Commit | Line | Data |
---|---|---|
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> | |
19 | #include <linux/version.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <linux/udp.h> | |
22 | #include <linux/rculist.h> | |
23 | #include <linux/jhash.h> | |
24 | #include <linux/if_tunnel.h> | |
25 | #include <linux/net.h> | |
26 | #include <linux/file.h> | |
27 | #include <linux/gtp.h> | |
28 | ||
29 | #include <net/net_namespace.h> | |
30 | #include <net/protocol.h> | |
31 | #include <net/ip.h> | |
32 | #include <net/udp.h> | |
33 | #include <net/udp_tunnel.h> | |
34 | #include <net/icmp.h> | |
35 | #include <net/xfrm.h> | |
36 | #include <net/genetlink.h> | |
37 | #include <net/netns/generic.h> | |
38 | #include <net/gtp.h> | |
39 | ||
40 | /* An active session for the subscriber. */ | |
41 | struct pdp_ctx { | |
42 | struct hlist_node hlist_tid; | |
43 | struct hlist_node hlist_addr; | |
44 | ||
45 | union { | |
46 | u64 tid; | |
47 | struct { | |
48 | u64 tid; | |
49 | u16 flow; | |
50 | } v0; | |
51 | struct { | |
52 | u32 i_tei; | |
53 | u32 o_tei; | |
54 | } v1; | |
55 | } u; | |
56 | u8 gtp_version; | |
57 | u16 af; | |
58 | ||
59 | struct in_addr ms_addr_ip4; | |
60 | struct in_addr sgsn_addr_ip4; | |
61 | ||
62 | atomic_t tx_seq; | |
63 | struct rcu_head rcu_head; | |
64 | }; | |
65 | ||
66 | /* One instance of the GTP device. */ | |
67 | struct gtp_dev { | |
68 | struct list_head list; | |
69 | ||
70 | struct socket *sock0; | |
71 | struct socket *sock1u; | |
72 | ||
73 | struct net *net; | |
74 | struct net_device *dev; | |
75 | ||
76 | unsigned int hash_size; | |
77 | struct hlist_head *tid_hash; | |
78 | struct hlist_head *addr_hash; | |
79 | }; | |
80 | ||
81 | static int gtp_net_id __read_mostly; | |
82 | ||
83 | struct gtp_net { | |
84 | struct list_head gtp_dev_list; | |
85 | }; | |
86 | ||
87 | static u32 gtp_h_initval; | |
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 = >p->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 = >p->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 = >p->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_src_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx, | |
155 | unsigned int hdrlen) | |
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 + sizeof(struct iphdr)); | |
163 | ||
164 | return iph->saddr != pctx->ms_addr_ip4.s_addr; | |
165 | } | |
166 | ||
167 | /* Check if the inner IP source address in this packet is assigned to any | |
168 | * existing mobile subscriber. | |
169 | */ | |
170 | static bool gtp_check_src_ms(struct sk_buff *skb, struct pdp_ctx *pctx, | |
171 | unsigned int hdrlen) | |
172 | { | |
173 | switch (ntohs(skb->protocol)) { | |
174 | case ETH_P_IP: | |
175 | return gtp_check_src_ms_ipv4(skb, pctx, hdrlen); | |
176 | } | |
177 | return false; | |
178 | } | |
179 | ||
180 | /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */ | |
181 | static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, | |
182 | bool xnet) | |
183 | { | |
184 | unsigned int hdrlen = sizeof(struct udphdr) + | |
185 | sizeof(struct gtp0_header); | |
186 | struct gtp0_header *gtp0; | |
187 | struct pdp_ctx *pctx; | |
188 | int ret = 0; | |
189 | ||
190 | if (!pskb_may_pull(skb, hdrlen)) | |
191 | return -1; | |
192 | ||
193 | gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); | |
194 | ||
195 | if ((gtp0->flags >> 5) != GTP_V0) | |
196 | return 1; | |
197 | ||
198 | if (gtp0->type != GTP_TPDU) | |
199 | return 1; | |
200 | ||
201 | rcu_read_lock(); | |
202 | pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid)); | |
203 | if (!pctx) { | |
204 | netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); | |
205 | ret = -1; | |
206 | goto out_rcu; | |
207 | } | |
208 | ||
209 | if (!gtp_check_src_ms(skb, pctx, hdrlen)) { | |
210 | netdev_dbg(gtp->dev, "No PDP ctx for this MS\n"); | |
211 | ret = -1; | |
212 | goto out_rcu; | |
213 | } | |
214 | rcu_read_unlock(); | |
215 | ||
216 | /* Get rid of the GTP + UDP headers. */ | |
217 | return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet); | |
218 | out_rcu: | |
219 | rcu_read_unlock(); | |
220 | return ret; | |
221 | } | |
222 | ||
223 | static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, | |
224 | bool xnet) | |
225 | { | |
226 | unsigned int hdrlen = sizeof(struct udphdr) + | |
227 | sizeof(struct gtp1_header); | |
228 | struct gtp1_header *gtp1; | |
229 | struct pdp_ctx *pctx; | |
230 | int ret = 0; | |
231 | ||
232 | if (!pskb_may_pull(skb, hdrlen)) | |
233 | return -1; | |
234 | ||
235 | gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); | |
236 | ||
237 | if ((gtp1->flags >> 5) != GTP_V1) | |
238 | return 1; | |
239 | ||
240 | if (gtp1->type != GTP_TPDU) | |
241 | return 1; | |
242 | ||
243 | /* From 29.060: "This field shall be present if and only if any one or | |
244 | * more of the S, PN and E flags are set.". | |
245 | * | |
246 | * If any of the bit is set, then the remaining ones also have to be | |
247 | * set. | |
248 | */ | |
249 | if (gtp1->flags & GTP1_F_MASK) | |
250 | hdrlen += 4; | |
251 | ||
252 | /* Make sure the header is larger enough, including extensions. */ | |
253 | if (!pskb_may_pull(skb, hdrlen)) | |
254 | return -1; | |
255 | ||
93edb8c7 PN |
256 | gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); |
257 | ||
459aa660 PN |
258 | rcu_read_lock(); |
259 | pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid)); | |
260 | if (!pctx) { | |
261 | netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); | |
262 | ret = -1; | |
263 | goto out_rcu; | |
264 | } | |
265 | ||
266 | if (!gtp_check_src_ms(skb, pctx, hdrlen)) { | |
267 | netdev_dbg(gtp->dev, "No PDP ctx for this MS\n"); | |
268 | ret = -1; | |
269 | goto out_rcu; | |
270 | } | |
271 | rcu_read_unlock(); | |
272 | ||
273 | /* Get rid of the GTP + UDP headers. */ | |
274 | return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet); | |
275 | out_rcu: | |
276 | rcu_read_unlock(); | |
277 | return ret; | |
278 | } | |
279 | ||
280 | static void gtp_encap_disable(struct gtp_dev *gtp) | |
281 | { | |
282 | if (gtp->sock0 && gtp->sock0->sk) { | |
283 | udp_sk(gtp->sock0->sk)->encap_type = 0; | |
284 | rcu_assign_sk_user_data(gtp->sock0->sk, NULL); | |
285 | } | |
286 | if (gtp->sock1u && gtp->sock1u->sk) { | |
287 | udp_sk(gtp->sock1u->sk)->encap_type = 0; | |
288 | rcu_assign_sk_user_data(gtp->sock1u->sk, NULL); | |
289 | } | |
290 | ||
291 | gtp->sock0 = NULL; | |
292 | gtp->sock1u = NULL; | |
293 | } | |
294 | ||
295 | static void gtp_encap_destroy(struct sock *sk) | |
296 | { | |
297 | struct gtp_dev *gtp; | |
298 | ||
299 | gtp = rcu_dereference_sk_user_data(sk); | |
300 | if (gtp) | |
301 | gtp_encap_disable(gtp); | |
302 | } | |
303 | ||
304 | /* UDP encapsulation receive handler. See net/ipv4/udp.c. | |
305 | * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket. | |
306 | */ | |
307 | static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
308 | { | |
309 | struct pcpu_sw_netstats *stats; | |
310 | struct gtp_dev *gtp; | |
311 | bool xnet; | |
312 | int ret; | |
313 | ||
314 | gtp = rcu_dereference_sk_user_data(sk); | |
315 | if (!gtp) | |
316 | return 1; | |
317 | ||
318 | netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); | |
319 | ||
320 | xnet = !net_eq(gtp->net, dev_net(gtp->dev)); | |
321 | ||
322 | switch (udp_sk(sk)->encap_type) { | |
323 | case UDP_ENCAP_GTP0: | |
324 | netdev_dbg(gtp->dev, "received GTP0 packet\n"); | |
325 | ret = gtp0_udp_encap_recv(gtp, skb, xnet); | |
326 | break; | |
327 | case UDP_ENCAP_GTP1U: | |
328 | netdev_dbg(gtp->dev, "received GTP1U packet\n"); | |
329 | ret = gtp1u_udp_encap_recv(gtp, skb, xnet); | |
330 | break; | |
331 | default: | |
332 | ret = -1; /* Shouldn't happen. */ | |
333 | } | |
334 | ||
335 | switch (ret) { | |
336 | case 1: | |
337 | netdev_dbg(gtp->dev, "pass up to the process\n"); | |
338 | return 1; | |
339 | case 0: | |
340 | netdev_dbg(gtp->dev, "forwarding packet from GGSN to uplink\n"); | |
341 | break; | |
342 | case -1: | |
343 | netdev_dbg(gtp->dev, "GTP packet has been dropped\n"); | |
344 | kfree_skb(skb); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | /* Now that the UDP and the GTP header have been removed, set up the | |
349 | * new network header. This is required by the upper layer to | |
350 | * calculate the transport header. | |
351 | */ | |
352 | skb_reset_network_header(skb); | |
353 | ||
354 | skb->dev = gtp->dev; | |
355 | ||
356 | stats = this_cpu_ptr(gtp->dev->tstats); | |
357 | u64_stats_update_begin(&stats->syncp); | |
358 | stats->rx_packets++; | |
359 | stats->rx_bytes += skb->len; | |
360 | u64_stats_update_end(&stats->syncp); | |
361 | ||
362 | netif_rx(skb); | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | static int gtp_dev_init(struct net_device *dev) | |
368 | { | |
369 | struct gtp_dev *gtp = netdev_priv(dev); | |
370 | ||
371 | gtp->dev = dev; | |
372 | ||
373 | dev->tstats = alloc_percpu(struct pcpu_sw_netstats); | |
374 | if (!dev->tstats) | |
375 | return -ENOMEM; | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static void gtp_dev_uninit(struct net_device *dev) | |
381 | { | |
382 | struct gtp_dev *gtp = netdev_priv(dev); | |
383 | ||
384 | gtp_encap_disable(gtp); | |
385 | free_percpu(dev->tstats); | |
386 | } | |
387 | ||
388 | static struct rtable *ip4_route_output_gtp(struct net *net, struct flowi4 *fl4, | |
389 | const struct sock *sk, __be32 daddr) | |
390 | { | |
391 | memset(fl4, 0, sizeof(*fl4)); | |
392 | fl4->flowi4_oif = sk->sk_bound_dev_if; | |
393 | fl4->daddr = daddr; | |
394 | fl4->saddr = inet_sk(sk)->inet_saddr; | |
395 | fl4->flowi4_tos = RT_CONN_FLAGS(sk); | |
396 | fl4->flowi4_proto = sk->sk_protocol; | |
397 | ||
398 | return ip_route_output_key(net, fl4); | |
399 | } | |
400 | ||
401 | static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) | |
402 | { | |
403 | int payload_len = skb->len; | |
404 | struct gtp0_header *gtp0; | |
405 | ||
406 | gtp0 = (struct gtp0_header *) skb_push(skb, sizeof(*gtp0)); | |
407 | ||
408 | gtp0->flags = 0x1e; /* v0, GTP-non-prime. */ | |
409 | gtp0->type = GTP_TPDU; | |
410 | gtp0->length = htons(payload_len); | |
411 | gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff); | |
412 | gtp0->flow = htons(pctx->u.v0.flow); | |
413 | gtp0->number = 0xff; | |
414 | gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff; | |
415 | gtp0->tid = cpu_to_be64(pctx->u.v0.tid); | |
416 | } | |
417 | ||
418 | static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) | |
419 | { | |
420 | int payload_len = skb->len; | |
421 | struct gtp1_header *gtp1; | |
422 | ||
423 | gtp1 = (struct gtp1_header *) skb_push(skb, sizeof(*gtp1)); | |
424 | ||
425 | /* Bits 8 7 6 5 4 3 2 1 | |
426 | * +--+--+--+--+--+--+--+--+ | |
427 | * |version |PT| 1| E| S|PN| | |
428 | * +--+--+--+--+--+--+--+--+ | |
429 | * 0 0 1 1 1 0 0 0 | |
430 | */ | |
431 | gtp1->flags = 0x38; /* v1, GTP-non-prime. */ | |
432 | gtp1->type = GTP_TPDU; | |
433 | gtp1->length = htons(payload_len); | |
434 | gtp1->tid = htonl(pctx->u.v1.o_tei); | |
435 | ||
436 | /* TODO: Suppport for extension header, sequence number and N-PDU. | |
437 | * Update the length field if any of them is available. | |
438 | */ | |
439 | } | |
440 | ||
441 | struct gtp_pktinfo { | |
442 | struct sock *sk; | |
443 | struct iphdr *iph; | |
444 | struct flowi4 fl4; | |
445 | struct rtable *rt; | |
446 | struct pdp_ctx *pctx; | |
447 | struct net_device *dev; | |
448 | __be16 gtph_port; | |
449 | }; | |
450 | ||
451 | static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo) | |
452 | { | |
453 | switch (pktinfo->pctx->gtp_version) { | |
454 | case GTP_V0: | |
455 | pktinfo->gtph_port = htons(GTP0_PORT); | |
456 | gtp0_push_header(skb, pktinfo->pctx); | |
457 | break; | |
458 | case GTP_V1: | |
459 | pktinfo->gtph_port = htons(GTP1U_PORT); | |
460 | gtp1_push_header(skb, pktinfo->pctx); | |
461 | break; | |
462 | } | |
463 | } | |
464 | ||
465 | static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, | |
466 | struct sock *sk, struct iphdr *iph, | |
467 | struct pdp_ctx *pctx, struct rtable *rt, | |
468 | struct flowi4 *fl4, | |
469 | struct net_device *dev) | |
470 | { | |
471 | pktinfo->sk = sk; | |
472 | pktinfo->iph = iph; | |
473 | pktinfo->pctx = pctx; | |
474 | pktinfo->rt = rt; | |
475 | pktinfo->fl4 = *fl4; | |
476 | pktinfo->dev = dev; | |
477 | } | |
478 | ||
479 | static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, | |
480 | struct gtp_pktinfo *pktinfo) | |
481 | { | |
482 | struct gtp_dev *gtp = netdev_priv(dev); | |
483 | struct pdp_ctx *pctx; | |
484 | struct rtable *rt; | |
485 | struct flowi4 fl4; | |
486 | struct iphdr *iph; | |
487 | struct sock *sk; | |
488 | __be16 df; | |
489 | int mtu; | |
490 | ||
491 | /* Read the IP destination address and resolve the PDP context. | |
492 | * Prepend PDP header with TEI/TID from PDP ctx. | |
493 | */ | |
494 | iph = ip_hdr(skb); | |
495 | pctx = ipv4_pdp_find(gtp, iph->daddr); | |
496 | if (!pctx) { | |
497 | netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", | |
498 | &iph->daddr); | |
499 | return -ENOENT; | |
500 | } | |
501 | netdev_dbg(dev, "found PDP context %p\n", pctx); | |
502 | ||
503 | switch (pctx->gtp_version) { | |
504 | case GTP_V0: | |
505 | if (gtp->sock0) | |
506 | sk = gtp->sock0->sk; | |
507 | else | |
508 | sk = NULL; | |
509 | break; | |
510 | case GTP_V1: | |
511 | if (gtp->sock1u) | |
512 | sk = gtp->sock1u->sk; | |
513 | else | |
514 | sk = NULL; | |
515 | break; | |
516 | default: | |
517 | return -ENOENT; | |
518 | } | |
519 | ||
520 | if (!sk) { | |
521 | netdev_dbg(dev, "no userspace socket is available, skip\n"); | |
522 | return -ENOENT; | |
523 | } | |
524 | ||
525 | rt = ip4_route_output_gtp(sock_net(sk), &fl4, gtp->sock0->sk, | |
526 | pctx->sgsn_addr_ip4.s_addr); | |
527 | if (IS_ERR(rt)) { | |
528 | netdev_dbg(dev, "no route to SSGN %pI4\n", | |
529 | &pctx->sgsn_addr_ip4.s_addr); | |
530 | dev->stats.tx_carrier_errors++; | |
531 | goto err; | |
532 | } | |
533 | ||
534 | if (rt->dst.dev == dev) { | |
535 | netdev_dbg(dev, "circular route to SSGN %pI4\n", | |
536 | &pctx->sgsn_addr_ip4.s_addr); | |
537 | dev->stats.collisions++; | |
538 | goto err_rt; | |
539 | } | |
540 | ||
541 | skb_dst_drop(skb); | |
542 | ||
543 | /* This is similar to tnl_update_pmtu(). */ | |
544 | df = iph->frag_off; | |
545 | if (df) { | |
546 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - | |
547 | sizeof(struct iphdr) - sizeof(struct udphdr); | |
548 | switch (pctx->gtp_version) { | |
549 | case GTP_V0: | |
550 | mtu -= sizeof(struct gtp0_header); | |
551 | break; | |
552 | case GTP_V1: | |
553 | mtu -= sizeof(struct gtp1_header); | |
554 | break; | |
555 | } | |
556 | } else { | |
557 | mtu = dst_mtu(&rt->dst); | |
558 | } | |
559 | ||
560 | rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu); | |
561 | ||
562 | if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) && | |
563 | mtu < ntohs(iph->tot_len)) { | |
564 | netdev_dbg(dev, "packet too big, fragmentation needed\n"); | |
565 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
566 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
567 | htonl(mtu)); | |
568 | goto err_rt; | |
569 | } | |
570 | ||
571 | gtp_set_pktinfo_ipv4(pktinfo, sk, iph, pctx, rt, &fl4, dev); | |
572 | gtp_push_header(skb, pktinfo); | |
573 | ||
574 | return 0; | |
575 | err_rt: | |
576 | ip_rt_put(rt); | |
577 | err: | |
578 | return -EBADMSG; | |
579 | } | |
580 | ||
581 | static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) | |
582 | { | |
583 | unsigned int proto = ntohs(skb->protocol); | |
584 | struct gtp_pktinfo pktinfo; | |
585 | int err; | |
586 | ||
587 | /* Ensure there is sufficient headroom. */ | |
588 | if (skb_cow_head(skb, dev->needed_headroom)) | |
589 | goto tx_err; | |
590 | ||
591 | skb_reset_inner_headers(skb); | |
592 | ||
593 | /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */ | |
594 | rcu_read_lock(); | |
595 | switch (proto) { | |
596 | case ETH_P_IP: | |
597 | err = gtp_build_skb_ip4(skb, dev, &pktinfo); | |
598 | break; | |
599 | default: | |
600 | err = -EOPNOTSUPP; | |
601 | break; | |
602 | } | |
603 | rcu_read_unlock(); | |
604 | ||
605 | if (err < 0) | |
606 | goto tx_err; | |
607 | ||
608 | switch (proto) { | |
609 | case ETH_P_IP: | |
610 | netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n", | |
611 | &pktinfo.iph->saddr, &pktinfo.iph->daddr); | |
612 | udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, | |
613 | pktinfo.fl4.saddr, pktinfo.fl4.daddr, | |
614 | pktinfo.iph->tos, | |
615 | ip4_dst_hoplimit(&pktinfo.rt->dst), | |
616 | htons(IP_DF), | |
617 | pktinfo.gtph_port, pktinfo.gtph_port, | |
618 | true, false); | |
619 | break; | |
620 | } | |
621 | ||
622 | return NETDEV_TX_OK; | |
623 | tx_err: | |
624 | dev->stats.tx_errors++; | |
625 | dev_kfree_skb(skb); | |
626 | return NETDEV_TX_OK; | |
627 | } | |
628 | ||
629 | static const struct net_device_ops gtp_netdev_ops = { | |
630 | .ndo_init = gtp_dev_init, | |
631 | .ndo_uninit = gtp_dev_uninit, | |
632 | .ndo_start_xmit = gtp_dev_xmit, | |
633 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
634 | }; | |
635 | ||
636 | static void gtp_link_setup(struct net_device *dev) | |
637 | { | |
638 | dev->netdev_ops = >p_netdev_ops; | |
639 | dev->destructor = free_netdev; | |
640 | ||
641 | dev->hard_header_len = 0; | |
642 | dev->addr_len = 0; | |
643 | ||
644 | /* Zero header length. */ | |
645 | dev->type = ARPHRD_NONE; | |
646 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
647 | ||
648 | dev->priv_flags |= IFF_NO_QUEUE; | |
649 | dev->features |= NETIF_F_LLTX; | |
650 | netif_keep_dst(dev); | |
651 | ||
652 | /* Assume largest header, ie. GTPv0. */ | |
653 | dev->needed_headroom = LL_MAX_HEADER + | |
654 | sizeof(struct iphdr) + | |
655 | sizeof(struct udphdr) + | |
656 | sizeof(struct gtp0_header); | |
657 | } | |
658 | ||
659 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); | |
660 | static void gtp_hashtable_free(struct gtp_dev *gtp); | |
661 | static int gtp_encap_enable(struct net_device *dev, struct gtp_dev *gtp, | |
662 | int fd_gtp0, int fd_gtp1, struct net *src_net); | |
663 | ||
664 | static int gtp_newlink(struct net *src_net, struct net_device *dev, | |
665 | struct nlattr *tb[], struct nlattr *data[]) | |
666 | { | |
667 | int hashsize, err, fd0, fd1; | |
668 | struct gtp_dev *gtp; | |
669 | struct gtp_net *gn; | |
670 | ||
671 | if (!data[IFLA_GTP_FD0] || !data[IFLA_GTP_FD1]) | |
672 | return -EINVAL; | |
673 | ||
674 | gtp = netdev_priv(dev); | |
675 | ||
676 | fd0 = nla_get_u32(data[IFLA_GTP_FD0]); | |
677 | fd1 = nla_get_u32(data[IFLA_GTP_FD1]); | |
678 | ||
679 | err = gtp_encap_enable(dev, gtp, fd0, fd1, src_net); | |
680 | if (err < 0) | |
681 | goto out_err; | |
682 | ||
683 | if (!data[IFLA_GTP_PDP_HASHSIZE]) | |
684 | hashsize = 1024; | |
685 | else | |
686 | hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]); | |
687 | ||
688 | err = gtp_hashtable_new(gtp, hashsize); | |
689 | if (err < 0) | |
690 | goto out_encap; | |
691 | ||
692 | err = register_netdevice(dev); | |
693 | if (err < 0) { | |
694 | netdev_dbg(dev, "failed to register new netdev %d\n", err); | |
695 | goto out_hashtable; | |
696 | } | |
697 | ||
698 | gn = net_generic(dev_net(dev), gtp_net_id); | |
699 | list_add_rcu(>p->list, &gn->gtp_dev_list); | |
700 | ||
701 | netdev_dbg(dev, "registered new GTP interface\n"); | |
702 | ||
703 | return 0; | |
704 | ||
705 | out_hashtable: | |
706 | gtp_hashtable_free(gtp); | |
707 | out_encap: | |
708 | gtp_encap_disable(gtp); | |
709 | out_err: | |
710 | return err; | |
711 | } | |
712 | ||
713 | static void gtp_dellink(struct net_device *dev, struct list_head *head) | |
714 | { | |
715 | struct gtp_dev *gtp = netdev_priv(dev); | |
716 | ||
717 | gtp_encap_disable(gtp); | |
718 | gtp_hashtable_free(gtp); | |
719 | list_del_rcu(>p->list); | |
720 | unregister_netdevice_queue(dev, head); | |
721 | } | |
722 | ||
723 | static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = { | |
724 | [IFLA_GTP_FD0] = { .type = NLA_U32 }, | |
725 | [IFLA_GTP_FD1] = { .type = NLA_U32 }, | |
726 | [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 }, | |
727 | }; | |
728 | ||
729 | static int gtp_validate(struct nlattr *tb[], struct nlattr *data[]) | |
730 | { | |
731 | if (!data) | |
732 | return -EINVAL; | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
737 | static size_t gtp_get_size(const struct net_device *dev) | |
738 | { | |
739 | return nla_total_size(sizeof(__u32)); /* IFLA_GTP_PDP_HASHSIZE */ | |
740 | } | |
741 | ||
742 | static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
743 | { | |
744 | struct gtp_dev *gtp = netdev_priv(dev); | |
745 | ||
746 | if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size)) | |
747 | goto nla_put_failure; | |
748 | ||
749 | return 0; | |
750 | ||
751 | nla_put_failure: | |
752 | return -EMSGSIZE; | |
753 | } | |
754 | ||
755 | static struct rtnl_link_ops gtp_link_ops __read_mostly = { | |
756 | .kind = "gtp", | |
757 | .maxtype = IFLA_GTP_MAX, | |
758 | .policy = gtp_policy, | |
759 | .priv_size = sizeof(struct gtp_dev), | |
760 | .setup = gtp_link_setup, | |
761 | .validate = gtp_validate, | |
762 | .newlink = gtp_newlink, | |
763 | .dellink = gtp_dellink, | |
764 | .get_size = gtp_get_size, | |
765 | .fill_info = gtp_fill_info, | |
766 | }; | |
767 | ||
768 | static struct net *gtp_genl_get_net(struct net *src_net, struct nlattr *tb[]) | |
769 | { | |
770 | struct net *net; | |
771 | ||
772 | /* Examine the link attributes and figure out which network namespace | |
773 | * we are talking about. | |
774 | */ | |
775 | if (tb[GTPA_NET_NS_FD]) | |
776 | net = get_net_ns_by_fd(nla_get_u32(tb[GTPA_NET_NS_FD])); | |
777 | else | |
778 | net = get_net(src_net); | |
779 | ||
780 | return net; | |
781 | } | |
782 | ||
783 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) | |
784 | { | |
785 | int i; | |
786 | ||
787 | gtp->addr_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL); | |
788 | if (gtp->addr_hash == NULL) | |
789 | return -ENOMEM; | |
790 | ||
791 | gtp->tid_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL); | |
792 | if (gtp->tid_hash == NULL) | |
793 | goto err1; | |
794 | ||
795 | gtp->hash_size = hsize; | |
796 | ||
797 | for (i = 0; i < hsize; i++) { | |
798 | INIT_HLIST_HEAD(>p->addr_hash[i]); | |
799 | INIT_HLIST_HEAD(>p->tid_hash[i]); | |
800 | } | |
801 | return 0; | |
802 | err1: | |
803 | kfree(gtp->addr_hash); | |
804 | return -ENOMEM; | |
805 | } | |
806 | ||
807 | static void gtp_hashtable_free(struct gtp_dev *gtp) | |
808 | { | |
809 | struct pdp_ctx *pctx; | |
810 | int i; | |
811 | ||
812 | for (i = 0; i < gtp->hash_size; i++) { | |
813 | hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) { | |
814 | hlist_del_rcu(&pctx->hlist_tid); | |
815 | hlist_del_rcu(&pctx->hlist_addr); | |
816 | kfree_rcu(pctx, rcu_head); | |
817 | } | |
818 | } | |
819 | synchronize_rcu(); | |
820 | kfree(gtp->addr_hash); | |
821 | kfree(gtp->tid_hash); | |
822 | } | |
823 | ||
824 | static int gtp_encap_enable(struct net_device *dev, struct gtp_dev *gtp, | |
825 | int fd_gtp0, int fd_gtp1, struct net *src_net) | |
826 | { | |
827 | struct udp_tunnel_sock_cfg tuncfg = {NULL}; | |
828 | struct socket *sock0, *sock1u; | |
829 | int err; | |
830 | ||
831 | netdev_dbg(dev, "enable gtp on %d, %d\n", fd_gtp0, fd_gtp1); | |
832 | ||
833 | sock0 = sockfd_lookup(fd_gtp0, &err); | |
834 | if (sock0 == NULL) { | |
835 | netdev_dbg(dev, "socket fd=%d not found (gtp0)\n", fd_gtp0); | |
836 | return -ENOENT; | |
837 | } | |
838 | ||
839 | if (sock0->sk->sk_protocol != IPPROTO_UDP) { | |
840 | netdev_dbg(dev, "socket fd=%d not UDP\n", fd_gtp0); | |
841 | err = -EINVAL; | |
842 | goto err1; | |
843 | } | |
844 | ||
845 | sock1u = sockfd_lookup(fd_gtp1, &err); | |
846 | if (sock1u == NULL) { | |
847 | netdev_dbg(dev, "socket fd=%d not found (gtp1u)\n", fd_gtp1); | |
848 | err = -ENOENT; | |
849 | goto err1; | |
850 | } | |
851 | ||
852 | if (sock1u->sk->sk_protocol != IPPROTO_UDP) { | |
853 | netdev_dbg(dev, "socket fd=%d not UDP\n", fd_gtp1); | |
854 | err = -EINVAL; | |
855 | goto err2; | |
856 | } | |
857 | ||
858 | netdev_dbg(dev, "enable gtp on %p, %p\n", sock0, sock1u); | |
859 | ||
860 | gtp->sock0 = sock0; | |
861 | gtp->sock1u = sock1u; | |
862 | gtp->net = src_net; | |
863 | ||
864 | tuncfg.sk_user_data = gtp; | |
865 | tuncfg.encap_rcv = gtp_encap_recv; | |
866 | tuncfg.encap_destroy = gtp_encap_destroy; | |
867 | ||
868 | tuncfg.encap_type = UDP_ENCAP_GTP0; | |
869 | setup_udp_tunnel_sock(sock_net(gtp->sock0->sk), gtp->sock0, &tuncfg); | |
870 | ||
871 | tuncfg.encap_type = UDP_ENCAP_GTP1U; | |
872 | setup_udp_tunnel_sock(sock_net(gtp->sock1u->sk), gtp->sock1u, &tuncfg); | |
873 | ||
874 | err = 0; | |
875 | err2: | |
876 | sockfd_put(sock1u); | |
877 | err1: | |
878 | sockfd_put(sock0); | |
879 | return err; | |
880 | } | |
881 | ||
882 | static struct net_device *gtp_find_dev(struct net *net, int ifindex) | |
883 | { | |
884 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
885 | struct gtp_dev *gtp; | |
886 | ||
887 | list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { | |
888 | if (ifindex == gtp->dev->ifindex) | |
889 | return gtp->dev; | |
890 | } | |
891 | return NULL; | |
892 | } | |
893 | ||
894 | static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) | |
895 | { | |
896 | pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); | |
897 | pctx->af = AF_INET; | |
898 | pctx->sgsn_addr_ip4.s_addr = | |
899 | nla_get_be32(info->attrs[GTPA_SGSN_ADDRESS]); | |
900 | pctx->ms_addr_ip4.s_addr = | |
901 | nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
902 | ||
903 | switch (pctx->gtp_version) { | |
904 | case GTP_V0: | |
905 | /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow | |
906 | * label needs to be the same for uplink and downlink packets, | |
907 | * so let's annotate this. | |
908 | */ | |
909 | pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]); | |
910 | pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]); | |
911 | break; | |
912 | case GTP_V1: | |
913 | pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]); | |
914 | pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]); | |
915 | break; | |
916 | default: | |
917 | break; | |
918 | } | |
919 | } | |
920 | ||
921 | static int ipv4_pdp_add(struct net_device *dev, struct genl_info *info) | |
922 | { | |
923 | struct gtp_dev *gtp = netdev_priv(dev); | |
924 | u32 hash_ms, hash_tid = 0; | |
925 | struct pdp_ctx *pctx; | |
926 | bool found = false; | |
927 | __be32 ms_addr; | |
928 | ||
929 | ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
930 | hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size; | |
931 | ||
932 | hlist_for_each_entry_rcu(pctx, >p->addr_hash[hash_ms], hlist_addr) { | |
933 | if (pctx->ms_addr_ip4.s_addr == ms_addr) { | |
934 | found = true; | |
935 | break; | |
936 | } | |
937 | } | |
938 | ||
939 | if (found) { | |
940 | if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) | |
941 | return -EEXIST; | |
942 | if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE) | |
943 | return -EOPNOTSUPP; | |
944 | ||
945 | ipv4_pdp_fill(pctx, info); | |
946 | ||
947 | if (pctx->gtp_version == GTP_V0) | |
948 | netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n", | |
949 | pctx->u.v0.tid, pctx); | |
950 | else if (pctx->gtp_version == GTP_V1) | |
951 | netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n", | |
952 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); | |
953 | ||
954 | return 0; | |
955 | ||
956 | } | |
957 | ||
958 | pctx = kmalloc(sizeof(struct pdp_ctx), GFP_KERNEL); | |
959 | if (pctx == NULL) | |
960 | return -ENOMEM; | |
961 | ||
962 | ipv4_pdp_fill(pctx, info); | |
963 | atomic_set(&pctx->tx_seq, 0); | |
964 | ||
965 | switch (pctx->gtp_version) { | |
966 | case GTP_V0: | |
967 | /* TS 09.60: "The flow label identifies unambiguously a GTP | |
968 | * flow.". We use the tid for this instead, I cannot find a | |
969 | * situation in which this doesn't unambiguosly identify the | |
970 | * PDP context. | |
971 | */ | |
972 | hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size; | |
973 | break; | |
974 | case GTP_V1: | |
975 | hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size; | |
976 | break; | |
977 | } | |
978 | ||
979 | hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]); | |
980 | hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]); | |
981 | ||
982 | switch (pctx->gtp_version) { | |
983 | case GTP_V0: | |
984 | netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n", | |
985 | pctx->u.v0.tid, &pctx->sgsn_addr_ip4, | |
986 | &pctx->ms_addr_ip4, pctx); | |
987 | break; | |
988 | case GTP_V1: | |
989 | netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n", | |
990 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, | |
991 | &pctx->sgsn_addr_ip4, &pctx->ms_addr_ip4, pctx); | |
992 | break; | |
993 | } | |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
998 | static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) | |
999 | { | |
1000 | struct net_device *dev; | |
1001 | struct net *net; | |
1002 | ||
1003 | if (!info->attrs[GTPA_VERSION] || | |
1004 | !info->attrs[GTPA_LINK] || | |
1005 | !info->attrs[GTPA_SGSN_ADDRESS] || | |
1006 | !info->attrs[GTPA_MS_ADDRESS]) | |
1007 | return -EINVAL; | |
1008 | ||
1009 | switch (nla_get_u32(info->attrs[GTPA_VERSION])) { | |
1010 | case GTP_V0: | |
1011 | if (!info->attrs[GTPA_TID] || | |
1012 | !info->attrs[GTPA_FLOW]) | |
1013 | return -EINVAL; | |
1014 | break; | |
1015 | case GTP_V1: | |
1016 | if (!info->attrs[GTPA_I_TEI] || | |
1017 | !info->attrs[GTPA_O_TEI]) | |
1018 | return -EINVAL; | |
1019 | break; | |
1020 | ||
1021 | default: | |
1022 | return -EINVAL; | |
1023 | } | |
1024 | ||
1025 | net = gtp_genl_get_net(sock_net(skb->sk), info->attrs); | |
1026 | if (IS_ERR(net)) | |
1027 | return PTR_ERR(net); | |
1028 | ||
1029 | /* Check if there's an existing gtpX device to configure */ | |
1030 | dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK])); | |
27ee441a PN |
1031 | if (dev == NULL) { |
1032 | put_net(net); | |
459aa660 | 1033 | return -ENODEV; |
27ee441a PN |
1034 | } |
1035 | put_net(net); | |
459aa660 PN |
1036 | |
1037 | return ipv4_pdp_add(dev, info); | |
1038 | } | |
1039 | ||
1040 | static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) | |
1041 | { | |
1042 | struct net_device *dev; | |
1043 | struct pdp_ctx *pctx; | |
1044 | struct gtp_dev *gtp; | |
1045 | struct net *net; | |
1046 | ||
1047 | if (!info->attrs[GTPA_VERSION] || | |
1048 | !info->attrs[GTPA_LINK]) | |
1049 | return -EINVAL; | |
1050 | ||
1051 | net = gtp_genl_get_net(sock_net(skb->sk), info->attrs); | |
1052 | if (IS_ERR(net)) | |
1053 | return PTR_ERR(net); | |
1054 | ||
1055 | /* Check if there's an existing gtpX device to configure */ | |
1056 | dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK])); | |
27ee441a PN |
1057 | if (dev == NULL) { |
1058 | put_net(net); | |
459aa660 | 1059 | return -ENODEV; |
27ee441a PN |
1060 | } |
1061 | put_net(net); | |
459aa660 PN |
1062 | |
1063 | gtp = netdev_priv(dev); | |
1064 | ||
1065 | switch (nla_get_u32(info->attrs[GTPA_VERSION])) { | |
1066 | case GTP_V0: | |
1067 | if (!info->attrs[GTPA_TID]) | |
1068 | return -EINVAL; | |
1069 | pctx = gtp0_pdp_find(gtp, nla_get_u64(info->attrs[GTPA_TID])); | |
1070 | break; | |
1071 | case GTP_V1: | |
1072 | if (!info->attrs[GTPA_I_TEI]) | |
1073 | return -EINVAL; | |
1074 | pctx = gtp1_pdp_find(gtp, nla_get_u64(info->attrs[GTPA_I_TEI])); | |
1075 | break; | |
1076 | ||
1077 | default: | |
1078 | return -EINVAL; | |
1079 | } | |
1080 | ||
1081 | if (pctx == NULL) | |
1082 | return -ENOENT; | |
1083 | ||
1084 | if (pctx->gtp_version == GTP_V0) | |
1085 | netdev_dbg(dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n", | |
1086 | pctx->u.v0.tid, pctx); | |
1087 | else if (pctx->gtp_version == GTP_V1) | |
1088 | netdev_dbg(dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n", | |
1089 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); | |
1090 | ||
1091 | hlist_del_rcu(&pctx->hlist_tid); | |
1092 | hlist_del_rcu(&pctx->hlist_addr); | |
1093 | kfree_rcu(pctx, rcu_head); | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | static struct genl_family gtp_genl_family = { | |
1099 | .id = GENL_ID_GENERATE, | |
1100 | .name = "gtp", | |
1101 | .version = 0, | |
1102 | .hdrsize = 0, | |
1103 | .maxattr = GTPA_MAX, | |
1104 | .netnsok = true, | |
1105 | }; | |
1106 | ||
1107 | static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, | |
1108 | u32 type, struct pdp_ctx *pctx) | |
1109 | { | |
1110 | void *genlh; | |
1111 | ||
1112 | genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, 0, | |
1113 | type); | |
1114 | if (genlh == NULL) | |
1115 | goto nlmsg_failure; | |
1116 | ||
1117 | if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) || | |
1118 | nla_put_be32(skb, GTPA_SGSN_ADDRESS, pctx->sgsn_addr_ip4.s_addr) || | |
1119 | nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr)) | |
1120 | goto nla_put_failure; | |
1121 | ||
1122 | switch (pctx->gtp_version) { | |
1123 | case GTP_V0: | |
1124 | if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) || | |
1125 | nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow)) | |
1126 | goto nla_put_failure; | |
1127 | break; | |
1128 | case GTP_V1: | |
1129 | if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) || | |
1130 | nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei)) | |
1131 | goto nla_put_failure; | |
1132 | break; | |
1133 | } | |
1134 | genlmsg_end(skb, genlh); | |
1135 | return 0; | |
1136 | ||
1137 | nlmsg_failure: | |
1138 | nla_put_failure: | |
1139 | genlmsg_cancel(skb, genlh); | |
1140 | return -EMSGSIZE; | |
1141 | } | |
1142 | ||
1143 | static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) | |
1144 | { | |
1145 | struct pdp_ctx *pctx = NULL; | |
1146 | struct net_device *dev; | |
1147 | struct sk_buff *skb2; | |
1148 | struct gtp_dev *gtp; | |
1149 | u32 gtp_version; | |
1150 | struct net *net; | |
1151 | int err; | |
1152 | ||
1153 | if (!info->attrs[GTPA_VERSION] || | |
1154 | !info->attrs[GTPA_LINK]) | |
1155 | return -EINVAL; | |
1156 | ||
1157 | gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); | |
1158 | switch (gtp_version) { | |
1159 | case GTP_V0: | |
1160 | case GTP_V1: | |
1161 | break; | |
1162 | default: | |
1163 | return -EINVAL; | |
1164 | } | |
1165 | ||
1166 | net = gtp_genl_get_net(sock_net(skb->sk), info->attrs); | |
1167 | if (IS_ERR(net)) | |
1168 | return PTR_ERR(net); | |
1169 | ||
1170 | /* Check if there's an existing gtpX device to configure */ | |
1171 | dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK])); | |
27ee441a PN |
1172 | if (dev == NULL) { |
1173 | put_net(net); | |
459aa660 | 1174 | return -ENODEV; |
27ee441a PN |
1175 | } |
1176 | put_net(net); | |
459aa660 PN |
1177 | |
1178 | gtp = netdev_priv(dev); | |
1179 | ||
1180 | rcu_read_lock(); | |
1181 | if (gtp_version == GTP_V0 && | |
1182 | info->attrs[GTPA_TID]) { | |
1183 | u64 tid = nla_get_u64(info->attrs[GTPA_TID]); | |
1184 | ||
1185 | pctx = gtp0_pdp_find(gtp, tid); | |
1186 | } else if (gtp_version == GTP_V1 && | |
1187 | info->attrs[GTPA_I_TEI]) { | |
1188 | u32 tid = nla_get_u32(info->attrs[GTPA_I_TEI]); | |
1189 | ||
1190 | pctx = gtp1_pdp_find(gtp, tid); | |
1191 | } else if (info->attrs[GTPA_MS_ADDRESS]) { | |
1192 | __be32 ip = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
1193 | ||
1194 | pctx = ipv4_pdp_find(gtp, ip); | |
1195 | } | |
1196 | ||
1197 | if (pctx == NULL) { | |
1198 | err = -ENOENT; | |
1199 | goto err_unlock; | |
1200 | } | |
1201 | ||
1202 | skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); | |
1203 | if (skb2 == NULL) { | |
1204 | err = -ENOMEM; | |
1205 | goto err_unlock; | |
1206 | } | |
1207 | ||
1208 | err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, | |
1209 | info->snd_seq, info->nlhdr->nlmsg_type, pctx); | |
1210 | if (err < 0) | |
1211 | goto err_unlock_free; | |
1212 | ||
1213 | rcu_read_unlock(); | |
1214 | return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid); | |
1215 | ||
1216 | err_unlock_free: | |
1217 | kfree_skb(skb2); | |
1218 | err_unlock: | |
1219 | rcu_read_unlock(); | |
1220 | return err; | |
1221 | } | |
1222 | ||
1223 | static int gtp_genl_dump_pdp(struct sk_buff *skb, | |
1224 | struct netlink_callback *cb) | |
1225 | { | |
1226 | struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp; | |
1227 | struct net *net = sock_net(skb->sk); | |
1228 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1229 | unsigned long tid = cb->args[1]; | |
1230 | int i, k = cb->args[0], ret; | |
1231 | struct pdp_ctx *pctx; | |
1232 | ||
1233 | if (cb->args[4]) | |
1234 | return 0; | |
1235 | ||
1236 | list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { | |
1237 | if (last_gtp && last_gtp != gtp) | |
1238 | continue; | |
1239 | else | |
1240 | last_gtp = NULL; | |
1241 | ||
1242 | for (i = k; i < gtp->hash_size; i++) { | |
1243 | hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) { | |
1244 | if (tid && tid != pctx->u.tid) | |
1245 | continue; | |
1246 | else | |
1247 | tid = 0; | |
1248 | ||
1249 | ret = gtp_genl_fill_info(skb, | |
1250 | NETLINK_CB(cb->skb).portid, | |
1251 | cb->nlh->nlmsg_seq, | |
1252 | cb->nlh->nlmsg_type, pctx); | |
1253 | if (ret < 0) { | |
1254 | cb->args[0] = i; | |
1255 | cb->args[1] = pctx->u.tid; | |
1256 | cb->args[2] = (unsigned long)gtp; | |
1257 | goto out; | |
1258 | } | |
1259 | } | |
1260 | } | |
1261 | } | |
1262 | cb->args[4] = 1; | |
1263 | out: | |
1264 | return skb->len; | |
1265 | } | |
1266 | ||
1267 | static struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = { | |
1268 | [GTPA_LINK] = { .type = NLA_U32, }, | |
1269 | [GTPA_VERSION] = { .type = NLA_U32, }, | |
1270 | [GTPA_TID] = { .type = NLA_U64, }, | |
1271 | [GTPA_SGSN_ADDRESS] = { .type = NLA_U32, }, | |
1272 | [GTPA_MS_ADDRESS] = { .type = NLA_U32, }, | |
1273 | [GTPA_FLOW] = { .type = NLA_U16, }, | |
1274 | [GTPA_NET_NS_FD] = { .type = NLA_U32, }, | |
1275 | [GTPA_I_TEI] = { .type = NLA_U32, }, | |
1276 | [GTPA_O_TEI] = { .type = NLA_U32, }, | |
1277 | }; | |
1278 | ||
1279 | static const struct genl_ops gtp_genl_ops[] = { | |
1280 | { | |
1281 | .cmd = GTP_CMD_NEWPDP, | |
1282 | .doit = gtp_genl_new_pdp, | |
1283 | .policy = gtp_genl_policy, | |
1284 | .flags = GENL_ADMIN_PERM, | |
1285 | }, | |
1286 | { | |
1287 | .cmd = GTP_CMD_DELPDP, | |
1288 | .doit = gtp_genl_del_pdp, | |
1289 | .policy = gtp_genl_policy, | |
1290 | .flags = GENL_ADMIN_PERM, | |
1291 | }, | |
1292 | { | |
1293 | .cmd = GTP_CMD_GETPDP, | |
1294 | .doit = gtp_genl_get_pdp, | |
1295 | .dumpit = gtp_genl_dump_pdp, | |
1296 | .policy = gtp_genl_policy, | |
1297 | .flags = GENL_ADMIN_PERM, | |
1298 | }, | |
1299 | }; | |
1300 | ||
1301 | static int __net_init gtp_net_init(struct net *net) | |
1302 | { | |
1303 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1304 | ||
1305 | INIT_LIST_HEAD(&gn->gtp_dev_list); | |
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | static void __net_exit gtp_net_exit(struct net *net) | |
1310 | { | |
1311 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1312 | struct gtp_dev *gtp; | |
1313 | LIST_HEAD(list); | |
1314 | ||
1315 | rtnl_lock(); | |
1316 | list_for_each_entry(gtp, &gn->gtp_dev_list, list) | |
1317 | gtp_dellink(gtp->dev, &list); | |
1318 | ||
1319 | unregister_netdevice_many(&list); | |
1320 | rtnl_unlock(); | |
1321 | } | |
1322 | ||
1323 | static struct pernet_operations gtp_net_ops = { | |
1324 | .init = gtp_net_init, | |
1325 | .exit = gtp_net_exit, | |
1326 | .id = >p_net_id, | |
1327 | .size = sizeof(struct gtp_net), | |
1328 | }; | |
1329 | ||
1330 | static int __init gtp_init(void) | |
1331 | { | |
1332 | int err; | |
1333 | ||
1334 | get_random_bytes(>p_h_initval, sizeof(gtp_h_initval)); | |
1335 | ||
1336 | err = rtnl_link_register(>p_link_ops); | |
1337 | if (err < 0) | |
1338 | goto error_out; | |
1339 | ||
1340 | err = genl_register_family_with_ops(>p_genl_family, gtp_genl_ops); | |
1341 | if (err < 0) | |
1342 | goto unreg_rtnl_link; | |
1343 | ||
1344 | err = register_pernet_subsys(>p_net_ops); | |
1345 | if (err < 0) | |
1346 | goto unreg_genl_family; | |
1347 | ||
1348 | pr_info("GTP module loaded (pdp ctx size %Zd bytes)\n", | |
1349 | sizeof(struct pdp_ctx)); | |
1350 | return 0; | |
1351 | ||
1352 | unreg_genl_family: | |
1353 | genl_unregister_family(>p_genl_family); | |
1354 | unreg_rtnl_link: | |
1355 | rtnl_link_unregister(>p_link_ops); | |
1356 | error_out: | |
1357 | pr_err("error loading GTP module loaded\n"); | |
1358 | return err; | |
1359 | } | |
1360 | late_initcall(gtp_init); | |
1361 | ||
1362 | static void __exit gtp_fini(void) | |
1363 | { | |
1364 | unregister_pernet_subsys(>p_net_ops); | |
1365 | genl_unregister_family(>p_genl_family); | |
1366 | rtnl_link_unregister(>p_link_ops); | |
1367 | ||
1368 | pr_info("GTP module unloaded\n"); | |
1369 | } | |
1370 | module_exit(gtp_fini); | |
1371 | ||
1372 | MODULE_LICENSE("GPL"); | |
1373 | MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>"); | |
1374 | MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic"); | |
1375 | MODULE_ALIAS_RTNL_LINK("gtp"); |