1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* GTP according to GSM TS 09.60 / 3GPP TS 29.060 3 * 4 * (C) 2012-2014 by sysmocom - s.f.m.c. GmbH 5 * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org> 6 * 7 * Author: Harald Welte <hwelte@sysmocom.de> 8 * Pablo Neira Ayuso <pablo@netfilter.org> 9 * Andreas Schultz <aschultz@travelping.com> 10 */ 11 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #include <linux/module.h> 15 #include <linux/skbuff.h> 16 #include <linux/udp.h> 17 #include <linux/rculist.h> 18 #include <linux/jhash.h> 19 #include <linux/if_tunnel.h> 20 #include <linux/net.h> 21 #include <linux/file.h> 22 #include <linux/gtp.h> 23 24 #include <net/net_namespace.h> 25 #include <net/protocol.h> 26 #include <net/ip.h> 27 #include <net/udp.h> 28 #include <net/udp_tunnel.h> 29 #include <net/icmp.h> 30 #include <net/xfrm.h> 31 #include <net/genetlink.h> 32 #include <net/netns/generic.h> 33 #include <net/gtp.h> 34 35 /* An active session for the subscriber. */ 36 struct pdp_ctx { 37 struct hlist_node hlist_tid; 38 struct hlist_node hlist_addr; 39 40 union { 41 struct { 42 u64 tid; 43 u16 flow; 44 } v0; 45 struct { 46 u32 i_tei; 47 u32 o_tei; 48 } v1; 49 } u; 50 u8 gtp_version; 51 u16 af; 52 53 struct in_addr ms_addr_ip4; 54 struct in_addr peer_addr_ip4; 55 56 struct sock *sk; 57 struct net_device *dev; 58 59 atomic_t tx_seq; 60 struct rcu_head rcu_head; 61 }; 62 63 /* One instance of the GTP device. */ 64 struct gtp_dev { 65 struct list_head list; 66 67 struct sock *sk0; 68 struct sock *sk1u; 69 u8 sk_created; 70 71 struct net_device *dev; 72 struct net *net; 73 74 unsigned int role; 75 unsigned int hash_size; 76 struct hlist_head *tid_hash; 77 struct hlist_head *addr_hash; 78 79 u8 restart_count; 80 }; 81 82 struct echo_info { 83 struct in_addr ms_addr_ip4; 84 struct in_addr peer_addr_ip4; 85 u8 gtp_version; 86 }; 87 88 static unsigned int gtp_net_id __read_mostly; 89 90 struct gtp_net { 91 struct list_head gtp_dev_list; 92 }; 93 94 static u32 gtp_h_initval; 95 96 static struct genl_family gtp_genl_family; 97 98 enum gtp_multicast_groups { 99 GTP_GENL_MCGRP, 100 }; 101 102 static const struct genl_multicast_group gtp_genl_mcgrps[] = { 103 [GTP_GENL_MCGRP] = { .name = GTP_GENL_MCGRP_NAME }, 104 }; 105 106 static void pdp_context_delete(struct pdp_ctx *pctx); 107 108 static inline u32 gtp0_hashfn(u64 tid) 109 { 110 u32 *tid32 = (u32 *) &tid; 111 return jhash_2words(tid32[0], tid32[1], gtp_h_initval); 112 } 113 114 static inline u32 gtp1u_hashfn(u32 tid) 115 { 116 return jhash_1word(tid, gtp_h_initval); 117 } 118 119 static inline u32 ipv4_hashfn(__be32 ip) 120 { 121 return jhash_1word((__force u32)ip, gtp_h_initval); 122 } 123 124 /* Resolve a PDP context structure based on the 64bit TID. */ 125 static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid) 126 { 127 struct hlist_head *head; 128 struct pdp_ctx *pdp; 129 130 head = >p->tid_hash[gtp0_hashfn(tid) % gtp->hash_size]; 131 132 hlist_for_each_entry_rcu(pdp, head, hlist_tid) { 133 if (pdp->gtp_version == GTP_V0 && 134 pdp->u.v0.tid == tid) 135 return pdp; 136 } 137 return NULL; 138 } 139 140 /* Resolve a PDP context structure based on the 32bit TEI. */ 141 static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid) 142 { 143 struct hlist_head *head; 144 struct pdp_ctx *pdp; 145 146 head = >p->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size]; 147 148 hlist_for_each_entry_rcu(pdp, head, hlist_tid) { 149 if (pdp->gtp_version == GTP_V1 && 150 pdp->u.v1.i_tei == tid) 151 return pdp; 152 } 153 return NULL; 154 } 155 156 /* Resolve a PDP context based on IPv4 address of MS. */ 157 static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr) 158 { 159 struct hlist_head *head; 160 struct pdp_ctx *pdp; 161 162 head = >p->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size]; 163 164 hlist_for_each_entry_rcu(pdp, head, hlist_addr) { 165 if (pdp->af == AF_INET && 166 pdp->ms_addr_ip4.s_addr == ms_addr) 167 return pdp; 168 } 169 170 return NULL; 171 } 172 173 static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx, 174 unsigned int hdrlen, unsigned int role) 175 { 176 struct iphdr *iph; 177 178 if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr))) 179 return false; 180 181 iph = (struct iphdr *)(skb->data + hdrlen); 182 183 if (role == GTP_ROLE_SGSN) 184 return iph->daddr == pctx->ms_addr_ip4.s_addr; 185 else 186 return iph->saddr == pctx->ms_addr_ip4.s_addr; 187 } 188 189 /* Check if the inner IP address in this packet is assigned to any 190 * existing mobile subscriber. 191 */ 192 static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx, 193 unsigned int hdrlen, unsigned int role) 194 { 195 switch (ntohs(skb->protocol)) { 196 case ETH_P_IP: 197 return gtp_check_ms_ipv4(skb, pctx, hdrlen, role); 198 } 199 return false; 200 } 201 202 static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, 203 unsigned int hdrlen, unsigned int role) 204 { 205 if (!gtp_check_ms(skb, pctx, hdrlen, role)) { 206 netdev_dbg(pctx->dev, "No PDP ctx for this MS\n"); 207 return 1; 208 } 209 210 /* Get rid of the GTP + UDP headers. */ 211 if (iptunnel_pull_header(skb, hdrlen, skb->protocol, 212 !net_eq(sock_net(pctx->sk), dev_net(pctx->dev)))) { 213 pctx->dev->stats.rx_length_errors++; 214 goto err; 215 } 216 217 netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n"); 218 219 /* Now that the UDP and the GTP header have been removed, set up the 220 * new network header. This is required by the upper layer to 221 * calculate the transport header. 222 */ 223 skb_reset_network_header(skb); 224 skb_reset_mac_header(skb); 225 226 skb->dev = pctx->dev; 227 228 dev_sw_netstats_rx_add(pctx->dev, skb->len); 229 230 __netif_rx(skb); 231 return 0; 232 233 err: 234 pctx->dev->stats.rx_dropped++; 235 return -1; 236 } 237 238 static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4, 239 const struct sock *sk, 240 __be32 daddr, __be32 saddr) 241 { 242 memset(fl4, 0, sizeof(*fl4)); 243 fl4->flowi4_oif = sk->sk_bound_dev_if; 244 fl4->daddr = daddr; 245 fl4->saddr = saddr; 246 fl4->flowi4_tos = RT_CONN_FLAGS(sk); 247 fl4->flowi4_proto = sk->sk_protocol; 248 249 return ip_route_output_key(sock_net(sk), fl4); 250 } 251 252 /* GSM TS 09.60. 7.3 253 * In all Path Management messages: 254 * - TID: is not used and shall be set to 0. 255 * - Flow Label is not used and shall be set to 0 256 * In signalling messages: 257 * - number: this field is not yet used in signalling messages. 258 * It shall be set to 255 by the sender and shall be ignored 259 * by the receiver 260 * Returns true if the echo req was correct, false otherwise. 261 */ 262 static bool gtp0_validate_echo_hdr(struct gtp0_header *gtp0) 263 { 264 return !(gtp0->tid || (gtp0->flags ^ 0x1e) || 265 gtp0->number != 0xff || gtp0->flow); 266 } 267 268 /* msg_type has to be GTP_ECHO_REQ or GTP_ECHO_RSP */ 269 static void gtp0_build_echo_msg(struct gtp0_header *hdr, __u8 msg_type) 270 { 271 int len_pkt, len_hdr; 272 273 hdr->flags = 0x1e; /* v0, GTP-non-prime. */ 274 hdr->type = msg_type; 275 /* GSM TS 09.60. 7.3 In all Path Management Flow Label and TID 276 * are not used and shall be set to 0. 277 */ 278 hdr->flow = 0; 279 hdr->tid = 0; 280 hdr->number = 0xff; 281 hdr->spare[0] = 0xff; 282 hdr->spare[1] = 0xff; 283 hdr->spare[2] = 0xff; 284 285 len_pkt = sizeof(struct gtp0_packet); 286 len_hdr = sizeof(struct gtp0_header); 287 288 if (msg_type == GTP_ECHO_RSP) 289 hdr->length = htons(len_pkt - len_hdr); 290 else 291 hdr->length = 0; 292 } 293 294 static int gtp0_send_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) 295 { 296 struct gtp0_packet *gtp_pkt; 297 struct gtp0_header *gtp0; 298 struct rtable *rt; 299 struct flowi4 fl4; 300 struct iphdr *iph; 301 __be16 seq; 302 303 gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); 304 305 if (!gtp0_validate_echo_hdr(gtp0)) 306 return -1; 307 308 seq = gtp0->seq; 309 310 /* pull GTP and UDP headers */ 311 skb_pull_data(skb, sizeof(struct gtp0_header) + sizeof(struct udphdr)); 312 313 gtp_pkt = skb_push(skb, sizeof(struct gtp0_packet)); 314 memset(gtp_pkt, 0, sizeof(struct gtp0_packet)); 315 316 gtp0_build_echo_msg(>p_pkt->gtp0_h, GTP_ECHO_RSP); 317 318 /* GSM TS 09.60. 7.3 The Sequence Number in a signalling response 319 * message shall be copied from the signalling request message 320 * that the GSN is replying to. 321 */ 322 gtp_pkt->gtp0_h.seq = seq; 323 324 gtp_pkt->ie.tag = GTPIE_RECOVERY; 325 gtp_pkt->ie.val = gtp->restart_count; 326 327 iph = ip_hdr(skb); 328 329 /* find route to the sender, 330 * src address becomes dst address and vice versa. 331 */ 332 rt = ip4_route_output_gtp(&fl4, gtp->sk0, iph->saddr, iph->daddr); 333 if (IS_ERR(rt)) { 334 netdev_dbg(gtp->dev, "no route for echo response from %pI4\n", 335 &iph->saddr); 336 return -1; 337 } 338 339 udp_tunnel_xmit_skb(rt, gtp->sk0, skb, 340 fl4.saddr, fl4.daddr, 341 iph->tos, 342 ip4_dst_hoplimit(&rt->dst), 343 0, 344 htons(GTP0_PORT), htons(GTP0_PORT), 345 !net_eq(sock_net(gtp->sk1u), 346 dev_net(gtp->dev)), 347 false); 348 return 0; 349 } 350 351 static int gtp_genl_fill_echo(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, 352 int flags, u32 type, struct echo_info echo) 353 { 354 void *genlh; 355 356 genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, flags, 357 type); 358 if (!genlh) 359 goto failure; 360 361 if (nla_put_u32(skb, GTPA_VERSION, echo.gtp_version) || 362 nla_put_be32(skb, GTPA_PEER_ADDRESS, echo.peer_addr_ip4.s_addr) || 363 nla_put_be32(skb, GTPA_MS_ADDRESS, echo.ms_addr_ip4.s_addr)) 364 goto failure; 365 366 genlmsg_end(skb, genlh); 367 return 0; 368 369 failure: 370 genlmsg_cancel(skb, genlh); 371 return -EMSGSIZE; 372 } 373 374 static int gtp0_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) 375 { 376 struct gtp0_header *gtp0; 377 struct echo_info echo; 378 struct sk_buff *msg; 379 struct iphdr *iph; 380 int ret; 381 382 gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); 383 384 if (!gtp0_validate_echo_hdr(gtp0)) 385 return -1; 386 387 iph = ip_hdr(skb); 388 echo.ms_addr_ip4.s_addr = iph->daddr; 389 echo.peer_addr_ip4.s_addr = iph->saddr; 390 echo.gtp_version = GTP_V0; 391 392 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 393 if (!msg) 394 return -ENOMEM; 395 396 ret = gtp_genl_fill_echo(msg, 0, 0, 0, GTP_CMD_ECHOREQ, echo); 397 if (ret < 0) { 398 nlmsg_free(msg); 399 return ret; 400 } 401 402 return genlmsg_multicast_netns(>p_genl_family, dev_net(gtp->dev), 403 msg, 0, GTP_GENL_MCGRP, GFP_ATOMIC); 404 } 405 406 /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */ 407 static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) 408 { 409 unsigned int hdrlen = sizeof(struct udphdr) + 410 sizeof(struct gtp0_header); 411 struct gtp0_header *gtp0; 412 struct pdp_ctx *pctx; 413 414 if (!pskb_may_pull(skb, hdrlen)) 415 return -1; 416 417 gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); 418 419 if ((gtp0->flags >> 5) != GTP_V0) 420 return 1; 421 422 /* If the sockets were created in kernel, it means that 423 * there is no daemon running in userspace which would 424 * handle echo request. 425 */ 426 if (gtp0->type == GTP_ECHO_REQ && gtp->sk_created) 427 return gtp0_send_echo_resp(gtp, skb); 428 429 if (gtp0->type == GTP_ECHO_RSP && gtp->sk_created) 430 return gtp0_handle_echo_resp(gtp, skb); 431 432 if (gtp0->type != GTP_TPDU) 433 return 1; 434 435 pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid)); 436 if (!pctx) { 437 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); 438 return 1; 439 } 440 441 return gtp_rx(pctx, skb, hdrlen, gtp->role); 442 } 443 444 /* msg_type has to be GTP_ECHO_REQ or GTP_ECHO_RSP */ 445 static void gtp1u_build_echo_msg(struct gtp1_header_long *hdr, __u8 msg_type) 446 { 447 int len_pkt, len_hdr; 448 449 /* S flag must be set to 1 */ 450 hdr->flags = 0x32; /* v1, GTP-non-prime. */ 451 hdr->type = msg_type; 452 /* 3GPP TS 29.281 5.1 - TEID has to be set to 0 */ 453 hdr->tid = 0; 454 455 /* seq, npdu and next should be counted to the length of the GTP packet 456 * that's why szie of gtp1_header should be subtracted, 457 * not size of gtp1_header_long. 458 */ 459 460 len_hdr = sizeof(struct gtp1_header); 461 462 if (msg_type == GTP_ECHO_RSP) { 463 len_pkt = sizeof(struct gtp1u_packet); 464 hdr->length = htons(len_pkt - len_hdr); 465 } else { 466 /* GTP_ECHO_REQ does not carry GTP Information Element, 467 * the why gtp1_header_long is used here. 468 */ 469 len_pkt = sizeof(struct gtp1_header_long); 470 hdr->length = htons(len_pkt - len_hdr); 471 } 472 } 473 474 static int gtp1u_send_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) 475 { 476 struct gtp1_header_long *gtp1u; 477 struct gtp1u_packet *gtp_pkt; 478 struct rtable *rt; 479 struct flowi4 fl4; 480 struct iphdr *iph; 481 482 gtp1u = (struct gtp1_header_long *)(skb->data + sizeof(struct udphdr)); 483 484 /* 3GPP TS 29.281 5.1 - For the Echo Request, Echo Response, 485 * Error Indication and Supported Extension Headers Notification 486 * messages, the S flag shall be set to 1 and TEID shall be set to 0. 487 */ 488 if (!(gtp1u->flags & GTP1_F_SEQ) || gtp1u->tid) 489 return -1; 490 491 /* pull GTP and UDP headers */ 492 skb_pull_data(skb, 493 sizeof(struct gtp1_header_long) + sizeof(struct udphdr)); 494 495 gtp_pkt = skb_push(skb, sizeof(struct gtp1u_packet)); 496 memset(gtp_pkt, 0, sizeof(struct gtp1u_packet)); 497 498 gtp1u_build_echo_msg(>p_pkt->gtp1u_h, GTP_ECHO_RSP); 499 500 /* 3GPP TS 29.281 7.7.2 - The Restart Counter value in the 501 * Recovery information element shall not be used, i.e. it shall 502 * be set to zero by the sender and shall be ignored by the receiver. 503 * The Recovery information element is mandatory due to backwards 504 * compatibility reasons. 505 */ 506 gtp_pkt->ie.tag = GTPIE_RECOVERY; 507 gtp_pkt->ie.val = 0; 508 509 iph = ip_hdr(skb); 510 511 /* find route to the sender, 512 * src address becomes dst address and vice versa. 513 */ 514 rt = ip4_route_output_gtp(&fl4, gtp->sk1u, iph->saddr, iph->daddr); 515 if (IS_ERR(rt)) { 516 netdev_dbg(gtp->dev, "no route for echo response from %pI4\n", 517 &iph->saddr); 518 return -1; 519 } 520 521 udp_tunnel_xmit_skb(rt, gtp->sk1u, skb, 522 fl4.saddr, fl4.daddr, 523 iph->tos, 524 ip4_dst_hoplimit(&rt->dst), 525 0, 526 htons(GTP1U_PORT), htons(GTP1U_PORT), 527 !net_eq(sock_net(gtp->sk1u), 528 dev_net(gtp->dev)), 529 false); 530 return 0; 531 } 532 533 static int gtp1u_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) 534 { 535 struct gtp1_header_long *gtp1u; 536 struct echo_info echo; 537 struct sk_buff *msg; 538 struct iphdr *iph; 539 int ret; 540 541 gtp1u = (struct gtp1_header_long *)(skb->data + sizeof(struct udphdr)); 542 543 /* 3GPP TS 29.281 5.1 - For the Echo Request, Echo Response, 544 * Error Indication and Supported Extension Headers Notification 545 * messages, the S flag shall be set to 1 and TEID shall be set to 0. 546 */ 547 if (!(gtp1u->flags & GTP1_F_SEQ) || gtp1u->tid) 548 return -1; 549 550 iph = ip_hdr(skb); 551 echo.ms_addr_ip4.s_addr = iph->daddr; 552 echo.peer_addr_ip4.s_addr = iph->saddr; 553 echo.gtp_version = GTP_V1; 554 555 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 556 if (!msg) 557 return -ENOMEM; 558 559 ret = gtp_genl_fill_echo(msg, 0, 0, 0, GTP_CMD_ECHOREQ, echo); 560 if (ret < 0) { 561 nlmsg_free(msg); 562 return ret; 563 } 564 565 return genlmsg_multicast_netns(>p_genl_family, dev_net(gtp->dev), 566 msg, 0, GTP_GENL_MCGRP, GFP_ATOMIC); 567 } 568 569 static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) 570 { 571 unsigned int hdrlen = sizeof(struct udphdr) + 572 sizeof(struct gtp1_header); 573 struct gtp1_header *gtp1; 574 struct pdp_ctx *pctx; 575 576 if (!pskb_may_pull(skb, hdrlen)) 577 return -1; 578 579 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); 580 581 if ((gtp1->flags >> 5) != GTP_V1) 582 return 1; 583 584 /* If the sockets were created in kernel, it means that 585 * there is no daemon running in userspace which would 586 * handle echo request. 587 */ 588 if (gtp1->type == GTP_ECHO_REQ && gtp->sk_created) 589 return gtp1u_send_echo_resp(gtp, skb); 590 591 if (gtp1->type == GTP_ECHO_RSP && gtp->sk_created) 592 return gtp1u_handle_echo_resp(gtp, skb); 593 594 if (gtp1->type != GTP_TPDU) 595 return 1; 596 597 /* From 29.060: "This field shall be present if and only if any one or 598 * more of the S, PN and E flags are set.". 599 * 600 * If any of the bit is set, then the remaining ones also have to be 601 * set. 602 */ 603 if (gtp1->flags & GTP1_F_MASK) 604 hdrlen += 4; 605 606 /* Make sure the header is larger enough, including extensions. */ 607 if (!pskb_may_pull(skb, hdrlen)) 608 return -1; 609 610 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); 611 612 pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid)); 613 if (!pctx) { 614 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); 615 return 1; 616 } 617 618 return gtp_rx(pctx, skb, hdrlen, gtp->role); 619 } 620 621 static void __gtp_encap_destroy(struct sock *sk) 622 { 623 struct gtp_dev *gtp; 624 625 lock_sock(sk); 626 gtp = sk->sk_user_data; 627 if (gtp) { 628 if (gtp->sk0 == sk) 629 gtp->sk0 = NULL; 630 else 631 gtp->sk1u = NULL; 632 udp_sk(sk)->encap_type = 0; 633 rcu_assign_sk_user_data(sk, NULL); 634 release_sock(sk); 635 sock_put(sk); 636 return; 637 } 638 release_sock(sk); 639 } 640 641 static void gtp_encap_destroy(struct sock *sk) 642 { 643 rtnl_lock(); 644 __gtp_encap_destroy(sk); 645 rtnl_unlock(); 646 } 647 648 static void gtp_encap_disable_sock(struct sock *sk) 649 { 650 if (!sk) 651 return; 652 653 __gtp_encap_destroy(sk); 654 } 655 656 static void gtp_encap_disable(struct gtp_dev *gtp) 657 { 658 if (gtp->sk_created) { 659 udp_tunnel_sock_release(gtp->sk0->sk_socket); 660 udp_tunnel_sock_release(gtp->sk1u->sk_socket); 661 gtp->sk_created = false; 662 gtp->sk0 = NULL; 663 gtp->sk1u = NULL; 664 } else { 665 gtp_encap_disable_sock(gtp->sk0); 666 gtp_encap_disable_sock(gtp->sk1u); 667 } 668 } 669 670 /* UDP encapsulation receive handler. See net/ipv4/udp.c. 671 * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket. 672 */ 673 static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) 674 { 675 struct gtp_dev *gtp; 676 int ret = 0; 677 678 gtp = rcu_dereference_sk_user_data(sk); 679 if (!gtp) 680 return 1; 681 682 netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); 683 684 switch (udp_sk(sk)->encap_type) { 685 case UDP_ENCAP_GTP0: 686 netdev_dbg(gtp->dev, "received GTP0 packet\n"); 687 ret = gtp0_udp_encap_recv(gtp, skb); 688 break; 689 case UDP_ENCAP_GTP1U: 690 netdev_dbg(gtp->dev, "received GTP1U packet\n"); 691 ret = gtp1u_udp_encap_recv(gtp, skb); 692 break; 693 default: 694 ret = -1; /* Shouldn't happen. */ 695 } 696 697 switch (ret) { 698 case 1: 699 netdev_dbg(gtp->dev, "pass up to the process\n"); 700 break; 701 case 0: 702 break; 703 case -1: 704 netdev_dbg(gtp->dev, "GTP packet has been dropped\n"); 705 kfree_skb(skb); 706 ret = 0; 707 break; 708 } 709 710 return ret; 711 } 712 713 static int gtp_dev_init(struct net_device *dev) 714 { 715 struct gtp_dev *gtp = netdev_priv(dev); 716 717 gtp->dev = dev; 718 719 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 720 if (!dev->tstats) 721 return -ENOMEM; 722 723 return 0; 724 } 725 726 static void gtp_dev_uninit(struct net_device *dev) 727 { 728 struct gtp_dev *gtp = netdev_priv(dev); 729 730 gtp_encap_disable(gtp); 731 free_percpu(dev->tstats); 732 } 733 734 static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) 735 { 736 int payload_len = skb->len; 737 struct gtp0_header *gtp0; 738 739 gtp0 = skb_push(skb, sizeof(*gtp0)); 740 741 gtp0->flags = 0x1e; /* v0, GTP-non-prime. */ 742 gtp0->type = GTP_TPDU; 743 gtp0->length = htons(payload_len); 744 gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff); 745 gtp0->flow = htons(pctx->u.v0.flow); 746 gtp0->number = 0xff; 747 gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff; 748 gtp0->tid = cpu_to_be64(pctx->u.v0.tid); 749 } 750 751 static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) 752 { 753 int payload_len = skb->len; 754 struct gtp1_header *gtp1; 755 756 gtp1 = skb_push(skb, sizeof(*gtp1)); 757 758 /* Bits 8 7 6 5 4 3 2 1 759 * +--+--+--+--+--+--+--+--+ 760 * |version |PT| 0| E| S|PN| 761 * +--+--+--+--+--+--+--+--+ 762 * 0 0 1 1 1 0 0 0 763 */ 764 gtp1->flags = 0x30; /* v1, GTP-non-prime. */ 765 gtp1->type = GTP_TPDU; 766 gtp1->length = htons(payload_len); 767 gtp1->tid = htonl(pctx->u.v1.o_tei); 768 769 /* TODO: Support for extension header, sequence number and N-PDU. 770 * Update the length field if any of them is available. 771 */ 772 } 773 774 struct gtp_pktinfo { 775 struct sock *sk; 776 struct iphdr *iph; 777 struct flowi4 fl4; 778 struct rtable *rt; 779 struct pdp_ctx *pctx; 780 struct net_device *dev; 781 __be16 gtph_port; 782 }; 783 784 static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo) 785 { 786 switch (pktinfo->pctx->gtp_version) { 787 case GTP_V0: 788 pktinfo->gtph_port = htons(GTP0_PORT); 789 gtp0_push_header(skb, pktinfo->pctx); 790 break; 791 case GTP_V1: 792 pktinfo->gtph_port = htons(GTP1U_PORT); 793 gtp1_push_header(skb, pktinfo->pctx); 794 break; 795 } 796 } 797 798 static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, 799 struct sock *sk, struct iphdr *iph, 800 struct pdp_ctx *pctx, struct rtable *rt, 801 struct flowi4 *fl4, 802 struct net_device *dev) 803 { 804 pktinfo->sk = sk; 805 pktinfo->iph = iph; 806 pktinfo->pctx = pctx; 807 pktinfo->rt = rt; 808 pktinfo->fl4 = *fl4; 809 pktinfo->dev = dev; 810 } 811 812 static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, 813 struct gtp_pktinfo *pktinfo) 814 { 815 struct gtp_dev *gtp = netdev_priv(dev); 816 struct pdp_ctx *pctx; 817 struct rtable *rt; 818 struct flowi4 fl4; 819 struct iphdr *iph; 820 __be16 df; 821 int mtu; 822 823 /* Read the IP destination address and resolve the PDP context. 824 * Prepend PDP header with TEI/TID from PDP ctx. 825 */ 826 iph = ip_hdr(skb); 827 if (gtp->role == GTP_ROLE_SGSN) 828 pctx = ipv4_pdp_find(gtp, iph->saddr); 829 else 830 pctx = ipv4_pdp_find(gtp, iph->daddr); 831 832 if (!pctx) { 833 netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", 834 &iph->daddr); 835 return -ENOENT; 836 } 837 netdev_dbg(dev, "found PDP context %p\n", pctx); 838 839 rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr, 840 inet_sk(pctx->sk)->inet_saddr); 841 if (IS_ERR(rt)) { 842 netdev_dbg(dev, "no route to SSGN %pI4\n", 843 &pctx->peer_addr_ip4.s_addr); 844 dev->stats.tx_carrier_errors++; 845 goto err; 846 } 847 848 if (rt->dst.dev == dev) { 849 netdev_dbg(dev, "circular route to SSGN %pI4\n", 850 &pctx->peer_addr_ip4.s_addr); 851 dev->stats.collisions++; 852 goto err_rt; 853 } 854 855 /* This is similar to tnl_update_pmtu(). */ 856 df = iph->frag_off; 857 if (df) { 858 mtu = dst_mtu(&rt->dst) - dev->hard_header_len - 859 sizeof(struct iphdr) - sizeof(struct udphdr); 860 switch (pctx->gtp_version) { 861 case GTP_V0: 862 mtu -= sizeof(struct gtp0_header); 863 break; 864 case GTP_V1: 865 mtu -= sizeof(struct gtp1_header); 866 break; 867 } 868 } else { 869 mtu = dst_mtu(&rt->dst); 870 } 871 872 skb_dst_update_pmtu_no_confirm(skb, mtu); 873 874 if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) && 875 mtu < ntohs(iph->tot_len)) { 876 netdev_dbg(dev, "packet too big, fragmentation needed\n"); 877 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 878 htonl(mtu)); 879 goto err_rt; 880 } 881 882 gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev); 883 gtp_push_header(skb, pktinfo); 884 885 return 0; 886 err_rt: 887 ip_rt_put(rt); 888 err: 889 return -EBADMSG; 890 } 891 892 static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) 893 { 894 unsigned int proto = ntohs(skb->protocol); 895 struct gtp_pktinfo pktinfo; 896 int err; 897 898 /* Ensure there is sufficient headroom. */ 899 if (skb_cow_head(skb, dev->needed_headroom)) 900 goto tx_err; 901 902 skb_reset_inner_headers(skb); 903 904 /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */ 905 rcu_read_lock(); 906 switch (proto) { 907 case ETH_P_IP: 908 err = gtp_build_skb_ip4(skb, dev, &pktinfo); 909 break; 910 default: 911 err = -EOPNOTSUPP; 912 break; 913 } 914 rcu_read_unlock(); 915 916 if (err < 0) 917 goto tx_err; 918 919 switch (proto) { 920 case ETH_P_IP: 921 netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n", 922 &pktinfo.iph->saddr, &pktinfo.iph->daddr); 923 udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, 924 pktinfo.fl4.saddr, pktinfo.fl4.daddr, 925 pktinfo.iph->tos, 926 ip4_dst_hoplimit(&pktinfo.rt->dst), 927 0, 928 pktinfo.gtph_port, pktinfo.gtph_port, 929 !net_eq(sock_net(pktinfo.pctx->sk), 930 dev_net(dev)), 931 false); 932 break; 933 } 934 935 return NETDEV_TX_OK; 936 tx_err: 937 dev->stats.tx_errors++; 938 dev_kfree_skb(skb); 939 return NETDEV_TX_OK; 940 } 941 942 static const struct net_device_ops gtp_netdev_ops = { 943 .ndo_init = gtp_dev_init, 944 .ndo_uninit = gtp_dev_uninit, 945 .ndo_start_xmit = gtp_dev_xmit, 946 .ndo_get_stats64 = dev_get_tstats64, 947 }; 948 949 static const struct device_type gtp_type = { 950 .name = "gtp", 951 }; 952 953 static void gtp_link_setup(struct net_device *dev) 954 { 955 unsigned int max_gtp_header_len = sizeof(struct iphdr) + 956 sizeof(struct udphdr) + 957 sizeof(struct gtp0_header); 958 959 dev->netdev_ops = >p_netdev_ops; 960 dev->needs_free_netdev = true; 961 SET_NETDEV_DEVTYPE(dev, >p_type); 962 963 dev->hard_header_len = 0; 964 dev->addr_len = 0; 965 dev->mtu = ETH_DATA_LEN - max_gtp_header_len; 966 967 /* Zero header length. */ 968 dev->type = ARPHRD_NONE; 969 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 970 971 dev->priv_flags |= IFF_NO_QUEUE; 972 dev->features |= NETIF_F_LLTX; 973 netif_keep_dst(dev); 974 975 dev->needed_headroom = LL_MAX_HEADER + max_gtp_header_len; 976 } 977 978 static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); 979 static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]); 980 981 static void gtp_destructor(struct net_device *dev) 982 { 983 struct gtp_dev *gtp = netdev_priv(dev); 984 985 kfree(gtp->addr_hash); 986 kfree(gtp->tid_hash); 987 } 988 989 static struct sock *gtp_create_sock(int type, struct gtp_dev *gtp) 990 { 991 struct udp_tunnel_sock_cfg tuncfg = {}; 992 struct udp_port_cfg udp_conf = { 993 .local_ip.s_addr = htonl(INADDR_ANY), 994 .family = AF_INET, 995 }; 996 struct net *net = gtp->net; 997 struct socket *sock; 998 int err; 999 1000 if (type == UDP_ENCAP_GTP0) 1001 udp_conf.local_udp_port = htons(GTP0_PORT); 1002 else if (type == UDP_ENCAP_GTP1U) 1003 udp_conf.local_udp_port = htons(GTP1U_PORT); 1004 else 1005 return ERR_PTR(-EINVAL); 1006 1007 err = udp_sock_create(net, &udp_conf, &sock); 1008 if (err) 1009 return ERR_PTR(err); 1010 1011 tuncfg.sk_user_data = gtp; 1012 tuncfg.encap_type = type; 1013 tuncfg.encap_rcv = gtp_encap_recv; 1014 tuncfg.encap_destroy = NULL; 1015 1016 setup_udp_tunnel_sock(net, sock, &tuncfg); 1017 1018 return sock->sk; 1019 } 1020 1021 static int gtp_create_sockets(struct gtp_dev *gtp, struct nlattr *data[]) 1022 { 1023 struct sock *sk1u = NULL; 1024 struct sock *sk0 = NULL; 1025 1026 sk0 = gtp_create_sock(UDP_ENCAP_GTP0, gtp); 1027 if (IS_ERR(sk0)) 1028 return PTR_ERR(sk0); 1029 1030 sk1u = gtp_create_sock(UDP_ENCAP_GTP1U, gtp); 1031 if (IS_ERR(sk1u)) { 1032 udp_tunnel_sock_release(sk0->sk_socket); 1033 return PTR_ERR(sk1u); 1034 } 1035 1036 gtp->sk_created = true; 1037 gtp->sk0 = sk0; 1038 gtp->sk1u = sk1u; 1039 1040 return 0; 1041 } 1042 1043 static int gtp_newlink(struct net *src_net, struct net_device *dev, 1044 struct nlattr *tb[], struct nlattr *data[], 1045 struct netlink_ext_ack *extack) 1046 { 1047 unsigned int role = GTP_ROLE_GGSN; 1048 struct gtp_dev *gtp; 1049 struct gtp_net *gn; 1050 int hashsize, err; 1051 1052 gtp = netdev_priv(dev); 1053 1054 if (!data[IFLA_GTP_PDP_HASHSIZE]) { 1055 hashsize = 1024; 1056 } else { 1057 hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]); 1058 if (!hashsize) 1059 hashsize = 1024; 1060 } 1061 1062 if (data[IFLA_GTP_ROLE]) { 1063 role = nla_get_u32(data[IFLA_GTP_ROLE]); 1064 if (role > GTP_ROLE_SGSN) 1065 return -EINVAL; 1066 } 1067 gtp->role = role; 1068 1069 if (!data[IFLA_GTP_RESTART_COUNT]) 1070 gtp->restart_count = 0; 1071 else 1072 gtp->restart_count = nla_get_u8(data[IFLA_GTP_RESTART_COUNT]); 1073 1074 gtp->net = src_net; 1075 1076 err = gtp_hashtable_new(gtp, hashsize); 1077 if (err < 0) 1078 return err; 1079 1080 if (data[IFLA_GTP_CREATE_SOCKETS]) 1081 err = gtp_create_sockets(gtp, data); 1082 else 1083 err = gtp_encap_enable(gtp, data); 1084 if (err < 0) 1085 goto out_hashtable; 1086 1087 err = register_netdevice(dev); 1088 if (err < 0) { 1089 netdev_dbg(dev, "failed to register new netdev %d\n", err); 1090 goto out_encap; 1091 } 1092 1093 gn = net_generic(dev_net(dev), gtp_net_id); 1094 list_add_rcu(>p->list, &gn->gtp_dev_list); 1095 dev->priv_destructor = gtp_destructor; 1096 1097 netdev_dbg(dev, "registered new GTP interface\n"); 1098 1099 return 0; 1100 1101 out_encap: 1102 gtp_encap_disable(gtp); 1103 out_hashtable: 1104 kfree(gtp->addr_hash); 1105 kfree(gtp->tid_hash); 1106 return err; 1107 } 1108 1109 static void gtp_dellink(struct net_device *dev, struct list_head *head) 1110 { 1111 struct gtp_dev *gtp = netdev_priv(dev); 1112 struct pdp_ctx *pctx; 1113 int i; 1114 1115 for (i = 0; i < gtp->hash_size; i++) 1116 hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) 1117 pdp_context_delete(pctx); 1118 1119 list_del_rcu(>p->list); 1120 unregister_netdevice_queue(dev, head); 1121 } 1122 1123 static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = { 1124 [IFLA_GTP_FD0] = { .type = NLA_U32 }, 1125 [IFLA_GTP_FD1] = { .type = NLA_U32 }, 1126 [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 }, 1127 [IFLA_GTP_ROLE] = { .type = NLA_U32 }, 1128 [IFLA_GTP_CREATE_SOCKETS] = { .type = NLA_U8 }, 1129 [IFLA_GTP_RESTART_COUNT] = { .type = NLA_U8 }, 1130 }; 1131 1132 static int gtp_validate(struct nlattr *tb[], struct nlattr *data[], 1133 struct netlink_ext_ack *extack) 1134 { 1135 if (!data) 1136 return -EINVAL; 1137 1138 return 0; 1139 } 1140 1141 static size_t gtp_get_size(const struct net_device *dev) 1142 { 1143 return nla_total_size(sizeof(__u32)) + /* IFLA_GTP_PDP_HASHSIZE */ 1144 nla_total_size(sizeof(__u32)) + /* IFLA_GTP_ROLE */ 1145 nla_total_size(sizeof(__u8)); /* IFLA_GTP_RESTART_COUNT */ 1146 } 1147 1148 static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) 1149 { 1150 struct gtp_dev *gtp = netdev_priv(dev); 1151 1152 if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size)) 1153 goto nla_put_failure; 1154 if (nla_put_u32(skb, IFLA_GTP_ROLE, gtp->role)) 1155 goto nla_put_failure; 1156 if (nla_put_u8(skb, IFLA_GTP_RESTART_COUNT, gtp->restart_count)) 1157 goto nla_put_failure; 1158 1159 return 0; 1160 1161 nla_put_failure: 1162 return -EMSGSIZE; 1163 } 1164 1165 static struct rtnl_link_ops gtp_link_ops __read_mostly = { 1166 .kind = "gtp", 1167 .maxtype = IFLA_GTP_MAX, 1168 .policy = gtp_policy, 1169 .priv_size = sizeof(struct gtp_dev), 1170 .setup = gtp_link_setup, 1171 .validate = gtp_validate, 1172 .newlink = gtp_newlink, 1173 .dellink = gtp_dellink, 1174 .get_size = gtp_get_size, 1175 .fill_info = gtp_fill_info, 1176 }; 1177 1178 static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) 1179 { 1180 int i; 1181 1182 gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head), 1183 GFP_KERNEL | __GFP_NOWARN); 1184 if (gtp->addr_hash == NULL) 1185 return -ENOMEM; 1186 1187 gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head), 1188 GFP_KERNEL | __GFP_NOWARN); 1189 if (gtp->tid_hash == NULL) 1190 goto err1; 1191 1192 gtp->hash_size = hsize; 1193 1194 for (i = 0; i < hsize; i++) { 1195 INIT_HLIST_HEAD(>p->addr_hash[i]); 1196 INIT_HLIST_HEAD(>p->tid_hash[i]); 1197 } 1198 return 0; 1199 err1: 1200 kfree(gtp->addr_hash); 1201 return -ENOMEM; 1202 } 1203 1204 static struct sock *gtp_encap_enable_socket(int fd, int type, 1205 struct gtp_dev *gtp) 1206 { 1207 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 1208 struct socket *sock; 1209 struct sock *sk; 1210 int err; 1211 1212 pr_debug("enable gtp on %d, %d\n", fd, type); 1213 1214 sock = sockfd_lookup(fd, &err); 1215 if (!sock) { 1216 pr_debug("gtp socket fd=%d not found\n", fd); 1217 return NULL; 1218 } 1219 1220 sk = sock->sk; 1221 if (sk->sk_protocol != IPPROTO_UDP || 1222 sk->sk_type != SOCK_DGRAM || 1223 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) { 1224 pr_debug("socket fd=%d not UDP\n", fd); 1225 sk = ERR_PTR(-EINVAL); 1226 goto out_sock; 1227 } 1228 1229 lock_sock(sk); 1230 if (sk->sk_user_data) { 1231 sk = ERR_PTR(-EBUSY); 1232 goto out_rel_sock; 1233 } 1234 1235 sock_hold(sk); 1236 1237 tuncfg.sk_user_data = gtp; 1238 tuncfg.encap_type = type; 1239 tuncfg.encap_rcv = gtp_encap_recv; 1240 tuncfg.encap_destroy = gtp_encap_destroy; 1241 1242 setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg); 1243 1244 out_rel_sock: 1245 release_sock(sock->sk); 1246 out_sock: 1247 sockfd_put(sock); 1248 return sk; 1249 } 1250 1251 static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]) 1252 { 1253 struct sock *sk1u = NULL; 1254 struct sock *sk0 = NULL; 1255 1256 if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1]) 1257 return -EINVAL; 1258 1259 if (data[IFLA_GTP_FD0]) { 1260 u32 fd0 = nla_get_u32(data[IFLA_GTP_FD0]); 1261 1262 sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp); 1263 if (IS_ERR(sk0)) 1264 return PTR_ERR(sk0); 1265 } 1266 1267 if (data[IFLA_GTP_FD1]) { 1268 u32 fd1 = nla_get_u32(data[IFLA_GTP_FD1]); 1269 1270 sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp); 1271 if (IS_ERR(sk1u)) { 1272 gtp_encap_disable_sock(sk0); 1273 return PTR_ERR(sk1u); 1274 } 1275 } 1276 1277 gtp->sk0 = sk0; 1278 gtp->sk1u = sk1u; 1279 1280 return 0; 1281 } 1282 1283 static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[]) 1284 { 1285 struct gtp_dev *gtp = NULL; 1286 struct net_device *dev; 1287 struct net *net; 1288 1289 /* Examine the link attributes and figure out which network namespace 1290 * we are talking about. 1291 */ 1292 if (nla[GTPA_NET_NS_FD]) 1293 net = get_net_ns_by_fd(nla_get_u32(nla[GTPA_NET_NS_FD])); 1294 else 1295 net = get_net(src_net); 1296 1297 if (IS_ERR(net)) 1298 return NULL; 1299 1300 /* Check if there's an existing gtpX device to configure */ 1301 dev = dev_get_by_index_rcu(net, nla_get_u32(nla[GTPA_LINK])); 1302 if (dev && dev->netdev_ops == >p_netdev_ops) 1303 gtp = netdev_priv(dev); 1304 1305 put_net(net); 1306 return gtp; 1307 } 1308 1309 static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) 1310 { 1311 pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); 1312 pctx->af = AF_INET; 1313 pctx->peer_addr_ip4.s_addr = 1314 nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]); 1315 pctx->ms_addr_ip4.s_addr = 1316 nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); 1317 1318 switch (pctx->gtp_version) { 1319 case GTP_V0: 1320 /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow 1321 * label needs to be the same for uplink and downlink packets, 1322 * so let's annotate this. 1323 */ 1324 pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]); 1325 pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]); 1326 break; 1327 case GTP_V1: 1328 pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]); 1329 pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]); 1330 break; 1331 default: 1332 break; 1333 } 1334 } 1335 1336 static struct pdp_ctx *gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk, 1337 struct genl_info *info) 1338 { 1339 struct pdp_ctx *pctx, *pctx_tid = NULL; 1340 struct net_device *dev = gtp->dev; 1341 u32 hash_ms, hash_tid = 0; 1342 unsigned int version; 1343 bool found = false; 1344 __be32 ms_addr; 1345 1346 ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); 1347 hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size; 1348 version = nla_get_u32(info->attrs[GTPA_VERSION]); 1349 1350 pctx = ipv4_pdp_find(gtp, ms_addr); 1351 if (pctx) 1352 found = true; 1353 if (version == GTP_V0) 1354 pctx_tid = gtp0_pdp_find(gtp, 1355 nla_get_u64(info->attrs[GTPA_TID])); 1356 else if (version == GTP_V1) 1357 pctx_tid = gtp1_pdp_find(gtp, 1358 nla_get_u32(info->attrs[GTPA_I_TEI])); 1359 if (pctx_tid) 1360 found = true; 1361 1362 if (found) { 1363 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) 1364 return ERR_PTR(-EEXIST); 1365 if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE) 1366 return ERR_PTR(-EOPNOTSUPP); 1367 1368 if (pctx && pctx_tid) 1369 return ERR_PTR(-EEXIST); 1370 if (!pctx) 1371 pctx = pctx_tid; 1372 1373 ipv4_pdp_fill(pctx, info); 1374 1375 if (pctx->gtp_version == GTP_V0) 1376 netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n", 1377 pctx->u.v0.tid, pctx); 1378 else if (pctx->gtp_version == GTP_V1) 1379 netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n", 1380 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); 1381 1382 return pctx; 1383 1384 } 1385 1386 pctx = kmalloc(sizeof(*pctx), GFP_ATOMIC); 1387 if (pctx == NULL) 1388 return ERR_PTR(-ENOMEM); 1389 1390 sock_hold(sk); 1391 pctx->sk = sk; 1392 pctx->dev = gtp->dev; 1393 ipv4_pdp_fill(pctx, info); 1394 atomic_set(&pctx->tx_seq, 0); 1395 1396 switch (pctx->gtp_version) { 1397 case GTP_V0: 1398 /* TS 09.60: "The flow label identifies unambiguously a GTP 1399 * flow.". We use the tid for this instead, I cannot find a 1400 * situation in which this doesn't unambiguosly identify the 1401 * PDP context. 1402 */ 1403 hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size; 1404 break; 1405 case GTP_V1: 1406 hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size; 1407 break; 1408 } 1409 1410 hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]); 1411 hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]); 1412 1413 switch (pctx->gtp_version) { 1414 case GTP_V0: 1415 netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n", 1416 pctx->u.v0.tid, &pctx->peer_addr_ip4, 1417 &pctx->ms_addr_ip4, pctx); 1418 break; 1419 case GTP_V1: 1420 netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n", 1421 pctx->u.v1.i_tei, pctx->u.v1.o_tei, 1422 &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx); 1423 break; 1424 } 1425 1426 return pctx; 1427 } 1428 1429 static void pdp_context_free(struct rcu_head *head) 1430 { 1431 struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head); 1432 1433 sock_put(pctx->sk); 1434 kfree(pctx); 1435 } 1436 1437 static void pdp_context_delete(struct pdp_ctx *pctx) 1438 { 1439 hlist_del_rcu(&pctx->hlist_tid); 1440 hlist_del_rcu(&pctx->hlist_addr); 1441 call_rcu(&pctx->rcu_head, pdp_context_free); 1442 } 1443 1444 static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation); 1445 1446 static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) 1447 { 1448 unsigned int version; 1449 struct pdp_ctx *pctx; 1450 struct gtp_dev *gtp; 1451 struct sock *sk; 1452 int err; 1453 1454 if (!info->attrs[GTPA_VERSION] || 1455 !info->attrs[GTPA_LINK] || 1456 !info->attrs[GTPA_PEER_ADDRESS] || 1457 !info->attrs[GTPA_MS_ADDRESS]) 1458 return -EINVAL; 1459 1460 version = nla_get_u32(info->attrs[GTPA_VERSION]); 1461 1462 switch (version) { 1463 case GTP_V0: 1464 if (!info->attrs[GTPA_TID] || 1465 !info->attrs[GTPA_FLOW]) 1466 return -EINVAL; 1467 break; 1468 case GTP_V1: 1469 if (!info->attrs[GTPA_I_TEI] || 1470 !info->attrs[GTPA_O_TEI]) 1471 return -EINVAL; 1472 break; 1473 1474 default: 1475 return -EINVAL; 1476 } 1477 1478 rtnl_lock(); 1479 1480 gtp = gtp_find_dev(sock_net(skb->sk), info->attrs); 1481 if (!gtp) { 1482 err = -ENODEV; 1483 goto out_unlock; 1484 } 1485 1486 if (version == GTP_V0) 1487 sk = gtp->sk0; 1488 else if (version == GTP_V1) 1489 sk = gtp->sk1u; 1490 else 1491 sk = NULL; 1492 1493 if (!sk) { 1494 err = -ENODEV; 1495 goto out_unlock; 1496 } 1497 1498 pctx = gtp_pdp_add(gtp, sk, info); 1499 if (IS_ERR(pctx)) { 1500 err = PTR_ERR(pctx); 1501 } else { 1502 gtp_tunnel_notify(pctx, GTP_CMD_NEWPDP, GFP_KERNEL); 1503 err = 0; 1504 } 1505 1506 out_unlock: 1507 rtnl_unlock(); 1508 return err; 1509 } 1510 1511 static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net, 1512 struct nlattr *nla[]) 1513 { 1514 struct gtp_dev *gtp; 1515 1516 gtp = gtp_find_dev(net, nla); 1517 if (!gtp) 1518 return ERR_PTR(-ENODEV); 1519 1520 if (nla[GTPA_MS_ADDRESS]) { 1521 __be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]); 1522 1523 return ipv4_pdp_find(gtp, ip); 1524 } else if (nla[GTPA_VERSION]) { 1525 u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]); 1526 1527 if (gtp_version == GTP_V0 && nla[GTPA_TID]) 1528 return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID])); 1529 else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI]) 1530 return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI])); 1531 } 1532 1533 return ERR_PTR(-EINVAL); 1534 } 1535 1536 static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[]) 1537 { 1538 struct pdp_ctx *pctx; 1539 1540 if (nla[GTPA_LINK]) 1541 pctx = gtp_find_pdp_by_link(net, nla); 1542 else 1543 pctx = ERR_PTR(-EINVAL); 1544 1545 if (!pctx) 1546 pctx = ERR_PTR(-ENOENT); 1547 1548 return pctx; 1549 } 1550 1551 static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) 1552 { 1553 struct pdp_ctx *pctx; 1554 int err = 0; 1555 1556 if (!info->attrs[GTPA_VERSION]) 1557 return -EINVAL; 1558 1559 rcu_read_lock(); 1560 1561 pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); 1562 if (IS_ERR(pctx)) { 1563 err = PTR_ERR(pctx); 1564 goto out_unlock; 1565 } 1566 1567 if (pctx->gtp_version == GTP_V0) 1568 netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n", 1569 pctx->u.v0.tid, pctx); 1570 else if (pctx->gtp_version == GTP_V1) 1571 netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n", 1572 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); 1573 1574 gtp_tunnel_notify(pctx, GTP_CMD_DELPDP, GFP_ATOMIC); 1575 pdp_context_delete(pctx); 1576 1577 out_unlock: 1578 rcu_read_unlock(); 1579 return err; 1580 } 1581 1582 static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, 1583 int flags, u32 type, struct pdp_ctx *pctx) 1584 { 1585 void *genlh; 1586 1587 genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, flags, 1588 type); 1589 if (genlh == NULL) 1590 goto nlmsg_failure; 1591 1592 if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) || 1593 nla_put_u32(skb, GTPA_LINK, pctx->dev->ifindex) || 1594 nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) || 1595 nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr)) 1596 goto nla_put_failure; 1597 1598 switch (pctx->gtp_version) { 1599 case GTP_V0: 1600 if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) || 1601 nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow)) 1602 goto nla_put_failure; 1603 break; 1604 case GTP_V1: 1605 if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) || 1606 nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei)) 1607 goto nla_put_failure; 1608 break; 1609 } 1610 genlmsg_end(skb, genlh); 1611 return 0; 1612 1613 nlmsg_failure: 1614 nla_put_failure: 1615 genlmsg_cancel(skb, genlh); 1616 return -EMSGSIZE; 1617 } 1618 1619 static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation) 1620 { 1621 struct sk_buff *msg; 1622 int ret; 1623 1624 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, allocation); 1625 if (!msg) 1626 return -ENOMEM; 1627 1628 ret = gtp_genl_fill_info(msg, 0, 0, 0, cmd, pctx); 1629 if (ret < 0) { 1630 nlmsg_free(msg); 1631 return ret; 1632 } 1633 1634 ret = genlmsg_multicast_netns(>p_genl_family, dev_net(pctx->dev), msg, 1635 0, GTP_GENL_MCGRP, GFP_ATOMIC); 1636 return ret; 1637 } 1638 1639 static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) 1640 { 1641 struct pdp_ctx *pctx = NULL; 1642 struct sk_buff *skb2; 1643 int err; 1644 1645 if (!info->attrs[GTPA_VERSION]) 1646 return -EINVAL; 1647 1648 rcu_read_lock(); 1649 1650 pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); 1651 if (IS_ERR(pctx)) { 1652 err = PTR_ERR(pctx); 1653 goto err_unlock; 1654 } 1655 1656 skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 1657 if (skb2 == NULL) { 1658 err = -ENOMEM; 1659 goto err_unlock; 1660 } 1661 1662 err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, info->snd_seq, 1663 0, info->nlhdr->nlmsg_type, pctx); 1664 if (err < 0) 1665 goto err_unlock_free; 1666 1667 rcu_read_unlock(); 1668 return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid); 1669 1670 err_unlock_free: 1671 kfree_skb(skb2); 1672 err_unlock: 1673 rcu_read_unlock(); 1674 return err; 1675 } 1676 1677 static int gtp_genl_dump_pdp(struct sk_buff *skb, 1678 struct netlink_callback *cb) 1679 { 1680 struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp; 1681 int i, j, bucket = cb->args[0], skip = cb->args[1]; 1682 struct net *net = sock_net(skb->sk); 1683 struct pdp_ctx *pctx; 1684 struct gtp_net *gn; 1685 1686 gn = net_generic(net, gtp_net_id); 1687 1688 if (cb->args[4]) 1689 return 0; 1690 1691 rcu_read_lock(); 1692 list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { 1693 if (last_gtp && last_gtp != gtp) 1694 continue; 1695 else 1696 last_gtp = NULL; 1697 1698 for (i = bucket; i < gtp->hash_size; i++) { 1699 j = 0; 1700 hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], 1701 hlist_tid) { 1702 if (j >= skip && 1703 gtp_genl_fill_info(skb, 1704 NETLINK_CB(cb->skb).portid, 1705 cb->nlh->nlmsg_seq, 1706 NLM_F_MULTI, 1707 cb->nlh->nlmsg_type, pctx)) { 1708 cb->args[0] = i; 1709 cb->args[1] = j; 1710 cb->args[2] = (unsigned long)gtp; 1711 goto out; 1712 } 1713 j++; 1714 } 1715 skip = 0; 1716 } 1717 bucket = 0; 1718 } 1719 cb->args[4] = 1; 1720 out: 1721 rcu_read_unlock(); 1722 return skb->len; 1723 } 1724 1725 static int gtp_genl_send_echo_req(struct sk_buff *skb, struct genl_info *info) 1726 { 1727 struct sk_buff *skb_to_send; 1728 __be32 src_ip, dst_ip; 1729 unsigned int version; 1730 struct gtp_dev *gtp; 1731 struct flowi4 fl4; 1732 struct rtable *rt; 1733 struct sock *sk; 1734 __be16 port; 1735 int len; 1736 1737 if (!info->attrs[GTPA_VERSION] || 1738 !info->attrs[GTPA_LINK] || 1739 !info->attrs[GTPA_PEER_ADDRESS] || 1740 !info->attrs[GTPA_MS_ADDRESS]) 1741 return -EINVAL; 1742 1743 version = nla_get_u32(info->attrs[GTPA_VERSION]); 1744 dst_ip = nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]); 1745 src_ip = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); 1746 1747 gtp = gtp_find_dev(sock_net(skb->sk), info->attrs); 1748 if (!gtp) 1749 return -ENODEV; 1750 1751 if (!gtp->sk_created) 1752 return -EOPNOTSUPP; 1753 if (!(gtp->dev->flags & IFF_UP)) 1754 return -ENETDOWN; 1755 1756 if (version == GTP_V0) { 1757 struct gtp0_header *gtp0_h; 1758 1759 len = LL_RESERVED_SPACE(gtp->dev) + sizeof(struct gtp0_header) + 1760 sizeof(struct iphdr) + sizeof(struct udphdr); 1761 1762 skb_to_send = netdev_alloc_skb_ip_align(gtp->dev, len); 1763 if (!skb_to_send) 1764 return -ENOMEM; 1765 1766 sk = gtp->sk0; 1767 port = htons(GTP0_PORT); 1768 1769 gtp0_h = skb_push(skb_to_send, sizeof(struct gtp0_header)); 1770 memset(gtp0_h, 0, sizeof(struct gtp0_header)); 1771 gtp0_build_echo_msg(gtp0_h, GTP_ECHO_REQ); 1772 } else if (version == GTP_V1) { 1773 struct gtp1_header_long *gtp1u_h; 1774 1775 len = LL_RESERVED_SPACE(gtp->dev) + 1776 sizeof(struct gtp1_header_long) + 1777 sizeof(struct iphdr) + sizeof(struct udphdr); 1778 1779 skb_to_send = netdev_alloc_skb_ip_align(gtp->dev, len); 1780 if (!skb_to_send) 1781 return -ENOMEM; 1782 1783 sk = gtp->sk1u; 1784 port = htons(GTP1U_PORT); 1785 1786 gtp1u_h = skb_push(skb_to_send, 1787 sizeof(struct gtp1_header_long)); 1788 memset(gtp1u_h, 0, sizeof(struct gtp1_header_long)); 1789 gtp1u_build_echo_msg(gtp1u_h, GTP_ECHO_REQ); 1790 } else { 1791 return -ENODEV; 1792 } 1793 1794 rt = ip4_route_output_gtp(&fl4, sk, dst_ip, src_ip); 1795 if (IS_ERR(rt)) { 1796 netdev_dbg(gtp->dev, "no route for echo request to %pI4\n", 1797 &dst_ip); 1798 kfree_skb(skb_to_send); 1799 return -ENODEV; 1800 } 1801 1802 udp_tunnel_xmit_skb(rt, sk, skb_to_send, 1803 fl4.saddr, fl4.daddr, 1804 fl4.flowi4_tos, 1805 ip4_dst_hoplimit(&rt->dst), 1806 0, 1807 port, port, 1808 !net_eq(sock_net(sk), 1809 dev_net(gtp->dev)), 1810 false); 1811 return 0; 1812 } 1813 1814 static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = { 1815 [GTPA_LINK] = { .type = NLA_U32, }, 1816 [GTPA_VERSION] = { .type = NLA_U32, }, 1817 [GTPA_TID] = { .type = NLA_U64, }, 1818 [GTPA_PEER_ADDRESS] = { .type = NLA_U32, }, 1819 [GTPA_MS_ADDRESS] = { .type = NLA_U32, }, 1820 [GTPA_FLOW] = { .type = NLA_U16, }, 1821 [GTPA_NET_NS_FD] = { .type = NLA_U32, }, 1822 [GTPA_I_TEI] = { .type = NLA_U32, }, 1823 [GTPA_O_TEI] = { .type = NLA_U32, }, 1824 }; 1825 1826 static const struct genl_small_ops gtp_genl_ops[] = { 1827 { 1828 .cmd = GTP_CMD_NEWPDP, 1829 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1830 .doit = gtp_genl_new_pdp, 1831 .flags = GENL_ADMIN_PERM, 1832 }, 1833 { 1834 .cmd = GTP_CMD_DELPDP, 1835 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1836 .doit = gtp_genl_del_pdp, 1837 .flags = GENL_ADMIN_PERM, 1838 }, 1839 { 1840 .cmd = GTP_CMD_GETPDP, 1841 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1842 .doit = gtp_genl_get_pdp, 1843 .dumpit = gtp_genl_dump_pdp, 1844 .flags = GENL_ADMIN_PERM, 1845 }, 1846 { 1847 .cmd = GTP_CMD_ECHOREQ, 1848 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1849 .doit = gtp_genl_send_echo_req, 1850 .flags = GENL_ADMIN_PERM, 1851 }, 1852 }; 1853 1854 static struct genl_family gtp_genl_family __ro_after_init = { 1855 .name = "gtp", 1856 .version = 0, 1857 .hdrsize = 0, 1858 .maxattr = GTPA_MAX, 1859 .policy = gtp_genl_policy, 1860 .netnsok = true, 1861 .module = THIS_MODULE, 1862 .small_ops = gtp_genl_ops, 1863 .n_small_ops = ARRAY_SIZE(gtp_genl_ops), 1864 .resv_start_op = GTP_CMD_ECHOREQ + 1, 1865 .mcgrps = gtp_genl_mcgrps, 1866 .n_mcgrps = ARRAY_SIZE(gtp_genl_mcgrps), 1867 }; 1868 1869 static int __net_init gtp_net_init(struct net *net) 1870 { 1871 struct gtp_net *gn = net_generic(net, gtp_net_id); 1872 1873 INIT_LIST_HEAD(&gn->gtp_dev_list); 1874 return 0; 1875 } 1876 1877 static void __net_exit gtp_net_exit(struct net *net) 1878 { 1879 struct gtp_net *gn = net_generic(net, gtp_net_id); 1880 struct gtp_dev *gtp; 1881 LIST_HEAD(list); 1882 1883 rtnl_lock(); 1884 list_for_each_entry(gtp, &gn->gtp_dev_list, list) 1885 gtp_dellink(gtp->dev, &list); 1886 1887 unregister_netdevice_many(&list); 1888 rtnl_unlock(); 1889 } 1890 1891 static struct pernet_operations gtp_net_ops = { 1892 .init = gtp_net_init, 1893 .exit = gtp_net_exit, 1894 .id = >p_net_id, 1895 .size = sizeof(struct gtp_net), 1896 }; 1897 1898 static int __init gtp_init(void) 1899 { 1900 int err; 1901 1902 get_random_bytes(>p_h_initval, sizeof(gtp_h_initval)); 1903 1904 err = rtnl_link_register(>p_link_ops); 1905 if (err < 0) 1906 goto error_out; 1907 1908 err = genl_register_family(>p_genl_family); 1909 if (err < 0) 1910 goto unreg_rtnl_link; 1911 1912 err = register_pernet_subsys(>p_net_ops); 1913 if (err < 0) 1914 goto unreg_genl_family; 1915 1916 pr_info("GTP module loaded (pdp ctx size %zd bytes)\n", 1917 sizeof(struct pdp_ctx)); 1918 return 0; 1919 1920 unreg_genl_family: 1921 genl_unregister_family(>p_genl_family); 1922 unreg_rtnl_link: 1923 rtnl_link_unregister(>p_link_ops); 1924 error_out: 1925 pr_err("error loading GTP module loaded\n"); 1926 return err; 1927 } 1928 late_initcall(gtp_init); 1929 1930 static void __exit gtp_fini(void) 1931 { 1932 genl_unregister_family(>p_genl_family); 1933 rtnl_link_unregister(>p_link_ops); 1934 unregister_pernet_subsys(>p_net_ops); 1935 1936 pr_info("GTP module unloaded\n"); 1937 } 1938 module_exit(gtp_fini); 1939 1940 MODULE_LICENSE("GPL"); 1941 MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>"); 1942 MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic"); 1943 MODULE_ALIAS_RTNL_LINK("gtp"); 1944 MODULE_ALIAS_GENL_FAMILY("gtp"); 1945