This source file includes following definitions.
- gtp0_hashfn
- gtp1u_hashfn
- ipv4_hashfn
- gtp0_pdp_find
- gtp1_pdp_find
- ipv4_pdp_find
- gtp_check_ms_ipv4
- gtp_check_ms
- gtp_rx
- gtp0_udp_encap_recv
- gtp1u_udp_encap_recv
- __gtp_encap_destroy
- gtp_encap_destroy
- gtp_encap_disable_sock
- gtp_encap_disable
- gtp_encap_recv
- gtp_dev_init
- gtp_dev_uninit
- ip4_route_output_gtp
- gtp0_push_header
- gtp1_push_header
- gtp_push_header
- gtp_set_pktinfo_ipv4
- gtp_build_skb_ip4
- gtp_dev_xmit
- gtp_link_setup
- gtp_destructor
- gtp_newlink
- gtp_dellink
- gtp_validate
- gtp_get_size
- gtp_fill_info
- gtp_hashtable_new
- gtp_encap_enable_socket
- gtp_encap_enable
- gtp_find_dev
- ipv4_pdp_fill
- gtp_pdp_add
- pdp_context_free
- pdp_context_delete
- gtp_genl_new_pdp
- gtp_find_pdp_by_link
- gtp_find_pdp
- gtp_genl_del_pdp
- gtp_genl_fill_info
- gtp_genl_get_pdp
- gtp_genl_dump_pdp
- gtp_net_init
- gtp_net_exit
- gtp_init
- gtp_fini
1
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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
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
64 struct gtp_dev {
65 struct list_head list;
66
67 struct sock *sk0;
68 struct sock *sk1u;
69
70 struct net_device *dev;
71
72 unsigned int role;
73 unsigned int hash_size;
74 struct hlist_head *tid_hash;
75 struct hlist_head *addr_hash;
76 };
77
78 static unsigned int gtp_net_id __read_mostly;
79
80 struct gtp_net {
81 struct list_head gtp_dev_list;
82 };
83
84 static u32 gtp_h_initval;
85
86 static void pdp_context_delete(struct pdp_ctx *pctx);
87
88 static inline u32 gtp0_hashfn(u64 tid)
89 {
90 u32 *tid32 = (u32 *) &tid;
91 return jhash_2words(tid32[0], tid32[1], gtp_h_initval);
92 }
93
94 static inline u32 gtp1u_hashfn(u32 tid)
95 {
96 return jhash_1word(tid, gtp_h_initval);
97 }
98
99 static inline u32 ipv4_hashfn(__be32 ip)
100 {
101 return jhash_1word((__force u32)ip, gtp_h_initval);
102 }
103
104
105 static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid)
106 {
107 struct hlist_head *head;
108 struct pdp_ctx *pdp;
109
110 head = >p->tid_hash[gtp0_hashfn(tid) % gtp->hash_size];
111
112 hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
113 if (pdp->gtp_version == GTP_V0 &&
114 pdp->u.v0.tid == tid)
115 return pdp;
116 }
117 return NULL;
118 }
119
120
121 static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid)
122 {
123 struct hlist_head *head;
124 struct pdp_ctx *pdp;
125
126 head = >p->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size];
127
128 hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
129 if (pdp->gtp_version == GTP_V1 &&
130 pdp->u.v1.i_tei == tid)
131 return pdp;
132 }
133 return NULL;
134 }
135
136
137 static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr)
138 {
139 struct hlist_head *head;
140 struct pdp_ctx *pdp;
141
142 head = >p->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size];
143
144 hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
145 if (pdp->af == AF_INET &&
146 pdp->ms_addr_ip4.s_addr == ms_addr)
147 return pdp;
148 }
149
150 return NULL;
151 }
152
153 static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx,
154 unsigned int hdrlen, unsigned int role)
155 {
156 struct iphdr *iph;
157
158 if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr)))
159 return false;
160
161 iph = (struct iphdr *)(skb->data + hdrlen);
162
163 if (role == GTP_ROLE_SGSN)
164 return iph->daddr == pctx->ms_addr_ip4.s_addr;
165 else
166 return iph->saddr == pctx->ms_addr_ip4.s_addr;
167 }
168
169
170
171
172 static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx,
173 unsigned int hdrlen, unsigned int role)
174 {
175 switch (ntohs(skb->protocol)) {
176 case ETH_P_IP:
177 return gtp_check_ms_ipv4(skb, pctx, hdrlen, role);
178 }
179 return false;
180 }
181
182 static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb,
183 unsigned int hdrlen, unsigned int role)
184 {
185 struct pcpu_sw_netstats *stats;
186
187 if (!gtp_check_ms(skb, pctx, hdrlen, role)) {
188 netdev_dbg(pctx->dev, "No PDP ctx for this MS\n");
189 return 1;
190 }
191
192
193 if (iptunnel_pull_header(skb, hdrlen, skb->protocol,
194 !net_eq(sock_net(pctx->sk), dev_net(pctx->dev))))
195 return -1;
196
197 netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n");
198
199
200
201
202
203 skb_reset_network_header(skb);
204
205 skb->dev = pctx->dev;
206
207 stats = this_cpu_ptr(pctx->dev->tstats);
208 u64_stats_update_begin(&stats->syncp);
209 stats->rx_packets++;
210 stats->rx_bytes += skb->len;
211 u64_stats_update_end(&stats->syncp);
212
213 netif_rx(skb);
214 return 0;
215 }
216
217
218 static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
219 {
220 unsigned int hdrlen = sizeof(struct udphdr) +
221 sizeof(struct gtp0_header);
222 struct gtp0_header *gtp0;
223 struct pdp_ctx *pctx;
224
225 if (!pskb_may_pull(skb, hdrlen))
226 return -1;
227
228 gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));
229
230 if ((gtp0->flags >> 5) != GTP_V0)
231 return 1;
232
233 if (gtp0->type != GTP_TPDU)
234 return 1;
235
236 pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
237 if (!pctx) {
238 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
239 return 1;
240 }
241
242 return gtp_rx(pctx, skb, hdrlen, gtp->role);
243 }
244
245 static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
246 {
247 unsigned int hdrlen = sizeof(struct udphdr) +
248 sizeof(struct gtp1_header);
249 struct gtp1_header *gtp1;
250 struct pdp_ctx *pctx;
251
252 if (!pskb_may_pull(skb, hdrlen))
253 return -1;
254
255 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
256
257 if ((gtp1->flags >> 5) != GTP_V1)
258 return 1;
259
260 if (gtp1->type != GTP_TPDU)
261 return 1;
262
263
264
265
266
267
268
269 if (gtp1->flags & GTP1_F_MASK)
270 hdrlen += 4;
271
272
273 if (!pskb_may_pull(skb, hdrlen))
274 return -1;
275
276 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
277
278 pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
279 if (!pctx) {
280 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
281 return 1;
282 }
283
284 return gtp_rx(pctx, skb, hdrlen, gtp->role);
285 }
286
287 static void __gtp_encap_destroy(struct sock *sk)
288 {
289 struct gtp_dev *gtp;
290
291 lock_sock(sk);
292 gtp = sk->sk_user_data;
293 if (gtp) {
294 if (gtp->sk0 == sk)
295 gtp->sk0 = NULL;
296 else
297 gtp->sk1u = NULL;
298 udp_sk(sk)->encap_type = 0;
299 rcu_assign_sk_user_data(sk, NULL);
300 sock_put(sk);
301 }
302 release_sock(sk);
303 }
304
305 static void gtp_encap_destroy(struct sock *sk)
306 {
307 rtnl_lock();
308 __gtp_encap_destroy(sk);
309 rtnl_unlock();
310 }
311
312 static void gtp_encap_disable_sock(struct sock *sk)
313 {
314 if (!sk)
315 return;
316
317 __gtp_encap_destroy(sk);
318 }
319
320 static void gtp_encap_disable(struct gtp_dev *gtp)
321 {
322 gtp_encap_disable_sock(gtp->sk0);
323 gtp_encap_disable_sock(gtp->sk1u);
324 }
325
326
327
328
329 static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb)
330 {
331 struct gtp_dev *gtp;
332 int ret = 0;
333
334 gtp = rcu_dereference_sk_user_data(sk);
335 if (!gtp)
336 return 1;
337
338 netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk);
339
340 switch (udp_sk(sk)->encap_type) {
341 case UDP_ENCAP_GTP0:
342 netdev_dbg(gtp->dev, "received GTP0 packet\n");
343 ret = gtp0_udp_encap_recv(gtp, skb);
344 break;
345 case UDP_ENCAP_GTP1U:
346 netdev_dbg(gtp->dev, "received GTP1U packet\n");
347 ret = gtp1u_udp_encap_recv(gtp, skb);
348 break;
349 default:
350 ret = -1;
351 }
352
353 switch (ret) {
354 case 1:
355 netdev_dbg(gtp->dev, "pass up to the process\n");
356 break;
357 case 0:
358 break;
359 case -1:
360 netdev_dbg(gtp->dev, "GTP packet has been dropped\n");
361 kfree_skb(skb);
362 ret = 0;
363 break;
364 }
365
366 return ret;
367 }
368
369 static int gtp_dev_init(struct net_device *dev)
370 {
371 struct gtp_dev *gtp = netdev_priv(dev);
372
373 gtp->dev = dev;
374
375 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
376 if (!dev->tstats)
377 return -ENOMEM;
378
379 return 0;
380 }
381
382 static void gtp_dev_uninit(struct net_device *dev)
383 {
384 struct gtp_dev *gtp = netdev_priv(dev);
385
386 gtp_encap_disable(gtp);
387 free_percpu(dev->tstats);
388 }
389
390 static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4,
391 const struct sock *sk,
392 __be32 daddr)
393 {
394 memset(fl4, 0, sizeof(*fl4));
395 fl4->flowi4_oif = sk->sk_bound_dev_if;
396 fl4->daddr = daddr;
397 fl4->saddr = inet_sk(sk)->inet_saddr;
398 fl4->flowi4_tos = RT_CONN_FLAGS(sk);
399 fl4->flowi4_proto = sk->sk_protocol;
400
401 return ip_route_output_key(sock_net(sk), fl4);
402 }
403
404 static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
405 {
406 int payload_len = skb->len;
407 struct gtp0_header *gtp0;
408
409 gtp0 = skb_push(skb, sizeof(*gtp0));
410
411 gtp0->flags = 0x1e;
412 gtp0->type = GTP_TPDU;
413 gtp0->length = htons(payload_len);
414 gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff);
415 gtp0->flow = htons(pctx->u.v0.flow);
416 gtp0->number = 0xff;
417 gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff;
418 gtp0->tid = cpu_to_be64(pctx->u.v0.tid);
419 }
420
421 static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
422 {
423 int payload_len = skb->len;
424 struct gtp1_header *gtp1;
425
426 gtp1 = skb_push(skb, sizeof(*gtp1));
427
428
429
430
431
432
433
434 gtp1->flags = 0x30;
435 gtp1->type = GTP_TPDU;
436 gtp1->length = htons(payload_len);
437 gtp1->tid = htonl(pctx->u.v1.o_tei);
438
439
440
441
442 }
443
444 struct gtp_pktinfo {
445 struct sock *sk;
446 struct iphdr *iph;
447 struct flowi4 fl4;
448 struct rtable *rt;
449 struct pdp_ctx *pctx;
450 struct net_device *dev;
451 __be16 gtph_port;
452 };
453
454 static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo)
455 {
456 switch (pktinfo->pctx->gtp_version) {
457 case GTP_V0:
458 pktinfo->gtph_port = htons(GTP0_PORT);
459 gtp0_push_header(skb, pktinfo->pctx);
460 break;
461 case GTP_V1:
462 pktinfo->gtph_port = htons(GTP1U_PORT);
463 gtp1_push_header(skb, pktinfo->pctx);
464 break;
465 }
466 }
467
468 static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo,
469 struct sock *sk, struct iphdr *iph,
470 struct pdp_ctx *pctx, struct rtable *rt,
471 struct flowi4 *fl4,
472 struct net_device *dev)
473 {
474 pktinfo->sk = sk;
475 pktinfo->iph = iph;
476 pktinfo->pctx = pctx;
477 pktinfo->rt = rt;
478 pktinfo->fl4 = *fl4;
479 pktinfo->dev = dev;
480 }
481
482 static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
483 struct gtp_pktinfo *pktinfo)
484 {
485 struct gtp_dev *gtp = netdev_priv(dev);
486 struct pdp_ctx *pctx;
487 struct rtable *rt;
488 struct flowi4 fl4;
489 struct iphdr *iph;
490 __be16 df;
491 int mtu;
492
493
494
495
496 iph = ip_hdr(skb);
497 if (gtp->role == GTP_ROLE_SGSN)
498 pctx = ipv4_pdp_find(gtp, iph->saddr);
499 else
500 pctx = ipv4_pdp_find(gtp, iph->daddr);
501
502 if (!pctx) {
503 netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
504 &iph->daddr);
505 return -ENOENT;
506 }
507 netdev_dbg(dev, "found PDP context %p\n", pctx);
508
509 rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr);
510 if (IS_ERR(rt)) {
511 netdev_dbg(dev, "no route to SSGN %pI4\n",
512 &pctx->peer_addr_ip4.s_addr);
513 dev->stats.tx_carrier_errors++;
514 goto err;
515 }
516
517 if (rt->dst.dev == dev) {
518 netdev_dbg(dev, "circular route to SSGN %pI4\n",
519 &pctx->peer_addr_ip4.s_addr);
520 dev->stats.collisions++;
521 goto err_rt;
522 }
523
524 skb_dst_drop(skb);
525
526
527 df = iph->frag_off;
528 if (df) {
529 mtu = dst_mtu(&rt->dst) - dev->hard_header_len -
530 sizeof(struct iphdr) - sizeof(struct udphdr);
531 switch (pctx->gtp_version) {
532 case GTP_V0:
533 mtu -= sizeof(struct gtp0_header);
534 break;
535 case GTP_V1:
536 mtu -= sizeof(struct gtp1_header);
537 break;
538 }
539 } else {
540 mtu = dst_mtu(&rt->dst);
541 }
542
543 rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu, false);
544
545 if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) &&
546 mtu < ntohs(iph->tot_len)) {
547 netdev_dbg(dev, "packet too big, fragmentation needed\n");
548 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
549 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
550 htonl(mtu));
551 goto err_rt;
552 }
553
554 gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev);
555 gtp_push_header(skb, pktinfo);
556
557 return 0;
558 err_rt:
559 ip_rt_put(rt);
560 err:
561 return -EBADMSG;
562 }
563
564 static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
565 {
566 unsigned int proto = ntohs(skb->protocol);
567 struct gtp_pktinfo pktinfo;
568 int err;
569
570
571 if (skb_cow_head(skb, dev->needed_headroom))
572 goto tx_err;
573
574 skb_reset_inner_headers(skb);
575
576
577 rcu_read_lock();
578 switch (proto) {
579 case ETH_P_IP:
580 err = gtp_build_skb_ip4(skb, dev, &pktinfo);
581 break;
582 default:
583 err = -EOPNOTSUPP;
584 break;
585 }
586 rcu_read_unlock();
587
588 if (err < 0)
589 goto tx_err;
590
591 switch (proto) {
592 case ETH_P_IP:
593 netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n",
594 &pktinfo.iph->saddr, &pktinfo.iph->daddr);
595 udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb,
596 pktinfo.fl4.saddr, pktinfo.fl4.daddr,
597 pktinfo.iph->tos,
598 ip4_dst_hoplimit(&pktinfo.rt->dst),
599 0,
600 pktinfo.gtph_port, pktinfo.gtph_port,
601 true, false);
602 break;
603 }
604
605 return NETDEV_TX_OK;
606 tx_err:
607 dev->stats.tx_errors++;
608 dev_kfree_skb(skb);
609 return NETDEV_TX_OK;
610 }
611
612 static const struct net_device_ops gtp_netdev_ops = {
613 .ndo_init = gtp_dev_init,
614 .ndo_uninit = gtp_dev_uninit,
615 .ndo_start_xmit = gtp_dev_xmit,
616 .ndo_get_stats64 = ip_tunnel_get_stats64,
617 };
618
619 static void gtp_link_setup(struct net_device *dev)
620 {
621 dev->netdev_ops = >p_netdev_ops;
622 dev->needs_free_netdev = true;
623
624 dev->hard_header_len = 0;
625 dev->addr_len = 0;
626
627
628 dev->type = ARPHRD_NONE;
629 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
630
631 dev->priv_flags |= IFF_NO_QUEUE;
632 dev->features |= NETIF_F_LLTX;
633 netif_keep_dst(dev);
634
635
636 dev->needed_headroom = LL_MAX_HEADER +
637 sizeof(struct iphdr) +
638 sizeof(struct udphdr) +
639 sizeof(struct gtp0_header);
640 }
641
642 static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize);
643 static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]);
644
645 static void gtp_destructor(struct net_device *dev)
646 {
647 struct gtp_dev *gtp = netdev_priv(dev);
648
649 kfree(gtp->addr_hash);
650 kfree(gtp->tid_hash);
651 }
652
653 static int gtp_newlink(struct net *src_net, struct net_device *dev,
654 struct nlattr *tb[], struct nlattr *data[],
655 struct netlink_ext_ack *extack)
656 {
657 struct gtp_dev *gtp;
658 struct gtp_net *gn;
659 int hashsize, err;
660
661 if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1])
662 return -EINVAL;
663
664 gtp = netdev_priv(dev);
665
666 err = gtp_encap_enable(gtp, data);
667 if (err < 0)
668 return err;
669
670 if (!data[IFLA_GTP_PDP_HASHSIZE]) {
671 hashsize = 1024;
672 } else {
673 hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]);
674 if (!hashsize)
675 hashsize = 1024;
676 }
677
678 err = gtp_hashtable_new(gtp, hashsize);
679 if (err < 0)
680 goto out_encap;
681
682 err = register_netdevice(dev);
683 if (err < 0) {
684 netdev_dbg(dev, "failed to register new netdev %d\n", err);
685 goto out_hashtable;
686 }
687
688 gn = net_generic(dev_net(dev), gtp_net_id);
689 list_add_rcu(>p->list, &gn->gtp_dev_list);
690 dev->priv_destructor = gtp_destructor;
691
692 netdev_dbg(dev, "registered new GTP interface\n");
693
694 return 0;
695
696 out_hashtable:
697 kfree(gtp->addr_hash);
698 kfree(gtp->tid_hash);
699 out_encap:
700 gtp_encap_disable(gtp);
701 return err;
702 }
703
704 static void gtp_dellink(struct net_device *dev, struct list_head *head)
705 {
706 struct gtp_dev *gtp = netdev_priv(dev);
707 struct pdp_ctx *pctx;
708 int i;
709
710 for (i = 0; i < gtp->hash_size; i++)
711 hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid)
712 pdp_context_delete(pctx);
713
714 list_del_rcu(>p->list);
715 unregister_netdevice_queue(dev, head);
716 }
717
718 static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = {
719 [IFLA_GTP_FD0] = { .type = NLA_U32 },
720 [IFLA_GTP_FD1] = { .type = NLA_U32 },
721 [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 },
722 [IFLA_GTP_ROLE] = { .type = NLA_U32 },
723 };
724
725 static int gtp_validate(struct nlattr *tb[], struct nlattr *data[],
726 struct netlink_ext_ack *extack)
727 {
728 if (!data)
729 return -EINVAL;
730
731 return 0;
732 }
733
734 static size_t gtp_get_size(const struct net_device *dev)
735 {
736 return nla_total_size(sizeof(__u32));
737 }
738
739 static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev)
740 {
741 struct gtp_dev *gtp = netdev_priv(dev);
742
743 if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size))
744 goto nla_put_failure;
745
746 return 0;
747
748 nla_put_failure:
749 return -EMSGSIZE;
750 }
751
752 static struct rtnl_link_ops gtp_link_ops __read_mostly = {
753 .kind = "gtp",
754 .maxtype = IFLA_GTP_MAX,
755 .policy = gtp_policy,
756 .priv_size = sizeof(struct gtp_dev),
757 .setup = gtp_link_setup,
758 .validate = gtp_validate,
759 .newlink = gtp_newlink,
760 .dellink = gtp_dellink,
761 .get_size = gtp_get_size,
762 .fill_info = gtp_fill_info,
763 };
764
765 static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize)
766 {
767 int i;
768
769 gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head),
770 GFP_KERNEL | __GFP_NOWARN);
771 if (gtp->addr_hash == NULL)
772 return -ENOMEM;
773
774 gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head),
775 GFP_KERNEL | __GFP_NOWARN);
776 if (gtp->tid_hash == NULL)
777 goto err1;
778
779 gtp->hash_size = hsize;
780
781 for (i = 0; i < hsize; i++) {
782 INIT_HLIST_HEAD(>p->addr_hash[i]);
783 INIT_HLIST_HEAD(>p->tid_hash[i]);
784 }
785 return 0;
786 err1:
787 kfree(gtp->addr_hash);
788 return -ENOMEM;
789 }
790
791 static struct sock *gtp_encap_enable_socket(int fd, int type,
792 struct gtp_dev *gtp)
793 {
794 struct udp_tunnel_sock_cfg tuncfg = {NULL};
795 struct socket *sock;
796 struct sock *sk;
797 int err;
798
799 pr_debug("enable gtp on %d, %d\n", fd, type);
800
801 sock = sockfd_lookup(fd, &err);
802 if (!sock) {
803 pr_debug("gtp socket fd=%d not found\n", fd);
804 return NULL;
805 }
806
807 sk = sock->sk;
808 if (sk->sk_protocol != IPPROTO_UDP ||
809 sk->sk_type != SOCK_DGRAM ||
810 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) {
811 pr_debug("socket fd=%d not UDP\n", fd);
812 sk = ERR_PTR(-EINVAL);
813 goto out_sock;
814 }
815
816 lock_sock(sk);
817 if (sk->sk_user_data) {
818 sk = ERR_PTR(-EBUSY);
819 goto out_rel_sock;
820 }
821
822 sock_hold(sk);
823
824 tuncfg.sk_user_data = gtp;
825 tuncfg.encap_type = type;
826 tuncfg.encap_rcv = gtp_encap_recv;
827 tuncfg.encap_destroy = gtp_encap_destroy;
828
829 setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg);
830
831 out_rel_sock:
832 release_sock(sock->sk);
833 out_sock:
834 sockfd_put(sock);
835 return sk;
836 }
837
838 static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[])
839 {
840 struct sock *sk1u = NULL;
841 struct sock *sk0 = NULL;
842 unsigned int role = GTP_ROLE_GGSN;
843
844 if (data[IFLA_GTP_FD0]) {
845 u32 fd0 = nla_get_u32(data[IFLA_GTP_FD0]);
846
847 sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp);
848 if (IS_ERR(sk0))
849 return PTR_ERR(sk0);
850 }
851
852 if (data[IFLA_GTP_FD1]) {
853 u32 fd1 = nla_get_u32(data[IFLA_GTP_FD1]);
854
855 sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp);
856 if (IS_ERR(sk1u)) {
857 if (sk0)
858 gtp_encap_disable_sock(sk0);
859 return PTR_ERR(sk1u);
860 }
861 }
862
863 if (data[IFLA_GTP_ROLE]) {
864 role = nla_get_u32(data[IFLA_GTP_ROLE]);
865 if (role > GTP_ROLE_SGSN) {
866 if (sk0)
867 gtp_encap_disable_sock(sk0);
868 if (sk1u)
869 gtp_encap_disable_sock(sk1u);
870 return -EINVAL;
871 }
872 }
873
874 gtp->sk0 = sk0;
875 gtp->sk1u = sk1u;
876 gtp->role = role;
877
878 return 0;
879 }
880
881 static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[])
882 {
883 struct gtp_dev *gtp = NULL;
884 struct net_device *dev;
885 struct net *net;
886
887
888
889
890 if (nla[GTPA_NET_NS_FD])
891 net = get_net_ns_by_fd(nla_get_u32(nla[GTPA_NET_NS_FD]));
892 else
893 net = get_net(src_net);
894
895 if (IS_ERR(net))
896 return NULL;
897
898
899 dev = dev_get_by_index_rcu(net, nla_get_u32(nla[GTPA_LINK]));
900 if (dev && dev->netdev_ops == >p_netdev_ops)
901 gtp = netdev_priv(dev);
902
903 put_net(net);
904 return gtp;
905 }
906
907 static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
908 {
909 pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
910 pctx->af = AF_INET;
911 pctx->peer_addr_ip4.s_addr =
912 nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]);
913 pctx->ms_addr_ip4.s_addr =
914 nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
915
916 switch (pctx->gtp_version) {
917 case GTP_V0:
918
919
920
921
922 pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]);
923 pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]);
924 break;
925 case GTP_V1:
926 pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]);
927 pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]);
928 break;
929 default:
930 break;
931 }
932 }
933
934 static int gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk,
935 struct genl_info *info)
936 {
937 struct pdp_ctx *pctx, *pctx_tid = NULL;
938 struct net_device *dev = gtp->dev;
939 u32 hash_ms, hash_tid = 0;
940 unsigned int version;
941 bool found = false;
942 __be32 ms_addr;
943
944 ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
945 hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size;
946 version = nla_get_u32(info->attrs[GTPA_VERSION]);
947
948 pctx = ipv4_pdp_find(gtp, ms_addr);
949 if (pctx)
950 found = true;
951 if (version == GTP_V0)
952 pctx_tid = gtp0_pdp_find(gtp,
953 nla_get_u64(info->attrs[GTPA_TID]));
954 else if (version == GTP_V1)
955 pctx_tid = gtp1_pdp_find(gtp,
956 nla_get_u32(info->attrs[GTPA_I_TEI]));
957 if (pctx_tid)
958 found = true;
959
960 if (found) {
961 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
962 return -EEXIST;
963 if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE)
964 return -EOPNOTSUPP;
965
966 if (pctx && pctx_tid)
967 return -EEXIST;
968 if (!pctx)
969 pctx = pctx_tid;
970
971 ipv4_pdp_fill(pctx, info);
972
973 if (pctx->gtp_version == GTP_V0)
974 netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n",
975 pctx->u.v0.tid, pctx);
976 else if (pctx->gtp_version == GTP_V1)
977 netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n",
978 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
979
980 return 0;
981
982 }
983
984 pctx = kmalloc(sizeof(*pctx), GFP_ATOMIC);
985 if (pctx == NULL)
986 return -ENOMEM;
987
988 sock_hold(sk);
989 pctx->sk = sk;
990 pctx->dev = gtp->dev;
991 ipv4_pdp_fill(pctx, info);
992 atomic_set(&pctx->tx_seq, 0);
993
994 switch (pctx->gtp_version) {
995 case GTP_V0:
996
997
998
999
1000
1001 hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size;
1002 break;
1003 case GTP_V1:
1004 hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size;
1005 break;
1006 }
1007
1008 hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]);
1009 hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]);
1010
1011 switch (pctx->gtp_version) {
1012 case GTP_V0:
1013 netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
1014 pctx->u.v0.tid, &pctx->peer_addr_ip4,
1015 &pctx->ms_addr_ip4, pctx);
1016 break;
1017 case GTP_V1:
1018 netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
1019 pctx->u.v1.i_tei, pctx->u.v1.o_tei,
1020 &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx);
1021 break;
1022 }
1023
1024 return 0;
1025 }
1026
1027 static void pdp_context_free(struct rcu_head *head)
1028 {
1029 struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head);
1030
1031 sock_put(pctx->sk);
1032 kfree(pctx);
1033 }
1034
1035 static void pdp_context_delete(struct pdp_ctx *pctx)
1036 {
1037 hlist_del_rcu(&pctx->hlist_tid);
1038 hlist_del_rcu(&pctx->hlist_addr);
1039 call_rcu(&pctx->rcu_head, pdp_context_free);
1040 }
1041
1042 static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info)
1043 {
1044 unsigned int version;
1045 struct gtp_dev *gtp;
1046 struct sock *sk;
1047 int err;
1048
1049 if (!info->attrs[GTPA_VERSION] ||
1050 !info->attrs[GTPA_LINK] ||
1051 !info->attrs[GTPA_PEER_ADDRESS] ||
1052 !info->attrs[GTPA_MS_ADDRESS])
1053 return -EINVAL;
1054
1055 version = nla_get_u32(info->attrs[GTPA_VERSION]);
1056
1057 switch (version) {
1058 case GTP_V0:
1059 if (!info->attrs[GTPA_TID] ||
1060 !info->attrs[GTPA_FLOW])
1061 return -EINVAL;
1062 break;
1063 case GTP_V1:
1064 if (!info->attrs[GTPA_I_TEI] ||
1065 !info->attrs[GTPA_O_TEI])
1066 return -EINVAL;
1067 break;
1068
1069 default:
1070 return -EINVAL;
1071 }
1072
1073 rtnl_lock();
1074 rcu_read_lock();
1075
1076 gtp = gtp_find_dev(sock_net(skb->sk), info->attrs);
1077 if (!gtp) {
1078 err = -ENODEV;
1079 goto out_unlock;
1080 }
1081
1082 if (version == GTP_V0)
1083 sk = gtp->sk0;
1084 else if (version == GTP_V1)
1085 sk = gtp->sk1u;
1086 else
1087 sk = NULL;
1088
1089 if (!sk) {
1090 err = -ENODEV;
1091 goto out_unlock;
1092 }
1093
1094 err = gtp_pdp_add(gtp, sk, info);
1095
1096 out_unlock:
1097 rcu_read_unlock();
1098 rtnl_unlock();
1099 return err;
1100 }
1101
1102 static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net,
1103 struct nlattr *nla[])
1104 {
1105 struct gtp_dev *gtp;
1106
1107 gtp = gtp_find_dev(net, nla);
1108 if (!gtp)
1109 return ERR_PTR(-ENODEV);
1110
1111 if (nla[GTPA_MS_ADDRESS]) {
1112 __be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]);
1113
1114 return ipv4_pdp_find(gtp, ip);
1115 } else if (nla[GTPA_VERSION]) {
1116 u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]);
1117
1118 if (gtp_version == GTP_V0 && nla[GTPA_TID])
1119 return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID]));
1120 else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI])
1121 return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI]));
1122 }
1123
1124 return ERR_PTR(-EINVAL);
1125 }
1126
1127 static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[])
1128 {
1129 struct pdp_ctx *pctx;
1130
1131 if (nla[GTPA_LINK])
1132 pctx = gtp_find_pdp_by_link(net, nla);
1133 else
1134 pctx = ERR_PTR(-EINVAL);
1135
1136 if (!pctx)
1137 pctx = ERR_PTR(-ENOENT);
1138
1139 return pctx;
1140 }
1141
1142 static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info)
1143 {
1144 struct pdp_ctx *pctx;
1145 int err = 0;
1146
1147 if (!info->attrs[GTPA_VERSION])
1148 return -EINVAL;
1149
1150 rcu_read_lock();
1151
1152 pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
1153 if (IS_ERR(pctx)) {
1154 err = PTR_ERR(pctx);
1155 goto out_unlock;
1156 }
1157
1158 if (pctx->gtp_version == GTP_V0)
1159 netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n",
1160 pctx->u.v0.tid, pctx);
1161 else if (pctx->gtp_version == GTP_V1)
1162 netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n",
1163 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
1164
1165 pdp_context_delete(pctx);
1166
1167 out_unlock:
1168 rcu_read_unlock();
1169 return err;
1170 }
1171
1172 static struct genl_family gtp_genl_family;
1173
1174 static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
1175 int flags, u32 type, struct pdp_ctx *pctx)
1176 {
1177 void *genlh;
1178
1179 genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, flags,
1180 type);
1181 if (genlh == NULL)
1182 goto nlmsg_failure;
1183
1184 if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) ||
1185 nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) ||
1186 nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr))
1187 goto nla_put_failure;
1188
1189 switch (pctx->gtp_version) {
1190 case GTP_V0:
1191 if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) ||
1192 nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow))
1193 goto nla_put_failure;
1194 break;
1195 case GTP_V1:
1196 if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) ||
1197 nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei))
1198 goto nla_put_failure;
1199 break;
1200 }
1201 genlmsg_end(skb, genlh);
1202 return 0;
1203
1204 nlmsg_failure:
1205 nla_put_failure:
1206 genlmsg_cancel(skb, genlh);
1207 return -EMSGSIZE;
1208 }
1209
1210 static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info)
1211 {
1212 struct pdp_ctx *pctx = NULL;
1213 struct sk_buff *skb2;
1214 int err;
1215
1216 if (!info->attrs[GTPA_VERSION])
1217 return -EINVAL;
1218
1219 rcu_read_lock();
1220
1221 pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
1222 if (IS_ERR(pctx)) {
1223 err = PTR_ERR(pctx);
1224 goto err_unlock;
1225 }
1226
1227 skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
1228 if (skb2 == NULL) {
1229 err = -ENOMEM;
1230 goto err_unlock;
1231 }
1232
1233 err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, info->snd_seq,
1234 0, info->nlhdr->nlmsg_type, pctx);
1235 if (err < 0)
1236 goto err_unlock_free;
1237
1238 rcu_read_unlock();
1239 return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid);
1240
1241 err_unlock_free:
1242 kfree_skb(skb2);
1243 err_unlock:
1244 rcu_read_unlock();
1245 return err;
1246 }
1247
1248 static int gtp_genl_dump_pdp(struct sk_buff *skb,
1249 struct netlink_callback *cb)
1250 {
1251 struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp;
1252 int i, j, bucket = cb->args[0], skip = cb->args[1];
1253 struct net *net = sock_net(skb->sk);
1254 struct pdp_ctx *pctx;
1255 struct gtp_net *gn;
1256
1257 gn = net_generic(net, gtp_net_id);
1258
1259 if (cb->args[4])
1260 return 0;
1261
1262 rcu_read_lock();
1263 list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) {
1264 if (last_gtp && last_gtp != gtp)
1265 continue;
1266 else
1267 last_gtp = NULL;
1268
1269 for (i = bucket; i < gtp->hash_size; i++) {
1270 j = 0;
1271 hlist_for_each_entry_rcu(pctx, >p->tid_hash[i],
1272 hlist_tid) {
1273 if (j >= skip &&
1274 gtp_genl_fill_info(skb,
1275 NETLINK_CB(cb->skb).portid,
1276 cb->nlh->nlmsg_seq,
1277 NLM_F_MULTI,
1278 cb->nlh->nlmsg_type, pctx)) {
1279 cb->args[0] = i;
1280 cb->args[1] = j;
1281 cb->args[2] = (unsigned long)gtp;
1282 goto out;
1283 }
1284 j++;
1285 }
1286 skip = 0;
1287 }
1288 bucket = 0;
1289 }
1290 cb->args[4] = 1;
1291 out:
1292 rcu_read_unlock();
1293 return skb->len;
1294 }
1295
1296 static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
1297 [GTPA_LINK] = { .type = NLA_U32, },
1298 [GTPA_VERSION] = { .type = NLA_U32, },
1299 [GTPA_TID] = { .type = NLA_U64, },
1300 [GTPA_PEER_ADDRESS] = { .type = NLA_U32, },
1301 [GTPA_MS_ADDRESS] = { .type = NLA_U32, },
1302 [GTPA_FLOW] = { .type = NLA_U16, },
1303 [GTPA_NET_NS_FD] = { .type = NLA_U32, },
1304 [GTPA_I_TEI] = { .type = NLA_U32, },
1305 [GTPA_O_TEI] = { .type = NLA_U32, },
1306 };
1307
1308 static const struct genl_ops gtp_genl_ops[] = {
1309 {
1310 .cmd = GTP_CMD_NEWPDP,
1311 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1312 .doit = gtp_genl_new_pdp,
1313 .flags = GENL_ADMIN_PERM,
1314 },
1315 {
1316 .cmd = GTP_CMD_DELPDP,
1317 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1318 .doit = gtp_genl_del_pdp,
1319 .flags = GENL_ADMIN_PERM,
1320 },
1321 {
1322 .cmd = GTP_CMD_GETPDP,
1323 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1324 .doit = gtp_genl_get_pdp,
1325 .dumpit = gtp_genl_dump_pdp,
1326 .flags = GENL_ADMIN_PERM,
1327 },
1328 };
1329
1330 static struct genl_family gtp_genl_family __ro_after_init = {
1331 .name = "gtp",
1332 .version = 0,
1333 .hdrsize = 0,
1334 .maxattr = GTPA_MAX,
1335 .policy = gtp_genl_policy,
1336 .netnsok = true,
1337 .module = THIS_MODULE,
1338 .ops = gtp_genl_ops,
1339 .n_ops = ARRAY_SIZE(gtp_genl_ops),
1340 };
1341
1342 static int __net_init gtp_net_init(struct net *net)
1343 {
1344 struct gtp_net *gn = net_generic(net, gtp_net_id);
1345
1346 INIT_LIST_HEAD(&gn->gtp_dev_list);
1347 return 0;
1348 }
1349
1350 static void __net_exit gtp_net_exit(struct net *net)
1351 {
1352 struct gtp_net *gn = net_generic(net, gtp_net_id);
1353 struct gtp_dev *gtp;
1354 LIST_HEAD(list);
1355
1356 rtnl_lock();
1357 list_for_each_entry(gtp, &gn->gtp_dev_list, list)
1358 gtp_dellink(gtp->dev, &list);
1359
1360 unregister_netdevice_many(&list);
1361 rtnl_unlock();
1362 }
1363
1364 static struct pernet_operations gtp_net_ops = {
1365 .init = gtp_net_init,
1366 .exit = gtp_net_exit,
1367 .id = >p_net_id,
1368 .size = sizeof(struct gtp_net),
1369 };
1370
1371 static int __init gtp_init(void)
1372 {
1373 int err;
1374
1375 get_random_bytes(>p_h_initval, sizeof(gtp_h_initval));
1376
1377 err = rtnl_link_register(>p_link_ops);
1378 if (err < 0)
1379 goto error_out;
1380
1381 err = genl_register_family(>p_genl_family);
1382 if (err < 0)
1383 goto unreg_rtnl_link;
1384
1385 err = register_pernet_subsys(>p_net_ops);
1386 if (err < 0)
1387 goto unreg_genl_family;
1388
1389 pr_info("GTP module loaded (pdp ctx size %zd bytes)\n",
1390 sizeof(struct pdp_ctx));
1391 return 0;
1392
1393 unreg_genl_family:
1394 genl_unregister_family(>p_genl_family);
1395 unreg_rtnl_link:
1396 rtnl_link_unregister(>p_link_ops);
1397 error_out:
1398 pr_err("error loading GTP module loaded\n");
1399 return err;
1400 }
1401 late_initcall(gtp_init);
1402
1403 static void __exit gtp_fini(void)
1404 {
1405 genl_unregister_family(>p_genl_family);
1406 rtnl_link_unregister(>p_link_ops);
1407 unregister_pernet_subsys(>p_net_ops);
1408
1409 pr_info("GTP module unloaded\n");
1410 }
1411 module_exit(gtp_fini);
1412
1413 MODULE_LICENSE("GPL");
1414 MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>");
1415 MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic");
1416 MODULE_ALIAS_RTNL_LINK("gtp");
1417 MODULE_ALIAS_GENL_FAMILY("gtp");