1 /* GTP according to GSM TS 09.60 / 3GPP TS 29.060 2 * 3 * (C) 2012-2014 by sysmocom - s.f.m.c. GmbH 4 * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org> 5 * 6 * Author: Harald Welte <hwelte@sysmocom.de> 7 * Pablo Neira Ayuso <pablo@netfilter.org> 8 * Andreas Schultz <aschultz@travelping.com> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18 #include <linux/module.h> 19 #include <linux/skbuff.h> 20 #include <linux/udp.h> 21 #include <linux/rculist.h> 22 #include <linux/jhash.h> 23 #include <linux/if_tunnel.h> 24 #include <linux/net.h> 25 #include <linux/file.h> 26 #include <linux/gtp.h> 27 28 #include <net/net_namespace.h> 29 #include <net/protocol.h> 30 #include <net/ip.h> 31 #include <net/udp.h> 32 #include <net/udp_tunnel.h> 33 #include <net/icmp.h> 34 #include <net/xfrm.h> 35 #include <net/genetlink.h> 36 #include <net/netns/generic.h> 37 #include <net/gtp.h> 38 39 /* An active session for the subscriber. */ 40 struct pdp_ctx { 41 struct hlist_node hlist_tid; 42 struct hlist_node hlist_addr; 43 44 union { 45 u64 tid; 46 struct { 47 u64 tid; 48 u16 flow; 49 } v0; 50 struct { 51 u32 i_tei; 52 u32 o_tei; 53 } v1; 54 } u; 55 u8 gtp_version; 56 u16 af; 57 58 struct in_addr ms_addr_ip4; 59 struct in_addr sgsn_addr_ip4; 60 61 atomic_t tx_seq; 62 struct rcu_head rcu_head; 63 }; 64 65 /* One instance of the GTP device. */ 66 struct gtp_dev { 67 struct list_head list; 68 69 struct socket *sock0; 70 struct socket *sock1u; 71 72 struct net_device *dev; 73 74 unsigned int hash_size; 75 struct hlist_head *tid_hash; 76 struct hlist_head *addr_hash; 77 }; 78 79 static unsigned int gtp_net_id __read_mostly; 80 81 struct gtp_net { 82 struct list_head gtp_dev_list; 83 }; 84 85 static u32 gtp_h_initval; 86 87 static inline u32 gtp0_hashfn(u64 tid) 88 { 89 u32 *tid32 = (u32 *) &tid; 90 return jhash_2words(tid32[0], tid32[1], gtp_h_initval); 91 } 92 93 static inline u32 gtp1u_hashfn(u32 tid) 94 { 95 return jhash_1word(tid, gtp_h_initval); 96 } 97 98 static inline u32 ipv4_hashfn(__be32 ip) 99 { 100 return jhash_1word((__force u32)ip, gtp_h_initval); 101 } 102 103 /* Resolve a PDP context structure based on the 64bit TID. */ 104 static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid) 105 { 106 struct hlist_head *head; 107 struct pdp_ctx *pdp; 108 109 head = >p->tid_hash[gtp0_hashfn(tid) % gtp->hash_size]; 110 111 hlist_for_each_entry_rcu(pdp, head, hlist_tid) { 112 if (pdp->gtp_version == GTP_V0 && 113 pdp->u.v0.tid == tid) 114 return pdp; 115 } 116 return NULL; 117 } 118 119 /* Resolve a PDP context structure based on the 32bit TEI. */ 120 static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid) 121 { 122 struct hlist_head *head; 123 struct pdp_ctx *pdp; 124 125 head = >p->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size]; 126 127 hlist_for_each_entry_rcu(pdp, head, hlist_tid) { 128 if (pdp->gtp_version == GTP_V1 && 129 pdp->u.v1.i_tei == tid) 130 return pdp; 131 } 132 return NULL; 133 } 134 135 /* Resolve a PDP context based on IPv4 address of MS. */ 136 static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr) 137 { 138 struct hlist_head *head; 139 struct pdp_ctx *pdp; 140 141 head = >p->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size]; 142 143 hlist_for_each_entry_rcu(pdp, head, hlist_addr) { 144 if (pdp->af == AF_INET && 145 pdp->ms_addr_ip4.s_addr == ms_addr) 146 return pdp; 147 } 148 149 return NULL; 150 } 151 152 static bool gtp_check_src_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx, 153 unsigned int hdrlen) 154 { 155 struct iphdr *iph; 156 157 if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr))) 158 return false; 159 160 iph = (struct iphdr *)(skb->data + hdrlen); 161 162 return iph->saddr == pctx->ms_addr_ip4.s_addr; 163 } 164 165 /* Check if the inner IP source address in this packet is assigned to any 166 * existing mobile subscriber. 167 */ 168 static bool gtp_check_src_ms(struct sk_buff *skb, struct pdp_ctx *pctx, 169 unsigned int hdrlen) 170 { 171 switch (ntohs(skb->protocol)) { 172 case ETH_P_IP: 173 return gtp_check_src_ms_ipv4(skb, pctx, hdrlen); 174 } 175 return false; 176 } 177 178 /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */ 179 static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, 180 bool xnet) 181 { 182 unsigned int hdrlen = sizeof(struct udphdr) + 183 sizeof(struct gtp0_header); 184 struct gtp0_header *gtp0; 185 struct pdp_ctx *pctx; 186 187 if (!pskb_may_pull(skb, hdrlen)) 188 return -1; 189 190 gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); 191 192 if ((gtp0->flags >> 5) != GTP_V0) 193 return 1; 194 195 if (gtp0->type != GTP_TPDU) 196 return 1; 197 198 pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid)); 199 if (!pctx) { 200 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); 201 return 1; 202 } 203 204 if (!gtp_check_src_ms(skb, pctx, hdrlen)) { 205 netdev_dbg(gtp->dev, "No PDP ctx for this MS\n"); 206 return 1; 207 } 208 209 /* Get rid of the GTP + UDP headers. */ 210 return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet); 211 } 212 213 static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, 214 bool xnet) 215 { 216 unsigned int hdrlen = sizeof(struct udphdr) + 217 sizeof(struct gtp1_header); 218 struct gtp1_header *gtp1; 219 struct pdp_ctx *pctx; 220 221 if (!pskb_may_pull(skb, hdrlen)) 222 return -1; 223 224 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); 225 226 if ((gtp1->flags >> 5) != GTP_V1) 227 return 1; 228 229 if (gtp1->type != GTP_TPDU) 230 return 1; 231 232 /* From 29.060: "This field shall be present if and only if any one or 233 * more of the S, PN and E flags are set.". 234 * 235 * If any of the bit is set, then the remaining ones also have to be 236 * set. 237 */ 238 if (gtp1->flags & GTP1_F_MASK) 239 hdrlen += 4; 240 241 /* Make sure the header is larger enough, including extensions. */ 242 if (!pskb_may_pull(skb, hdrlen)) 243 return -1; 244 245 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); 246 247 pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid)); 248 if (!pctx) { 249 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); 250 return 1; 251 } 252 253 if (!gtp_check_src_ms(skb, pctx, hdrlen)) { 254 netdev_dbg(gtp->dev, "No PDP ctx for this MS\n"); 255 return 1; 256 } 257 258 /* Get rid of the GTP + UDP headers. */ 259 return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet); 260 } 261 262 static void gtp_encap_disable(struct gtp_dev *gtp) 263 { 264 if (gtp->sock0 && gtp->sock0->sk) { 265 udp_sk(gtp->sock0->sk)->encap_type = 0; 266 rcu_assign_sk_user_data(gtp->sock0->sk, NULL); 267 } 268 if (gtp->sock1u && gtp->sock1u->sk) { 269 udp_sk(gtp->sock1u->sk)->encap_type = 0; 270 rcu_assign_sk_user_data(gtp->sock1u->sk, NULL); 271 } 272 273 gtp->sock0 = NULL; 274 gtp->sock1u = NULL; 275 } 276 277 static void gtp_encap_destroy(struct sock *sk) 278 { 279 struct gtp_dev *gtp; 280 281 gtp = rcu_dereference_sk_user_data(sk); 282 if (gtp) 283 gtp_encap_disable(gtp); 284 } 285 286 /* UDP encapsulation receive handler. See net/ipv4/udp.c. 287 * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket. 288 */ 289 static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) 290 { 291 struct pcpu_sw_netstats *stats; 292 struct gtp_dev *gtp; 293 bool xnet; 294 int ret; 295 296 gtp = rcu_dereference_sk_user_data(sk); 297 if (!gtp) 298 return 1; 299 300 netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); 301 302 xnet = !net_eq(sock_net(sk), dev_net(gtp->dev)); 303 304 switch (udp_sk(sk)->encap_type) { 305 case UDP_ENCAP_GTP0: 306 netdev_dbg(gtp->dev, "received GTP0 packet\n"); 307 ret = gtp0_udp_encap_recv(gtp, skb, xnet); 308 break; 309 case UDP_ENCAP_GTP1U: 310 netdev_dbg(gtp->dev, "received GTP1U packet\n"); 311 ret = gtp1u_udp_encap_recv(gtp, skb, xnet); 312 break; 313 default: 314 ret = -1; /* Shouldn't happen. */ 315 } 316 317 switch (ret) { 318 case 1: 319 netdev_dbg(gtp->dev, "pass up to the process\n"); 320 return 1; 321 case 0: 322 netdev_dbg(gtp->dev, "forwarding packet from GGSN to uplink\n"); 323 break; 324 case -1: 325 netdev_dbg(gtp->dev, "GTP packet has been dropped\n"); 326 kfree_skb(skb); 327 return 0; 328 } 329 330 /* Now that the UDP and the GTP header have been removed, set up the 331 * new network header. This is required by the upper layer to 332 * calculate the transport header. 333 */ 334 skb_reset_network_header(skb); 335 336 skb->dev = gtp->dev; 337 338 stats = this_cpu_ptr(gtp->dev->tstats); 339 u64_stats_update_begin(&stats->syncp); 340 stats->rx_packets++; 341 stats->rx_bytes += skb->len; 342 u64_stats_update_end(&stats->syncp); 343 344 netif_rx(skb); 345 346 return 0; 347 } 348 349 static int gtp_dev_init(struct net_device *dev) 350 { 351 struct gtp_dev *gtp = netdev_priv(dev); 352 353 gtp->dev = dev; 354 355 dev->tstats = alloc_percpu(struct pcpu_sw_netstats); 356 if (!dev->tstats) 357 return -ENOMEM; 358 359 return 0; 360 } 361 362 static void gtp_dev_uninit(struct net_device *dev) 363 { 364 struct gtp_dev *gtp = netdev_priv(dev); 365 366 gtp_encap_disable(gtp); 367 free_percpu(dev->tstats); 368 } 369 370 static struct rtable *ip4_route_output_gtp(struct net *net, struct flowi4 *fl4, 371 const struct sock *sk, __be32 daddr) 372 { 373 memset(fl4, 0, sizeof(*fl4)); 374 fl4->flowi4_oif = sk->sk_bound_dev_if; 375 fl4->daddr = daddr; 376 fl4->saddr = inet_sk(sk)->inet_saddr; 377 fl4->flowi4_tos = RT_CONN_FLAGS(sk); 378 fl4->flowi4_proto = sk->sk_protocol; 379 380 return ip_route_output_key(net, fl4); 381 } 382 383 static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) 384 { 385 int payload_len = skb->len; 386 struct gtp0_header *gtp0; 387 388 gtp0 = (struct gtp0_header *) skb_push(skb, sizeof(*gtp0)); 389 390 gtp0->flags = 0x1e; /* v0, GTP-non-prime. */ 391 gtp0->type = GTP_TPDU; 392 gtp0->length = htons(payload_len); 393 gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff); 394 gtp0->flow = htons(pctx->u.v0.flow); 395 gtp0->number = 0xff; 396 gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff; 397 gtp0->tid = cpu_to_be64(pctx->u.v0.tid); 398 } 399 400 static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) 401 { 402 int payload_len = skb->len; 403 struct gtp1_header *gtp1; 404 405 gtp1 = (struct gtp1_header *) skb_push(skb, sizeof(*gtp1)); 406 407 /* Bits 8 7 6 5 4 3 2 1 408 * +--+--+--+--+--+--+--+--+ 409 * |version |PT| 0| E| S|PN| 410 * +--+--+--+--+--+--+--+--+ 411 * 0 0 1 1 1 0 0 0 412 */ 413 gtp1->flags = 0x30; /* v1, GTP-non-prime. */ 414 gtp1->type = GTP_TPDU; 415 gtp1->length = htons(payload_len); 416 gtp1->tid = htonl(pctx->u.v1.o_tei); 417 418 /* TODO: Suppport for extension header, sequence number and N-PDU. 419 * Update the length field if any of them is available. 420 */ 421 } 422 423 struct gtp_pktinfo { 424 struct sock *sk; 425 struct iphdr *iph; 426 struct flowi4 fl4; 427 struct rtable *rt; 428 struct pdp_ctx *pctx; 429 struct net_device *dev; 430 __be16 gtph_port; 431 }; 432 433 static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo) 434 { 435 switch (pktinfo->pctx->gtp_version) { 436 case GTP_V0: 437 pktinfo->gtph_port = htons(GTP0_PORT); 438 gtp0_push_header(skb, pktinfo->pctx); 439 break; 440 case GTP_V1: 441 pktinfo->gtph_port = htons(GTP1U_PORT); 442 gtp1_push_header(skb, pktinfo->pctx); 443 break; 444 } 445 } 446 447 static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, 448 struct sock *sk, struct iphdr *iph, 449 struct pdp_ctx *pctx, struct rtable *rt, 450 struct flowi4 *fl4, 451 struct net_device *dev) 452 { 453 pktinfo->sk = sk; 454 pktinfo->iph = iph; 455 pktinfo->pctx = pctx; 456 pktinfo->rt = rt; 457 pktinfo->fl4 = *fl4; 458 pktinfo->dev = dev; 459 } 460 461 static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, 462 struct gtp_pktinfo *pktinfo) 463 { 464 struct gtp_dev *gtp = netdev_priv(dev); 465 struct pdp_ctx *pctx; 466 struct rtable *rt; 467 struct flowi4 fl4; 468 struct iphdr *iph; 469 struct sock *sk; 470 __be16 df; 471 int mtu; 472 473 /* Read the IP destination address and resolve the PDP context. 474 * Prepend PDP header with TEI/TID from PDP ctx. 475 */ 476 iph = ip_hdr(skb); 477 pctx = ipv4_pdp_find(gtp, iph->daddr); 478 if (!pctx) { 479 netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", 480 &iph->daddr); 481 return -ENOENT; 482 } 483 netdev_dbg(dev, "found PDP context %p\n", pctx); 484 485 switch (pctx->gtp_version) { 486 case GTP_V0: 487 if (gtp->sock0) 488 sk = gtp->sock0->sk; 489 else 490 sk = NULL; 491 break; 492 case GTP_V1: 493 if (gtp->sock1u) 494 sk = gtp->sock1u->sk; 495 else 496 sk = NULL; 497 break; 498 default: 499 return -ENOENT; 500 } 501 502 if (!sk) { 503 netdev_dbg(dev, "no userspace socket is available, skip\n"); 504 return -ENOENT; 505 } 506 507 rt = ip4_route_output_gtp(sock_net(sk), &fl4, gtp->sock0->sk, 508 pctx->sgsn_addr_ip4.s_addr); 509 if (IS_ERR(rt)) { 510 netdev_dbg(dev, "no route to SSGN %pI4\n", 511 &pctx->sgsn_addr_ip4.s_addr); 512 dev->stats.tx_carrier_errors++; 513 goto err; 514 } 515 516 if (rt->dst.dev == dev) { 517 netdev_dbg(dev, "circular route to SSGN %pI4\n", 518 &pctx->sgsn_addr_ip4.s_addr); 519 dev->stats.collisions++; 520 goto err_rt; 521 } 522 523 skb_dst_drop(skb); 524 525 /* This is similar to tnl_update_pmtu(). */ 526 df = iph->frag_off; 527 if (df) { 528 mtu = dst_mtu(&rt->dst) - dev->hard_header_len - 529 sizeof(struct iphdr) - sizeof(struct udphdr); 530 switch (pctx->gtp_version) { 531 case GTP_V0: 532 mtu -= sizeof(struct gtp0_header); 533 break; 534 case GTP_V1: 535 mtu -= sizeof(struct gtp1_header); 536 break; 537 } 538 } else { 539 mtu = dst_mtu(&rt->dst); 540 } 541 542 rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu); 543 544 if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) && 545 mtu < ntohs(iph->tot_len)) { 546 netdev_dbg(dev, "packet too big, fragmentation needed\n"); 547 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 548 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 549 htonl(mtu)); 550 goto err_rt; 551 } 552 553 gtp_set_pktinfo_ipv4(pktinfo, sk, iph, pctx, rt, &fl4, dev); 554 gtp_push_header(skb, pktinfo); 555 556 return 0; 557 err_rt: 558 ip_rt_put(rt); 559 err: 560 return -EBADMSG; 561 } 562 563 static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) 564 { 565 unsigned int proto = ntohs(skb->protocol); 566 struct gtp_pktinfo pktinfo; 567 int err; 568 569 /* Ensure there is sufficient headroom. */ 570 if (skb_cow_head(skb, dev->needed_headroom)) 571 goto tx_err; 572 573 skb_reset_inner_headers(skb); 574 575 /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */ 576 rcu_read_lock(); 577 switch (proto) { 578 case ETH_P_IP: 579 err = gtp_build_skb_ip4(skb, dev, &pktinfo); 580 break; 581 default: 582 err = -EOPNOTSUPP; 583 break; 584 } 585 rcu_read_unlock(); 586 587 if (err < 0) 588 goto tx_err; 589 590 switch (proto) { 591 case ETH_P_IP: 592 netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n", 593 &pktinfo.iph->saddr, &pktinfo.iph->daddr); 594 udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, 595 pktinfo.fl4.saddr, pktinfo.fl4.daddr, 596 pktinfo.iph->tos, 597 ip4_dst_hoplimit(&pktinfo.rt->dst), 598 0, 599 pktinfo.gtph_port, pktinfo.gtph_port, 600 true, false); 601 break; 602 } 603 604 return NETDEV_TX_OK; 605 tx_err: 606 dev->stats.tx_errors++; 607 dev_kfree_skb(skb); 608 return NETDEV_TX_OK; 609 } 610 611 static const struct net_device_ops gtp_netdev_ops = { 612 .ndo_init = gtp_dev_init, 613 .ndo_uninit = gtp_dev_uninit, 614 .ndo_start_xmit = gtp_dev_xmit, 615 .ndo_get_stats64 = ip_tunnel_get_stats64, 616 }; 617 618 static void gtp_link_setup(struct net_device *dev) 619 { 620 dev->netdev_ops = >p_netdev_ops; 621 dev->destructor = free_netdev; 622 623 dev->hard_header_len = 0; 624 dev->addr_len = 0; 625 626 /* Zero header length. */ 627 dev->type = ARPHRD_NONE; 628 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 629 630 dev->priv_flags |= IFF_NO_QUEUE; 631 dev->features |= NETIF_F_LLTX; 632 netif_keep_dst(dev); 633 634 /* Assume largest header, ie. GTPv0. */ 635 dev->needed_headroom = LL_MAX_HEADER + 636 sizeof(struct iphdr) + 637 sizeof(struct udphdr) + 638 sizeof(struct gtp0_header); 639 } 640 641 static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); 642 static void gtp_hashtable_free(struct gtp_dev *gtp); 643 static int gtp_encap_enable(struct net_device *dev, struct gtp_dev *gtp, 644 int fd_gtp0, int fd_gtp1); 645 646 static int gtp_newlink(struct net *src_net, struct net_device *dev, 647 struct nlattr *tb[], struct nlattr *data[]) 648 { 649 int hashsize, err, fd0, fd1; 650 struct gtp_dev *gtp; 651 struct gtp_net *gn; 652 653 if (!data[IFLA_GTP_FD0] || !data[IFLA_GTP_FD1]) 654 return -EINVAL; 655 656 gtp = netdev_priv(dev); 657 658 fd0 = nla_get_u32(data[IFLA_GTP_FD0]); 659 fd1 = nla_get_u32(data[IFLA_GTP_FD1]); 660 661 err = gtp_encap_enable(dev, gtp, fd0, fd1); 662 if (err < 0) 663 goto out_err; 664 665 if (!data[IFLA_GTP_PDP_HASHSIZE]) 666 hashsize = 1024; 667 else 668 hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]); 669 670 err = gtp_hashtable_new(gtp, hashsize); 671 if (err < 0) 672 goto out_encap; 673 674 err = register_netdevice(dev); 675 if (err < 0) { 676 netdev_dbg(dev, "failed to register new netdev %d\n", err); 677 goto out_hashtable; 678 } 679 680 gn = net_generic(dev_net(dev), gtp_net_id); 681 list_add_rcu(>p->list, &gn->gtp_dev_list); 682 683 netdev_dbg(dev, "registered new GTP interface\n"); 684 685 return 0; 686 687 out_hashtable: 688 gtp_hashtable_free(gtp); 689 out_encap: 690 gtp_encap_disable(gtp); 691 out_err: 692 return err; 693 } 694 695 static void gtp_dellink(struct net_device *dev, struct list_head *head) 696 { 697 struct gtp_dev *gtp = netdev_priv(dev); 698 699 gtp_encap_disable(gtp); 700 gtp_hashtable_free(gtp); 701 list_del_rcu(>p->list); 702 unregister_netdevice_queue(dev, head); 703 } 704 705 static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = { 706 [IFLA_GTP_FD0] = { .type = NLA_U32 }, 707 [IFLA_GTP_FD1] = { .type = NLA_U32 }, 708 [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 }, 709 }; 710 711 static int gtp_validate(struct nlattr *tb[], struct nlattr *data[]) 712 { 713 if (!data) 714 return -EINVAL; 715 716 return 0; 717 } 718 719 static size_t gtp_get_size(const struct net_device *dev) 720 { 721 return nla_total_size(sizeof(__u32)); /* IFLA_GTP_PDP_HASHSIZE */ 722 } 723 724 static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) 725 { 726 struct gtp_dev *gtp = netdev_priv(dev); 727 728 if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size)) 729 goto nla_put_failure; 730 731 return 0; 732 733 nla_put_failure: 734 return -EMSGSIZE; 735 } 736 737 static struct rtnl_link_ops gtp_link_ops __read_mostly = { 738 .kind = "gtp", 739 .maxtype = IFLA_GTP_MAX, 740 .policy = gtp_policy, 741 .priv_size = sizeof(struct gtp_dev), 742 .setup = gtp_link_setup, 743 .validate = gtp_validate, 744 .newlink = gtp_newlink, 745 .dellink = gtp_dellink, 746 .get_size = gtp_get_size, 747 .fill_info = gtp_fill_info, 748 }; 749 750 static struct net *gtp_genl_get_net(struct net *src_net, struct nlattr *tb[]) 751 { 752 struct net *net; 753 754 /* Examine the link attributes and figure out which network namespace 755 * we are talking about. 756 */ 757 if (tb[GTPA_NET_NS_FD]) 758 net = get_net_ns_by_fd(nla_get_u32(tb[GTPA_NET_NS_FD])); 759 else 760 net = get_net(src_net); 761 762 return net; 763 } 764 765 static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) 766 { 767 int i; 768 769 gtp->addr_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL); 770 if (gtp->addr_hash == NULL) 771 return -ENOMEM; 772 773 gtp->tid_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL); 774 if (gtp->tid_hash == NULL) 775 goto err1; 776 777 gtp->hash_size = hsize; 778 779 for (i = 0; i < hsize; i++) { 780 INIT_HLIST_HEAD(>p->addr_hash[i]); 781 INIT_HLIST_HEAD(>p->tid_hash[i]); 782 } 783 return 0; 784 err1: 785 kfree(gtp->addr_hash); 786 return -ENOMEM; 787 } 788 789 static void gtp_hashtable_free(struct gtp_dev *gtp) 790 { 791 struct pdp_ctx *pctx; 792 int i; 793 794 for (i = 0; i < gtp->hash_size; i++) { 795 hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) { 796 hlist_del_rcu(&pctx->hlist_tid); 797 hlist_del_rcu(&pctx->hlist_addr); 798 kfree_rcu(pctx, rcu_head); 799 } 800 } 801 synchronize_rcu(); 802 kfree(gtp->addr_hash); 803 kfree(gtp->tid_hash); 804 } 805 806 static int gtp_encap_enable(struct net_device *dev, struct gtp_dev *gtp, 807 int fd_gtp0, int fd_gtp1) 808 { 809 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 810 struct socket *sock0, *sock1u; 811 int err; 812 813 netdev_dbg(dev, "enable gtp on %d, %d\n", fd_gtp0, fd_gtp1); 814 815 sock0 = sockfd_lookup(fd_gtp0, &err); 816 if (sock0 == NULL) { 817 netdev_dbg(dev, "socket fd=%d not found (gtp0)\n", fd_gtp0); 818 return -ENOENT; 819 } 820 821 if (sock0->sk->sk_protocol != IPPROTO_UDP) { 822 netdev_dbg(dev, "socket fd=%d not UDP\n", fd_gtp0); 823 err = -EINVAL; 824 goto err1; 825 } 826 827 sock1u = sockfd_lookup(fd_gtp1, &err); 828 if (sock1u == NULL) { 829 netdev_dbg(dev, "socket fd=%d not found (gtp1u)\n", fd_gtp1); 830 err = -ENOENT; 831 goto err1; 832 } 833 834 if (sock1u->sk->sk_protocol != IPPROTO_UDP) { 835 netdev_dbg(dev, "socket fd=%d not UDP\n", fd_gtp1); 836 err = -EINVAL; 837 goto err2; 838 } 839 840 netdev_dbg(dev, "enable gtp on %p, %p\n", sock0, sock1u); 841 842 gtp->sock0 = sock0; 843 gtp->sock1u = sock1u; 844 845 tuncfg.sk_user_data = gtp; 846 tuncfg.encap_rcv = gtp_encap_recv; 847 tuncfg.encap_destroy = gtp_encap_destroy; 848 849 tuncfg.encap_type = UDP_ENCAP_GTP0; 850 setup_udp_tunnel_sock(sock_net(gtp->sock0->sk), gtp->sock0, &tuncfg); 851 852 tuncfg.encap_type = UDP_ENCAP_GTP1U; 853 setup_udp_tunnel_sock(sock_net(gtp->sock1u->sk), gtp->sock1u, &tuncfg); 854 855 err = 0; 856 err2: 857 sockfd_put(sock1u); 858 err1: 859 sockfd_put(sock0); 860 return err; 861 } 862 863 static struct net_device *gtp_find_dev(struct net *net, int ifindex) 864 { 865 struct gtp_net *gn = net_generic(net, gtp_net_id); 866 struct gtp_dev *gtp; 867 868 list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { 869 if (ifindex == gtp->dev->ifindex) 870 return gtp->dev; 871 } 872 return NULL; 873 } 874 875 static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) 876 { 877 pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); 878 pctx->af = AF_INET; 879 pctx->sgsn_addr_ip4.s_addr = 880 nla_get_be32(info->attrs[GTPA_SGSN_ADDRESS]); 881 pctx->ms_addr_ip4.s_addr = 882 nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); 883 884 switch (pctx->gtp_version) { 885 case GTP_V0: 886 /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow 887 * label needs to be the same for uplink and downlink packets, 888 * so let's annotate this. 889 */ 890 pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]); 891 pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]); 892 break; 893 case GTP_V1: 894 pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]); 895 pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]); 896 break; 897 default: 898 break; 899 } 900 } 901 902 static int ipv4_pdp_add(struct net_device *dev, struct genl_info *info) 903 { 904 struct gtp_dev *gtp = netdev_priv(dev); 905 u32 hash_ms, hash_tid = 0; 906 struct pdp_ctx *pctx; 907 bool found = false; 908 __be32 ms_addr; 909 910 ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); 911 hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size; 912 913 hlist_for_each_entry_rcu(pctx, >p->addr_hash[hash_ms], hlist_addr) { 914 if (pctx->ms_addr_ip4.s_addr == ms_addr) { 915 found = true; 916 break; 917 } 918 } 919 920 if (found) { 921 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) 922 return -EEXIST; 923 if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE) 924 return -EOPNOTSUPP; 925 926 ipv4_pdp_fill(pctx, info); 927 928 if (pctx->gtp_version == GTP_V0) 929 netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n", 930 pctx->u.v0.tid, pctx); 931 else if (pctx->gtp_version == GTP_V1) 932 netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n", 933 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); 934 935 return 0; 936 937 } 938 939 pctx = kmalloc(sizeof(struct pdp_ctx), GFP_KERNEL); 940 if (pctx == NULL) 941 return -ENOMEM; 942 943 ipv4_pdp_fill(pctx, info); 944 atomic_set(&pctx->tx_seq, 0); 945 946 switch (pctx->gtp_version) { 947 case GTP_V0: 948 /* TS 09.60: "The flow label identifies unambiguously a GTP 949 * flow.". We use the tid for this instead, I cannot find a 950 * situation in which this doesn't unambiguosly identify the 951 * PDP context. 952 */ 953 hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size; 954 break; 955 case GTP_V1: 956 hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size; 957 break; 958 } 959 960 hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]); 961 hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]); 962 963 switch (pctx->gtp_version) { 964 case GTP_V0: 965 netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n", 966 pctx->u.v0.tid, &pctx->sgsn_addr_ip4, 967 &pctx->ms_addr_ip4, pctx); 968 break; 969 case GTP_V1: 970 netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n", 971 pctx->u.v1.i_tei, pctx->u.v1.o_tei, 972 &pctx->sgsn_addr_ip4, &pctx->ms_addr_ip4, pctx); 973 break; 974 } 975 976 return 0; 977 } 978 979 static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) 980 { 981 struct net_device *dev; 982 struct net *net; 983 984 if (!info->attrs[GTPA_VERSION] || 985 !info->attrs[GTPA_LINK] || 986 !info->attrs[GTPA_SGSN_ADDRESS] || 987 !info->attrs[GTPA_MS_ADDRESS]) 988 return -EINVAL; 989 990 switch (nla_get_u32(info->attrs[GTPA_VERSION])) { 991 case GTP_V0: 992 if (!info->attrs[GTPA_TID] || 993 !info->attrs[GTPA_FLOW]) 994 return -EINVAL; 995 break; 996 case GTP_V1: 997 if (!info->attrs[GTPA_I_TEI] || 998 !info->attrs[GTPA_O_TEI]) 999 return -EINVAL; 1000 break; 1001 1002 default: 1003 return -EINVAL; 1004 } 1005 1006 net = gtp_genl_get_net(sock_net(skb->sk), info->attrs); 1007 if (IS_ERR(net)) 1008 return PTR_ERR(net); 1009 1010 /* Check if there's an existing gtpX device to configure */ 1011 dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK])); 1012 if (dev == NULL) { 1013 put_net(net); 1014 return -ENODEV; 1015 } 1016 put_net(net); 1017 1018 return ipv4_pdp_add(dev, info); 1019 } 1020 1021 static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) 1022 { 1023 struct net_device *dev; 1024 struct pdp_ctx *pctx; 1025 struct gtp_dev *gtp; 1026 struct net *net; 1027 1028 if (!info->attrs[GTPA_VERSION] || 1029 !info->attrs[GTPA_LINK]) 1030 return -EINVAL; 1031 1032 net = gtp_genl_get_net(sock_net(skb->sk), info->attrs); 1033 if (IS_ERR(net)) 1034 return PTR_ERR(net); 1035 1036 /* Check if there's an existing gtpX device to configure */ 1037 dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK])); 1038 if (dev == NULL) { 1039 put_net(net); 1040 return -ENODEV; 1041 } 1042 put_net(net); 1043 1044 gtp = netdev_priv(dev); 1045 1046 switch (nla_get_u32(info->attrs[GTPA_VERSION])) { 1047 case GTP_V0: 1048 if (!info->attrs[GTPA_TID]) 1049 return -EINVAL; 1050 pctx = gtp0_pdp_find(gtp, nla_get_u64(info->attrs[GTPA_TID])); 1051 break; 1052 case GTP_V1: 1053 if (!info->attrs[GTPA_I_TEI]) 1054 return -EINVAL; 1055 pctx = gtp1_pdp_find(gtp, nla_get_u64(info->attrs[GTPA_I_TEI])); 1056 break; 1057 1058 default: 1059 return -EINVAL; 1060 } 1061 1062 if (pctx == NULL) 1063 return -ENOENT; 1064 1065 if (pctx->gtp_version == GTP_V0) 1066 netdev_dbg(dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n", 1067 pctx->u.v0.tid, pctx); 1068 else if (pctx->gtp_version == GTP_V1) 1069 netdev_dbg(dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n", 1070 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); 1071 1072 hlist_del_rcu(&pctx->hlist_tid); 1073 hlist_del_rcu(&pctx->hlist_addr); 1074 kfree_rcu(pctx, rcu_head); 1075 1076 return 0; 1077 } 1078 1079 static struct genl_family gtp_genl_family; 1080 1081 static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, 1082 u32 type, struct pdp_ctx *pctx) 1083 { 1084 void *genlh; 1085 1086 genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, 0, 1087 type); 1088 if (genlh == NULL) 1089 goto nlmsg_failure; 1090 1091 if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) || 1092 nla_put_be32(skb, GTPA_SGSN_ADDRESS, pctx->sgsn_addr_ip4.s_addr) || 1093 nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr)) 1094 goto nla_put_failure; 1095 1096 switch (pctx->gtp_version) { 1097 case GTP_V0: 1098 if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) || 1099 nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow)) 1100 goto nla_put_failure; 1101 break; 1102 case GTP_V1: 1103 if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) || 1104 nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei)) 1105 goto nla_put_failure; 1106 break; 1107 } 1108 genlmsg_end(skb, genlh); 1109 return 0; 1110 1111 nlmsg_failure: 1112 nla_put_failure: 1113 genlmsg_cancel(skb, genlh); 1114 return -EMSGSIZE; 1115 } 1116 1117 static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) 1118 { 1119 struct pdp_ctx *pctx = NULL; 1120 struct net_device *dev; 1121 struct sk_buff *skb2; 1122 struct gtp_dev *gtp; 1123 u32 gtp_version; 1124 struct net *net; 1125 int err; 1126 1127 if (!info->attrs[GTPA_VERSION] || 1128 !info->attrs[GTPA_LINK]) 1129 return -EINVAL; 1130 1131 gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); 1132 switch (gtp_version) { 1133 case GTP_V0: 1134 case GTP_V1: 1135 break; 1136 default: 1137 return -EINVAL; 1138 } 1139 1140 net = gtp_genl_get_net(sock_net(skb->sk), info->attrs); 1141 if (IS_ERR(net)) 1142 return PTR_ERR(net); 1143 1144 /* Check if there's an existing gtpX device to configure */ 1145 dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK])); 1146 if (dev == NULL) { 1147 put_net(net); 1148 return -ENODEV; 1149 } 1150 put_net(net); 1151 1152 gtp = netdev_priv(dev); 1153 1154 rcu_read_lock(); 1155 if (gtp_version == GTP_V0 && 1156 info->attrs[GTPA_TID]) { 1157 u64 tid = nla_get_u64(info->attrs[GTPA_TID]); 1158 1159 pctx = gtp0_pdp_find(gtp, tid); 1160 } else if (gtp_version == GTP_V1 && 1161 info->attrs[GTPA_I_TEI]) { 1162 u32 tid = nla_get_u32(info->attrs[GTPA_I_TEI]); 1163 1164 pctx = gtp1_pdp_find(gtp, tid); 1165 } else if (info->attrs[GTPA_MS_ADDRESS]) { 1166 __be32 ip = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); 1167 1168 pctx = ipv4_pdp_find(gtp, ip); 1169 } 1170 1171 if (pctx == NULL) { 1172 err = -ENOENT; 1173 goto err_unlock; 1174 } 1175 1176 skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 1177 if (skb2 == NULL) { 1178 err = -ENOMEM; 1179 goto err_unlock; 1180 } 1181 1182 err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, 1183 info->snd_seq, info->nlhdr->nlmsg_type, pctx); 1184 if (err < 0) 1185 goto err_unlock_free; 1186 1187 rcu_read_unlock(); 1188 return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid); 1189 1190 err_unlock_free: 1191 kfree_skb(skb2); 1192 err_unlock: 1193 rcu_read_unlock(); 1194 return err; 1195 } 1196 1197 static int gtp_genl_dump_pdp(struct sk_buff *skb, 1198 struct netlink_callback *cb) 1199 { 1200 struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp; 1201 struct net *net = sock_net(skb->sk); 1202 struct gtp_net *gn = net_generic(net, gtp_net_id); 1203 unsigned long tid = cb->args[1]; 1204 int i, k = cb->args[0], ret; 1205 struct pdp_ctx *pctx; 1206 1207 if (cb->args[4]) 1208 return 0; 1209 1210 list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { 1211 if (last_gtp && last_gtp != gtp) 1212 continue; 1213 else 1214 last_gtp = NULL; 1215 1216 for (i = k; i < gtp->hash_size; i++) { 1217 hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) { 1218 if (tid && tid != pctx->u.tid) 1219 continue; 1220 else 1221 tid = 0; 1222 1223 ret = gtp_genl_fill_info(skb, 1224 NETLINK_CB(cb->skb).portid, 1225 cb->nlh->nlmsg_seq, 1226 cb->nlh->nlmsg_type, pctx); 1227 if (ret < 0) { 1228 cb->args[0] = i; 1229 cb->args[1] = pctx->u.tid; 1230 cb->args[2] = (unsigned long)gtp; 1231 goto out; 1232 } 1233 } 1234 } 1235 } 1236 cb->args[4] = 1; 1237 out: 1238 return skb->len; 1239 } 1240 1241 static struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = { 1242 [GTPA_LINK] = { .type = NLA_U32, }, 1243 [GTPA_VERSION] = { .type = NLA_U32, }, 1244 [GTPA_TID] = { .type = NLA_U64, }, 1245 [GTPA_SGSN_ADDRESS] = { .type = NLA_U32, }, 1246 [GTPA_MS_ADDRESS] = { .type = NLA_U32, }, 1247 [GTPA_FLOW] = { .type = NLA_U16, }, 1248 [GTPA_NET_NS_FD] = { .type = NLA_U32, }, 1249 [GTPA_I_TEI] = { .type = NLA_U32, }, 1250 [GTPA_O_TEI] = { .type = NLA_U32, }, 1251 }; 1252 1253 static const struct genl_ops gtp_genl_ops[] = { 1254 { 1255 .cmd = GTP_CMD_NEWPDP, 1256 .doit = gtp_genl_new_pdp, 1257 .policy = gtp_genl_policy, 1258 .flags = GENL_ADMIN_PERM, 1259 }, 1260 { 1261 .cmd = GTP_CMD_DELPDP, 1262 .doit = gtp_genl_del_pdp, 1263 .policy = gtp_genl_policy, 1264 .flags = GENL_ADMIN_PERM, 1265 }, 1266 { 1267 .cmd = GTP_CMD_GETPDP, 1268 .doit = gtp_genl_get_pdp, 1269 .dumpit = gtp_genl_dump_pdp, 1270 .policy = gtp_genl_policy, 1271 .flags = GENL_ADMIN_PERM, 1272 }, 1273 }; 1274 1275 static struct genl_family gtp_genl_family __ro_after_init = { 1276 .name = "gtp", 1277 .version = 0, 1278 .hdrsize = 0, 1279 .maxattr = GTPA_MAX, 1280 .netnsok = true, 1281 .module = THIS_MODULE, 1282 .ops = gtp_genl_ops, 1283 .n_ops = ARRAY_SIZE(gtp_genl_ops), 1284 }; 1285 1286 static int __net_init gtp_net_init(struct net *net) 1287 { 1288 struct gtp_net *gn = net_generic(net, gtp_net_id); 1289 1290 INIT_LIST_HEAD(&gn->gtp_dev_list); 1291 return 0; 1292 } 1293 1294 static void __net_exit gtp_net_exit(struct net *net) 1295 { 1296 struct gtp_net *gn = net_generic(net, gtp_net_id); 1297 struct gtp_dev *gtp; 1298 LIST_HEAD(list); 1299 1300 rtnl_lock(); 1301 list_for_each_entry(gtp, &gn->gtp_dev_list, list) 1302 gtp_dellink(gtp->dev, &list); 1303 1304 unregister_netdevice_many(&list); 1305 rtnl_unlock(); 1306 } 1307 1308 static struct pernet_operations gtp_net_ops = { 1309 .init = gtp_net_init, 1310 .exit = gtp_net_exit, 1311 .id = >p_net_id, 1312 .size = sizeof(struct gtp_net), 1313 }; 1314 1315 static int __init gtp_init(void) 1316 { 1317 int err; 1318 1319 get_random_bytes(>p_h_initval, sizeof(gtp_h_initval)); 1320 1321 err = rtnl_link_register(>p_link_ops); 1322 if (err < 0) 1323 goto error_out; 1324 1325 err = genl_register_family(>p_genl_family); 1326 if (err < 0) 1327 goto unreg_rtnl_link; 1328 1329 err = register_pernet_subsys(>p_net_ops); 1330 if (err < 0) 1331 goto unreg_genl_family; 1332 1333 pr_info("GTP module loaded (pdp ctx size %Zd bytes)\n", 1334 sizeof(struct pdp_ctx)); 1335 return 0; 1336 1337 unreg_genl_family: 1338 genl_unregister_family(>p_genl_family); 1339 unreg_rtnl_link: 1340 rtnl_link_unregister(>p_link_ops); 1341 error_out: 1342 pr_err("error loading GTP module loaded\n"); 1343 return err; 1344 } 1345 late_initcall(gtp_init); 1346 1347 static void __exit gtp_fini(void) 1348 { 1349 unregister_pernet_subsys(>p_net_ops); 1350 genl_unregister_family(>p_genl_family); 1351 rtnl_link_unregister(>p_link_ops); 1352 1353 pr_info("GTP module unloaded\n"); 1354 } 1355 module_exit(gtp_fini); 1356 1357 MODULE_LICENSE("GPL"); 1358 MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>"); 1359 MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic"); 1360 MODULE_ALIAS_RTNL_LINK("gtp"); 1361 MODULE_ALIAS_GENL_FAMILY("gtp"); 1362