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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
459aa660 PN |
2 | /* GTP according to GSM TS 09.60 / 3GPP TS 29.060 |
3 | * | |
4 | * (C) 2012-2014 by sysmocom - s.f.m.c. GmbH | |
5 | * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org> | |
6 | * | |
7 | * Author: Harald Welte <hwelte@sysmocom.de> | |
8 | * Pablo Neira Ayuso <pablo@netfilter.org> | |
9 | * Andreas Schultz <aschultz@travelping.com> | |
459aa660 PN |
10 | */ |
11 | ||
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
13 | ||
14 | #include <linux/module.h> | |
459aa660 PN |
15 | #include <linux/skbuff.h> |
16 | #include <linux/udp.h> | |
17 | #include <linux/rculist.h> | |
18 | #include <linux/jhash.h> | |
19 | #include <linux/if_tunnel.h> | |
20 | #include <linux/net.h> | |
21 | #include <linux/file.h> | |
22 | #include <linux/gtp.h> | |
23 | ||
24 | #include <net/net_namespace.h> | |
25 | #include <net/protocol.h> | |
26 | #include <net/ip.h> | |
27 | #include <net/udp.h> | |
28 | #include <net/udp_tunnel.h> | |
29 | #include <net/icmp.h> | |
30 | #include <net/xfrm.h> | |
31 | #include <net/genetlink.h> | |
32 | #include <net/netns/generic.h> | |
33 | #include <net/gtp.h> | |
34 | ||
35 | /* An active session for the subscriber. */ | |
36 | struct pdp_ctx { | |
37 | struct hlist_node hlist_tid; | |
38 | struct hlist_node hlist_addr; | |
39 | ||
40 | union { | |
41 | u64 tid; | |
42 | struct { | |
43 | u64 tid; | |
44 | u16 flow; | |
45 | } v0; | |
46 | struct { | |
47 | u32 i_tei; | |
48 | u32 o_tei; | |
49 | } v1; | |
50 | } u; | |
51 | u8 gtp_version; | |
52 | u16 af; | |
53 | ||
54 | struct in_addr ms_addr_ip4; | |
ae6336b5 | 55 | struct in_addr peer_addr_ip4; |
459aa660 | 56 | |
101cfbc1 | 57 | struct sock *sk; |
5b171f9c AS |
58 | struct net_device *dev; |
59 | ||
459aa660 PN |
60 | atomic_t tx_seq; |
61 | struct rcu_head rcu_head; | |
62 | }; | |
63 | ||
64 | /* One instance of the GTP device. */ | |
65 | struct gtp_dev { | |
66 | struct list_head list; | |
67 | ||
17886c47 AS |
68 | struct sock *sk0; |
69 | struct sock *sk1u; | |
459aa660 | 70 | |
459aa660 PN |
71 | struct net_device *dev; |
72 | ||
91ed81f9 | 73 | unsigned int role; |
459aa660 PN |
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 | ||
6b5e2e74 AS |
87 | static void pdp_context_delete(struct pdp_ctx *pctx); |
88 | ||
459aa660 PN |
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 | ||
91ed81f9 JB |
154 | static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx, |
155 | unsigned int hdrlen, unsigned int role) | |
459aa660 PN |
156 | { |
157 | struct iphdr *iph; | |
158 | ||
159 | if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr))) | |
160 | return false; | |
161 | ||
88edf103 | 162 | iph = (struct iphdr *)(skb->data + hdrlen); |
459aa660 | 163 | |
91ed81f9 JB |
164 | if (role == GTP_ROLE_SGSN) |
165 | return iph->daddr == pctx->ms_addr_ip4.s_addr; | |
166 | else | |
167 | return iph->saddr == pctx->ms_addr_ip4.s_addr; | |
459aa660 PN |
168 | } |
169 | ||
91ed81f9 | 170 | /* Check if the inner IP address in this packet is assigned to any |
459aa660 PN |
171 | * existing mobile subscriber. |
172 | */ | |
91ed81f9 JB |
173 | static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx, |
174 | unsigned int hdrlen, unsigned int role) | |
459aa660 PN |
175 | { |
176 | switch (ntohs(skb->protocol)) { | |
177 | case ETH_P_IP: | |
91ed81f9 | 178 | return gtp_check_ms_ipv4(skb, pctx, hdrlen, role); |
459aa660 PN |
179 | } |
180 | return false; | |
181 | } | |
182 | ||
91ed81f9 JB |
183 | static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, |
184 | unsigned int hdrlen, unsigned int role) | |
5b171f9c AS |
185 | { |
186 | struct pcpu_sw_netstats *stats; | |
187 | ||
91ed81f9 | 188 | if (!gtp_check_ms(skb, pctx, hdrlen, role)) { |
5b171f9c AS |
189 | netdev_dbg(pctx->dev, "No PDP ctx for this MS\n"); |
190 | return 1; | |
191 | } | |
192 | ||
193 | /* Get rid of the GTP + UDP headers. */ | |
101cfbc1 AS |
194 | if (iptunnel_pull_header(skb, hdrlen, skb->protocol, |
195 | !net_eq(sock_net(pctx->sk), dev_net(pctx->dev)))) | |
5b171f9c AS |
196 | return -1; |
197 | ||
198 | netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n"); | |
199 | ||
200 | /* Now that the UDP and the GTP header have been removed, set up the | |
201 | * new network header. This is required by the upper layer to | |
202 | * calculate the transport header. | |
203 | */ | |
204 | skb_reset_network_header(skb); | |
205 | ||
206 | skb->dev = pctx->dev; | |
207 | ||
208 | stats = this_cpu_ptr(pctx->dev->tstats); | |
209 | u64_stats_update_begin(&stats->syncp); | |
210 | stats->rx_packets++; | |
211 | stats->rx_bytes += skb->len; | |
212 | u64_stats_update_end(&stats->syncp); | |
213 | ||
214 | netif_rx(skb); | |
215 | return 0; | |
216 | } | |
217 | ||
459aa660 | 218 | /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */ |
101cfbc1 | 219 | static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) |
459aa660 PN |
220 | { |
221 | unsigned int hdrlen = sizeof(struct udphdr) + | |
222 | sizeof(struct gtp0_header); | |
223 | struct gtp0_header *gtp0; | |
224 | struct pdp_ctx *pctx; | |
459aa660 PN |
225 | |
226 | if (!pskb_may_pull(skb, hdrlen)) | |
227 | return -1; | |
228 | ||
229 | gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); | |
230 | ||
231 | if ((gtp0->flags >> 5) != GTP_V0) | |
232 | return 1; | |
233 | ||
234 | if (gtp0->type != GTP_TPDU) | |
235 | return 1; | |
236 | ||
459aa660 PN |
237 | pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid)); |
238 | if (!pctx) { | |
239 | netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); | |
1796a81d | 240 | return 1; |
459aa660 PN |
241 | } |
242 | ||
91ed81f9 | 243 | return gtp_rx(pctx, skb, hdrlen, gtp->role); |
459aa660 PN |
244 | } |
245 | ||
101cfbc1 | 246 | static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) |
459aa660 PN |
247 | { |
248 | unsigned int hdrlen = sizeof(struct udphdr) + | |
249 | sizeof(struct gtp1_header); | |
250 | struct gtp1_header *gtp1; | |
251 | struct pdp_ctx *pctx; | |
459aa660 PN |
252 | |
253 | if (!pskb_may_pull(skb, hdrlen)) | |
254 | return -1; | |
255 | ||
256 | gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); | |
257 | ||
258 | if ((gtp1->flags >> 5) != GTP_V1) | |
259 | return 1; | |
260 | ||
261 | if (gtp1->type != GTP_TPDU) | |
262 | return 1; | |
263 | ||
264 | /* From 29.060: "This field shall be present if and only if any one or | |
265 | * more of the S, PN and E flags are set.". | |
266 | * | |
267 | * If any of the bit is set, then the remaining ones also have to be | |
268 | * set. | |
269 | */ | |
270 | if (gtp1->flags & GTP1_F_MASK) | |
271 | hdrlen += 4; | |
272 | ||
273 | /* Make sure the header is larger enough, including extensions. */ | |
274 | if (!pskb_may_pull(skb, hdrlen)) | |
275 | return -1; | |
276 | ||
93edb8c7 PN |
277 | gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); |
278 | ||
459aa660 PN |
279 | pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid)); |
280 | if (!pctx) { | |
281 | netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); | |
1796a81d | 282 | return 1; |
459aa660 PN |
283 | } |
284 | ||
91ed81f9 | 285 | return gtp_rx(pctx, skb, hdrlen, gtp->role); |
459aa660 PN |
286 | } |
287 | ||
1e3a3abd | 288 | static void gtp_encap_destroy(struct sock *sk) |
459aa660 | 289 | { |
1e3a3abd | 290 | struct gtp_dev *gtp; |
459aa660 | 291 | |
1e3a3abd AS |
292 | gtp = rcu_dereference_sk_user_data(sk); |
293 | if (gtp) { | |
294 | udp_sk(sk)->encap_type = 0; | |
295 | rcu_assign_sk_user_data(sk, NULL); | |
296 | sock_put(sk); | |
297 | } | |
459aa660 PN |
298 | } |
299 | ||
1e3a3abd | 300 | static void gtp_encap_disable_sock(struct sock *sk) |
459aa660 | 301 | { |
1e3a3abd AS |
302 | if (!sk) |
303 | return; | |
459aa660 | 304 | |
1e3a3abd AS |
305 | gtp_encap_destroy(sk); |
306 | } | |
307 | ||
308 | static void gtp_encap_disable(struct gtp_dev *gtp) | |
309 | { | |
310 | gtp_encap_disable_sock(gtp->sk0); | |
311 | gtp_encap_disable_sock(gtp->sk1u); | |
459aa660 PN |
312 | } |
313 | ||
314 | /* UDP encapsulation receive handler. See net/ipv4/udp.c. | |
315 | * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket. | |
316 | */ | |
317 | static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
318 | { | |
459aa660 | 319 | struct gtp_dev *gtp; |
5b171f9c | 320 | int ret = 0; |
459aa660 PN |
321 | |
322 | gtp = rcu_dereference_sk_user_data(sk); | |
323 | if (!gtp) | |
324 | return 1; | |
325 | ||
326 | netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); | |
327 | ||
459aa660 PN |
328 | switch (udp_sk(sk)->encap_type) { |
329 | case UDP_ENCAP_GTP0: | |
330 | netdev_dbg(gtp->dev, "received GTP0 packet\n"); | |
101cfbc1 | 331 | ret = gtp0_udp_encap_recv(gtp, skb); |
459aa660 PN |
332 | break; |
333 | case UDP_ENCAP_GTP1U: | |
334 | netdev_dbg(gtp->dev, "received GTP1U packet\n"); | |
101cfbc1 | 335 | ret = gtp1u_udp_encap_recv(gtp, skb); |
459aa660 PN |
336 | break; |
337 | default: | |
338 | ret = -1; /* Shouldn't happen. */ | |
339 | } | |
340 | ||
341 | switch (ret) { | |
342 | case 1: | |
343 | netdev_dbg(gtp->dev, "pass up to the process\n"); | |
5b171f9c | 344 | break; |
459aa660 | 345 | case 0: |
459aa660 PN |
346 | break; |
347 | case -1: | |
348 | netdev_dbg(gtp->dev, "GTP packet has been dropped\n"); | |
349 | kfree_skb(skb); | |
5b171f9c AS |
350 | ret = 0; |
351 | break; | |
459aa660 PN |
352 | } |
353 | ||
5b171f9c | 354 | return ret; |
459aa660 PN |
355 | } |
356 | ||
357 | static int gtp_dev_init(struct net_device *dev) | |
358 | { | |
359 | struct gtp_dev *gtp = netdev_priv(dev); | |
360 | ||
361 | gtp->dev = dev; | |
362 | ||
790cb2eb | 363 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
459aa660 PN |
364 | if (!dev->tstats) |
365 | return -ENOMEM; | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static void gtp_dev_uninit(struct net_device *dev) | |
371 | { | |
372 | struct gtp_dev *gtp = netdev_priv(dev); | |
373 | ||
374 | gtp_encap_disable(gtp); | |
375 | free_percpu(dev->tstats); | |
376 | } | |
377 | ||
101cfbc1 AS |
378 | static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4, |
379 | const struct sock *sk, | |
380 | __be32 daddr) | |
459aa660 PN |
381 | { |
382 | memset(fl4, 0, sizeof(*fl4)); | |
383 | fl4->flowi4_oif = sk->sk_bound_dev_if; | |
384 | fl4->daddr = daddr; | |
385 | fl4->saddr = inet_sk(sk)->inet_saddr; | |
386 | fl4->flowi4_tos = RT_CONN_FLAGS(sk); | |
387 | fl4->flowi4_proto = sk->sk_protocol; | |
388 | ||
101cfbc1 | 389 | return ip_route_output_key(sock_net(sk), fl4); |
459aa660 PN |
390 | } |
391 | ||
392 | static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) | |
393 | { | |
394 | int payload_len = skb->len; | |
395 | struct gtp0_header *gtp0; | |
396 | ||
d58ff351 | 397 | gtp0 = skb_push(skb, sizeof(*gtp0)); |
459aa660 PN |
398 | |
399 | gtp0->flags = 0x1e; /* v0, GTP-non-prime. */ | |
400 | gtp0->type = GTP_TPDU; | |
401 | gtp0->length = htons(payload_len); | |
402 | gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff); | |
403 | gtp0->flow = htons(pctx->u.v0.flow); | |
404 | gtp0->number = 0xff; | |
405 | gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff; | |
406 | gtp0->tid = cpu_to_be64(pctx->u.v0.tid); | |
407 | } | |
408 | ||
409 | static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) | |
410 | { | |
411 | int payload_len = skb->len; | |
412 | struct gtp1_header *gtp1; | |
413 | ||
d58ff351 | 414 | gtp1 = skb_push(skb, sizeof(*gtp1)); |
459aa660 PN |
415 | |
416 | /* Bits 8 7 6 5 4 3 2 1 | |
417 | * +--+--+--+--+--+--+--+--+ | |
d928be81 | 418 | * |version |PT| 0| E| S|PN| |
459aa660 PN |
419 | * +--+--+--+--+--+--+--+--+ |
420 | * 0 0 1 1 1 0 0 0 | |
421 | */ | |
d928be81 | 422 | gtp1->flags = 0x30; /* v1, GTP-non-prime. */ |
459aa660 PN |
423 | gtp1->type = GTP_TPDU; |
424 | gtp1->length = htons(payload_len); | |
425 | gtp1->tid = htonl(pctx->u.v1.o_tei); | |
426 | ||
427 | /* TODO: Suppport for extension header, sequence number and N-PDU. | |
428 | * Update the length field if any of them is available. | |
429 | */ | |
430 | } | |
431 | ||
432 | struct gtp_pktinfo { | |
433 | struct sock *sk; | |
434 | struct iphdr *iph; | |
435 | struct flowi4 fl4; | |
436 | struct rtable *rt; | |
437 | struct pdp_ctx *pctx; | |
438 | struct net_device *dev; | |
439 | __be16 gtph_port; | |
440 | }; | |
441 | ||
442 | static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo) | |
443 | { | |
444 | switch (pktinfo->pctx->gtp_version) { | |
445 | case GTP_V0: | |
446 | pktinfo->gtph_port = htons(GTP0_PORT); | |
447 | gtp0_push_header(skb, pktinfo->pctx); | |
448 | break; | |
449 | case GTP_V1: | |
450 | pktinfo->gtph_port = htons(GTP1U_PORT); | |
451 | gtp1_push_header(skb, pktinfo->pctx); | |
452 | break; | |
453 | } | |
454 | } | |
455 | ||
456 | static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, | |
457 | struct sock *sk, struct iphdr *iph, | |
458 | struct pdp_ctx *pctx, struct rtable *rt, | |
459 | struct flowi4 *fl4, | |
460 | struct net_device *dev) | |
461 | { | |
462 | pktinfo->sk = sk; | |
463 | pktinfo->iph = iph; | |
464 | pktinfo->pctx = pctx; | |
465 | pktinfo->rt = rt; | |
466 | pktinfo->fl4 = *fl4; | |
467 | pktinfo->dev = dev; | |
468 | } | |
469 | ||
470 | static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, | |
471 | struct gtp_pktinfo *pktinfo) | |
472 | { | |
473 | struct gtp_dev *gtp = netdev_priv(dev); | |
474 | struct pdp_ctx *pctx; | |
475 | struct rtable *rt; | |
476 | struct flowi4 fl4; | |
477 | struct iphdr *iph; | |
459aa660 PN |
478 | __be16 df; |
479 | int mtu; | |
480 | ||
481 | /* Read the IP destination address and resolve the PDP context. | |
482 | * Prepend PDP header with TEI/TID from PDP ctx. | |
483 | */ | |
484 | iph = ip_hdr(skb); | |
91ed81f9 JB |
485 | if (gtp->role == GTP_ROLE_SGSN) |
486 | pctx = ipv4_pdp_find(gtp, iph->saddr); | |
487 | else | |
488 | pctx = ipv4_pdp_find(gtp, iph->daddr); | |
489 | ||
459aa660 PN |
490 | if (!pctx) { |
491 | netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", | |
492 | &iph->daddr); | |
493 | return -ENOENT; | |
494 | } | |
495 | netdev_dbg(dev, "found PDP context %p\n", pctx); | |
496 | ||
ae6336b5 | 497 | rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr); |
459aa660 PN |
498 | if (IS_ERR(rt)) { |
499 | netdev_dbg(dev, "no route to SSGN %pI4\n", | |
ae6336b5 | 500 | &pctx->peer_addr_ip4.s_addr); |
459aa660 PN |
501 | dev->stats.tx_carrier_errors++; |
502 | goto err; | |
503 | } | |
504 | ||
505 | if (rt->dst.dev == dev) { | |
506 | netdev_dbg(dev, "circular route to SSGN %pI4\n", | |
ae6336b5 | 507 | &pctx->peer_addr_ip4.s_addr); |
459aa660 PN |
508 | dev->stats.collisions++; |
509 | goto err_rt; | |
510 | } | |
511 | ||
512 | skb_dst_drop(skb); | |
513 | ||
514 | /* This is similar to tnl_update_pmtu(). */ | |
515 | df = iph->frag_off; | |
516 | if (df) { | |
517 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - | |
518 | sizeof(struct iphdr) - sizeof(struct udphdr); | |
519 | switch (pctx->gtp_version) { | |
520 | case GTP_V0: | |
521 | mtu -= sizeof(struct gtp0_header); | |
522 | break; | |
523 | case GTP_V1: | |
524 | mtu -= sizeof(struct gtp1_header); | |
525 | break; | |
526 | } | |
527 | } else { | |
528 | mtu = dst_mtu(&rt->dst); | |
529 | } | |
530 | ||
531 | rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu); | |
532 | ||
533 | if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) && | |
534 | mtu < ntohs(iph->tot_len)) { | |
535 | netdev_dbg(dev, "packet too big, fragmentation needed\n"); | |
536 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
537 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
538 | htonl(mtu)); | |
539 | goto err_rt; | |
540 | } | |
541 | ||
101cfbc1 | 542 | gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev); |
459aa660 PN |
543 | gtp_push_header(skb, pktinfo); |
544 | ||
545 | return 0; | |
546 | err_rt: | |
547 | ip_rt_put(rt); | |
548 | err: | |
549 | return -EBADMSG; | |
550 | } | |
551 | ||
552 | static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) | |
553 | { | |
554 | unsigned int proto = ntohs(skb->protocol); | |
555 | struct gtp_pktinfo pktinfo; | |
556 | int err; | |
557 | ||
558 | /* Ensure there is sufficient headroom. */ | |
559 | if (skb_cow_head(skb, dev->needed_headroom)) | |
560 | goto tx_err; | |
561 | ||
562 | skb_reset_inner_headers(skb); | |
563 | ||
564 | /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */ | |
565 | rcu_read_lock(); | |
566 | switch (proto) { | |
567 | case ETH_P_IP: | |
568 | err = gtp_build_skb_ip4(skb, dev, &pktinfo); | |
569 | break; | |
570 | default: | |
571 | err = -EOPNOTSUPP; | |
572 | break; | |
573 | } | |
574 | rcu_read_unlock(); | |
575 | ||
576 | if (err < 0) | |
577 | goto tx_err; | |
578 | ||
579 | switch (proto) { | |
580 | case ETH_P_IP: | |
581 | netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n", | |
582 | &pktinfo.iph->saddr, &pktinfo.iph->daddr); | |
583 | udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, | |
584 | pktinfo.fl4.saddr, pktinfo.fl4.daddr, | |
585 | pktinfo.iph->tos, | |
586 | ip4_dst_hoplimit(&pktinfo.rt->dst), | |
c6ce1d08 | 587 | 0, |
459aa660 PN |
588 | pktinfo.gtph_port, pktinfo.gtph_port, |
589 | true, false); | |
590 | break; | |
591 | } | |
592 | ||
593 | return NETDEV_TX_OK; | |
594 | tx_err: | |
595 | dev->stats.tx_errors++; | |
596 | dev_kfree_skb(skb); | |
597 | return NETDEV_TX_OK; | |
598 | } | |
599 | ||
600 | static const struct net_device_ops gtp_netdev_ops = { | |
601 | .ndo_init = gtp_dev_init, | |
602 | .ndo_uninit = gtp_dev_uninit, | |
603 | .ndo_start_xmit = gtp_dev_xmit, | |
604 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
605 | }; | |
606 | ||
607 | static void gtp_link_setup(struct net_device *dev) | |
608 | { | |
609 | dev->netdev_ops = >p_netdev_ops; | |
cf124db5 | 610 | dev->needs_free_netdev = true; |
459aa660 PN |
611 | |
612 | dev->hard_header_len = 0; | |
613 | dev->addr_len = 0; | |
614 | ||
615 | /* Zero header length. */ | |
616 | dev->type = ARPHRD_NONE; | |
617 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
618 | ||
619 | dev->priv_flags |= IFF_NO_QUEUE; | |
620 | dev->features |= NETIF_F_LLTX; | |
621 | netif_keep_dst(dev); | |
622 | ||
623 | /* Assume largest header, ie. GTPv0. */ | |
624 | dev->needed_headroom = LL_MAX_HEADER + | |
625 | sizeof(struct iphdr) + | |
626 | sizeof(struct udphdr) + | |
627 | sizeof(struct gtp0_header); | |
628 | } | |
629 | ||
630 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); | |
631 | static void gtp_hashtable_free(struct gtp_dev *gtp); | |
1e3a3abd | 632 | static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]); |
459aa660 PN |
633 | |
634 | static int gtp_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
635 | struct nlattr *tb[], struct nlattr *data[], |
636 | struct netlink_ext_ack *extack) | |
459aa660 | 637 | { |
459aa660 PN |
638 | struct gtp_dev *gtp; |
639 | struct gtp_net *gn; | |
1e3a3abd | 640 | int hashsize, err; |
459aa660 | 641 | |
1e3a3abd | 642 | if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1]) |
459aa660 PN |
643 | return -EINVAL; |
644 | ||
645 | gtp = netdev_priv(dev); | |
646 | ||
1e3a3abd | 647 | err = gtp_encap_enable(gtp, data); |
459aa660 | 648 | if (err < 0) |
1e3a3abd | 649 | return err; |
459aa660 PN |
650 | |
651 | if (!data[IFLA_GTP_PDP_HASHSIZE]) | |
652 | hashsize = 1024; | |
653 | else | |
654 | hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]); | |
655 | ||
656 | err = gtp_hashtable_new(gtp, hashsize); | |
657 | if (err < 0) | |
658 | goto out_encap; | |
659 | ||
660 | err = register_netdevice(dev); | |
661 | if (err < 0) { | |
662 | netdev_dbg(dev, "failed to register new netdev %d\n", err); | |
663 | goto out_hashtable; | |
664 | } | |
665 | ||
666 | gn = net_generic(dev_net(dev), gtp_net_id); | |
667 | list_add_rcu(>p->list, &gn->gtp_dev_list); | |
668 | ||
669 | netdev_dbg(dev, "registered new GTP interface\n"); | |
670 | ||
671 | return 0; | |
672 | ||
673 | out_hashtable: | |
674 | gtp_hashtable_free(gtp); | |
675 | out_encap: | |
676 | gtp_encap_disable(gtp); | |
459aa660 PN |
677 | return err; |
678 | } | |
679 | ||
680 | static void gtp_dellink(struct net_device *dev, struct list_head *head) | |
681 | { | |
682 | struct gtp_dev *gtp = netdev_priv(dev); | |
683 | ||
684 | gtp_encap_disable(gtp); | |
685 | gtp_hashtable_free(gtp); | |
686 | list_del_rcu(>p->list); | |
687 | unregister_netdevice_queue(dev, head); | |
688 | } | |
689 | ||
690 | static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = { | |
691 | [IFLA_GTP_FD0] = { .type = NLA_U32 }, | |
692 | [IFLA_GTP_FD1] = { .type = NLA_U32 }, | |
693 | [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 }, | |
91ed81f9 | 694 | [IFLA_GTP_ROLE] = { .type = NLA_U32 }, |
459aa660 PN |
695 | }; |
696 | ||
a8b8a889 MS |
697 | static int gtp_validate(struct nlattr *tb[], struct nlattr *data[], |
698 | struct netlink_ext_ack *extack) | |
459aa660 PN |
699 | { |
700 | if (!data) | |
701 | return -EINVAL; | |
702 | ||
703 | return 0; | |
704 | } | |
705 | ||
706 | static size_t gtp_get_size(const struct net_device *dev) | |
707 | { | |
708 | return nla_total_size(sizeof(__u32)); /* IFLA_GTP_PDP_HASHSIZE */ | |
709 | } | |
710 | ||
711 | static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
712 | { | |
713 | struct gtp_dev *gtp = netdev_priv(dev); | |
714 | ||
715 | if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size)) | |
716 | goto nla_put_failure; | |
717 | ||
718 | return 0; | |
719 | ||
720 | nla_put_failure: | |
721 | return -EMSGSIZE; | |
722 | } | |
723 | ||
724 | static struct rtnl_link_ops gtp_link_ops __read_mostly = { | |
725 | .kind = "gtp", | |
726 | .maxtype = IFLA_GTP_MAX, | |
727 | .policy = gtp_policy, | |
728 | .priv_size = sizeof(struct gtp_dev), | |
729 | .setup = gtp_link_setup, | |
730 | .validate = gtp_validate, | |
731 | .newlink = gtp_newlink, | |
732 | .dellink = gtp_dellink, | |
733 | .get_size = gtp_get_size, | |
734 | .fill_info = gtp_fill_info, | |
735 | }; | |
736 | ||
459aa660 PN |
737 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) |
738 | { | |
739 | int i; | |
740 | ||
6da2ec56 KC |
741 | gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head), |
742 | GFP_KERNEL); | |
459aa660 PN |
743 | if (gtp->addr_hash == NULL) |
744 | return -ENOMEM; | |
745 | ||
6da2ec56 KC |
746 | gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head), |
747 | GFP_KERNEL); | |
459aa660 PN |
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(>p->addr_hash[i]); | |
755 | INIT_HLIST_HEAD(>p->tid_hash[i]); | |
756 | } | |
757 | return 0; | |
758 | err1: | |
759 | kfree(gtp->addr_hash); | |
760 | return -ENOMEM; | |
761 | } | |
762 | ||
763 | static void gtp_hashtable_free(struct gtp_dev *gtp) | |
764 | { | |
765 | struct pdp_ctx *pctx; | |
766 | int i; | |
767 | ||
6b5e2e74 AS |
768 | for (i = 0; i < gtp->hash_size; i++) |
769 | hlist_for_each_entry_rcu(pctx, >p->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 |
777 | static 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 |
814 | out_sock: |
815 | sockfd_put(sock); | |
816 | return sk; | |
817 | } | |
459aa660 | 818 | |
1e3a3abd AS |
819 | static 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 | 857 | static 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 == >p_netdev_ops) |
3fb94617 AS |
877 | gtp = netdev_priv(dev); |
878 | ||
879 | put_net(net); | |
880 | return gtp; | |
459aa660 PN |
881 | } |
882 | ||
883 | static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) | |
884 | { | |
885 | pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); | |
886 | pctx->af = AF_INET; | |
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 |
910 | static 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, >p->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, >p->addr_hash[hash_ms]); | |
973 | hlist_add_head_rcu(&pctx->hlist_tid, >p->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 |
991 | static void pdp_context_free(struct rcu_head *head) |
992 | { | |
993 | struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head); | |
994 | ||
995 | sock_put(pctx->sk); | |
996 | kfree(pctx); | |
997 | } | |
998 | ||
6b5e2e74 AS |
999 | static void pdp_context_delete(struct pdp_ctx *pctx) |
1000 | { | |
1001 | hlist_del_rcu(&pctx->hlist_tid); | |
1002 | hlist_del_rcu(&pctx->hlist_addr); | |
101cfbc1 | 1003 | call_rcu(&pctx->rcu_head, pdp_context_free); |
6b5e2e74 AS |
1004 | } |
1005 | ||
459aa660 PN |
1006 | static 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 | |
1059 | out_unlock: | |
1060 | rcu_read_unlock(); | |
1061 | return err; | |
459aa660 PN |
1062 | } |
1063 | ||
d9e2dd12 AS |
1064 | static 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 |
1089 | static 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 | ||
1104 | static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) | |
1105 | { | |
1106 | struct pdp_ctx *pctx; | |
1107 | int err = 0; | |
1108 | ||
1109 | if (!info->attrs[GTPA_VERSION]) | |
1110 | return -EINVAL; | |
1111 | ||
1112 | rcu_read_lock(); | |
1113 | ||
1114 | pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); | |
1115 | if (IS_ERR(pctx)) { | |
1116 | err = PTR_ERR(pctx); | |
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 |
1129 | out_unlock: |
1130 | rcu_read_unlock(); | |
1131 | return err; | |
459aa660 PN |
1132 | } |
1133 | ||
489111e5 | 1134 | static struct genl_family gtp_genl_family; |
459aa660 PN |
1135 | |
1136 | static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, | |
1137 | u32 type, struct pdp_ctx *pctx) | |
1138 | { | |
1139 | void *genlh; | |
1140 | ||
1141 | genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_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 | ||
1166 | nlmsg_failure: | |
1167 | nla_put_failure: | |
1168 | genlmsg_cancel(skb, genlh); | |
1169 | return -EMSGSIZE; | |
1170 | } | |
1171 | ||
1172 | static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) | |
1173 | { | |
1174 | struct pdp_ctx *pctx = NULL; | |
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 | ||
1203 | err_unlock_free: | |
1204 | kfree_skb(skb2); | |
1205 | err_unlock: | |
1206 | rcu_read_unlock(); | |
1207 | return err; | |
1208 | } | |
1209 | ||
1210 | static int gtp_genl_dump_pdp(struct sk_buff *skb, | |
1211 | struct netlink_callback *cb) | |
1212 | { | |
1213 | struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp; | |
1214 | struct net *net = sock_net(skb->sk); | |
1215 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1216 | unsigned long tid = cb->args[1]; | |
1217 | int i, k = cb->args[0], ret; | |
1218 | struct pdp_ctx *pctx; | |
1219 | ||
1220 | if (cb->args[4]) | |
1221 | return 0; | |
1222 | ||
1223 | list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { | |
1224 | if (last_gtp && last_gtp != gtp) | |
1225 | continue; | |
1226 | else | |
1227 | last_gtp = NULL; | |
1228 | ||
1229 | for (i = k; i < gtp->hash_size; i++) { | |
1230 | hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) { | |
1231 | if (tid && tid != pctx->u.tid) | |
1232 | continue; | |
1233 | else | |
1234 | tid = 0; | |
1235 | ||
1236 | ret = gtp_genl_fill_info(skb, | |
1237 | NETLINK_CB(cb->skb).portid, | |
1238 | cb->nlh->nlmsg_seq, | |
1239 | cb->nlh->nlmsg_type, pctx); | |
1240 | if (ret < 0) { | |
1241 | cb->args[0] = i; | |
1242 | cb->args[1] = pctx->u.tid; | |
1243 | cb->args[2] = (unsigned long)gtp; | |
1244 | goto out; | |
1245 | } | |
1246 | } | |
1247 | } | |
1248 | } | |
1249 | cb->args[4] = 1; | |
1250 | out: | |
1251 | return skb->len; | |
1252 | } | |
1253 | ||
5761917a | 1254 | static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = { |
459aa660 PN |
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 | ||
1266 | static const struct genl_ops gtp_genl_ops[] = { | |
1267 | { | |
1268 | .cmd = GTP_CMD_NEWPDP, | |
ef6243ac | 1269 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 | 1270 | .doit = gtp_genl_new_pdp, |
459aa660 PN |
1271 | .flags = GENL_ADMIN_PERM, |
1272 | }, | |
1273 | { | |
1274 | .cmd = GTP_CMD_DELPDP, | |
ef6243ac | 1275 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 | 1276 | .doit = gtp_genl_del_pdp, |
459aa660 PN |
1277 | .flags = GENL_ADMIN_PERM, |
1278 | }, | |
1279 | { | |
1280 | .cmd = GTP_CMD_GETPDP, | |
ef6243ac | 1281 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 PN |
1282 | .doit = gtp_genl_get_pdp, |
1283 | .dumpit = gtp_genl_dump_pdp, | |
459aa660 PN |
1284 | .flags = GENL_ADMIN_PERM, |
1285 | }, | |
1286 | }; | |
1287 | ||
56989f6d | 1288 | static struct genl_family gtp_genl_family __ro_after_init = { |
489111e5 JB |
1289 | .name = "gtp", |
1290 | .version = 0, | |
1291 | .hdrsize = 0, | |
1292 | .maxattr = GTPA_MAX, | |
3b0f31f2 | 1293 | .policy = gtp_genl_policy, |
489111e5 JB |
1294 | .netnsok = true, |
1295 | .module = THIS_MODULE, | |
1296 | .ops = gtp_genl_ops, | |
1297 | .n_ops = ARRAY_SIZE(gtp_genl_ops), | |
1298 | }; | |
1299 | ||
459aa660 PN |
1300 | static int __net_init gtp_net_init(struct net *net) |
1301 | { | |
1302 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1303 | ||
1304 | INIT_LIST_HEAD(&gn->gtp_dev_list); | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | static void __net_exit gtp_net_exit(struct net *net) | |
1309 | { | |
1310 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1311 | struct gtp_dev *gtp; | |
1312 | LIST_HEAD(list); | |
1313 | ||
1314 | rtnl_lock(); | |
1315 | list_for_each_entry(gtp, &gn->gtp_dev_list, list) | |
1316 | gtp_dellink(gtp->dev, &list); | |
1317 | ||
1318 | unregister_netdevice_many(&list); | |
1319 | rtnl_unlock(); | |
1320 | } | |
1321 | ||
1322 | static struct pernet_operations gtp_net_ops = { | |
1323 | .init = gtp_net_init, | |
1324 | .exit = gtp_net_exit, | |
1325 | .id = >p_net_id, | |
1326 | .size = sizeof(struct gtp_net), | |
1327 | }; | |
1328 | ||
1329 | static int __init gtp_init(void) | |
1330 | { | |
1331 | int err; | |
1332 | ||
1333 | get_random_bytes(>p_h_initval, sizeof(gtp_h_initval)); | |
1334 | ||
1335 | err = rtnl_link_register(>p_link_ops); | |
1336 | if (err < 0) | |
1337 | goto error_out; | |
1338 | ||
489111e5 | 1339 | err = genl_register_family(>p_genl_family); |
459aa660 PN |
1340 | if (err < 0) |
1341 | goto unreg_rtnl_link; | |
1342 | ||
1343 | err = register_pernet_subsys(>p_net_ops); | |
1344 | if (err < 0) | |
1345 | goto unreg_genl_family; | |
1346 | ||
5b5e0928 | 1347 | pr_info("GTP module loaded (pdp ctx size %zd bytes)\n", |
459aa660 PN |
1348 | sizeof(struct pdp_ctx)); |
1349 | return 0; | |
1350 | ||
1351 | unreg_genl_family: | |
1352 | genl_unregister_family(>p_genl_family); | |
1353 | unreg_rtnl_link: | |
1354 | rtnl_link_unregister(>p_link_ops); | |
1355 | error_out: | |
1356 | pr_err("error loading GTP module loaded\n"); | |
1357 | return err; | |
1358 | } | |
1359 | late_initcall(gtp_init); | |
1360 | ||
1361 | static void __exit gtp_fini(void) | |
1362 | { | |
1363 | unregister_pernet_subsys(>p_net_ops); | |
1364 | genl_unregister_family(>p_genl_family); | |
1365 | rtnl_link_unregister(>p_link_ops); | |
1366 | ||
1367 | pr_info("GTP module unloaded\n"); | |
1368 | } | |
1369 | module_exit(gtp_fini); | |
1370 | ||
1371 | MODULE_LICENSE("GPL"); | |
1372 | MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>"); | |
1373 | MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic"); | |
1374 | MODULE_ALIAS_RTNL_LINK("gtp"); | |
ab729823 | 1375 | MODULE_ALIAS_GENL_FAMILY("gtp"); |