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 /* IFE_DECODE is 0 and indicates the opposite of IFE_ENCODE because 468 * they cannot run as the same time. Check on all other values which 469 * are not supported right now. 470 */ 471 if (parm->flags & ~IFE_ENCODE) 472 return -EINVAL; 473 474 exists = tcf_idr_check(tn, parm->index, a, bind); 475 if (exists && bind) 476 return 0; 477 478 if (!exists) { 479 ret = tcf_idr_create(tn, parm->index, est, a, &act_ife_ops, 480 bind, false); 481 if (ret) 482 return ret; 483 ret = ACT_P_CREATED; 484 } else { 485 tcf_idr_release(*a, bind); 486 if (!ovr) 487 return -EEXIST; 488 } 489 490 ife = to_ife(*a); 491 ife->flags = parm->flags; 492 493 if (parm->flags & IFE_ENCODE) { 494 if (tb[TCA_IFE_TYPE]) 495 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]); 496 if (tb[TCA_IFE_DMAC]) 497 daddr = nla_data(tb[TCA_IFE_DMAC]); 498 if (tb[TCA_IFE_SMAC]) 499 saddr = nla_data(tb[TCA_IFE_SMAC]); 500 } 501 502 if (exists) 503 spin_lock_bh(&ife->tcf_lock); 504 ife->tcf_action = parm->action; 505 506 if (parm->flags & IFE_ENCODE) { 507 if (daddr) 508 ether_addr_copy(ife->eth_dst, daddr); 509 else 510 eth_zero_addr(ife->eth_dst); 511 512 if (saddr) 513 ether_addr_copy(ife->eth_src, saddr); 514 else 515 eth_zero_addr(ife->eth_src); 516 517 ife->eth_type = ife_type; 518 } 519 520 if (ret == ACT_P_CREATED) 521 INIT_LIST_HEAD(&ife->metalist); 522 523 if (tb[TCA_IFE_METALST]) { 524 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST], 525 NULL, NULL); 526 if (err) { 527 metadata_parse_err: 528 if (exists) 529 tcf_idr_release(*a, bind); 530 if (ret == ACT_P_CREATED) 531 _tcf_ife_cleanup(*a, bind); 532 533 if (exists) 534 spin_unlock_bh(&ife->tcf_lock); 535 return err; 536 } 537 538 err = populate_metalist(ife, tb2, exists); 539 if (err) 540 goto metadata_parse_err; 541 542 } else { 543 /* if no passed metadata allow list or passed allow-all 544 * then here we process by adding as many supported metadatum 545 * as we can. You better have at least one else we are 546 * going to bail out 547 */ 548 err = use_all_metadata(ife); 549 if (err) { 550 if (ret == ACT_P_CREATED) 551 _tcf_ife_cleanup(*a, bind); 552 553 if (exists) 554 spin_unlock_bh(&ife->tcf_lock); 555 return err; 556 } 557 } 558 559 if (exists) 560 spin_unlock_bh(&ife->tcf_lock); 561 562 if (ret == ACT_P_CREATED) 563 tcf_idr_insert(tn, *a); 564 565 return ret; 566 } 567 568 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind, 569 int ref) 570 { 571 unsigned char *b = skb_tail_pointer(skb); 572 struct tcf_ife_info *ife = to_ife(a); 573 struct tc_ife opt = { 574 .index = ife->tcf_index, 575 .refcnt = ife->tcf_refcnt - ref, 576 .bindcnt = ife->tcf_bindcnt - bind, 577 .action = ife->tcf_action, 578 .flags = ife->flags, 579 }; 580 struct tcf_t t; 581 582 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt)) 583 goto nla_put_failure; 584 585 tcf_tm_dump(&t, &ife->tcf_tm); 586 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD)) 587 goto nla_put_failure; 588 589 if (!is_zero_ether_addr(ife->eth_dst)) { 590 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst)) 591 goto nla_put_failure; 592 } 593 594 if (!is_zero_ether_addr(ife->eth_src)) { 595 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src)) 596 goto nla_put_failure; 597 } 598 599 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type)) 600 goto nla_put_failure; 601 602 if (dump_metalist(skb, ife)) { 603 /*ignore failure to dump metalist */ 604 pr_info("Failed to dump metalist\n"); 605 } 606 607 return skb->len; 608 609 nla_put_failure: 610 nlmsg_trim(skb, b); 611 return -1; 612 } 613 614 static int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife, 615 u16 metaid, u16 mlen, void *mdata) 616 { 617 struct tcf_meta_info *e; 618 619 /* XXX: use hash to speed up */ 620 list_for_each_entry(e, &ife->metalist, metalist) { 621 if (metaid == e->metaid) { 622 if (e->ops) { 623 /* We check for decode presence already */ 624 return e->ops->decode(skb, mdata, mlen); 625 } 626 } 627 } 628 629 return 0; 630 } 631 632 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a, 633 struct tcf_result *res) 634 { 635 struct tcf_ife_info *ife = to_ife(a); 636 int action = ife->tcf_action; 637 u8 *ifehdr_end; 638 u8 *tlv_data; 639 u16 metalen; 640 641 spin_lock(&ife->tcf_lock); 642 bstats_update(&ife->tcf_bstats, skb); 643 tcf_lastuse_update(&ife->tcf_tm); 644 spin_unlock(&ife->tcf_lock); 645 646 if (skb_at_tc_ingress(skb)) 647 skb_push(skb, skb->dev->hard_header_len); 648 649 tlv_data = ife_decode(skb, &metalen); 650 if (unlikely(!tlv_data)) { 651 spin_lock(&ife->tcf_lock); 652 ife->tcf_qstats.drops++; 653 spin_unlock(&ife->tcf_lock); 654 return TC_ACT_SHOT; 655 } 656 657 ifehdr_end = tlv_data + metalen; 658 for (; tlv_data < ifehdr_end; tlv_data = ife_tlv_meta_next(tlv_data)) { 659 u8 *curr_data; 660 u16 mtype; 661 u16 dlen; 662 663 curr_data = ife_tlv_meta_decode(tlv_data, &mtype, &dlen, NULL); 664 665 if (find_decode_metaid(skb, ife, mtype, dlen, curr_data)) { 666 /* abuse overlimits to count when we receive metadata 667 * but dont have an ops for it 668 */ 669 pr_info_ratelimited("Unknown metaid %d dlen %d\n", 670 mtype, dlen); 671 ife->tcf_qstats.overlimits++; 672 } 673 } 674 675 if (WARN_ON(tlv_data != ifehdr_end)) { 676 spin_lock(&ife->tcf_lock); 677 ife->tcf_qstats.drops++; 678 spin_unlock(&ife->tcf_lock); 679 return TC_ACT_SHOT; 680 } 681 682 skb->protocol = eth_type_trans(skb, skb->dev); 683 skb_reset_network_header(skb); 684 685 return action; 686 } 687 688 /*XXX: check if we can do this at install time instead of current 689 * send data path 690 **/ 691 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife) 692 { 693 struct tcf_meta_info *e, *n; 694 int tot_run_sz = 0, run_sz = 0; 695 696 list_for_each_entry_safe(e, n, &ife->metalist, metalist) { 697 if (e->ops->check_presence) { 698 run_sz = e->ops->check_presence(skb, e); 699 tot_run_sz += run_sz; 700 } 701 } 702 703 return tot_run_sz; 704 } 705 706 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a, 707 struct tcf_result *res) 708 { 709 struct tcf_ife_info *ife = to_ife(a); 710 int action = ife->tcf_action; 711 struct ethhdr *oethh; /* outer ether header */ 712 struct tcf_meta_info *e; 713 /* 714 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA 715 where ORIGDATA = original ethernet header ... 716 */ 717 u16 metalen = ife_get_sz(skb, ife); 718 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN; 719 unsigned int skboff = 0; 720 int new_len = skb->len + hdrm; 721 bool exceed_mtu = false; 722 void *ife_meta; 723 int err = 0; 724 725 if (!skb_at_tc_ingress(skb)) { 726 if (new_len > skb->dev->mtu) 727 exceed_mtu = true; 728 } 729 730 spin_lock(&ife->tcf_lock); 731 bstats_update(&ife->tcf_bstats, skb); 732 tcf_lastuse_update(&ife->tcf_tm); 733 734 if (!metalen) { /* no metadata to send */ 735 /* abuse overlimits to count when we allow packet 736 * with no metadata 737 */ 738 ife->tcf_qstats.overlimits++; 739 spin_unlock(&ife->tcf_lock); 740 return action; 741 } 742 /* could be stupid policy setup or mtu config 743 * so lets be conservative.. */ 744 if ((action == TC_ACT_SHOT) || exceed_mtu) { 745 ife->tcf_qstats.drops++; 746 spin_unlock(&ife->tcf_lock); 747 return TC_ACT_SHOT; 748 } 749 750 if (skb_at_tc_ingress(skb)) 751 skb_push(skb, skb->dev->hard_header_len); 752 753 ife_meta = ife_encode(skb, metalen); 754 755 /* XXX: we dont have a clever way of telling encode to 756 * not repeat some of the computations that are done by 757 * ops->presence_check... 758 */ 759 list_for_each_entry(e, &ife->metalist, metalist) { 760 if (e->ops->encode) { 761 err = e->ops->encode(skb, (void *)(ife_meta + skboff), 762 e); 763 } 764 if (err < 0) { 765 /* too corrupt to keep around if overwritten */ 766 ife->tcf_qstats.drops++; 767 spin_unlock(&ife->tcf_lock); 768 return TC_ACT_SHOT; 769 } 770 skboff += err; 771 } 772 oethh = (struct ethhdr *)skb->data; 773 774 if (!is_zero_ether_addr(ife->eth_src)) 775 ether_addr_copy(oethh->h_source, ife->eth_src); 776 if (!is_zero_ether_addr(ife->eth_dst)) 777 ether_addr_copy(oethh->h_dest, ife->eth_dst); 778 oethh->h_proto = htons(ife->eth_type); 779 780 if (skb_at_tc_ingress(skb)) 781 skb_pull(skb, skb->dev->hard_header_len); 782 783 spin_unlock(&ife->tcf_lock); 784 785 return action; 786 } 787 788 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a, 789 struct tcf_result *res) 790 { 791 struct tcf_ife_info *ife = to_ife(a); 792 793 if (ife->flags & IFE_ENCODE) 794 return tcf_ife_encode(skb, a, res); 795 796 return tcf_ife_decode(skb, a, res); 797 } 798 799 static int tcf_ife_walker(struct net *net, struct sk_buff *skb, 800 struct netlink_callback *cb, int type, 801 const struct tc_action_ops *ops) 802 { 803 struct tc_action_net *tn = net_generic(net, ife_net_id); 804 805 return tcf_generic_walker(tn, skb, cb, type, ops); 806 } 807 808 static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index) 809 { 810 struct tc_action_net *tn = net_generic(net, ife_net_id); 811 812 return tcf_idr_search(tn, a, index); 813 } 814 815 static struct tc_action_ops act_ife_ops = { 816 .kind = "ife", 817 .type = TCA_ACT_IFE, 818 .owner = THIS_MODULE, 819 .act = tcf_ife_act, 820 .dump = tcf_ife_dump, 821 .cleanup = tcf_ife_cleanup, 822 .init = tcf_ife_init, 823 .walk = tcf_ife_walker, 824 .lookup = tcf_ife_search, 825 .size = sizeof(struct tcf_ife_info), 826 }; 827 828 static __net_init int ife_init_net(struct net *net) 829 { 830 struct tc_action_net *tn = net_generic(net, ife_net_id); 831 832 return tc_action_net_init(tn, &act_ife_ops); 833 } 834 835 static void __net_exit ife_exit_net(struct net *net) 836 { 837 struct tc_action_net *tn = net_generic(net, ife_net_id); 838 839 tc_action_net_exit(tn); 840 } 841 842 static struct pernet_operations ife_net_ops = { 843 .init = ife_init_net, 844 .exit = ife_exit_net, 845 .id = &ife_net_id, 846 .size = sizeof(struct tc_action_net), 847 }; 848 849 static int __init ife_init_module(void) 850 { 851 return tcf_register_action(&act_ife_ops, &ife_net_ops); 852 } 853 854 static void __exit ife_cleanup_module(void) 855 { 856 tcf_unregister_action(&act_ife_ops, &ife_net_ops); 857 } 858 859 module_init(ife_init_module); 860 module_exit(ife_cleanup_module); 861 862 MODULE_AUTHOR("Jamal Hadi Salim(2015)"); 863 MODULE_DESCRIPTION("Inter-FE LFB action"); 864 MODULE_LICENSE("GPL"); 865