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_obj(*params_new); 97 if (unlikely(!params_new)) { 98 err = -ENOMEM; 99 goto put_chain; 100 } 101 params_new->update_flags = parm->update_flags; 102 params_new->action = parm->action; 103 104 spin_lock_bh(&p->tcf_lock); 105 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); 106 params_new = rcu_replace_pointer(p->params, params_new, 107 lockdep_is_held(&p->tcf_lock)); 108 spin_unlock_bh(&p->tcf_lock); 109 110 if (goto_ch) 111 tcf_chain_put_by_act(goto_ch); 112 if (params_new) 113 kfree_rcu(params_new, rcu); 114 115 return ret; 116 put_chain: 117 if (goto_ch) 118 tcf_chain_put_by_act(goto_ch); 119 release_idr: 120 tcf_idr_release(*a, bind); 121 return err; 122 } 123 124 /** 125 * tcf_csum_skb_nextlayer - Get next layer pointer 126 * @skb: sk_buff to use 127 * @ihl: previous summed headers length 128 * @ipl: complete packet length 129 * @jhl: next header length 130 * 131 * Check the expected next layer availability in the specified sk_buff. 132 * Return the next layer pointer if pass, NULL otherwise. 133 */ 134 static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, 135 unsigned int ihl, unsigned int ipl, 136 unsigned int jhl) 137 { 138 int ntkoff = skb_network_offset(skb); 139 int hl = ihl + jhl; 140 141 if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || 142 skb_try_make_writable(skb, hl + ntkoff)) 143 return NULL; 144 else 145 return (void *)(skb_network_header(skb) + ihl); 146 } 147 148 static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl, 149 unsigned int ipl) 150 { 151 struct icmphdr *icmph; 152 153 icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); 154 if (icmph == NULL) 155 return 0; 156 157 icmph->checksum = 0; 158 skb->csum = csum_partial(icmph, ipl - ihl, 0); 159 icmph->checksum = csum_fold(skb->csum); 160 161 skb->ip_summed = CHECKSUM_NONE; 162 163 return 1; 164 } 165 166 static int tcf_csum_ipv4_igmp(struct sk_buff *skb, 167 unsigned int ihl, unsigned int ipl) 168 { 169 struct igmphdr *igmph; 170 171 igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); 172 if (igmph == NULL) 173 return 0; 174 175 igmph->csum = 0; 176 skb->csum = csum_partial(igmph, ipl - ihl, 0); 177 igmph->csum = csum_fold(skb->csum); 178 179 skb->ip_summed = CHECKSUM_NONE; 180 181 return 1; 182 } 183 184 static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl, 185 unsigned int ipl) 186 { 187 struct icmp6hdr *icmp6h; 188 const struct ipv6hdr *ip6h; 189 190 icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); 191 if (icmp6h == NULL) 192 return 0; 193 194 ip6h = ipv6_hdr(skb); 195 icmp6h->icmp6_cksum = 0; 196 skb->csum = csum_partial(icmp6h, ipl - ihl, 0); 197 icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 198 ipl - ihl, IPPROTO_ICMPV6, 199 skb->csum); 200 201 skb->ip_summed = CHECKSUM_NONE; 202 203 return 1; 204 } 205 206 static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl, 207 unsigned int ipl) 208 { 209 struct tcphdr *tcph; 210 const struct iphdr *iph; 211 212 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) 213 return 1; 214 215 tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); 216 if (tcph == NULL) 217 return 0; 218 219 iph = ip_hdr(skb); 220 tcph->check = 0; 221 skb->csum = csum_partial(tcph, ipl - ihl, 0); 222 tcph->check = tcp_v4_check(ipl - ihl, 223 iph->saddr, iph->daddr, skb->csum); 224 225 skb->ip_summed = CHECKSUM_NONE; 226 227 return 1; 228 } 229 230 static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl, 231 unsigned int ipl) 232 { 233 struct tcphdr *tcph; 234 const struct ipv6hdr *ip6h; 235 236 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) 237 return 1; 238 239 tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); 240 if (tcph == NULL) 241 return 0; 242 243 ip6h = ipv6_hdr(skb); 244 tcph->check = 0; 245 skb->csum = csum_partial(tcph, ipl - ihl, 0); 246 tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 247 ipl - ihl, IPPROTO_TCP, 248 skb->csum); 249 250 skb->ip_summed = CHECKSUM_NONE; 251 252 return 1; 253 } 254 255 static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl, 256 unsigned int ipl, int udplite) 257 { 258 struct udphdr *udph; 259 const struct iphdr *iph; 260 u16 ul; 261 262 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & 263 (SKB_GSO_UDP | SKB_GSO_UDP_L4 | 264 SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP_TUNNEL_CSUM)) 265 return 1; 266 267 /* 268 * Support both UDP and UDPLITE checksum algorithms, Don't use 269 * udph->len to get the real length without any protocol check, 270 * UDPLITE uses udph->len for another thing, 271 * Use iph->tot_len, or just ipl. 272 */ 273 274 udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); 275 if (udph == NULL) 276 return 0; 277 278 iph = ip_hdr(skb); 279 ul = ntohs(udph->len); 280 281 if (udplite || udph->check) { 282 283 udph->check = 0; 284 285 if (udplite) { 286 if (ul == 0) 287 skb->csum = csum_partial(udph, ipl - ihl, 0); 288 else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) 289 skb->csum = csum_partial(udph, ul, 0); 290 else 291 goto ignore_obscure_skb; 292 } else { 293 if (ul != ipl - ihl) 294 goto ignore_obscure_skb; 295 296 skb->csum = csum_partial(udph, ul, 0); 297 } 298 299 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, 300 ul, iph->protocol, 301 skb->csum); 302 303 if (!udph->check) 304 udph->check = CSUM_MANGLED_0; 305 } 306 307 skb->ip_summed = CHECKSUM_NONE; 308 309 ignore_obscure_skb: 310 return 1; 311 } 312 313 static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl, 314 unsigned int ipl, int udplite) 315 { 316 struct udphdr *udph; 317 const struct ipv6hdr *ip6h; 318 u16 ul; 319 320 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & 321 (SKB_GSO_UDP | SKB_GSO_UDP_L4 | 322 SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP_TUNNEL_CSUM)) 323 return 1; 324 325 /* 326 * Support both UDP and UDPLITE checksum algorithms, Don't use 327 * udph->len to get the real length without any protocol check, 328 * UDPLITE uses udph->len for another thing, 329 * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl. 330 */ 331 332 udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); 333 if (udph == NULL) 334 return 0; 335 336 ip6h = ipv6_hdr(skb); 337 ul = ntohs(udph->len); 338 339 udph->check = 0; 340 341 if (udplite) { 342 if (ul == 0) 343 skb->csum = csum_partial(udph, ipl - ihl, 0); 344 345 else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) 346 skb->csum = csum_partial(udph, ul, 0); 347 348 else 349 goto ignore_obscure_skb; 350 } else { 351 if (ul != ipl - ihl) 352 goto ignore_obscure_skb; 353 354 skb->csum = csum_partial(udph, ul, 0); 355 } 356 357 udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, 358 udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, 359 skb->csum); 360 361 if (!udph->check) 362 udph->check = CSUM_MANGLED_0; 363 364 skb->ip_summed = CHECKSUM_NONE; 365 366 ignore_obscure_skb: 367 return 1; 368 } 369 370 static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl, 371 unsigned int ipl) 372 { 373 struct sctphdr *sctph; 374 375 if (skb_is_gso(skb) && skb_is_gso_sctp(skb)) 376 return 1; 377 378 sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph)); 379 if (!sctph) 380 return 0; 381 382 sctph->checksum = sctp_compute_cksum(skb, 383 skb_network_offset(skb) + ihl); 384 skb_reset_csum_not_inet(skb); 385 386 return 1; 387 } 388 389 static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) 390 { 391 const struct iphdr *iph; 392 int ntkoff; 393 394 ntkoff = skb_network_offset(skb); 395 396 if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) 397 goto fail; 398 399 iph = ip_hdr(skb); 400 401 switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { 402 case IPPROTO_ICMP: 403 if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) 404 if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, 405 ntohs(iph->tot_len))) 406 goto fail; 407 break; 408 case IPPROTO_IGMP: 409 if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) 410 if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, 411 ntohs(iph->tot_len))) 412 goto fail; 413 break; 414 case IPPROTO_TCP: 415 if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) 416 if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4, 417 ntohs(iph->tot_len))) 418 goto fail; 419 break; 420 case IPPROTO_UDP: 421 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) 422 if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, 423 ntohs(iph->tot_len), 0)) 424 goto fail; 425 break; 426 case IPPROTO_UDPLITE: 427 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) 428 if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, 429 ntohs(iph->tot_len), 1)) 430 goto fail; 431 break; 432 case IPPROTO_SCTP: 433 if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && 434 !tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len))) 435 goto fail; 436 break; 437 } 438 439 if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { 440 if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff)) 441 goto fail; 442 443 ip_send_check(ip_hdr(skb)); 444 } 445 446 return 1; 447 448 fail: 449 return 0; 450 } 451 452 static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl, 453 unsigned int *pl) 454 { 455 int off, len, optlen; 456 unsigned char *xh = (void *)ip6xh; 457 458 off = sizeof(*ip6xh); 459 len = ixhl - off; 460 461 while (len > 1) { 462 switch (xh[off]) { 463 case IPV6_TLV_PAD1: 464 optlen = 1; 465 break; 466 case IPV6_TLV_JUMBO: 467 optlen = xh[off + 1] + 2; 468 if (optlen != 6 || len < 6 || (off & 3) != 2) 469 /* wrong jumbo option length/alignment */ 470 return 0; 471 *pl = ntohl(*(__be32 *)(xh + off + 2)); 472 goto done; 473 default: 474 optlen = xh[off + 1] + 2; 475 if (optlen > len) 476 /* ignore obscure options */ 477 goto done; 478 break; 479 } 480 off += optlen; 481 len -= optlen; 482 } 483 484 done: 485 return 1; 486 } 487 488 static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) 489 { 490 struct ipv6hdr *ip6h; 491 struct ipv6_opt_hdr *ip6xh; 492 unsigned int hl, ixhl; 493 unsigned int pl; 494 int ntkoff; 495 u8 nexthdr; 496 497 ntkoff = skb_network_offset(skb); 498 499 hl = sizeof(*ip6h); 500 501 if (!pskb_may_pull(skb, hl + ntkoff)) 502 goto fail; 503 504 ip6h = ipv6_hdr(skb); 505 506 pl = ntohs(ip6h->payload_len); 507 nexthdr = ip6h->nexthdr; 508 509 do { 510 switch (nexthdr) { 511 case NEXTHDR_FRAGMENT: 512 goto ignore_skb; 513 case NEXTHDR_ROUTING: 514 case NEXTHDR_HOP: 515 case NEXTHDR_DEST: 516 if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) 517 goto fail; 518 ip6xh = (void *)(skb_network_header(skb) + hl); 519 ixhl = ipv6_optlen(ip6xh); 520 if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) 521 goto fail; 522 ip6xh = (void *)(skb_network_header(skb) + hl); 523 if ((nexthdr == NEXTHDR_HOP) && 524 !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) 525 goto fail; 526 nexthdr = ip6xh->nexthdr; 527 hl += ixhl; 528 break; 529 case IPPROTO_ICMPV6: 530 if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) 531 if (!tcf_csum_ipv6_icmp(skb, 532 hl, pl + sizeof(*ip6h))) 533 goto fail; 534 goto done; 535 case IPPROTO_TCP: 536 if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) 537 if (!tcf_csum_ipv6_tcp(skb, 538 hl, pl + sizeof(*ip6h))) 539 goto fail; 540 goto done; 541 case IPPROTO_UDP: 542 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) 543 if (!tcf_csum_ipv6_udp(skb, hl, 544 pl + sizeof(*ip6h), 0)) 545 goto fail; 546 goto done; 547 case IPPROTO_UDPLITE: 548 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) 549 if (!tcf_csum_ipv6_udp(skb, hl, 550 pl + sizeof(*ip6h), 1)) 551 goto fail; 552 goto done; 553 case IPPROTO_SCTP: 554 if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && 555 !tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h))) 556 goto fail; 557 goto done; 558 default: 559 goto ignore_skb; 560 } 561 } while (pskb_may_pull(skb, hl + 1 + ntkoff)); 562 563 done: 564 ignore_skb: 565 return 1; 566 567 fail: 568 return 0; 569 } 570 571 TC_INDIRECT_SCOPE int tcf_csum_act(struct sk_buff *skb, 572 const struct tc_action *a, 573 struct tcf_result *res) 574 { 575 struct tcf_csum *p = to_tcf_csum(a); 576 bool orig_vlan_tag_present = false; 577 unsigned int vlan_hdr_count = 0; 578 struct tcf_csum_params *params; 579 u32 update_flags; 580 __be16 protocol; 581 int action; 582 583 params = rcu_dereference_bh(p->params); 584 585 tcf_lastuse_update(&p->tcf_tm); 586 tcf_action_update_bstats(&p->common, skb); 587 588 action = params->action; 589 if (unlikely(action == TC_ACT_SHOT)) 590 goto drop; 591 592 update_flags = params->update_flags; 593 protocol = skb_protocol(skb, false); 594 again: 595 switch (protocol) { 596 case cpu_to_be16(ETH_P_IP): 597 if (!tcf_csum_ipv4(skb, update_flags)) 598 goto drop; 599 break; 600 case cpu_to_be16(ETH_P_IPV6): 601 if (!tcf_csum_ipv6(skb, update_flags)) 602 goto drop; 603 break; 604 case cpu_to_be16(ETH_P_8021AD): 605 fallthrough; 606 case cpu_to_be16(ETH_P_8021Q): 607 if (skb_vlan_tag_present(skb) && !orig_vlan_tag_present) { 608 protocol = skb->protocol; 609 orig_vlan_tag_present = true; 610 } else { 611 struct vlan_hdr *vlan; 612 613 if (!pskb_may_pull(skb, VLAN_HLEN)) 614 goto drop; 615 616 vlan = (struct vlan_hdr *)skb->data; 617 protocol = vlan->h_vlan_encapsulated_proto; 618 skb_pull(skb, VLAN_HLEN); 619 skb_reset_network_header(skb); 620 vlan_hdr_count++; 621 } 622 goto again; 623 } 624 625 out: 626 /* Restore the skb for the pulled VLAN tags */ 627 while (vlan_hdr_count--) { 628 skb_push(skb, VLAN_HLEN); 629 skb_reset_network_header(skb); 630 } 631 632 return action; 633 634 drop: 635 tcf_action_inc_drop_qstats(&p->common); 636 action = TC_ACT_SHOT; 637 goto out; 638 } 639 640 static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind, 641 int ref) 642 { 643 const struct tcf_csum *p = to_tcf_csum(a); 644 unsigned char *b = skb_tail_pointer(skb); 645 const struct tcf_csum_params *params; 646 struct tc_csum opt = { 647 .index = p->tcf_index, 648 .refcnt = refcount_read(&p->tcf_refcnt) - ref, 649 .bindcnt = atomic_read(&p->tcf_bindcnt) - bind, 650 }; 651 struct tcf_t t; 652 653 rcu_read_lock(); 654 params = rcu_dereference(p->params); 655 opt.action = params->action; 656 opt.update_flags = params->update_flags; 657 658 if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt)) 659 goto nla_put_failure; 660 661 tcf_tm_dump(&t, &p->tcf_tm); 662 if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD)) 663 goto nla_put_failure; 664 rcu_read_unlock(); 665 666 return skb->len; 667 668 nla_put_failure: 669 rcu_read_unlock(); 670 nlmsg_trim(skb, b); 671 return -1; 672 } 673 674 static void tcf_csum_cleanup(struct tc_action *a) 675 { 676 struct tcf_csum *p = to_tcf_csum(a); 677 struct tcf_csum_params *params; 678 679 params = rcu_dereference_protected(p->params, 1); 680 if (params) 681 kfree_rcu(params, rcu); 682 } 683 684 static size_t tcf_csum_get_fill_size(const struct tc_action *act) 685 { 686 return nla_total_size(sizeof(struct tc_csum)); 687 } 688 689 static int tcf_csum_offload_act_setup(struct tc_action *act, void *entry_data, 690 u32 *index_inc, bool bind, 691 struct netlink_ext_ack *extack) 692 { 693 if (bind) { 694 struct flow_action_entry *entry = entry_data; 695 696 entry->id = FLOW_ACTION_CSUM; 697 entry->csum_flags = tcf_csum_update_flags(act); 698 *index_inc = 1; 699 } else { 700 struct flow_offload_action *fl_action = entry_data; 701 702 fl_action->id = FLOW_ACTION_CSUM; 703 } 704 705 return 0; 706 } 707 708 static struct tc_action_ops act_csum_ops = { 709 .kind = "csum", 710 .id = TCA_ID_CSUM, 711 .owner = THIS_MODULE, 712 .act = tcf_csum_act, 713 .dump = tcf_csum_dump, 714 .init = tcf_csum_init, 715 .cleanup = tcf_csum_cleanup, 716 .get_fill_size = tcf_csum_get_fill_size, 717 .offload_act_setup = tcf_csum_offload_act_setup, 718 .size = sizeof(struct tcf_csum), 719 }; 720 MODULE_ALIAS_NET_ACT("csum"); 721 722 static __net_init int csum_init_net(struct net *net) 723 { 724 struct tc_action_net *tn = net_generic(net, act_csum_ops.net_id); 725 726 return tc_action_net_init(net, tn, &act_csum_ops); 727 } 728 729 static void __net_exit csum_exit_net(struct list_head *net_list) 730 { 731 tc_action_net_exit(net_list, act_csum_ops.net_id); 732 } 733 734 static struct pernet_operations csum_net_ops = { 735 .init = csum_init_net, 736 .exit_batch = csum_exit_net, 737 .id = &act_csum_ops.net_id, 738 .size = sizeof(struct tc_action_net), 739 }; 740 741 MODULE_DESCRIPTION("Checksum updating actions"); 742 MODULE_LICENSE("GPL"); 743 744 static int __init csum_init_module(void) 745 { 746 return tcf_register_action(&act_csum_ops, &csum_net_ops); 747 } 748 749 static void __exit csum_cleanup_module(void) 750 { 751 tcf_unregister_action(&act_csum_ops, &csum_net_ops); 752 } 753 754 module_init(csum_init_module); 755 module_exit(csum_cleanup_module); 756