 return e->ops->decode(skb, mdata, mlen); 604 } 605 } 606 } 607 608 return 0; 609 } 610 611 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a, 612 struct tcf_result *res) 613 { 614 struct tcf_ife_info *ife = to_ife(a); 615 int action = ife->tcf_action; 616 u8 *ifehdr_end; 617 u8 *tlv_data; 618 u16 metalen; 619 620 spin_lock(&ife->tcf_lock); 621 bstats_update(&ife->tcf_bstats, skb); 622 tcf_lastuse_update(&ife->tcf_tm); 623 spin_unlock(&ife->tcf_lock); 624 625 if (skb_at_tc_ingress(skb)) 626 skb_push(skb, skb->dev->hard_header_len); 627 628 tlv_data = ife_decode(skb, &metalen); 629 if (unlikely(!tlv_data)) { 630 spin_lock(&ife->tcf_lock); 631 ife->tcf_qstats.drops++; 632 spin_unlock(&ife->tcf_lock); 633 return TC_ACT_SHOT; 634 } 635 636 ifehdr_end = tlv_data + metalen; 637 for (; tlv_data < ifehdr_end; tlv_data = ife_tlv_meta_next(tlv_data)) { 638 u8 *curr_data; 639 u16 mtype; 640 u16 dlen; 641 642 curr_data = ife_tlv_meta_decode(tlv_data, &mtype, &dlen, NULL); 643 644 if (find_decode_metaid(skb, ife, mtype, dlen, curr_data)) { 645 /* abuse overlimits to count when we receive metadata 646 * but dont have an ops for it 647 */ 648 pr_info_ratelimited("Unknown metaid %d dlen %d\n", 649 mtype, dlen); 650 ife->tcf_qstats.overlimits++; 651 } 652 } 653 654 if (WARN_ON(tlv_data != ifehdr_end)) { 655 spin_lock(&ife->tcf_lock); 656 ife->tcf_qstats.drops++; 657 spin_unlock(&ife->tcf_lock); 658 return TC_ACT_SHOT; 659 } 660 661 skb->protocol = eth_type_trans(skb, skb->dev); 662 skb_reset_network_header(skb); 663 664 return action; 665 } 666 667 /*XXX: check if we can do this at install time instead of current 668 * send data path 669 **/ 670 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife) 671 { 672 struct tcf_meta_info *e, *n; 673 int tot_run_sz = 0, run_sz = 0; 674 675 list_for_each_entry_safe(e, n, &ife->metalist, metalist) { 676 if (e->ops->check_presence) { 677 run_sz = e->ops->check_presence(skb, e); 678 tot_run_sz += run_sz; 679 } 680 } 681 682 return tot_run_sz; 683 } 684 685 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a, 686 struct tcf_result *res) 687 { 688 struct tcf_ife_info *ife = to_ife(a); 689 int action = ife->tcf_action; 690 struct ethhdr *oethh; /* outer ether header */ 691 struct tcf_meta_info *e; 692 /* 693 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA 694 where ORIGDATA = original ethernet header ... 695 */ 696 u16 metalen = ife_get_sz(skb, ife); 697 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN; 698 unsigned int skboff = 0; 699 int new_len = skb->len + hdrm; 700 bool exceed_mtu = false; 701 void *ife_meta; 702 int err = 0; 703 704 if (!skb_at_tc_ingress(skb)) { 705 if (new_len > skb->dev->mtu) 706 exceed_mtu = true; 707 } 708 709 spin_lock(&ife->tcf_lock); 710 bstats_update(&ife->tcf_bstats, skb); 711 tcf_lastuse_update(&ife->tcf_tm); 712 713 if (!metalen) { /* no metadata to send */ 714 /* abuse overlimits to count when we allow packet 715 * with no metadata 716 */ 717 ife->tcf_qstats.overlimits++; 718 spin_unlock(&ife->tcf_lock); 719 return action; 720 } 721 /* could be stupid policy setup or mtu config 722 * so lets be conservative.. */ 723 if ((action == TC_ACT_SHOT) || exceed_mtu) { 724 ife->tcf_qstats.drops++; 725 spin_unlock(&ife->tcf_lock); 726 return TC_ACT_SHOT; 727 } 728 729 if (skb_at_tc_ingress(skb)) 730 skb_push(skb, skb->dev->hard_header_len); 731 732 ife_meta = ife_encode(skb, metalen); 733 734 /* XXX: we dont have a clever way of telling encode to 735 * not repeat some of the computations that are done by 736 * ops->presence_check... 737 */ 738 list_for_each_entry(e, &ife->metalist, metalist) { 739 if (e->ops->encode) { 740 err = e->ops->encode(skb, (void *)(ife_meta + skboff), 741 e); 742 } 743 if (err < 0) { 744 /* too corrupt to keep around if overwritten */ 745 ife->tcf_qstats.drops++; 746 spin_unlock(&ife->tcf_lock); 747 return TC_ACT_SHOT; 748 } 749 skboff += err; 750 } 751 oethh = (struct ethhdr *)skb->data; 752 753 if (!is_zero_ether_addr(ife->eth_src)) 754 ether_addr_copy(oethh->h_source, ife->eth_src); 755 if (!is_zero_ether_addr(ife->eth_dst)) 756 ether_addr_copy(oethh->h_dest, ife->eth_dst); 757 oethh->h_proto = htons(ife->eth_type); 758 759 if (skb_at_tc_ingress(skb)) 760 skb_pull(skb, skb->dev->hard_header_len); 761 762 spin_unlock(&ife->tcf_lock); 763 764 return action; 765 } 766 767 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a, 768 struct tcf_result *res) 769 { 770 struct tcf_ife_info *ife = to_ife(a); 771 772 if (ife->flags & IFE_ENCODE) 773 return tcf_ife_encode(skb, a, res); 774 775 if (!(ife->flags & IFE_ENCODE)) 776 return tcf_ife_decode(skb, a, res); 777 778 pr_info_ratelimited("unknown failure(policy neither de/encode\n"); 779 spin_lock(&ife->tcf_lock); 780 bstats_update(&ife->tcf_bstats, skb); 781 tcf_lastuse_update(&ife->tcf_tm); 782 ife->tcf_qstats.drops++; 783 spin_unlock(&ife->tcf_lock); 784 785 return TC_ACT_SHOT; 786 } 787 788 static int tcf_ife_walker(struct net *net, struct sk_buff *skb, 789 struct netlink_callback *cb, int type, 790 const struct tc_action_ops *ops) 791 { 792 struct tc_action_net *tn = net_generic(net, ife_net_id); 793 794 return tcf_generic_walker(tn, skb, cb, type, ops); 795 } 796 797 static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index) 798 { 799 struct tc_action_net *tn = net_generic(net, ife_net_id); 800 801 return tcf_idr_search(tn, a, index); 802 } 803 804 static struct tc_action_ops act_ife_ops = { 805 .kind = "ife", 806 .type = TCA_ACT_IFE, 807 .owner = THIS_MODULE, 808 .act = tcf_ife_act, 809 .dump = tcf_ife_dump, 810 .cleanup = tcf_ife_cleanup, 811 .init = tcf_ife_init, 812 .walk = tcf_ife_walker, 813 .lookup = tcf_ife_search, 814 .size = sizeof(struct tcf_ife_info), 815 }; 816 817 static __net_init int ife_init_net(struct net *net) 818 { 819 struct tc_action_net *tn = net_generic(net, ife_net_id); 820 821 return tc_action_net_init(tn, &act_ife_ops); 822 } 823 824 static void __net_exit ife_exit_net(struct net *net) 825 { 826 struct tc_action_net *tn = net_generic(net, ife_net_id); 827 828 tc_action_net_exit(tn); 829 } 830 831 static struct pernet_operations ife_net_ops = { 832 .init = ife_init_net, 833 .exit = ife_exit_net, 834 .id = &ife_net_id, 835 .size = sizeof(struct tc_action_net), 836 }; 837 838 static int __init ife_init_module(void) 839 { 840 return tcf_register_action(&act_ife_ops, &ife_net_ops); 841 } 842 843 static void __exit ife_cleanup_module(void) 844 { 845 tcf_unregister_action(&act_ife_ops, &ife_net_ops); 846 } 847 848 module_init(ife_init_module); 849 module_exit(ife_cleanup_module); 850 851 MODULE_AUTHOR("Jamal Hadi Salim(2015)"); 852 MODULE_DESCRIPTION("Inter-FE LFB action"); 853 MODULE_LICENSE("GPL"); 854