1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Checksum updating actions 4 * 5 * Copyright (c) 2010 Gregoire Baron <baronchon@n7mm.org> 6 */ 7 8 #include <linux/types.h> 9 #include <linux/init.h> 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/spinlock.h> 13 14 #include <linux/netlink.h> 15 #include <net/netlink.h> 16 #include <linux/rtnetlink.h> 17 18 #include <linux/skbuff.h> 19 20 #include <net/ip.h> 21 #include <net/ipv6.h> 22 #include <net/icmp.h> 23 #include <linux/icmpv6.h> 24 #include <linux/igmp.h> 25 #include <net/tcp.h> 26 #include <net/udp.h> 27 #include <net/ip6_checksum.h> 28 #include <net/sctp/checksum.h> 29 30 #include <net/act_api.h> 31 #include <net/pkt_cls.h> 32 33 #include <linux/tc_act/tc_csum.h> 34 #include <net/tc_act/tc_csum.h> 35 #include <net/tc_wrapper.h> 36 37 static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = { 38 [TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), }, 39 }; 40 41 static struct tc_action_ops act_csum_ops; 42 43 static int tcf_csum_init(struct net *net, struct nlattr *nla, 44 struct nlattr *est, struct tc_action **a, 45 struct tcf_proto *tp, 46 u32 flags, struct netlink_ext_ack *extack) 47 { 48 struct tc_action_net *tn = net_generic(net, act_csum_ops.net_id); 49 bool bind = flags & TCA_ACT_FLAGS_BIND; 50 struct tcf_csum_params *params_new; 51 struct nlattr *tb[TCA_CSUM_MAX + 1]; 52 struct tcf_chain *goto_ch = NULL; 53 struct tc_csum *parm; 54 struct tcf_csum *p; 55 int ret = 0, err; 56 u32 index; 57 58 if (nla == NULL) 59 return -EINVAL; 60 61 err = nla_parse_nested_deprecated(tb, TCA_CSUM_MAX, nla, csum_policy, 62 NULL); 63 if (err < 0) 64 return err; 65 66 if (tb[TCA_CSUM_PARMS] == NULL) 67 return -EINVAL; 68 parm = nla_data(tb[TCA_CSUM_PARMS]); 69 index = parm->index; 70 err = tcf_idr_check_alloc(tn, &index, a, bind); 71 if (!err) { 72 ret = tcf_idr_create_from_flags(tn, index, est, a, 73 &act_csum_ops, bind, flags); 74 if (ret) { 75 tcf_idr_cleanup(tn, index); 76 return ret; 77 } 78 ret = ACT_P_CREATED; 79 } else if (err > 0) { 80 if (bind) /* dont override defaults */ 81 return ACT_P_BOUND; 82 if (!(flags & TCA_ACT_FLAGS_REPLACE)) { 83 tcf_idr_release(*a, bind); 84 return -EEXIST; 85 } 86 } else { 87 return err; 88 } 89 90 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); 91 if (err < 0) 92 goto release_idr; 93 94 p = to_tcf_csum(*a); 95 96 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); 97 if (unlikely(!params_new)) { 98 err = -ENOMEM; 99 goto put_chain; 100 } 101 params_new->update_flags = parm->update_flags; 102 103 spin_lock_bh(&p->tcf_lock); 104 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); 105 params_new = rcu_replace_pointer(p->params, params_new, 106 lockdep_is_held(&p->tcf_lock)); 107 spin_unlock_bh(&p->tcf_lock); 108 109 if (goto_ch) 110 tcf_chain_put_by_act(goto_ch); 111 if (params_new) 112 kfree_rcu(params_new, rcu); 113 114 return ret; 115 put_chain: 116 if (goto_ch) 117 tcf_chain_put_by_act(goto_ch); 118 release_idr: 119 tcf_idr_release(*a, bind); 120 return err; 121 } 122 123 /** 124 * tcf_csum_skb_nextlayer - Get next layer pointer 125 * @skb: sk_buff to use 126 * @ihl: previous summed headers length 127 * @ipl: complete packet length 128 * @jhl: next header length 129 * 130 * Check the expected next layer availability in the specified sk_buff. 131 * Return the next layer pointer if pass, NULL otherwise. 132 */ 133 static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, 134 unsigned int ihl, unsigned int ipl, 135 unsigned int jhl) 136 { 137 int ntkoff = skb_network_offset(skb); 138 int hl = ihl + jhl; 139 140 if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || 141 skb_try_make_writable(skb, hl + ntkoff)) 142 return NULL; 143 else 144 return (void *)(skb_network_header(skb) + ihl); 145 } 146 147 static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl, 148 unsigned int ipl) 149 { 150 struct icmphdr *icmph; 151 152 icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); 153 if (icmph == NULL) 154 return 0; 155 156 icmph->checksum = 0; 157 skb->csum = csum_partial(icmph, ipl - ihl, 0); 158 icmph->checksum = csum_fold(skb->csum); 159 160 skb->ip_summed = CHECKSUM_NONE; 161 162 return 1; 163 } 164 165 static int tcf_csum_ipv4_igmp(struct sk_buff *skb, 166 unsigned int ihl, unsigned int ipl) 167 { 168 struct igmphdr *igmph; 169 170 igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); 171 if (igmph == NULL) 172 return 0; 173 174 igmph->csum = 0; 175 skb->csum = csum_partial(igmph, ipl - ihl, 0); 176 igmph->csum = csum_fold(skb->csum); 177 178 skb->ip_summed = CHECKSUM_NONE; 179 180 return 1; 181 } 182 183 static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl, 184 unsigned int ipl) 185 { 186 struct icmp6hdr *icmp6h; 187 const struct ipv6hdr *ip6h; 188 189 icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); 190 if (icmp6h == NULL) 191 return 0; 192 193 ip6h = ipv6_hdr(skb); 194 icmp6h->icmp6_cksum = 0; 195 skb->csum = csum_partial(icmp6h, ipl - ihl, 0); 196 icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 197 ipl - ihl, IPPROTO_ICMPV6, 198 skb->csum); 199 200 skb->ip_summed = CHECKSUM_NONE; 201 202 return 1; 203 } 204 205 static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl, 206 unsigned int ipl) 207 { 208 struct tcphdr *tcph; 209 const struct iphdr *iph; 210 211 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) 212 return 1; 213 214 tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); 215 if (tcph == NULL) 216 return 0; 217 218 iph = ip_hdr(skb); 219 tcph->check = 0; 220 skb->csum = csum_partial(tcph, ipl - ihl, 0); 221 tcph->check = tcp_v4_check(ipl - ihl, 222 iph->saddr, iph->daddr, skb->csum); 223 224 skb->ip_summed = CHECKSUM_NONE; 225 226 return 1; 227 } 228 229 static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl, 230 unsigned int ipl) 231 { 232 struct tcphdr *tcph; 233 const struct ipv6hdr *ip6h; 234 235 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) 236 return 1; 237 238 tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); 239 if (tcph == NULL) 240 return 0; 241 242 ip6h = ipv6_hdr(skb); 243 tcph->check = 0; 244 skb->csum = csum_partial(tcph, ipl - ihl, 0); 245 tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 246 ipl - ihl, IPPROTO_TCP, 247 skb->csum); 248 249 skb->ip_summed = CHECKSUM_NONE; 250 251 return 1; 252 } 253 254 static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl, 255 unsigned int ipl, int udplite) 256 { 257 struct udphdr *udph; 258 const struct iphdr *iph; 259 u16 ul; 260 261 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) 262 return 1; 263 264 /* 265 * Support both UDP and UDPLITE checksum algorithms, Don't use 266 * udph->len to get the real length without any protocol check, 267 * UDPLITE uses udph->len for another thing, 268 * Use iph->tot_len, or just ipl. 269 */ 270 271 udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); 272 if (udph == NULL) 273 return 0; 274 275 iph = ip_hdr(skb); 276 ul = ntohs(udph->len); 277 278 if (udplite || udph->check) { 279 280 udph->check = 0; 281 282 if (udplite) { 283 if (ul == 0) 284 skb->csum = csum_partial(udph, ipl - ihl, 0); 285 else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) 286 skb->csum = csum_partial(udph, ul, 0); 287 else 288 goto ignore_obscure_skb; 289 } else { 290 if (ul != ipl - ihl) 291 goto ignore_obscure_skb; 292 293 skb->csum = csum_partial(udph, ul, 0); 294 } 295 296 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, 297 ul, iph->protocol, 298 skb->csum); 299 300 if (!udph->check) 301 udph->check = CSUM_MANGLED_0; 302 } 303 304 skb->ip_summed = CHECKSUM_NONE; 305 306 ignore_obscure_skb: 307 return 1; 308 } 309 310 static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl, 311 unsigned int ipl, int udplite) 312 { 313 struct udphdr *udph; 314 const struct ipv6hdr *ip6h; 315 u16 ul; 316 317 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) 318 return 1; 319 320 /* 321 * Support both UDP and UDPLITE checksum algorithms, Don't use 322 * udph->len to get the real length without any protocol check, 323 * UDPLITE uses udph->len for another thing, 324 * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl. 325 */ 326 327 udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); 328 if (udph == NULL) 329 return 0; 330 331 ip6h = ipv6_hdr(skb); 332 ul = ntohs(udph->len); 333 334 udph->check = 0; 335 336 if (udplite) { 337 if (ul == 0) 338 skb->csum = csum_partial(udph, ipl - ihl, 0); 339 340 else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) 341 skb->csum = csum_partial(udph, ul, 0); 342 343 else 344 goto ignore_obscure_skb; 345 } else { 346 if (ul != ipl - ihl) 347 goto ignore_obscure_skb; 348 349 skb->csum = csum_partial(udph, ul, 0); 350 } 351 352 udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, 353 udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, 354 skb->csum); 355 356 if (!udph->check) 357 udph->check = CSUM_MANGLED_0; 358 359 skb->ip_summed = CHECKSUM_NONE; 360 361 ignore_obscure_skb: 362 return 1; 363 } 364 365 static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl, 366 unsigned int ipl) 367 { 368 struct sctphdr *sctph; 369 370 if (skb_is_gso(skb) && skb_is_gso_sctp(skb)) 371 return 1; 372 373 sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph)); 374 if (!sctph) 375 return 0; 376 377 sctph->checksum = sctp_compute_cksum(skb, 378 skb_network_offset(skb) + ihl); 379 skb_reset_csum_not_inet(skb); 380 381 return 1; 382 } 383 384 static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) 385 { 386 const struct iphdr *iph; 387 int ntkoff; 388 389 ntkoff = skb_network_offset(skb); 390 391 if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) 392 goto fail; 393 394 iph = ip_hdr(skb); 395 396 switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { 397 case IPPROTO_ICMP: 398 if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) 399 if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, 400 ntohs(iph->tot_len))) 401 goto fail; 402 break; 403 case IPPROTO_IGMP: 404 if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) 405 if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, 406 ntohs(iph->tot_len))) 407 goto fail; 408 break; 409 case IPPROTO_TCP: 410 if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) 411 if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4, 412 ntohs(iph->tot_len))) 413 goto fail; 414 break; 415 case IPPROTO_UDP: 416 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) 417 if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, 418 ntohs(iph->tot_len), 0)) 419 goto fail; 420 break; 421 case IPPROTO_UDPLITE: 422 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) 423 if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, 424 ntohs(iph->tot_len), 1)) 425 goto fail; 426 break; 427 case IPPROTO_SCTP: 428 if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && 429 !tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len))) 430 goto fail; 431 break; 432 } 433 434 if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { 435 if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff)) 436 goto fail; 437 438 ip_send_check(ip_hdr(skb)); 439 } 440 441 return 1; 442 443 fail: 444 return 0; 445 } 446 447 static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl, 448 unsigned int *pl) 449 { 450 int off, len, optlen; 451 unsigned char *xh = (void *)ip6xh; 452 453 off = sizeof(*ip6xh); 454 len = ixhl - off; 455 456 while (len > 1) { 457 switch (xh[off]) { 458 case IPV6_TLV_PAD1: 459 optlen = 1; 460 break; 461 case IPV6_TLV_JUMBO: 462 optlen = xh[off + 1] + 2; 463 if (optlen != 6 || len < 6 || (off & 3) != 2) 464 /* wrong jumbo option length/alignment */ 465 return 0; 466 *pl = ntohl(*(__be32 *)(xh + off + 2)); 467 goto done; 468 default: 469 optlen = xh[off + 1] + 2; 470 if (optlen > len) 471 /* ignore obscure options */ 472 goto done; 473 break; 474 } 475 off += optlen; 476 len -= optlen; 477 } 478 479 done: 480 return 1; 481 } 482 483 static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) 484 { 485 struct ipv6hdr *ip6h; 486 struct ipv6_opt_hdr *ip6xh; 487 unsigned int hl, ixhl; 488 unsigned int pl; 489 int ntkoff; 490 u8 nexthdr; 491 492 ntkoff = skb_network_offset(skb); 493 494 hl = sizeof(*ip6h); 495 496 if (!pskb_may_pull(skb, hl + ntkoff)) 497 goto fail; 498 499 ip6h = ipv6_hdr(skb); 500 501 pl = ntohs(ip6h->payload_len); 502 nexthdr = ip6h->nexthdr; 503 504 do { 505 switch (nexthdr) { 506 case NEXTHDR_FRAGMENT: 507 goto ignore_skb; 508 case NEXTHDR_ROUTING: 509 case NEXTHDR_HOP: 510 case NEXTHDR_DEST: 511 if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) 512 goto fail; 513 ip6xh = (void *)(skb_network_header(skb) + hl); 514 ixhl = ipv6_optlen(ip6xh); 515 if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) 516 goto fail; 517 ip6xh = (void *)(skb_network_header(skb) + hl); 518 if ((nexthdr == NEXTHDR_HOP) && 519 !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) 520 goto fail; 521 nexthdr = ip6xh->nexthdr; 522 hl += ixhl; 523 break; 524 case IPPROTO_ICMPV6: 525 if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) 526 if (!tcf_csum_ipv6_icmp(skb, 527 hl, pl + sizeof(*ip6h))) 528 goto fail; 529 goto done; 530 case IPPROTO_TCP: 531 if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) 532 if (!tcf_csum_ipv6_tcp(skb, 533 hl, pl + sizeof(*ip6h))) 534 goto fail; 535 goto done; 536 case IPPROTO_UDP: 537 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) 538 if (!tcf_csum_ipv6_udp(skb, hl, 539 pl + sizeof(*ip6h), 0)) 540 goto fail; 541 goto done; 542 case IPPROTO_UDPLITE: 543 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) 544 if (!tcf_csum_ipv6_udp(skb, hl, 545 pl + sizeof(*ip6h), 1)) 546 goto fail; 547 goto done; 548 case IPPROTO_SCTP: 549 if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && 550 !tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h))) 551 goto fail; 552 goto done; 553 default: 554 goto ignore_skb; 555 } 556 } while (pskb_may_pull(skb, hl + 1 + ntkoff)); 557 558 done: 559 ignore_skb: 560 return 1; 561 562 fail: 563 return 0; 564 } 565 566 TC_INDIRECT_SCOPE int tcf_csum_act(struct sk_buff *skb, 567 const struct tc_action *a, 568 struct tcf_result *res) 569 { 570 struct tcf_csum *p = to_tcf_csum(a); 571 bool orig_vlan_tag_present = false; 572 unsigned int vlan_hdr_count = 0; 573 struct tcf_csum_params *params; 574 u32 update_flags; 575 __be16 protocol; 576 int action; 577 578 params = rcu_dereference_bh(p->params); 579 580 tcf_lastuse_update(&p->tcf_tm); 581 tcf_action_update_bstats(&p->common, skb); 582 583 action = READ_ONCE(p->tcf_action); 584 if (unlikely(action == TC_ACT_SHOT)) 585 goto drop; 586 587 update_flags = params->update_flags; 588 protocol = skb_protocol(skb, false); 589 again: 590 switch (protocol) { 591 case cpu_to_be16(ETH_P_IP): 592 if (!tcf_csum_ipv4(skb, update_flags)) 593 goto drop; 594 break; 595 case cpu_to_be16(ETH_P_IPV6): 596 if (!tcf_csum_ipv6(skb, update_flags)) 597 goto drop; 598 break; 599 case cpu_to_be16(ETH_P_8021AD): 600 fallthrough; 601 case cpu_to_be16(ETH_P_8021Q): 602 if (skb_vlan_tag_present(skb) && !orig_vlan_tag_present) { 603 protocol = skb->protocol; 604 orig_vlan_tag_present = true; 605 } else { 606 struct vlan_hdr *vlan = (struct vlan_hdr *)skb->data; 607 608 protocol = vlan->h_vlan_encapsulated_proto; 609 skb_pull(skb, VLAN_HLEN); 610 skb_reset_network_header(skb); 611 vlan_hdr_count++; 612 } 613 goto again; 614 } 615 616 out: 617 /* Restore the skb for the pulled VLAN tags */ 618 while (vlan_hdr_count--) { 619 skb_push(skb, VLAN_HLEN); 620 skb_reset_network_header(skb); 621 } 622 623 return action; 624 625 drop: 626 tcf_action_inc_drop_qstats(&p->common); 627 action = TC_ACT_SHOT; 628 goto out; 629 } 630 631 static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind, 632 int ref) 633 { 634 unsigned char *b = skb_tail_pointer(skb); 635 struct tcf_csum *p = to_tcf_csum(a); 636 struct tcf_csum_params *params; 637 struct tc_csum opt = { 638 .index = p->tcf_index, 639 .refcnt = refcount_read(&p->tcf_refcnt) - ref, 640 .bindcnt = atomic_read(&p->tcf_bindcnt) - bind, 641 }; 642 struct tcf_t t; 643 644 spin_lock_bh(&p->tcf_lock); 645 params = rcu_dereference_protected(p->params, 646 lockdep_is_held(&p->tcf_lock)); 647 opt.action = p->tcf_action; 648 opt.update_flags = params->update_flags; 649 650 if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt)) 651 goto nla_put_failure; 652 653 tcf_tm_dump(&t, &p->tcf_tm); 654 if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD)) 655 goto nla_put_failure; 656 spin_unlock_bh(&p->tcf_lock); 657 658 return skb->len; 659 660 nla_put_failure: 661 spin_unlock_bh(&p->tcf_lock); 662 nlmsg_trim(skb, b); 663 return -1; 664 } 665 666 static void tcf_csum_cleanup(struct tc_action *a) 667 { 668 struct tcf_csum *p = to_tcf_csum(a); 669 struct tcf_csum_params *params; 670 671 params = rcu_dereference_protected(p->params, 1); 672 if (params) 673 kfree_rcu(params, rcu); 674 } 675 676 static size_t tcf_csum_get_fill_size(const struct tc_action *act) 677 { 678 return nla_total_size(sizeof(struct tc_csum)); 679 } 680 681 static int tcf_csum_offload_act_setup(struct tc_action *act, void *entry_data, 682 u32 *index_inc, bool bind, 683 struct netlink_ext_ack *extack) 684 { 685 if (bind) { 686 struct flow_action_entry *entry = entry_data; 687 688 entry->id = FLOW_ACTION_CSUM; 689 entry->csum_flags = tcf_csum_update_flags(act); 690 *index_inc = 1; 691 } else { 692 struct flow_offload_action *fl_action = entry_data; 693 694 fl_action->id = FLOW_ACTION_CSUM; 695 } 696 697 return 0; 698 } 699 700 static struct tc_action_ops act_csum_ops = { 701 .kind = "csum", 702 .id = TCA_ID_CSUM, 703 .owner = THIS_MODULE, 704 .act = tcf_csum_act, 705 .dump = tcf_csum_dump, 706 .init = tcf_csum_init, 707 .cleanup = tcf_csum_cleanup, 708 .get_fill_size = tcf_csum_get_fill_size, 709 .offload_act_setup = tcf_csum_offload_act_setup, 710 .size = sizeof(struct tcf_csum), 711 }; 712 MODULE_ALIAS_NET_ACT("csum"); 713 714 static __net_init int csum_init_net(struct net *net) 715 { 716 struct tc_action_net *tn = net_generic(net, act_csum_ops.net_id); 717 718 return tc_action_net_init(net, tn, &act_csum_ops); 719 } 720 721 static void __net_exit csum_exit_net(struct list_head *net_list) 722 { 723 tc_action_net_exit(net_list, act_csum_ops.net_id); 724 } 725 726 static struct pernet_operations csum_net_ops = { 727 .init = csum_init_net, 728 .exit_batch = csum_exit_net, 729 .id = &act_csum_ops.net_id, 730 .size = sizeof(struct tc_action_net), 731 }; 732 733 MODULE_DESCRIPTION("Checksum updating actions"); 734 MODULE_LICENSE("GPL"); 735 736 static int __init csum_init_module(void) 737 { 738 return tcf_register_action(&act_csum_ops, &csum_net_ops); 739 } 740 741 static void __exit csum_cleanup_module(void) 742 { 743 tcf_unregister_action(&act_csum_ops, &csum_net_ops); 744 } 745 746 module_init(csum_init_module); 747 module_exit(csum_cleanup_module); 748