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 { | |
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; | |
b20dc3c6 | 69 | u8 sk_created; |
459aa660 | 70 | |
459aa660 | 71 | struct net_device *dev; |
b20dc3c6 | 72 | struct net *net; |
459aa660 | 73 | |
91ed81f9 | 74 | unsigned int role; |
459aa660 PN |
75 | unsigned int hash_size; |
76 | struct hlist_head *tid_hash; | |
77 | struct hlist_head *addr_hash; | |
9af41cc3 WD |
78 | |
79 | u8 restart_count; | |
459aa660 PN |
80 | }; |
81 | ||
d33bd757 WD |
82 | struct echo_info { |
83 | struct in_addr ms_addr_ip4; | |
84 | struct in_addr peer_addr_ip4; | |
85 | u8 gtp_version; | |
86 | }; | |
87 | ||
c7d03a00 | 88 | static unsigned int gtp_net_id __read_mostly; |
459aa660 PN |
89 | |
90 | struct gtp_net { | |
91 | struct list_head gtp_dev_list; | |
92 | }; | |
93 | ||
94 | static u32 gtp_h_initval; | |
95 | ||
d33bd757 WD |
96 | static struct genl_family gtp_genl_family; |
97 | ||
98 | enum gtp_multicast_groups { | |
99 | GTP_GENL_MCGRP, | |
100 | }; | |
101 | ||
102 | static const struct genl_multicast_group gtp_genl_mcgrps[] = { | |
103 | [GTP_GENL_MCGRP] = { .name = GTP_GENL_MCGRP_NAME }, | |
104 | }; | |
105 | ||
6b5e2e74 AS |
106 | static void pdp_context_delete(struct pdp_ctx *pctx); |
107 | ||
459aa660 PN |
108 | static inline u32 gtp0_hashfn(u64 tid) |
109 | { | |
110 | u32 *tid32 = (u32 *) &tid; | |
111 | return jhash_2words(tid32[0], tid32[1], gtp_h_initval); | |
112 | } | |
113 | ||
114 | static inline u32 gtp1u_hashfn(u32 tid) | |
115 | { | |
116 | return jhash_1word(tid, gtp_h_initval); | |
117 | } | |
118 | ||
119 | static inline u32 ipv4_hashfn(__be32 ip) | |
120 | { | |
121 | return jhash_1word((__force u32)ip, gtp_h_initval); | |
122 | } | |
123 | ||
124 | /* Resolve a PDP context structure based on the 64bit TID. */ | |
125 | static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid) | |
126 | { | |
127 | struct hlist_head *head; | |
128 | struct pdp_ctx *pdp; | |
129 | ||
130 | head = >p->tid_hash[gtp0_hashfn(tid) % gtp->hash_size]; | |
131 | ||
132 | hlist_for_each_entry_rcu(pdp, head, hlist_tid) { | |
133 | if (pdp->gtp_version == GTP_V0 && | |
134 | pdp->u.v0.tid == tid) | |
135 | return pdp; | |
136 | } | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | /* Resolve a PDP context structure based on the 32bit TEI. */ | |
141 | static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid) | |
142 | { | |
143 | struct hlist_head *head; | |
144 | struct pdp_ctx *pdp; | |
145 | ||
146 | head = >p->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size]; | |
147 | ||
148 | hlist_for_each_entry_rcu(pdp, head, hlist_tid) { | |
149 | if (pdp->gtp_version == GTP_V1 && | |
150 | pdp->u.v1.i_tei == tid) | |
151 | return pdp; | |
152 | } | |
153 | return NULL; | |
154 | } | |
155 | ||
156 | /* Resolve a PDP context based on IPv4 address of MS. */ | |
157 | static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr) | |
158 | { | |
159 | struct hlist_head *head; | |
160 | struct pdp_ctx *pdp; | |
161 | ||
162 | head = >p->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size]; | |
163 | ||
164 | hlist_for_each_entry_rcu(pdp, head, hlist_addr) { | |
165 | if (pdp->af == AF_INET && | |
166 | pdp->ms_addr_ip4.s_addr == ms_addr) | |
167 | return pdp; | |
168 | } | |
169 | ||
170 | return NULL; | |
171 | } | |
172 | ||
91ed81f9 JB |
173 | static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx, |
174 | unsigned int hdrlen, unsigned int role) | |
459aa660 PN |
175 | { |
176 | struct iphdr *iph; | |
177 | ||
178 | if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr))) | |
179 | return false; | |
180 | ||
88edf103 | 181 | iph = (struct iphdr *)(skb->data + hdrlen); |
459aa660 | 182 | |
91ed81f9 JB |
183 | if (role == GTP_ROLE_SGSN) |
184 | return iph->daddr == pctx->ms_addr_ip4.s_addr; | |
185 | else | |
186 | return iph->saddr == pctx->ms_addr_ip4.s_addr; | |
459aa660 PN |
187 | } |
188 | ||
91ed81f9 | 189 | /* Check if the inner IP address in this packet is assigned to any |
459aa660 PN |
190 | * existing mobile subscriber. |
191 | */ | |
91ed81f9 JB |
192 | static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx, |
193 | unsigned int hdrlen, unsigned int role) | |
459aa660 PN |
194 | { |
195 | switch (ntohs(skb->protocol)) { | |
196 | case ETH_P_IP: | |
91ed81f9 | 197 | return gtp_check_ms_ipv4(skb, pctx, hdrlen, role); |
459aa660 PN |
198 | } |
199 | return false; | |
200 | } | |
201 | ||
49ecc587 JB |
202 | static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, |
203 | unsigned int hdrlen, unsigned int role) | |
5b171f9c | 204 | { |
49ecc587 JB |
205 | if (!gtp_check_ms(skb, pctx, hdrlen, role)) { |
206 | netdev_dbg(pctx->dev, "No PDP ctx for this MS\n"); | |
207 | return 1; | |
5b171f9c AS |
208 | } |
209 | ||
210 | /* Get rid of the GTP + UDP headers. */ | |
101cfbc1 | 211 | if (iptunnel_pull_header(skb, hdrlen, skb->protocol, |
9716178a JB |
212 | !net_eq(sock_net(pctx->sk), dev_net(pctx->dev)))) { |
213 | pctx->dev->stats.rx_length_errors++; | |
214 | goto err; | |
215 | } | |
9ab7e76a | 216 | |
49ecc587 | 217 | netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n"); |
5b171f9c AS |
218 | |
219 | /* Now that the UDP and the GTP header have been removed, set up the | |
220 | * new network header. This is required by the upper layer to | |
221 | * calculate the transport header. | |
222 | */ | |
223 | skb_reset_network_header(skb); | |
b2d898c8 | 224 | skb_reset_mac_header(skb); |
5b171f9c | 225 | |
49ecc587 JB |
226 | skb->dev = pctx->dev; |
227 | ||
228 | dev_sw_netstats_rx_add(pctx->dev, skb->len); | |
229 | ||
baebdf48 | 230 | __netif_rx(skb); |
5b171f9c | 231 | return 0; |
9716178a JB |
232 | |
233 | err: | |
234 | pctx->dev->stats.rx_dropped++; | |
235 | return -1; | |
5b171f9c AS |
236 | } |
237 | ||
9af41cc3 WD |
238 | static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4, |
239 | const struct sock *sk, | |
240 | __be32 daddr, __be32 saddr) | |
241 | { | |
242 | memset(fl4, 0, sizeof(*fl4)); | |
243 | fl4->flowi4_oif = sk->sk_bound_dev_if; | |
244 | fl4->daddr = daddr; | |
245 | fl4->saddr = saddr; | |
b16b5047 GN |
246 | fl4->flowi4_tos = ip_sock_rt_tos(sk); |
247 | fl4->flowi4_scope = ip_sock_rt_scope(sk); | |
9af41cc3 WD |
248 | fl4->flowi4_proto = sk->sk_protocol; |
249 | ||
250 | return ip_route_output_key(sock_net(sk), fl4); | |
251 | } | |
252 | ||
253 | /* GSM TS 09.60. 7.3 | |
254 | * In all Path Management messages: | |
255 | * - TID: is not used and shall be set to 0. | |
256 | * - Flow Label is not used and shall be set to 0 | |
257 | * In signalling messages: | |
258 | * - number: this field is not yet used in signalling messages. | |
259 | * It shall be set to 255 by the sender and shall be ignored | |
260 | * by the receiver | |
261 | * Returns true if the echo req was correct, false otherwise. | |
262 | */ | |
d33bd757 | 263 | static bool gtp0_validate_echo_hdr(struct gtp0_header *gtp0) |
9af41cc3 WD |
264 | { |
265 | return !(gtp0->tid || (gtp0->flags ^ 0x1e) || | |
266 | gtp0->number != 0xff || gtp0->flow); | |
267 | } | |
268 | ||
d33bd757 WD |
269 | /* msg_type has to be GTP_ECHO_REQ or GTP_ECHO_RSP */ |
270 | static void gtp0_build_echo_msg(struct gtp0_header *hdr, __u8 msg_type) | |
271 | { | |
272 | int len_pkt, len_hdr; | |
273 | ||
274 | hdr->flags = 0x1e; /* v0, GTP-non-prime. */ | |
275 | hdr->type = msg_type; | |
276 | /* GSM TS 09.60. 7.3 In all Path Management Flow Label and TID | |
277 | * are not used and shall be set to 0. | |
278 | */ | |
279 | hdr->flow = 0; | |
280 | hdr->tid = 0; | |
281 | hdr->number = 0xff; | |
282 | hdr->spare[0] = 0xff; | |
283 | hdr->spare[1] = 0xff; | |
284 | hdr->spare[2] = 0xff; | |
285 | ||
286 | len_pkt = sizeof(struct gtp0_packet); | |
287 | len_hdr = sizeof(struct gtp0_header); | |
288 | ||
289 | if (msg_type == GTP_ECHO_RSP) | |
290 | hdr->length = htons(len_pkt - len_hdr); | |
291 | else | |
292 | hdr->length = 0; | |
293 | } | |
294 | ||
9af41cc3 WD |
295 | static int gtp0_send_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) |
296 | { | |
297 | struct gtp0_packet *gtp_pkt; | |
298 | struct gtp0_header *gtp0; | |
299 | struct rtable *rt; | |
300 | struct flowi4 fl4; | |
301 | struct iphdr *iph; | |
302 | __be16 seq; | |
303 | ||
304 | gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); | |
305 | ||
d33bd757 | 306 | if (!gtp0_validate_echo_hdr(gtp0)) |
9af41cc3 WD |
307 | return -1; |
308 | ||
309 | seq = gtp0->seq; | |
310 | ||
311 | /* pull GTP and UDP headers */ | |
312 | skb_pull_data(skb, sizeof(struct gtp0_header) + sizeof(struct udphdr)); | |
313 | ||
314 | gtp_pkt = skb_push(skb, sizeof(struct gtp0_packet)); | |
315 | memset(gtp_pkt, 0, sizeof(struct gtp0_packet)); | |
316 | ||
d33bd757 | 317 | gtp0_build_echo_msg(>p_pkt->gtp0_h, GTP_ECHO_RSP); |
9af41cc3 WD |
318 | |
319 | /* GSM TS 09.60. 7.3 The Sequence Number in a signalling response | |
320 | * message shall be copied from the signalling request message | |
321 | * that the GSN is replying to. | |
322 | */ | |
323 | gtp_pkt->gtp0_h.seq = seq; | |
324 | ||
9af41cc3 WD |
325 | gtp_pkt->ie.tag = GTPIE_RECOVERY; |
326 | gtp_pkt->ie.val = gtp->restart_count; | |
327 | ||
328 | iph = ip_hdr(skb); | |
329 | ||
330 | /* find route to the sender, | |
331 | * src address becomes dst address and vice versa. | |
332 | */ | |
333 | rt = ip4_route_output_gtp(&fl4, gtp->sk0, iph->saddr, iph->daddr); | |
334 | if (IS_ERR(rt)) { | |
335 | netdev_dbg(gtp->dev, "no route for echo response from %pI4\n", | |
336 | &iph->saddr); | |
337 | return -1; | |
338 | } | |
339 | ||
340 | udp_tunnel_xmit_skb(rt, gtp->sk0, skb, | |
341 | fl4.saddr, fl4.daddr, | |
342 | iph->tos, | |
343 | ip4_dst_hoplimit(&rt->dst), | |
344 | 0, | |
345 | htons(GTP0_PORT), htons(GTP0_PORT), | |
346 | !net_eq(sock_net(gtp->sk1u), | |
347 | dev_net(gtp->dev)), | |
348 | false); | |
349 | return 0; | |
350 | } | |
351 | ||
d33bd757 WD |
352 | static int gtp_genl_fill_echo(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, |
353 | int flags, u32 type, struct echo_info echo) | |
354 | { | |
355 | void *genlh; | |
356 | ||
357 | genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, flags, | |
358 | type); | |
359 | if (!genlh) | |
360 | goto failure; | |
361 | ||
362 | if (nla_put_u32(skb, GTPA_VERSION, echo.gtp_version) || | |
363 | nla_put_be32(skb, GTPA_PEER_ADDRESS, echo.peer_addr_ip4.s_addr) || | |
364 | nla_put_be32(skb, GTPA_MS_ADDRESS, echo.ms_addr_ip4.s_addr)) | |
365 | goto failure; | |
366 | ||
367 | genlmsg_end(skb, genlh); | |
368 | return 0; | |
369 | ||
370 | failure: | |
371 | genlmsg_cancel(skb, genlh); | |
372 | return -EMSGSIZE; | |
373 | } | |
374 | ||
375 | static int gtp0_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) | |
376 | { | |
377 | struct gtp0_header *gtp0; | |
378 | struct echo_info echo; | |
379 | struct sk_buff *msg; | |
380 | struct iphdr *iph; | |
381 | int ret; | |
382 | ||
383 | gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); | |
384 | ||
385 | if (!gtp0_validate_echo_hdr(gtp0)) | |
386 | return -1; | |
387 | ||
388 | iph = ip_hdr(skb); | |
389 | echo.ms_addr_ip4.s_addr = iph->daddr; | |
390 | echo.peer_addr_ip4.s_addr = iph->saddr; | |
391 | echo.gtp_version = GTP_V0; | |
392 | ||
393 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
394 | if (!msg) | |
395 | return -ENOMEM; | |
396 | ||
397 | ret = gtp_genl_fill_echo(msg, 0, 0, 0, GTP_CMD_ECHOREQ, echo); | |
398 | if (ret < 0) { | |
399 | nlmsg_free(msg); | |
400 | return ret; | |
401 | } | |
402 | ||
403 | return genlmsg_multicast_netns(>p_genl_family, dev_net(gtp->dev), | |
404 | msg, 0, GTP_GENL_MCGRP, GFP_ATOMIC); | |
405 | } | |
406 | ||
459aa660 | 407 | /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */ |
101cfbc1 | 408 | static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) |
459aa660 PN |
409 | { |
410 | unsigned int hdrlen = sizeof(struct udphdr) + | |
411 | sizeof(struct gtp0_header); | |
412 | struct gtp0_header *gtp0; | |
49ecc587 | 413 | struct pdp_ctx *pctx; |
459aa660 PN |
414 | |
415 | if (!pskb_may_pull(skb, hdrlen)) | |
416 | return -1; | |
417 | ||
418 | gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); | |
419 | ||
420 | if ((gtp0->flags >> 5) != GTP_V0) | |
421 | return 1; | |
422 | ||
9af41cc3 WD |
423 | /* If the sockets were created in kernel, it means that |
424 | * there is no daemon running in userspace which would | |
425 | * handle echo request. | |
426 | */ | |
427 | if (gtp0->type == GTP_ECHO_REQ && gtp->sk_created) | |
428 | return gtp0_send_echo_resp(gtp, skb); | |
429 | ||
d33bd757 WD |
430 | if (gtp0->type == GTP_ECHO_RSP && gtp->sk_created) |
431 | return gtp0_handle_echo_resp(gtp, skb); | |
432 | ||
49ecc587 JB |
433 | if (gtp0->type != GTP_TPDU) |
434 | return 1; | |
435 | ||
436 | pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid)); | |
437 | if (!pctx) { | |
438 | netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); | |
439 | return 1; | |
440 | } | |
441 | ||
442 | return gtp_rx(pctx, skb, hdrlen, gtp->role); | |
459aa660 PN |
443 | } |
444 | ||
d33bd757 WD |
445 | /* msg_type has to be GTP_ECHO_REQ or GTP_ECHO_RSP */ |
446 | static void gtp1u_build_echo_msg(struct gtp1_header_long *hdr, __u8 msg_type) | |
447 | { | |
448 | int len_pkt, len_hdr; | |
449 | ||
450 | /* S flag must be set to 1 */ | |
451 | hdr->flags = 0x32; /* v1, GTP-non-prime. */ | |
452 | hdr->type = msg_type; | |
453 | /* 3GPP TS 29.281 5.1 - TEID has to be set to 0 */ | |
454 | hdr->tid = 0; | |
455 | ||
456 | /* seq, npdu and next should be counted to the length of the GTP packet | |
457 | * that's why szie of gtp1_header should be subtracted, | |
458 | * not size of gtp1_header_long. | |
459 | */ | |
460 | ||
461 | len_hdr = sizeof(struct gtp1_header); | |
462 | ||
463 | if (msg_type == GTP_ECHO_RSP) { | |
464 | len_pkt = sizeof(struct gtp1u_packet); | |
465 | hdr->length = htons(len_pkt - len_hdr); | |
466 | } else { | |
467 | /* GTP_ECHO_REQ does not carry GTP Information Element, | |
468 | * the why gtp1_header_long is used here. | |
469 | */ | |
470 | len_pkt = sizeof(struct gtp1_header_long); | |
471 | hdr->length = htons(len_pkt - len_hdr); | |
472 | } | |
473 | } | |
474 | ||
9af41cc3 WD |
475 | static int gtp1u_send_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) |
476 | { | |
477 | struct gtp1_header_long *gtp1u; | |
478 | struct gtp1u_packet *gtp_pkt; | |
479 | struct rtable *rt; | |
480 | struct flowi4 fl4; | |
481 | struct iphdr *iph; | |
482 | ||
483 | gtp1u = (struct gtp1_header_long *)(skb->data + sizeof(struct udphdr)); | |
484 | ||
485 | /* 3GPP TS 29.281 5.1 - For the Echo Request, Echo Response, | |
486 | * Error Indication and Supported Extension Headers Notification | |
487 | * messages, the S flag shall be set to 1 and TEID shall be set to 0. | |
488 | */ | |
489 | if (!(gtp1u->flags & GTP1_F_SEQ) || gtp1u->tid) | |
490 | return -1; | |
491 | ||
492 | /* pull GTP and UDP headers */ | |
493 | skb_pull_data(skb, | |
494 | sizeof(struct gtp1_header_long) + sizeof(struct udphdr)); | |
495 | ||
496 | gtp_pkt = skb_push(skb, sizeof(struct gtp1u_packet)); | |
497 | memset(gtp_pkt, 0, sizeof(struct gtp1u_packet)); | |
498 | ||
d33bd757 | 499 | gtp1u_build_echo_msg(>p_pkt->gtp1u_h, GTP_ECHO_RSP); |
9af41cc3 WD |
500 | |
501 | /* 3GPP TS 29.281 7.7.2 - The Restart Counter value in the | |
502 | * Recovery information element shall not be used, i.e. it shall | |
503 | * be set to zero by the sender and shall be ignored by the receiver. | |
504 | * The Recovery information element is mandatory due to backwards | |
505 | * compatibility reasons. | |
506 | */ | |
507 | gtp_pkt->ie.tag = GTPIE_RECOVERY; | |
508 | gtp_pkt->ie.val = 0; | |
509 | ||
510 | iph = ip_hdr(skb); | |
511 | ||
512 | /* find route to the sender, | |
513 | * src address becomes dst address and vice versa. | |
514 | */ | |
515 | rt = ip4_route_output_gtp(&fl4, gtp->sk1u, iph->saddr, iph->daddr); | |
516 | if (IS_ERR(rt)) { | |
517 | netdev_dbg(gtp->dev, "no route for echo response from %pI4\n", | |
518 | &iph->saddr); | |
519 | return -1; | |
520 | } | |
521 | ||
522 | udp_tunnel_xmit_skb(rt, gtp->sk1u, skb, | |
523 | fl4.saddr, fl4.daddr, | |
524 | iph->tos, | |
525 | ip4_dst_hoplimit(&rt->dst), | |
526 | 0, | |
527 | htons(GTP1U_PORT), htons(GTP1U_PORT), | |
528 | !net_eq(sock_net(gtp->sk1u), | |
529 | dev_net(gtp->dev)), | |
530 | false); | |
531 | return 0; | |
532 | } | |
533 | ||
d33bd757 WD |
534 | static int gtp1u_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) |
535 | { | |
536 | struct gtp1_header_long *gtp1u; | |
537 | struct echo_info echo; | |
538 | struct sk_buff *msg; | |
539 | struct iphdr *iph; | |
540 | int ret; | |
541 | ||
542 | gtp1u = (struct gtp1_header_long *)(skb->data + sizeof(struct udphdr)); | |
543 | ||
544 | /* 3GPP TS 29.281 5.1 - For the Echo Request, Echo Response, | |
545 | * Error Indication and Supported Extension Headers Notification | |
546 | * messages, the S flag shall be set to 1 and TEID shall be set to 0. | |
547 | */ | |
548 | if (!(gtp1u->flags & GTP1_F_SEQ) || gtp1u->tid) | |
549 | return -1; | |
550 | ||
551 | iph = ip_hdr(skb); | |
552 | echo.ms_addr_ip4.s_addr = iph->daddr; | |
553 | echo.peer_addr_ip4.s_addr = iph->saddr; | |
554 | echo.gtp_version = GTP_V1; | |
555 | ||
556 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
557 | if (!msg) | |
558 | return -ENOMEM; | |
559 | ||
560 | ret = gtp_genl_fill_echo(msg, 0, 0, 0, GTP_CMD_ECHOREQ, echo); | |
561 | if (ret < 0) { | |
562 | nlmsg_free(msg); | |
563 | return ret; | |
564 | } | |
565 | ||
566 | return genlmsg_multicast_netns(>p_genl_family, dev_net(gtp->dev), | |
567 | msg, 0, GTP_GENL_MCGRP, GFP_ATOMIC); | |
568 | } | |
569 | ||
101cfbc1 | 570 | static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) |
459aa660 PN |
571 | { |
572 | unsigned int hdrlen = sizeof(struct udphdr) + | |
573 | sizeof(struct gtp1_header); | |
574 | struct gtp1_header *gtp1; | |
49ecc587 | 575 | struct pdp_ctx *pctx; |
459aa660 PN |
576 | |
577 | if (!pskb_may_pull(skb, hdrlen)) | |
578 | return -1; | |
579 | ||
580 | gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); | |
581 | ||
582 | if ((gtp1->flags >> 5) != GTP_V1) | |
583 | return 1; | |
584 | ||
9af41cc3 WD |
585 | /* If the sockets were created in kernel, it means that |
586 | * there is no daemon running in userspace which would | |
587 | * handle echo request. | |
588 | */ | |
589 | if (gtp1->type == GTP_ECHO_REQ && gtp->sk_created) | |
590 | return gtp1u_send_echo_resp(gtp, skb); | |
591 | ||
d33bd757 WD |
592 | if (gtp1->type == GTP_ECHO_RSP && gtp->sk_created) |
593 | return gtp1u_handle_echo_resp(gtp, skb); | |
594 | ||
49ecc587 JB |
595 | if (gtp1->type != GTP_TPDU) |
596 | return 1; | |
597 | ||
459aa660 PN |
598 | /* From 29.060: "This field shall be present if and only if any one or |
599 | * more of the S, PN and E flags are set.". | |
600 | * | |
601 | * If any of the bit is set, then the remaining ones also have to be | |
602 | * set. | |
603 | */ | |
49ecc587 JB |
604 | if (gtp1->flags & GTP1_F_MASK) |
605 | hdrlen += 4; | |
606 | ||
459aa660 PN |
607 | /* Make sure the header is larger enough, including extensions. */ |
608 | if (!pskb_may_pull(skb, hdrlen)) | |
609 | return -1; | |
610 | ||
93edb8c7 PN |
611 | gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); |
612 | ||
49ecc587 JB |
613 | pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid)); |
614 | if (!pctx) { | |
615 | netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); | |
616 | return 1; | |
617 | } | |
618 | ||
619 | return gtp_rx(pctx, skb, hdrlen, gtp->role); | |
459aa660 PN |
620 | } |
621 | ||
1788b856 | 622 | static void __gtp_encap_destroy(struct sock *sk) |
459aa660 | 623 | { |
1e3a3abd | 624 | struct gtp_dev *gtp; |
459aa660 | 625 | |
e198987e TY |
626 | lock_sock(sk); |
627 | gtp = sk->sk_user_data; | |
1e3a3abd | 628 | if (gtp) { |
1788b856 TY |
629 | if (gtp->sk0 == sk) |
630 | gtp->sk0 = NULL; | |
631 | else | |
632 | gtp->sk1u = NULL; | |
70a36f57 | 633 | WRITE_ONCE(udp_sk(sk)->encap_type, 0); |
1e3a3abd | 634 | rcu_assign_sk_user_data(sk, NULL); |
ce3aee71 | 635 | release_sock(sk); |
1e3a3abd | 636 | sock_put(sk); |
ce3aee71 | 637 | return; |
1e3a3abd | 638 | } |
e198987e | 639 | release_sock(sk); |
459aa660 PN |
640 | } |
641 | ||
1788b856 TY |
642 | static void gtp_encap_destroy(struct sock *sk) |
643 | { | |
644 | rtnl_lock(); | |
645 | __gtp_encap_destroy(sk); | |
646 | rtnl_unlock(); | |
647 | } | |
648 | ||
1e3a3abd | 649 | static void gtp_encap_disable_sock(struct sock *sk) |
459aa660 | 650 | { |
1e3a3abd AS |
651 | if (!sk) |
652 | return; | |
459aa660 | 653 | |
1788b856 | 654 | __gtp_encap_destroy(sk); |
1e3a3abd AS |
655 | } |
656 | ||
657 | static void gtp_encap_disable(struct gtp_dev *gtp) | |
658 | { | |
b20dc3c6 WD |
659 | if (gtp->sk_created) { |
660 | udp_tunnel_sock_release(gtp->sk0->sk_socket); | |
661 | udp_tunnel_sock_release(gtp->sk1u->sk_socket); | |
662 | gtp->sk_created = false; | |
663 | gtp->sk0 = NULL; | |
664 | gtp->sk1u = NULL; | |
665 | } else { | |
666 | gtp_encap_disable_sock(gtp->sk0); | |
667 | gtp_encap_disable_sock(gtp->sk1u); | |
668 | } | |
459aa660 PN |
669 | } |
670 | ||
671 | /* UDP encapsulation receive handler. See net/ipv4/udp.c. | |
672 | * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket. | |
673 | */ | |
674 | static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
675 | { | |
459aa660 | 676 | struct gtp_dev *gtp; |
5b171f9c | 677 | int ret = 0; |
459aa660 PN |
678 | |
679 | gtp = rcu_dereference_sk_user_data(sk); | |
680 | if (!gtp) | |
681 | return 1; | |
682 | ||
49ecc587 | 683 | netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); |
459aa660 | 684 | |
70a36f57 | 685 | switch (READ_ONCE(udp_sk(sk)->encap_type)) { |
459aa660 PN |
686 | case UDP_ENCAP_GTP0: |
687 | netdev_dbg(gtp->dev, "received GTP0 packet\n"); | |
101cfbc1 | 688 | ret = gtp0_udp_encap_recv(gtp, skb); |
459aa660 PN |
689 | break; |
690 | case UDP_ENCAP_GTP1U: | |
691 | netdev_dbg(gtp->dev, "received GTP1U packet\n"); | |
101cfbc1 | 692 | ret = gtp1u_udp_encap_recv(gtp, skb); |
459aa660 PN |
693 | break; |
694 | default: | |
695 | ret = -1; /* Shouldn't happen. */ | |
696 | } | |
697 | ||
698 | switch (ret) { | |
699 | case 1: | |
700 | netdev_dbg(gtp->dev, "pass up to the process\n"); | |
5b171f9c | 701 | break; |
459aa660 | 702 | case 0: |
459aa660 PN |
703 | break; |
704 | case -1: | |
705 | netdev_dbg(gtp->dev, "GTP packet has been dropped\n"); | |
706 | kfree_skb(skb); | |
5b171f9c AS |
707 | ret = 0; |
708 | break; | |
459aa660 PN |
709 | } |
710 | ||
5b171f9c | 711 | return ret; |
459aa660 PN |
712 | } |
713 | ||
459aa660 PN |
714 | static void gtp_dev_uninit(struct net_device *dev) |
715 | { | |
716 | struct gtp_dev *gtp = netdev_priv(dev); | |
717 | ||
718 | gtp_encap_disable(gtp); | |
459aa660 PN |
719 | } |
720 | ||
459aa660 PN |
721 | static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) |
722 | { | |
723 | int payload_len = skb->len; | |
724 | struct gtp0_header *gtp0; | |
725 | ||
d58ff351 | 726 | gtp0 = skb_push(skb, sizeof(*gtp0)); |
459aa660 PN |
727 | |
728 | gtp0->flags = 0x1e; /* v0, GTP-non-prime. */ | |
729 | gtp0->type = GTP_TPDU; | |
730 | gtp0->length = htons(payload_len); | |
731 | gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff); | |
732 | gtp0->flow = htons(pctx->u.v0.flow); | |
733 | gtp0->number = 0xff; | |
734 | gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff; | |
735 | gtp0->tid = cpu_to_be64(pctx->u.v0.tid); | |
736 | } | |
737 | ||
49ecc587 | 738 | static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) |
459aa660 PN |
739 | { |
740 | int payload_len = skb->len; | |
741 | struct gtp1_header *gtp1; | |
742 | ||
d58ff351 | 743 | gtp1 = skb_push(skb, sizeof(*gtp1)); |
459aa660 PN |
744 | |
745 | /* Bits 8 7 6 5 4 3 2 1 | |
746 | * +--+--+--+--+--+--+--+--+ | |
d928be81 | 747 | * |version |PT| 0| E| S|PN| |
459aa660 PN |
748 | * +--+--+--+--+--+--+--+--+ |
749 | * 0 0 1 1 1 0 0 0 | |
750 | */ | |
d928be81 | 751 | gtp1->flags = 0x30; /* v1, GTP-non-prime. */ |
459aa660 PN |
752 | gtp1->type = GTP_TPDU; |
753 | gtp1->length = htons(payload_len); | |
49ecc587 | 754 | gtp1->tid = htonl(pctx->u.v1.o_tei); |
459aa660 | 755 | |
ec674565 | 756 | /* TODO: Support for extension header, sequence number and N-PDU. |
459aa660 PN |
757 | * Update the length field if any of them is available. |
758 | */ | |
759 | } | |
760 | ||
49ecc587 JB |
761 | struct gtp_pktinfo { |
762 | struct sock *sk; | |
763 | struct iphdr *iph; | |
764 | struct flowi4 fl4; | |
765 | struct rtable *rt; | |
766 | struct pdp_ctx *pctx; | |
767 | struct net_device *dev; | |
768 | __be16 gtph_port; | |
769 | }; | |
9ab7e76a | 770 | |
49ecc587 JB |
771 | static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo) |
772 | { | |
773 | switch (pktinfo->pctx->gtp_version) { | |
774 | case GTP_V0: | |
775 | pktinfo->gtph_port = htons(GTP0_PORT); | |
776 | gtp0_push_header(skb, pktinfo->pctx); | |
777 | break; | |
778 | case GTP_V1: | |
779 | pktinfo->gtph_port = htons(GTP1U_PORT); | |
780 | gtp1_push_header(skb, pktinfo->pctx); | |
781 | break; | |
459aa660 PN |
782 | } |
783 | } | |
784 | ||
785 | static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, | |
49ecc587 JB |
786 | struct sock *sk, struct iphdr *iph, |
787 | struct pdp_ctx *pctx, struct rtable *rt, | |
459aa660 PN |
788 | struct flowi4 *fl4, |
789 | struct net_device *dev) | |
790 | { | |
791 | pktinfo->sk = sk; | |
49ecc587 JB |
792 | pktinfo->iph = iph; |
793 | pktinfo->pctx = pctx; | |
459aa660 PN |
794 | pktinfo->rt = rt; |
795 | pktinfo->fl4 = *fl4; | |
796 | pktinfo->dev = dev; | |
797 | } | |
798 | ||
799 | static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, | |
800 | struct gtp_pktinfo *pktinfo) | |
801 | { | |
802 | struct gtp_dev *gtp = netdev_priv(dev); | |
803 | struct pdp_ctx *pctx; | |
804 | struct rtable *rt; | |
805 | struct flowi4 fl4; | |
49ecc587 JB |
806 | struct iphdr *iph; |
807 | __be16 df; | |
459aa660 PN |
808 | int mtu; |
809 | ||
49ecc587 JB |
810 | /* Read the IP destination address and resolve the PDP context. |
811 | * Prepend PDP header with TEI/TID from PDP ctx. | |
812 | */ | |
813 | iph = ip_hdr(skb); | |
814 | if (gtp->role == GTP_ROLE_SGSN) | |
815 | pctx = ipv4_pdp_find(gtp, iph->saddr); | |
816 | else | |
817 | pctx = ipv4_pdp_find(gtp, iph->daddr); | |
9ab7e76a | 818 | |
49ecc587 JB |
819 | if (!pctx) { |
820 | netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", | |
821 | &iph->daddr); | |
822 | return -ENOENT; | |
459aa660 | 823 | } |
49ecc587 | 824 | netdev_dbg(dev, "found PDP context %p\n", pctx); |
459aa660 | 825 | |
9af41cc3 WD |
826 | rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr, |
827 | inet_sk(pctx->sk)->inet_saddr); | |
459aa660 | 828 | if (IS_ERR(rt)) { |
49ecc587 JB |
829 | netdev_dbg(dev, "no route to SSGN %pI4\n", |
830 | &pctx->peer_addr_ip4.s_addr); | |
459aa660 PN |
831 | dev->stats.tx_carrier_errors++; |
832 | goto err; | |
833 | } | |
834 | ||
835 | if (rt->dst.dev == dev) { | |
49ecc587 JB |
836 | netdev_dbg(dev, "circular route to SSGN %pI4\n", |
837 | &pctx->peer_addr_ip4.s_addr); | |
459aa660 PN |
838 | dev->stats.collisions++; |
839 | goto err_rt; | |
840 | } | |
841 | ||
459aa660 | 842 | /* This is similar to tnl_update_pmtu(). */ |
49ecc587 | 843 | df = iph->frag_off; |
459aa660 PN |
844 | if (df) { |
845 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - | |
846 | sizeof(struct iphdr) - sizeof(struct udphdr); | |
49ecc587 | 847 | switch (pctx->gtp_version) { |
459aa660 PN |
848 | case GTP_V0: |
849 | mtu -= sizeof(struct gtp0_header); | |
850 | break; | |
851 | case GTP_V1: | |
852 | mtu -= sizeof(struct gtp1_header); | |
853 | break; | |
854 | } | |
855 | } else { | |
856 | mtu = dst_mtu(&rt->dst); | |
857 | } | |
858 | ||
5b71131b | 859 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
459aa660 | 860 | |
4530e5b8 PNA |
861 | if (iph->frag_off & htons(IP_DF) && |
862 | ((!skb_is_gso(skb) && skb->len > mtu) || | |
863 | (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu)))) { | |
49ecc587 | 864 | netdev_dbg(dev, "packet too big, fragmentation needed\n"); |
e0fce6f9 JD |
865 | icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
866 | htonl(mtu)); | |
459aa660 PN |
867 | goto err_rt; |
868 | } | |
869 | ||
49ecc587 JB |
870 | gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev); |
871 | gtp_push_header(skb, pktinfo); | |
459aa660 PN |
872 | |
873 | return 0; | |
874 | err_rt: | |
875 | ip_rt_put(rt); | |
876 | err: | |
877 | return -EBADMSG; | |
878 | } | |
879 | ||
880 | static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) | |
881 | { | |
49ecc587 | 882 | unsigned int proto = ntohs(skb->protocol); |
459aa660 PN |
883 | struct gtp_pktinfo pktinfo; |
884 | int err; | |
885 | ||
886 | /* Ensure there is sufficient headroom. */ | |
887 | if (skb_cow_head(skb, dev->needed_headroom)) | |
888 | goto tx_err; | |
889 | ||
890 | skb_reset_inner_headers(skb); | |
891 | ||
892 | /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */ | |
893 | rcu_read_lock(); | |
49ecc587 JB |
894 | switch (proto) { |
895 | case ETH_P_IP: | |
896 | err = gtp_build_skb_ip4(skb, dev, &pktinfo); | |
897 | break; | |
898 | default: | |
899 | err = -EOPNOTSUPP; | |
900 | break; | |
901 | } | |
459aa660 PN |
902 | rcu_read_unlock(); |
903 | ||
904 | if (err < 0) | |
905 | goto tx_err; | |
906 | ||
49ecc587 JB |
907 | switch (proto) { |
908 | case ETH_P_IP: | |
909 | netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n", | |
910 | &pktinfo.iph->saddr, &pktinfo.iph->daddr); | |
911 | udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, | |
912 | pktinfo.fl4.saddr, pktinfo.fl4.daddr, | |
913 | pktinfo.iph->tos, | |
914 | ip4_dst_hoplimit(&pktinfo.rt->dst), | |
915 | 0, | |
916 | pktinfo.gtph_port, pktinfo.gtph_port, | |
a9c0df76 JB |
917 | !net_eq(sock_net(pktinfo.pctx->sk), |
918 | dev_net(dev)), | |
919 | false); | |
49ecc587 JB |
920 | break; |
921 | } | |
459aa660 PN |
922 | |
923 | return NETDEV_TX_OK; | |
924 | tx_err: | |
925 | dev->stats.tx_errors++; | |
926 | dev_kfree_skb(skb); | |
927 | return NETDEV_TX_OK; | |
928 | } | |
929 | ||
930 | static const struct net_device_ops gtp_netdev_ops = { | |
459aa660 PN |
931 | .ndo_uninit = gtp_dev_uninit, |
932 | .ndo_start_xmit = gtp_dev_xmit, | |
459aa660 PN |
933 | }; |
934 | ||
29f53b5c JB |
935 | static const struct device_type gtp_type = { |
936 | .name = "gtp", | |
937 | }; | |
938 | ||
459aa660 PN |
939 | static void gtp_link_setup(struct net_device *dev) |
940 | { | |
e21eb3a0 JB |
941 | unsigned int max_gtp_header_len = sizeof(struct iphdr) + |
942 | sizeof(struct udphdr) + | |
943 | sizeof(struct gtp0_header); | |
81154bb8 | 944 | struct gtp_dev *gtp = netdev_priv(dev); |
e21eb3a0 | 945 | |
459aa660 | 946 | dev->netdev_ops = >p_netdev_ops; |
cf124db5 | 947 | dev->needs_free_netdev = true; |
29f53b5c | 948 | SET_NETDEV_DEVTYPE(dev, >p_type); |
459aa660 PN |
949 | |
950 | dev->hard_header_len = 0; | |
951 | dev->addr_len = 0; | |
e21eb3a0 | 952 | dev->mtu = ETH_DATA_LEN - max_gtp_header_len; |
459aa660 PN |
953 | |
954 | /* Zero header length. */ | |
955 | dev->type = ARPHRD_NONE; | |
956 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
957 | ||
660e5aae | 958 | dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; |
459aa660 PN |
959 | dev->priv_flags |= IFF_NO_QUEUE; |
960 | dev->features |= NETIF_F_LLTX; | |
961 | netif_keep_dst(dev); | |
962 | ||
e21eb3a0 | 963 | dev->needed_headroom = LL_MAX_HEADER + max_gtp_header_len; |
81154bb8 | 964 | gtp->dev = dev; |
459aa660 PN |
965 | } |
966 | ||
967 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); | |
49ecc587 | 968 | static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]); |
459aa660 | 969 | |
94dc550a TY |
970 | static void gtp_destructor(struct net_device *dev) |
971 | { | |
972 | struct gtp_dev *gtp = netdev_priv(dev); | |
973 | ||
974 | kfree(gtp->addr_hash); | |
975 | kfree(gtp->tid_hash); | |
976 | } | |
977 | ||
b20dc3c6 WD |
978 | static struct sock *gtp_create_sock(int type, struct gtp_dev *gtp) |
979 | { | |
980 | struct udp_tunnel_sock_cfg tuncfg = {}; | |
981 | struct udp_port_cfg udp_conf = { | |
982 | .local_ip.s_addr = htonl(INADDR_ANY), | |
983 | .family = AF_INET, | |
984 | }; | |
985 | struct net *net = gtp->net; | |
986 | struct socket *sock; | |
987 | int err; | |
988 | ||
989 | if (type == UDP_ENCAP_GTP0) | |
990 | udp_conf.local_udp_port = htons(GTP0_PORT); | |
991 | else if (type == UDP_ENCAP_GTP1U) | |
992 | udp_conf.local_udp_port = htons(GTP1U_PORT); | |
993 | else | |
994 | return ERR_PTR(-EINVAL); | |
995 | ||
996 | err = udp_sock_create(net, &udp_conf, &sock); | |
997 | if (err) | |
998 | return ERR_PTR(err); | |
999 | ||
1000 | tuncfg.sk_user_data = gtp; | |
1001 | tuncfg.encap_type = type; | |
1002 | tuncfg.encap_rcv = gtp_encap_recv; | |
1003 | tuncfg.encap_destroy = NULL; | |
1004 | ||
1005 | setup_udp_tunnel_sock(net, sock, &tuncfg); | |
1006 | ||
1007 | return sock->sk; | |
1008 | } | |
1009 | ||
1010 | static int gtp_create_sockets(struct gtp_dev *gtp, struct nlattr *data[]) | |
1011 | { | |
1012 | struct sock *sk1u = NULL; | |
1013 | struct sock *sk0 = NULL; | |
1014 | ||
1015 | sk0 = gtp_create_sock(UDP_ENCAP_GTP0, gtp); | |
1016 | if (IS_ERR(sk0)) | |
1017 | return PTR_ERR(sk0); | |
1018 | ||
1019 | sk1u = gtp_create_sock(UDP_ENCAP_GTP1U, gtp); | |
1020 | if (IS_ERR(sk1u)) { | |
1021 | udp_tunnel_sock_release(sk0->sk_socket); | |
1022 | return PTR_ERR(sk1u); | |
1023 | } | |
1024 | ||
1025 | gtp->sk_created = true; | |
1026 | gtp->sk0 = sk0; | |
1027 | gtp->sk1u = sk1u; | |
1028 | ||
1029 | return 0; | |
1030 | } | |
1031 | ||
459aa660 | 1032 | static int gtp_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1033 | struct nlattr *tb[], struct nlattr *data[], |
1034 | struct netlink_ext_ack *extack) | |
459aa660 | 1035 | { |
b20dc3c6 | 1036 | unsigned int role = GTP_ROLE_GGSN; |
459aa660 PN |
1037 | struct gtp_dev *gtp; |
1038 | struct gtp_net *gn; | |
1e3a3abd | 1039 | int hashsize, err; |
459aa660 | 1040 | |
459aa660 PN |
1041 | gtp = netdev_priv(dev); |
1042 | ||
6a902c0f | 1043 | if (!data[IFLA_GTP_PDP_HASHSIZE]) { |
459aa660 | 1044 | hashsize = 1024; |
6a902c0f | 1045 | } else { |
459aa660 | 1046 | hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]); |
6a902c0f TY |
1047 | if (!hashsize) |
1048 | hashsize = 1024; | |
1049 | } | |
459aa660 | 1050 | |
b20dc3c6 WD |
1051 | if (data[IFLA_GTP_ROLE]) { |
1052 | role = nla_get_u32(data[IFLA_GTP_ROLE]); | |
1053 | if (role > GTP_ROLE_SGSN) | |
1054 | return -EINVAL; | |
1055 | } | |
1056 | gtp->role = role; | |
1057 | ||
9af41cc3 WD |
1058 | if (!data[IFLA_GTP_RESTART_COUNT]) |
1059 | gtp->restart_count = 0; | |
1060 | else | |
1061 | gtp->restart_count = nla_get_u8(data[IFLA_GTP_RESTART_COUNT]); | |
1062 | ||
b20dc3c6 WD |
1063 | gtp->net = src_net; |
1064 | ||
459aa660 PN |
1065 | err = gtp_hashtable_new(gtp, hashsize); |
1066 | if (err < 0) | |
51467431 MF |
1067 | return err; |
1068 | ||
b20dc3c6 WD |
1069 | if (data[IFLA_GTP_CREATE_SOCKETS]) |
1070 | err = gtp_create_sockets(gtp, data); | |
1071 | else | |
1072 | err = gtp_encap_enable(gtp, data); | |
51467431 MF |
1073 | if (err < 0) |
1074 | goto out_hashtable; | |
459aa660 PN |
1075 | |
1076 | err = register_netdevice(dev); | |
1077 | if (err < 0) { | |
1078 | netdev_dbg(dev, "failed to register new netdev %d\n", err); | |
51467431 | 1079 | goto out_encap; |
459aa660 PN |
1080 | } |
1081 | ||
1082 | gn = net_generic(dev_net(dev), gtp_net_id); | |
1083 | list_add_rcu(>p->list, &gn->gtp_dev_list); | |
94dc550a | 1084 | dev->priv_destructor = gtp_destructor; |
459aa660 | 1085 | |
49ecc587 | 1086 | netdev_dbg(dev, "registered new GTP interface\n"); |
459aa660 PN |
1087 | |
1088 | return 0; | |
1089 | ||
51467431 MF |
1090 | out_encap: |
1091 | gtp_encap_disable(gtp); | |
459aa660 | 1092 | out_hashtable: |
94dc550a TY |
1093 | kfree(gtp->addr_hash); |
1094 | kfree(gtp->tid_hash); | |
459aa660 PN |
1095 | return err; |
1096 | } | |
1097 | ||
1098 | static void gtp_dellink(struct net_device *dev, struct list_head *head) | |
1099 | { | |
1100 | struct gtp_dev *gtp = netdev_priv(dev); | |
f2a90410 | 1101 | struct hlist_node *next; |
94dc550a TY |
1102 | struct pdp_ctx *pctx; |
1103 | int i; | |
1104 | ||
1105 | for (i = 0; i < gtp->hash_size; i++) | |
f2a90410 | 1106 | hlist_for_each_entry_safe(pctx, next, >p->tid_hash[i], hlist_tid) |
94dc550a | 1107 | pdp_context_delete(pctx); |
459aa660 | 1108 | |
459aa660 PN |
1109 | list_del_rcu(>p->list); |
1110 | unregister_netdevice_queue(dev, head); | |
1111 | } | |
1112 | ||
1113 | static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = { | |
1114 | [IFLA_GTP_FD0] = { .type = NLA_U32 }, | |
1115 | [IFLA_GTP_FD1] = { .type = NLA_U32 }, | |
1116 | [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 }, | |
91ed81f9 | 1117 | [IFLA_GTP_ROLE] = { .type = NLA_U32 }, |
b20dc3c6 | 1118 | [IFLA_GTP_CREATE_SOCKETS] = { .type = NLA_U8 }, |
9af41cc3 | 1119 | [IFLA_GTP_RESTART_COUNT] = { .type = NLA_U8 }, |
459aa660 PN |
1120 | }; |
1121 | ||
a8b8a889 MS |
1122 | static int gtp_validate(struct nlattr *tb[], struct nlattr *data[], |
1123 | struct netlink_ext_ack *extack) | |
459aa660 PN |
1124 | { |
1125 | if (!data) | |
1126 | return -EINVAL; | |
1127 | ||
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | static size_t gtp_get_size(const struct net_device *dev) | |
1132 | { | |
e1b2914e | 1133 | return nla_total_size(sizeof(__u32)) + /* IFLA_GTP_PDP_HASHSIZE */ |
9af41cc3 WD |
1134 | nla_total_size(sizeof(__u32)) + /* IFLA_GTP_ROLE */ |
1135 | nla_total_size(sizeof(__u8)); /* IFLA_GTP_RESTART_COUNT */ | |
459aa660 PN |
1136 | } |
1137 | ||
1138 | static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1139 | { | |
1140 | struct gtp_dev *gtp = netdev_priv(dev); | |
1141 | ||
1142 | if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size)) | |
1143 | goto nla_put_failure; | |
e1b2914e JB |
1144 | if (nla_put_u32(skb, IFLA_GTP_ROLE, gtp->role)) |
1145 | goto nla_put_failure; | |
9af41cc3 WD |
1146 | if (nla_put_u8(skb, IFLA_GTP_RESTART_COUNT, gtp->restart_count)) |
1147 | goto nla_put_failure; | |
459aa660 PN |
1148 | |
1149 | return 0; | |
1150 | ||
1151 | nla_put_failure: | |
1152 | return -EMSGSIZE; | |
1153 | } | |
1154 | ||
1155 | static struct rtnl_link_ops gtp_link_ops __read_mostly = { | |
1156 | .kind = "gtp", | |
1157 | .maxtype = IFLA_GTP_MAX, | |
1158 | .policy = gtp_policy, | |
1159 | .priv_size = sizeof(struct gtp_dev), | |
1160 | .setup = gtp_link_setup, | |
1161 | .validate = gtp_validate, | |
1162 | .newlink = gtp_newlink, | |
1163 | .dellink = gtp_dellink, | |
1164 | .get_size = gtp_get_size, | |
1165 | .fill_info = gtp_fill_info, | |
1166 | }; | |
1167 | ||
459aa660 PN |
1168 | static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) |
1169 | { | |
1170 | int i; | |
1171 | ||
6da2ec56 | 1172 | gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head), |
bd5cd35b | 1173 | GFP_KERNEL | __GFP_NOWARN); |
459aa660 PN |
1174 | if (gtp->addr_hash == NULL) |
1175 | return -ENOMEM; | |
1176 | ||
6da2ec56 | 1177 | gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head), |
bd5cd35b | 1178 | GFP_KERNEL | __GFP_NOWARN); |
459aa660 PN |
1179 | if (gtp->tid_hash == NULL) |
1180 | goto err1; | |
1181 | ||
1182 | gtp->hash_size = hsize; | |
1183 | ||
1184 | for (i = 0; i < hsize; i++) { | |
1185 | INIT_HLIST_HEAD(>p->addr_hash[i]); | |
1186 | INIT_HLIST_HEAD(>p->tid_hash[i]); | |
1187 | } | |
1188 | return 0; | |
1189 | err1: | |
1190 | kfree(gtp->addr_hash); | |
1191 | return -ENOMEM; | |
1192 | } | |
1193 | ||
49ecc587 JB |
1194 | static struct sock *gtp_encap_enable_socket(int fd, int type, |
1195 | struct gtp_dev *gtp) | |
459aa660 PN |
1196 | { |
1197 | struct udp_tunnel_sock_cfg tuncfg = {NULL}; | |
49ecc587 | 1198 | struct socket *sock; |
1e3a3abd | 1199 | struct sock *sk; |
49ecc587 JB |
1200 | int err; |
1201 | ||
1202 | pr_debug("enable gtp on %d, %d\n", fd, type); | |
1203 | ||
1204 | sock = sockfd_lookup(fd, &err); | |
1205 | if (!sock) { | |
1206 | pr_debug("gtp socket fd=%d not found\n", fd); | |
1207 | return NULL; | |
1208 | } | |
459aa660 | 1209 | |
940ba149 ED |
1210 | sk = sock->sk; |
1211 | if (sk->sk_protocol != IPPROTO_UDP || | |
1212 | sk->sk_type != SOCK_DGRAM || | |
1213 | (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) { | |
49ecc587 JB |
1214 | pr_debug("socket fd=%d not UDP\n", fd); |
1215 | sk = ERR_PTR(-EINVAL); | |
1216 | goto out_sock; | |
459aa660 PN |
1217 | } |
1218 | ||
940ba149 ED |
1219 | lock_sock(sk); |
1220 | if (sk->sk_user_data) { | |
49ecc587 JB |
1221 | sk = ERR_PTR(-EBUSY); |
1222 | goto out_rel_sock; | |
459aa660 PN |
1223 | } |
1224 | ||
1e3a3abd | 1225 | sock_hold(sk); |
459aa660 PN |
1226 | |
1227 | tuncfg.sk_user_data = gtp; | |
1e3a3abd | 1228 | tuncfg.encap_type = type; |
459aa660 PN |
1229 | tuncfg.encap_rcv = gtp_encap_recv; |
1230 | tuncfg.encap_destroy = gtp_encap_destroy; | |
1231 | ||
1e3a3abd | 1232 | setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg); |
9ab7e76a | 1233 | |
49ecc587 JB |
1234 | out_rel_sock: |
1235 | release_sock(sock->sk); | |
1236 | out_sock: | |
1e3a3abd | 1237 | sockfd_put(sock); |
49ecc587 | 1238 | return sk; |
1e3a3abd | 1239 | } |
459aa660 | 1240 | |
49ecc587 | 1241 | static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]) |
1e3a3abd AS |
1242 | { |
1243 | struct sock *sk1u = NULL; | |
1244 | struct sock *sk0 = NULL; | |
b20dc3c6 WD |
1245 | |
1246 | if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1]) | |
1247 | return -EINVAL; | |
1e3a3abd AS |
1248 | |
1249 | if (data[IFLA_GTP_FD0]) { | |
1250 | u32 fd0 = nla_get_u32(data[IFLA_GTP_FD0]); | |
1251 | ||
1252 | sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp); | |
1253 | if (IS_ERR(sk0)) | |
1254 | return PTR_ERR(sk0); | |
1255 | } | |
1256 | ||
1257 | if (data[IFLA_GTP_FD1]) { | |
1258 | u32 fd1 = nla_get_u32(data[IFLA_GTP_FD1]); | |
1259 | ||
1260 | sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp); | |
1261 | if (IS_ERR(sk1u)) { | |
b289ba5e | 1262 | gtp_encap_disable_sock(sk0); |
1e3a3abd AS |
1263 | return PTR_ERR(sk1u); |
1264 | } | |
1265 | } | |
1266 | ||
1267 | gtp->sk0 = sk0; | |
1268 | gtp->sk1u = sk1u; | |
1269 | ||
1270 | return 0; | |
459aa660 PN |
1271 | } |
1272 | ||
3fb94617 | 1273 | static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[]) |
459aa660 | 1274 | { |
3fb94617 AS |
1275 | struct gtp_dev *gtp = NULL; |
1276 | struct net_device *dev; | |
1277 | struct net *net; | |
459aa660 | 1278 | |
3fb94617 AS |
1279 | /* Examine the link attributes and figure out which network namespace |
1280 | * we are talking about. | |
1281 | */ | |
1282 | if (nla[GTPA_NET_NS_FD]) | |
1283 | net = get_net_ns_by_fd(nla_get_u32(nla[GTPA_NET_NS_FD])); | |
1284 | else | |
1285 | net = get_net(src_net); | |
1286 | ||
1287 | if (IS_ERR(net)) | |
1288 | return NULL; | |
1289 | ||
1290 | /* Check if there's an existing gtpX device to configure */ | |
1291 | dev = dev_get_by_index_rcu(net, nla_get_u32(nla[GTPA_LINK])); | |
65d786c2 | 1292 | if (dev && dev->netdev_ops == >p_netdev_ops) |
3fb94617 AS |
1293 | gtp = netdev_priv(dev); |
1294 | ||
1295 | put_net(net); | |
1296 | return gtp; | |
459aa660 PN |
1297 | } |
1298 | ||
1299 | static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) | |
1300 | { | |
1301 | pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); | |
1302 | pctx->af = AF_INET; | |
ae6336b5 JB |
1303 | pctx->peer_addr_ip4.s_addr = |
1304 | nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]); | |
459aa660 PN |
1305 | pctx->ms_addr_ip4.s_addr = |
1306 | nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
1307 | ||
1308 | switch (pctx->gtp_version) { | |
1309 | case GTP_V0: | |
1310 | /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow | |
1311 | * label needs to be the same for uplink and downlink packets, | |
1312 | * so let's annotate this. | |
1313 | */ | |
1314 | pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]); | |
1315 | pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]); | |
1316 | break; | |
1317 | case GTP_V1: | |
1318 | pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]); | |
1319 | pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]); | |
1320 | break; | |
1321 | default: | |
1322 | break; | |
1323 | } | |
1324 | } | |
1325 | ||
50aba46c ND |
1326 | static struct pdp_ctx *gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk, |
1327 | struct genl_info *info) | |
459aa660 | 1328 | { |
6b01b1d9 | 1329 | struct pdp_ctx *pctx, *pctx_tid = NULL; |
3fb94617 | 1330 | struct net_device *dev = gtp->dev; |
459aa660 | 1331 | u32 hash_ms, hash_tid = 0; |
6b01b1d9 | 1332 | unsigned int version; |
459aa660 PN |
1333 | bool found = false; |
1334 | __be32 ms_addr; | |
1335 | ||
1336 | ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
1337 | hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size; | |
6b01b1d9 | 1338 | version = nla_get_u32(info->attrs[GTPA_VERSION]); |
459aa660 | 1339 | |
6b01b1d9 TY |
1340 | pctx = ipv4_pdp_find(gtp, ms_addr); |
1341 | if (pctx) | |
1342 | found = true; | |
1343 | if (version == GTP_V0) | |
1344 | pctx_tid = gtp0_pdp_find(gtp, | |
1345 | nla_get_u64(info->attrs[GTPA_TID])); | |
1346 | else if (version == GTP_V1) | |
1347 | pctx_tid = gtp1_pdp_find(gtp, | |
1348 | nla_get_u32(info->attrs[GTPA_I_TEI])); | |
1349 | if (pctx_tid) | |
1350 | found = true; | |
459aa660 PN |
1351 | |
1352 | if (found) { | |
1353 | if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) | |
50aba46c | 1354 | return ERR_PTR(-EEXIST); |
459aa660 | 1355 | if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE) |
50aba46c | 1356 | return ERR_PTR(-EOPNOTSUPP); |
459aa660 | 1357 | |
6b01b1d9 | 1358 | if (pctx && pctx_tid) |
50aba46c | 1359 | return ERR_PTR(-EEXIST); |
6b01b1d9 TY |
1360 | if (!pctx) |
1361 | pctx = pctx_tid; | |
1362 | ||
459aa660 PN |
1363 | ipv4_pdp_fill(pctx, info); |
1364 | ||
1365 | if (pctx->gtp_version == GTP_V0) | |
1366 | netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n", | |
1367 | pctx->u.v0.tid, pctx); | |
1368 | else if (pctx->gtp_version == GTP_V1) | |
1369 | netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n", | |
1370 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); | |
1371 | ||
50aba46c | 1372 | return pctx; |
459aa660 PN |
1373 | |
1374 | } | |
1375 | ||
3f167e19 | 1376 | pctx = kmalloc(sizeof(*pctx), GFP_ATOMIC); |
459aa660 | 1377 | if (pctx == NULL) |
50aba46c | 1378 | return ERR_PTR(-ENOMEM); |
459aa660 | 1379 | |
101cfbc1 AS |
1380 | sock_hold(sk); |
1381 | pctx->sk = sk; | |
5b171f9c | 1382 | pctx->dev = gtp->dev; |
459aa660 PN |
1383 | ipv4_pdp_fill(pctx, info); |
1384 | atomic_set(&pctx->tx_seq, 0); | |
1385 | ||
1386 | switch (pctx->gtp_version) { | |
1387 | case GTP_V0: | |
1388 | /* TS 09.60: "The flow label identifies unambiguously a GTP | |
1389 | * flow.". We use the tid for this instead, I cannot find a | |
1390 | * situation in which this doesn't unambiguosly identify the | |
1391 | * PDP context. | |
1392 | */ | |
1393 | hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size; | |
1394 | break; | |
1395 | case GTP_V1: | |
1396 | hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size; | |
1397 | break; | |
1398 | } | |
1399 | ||
1400 | hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]); | |
1401 | hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]); | |
1402 | ||
1403 | switch (pctx->gtp_version) { | |
1404 | case GTP_V0: | |
1405 | netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n", | |
ae6336b5 | 1406 | pctx->u.v0.tid, &pctx->peer_addr_ip4, |
459aa660 PN |
1407 | &pctx->ms_addr_ip4, pctx); |
1408 | break; | |
1409 | case GTP_V1: | |
1410 | netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n", | |
1411 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, | |
ae6336b5 | 1412 | &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx); |
459aa660 PN |
1413 | break; |
1414 | } | |
1415 | ||
50aba46c | 1416 | return pctx; |
459aa660 PN |
1417 | } |
1418 | ||
101cfbc1 AS |
1419 | static void pdp_context_free(struct rcu_head *head) |
1420 | { | |
1421 | struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head); | |
1422 | ||
1423 | sock_put(pctx->sk); | |
1424 | kfree(pctx); | |
1425 | } | |
1426 | ||
6b5e2e74 AS |
1427 | static void pdp_context_delete(struct pdp_ctx *pctx) |
1428 | { | |
1429 | hlist_del_rcu(&pctx->hlist_tid); | |
1430 | hlist_del_rcu(&pctx->hlist_addr); | |
101cfbc1 | 1431 | call_rcu(&pctx->rcu_head, pdp_context_free); |
6b5e2e74 AS |
1432 | } |
1433 | ||
151ea46f | 1434 | static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation); |
50aba46c | 1435 | |
459aa660 PN |
1436 | static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) |
1437 | { | |
101cfbc1 | 1438 | unsigned int version; |
50aba46c | 1439 | struct pdp_ctx *pctx; |
3fb94617 | 1440 | struct gtp_dev *gtp; |
101cfbc1 | 1441 | struct sock *sk; |
3fb94617 | 1442 | int err; |
459aa660 PN |
1443 | |
1444 | if (!info->attrs[GTPA_VERSION] || | |
1445 | !info->attrs[GTPA_LINK] || | |
ae6336b5 | 1446 | !info->attrs[GTPA_PEER_ADDRESS] || |
459aa660 PN |
1447 | !info->attrs[GTPA_MS_ADDRESS]) |
1448 | return -EINVAL; | |
1449 | ||
101cfbc1 AS |
1450 | version = nla_get_u32(info->attrs[GTPA_VERSION]); |
1451 | ||
1452 | switch (version) { | |
459aa660 PN |
1453 | case GTP_V0: |
1454 | if (!info->attrs[GTPA_TID] || | |
1455 | !info->attrs[GTPA_FLOW]) | |
1456 | return -EINVAL; | |
1457 | break; | |
1458 | case GTP_V1: | |
1459 | if (!info->attrs[GTPA_I_TEI] || | |
1460 | !info->attrs[GTPA_O_TEI]) | |
1461 | return -EINVAL; | |
1462 | break; | |
1463 | ||
1464 | default: | |
1465 | return -EINVAL; | |
1466 | } | |
1467 | ||
1788b856 | 1468 | rtnl_lock(); |
459aa660 | 1469 | |
3fb94617 AS |
1470 | gtp = gtp_find_dev(sock_net(skb->sk), info->attrs); |
1471 | if (!gtp) { | |
1472 | err = -ENODEV; | |
1473 | goto out_unlock; | |
27ee441a | 1474 | } |
459aa660 | 1475 | |
101cfbc1 AS |
1476 | if (version == GTP_V0) |
1477 | sk = gtp->sk0; | |
1478 | else if (version == GTP_V1) | |
1479 | sk = gtp->sk1u; | |
1480 | else | |
1481 | sk = NULL; | |
1482 | ||
1483 | if (!sk) { | |
1484 | err = -ENODEV; | |
1485 | goto out_unlock; | |
1486 | } | |
1487 | ||
50aba46c ND |
1488 | pctx = gtp_pdp_add(gtp, sk, info); |
1489 | if (IS_ERR(pctx)) { | |
1490 | err = PTR_ERR(pctx); | |
1491 | } else { | |
151ea46f | 1492 | gtp_tunnel_notify(pctx, GTP_CMD_NEWPDP, GFP_KERNEL); |
50aba46c ND |
1493 | err = 0; |
1494 | } | |
3fb94617 AS |
1495 | |
1496 | out_unlock: | |
1788b856 | 1497 | rtnl_unlock(); |
3fb94617 | 1498 | return err; |
459aa660 PN |
1499 | } |
1500 | ||
d9e2dd12 AS |
1501 | static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net, |
1502 | struct nlattr *nla[]) | |
459aa660 | 1503 | { |
459aa660 | 1504 | struct gtp_dev *gtp; |
459aa660 | 1505 | |
d9e2dd12 AS |
1506 | gtp = gtp_find_dev(net, nla); |
1507 | if (!gtp) | |
1508 | return ERR_PTR(-ENODEV); | |
459aa660 | 1509 | |
d9e2dd12 AS |
1510 | if (nla[GTPA_MS_ADDRESS]) { |
1511 | __be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]); | |
459aa660 | 1512 | |
d9e2dd12 AS |
1513 | return ipv4_pdp_find(gtp, ip); |
1514 | } else if (nla[GTPA_VERSION]) { | |
1515 | u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]); | |
1516 | ||
1517 | if (gtp_version == GTP_V0 && nla[GTPA_TID]) | |
1518 | return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID])); | |
1519 | else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI]) | |
1520 | return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI])); | |
27ee441a | 1521 | } |
459aa660 | 1522 | |
d9e2dd12 AS |
1523 | return ERR_PTR(-EINVAL); |
1524 | } | |
459aa660 | 1525 | |
d9e2dd12 AS |
1526 | static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[]) |
1527 | { | |
1528 | struct pdp_ctx *pctx; | |
459aa660 | 1529 | |
d9e2dd12 AS |
1530 | if (nla[GTPA_LINK]) |
1531 | pctx = gtp_find_pdp_by_link(net, nla); | |
1532 | else | |
1533 | pctx = ERR_PTR(-EINVAL); | |
1534 | ||
1535 | if (!pctx) | |
1536 | pctx = ERR_PTR(-ENOENT); | |
1537 | ||
1538 | return pctx; | |
1539 | } | |
1540 | ||
1541 | static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) | |
1542 | { | |
1543 | struct pdp_ctx *pctx; | |
1544 | int err = 0; | |
1545 | ||
1546 | if (!info->attrs[GTPA_VERSION]) | |
1547 | return -EINVAL; | |
1548 | ||
1549 | rcu_read_lock(); | |
1550 | ||
1551 | pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); | |
1552 | if (IS_ERR(pctx)) { | |
1553 | err = PTR_ERR(pctx); | |
3fb94617 AS |
1554 | goto out_unlock; |
1555 | } | |
459aa660 PN |
1556 | |
1557 | if (pctx->gtp_version == GTP_V0) | |
d9e2dd12 | 1558 | netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n", |
459aa660 PN |
1559 | pctx->u.v0.tid, pctx); |
1560 | else if (pctx->gtp_version == GTP_V1) | |
d9e2dd12 | 1561 | netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n", |
459aa660 PN |
1562 | pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); |
1563 | ||
151ea46f | 1564 | gtp_tunnel_notify(pctx, GTP_CMD_DELPDP, GFP_ATOMIC); |
6b5e2e74 | 1565 | pdp_context_delete(pctx); |
459aa660 | 1566 | |
3fb94617 AS |
1567 | out_unlock: |
1568 | rcu_read_unlock(); | |
1569 | return err; | |
459aa660 PN |
1570 | } |
1571 | ||
459aa660 | 1572 | static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, |
846c68f7 | 1573 | int flags, u32 type, struct pdp_ctx *pctx) |
459aa660 PN |
1574 | { |
1575 | void *genlh; | |
1576 | ||
846c68f7 | 1577 | genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, flags, |
459aa660 PN |
1578 | type); |
1579 | if (genlh == NULL) | |
1580 | goto nlmsg_failure; | |
1581 | ||
1582 | if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) || | |
b274e47d | 1583 | nla_put_u32(skb, GTPA_LINK, pctx->dev->ifindex) || |
ae6336b5 | 1584 | nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) || |
459aa660 PN |
1585 | nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr)) |
1586 | goto nla_put_failure; | |
1587 | ||
1588 | switch (pctx->gtp_version) { | |
1589 | case GTP_V0: | |
1590 | if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) || | |
1591 | nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow)) | |
1592 | goto nla_put_failure; | |
1593 | break; | |
1594 | case GTP_V1: | |
1595 | if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) || | |
1596 | nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei)) | |
1597 | goto nla_put_failure; | |
1598 | break; | |
1599 | } | |
1600 | genlmsg_end(skb, genlh); | |
1601 | return 0; | |
1602 | ||
1603 | nlmsg_failure: | |
1604 | nla_put_failure: | |
1605 | genlmsg_cancel(skb, genlh); | |
1606 | return -EMSGSIZE; | |
1607 | } | |
1608 | ||
151ea46f | 1609 | static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation) |
50aba46c ND |
1610 | { |
1611 | struct sk_buff *msg; | |
1612 | int ret; | |
1613 | ||
151ea46f | 1614 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, allocation); |
50aba46c ND |
1615 | if (!msg) |
1616 | return -ENOMEM; | |
1617 | ||
1618 | ret = gtp_genl_fill_info(msg, 0, 0, 0, cmd, pctx); | |
1619 | if (ret < 0) { | |
1620 | nlmsg_free(msg); | |
1621 | return ret; | |
1622 | } | |
1623 | ||
1624 | ret = genlmsg_multicast_netns(>p_genl_family, dev_net(pctx->dev), msg, | |
1625 | 0, GTP_GENL_MCGRP, GFP_ATOMIC); | |
1626 | return ret; | |
1627 | } | |
1628 | ||
459aa660 PN |
1629 | static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) |
1630 | { | |
1631 | struct pdp_ctx *pctx = NULL; | |
459aa660 | 1632 | struct sk_buff *skb2; |
459aa660 PN |
1633 | int err; |
1634 | ||
d9e2dd12 | 1635 | if (!info->attrs[GTPA_VERSION]) |
459aa660 | 1636 | return -EINVAL; |
459aa660 | 1637 | |
3fb94617 | 1638 | rcu_read_lock(); |
459aa660 | 1639 | |
d9e2dd12 AS |
1640 | pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); |
1641 | if (IS_ERR(pctx)) { | |
1642 | err = PTR_ERR(pctx); | |
459aa660 PN |
1643 | goto err_unlock; |
1644 | } | |
1645 | ||
1646 | skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); | |
1647 | if (skb2 == NULL) { | |
1648 | err = -ENOMEM; | |
1649 | goto err_unlock; | |
1650 | } | |
1651 | ||
846c68f7 YK |
1652 | err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, info->snd_seq, |
1653 | 0, info->nlhdr->nlmsg_type, pctx); | |
459aa660 PN |
1654 | if (err < 0) |
1655 | goto err_unlock_free; | |
1656 | ||
1657 | rcu_read_unlock(); | |
1658 | return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid); | |
1659 | ||
1660 | err_unlock_free: | |
1661 | kfree_skb(skb2); | |
1662 | err_unlock: | |
1663 | rcu_read_unlock(); | |
1664 | return err; | |
1665 | } | |
1666 | ||
1667 | static int gtp_genl_dump_pdp(struct sk_buff *skb, | |
1668 | struct netlink_callback *cb) | |
1669 | { | |
1670 | struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp; | |
94a6d9fb | 1671 | int i, j, bucket = cb->args[0], skip = cb->args[1]; |
459aa660 | 1672 | struct net *net = sock_net(skb->sk); |
459aa660 | 1673 | struct pdp_ctx *pctx; |
94a6d9fb TY |
1674 | struct gtp_net *gn; |
1675 | ||
1676 | gn = net_generic(net, gtp_net_id); | |
459aa660 PN |
1677 | |
1678 | if (cb->args[4]) | |
1679 | return 0; | |
1680 | ||
94a6d9fb | 1681 | rcu_read_lock(); |
459aa660 PN |
1682 | list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { |
1683 | if (last_gtp && last_gtp != gtp) | |
1684 | continue; | |
1685 | else | |
1686 | last_gtp = NULL; | |
1687 | ||
94a6d9fb TY |
1688 | for (i = bucket; i < gtp->hash_size; i++) { |
1689 | j = 0; | |
1690 | hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], | |
1691 | hlist_tid) { | |
1692 | if (j >= skip && | |
1693 | gtp_genl_fill_info(skb, | |
1694 | NETLINK_CB(cb->skb).portid, | |
1695 | cb->nlh->nlmsg_seq, | |
846c68f7 | 1696 | NLM_F_MULTI, |
94a6d9fb | 1697 | cb->nlh->nlmsg_type, pctx)) { |
459aa660 | 1698 | cb->args[0] = i; |
94a6d9fb | 1699 | cb->args[1] = j; |
459aa660 PN |
1700 | cb->args[2] = (unsigned long)gtp; |
1701 | goto out; | |
1702 | } | |
94a6d9fb | 1703 | j++; |
459aa660 | 1704 | } |
94a6d9fb | 1705 | skip = 0; |
459aa660 | 1706 | } |
94a6d9fb | 1707 | bucket = 0; |
459aa660 PN |
1708 | } |
1709 | cb->args[4] = 1; | |
1710 | out: | |
94a6d9fb | 1711 | rcu_read_unlock(); |
459aa660 PN |
1712 | return skb->len; |
1713 | } | |
1714 | ||
d33bd757 WD |
1715 | static int gtp_genl_send_echo_req(struct sk_buff *skb, struct genl_info *info) |
1716 | { | |
1717 | struct sk_buff *skb_to_send; | |
1718 | __be32 src_ip, dst_ip; | |
1719 | unsigned int version; | |
1720 | struct gtp_dev *gtp; | |
1721 | struct flowi4 fl4; | |
1722 | struct rtable *rt; | |
1723 | struct sock *sk; | |
1724 | __be16 port; | |
1725 | int len; | |
1726 | ||
1727 | if (!info->attrs[GTPA_VERSION] || | |
1728 | !info->attrs[GTPA_LINK] || | |
1729 | !info->attrs[GTPA_PEER_ADDRESS] || | |
1730 | !info->attrs[GTPA_MS_ADDRESS]) | |
1731 | return -EINVAL; | |
1732 | ||
1733 | version = nla_get_u32(info->attrs[GTPA_VERSION]); | |
1734 | dst_ip = nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]); | |
1735 | src_ip = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); | |
1736 | ||
1737 | gtp = gtp_find_dev(sock_net(skb->sk), info->attrs); | |
1738 | if (!gtp) | |
1739 | return -ENODEV; | |
1740 | ||
1741 | if (!gtp->sk_created) | |
1742 | return -EOPNOTSUPP; | |
1743 | if (!(gtp->dev->flags & IFF_UP)) | |
1744 | return -ENETDOWN; | |
1745 | ||
1746 | if (version == GTP_V0) { | |
1747 | struct gtp0_header *gtp0_h; | |
1748 | ||
1749 | len = LL_RESERVED_SPACE(gtp->dev) + sizeof(struct gtp0_header) + | |
1750 | sizeof(struct iphdr) + sizeof(struct udphdr); | |
1751 | ||
1752 | skb_to_send = netdev_alloc_skb_ip_align(gtp->dev, len); | |
1753 | if (!skb_to_send) | |
1754 | return -ENOMEM; | |
1755 | ||
1756 | sk = gtp->sk0; | |
1757 | port = htons(GTP0_PORT); | |
1758 | ||
1759 | gtp0_h = skb_push(skb_to_send, sizeof(struct gtp0_header)); | |
1760 | memset(gtp0_h, 0, sizeof(struct gtp0_header)); | |
1761 | gtp0_build_echo_msg(gtp0_h, GTP_ECHO_REQ); | |
1762 | } else if (version == GTP_V1) { | |
1763 | struct gtp1_header_long *gtp1u_h; | |
1764 | ||
1765 | len = LL_RESERVED_SPACE(gtp->dev) + | |
1766 | sizeof(struct gtp1_header_long) + | |
1767 | sizeof(struct iphdr) + sizeof(struct udphdr); | |
1768 | ||
1769 | skb_to_send = netdev_alloc_skb_ip_align(gtp->dev, len); | |
1770 | if (!skb_to_send) | |
1771 | return -ENOMEM; | |
1772 | ||
1773 | sk = gtp->sk1u; | |
1774 | port = htons(GTP1U_PORT); | |
1775 | ||
1776 | gtp1u_h = skb_push(skb_to_send, | |
1777 | sizeof(struct gtp1_header_long)); | |
1778 | memset(gtp1u_h, 0, sizeof(struct gtp1_header_long)); | |
1779 | gtp1u_build_echo_msg(gtp1u_h, GTP_ECHO_REQ); | |
1780 | } else { | |
1781 | return -ENODEV; | |
1782 | } | |
1783 | ||
1784 | rt = ip4_route_output_gtp(&fl4, sk, dst_ip, src_ip); | |
1785 | if (IS_ERR(rt)) { | |
1786 | netdev_dbg(gtp->dev, "no route for echo request to %pI4\n", | |
1787 | &dst_ip); | |
02f39338 | 1788 | kfree_skb(skb_to_send); |
d33bd757 WD |
1789 | return -ENODEV; |
1790 | } | |
1791 | ||
1792 | udp_tunnel_xmit_skb(rt, sk, skb_to_send, | |
1793 | fl4.saddr, fl4.daddr, | |
1794 | fl4.flowi4_tos, | |
1795 | ip4_dst_hoplimit(&rt->dst), | |
1796 | 0, | |
1797 | port, port, | |
1798 | !net_eq(sock_net(sk), | |
1799 | dev_net(gtp->dev)), | |
1800 | false); | |
1801 | return 0; | |
1802 | } | |
1803 | ||
5761917a | 1804 | static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = { |
459aa660 PN |
1805 | [GTPA_LINK] = { .type = NLA_U32, }, |
1806 | [GTPA_VERSION] = { .type = NLA_U32, }, | |
1807 | [GTPA_TID] = { .type = NLA_U64, }, | |
ae6336b5 | 1808 | [GTPA_PEER_ADDRESS] = { .type = NLA_U32, }, |
459aa660 PN |
1809 | [GTPA_MS_ADDRESS] = { .type = NLA_U32, }, |
1810 | [GTPA_FLOW] = { .type = NLA_U16, }, | |
1811 | [GTPA_NET_NS_FD] = { .type = NLA_U32, }, | |
1812 | [GTPA_I_TEI] = { .type = NLA_U32, }, | |
1813 | [GTPA_O_TEI] = { .type = NLA_U32, }, | |
1814 | }; | |
1815 | ||
66a9b928 | 1816 | static const struct genl_small_ops gtp_genl_ops[] = { |
459aa660 PN |
1817 | { |
1818 | .cmd = GTP_CMD_NEWPDP, | |
ef6243ac | 1819 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 | 1820 | .doit = gtp_genl_new_pdp, |
459aa660 PN |
1821 | .flags = GENL_ADMIN_PERM, |
1822 | }, | |
1823 | { | |
1824 | .cmd = GTP_CMD_DELPDP, | |
ef6243ac | 1825 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 | 1826 | .doit = gtp_genl_del_pdp, |
459aa660 PN |
1827 | .flags = GENL_ADMIN_PERM, |
1828 | }, | |
1829 | { | |
1830 | .cmd = GTP_CMD_GETPDP, | |
ef6243ac | 1831 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
459aa660 PN |
1832 | .doit = gtp_genl_get_pdp, |
1833 | .dumpit = gtp_genl_dump_pdp, | |
459aa660 PN |
1834 | .flags = GENL_ADMIN_PERM, |
1835 | }, | |
d33bd757 WD |
1836 | { |
1837 | .cmd = GTP_CMD_ECHOREQ, | |
1838 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, | |
1839 | .doit = gtp_genl_send_echo_req, | |
1840 | .flags = GENL_ADMIN_PERM, | |
1841 | }, | |
459aa660 PN |
1842 | }; |
1843 | ||
56989f6d | 1844 | static struct genl_family gtp_genl_family __ro_after_init = { |
489111e5 JB |
1845 | .name = "gtp", |
1846 | .version = 0, | |
1847 | .hdrsize = 0, | |
1848 | .maxattr = GTPA_MAX, | |
3b0f31f2 | 1849 | .policy = gtp_genl_policy, |
489111e5 JB |
1850 | .netnsok = true, |
1851 | .module = THIS_MODULE, | |
66a9b928 JK |
1852 | .small_ops = gtp_genl_ops, |
1853 | .n_small_ops = ARRAY_SIZE(gtp_genl_ops), | |
9c5d03d3 | 1854 | .resv_start_op = GTP_CMD_ECHOREQ + 1, |
50aba46c ND |
1855 | .mcgrps = gtp_genl_mcgrps, |
1856 | .n_mcgrps = ARRAY_SIZE(gtp_genl_mcgrps), | |
489111e5 JB |
1857 | }; |
1858 | ||
459aa660 PN |
1859 | static int __net_init gtp_net_init(struct net *net) |
1860 | { | |
1861 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1862 | ||
1863 | INIT_LIST_HEAD(&gn->gtp_dev_list); | |
1864 | return 0; | |
1865 | } | |
1866 | ||
6eedda01 ED |
1867 | static void __net_exit gtp_net_exit_batch_rtnl(struct list_head *net_list, |
1868 | struct list_head *dev_to_kill) | |
459aa660 | 1869 | { |
6eedda01 | 1870 | struct net *net; |
459aa660 | 1871 | |
6eedda01 ED |
1872 | list_for_each_entry(net, net_list, exit_list) { |
1873 | struct gtp_net *gn = net_generic(net, gtp_net_id); | |
1874 | struct gtp_dev *gtp; | |
459aa660 | 1875 | |
6eedda01 ED |
1876 | list_for_each_entry(gtp, &gn->gtp_dev_list, list) |
1877 | gtp_dellink(gtp->dev, dev_to_kill); | |
1878 | } | |
459aa660 PN |
1879 | } |
1880 | ||
1881 | static struct pernet_operations gtp_net_ops = { | |
1882 | .init = gtp_net_init, | |
6eedda01 | 1883 | .exit_batch_rtnl = gtp_net_exit_batch_rtnl, |
459aa660 PN |
1884 | .id = >p_net_id, |
1885 | .size = sizeof(struct gtp_net), | |
1886 | }; | |
1887 | ||
1888 | static int __init gtp_init(void) | |
1889 | { | |
1890 | int err; | |
1891 | ||
1892 | get_random_bytes(>p_h_initval, sizeof(gtp_h_initval)); | |
1893 | ||
616d82c3 | 1894 | err = register_pernet_subsys(>p_net_ops); |
459aa660 PN |
1895 | if (err < 0) |
1896 | goto error_out; | |
1897 | ||
616d82c3 | 1898 | err = rtnl_link_register(>p_link_ops); |
459aa660 | 1899 | if (err < 0) |
616d82c3 | 1900 | goto unreg_pernet_subsys; |
459aa660 | 1901 | |
136cfaca | 1902 | err = genl_register_family(>p_genl_family); |
459aa660 | 1903 | if (err < 0) |
616d82c3 | 1904 | goto unreg_rtnl_link; |
459aa660 | 1905 | |
49ecc587 | 1906 | pr_info("GTP module loaded (pdp ctx size %zd bytes)\n", |
459aa660 PN |
1907 | sizeof(struct pdp_ctx)); |
1908 | return 0; | |
1909 | ||
459aa660 PN |
1910 | unreg_rtnl_link: |
1911 | rtnl_link_unregister(>p_link_ops); | |
616d82c3 AO |
1912 | unreg_pernet_subsys: |
1913 | unregister_pernet_subsys(>p_net_ops); | |
459aa660 PN |
1914 | error_out: |
1915 | pr_err("error loading GTP module loaded\n"); | |
1916 | return err; | |
1917 | } | |
1918 | late_initcall(gtp_init); | |
1919 | ||
1920 | static void __exit gtp_fini(void) | |
1921 | { | |
459aa660 PN |
1922 | genl_unregister_family(>p_genl_family); |
1923 | rtnl_link_unregister(>p_link_ops); | |
a2bed907 | 1924 | unregister_pernet_subsys(>p_net_ops); |
459aa660 PN |
1925 | |
1926 | pr_info("GTP module unloaded\n"); | |
1927 | } | |
1928 | module_exit(gtp_fini); | |
1929 | ||
1930 | MODULE_LICENSE("GPL"); | |
1931 | MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>"); | |
1932 | MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic"); | |
1933 | MODULE_ALIAS_RTNL_LINK("gtp"); | |
ab729823 | 1934 | MODULE_ALIAS_GENL_FAMILY("gtp"); |