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Commit | Line | Data |
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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. */ | |
40 | struct pdp_ctx { | |
41 | struct hlist_node hlist_tid; | |
42 | struct hlist_node hlist_addr; | |
43 | ||
44 | union { | |
45 | u64 tid; | |
46 | struct { | |
47 | u64 tid; | |
48 | u16 flow; | |
49 | } v0; | |
50 | struct { | |
51 | u32 i_tei; | |
52 | u32 o_tei; | |
53 | } v1; | |
54 | } u; | |
55 | u8 gtp_version; | |
56 | u16 af; | |
57 | ||
58 | struct in_addr ms_addr_ip4; | |
59 | struct in_addr sgsn_addr_ip4; | |
60 | ||
61 | atomic_t tx_seq; | |
62 | struct rcu_head rcu_head; | |
63 | }; | |
64 | ||
65 | /* One instance of the GTP device. */ | |
66 | struct gtp_dev { | |
67 | struct list_head list; | |
68 | ||
69 | struct socket *sock0; | |
70 | struct socket *sock1u; | |
71 | ||
459aa660 PN |
72 | struct net_device *dev; |
73 | ||
74 | unsigned int hash_size; | |
75 | struct hlist_head *tid_hash; | |
76 | struct hlist_head *addr_hash; | |
77 | }; | |
78 | ||
c7d03a00 | 79 | static unsigned int gtp_net_id __read_mostly; |
459aa660 PN |
80 | |
81 | struct gtp_net { | |
82 | struct list_head gtp_dev_list; | |
83 | }; | |
84 | ||
85 | static u32 gtp_h_initval; | |
86 | ||
87 | static inline u32 gtp0_hashfn(u64 tid) | |
88 | { | |
89 | u32 *tid32 = (u32 *) &tid; | |
90 | return jhash_2words(tid32[0], tid32[1], gtp_h_initval); | |
91 | } | |
92 | ||
93 | static inline u32 gtp1u_hashfn(u32 tid) | |
94 | { | |
95 | return jhash_1word(tid, gtp_h_initval); | |
96 | } | |
97 | ||
98 | static inline u32 ipv4_hashfn(__be32 ip) | |
99 | { | |
100 | return jhash_1word((__force u32)ip, gtp_h_initval); | |
101 | } | |
102 | ||
103 | /* Resolve a PDP context structure based on the 64bit TID. */ | |
104 | static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid) | |
105 | { | |
106 | struct hlist_head *head; | |
107 | struct pdp_ctx *pdp; | |
108 | ||
109 | head = >p->tid_hash[gtp0_hashfn(tid) % gtp->hash_size]; | |
110 | ||
111 | hlist_for_each_entry_rcu(pdp, head, hlist_tid) { | |
112 | if (pdp->gtp_version == GTP_V0 && | |
113 | pdp->u.v0.tid == tid) | |
114 | return pdp; | |
115 | } | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | /* Resolve a PDP context structure based on the 32bit TEI. */ | |
120 | static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid) | |
121 | { | |
122 | struct hlist_head *head; | |
123 | struct pdp_ctx *pdp; | |
124 | ||
125 | head = >p->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size]; | |
126 | ||
127 | hlist_for_each_entry_rcu(pdp, head, hlist_tid) { | |
128 | if (pdp->gtp_version == GTP_V1 && | |
129 | pdp->u.v1.i_tei == tid) | |
130 | return pdp; | |
131 | } | |
132 | return NULL; | |
133 | } | |
134 | ||
135 | /* Resolve a PDP context based on IPv4 address of MS. */ | |
136 | static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr) | |
137 | { | |
138 | struct hlist_head *head; | |
139 | struct pdp_ctx *pdp; | |
140 | ||
141 | head = >p->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size]; | |
142 | ||
143 | hlist_for_each_entry_rcu(pdp, head, hlist_addr) { | |
144 | if (pdp->af == AF_INET && | |
145 | pdp->ms_addr_ip4.s_addr == ms_addr) | |
146 | return pdp; | |
147 | } | |
148 | ||
149 | return NULL; | |
150 | } | |
151 | ||
152 | static bool gtp_check_src_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx, | |
153 | unsigned int hdrlen) | |
154 | { | |
155 | struct iphdr *iph; | |
156 | ||
157 | if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr))) | |
158 | return false; | |
159 | ||
88edf103 | 160 | iph = (struct iphdr *)(skb->data + hdrlen); |
459aa660 | 161 | |
88edf103 | 162 | return iph->saddr == pctx->ms_addr_ip4.s_addr; |
459aa660 PN |
163 | } |
164 | ||
165 | /* Check if the inner IP source address in this packet is assigned to any | |
166 | * existing mobile subscriber. | |
167 | */ | |
168 | static bool gtp_check_src_ms(struct sk_buff *skb, struct pdp_ctx *pctx, | |
169 | unsigned int hdrlen) | |
170 | { | |
171 | switch (ntohs(skb->protocol)) { | |
172 | case ETH_P_IP: | |
173 | return gtp_check_src_ms_ipv4(skb, pctx, hdrlen); | |
174 | } | |
175 | return false; | |
176 | } | |
177 | ||
178 | /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */ | |
179 | static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, | |
180 | bool xnet) | |
181 | { | |
182 | unsigned int hdrlen = sizeof(struct udphdr) + | |
183 | sizeof(struct gtp0_header); | |
184 | struct gtp0_header *gtp0; | |
185 | struct pdp_ctx *pctx; | |
459aa660 PN |
186 | |
187 | if (!pskb_may_pull(skb, hdrlen)) | |
188 | return -1; | |
189 | ||
190 | gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); | |
191 | ||
192 | if ((gtp0->flags >> 5) != GTP_V0) | |
193 | return 1; | |
194 | ||
195 | if (gtp0->type != GTP_TPDU) | |
196 | return 1; | |
197 | ||
459aa660 PN |
198 | pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid)); |
199 | if (!pctx) { | |
200 | netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); | |
1796a81d | 201 | return 1; |
459aa660 PN |
202 | } |
203 | ||
204 | if (!gtp_check_src_ms(skb, pctx, hdrlen)) { | |
205 | netdev_dbg(gtp->dev, "No PDP ctx for this MS\n"); | |
1796a81d | 206 | return 1; |
459aa660 | 207 | } |
459aa660 PN |
208 | |
209 | /* Get rid of the GTP + UDP headers. */ | |
210 | return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet); | |
459aa660 PN |
211 | } |
212 | ||
213 | static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, | |
214 | bool xnet) | |
215 | { | |
216 | unsigned int hdrlen = sizeof(struct udphdr) + | |
217 | sizeof(struct gtp1_header); | |
218 | struct gtp1_header *gtp1; | |
219 | struct pdp_ctx *pctx; | |
459aa660 PN |
220 | |
221 | if (!pskb_may_pull(skb, hdrlen)) | |
222 | return -1; | |
223 | ||
224 | gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); | |
225 | ||
226 | if ((gtp1->flags >> 5) != GTP_V1) | |
227 | return 1; | |
228 | ||
229 | if (gtp1->type != GTP_TPDU) | |
230 | return 1; | |
231 | ||
232 | /* From 29.060: "This field shall be present if and only if any one or | |
233 | * more of the S, PN and E flags are set.". | |
234 | * | |
235 | * If any of the bit is set, then the remaining ones also have to be | |
236 | * set. | |
237 | */ | |
238 | if (gtp1->flags & GTP1_F_MASK) | |
239 | hdrlen += 4; | |
240 | ||
241 | /* Make sure the header is larger enough, including extensions. */ | |
242 | if (!pskb_may_pull(skb, hdrlen)) | |
243 | return -1; | |
244 | ||
93edb8c7 PN |
245 | gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); |
246 | ||
459aa660 PN |
247 | pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid)); |
248 | if (!pctx) { | |
249 | netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); | |
1796a81d | 250 | return 1; |
459aa660 PN |
251 | } |
252 | ||
253 | if (!gtp_check_src_ms(skb, pctx, hdrlen)) { | |
254 | netdev_dbg(gtp->dev, "No PDP ctx for this MS\n"); | |
1796a81d | 255 | return 1; |
459aa660 | 256 | } |
459aa660 PN |
257 | |
258 | /* Get rid of the GTP + UDP headers. */ | |
259 | return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet); | |
459aa660 PN |
260 | } |
261 | ||
262 | static void gtp_encap_disable(struct gtp_dev *gtp) | |
263 | { | |
264 | if (gtp->sock0 && gtp->sock0->sk) { | |
265 | udp_sk(gtp->sock0->sk)->encap_type = 0; | |
266 | rcu_assign_sk_user_data(gtp->sock0->sk, NULL); | |
267 | } | |
268 | if (gtp->sock1u && gtp->sock1u->sk) { | |
269 | udp_sk(gtp->sock1u->sk)->encap_type = 0; | |
270 | rcu_assign_sk_user_data(gtp->sock1u->sk, NULL); | |
271 | } | |
272 | ||
273 | gtp->sock0 = NULL; | |
274 | gtp->sock1u = NULL; | |
275 | } | |
276 | ||
277 | static void gtp_encap_destroy(struct sock *sk) | |
278 | { | |
279 | struct gtp_dev *gtp; | |
280 | ||
281 | gtp = rcu_dereference_sk_user_data(sk); | |
282 | if (gtp) | |
283 | gtp_encap_disable(gtp); | |
284 | } | |
285 | ||
286 | /* UDP encapsulation receive handler. See net/ipv4/udp.c. | |
287 | * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket. | |
288 | */ | |
289 | static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
290 | { | |
291 | struct pcpu_sw_netstats *stats; | |
292 | struct gtp_dev *gtp; | |
293 | bool xnet; | |
294 | int ret; | |
295 | ||
296 | gtp = rcu_dereference_sk_user_data(sk); | |
297 | if (!gtp) | |
298 | return 1; | |
299 | ||
300 | netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); | |
301 | ||
3ab1b469 | 302 | xnet = !net_eq(sock_net(sk), dev_net(gtp->dev)); |
459aa660 PN |
303 | |
304 | switch (udp_sk(sk)->encap_type) { | |
305 | case UDP_ENCAP_GTP0: | |
306 | netdev_dbg(gtp->dev, "received GTP0 packet\n"); | |
307 | ret = gtp0_udp_encap_recv(gtp, skb, xnet); | |
308 | break; | |
309 | case UDP_ENCAP_GTP1U: | |
310 | netdev_dbg(gtp->dev, "received GTP1U packet\n"); | |
311 | ret = gtp1u_udp_encap_recv(gtp, skb, xnet); | |
312 | break; | |
313 | default: | |
314 | ret = -1; /* Shouldn't happen. */ | |
315 | } | |
316 | ||
317 | switch (ret) { | |
318 | case 1: | |
319 | netdev_dbg(gtp->dev, "pass up to the process\n"); | |
320 | return 1; | |
321 | case 0: | |
322 | netdev_dbg(gtp->dev, "forwarding packet from GGSN to uplink\n"); | |
323 | break; | |
324 | case -1: | |
325 | netdev_dbg(gtp->dev, "GTP packet has been dropped\n"); | |
326 | kfree_skb(skb); | |
327 | return 0; | |
328 | } | |
329 | ||
330 | /* Now that the UDP and the GTP header have been removed, set up the | |
331 | * new network header. This is required by the upper layer to | |
332 | * calculate the transport header. | |
333 | */ | |
334 | skb_reset_network_header(skb); | |
335 | ||
336 | skb->dev = gtp->dev; | |
337 | ||
338 | stats = this_cpu_ptr(gtp->dev->tstats); | |
339 | u64_stats_update_begin(&stats->syncp); | |
340 | stats->rx_packets++; | |
341 | stats->rx_bytes += skb->len; | |
342 | u64_stats_update_end(&stats->syncp); | |
343 | ||
344 | netif_rx(skb); | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | static int gtp_dev_init(struct net_device *dev) | |
350 | { | |
351 | struct gtp_dev *gtp = netdev_priv(dev); | |
352 | ||
353 | gtp->dev = dev; | |
354 | ||
355 | dev->tstats = alloc_percpu(struct pcpu_sw_netstats); | |
356 | if (!dev->tstats) | |
357 | return -ENOMEM; | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static void gtp_dev_uninit(struct net_device *dev) | |
363 | { | |
364 | struct gtp_dev *gtp = netdev_priv(dev); | |
365 | ||
366 | gtp_encap_disable(gtp); | |
367 | free_percpu(dev->tstats); | |
368 | } | |
369 | ||
370 | static struct rtable *ip4_route_output_gtp(struct net *net, struct flowi4 *fl4, | |
371 | const struct sock *sk, __be32 daddr) | |
372 | { | |
373 | memset(fl4, 0, sizeof(*fl4)); | |
374 | fl4->flowi4_oif = sk->sk_bound_dev_if; | |
375 | fl4->daddr = daddr; | |
376 | fl4->saddr = inet_sk(sk)->inet_saddr; | |
377 | fl4->flowi4_tos = RT_CONN_FLAGS(sk); | |
378 | fl4->flowi4_proto = sk->sk_protocol; | |
379 | ||
380 | return ip_route_output_key(net, fl4); | |
381 | } | |
382 | ||
383 | static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) | |
384 | { | |
385 | int payload_len = skb->len; | |
386 | struct gtp0_header *gtp0; | |
387 | ||
388 | gtp0 = (struct gtp0_header *) skb_push(skb, sizeof(*gtp0)); | |
389 | ||
390 | gtp0->flags = 0x1e; /* v0, GTP-non-prime. */ | |
391 | gtp0->type = GTP_TPDU; | |
392 | gtp0->length = htons(payload_len); | |
393 | gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff); | |
394 | gtp0->flow = htons(pctx->u.v0.flow); | |
395 | gtp0->number = 0xff; | |
396 | gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff; | |
397 | gtp0->tid = cpu_to_be64(pctx->u.v0.tid); | |
398 | } | |
399 | ||
400 | static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) | |
401 | { | |
402 | int payload_len = skb->len; | |
403 | struct gtp1_header *gtp1; | |
404 | ||
405 | gtp1 = (struct gtp1_header *) skb_push(skb, sizeof(*gtp1)); | |
406 | ||
407 | /* Bits 8 7 6 5 4 3 2 1 | |
408 | * +--+--+--+--+--+--+--+--+ | |
d928be81 | 409 | * |version |PT| 0| E| S|PN| |
459aa660 PN |
410 | * +--+--+--+--+--+--+--+--+ |
411 | * 0 0 1 1 1 0 0 0 | |
412 | */ | |
d928be81 | 413 | gtp1->flags = 0x30; /* v1, GTP-non-prime. */ |
459aa660 PN |
414 | gtp1->type = GTP_TPDU; |
415 | gtp1->length = htons(payload_len); | |
416 | gtp1->tid = htonl(pctx->u.v1.o_tei); | |
417 | ||
418 | /* TODO: Suppport for extension header, sequence number and N-PDU. | |
419 | * Update the length field if any of them is available. | |
420 | */ | |
421 | } | |
422 | ||
423 | struct gtp_pktinfo { | |
424 | struct sock *sk; | |
425 | struct iphdr *iph; | |
426 | struct flowi4 fl4; | |
427 | struct rtable *rt; | |
428 | struct pdp_ctx *pctx; | |
429 | struct net_device *dev; | |
430 | __be16 gtph_port; | |
431 | }; | |
432 | ||
433 | static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo) | |
434 | { | |
435 | switch (pktinfo->pctx->gtp_version) { | |
436 | case GTP_V0: | |
437 | pktinfo->gtph_port = htons(GTP0_PORT); | |
438 | gtp0_push_header(skb, pktinfo->pctx); | |
439 | break; | |
440 | case GTP_V1: | |
441 | pktinfo->gtph_port = htons(GTP1U_PORT); | |
442 | gtp1_push_header(skb, pktinfo->pctx); | |
443 | break; | |
444 | } | |
445 | } | |
446 | ||
447 | static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, | |
448 | struct sock *sk, struct iphdr *iph, | |
449 | struct pdp_ctx *pctx, struct rtable *rt, | |
450 | struct flowi4 *fl4, | |
451 | struct net_device *dev) | |
452 | { | |
453 | pktinfo->sk = sk; | |
454 | pktinfo->iph = iph; | |
455 | pktinfo->pctx = pctx; | |
456 | pktinfo->rt = rt; | |
457 | pktinfo->fl4 = *fl4; | |
458 | pktinfo->dev = dev; | |
459 | } | |
460 | ||
461 | static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, | |
462 | struct gtp_pktinfo *pktinfo) | |
463 | { | |
464 | struct gtp_dev *gtp = netdev_priv(dev); | |
465 | struct pdp_ctx *pctx; | |
466 | struct rtable *rt; | |
467 | struct flowi4 fl4; | |
468 | struct iphdr *iph; | |
469 | struct sock *sk; | |
470 | __be16 df; | |
471 | int mtu; | |
472 | ||
473 | /* Read the IP destination address and resolve the PDP context. | |
474 | * Prepend PDP header with TEI/TID from PDP ctx. | |
475 | */ | |
476 | iph = ip_hdr(skb); | |
477 | pctx = ipv4_pdp_find(gtp, iph->daddr); | |
478 | if (!pctx) { | |
479 | netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", | |
480 | &iph->daddr); | |
481 | return -ENOENT; | |
482 | } | |
483 | netdev_dbg(dev, "found PDP context %p\n", pctx); | |
484 | ||
485 | switch (pctx->gtp_version) { | |
486 | case GTP_V0: | |
487 | if (gtp->sock0) | |
488 | sk = gtp->sock0->sk; | |
489 | else | |
490 | sk = NULL; | |
491 | break; | |
492 | case GTP_V1: | |
493 | if (gtp->sock1u) | |
494 | sk = gtp->sock1u->sk; | |
495 | else | |
496 | sk = NULL; | |
497 | break; | |
498 | default: | |
499 | return -ENOENT; | |
500 | } | |
501 | ||
502 | if (!sk) { | |
503 | netdev_dbg(dev, "no userspace socket is available, skip\n"); | |
504 | return -ENOENT; | |
505 | } | |
506 | ||
507 | rt = ip4_route_output_gtp(sock_net(sk), &fl4, gtp->sock0->sk, | |
508 | pctx->sgsn_addr_ip4.s_addr); | |
509 | if (IS_ERR(rt)) { | |
510 | netdev_dbg(dev, "no route to SSGN %pI4\n", | |
511 | &pctx->sgsn_addr_ip4.s_addr); | |
512 | dev->stats.tx_carrier_errors++; | |
513 | goto err; | |
514 | } | |
515 | ||
516 | if (rt->dst.dev == dev) { | |
517 | netdev_dbg(dev, "circular route to SSGN %pI4\n", | |
518 | &pctx->sgsn_addr_ip4.s_addr); | |
519 | dev->stats.collisions++; | |
520 | goto err_rt; | |
521 | } | |
522 | ||
523 | skb_dst_drop(skb); | |
524 | ||
525 | /* This is similar to tnl_update_pmtu(). */ | |
526 | df = iph->frag_off; | |
527 | if (df) { | |
528 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - | |
529 | sizeof(struct iphdr) - sizeof(struct udphdr); | |
530 | switch (pctx->gtp_version) { | |
531 | case GTP_V0: | |
532 | mtu -= sizeof(struct gtp0_header); | |
533 | break; | |
534 | case GTP_V1: | |
535 | mtu -= sizeof(struct gtp1_header); | |
536 | break; | |
537 | } | |
538 | } else { | |
539 | mtu = dst_mtu(&rt->dst); | |
540 | } | |
541 | ||
542 | rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu); | |
543 | ||
544 | if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) && | |
545 | mtu < ntohs(iph->tot_len)) { | |
546 | netdev_dbg(dev, "packet too big, fragmentation needed\n"); | |
547 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
548 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
549 | htonl(mtu)); | |
550 | goto err_rt; | |
551 | } | |
552 | ||
553 | gtp_set_pktinfo_ipv4(pktinfo, sk, iph, pctx, rt, &fl4, dev); | |
554 | gtp_push_header(skb, pktinfo); | |
555 | ||
556 | return 0; | |
557 | err_rt: | |
558 | ip_rt_put(rt); | |
559 | err: | |
560 | return -EBADMSG; | |
561 | } | |
562 | ||
563 | static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) | |
564 | { | |
565 | unsigned int proto = ntohs(skb->protocol); | |
566 | struct gtp_pktinfo pktinfo; | |
567 | int err; | |
568 | ||
569 | /* Ensure there is sufficient headroom. */ | |
570 | if (skb_cow_head(skb, dev->needed_headroom)) | |
571 | goto tx_err; | |
572 | ||
573 | skb_reset_inner_headers(skb); | |
574 | ||
575 | /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */ | |
576 | rcu_read_lock(); | |
577 | switch (proto) { | |
578 | case ETH_P_IP: | |
579 | err = gtp_build_skb_ip4(skb, dev, &pktinfo); | |
580 | break; | |
581 | default: | |
582 | err = -EOPNOTSUPP; | |
583 | break; | |
584 | } | |
585 | rcu_read_unlock(); | |
586 | ||
587 | if (err < 0) | |
588 | goto tx_err; | |
589 | ||
590 | switch (proto) { | |
591 | case ETH_P_IP: | |
592 | netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n", | |
593 | &pktinfo.iph->saddr, &pktinfo.iph->daddr); | |
594 | udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, | |
595 | pktinfo.fl4.saddr, pktinfo.fl4.daddr, | |
596 | pktinfo.iph->tos, | |
597 | ip4_dst_hoplimit(&pktinfo.rt->dst), | |
c6ce1d08 | 598 | 0, |
459aa660 PN |
599 | pktinfo.gtph_port, pktinfo.gtph_port, |
600 | true, false); | |
601 | break; | |
602 | } | |
603 | ||
604 | return NETDEV_TX_OK; | |
605 | tx_err: | |
606 | dev->stats.tx_errors++; | |
607 | dev_kfree_skb(skb); | |
608 | return NETDEV_TX_OK; | |
609 | } | |
610 | ||
611 | static const struct net_device_ops gtp_netdev_ops = { | |
612 | .ndo_init = gtp_dev_init, | |
613 | .ndo_uninit = gtp_dev_uninit, | |
614 | .ndo_start_xmit = gtp_dev_xmit, | |
615 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
616 | }; | |
617 | ||
618 | static void gtp_link_setup(struct net_device *dev) | |
619 | { | |
620 | dev->netdev_ops = >p_netdev_ops; | |
621 | dev->destructor = free_netdev; | |
622 | ||
623 | dev->hard_header_len = 0; | |
624 | dev->addr_len = 0; | |
625 | ||
626 | /* Zero header length. */ | |
627 | dev->type = ARPHRD_NONE; | |
628 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
629 | ||
630 | dev->priv_flags |= IFF_NO_QUEUE; | |
631 | dev->features |= NETIF_F_LLTX; | |
632 | netif_keep_dst(dev); | |
633 | ||
634 | /* Assume largest header, ie. GTPv0. */ | |
635 | dev->needed_headroom = LL_MAX_HEADER + | |
636 | sizeof(struct iphdr) + | |
637 | sizeof(struct udphdr) + | |
638 | sizeof(struct gtp0_header); | |
639 | } | |
640 | ||
641 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); | |
642 | static void gtp_hashtable_free(struct gtp_dev *gtp); | |
643 | static int gtp_encap_enable(struct net_device *dev, struct gtp_dev *gtp, | |
3ab1b469 | 644 | int fd_gtp0, int fd_gtp1); |
459aa660 PN |
645 | |
646 | static int gtp_newlink(struct net *src_net, struct net_device *dev, | |
647 | struct nlattr *tb[], struct nlattr *data[]) | |
648 | { | |
649 | int hashsize, err, fd0, fd1; | |
650 | struct gtp_dev *gtp; | |
651 | struct gtp_net *gn; | |
652 | ||
653 | if (!data[IFLA_GTP_FD0] || !data[IFLA_GTP_FD1]) | |
654 | return -EINVAL; | |
655 | ||
656 | gtp = netdev_priv(dev); | |
657 | ||
658 | fd0 = nla_get_u32(data[IFLA_GTP_FD0]); | |
659 | fd1 = nla_get_u32(data[IFLA_GTP_FD1]); | |
660 | ||
3ab1b469 | 661 | err = gtp_encap_enable(dev, gtp, fd0, fd1); |
459aa660 PN |
662 | if (err < 0) |
663 | goto out_err; | |
664 | ||
665 | if (!data[IFLA_GTP_PDP_HASHSIZE]) | |
666 | hashsize = 1024; | |
667 | else | |
668 | hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]); | |
669 | ||
670 | err = gtp_hashtable_new(gtp, hashsize); | |
671 | if (err < 0) | |
672 | goto out_encap; | |
673 | ||
674 | err = register_netdevice(dev); | |
675 | if (err < 0) { | |
676 | netdev_dbg(dev, "failed to register new netdev %d\n", err); | |
677 | goto out_hashtable; | |
678 | } | |
679 | ||
680 | gn = net_generic(dev_net(dev), gtp_net_id); | |
681 | list_add_rcu(>p->list, &gn->gtp_dev_list); | |
682 | ||
683 | netdev_dbg(dev, "registered new GTP interface\n"); | |
684 | ||
685 | return 0; | |
686 | ||
687 | out_hashtable: | |
688 | gtp_hashtable_free(gtp); | |
689 | out_encap: | |
690 | gtp_encap_disable(gtp); | |
691 | out_err: | |
692 | return err; | |
693 | } | |
694 | ||
695 | static void gtp_dellink(struct net_device *dev, struct list_head *head) | |
696 | { | |
697 | struct gtp_dev *gtp = netdev_priv(dev); | |
698 | ||
699 | gtp_encap_disable(gtp); | |
700 | gtp_hashtable_free(gtp); | |
701 | list_del_rcu(>p->list); | |
702 | unregister_netdevice_queue(dev, head); | |
703 | } | |
704 | ||
705 | static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = { | |
706 | [IFLA_GTP_FD0] = { .type = NLA_U32 }, | |
707 | [IFLA_GTP_FD1] = { .type = NLA_U32 }, | |
708 | [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 }, | |
709 | }; | |
710 | ||
711 | static int gtp_validate(struct nlattr *tb[], struct nlattr *data[]) | |
712 | { | |
713 | if (!data) | |
714 | return -EINVAL; | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | static size_t gtp_get_size(const struct net_device *dev) | |
720 | { | |
721 | return nla_total_size(sizeof(__u32)); /* IFLA_GTP_PDP_HASHSIZE */ | |
722 | } | |
723 | ||
724 | static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
725 | { | |
726 | struct gtp_dev *gtp = netdev_priv(dev); | |
727 | ||
728 | if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size)) | |
729 | goto nla_put_failure; | |
730 | ||
731 | return 0; | |
732 | ||
733 | nla_put_failure: | |
734 | return -EMSGSIZE; | |
735 | } | |
736 | ||
737 | static struct rtnl_link_ops gtp_link_ops __read_mostly = { | |
738 | .kind = "gtp", | |
739 | .maxtype = IFLA_GTP_MAX, | |
740 | .policy = gtp_policy, | |
741 | .priv_size = sizeof(struct gtp_dev), | |
742 | .setup = gtp_link_setup, | |
743 | .validate = gtp_validate, | |
744 | .newlink = gtp_newlink, | |
745 | .dellink = gtp_dellink, | |
746 | .get_size = gtp_get_size, | |
747 | .fill_info = gtp_fill_info, | |
748 | }; | |
749 | ||
750 | static struct net *gtp_genl_get_net(struct net *src_net, struct nlattr *tb[]) | |
751 | { | |
752 | struct net *net; | |
753 | ||
754 | /* Examine the link attributes and figure out which network namespace | |
755 | * we are talking about. | |
756 | */ | |
757 | if (tb[GTPA_NET_NS_FD]) | |
758 | net = get_net_ns_by_fd(nla_get_u32(tb[GTPA_NET_NS_FD])); | |
759 | else | |
760 | net = get_net(src_net); | |
761 | ||
762 | return net; | |
763 | } | |
764 | ||
765 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) | |
766 | { | |
767 | int i; | |
768 | ||
769 | gtp->addr_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL); | |
770 | if (gtp->addr_hash == NULL) | |
771 | return -ENOMEM; | |
772 | ||
773 | gtp->tid_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL); | |
774 | if (gtp->tid_hash == NULL) | |
775 | goto err1; | |
776 | ||
777 | gtp->hash_size = hsize; | |
778 | ||
779 | for (i = 0; i < hsize; i++) { | |
780 | INIT_HLIST_HEAD(>p->addr_hash[i]); | |
781 | INIT_HLIST_HEAD(>p->tid_hash[i]); | |
782 | } | |
783 | return 0; | |
784 | err1: | |
785 | kfree(gtp->addr_hash); | |
786 | return -ENOMEM; | |
787 | } | |
788 | ||
789 | static void gtp_hashtable_free(struct gtp_dev *gtp) | |
790 | { | |
791 | struct pdp_ctx *pctx; | |
792 | int i; | |
793 | ||
794 | for (i = 0; i < gtp->hash_size; i++) { | |
795 | hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) { | |
796 | hlist_del_rcu(&pctx->hlist_tid); | |
797 | hlist_del_rcu(&pctx->hlist_addr); | |
798 | kfree_rcu(pctx, rcu_head); | |
799 | } | |
800 | } | |
801 | synchronize_rcu(); | |
802 | kfree(gtp->addr_hash); | |
803 | kfree(gtp->tid_hash); | |
804 | } | |
805 | ||
806 | static int gtp_encap_enable(struct net_device *dev, struct gtp_dev *gtp, | |
3ab1b469 | 807 | int fd_gtp0, int fd_gtp1) |
459aa660 PN |
808 | { |
809 | struct udp_tunnel_sock_cfg tuncfg = {NULL}; | |
810 | struct socket *sock0, *sock1u; | |
811 | int err; | |
812 | ||
813 | netdev_dbg(dev, "enable gtp on %d, %d\n", fd_gtp0, fd_gtp1); | |
814 | ||
815 | sock0 = sockfd_lookup(fd_gtp0, &err); | |
816 | if (sock0 == NULL) { | |
817 | netdev_dbg(dev, "socket fd=%d not found (gtp0)\n", fd_gtp0); | |
818 | return -ENOENT; | |
819 | } | |
820 | ||
821 | if (sock0->sk->sk_protocol != IPPROTO_UDP) { | |
822 | netdev_dbg(dev, "socket fd=%d not UDP\n", fd_gtp0); | |
823 | err = -EINVAL; | |
824 | goto err1; | |
825 | } | |
826 | ||
827 | sock1u = sockfd_lookup(fd_gtp1, &err); | |
828 | if (sock1u == NULL) { | |
829 | netdev_dbg(dev, "socket fd=%d not found (gtp1u)\n", fd_gtp1); | |
830 | err = -ENOENT; | |
831 | goto err1; | |
832 | } | |
833 | ||
834 | if (sock1u->sk->sk_protocol != IPPROTO_UDP) { | |
835 | netdev_dbg(dev, "socket fd=%d not UDP\n", fd_gtp1); | |
836 | err = -EINVAL; | |
837 | goto err2; | |
838 | } | |
839 | ||
840 | netdev_dbg(dev, "enable gtp on %p, %p\n", sock0, sock1u); | |
841 | ||
842 | gtp->sock0 = sock0; | |
843 | gtp->sock1u = sock1u; | |
459aa660 PN |
844 | |
845 | tuncfg.sk_user_data = gtp; | |
846 | tuncfg.encap_rcv = gtp_encap_recv; | |
847 | tuncfg.encap_destroy = gtp_encap_destroy; | |
848 | ||
849 | tuncfg.encap_type = UDP_ENCAP_GTP0; | |
850 | setup_udp_tunnel_sock(sock_net(gtp->sock0->sk), gtp->sock0, &tuncfg); | |
851 | ||
852 | tuncfg.encap_type = UDP_ENCAP_GTP1U; | |
853 | setup_udp_tunnel_sock(sock_net(gtp->sock1u->sk), gtp->sock1u, &tuncfg); | |
854 | ||
855 | err = 0; | |
856 | err2: | |
857 | sockfd_put(sock1u); | |
858 | err1: | |
859 | sockfd_put(sock0); | |
860 | return err; | |
861 | } | |
862 | ||
863 | static struct net_device *gtp_find_dev(struct net *net, int ifindex) | |
864 | { | |
865 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
866 | struct gtp_dev *gtp; | |
867 | ||
868 | list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { | |
869 | if (ifindex == gtp->dev->ifindex) | |
870 | return gtp->dev; | |
871 | } | |
872 | return NULL; | |
873 | } | |
874 | ||
875 | static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) | |
876 | { | |
877 | pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); | |
878 | pctx->af = AF_INET; | |
879 | pctx->sgsn_addr_ip4.s_addr = | |
880 | nla_get_be32(info->attrs[GTPA_SGSN_ADDRESS]); | |
881 | pctx->ms_addr_ip4.s_addr = | |
882 | nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
883 | ||
884 | switch (pctx->gtp_version) { | |
885 | case GTP_V0: | |
886 | /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow | |
887 | * label needs to be the same for uplink and downlink packets, | |
888 | * so let's annotate this. | |
889 | */ | |
890 | pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]); | |
891 | pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]); | |
892 | break; | |
893 | case GTP_V1: | |
894 | pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]); | |
895 | pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]); | |
896 | break; | |
897 | default: | |
898 | break; | |
899 | } | |
900 | } | |
901 | ||
902 | static int ipv4_pdp_add(struct net_device *dev, struct genl_info *info) | |
903 | { | |
904 | struct gtp_dev *gtp = netdev_priv(dev); | |
905 | u32 hash_ms, hash_tid = 0; | |
906 | struct pdp_ctx *pctx; | |
907 | bool found = false; | |
908 | __be32 ms_addr; | |
909 | ||
910 | ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
911 | hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size; | |
912 | ||
913 | hlist_for_each_entry_rcu(pctx, >p->addr_hash[hash_ms], hlist_addr) { | |
914 | if (pctx->ms_addr_ip4.s_addr == ms_addr) { | |
915 | found = true; | |
916 | break; | |
917 | } | |
918 | } | |
919 | ||
920 | if (found) { | |
921 | if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) | |
922 | return -EEXIST; | |
923 | if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE) | |
924 | return -EOPNOTSUPP; | |
925 | ||
926 | ipv4_pdp_fill(pctx, info); | |
927 | ||
928 | if (pctx->gtp_version == GTP_V0) | |
929 | netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n", | |
930 | pctx->u.v0.tid, pctx); | |
931 | else if (pctx->gtp_version == GTP_V1) | |
932 | netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n", | |
933 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); | |
934 | ||
935 | return 0; | |
936 | ||
937 | } | |
938 | ||
939 | pctx = kmalloc(sizeof(struct pdp_ctx), GFP_KERNEL); | |
940 | if (pctx == NULL) | |
941 | return -ENOMEM; | |
942 | ||
943 | ipv4_pdp_fill(pctx, info); | |
944 | atomic_set(&pctx->tx_seq, 0); | |
945 | ||
946 | switch (pctx->gtp_version) { | |
947 | case GTP_V0: | |
948 | /* TS 09.60: "The flow label identifies unambiguously a GTP | |
949 | * flow.". We use the tid for this instead, I cannot find a | |
950 | * situation in which this doesn't unambiguosly identify the | |
951 | * PDP context. | |
952 | */ | |
953 | hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size; | |
954 | break; | |
955 | case GTP_V1: | |
956 | hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size; | |
957 | break; | |
958 | } | |
959 | ||
960 | hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]); | |
961 | hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]); | |
962 | ||
963 | switch (pctx->gtp_version) { | |
964 | case GTP_V0: | |
965 | netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n", | |
966 | pctx->u.v0.tid, &pctx->sgsn_addr_ip4, | |
967 | &pctx->ms_addr_ip4, pctx); | |
968 | break; | |
969 | case GTP_V1: | |
970 | netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n", | |
971 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, | |
972 | &pctx->sgsn_addr_ip4, &pctx->ms_addr_ip4, pctx); | |
973 | break; | |
974 | } | |
975 | ||
976 | return 0; | |
977 | } | |
978 | ||
979 | static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) | |
980 | { | |
981 | struct net_device *dev; | |
982 | struct net *net; | |
983 | ||
984 | if (!info->attrs[GTPA_VERSION] || | |
985 | !info->attrs[GTPA_LINK] || | |
986 | !info->attrs[GTPA_SGSN_ADDRESS] || | |
987 | !info->attrs[GTPA_MS_ADDRESS]) | |
988 | return -EINVAL; | |
989 | ||
990 | switch (nla_get_u32(info->attrs[GTPA_VERSION])) { | |
991 | case GTP_V0: | |
992 | if (!info->attrs[GTPA_TID] || | |
993 | !info->attrs[GTPA_FLOW]) | |
994 | return -EINVAL; | |
995 | break; | |
996 | case GTP_V1: | |
997 | if (!info->attrs[GTPA_I_TEI] || | |
998 | !info->attrs[GTPA_O_TEI]) | |
999 | return -EINVAL; | |
1000 | break; | |
1001 | ||
1002 | default: | |
1003 | return -EINVAL; | |
1004 | } | |
1005 | ||
1006 | net = gtp_genl_get_net(sock_net(skb->sk), info->attrs); | |
1007 | if (IS_ERR(net)) | |
1008 | return PTR_ERR(net); | |
1009 | ||
1010 | /* Check if there's an existing gtpX device to configure */ | |
1011 | dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK])); | |
27ee441a PN |
1012 | if (dev == NULL) { |
1013 | put_net(net); | |
459aa660 | 1014 | return -ENODEV; |
27ee441a PN |
1015 | } |
1016 | put_net(net); | |
459aa660 PN |
1017 | |
1018 | return ipv4_pdp_add(dev, info); | |
1019 | } | |
1020 | ||
1021 | static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) | |
1022 | { | |
1023 | struct net_device *dev; | |
1024 | struct pdp_ctx *pctx; | |
1025 | struct gtp_dev *gtp; | |
1026 | struct net *net; | |
1027 | ||
1028 | if (!info->attrs[GTPA_VERSION] || | |
1029 | !info->attrs[GTPA_LINK]) | |
1030 | return -EINVAL; | |
1031 | ||
1032 | net = gtp_genl_get_net(sock_net(skb->sk), info->attrs); | |
1033 | if (IS_ERR(net)) | |
1034 | return PTR_ERR(net); | |
1035 | ||
1036 | /* Check if there's an existing gtpX device to configure */ | |
1037 | dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK])); | |
27ee441a PN |
1038 | if (dev == NULL) { |
1039 | put_net(net); | |
459aa660 | 1040 | return -ENODEV; |
27ee441a PN |
1041 | } |
1042 | put_net(net); | |
459aa660 PN |
1043 | |
1044 | gtp = netdev_priv(dev); | |
1045 | ||
1046 | switch (nla_get_u32(info->attrs[GTPA_VERSION])) { | |
1047 | case GTP_V0: | |
1048 | if (!info->attrs[GTPA_TID]) | |
1049 | return -EINVAL; | |
1050 | pctx = gtp0_pdp_find(gtp, nla_get_u64(info->attrs[GTPA_TID])); | |
1051 | break; | |
1052 | case GTP_V1: | |
1053 | if (!info->attrs[GTPA_I_TEI]) | |
1054 | return -EINVAL; | |
1055 | pctx = gtp1_pdp_find(gtp, nla_get_u64(info->attrs[GTPA_I_TEI])); | |
1056 | break; | |
1057 | ||
1058 | default: | |
1059 | return -EINVAL; | |
1060 | } | |
1061 | ||
1062 | if (pctx == NULL) | |
1063 | return -ENOENT; | |
1064 | ||
1065 | if (pctx->gtp_version == GTP_V0) | |
1066 | netdev_dbg(dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n", | |
1067 | pctx->u.v0.tid, pctx); | |
1068 | else if (pctx->gtp_version == GTP_V1) | |
1069 | netdev_dbg(dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n", | |
1070 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); | |
1071 | ||
1072 | hlist_del_rcu(&pctx->hlist_tid); | |
1073 | hlist_del_rcu(&pctx->hlist_addr); | |
1074 | kfree_rcu(pctx, rcu_head); | |
1075 | ||
1076 | return 0; | |
1077 | } | |
1078 | ||
489111e5 | 1079 | static struct genl_family gtp_genl_family; |
459aa660 PN |
1080 | |
1081 | static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, | |
1082 | u32 type, struct pdp_ctx *pctx) | |
1083 | { | |
1084 | void *genlh; | |
1085 | ||
1086 | genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, 0, | |
1087 | type); | |
1088 | if (genlh == NULL) | |
1089 | goto nlmsg_failure; | |
1090 | ||
1091 | if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) || | |
1092 | nla_put_be32(skb, GTPA_SGSN_ADDRESS, pctx->sgsn_addr_ip4.s_addr) || | |
1093 | nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr)) | |
1094 | goto nla_put_failure; | |
1095 | ||
1096 | switch (pctx->gtp_version) { | |
1097 | case GTP_V0: | |
1098 | if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) || | |
1099 | nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow)) | |
1100 | goto nla_put_failure; | |
1101 | break; | |
1102 | case GTP_V1: | |
1103 | if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) || | |
1104 | nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei)) | |
1105 | goto nla_put_failure; | |
1106 | break; | |
1107 | } | |
1108 | genlmsg_end(skb, genlh); | |
1109 | return 0; | |
1110 | ||
1111 | nlmsg_failure: | |
1112 | nla_put_failure: | |
1113 | genlmsg_cancel(skb, genlh); | |
1114 | return -EMSGSIZE; | |
1115 | } | |
1116 | ||
1117 | static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) | |
1118 | { | |
1119 | struct pdp_ctx *pctx = NULL; | |
1120 | struct net_device *dev; | |
1121 | struct sk_buff *skb2; | |
1122 | struct gtp_dev *gtp; | |
1123 | u32 gtp_version; | |
1124 | struct net *net; | |
1125 | int err; | |
1126 | ||
1127 | if (!info->attrs[GTPA_VERSION] || | |
1128 | !info->attrs[GTPA_LINK]) | |
1129 | return -EINVAL; | |
1130 | ||
1131 | gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); | |
1132 | switch (gtp_version) { | |
1133 | case GTP_V0: | |
1134 | case GTP_V1: | |
1135 | break; | |
1136 | default: | |
1137 | return -EINVAL; | |
1138 | } | |
1139 | ||
1140 | net = gtp_genl_get_net(sock_net(skb->sk), info->attrs); | |
1141 | if (IS_ERR(net)) | |
1142 | return PTR_ERR(net); | |
1143 | ||
1144 | /* Check if there's an existing gtpX device to configure */ | |
1145 | dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK])); | |
27ee441a PN |
1146 | if (dev == NULL) { |
1147 | put_net(net); | |
459aa660 | 1148 | return -ENODEV; |
27ee441a PN |
1149 | } |
1150 | put_net(net); | |
459aa660 PN |
1151 | |
1152 | gtp = netdev_priv(dev); | |
1153 | ||
1154 | rcu_read_lock(); | |
1155 | if (gtp_version == GTP_V0 && | |
1156 | info->attrs[GTPA_TID]) { | |
1157 | u64 tid = nla_get_u64(info->attrs[GTPA_TID]); | |
1158 | ||
1159 | pctx = gtp0_pdp_find(gtp, tid); | |
1160 | } else if (gtp_version == GTP_V1 && | |
1161 | info->attrs[GTPA_I_TEI]) { | |
1162 | u32 tid = nla_get_u32(info->attrs[GTPA_I_TEI]); | |
1163 | ||
1164 | pctx = gtp1_pdp_find(gtp, tid); | |
1165 | } else if (info->attrs[GTPA_MS_ADDRESS]) { | |
1166 | __be32 ip = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
1167 | ||
1168 | pctx = ipv4_pdp_find(gtp, ip); | |
1169 | } | |
1170 | ||
1171 | if (pctx == NULL) { | |
1172 | err = -ENOENT; | |
1173 | goto err_unlock; | |
1174 | } | |
1175 | ||
1176 | skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); | |
1177 | if (skb2 == NULL) { | |
1178 | err = -ENOMEM; | |
1179 | goto err_unlock; | |
1180 | } | |
1181 | ||
1182 | err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, | |
1183 | info->snd_seq, info->nlhdr->nlmsg_type, pctx); | |
1184 | if (err < 0) | |
1185 | goto err_unlock_free; | |
1186 | ||
1187 | rcu_read_unlock(); | |
1188 | return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid); | |
1189 | ||
1190 | err_unlock_free: | |
1191 | kfree_skb(skb2); | |
1192 | err_unlock: | |
1193 | rcu_read_unlock(); | |
1194 | return err; | |
1195 | } | |
1196 | ||
1197 | static int gtp_genl_dump_pdp(struct sk_buff *skb, | |
1198 | struct netlink_callback *cb) | |
1199 | { | |
1200 | struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp; | |
1201 | struct net *net = sock_net(skb->sk); | |
1202 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1203 | unsigned long tid = cb->args[1]; | |
1204 | int i, k = cb->args[0], ret; | |
1205 | struct pdp_ctx *pctx; | |
1206 | ||
1207 | if (cb->args[4]) | |
1208 | return 0; | |
1209 | ||
1210 | list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { | |
1211 | if (last_gtp && last_gtp != gtp) | |
1212 | continue; | |
1213 | else | |
1214 | last_gtp = NULL; | |
1215 | ||
1216 | for (i = k; i < gtp->hash_size; i++) { | |
1217 | hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) { | |
1218 | if (tid && tid != pctx->u.tid) | |
1219 | continue; | |
1220 | else | |
1221 | tid = 0; | |
1222 | ||
1223 | ret = gtp_genl_fill_info(skb, | |
1224 | NETLINK_CB(cb->skb).portid, | |
1225 | cb->nlh->nlmsg_seq, | |
1226 | cb->nlh->nlmsg_type, pctx); | |
1227 | if (ret < 0) { | |
1228 | cb->args[0] = i; | |
1229 | cb->args[1] = pctx->u.tid; | |
1230 | cb->args[2] = (unsigned long)gtp; | |
1231 | goto out; | |
1232 | } | |
1233 | } | |
1234 | } | |
1235 | } | |
1236 | cb->args[4] = 1; | |
1237 | out: | |
1238 | return skb->len; | |
1239 | } | |
1240 | ||
1241 | static struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = { | |
1242 | [GTPA_LINK] = { .type = NLA_U32, }, | |
1243 | [GTPA_VERSION] = { .type = NLA_U32, }, | |
1244 | [GTPA_TID] = { .type = NLA_U64, }, | |
1245 | [GTPA_SGSN_ADDRESS] = { .type = NLA_U32, }, | |
1246 | [GTPA_MS_ADDRESS] = { .type = NLA_U32, }, | |
1247 | [GTPA_FLOW] = { .type = NLA_U16, }, | |
1248 | [GTPA_NET_NS_FD] = { .type = NLA_U32, }, | |
1249 | [GTPA_I_TEI] = { .type = NLA_U32, }, | |
1250 | [GTPA_O_TEI] = { .type = NLA_U32, }, | |
1251 | }; | |
1252 | ||
1253 | static const struct genl_ops gtp_genl_ops[] = { | |
1254 | { | |
1255 | .cmd = GTP_CMD_NEWPDP, | |
1256 | .doit = gtp_genl_new_pdp, | |
1257 | .policy = gtp_genl_policy, | |
1258 | .flags = GENL_ADMIN_PERM, | |
1259 | }, | |
1260 | { | |
1261 | .cmd = GTP_CMD_DELPDP, | |
1262 | .doit = gtp_genl_del_pdp, | |
1263 | .policy = gtp_genl_policy, | |
1264 | .flags = GENL_ADMIN_PERM, | |
1265 | }, | |
1266 | { | |
1267 | .cmd = GTP_CMD_GETPDP, | |
1268 | .doit = gtp_genl_get_pdp, | |
1269 | .dumpit = gtp_genl_dump_pdp, | |
1270 | .policy = gtp_genl_policy, | |
1271 | .flags = GENL_ADMIN_PERM, | |
1272 | }, | |
1273 | }; | |
1274 | ||
56989f6d | 1275 | static struct genl_family gtp_genl_family __ro_after_init = { |
489111e5 JB |
1276 | .name = "gtp", |
1277 | .version = 0, | |
1278 | .hdrsize = 0, | |
1279 | .maxattr = GTPA_MAX, | |
1280 | .netnsok = true, | |
1281 | .module = THIS_MODULE, | |
1282 | .ops = gtp_genl_ops, | |
1283 | .n_ops = ARRAY_SIZE(gtp_genl_ops), | |
1284 | }; | |
1285 | ||
459aa660 PN |
1286 | static int __net_init gtp_net_init(struct net *net) |
1287 | { | |
1288 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1289 | ||
1290 | INIT_LIST_HEAD(&gn->gtp_dev_list); | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | static void __net_exit gtp_net_exit(struct net *net) | |
1295 | { | |
1296 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1297 | struct gtp_dev *gtp; | |
1298 | LIST_HEAD(list); | |
1299 | ||
1300 | rtnl_lock(); | |
1301 | list_for_each_entry(gtp, &gn->gtp_dev_list, list) | |
1302 | gtp_dellink(gtp->dev, &list); | |
1303 | ||
1304 | unregister_netdevice_many(&list); | |
1305 | rtnl_unlock(); | |
1306 | } | |
1307 | ||
1308 | static struct pernet_operations gtp_net_ops = { | |
1309 | .init = gtp_net_init, | |
1310 | .exit = gtp_net_exit, | |
1311 | .id = >p_net_id, | |
1312 | .size = sizeof(struct gtp_net), | |
1313 | }; | |
1314 | ||
1315 | static int __init gtp_init(void) | |
1316 | { | |
1317 | int err; | |
1318 | ||
1319 | get_random_bytes(>p_h_initval, sizeof(gtp_h_initval)); | |
1320 | ||
1321 | err = rtnl_link_register(>p_link_ops); | |
1322 | if (err < 0) | |
1323 | goto error_out; | |
1324 | ||
489111e5 | 1325 | err = genl_register_family(>p_genl_family); |
459aa660 PN |
1326 | if (err < 0) |
1327 | goto unreg_rtnl_link; | |
1328 | ||
1329 | err = register_pernet_subsys(>p_net_ops); | |
1330 | if (err < 0) | |
1331 | goto unreg_genl_family; | |
1332 | ||
1333 | pr_info("GTP module loaded (pdp ctx size %Zd bytes)\n", | |
1334 | sizeof(struct pdp_ctx)); | |
1335 | return 0; | |
1336 | ||
1337 | unreg_genl_family: | |
1338 | genl_unregister_family(>p_genl_family); | |
1339 | unreg_rtnl_link: | |
1340 | rtnl_link_unregister(>p_link_ops); | |
1341 | error_out: | |
1342 | pr_err("error loading GTP module loaded\n"); | |
1343 | return err; | |
1344 | } | |
1345 | late_initcall(gtp_init); | |
1346 | ||
1347 | static void __exit gtp_fini(void) | |
1348 | { | |
1349 | unregister_pernet_subsys(>p_net_ops); | |
1350 | genl_unregister_family(>p_genl_family); | |
1351 | rtnl_link_unregister(>p_link_ops); | |
1352 | ||
1353 | pr_info("GTP module unloaded\n"); | |
1354 | } | |
1355 | module_exit(gtp_fini); | |
1356 | ||
1357 | MODULE_LICENSE("GPL"); | |
1358 | MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>"); | |
1359 | MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic"); | |
1360 | MODULE_ALIAS_RTNL_LINK("gtp"); | |
ab729823 | 1361 | MODULE_ALIAS_GENL_FAMILY("gtp"); |