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Merge branch 'bind_unbind' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / net / gtp.c
CommitLineData
459aa660
PN		 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>
459aa660
PN		 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. */
40struct 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;
ae6336b5 59 struct in_addr peer_addr_ip4;
459aa660 60
101cfbc1 61 struct sock *sk;
5b171f9c
AS		 62 struct net_device *dev;
63
459aa660
PN		 64 atomic_t tx_seq;
65 struct rcu_head rcu_head;
66};
67
68/* One instance of the GTP device. */
69struct gtp_dev {
70 struct list_head list;
71
17886c47
AS		 72 struct sock *sk0;
73 struct sock *sk1u;
459aa660 74
459aa660
PN		 75 struct net_device *dev;
76
91ed81f9 77 unsigned int role;
459aa660
PN		 78 unsigned int hash_size;
79 struct hlist_head *tid_hash;
80 struct hlist_head *addr_hash;
81};
82
c7d03a00 83static unsigned int gtp_net_id __read_mostly;
459aa660
PN		 84
85struct gtp_net {
86 struct list_head gtp_dev_list;
87};
88
89static u32 gtp_h_initval;
90
6b5e2e74
AS		 91static void pdp_context_delete(struct pdp_ctx *pctx);
92
459aa660
PN		 93static inline u32 gtp0_hashfn(u64 tid)
94{
95 u32 *tid32 = (u32 *) &tid;
96 return jhash_2words(tid32[0], tid32[1], gtp_h_initval);
97}
98
99static inline u32 gtp1u_hashfn(u32 tid)
100{
101 return jhash_1word(tid, gtp_h_initval);
102}
103
104static inline u32 ipv4_hashfn(__be32 ip)
105{
106 return jhash_1word((__force u32)ip, gtp_h_initval);
107}
108
109/* Resolve a PDP context structure based on the 64bit TID. */
110static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid)
111{
112 struct hlist_head *head;
113 struct pdp_ctx *pdp;
114
115 head = &gtp->tid_hash[gtp0_hashfn(tid) % gtp->hash_size];
116
117 hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
118 if (pdp->gtp_version == GTP_V0 &&
119 pdp->u.v0.tid == tid)
120 return pdp;
121 }
122 return NULL;
123}
124
125/* Resolve a PDP context structure based on the 32bit TEI. */
126static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid)
127{
128 struct hlist_head *head;
129 struct pdp_ctx *pdp;
130
131 head = &gtp->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size];
132
133 hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
134 if (pdp->gtp_version == GTP_V1 &&
135 pdp->u.v1.i_tei == tid)
136 return pdp;
137 }
138 return NULL;
139}
140
141/* Resolve a PDP context based on IPv4 address of MS. */
142static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr)
143{
144 struct hlist_head *head;
145 struct pdp_ctx *pdp;
146
147 head = &gtp->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size];
148
149 hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
150 if (pdp->af == AF_INET &&
151 pdp->ms_addr_ip4.s_addr == ms_addr)
152 return pdp;
153 }
154
155 return NULL;
156}
157
91ed81f9
JB		 158static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx,
159 unsigned int hdrlen, unsigned int role)
459aa660
PN		 160{
161 struct iphdr *iph;
162
163 if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr)))
164 return false;
165
88edf103 166 iph = (struct iphdr *)(skb->data + hdrlen);
459aa660 167
91ed81f9
JB		 168 if (role == GTP_ROLE_SGSN)
169 return iph->daddr == pctx->ms_addr_ip4.s_addr;
170 else
171 return iph->saddr == pctx->ms_addr_ip4.s_addr;
459aa660
PN		 172}
173
91ed81f9 174/* Check if the inner IP address in this packet is assigned to any
459aa660
PN		 175 * existing mobile subscriber.
176 */
91ed81f9
JB		 177static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx,
178 unsigned int hdrlen, unsigned int role)
459aa660
PN		 179{
180 switch (ntohs(skb->protocol)) {
181 case ETH_P_IP:
91ed81f9 182 return gtp_check_ms_ipv4(skb, pctx, hdrlen, role);
459aa660
PN		 183 }
184 return false;
185}
186
91ed81f9
JB		 187static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb,
188 unsigned int hdrlen, unsigned int role)
5b171f9c
AS		 189{
190 struct pcpu_sw_netstats *stats;
191
91ed81f9 192 if (!gtp_check_ms(skb, pctx, hdrlen, role)) {
5b171f9c
AS		 193 netdev_dbg(pctx->dev, "No PDP ctx for this MS\n");
194 return 1;
195 }
196
197 /* Get rid of the GTP + UDP headers. */
101cfbc1
AS		 198 if (iptunnel_pull_header(skb, hdrlen, skb->protocol,
199 !net_eq(sock_net(pctx->sk), dev_net(pctx->dev))))
5b171f9c
AS		 200 return -1;
201
202 netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n");
203
204 /* Now that the UDP and the GTP header have been removed, set up the
205 * new network header. This is required by the upper layer to
206 * calculate the transport header.
207 */
208 skb_reset_network_header(skb);
209
210 skb->dev = pctx->dev;
211
212 stats = this_cpu_ptr(pctx->dev->tstats);
213 u64_stats_update_begin(&stats->syncp);
214 stats->rx_packets++;
215 stats->rx_bytes += skb->len;
216 u64_stats_update_end(&stats->syncp);
217
218 netif_rx(skb);
219 return 0;
220}
221
459aa660 222/* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */
101cfbc1 223static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
459aa660
PN		 224{
225 unsigned int hdrlen = sizeof(struct udphdr) +
226 sizeof(struct gtp0_header);
227 struct gtp0_header *gtp0;
228 struct pdp_ctx *pctx;
459aa660
PN		 229
230 if (!pskb_may_pull(skb, hdrlen))
231 return -1;
232
233 gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));
234
235 if ((gtp0->flags >> 5) != GTP_V0)
236 return 1;
237
238 if (gtp0->type != GTP_TPDU)
239 return 1;
240
459aa660
PN		 241 pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
242 if (!pctx) {
243 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
1796a81d 244 return 1;
459aa660
PN		 245 }
246
91ed81f9 247 return gtp_rx(pctx, skb, hdrlen, gtp->role);
459aa660
PN		 248}
249
101cfbc1 250static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
459aa660
PN		 251{
252 unsigned int hdrlen = sizeof(struct udphdr) +
253 sizeof(struct gtp1_header);
254 struct gtp1_header *gtp1;
255 struct pdp_ctx *pctx;
459aa660
PN		 256
257 if (!pskb_may_pull(skb, hdrlen))
258 return -1;
259
260 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
261
262 if ((gtp1->flags >> 5) != GTP_V1)
263 return 1;
264
265 if (gtp1->type != GTP_TPDU)
266 return 1;
267
268 /* From 29.060: "This field shall be present if and only if any one or
269 * more of the S, PN and E flags are set.".
270 *
271 * If any of the bit is set, then the remaining ones also have to be
272 * set.
273 */
274 if (gtp1->flags & GTP1_F_MASK)
275 hdrlen += 4;
276
277 /* Make sure the header is larger enough, including extensions. */
278 if (!pskb_may_pull(skb, hdrlen))
279 return -1;
280
93edb8c7
PN		 281 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
282
459aa660
PN		 283 pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
284 if (!pctx) {
285 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
1796a81d 286 return 1;
459aa660
PN		 287 }
288
91ed81f9 289 return gtp_rx(pctx, skb, hdrlen, gtp->role);
459aa660
PN		 290}
291
1e3a3abd 292static void gtp_encap_destroy(struct sock *sk)
459aa660 293{
1e3a3abd 294 struct gtp_dev *gtp;
459aa660 295
1e3a3abd
AS		 296 gtp = rcu_dereference_sk_user_data(sk);
297 if (gtp) {
298 udp_sk(sk)->encap_type = 0;
299 rcu_assign_sk_user_data(sk, NULL);
300 sock_put(sk);
301 }
459aa660
PN		 302}
303
1e3a3abd 304static void gtp_encap_disable_sock(struct sock *sk)
459aa660 305{
1e3a3abd
AS		 306 if (!sk)
307 return;
459aa660 308
1e3a3abd
AS		 309 gtp_encap_destroy(sk);
310}
311
312static void gtp_encap_disable(struct gtp_dev *gtp)
313{
314 gtp_encap_disable_sock(gtp->sk0);
315 gtp_encap_disable_sock(gtp->sk1u);
459aa660
PN		 316}
317
318/* UDP encapsulation receive handler. See net/ipv4/udp.c.
319 * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket.
320 */
321static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb)
322{
459aa660 323 struct gtp_dev *gtp;
5b171f9c 324 int ret = 0;
459aa660
PN		 325
326 gtp = rcu_dereference_sk_user_data(sk);
327 if (!gtp)
328 return 1;
329
330 netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk);
331
459aa660
PN		 332 switch (udp_sk(sk)->encap_type) {
333 case UDP_ENCAP_GTP0:
334 netdev_dbg(gtp->dev, "received GTP0 packet\n");
101cfbc1 335 ret = gtp0_udp_encap_recv(gtp, skb);
459aa660
PN		 336 break;
337 case UDP_ENCAP_GTP1U:
338 netdev_dbg(gtp->dev, "received GTP1U packet\n");
101cfbc1 339 ret = gtp1u_udp_encap_recv(gtp, skb);
459aa660
PN		 340 break;
341 default:
342 ret = -1; /* Shouldn't happen. */
343 }
344
345 switch (ret) {
346 case 1:
347 netdev_dbg(gtp->dev, "pass up to the process\n");
5b171f9c 348 break;
459aa660 349 case 0:
459aa660
PN		 350 break;
351 case -1:
352 netdev_dbg(gtp->dev, "GTP packet has been dropped\n");
353 kfree_skb(skb);
5b171f9c
AS		 354 ret = 0;
355 break;
459aa660
PN		 356 }
357
5b171f9c 358 return ret;
459aa660
PN		 359}
360
361static int gtp_dev_init(struct net_device *dev)
362{
363 struct gtp_dev *gtp = netdev_priv(dev);
364
365 gtp->dev = dev;
366
367 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
368 if (!dev->tstats)
369 return -ENOMEM;
370
371 return 0;
372}
373
374static void gtp_dev_uninit(struct net_device *dev)
375{
376 struct gtp_dev *gtp = netdev_priv(dev);
377
378 gtp_encap_disable(gtp);
379 free_percpu(dev->tstats);
380}
381
101cfbc1
AS		 382static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4,
383 const struct sock *sk,
384 __be32 daddr)
459aa660
PN		 385{
386 memset(fl4, 0, sizeof(*fl4));
387 fl4->flowi4_oif = sk->sk_bound_dev_if;
388 fl4->daddr = daddr;
389 fl4->saddr = inet_sk(sk)->inet_saddr;
390 fl4->flowi4_tos = RT_CONN_FLAGS(sk);
391 fl4->flowi4_proto = sk->sk_protocol;
392
101cfbc1 393 return ip_route_output_key(sock_net(sk), fl4);
459aa660
PN		 394}
395
396static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
397{
398 int payload_len = skb->len;
399 struct gtp0_header *gtp0;
400
401 gtp0 = (struct gtp0_header *) skb_push(skb, sizeof(*gtp0));
402
403 gtp0->flags = 0x1e; /* v0, GTP-non-prime. */
404 gtp0->type = GTP_TPDU;
405 gtp0->length = htons(payload_len);
406 gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff);
407 gtp0->flow = htons(pctx->u.v0.flow);
408 gtp0->number = 0xff;
409 gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff;
410 gtp0->tid = cpu_to_be64(pctx->u.v0.tid);
411}
412
413static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
414{
415 int payload_len = skb->len;
416 struct gtp1_header *gtp1;
417
418 gtp1 = (struct gtp1_header *) skb_push(skb, sizeof(*gtp1));
419
420 /* Bits 8 7 6 5 4 3 2 1
421 * +--+--+--+--+--+--+--+--+
d928be81 422 * |version |PT| 0| E| S|PN|
459aa660
PN		 423 * +--+--+--+--+--+--+--+--+
424 * 0 0 1 1 1 0 0 0
425 */
d928be81 426 gtp1->flags = 0x30; /* v1, GTP-non-prime. */
459aa660
PN		 427 gtp1->type = GTP_TPDU;
428 gtp1->length = htons(payload_len);
429 gtp1->tid = htonl(pctx->u.v1.o_tei);
430
431 /* TODO: Suppport for extension header, sequence number and N-PDU.
432 * Update the length field if any of them is available.
433 */
434}
435
436struct gtp_pktinfo {
437 struct sock *sk;
438 struct iphdr *iph;
439 struct flowi4 fl4;
440 struct rtable *rt;
441 struct pdp_ctx *pctx;
442 struct net_device *dev;
443 __be16 gtph_port;
444};
445
446static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo)
447{
448 switch (pktinfo->pctx->gtp_version) {
449 case GTP_V0:
450 pktinfo->gtph_port = htons(GTP0_PORT);
451 gtp0_push_header(skb, pktinfo->pctx);
452 break;
453 case GTP_V1:
454 pktinfo->gtph_port = htons(GTP1U_PORT);
455 gtp1_push_header(skb, pktinfo->pctx);
456 break;
457 }
458}
459
460static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo,
461 struct sock *sk, struct iphdr *iph,
462 struct pdp_ctx *pctx, struct rtable *rt,
463 struct flowi4 *fl4,
464 struct net_device *dev)
465{
466 pktinfo->sk = sk;
467 pktinfo->iph = iph;
468 pktinfo->pctx = pctx;
469 pktinfo->rt = rt;
470 pktinfo->fl4 = *fl4;
471 pktinfo->dev = dev;
472}
473
474static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
475 struct gtp_pktinfo *pktinfo)
476{
477 struct gtp_dev *gtp = netdev_priv(dev);
478 struct pdp_ctx *pctx;
479 struct rtable *rt;
480 struct flowi4 fl4;
481 struct iphdr *iph;
459aa660
PN		 482 __be16 df;
483 int mtu;
484
485 /* Read the IP destination address and resolve the PDP context.
486 * Prepend PDP header with TEI/TID from PDP ctx.
487 */
488 iph = ip_hdr(skb);
91ed81f9
JB		 489 if (gtp->role == GTP_ROLE_SGSN)
490 pctx = ipv4_pdp_find(gtp, iph->saddr);
491 else
492 pctx = ipv4_pdp_find(gtp, iph->daddr);
493
459aa660
PN		 494 if (!pctx) {
495 netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
496 &iph->daddr);
497 return -ENOENT;
498 }
499 netdev_dbg(dev, "found PDP context %p\n", pctx);
500
ae6336b5 501 rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr);
459aa660
PN		 502 if (IS_ERR(rt)) {
503 netdev_dbg(dev, "no route to SSGN %pI4\n",
ae6336b5 504 &pctx->peer_addr_ip4.s_addr);
459aa660
PN		 505 dev->stats.tx_carrier_errors++;
506 goto err;
507 }
508
509 if (rt->dst.dev == dev) {
510 netdev_dbg(dev, "circular route to SSGN %pI4\n",
ae6336b5 511 &pctx->peer_addr_ip4.s_addr);
459aa660
PN		 512 dev->stats.collisions++;
513 goto err_rt;
514 }
515
516 skb_dst_drop(skb);
517
518 /* This is similar to tnl_update_pmtu(). */
519 df = iph->frag_off;
520 if (df) {
521 mtu = dst_mtu(&rt->dst) - dev->hard_header_len -
522 sizeof(struct iphdr) - sizeof(struct udphdr);
523 switch (pctx->gtp_version) {
524 case GTP_V0:
525 mtu -= sizeof(struct gtp0_header);
526 break;
527 case GTP_V1:
528 mtu -= sizeof(struct gtp1_header);
529 break;
530 }
531 } else {
532 mtu = dst_mtu(&rt->dst);
533 }
534
535 rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu);
536
537 if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) &&
538 mtu < ntohs(iph->tot_len)) {
539 netdev_dbg(dev, "packet too big, fragmentation needed\n");
540 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
541 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
542 htonl(mtu));
543 goto err_rt;
544 }
545
101cfbc1 546 gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev);
459aa660
PN		 547 gtp_push_header(skb, pktinfo);
548
549 return 0;
550err_rt:
551 ip_rt_put(rt);
552err:
553 return -EBADMSG;
554}
555
556static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
557{
558 unsigned int proto = ntohs(skb->protocol);
559 struct gtp_pktinfo pktinfo;
560 int err;
561
562 /* Ensure there is sufficient headroom. */
563 if (skb_cow_head(skb, dev->needed_headroom))
564 goto tx_err;
565
566 skb_reset_inner_headers(skb);
567
568 /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */
569 rcu_read_lock();
570 switch (proto) {
571 case ETH_P_IP:
572 err = gtp_build_skb_ip4(skb, dev, &pktinfo);
573 break;
574 default:
575 err = -EOPNOTSUPP;
576 break;
577 }
578 rcu_read_unlock();
579
580 if (err < 0)
581 goto tx_err;
582
583 switch (proto) {
584 case ETH_P_IP:
585 netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n",
586 &pktinfo.iph->saddr, &pktinfo.iph->daddr);
587 udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb,
588 pktinfo.fl4.saddr, pktinfo.fl4.daddr,
589 pktinfo.iph->tos,
590 ip4_dst_hoplimit(&pktinfo.rt->dst),
c6ce1d08 591 0,
459aa660
PN		 592 pktinfo.gtph_port, pktinfo.gtph_port,
593 true, false);
594 break;
595 }
596
597 return NETDEV_TX_OK;
598tx_err:
599 dev->stats.tx_errors++;
600 dev_kfree_skb(skb);
601 return NETDEV_TX_OK;
602}
603
604static const struct net_device_ops gtp_netdev_ops = {
605 .ndo_init = gtp_dev_init,
606 .ndo_uninit = gtp_dev_uninit,
607 .ndo_start_xmit = gtp_dev_xmit,
608 .ndo_get_stats64 = ip_tunnel_get_stats64,
609};
610
611static void gtp_link_setup(struct net_device *dev)
612{
613 dev->netdev_ops = &gtp_netdev_ops;
cf124db5 614 dev->needs_free_netdev = true;
459aa660
PN		 615
616 dev->hard_header_len = 0;
617 dev->addr_len = 0;
618
619 /* Zero header length. */
620 dev->type = ARPHRD_NONE;
621 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
622
623 dev->priv_flags |= IFF_NO_QUEUE;
624 dev->features |= NETIF_F_LLTX;
625 netif_keep_dst(dev);
626
627 /* Assume largest header, ie. GTPv0. */
628 dev->needed_headroom = LL_MAX_HEADER +
629 sizeof(struct iphdr) +
630 sizeof(struct udphdr) +
631 sizeof(struct gtp0_header);
632}
633
634static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize);
635static void gtp_hashtable_free(struct gtp_dev *gtp);
1e3a3abd 636static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]);
459aa660
PN		 637
638static int gtp_newlink(struct net *src_net, struct net_device *dev,
639 struct nlattr *tb[], struct nlattr *data[])
640{
459aa660
PN		 641 struct gtp_dev *gtp;
642 struct gtp_net *gn;
1e3a3abd 643 int hashsize, err;
459aa660 644
1e3a3abd 645 if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1])
459aa660
PN		 646 return -EINVAL;
647
648 gtp = netdev_priv(dev);
649
1e3a3abd 650 err = gtp_encap_enable(gtp, data);
459aa660 651 if (err < 0)
1e3a3abd 652 return err;
459aa660
PN		 653
654 if (!data[IFLA_GTP_PDP_HASHSIZE])
655 hashsize = 1024;
656 else
657 hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]);
658
659 err = gtp_hashtable_new(gtp, hashsize);
660 if (err < 0)
661 goto out_encap;
662
663 err = register_netdevice(dev);
664 if (err < 0) {
665 netdev_dbg(dev, "failed to register new netdev %d\n", err);
666 goto out_hashtable;
667 }
668
669 gn = net_generic(dev_net(dev), gtp_net_id);
670 list_add_rcu(&gtp->list, &gn->gtp_dev_list);
671
672 netdev_dbg(dev, "registered new GTP interface\n");
673
674 return 0;
675
676out_hashtable:
677 gtp_hashtable_free(gtp);
678out_encap:
679 gtp_encap_disable(gtp);
459aa660
PN		 680 return err;
681}
682
683static void gtp_dellink(struct net_device *dev, struct list_head *head)
684{
685 struct gtp_dev *gtp = netdev_priv(dev);
686
687 gtp_encap_disable(gtp);
688 gtp_hashtable_free(gtp);
689 list_del_rcu(&gtp->list);
690 unregister_netdevice_queue(dev, head);
691}
692
693static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = {
694 [IFLA_GTP_FD0] = { .type = NLA_U32 },
695 [IFLA_GTP_FD1] = { .type = NLA_U32 },
696 [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 },
91ed81f9 697 [IFLA_GTP_ROLE] = { .type = NLA_U32 },
459aa660
PN		 698};
699
700static int gtp_validate(struct nlattr *tb[], struct nlattr *data[])
701{
702 if (!data)
703 return -EINVAL;
704
705 return 0;
706}
707
708static size_t gtp_get_size(const struct net_device *dev)
709{
710 return nla_total_size(sizeof(__u32)); /* IFLA_GTP_PDP_HASHSIZE */
711}
712
713static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev)
714{
715 struct gtp_dev *gtp = netdev_priv(dev);
716
717 if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size))
718 goto nla_put_failure;
719
720 return 0;
721
722nla_put_failure:
723 return -EMSGSIZE;
724}
725
726static struct rtnl_link_ops gtp_link_ops __read_mostly = {
727 .kind = "gtp",
728 .maxtype = IFLA_GTP_MAX,
729 .policy = gtp_policy,
730 .priv_size = sizeof(struct gtp_dev),
731 .setup = gtp_link_setup,
732 .validate = gtp_validate,
733 .newlink = gtp_newlink,
734 .dellink = gtp_dellink,
735 .get_size = gtp_get_size,
736 .fill_info = gtp_fill_info,
737};
738
459aa660
PN		 739static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize)
740{
741 int i;
742
743 gtp->addr_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL);
744 if (gtp->addr_hash == NULL)
745 return -ENOMEM;
746
747 gtp->tid_hash = kmalloc(sizeof(struct hlist_head) * hsize, 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;
758err1:
759 kfree(gtp->addr_hash);
760 return -ENOMEM;
761}
762
763static void gtp_hashtable_free(struct gtp_dev *gtp)
764{
765 struct pdp_ctx *pctx;
766 int i;
767
6b5e2e74
AS		 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
459aa660
PN		 772 synchronize_rcu();
773 kfree(gtp->addr_hash);
774 kfree(gtp->tid_hash);
775}
776
1e3a3abd
AS		 777static struct sock *gtp_encap_enable_socket(int fd, int type,
778 struct gtp_dev *gtp)
459aa660
PN		 779{
780 struct udp_tunnel_sock_cfg tuncfg = {NULL};
1e3a3abd
AS		 781 struct socket *sock;
782 struct sock *sk;
459aa660
PN		 783 int err;
784
1e3a3abd 785 pr_debug("enable gtp on %d, %d\n", fd, type);
459aa660 786
1e3a3abd
AS		 787 sock = sockfd_lookup(fd, &err);
788 if (!sock) {
789 pr_debug("gtp socket fd=%d not found\n", fd);
790 return NULL;
459aa660
PN		 791 }
792
1e3a3abd
AS		 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;
459aa660
PN		 797 }
798
1e3a3abd
AS		 799 if (rcu_dereference_sk_user_data(sock->sk)) {
800 sk = ERR_PTR(-EBUSY);
801 goto out_sock;
459aa660
PN		 802 }
803
1e3a3abd
AS		 804 sk = sock->sk;
805 sock_hold(sk);
459aa660
PN		 806
807 tuncfg.sk_user_data = gtp;
1e3a3abd 808 tuncfg.encap_type = type;
459aa660
PN		 809 tuncfg.encap_rcv = gtp_encap_recv;
810 tuncfg.encap_destroy = gtp_encap_destroy;
811
1e3a3abd 812 setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg);
459aa660 813
1e3a3abd
AS		 814out_sock:
815 sockfd_put(sock);
816 return sk;
817}
459aa660 818
1e3a3abd
AS		 819static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[])
820{
821 struct sock *sk1u = NULL;
822 struct sock *sk0 = NULL;
91ed81f9 823 unsigned int role = GTP_ROLE_GGSN;
1e3a3abd
AS		 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
91ed81f9
JB		 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
1e3a3abd
AS		 850 gtp->sk0 = sk0;
851 gtp->sk1u = sk1u;
91ed81f9 852 gtp->role = role;
1e3a3abd
AS		 853
854 return 0;
459aa660
PN		 855}
856
3fb94617 857static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[])
459aa660 858{
3fb94617
AS		 859 struct gtp_dev *gtp = NULL;
860 struct net_device *dev;
861 struct net *net;
459aa660 862
3fb94617
AS		 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]));
65d786c2 876 if (dev && dev->netdev_ops == &gtp_netdev_ops)
3fb94617
AS		 877 gtp = netdev_priv(dev);
878
879 put_net(net);
880 return gtp;
459aa660
PN		 881}
882
883static 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;
ae6336b5
JB		 887 pctx->peer_addr_ip4.s_addr =
888 nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]);
459aa660
PN		 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
101cfbc1
AS		 910static int ipv4_pdp_add(struct gtp_dev *gtp, struct sock *sk,
911 struct genl_info *info)
459aa660 912{
3fb94617 913 struct net_device *dev = gtp->dev;
459aa660
PN		 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
101cfbc1
AS		 952 sock_hold(sk);
953 pctx->sk = sk;
5b171f9c 954 pctx->dev = gtp->dev;
459aa660
PN		 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",
ae6336b5 978 pctx->u.v0.tid, &pctx->peer_addr_ip4,
459aa660
PN		 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,
ae6336b5 984 &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx);
459aa660
PN		 985 break;
986 }
987
988 return 0;
989}
990
101cfbc1
AS		 991static 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
6b5e2e74
AS		 999static void pdp_context_delete(struct pdp_ctx *pctx)
1000{
1001 hlist_del_rcu(&pctx->hlist_tid);
1002 hlist_del_rcu(&pctx->hlist_addr);
101cfbc1 1003 call_rcu(&pctx->rcu_head, pdp_context_free);
6b5e2e74
AS		 1004}
1005
459aa660
PN		 1006static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info)
1007{
101cfbc1 1008 unsigned int version;
3fb94617 1009 struct gtp_dev *gtp;
101cfbc1 1010 struct sock *sk;
3fb94617 1011 int err;
459aa660
PN		 1012
1013 if (!info->attrs[GTPA_VERSION] ||
1014 !info->attrs[GTPA_LINK] ||
ae6336b5 1015 !info->attrs[GTPA_PEER_ADDRESS] ||
459aa660
PN		 1016 !info->attrs[GTPA_MS_ADDRESS])
1017 return -EINVAL;
1018
101cfbc1
AS		 1019 version = nla_get_u32(info->attrs[GTPA_VERSION]);
1020
1021 switch (version) {
459aa660
PN		 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
3fb94617 1037 rcu_read_lock();
459aa660 1038
3fb94617
AS		 1039 gtp = gtp_find_dev(sock_net(skb->sk), info->attrs);
1040 if (!gtp) {
1041 err = -ENODEV;
1042 goto out_unlock;
27ee441a 1043 }
459aa660 1044
101cfbc1
AS		 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);
3fb94617
AS		 1058
1059out_unlock:
1060 rcu_read_unlock();
1061 return err;
459aa660
PN		 1062}
1063
d9e2dd12
AS		 1064static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net,
1065 struct nlattr *nla[])
459aa660 1066{
459aa660 1067 struct gtp_dev *gtp;
459aa660 1068
d9e2dd12
AS		 1069 gtp = gtp_find_dev(net, nla);
1070 if (!gtp)
1071 return ERR_PTR(-ENODEV);
459aa660 1072
d9e2dd12
AS		 1073 if (nla[GTPA_MS_ADDRESS]) {
1074 __be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]);
459aa660 1075
d9e2dd12
AS		 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]));
27ee441a 1084 }
459aa660 1085
d9e2dd12
AS		 1086 return ERR_PTR(-EINVAL);
1087}
459aa660 1088
d9e2dd12
AS		 1089static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[])
1090{
1091 struct pdp_ctx *pctx;
459aa660 1092
d9e2dd12
AS		 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
1104static 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);
3fb94617
AS		 1117 goto out_unlock;
1118 }
459aa660
PN		 1119
1120 if (pctx->gtp_version == GTP_V0)
d9e2dd12 1121 netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n",
459aa660
PN		 1122 pctx->u.v0.tid, pctx);
1123 else if (pctx->gtp_version == GTP_V1)
d9e2dd12 1124 netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n",
459aa660
PN		 1125 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
1126
6b5e2e74 1127 pdp_context_delete(pctx);
459aa660 1128
3fb94617
AS		 1129out_unlock:
1130 rcu_read_unlock();
1131 return err;
459aa660
PN		 1132}
1133
489111e5 1134static struct genl_family gtp_genl_family;
459aa660
PN		 1135
1136static 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) ||
ae6336b5 1147 nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) ||
459aa660
PN		 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
1166nlmsg_failure:
1167nla_put_failure:
1168 genlmsg_cancel(skb, genlh);
1169 return -EMSGSIZE;
1170}
1171
1172static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info)
1173{
1174 struct pdp_ctx *pctx = NULL;
459aa660 1175 struct sk_buff *skb2;
459aa660
PN		 1176 int err;
1177
d9e2dd12 1178 if (!info->attrs[GTPA_VERSION])
459aa660 1179 return -EINVAL;
459aa660 1180
3fb94617 1181 rcu_read_lock();
459aa660 1182
d9e2dd12
AS		 1183 pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
1184 if (IS_ERR(pctx)) {
1185 err = PTR_ERR(pctx);
459aa660
PN		 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
1203err_unlock_free:
1204 kfree_skb(skb2);
1205err_unlock:
1206 rcu_read_unlock();
1207 return err;
1208}
1209
1210static 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;
1250out:
1251 return skb->len;
1252}
1253
1254static 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, },
ae6336b5 1258 [GTPA_PEER_ADDRESS] = { .type = NLA_U32, },
459aa660
PN		 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
1266static const struct genl_ops gtp_genl_ops[] = {
1267 {
1268 .cmd = GTP_CMD_NEWPDP,
1269 .doit = gtp_genl_new_pdp,
1270 .policy = gtp_genl_policy,
1271 .flags = GENL_ADMIN_PERM,
1272 },
1273 {
1274 .cmd = GTP_CMD_DELPDP,
1275 .doit = gtp_genl_del_pdp,
1276 .policy = gtp_genl_policy,
1277 .flags = GENL_ADMIN_PERM,
1278 },
1279 {
1280 .cmd = GTP_CMD_GETPDP,
1281 .doit = gtp_genl_get_pdp,
1282 .dumpit = gtp_genl_dump_pdp,
1283 .policy = gtp_genl_policy,
1284 .flags = GENL_ADMIN_PERM,
1285 },
1286};
1287
56989f6d 1288static struct genl_family gtp_genl_family __ro_after_init = {
489111e5
JB		 1289 .name = "gtp",
1290 .version = 0,
1291 .hdrsize = 0,
1292 .maxattr = GTPA_MAX,
1293 .netnsok = true,
1294 .module = THIS_MODULE,
1295 .ops = gtp_genl_ops,
1296 .n_ops = ARRAY_SIZE(gtp_genl_ops),
1297};
1298
459aa660
PN		 1299static int __net_init gtp_net_init(struct net *net)
1300{
1301 struct gtp_net *gn = net_generic(net, gtp_net_id);
1302
1303 INIT_LIST_HEAD(&gn->gtp_dev_list);
1304 return 0;
1305}
1306
1307static void __net_exit gtp_net_exit(struct net *net)
1308{
1309 struct gtp_net *gn = net_generic(net, gtp_net_id);
1310 struct gtp_dev *gtp;
1311 LIST_HEAD(list);
1312
1313 rtnl_lock();
1314 list_for_each_entry(gtp, &gn->gtp_dev_list, list)
1315 gtp_dellink(gtp->dev, &list);
1316
1317 unregister_netdevice_many(&list);
1318 rtnl_unlock();
1319}
1320
1321static struct pernet_operations gtp_net_ops = {
1322 .init = gtp_net_init,
1323 .exit = gtp_net_exit,
1324 .id = &gtp_net_id,
1325 .size = sizeof(struct gtp_net),
1326};
1327
1328static int __init gtp_init(void)
1329{
1330 int err;
1331
1332 get_random_bytes(&gtp_h_initval, sizeof(gtp_h_initval));
1333
1334 err = rtnl_link_register(&gtp_link_ops);
1335 if (err < 0)
1336 goto error_out;
1337
489111e5 1338 err = genl_register_family(&gtp_genl_family);
459aa660
PN		 1339 if (err < 0)
1340 goto unreg_rtnl_link;
1341
1342 err = register_pernet_subsys(&gtp_net_ops);
1343 if (err < 0)
1344 goto unreg_genl_family;
1345
5b5e0928 1346 pr_info("GTP module loaded (pdp ctx size %zd bytes)\n",
459aa660
PN		 1347 sizeof(struct pdp_ctx));
1348 return 0;
1349
1350unreg_genl_family:
1351 genl_unregister_family(&gtp_genl_family);
1352unreg_rtnl_link:
1353 rtnl_link_unregister(&gtp_link_ops);
1354error_out:
1355 pr_err("error loading GTP module loaded\n");
1356 return err;
1357}
1358late_initcall(gtp_init);
1359
1360static void __exit gtp_fini(void)
1361{
1362 unregister_pernet_subsys(&gtp_net_ops);
1363 genl_unregister_family(&gtp_genl_family);
1364 rtnl_link_unregister(&gtp_link_ops);
1365
1366 pr_info("GTP module unloaded\n");
1367}
1368module_exit(gtp_fini);
1369
1370MODULE_LICENSE("GPL");
1371MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>");
1372MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic");
1373MODULE_ALIAS_RTNL_LINK("gtp");
ab729823 1374MODULE_ALIAS_GENL_FAMILY("gtp");