1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * XFRM virtual interface 4 * 5 * Copyright (C) 2018 secunet Security Networks AG 6 * 7 * Author: 8 * Steffen Klassert <steffen.klassert@secunet.com> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/capability.h> 13 #include <linux/errno.h> 14 #include <linux/types.h> 15 #include <linux/sockios.h> 16 #include <linux/icmp.h> 17 #include <linux/if.h> 18 #include <linux/in.h> 19 #include <linux/ip.h> 20 #include <linux/net.h> 21 #include <linux/in6.h> 22 #include <linux/netdevice.h> 23 #include <linux/if_link.h> 24 #include <linux/if_arp.h> 25 #include <linux/icmpv6.h> 26 #include <linux/init.h> 27 #include <linux/route.h> 28 #include <linux/rtnetlink.h> 29 #include <linux/netfilter_ipv6.h> 30 #include <linux/slab.h> 31 #include <linux/hash.h> 32 33 #include <linux/uaccess.h> 34 #include <linux/atomic.h> 35 36 #include <net/icmp.h> 37 #include <net/ip.h> 38 #include <net/ipv6.h> 39 #include <net/ip6_route.h> 40 #include <net/ip_tunnels.h> 41 #include <net/addrconf.h> 42 #include <net/xfrm.h> 43 #include <net/net_namespace.h> 44 #include <net/dst_metadata.h> 45 #include <net/netns/generic.h> 46 #include <linux/etherdevice.h> 47 48 static int xfrmi_dev_init(struct net_device *dev); 49 static void xfrmi_dev_setup(struct net_device *dev); 50 static struct rtnl_link_ops xfrmi_link_ops __read_mostly; 51 static unsigned int xfrmi_net_id __read_mostly; 52 static const struct net_device_ops xfrmi_netdev_ops; 53 54 #define XFRMI_HASH_BITS 8 55 #define XFRMI_HASH_SIZE BIT(XFRMI_HASH_BITS) 56 57 struct xfrmi_net { 58 /* lists for storing interfaces in use */ 59 struct xfrm_if __rcu *xfrmi[XFRMI_HASH_SIZE]; 60 struct xfrm_if __rcu *collect_md_xfrmi; 61 }; 62 63 static const struct nla_policy xfrm_lwt_policy[LWT_XFRM_MAX + 1] = { 64 [LWT_XFRM_IF_ID] = NLA_POLICY_MIN(NLA_U32, 1), 65 [LWT_XFRM_LINK] = NLA_POLICY_MIN(NLA_U32, 1), 66 }; 67 68 static void xfrmi_destroy_state(struct lwtunnel_state *lwt) 69 { 70 } 71 72 static int xfrmi_build_state(struct net *net, struct nlattr *nla, 73 unsigned int family, const void *cfg, 74 struct lwtunnel_state **ts, 75 struct netlink_ext_ack *extack) 76 { 77 struct nlattr *tb[LWT_XFRM_MAX + 1]; 78 struct lwtunnel_state *new_state; 79 struct xfrm_md_info *info; 80 int ret; 81 82 ret = nla_parse_nested(tb, LWT_XFRM_MAX, nla, xfrm_lwt_policy, extack); 83 if (ret < 0) 84 return ret; 85 86 if (!tb[LWT_XFRM_IF_ID]) { 87 NL_SET_ERR_MSG(extack, "if_id must be set"); 88 return -EINVAL; 89 } 90 91 new_state = lwtunnel_state_alloc(sizeof(*info)); 92 if (!new_state) { 93 NL_SET_ERR_MSG(extack, "failed to create encap info"); 94 return -ENOMEM; 95 } 96 97 new_state->type = LWTUNNEL_ENCAP_XFRM; 98 99 info = lwt_xfrm_info(new_state); 100 101 info->if_id = nla_get_u32(tb[LWT_XFRM_IF_ID]); 102 103 if (tb[LWT_XFRM_LINK]) 104 info->link = nla_get_u32(tb[LWT_XFRM_LINK]); 105 106 *ts = new_state; 107 return 0; 108 } 109 110 static int xfrmi_fill_encap_info(struct sk_buff *skb, 111 struct lwtunnel_state *lwt) 112 { 113 struct xfrm_md_info *info = lwt_xfrm_info(lwt); 114 115 if (nla_put_u32(skb, LWT_XFRM_IF_ID, info->if_id) || 116 (info->link && nla_put_u32(skb, LWT_XFRM_LINK, info->link))) 117 return -EMSGSIZE; 118 119 return 0; 120 } 121 122 static int xfrmi_encap_nlsize(struct lwtunnel_state *lwtstate) 123 { 124 return nla_total_size(sizeof(u32)) + /* LWT_XFRM_IF_ID */ 125 nla_total_size(sizeof(u32)); /* LWT_XFRM_LINK */ 126 } 127 128 static int xfrmi_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b) 129 { 130 struct xfrm_md_info *a_info = lwt_xfrm_info(a); 131 struct xfrm_md_info *b_info = lwt_xfrm_info(b); 132 133 return memcmp(a_info, b_info, sizeof(*a_info)); 134 } 135 136 static const struct lwtunnel_encap_ops xfrmi_encap_ops = { 137 .build_state = xfrmi_build_state, 138 .destroy_state = xfrmi_destroy_state, 139 .fill_encap = xfrmi_fill_encap_info, 140 .get_encap_size = xfrmi_encap_nlsize, 141 .cmp_encap = xfrmi_encap_cmp, 142 .owner = THIS_MODULE, 143 }; 144 145 #define for_each_xfrmi_rcu(start, xi) \ 146 for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next)) 147 148 static u32 xfrmi_hash(u32 if_id) 149 { 150 return hash_32(if_id, XFRMI_HASH_BITS); 151 } 152 153 static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x) 154 { 155 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 156 struct xfrm_if *xi; 157 158 for_each_xfrmi_rcu(xfrmn->xfrmi[xfrmi_hash(x->if_id)], xi) { 159 if (x->if_id == xi->p.if_id && 160 (xi->dev->flags & IFF_UP)) 161 return xi; 162 } 163 164 xi = rcu_dereference(xfrmn->collect_md_xfrmi); 165 if (xi && (xi->dev->flags & IFF_UP)) 166 return xi; 167 168 return NULL; 169 } 170 171 static bool xfrmi_decode_session(struct sk_buff *skb, 172 unsigned short family, 173 struct xfrm_if_decode_session_result *res) 174 { 175 struct net_device *dev; 176 struct xfrm_if *xi; 177 int ifindex = 0; 178 179 if (!secpath_exists(skb) || !skb->dev) 180 return false; 181 182 switch (family) { 183 case AF_INET6: 184 ifindex = inet6_sdif(skb); 185 break; 186 case AF_INET: 187 ifindex = inet_sdif(skb); 188 break; 189 } 190 191 if (ifindex) { 192 struct net *net = xs_net(xfrm_input_state(skb)); 193 194 dev = dev_get_by_index_rcu(net, ifindex); 195 } else { 196 dev = skb->dev; 197 } 198 199 if (!dev || !(dev->flags & IFF_UP)) 200 return false; 201 if (dev->netdev_ops != &xfrmi_netdev_ops) 202 return false; 203 204 xi = netdev_priv(dev); 205 res->net = xi->net; 206 207 if (xi->p.collect_md) 208 res->if_id = xfrm_input_state(skb)->if_id; 209 else 210 res->if_id = xi->p.if_id; 211 return true; 212 } 213 214 static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi) 215 { 216 struct xfrm_if __rcu **xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)]; 217 218 rcu_assign_pointer(xi->next , rtnl_dereference(*xip)); 219 rcu_assign_pointer(*xip, xi); 220 } 221 222 static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi) 223 { 224 struct xfrm_if __rcu **xip; 225 struct xfrm_if *iter; 226 227 for (xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)]; 228 (iter = rtnl_dereference(*xip)) != NULL; 229 xip = &iter->next) { 230 if (xi == iter) { 231 rcu_assign_pointer(*xip, xi->next); 232 break; 233 } 234 } 235 } 236 237 static void xfrmi_dev_free(struct net_device *dev) 238 { 239 struct xfrm_if *xi = netdev_priv(dev); 240 241 gro_cells_destroy(&xi->gro_cells); 242 free_percpu(dev->tstats); 243 } 244 245 static int xfrmi_create(struct net_device *dev) 246 { 247 struct xfrm_if *xi = netdev_priv(dev); 248 struct net *net = dev_net(dev); 249 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 250 int err; 251 252 dev->rtnl_link_ops = &xfrmi_link_ops; 253 err = register_netdevice(dev); 254 if (err < 0) 255 goto out; 256 257 if (xi->p.collect_md) 258 rcu_assign_pointer(xfrmn->collect_md_xfrmi, xi); 259 else 260 xfrmi_link(xfrmn, xi); 261 262 return 0; 263 264 out: 265 return err; 266 } 267 268 static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p) 269 { 270 struct xfrm_if __rcu **xip; 271 struct xfrm_if *xi; 272 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 273 274 for (xip = &xfrmn->xfrmi[xfrmi_hash(p->if_id)]; 275 (xi = rtnl_dereference(*xip)) != NULL; 276 xip = &xi->next) 277 if (xi->p.if_id == p->if_id) 278 return xi; 279 280 return NULL; 281 } 282 283 static void xfrmi_dev_uninit(struct net_device *dev) 284 { 285 struct xfrm_if *xi = netdev_priv(dev); 286 struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id); 287 288 if (xi->p.collect_md) 289 RCU_INIT_POINTER(xfrmn->collect_md_xfrmi, NULL); 290 else 291 xfrmi_unlink(xfrmn, xi); 292 } 293 294 static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet) 295 { 296 skb_clear_tstamp(skb); 297 skb->pkt_type = PACKET_HOST; 298 skb->skb_iif = 0; 299 skb->ignore_df = 0; 300 skb_dst_drop(skb); 301 nf_reset_ct(skb); 302 nf_reset_trace(skb); 303 304 if (!xnet) 305 return; 306 307 ipvs_reset(skb); 308 secpath_reset(skb); 309 skb_orphan(skb); 310 skb->mark = 0; 311 } 312 313 static int xfrmi_rcv_cb(struct sk_buff *skb, int err) 314 { 315 const struct xfrm_mode *inner_mode; 316 struct net_device *dev; 317 struct xfrm_state *x; 318 struct xfrm_if *xi; 319 bool xnet; 320 int link; 321 322 if (err && !secpath_exists(skb)) 323 return 0; 324 325 x = xfrm_input_state(skb); 326 327 xi = xfrmi_lookup(xs_net(x), x); 328 if (!xi) 329 return 1; 330 331 link = skb->dev->ifindex; 332 dev = xi->dev; 333 skb->dev = dev; 334 335 if (err) { 336 dev->stats.rx_errors++; 337 dev->stats.rx_dropped++; 338 339 return 0; 340 } 341 342 xnet = !net_eq(xi->net, dev_net(skb->dev)); 343 344 if (xnet) { 345 inner_mode = &x->inner_mode; 346 347 if (x->sel.family == AF_UNSPEC) { 348 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 349 if (inner_mode == NULL) { 350 XFRM_INC_STATS(dev_net(skb->dev), 351 LINUX_MIB_XFRMINSTATEMODEERROR); 352 return -EINVAL; 353 } 354 } 355 356 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, 357 inner_mode->family)) 358 return -EPERM; 359 } 360 361 xfrmi_scrub_packet(skb, xnet); 362 if (xi->p.collect_md) { 363 struct metadata_dst *md_dst; 364 365 md_dst = metadata_dst_alloc(0, METADATA_XFRM, GFP_ATOMIC); 366 if (!md_dst) 367 return -ENOMEM; 368 369 md_dst->u.xfrm_info.if_id = x->if_id; 370 md_dst->u.xfrm_info.link = link; 371 skb_dst_set(skb, (struct dst_entry *)md_dst); 372 } 373 dev_sw_netstats_rx_add(dev, skb->len); 374 375 return 0; 376 } 377 378 static int 379 xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) 380 { 381 struct xfrm_if *xi = netdev_priv(dev); 382 struct net_device_stats *stats = &xi->dev->stats; 383 struct dst_entry *dst = skb_dst(skb); 384 unsigned int length = skb->len; 385 struct net_device *tdev; 386 struct xfrm_state *x; 387 int err = -1; 388 u32 if_id; 389 int mtu; 390 391 if (xi->p.collect_md) { 392 struct xfrm_md_info *md_info = skb_xfrm_md_info(skb); 393 394 if (unlikely(!md_info)) 395 return -EINVAL; 396 397 if_id = md_info->if_id; 398 fl->flowi_oif = md_info->link; 399 if (md_info->dst_orig) { 400 struct dst_entry *tmp_dst = dst; 401 402 dst = md_info->dst_orig; 403 skb_dst_set(skb, dst); 404 md_info->dst_orig = NULL; 405 dst_release(tmp_dst); 406 } 407 } else { 408 if_id = xi->p.if_id; 409 } 410 411 dst_hold(dst); 412 dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, if_id); 413 if (IS_ERR(dst)) { 414 err = PTR_ERR(dst); 415 dst = NULL; 416 goto tx_err_link_failure; 417 } 418 419 x = dst->xfrm; 420 if (!x) 421 goto tx_err_link_failure; 422 423 if (x->if_id != if_id) 424 goto tx_err_link_failure; 425 426 tdev = dst->dev; 427 428 if (tdev == dev) { 429 stats->collisions++; 430 net_warn_ratelimited("%s: Local routing loop detected!\n", 431 dev->name); 432 goto tx_err_dst_release; 433 } 434 435 mtu = dst_mtu(dst); 436 if ((!skb_is_gso(skb) && skb->len > mtu) || 437 (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu))) { 438 skb_dst_update_pmtu_no_confirm(skb, mtu); 439 440 if (skb->protocol == htons(ETH_P_IPV6)) { 441 if (mtu < IPV6_MIN_MTU) 442 mtu = IPV6_MIN_MTU; 443 444 if (skb->len > 1280) 445 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 446 else 447 goto xmit; 448 } else { 449 if (!(ip_hdr(skb)->frag_off & htons(IP_DF))) 450 goto xmit; 451 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 452 htonl(mtu)); 453 } 454 455 dst_release(dst); 456 return -EMSGSIZE; 457 } 458 459 xmit: 460 xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev))); 461 skb_dst_set(skb, dst); 462 skb->dev = tdev; 463 464 err = dst_output(xi->net, skb->sk, skb); 465 if (net_xmit_eval(err) == 0) { 466 dev_sw_netstats_tx_add(dev, 1, length); 467 } else { 468 stats->tx_errors++; 469 stats->tx_aborted_errors++; 470 } 471 472 return 0; 473 tx_err_link_failure: 474 stats->tx_carrier_errors++; 475 dst_link_failure(skb); 476 tx_err_dst_release: 477 dst_release(dst); 478 return err; 479 } 480 481 static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev) 482 { 483 struct xfrm_if *xi = netdev_priv(dev); 484 struct net_device_stats *stats = &xi->dev->stats; 485 struct dst_entry *dst = skb_dst(skb); 486 struct flowi fl; 487 int ret; 488 489 memset(&fl, 0, sizeof(fl)); 490 491 switch (skb->protocol) { 492 case htons(ETH_P_IPV6): 493 xfrm_decode_session(skb, &fl, AF_INET6); 494 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); 495 if (!dst) { 496 fl.u.ip6.flowi6_oif = dev->ifindex; 497 fl.u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; 498 dst = ip6_route_output(dev_net(dev), NULL, &fl.u.ip6); 499 if (dst->error) { 500 dst_release(dst); 501 stats->tx_carrier_errors++; 502 goto tx_err; 503 } 504 skb_dst_set(skb, dst); 505 } 506 break; 507 case htons(ETH_P_IP): 508 xfrm_decode_session(skb, &fl, AF_INET); 509 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 510 if (!dst) { 511 struct rtable *rt; 512 513 fl.u.ip4.flowi4_oif = dev->ifindex; 514 fl.u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; 515 rt = __ip_route_output_key(dev_net(dev), &fl.u.ip4); 516 if (IS_ERR(rt)) { 517 stats->tx_carrier_errors++; 518 goto tx_err; 519 } 520 skb_dst_set(skb, &rt->dst); 521 } 522 break; 523 default: 524 goto tx_err; 525 } 526 527 fl.flowi_oif = xi->p.link; 528 529 ret = xfrmi_xmit2(skb, dev, &fl); 530 if (ret < 0) 531 goto tx_err; 532 533 return NETDEV_TX_OK; 534 535 tx_err: 536 stats->tx_errors++; 537 stats->tx_dropped++; 538 kfree_skb(skb); 539 return NETDEV_TX_OK; 540 } 541 542 static int xfrmi4_err(struct sk_buff *skb, u32 info) 543 { 544 const struct iphdr *iph = (const struct iphdr *)skb->data; 545 struct net *net = dev_net(skb->dev); 546 int protocol = iph->protocol; 547 struct ip_comp_hdr *ipch; 548 struct ip_esp_hdr *esph; 549 struct ip_auth_hdr *ah ; 550 struct xfrm_state *x; 551 struct xfrm_if *xi; 552 __be32 spi; 553 554 switch (protocol) { 555 case IPPROTO_ESP: 556 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); 557 spi = esph->spi; 558 break; 559 case IPPROTO_AH: 560 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); 561 spi = ah->spi; 562 break; 563 case IPPROTO_COMP: 564 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); 565 spi = htonl(ntohs(ipch->cpi)); 566 break; 567 default: 568 return 0; 569 } 570 571 switch (icmp_hdr(skb)->type) { 572 case ICMP_DEST_UNREACH: 573 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) 574 return 0; 575 break; 576 case ICMP_REDIRECT: 577 break; 578 default: 579 return 0; 580 } 581 582 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, 583 spi, protocol, AF_INET); 584 if (!x) 585 return 0; 586 587 xi = xfrmi_lookup(net, x); 588 if (!xi) { 589 xfrm_state_put(x); 590 return -1; 591 } 592 593 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) 594 ipv4_update_pmtu(skb, net, info, 0, protocol); 595 else 596 ipv4_redirect(skb, net, 0, protocol); 597 xfrm_state_put(x); 598 599 return 0; 600 } 601 602 static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 603 u8 type, u8 code, int offset, __be32 info) 604 { 605 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; 606 struct net *net = dev_net(skb->dev); 607 int protocol = iph->nexthdr; 608 struct ip_comp_hdr *ipch; 609 struct ip_esp_hdr *esph; 610 struct ip_auth_hdr *ah; 611 struct xfrm_state *x; 612 struct xfrm_if *xi; 613 __be32 spi; 614 615 switch (protocol) { 616 case IPPROTO_ESP: 617 esph = (struct ip_esp_hdr *)(skb->data + offset); 618 spi = esph->spi; 619 break; 620 case IPPROTO_AH: 621 ah = (struct ip_auth_hdr *)(skb->data + offset); 622 spi = ah->spi; 623 break; 624 case IPPROTO_COMP: 625 ipch = (struct ip_comp_hdr *)(skb->data + offset); 626 spi = htonl(ntohs(ipch->cpi)); 627 break; 628 default: 629 return 0; 630 } 631 632 if (type != ICMPV6_PKT_TOOBIG && 633 type != NDISC_REDIRECT) 634 return 0; 635 636 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, 637 spi, protocol, AF_INET6); 638 if (!x) 639 return 0; 640 641 xi = xfrmi_lookup(net, x); 642 if (!xi) { 643 xfrm_state_put(x); 644 return -1; 645 } 646 647 if (type == NDISC_REDIRECT) 648 ip6_redirect(skb, net, skb->dev->ifindex, 0, 649 sock_net_uid(net, NULL)); 650 else 651 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 652 xfrm_state_put(x); 653 654 return 0; 655 } 656 657 static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) 658 { 659 if (xi->p.link != p->link) 660 return -EINVAL; 661 662 xi->p.if_id = p->if_id; 663 664 return 0; 665 } 666 667 static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) 668 { 669 struct net *net = xi->net; 670 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 671 int err; 672 673 xfrmi_unlink(xfrmn, xi); 674 synchronize_net(); 675 err = xfrmi_change(xi, p); 676 xfrmi_link(xfrmn, xi); 677 netdev_state_change(xi->dev); 678 return err; 679 } 680 681 static int xfrmi_get_iflink(const struct net_device *dev) 682 { 683 struct xfrm_if *xi = netdev_priv(dev); 684 685 return xi->p.link; 686 } 687 688 static const struct net_device_ops xfrmi_netdev_ops = { 689 .ndo_init = xfrmi_dev_init, 690 .ndo_uninit = xfrmi_dev_uninit, 691 .ndo_start_xmit = xfrmi_xmit, 692 .ndo_get_stats64 = dev_get_tstats64, 693 .ndo_get_iflink = xfrmi_get_iflink, 694 }; 695 696 static void xfrmi_dev_setup(struct net_device *dev) 697 { 698 dev->netdev_ops = &xfrmi_netdev_ops; 699 dev->header_ops = &ip_tunnel_header_ops; 700 dev->type = ARPHRD_NONE; 701 dev->mtu = ETH_DATA_LEN; 702 dev->min_mtu = ETH_MIN_MTU; 703 dev->max_mtu = IP_MAX_MTU; 704 dev->flags = IFF_NOARP; 705 dev->needs_free_netdev = true; 706 dev->priv_destructor = xfrmi_dev_free; 707 netif_keep_dst(dev); 708 709 eth_broadcast_addr(dev->broadcast); 710 } 711 712 #define XFRMI_FEATURES (NETIF_F_SG | \ 713 NETIF_F_FRAGLIST | \ 714 NETIF_F_GSO_SOFTWARE | \ 715 NETIF_F_HW_CSUM) 716 717 static int xfrmi_dev_init(struct net_device *dev) 718 { 719 struct xfrm_if *xi = netdev_priv(dev); 720 struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link); 721 int err; 722 723 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 724 if (!dev->tstats) 725 return -ENOMEM; 726 727 err = gro_cells_init(&xi->gro_cells, dev); 728 if (err) { 729 free_percpu(dev->tstats); 730 return err; 731 } 732 733 dev->features |= NETIF_F_LLTX; 734 dev->features |= XFRMI_FEATURES; 735 dev->hw_features |= XFRMI_FEATURES; 736 737 if (phydev) { 738 dev->needed_headroom = phydev->needed_headroom; 739 dev->needed_tailroom = phydev->needed_tailroom; 740 741 if (is_zero_ether_addr(dev->dev_addr)) 742 eth_hw_addr_inherit(dev, phydev); 743 if (is_zero_ether_addr(dev->broadcast)) 744 memcpy(dev->broadcast, phydev->broadcast, 745 dev->addr_len); 746 } else { 747 eth_hw_addr_random(dev); 748 eth_broadcast_addr(dev->broadcast); 749 } 750 751 return 0; 752 } 753 754 static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[], 755 struct netlink_ext_ack *extack) 756 { 757 return 0; 758 } 759 760 static void xfrmi_netlink_parms(struct nlattr *data[], 761 struct xfrm_if_parms *parms) 762 { 763 memset(parms, 0, sizeof(*parms)); 764 765 if (!data) 766 return; 767 768 if (data[IFLA_XFRM_LINK]) 769 parms->link = nla_get_u32(data[IFLA_XFRM_LINK]); 770 771 if (data[IFLA_XFRM_IF_ID]) 772 parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]); 773 774 if (data[IFLA_XFRM_COLLECT_METADATA]) 775 parms->collect_md = true; 776 } 777 778 static int xfrmi_newlink(struct net *src_net, struct net_device *dev, 779 struct nlattr *tb[], struct nlattr *data[], 780 struct netlink_ext_ack *extack) 781 { 782 struct net *net = dev_net(dev); 783 struct xfrm_if_parms p = {}; 784 struct xfrm_if *xi; 785 int err; 786 787 xfrmi_netlink_parms(data, &p); 788 if (p.collect_md) { 789 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 790 791 if (p.link || p.if_id) { 792 NL_SET_ERR_MSG(extack, "link and if_id must be zero"); 793 return -EINVAL; 794 } 795 796 if (rtnl_dereference(xfrmn->collect_md_xfrmi)) 797 return -EEXIST; 798 799 } else { 800 if (!p.if_id) { 801 NL_SET_ERR_MSG(extack, "if_id must be non zero"); 802 return -EINVAL; 803 } 804 805 xi = xfrmi_locate(net, &p); 806 if (xi) 807 return -EEXIST; 808 } 809 810 xi = netdev_priv(dev); 811 xi->p = p; 812 xi->net = net; 813 xi->dev = dev; 814 815 err = xfrmi_create(dev); 816 return err; 817 } 818 819 static void xfrmi_dellink(struct net_device *dev, struct list_head *head) 820 { 821 unregister_netdevice_queue(dev, head); 822 } 823 824 static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], 825 struct nlattr *data[], 826 struct netlink_ext_ack *extack) 827 { 828 struct xfrm_if *xi = netdev_priv(dev); 829 struct net *net = xi->net; 830 struct xfrm_if_parms p = {}; 831 832 xfrmi_netlink_parms(data, &p); 833 if (!p.if_id) { 834 NL_SET_ERR_MSG(extack, "if_id must be non zero"); 835 return -EINVAL; 836 } 837 838 if (p.collect_md) { 839 NL_SET_ERR_MSG(extack, "collect_md can't be changed"); 840 return -EINVAL; 841 } 842 843 xi = xfrmi_locate(net, &p); 844 if (!xi) { 845 xi = netdev_priv(dev); 846 } else { 847 if (xi->dev != dev) 848 return -EEXIST; 849 if (xi->p.collect_md) { 850 NL_SET_ERR_MSG(extack, 851 "device can't be changed to collect_md"); 852 return -EINVAL; 853 } 854 } 855 856 return xfrmi_update(xi, &p); 857 } 858 859 static size_t xfrmi_get_size(const struct net_device *dev) 860 { 861 return 862 /* IFLA_XFRM_LINK */ 863 nla_total_size(4) + 864 /* IFLA_XFRM_IF_ID */ 865 nla_total_size(4) + 866 /* IFLA_XFRM_COLLECT_METADATA */ 867 nla_total_size(0) + 868 0; 869 } 870 871 static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev) 872 { 873 struct xfrm_if *xi = netdev_priv(dev); 874 struct xfrm_if_parms *parm = &xi->p; 875 876 if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) || 877 nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id) || 878 (xi->p.collect_md && nla_put_flag(skb, IFLA_XFRM_COLLECT_METADATA))) 879 goto nla_put_failure; 880 return 0; 881 882 nla_put_failure: 883 return -EMSGSIZE; 884 } 885 886 static struct net *xfrmi_get_link_net(const struct net_device *dev) 887 { 888 struct xfrm_if *xi = netdev_priv(dev); 889 890 return xi->net; 891 } 892 893 static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { 894 [IFLA_XFRM_UNSPEC] = { .strict_start_type = IFLA_XFRM_COLLECT_METADATA }, 895 [IFLA_XFRM_LINK] = { .type = NLA_U32 }, 896 [IFLA_XFRM_IF_ID] = { .type = NLA_U32 }, 897 [IFLA_XFRM_COLLECT_METADATA] = { .type = NLA_FLAG }, 898 }; 899 900 static struct rtnl_link_ops xfrmi_link_ops __read_mostly = { 901 .kind = "xfrm", 902 .maxtype = IFLA_XFRM_MAX, 903 .policy = xfrmi_policy, 904 .priv_size = sizeof(struct xfrm_if), 905 .setup = xfrmi_dev_setup, 906 .validate = xfrmi_validate, 907 .newlink = xfrmi_newlink, 908 .dellink = xfrmi_dellink, 909 .changelink = xfrmi_changelink, 910 .get_size = xfrmi_get_size, 911 .fill_info = xfrmi_fill_info, 912 .get_link_net = xfrmi_get_link_net, 913 }; 914 915 static void __net_exit xfrmi_exit_batch_net(struct list_head *net_exit_list) 916 { 917 struct net *net; 918 LIST_HEAD(list); 919 920 rtnl_lock(); 921 list_for_each_entry(net, net_exit_list, exit_list) { 922 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 923 struct xfrm_if __rcu **xip; 924 struct xfrm_if *xi; 925 int i; 926 927 for (i = 0; i < XFRMI_HASH_SIZE; i++) { 928 for (xip = &xfrmn->xfrmi[i]; 929 (xi = rtnl_dereference(*xip)) != NULL; 930 xip = &xi->next) 931 unregister_netdevice_queue(xi->dev, &list); 932 } 933 xi = rtnl_dereference(xfrmn->collect_md_xfrmi); 934 if (xi) 935 unregister_netdevice_queue(xi->dev, &list); 936 } 937 unregister_netdevice_many(&list); 938 rtnl_unlock(); 939 } 940 941 static struct pernet_operations xfrmi_net_ops = { 942 .exit_batch = xfrmi_exit_batch_net, 943 .id = &xfrmi_net_id, 944 .size = sizeof(struct xfrmi_net), 945 }; 946 947 static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = { 948 .handler = xfrm6_rcv, 949 .input_handler = xfrm_input, 950 .cb_handler = xfrmi_rcv_cb, 951 .err_handler = xfrmi6_err, 952 .priority = 10, 953 }; 954 955 static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = { 956 .handler = xfrm6_rcv, 957 .input_handler = xfrm_input, 958 .cb_handler = xfrmi_rcv_cb, 959 .err_handler = xfrmi6_err, 960 .priority = 10, 961 }; 962 963 static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = { 964 .handler = xfrm6_rcv, 965 .input_handler = xfrm_input, 966 .cb_handler = xfrmi_rcv_cb, 967 .err_handler = xfrmi6_err, 968 .priority = 10, 969 }; 970 971 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) 972 static int xfrmi6_rcv_tunnel(struct sk_buff *skb) 973 { 974 const xfrm_address_t *saddr; 975 __be32 spi; 976 977 saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr; 978 spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr); 979 980 return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL); 981 } 982 983 static struct xfrm6_tunnel xfrmi_ipv6_handler __read_mostly = { 984 .handler = xfrmi6_rcv_tunnel, 985 .cb_handler = xfrmi_rcv_cb, 986 .err_handler = xfrmi6_err, 987 .priority = 2, 988 }; 989 990 static struct xfrm6_tunnel xfrmi_ip6ip_handler __read_mostly = { 991 .handler = xfrmi6_rcv_tunnel, 992 .cb_handler = xfrmi_rcv_cb, 993 .err_handler = xfrmi6_err, 994 .priority = 2, 995 }; 996 #endif 997 998 static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = { 999 .handler = xfrm4_rcv, 1000 .input_handler = xfrm_input, 1001 .cb_handler = xfrmi_rcv_cb, 1002 .err_handler = xfrmi4_err, 1003 .priority = 10, 1004 }; 1005 1006 static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = { 1007 .handler = xfrm4_rcv, 1008 .input_handler = xfrm_input, 1009 .cb_handler = xfrmi_rcv_cb, 1010 .err_handler = xfrmi4_err, 1011 .priority = 10, 1012 }; 1013 1014 static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = { 1015 .handler = xfrm4_rcv, 1016 .input_handler = xfrm_input, 1017 .cb_handler = xfrmi_rcv_cb, 1018 .err_handler = xfrmi4_err, 1019 .priority = 10, 1020 }; 1021 1022 #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) 1023 static int xfrmi4_rcv_tunnel(struct sk_buff *skb) 1024 { 1025 return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr); 1026 } 1027 1028 static struct xfrm_tunnel xfrmi_ipip_handler __read_mostly = { 1029 .handler = xfrmi4_rcv_tunnel, 1030 .cb_handler = xfrmi_rcv_cb, 1031 .err_handler = xfrmi4_err, 1032 .priority = 3, 1033 }; 1034 1035 static struct xfrm_tunnel xfrmi_ipip6_handler __read_mostly = { 1036 .handler = xfrmi4_rcv_tunnel, 1037 .cb_handler = xfrmi_rcv_cb, 1038 .err_handler = xfrmi4_err, 1039 .priority = 2, 1040 }; 1041 #endif 1042 1043 static int __init xfrmi4_init(void) 1044 { 1045 int err; 1046 1047 err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP); 1048 if (err < 0) 1049 goto xfrm_proto_esp_failed; 1050 err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH); 1051 if (err < 0) 1052 goto xfrm_proto_ah_failed; 1053 err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); 1054 if (err < 0) 1055 goto xfrm_proto_comp_failed; 1056 #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) 1057 err = xfrm4_tunnel_register(&xfrmi_ipip_handler, AF_INET); 1058 if (err < 0) 1059 goto xfrm_tunnel_ipip_failed; 1060 err = xfrm4_tunnel_register(&xfrmi_ipip6_handler, AF_INET6); 1061 if (err < 0) 1062 goto xfrm_tunnel_ipip6_failed; 1063 #endif 1064 1065 return 0; 1066 1067 #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) 1068 xfrm_tunnel_ipip6_failed: 1069 xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET); 1070 xfrm_tunnel_ipip_failed: 1071 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); 1072 #endif 1073 xfrm_proto_comp_failed: 1074 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); 1075 xfrm_proto_ah_failed: 1076 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); 1077 xfrm_proto_esp_failed: 1078 return err; 1079 } 1080 1081 static void xfrmi4_fini(void) 1082 { 1083 #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) 1084 xfrm4_tunnel_deregister(&xfrmi_ipip6_handler, AF_INET6); 1085 xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET); 1086 #endif 1087 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); 1088 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); 1089 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); 1090 } 1091 1092 static int __init xfrmi6_init(void) 1093 { 1094 int err; 1095 1096 err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP); 1097 if (err < 0) 1098 goto xfrm_proto_esp_failed; 1099 err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH); 1100 if (err < 0) 1101 goto xfrm_proto_ah_failed; 1102 err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); 1103 if (err < 0) 1104 goto xfrm_proto_comp_failed; 1105 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) 1106 err = xfrm6_tunnel_register(&xfrmi_ipv6_handler, AF_INET6); 1107 if (err < 0) 1108 goto xfrm_tunnel_ipv6_failed; 1109 err = xfrm6_tunnel_register(&xfrmi_ip6ip_handler, AF_INET); 1110 if (err < 0) 1111 goto xfrm_tunnel_ip6ip_failed; 1112 #endif 1113 1114 return 0; 1115 1116 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) 1117 xfrm_tunnel_ip6ip_failed: 1118 xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6); 1119 xfrm_tunnel_ipv6_failed: 1120 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); 1121 #endif 1122 xfrm_proto_comp_failed: 1123 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); 1124 xfrm_proto_ah_failed: 1125 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); 1126 xfrm_proto_esp_failed: 1127 return err; 1128 } 1129 1130 static void xfrmi6_fini(void) 1131 { 1132 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) 1133 xfrm6_tunnel_deregister(&xfrmi_ip6ip_handler, AF_INET); 1134 xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6); 1135 #endif 1136 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); 1137 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); 1138 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); 1139 } 1140 1141 static const struct xfrm_if_cb xfrm_if_cb = { 1142 .decode_session = xfrmi_decode_session, 1143 }; 1144 1145 static int __init xfrmi_init(void) 1146 { 1147 const char *msg; 1148 int err; 1149 1150 pr_info("IPsec XFRM device driver\n"); 1151 1152 msg = "tunnel device"; 1153 err = register_pernet_device(&xfrmi_net_ops); 1154 if (err < 0) 1155 goto pernet_dev_failed; 1156 1157 msg = "xfrm4 protocols"; 1158 err = xfrmi4_init(); 1159 if (err < 0) 1160 goto xfrmi4_failed; 1161 1162 msg = "xfrm6 protocols"; 1163 err = xfrmi6_init(); 1164 if (err < 0) 1165 goto xfrmi6_failed; 1166 1167 1168 msg = "netlink interface"; 1169 err = rtnl_link_register(&xfrmi_link_ops); 1170 if (err < 0) 1171 goto rtnl_link_failed; 1172 1173 err = register_xfrm_interface_bpf(); 1174 if (err < 0) 1175 goto kfunc_failed; 1176 1177 lwtunnel_encap_add_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM); 1178 1179 xfrm_if_register_cb(&xfrm_if_cb); 1180 1181 return err; 1182 1183 kfunc_failed: 1184 rtnl_link_unregister(&xfrmi_link_ops); 1185 rtnl_link_failed: 1186 xfrmi6_fini(); 1187 xfrmi6_failed: 1188 xfrmi4_fini(); 1189 xfrmi4_failed: 1190 unregister_pernet_device(&xfrmi_net_ops); 1191 pernet_dev_failed: 1192 pr_err("xfrmi init: failed to register %s\n", msg); 1193 return err; 1194 } 1195 1196 static void __exit xfrmi_fini(void) 1197 { 1198 xfrm_if_unregister_cb(); 1199 lwtunnel_encap_del_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM); 1200 rtnl_link_unregister(&xfrmi_link_ops); 1201 xfrmi4_fini(); 1202 xfrmi6_fini(); 1203 unregister_pernet_device(&xfrmi_net_ops); 1204 } 1205 1206 module_init(xfrmi_init); 1207 module_exit(xfrmi_fini); 1208 MODULE_LICENSE("GPL"); 1209 MODULE_ALIAS_RTNL_LINK("xfrm"); 1210 MODULE_ALIAS_NETDEV("xfrm0"); 1211 MODULE_AUTHOR("Steffen Klassert"); 1212 MODULE_DESCRIPTION("XFRM virtual interface"); 1213