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 36 #define IFE_TAB_MASK 15 37 38 static int ife_net_id; 39 static int max_metacnt = IFE_META_MAX + 1; 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 /* Caller takes care of presenting data in network order 49 */ 50 int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval) 51 { 52 u32 *tlv = (u32 *)(skbdata); 53 u16 totlen = nla_total_size(dlen); /*alignment + hdr */ 54 char *dptr = (char *)tlv + NLA_HDRLEN; 55 u32 htlv = attrtype << 16 | totlen; 56 57 *tlv = htonl(htlv); 58 memset(dptr, 0, totlen - NLA_HDRLEN); 59 memcpy(dptr, dval, dlen); 60 61 return totlen; 62 } 63 EXPORT_SYMBOL_GPL(ife_tlv_meta_encode); 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_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi) 84 { 85 u32 edata = metaval; 86 87 if (mi->metaval) 88 edata = *(u32 *)mi->metaval; 89 else if (metaval) 90 edata = metaval; 91 92 if (!edata) /* will not encode */ 93 return 0; 94 95 edata = htonl(edata); 96 return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata); 97 } 98 EXPORT_SYMBOL_GPL(ife_encode_meta_u32); 99 100 int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi) 101 { 102 if (mi->metaval) 103 return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval); 104 else 105 return nla_put(skb, mi->metaid, 0, NULL); 106 } 107 EXPORT_SYMBOL_GPL(ife_get_meta_u16); 108 109 int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval) 110 { 111 mi->metaval = kmemdup(metaval, sizeof(u32), GFP_KERNEL); 112 if (!mi->metaval) 113 return -ENOMEM; 114 115 return 0; 116 } 117 EXPORT_SYMBOL_GPL(ife_alloc_meta_u32); 118 119 int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval) 120 { 121 mi->metaval = kmemdup(metaval, sizeof(u16), GFP_KERNEL); 122 if (!mi->metaval) 123 return -ENOMEM; 124 125 return 0; 126 } 127 EXPORT_SYMBOL_GPL(ife_alloc_meta_u16); 128 129 void ife_release_meta_gen(struct tcf_meta_info *mi) 130 { 131 kfree(mi->metaval); 132 } 133 EXPORT_SYMBOL_GPL(ife_release_meta_gen); 134 135 int ife_validate_meta_u32(void *val, int len) 136 { 137 if (len == 4) 138 return 0; 139 140 return -EINVAL; 141 } 142 EXPORT_SYMBOL_GPL(ife_validate_meta_u32); 143 144 int ife_validate_meta_u16(void *val, int len) 145 { 146 /* length will include padding */ 147 if (len == NLA_ALIGN(2)) 148 return 0; 149 150 return -EINVAL; 151 } 152 EXPORT_SYMBOL_GPL(ife_validate_meta_u16); 153 154 static LIST_HEAD(ifeoplist); 155 static DEFINE_RWLOCK(ife_mod_lock); 156 157 static struct tcf_meta_ops *find_ife_oplist(u16 metaid) 158 { 159 struct tcf_meta_ops *o; 160 161 read_lock(&ife_mod_lock); 162 list_for_each_entry(o, &ifeoplist, list) { 163 if (o->metaid == metaid) { 164 if (!try_module_get(o->owner)) 165 o = NULL; 166 read_unlock(&ife_mod_lock); 167 return o; 168 } 169 } 170 read_unlock(&ife_mod_lock); 171 172 return NULL; 173 } 174 175 int register_ife_op(struct tcf_meta_ops *mops) 176 { 177 struct tcf_meta_ops *m; 178 179 if (!mops->metaid || !mops->metatype || !mops->name || 180 !mops->check_presence || !mops->encode || !mops->decode || 181 !mops->get || !mops->alloc) 182 return -EINVAL; 183 184 write_lock(&ife_mod_lock); 185 186 list_for_each_entry(m, &ifeoplist, list) { 187 if (m->metaid == mops->metaid || 188 (strcmp(mops->name, m->name) == 0)) { 189 write_unlock(&ife_mod_lock); 190 return -EEXIST; 191 } 192 } 193 194 if (!mops->release) 195 mops->release = ife_release_meta_gen; 196 197 list_add_tail(&mops->list, &ifeoplist); 198 write_unlock(&ife_mod_lock); 199 return 0; 200 } 201 EXPORT_SYMBOL_GPL(unregister_ife_op); 202 203 int unregister_ife_op(struct tcf_meta_ops *mops) 204 { 205 struct tcf_meta_ops *m; 206 int err = -ENOENT; 207 208 write_lock(&ife_mod_lock); 209 list_for_each_entry(m, &ifeoplist, list) { 210 if (m->metaid == mops->metaid) { 211 list_del(&mops->list); 212 err = 0; 213 break; 214 } 215 } 216 write_unlock(&ife_mod_lock); 217 218 return err; 219 } 220 EXPORT_SYMBOL_GPL(register_ife_op); 221 222 static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len) 223 { 224 int ret = 0; 225 /* XXX: unfortunately cant use nla_policy at this point 226 * because a length of 0 is valid in the case of 227 * "allow". "use" semantics do enforce for proper 228 * length and i couldve use nla_policy but it makes it hard 229 * to use it just for that.. 230 */ 231 if (ops->validate) 232 return ops->validate(val, len); 233 234 if (ops->metatype == NLA_U32) 235 ret = ife_validate_meta_u32(val, len); 236 else if (ops->metatype == NLA_U16) 237 ret = ife_validate_meta_u16(val, len); 238 239 return ret; 240 } 241 242 /* called when adding new meta information 243 * under ife->tcf_lock 244 */ 245 static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid, 246 void *val, int len) 247 { 248 struct tcf_meta_ops *ops = find_ife_oplist(metaid); 249 int ret = 0; 250 251 if (!ops) { 252 ret = -ENOENT; 253 #ifdef CONFIG_MODULES 254 spin_unlock_bh(&ife->tcf_lock); 255 rtnl_unlock(); 256 request_module("ifemeta%u", metaid); 257 rtnl_lock(); 258 spin_lock_bh(&ife->tcf_lock); 259 ops = find_ife_oplist(metaid); 260 #endif 261 } 262 263 if (ops) { 264 ret = 0; 265 if (len) 266 ret = ife_validate_metatype(ops, val, len); 267 268 module_put(ops->owner); 269 } 270 271 return ret; 272 } 273 274 /* called when adding new meta information 275 * under ife->tcf_lock 276 */ 277 static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval, 278 int len) 279 { 280 struct tcf_meta_info *mi = NULL; 281 struct tcf_meta_ops *ops = find_ife_oplist(metaid); 282 int ret = 0; 283 284 if (!ops) 285 return -ENOENT; 286 287 mi = kzalloc(sizeof(*mi), GFP_KERNEL); 288 if (!mi) { 289 /*put back what find_ife_oplist took */ 290 module_put(ops->owner); 291 return -ENOMEM; 292 } 293 294 mi->metaid = metaid; 295 mi->ops = ops; 296 if (len > 0) { 297 ret = ops->alloc(mi, metaval); 298 if (ret != 0) { 299 kfree(mi); 300 module_put(ops->owner); 301 return ret; 302 } 303 } 304 305 list_add_tail(&mi->metalist, &ife->metalist); 306 307 return ret; 308 } 309 310 static int use_all_metadata(struct tcf_ife_info *ife) 311 { 312 struct tcf_meta_ops *o; 313 int rc = 0; 314 int installed = 0; 315 316 list_for_each_entry(o, &ifeoplist, list) { 317 rc = add_metainfo(ife, o->metaid, NULL, 0); 318 if (rc == 0) 319 installed += 1; 320 } 321 322 if (installed) 323 return 0; 324 else 325 return -EINVAL; 326 } 327 328 static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife) 329 { 330 struct tcf_meta_info *e; 331 struct nlattr *nest; 332 unsigned char *b = skb_tail_pointer(skb); 333 int total_encoded = 0; 334 335 /*can only happen on decode */ 336 if (list_empty(&ife->metalist)) 337 return 0; 338 339 nest = nla_nest_start(skb, TCA_IFE_METALST); 340 if (!nest) 341 goto out_nlmsg_trim; 342 343 list_for_each_entry(e, &ife->metalist, metalist) { 344 if (!e->ops->get(skb, e)) 345 total_encoded += 1; 346 } 347 348 if (!total_encoded) 349 goto out_nlmsg_trim; 350 351 nla_nest_end(skb, nest); 352 353 return 0; 354 355 out_nlmsg_trim: 356 nlmsg_trim(skb, b); 357 return -1; 358 } 359 360 /* under ife->tcf_lock */ 361 static void _tcf_ife_cleanup(struct tc_action *a, int bind) 362 { 363 struct tcf_ife_info *ife = a->priv; 364 struct tcf_meta_info *e, *n; 365 366 list_for_each_entry_safe(e, n, &ife->metalist, metalist) { 367 module_put(e->ops->owner); 368 list_del(&e->metalist); 369 if (e->metaval) { 370 if (e->ops->release) 371 e->ops->release(e); 372 else 373 kfree(e->metaval); 374 } 375 kfree(e); 376 } 377 } 378 379 static void tcf_ife_cleanup(struct tc_action *a, int bind) 380 { 381 struct tcf_ife_info *ife = a->priv; 382 383 spin_lock_bh(&ife->tcf_lock); 384 _tcf_ife_cleanup(a, bind); 385 spin_unlock_bh(&ife->tcf_lock); 386 } 387 388 /* under ife->tcf_lock */ 389 static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb) 390 { 391 int len = 0; 392 int rc = 0; 393 int i = 0; 394 void *val; 395 396 for (i = 1; i < max_metacnt; i++) { 397 if (tb[i]) { 398 val = nla_data(tb[i]); 399 len = nla_len(tb[i]); 400 401 rc = load_metaops_and_vet(ife, i, val, len); 402 if (rc != 0) 403 return rc; 404 405 rc = add_metainfo(ife, i, val, len); 406 if (rc) 407 return rc; 408 } 409 } 410 411 return rc; 412 } 413 414 static int tcf_ife_init(struct net *net, struct nlattr *nla, 415 struct nlattr *est, struct tc_action *a, 416 int ovr, int bind) 417 { 418 struct tc_action_net *tn = net_generic(net, ife_net_id); 419 struct nlattr *tb[TCA_IFE_MAX + 1]; 420 struct nlattr *tb2[IFE_META_MAX + 1]; 421 struct tcf_ife_info *ife; 422 struct tc_ife *parm; 423 u16 ife_type = 0; 424 u8 *daddr = NULL; 425 u8 *saddr = NULL; 426 int ret = 0, exists = 0; 427 int err; 428 429 err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy); 430 if (err < 0) 431 return err; 432 433 if (!tb[TCA_IFE_PARMS]) 434 return -EINVAL; 435 436 parm = nla_data(tb[TCA_IFE_PARMS]); 437 438 exists = tcf_hash_check(tn, parm->index, a, bind); 439 if (exists && bind) 440 return 0; 441 442 if (parm->flags & IFE_ENCODE) { 443 /* Until we get issued the ethertype, we cant have 444 * a default.. 445 **/ 446 if (!tb[TCA_IFE_TYPE]) { 447 if (exists) 448 tcf_hash_release(a, bind); 449 pr_info("You MUST pass etherype for encoding\n"); 450 return -EINVAL; 451 } 452 } 453 454 if (!exists) { 455 ret = tcf_hash_create(tn, parm->index, est, a, sizeof(*ife), 456 bind, false); 457 if (ret) 458 return ret; 459 ret = ACT_P_CREATED; 460 } else { 461 tcf_hash_release(a, bind); 462 if (!ovr) 463 return -EEXIST; 464 } 465 466 ife = to_ife(a); 467 ife->flags = parm->flags; 468 469 if (parm->flags & IFE_ENCODE) { 470 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]); 471 if (tb[TCA_IFE_DMAC]) 472 daddr = nla_data(tb[TCA_IFE_DMAC]); 473 if (tb[TCA_IFE_SMAC]) 474 saddr = nla_data(tb[TCA_IFE_SMAC]); 475 } 476 477 spin_lock_bh(&ife->tcf_lock); 478 ife->tcf_action = parm->action; 479 480 if (parm->flags & IFE_ENCODE) { 481 if (daddr) 482 ether_addr_copy(ife->eth_dst, daddr); 483 else 484 eth_zero_addr(ife->eth_dst); 485 486 if (saddr) 487 ether_addr_copy(ife->eth_src, saddr); 488 else 489 eth_zero_addr(ife->eth_src); 490 491 ife->eth_type = ife_type; 492 } 493 494 if (ret == ACT_P_CREATED) 495 INIT_LIST_HEAD(&ife->metalist); 496 497 if (tb[TCA_IFE_METALST]) { 498 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST], 499 NULL); 500 if (err) { 501 metadata_parse_err: 502 if (exists) 503 tcf_hash_release(a, bind); 504 if (ret == ACT_P_CREATED) 505 _tcf_ife_cleanup(a, bind); 506 507 spin_unlock_bh(&ife->tcf_lock); 508 return err; 509 } 510 511 err = populate_metalist(ife, tb2); 512 if (err) 513 goto metadata_parse_err; 514 515 } else { 516 /* if no passed metadata allow list or passed allow-all 517 * then here we process by adding as many supported metadatum 518 * as we can. You better have at least one else we are 519 * going to bail out 520 */ 521 err = use_all_metadata(ife); 522 if (err) { 523 if (ret == ACT_P_CREATED) 524 _tcf_ife_cleanup(a, bind); 525 526 spin_unlock_bh(&ife->tcf_lock); 527 return err; 528 } 529 } 530 531 spin_unlock_bh(&ife->tcf_lock); 532 533 if (ret == ACT_P_CREATED) 534 tcf_hash_insert(tn, a); 535 536 return ret; 537 } 538 539 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind, 540 int ref) 541 { 542 unsigned char *b = skb_tail_pointer(skb); 543 struct tcf_ife_info *ife = a->priv; 544 struct tc_ife opt = { 545 .index = ife->tcf_index, 546 .refcnt = ife->tcf_refcnt - ref, 547 .bindcnt = ife->tcf_bindcnt - bind, 548 .action = ife->tcf_action, 549 .flags = ife->flags, 550 }; 551 struct tcf_t t; 552 553 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt)) 554 goto nla_put_failure; 555 556 tcf_tm_dump(&t, &ife->tcf_tm); 557 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD)) 558 goto nla_put_failure; 559 560 if (!is_zero_ether_addr(ife->eth_dst)) { 561 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst)) 562 goto nla_put_failure; 563 } 564 565 if (!is_zero_ether_addr(ife->eth_src)) { 566 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src)) 567 goto nla_put_failure; 568 } 569 570 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type)) 571 goto nla_put_failure; 572 573 if (dump_metalist(skb, ife)) { 574 /*ignore failure to dump metalist */ 575 pr_info("Failed to dump metalist\n"); 576 } 577 578 return skb->len; 579 580 nla_put_failure: 581 nlmsg_trim(skb, b); 582 return -1; 583 } 584 585 int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife, 586 u16 metaid, u16 mlen, void *mdata) 587 { 588 struct tcf_meta_info *e; 589 590 /* XXX: use hash to speed up */ 591 list_for_each_entry(e, &ife->metalist, metalist) { 592 if (metaid == e->metaid) { 593 if (e->ops) { 594 /* We check for decode presence already */ 595 return e->ops->decode(skb, mdata, mlen); 596 } 597 } 598 } 599 600 return 0; 601 } 602 603 struct ifeheadr { 604 __be16 metalen; 605 u8 tlv_data[]; 606 }; 607 608 struct meta_tlvhdr { 609 __be16 type; 610 __be16 len; 611 }; 612 613 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a, 614 struct tcf_result *res) 615 { 616 struct tcf_ife_info *ife = a->priv; 617 int action = ife->tcf_action; 618 struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data; 619 u16 ifehdrln = ifehdr->metalen; 620 struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data); 621 622 spin_lock(&ife->tcf_lock); 623 bstats_update(&ife->tcf_bstats, skb); 624 tcf_lastuse_update(&ife->tcf_tm); 625 spin_unlock(&ife->tcf_lock); 626 627 ifehdrln = ntohs(ifehdrln); 628 if (unlikely(!pskb_may_pull(skb, ifehdrln))) { 629 spin_lock(&ife->tcf_lock); 630 ife->tcf_qstats.drops++; 631 spin_unlock(&ife->tcf_lock); 632 return TC_ACT_SHOT; 633 } 634 635 skb_set_mac_header(skb, ifehdrln); 636 __skb_pull(skb, ifehdrln); 637 skb->protocol = eth_type_trans(skb, skb->dev); 638 ifehdrln -= IFE_METAHDRLEN; 639 640 while (ifehdrln > 0) { 641 u8 *tlvdata = (u8 *)tlv; 642 u16 mtype = tlv->type; 643 u16 mlen = tlv->len; 644 645 mtype = ntohs(mtype); 646 mlen = ntohs(mlen); 647 648 if (find_decode_metaid(skb, ife, mtype, (mlen - 4), 649 (void *)(tlvdata + 4))) { 650 /* abuse overlimits to count when we receive metadata 651 * but dont have an ops for it 652 */ 653 pr_info_ratelimited("Unknown metaid %d alnlen %d\n", 654 mtype, mlen); 655 ife->tcf_qstats.overlimits++; 656 } 657 658 tlvdata += mlen; 659 ifehdrln -= mlen; 660 tlv = (struct meta_tlvhdr *)tlvdata; 661 } 662 663 skb_reset_network_header(skb); 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 = a->priv; 689 int action = ife->tcf_action; 690 struct ethhdr *oethh; /* outer ether header */ 691 struct ethhdr *iethh; /* inner eth header */ 692 struct tcf_meta_info *e; 693 /* 694 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA 695 where ORIGDATA = original ethernet header ... 696 */ 697 u16 metalen = ife_get_sz(skb, ife); 698 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN; 699 unsigned int skboff = skb->dev->hard_header_len; 700 u32 at = G_TC_AT(skb->tc_verd); 701 int new_len = skb->len + hdrm; 702 bool exceed_mtu = false; 703 int err; 704 705 if (at & AT_EGRESS) { 706 if (new_len > skb->dev->mtu) 707 exceed_mtu = true; 708 } 709 710 spin_lock(&ife->tcf_lock); 711 bstats_update(&ife->tcf_bstats, skb); 712 tcf_lastuse_update(&ife->tcf_tm); 713 714 if (!metalen) { /* no metadata to send */ 715 /* abuse overlimits to count when we allow packet 716 * with no metadata 717 */ 718 ife->tcf_qstats.overlimits++; 719 spin_unlock(&ife->tcf_lock); 720 return action; 721 } 722 /* could be stupid policy setup or mtu config 723 * so lets be conservative.. */ 724 if ((action == TC_ACT_SHOT) || exceed_mtu) { 725 ife->tcf_qstats.drops++; 726 spin_unlock(&ife->tcf_lock); 727 return TC_ACT_SHOT; 728 } 729 730 iethh = eth_hdr(skb); 731 732 err = skb_cow_head(skb, hdrm); 733 if (unlikely(err)) { 734 ife->tcf_qstats.drops++; 735 spin_unlock(&ife->tcf_lock); 736 return TC_ACT_SHOT; 737 } 738 739 if (!(at & AT_EGRESS)) 740 skb_push(skb, skb->dev->hard_header_len); 741 742 __skb_push(skb, hdrm); 743 memcpy(skb->data, iethh, skb->mac_len); 744 skb_reset_mac_header(skb); 745 oethh = eth_hdr(skb); 746 747 /*total metadata length */ 748 metalen += IFE_METAHDRLEN; 749 metalen = htons(metalen); 750 memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN); 751 skboff += IFE_METAHDRLEN; 752 753 /* XXX: we dont have a clever way of telling encode to 754 * not repeat some of the computations that are done by 755 * ops->presence_check... 756 */ 757 list_for_each_entry(e, &ife->metalist, metalist) { 758 if (e->ops->encode) { 759 err = e->ops->encode(skb, (void *)(skb->data + skboff), 760 e); 761 } 762 if (err < 0) { 763 /* too corrupt to keep around if overwritten */ 764 ife->tcf_qstats.drops++; 765 spin_unlock(&ife->tcf_lock); 766 return TC_ACT_SHOT; 767 } 768 skboff += err; 769 } 770 771 if (!is_zero_ether_addr(ife->eth_src)) 772 ether_addr_copy(oethh->h_source, ife->eth_src); 773 else 774 ether_addr_copy(oethh->h_source, iethh->h_source); 775 if (!is_zero_ether_addr(ife->eth_dst)) 776 ether_addr_copy(oethh->h_dest, ife->eth_dst); 777 else 778 ether_addr_copy(oethh->h_dest, iethh->h_dest); 779 oethh->h_proto = htons(ife->eth_type); 780 781 if (!(at & AT_EGRESS)) 782 skb_pull(skb, skb->dev->hard_header_len); 783 784 spin_unlock(&ife->tcf_lock); 785 786 return action; 787 } 788 789 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a, 790 struct tcf_result *res) 791 { 792 struct tcf_ife_info *ife = a->priv; 793 794 if (ife->flags & IFE_ENCODE) 795 return tcf_ife_encode(skb, a, res); 796 797 if (!(ife->flags & IFE_ENCODE)) 798 return tcf_ife_decode(skb, a, res); 799 800 pr_info_ratelimited("unknown failure(policy neither de/encode\n"); 801 spin_lock(&ife->tcf_lock); 802 bstats_update(&ife->tcf_bstats, skb); 803 tcf_lastuse_update(&ife->tcf_tm); 804 ife->tcf_qstats.drops++; 805 spin_unlock(&ife->tcf_lock); 806 807 return TC_ACT_SHOT; 808 } 809 810 static int tcf_ife_walker(struct net *net, struct sk_buff *skb, 811 struct netlink_callback *cb, int type, 812 struct tc_action *a) 813 { 814 struct tc_action_net *tn = net_generic(net, ife_net_id); 815 816 return tcf_generic_walker(tn, skb, cb, type, a); 817 } 818 819 static int tcf_ife_search(struct net *net, struct tc_action *a, u32 index) 820 { 821 struct tc_action_net *tn = net_generic(net, ife_net_id); 822 823 return tcf_hash_search(tn, a, index); 824 } 825 826 static struct tc_action_ops act_ife_ops = { 827 .kind = "ife", 828 .type = TCA_ACT_IFE, 829 .owner = THIS_MODULE, 830 .act = tcf_ife_act, 831 .dump = tcf_ife_dump, 832 .cleanup = tcf_ife_cleanup, 833 .init = tcf_ife_init, 834 .walk = tcf_ife_walker, 835 .lookup = tcf_ife_search, 836 }; 837 838 static __net_init int ife_init_net(struct net *net) 839 { 840 struct tc_action_net *tn = net_generic(net, ife_net_id); 841 842 return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK); 843 } 844 845 static void __net_exit ife_exit_net(struct net *net) 846 { 847 struct tc_action_net *tn = net_generic(net, ife_net_id); 848 849 tc_action_net_exit(tn); 850 } 851 852 static struct pernet_operations ife_net_ops = { 853 .init = ife_init_net, 854 .exit = ife_exit_net, 855 .id = &ife_net_id, 856 .size = sizeof(struct tc_action_net), 857 }; 858 859 static int __init ife_init_module(void) 860 { 861 return tcf_register_action(&act_ife_ops, &ife_net_ops); 862 } 863 864 static void __exit ife_cleanup_module(void) 865 { 866 tcf_unregister_action(&act_ife_ops, &ife_net_ops); 867 } 868 869 module_init(ife_init_module); 870 module_exit(ife_cleanup_module); 871 872 MODULE_AUTHOR("Jamal Hadi Salim(2015)"); 873 MODULE_DESCRIPTION("Inter-FE LFB action"); 874 MODULE_LICENSE("GPL"); 875