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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 | ||
1788b856 | 288 | static void __gtp_encap_destroy(struct sock *sk) |
459aa660 | 289 | { |
1e3a3abd | 290 | struct gtp_dev *gtp; |
459aa660 | 291 | |
e198987e TY |
292 | lock_sock(sk); |
293 | gtp = sk->sk_user_data; | |
1e3a3abd | 294 | if (gtp) { |
1788b856 TY |
295 | if (gtp->sk0 == sk) |
296 | gtp->sk0 = NULL; | |
297 | else | |
298 | gtp->sk1u = NULL; | |
1e3a3abd AS |
299 | udp_sk(sk)->encap_type = 0; |
300 | rcu_assign_sk_user_data(sk, NULL); | |
301 | sock_put(sk); | |
302 | } | |
e198987e | 303 | release_sock(sk); |
459aa660 PN |
304 | } |
305 | ||
1788b856 TY |
306 | static void gtp_encap_destroy(struct sock *sk) |
307 | { | |
308 | rtnl_lock(); | |
309 | __gtp_encap_destroy(sk); | |
310 | rtnl_unlock(); | |
311 | } | |
312 | ||
1e3a3abd | 313 | static void gtp_encap_disable_sock(struct sock *sk) |
459aa660 | 314 | { |
1e3a3abd AS |
315 | if (!sk) |
316 | return; | |
459aa660 | 317 | |
1788b856 | 318 | __gtp_encap_destroy(sk); |
1e3a3abd AS |
319 | } |
320 | ||
321 | static void gtp_encap_disable(struct gtp_dev *gtp) | |
322 | { | |
323 | gtp_encap_disable_sock(gtp->sk0); | |
324 | gtp_encap_disable_sock(gtp->sk1u); | |
459aa660 PN |
325 | } |
326 | ||
327 | /* UDP encapsulation receive handler. See net/ipv4/udp.c. | |
328 | * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket. | |
329 | */ | |
330 | static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
331 | { | |
459aa660 | 332 | struct gtp_dev *gtp; |
5b171f9c | 333 | int ret = 0; |
459aa660 PN |
334 | |
335 | gtp = rcu_dereference_sk_user_data(sk); | |
336 | if (!gtp) | |
337 | return 1; | |
338 | ||
339 | netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); | |
340 | ||
459aa660 PN |
341 | switch (udp_sk(sk)->encap_type) { |
342 | case UDP_ENCAP_GTP0: | |
343 | netdev_dbg(gtp->dev, "received GTP0 packet\n"); | |
101cfbc1 | 344 | ret = gtp0_udp_encap_recv(gtp, skb); |
459aa660 PN |
345 | break; |
346 | case UDP_ENCAP_GTP1U: | |
347 | netdev_dbg(gtp->dev, "received GTP1U packet\n"); | |
101cfbc1 | 348 | ret = gtp1u_udp_encap_recv(gtp, skb); |
459aa660 PN |
349 | break; |
350 | default: | |
351 | ret = -1; /* Shouldn't happen. */ | |
352 | } | |
353 | ||
354 | switch (ret) { | |
355 | case 1: | |
356 | netdev_dbg(gtp->dev, "pass up to the process\n"); | |
5b171f9c | 357 | break; |
459aa660 | 358 | case 0: |
459aa660 PN |
359 | break; |
360 | case -1: | |
361 | netdev_dbg(gtp->dev, "GTP packet has been dropped\n"); | |
362 | kfree_skb(skb); | |
5b171f9c AS |
363 | ret = 0; |
364 | break; | |
459aa660 PN |
365 | } |
366 | ||
5b171f9c | 367 | return ret; |
459aa660 PN |
368 | } |
369 | ||
370 | static int gtp_dev_init(struct net_device *dev) | |
371 | { | |
372 | struct gtp_dev *gtp = netdev_priv(dev); | |
373 | ||
374 | gtp->dev = dev; | |
375 | ||
790cb2eb | 376 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
459aa660 PN |
377 | if (!dev->tstats) |
378 | return -ENOMEM; | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static void gtp_dev_uninit(struct net_device *dev) | |
384 | { | |
385 | struct gtp_dev *gtp = netdev_priv(dev); | |
386 | ||
387 | gtp_encap_disable(gtp); | |
388 | free_percpu(dev->tstats); | |
389 | } | |
390 | ||
101cfbc1 AS |
391 | static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4, |
392 | const struct sock *sk, | |
393 | __be32 daddr) | |
459aa660 PN |
394 | { |
395 | memset(fl4, 0, sizeof(*fl4)); | |
396 | fl4->flowi4_oif = sk->sk_bound_dev_if; | |
397 | fl4->daddr = daddr; | |
398 | fl4->saddr = inet_sk(sk)->inet_saddr; | |
399 | fl4->flowi4_tos = RT_CONN_FLAGS(sk); | |
400 | fl4->flowi4_proto = sk->sk_protocol; | |
401 | ||
101cfbc1 | 402 | return ip_route_output_key(sock_net(sk), fl4); |
459aa660 PN |
403 | } |
404 | ||
405 | static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) | |
406 | { | |
407 | int payload_len = skb->len; | |
408 | struct gtp0_header *gtp0; | |
409 | ||
d58ff351 | 410 | gtp0 = skb_push(skb, sizeof(*gtp0)); |
459aa660 PN |
411 | |
412 | gtp0->flags = 0x1e; /* v0, GTP-non-prime. */ | |
413 | gtp0->type = GTP_TPDU; | |
414 | gtp0->length = htons(payload_len); | |
415 | gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff); | |
416 | gtp0->flow = htons(pctx->u.v0.flow); | |
417 | gtp0->number = 0xff; | |
418 | gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff; | |
419 | gtp0->tid = cpu_to_be64(pctx->u.v0.tid); | |
420 | } | |
421 | ||
422 | static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) | |
423 | { | |
424 | int payload_len = skb->len; | |
425 | struct gtp1_header *gtp1; | |
426 | ||
d58ff351 | 427 | gtp1 = skb_push(skb, sizeof(*gtp1)); |
459aa660 PN |
428 | |
429 | /* Bits 8 7 6 5 4 3 2 1 | |
430 | * +--+--+--+--+--+--+--+--+ | |
d928be81 | 431 | * |version |PT| 0| E| S|PN| |
459aa660 PN |
432 | * +--+--+--+--+--+--+--+--+ |
433 | * 0 0 1 1 1 0 0 0 | |
434 | */ | |
d928be81 | 435 | gtp1->flags = 0x30; /* v1, GTP-non-prime. */ |
459aa660 PN |
436 | gtp1->type = GTP_TPDU; |
437 | gtp1->length = htons(payload_len); | |
438 | gtp1->tid = htonl(pctx->u.v1.o_tei); | |
439 | ||
440 | /* TODO: Suppport for extension header, sequence number and N-PDU. | |
441 | * Update the length field if any of them is available. | |
442 | */ | |
443 | } | |
444 | ||
445 | struct gtp_pktinfo { | |
446 | struct sock *sk; | |
447 | struct iphdr *iph; | |
448 | struct flowi4 fl4; | |
449 | struct rtable *rt; | |
450 | struct pdp_ctx *pctx; | |
451 | struct net_device *dev; | |
452 | __be16 gtph_port; | |
453 | }; | |
454 | ||
455 | static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo) | |
456 | { | |
457 | switch (pktinfo->pctx->gtp_version) { | |
458 | case GTP_V0: | |
459 | pktinfo->gtph_port = htons(GTP0_PORT); | |
460 | gtp0_push_header(skb, pktinfo->pctx); | |
461 | break; | |
462 | case GTP_V1: | |
463 | pktinfo->gtph_port = htons(GTP1U_PORT); | |
464 | gtp1_push_header(skb, pktinfo->pctx); | |
465 | break; | |
466 | } | |
467 | } | |
468 | ||
469 | static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, | |
470 | struct sock *sk, struct iphdr *iph, | |
471 | struct pdp_ctx *pctx, struct rtable *rt, | |
472 | struct flowi4 *fl4, | |
473 | struct net_device *dev) | |
474 | { | |
475 | pktinfo->sk = sk; | |
476 | pktinfo->iph = iph; | |
477 | pktinfo->pctx = pctx; | |
478 | pktinfo->rt = rt; | |
479 | pktinfo->fl4 = *fl4; | |
480 | pktinfo->dev = dev; | |
481 | } | |
482 | ||
483 | static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, | |
484 | struct gtp_pktinfo *pktinfo) | |
485 | { | |
486 | struct gtp_dev *gtp = netdev_priv(dev); | |
487 | struct pdp_ctx *pctx; | |
488 | struct rtable *rt; | |
489 | struct flowi4 fl4; | |
490 | struct iphdr *iph; | |
459aa660 PN |
491 | __be16 df; |
492 | int mtu; | |
493 | ||
494 | /* Read the IP destination address and resolve the PDP context. | |
495 | * Prepend PDP header with TEI/TID from PDP ctx. | |
496 | */ | |
497 | iph = ip_hdr(skb); | |
91ed81f9 JB |
498 | if (gtp->role == GTP_ROLE_SGSN) |
499 | pctx = ipv4_pdp_find(gtp, iph->saddr); | |
500 | else | |
501 | pctx = ipv4_pdp_find(gtp, iph->daddr); | |
502 | ||
459aa660 PN |
503 | if (!pctx) { |
504 | netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", | |
505 | &iph->daddr); | |
506 | return -ENOENT; | |
507 | } | |
508 | netdev_dbg(dev, "found PDP context %p\n", pctx); | |
509 | ||
ae6336b5 | 510 | rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr); |
459aa660 PN |
511 | if (IS_ERR(rt)) { |
512 | netdev_dbg(dev, "no route to SSGN %pI4\n", | |
ae6336b5 | 513 | &pctx->peer_addr_ip4.s_addr); |
459aa660 PN |
514 | dev->stats.tx_carrier_errors++; |
515 | goto err; | |
516 | } | |
517 | ||
518 | if (rt->dst.dev == dev) { | |
519 | netdev_dbg(dev, "circular route to SSGN %pI4\n", | |
ae6336b5 | 520 | &pctx->peer_addr_ip4.s_addr); |
459aa660 PN |
521 | dev->stats.collisions++; |
522 | goto err_rt; | |
523 | } | |
524 | ||
525 | skb_dst_drop(skb); | |
526 | ||
527 | /* This is similar to tnl_update_pmtu(). */ | |
528 | df = iph->frag_off; | |
529 | if (df) { | |
530 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - | |
531 | sizeof(struct iphdr) - sizeof(struct udphdr); | |
532 | switch (pctx->gtp_version) { | |
533 | case GTP_V0: | |
534 | mtu -= sizeof(struct gtp0_header); | |
535 | break; | |
536 | case GTP_V1: | |
537 | mtu -= sizeof(struct gtp1_header); | |
538 | break; | |
539 | } | |
540 | } else { | |
541 | mtu = dst_mtu(&rt->dst); | |
542 | } | |
543 | ||
544 | rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu); | |
545 | ||
546 | if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) && | |
547 | mtu < ntohs(iph->tot_len)) { | |
548 | netdev_dbg(dev, "packet too big, fragmentation needed\n"); | |
549 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
550 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
551 | htonl(mtu)); | |
552 | goto err_rt; | |
553 | } | |
554 | ||
101cfbc1 | 555 | gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev); |
459aa660 PN |
556 | gtp_push_header(skb, pktinfo); |
557 | ||
558 | return 0; | |
559 | err_rt: | |
560 | ip_rt_put(rt); | |
561 | err: | |
562 | return -EBADMSG; | |
563 | } | |
564 | ||
565 | static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) | |
566 | { | |
567 | unsigned int proto = ntohs(skb->protocol); | |
568 | struct gtp_pktinfo pktinfo; | |
569 | int err; | |
570 | ||
571 | /* Ensure there is sufficient headroom. */ | |
572 | if (skb_cow_head(skb, dev->needed_headroom)) | |
573 | goto tx_err; | |
574 | ||
575 | skb_reset_inner_headers(skb); | |
576 | ||
577 | /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */ | |
578 | rcu_read_lock(); | |
579 | switch (proto) { | |
580 | case ETH_P_IP: | |
581 | err = gtp_build_skb_ip4(skb, dev, &pktinfo); | |
582 | break; | |
583 | default: | |
584 | err = -EOPNOTSUPP; | |
585 | break; | |
586 | } | |
587 | rcu_read_unlock(); | |
588 | ||
589 | if (err < 0) | |
590 | goto tx_err; | |
591 | ||
592 | switch (proto) { | |
593 | case ETH_P_IP: | |
594 | netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n", | |
595 | &pktinfo.iph->saddr, &pktinfo.iph->daddr); | |
596 | udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, | |
597 | pktinfo.fl4.saddr, pktinfo.fl4.daddr, | |
598 | pktinfo.iph->tos, | |
599 | ip4_dst_hoplimit(&pktinfo.rt->dst), | |
c6ce1d08 | 600 | 0, |
459aa660 PN |
601 | pktinfo.gtph_port, pktinfo.gtph_port, |
602 | true, false); | |
603 | break; | |
604 | } | |
605 | ||
606 | return NETDEV_TX_OK; | |
607 | tx_err: | |
608 | dev->stats.tx_errors++; | |
609 | dev_kfree_skb(skb); | |
610 | return NETDEV_TX_OK; | |
611 | } | |
612 | ||
613 | static const struct net_device_ops gtp_netdev_ops = { | |
614 | .ndo_init = gtp_dev_init, | |
615 | .ndo_uninit = gtp_dev_uninit, | |
616 | .ndo_start_xmit = gtp_dev_xmit, | |
617 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
618 | }; | |
619 | ||
620 | static void gtp_link_setup(struct net_device *dev) | |
621 | { | |
622 | dev->netdev_ops = >p_netdev_ops; | |
cf124db5 | 623 | dev->needs_free_netdev = true; |
459aa660 PN |
624 | |
625 | dev->hard_header_len = 0; | |
626 | dev->addr_len = 0; | |
627 | ||
628 | /* Zero header length. */ | |
629 | dev->type = ARPHRD_NONE; | |
630 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
631 | ||
632 | dev->priv_flags |= IFF_NO_QUEUE; | |
633 | dev->features |= NETIF_F_LLTX; | |
634 | netif_keep_dst(dev); | |
635 | ||
636 | /* Assume largest header, ie. GTPv0. */ | |
637 | dev->needed_headroom = LL_MAX_HEADER + | |
638 | sizeof(struct iphdr) + | |
639 | sizeof(struct udphdr) + | |
640 | sizeof(struct gtp0_header); | |
641 | } | |
642 | ||
643 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); | |
644 | static void gtp_hashtable_free(struct gtp_dev *gtp); | |
1e3a3abd | 645 | static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]); |
459aa660 PN |
646 | |
647 | static int gtp_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
648 | struct nlattr *tb[], struct nlattr *data[], |
649 | struct netlink_ext_ack *extack) | |
459aa660 | 650 | { |
459aa660 PN |
651 | struct gtp_dev *gtp; |
652 | struct gtp_net *gn; | |
1e3a3abd | 653 | int hashsize, err; |
459aa660 | 654 | |
1e3a3abd | 655 | if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1]) |
459aa660 PN |
656 | return -EINVAL; |
657 | ||
658 | gtp = netdev_priv(dev); | |
659 | ||
1e3a3abd | 660 | err = gtp_encap_enable(gtp, data); |
459aa660 | 661 | if (err < 0) |
1e3a3abd | 662 | return err; |
459aa660 PN |
663 | |
664 | if (!data[IFLA_GTP_PDP_HASHSIZE]) | |
665 | hashsize = 1024; | |
666 | else | |
667 | hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]); | |
668 | ||
669 | err = gtp_hashtable_new(gtp, hashsize); | |
670 | if (err < 0) | |
671 | goto out_encap; | |
672 | ||
673 | err = register_netdevice(dev); | |
674 | if (err < 0) { | |
675 | netdev_dbg(dev, "failed to register new netdev %d\n", err); | |
676 | goto out_hashtable; | |
677 | } | |
678 | ||
679 | gn = net_generic(dev_net(dev), gtp_net_id); | |
680 | list_add_rcu(>p->list, &gn->gtp_dev_list); | |
681 | ||
682 | netdev_dbg(dev, "registered new GTP interface\n"); | |
683 | ||
684 | return 0; | |
685 | ||
686 | out_hashtable: | |
687 | gtp_hashtable_free(gtp); | |
688 | out_encap: | |
689 | gtp_encap_disable(gtp); | |
459aa660 PN |
690 | return err; |
691 | } | |
692 | ||
693 | static void gtp_dellink(struct net_device *dev, struct list_head *head) | |
694 | { | |
695 | struct gtp_dev *gtp = netdev_priv(dev); | |
696 | ||
459aa660 PN |
697 | gtp_hashtable_free(gtp); |
698 | list_del_rcu(>p->list); | |
699 | unregister_netdevice_queue(dev, head); | |
700 | } | |
701 | ||
702 | static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = { | |
703 | [IFLA_GTP_FD0] = { .type = NLA_U32 }, | |
704 | [IFLA_GTP_FD1] = { .type = NLA_U32 }, | |
705 | [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 }, | |
91ed81f9 | 706 | [IFLA_GTP_ROLE] = { .type = NLA_U32 }, |
459aa660 PN |
707 | }; |
708 | ||
a8b8a889 MS |
709 | static int gtp_validate(struct nlattr *tb[], struct nlattr *data[], |
710 | struct netlink_ext_ack *extack) | |
459aa660 PN |
711 | { |
712 | if (!data) | |
713 | return -EINVAL; | |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | static size_t gtp_get_size(const struct net_device *dev) | |
719 | { | |
720 | return nla_total_size(sizeof(__u32)); /* IFLA_GTP_PDP_HASHSIZE */ | |
721 | } | |
722 | ||
723 | static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
724 | { | |
725 | struct gtp_dev *gtp = netdev_priv(dev); | |
726 | ||
727 | if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size)) | |
728 | goto nla_put_failure; | |
729 | ||
730 | return 0; | |
731 | ||
732 | nla_put_failure: | |
733 | return -EMSGSIZE; | |
734 | } | |
735 | ||
736 | static struct rtnl_link_ops gtp_link_ops __read_mostly = { | |
737 | .kind = "gtp", | |
738 | .maxtype = IFLA_GTP_MAX, | |
739 | .policy = gtp_policy, | |
740 | .priv_size = sizeof(struct gtp_dev), | |
741 | .setup = gtp_link_setup, | |
742 | .validate = gtp_validate, | |
743 | .newlink = gtp_newlink, | |
744 | .dellink = gtp_dellink, | |
745 | .get_size = gtp_get_size, | |
746 | .fill_info = gtp_fill_info, | |
747 | }; | |
748 | ||
459aa660 PN |
749 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) |
750 | { | |
751 | int i; | |
752 | ||
6da2ec56 KC |
753 | gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head), |
754 | GFP_KERNEL); | |
459aa660 PN |
755 | if (gtp->addr_hash == NULL) |
756 | return -ENOMEM; | |
757 | ||
6da2ec56 KC |
758 | gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head), |
759 | GFP_KERNEL); | |
459aa660 PN |
760 | if (gtp->tid_hash == NULL) |
761 | goto err1; | |
762 | ||
763 | gtp->hash_size = hsize; | |
764 | ||
765 | for (i = 0; i < hsize; i++) { | |
766 | INIT_HLIST_HEAD(>p->addr_hash[i]); | |
767 | INIT_HLIST_HEAD(>p->tid_hash[i]); | |
768 | } | |
769 | return 0; | |
770 | err1: | |
771 | kfree(gtp->addr_hash); | |
772 | return -ENOMEM; | |
773 | } | |
774 | ||
775 | static void gtp_hashtable_free(struct gtp_dev *gtp) | |
776 | { | |
777 | struct pdp_ctx *pctx; | |
778 | int i; | |
779 | ||
6b5e2e74 AS |
780 | for (i = 0; i < gtp->hash_size; i++) |
781 | hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) | |
782 | pdp_context_delete(pctx); | |
783 | ||
459aa660 PN |
784 | synchronize_rcu(); |
785 | kfree(gtp->addr_hash); | |
786 | kfree(gtp->tid_hash); | |
787 | } | |
788 | ||
1e3a3abd AS |
789 | static struct sock *gtp_encap_enable_socket(int fd, int type, |
790 | struct gtp_dev *gtp) | |
459aa660 PN |
791 | { |
792 | struct udp_tunnel_sock_cfg tuncfg = {NULL}; | |
1e3a3abd AS |
793 | struct socket *sock; |
794 | struct sock *sk; | |
459aa660 PN |
795 | int err; |
796 | ||
1e3a3abd | 797 | pr_debug("enable gtp on %d, %d\n", fd, type); |
459aa660 | 798 | |
1e3a3abd AS |
799 | sock = sockfd_lookup(fd, &err); |
800 | if (!sock) { | |
801 | pr_debug("gtp socket fd=%d not found\n", fd); | |
802 | return NULL; | |
459aa660 PN |
803 | } |
804 | ||
1e3a3abd AS |
805 | if (sock->sk->sk_protocol != IPPROTO_UDP) { |
806 | pr_debug("socket fd=%d not UDP\n", fd); | |
807 | sk = ERR_PTR(-EINVAL); | |
808 | goto out_sock; | |
459aa660 PN |
809 | } |
810 | ||
e198987e TY |
811 | lock_sock(sock->sk); |
812 | if (sock->sk->sk_user_data) { | |
1e3a3abd AS |
813 | sk = ERR_PTR(-EBUSY); |
814 | goto out_sock; | |
459aa660 PN |
815 | } |
816 | ||
1e3a3abd AS |
817 | sk = sock->sk; |
818 | sock_hold(sk); | |
459aa660 PN |
819 | |
820 | tuncfg.sk_user_data = gtp; | |
1e3a3abd | 821 | tuncfg.encap_type = type; |
459aa660 PN |
822 | tuncfg.encap_rcv = gtp_encap_recv; |
823 | tuncfg.encap_destroy = gtp_encap_destroy; | |
824 | ||
1e3a3abd | 825 | setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg); |
459aa660 | 826 | |
1e3a3abd | 827 | out_sock: |
e198987e | 828 | release_sock(sock->sk); |
1e3a3abd AS |
829 | sockfd_put(sock); |
830 | return sk; | |
831 | } | |
459aa660 | 832 | |
1e3a3abd AS |
833 | static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]) |
834 | { | |
835 | struct sock *sk1u = NULL; | |
836 | struct sock *sk0 = NULL; | |
91ed81f9 | 837 | unsigned int role = GTP_ROLE_GGSN; |
1e3a3abd AS |
838 | |
839 | if (data[IFLA_GTP_FD0]) { | |
840 | u32 fd0 = nla_get_u32(data[IFLA_GTP_FD0]); | |
841 | ||
842 | sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp); | |
843 | if (IS_ERR(sk0)) | |
844 | return PTR_ERR(sk0); | |
845 | } | |
846 | ||
847 | if (data[IFLA_GTP_FD1]) { | |
848 | u32 fd1 = nla_get_u32(data[IFLA_GTP_FD1]); | |
849 | ||
850 | sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp); | |
851 | if (IS_ERR(sk1u)) { | |
852 | if (sk0) | |
853 | gtp_encap_disable_sock(sk0); | |
854 | return PTR_ERR(sk1u); | |
855 | } | |
856 | } | |
857 | ||
91ed81f9 JB |
858 | if (data[IFLA_GTP_ROLE]) { |
859 | role = nla_get_u32(data[IFLA_GTP_ROLE]); | |
e30155fd TY |
860 | if (role > GTP_ROLE_SGSN) { |
861 | if (sk0) | |
862 | gtp_encap_disable_sock(sk0); | |
863 | if (sk1u) | |
864 | gtp_encap_disable_sock(sk1u); | |
91ed81f9 | 865 | return -EINVAL; |
e30155fd | 866 | } |
91ed81f9 JB |
867 | } |
868 | ||
1e3a3abd AS |
869 | gtp->sk0 = sk0; |
870 | gtp->sk1u = sk1u; | |
91ed81f9 | 871 | gtp->role = role; |
1e3a3abd AS |
872 | |
873 | return 0; | |
459aa660 PN |
874 | } |
875 | ||
3fb94617 | 876 | static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[]) |
459aa660 | 877 | { |
3fb94617 AS |
878 | struct gtp_dev *gtp = NULL; |
879 | struct net_device *dev; | |
880 | struct net *net; | |
459aa660 | 881 | |
3fb94617 AS |
882 | /* Examine the link attributes and figure out which network namespace |
883 | * we are talking about. | |
884 | */ | |
885 | if (nla[GTPA_NET_NS_FD]) | |
886 | net = get_net_ns_by_fd(nla_get_u32(nla[GTPA_NET_NS_FD])); | |
887 | else | |
888 | net = get_net(src_net); | |
889 | ||
890 | if (IS_ERR(net)) | |
891 | return NULL; | |
892 | ||
893 | /* Check if there's an existing gtpX device to configure */ | |
894 | dev = dev_get_by_index_rcu(net, nla_get_u32(nla[GTPA_LINK])); | |
65d786c2 | 895 | if (dev && dev->netdev_ops == >p_netdev_ops) |
3fb94617 AS |
896 | gtp = netdev_priv(dev); |
897 | ||
898 | put_net(net); | |
899 | return gtp; | |
459aa660 PN |
900 | } |
901 | ||
902 | static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) | |
903 | { | |
904 | pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); | |
905 | pctx->af = AF_INET; | |
ae6336b5 JB |
906 | pctx->peer_addr_ip4.s_addr = |
907 | nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]); | |
459aa660 PN |
908 | pctx->ms_addr_ip4.s_addr = |
909 | nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
910 | ||
911 | switch (pctx->gtp_version) { | |
912 | case GTP_V0: | |
913 | /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow | |
914 | * label needs to be the same for uplink and downlink packets, | |
915 | * so let's annotate this. | |
916 | */ | |
917 | pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]); | |
918 | pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]); | |
919 | break; | |
920 | case GTP_V1: | |
921 | pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]); | |
922 | pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]); | |
923 | break; | |
924 | default: | |
925 | break; | |
926 | } | |
927 | } | |
928 | ||
101cfbc1 AS |
929 | static int ipv4_pdp_add(struct gtp_dev *gtp, struct sock *sk, |
930 | struct genl_info *info) | |
459aa660 | 931 | { |
3fb94617 | 932 | struct net_device *dev = gtp->dev; |
459aa660 PN |
933 | u32 hash_ms, hash_tid = 0; |
934 | struct pdp_ctx *pctx; | |
935 | bool found = false; | |
936 | __be32 ms_addr; | |
937 | ||
938 | ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
939 | hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size; | |
940 | ||
941 | hlist_for_each_entry_rcu(pctx, >p->addr_hash[hash_ms], hlist_addr) { | |
942 | if (pctx->ms_addr_ip4.s_addr == ms_addr) { | |
943 | found = true; | |
944 | break; | |
945 | } | |
946 | } | |
947 | ||
948 | if (found) { | |
949 | if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) | |
950 | return -EEXIST; | |
951 | if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE) | |
952 | return -EOPNOTSUPP; | |
953 | ||
954 | ipv4_pdp_fill(pctx, info); | |
955 | ||
956 | if (pctx->gtp_version == GTP_V0) | |
957 | netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n", | |
958 | pctx->u.v0.tid, pctx); | |
959 | else if (pctx->gtp_version == GTP_V1) | |
960 | netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n", | |
961 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); | |
962 | ||
963 | return 0; | |
964 | ||
965 | } | |
966 | ||
3f167e19 | 967 | pctx = kmalloc(sizeof(*pctx), GFP_ATOMIC); |
459aa660 PN |
968 | if (pctx == NULL) |
969 | return -ENOMEM; | |
970 | ||
101cfbc1 AS |
971 | sock_hold(sk); |
972 | pctx->sk = sk; | |
5b171f9c | 973 | pctx->dev = gtp->dev; |
459aa660 PN |
974 | ipv4_pdp_fill(pctx, info); |
975 | atomic_set(&pctx->tx_seq, 0); | |
976 | ||
977 | switch (pctx->gtp_version) { | |
978 | case GTP_V0: | |
979 | /* TS 09.60: "The flow label identifies unambiguously a GTP | |
980 | * flow.". We use the tid for this instead, I cannot find a | |
981 | * situation in which this doesn't unambiguosly identify the | |
982 | * PDP context. | |
983 | */ | |
984 | hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size; | |
985 | break; | |
986 | case GTP_V1: | |
987 | hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size; | |
988 | break; | |
989 | } | |
990 | ||
991 | hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]); | |
992 | hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]); | |
993 | ||
994 | switch (pctx->gtp_version) { | |
995 | case GTP_V0: | |
996 | netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n", | |
ae6336b5 | 997 | pctx->u.v0.tid, &pctx->peer_addr_ip4, |
459aa660 PN |
998 | &pctx->ms_addr_ip4, pctx); |
999 | break; | |
1000 | case GTP_V1: | |
1001 | netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n", | |
1002 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, | |
ae6336b5 | 1003 | &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx); |
459aa660 PN |
1004 | break; |
1005 | } | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
101cfbc1 AS |
1010 | static void pdp_context_free(struct rcu_head *head) |
1011 | { | |
1012 | struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head); | |
1013 | ||
1014 | sock_put(pctx->sk); | |
1015 | kfree(pctx); | |
1016 | } | |
1017 | ||
6b5e2e74 AS |
1018 | static void pdp_context_delete(struct pdp_ctx *pctx) |
1019 | { | |
1020 | hlist_del_rcu(&pctx->hlist_tid); | |
1021 | hlist_del_rcu(&pctx->hlist_addr); | |
101cfbc1 | 1022 | call_rcu(&pctx->rcu_head, pdp_context_free); |
6b5e2e74 AS |
1023 | } |
1024 | ||
459aa660 PN |
1025 | static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) |
1026 | { | |
101cfbc1 | 1027 | unsigned int version; |
3fb94617 | 1028 | struct gtp_dev *gtp; |
101cfbc1 | 1029 | struct sock *sk; |
3fb94617 | 1030 | int err; |
459aa660 PN |
1031 | |
1032 | if (!info->attrs[GTPA_VERSION] || | |
1033 | !info->attrs[GTPA_LINK] || | |
ae6336b5 | 1034 | !info->attrs[GTPA_PEER_ADDRESS] || |
459aa660 PN |
1035 | !info->attrs[GTPA_MS_ADDRESS]) |
1036 | return -EINVAL; | |
1037 | ||
101cfbc1 AS |
1038 | version = nla_get_u32(info->attrs[GTPA_VERSION]); |
1039 | ||
1040 | switch (version) { | |
459aa660 PN |
1041 | case GTP_V0: |
1042 | if (!info->attrs[GTPA_TID] || | |
1043 | !info->attrs[GTPA_FLOW]) | |
1044 | return -EINVAL; | |
1045 | break; | |
1046 | case GTP_V1: | |
1047 | if (!info->attrs[GTPA_I_TEI] || | |
1048 | !info->attrs[GTPA_O_TEI]) | |
1049 | return -EINVAL; | |
1050 | break; | |
1051 | ||
1052 | default: | |
1053 | return -EINVAL; | |
1054 | } | |
1055 | ||
1788b856 | 1056 | rtnl_lock(); |
3fb94617 | 1057 | rcu_read_lock(); |
459aa660 | 1058 | |
3fb94617 AS |
1059 | gtp = gtp_find_dev(sock_net(skb->sk), info->attrs); |
1060 | if (!gtp) { | |
1061 | err = -ENODEV; | |
1062 | goto out_unlock; | |
27ee441a | 1063 | } |
459aa660 | 1064 | |
101cfbc1 AS |
1065 | if (version == GTP_V0) |
1066 | sk = gtp->sk0; | |
1067 | else if (version == GTP_V1) | |
1068 | sk = gtp->sk1u; | |
1069 | else | |
1070 | sk = NULL; | |
1071 | ||
1072 | if (!sk) { | |
1073 | err = -ENODEV; | |
1074 | goto out_unlock; | |
1075 | } | |
1076 | ||
1077 | err = ipv4_pdp_add(gtp, sk, info); | |
3fb94617 AS |
1078 | |
1079 | out_unlock: | |
1080 | rcu_read_unlock(); | |
1788b856 | 1081 | rtnl_unlock(); |
3fb94617 | 1082 | return err; |
459aa660 PN |
1083 | } |
1084 | ||
d9e2dd12 AS |
1085 | static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net, |
1086 | struct nlattr *nla[]) | |
459aa660 | 1087 | { |
459aa660 | 1088 | struct gtp_dev *gtp; |
459aa660 | 1089 | |
d9e2dd12 AS |
1090 | gtp = gtp_find_dev(net, nla); |
1091 | if (!gtp) | |
1092 | return ERR_PTR(-ENODEV); | |
459aa660 | 1093 | |
d9e2dd12 AS |
1094 | if (nla[GTPA_MS_ADDRESS]) { |
1095 | __be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]); | |
459aa660 | 1096 | |
d9e2dd12 AS |
1097 | return ipv4_pdp_find(gtp, ip); |
1098 | } else if (nla[GTPA_VERSION]) { | |
1099 | u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]); | |
1100 | ||
1101 | if (gtp_version == GTP_V0 && nla[GTPA_TID]) | |
1102 | return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID])); | |
1103 | else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI]) | |
1104 | return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI])); | |
27ee441a | 1105 | } |
459aa660 | 1106 | |
d9e2dd12 AS |
1107 | return ERR_PTR(-EINVAL); |
1108 | } | |
459aa660 | 1109 | |
d9e2dd12 AS |
1110 | static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[]) |
1111 | { | |
1112 | struct pdp_ctx *pctx; | |
459aa660 | 1113 | |
d9e2dd12 AS |
1114 | if (nla[GTPA_LINK]) |
1115 | pctx = gtp_find_pdp_by_link(net, nla); | |
1116 | else | |
1117 | pctx = ERR_PTR(-EINVAL); | |
1118 | ||
1119 | if (!pctx) | |
1120 | pctx = ERR_PTR(-ENOENT); | |
1121 | ||
1122 | return pctx; | |
1123 | } | |
1124 | ||
1125 | static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) | |
1126 | { | |
1127 | struct pdp_ctx *pctx; | |
1128 | int err = 0; | |
1129 | ||
1130 | if (!info->attrs[GTPA_VERSION]) | |
1131 | return -EINVAL; | |
1132 | ||
1133 | rcu_read_lock(); | |
1134 | ||
1135 | pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); | |
1136 | if (IS_ERR(pctx)) { | |
1137 | err = PTR_ERR(pctx); | |
3fb94617 AS |
1138 | goto out_unlock; |
1139 | } | |
459aa660 PN |
1140 | |
1141 | if (pctx->gtp_version == GTP_V0) | |
d9e2dd12 | 1142 | netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n", |
459aa660 PN |
1143 | pctx->u.v0.tid, pctx); |
1144 | else if (pctx->gtp_version == GTP_V1) | |
d9e2dd12 | 1145 | netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n", |
459aa660 PN |
1146 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); |
1147 | ||
6b5e2e74 | 1148 | pdp_context_delete(pctx); |
459aa660 | 1149 | |
3fb94617 AS |
1150 | out_unlock: |
1151 | rcu_read_unlock(); | |
1152 | return err; | |
459aa660 PN |
1153 | } |
1154 | ||
489111e5 | 1155 | static struct genl_family gtp_genl_family; |
459aa660 PN |
1156 | |
1157 | static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, | |
1158 | u32 type, struct pdp_ctx *pctx) | |
1159 | { | |
1160 | void *genlh; | |
1161 | ||
1162 | genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, 0, | |
1163 | type); | |
1164 | if (genlh == NULL) | |
1165 | goto nlmsg_failure; | |
1166 | ||
1167 | if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) || | |
ae6336b5 | 1168 | nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) || |
459aa660 PN |
1169 | nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr)) |
1170 | goto nla_put_failure; | |
1171 | ||
1172 | switch (pctx->gtp_version) { | |
1173 | case GTP_V0: | |
1174 | if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) || | |
1175 | nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow)) | |
1176 | goto nla_put_failure; | |
1177 | break; | |
1178 | case GTP_V1: | |
1179 | if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) || | |
1180 | nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei)) | |
1181 | goto nla_put_failure; | |
1182 | break; | |
1183 | } | |
1184 | genlmsg_end(skb, genlh); | |
1185 | return 0; | |
1186 | ||
1187 | nlmsg_failure: | |
1188 | nla_put_failure: | |
1189 | genlmsg_cancel(skb, genlh); | |
1190 | return -EMSGSIZE; | |
1191 | } | |
1192 | ||
1193 | static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) | |
1194 | { | |
1195 | struct pdp_ctx *pctx = NULL; | |
459aa660 | 1196 | struct sk_buff *skb2; |
459aa660 PN |
1197 | int err; |
1198 | ||
d9e2dd12 | 1199 | if (!info->attrs[GTPA_VERSION]) |
459aa660 | 1200 | return -EINVAL; |
459aa660 | 1201 | |
3fb94617 | 1202 | rcu_read_lock(); |
459aa660 | 1203 | |
d9e2dd12 AS |
1204 | pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); |
1205 | if (IS_ERR(pctx)) { | |
1206 | err = PTR_ERR(pctx); | |
459aa660 PN |
1207 | goto err_unlock; |
1208 | } | |
1209 | ||
1210 | skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); | |
1211 | if (skb2 == NULL) { | |
1212 | err = -ENOMEM; | |
1213 | goto err_unlock; | |
1214 | } | |
1215 | ||
1216 | err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, | |
1217 | info->snd_seq, info->nlhdr->nlmsg_type, pctx); | |
1218 | if (err < 0) | |
1219 | goto err_unlock_free; | |
1220 | ||
1221 | rcu_read_unlock(); | |
1222 | return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid); | |
1223 | ||
1224 | err_unlock_free: | |
1225 | kfree_skb(skb2); | |
1226 | err_unlock: | |
1227 | rcu_read_unlock(); | |
1228 | return err; | |
1229 | } | |
1230 | ||
1231 | static int gtp_genl_dump_pdp(struct sk_buff *skb, | |
1232 | struct netlink_callback *cb) | |
1233 | { | |
1234 | struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp; | |
1235 | struct net *net = sock_net(skb->sk); | |
1236 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1237 | unsigned long tid = cb->args[1]; | |
1238 | int i, k = cb->args[0], ret; | |
1239 | struct pdp_ctx *pctx; | |
1240 | ||
1241 | if (cb->args[4]) | |
1242 | return 0; | |
1243 | ||
1244 | list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { | |
1245 | if (last_gtp && last_gtp != gtp) | |
1246 | continue; | |
1247 | else | |
1248 | last_gtp = NULL; | |
1249 | ||
1250 | for (i = k; i < gtp->hash_size; i++) { | |
1251 | hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) { | |
1252 | if (tid && tid != pctx->u.tid) | |
1253 | continue; | |
1254 | else | |
1255 | tid = 0; | |
1256 | ||
1257 | ret = gtp_genl_fill_info(skb, | |
1258 | NETLINK_CB(cb->skb).portid, | |
1259 | cb->nlh->nlmsg_seq, | |
1260 | cb->nlh->nlmsg_type, pctx); | |
1261 | if (ret < 0) { | |
1262 | cb->args[0] = i; | |
1263 | cb->args[1] = pctx->u.tid; | |
1264 | cb->args[2] = (unsigned long)gtp; | |
1265 | goto out; | |
1266 | } | |
1267 | } | |
1268 | } | |
1269 | } | |
1270 | cb->args[4] = 1; | |
1271 | out: | |
1272 | return skb->len; | |
1273 | } | |
1274 | ||
5761917a | 1275 | static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = { |
459aa660 PN |
1276 | [GTPA_LINK] = { .type = NLA_U32, }, |
1277 | [GTPA_VERSION] = { .type = NLA_U32, }, | |
1278 | [GTPA_TID] = { .type = NLA_U64, }, | |
ae6336b5 | 1279 | [GTPA_PEER_ADDRESS] = { .type = NLA_U32, }, |
459aa660 PN |
1280 | [GTPA_MS_ADDRESS] = { .type = NLA_U32, }, |
1281 | [GTPA_FLOW] = { .type = NLA_U16, }, | |
1282 | [GTPA_NET_NS_FD] = { .type = NLA_U32, }, | |
1283 | [GTPA_I_TEI] = { .type = NLA_U32, }, | |
1284 | [GTPA_O_TEI] = { .type = NLA_U32, }, | |
1285 | }; | |
1286 | ||
1287 | static const struct genl_ops gtp_genl_ops[] = { | |
1288 | { | |
1289 | .cmd = GTP_CMD_NEWPDP, | |
ef6243ac | 1290 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 | 1291 | .doit = gtp_genl_new_pdp, |
459aa660 PN |
1292 | .flags = GENL_ADMIN_PERM, |
1293 | }, | |
1294 | { | |
1295 | .cmd = GTP_CMD_DELPDP, | |
ef6243ac | 1296 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 | 1297 | .doit = gtp_genl_del_pdp, |
459aa660 PN |
1298 | .flags = GENL_ADMIN_PERM, |
1299 | }, | |
1300 | { | |
1301 | .cmd = GTP_CMD_GETPDP, | |
ef6243ac | 1302 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 PN |
1303 | .doit = gtp_genl_get_pdp, |
1304 | .dumpit = gtp_genl_dump_pdp, | |
459aa660 PN |
1305 | .flags = GENL_ADMIN_PERM, |
1306 | }, | |
1307 | }; | |
1308 | ||
56989f6d | 1309 | static struct genl_family gtp_genl_family __ro_after_init = { |
489111e5 JB |
1310 | .name = "gtp", |
1311 | .version = 0, | |
1312 | .hdrsize = 0, | |
1313 | .maxattr = GTPA_MAX, | |
3b0f31f2 | 1314 | .policy = gtp_genl_policy, |
489111e5 JB |
1315 | .netnsok = true, |
1316 | .module = THIS_MODULE, | |
1317 | .ops = gtp_genl_ops, | |
1318 | .n_ops = ARRAY_SIZE(gtp_genl_ops), | |
1319 | }; | |
1320 | ||
459aa660 PN |
1321 | static int __net_init gtp_net_init(struct net *net) |
1322 | { | |
1323 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1324 | ||
1325 | INIT_LIST_HEAD(&gn->gtp_dev_list); | |
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | static void __net_exit gtp_net_exit(struct net *net) | |
1330 | { | |
1331 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1332 | struct gtp_dev *gtp; | |
1333 | LIST_HEAD(list); | |
1334 | ||
1335 | rtnl_lock(); | |
1336 | list_for_each_entry(gtp, &gn->gtp_dev_list, list) | |
1337 | gtp_dellink(gtp->dev, &list); | |
1338 | ||
1339 | unregister_netdevice_many(&list); | |
1340 | rtnl_unlock(); | |
1341 | } | |
1342 | ||
1343 | static struct pernet_operations gtp_net_ops = { | |
1344 | .init = gtp_net_init, | |
1345 | .exit = gtp_net_exit, | |
1346 | .id = >p_net_id, | |
1347 | .size = sizeof(struct gtp_net), | |
1348 | }; | |
1349 | ||
1350 | static int __init gtp_init(void) | |
1351 | { | |
1352 | int err; | |
1353 | ||
1354 | get_random_bytes(>p_h_initval, sizeof(gtp_h_initval)); | |
1355 | ||
1356 | err = rtnl_link_register(>p_link_ops); | |
1357 | if (err < 0) | |
1358 | goto error_out; | |
1359 | ||
489111e5 | 1360 | err = genl_register_family(>p_genl_family); |
459aa660 PN |
1361 | if (err < 0) |
1362 | goto unreg_rtnl_link; | |
1363 | ||
1364 | err = register_pernet_subsys(>p_net_ops); | |
1365 | if (err < 0) | |
1366 | goto unreg_genl_family; | |
1367 | ||
5b5e0928 | 1368 | pr_info("GTP module loaded (pdp ctx size %zd bytes)\n", |
459aa660 PN |
1369 | sizeof(struct pdp_ctx)); |
1370 | return 0; | |
1371 | ||
1372 | unreg_genl_family: | |
1373 | genl_unregister_family(>p_genl_family); | |
1374 | unreg_rtnl_link: | |
1375 | rtnl_link_unregister(>p_link_ops); | |
1376 | error_out: | |
1377 | pr_err("error loading GTP module loaded\n"); | |
1378 | return err; | |
1379 | } | |
1380 | late_initcall(gtp_init); | |
1381 | ||
1382 | static void __exit gtp_fini(void) | |
1383 | { | |
459aa660 PN |
1384 | genl_unregister_family(>p_genl_family); |
1385 | rtnl_link_unregister(>p_link_ops); | |
a2bed907 | 1386 | unregister_pernet_subsys(>p_net_ops); |
459aa660 PN |
1387 | |
1388 | pr_info("GTP module unloaded\n"); | |
1389 | } | |
1390 | module_exit(gtp_fini); | |
1391 | ||
1392 | MODULE_LICENSE("GPL"); | |
1393 | MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>"); | |
1394 | MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic"); | |
1395 | MODULE_ALIAS_RTNL_LINK("gtp"); | |
ab729823 | 1396 | MODULE_ALIAS_GENL_FAMILY("gtp"); |