]>
Commit | Line | Data |
---|---|---|
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 { | |
459aa660 PN |
41 | struct { |
42 | u64 tid; | |
43 | u16 flow; | |
44 | } v0; | |
45 | struct { | |
46 | u32 i_tei; | |
47 | u32 o_tei; | |
48 | } v1; | |
49 | } u; | |
50 | u8 gtp_version; | |
51 | u16 af; | |
52 | ||
53 | struct in_addr ms_addr_ip4; | |
ae6336b5 | 54 | struct in_addr peer_addr_ip4; |
459aa660 | 55 | |
101cfbc1 | 56 | struct sock *sk; |
5b171f9c AS |
57 | struct net_device *dev; |
58 | ||
459aa660 PN |
59 | atomic_t tx_seq; |
60 | struct rcu_head rcu_head; | |
61 | }; | |
62 | ||
63 | /* One instance of the GTP device. */ | |
64 | struct gtp_dev { | |
65 | struct list_head list; | |
66 | ||
17886c47 AS |
67 | struct sock *sk0; |
68 | struct sock *sk1u; | |
459aa660 | 69 | |
459aa660 PN |
70 | struct net_device *dev; |
71 | ||
91ed81f9 | 72 | unsigned int role; |
459aa660 PN |
73 | unsigned int hash_size; |
74 | struct hlist_head *tid_hash; | |
75 | struct hlist_head *addr_hash; | |
76 | }; | |
77 | ||
c7d03a00 | 78 | static unsigned int gtp_net_id __read_mostly; |
459aa660 PN |
79 | |
80 | struct gtp_net { | |
81 | struct list_head gtp_dev_list; | |
82 | }; | |
83 | ||
84 | static u32 gtp_h_initval; | |
85 | ||
6b5e2e74 AS |
86 | static void pdp_context_delete(struct pdp_ctx *pctx); |
87 | ||
459aa660 PN |
88 | static inline u32 gtp0_hashfn(u64 tid) |
89 | { | |
90 | u32 *tid32 = (u32 *) &tid; | |
91 | return jhash_2words(tid32[0], tid32[1], gtp_h_initval); | |
92 | } | |
93 | ||
94 | static inline u32 gtp1u_hashfn(u32 tid) | |
95 | { | |
96 | return jhash_1word(tid, gtp_h_initval); | |
97 | } | |
98 | ||
99 | static inline u32 ipv4_hashfn(__be32 ip) | |
100 | { | |
101 | return jhash_1word((__force u32)ip, gtp_h_initval); | |
102 | } | |
103 | ||
104 | /* Resolve a PDP context structure based on the 64bit TID. */ | |
105 | static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid) | |
106 | { | |
107 | struct hlist_head *head; | |
108 | struct pdp_ctx *pdp; | |
109 | ||
110 | head = >p->tid_hash[gtp0_hashfn(tid) % gtp->hash_size]; | |
111 | ||
112 | hlist_for_each_entry_rcu(pdp, head, hlist_tid) { | |
113 | if (pdp->gtp_version == GTP_V0 && | |
114 | pdp->u.v0.tid == tid) | |
115 | return pdp; | |
116 | } | |
117 | return NULL; | |
118 | } | |
119 | ||
120 | /* Resolve a PDP context structure based on the 32bit TEI. */ | |
121 | static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid) | |
122 | { | |
123 | struct hlist_head *head; | |
124 | struct pdp_ctx *pdp; | |
125 | ||
126 | head = >p->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size]; | |
127 | ||
128 | hlist_for_each_entry_rcu(pdp, head, hlist_tid) { | |
129 | if (pdp->gtp_version == GTP_V1 && | |
130 | pdp->u.v1.i_tei == tid) | |
131 | return pdp; | |
132 | } | |
133 | return NULL; | |
134 | } | |
135 | ||
136 | /* Resolve a PDP context based on IPv4 address of MS. */ | |
137 | static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr) | |
138 | { | |
139 | struct hlist_head *head; | |
140 | struct pdp_ctx *pdp; | |
141 | ||
142 | head = >p->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size]; | |
143 | ||
144 | hlist_for_each_entry_rcu(pdp, head, hlist_addr) { | |
145 | if (pdp->af == AF_INET && | |
146 | pdp->ms_addr_ip4.s_addr == ms_addr) | |
147 | return pdp; | |
148 | } | |
149 | ||
150 | return NULL; | |
151 | } | |
152 | ||
91ed81f9 JB |
153 | static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx, |
154 | unsigned int hdrlen, unsigned int role) | |
459aa660 PN |
155 | { |
156 | struct iphdr *iph; | |
157 | ||
158 | if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr))) | |
159 | return false; | |
160 | ||
88edf103 | 161 | iph = (struct iphdr *)(skb->data + hdrlen); |
459aa660 | 162 | |
91ed81f9 JB |
163 | if (role == GTP_ROLE_SGSN) |
164 | return iph->daddr == pctx->ms_addr_ip4.s_addr; | |
165 | else | |
166 | return iph->saddr == pctx->ms_addr_ip4.s_addr; | |
459aa660 PN |
167 | } |
168 | ||
91ed81f9 | 169 | /* Check if the inner IP address in this packet is assigned to any |
459aa660 PN |
170 | * existing mobile subscriber. |
171 | */ | |
91ed81f9 JB |
172 | static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx, |
173 | unsigned int hdrlen, unsigned int role) | |
459aa660 PN |
174 | { |
175 | switch (ntohs(skb->protocol)) { | |
176 | case ETH_P_IP: | |
91ed81f9 | 177 | return gtp_check_ms_ipv4(skb, pctx, hdrlen, role); |
459aa660 PN |
178 | } |
179 | return false; | |
180 | } | |
181 | ||
49ecc587 JB |
182 | static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, |
183 | unsigned int hdrlen, unsigned int role) | |
5b171f9c | 184 | { |
49ecc587 JB |
185 | if (!gtp_check_ms(skb, pctx, hdrlen, role)) { |
186 | netdev_dbg(pctx->dev, "No PDP ctx for this MS\n"); | |
187 | return 1; | |
5b171f9c AS |
188 | } |
189 | ||
190 | /* Get rid of the GTP + UDP headers. */ | |
101cfbc1 | 191 | if (iptunnel_pull_header(skb, hdrlen, skb->protocol, |
9716178a JB |
192 | !net_eq(sock_net(pctx->sk), dev_net(pctx->dev)))) { |
193 | pctx->dev->stats.rx_length_errors++; | |
194 | goto err; | |
195 | } | |
9ab7e76a | 196 | |
49ecc587 | 197 | netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n"); |
5b171f9c AS |
198 | |
199 | /* Now that the UDP and the GTP header have been removed, set up the | |
200 | * new network header. This is required by the upper layer to | |
201 | * calculate the transport header. | |
202 | */ | |
203 | skb_reset_network_header(skb); | |
b2d898c8 | 204 | skb_reset_mac_header(skb); |
5b171f9c | 205 | |
49ecc587 JB |
206 | skb->dev = pctx->dev; |
207 | ||
208 | dev_sw_netstats_rx_add(pctx->dev, skb->len); | |
209 | ||
5b171f9c AS |
210 | netif_rx(skb); |
211 | return 0; | |
9716178a JB |
212 | |
213 | err: | |
214 | pctx->dev->stats.rx_dropped++; | |
215 | return -1; | |
5b171f9c AS |
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; | |
49ecc587 | 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 | ||
49ecc587 JB |
234 | if (gtp0->type != GTP_TPDU) |
235 | return 1; | |
236 | ||
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); | |
240 | return 1; | |
241 | } | |
242 | ||
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; | |
49ecc587 | 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 | ||
49ecc587 JB |
261 | if (gtp1->type != GTP_TPDU) |
262 | return 1; | |
263 | ||
459aa660 PN |
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 | */ | |
49ecc587 JB |
270 | if (gtp1->flags & GTP1_F_MASK) |
271 | hdrlen += 4; | |
272 | ||
459aa660 PN |
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 | ||
49ecc587 JB |
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); | |
282 | return 1; | |
283 | } | |
284 | ||
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 | ||
49ecc587 | 339 | netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); |
459aa660 | 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, | |
49ecc587 | 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; | |
49ecc587 | 398 | fl4->saddr = inet_sk(sk)->inet_saddr; |
459aa660 PN |
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 | ||
49ecc587 | 422 | static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) |
459aa660 PN |
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); | |
49ecc587 | 438 | gtp1->tid = htonl(pctx->u.v1.o_tei); |
459aa660 | 439 | |
ec674565 | 440 | /* TODO: Support for extension header, sequence number and N-PDU. |
459aa660 PN |
441 | * Update the length field if any of them is available. |
442 | */ | |
443 | } | |
444 | ||
49ecc587 JB |
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 | }; | |
9ab7e76a | 454 | |
49ecc587 JB |
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; | |
459aa660 PN |
466 | } |
467 | } | |
468 | ||
469 | static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, | |
49ecc587 JB |
470 | struct sock *sk, struct iphdr *iph, |
471 | struct pdp_ctx *pctx, struct rtable *rt, | |
459aa660 PN |
472 | struct flowi4 *fl4, |
473 | struct net_device *dev) | |
474 | { | |
475 | pktinfo->sk = sk; | |
49ecc587 JB |
476 | pktinfo->iph = iph; |
477 | pktinfo->pctx = pctx; | |
459aa660 PN |
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; | |
49ecc587 JB |
490 | struct iphdr *iph; |
491 | __be16 df; | |
459aa660 PN |
492 | int mtu; |
493 | ||
49ecc587 JB |
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); | |
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); | |
9ab7e76a | 502 | |
49ecc587 JB |
503 | if (!pctx) { |
504 | netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", | |
505 | &iph->daddr); | |
506 | return -ENOENT; | |
459aa660 | 507 | } |
49ecc587 | 508 | netdev_dbg(dev, "found PDP context %p\n", pctx); |
459aa660 | 509 | |
49ecc587 | 510 | rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr); |
459aa660 | 511 | if (IS_ERR(rt)) { |
49ecc587 JB |
512 | netdev_dbg(dev, "no route to SSGN %pI4\n", |
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) { | |
49ecc587 JB |
519 | netdev_dbg(dev, "circular route to SSGN %pI4\n", |
520 | &pctx->peer_addr_ip4.s_addr); | |
459aa660 PN |
521 | dev->stats.collisions++; |
522 | goto err_rt; | |
523 | } | |
524 | ||
459aa660 | 525 | /* This is similar to tnl_update_pmtu(). */ |
49ecc587 | 526 | df = iph->frag_off; |
459aa660 PN |
527 | if (df) { |
528 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - | |
529 | sizeof(struct iphdr) - sizeof(struct udphdr); | |
49ecc587 | 530 | switch (pctx->gtp_version) { |
459aa660 PN |
531 | case GTP_V0: |
532 | mtu -= sizeof(struct gtp0_header); | |
533 | break; | |
534 | case GTP_V1: | |
535 | mtu -= sizeof(struct gtp1_header); | |
536 | break; | |
537 | } | |
538 | } else { | |
539 | mtu = dst_mtu(&rt->dst); | |
540 | } | |
541 | ||
6e9105c7 | 542 | rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu, false); |
459aa660 | 543 | |
49ecc587 JB |
544 | if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) && |
545 | mtu < ntohs(iph->tot_len)) { | |
546 | netdev_dbg(dev, "packet too big, fragmentation needed\n"); | |
e0fce6f9 JD |
547 | icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
548 | htonl(mtu)); | |
459aa660 PN |
549 | goto err_rt; |
550 | } | |
551 | ||
49ecc587 JB |
552 | gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev); |
553 | gtp_push_header(skb, pktinfo); | |
459aa660 PN |
554 | |
555 | return 0; | |
556 | err_rt: | |
557 | ip_rt_put(rt); | |
558 | err: | |
559 | return -EBADMSG; | |
560 | } | |
561 | ||
562 | static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) | |
563 | { | |
49ecc587 | 564 | unsigned int proto = ntohs(skb->protocol); |
459aa660 PN |
565 | struct gtp_pktinfo pktinfo; |
566 | int err; | |
567 | ||
568 | /* Ensure there is sufficient headroom. */ | |
569 | if (skb_cow_head(skb, dev->needed_headroom)) | |
570 | goto tx_err; | |
571 | ||
572 | skb_reset_inner_headers(skb); | |
573 | ||
574 | /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */ | |
575 | rcu_read_lock(); | |
49ecc587 JB |
576 | switch (proto) { |
577 | case ETH_P_IP: | |
578 | err = gtp_build_skb_ip4(skb, dev, &pktinfo); | |
579 | break; | |
580 | default: | |
581 | err = -EOPNOTSUPP; | |
582 | break; | |
583 | } | |
459aa660 PN |
584 | rcu_read_unlock(); |
585 | ||
586 | if (err < 0) | |
587 | goto tx_err; | |
588 | ||
49ecc587 JB |
589 | switch (proto) { |
590 | case ETH_P_IP: | |
591 | netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n", | |
592 | &pktinfo.iph->saddr, &pktinfo.iph->daddr); | |
593 | udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, | |
594 | pktinfo.fl4.saddr, pktinfo.fl4.daddr, | |
595 | pktinfo.iph->tos, | |
596 | ip4_dst_hoplimit(&pktinfo.rt->dst), | |
597 | 0, | |
598 | pktinfo.gtph_port, pktinfo.gtph_port, | |
a9c0df76 JB |
599 | !net_eq(sock_net(pktinfo.pctx->sk), |
600 | dev_net(dev)), | |
601 | false); | |
49ecc587 JB |
602 | break; |
603 | } | |
459aa660 PN |
604 | |
605 | return NETDEV_TX_OK; | |
606 | tx_err: | |
607 | dev->stats.tx_errors++; | |
608 | dev_kfree_skb(skb); | |
609 | return NETDEV_TX_OK; | |
610 | } | |
611 | ||
612 | static const struct net_device_ops gtp_netdev_ops = { | |
613 | .ndo_init = gtp_dev_init, | |
614 | .ndo_uninit = gtp_dev_uninit, | |
615 | .ndo_start_xmit = gtp_dev_xmit, | |
250f19c7 | 616 | .ndo_get_stats64 = dev_get_tstats64, |
459aa660 PN |
617 | }; |
618 | ||
29f53b5c JB |
619 | static const struct device_type gtp_type = { |
620 | .name = "gtp", | |
621 | }; | |
622 | ||
459aa660 PN |
623 | static void gtp_link_setup(struct net_device *dev) |
624 | { | |
e21eb3a0 JB |
625 | unsigned int max_gtp_header_len = sizeof(struct iphdr) + |
626 | sizeof(struct udphdr) + | |
627 | sizeof(struct gtp0_header); | |
628 | ||
459aa660 | 629 | dev->netdev_ops = >p_netdev_ops; |
cf124db5 | 630 | dev->needs_free_netdev = true; |
29f53b5c | 631 | SET_NETDEV_DEVTYPE(dev, >p_type); |
459aa660 PN |
632 | |
633 | dev->hard_header_len = 0; | |
634 | dev->addr_len = 0; | |
e21eb3a0 | 635 | dev->mtu = ETH_DATA_LEN - max_gtp_header_len; |
459aa660 PN |
636 | |
637 | /* Zero header length. */ | |
638 | dev->type = ARPHRD_NONE; | |
639 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
640 | ||
641 | dev->priv_flags |= IFF_NO_QUEUE; | |
642 | dev->features |= NETIF_F_LLTX; | |
643 | netif_keep_dst(dev); | |
644 | ||
e21eb3a0 | 645 | dev->needed_headroom = LL_MAX_HEADER + max_gtp_header_len; |
459aa660 PN |
646 | } |
647 | ||
648 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); | |
49ecc587 | 649 | static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]); |
459aa660 | 650 | |
94dc550a TY |
651 | static void gtp_destructor(struct net_device *dev) |
652 | { | |
653 | struct gtp_dev *gtp = netdev_priv(dev); | |
654 | ||
655 | kfree(gtp->addr_hash); | |
656 | kfree(gtp->tid_hash); | |
657 | } | |
658 | ||
459aa660 | 659 | static int gtp_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
660 | struct nlattr *tb[], struct nlattr *data[], |
661 | struct netlink_ext_ack *extack) | |
459aa660 | 662 | { |
459aa660 PN |
663 | struct gtp_dev *gtp; |
664 | struct gtp_net *gn; | |
1e3a3abd | 665 | int hashsize, err; |
459aa660 | 666 | |
49ecc587 | 667 | if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1]) |
459aa660 PN |
668 | return -EINVAL; |
669 | ||
670 | gtp = netdev_priv(dev); | |
671 | ||
6a902c0f | 672 | if (!data[IFLA_GTP_PDP_HASHSIZE]) { |
459aa660 | 673 | hashsize = 1024; |
6a902c0f | 674 | } else { |
459aa660 | 675 | hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]); |
6a902c0f TY |
676 | if (!hashsize) |
677 | hashsize = 1024; | |
678 | } | |
459aa660 PN |
679 | |
680 | err = gtp_hashtable_new(gtp, hashsize); | |
681 | if (err < 0) | |
51467431 MF |
682 | return err; |
683 | ||
49ecc587 | 684 | err = gtp_encap_enable(gtp, data); |
51467431 MF |
685 | if (err < 0) |
686 | goto out_hashtable; | |
459aa660 PN |
687 | |
688 | err = register_netdevice(dev); | |
689 | if (err < 0) { | |
690 | netdev_dbg(dev, "failed to register new netdev %d\n", err); | |
51467431 | 691 | goto out_encap; |
459aa660 PN |
692 | } |
693 | ||
694 | gn = net_generic(dev_net(dev), gtp_net_id); | |
695 | list_add_rcu(>p->list, &gn->gtp_dev_list); | |
94dc550a | 696 | dev->priv_destructor = gtp_destructor; |
459aa660 | 697 | |
49ecc587 | 698 | netdev_dbg(dev, "registered new GTP interface\n"); |
459aa660 PN |
699 | |
700 | return 0; | |
701 | ||
51467431 MF |
702 | out_encap: |
703 | gtp_encap_disable(gtp); | |
459aa660 | 704 | out_hashtable: |
94dc550a TY |
705 | kfree(gtp->addr_hash); |
706 | kfree(gtp->tid_hash); | |
459aa660 PN |
707 | return err; |
708 | } | |
709 | ||
710 | static void gtp_dellink(struct net_device *dev, struct list_head *head) | |
711 | { | |
712 | struct gtp_dev *gtp = netdev_priv(dev); | |
94dc550a TY |
713 | struct pdp_ctx *pctx; |
714 | int i; | |
715 | ||
716 | for (i = 0; i < gtp->hash_size; i++) | |
717 | hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) | |
718 | pdp_context_delete(pctx); | |
459aa660 | 719 | |
459aa660 PN |
720 | list_del_rcu(>p->list); |
721 | unregister_netdevice_queue(dev, head); | |
722 | } | |
723 | ||
724 | static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = { | |
725 | [IFLA_GTP_FD0] = { .type = NLA_U32 }, | |
726 | [IFLA_GTP_FD1] = { .type = NLA_U32 }, | |
727 | [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 }, | |
91ed81f9 | 728 | [IFLA_GTP_ROLE] = { .type = NLA_U32 }, |
459aa660 PN |
729 | }; |
730 | ||
a8b8a889 MS |
731 | static int gtp_validate(struct nlattr *tb[], struct nlattr *data[], |
732 | struct netlink_ext_ack *extack) | |
459aa660 PN |
733 | { |
734 | if (!data) | |
735 | return -EINVAL; | |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
740 | static size_t gtp_get_size(const struct net_device *dev) | |
741 | { | |
e1b2914e JB |
742 | return nla_total_size(sizeof(__u32)) + /* IFLA_GTP_PDP_HASHSIZE */ |
743 | nla_total_size(sizeof(__u32)); /* IFLA_GTP_ROLE */ | |
459aa660 PN |
744 | } |
745 | ||
746 | static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
747 | { | |
748 | struct gtp_dev *gtp = netdev_priv(dev); | |
749 | ||
750 | if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size)) | |
751 | goto nla_put_failure; | |
e1b2914e JB |
752 | if (nla_put_u32(skb, IFLA_GTP_ROLE, gtp->role)) |
753 | goto nla_put_failure; | |
459aa660 PN |
754 | |
755 | return 0; | |
756 | ||
757 | nla_put_failure: | |
758 | return -EMSGSIZE; | |
759 | } | |
760 | ||
761 | static struct rtnl_link_ops gtp_link_ops __read_mostly = { | |
762 | .kind = "gtp", | |
763 | .maxtype = IFLA_GTP_MAX, | |
764 | .policy = gtp_policy, | |
765 | .priv_size = sizeof(struct gtp_dev), | |
766 | .setup = gtp_link_setup, | |
767 | .validate = gtp_validate, | |
768 | .newlink = gtp_newlink, | |
769 | .dellink = gtp_dellink, | |
770 | .get_size = gtp_get_size, | |
771 | .fill_info = gtp_fill_info, | |
772 | }; | |
773 | ||
459aa660 PN |
774 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) |
775 | { | |
776 | int i; | |
777 | ||
6da2ec56 | 778 | gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head), |
bd5cd35b | 779 | GFP_KERNEL | __GFP_NOWARN); |
459aa660 PN |
780 | if (gtp->addr_hash == NULL) |
781 | return -ENOMEM; | |
782 | ||
6da2ec56 | 783 | gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head), |
bd5cd35b | 784 | GFP_KERNEL | __GFP_NOWARN); |
459aa660 PN |
785 | if (gtp->tid_hash == NULL) |
786 | goto err1; | |
787 | ||
788 | gtp->hash_size = hsize; | |
789 | ||
790 | for (i = 0; i < hsize; i++) { | |
791 | INIT_HLIST_HEAD(>p->addr_hash[i]); | |
792 | INIT_HLIST_HEAD(>p->tid_hash[i]); | |
793 | } | |
794 | return 0; | |
795 | err1: | |
796 | kfree(gtp->addr_hash); | |
797 | return -ENOMEM; | |
798 | } | |
799 | ||
49ecc587 JB |
800 | static struct sock *gtp_encap_enable_socket(int fd, int type, |
801 | struct gtp_dev *gtp) | |
459aa660 PN |
802 | { |
803 | struct udp_tunnel_sock_cfg tuncfg = {NULL}; | |
49ecc587 | 804 | struct socket *sock; |
1e3a3abd | 805 | struct sock *sk; |
49ecc587 JB |
806 | int err; |
807 | ||
808 | pr_debug("enable gtp on %d, %d\n", fd, type); | |
809 | ||
810 | sock = sockfd_lookup(fd, &err); | |
811 | if (!sock) { | |
812 | pr_debug("gtp socket fd=%d not found\n", fd); | |
813 | return NULL; | |
814 | } | |
459aa660 | 815 | |
940ba149 ED |
816 | sk = sock->sk; |
817 | if (sk->sk_protocol != IPPROTO_UDP || | |
818 | sk->sk_type != SOCK_DGRAM || | |
819 | (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) { | |
49ecc587 JB |
820 | pr_debug("socket fd=%d not UDP\n", fd); |
821 | sk = ERR_PTR(-EINVAL); | |
822 | goto out_sock; | |
459aa660 PN |
823 | } |
824 | ||
940ba149 ED |
825 | lock_sock(sk); |
826 | if (sk->sk_user_data) { | |
49ecc587 JB |
827 | sk = ERR_PTR(-EBUSY); |
828 | goto out_rel_sock; | |
459aa660 PN |
829 | } |
830 | ||
1e3a3abd | 831 | sock_hold(sk); |
459aa660 PN |
832 | |
833 | tuncfg.sk_user_data = gtp; | |
1e3a3abd | 834 | tuncfg.encap_type = type; |
459aa660 PN |
835 | tuncfg.encap_rcv = gtp_encap_recv; |
836 | tuncfg.encap_destroy = gtp_encap_destroy; | |
837 | ||
1e3a3abd | 838 | setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg); |
9ab7e76a | 839 | |
49ecc587 JB |
840 | out_rel_sock: |
841 | release_sock(sock->sk); | |
842 | out_sock: | |
1e3a3abd | 843 | sockfd_put(sock); |
49ecc587 | 844 | return sk; |
1e3a3abd | 845 | } |
459aa660 | 846 | |
49ecc587 | 847 | static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]) |
1e3a3abd AS |
848 | { |
849 | struct sock *sk1u = NULL; | |
850 | struct sock *sk0 = NULL; | |
91ed81f9 | 851 | unsigned int role = GTP_ROLE_GGSN; |
1e3a3abd AS |
852 | |
853 | if (data[IFLA_GTP_FD0]) { | |
854 | u32 fd0 = nla_get_u32(data[IFLA_GTP_FD0]); | |
855 | ||
856 | sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp); | |
857 | if (IS_ERR(sk0)) | |
858 | return PTR_ERR(sk0); | |
859 | } | |
860 | ||
861 | if (data[IFLA_GTP_FD1]) { | |
862 | u32 fd1 = nla_get_u32(data[IFLA_GTP_FD1]); | |
863 | ||
864 | sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp); | |
865 | if (IS_ERR(sk1u)) { | |
b289ba5e | 866 | gtp_encap_disable_sock(sk0); |
1e3a3abd AS |
867 | return PTR_ERR(sk1u); |
868 | } | |
869 | } | |
870 | ||
91ed81f9 JB |
871 | if (data[IFLA_GTP_ROLE]) { |
872 | role = nla_get_u32(data[IFLA_GTP_ROLE]); | |
e30155fd | 873 | if (role > GTP_ROLE_SGSN) { |
49ecc587 JB |
874 | gtp_encap_disable_sock(sk0); |
875 | gtp_encap_disable_sock(sk1u); | |
91ed81f9 | 876 | return -EINVAL; |
e30155fd | 877 | } |
91ed81f9 JB |
878 | } |
879 | ||
1e3a3abd AS |
880 | gtp->sk0 = sk0; |
881 | gtp->sk1u = sk1u; | |
91ed81f9 | 882 | gtp->role = role; |
1e3a3abd AS |
883 | |
884 | return 0; | |
459aa660 PN |
885 | } |
886 | ||
3fb94617 | 887 | static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[]) |
459aa660 | 888 | { |
3fb94617 AS |
889 | struct gtp_dev *gtp = NULL; |
890 | struct net_device *dev; | |
891 | struct net *net; | |
459aa660 | 892 | |
3fb94617 AS |
893 | /* Examine the link attributes and figure out which network namespace |
894 | * we are talking about. | |
895 | */ | |
896 | if (nla[GTPA_NET_NS_FD]) | |
897 | net = get_net_ns_by_fd(nla_get_u32(nla[GTPA_NET_NS_FD])); | |
898 | else | |
899 | net = get_net(src_net); | |
900 | ||
901 | if (IS_ERR(net)) | |
902 | return NULL; | |
903 | ||
904 | /* Check if there's an existing gtpX device to configure */ | |
905 | dev = dev_get_by_index_rcu(net, nla_get_u32(nla[GTPA_LINK])); | |
65d786c2 | 906 | if (dev && dev->netdev_ops == >p_netdev_ops) |
3fb94617 AS |
907 | gtp = netdev_priv(dev); |
908 | ||
909 | put_net(net); | |
910 | return gtp; | |
459aa660 PN |
911 | } |
912 | ||
913 | static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) | |
914 | { | |
915 | pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); | |
916 | pctx->af = AF_INET; | |
ae6336b5 JB |
917 | pctx->peer_addr_ip4.s_addr = |
918 | nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]); | |
459aa660 PN |
919 | pctx->ms_addr_ip4.s_addr = |
920 | nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
921 | ||
922 | switch (pctx->gtp_version) { | |
923 | case GTP_V0: | |
924 | /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow | |
925 | * label needs to be the same for uplink and downlink packets, | |
926 | * so let's annotate this. | |
927 | */ | |
928 | pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]); | |
929 | pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]); | |
930 | break; | |
931 | case GTP_V1: | |
932 | pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]); | |
933 | pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]); | |
934 | break; | |
935 | default: | |
936 | break; | |
937 | } | |
938 | } | |
939 | ||
50aba46c ND |
940 | static struct pdp_ctx *gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk, |
941 | struct genl_info *info) | |
459aa660 | 942 | { |
6b01b1d9 | 943 | struct pdp_ctx *pctx, *pctx_tid = NULL; |
3fb94617 | 944 | struct net_device *dev = gtp->dev; |
459aa660 | 945 | u32 hash_ms, hash_tid = 0; |
6b01b1d9 | 946 | unsigned int version; |
459aa660 PN |
947 | bool found = false; |
948 | __be32 ms_addr; | |
949 | ||
950 | ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
951 | hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size; | |
6b01b1d9 | 952 | version = nla_get_u32(info->attrs[GTPA_VERSION]); |
459aa660 | 953 | |
6b01b1d9 TY |
954 | pctx = ipv4_pdp_find(gtp, ms_addr); |
955 | if (pctx) | |
956 | found = true; | |
957 | if (version == GTP_V0) | |
958 | pctx_tid = gtp0_pdp_find(gtp, | |
959 | nla_get_u64(info->attrs[GTPA_TID])); | |
960 | else if (version == GTP_V1) | |
961 | pctx_tid = gtp1_pdp_find(gtp, | |
962 | nla_get_u32(info->attrs[GTPA_I_TEI])); | |
963 | if (pctx_tid) | |
964 | found = true; | |
459aa660 PN |
965 | |
966 | if (found) { | |
967 | if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) | |
50aba46c | 968 | return ERR_PTR(-EEXIST); |
459aa660 | 969 | if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE) |
50aba46c | 970 | return ERR_PTR(-EOPNOTSUPP); |
459aa660 | 971 | |
6b01b1d9 | 972 | if (pctx && pctx_tid) |
50aba46c | 973 | return ERR_PTR(-EEXIST); |
6b01b1d9 TY |
974 | if (!pctx) |
975 | pctx = pctx_tid; | |
976 | ||
459aa660 PN |
977 | ipv4_pdp_fill(pctx, info); |
978 | ||
979 | if (pctx->gtp_version == GTP_V0) | |
980 | netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n", | |
981 | pctx->u.v0.tid, pctx); | |
982 | else if (pctx->gtp_version == GTP_V1) | |
983 | netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n", | |
984 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); | |
985 | ||
50aba46c | 986 | return pctx; |
459aa660 PN |
987 | |
988 | } | |
989 | ||
3f167e19 | 990 | pctx = kmalloc(sizeof(*pctx), GFP_ATOMIC); |
459aa660 | 991 | if (pctx == NULL) |
50aba46c | 992 | return ERR_PTR(-ENOMEM); |
459aa660 | 993 | |
101cfbc1 AS |
994 | sock_hold(sk); |
995 | pctx->sk = sk; | |
5b171f9c | 996 | pctx->dev = gtp->dev; |
459aa660 PN |
997 | ipv4_pdp_fill(pctx, info); |
998 | atomic_set(&pctx->tx_seq, 0); | |
999 | ||
1000 | switch (pctx->gtp_version) { | |
1001 | case GTP_V0: | |
1002 | /* TS 09.60: "The flow label identifies unambiguously a GTP | |
1003 | * flow.". We use the tid for this instead, I cannot find a | |
1004 | * situation in which this doesn't unambiguosly identify the | |
1005 | * PDP context. | |
1006 | */ | |
1007 | hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size; | |
1008 | break; | |
1009 | case GTP_V1: | |
1010 | hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size; | |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]); | |
1015 | hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]); | |
1016 | ||
1017 | switch (pctx->gtp_version) { | |
1018 | case GTP_V0: | |
1019 | netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n", | |
ae6336b5 | 1020 | pctx->u.v0.tid, &pctx->peer_addr_ip4, |
459aa660 PN |
1021 | &pctx->ms_addr_ip4, pctx); |
1022 | break; | |
1023 | case GTP_V1: | |
1024 | netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n", | |
1025 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, | |
ae6336b5 | 1026 | &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx); |
459aa660 PN |
1027 | break; |
1028 | } | |
1029 | ||
50aba46c | 1030 | return pctx; |
459aa660 PN |
1031 | } |
1032 | ||
101cfbc1 AS |
1033 | static void pdp_context_free(struct rcu_head *head) |
1034 | { | |
1035 | struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head); | |
1036 | ||
1037 | sock_put(pctx->sk); | |
1038 | kfree(pctx); | |
1039 | } | |
1040 | ||
6b5e2e74 AS |
1041 | static void pdp_context_delete(struct pdp_ctx *pctx) |
1042 | { | |
1043 | hlist_del_rcu(&pctx->hlist_tid); | |
1044 | hlist_del_rcu(&pctx->hlist_addr); | |
101cfbc1 | 1045 | call_rcu(&pctx->rcu_head, pdp_context_free); |
6b5e2e74 AS |
1046 | } |
1047 | ||
151ea46f | 1048 | static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation); |
50aba46c | 1049 | |
459aa660 PN |
1050 | static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) |
1051 | { | |
101cfbc1 | 1052 | unsigned int version; |
50aba46c | 1053 | struct pdp_ctx *pctx; |
3fb94617 | 1054 | struct gtp_dev *gtp; |
101cfbc1 | 1055 | struct sock *sk; |
3fb94617 | 1056 | int err; |
459aa660 PN |
1057 | |
1058 | if (!info->attrs[GTPA_VERSION] || | |
1059 | !info->attrs[GTPA_LINK] || | |
ae6336b5 | 1060 | !info->attrs[GTPA_PEER_ADDRESS] || |
459aa660 PN |
1061 | !info->attrs[GTPA_MS_ADDRESS]) |
1062 | return -EINVAL; | |
1063 | ||
101cfbc1 AS |
1064 | version = nla_get_u32(info->attrs[GTPA_VERSION]); |
1065 | ||
1066 | switch (version) { | |
459aa660 PN |
1067 | case GTP_V0: |
1068 | if (!info->attrs[GTPA_TID] || | |
1069 | !info->attrs[GTPA_FLOW]) | |
1070 | return -EINVAL; | |
1071 | break; | |
1072 | case GTP_V1: | |
1073 | if (!info->attrs[GTPA_I_TEI] || | |
1074 | !info->attrs[GTPA_O_TEI]) | |
1075 | return -EINVAL; | |
1076 | break; | |
1077 | ||
1078 | default: | |
1079 | return -EINVAL; | |
1080 | } | |
1081 | ||
1788b856 | 1082 | rtnl_lock(); |
459aa660 | 1083 | |
3fb94617 AS |
1084 | gtp = gtp_find_dev(sock_net(skb->sk), info->attrs); |
1085 | if (!gtp) { | |
1086 | err = -ENODEV; | |
1087 | goto out_unlock; | |
27ee441a | 1088 | } |
459aa660 | 1089 | |
101cfbc1 AS |
1090 | if (version == GTP_V0) |
1091 | sk = gtp->sk0; | |
1092 | else if (version == GTP_V1) | |
1093 | sk = gtp->sk1u; | |
1094 | else | |
1095 | sk = NULL; | |
1096 | ||
1097 | if (!sk) { | |
1098 | err = -ENODEV; | |
1099 | goto out_unlock; | |
1100 | } | |
1101 | ||
50aba46c ND |
1102 | pctx = gtp_pdp_add(gtp, sk, info); |
1103 | if (IS_ERR(pctx)) { | |
1104 | err = PTR_ERR(pctx); | |
1105 | } else { | |
151ea46f | 1106 | gtp_tunnel_notify(pctx, GTP_CMD_NEWPDP, GFP_KERNEL); |
50aba46c ND |
1107 | err = 0; |
1108 | } | |
3fb94617 AS |
1109 | |
1110 | out_unlock: | |
1788b856 | 1111 | rtnl_unlock(); |
3fb94617 | 1112 | return err; |
459aa660 PN |
1113 | } |
1114 | ||
d9e2dd12 AS |
1115 | static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net, |
1116 | struct nlattr *nla[]) | |
459aa660 | 1117 | { |
459aa660 | 1118 | struct gtp_dev *gtp; |
459aa660 | 1119 | |
d9e2dd12 AS |
1120 | gtp = gtp_find_dev(net, nla); |
1121 | if (!gtp) | |
1122 | return ERR_PTR(-ENODEV); | |
459aa660 | 1123 | |
d9e2dd12 AS |
1124 | if (nla[GTPA_MS_ADDRESS]) { |
1125 | __be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]); | |
459aa660 | 1126 | |
d9e2dd12 AS |
1127 | return ipv4_pdp_find(gtp, ip); |
1128 | } else if (nla[GTPA_VERSION]) { | |
1129 | u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]); | |
1130 | ||
1131 | if (gtp_version == GTP_V0 && nla[GTPA_TID]) | |
1132 | return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID])); | |
1133 | else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI]) | |
1134 | return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI])); | |
27ee441a | 1135 | } |
459aa660 | 1136 | |
d9e2dd12 AS |
1137 | return ERR_PTR(-EINVAL); |
1138 | } | |
459aa660 | 1139 | |
d9e2dd12 AS |
1140 | static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[]) |
1141 | { | |
1142 | struct pdp_ctx *pctx; | |
459aa660 | 1143 | |
d9e2dd12 AS |
1144 | if (nla[GTPA_LINK]) |
1145 | pctx = gtp_find_pdp_by_link(net, nla); | |
1146 | else | |
1147 | pctx = ERR_PTR(-EINVAL); | |
1148 | ||
1149 | if (!pctx) | |
1150 | pctx = ERR_PTR(-ENOENT); | |
1151 | ||
1152 | return pctx; | |
1153 | } | |
1154 | ||
1155 | static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) | |
1156 | { | |
1157 | struct pdp_ctx *pctx; | |
1158 | int err = 0; | |
1159 | ||
1160 | if (!info->attrs[GTPA_VERSION]) | |
1161 | return -EINVAL; | |
1162 | ||
1163 | rcu_read_lock(); | |
1164 | ||
1165 | pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); | |
1166 | if (IS_ERR(pctx)) { | |
1167 | err = PTR_ERR(pctx); | |
3fb94617 AS |
1168 | goto out_unlock; |
1169 | } | |
459aa660 PN |
1170 | |
1171 | if (pctx->gtp_version == GTP_V0) | |
d9e2dd12 | 1172 | netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n", |
459aa660 PN |
1173 | pctx->u.v0.tid, pctx); |
1174 | else if (pctx->gtp_version == GTP_V1) | |
d9e2dd12 | 1175 | netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n", |
459aa660 PN |
1176 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); |
1177 | ||
151ea46f | 1178 | gtp_tunnel_notify(pctx, GTP_CMD_DELPDP, GFP_ATOMIC); |
6b5e2e74 | 1179 | pdp_context_delete(pctx); |
459aa660 | 1180 | |
3fb94617 AS |
1181 | out_unlock: |
1182 | rcu_read_unlock(); | |
1183 | return err; | |
459aa660 PN |
1184 | } |
1185 | ||
489111e5 | 1186 | static struct genl_family gtp_genl_family; |
459aa660 | 1187 | |
50aba46c ND |
1188 | enum gtp_multicast_groups { |
1189 | GTP_GENL_MCGRP, | |
1190 | }; | |
1191 | ||
1192 | static const struct genl_multicast_group gtp_genl_mcgrps[] = { | |
1193 | [GTP_GENL_MCGRP] = { .name = GTP_GENL_MCGRP_NAME }, | |
1194 | }; | |
1195 | ||
459aa660 | 1196 | static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, |
846c68f7 | 1197 | int flags, u32 type, struct pdp_ctx *pctx) |
459aa660 PN |
1198 | { |
1199 | void *genlh; | |
1200 | ||
846c68f7 | 1201 | genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, flags, |
459aa660 PN |
1202 | type); |
1203 | if (genlh == NULL) | |
1204 | goto nlmsg_failure; | |
1205 | ||
1206 | if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) || | |
b274e47d | 1207 | nla_put_u32(skb, GTPA_LINK, pctx->dev->ifindex) || |
ae6336b5 | 1208 | nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) || |
459aa660 PN |
1209 | nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr)) |
1210 | goto nla_put_failure; | |
1211 | ||
1212 | switch (pctx->gtp_version) { | |
1213 | case GTP_V0: | |
1214 | if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) || | |
1215 | nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow)) | |
1216 | goto nla_put_failure; | |
1217 | break; | |
1218 | case GTP_V1: | |
1219 | if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) || | |
1220 | nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei)) | |
1221 | goto nla_put_failure; | |
1222 | break; | |
1223 | } | |
1224 | genlmsg_end(skb, genlh); | |
1225 | return 0; | |
1226 | ||
1227 | nlmsg_failure: | |
1228 | nla_put_failure: | |
1229 | genlmsg_cancel(skb, genlh); | |
1230 | return -EMSGSIZE; | |
1231 | } | |
1232 | ||
151ea46f | 1233 | static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation) |
50aba46c ND |
1234 | { |
1235 | struct sk_buff *msg; | |
1236 | int ret; | |
1237 | ||
151ea46f | 1238 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, allocation); |
50aba46c ND |
1239 | if (!msg) |
1240 | return -ENOMEM; | |
1241 | ||
1242 | ret = gtp_genl_fill_info(msg, 0, 0, 0, cmd, pctx); | |
1243 | if (ret < 0) { | |
1244 | nlmsg_free(msg); | |
1245 | return ret; | |
1246 | } | |
1247 | ||
1248 | ret = genlmsg_multicast_netns(>p_genl_family, dev_net(pctx->dev), msg, | |
1249 | 0, GTP_GENL_MCGRP, GFP_ATOMIC); | |
1250 | return ret; | |
1251 | } | |
1252 | ||
459aa660 PN |
1253 | static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) |
1254 | { | |
1255 | struct pdp_ctx *pctx = NULL; | |
459aa660 | 1256 | struct sk_buff *skb2; |
459aa660 PN |
1257 | int err; |
1258 | ||
d9e2dd12 | 1259 | if (!info->attrs[GTPA_VERSION]) |
459aa660 | 1260 | return -EINVAL; |
459aa660 | 1261 | |
3fb94617 | 1262 | rcu_read_lock(); |
459aa660 | 1263 | |
d9e2dd12 AS |
1264 | pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); |
1265 | if (IS_ERR(pctx)) { | |
1266 | err = PTR_ERR(pctx); | |
459aa660 PN |
1267 | goto err_unlock; |
1268 | } | |
1269 | ||
1270 | skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); | |
1271 | if (skb2 == NULL) { | |
1272 | err = -ENOMEM; | |
1273 | goto err_unlock; | |
1274 | } | |
1275 | ||
846c68f7 YK |
1276 | err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, info->snd_seq, |
1277 | 0, info->nlhdr->nlmsg_type, pctx); | |
459aa660 PN |
1278 | if (err < 0) |
1279 | goto err_unlock_free; | |
1280 | ||
1281 | rcu_read_unlock(); | |
1282 | return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid); | |
1283 | ||
1284 | err_unlock_free: | |
1285 | kfree_skb(skb2); | |
1286 | err_unlock: | |
1287 | rcu_read_unlock(); | |
1288 | return err; | |
1289 | } | |
1290 | ||
1291 | static int gtp_genl_dump_pdp(struct sk_buff *skb, | |
1292 | struct netlink_callback *cb) | |
1293 | { | |
1294 | struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp; | |
94a6d9fb | 1295 | int i, j, bucket = cb->args[0], skip = cb->args[1]; |
459aa660 | 1296 | struct net *net = sock_net(skb->sk); |
459aa660 | 1297 | struct pdp_ctx *pctx; |
94a6d9fb TY |
1298 | struct gtp_net *gn; |
1299 | ||
1300 | gn = net_generic(net, gtp_net_id); | |
459aa660 PN |
1301 | |
1302 | if (cb->args[4]) | |
1303 | return 0; | |
1304 | ||
94a6d9fb | 1305 | rcu_read_lock(); |
459aa660 PN |
1306 | list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { |
1307 | if (last_gtp && last_gtp != gtp) | |
1308 | continue; | |
1309 | else | |
1310 | last_gtp = NULL; | |
1311 | ||
94a6d9fb TY |
1312 | for (i = bucket; i < gtp->hash_size; i++) { |
1313 | j = 0; | |
1314 | hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], | |
1315 | hlist_tid) { | |
1316 | if (j >= skip && | |
1317 | gtp_genl_fill_info(skb, | |
1318 | NETLINK_CB(cb->skb).portid, | |
1319 | cb->nlh->nlmsg_seq, | |
846c68f7 | 1320 | NLM_F_MULTI, |
94a6d9fb | 1321 | cb->nlh->nlmsg_type, pctx)) { |
459aa660 | 1322 | cb->args[0] = i; |
94a6d9fb | 1323 | cb->args[1] = j; |
459aa660 PN |
1324 | cb->args[2] = (unsigned long)gtp; |
1325 | goto out; | |
1326 | } | |
94a6d9fb | 1327 | j++; |
459aa660 | 1328 | } |
94a6d9fb | 1329 | skip = 0; |
459aa660 | 1330 | } |
94a6d9fb | 1331 | bucket = 0; |
459aa660 PN |
1332 | } |
1333 | cb->args[4] = 1; | |
1334 | out: | |
94a6d9fb | 1335 | rcu_read_unlock(); |
459aa660 PN |
1336 | return skb->len; |
1337 | } | |
1338 | ||
5761917a | 1339 | static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = { |
459aa660 PN |
1340 | [GTPA_LINK] = { .type = NLA_U32, }, |
1341 | [GTPA_VERSION] = { .type = NLA_U32, }, | |
1342 | [GTPA_TID] = { .type = NLA_U64, }, | |
ae6336b5 | 1343 | [GTPA_PEER_ADDRESS] = { .type = NLA_U32, }, |
459aa660 PN |
1344 | [GTPA_MS_ADDRESS] = { .type = NLA_U32, }, |
1345 | [GTPA_FLOW] = { .type = NLA_U16, }, | |
1346 | [GTPA_NET_NS_FD] = { .type = NLA_U32, }, | |
1347 | [GTPA_I_TEI] = { .type = NLA_U32, }, | |
1348 | [GTPA_O_TEI] = { .type = NLA_U32, }, | |
1349 | }; | |
1350 | ||
66a9b928 | 1351 | static const struct genl_small_ops gtp_genl_ops[] = { |
459aa660 PN |
1352 | { |
1353 | .cmd = GTP_CMD_NEWPDP, | |
ef6243ac | 1354 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 | 1355 | .doit = gtp_genl_new_pdp, |
459aa660 PN |
1356 | .flags = GENL_ADMIN_PERM, |
1357 | }, | |
1358 | { | |
1359 | .cmd = GTP_CMD_DELPDP, | |
ef6243ac | 1360 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 | 1361 | .doit = gtp_genl_del_pdp, |
459aa660 PN |
1362 | .flags = GENL_ADMIN_PERM, |
1363 | }, | |
1364 | { | |
1365 | .cmd = GTP_CMD_GETPDP, | |
ef6243ac | 1366 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 PN |
1367 | .doit = gtp_genl_get_pdp, |
1368 | .dumpit = gtp_genl_dump_pdp, | |
459aa660 PN |
1369 | .flags = GENL_ADMIN_PERM, |
1370 | }, | |
1371 | }; | |
1372 | ||
56989f6d | 1373 | static struct genl_family gtp_genl_family __ro_after_init = { |
489111e5 JB |
1374 | .name = "gtp", |
1375 | .version = 0, | |
1376 | .hdrsize = 0, | |
1377 | .maxattr = GTPA_MAX, | |
3b0f31f2 | 1378 | .policy = gtp_genl_policy, |
489111e5 JB |
1379 | .netnsok = true, |
1380 | .module = THIS_MODULE, | |
66a9b928 JK |
1381 | .small_ops = gtp_genl_ops, |
1382 | .n_small_ops = ARRAY_SIZE(gtp_genl_ops), | |
50aba46c ND |
1383 | .mcgrps = gtp_genl_mcgrps, |
1384 | .n_mcgrps = ARRAY_SIZE(gtp_genl_mcgrps), | |
489111e5 JB |
1385 | }; |
1386 | ||
459aa660 PN |
1387 | static int __net_init gtp_net_init(struct net *net) |
1388 | { | |
1389 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1390 | ||
1391 | INIT_LIST_HEAD(&gn->gtp_dev_list); | |
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | static void __net_exit gtp_net_exit(struct net *net) | |
1396 | { | |
1397 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1398 | struct gtp_dev *gtp; | |
1399 | LIST_HEAD(list); | |
1400 | ||
1401 | rtnl_lock(); | |
1402 | list_for_each_entry(gtp, &gn->gtp_dev_list, list) | |
1403 | gtp_dellink(gtp->dev, &list); | |
1404 | ||
1405 | unregister_netdevice_many(&list); | |
1406 | rtnl_unlock(); | |
1407 | } | |
1408 | ||
1409 | static struct pernet_operations gtp_net_ops = { | |
1410 | .init = gtp_net_init, | |
1411 | .exit = gtp_net_exit, | |
1412 | .id = >p_net_id, | |
1413 | .size = sizeof(struct gtp_net), | |
1414 | }; | |
1415 | ||
1416 | static int __init gtp_init(void) | |
1417 | { | |
1418 | int err; | |
1419 | ||
1420 | get_random_bytes(>p_h_initval, sizeof(gtp_h_initval)); | |
1421 | ||
1422 | err = rtnl_link_register(>p_link_ops); | |
1423 | if (err < 0) | |
1424 | goto error_out; | |
1425 | ||
489111e5 | 1426 | err = genl_register_family(>p_genl_family); |
459aa660 PN |
1427 | if (err < 0) |
1428 | goto unreg_rtnl_link; | |
1429 | ||
1430 | err = register_pernet_subsys(>p_net_ops); | |
1431 | if (err < 0) | |
1432 | goto unreg_genl_family; | |
1433 | ||
49ecc587 | 1434 | pr_info("GTP module loaded (pdp ctx size %zd bytes)\n", |
459aa660 PN |
1435 | sizeof(struct pdp_ctx)); |
1436 | return 0; | |
1437 | ||
1438 | unreg_genl_family: | |
1439 | genl_unregister_family(>p_genl_family); | |
1440 | unreg_rtnl_link: | |
1441 | rtnl_link_unregister(>p_link_ops); | |
1442 | error_out: | |
1443 | pr_err("error loading GTP module loaded\n"); | |
1444 | return err; | |
1445 | } | |
1446 | late_initcall(gtp_init); | |
1447 | ||
1448 | static void __exit gtp_fini(void) | |
1449 | { | |
459aa660 PN |
1450 | genl_unregister_family(>p_genl_family); |
1451 | rtnl_link_unregister(>p_link_ops); | |
a2bed907 | 1452 | unregister_pernet_subsys(>p_net_ops); |
459aa660 PN |
1453 | |
1454 | pr_info("GTP module unloaded\n"); | |
1455 | } | |
1456 | module_exit(gtp_fini); | |
1457 | ||
1458 | MODULE_LICENSE("GPL"); | |
1459 | MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>"); | |
1460 | MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic"); | |
1461 | MODULE_ALIAS_RTNL_LINK("gtp"); | |
ab729823 | 1462 | MODULE_ALIAS_GENL_FAMILY("gtp"); |