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Merge tag 'for-linus-20190706' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / net / gtp.c
blobfc45b749db4620fbd049dfe36035dc4633030bd7
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 u64 tid;
42 struct {
43 u64 tid;
44 u16 flow;
45 } v0;
46 struct {
47 u32 i_tei;
48 u32 o_tei;
49 } v1;
50 } u;
51 u8 gtp_version;
52 u16 af;
53
54 struct in_addr ms_addr_ip4;
55 struct in_addr peer_addr_ip4;
56
57 struct sock *sk;
58 struct net_device *dev;
59
60 atomic_t tx_seq;
61 struct rcu_head rcu_head;
62 };
63
64 /* One instance of the GTP device. */
65 struct gtp_dev {
66 struct list_head list;
67
68 struct sock *sk0;
69 struct sock *sk1u;
70
71 struct net_device *dev;
72
73 unsigned int role;
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 void pdp_context_delete(struct pdp_ctx *pctx);
88
89 static inline u32 gtp0_hashfn(u64 tid)
90 {
91 u32 *tid32 = (u32 *) &tid;
92 return jhash_2words(tid32[0], tid32[1], gtp_h_initval);
93 }
94
95 static inline u32 gtp1u_hashfn(u32 tid)
96 {
97 return jhash_1word(tid, gtp_h_initval);
98 }
99
100 static inline u32 ipv4_hashfn(__be32 ip)
101 {
102 return jhash_1word((__force u32)ip, gtp_h_initval);
103 }
104
105 /* Resolve a PDP context structure based on the 64bit TID. */
106 static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid)
107 {
108 struct hlist_head *head;
109 struct pdp_ctx *pdp;
110
111 head = &gtp->tid_hash[gtp0_hashfn(tid) % gtp->hash_size];
112
113 hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
114 if (pdp->gtp_version == GTP_V0 &&
115 pdp->u.v0.tid == tid)
116 return pdp;
117 }
118 return NULL;
119 }
120
121 /* Resolve a PDP context structure based on the 32bit TEI. */
122 static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid)
123 {
124 struct hlist_head *head;
125 struct pdp_ctx *pdp;
126
127 head = &gtp->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size];
128
129 hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
130 if (pdp->gtp_version == GTP_V1 &&
131 pdp->u.v1.i_tei == tid)
132 return pdp;
133 }
134 return NULL;
135 }
136
137 /* Resolve a PDP context based on IPv4 address of MS. */
138 static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr)
139 {
140 struct hlist_head *head;
141 struct pdp_ctx *pdp;
142
143 head = &gtp->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size];
144
145 hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
146 if (pdp->af == AF_INET &&
147 pdp->ms_addr_ip4.s_addr == ms_addr)
148 return pdp;
149 }
150
151 return NULL;
152 }
153
154 static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx,
155 unsigned int hdrlen, unsigned int role)
156 {
157 struct iphdr *iph;
158
159 if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr)))
160 return false;
161
162 iph = (struct iphdr *)(skb->data + hdrlen);
163
164 if (role == GTP_ROLE_SGSN)
165 return iph->daddr == pctx->ms_addr_ip4.s_addr;
166 else
167 return iph->saddr == pctx->ms_addr_ip4.s_addr;
168 }
169
170 /* Check if the inner IP address in this packet is assigned to any
171 * existing mobile subscriber.
172 */
173 static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx,
174 unsigned int hdrlen, unsigned int role)
175 {
176 switch (ntohs(skb->protocol)) {
177 case ETH_P_IP:
178 return gtp_check_ms_ipv4(skb, pctx, hdrlen, role);
179 }
180 return false;
181 }
182
183 static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb,
184 unsigned int hdrlen, unsigned int role)
185 {
186 struct pcpu_sw_netstats *stats;
187
188 if (!gtp_check_ms(skb, pctx, hdrlen, role)) {
189 netdev_dbg(pctx->dev, "No PDP ctx for this MS\n");
190 return 1;
191 }
192
193 /* Get rid of the GTP + UDP headers. */
194 if (iptunnel_pull_header(skb, hdrlen, skb->protocol,
195 !net_eq(sock_net(pctx->sk), dev_net(pctx->dev))))
196 return -1;
197
198 netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n");
199
200 /* Now that the UDP and the GTP header have been removed, set up the
201 * new network header. This is required by the upper layer to
202 * calculate the transport header.
203 */
204 skb_reset_network_header(skb);
205
206 skb->dev = pctx->dev;
207
208 stats = this_cpu_ptr(pctx->dev->tstats);
209 u64_stats_update_begin(&stats->syncp);
210 stats->rx_packets++;
211 stats->rx_bytes += skb->len;
212 u64_stats_update_end(&stats->syncp);
213
214 netif_rx(skb);
215 return 0;
216 }
217
218 /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */
219 static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
220 {
221 unsigned int hdrlen = sizeof(struct udphdr) +
222 sizeof(struct gtp0_header);
223 struct gtp0_header *gtp0;
224 struct pdp_ctx *pctx;
225
226 if (!pskb_may_pull(skb, hdrlen))
227 return -1;
228
229 gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));
230
231 if ((gtp0->flags >> 5) != GTP_V0)
232 return 1;
233
234 if (gtp0->type != GTP_TPDU)
235 return 1;
236
237 pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
238 if (!pctx) {
239 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
240 return 1;
241 }
242
243 return gtp_rx(pctx, skb, hdrlen, gtp->role);
244 }
245
246 static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
247 {
248 unsigned int hdrlen = sizeof(struct udphdr) +
249 sizeof(struct gtp1_header);
250 struct gtp1_header *gtp1;
251 struct pdp_ctx *pctx;
252
253 if (!pskb_may_pull(skb, hdrlen))
254 return -1;
255
256 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
257
258 if ((gtp1->flags >> 5) != GTP_V1)
259 return 1;
260
261 if (gtp1->type != GTP_TPDU)
262 return 1;
263
264 /* From 29.060: "This field shall be present if and only if any one or
265 * more of the S, PN and E flags are set.".
266 *
267 * If any of the bit is set, then the remaining ones also have to be
268 * set.
269 */
270 if (gtp1->flags & GTP1_F_MASK)
271 hdrlen += 4;
272
273 /* Make sure the header is larger enough, including extensions. */
274 if (!pskb_may_pull(skb, hdrlen))
275 return -1;
276
277 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
278
279 pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
280 if (!pctx) {
281 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
282 return 1;
283 }
284
285 return gtp_rx(pctx, skb, hdrlen, gtp->role);
286 }
287
288 static void gtp_encap_destroy(struct sock *sk)
289 {
290 struct gtp_dev *gtp;
291
292 gtp = rcu_dereference_sk_user_data(sk);
293 if (gtp) {
294 udp_sk(sk)->encap_type = 0;
295 rcu_assign_sk_user_data(sk, NULL);
296 sock_put(sk);
297 }
298 }
299
300 static void gtp_encap_disable_sock(struct sock *sk)
301 {
302 if (!sk)
303 return;
304
305 gtp_encap_destroy(sk);
306 }
307
308 static void gtp_encap_disable(struct gtp_dev *gtp)
309 {
310 gtp_encap_disable_sock(gtp->sk0);
311 gtp_encap_disable_sock(gtp->sk1u);
312 }
313
314 /* UDP encapsulation receive handler. See net/ipv4/udp.c.
315 * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket.
316 */
317 static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb)
318 {
319 struct gtp_dev *gtp;
320 int ret = 0;
321
322 gtp = rcu_dereference_sk_user_data(sk);
323 if (!gtp)
324 return 1;
325
326 netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk);
327
328 switch (udp_sk(sk)->encap_type) {
329 case UDP_ENCAP_GTP0:
330 netdev_dbg(gtp->dev, "received GTP0 packet\n");
331 ret = gtp0_udp_encap_recv(gtp, skb);
332 break;
333 case UDP_ENCAP_GTP1U:
334 netdev_dbg(gtp->dev, "received GTP1U packet\n");
335 ret = gtp1u_udp_encap_recv(gtp, skb);
336 break;
337 default:
338 ret = -1; /* Shouldn't happen. */
339 }
340
341 switch (ret) {
342 case 1:
343 netdev_dbg(gtp->dev, "pass up to the process\n");
344 break;
345 case 0:
346 break;
347 case -1:
348 netdev_dbg(gtp->dev, "GTP packet has been dropped\n");
349 kfree_skb(skb);
350 ret = 0;
351 break;
352 }
353
354 return ret;
355 }
356
357 static int gtp_dev_init(struct net_device *dev)
358 {
359 struct gtp_dev *gtp = netdev_priv(dev);
360
361 gtp->dev = dev;
362
363 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
364 if (!dev->tstats)
365 return -ENOMEM;
366
367 return 0;
368 }
369
370 static void gtp_dev_uninit(struct net_device *dev)
371 {
372 struct gtp_dev *gtp = netdev_priv(dev);
373
374 gtp_encap_disable(gtp);
375 free_percpu(dev->tstats);
376 }
377
378 static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4,
379 const struct sock *sk,
380 __be32 daddr)
381 {
382 memset(fl4, 0, sizeof(*fl4));
383 fl4->flowi4_oif = sk->sk_bound_dev_if;
384 fl4->daddr = daddr;
385 fl4->saddr = inet_sk(sk)->inet_saddr;
386 fl4->flowi4_tos = RT_CONN_FLAGS(sk);
387 fl4->flowi4_proto = sk->sk_protocol;
388
389 return ip_route_output_key(sock_net(sk), fl4);
390 }
391
392 static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
393 {
394 int payload_len = skb->len;
395 struct gtp0_header *gtp0;
396
397 gtp0 = skb_push(skb, sizeof(*gtp0));
398
399 gtp0->flags = 0x1e; /* v0, GTP-non-prime. */
400 gtp0->type = GTP_TPDU;
401 gtp0->length = htons(payload_len);
402 gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff);
403 gtp0->flow = htons(pctx->u.v0.flow);
404 gtp0->number = 0xff;
405 gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff;
406 gtp0->tid = cpu_to_be64(pctx->u.v0.tid);
407 }
408
409 static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
410 {
411 int payload_len = skb->len;
412 struct gtp1_header *gtp1;
413
414 gtp1 = skb_push(skb, sizeof(*gtp1));
415
416 /* Bits 8 7 6 5 4 3 2 1
417 * +--+--+--+--+--+--+--+--+
418 * |version |PT| 0| E| S|PN|
419 * +--+--+--+--+--+--+--+--+
420 * 0 0 1 1 1 0 0 0
421 */
422 gtp1->flags = 0x30; /* v1, GTP-non-prime. */
423 gtp1->type = GTP_TPDU;
424 gtp1->length = htons(payload_len);
425 gtp1->tid = htonl(pctx->u.v1.o_tei);
426
427 /* TODO: Suppport for extension header, sequence number and N-PDU.
428 * Update the length field if any of them is available.
429 */
430 }
431
432 struct gtp_pktinfo {
433 struct sock *sk;
434 struct iphdr *iph;
435 struct flowi4 fl4;
436 struct rtable *rt;
437 struct pdp_ctx *pctx;
438 struct net_device *dev;
439 __be16 gtph_port;
440 };
441
442 static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo)
443 {
444 switch (pktinfo->pctx->gtp_version) {
445 case GTP_V0:
446 pktinfo->gtph_port = htons(GTP0_PORT);
447 gtp0_push_header(skb, pktinfo->pctx);
448 break;
449 case GTP_V1:
450 pktinfo->gtph_port = htons(GTP1U_PORT);
451 gtp1_push_header(skb, pktinfo->pctx);
452 break;
453 }
454 }
455
456 static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo,
457 struct sock *sk, struct iphdr *iph,
458 struct pdp_ctx *pctx, struct rtable *rt,
459 struct flowi4 *fl4,
460 struct net_device *dev)
461 {
462 pktinfo->sk = sk;
463 pktinfo->iph = iph;
464 pktinfo->pctx = pctx;
465 pktinfo->rt = rt;
466 pktinfo->fl4 = *fl4;
467 pktinfo->dev = dev;
468 }
469
470 static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
471 struct gtp_pktinfo *pktinfo)
472 {
473 struct gtp_dev *gtp = netdev_priv(dev);
474 struct pdp_ctx *pctx;
475 struct rtable *rt;
476 struct flowi4 fl4;
477 struct iphdr *iph;
478 __be16 df;
479 int mtu;
480
481 /* Read the IP destination address and resolve the PDP context.
482 * Prepend PDP header with TEI/TID from PDP ctx.
483 */
484 iph = ip_hdr(skb);
485 if (gtp->role == GTP_ROLE_SGSN)
486 pctx = ipv4_pdp_find(gtp, iph->saddr);
487 else
488 pctx = ipv4_pdp_find(gtp, iph->daddr);
489
490 if (!pctx) {
491 netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
492 &iph->daddr);
493 return -ENOENT;
494 }
495 netdev_dbg(dev, "found PDP context %p\n", pctx);
496
497 rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr);
498 if (IS_ERR(rt)) {
499 netdev_dbg(dev, "no route to SSGN %pI4\n",
500 &pctx->peer_addr_ip4.s_addr);
501 dev->stats.tx_carrier_errors++;
502 goto err;
503 }
504
505 if (rt->dst.dev == dev) {
506 netdev_dbg(dev, "circular route to SSGN %pI4\n",
507 &pctx->peer_addr_ip4.s_addr);
508 dev->stats.collisions++;
509 goto err_rt;
510 }
511
512 skb_dst_drop(skb);
513
514 /* This is similar to tnl_update_pmtu(). */
515 df = iph->frag_off;
516 if (df) {
517 mtu = dst_mtu(&rt->dst) - dev->hard_header_len -
518 sizeof(struct iphdr) - sizeof(struct udphdr);
519 switch (pctx->gtp_version) {
520 case GTP_V0:
521 mtu -= sizeof(struct gtp0_header);
522 break;
523 case GTP_V1:
524 mtu -= sizeof(struct gtp1_header);
525 break;
526 }
527 } else {
528 mtu = dst_mtu(&rt->dst);
529 }
530
531 rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu);
532
533 if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) &&
534 mtu < ntohs(iph->tot_len)) {
535 netdev_dbg(dev, "packet too big, fragmentation needed\n");
536 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
537 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
538 htonl(mtu));
539 goto err_rt;
540 }
541
542 gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev);
543 gtp_push_header(skb, pktinfo);
544
545 return 0;
546 err_rt:
547 ip_rt_put(rt);
548 err:
549 return -EBADMSG;
550 }
551
552 static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
553 {
554 unsigned int proto = ntohs(skb->protocol);
555 struct gtp_pktinfo pktinfo;
556 int err;
557
558 /* Ensure there is sufficient headroom. */
559 if (skb_cow_head(skb, dev->needed_headroom))
560 goto tx_err;
561
562 skb_reset_inner_headers(skb);
563
564 /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */
565 rcu_read_lock();
566 switch (proto) {
567 case ETH_P_IP:
568 err = gtp_build_skb_ip4(skb, dev, &pktinfo);
569 break;
570 default:
571 err = -EOPNOTSUPP;
572 break;
573 }
574 rcu_read_unlock();
575
576 if (err < 0)
577 goto tx_err;
578
579 switch (proto) {
580 case ETH_P_IP:
581 netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n",
582 &pktinfo.iph->saddr, &pktinfo.iph->daddr);
583 udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb,
584 pktinfo.fl4.saddr, pktinfo.fl4.daddr,
585 pktinfo.iph->tos,
586 ip4_dst_hoplimit(&pktinfo.rt->dst),
587 0,
588 pktinfo.gtph_port, pktinfo.gtph_port,
589 true, false);
590 break;
591 }
592
593 return NETDEV_TX_OK;
594 tx_err:
595 dev->stats.tx_errors++;
596 dev_kfree_skb(skb);
597 return NETDEV_TX_OK;
598 }
599
600 static const struct net_device_ops gtp_netdev_ops = {
601 .ndo_init = gtp_dev_init,
602 .ndo_uninit = gtp_dev_uninit,
603 .ndo_start_xmit = gtp_dev_xmit,
604 .ndo_get_stats64 = ip_tunnel_get_stats64,
605 };
606
607 static void gtp_link_setup(struct net_device *dev)
608 {
609 dev->netdev_ops = &gtp_netdev_ops;
610 dev->needs_free_netdev = true;
611
612 dev->hard_header_len = 0;
613 dev->addr_len = 0;
614
615 /* Zero header length. */
616 dev->type = ARPHRD_NONE;
617 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
618
619 dev->priv_flags |= IFF_NO_QUEUE;
620 dev->features |= NETIF_F_LLTX;
621 netif_keep_dst(dev);
622
623 /* Assume largest header, ie. GTPv0. */
624 dev->needed_headroom = LL_MAX_HEADER +
625 sizeof(struct iphdr) +
626 sizeof(struct udphdr) +
627 sizeof(struct gtp0_header);
628 }
629
630 static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize);
631 static void gtp_hashtable_free(struct gtp_dev *gtp);
632 static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]);
633
634 static int gtp_newlink(struct net *src_net, struct net_device *dev,
635 struct nlattr *tb[], struct nlattr *data[],
636 struct netlink_ext_ack *extack)
637 {
638 struct gtp_dev *gtp;
639 struct gtp_net *gn;
640 int hashsize, err;
641
642 if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1])
643 return -EINVAL;
644
645 gtp = netdev_priv(dev);
646
647 err = gtp_encap_enable(gtp, data);
648 if (err < 0)
649 return err;
650
651 if (!data[IFLA_GTP_PDP_HASHSIZE])
652 hashsize = 1024;
653 else
654 hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]);
655
656 err = gtp_hashtable_new(gtp, hashsize);
657 if (err < 0)
658 goto out_encap;
659
660 err = register_netdevice(dev);
661 if (err < 0) {
662 netdev_dbg(dev, "failed to register new netdev %d\n", err);
663 goto out_hashtable;
664 }
665
666 gn = net_generic(dev_net(dev), gtp_net_id);
667 list_add_rcu(&gtp->list, &gn->gtp_dev_list);
668
669 netdev_dbg(dev, "registered new GTP interface\n");
670
671 return 0;
672
673 out_hashtable:
674 gtp_hashtable_free(gtp);
675 out_encap:
676 gtp_encap_disable(gtp);
677 return err;
678 }
679
680 static void gtp_dellink(struct net_device *dev, struct list_head *head)
681 {
682 struct gtp_dev *gtp = netdev_priv(dev);
683
684 gtp_encap_disable(gtp);
685 gtp_hashtable_free(gtp);
686 list_del_rcu(&gtp->list);
687 unregister_netdevice_queue(dev, head);
688 }
689
690 static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = {
691 [IFLA_GTP_FD0] = { .type = NLA_U32 },
692 [IFLA_GTP_FD1] = { .type = NLA_U32 },
693 [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 },
694 [IFLA_GTP_ROLE] = { .type = NLA_U32 },
695 };
696
697 static int gtp_validate(struct nlattr *tb[], struct nlattr *data[],
698 struct netlink_ext_ack *extack)
699 {
700 if (!data)
701 return -EINVAL;
702
703 return 0;
704 }
705
706 static size_t gtp_get_size(const struct net_device *dev)
707 {
708 return nla_total_size(sizeof(__u32)); /* IFLA_GTP_PDP_HASHSIZE */
709 }
710
711 static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev)
712 {
713 struct gtp_dev *gtp = netdev_priv(dev);
714
715 if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size))
716 goto nla_put_failure;
717
718 return 0;
719
720 nla_put_failure:
721 return -EMSGSIZE;
722 }
723
724 static struct rtnl_link_ops gtp_link_ops __read_mostly = {
725 .kind = "gtp",
726 .maxtype = IFLA_GTP_MAX,
727 .policy = gtp_policy,
728 .priv_size = sizeof(struct gtp_dev),
729 .setup = gtp_link_setup,
730 .validate = gtp_validate,
731 .newlink = gtp_newlink,
732 .dellink = gtp_dellink,
733 .get_size = gtp_get_size,
734 .fill_info = gtp_fill_info,
735 };
736
737 static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize)
738 {
739 int i;
740
741 gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head),
742 GFP_KERNEL);
743 if (gtp->addr_hash == NULL)
744 return -ENOMEM;
745
746 gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head),
747 GFP_KERNEL);
748 if (gtp->tid_hash == NULL)
749 goto err1;
750
751 gtp->hash_size = hsize;
752
753 for (i = 0; i < hsize; i++) {
754 INIT_HLIST_HEAD(&gtp->addr_hash[i]);
755 INIT_HLIST_HEAD(&gtp->tid_hash[i]);
756 }
757 return 0;
758 err1:
759 kfree(gtp->addr_hash);
760 return -ENOMEM;
761 }
762
763 static void gtp_hashtable_free(struct gtp_dev *gtp)
764 {
765 struct pdp_ctx *pctx;
766 int i;
767
768 for (i = 0; i < gtp->hash_size; i++)
769 hlist_for_each_entry_rcu(pctx, &gtp->tid_hash[i], hlist_tid)
770 pdp_context_delete(pctx);
771
772 synchronize_rcu();
773 kfree(gtp->addr_hash);
774 kfree(gtp->tid_hash);
775 }
776
777 static struct sock *gtp_encap_enable_socket(int fd, int type,
778 struct gtp_dev *gtp)
779 {
780 struct udp_tunnel_sock_cfg tuncfg = {NULL};
781 struct socket *sock;
782 struct sock *sk;
783 int err;
784
785 pr_debug("enable gtp on %d, %d\n", fd, type);
786
787 sock = sockfd_lookup(fd, &err);
788 if (!sock) {
789 pr_debug("gtp socket fd=%d not found\n", fd);
790 return NULL;
791 }
792
793 if (sock->sk->sk_protocol != IPPROTO_UDP) {
794 pr_debug("socket fd=%d not UDP\n", fd);
795 sk = ERR_PTR(-EINVAL);
796 goto out_sock;
797 }
798
799 if (rcu_dereference_sk_user_data(sock->sk)) {
800 sk = ERR_PTR(-EBUSY);
801 goto out_sock;
802 }
803
804 sk = sock->sk;
805 sock_hold(sk);
806
807 tuncfg.sk_user_data = gtp;
808 tuncfg.encap_type = type;
809 tuncfg.encap_rcv = gtp_encap_recv;
810 tuncfg.encap_destroy = gtp_encap_destroy;
811
812 setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg);
813
814 out_sock:
815 sockfd_put(sock);
816 return sk;
817 }
818
819 static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[])
820 {
821 struct sock *sk1u = NULL;
822 struct sock *sk0 = NULL;
823 unsigned int role = GTP_ROLE_GGSN;
824
825 if (data[IFLA_GTP_FD0]) {
826 u32 fd0 = nla_get_u32(data[IFLA_GTP_FD0]);
827
828 sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp);
829 if (IS_ERR(sk0))
830 return PTR_ERR(sk0);
831 }
832
833 if (data[IFLA_GTP_FD1]) {
834 u32 fd1 = nla_get_u32(data[IFLA_GTP_FD1]);
835
836 sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp);
837 if (IS_ERR(sk1u)) {
838 if (sk0)
839 gtp_encap_disable_sock(sk0);
840 return PTR_ERR(sk1u);
841 }
842 }
843
844 if (data[IFLA_GTP_ROLE]) {
845 role = nla_get_u32(data[IFLA_GTP_ROLE]);
846 if (role > GTP_ROLE_SGSN)
847 return -EINVAL;
848 }
849
850 gtp->sk0 = sk0;
851 gtp->sk1u = sk1u;
852 gtp->role = role;
853
854 return 0;
855 }
856
857 static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[])
858 {
859 struct gtp_dev *gtp = NULL;
860 struct net_device *dev;
861 struct net *net;
862
863 /* Examine the link attributes and figure out which network namespace
864 * we are talking about.
865 */
866 if (nla[GTPA_NET_NS_FD])
867 net = get_net_ns_by_fd(nla_get_u32(nla[GTPA_NET_NS_FD]));
868 else
869 net = get_net(src_net);
870
871 if (IS_ERR(net))
872 return NULL;
873
874 /* Check if there's an existing gtpX device to configure */
875 dev = dev_get_by_index_rcu(net, nla_get_u32(nla[GTPA_LINK]));
876 if (dev && dev->netdev_ops == &gtp_netdev_ops)
877 gtp = netdev_priv(dev);
878
879 put_net(net);
880 return gtp;
881 }
882
883 static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
884 {
885 pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
886 pctx->af = AF_INET;
887 pctx->peer_addr_ip4.s_addr =
888 nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]);
889 pctx->ms_addr_ip4.s_addr =
890 nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
891
892 switch (pctx->gtp_version) {
893 case GTP_V0:
894 /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow
895 * label needs to be the same for uplink and downlink packets,
896 * so let's annotate this.
897 */
898 pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]);
899 pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]);
900 break;
901 case GTP_V1:
902 pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]);
903 pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]);
904 break;
905 default:
906 break;
907 }
908 }
909
910 static int ipv4_pdp_add(struct gtp_dev *gtp, struct sock *sk,
911 struct genl_info *info)
912 {
913 struct net_device *dev = gtp->dev;
914 u32 hash_ms, hash_tid = 0;
915 struct pdp_ctx *pctx;
916 bool found = false;
917 __be32 ms_addr;
918
919 ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
920 hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size;
921
922 hlist_for_each_entry_rcu(pctx, &gtp->addr_hash[hash_ms], hlist_addr) {
923 if (pctx->ms_addr_ip4.s_addr == ms_addr) {
924 found = true;
925 break;
926 }
927 }
928
929 if (found) {
930 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
931 return -EEXIST;
932 if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE)
933 return -EOPNOTSUPP;
934
935 ipv4_pdp_fill(pctx, info);
936
937 if (pctx->gtp_version == GTP_V0)
938 netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n",
939 pctx->u.v0.tid, pctx);
940 else if (pctx->gtp_version == GTP_V1)
941 netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n",
942 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
943
944 return 0;
945
946 }
947
948 pctx = kmalloc(sizeof(struct pdp_ctx), GFP_KERNEL);
949 if (pctx == NULL)
950 return -ENOMEM;
951
952 sock_hold(sk);
953 pctx->sk = sk;
954 pctx->dev = gtp->dev;
955 ipv4_pdp_fill(pctx, info);
956 atomic_set(&pctx->tx_seq, 0);
957
958 switch (pctx->gtp_version) {
959 case GTP_V0:
960 /* TS 09.60: "The flow label identifies unambiguously a GTP
961 * flow.". We use the tid for this instead, I cannot find a
962 * situation in which this doesn't unambiguosly identify the
963 * PDP context.
964 */
965 hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size;
966 break;
967 case GTP_V1:
968 hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size;
969 break;
970 }
971
972 hlist_add_head_rcu(&pctx->hlist_addr, &gtp->addr_hash[hash_ms]);
973 hlist_add_head_rcu(&pctx->hlist_tid, &gtp->tid_hash[hash_tid]);
974
975 switch (pctx->gtp_version) {
976 case GTP_V0:
977 netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
978 pctx->u.v0.tid, &pctx->peer_addr_ip4,
979 &pctx->ms_addr_ip4, pctx);
980 break;
981 case GTP_V1:
982 netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
983 pctx->u.v1.i_tei, pctx->u.v1.o_tei,
984 &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx);
985 break;
986 }
987
988 return 0;
989 }
990
991 static void pdp_context_free(struct rcu_head *head)
992 {
993 struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head);
994
995 sock_put(pctx->sk);
996 kfree(pctx);
997 }
998
999 static void pdp_context_delete(struct pdp_ctx *pctx)
1000 {
1001 hlist_del_rcu(&pctx->hlist_tid);
1002 hlist_del_rcu(&pctx->hlist_addr);
1003 call_rcu(&pctx->rcu_head, pdp_context_free);
1004 }
1005
1006 static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info)
1007 {
1008 unsigned int version;
1009 struct gtp_dev *gtp;
1010 struct sock *sk;
1011 int err;
1012
1013 if (!info->attrs[GTPA_VERSION] ||
1014 !info->attrs[GTPA_LINK] ||
1015 !info->attrs[GTPA_PEER_ADDRESS] ||
1016 !info->attrs[GTPA_MS_ADDRESS])
1017 return -EINVAL;
1018
1019 version = nla_get_u32(info->attrs[GTPA_VERSION]);
1020
1021 switch (version) {
1022 case GTP_V0:
1023 if (!info->attrs[GTPA_TID] ||
1024 !info->attrs[GTPA_FLOW])
1025 return -EINVAL;
1026 break;
1027 case GTP_V1:
1028 if (!info->attrs[GTPA_I_TEI] ||
1029 !info->attrs[GTPA_O_TEI])
1030 return -EINVAL;
1031 break;
1032
1033 default:
1034 return -EINVAL;
1035 }
1036
1037 rcu_read_lock();
1038
1039 gtp = gtp_find_dev(sock_net(skb->sk), info->attrs);
1040 if (!gtp) {
1041 err = -ENODEV;
1042 goto out_unlock;
1043 }
1044
1045 if (version == GTP_V0)
1046 sk = gtp->sk0;
1047 else if (version == GTP_V1)
1048 sk = gtp->sk1u;
1049 else
1050 sk = NULL;
1051
1052 if (!sk) {
1053 err = -ENODEV;
1054 goto out_unlock;
1055 }
1056
1057 err = ipv4_pdp_add(gtp, sk, info);
1058
1059 out_unlock:
1060 rcu_read_unlock();
1061 return err;
1062 }
1063
1064 static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net,
1065 struct nlattr *nla[])
1066 {
1067 struct gtp_dev *gtp;
1068
1069 gtp = gtp_find_dev(net, nla);
1070 if (!gtp)
1071 return ERR_PTR(-ENODEV);
1072
1073 if (nla[GTPA_MS_ADDRESS]) {
1074 __be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]);
1075
1076 return ipv4_pdp_find(gtp, ip);
1077 } else if (nla[GTPA_VERSION]) {
1078 u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]);
1079
1080 if (gtp_version == GTP_V0 && nla[GTPA_TID])
1081 return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID]));
1082 else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI])
1083 return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI]));
1084 }
1085
1086 return ERR_PTR(-EINVAL);
1087 }
1088
1089 static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[])
1090 {
1091 struct pdp_ctx *pctx;
1092
1093 if (nla[GTPA_LINK])
1094 pctx = gtp_find_pdp_by_link(net, nla);
1095 else
1096 pctx = ERR_PTR(-EINVAL);
1097
1098 if (!pctx)
1099 pctx = ERR_PTR(-ENOENT);
1100
1101 return pctx;
1102 }
1103
1104 static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info)
1105 {
1106 struct pdp_ctx *pctx;
1107 int err = 0;
1108
1109 if (!info->attrs[GTPA_VERSION])
1110 return -EINVAL;
1111
1112 rcu_read_lock();
1113
1114 pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
1115 if (IS_ERR(pctx)) {
1116 err = PTR_ERR(pctx);
1117 goto out_unlock;
1118 }
1119
1120 if (pctx->gtp_version == GTP_V0)
1121 netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n",
1122 pctx->u.v0.tid, pctx);
1123 else if (pctx->gtp_version == GTP_V1)
1124 netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n",
1125 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
1126
1127 pdp_context_delete(pctx);
1128
1129 out_unlock:
1130 rcu_read_unlock();
1131 return err;
1132 }
1133
1134 static struct genl_family gtp_genl_family;
1135
1136 static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
1137 u32 type, struct pdp_ctx *pctx)
1138 {
1139 void *genlh;
1140
1141 genlh = genlmsg_put(skb, snd_portid, snd_seq, &gtp_genl_family, 0,
1142 type);
1143 if (genlh == NULL)
1144 goto nlmsg_failure;
1145
1146 if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) ||
1147 nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) ||
1148 nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr))
1149 goto nla_put_failure;
1150
1151 switch (pctx->gtp_version) {
1152 case GTP_V0:
1153 if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) ||
1154 nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow))
1155 goto nla_put_failure;
1156 break;
1157 case GTP_V1:
1158 if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) ||
1159 nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei))
1160 goto nla_put_failure;
1161 break;
1162 }
1163 genlmsg_end(skb, genlh);
1164 return 0;
1165
1166 nlmsg_failure:
1167 nla_put_failure:
1168 genlmsg_cancel(skb, genlh);
1169 return -EMSGSIZE;
1170 }
1171
1172 static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info)
1173 {
1174 struct pdp_ctx *pctx = NULL;
1175 struct sk_buff *skb2;
1176 int err;
1177
1178 if (!info->attrs[GTPA_VERSION])
1179 return -EINVAL;
1180
1181 rcu_read_lock();
1182
1183 pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
1184 if (IS_ERR(pctx)) {
1185 err = PTR_ERR(pctx);
1186 goto err_unlock;
1187 }
1188
1189 skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
1190 if (skb2 == NULL) {
1191 err = -ENOMEM;
1192 goto err_unlock;
1193 }
1194
1195 err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid,
1196 info->snd_seq, info->nlhdr->nlmsg_type, pctx);
1197 if (err < 0)
1198 goto err_unlock_free;
1199
1200 rcu_read_unlock();
1201 return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid);
1202
1203 err_unlock_free:
1204 kfree_skb(skb2);
1205 err_unlock:
1206 rcu_read_unlock();
1207 return err;
1208 }
1209
1210 static int gtp_genl_dump_pdp(struct sk_buff *skb,
1211 struct netlink_callback *cb)
1212 {
1213 struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp;
1214 struct net *net = sock_net(skb->sk);
1215 struct gtp_net *gn = net_generic(net, gtp_net_id);
1216 unsigned long tid = cb->args[1];
1217 int i, k = cb->args[0], ret;
1218 struct pdp_ctx *pctx;
1219
1220 if (cb->args[4])
1221 return 0;
1222
1223 list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) {
1224 if (last_gtp && last_gtp != gtp)
1225 continue;
1226 else
1227 last_gtp = NULL;
1228
1229 for (i = k; i < gtp->hash_size; i++) {
1230 hlist_for_each_entry_rcu(pctx, &gtp->tid_hash[i], hlist_tid) {
1231 if (tid && tid != pctx->u.tid)
1232 continue;
1233 else
1234 tid = 0;
1235
1236 ret = gtp_genl_fill_info(skb,
1237 NETLINK_CB(cb->skb).portid,
1238 cb->nlh->nlmsg_seq,
1239 cb->nlh->nlmsg_type, pctx);
1240 if (ret < 0) {
1241 cb->args[0] = i;
1242 cb->args[1] = pctx->u.tid;
1243 cb->args[2] = (unsigned long)gtp;
1244 goto out;
1245 }
1246 }
1247 }
1248 }
1249 cb->args[4] = 1;
1250 out:
1251 return skb->len;
1252 }
1253
1254 static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
1255 [GTPA_LINK] = { .type = NLA_U32, },
1256 [GTPA_VERSION] = { .type = NLA_U32, },
1257 [GTPA_TID] = { .type = NLA_U64, },
1258 [GTPA_PEER_ADDRESS] = { .type = NLA_U32, },
1259 [GTPA_MS_ADDRESS] = { .type = NLA_U32, },
1260 [GTPA_FLOW] = { .type = NLA_U16, },
1261 [GTPA_NET_NS_FD] = { .type = NLA_U32, },
1262 [GTPA_I_TEI] = { .type = NLA_U32, },
1263 [GTPA_O_TEI] = { .type = NLA_U32, },
1264 };
1265
1266 static const struct genl_ops gtp_genl_ops[] = {
1267 {
1268 .cmd = GTP_CMD_NEWPDP,
1269 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1270 .doit = gtp_genl_new_pdp,
1271 .flags = GENL_ADMIN_PERM,
1272 },
1273 {
1274 .cmd = GTP_CMD_DELPDP,
1275 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1276 .doit = gtp_genl_del_pdp,
1277 .flags = GENL_ADMIN_PERM,
1278 },
1279 {
1280 .cmd = GTP_CMD_GETPDP,
1281 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1282 .doit = gtp_genl_get_pdp,
1283 .dumpit = gtp_genl_dump_pdp,
1284 .flags = GENL_ADMIN_PERM,
1285 },
1286 };
1287
1288 static struct genl_family gtp_genl_family __ro_after_init = {
1289 .name = "gtp",
1290 .version = 0,
1291 .hdrsize = 0,
1292 .maxattr = GTPA_MAX,
1293 .policy = gtp_genl_policy,
1294 .netnsok = true,
1295 .module = THIS_MODULE,
1296 .ops = gtp_genl_ops,
1297 .n_ops = ARRAY_SIZE(gtp_genl_ops),
1298 };
1299
1300 static int __net_init gtp_net_init(struct net *net)
1301 {
1302 struct gtp_net *gn = net_generic(net, gtp_net_id);
1303
1304 INIT_LIST_HEAD(&gn->gtp_dev_list);
1305 return 0;
1306 }
1307
1308 static void __net_exit gtp_net_exit(struct net *net)
1309 {
1310 struct gtp_net *gn = net_generic(net, gtp_net_id);
1311 struct gtp_dev *gtp;
1312 LIST_HEAD(list);
1313
1314 rtnl_lock();
1315 list_for_each_entry(gtp, &gn->gtp_dev_list, list)
1316 gtp_dellink(gtp->dev, &list);
1317
1318 unregister_netdevice_many(&list);
1319 rtnl_unlock();
1320 }
1321
1322 static struct pernet_operations gtp_net_ops = {
1323 .init = gtp_net_init,
1324 .exit = gtp_net_exit,
1325 .id = &gtp_net_id,
1326 .size = sizeof(struct gtp_net),
1327 };
1328
1329 static int __init gtp_init(void)
1330 {
1331 int err;
1332
1333 get_random_bytes(&gtp_h_initval, sizeof(gtp_h_initval));
1334
1335 err = rtnl_link_register(&gtp_link_ops);
1336 if (err < 0)
1337 goto error_out;
1338
1339 err = genl_register_family(&gtp_genl_family);
1340 if (err < 0)
1341 goto unreg_rtnl_link;
1342
1343 err = register_pernet_subsys(&gtp_net_ops);
1344 if (err < 0)
1345 goto unreg_genl_family;
1346
1347 pr_info("GTP module loaded (pdp ctx size %zd bytes)\n",
1348 sizeof(struct pdp_ctx));
1349 return 0;
1350
1351 unreg_genl_family:
1352 genl_unregister_family(&gtp_genl_family);
1353 unreg_rtnl_link:
1354 rtnl_link_unregister(&gtp_link_ops);
1355 error_out:
1356 pr_err("error loading GTP module loaded\n");
1357 return err;
1358 }
1359 late_initcall(gtp_init);
1360
1361 static void __exit gtp_fini(void)
1362 {
1363 unregister_pernet_subsys(&gtp_net_ops);
1364 genl_unregister_family(&gtp_genl_family);
1365 rtnl_link_unregister(&gtp_link_ops);
1366
1367 pr_info("GTP module unloaded\n");
1368 }
1369 module_exit(gtp_fini);
1370
1371 MODULE_LICENSE("GPL");
1372 MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>");
1373 MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic");
1374 MODULE_ALIAS_RTNL_LINK("gtp");
1375 MODULE_ALIAS_GENL_FAMILY("gtp");
Linux with added FPC-III support