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 static const char *ife_meta_id2name(u32 metaid) 252 { 253 switch (metaid) { 254 case IFE_META_SKBMARK: 255 return "skbmark"; 256 case IFE_META_PRIO: 257 return "skbprio"; 258 case IFE_META_TCINDEX: 259 return "tcindex"; 260 default: 261 return "unknown"; 262 } 263 } 264 265 /* called when adding new meta information 266 * under ife->tcf_lock for existing action 267 */ 268 static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid, 269 void *val, int len, bool exists) 270 { 271 struct tcf_meta_ops *ops = find_ife_oplist(metaid); 272 int ret = 0; 273 274 if (!ops) { 275 ret = -ENOENT; 276 #ifdef CONFIG_MODULES 277 if (exists) 278 spin_unlock_bh(&ife->tcf_lock); 279 rtnl_unlock(); 280 request_module("ife-meta-%s", ife_meta_id2name(metaid)); 281 rtnl_lock(); 282 if (exists) 283 spin_lock_bh(&ife->tcf_lock); 284 ops = find_ife_oplist(metaid); 285 #endif 286 } 287 288 if (ops) { 289 ret = 0; 290 if (len) 291 ret = ife_validate_metatype(ops, val, len); 292 293 module_put(ops->owner); 294 } 295 296 return ret; 297 } 298 299 /* called when adding new meta information 300 * under ife->tcf_lock for existing action 301 */ 302 static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval, 303 int len, bool atomic) 304 { 305 struct tcf_meta_info *mi = NULL; 306 struct tcf_meta_ops *ops = find_ife_oplist(metaid); 307 int ret = 0; 308 309 if (!ops) 310 return -ENOENT; 311 312 mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL); 313 if (!mi) { 314 /*put back what find_ife_oplist took */ 315 module_put(ops->owner); 316 return -ENOMEM; 317 } 318 319 mi->metaid = metaid; 320 mi->ops = ops; 321 if (len > 0) { 322 ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL); 323 if (ret != 0) { 324 kfree(mi); 325 module_put(ops->owner); 326 return ret; 327 } 328 } 329 330 list_add_tail(&mi->metalist, &ife->metalist); 331 332 return ret; 333 } 334 335 static int use_all_metadata(struct tcf_ife_info *ife) 336 { 337 struct tcf_meta_ops *o; 338 int rc = 0; 339 int installed = 0; 340 341 read_lock(&ife_mod_lock); 342 list_for_each_entry(o, &ifeoplist, list) { 343 rc = add_metainfo(ife, o->metaid, NULL, 0, true); 344 if (rc == 0) 345 installed += 1; 346 } 347 read_unlock(&ife_mod_lock); 348 349 if (installed) 350 return 0; 351 else 352 return -EINVAL; 353 } 354 355 static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife) 356 { 357 struct tcf_meta_info *e; 358 struct nlattr *nest; 359 unsigned char *b = skb_tail_pointer(skb); 360 int total_encoded = 0; 361 362 /*can only happen on decode */ 363 if (list_empty(&ife->metalist)) 364 return 0; 365 366 nest = nla_nest_start(skb, TCA_IFE_METALST); 367 if (!nest) 368 goto out_nlmsg_trim; 369 370 list_for_each_entry(e, &ife->metalist, metalist) { 371 if (!e->ops->get(skb, e)) 372 total_encoded += 1; 373 } 374 375 if (!total_encoded) 376 goto out_nlmsg_trim; 377 378 nla_nest_end(skb, nest); 379 380 return 0; 381 382 out_nlmsg_trim: 383 nlmsg_trim(skb, b); 384 return -1; 385 } 386 387 /* under ife->tcf_lock */ 388 static void _tcf_ife_cleanup(struct tc_action *a, int bind) 389 { 390 struct tcf_ife_info *ife = to_ife(a); 391 struct tcf_meta_info *e, *n; 392 393 list_for_each_entry_safe(e, n, &ife->metalist, metalist) { 394 module_put(e->ops->owner); 395 list_del(&e->metalist); 396 if (e->metaval) { 397 if (e->ops->release) 398 e->ops->release(e); 399 else 400 kfree(e->metaval); 401 } 402 kfree(e); 403 } 404 } 405 406 static void tcf_ife_cleanup(struct tc_action *a, int bind) 407 { 408 struct tcf_ife_info *ife = to_ife(a); 409 410 spin_lock_bh(&ife->tcf_lock); 411 _tcf_ife_cleanup(a, bind); 412 spin_unlock_bh(&ife->tcf_lock); 413 } 414 415 /* under ife->tcf_lock for existing action */ 416 static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb, 417 bool exists) 418 { 419 int len = 0; 420 int rc = 0; 421 int i = 0; 422 void *val; 423 424 for (i = 1; i < max_metacnt; i++) { 425 if (tb[i]) { 426 val = nla_data(tb[i]); 427 len = nla_len(tb[i]); 428 429 rc = load_metaops_and_vet(ife, i, val, len, exists); 430 if (rc != 0) 431 return rc; 432 433 rc = add_metainfo(ife, i, val, len, exists); 434 if (rc) 435 return rc; 436 } 437 } 438 439 return rc; 440 } 441 442 static int tcf_ife_init(struct net *net, struct nlattr *nla, 443 struct nlattr *est, struct tc_action **a, 444 int ovr, int bind) 445 { 446 struct tc_action_net *tn = net_generic(net, ife_net_id); 447 struct nlattr *tb[TCA_IFE_MAX + 1]; 448 struct nlattr *tb2[IFE_META_MAX + 1]; 449 struct tcf_ife_info *ife; 450 u16 ife_type = ETH_P_IFE; 451 struct tc_ife *parm; 452 u8 *daddr = NULL; 453 u8 *saddr = NULL; 454 bool exists = false; 455 int ret = 0; 456 int err; 457 458 err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy, NULL); 459 if (err < 0) 460 return err; 461 462 if (!tb[TCA_IFE_PARMS]) 463 return -EINVAL; 464 465 parm = nla_data(tb[TCA_IFE_PARMS]); 466 467 exists = tcf_idr_check(tn, parm->index, a, bind); 468 if (exists && bind) 469 return 0; 470 471 if (!exists) { 472 ret = tcf_idr_create(tn, parm->index, est, a, &act_ife_ops, 473 bind, false); 474 if (ret) 475 return ret; 476 ret = ACT_P_CREATED; 477 } else { 478 tcf_idr_release(*a, bind); 479 if (!ovr) 480 return -EEXIST; 481 } 482 483 ife = to_ife(*a); 484 ife->flags = parm->flags; 485 486 if (parm->flags & IFE_ENCODE) { 487 if (tb[TCA_IFE_TYPE]) 488 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]); 489 if (tb[TCA_IFE_DMAC]) 490 daddr = nla_data(tb[TCA_IFE_DMAC]); 491 if (tb[TCA_IFE_SMAC]) 492 saddr = nla_data(tb[TCA_IFE_SMAC]); 493 } 494 495 if (exists) 496 spin_lock_bh(&ife->tcf_lock); 497 ife->tcf_action = parm->action; 498 499 if (parm->flags & IFE_ENCODE) { 500 if (daddr) 501 ether_addr_copy(ife->eth_dst, daddr); 502 else 503 eth_zero_addr(ife->eth_dst); 504 505 if (saddr) 506 ether_addr_copy(ife->eth_src, saddr); 507 else 508 eth_zero_addr(ife->eth_src); 509 510 ife->eth_type = ife_type; 511 } 512 513 if (ret == ACT_P_CREATED) 514 INIT_LIST_HEAD(&ife->metalist); 515 516 if (tb[TCA_IFE_METALST]) { 517 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST], 518 NULL, NULL); 519 if (err) { 520 metadata_parse_err: 521 if (exists) 522 tcf_idr_release(*a, bind); 523 if (ret == ACT_P_CREATED) 524 _tcf_ife_cleanup(*a, bind); 525 526 if (exists) 527 spin_unlock_bh(&ife->tcf_lock); 528 return err; 529 } 530 531 err = populate_metalist(ife, tb2, exists); 532 if (err) 533 goto metadata_parse_err; 534 535 } else { 536 /* if no passed metadata allow list or passed allow-all 537 * then here we process by adding as many supported metadatum 538 * as we can. You better have at least one else we are 539 * going to bail out 540 */ 541 err = use_all_metadata(ife); 542 if (err) { 543 if (ret == ACT_P_CREATED) 544 _tcf_ife_cleanup(*a, bind); 545 546 if (exists) 547 spin_unlock_bh(&ife->tcf_lock); 548 return err; 549 } 550 } 551 552 if (exists) 553 spin_unlock_bh(&ife->tcf_lock); 554 555 if (ret == ACT_P_CREATED) 556 tcf_idr_insert(tn, *a); 557 558 return ret; 559 } 560 561 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind, 562 int ref) 563 { 564 unsigned char *b = skb_tail_pointer(skb); 565 struct tcf_ife_info *ife = to_ife(a); 566 struct tc_ife opt = { 567 .index = ife->tcf_index, 568 .refcnt = ife->tcf_refcnt - ref, 569 .bindcnt = ife->tcf_bindcnt - bind, 570 .action = ife->tcf_action, 571 .flags = ife->flags, 572 }; 573 struct tcf_t t; 574 575 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt)) 576 goto nla_put_failure; 577 578 tcf_tm_dump(&t, &ife->tcf_tm); 579 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD)) 580 goto nla_put_failure; 581 582 if (!is_zero_ether_addr(ife->eth_dst)) { 583 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst)) 584 goto nla_put_failure; 585 } 586 587 if (!is_zero_ether_addr(ife->eth_src)) { 588 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src)) 589 goto nla_put_failure; 590 } 591 592 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type)) 593 goto nla_put_failure; 594 595 if (dump_metalist(skb, ife)) { 596 /*ignore failure to dump metalist */ 597 pr_info("Failed to dump metalist\n"); 598 } 599 600 return skb->len; 601 602 nla_put_failure: 603 nlmsg_trim(skb, b); 604 return -1; 605 } 606 607 static int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife, 608 u16 metaid, u16 mlen, void *mdata) 609 { 610 struct tcf_meta_info *e; 611 612 /* XXX: use hash to speed up */ 613 list_for_each_entry(e, &ife->metalist, metalist) { 614 if (metaid == e->metaid) { 615 if (e->ops) { 616 /* We check for decode presence already */ 617 return e->ops->decode(skb, mdata, mlen); 618 } 619 } 620 } 621 622 return 0; 623 } 624 625 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a, 626 struct tcf_result *res) 627 { 628 struct tcf_ife_info *ife = to_ife(a); 629 int action = ife->tcf_action; 630 u8 *ifehdr_end; 631 u8 *tlv_data; 632 u16 metalen; 633 634 spin_lock(&ife->tcf_lock); 635 bstats_update(&ife->tcf_bstats, skb); 636 tcf_lastuse_update(&ife->tcf_tm); 637 spin_unlock(&ife->tcf_lock); 638 639 if (skb_at_tc_ingress(skb)) 640 skb_push(skb, skb->dev->hard_header_len); 641 642 tlv_data = ife_decode(skb, &metalen); 643 if (unlikely(!tlv_data)) { 644 spin_lock(&ife->tcf_lock); 645 ife->tcf_qstats.drops++; 646 spin_unlock(&ife->tcf_lock); 647 return TC_ACT_SHOT; 648 } 649 650 ifehdr_end = tlv_data + metalen; 651 for (; tlv_data < ifehdr_end; tlv_data = ife_tlv_meta_next(tlv_data)) { 652 u8 *curr_data; 653 u16 mtype; 654 u16 dlen; 655 656 curr_data = ife_tlv_meta_decode(tlv_data, &mtype, &dlen, NULL); 657 658 if (find_decode_metaid(skb, ife, mtype, dlen, curr_data)) { 659 /* abuse overlimits to count when we receive metadata 660 * but dont have an ops for it 661 */ 662 pr_info_ratelimited("Unknown metaid %d dlen %d\n", 663 mtype, dlen); 664 ife->tcf_qstats.overlimits++; 665 } 666 } 667 668 if (WARN_ON(tlv_data != ifehdr_end)) { 669 spin_lock(&ife->tcf_lock); 670 ife->tcf_qstats.drops++; 671 spin_unlock(&ife->tcf_lock); 672 return TC_ACT_SHOT; 673 } 674 675 skb->protocol = eth_type_trans(skb, skb->dev); 676 skb_reset_network_header(skb); 677 678 return action; 679 } 680 681 /*XXX: check if we can do this at install time instead of current 682 * send data path 683 **/ 684 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife) 685 { 686 struct tcf_meta_info *e, *n; 687 int tot_run_sz = 0, run_sz = 0; 688 689 list_for_each_entry_safe(e, n, &ife->metalist, metalist) { 690 if (e->ops->check_presence) { 691 run_sz = e->ops->check_presence(skb, e); 692 tot_run_sz += run_sz; 693 } 694 } 695 696 return tot_run_sz; 697 } 698 699 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a, 700 struct tcf_result *res) 701 { 702 struct tcf_ife_info *ife = to_ife(a); 703 int action = ife->tcf_action; 704 struct ethhdr *oethh; /* outer ether header */ 705 struct tcf_meta_info *e; 706 /* 707 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA 708 where ORIGDATA = original ethernet header ... 709 */ 710 u16 metalen = ife_get_sz(skb, ife); 711 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN; 712 unsigned int skboff = 0; 713 int new_len = skb->len + hdrm; 714 bool exceed_mtu = false; 715 void *ife_meta; 716 int err = 0; 717 718 if (!skb_at_tc_ingress(skb)) { 719 if (new_len > skb->dev->mtu) 720 exceed_mtu = true; 721 } 722 723 spin_lock(&ife->tcf_lock); 724 bstats_update(&ife->tcf_bstats, skb); 725 tcf_lastuse_update(&ife->tcf_tm); 726 727 if (!metalen) { /* no metadata to send */ 728 /* abuse overlimits to count when we allow packet 729 * with no metadata 730 */ 731 ife->tcf_qstats.overlimits++; 732 spin_unlock(&ife->tcf_lock); 733 return action; 734 } 735 /* could be stupid policy setup or mtu config 736 * so lets be conservative.. */ 737 if ((action == TC_ACT_SHOT) || exceed_mtu) { 738 ife->tcf_qstats.drops++; 739 spin_unlock(&ife->tcf_lock); 740 return TC_ACT_SHOT; 741 } 742 743 if (skb_at_tc_ingress(skb)) 744 skb_push(skb, skb->dev->hard_header_len); 745 746 ife_meta = ife_encode(skb, metalen); 747 748 /* XXX: we dont have a clever way of telling encode to 749 * not repeat some of the computations that are done by 750 * ops->presence_check... 751 */ 752 list_for_each_entry(e, &ife->metalist, metalist) { 753 if (e->ops->encode) { 754 err = e->ops->encode(skb, (void *)(ife_meta + skboff), 755 e); 756 } 757 if (err < 0) { 758 /* too corrupt to keep around if overwritten */ 759 ife->tcf_qstats.drops++; 760 spin_unlock(&ife->tcf_lock); 761 return TC_ACT_SHOT; 762 } 763 skboff += err; 764 } 765 oethh = (struct ethhdr *)skb->data; 766 767 if (!is_zero_ether_addr(ife->eth_src)) 768 ether_addr_copy(oethh->h_source, ife->eth_src); 769 if (!is_zero_ether_addr(ife->eth_dst)) 770 ether_addr_copy(oethh->h_dest, ife->eth_dst); 771 oethh->h_proto = htons(ife->eth_type); 772 773 if (skb_at_tc_ingress(skb)) 774 skb_pull(skb, skb->dev->hard_header_len); 775 776 spin_unlock(&ife->tcf_lock); 777 778 return action; 779 } 780 781 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a, 782 struct tcf_result *res) 783 { 784 struct tcf_ife_info *ife = to_ife(a); 785 786 if (ife->flags & IFE_ENCODE) 787 return tcf_ife_encode(skb, a, res); 788 789 if (!(ife->flags & IFE_ENCODE)) 790 return tcf_ife_decode(skb, a, res); 791 792 pr_info_ratelimited("unknown failure(policy neither de/encode\n"); 793 spin_lock(&ife->tcf_lock); 794 bstats_update(&ife->tcf_bstats, skb); 795 tcf_lastuse_update(&ife->tcf_tm); 796 ife->tcf_qstats.drops++; 797 spin_unlock(&ife->tcf_lock); 798 799 return TC_ACT_SHOT; 800 } 801 802 static int tcf_ife_walker(struct net *net, struct sk_buff *skb, 803 struct netlink_callback *cb, int type, 804 const struct tc_action_ops *ops) 805 { 806 struct tc_action_net *tn = net_generic(net, ife_net_id); 807 808 return tcf_generic_walker(tn, skb, cb, type, ops); 809 } 810 811 static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index) 812 { 813 struct tc_action_net *tn = net_generic(net, ife_net_id); 814 815 return tcf_idr_search(tn, a, index); 816 } 817 818 static struct tc_action_ops act_ife_ops = { 819 .kind = "ife", 820 .type = TCA_ACT_IFE, 821 .owner = THIS_MODULE, 822 .act = tcf_ife_act, 823 .dump = tcf_ife_dump, 824 .cleanup = tcf_ife_cleanup, 825 .init = tcf_ife_init, 826 .walk = tcf_ife_walker, 827 .lookup = tcf_ife_search, 828 .size = sizeof(struct tcf_ife_info), 829 }; 830 831 static __net_init int ife_init_net(struct net *net) 832 { 833 struct tc_action_net *tn = net_generic(net, ife_net_id); 834 835 return tc_action_net_init(tn, &act_ife_ops); 836 } 837 838 static void __net_exit ife_exit_net(struct net *net) 839 { 840 struct tc_action_net *tn = net_generic(net, ife_net_id); 841 842 tc_action_net_exit(tn); 843 } 844 845 static struct pernet_operations ife_net_ops = { 846 .init = ife_init_net, 847 .exit = ife_exit_net, 848 .id = &ife_net_id, 849 .size = sizeof(struct tc_action_net), 850 }; 851 852 static int __init ife_init_module(void) 853 { 854 return tcf_register_action(&act_ife_ops, &ife_net_ops); 855 } 856 857 static void __exit ife_cleanup_module(void) 858 { 859 tcf_unregister_action(&act_ife_ops, &ife_net_ops); 860 } 861 862 module_init(ife_init_module); 863 module_exit(ife_cleanup_module); 864 865 MODULE_AUTHOR("Jamal Hadi Salim(2015)"); 866 MODULE_DESCRIPTION("Inter-FE LFB action"); 867 MODULE_LICENSE("GPL"); 868