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/gso.h> 37 #include <net/icmp.h> 38 #include <net/ip.h> 39 #include <net/ipv6.h> 40 #include <net/ip6_route.h> 41 #include <net/ip_tunnels.h> 42 #include <net/addrconf.h> 43 #include <net/xfrm.h> 44 #include <net/net_namespace.h> 45 #include <net/dst_metadata.h> 46 #include <net/netns/generic.h> 47 #include <linux/etherdevice.h> 48 49 static int xfrmi_dev_init(struct net_device *dev); 50 static void xfrmi_dev_setup(struct net_device *dev); 51 static struct rtnl_link_ops xfrmi_link_ops __read_mostly; 52 static unsigned int xfrmi_net_id __read_mostly; 53 static const struct net_device_ops xfrmi_netdev_ops; 54 55 #define XFRMI_HASH_BITS 8 56 #define XFRMI_HASH_SIZE BIT(XFRMI_HASH_BITS) 57 58 struct xfrmi_net { 59 /* lists for storing interfaces in use */ 60 struct xfrm_if __rcu *xfrmi[XFRMI_HASH_SIZE]; 61 struct xfrm_if __rcu *collect_md_xfrmi; 62 }; 63 64 static const struct nla_policy xfrm_lwt_policy[LWT_XFRM_MAX + 1] = { 65 [LWT_XFRM_IF_ID] = NLA_POLICY_MIN(NLA_U32, 1), 66 [LWT_XFRM_LINK] = NLA_POLICY_MIN(NLA_U32, 1), 67 }; 68 69 static void xfrmi_destroy_state(struct lwtunnel_state *lwt) 70 { 71 } 72 73 static int xfrmi_build_state(struct net *net, struct nlattr *nla, 74 unsigned int family, const void *cfg, 75 struct lwtunnel_state **ts, 76 struct netlink_ext_ack *extack) 77 { 78 struct nlattr *tb[LWT_XFRM_MAX + 1]; 79 struct lwtunnel_state *new_state; 80 struct xfrm_md_info *info; 81 int ret; 82 83 ret = nla_parse_nested(tb, LWT_XFRM_MAX, nla, xfrm_lwt_policy, extack); 84 if (ret < 0) 85 return ret; 86 87 if (!tb[LWT_XFRM_IF_ID]) { 88 NL_SET_ERR_MSG(extack, "if_id must be set"); 89 return -EINVAL; 90 } 91 92 new_state = lwtunnel_state_alloc(sizeof(*info)); 93 if (!new_state) { 94 NL_SET_ERR_MSG(extack, "failed to create encap info"); 95 return -ENOMEM; 96 } 97 98 new_state->type = LWTUNNEL_ENCAP_XFRM; 99 100 info = lwt_xfrm_info(new_state); 101 102 info->if_id = nla_get_u32(tb[LWT_XFRM_IF_ID]); 103 104 if (tb[LWT_XFRM_LINK]) 105 info->link = nla_get_u32(tb[LWT_XFRM_LINK]); 106 107 *ts = new_state; 108 return 0; 109 } 110 111 static int xfrmi_fill_encap_info(struct sk_buff *skb, 112 struct lwtunnel_state *lwt) 113 { 114 struct xfrm_md_info *info = lwt_xfrm_info(lwt); 115 116 if (nla_put_u32(skb, LWT_XFRM_IF_ID, info->if_id) || 117 (info->link && nla_put_u32(skb, LWT_XFRM_LINK, info->link))) 118 return -EMSGSIZE; 119 120 return 0; 121 } 122 123 static int xfrmi_encap_nlsize(struct lwtunnel_state *lwtstate) 124 { 125 return nla_total_size(sizeof(u32)) + /* LWT_XFRM_IF_ID */ 126 nla_total_size(sizeof(u32)); /* LWT_XFRM_LINK */ 127 } 128 129 static int xfrmi_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b) 130 { 131 struct xfrm_md_info *a_info = lwt_xfrm_info(a); 132 struct xfrm_md_info *b_info = lwt_xfrm_info(b); 133 134 return memcmp(a_info, b_info, sizeof(*a_info)); 135 } 136 137 static const struct lwtunnel_encap_ops xfrmi_encap_ops = { 138 .build_state = xfrmi_build_state, 139 .destroy_state = xfrmi_destroy_state, 140 .fill_encap = xfrmi_fill_encap_info, 141 .get_encap_size = xfrmi_encap_nlsize, 142 .cmp_encap = xfrmi_encap_cmp, 143 .owner = THIS_MODULE, 144 }; 145 146 #define for_each_xfrmi_rcu(start, xi) \ 147 for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next)) 148 149 static u32 xfrmi_hash(u32 if_id) 150 { 151 return hash_32(if_id, XFRMI_HASH_BITS); 152 } 153 154 static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x) 155 { 156 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 157 struct xfrm_if *xi; 158 159 for_each_xfrmi_rcu(xfrmn->xfrmi[xfrmi_hash(x->if_id)], xi) { 160 if (x->if_id == xi->p.if_id && 161 (xi->dev->flags & IFF_UP)) 162 return xi; 163 } 164 165 xi = rcu_dereference(xfrmn->collect_md_xfrmi); 166 if (xi && (xi->dev->flags & IFF_UP)) 167 return xi; 168 169 return NULL; 170 } 171 172 static bool xfrmi_decode_session(struct sk_buff *skb, 173 unsigned short family, 174 struct xfrm_if_decode_session_result *res) 175 { 176 struct net_device *dev; 177 struct xfrm_if *xi; 178 int ifindex = 0; 179 180 if (!secpath_exists(skb) || !skb->dev) 181 return false; 182 183 switch (family) { 184 case AF_INET6: 185 ifindex = inet6_sdif(skb); 186 break; 187 case AF_INET: 188 ifindex = inet_sdif(skb); 189 break; 190 } 191 192 if (ifindex) { 193 struct net *net = xs_net(xfrm_input_state(skb)); 194 195 dev = dev_get_by_index_rcu(net, ifindex); 196 } else { 197 dev = skb->dev; 198 } 199 200 if (!dev || !(dev->flags & IFF_UP)) 201 return false; 202 if (dev->netdev_ops != &xfrmi_netdev_ops) 203 return false; 204 205 xi = netdev_priv(dev); 206 res->net = xi->net; 207 208 if (xi->p.collect_md) 209 res->if_id = xfrm_input_state(skb)->if_id; 210 else 211 res->if_id = xi->p.if_id; 212 return true; 213 } 214 215 static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi) 216 { 217 struct xfrm_if __rcu **xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)]; 218 219 rcu_assign_pointer(xi->next , rtnl_dereference(*xip)); 220 rcu_assign_pointer(*xip, xi); 221 } 222 223 static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi) 224 { 225 struct xfrm_if __rcu **xip; 226 struct xfrm_if *iter; 227 228 for (xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)]; 229 (iter = rtnl_dereference(*xip)) != NULL; 230 xip = &iter->next) { 231 if (xi == iter) { 232 rcu_assign_pointer(*xip, xi->next); 233 break; 234 } 235 } 236 } 237 238 static void xfrmi_dev_free(struct net_device *dev) 239 { 240 struct xfrm_if *xi = netdev_priv(dev); 241 242 gro_cells_destroy(&xi->gro_cells); 243 free_percpu(dev->tstats); 244 } 245 246 static int xfrmi_create(struct net_device *dev) 247 { 248 struct xfrm_if *xi = netdev_priv(dev); 249 struct net *net = dev_net(dev); 250 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 251 int err; 252 253 dev->rtnl_link_ops = &xfrmi_link_ops; 254 err = register_netdevice(dev); 255 if (err < 0) 256 goto out; 257 258 if (xi->p.collect_md) 259 rcu_assign_pointer(xfrmn->collect_md_xfrmi, xi); 260 else 261 xfrmi_link(xfrmn, xi); 262 263 return 0; 264 265 out: 266 return err; 267 } 268 269 static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p) 270 { 271 struct xfrm_if __rcu **xip; 272 struct xfrm_if *xi; 273 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 274 275 for (xip = &xfrmn->xfrmi[xfrmi_hash(p->if_id)]; 276 (xi = rtnl_dereference(*xip)) != NULL; 277 xip = &xi->next) 278 if (xi->p.if_id == p->if_id) 279 return xi; 280 281 return NULL; 282 } 283 284 static void xfrmi_dev_uninit(struct net_device *dev) 285 { 286 struct xfrm_if *xi = netdev_priv(dev); 287 struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id); 288 289 if (xi->p.collect_md) 290 RCU_INIT_POINTER(xfrmn->collect_md_xfrmi, NULL); 291 else 292 xfrmi_unlink(xfrmn, xi); 293 } 294 295 static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet) 296 { 297 skb_clear_tstamp(skb); 298 skb->pkt_type = PACKET_HOST; 299 skb->skb_iif = 0; 300 skb->ignore_df = 0; 301 skb_dst_drop(skb); 302 nf_reset_ct(skb); 303 nf_reset_trace(skb); 304 305 if (!xnet) 306 return; 307 308 ipvs_reset(skb); 309 secpath_reset(skb); 310 skb_orphan(skb); 311 skb->mark = 0; 312 } 313 314 static int xfrmi_rcv_cb(struct sk_buff *skb, int err) 315 { 316 const struct xfrm_mode *inner_mode; 317 struct net_device *dev; 318 struct xfrm_state *x; 319 struct xfrm_if *xi; 320 bool xnet; 321 int link; 322 323 if (err && !secpath_exists(skb)) 324 return 0; 325 326 x = xfrm_input_state(skb); 327 328 xi = xfrmi_lookup(xs_net(x), x); 329 if (!xi) 330 return 1; 331 332 link = skb->dev->ifindex; 333 dev = xi->dev; 334 skb->dev = dev; 335 336 if (err) { 337 dev->stats.rx_errors++; 338 dev->stats.rx_dropped++; 339 340 return 0; 341 } 342 343 xnet = !net_eq(xi->net, dev_net(skb->dev)); 344 345 if (xnet) { 346 inner_mode = &x->inner_mode; 347 348 if (x->sel.family == AF_UNSPEC) { 349 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 350 if (inner_mode == NULL) { 351 XFRM_INC_STATS(dev_net(skb->dev), 352 LINUX_MIB_XFRMINSTATEMODEERROR); 353 return -EINVAL; 354 } 355 } 356 357 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, 358 inner_mode->family)) 359 return -EPERM; 360 } 361 362 xfrmi_scrub_packet(skb, xnet); 363 if (xi->p.collect_md) { 364 struct metadata_dst *md_dst; 365 366 md_dst = metadata_dst_alloc(0, METADATA_XFRM, GFP_ATOMIC); 367 if (!md_dst) 368 return -ENOMEM; 369 370 md_dst->u.xfrm_info.if_id = x->if_id; 371 md_dst->u.xfrm_info.link = link; 372 skb_dst_set(skb, (struct dst_entry *)md_dst); 373 } 374 dev_sw_netstats_rx_add(dev, skb->len); 375 376 return 0; 377 } 378 379 static int 380 xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) 381 { 382 struct xfrm_if *xi = netdev_priv(dev); 383 struct net_device_stats *stats = &xi->dev->stats; 384 struct dst_entry *dst = skb_dst(skb); 385 unsigned int length = skb->len; 386 struct net_device *tdev; 387 struct xfrm_state *x; 388 int err = -1; 389 u32 if_id; 390 int mtu; 391 392 if (xi->p.collect_md) { 393 struct xfrm_md_info *md_info = skb_xfrm_md_info(skb); 394 395 if (unlikely(!md_info)) 396 return -EINVAL; 397 398 if_id = md_info->if_id; 399 fl->flowi_oif = md_info->link; 400 if (md_info->dst_orig) { 401 struct dst_entry *tmp_dst = dst; 402 403 dst = md_info->dst_orig; 404 skb_dst_set(skb, dst); 405 md_info->dst_orig = NULL; 406 dst_release(tmp_dst); 407 } 408 } else { 409 if_id = xi->p.if_id; 410 } 411 412 dst_hold(dst); 413 dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, if_id); 414 if (IS_ERR(dst)) { 415 err = PTR_ERR(dst); 416 dst = NULL; 417 goto tx_err_link_failure; 418 } 419 420 x = dst->xfrm; 421 if (!x) 422 goto tx_err_link_failure; 423 424 if (x->if_id != if_id) 425 goto tx_err_link_failure; 426 427 tdev = dst->dev; 428 429 if (tdev == dev) { 430 stats->collisions++; 431 net_warn_ratelimited("%s: Local routing loop detected!\n", 432 dev->name); 433 goto tx_err_dst_release; 434 } 435 436 mtu = dst_mtu(dst); 437 if ((!skb_is_gso(skb) && skb->len > mtu) || 438 (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu))) { 439 skb_dst_update_pmtu_no_confirm(skb, mtu); 440 441 if (skb->protocol == htons(ETH_P_IPV6)) { 442 if (mtu < IPV6_MIN_MTU) 443 mtu = IPV6_MIN_MTU; 444 445 if (skb->len > 1280) 446 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 447 else 448 goto xmit; 449 } else { 450 if (!(ip_hdr(skb)->frag_off & htons(IP_DF))) 451 goto xmit; 452 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 453 htonl(mtu)); 454 } 455 456 dst_release(dst); 457 return -EMSGSIZE; 458 } 459 460 xmit: 461 xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev))); 462 skb_dst_set(skb, dst); 463 skb->dev = tdev; 464 465 err = dst_output(xi->net, skb->sk, skb); 466 if (net_xmit_eval(err) == 0) { 467 dev_sw_netstats_tx_add(dev, 1, length); 468 } else { 469 stats->tx_errors++; 470 stats->tx_aborted_errors++; 471 } 472 473 return 0; 474 tx_err_link_failure: 475 stats->tx_carrier_errors++; 476 dst_link_failure(skb); 477 tx_err_dst_release: 478 dst_release(dst); 479 return err; 480 } 481 482 static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev) 483 { 484 struct xfrm_if *xi = netdev_priv(dev); 485 struct net_device_stats *stats = &xi->dev->stats; 486 struct dst_entry *dst = skb_dst(skb); 487 struct flowi fl; 488 int ret; 489 490 memset(&fl, 0, sizeof(fl)); 491 492 switch (skb->protocol) { 493 case htons(ETH_P_IPV6): 494 xfrm_decode_session(skb, &fl, AF_INET6); 495 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); 496 if (!dst) { 497 fl.u.ip6.flowi6_oif = dev->ifindex; 498 fl.u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; 499 dst = ip6_route_output(dev_net(dev), NULL, &fl.u.ip6); 500 if (dst->error) { 501 dst_release(dst); 502 stats->tx_carrier_errors++; 503 goto tx_err; 504 } 505 skb_dst_set(skb, dst); 506 } 507 break; 508 case htons(ETH_P_IP): 509 xfrm_decode_session(skb, &fl, AF_INET); 510 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 511 if (!dst) { 512 struct rtable *rt; 513 514 fl.u.ip4.flowi4_oif = dev->ifindex; 515 fl.u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; 516 rt = __ip_route_output_key(dev_net(dev), &fl.u.ip4); 517 if (IS_ERR(rt)) { 518 stats->tx_carrier_errors++; 519 goto tx_err; 520 } 521 skb_dst_set(skb, &rt->dst); 522 } 523 break; 524 default: 525 goto tx_err; 526 } 527 528 fl.flowi_oif = xi->p.link; 529 530 ret = xfrmi_xmit2(skb, dev, &fl); 531 if (ret < 0) 532 goto tx_err; 533 534 return NETDEV_TX_OK; 535 536 tx_err: 537 stats->tx_errors++; 538 stats->tx_dropped++; 539 kfree_skb(skb); 540 return NETDEV_TX_OK; 541 } 542 543 static int xfrmi4_err(struct sk_buff *skb, u32 info) 544 { 545 const struct iphdr *iph = (const struct iphdr *)skb->data; 546 struct net *net = dev_net(skb->dev); 547 int protocol = iph->protocol; 548 struct ip_comp_hdr *ipch; 549 struct ip_esp_hdr *esph; 550 struct ip_auth_hdr *ah ; 551 struct xfrm_state *x; 552 struct xfrm_if *xi; 553 __be32 spi; 554 555 switch (protocol) { 556 case IPPROTO_ESP: 557 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); 558 spi = esph->spi; 559 break; 560 case IPPROTO_AH: 561 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); 562 spi = ah->spi; 563 break; 564 case IPPROTO_COMP: 565 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); 566 spi = htonl(ntohs(ipch->cpi)); 567 break; 568 default: 569 return 0; 570 } 571 572 switch (icmp_hdr(skb)->type) { 573 case ICMP_DEST_UNREACH: 574 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) 575 return 0; 576 break; 577 case ICMP_REDIRECT: 578 break; 579 default: 580 return 0; 581 } 582 583 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, 584 spi, protocol, AF_INET); 585 if (!x) 586 return 0; 587 588 xi = xfrmi_lookup(net, x); 589 if (!xi) { 590 xfrm_state_put(x); 591 return -1; 592 } 593 594 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) 595 ipv4_update_pmtu(skb, net, info, 0, protocol); 596 else 597 ipv4_redirect(skb, net, 0, protocol); 598 xfrm_state_put(x); 599 600 return 0; 601 } 602 603 static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 604 u8 type, u8 code, int offset, __be32 info) 605 { 606 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; 607 struct net *net = dev_net(skb->dev); 608 int protocol = iph->nexthdr; 609 struct ip_comp_hdr *ipch; 610 struct ip_esp_hdr *esph; 611 struct ip_auth_hdr *ah; 612 struct xfrm_state *x; 613 struct xfrm_if *xi; 614 __be32 spi; 615 616 switch (protocol) { 617 case IPPROTO_ESP: 618 esph = (struct ip_esp_hdr *)(skb->data + offset); 619 spi = esph->spi; 620 break; 621 case IPPROTO_AH: 622 ah = (struct ip_auth_hdr *)(skb->data + offset); 623 spi = ah->spi; 624 break; 625 case IPPROTO_COMP: 626 ipch = (struct ip_comp_hdr *)(skb->data + offset); 627 spi = htonl(ntohs(ipch->cpi)); 628 break; 629 default: 630 return 0; 631 } 632 633 if (type != ICMPV6_PKT_TOOBIG && 634 type != NDISC_REDIRECT) 635 return 0; 636 637 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, 638 spi, protocol, AF_INET6); 639 if (!x) 640 return 0; 641 642 xi = xfrmi_lookup(net, x); 643 if (!xi) { 644 xfrm_state_put(x); 645 return -1; 646 } 647 648 if (type == NDISC_REDIRECT) 649 ip6_redirect(skb, net, skb->dev->ifindex, 0, 650 sock_net_uid(net, NULL)); 651 else 652 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 653 xfrm_state_put(x); 654 655 return 0; 656 } 657 658 static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) 659 { 660 if (xi->p.link != p->link) 661 return -EINVAL; 662 663 xi->p.if_id = p->if_id; 664 665 return 0; 666 } 667 668 static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) 669 { 670 struct net *net = xi->net; 671 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 672 int err; 673 674 xfrmi_unlink(xfrmn, xi); 675 synchronize_net(); 676 err = xfrmi_change(xi, p); 677 xfrmi_link(xfrmn, xi); 678 netdev_state_change(xi->dev); 679 return err; 680 } 681 682 static int xfrmi_get_iflink(const struct net_device *dev) 683 { 684 struct xfrm_if *xi = netdev_priv(dev); 685 686 return xi->p.link; 687 } 688 689 static const struct net_device_ops xfrmi_netdev_ops = { 690 .ndo_init = xfrmi_dev_init, 691 .ndo_uninit = xfrmi_dev_uninit, 692 .ndo_start_xmit = xfrmi_xmit, 693 .ndo_get_stats64 = dev_get_tstats64, 694 .ndo_get_iflink = xfrmi_get_iflink, 695 }; 696 697 static void xfrmi_dev_setup(struct net_device *dev) 698 { 699 dev->netdev_ops = &xfrmi_netdev_ops; 700 dev->header_ops = &ip_tunnel_header_ops; 701 dev->type = ARPHRD_NONE; 702 dev->mtu = ETH_DATA_LEN; 703 dev->min_mtu = ETH_MIN_MTU; 704 dev->max_mtu = IP_MAX_MTU; 705 dev->flags = IFF_NOARP; 706 dev->needs_free_netdev = true; 707 dev->priv_destructor = xfrmi_dev_free; 708 netif_keep_dst(dev); 709 710 eth_broadcast_addr(dev->broadcast); 711 } 712 713 #define XFRMI_FEATURES (NETIF_F_SG | \ 714 NETIF_F_FRAGLIST | \ 715 NETIF_F_GSO_SOFTWARE | \ 716 NETIF_F_HW_CSUM) 717 718 static int xfrmi_dev_init(struct net_device *dev) 719 { 720 struct xfrm_if *xi = netdev_priv(dev); 721 struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link); 722 int err; 723 724 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 725 if (!dev->tstats) 726 return -ENOMEM; 727 728 err = gro_cells_init(&xi->gro_cells, dev); 729 if (err) { 730 free_percpu(dev->tstats); 731 return err; 732 } 733 734 dev->features |= NETIF_F_LLTX; 735 dev->features |= XFRMI_FEATURES; 736 dev->hw_features |= XFRMI_FEATURES; 737 738 if (phydev) { 739 dev->needed_headroom = phydev->needed_headroom; 740 dev->needed_tailroom = phydev->needed_tailroom; 741 742 if (is_zero_ether_addr(dev->dev_addr)) 743 eth_hw_addr_inherit(dev, phydev); 744 if (is_zero_ether_addr(dev->broadcast)) 745 memcpy(dev->broadcast, phydev->broadcast, 746 dev->addr_len); 747 } else { 748 eth_hw_addr_random(dev); 749 eth_broadcast_addr(dev->broadcast); 750 } 751 752 return 0; 753 } 754 755 static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[], 756 struct netlink_ext_ack *extack) 757 { 758 return 0; 759 } 760 761 static void xfrmi_netlink_parms(struct nlattr *data[], 762 struct xfrm_if_parms *parms) 763 { 764 memset(parms, 0, sizeof(*parms)); 765 766 if (!data) 767 return; 768 769 if (data[IFLA_XFRM_LINK]) 770 parms->link = nla_get_u32(data[IFLA_XFRM_LINK]); 771 772 if (data[IFLA_XFRM_IF_ID]) 773 parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]); 774 775 if (data[IFLA_XFRM_COLLECT_METADATA]) 776 parms->collect_md = true; 777 } 778 779 static int xfrmi_newlink(struct net *src_net, struct net_device *dev, 780 struct nlattr *tb[], struct nlattr *data[], 781 struct netlink_ext_ack *extack) 782 { 783 struct net *net = dev_net(dev); 784 struct xfrm_if_parms p = {}; 785 struct xfrm_if *xi; 786 int err; 787 788 xfrmi_netlink_parms(data, &p); 789 if (p.collect_md) { 790 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 791 792 if (p.link || p.if_id) { 793 NL_SET_ERR_MSG(extack, "link and if_id must be zero"); 794 return -EINVAL; 795 } 796 797 if (rtnl_dereference(xfrmn->collect_md_xfrmi)) 798 return -EEXIST; 799 800 } else { 801 if (!p.if_id) { 802 NL_SET_ERR_MSG(extack, "if_id must be non zero"); 803 return -EINVAL; 804 } 805 806 xi = xfrmi_locate(net, &p); 807 if (xi) 808 return -EEXIST; 809 } 810 811 xi = netdev_priv(dev); 812 xi->p = p; 813 xi->net = net; 814 xi->dev = dev; 815 816 err = xfrmi_create(dev); 817 return err; 818 } 819 820 static void xfrmi_dellink(struct net_device *dev, struct list_head *head) 821 { 822 unregister_netdevice_queue(dev, head); 823 } 824 825 static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], 826 struct nlattr *data[], 827 struct netlink_ext_ack *extack) 828 { 829 struct xfrm_if *xi = netdev_priv(dev); 830 struct net *net = xi->net; 831 struct xfrm_if_parms p = {}; 832 833 xfrmi_netlink_parms(data, &p); 834 if (!p.if_id) { 835 NL_SET_ERR_MSG(extack, "if_id must be non zero"); 836 return -EINVAL; 837 } 838 839 if (p.collect_md) { 840 NL_SET_ERR_MSG(extack, "collect_md can't be changed"); 841 return -EINVAL; 842 } 843 844 xi = xfrmi_locate(net, &p); 845 if (!xi) { 846 xi = netdev_priv(dev); 847 } else { 848 if (xi->dev != dev) 849 return -EEXIST; 850 if (xi->p.collect_md) { 851 NL_SET_ERR_MSG(extack, 852 "device can't be changed to collect_md"); 853 return -EINVAL; 854 } 855 } 856 857 return xfrmi_update(xi, &p); 858 } 859 860 static size_t xfrmi_get_size(const struct net_device *dev) 861 { 862 return 863 /* IFLA_XFRM_LINK */ 864 nla_total_size(4) + 865 /* IFLA_XFRM_IF_ID */ 866 nla_total_size(4) + 867 /* IFLA_XFRM_COLLECT_METADATA */ 868 nla_total_size(0) + 869 0; 870 } 871 872 static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev) 873 { 874 struct xfrm_if *xi = netdev_priv(dev); 875 struct xfrm_if_parms *parm = &xi->p; 876 877 if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) || 878 nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id) || 879 (xi->p.collect_md && nla_put_flag(skb, IFLA_XFRM_COLLECT_METADATA))) 880 goto nla_put_failure; 881 return 0; 882 883 nla_put_failure: 884 return -EMSGSIZE; 885 } 886 887 static struct net *xfrmi_get_link_net(const struct net_device *dev) 888 { 889 struct xfrm_if *xi = netdev_priv(dev); 890 891 return xi->net; 892 } 893 894 static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { 895 [IFLA_XFRM_UNSPEC] = { .strict_start_type = IFLA_XFRM_COLLECT_METADATA }, 896 [IFLA_XFRM_LINK] = { .type = NLA_U32 }, 897 [IFLA_XFRM_IF_ID] = { .type = NLA_U32 }, 898 [IFLA_XFRM_COLLECT_METADATA] = { .type = NLA_FLAG }, 899 }; 900 901 static struct rtnl_link_ops xfrmi_link_ops __read_mostly = { 902 .kind = "xfrm", 903 .maxtype = IFLA_XFRM_MAX, 904 .policy = xfrmi_policy, 905 .priv_size = sizeof(struct xfrm_if), 906 .setup = xfrmi_dev_setup, 907 .validate = xfrmi_validate, 908 .newlink = xfrmi_newlink, 909 .dellink = xfrmi_dellink, 910 .changelink = xfrmi_changelink, 911 .get_size = xfrmi_get_size, 912 .fill_info = xfrmi_fill_info, 913 .get_link_net = xfrmi_get_link_net, 914 }; 915 916 static void __net_exit xfrmi_exit_batch_net(struct list_head *net_exit_list) 917 { 918 struct net *net; 919 LIST_HEAD(list); 920 921 rtnl_lock(); 922 list_for_each_entry(net, net_exit_list, exit_list) { 923 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); 924 struct xfrm_if __rcu **xip; 925 struct xfrm_if *xi; 926 int i; 927 928 for (i = 0; i < XFRMI_HASH_SIZE; i++) { 929 for (xip = &xfrmn->xfrmi[i]; 930 (xi = rtnl_dereference(*xip)) != NULL; 931 xip = &xi->next) 932 unregister_netdevice_queue(xi->dev, &list); 933 } 934 xi = rtnl_dereference(xfrmn->collect_md_xfrmi); 935 if (xi) 936 unregister_netdevice_queue(xi->dev, &list); 937 } 938 unregister_netdevice_many(&list); 939 rtnl_unlock(); 940 } 941 942 static struct pernet_operations xfrmi_net_ops = { 943 .exit_batch = xfrmi_exit_batch_net, 944 .id = &xfrmi_net_id, 945 .size = sizeof(struct xfrmi_net), 946 }; 947 948 static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = { 949 .handler = xfrm6_rcv, 950 .input_handler = xfrm_input, 951 .cb_handler = xfrmi_rcv_cb, 952 .err_handler = xfrmi6_err, 953 .priority = 10, 954 }; 955 956 static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = { 957 .handler = xfrm6_rcv, 958 .input_handler = xfrm_input, 959 .cb_handler = xfrmi_rcv_cb, 960 .err_handler = xfrmi6_err, 961 .priority = 10, 962 }; 963 964 static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = { 965 .handler = xfrm6_rcv, 966 .input_handler = xfrm_input, 967 .cb_handler = xfrmi_rcv_cb, 968 .err_handler = xfrmi6_err, 969 .priority = 10, 970 }; 971 972 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) 973 static int xfrmi6_rcv_tunnel(struct sk_buff *skb) 974 { 975 const xfrm_address_t *saddr; 976 __be32 spi; 977 978 saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr; 979 spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr); 980 981 return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL); 982 } 983 984 static struct xfrm6_tunnel xfrmi_ipv6_handler __read_mostly = { 985 .handler = xfrmi6_rcv_tunnel, 986 .cb_handler = xfrmi_rcv_cb, 987 .err_handler = xfrmi6_err, 988 .priority = 2, 989 }; 990 991 static struct xfrm6_tunnel xfrmi_ip6ip_handler __read_mostly = { 992 .handler = xfrmi6_rcv_tunnel, 993 .cb_handler = xfrmi_rcv_cb, 994 .err_handler = xfrmi6_err, 995 .priority = 2, 996 }; 997 #endif 998 999 static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = { 1000 .handler = xfrm4_rcv, 1001 .input_handler = xfrm_input, 1002 .cb_handler = xfrmi_rcv_cb, 1003 .err_handler = xfrmi4_err, 1004 .priority = 10, 1005 }; 1006 1007 static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = { 1008 .handler = xfrm4_rcv, 1009 .input_handler = xfrm_input, 1010 .cb_handler = xfrmi_rcv_cb, 1011 .err_handler = xfrmi4_err, 1012 .priority = 10, 1013 }; 1014 1015 static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = { 1016 .handler = xfrm4_rcv, 1017 .input_handler = xfrm_input, 1018 .cb_handler = xfrmi_rcv_cb, 1019 .err_handler = xfrmi4_err, 1020 .priority = 10, 1021 }; 1022 1023 #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) 1024 static int xfrmi4_rcv_tunnel(struct sk_buff *skb) 1025 { 1026 return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr); 1027 } 1028 1029 static struct xfrm_tunnel xfrmi_ipip_handler __read_mostly = { 1030 .handler = xfrmi4_rcv_tunnel, 1031 .cb_handler = xfrmi_rcv_cb, 1032 .err_handler = xfrmi4_err, 1033 .priority = 3, 1034 }; 1035 1036 static struct xfrm_tunnel xfrmi_ipip6_handler __read_mostly = { 1037 .handler = xfrmi4_rcv_tunnel, 1038 .cb_handler = xfrmi_rcv_cb, 1039 .err_handler = xfrmi4_err, 1040 .priority = 2, 1041 }; 1042 #endif 1043 1044 static int __init xfrmi4_init(void) 1045 { 1046 int err; 1047 1048 err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP); 1049 if (err < 0) 1050 goto xfrm_proto_esp_failed; 1051 err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH); 1052 if (err < 0) 1053 goto xfrm_proto_ah_failed; 1054 err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); 1055 if (err < 0) 1056 goto xfrm_proto_comp_failed; 1057 #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) 1058 err = xfrm4_tunnel_register(&xfrmi_ipip_handler, AF_INET); 1059 if (err < 0) 1060 goto xfrm_tunnel_ipip_failed; 1061 err = xfrm4_tunnel_register(&xfrmi_ipip6_handler, AF_INET6); 1062 if (err < 0) 1063 goto xfrm_tunnel_ipip6_failed; 1064 #endif 1065 1066 return 0; 1067 1068 #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) 1069 xfrm_tunnel_ipip6_failed: 1070 xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET); 1071 xfrm_tunnel_ipip_failed: 1072 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); 1073 #endif 1074 xfrm_proto_comp_failed: 1075 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); 1076 xfrm_proto_ah_failed: 1077 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); 1078 xfrm_proto_esp_failed: 1079 return err; 1080 } 1081 1082 static void xfrmi4_fini(void) 1083 { 1084 #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) 1085 xfrm4_tunnel_deregister(&xfrmi_ipip6_handler, AF_INET6); 1086 xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET); 1087 #endif 1088 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); 1089 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); 1090 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); 1091 } 1092 1093 static int __init xfrmi6_init(void) 1094 { 1095 int err; 1096 1097 err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP); 1098 if (err < 0) 1099 goto xfrm_proto_esp_failed; 1100 err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH); 1101 if (err < 0) 1102 goto xfrm_proto_ah_failed; 1103 err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); 1104 if (err < 0) 1105 goto xfrm_proto_comp_failed; 1106 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) 1107 err = xfrm6_tunnel_register(&xfrmi_ipv6_handler, AF_INET6); 1108 if (err < 0) 1109 goto xfrm_tunnel_ipv6_failed; 1110 err = xfrm6_tunnel_register(&xfrmi_ip6ip_handler, AF_INET); 1111 if (err < 0) 1112 goto xfrm_tunnel_ip6ip_failed; 1113 #endif 1114 1115 return 0; 1116 1117 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) 1118 xfrm_tunnel_ip6ip_failed: 1119 xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6); 1120 xfrm_tunnel_ipv6_failed: 1121 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); 1122 #endif 1123 xfrm_proto_comp_failed: 1124 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); 1125 xfrm_proto_ah_failed: 1126 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); 1127 xfrm_proto_esp_failed: 1128 return err; 1129 } 1130 1131 static void xfrmi6_fini(void) 1132 { 1133 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) 1134 xfrm6_tunnel_deregister(&xfrmi_ip6ip_handler, AF_INET); 1135 xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6); 1136 #endif 1137 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); 1138 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); 1139 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); 1140 } 1141 1142 static const struct xfrm_if_cb xfrm_if_cb = { 1143 .decode_session = xfrmi_decode_session, 1144 }; 1145 1146 static int __init xfrmi_init(void) 1147 { 1148 const char *msg; 1149 int err; 1150 1151 pr_info("IPsec XFRM device driver\n"); 1152 1153 msg = "tunnel device"; 1154 err = register_pernet_device(&xfrmi_net_ops); 1155 if (err < 0) 1156 goto pernet_dev_failed; 1157 1158 msg = "xfrm4 protocols"; 1159 err = xfrmi4_init(); 1160 if (err < 0) 1161 goto xfrmi4_failed; 1162 1163 msg = "xfrm6 protocols"; 1164 err = xfrmi6_init(); 1165 if (err < 0) 1166 goto xfrmi6_failed; 1167 1168 1169 msg = "netlink interface"; 1170 err = rtnl_link_register(&xfrmi_link_ops); 1171 if (err < 0) 1172 goto rtnl_link_failed; 1173 1174 err = register_xfrm_interface_bpf(); 1175 if (err < 0) 1176 goto kfunc_failed; 1177 1178 lwtunnel_encap_add_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM); 1179 1180 xfrm_if_register_cb(&xfrm_if_cb); 1181 1182 return err; 1183 1184 kfunc_failed: 1185 rtnl_link_unregister(&xfrmi_link_ops); 1186 rtnl_link_failed: 1187 xfrmi6_fini(); 1188 xfrmi6_failed: 1189 xfrmi4_fini(); 1190 xfrmi4_failed: 1191 unregister_pernet_device(&xfrmi_net_ops); 1192 pernet_dev_failed: 1193 pr_err("xfrmi init: failed to register %s\n", msg); 1194 return err; 1195 } 1196 1197 static void __exit xfrmi_fini(void) 1198 { 1199 xfrm_if_unregister_cb(); 1200 lwtunnel_encap_del_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM); 1201 rtnl_link_unregister(&xfrmi_link_ops); 1202 xfrmi4_fini(); 1203 xfrmi6_fini(); 1204 unregister_pernet_device(&xfrmi_net_ops); 1205 } 1206 1207 module_init(xfrmi_init); 1208 module_exit(xfrmi_fini); 1209 MODULE_LICENSE("GPL"); 1210 MODULE_ALIAS_RTNL_LINK("xfrm"); 1211 MODULE_ALIAS_NETDEV("xfrm0"); 1212 MODULE_AUTHOR("Steffen Klassert"); 1213 MODULE_DESCRIPTION("XFRM virtual interface"); 1214