Commit | Line | Data |
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23461551 TH |
1 | #include <linux/module.h> |
2 | #include <linux/errno.h> | |
3 | #include <linux/socket.h> | |
4 | #include <linux/skbuff.h> | |
5 | #include <linux/ip.h> | |
6 | #include <linux/udp.h> | |
7 | #include <linux/types.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <net/genetlink.h> | |
37dd0247 | 10 | #include <net/gue.h> |
23461551 | 11 | #include <net/ip.h> |
afe93325 | 12 | #include <net/protocol.h> |
23461551 TH |
13 | #include <net/udp.h> |
14 | #include <net/udp_tunnel.h> | |
15 | #include <net/xfrm.h> | |
16 | #include <uapi/linux/fou.h> | |
17 | #include <uapi/linux/genetlink.h> | |
18 | ||
23461551 TH |
19 | struct fou { |
20 | struct socket *sock; | |
21 | u8 protocol; | |
fe881ef1 | 22 | u8 flags; |
4cbcdf2b | 23 | __be16 port; |
5f914b68 | 24 | u8 family; |
7a6c8c34 | 25 | u16 type; |
23461551 | 26 | struct list_head list; |
3036facb | 27 | struct rcu_head rcu; |
23461551 TH |
28 | }; |
29 | ||
fe881ef1 TH |
30 | #define FOU_F_REMCSUM_NOPARTIAL BIT(0) |
31 | ||
23461551 | 32 | struct fou_cfg { |
37dd0247 | 33 | u16 type; |
23461551 | 34 | u8 protocol; |
fe881ef1 | 35 | u8 flags; |
23461551 TH |
36 | struct udp_port_cfg udp_config; |
37 | }; | |
38 | ||
02d793c5 WC |
39 | static unsigned int fou_net_id; |
40 | ||
41 | struct fou_net { | |
42 | struct list_head fou_list; | |
43 | struct mutex fou_lock; | |
44 | }; | |
45 | ||
23461551 TH |
46 | static inline struct fou *fou_from_sock(struct sock *sk) |
47 | { | |
48 | return sk->sk_user_data; | |
49 | } | |
50 | ||
5f914b68 | 51 | static int fou_recv_pull(struct sk_buff *skb, struct fou *fou, size_t len) |
23461551 | 52 | { |
23461551 | 53 | /* Remove 'len' bytes from the packet (UDP header and |
5024c33a | 54 | * FOU header if present). |
23461551 | 55 | */ |
5f914b68 TH |
56 | if (fou->family == AF_INET) |
57 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len); | |
58 | else | |
59 | ipv6_hdr(skb)->payload_len = | |
60 | htons(ntohs(ipv6_hdr(skb)->payload_len) - len); | |
61 | ||
23461551 TH |
62 | __skb_pull(skb, len); |
63 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
64 | skb_reset_transport_header(skb); | |
a09a4c8d | 65 | return iptunnel_pull_offloads(skb); |
23461551 TH |
66 | } |
67 | ||
68 | static int fou_udp_recv(struct sock *sk, struct sk_buff *skb) | |
69 | { | |
70 | struct fou *fou = fou_from_sock(sk); | |
71 | ||
72 | if (!fou) | |
73 | return 1; | |
74 | ||
5f914b68 | 75 | if (fou_recv_pull(skb, fou, sizeof(struct udphdr))) |
a09a4c8d | 76 | goto drop; |
5024c33a TH |
77 | |
78 | return -fou->protocol; | |
a09a4c8d JG |
79 | |
80 | drop: | |
81 | kfree_skb(skb); | |
82 | return 0; | |
5024c33a TH |
83 | } |
84 | ||
a8d31c12 | 85 | static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr, |
fe881ef1 TH |
86 | void *data, size_t hdrlen, u8 ipproto, |
87 | bool nopartial) | |
a8d31c12 TH |
88 | { |
89 | __be16 *pd = data; | |
4fd671de TH |
90 | size_t start = ntohs(pd[0]); |
91 | size_t offset = ntohs(pd[1]); | |
b7fe10e5 TH |
92 | size_t plen = sizeof(struct udphdr) + hdrlen + |
93 | max_t(size_t, offset + sizeof(u16), start); | |
94 | ||
95 | if (skb->remcsum_offload) | |
96 | return guehdr; | |
a8d31c12 | 97 | |
a8d31c12 TH |
98 | if (!pskb_may_pull(skb, plen)) |
99 | return NULL; | |
100 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
101 | ||
fe881ef1 TH |
102 | skb_remcsum_process(skb, (void *)guehdr + hdrlen, |
103 | start, offset, nopartial); | |
a8d31c12 TH |
104 | |
105 | return guehdr; | |
106 | } | |
107 | ||
5024c33a TH |
108 | static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr) |
109 | { | |
110 | /* No support yet */ | |
111 | kfree_skb(skb); | |
112 | return 0; | |
23461551 TH |
113 | } |
114 | ||
37dd0247 TH |
115 | static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) |
116 | { | |
117 | struct fou *fou = fou_from_sock(sk); | |
5024c33a | 118 | size_t len, optlen, hdrlen; |
37dd0247 | 119 | struct guehdr *guehdr; |
5024c33a | 120 | void *data; |
a8d31c12 | 121 | u16 doffset = 0; |
37dd0247 TH |
122 | |
123 | if (!fou) | |
124 | return 1; | |
125 | ||
126 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
127 | if (!pskb_may_pull(skb, len)) | |
128 | goto drop; | |
129 | ||
5024c33a TH |
130 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; |
131 | ||
c1e48af7 TH |
132 | switch (guehdr->version) { |
133 | case 0: /* Full GUE header present */ | |
134 | break; | |
135 | ||
136 | case 1: { | |
137 | /* Direct encasulation of IPv4 or IPv6 */ | |
138 | ||
139 | int prot; | |
140 | ||
141 | switch (((struct iphdr *)guehdr)->version) { | |
142 | case 4: | |
143 | prot = IPPROTO_IPIP; | |
144 | break; | |
145 | case 6: | |
146 | prot = IPPROTO_IPV6; | |
147 | break; | |
148 | default: | |
149 | goto drop; | |
150 | } | |
151 | ||
152 | if (fou_recv_pull(skb, fou, sizeof(struct udphdr))) | |
153 | goto drop; | |
154 | ||
155 | return -prot; | |
156 | } | |
157 | ||
158 | default: /* Undefined version */ | |
159 | goto drop; | |
160 | } | |
161 | ||
5024c33a TH |
162 | optlen = guehdr->hlen << 2; |
163 | len += optlen; | |
37dd0247 | 164 | |
37dd0247 TH |
165 | if (!pskb_may_pull(skb, len)) |
166 | goto drop; | |
167 | ||
5024c33a TH |
168 | /* guehdr may change after pull */ |
169 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
d8f00d27 | 170 | |
5024c33a | 171 | hdrlen = sizeof(struct guehdr) + optlen; |
37dd0247 | 172 | |
5024c33a | 173 | if (guehdr->version != 0 || validate_gue_flags(guehdr, optlen)) |
37dd0247 | 174 | goto drop; |
5024c33a | 175 | |
a8d31c12 TH |
176 | hdrlen = sizeof(struct guehdr) + optlen; |
177 | ||
5f914b68 TH |
178 | if (fou->family == AF_INET) |
179 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len); | |
180 | else | |
181 | ipv6_hdr(skb)->payload_len = | |
182 | htons(ntohs(ipv6_hdr(skb)->payload_len) - len); | |
a8d31c12 | 183 | |
a8d31c12 TH |
184 | /* Pull csum through the guehdr now . This can be used if |
185 | * there is a remote checksum offload. | |
186 | */ | |
187 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
5024c33a TH |
188 | |
189 | data = &guehdr[1]; | |
190 | ||
191 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 TH |
192 | __be32 flags = *(__be32 *)(data + doffset); |
193 | ||
194 | doffset += GUE_LEN_PRIV; | |
195 | ||
196 | if (flags & GUE_PFLAG_REMCSUM) { | |
197 | guehdr = gue_remcsum(skb, guehdr, data + doffset, | |
fe881ef1 TH |
198 | hdrlen, guehdr->proto_ctype, |
199 | !!(fou->flags & | |
200 | FOU_F_REMCSUM_NOPARTIAL)); | |
a8d31c12 TH |
201 | if (!guehdr) |
202 | goto drop; | |
203 | ||
204 | data = &guehdr[1]; | |
5024c33a | 205 | |
a8d31c12 TH |
206 | doffset += GUE_PLEN_REMCSUM; |
207 | } | |
37dd0247 TH |
208 | } |
209 | ||
5024c33a TH |
210 | if (unlikely(guehdr->control)) |
211 | return gue_control_message(skb, guehdr); | |
212 | ||
4fd671de | 213 | __skb_pull(skb, sizeof(struct udphdr) + hdrlen); |
a8d31c12 TH |
214 | skb_reset_transport_header(skb); |
215 | ||
a09a4c8d JG |
216 | if (iptunnel_pull_offloads(skb)) |
217 | goto drop; | |
218 | ||
5024c33a TH |
219 | return -guehdr->proto_ctype; |
220 | ||
37dd0247 TH |
221 | drop: |
222 | kfree_skb(skb); | |
223 | return 0; | |
224 | } | |
225 | ||
d92283e3 TH |
226 | static struct sk_buff **fou_gro_receive(struct sock *sk, |
227 | struct sk_buff **head, | |
228 | struct sk_buff *skb) | |
afe93325 TH |
229 | { |
230 | const struct net_offload *ops; | |
231 | struct sk_buff **pp = NULL; | |
d92283e3 | 232 | u8 proto = fou_from_sock(sk)->protocol; |
efc98d08 | 233 | const struct net_offload **offloads; |
afe93325 | 234 | |
c3483384 AD |
235 | /* We can clear the encap_mark for FOU as we are essentially doing |
236 | * one of two possible things. We are either adding an L4 tunnel | |
237 | * header to the outer L3 tunnel header, or we are are simply | |
238 | * treating the GRE tunnel header as though it is a UDP protocol | |
239 | * specific header such as VXLAN or GENEVE. | |
240 | */ | |
241 | NAPI_GRO_CB(skb)->encap_mark = 0; | |
242 | ||
a0ca153f AD |
243 | /* Flag this frame as already having an outer encap header */ |
244 | NAPI_GRO_CB(skb)->is_fou = 1; | |
245 | ||
afe93325 | 246 | rcu_read_lock(); |
efc98d08 | 247 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
248 | ops = rcu_dereference(offloads[proto]); |
249 | if (!ops || !ops->callbacks.gro_receive) | |
250 | goto out_unlock; | |
251 | ||
fcd91dd4 | 252 | pp = call_gro_receive(ops->callbacks.gro_receive, head, skb); |
afe93325 TH |
253 | |
254 | out_unlock: | |
255 | rcu_read_unlock(); | |
256 | ||
257 | return pp; | |
258 | } | |
259 | ||
d92283e3 TH |
260 | static int fou_gro_complete(struct sock *sk, struct sk_buff *skb, |
261 | int nhoff) | |
afe93325 TH |
262 | { |
263 | const struct net_offload *ops; | |
d92283e3 | 264 | u8 proto = fou_from_sock(sk)->protocol; |
afe93325 | 265 | int err = -ENOSYS; |
efc98d08 | 266 | const struct net_offload **offloads; |
afe93325 TH |
267 | |
268 | rcu_read_lock(); | |
efc98d08 | 269 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
270 | ops = rcu_dereference(offloads[proto]); |
271 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
272 | goto out_unlock; | |
273 | ||
274 | err = ops->callbacks.gro_complete(skb, nhoff); | |
275 | ||
229740c6 JR |
276 | skb_set_inner_mac_header(skb, nhoff); |
277 | ||
afe93325 TH |
278 | out_unlock: |
279 | rcu_read_unlock(); | |
280 | ||
281 | return err; | |
282 | } | |
283 | ||
a8d31c12 TH |
284 | static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, |
285 | struct guehdr *guehdr, void *data, | |
b7fe10e5 TH |
286 | size_t hdrlen, struct gro_remcsum *grc, |
287 | bool nopartial) | |
a8d31c12 TH |
288 | { |
289 | __be16 *pd = data; | |
4fd671de TH |
290 | size_t start = ntohs(pd[0]); |
291 | size_t offset = ntohs(pd[1]); | |
a8d31c12 TH |
292 | |
293 | if (skb->remcsum_offload) | |
b7fe10e5 | 294 | return guehdr; |
a8d31c12 | 295 | |
4fd671de | 296 | if (!NAPI_GRO_CB(skb)->csum_valid) |
a8d31c12 TH |
297 | return NULL; |
298 | ||
b7fe10e5 TH |
299 | guehdr = skb_gro_remcsum_process(skb, (void *)guehdr, off, hdrlen, |
300 | start, offset, grc, nopartial); | |
a8d31c12 TH |
301 | |
302 | skb->remcsum_offload = 1; | |
303 | ||
304 | return guehdr; | |
305 | } | |
306 | ||
d92283e3 TH |
307 | static struct sk_buff **gue_gro_receive(struct sock *sk, |
308 | struct sk_buff **head, | |
309 | struct sk_buff *skb) | |
37dd0247 TH |
310 | { |
311 | const struct net_offload **offloads; | |
312 | const struct net_offload *ops; | |
313 | struct sk_buff **pp = NULL; | |
314 | struct sk_buff *p; | |
37dd0247 | 315 | struct guehdr *guehdr; |
5024c33a TH |
316 | size_t len, optlen, hdrlen, off; |
317 | void *data; | |
a8d31c12 | 318 | u16 doffset = 0; |
37dd0247 | 319 | int flush = 1; |
d92283e3 | 320 | struct fou *fou = fou_from_sock(sk); |
26c4f7da | 321 | struct gro_remcsum grc; |
c1e48af7 | 322 | u8 proto; |
26c4f7da TH |
323 | |
324 | skb_gro_remcsum_init(&grc); | |
37dd0247 TH |
325 | |
326 | off = skb_gro_offset(skb); | |
5024c33a TH |
327 | len = off + sizeof(*guehdr); |
328 | ||
37dd0247 | 329 | guehdr = skb_gro_header_fast(skb, off); |
5024c33a TH |
330 | if (skb_gro_header_hard(skb, len)) { |
331 | guehdr = skb_gro_header_slow(skb, len, off); | |
37dd0247 TH |
332 | if (unlikely(!guehdr)) |
333 | goto out; | |
334 | } | |
335 | ||
c1e48af7 TH |
336 | switch (guehdr->version) { |
337 | case 0: | |
338 | break; | |
339 | case 1: | |
340 | switch (((struct iphdr *)guehdr)->version) { | |
341 | case 4: | |
342 | proto = IPPROTO_IPIP; | |
343 | break; | |
344 | case 6: | |
345 | proto = IPPROTO_IPV6; | |
346 | break; | |
347 | default: | |
348 | goto out; | |
349 | } | |
350 | goto next_proto; | |
351 | default: | |
352 | goto out; | |
353 | } | |
354 | ||
5024c33a TH |
355 | optlen = guehdr->hlen << 2; |
356 | len += optlen; | |
37dd0247 | 357 | |
5024c33a TH |
358 | if (skb_gro_header_hard(skb, len)) { |
359 | guehdr = skb_gro_header_slow(skb, len, off); | |
360 | if (unlikely(!guehdr)) | |
361 | goto out; | |
362 | } | |
37dd0247 | 363 | |
5024c33a TH |
364 | if (unlikely(guehdr->control) || guehdr->version != 0 || |
365 | validate_gue_flags(guehdr, optlen)) | |
366 | goto out; | |
37dd0247 | 367 | |
5024c33a TH |
368 | hdrlen = sizeof(*guehdr) + optlen; |
369 | ||
a8d31c12 TH |
370 | /* Adjust NAPI_GRO_CB(skb)->csum to account for guehdr, |
371 | * this is needed if there is a remote checkcsum offload. | |
372 | */ | |
5024c33a TH |
373 | skb_gro_postpull_rcsum(skb, guehdr, hdrlen); |
374 | ||
375 | data = &guehdr[1]; | |
376 | ||
377 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 | 378 | __be32 flags = *(__be32 *)(data + doffset); |
5024c33a | 379 | |
a8d31c12 TH |
380 | doffset += GUE_LEN_PRIV; |
381 | ||
382 | if (flags & GUE_PFLAG_REMCSUM) { | |
383 | guehdr = gue_gro_remcsum(skb, off, guehdr, | |
b7fe10e5 | 384 | data + doffset, hdrlen, &grc, |
fe881ef1 TH |
385 | !!(fou->flags & |
386 | FOU_F_REMCSUM_NOPARTIAL)); | |
b7fe10e5 | 387 | |
a8d31c12 TH |
388 | if (!guehdr) |
389 | goto out; | |
390 | ||
391 | data = &guehdr[1]; | |
392 | ||
393 | doffset += GUE_PLEN_REMCSUM; | |
394 | } | |
37dd0247 TH |
395 | } |
396 | ||
a8d31c12 TH |
397 | skb_gro_pull(skb, hdrlen); |
398 | ||
37dd0247 TH |
399 | for (p = *head; p; p = p->next) { |
400 | const struct guehdr *guehdr2; | |
401 | ||
402 | if (!NAPI_GRO_CB(p)->same_flow) | |
403 | continue; | |
404 | ||
405 | guehdr2 = (struct guehdr *)(p->data + off); | |
406 | ||
407 | /* Compare base GUE header to be equal (covers | |
5024c33a | 408 | * hlen, version, proto_ctype, and flags. |
37dd0247 TH |
409 | */ |
410 | if (guehdr->word != guehdr2->word) { | |
411 | NAPI_GRO_CB(p)->same_flow = 0; | |
412 | continue; | |
413 | } | |
414 | ||
415 | /* Compare optional fields are the same. */ | |
416 | if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1], | |
417 | guehdr->hlen << 2)) { | |
418 | NAPI_GRO_CB(p)->same_flow = 0; | |
419 | continue; | |
420 | } | |
421 | } | |
422 | ||
c1e48af7 TH |
423 | proto = guehdr->proto_ctype; |
424 | ||
425 | next_proto: | |
426 | ||
c3483384 AD |
427 | /* We can clear the encap_mark for GUE as we are essentially doing |
428 | * one of two possible things. We are either adding an L4 tunnel | |
429 | * header to the outer L3 tunnel header, or we are are simply | |
430 | * treating the GRE tunnel header as though it is a UDP protocol | |
431 | * specific header such as VXLAN or GENEVE. | |
432 | */ | |
433 | NAPI_GRO_CB(skb)->encap_mark = 0; | |
434 | ||
a0ca153f AD |
435 | /* Flag this frame as already having an outer encap header */ |
436 | NAPI_GRO_CB(skb)->is_fou = 1; | |
437 | ||
5024c33a TH |
438 | rcu_read_lock(); |
439 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
c1e48af7 | 440 | ops = rcu_dereference(offloads[proto]); |
27013661 | 441 | if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive)) |
5024c33a | 442 | goto out_unlock; |
37dd0247 | 443 | |
fcd91dd4 | 444 | pp = call_gro_receive(ops->callbacks.gro_receive, head, skb); |
c194cf93 | 445 | flush = 0; |
37dd0247 TH |
446 | |
447 | out_unlock: | |
448 | rcu_read_unlock(); | |
449 | out: | |
450 | NAPI_GRO_CB(skb)->flush |= flush; | |
26c4f7da | 451 | skb_gro_remcsum_cleanup(skb, &grc); |
37dd0247 TH |
452 | |
453 | return pp; | |
454 | } | |
455 | ||
d92283e3 | 456 | static int gue_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) |
37dd0247 TH |
457 | { |
458 | const struct net_offload **offloads; | |
459 | struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff); | |
460 | const struct net_offload *ops; | |
c1e48af7 | 461 | unsigned int guehlen = 0; |
37dd0247 TH |
462 | u8 proto; |
463 | int err = -ENOENT; | |
464 | ||
c1e48af7 TH |
465 | switch (guehdr->version) { |
466 | case 0: | |
467 | proto = guehdr->proto_ctype; | |
468 | guehlen = sizeof(*guehdr) + (guehdr->hlen << 2); | |
469 | break; | |
470 | case 1: | |
471 | switch (((struct iphdr *)guehdr)->version) { | |
472 | case 4: | |
473 | proto = IPPROTO_IPIP; | |
474 | break; | |
475 | case 6: | |
476 | proto = IPPROTO_IPV6; | |
477 | break; | |
478 | default: | |
479 | return err; | |
480 | } | |
481 | break; | |
482 | default: | |
483 | return err; | |
484 | } | |
37dd0247 TH |
485 | |
486 | rcu_read_lock(); | |
487 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
488 | ops = rcu_dereference(offloads[proto]); | |
489 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
490 | goto out_unlock; | |
491 | ||
492 | err = ops->callbacks.gro_complete(skb, nhoff + guehlen); | |
493 | ||
229740c6 JR |
494 | skb_set_inner_mac_header(skb, nhoff + guehlen); |
495 | ||
37dd0247 TH |
496 | out_unlock: |
497 | rcu_read_unlock(); | |
498 | return err; | |
499 | } | |
500 | ||
02d793c5 | 501 | static int fou_add_to_port_list(struct net *net, struct fou *fou) |
23461551 | 502 | { |
02d793c5 | 503 | struct fou_net *fn = net_generic(net, fou_net_id); |
23461551 TH |
504 | struct fou *fout; |
505 | ||
02d793c5 WC |
506 | mutex_lock(&fn->fou_lock); |
507 | list_for_each_entry(fout, &fn->fou_list, list) { | |
5f914b68 TH |
508 | if (fou->port == fout->port && |
509 | fou->family == fout->family) { | |
02d793c5 | 510 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
511 | return -EALREADY; |
512 | } | |
513 | } | |
514 | ||
02d793c5 WC |
515 | list_add(&fou->list, &fn->fou_list); |
516 | mutex_unlock(&fn->fou_lock); | |
23461551 TH |
517 | |
518 | return 0; | |
519 | } | |
520 | ||
521 | static void fou_release(struct fou *fou) | |
522 | { | |
523 | struct socket *sock = fou->sock; | |
23461551 | 524 | |
23461551 | 525 | list_del(&fou->list); |
02d793c5 | 526 | udp_tunnel_sock_release(sock); |
23461551 | 527 | |
3036facb | 528 | kfree_rcu(fou, rcu); |
23461551 TH |
529 | } |
530 | ||
531 | static int fou_create(struct net *net, struct fou_cfg *cfg, | |
532 | struct socket **sockp) | |
533 | { | |
23461551 | 534 | struct socket *sock = NULL; |
02d793c5 | 535 | struct fou *fou = NULL; |
23461551 | 536 | struct sock *sk; |
440924bb | 537 | struct udp_tunnel_sock_cfg tunnel_cfg; |
02d793c5 | 538 | int err; |
23461551 TH |
539 | |
540 | /* Open UDP socket */ | |
541 | err = udp_sock_create(net, &cfg->udp_config, &sock); | |
542 | if (err < 0) | |
543 | goto error; | |
544 | ||
545 | /* Allocate FOU port structure */ | |
546 | fou = kzalloc(sizeof(*fou), GFP_KERNEL); | |
547 | if (!fou) { | |
548 | err = -ENOMEM; | |
549 | goto error; | |
550 | } | |
551 | ||
552 | sk = sock->sk; | |
553 | ||
37dd0247 | 554 | fou->port = cfg->udp_config.local_udp_port; |
5f914b68 TH |
555 | fou->family = cfg->udp_config.family; |
556 | fou->flags = cfg->flags; | |
440924bb TH |
557 | fou->type = cfg->type; |
558 | fou->sock = sock; | |
559 | ||
560 | memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); | |
561 | tunnel_cfg.encap_type = 1; | |
562 | tunnel_cfg.sk_user_data = fou; | |
563 | tunnel_cfg.encap_destroy = NULL; | |
37dd0247 TH |
564 | |
565 | /* Initial for fou type */ | |
566 | switch (cfg->type) { | |
567 | case FOU_ENCAP_DIRECT: | |
440924bb TH |
568 | tunnel_cfg.encap_rcv = fou_udp_recv; |
569 | tunnel_cfg.gro_receive = fou_gro_receive; | |
570 | tunnel_cfg.gro_complete = fou_gro_complete; | |
571 | fou->protocol = cfg->protocol; | |
37dd0247 TH |
572 | break; |
573 | case FOU_ENCAP_GUE: | |
440924bb TH |
574 | tunnel_cfg.encap_rcv = gue_udp_recv; |
575 | tunnel_cfg.gro_receive = gue_gro_receive; | |
576 | tunnel_cfg.gro_complete = gue_gro_complete; | |
37dd0247 TH |
577 | break; |
578 | default: | |
579 | err = -EINVAL; | |
580 | goto error; | |
581 | } | |
23461551 | 582 | |
440924bb | 583 | setup_udp_tunnel_sock(net, sock, &tunnel_cfg); |
23461551 TH |
584 | |
585 | sk->sk_allocation = GFP_ATOMIC; | |
586 | ||
02d793c5 | 587 | err = fou_add_to_port_list(net, fou); |
23461551 TH |
588 | if (err) |
589 | goto error; | |
590 | ||
591 | if (sockp) | |
592 | *sockp = sock; | |
593 | ||
594 | return 0; | |
595 | ||
596 | error: | |
597 | kfree(fou); | |
598 | if (sock) | |
02d793c5 | 599 | udp_tunnel_sock_release(sock); |
23461551 TH |
600 | |
601 | return err; | |
602 | } | |
603 | ||
604 | static int fou_destroy(struct net *net, struct fou_cfg *cfg) | |
605 | { | |
02d793c5 | 606 | struct fou_net *fn = net_generic(net, fou_net_id); |
4cbcdf2b | 607 | __be16 port = cfg->udp_config.local_udp_port; |
5f914b68 | 608 | u8 family = cfg->udp_config.family; |
23461551 | 609 | int err = -EINVAL; |
02d793c5 | 610 | struct fou *fou; |
23461551 | 611 | |
02d793c5 WC |
612 | mutex_lock(&fn->fou_lock); |
613 | list_for_each_entry(fou, &fn->fou_list, list) { | |
5f914b68 | 614 | if (fou->port == port && fou->family == family) { |
23461551 TH |
615 | fou_release(fou); |
616 | err = 0; | |
617 | break; | |
618 | } | |
619 | } | |
02d793c5 | 620 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
621 | |
622 | return err; | |
623 | } | |
624 | ||
489111e5 | 625 | static struct genl_family fou_nl_family; |
23461551 | 626 | |
3f18ff2b | 627 | static const struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = { |
23461551 TH |
628 | [FOU_ATTR_PORT] = { .type = NLA_U16, }, |
629 | [FOU_ATTR_AF] = { .type = NLA_U8, }, | |
630 | [FOU_ATTR_IPPROTO] = { .type = NLA_U8, }, | |
37dd0247 | 631 | [FOU_ATTR_TYPE] = { .type = NLA_U8, }, |
fe881ef1 | 632 | [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, }, |
23461551 TH |
633 | }; |
634 | ||
635 | static int parse_nl_config(struct genl_info *info, | |
636 | struct fou_cfg *cfg) | |
637 | { | |
638 | memset(cfg, 0, sizeof(*cfg)); | |
639 | ||
640 | cfg->udp_config.family = AF_INET; | |
641 | ||
642 | if (info->attrs[FOU_ATTR_AF]) { | |
643 | u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]); | |
644 | ||
5f914b68 TH |
645 | switch (family) { |
646 | case AF_INET: | |
647 | break; | |
648 | case AF_INET6: | |
649 | cfg->udp_config.ipv6_v6only = 1; | |
650 | break; | |
651 | default: | |
652 | return -EAFNOSUPPORT; | |
653 | } | |
23461551 TH |
654 | |
655 | cfg->udp_config.family = family; | |
656 | } | |
657 | ||
658 | if (info->attrs[FOU_ATTR_PORT]) { | |
4cbcdf2b | 659 | __be16 port = nla_get_be16(info->attrs[FOU_ATTR_PORT]); |
23461551 TH |
660 | |
661 | cfg->udp_config.local_udp_port = port; | |
662 | } | |
663 | ||
664 | if (info->attrs[FOU_ATTR_IPPROTO]) | |
665 | cfg->protocol = nla_get_u8(info->attrs[FOU_ATTR_IPPROTO]); | |
666 | ||
37dd0247 TH |
667 | if (info->attrs[FOU_ATTR_TYPE]) |
668 | cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]); | |
669 | ||
fe881ef1 TH |
670 | if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL]) |
671 | cfg->flags |= FOU_F_REMCSUM_NOPARTIAL; | |
672 | ||
23461551 TH |
673 | return 0; |
674 | } | |
675 | ||
676 | static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info) | |
677 | { | |
02d793c5 | 678 | struct net *net = genl_info_net(info); |
23461551 TH |
679 | struct fou_cfg cfg; |
680 | int err; | |
681 | ||
682 | err = parse_nl_config(info, &cfg); | |
683 | if (err) | |
684 | return err; | |
685 | ||
02d793c5 | 686 | return fou_create(net, &cfg, NULL); |
23461551 TH |
687 | } |
688 | ||
689 | static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info) | |
690 | { | |
02d793c5 | 691 | struct net *net = genl_info_net(info); |
23461551 | 692 | struct fou_cfg cfg; |
67270636 | 693 | int err; |
23461551 | 694 | |
67270636 WC |
695 | err = parse_nl_config(info, &cfg); |
696 | if (err) | |
697 | return err; | |
23461551 | 698 | |
02d793c5 | 699 | return fou_destroy(net, &cfg); |
23461551 TH |
700 | } |
701 | ||
7a6c8c34 WC |
702 | static int fou_fill_info(struct fou *fou, struct sk_buff *msg) |
703 | { | |
704 | if (nla_put_u8(msg, FOU_ATTR_AF, fou->sock->sk->sk_family) || | |
705 | nla_put_be16(msg, FOU_ATTR_PORT, fou->port) || | |
706 | nla_put_u8(msg, FOU_ATTR_IPPROTO, fou->protocol) || | |
707 | nla_put_u8(msg, FOU_ATTR_TYPE, fou->type)) | |
708 | return -1; | |
709 | ||
710 | if (fou->flags & FOU_F_REMCSUM_NOPARTIAL) | |
711 | if (nla_put_flag(msg, FOU_ATTR_REMCSUM_NOPARTIAL)) | |
712 | return -1; | |
713 | return 0; | |
714 | } | |
715 | ||
716 | static int fou_dump_info(struct fou *fou, u32 portid, u32 seq, | |
717 | u32 flags, struct sk_buff *skb, u8 cmd) | |
718 | { | |
719 | void *hdr; | |
720 | ||
721 | hdr = genlmsg_put(skb, portid, seq, &fou_nl_family, flags, cmd); | |
722 | if (!hdr) | |
723 | return -ENOMEM; | |
724 | ||
725 | if (fou_fill_info(fou, skb) < 0) | |
726 | goto nla_put_failure; | |
727 | ||
728 | genlmsg_end(skb, hdr); | |
729 | return 0; | |
730 | ||
731 | nla_put_failure: | |
732 | genlmsg_cancel(skb, hdr); | |
733 | return -EMSGSIZE; | |
734 | } | |
735 | ||
736 | static int fou_nl_cmd_get_port(struct sk_buff *skb, struct genl_info *info) | |
737 | { | |
738 | struct net *net = genl_info_net(info); | |
739 | struct fou_net *fn = net_generic(net, fou_net_id); | |
740 | struct sk_buff *msg; | |
741 | struct fou_cfg cfg; | |
742 | struct fou *fout; | |
743 | __be16 port; | |
5f914b68 | 744 | u8 family; |
7a6c8c34 WC |
745 | int ret; |
746 | ||
747 | ret = parse_nl_config(info, &cfg); | |
748 | if (ret) | |
749 | return ret; | |
750 | port = cfg.udp_config.local_udp_port; | |
751 | if (port == 0) | |
752 | return -EINVAL; | |
753 | ||
5f914b68 TH |
754 | family = cfg.udp_config.family; |
755 | if (family != AF_INET && family != AF_INET6) | |
756 | return -EINVAL; | |
757 | ||
7a6c8c34 WC |
758 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
759 | if (!msg) | |
760 | return -ENOMEM; | |
761 | ||
762 | ret = -ESRCH; | |
763 | mutex_lock(&fn->fou_lock); | |
764 | list_for_each_entry(fout, &fn->fou_list, list) { | |
5f914b68 | 765 | if (port == fout->port && family == fout->family) { |
7a6c8c34 WC |
766 | ret = fou_dump_info(fout, info->snd_portid, |
767 | info->snd_seq, 0, msg, | |
768 | info->genlhdr->cmd); | |
769 | break; | |
770 | } | |
771 | } | |
772 | mutex_unlock(&fn->fou_lock); | |
773 | if (ret < 0) | |
774 | goto out_free; | |
775 | ||
776 | return genlmsg_reply(msg, info); | |
777 | ||
778 | out_free: | |
779 | nlmsg_free(msg); | |
780 | return ret; | |
781 | } | |
782 | ||
783 | static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
784 | { | |
785 | struct net *net = sock_net(skb->sk); | |
786 | struct fou_net *fn = net_generic(net, fou_net_id); | |
787 | struct fou *fout; | |
788 | int idx = 0, ret; | |
789 | ||
790 | mutex_lock(&fn->fou_lock); | |
791 | list_for_each_entry(fout, &fn->fou_list, list) { | |
792 | if (idx++ < cb->args[0]) | |
793 | continue; | |
794 | ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid, | |
795 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
796 | skb, FOU_CMD_GET); | |
797 | if (ret) | |
540207ae | 798 | break; |
7a6c8c34 WC |
799 | } |
800 | mutex_unlock(&fn->fou_lock); | |
801 | ||
7a6c8c34 WC |
802 | cb->args[0] = idx; |
803 | return skb->len; | |
804 | } | |
805 | ||
23461551 TH |
806 | static const struct genl_ops fou_nl_ops[] = { |
807 | { | |
808 | .cmd = FOU_CMD_ADD, | |
809 | .doit = fou_nl_cmd_add_port, | |
810 | .policy = fou_nl_policy, | |
811 | .flags = GENL_ADMIN_PERM, | |
812 | }, | |
813 | { | |
814 | .cmd = FOU_CMD_DEL, | |
815 | .doit = fou_nl_cmd_rm_port, | |
816 | .policy = fou_nl_policy, | |
817 | .flags = GENL_ADMIN_PERM, | |
818 | }, | |
7a6c8c34 WC |
819 | { |
820 | .cmd = FOU_CMD_GET, | |
821 | .doit = fou_nl_cmd_get_port, | |
822 | .dumpit = fou_nl_dump, | |
823 | .policy = fou_nl_policy, | |
824 | }, | |
23461551 TH |
825 | }; |
826 | ||
56989f6d | 827 | static struct genl_family fou_nl_family __ro_after_init = { |
489111e5 JB |
828 | .hdrsize = 0, |
829 | .name = FOU_GENL_NAME, | |
830 | .version = FOU_GENL_VERSION, | |
831 | .maxattr = FOU_ATTR_MAX, | |
832 | .netnsok = true, | |
833 | .module = THIS_MODULE, | |
834 | .ops = fou_nl_ops, | |
835 | .n_ops = ARRAY_SIZE(fou_nl_ops), | |
836 | }; | |
837 | ||
a8c5f90f TH |
838 | size_t fou_encap_hlen(struct ip_tunnel_encap *e) |
839 | { | |
840 | return sizeof(struct udphdr); | |
841 | } | |
842 | EXPORT_SYMBOL(fou_encap_hlen); | |
843 | ||
844 | size_t gue_encap_hlen(struct ip_tunnel_encap *e) | |
845 | { | |
846 | size_t len; | |
847 | bool need_priv = false; | |
848 | ||
849 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
850 | ||
851 | if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) { | |
852 | len += GUE_PLEN_REMCSUM; | |
853 | need_priv = true; | |
854 | } | |
855 | ||
856 | len += need_priv ? GUE_LEN_PRIV : 0; | |
857 | ||
858 | return len; | |
859 | } | |
860 | EXPORT_SYMBOL(gue_encap_hlen); | |
861 | ||
63487bab TH |
862 | static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e, |
863 | struct flowi4 *fl4, u8 *protocol, __be16 sport) | |
864 | { | |
865 | struct udphdr *uh; | |
866 | ||
867 | skb_push(skb, sizeof(struct udphdr)); | |
868 | skb_reset_transport_header(skb); | |
869 | ||
870 | uh = udp_hdr(skb); | |
871 | ||
872 | uh->dest = e->dport; | |
873 | uh->source = sport; | |
874 | uh->len = htons(skb->len); | |
63487bab TH |
875 | udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb, |
876 | fl4->saddr, fl4->daddr, skb->len); | |
877 | ||
878 | *protocol = IPPROTO_UDP; | |
879 | } | |
880 | ||
dc969b81 TH |
881 | int __fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, |
882 | u8 *protocol, __be16 *sport, int type) | |
883 | { | |
884 | int err; | |
885 | ||
886 | err = iptunnel_handle_offloads(skb, type); | |
887 | if (err) | |
888 | return err; | |
889 | ||
890 | *sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
891 | skb, 0, 0, false); | |
892 | ||
893 | return 0; | |
894 | } | |
895 | EXPORT_SYMBOL(__fou_build_header); | |
896 | ||
63487bab TH |
897 | int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, |
898 | u8 *protocol, struct flowi4 *fl4) | |
899 | { | |
06f62292 EC |
900 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM : |
901 | SKB_GSO_UDP_TUNNEL; | |
63487bab | 902 | __be16 sport; |
aed069df | 903 | int err; |
63487bab | 904 | |
dc969b81 | 905 | err = __fou_build_header(skb, e, protocol, &sport, type); |
aed069df AD |
906 | if (err) |
907 | return err; | |
63487bab | 908 | |
63487bab TH |
909 | fou_build_udp(skb, e, fl4, protocol, sport); |
910 | ||
911 | return 0; | |
912 | } | |
913 | EXPORT_SYMBOL(fou_build_header); | |
914 | ||
dc969b81 TH |
915 | int __gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, |
916 | u8 *protocol, __be16 *sport, int type) | |
63487bab | 917 | { |
63487bab | 918 | struct guehdr *guehdr; |
b17f709a | 919 | size_t hdrlen, optlen = 0; |
5024c33a TH |
920 | void *data; |
921 | bool need_priv = false; | |
aed069df | 922 | int err; |
5024c33a | 923 | |
b17f709a TH |
924 | if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) && |
925 | skb->ip_summed == CHECKSUM_PARTIAL) { | |
b17f709a TH |
926 | optlen += GUE_PLEN_REMCSUM; |
927 | type |= SKB_GSO_TUNNEL_REMCSUM; | |
928 | need_priv = true; | |
929 | } | |
930 | ||
5024c33a | 931 | optlen += need_priv ? GUE_LEN_PRIV : 0; |
63487bab | 932 | |
aed069df AD |
933 | err = iptunnel_handle_offloads(skb, type); |
934 | if (err) | |
935 | return err; | |
63487bab TH |
936 | |
937 | /* Get source port (based on flow hash) before skb_push */ | |
dc969b81 TH |
938 | *sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), |
939 | skb, 0, 0, false); | |
63487bab | 940 | |
b17f709a TH |
941 | hdrlen = sizeof(struct guehdr) + optlen; |
942 | ||
943 | skb_push(skb, hdrlen); | |
63487bab TH |
944 | |
945 | guehdr = (struct guehdr *)skb->data; | |
946 | ||
5024c33a | 947 | guehdr->control = 0; |
63487bab | 948 | guehdr->version = 0; |
5024c33a | 949 | guehdr->hlen = optlen >> 2; |
63487bab | 950 | guehdr->flags = 0; |
5024c33a TH |
951 | guehdr->proto_ctype = *protocol; |
952 | ||
953 | data = &guehdr[1]; | |
954 | ||
955 | if (need_priv) { | |
956 | __be32 *flags = data; | |
957 | ||
958 | guehdr->flags |= GUE_FLAG_PRIV; | |
959 | *flags = 0; | |
960 | data += GUE_LEN_PRIV; | |
961 | ||
b17f709a TH |
962 | if (type & SKB_GSO_TUNNEL_REMCSUM) { |
963 | u16 csum_start = skb_checksum_start_offset(skb); | |
964 | __be16 *pd = data; | |
965 | ||
966 | if (csum_start < hdrlen) | |
967 | return -EINVAL; | |
968 | ||
969 | csum_start -= hdrlen; | |
970 | pd[0] = htons(csum_start); | |
971 | pd[1] = htons(csum_start + skb->csum_offset); | |
972 | ||
973 | if (!skb_is_gso(skb)) { | |
974 | skb->ip_summed = CHECKSUM_NONE; | |
975 | skb->encapsulation = 0; | |
976 | } | |
977 | ||
978 | *flags |= GUE_PFLAG_REMCSUM; | |
979 | data += GUE_PLEN_REMCSUM; | |
980 | } | |
981 | ||
5024c33a | 982 | } |
63487bab | 983 | |
dc969b81 TH |
984 | return 0; |
985 | } | |
986 | EXPORT_SYMBOL(__gue_build_header); | |
987 | ||
988 | int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
989 | u8 *protocol, struct flowi4 *fl4) | |
990 | { | |
991 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM : | |
992 | SKB_GSO_UDP_TUNNEL; | |
993 | __be16 sport; | |
994 | int err; | |
995 | ||
996 | err = __gue_build_header(skb, e, protocol, &sport, type); | |
997 | if (err) | |
998 | return err; | |
999 | ||
63487bab TH |
1000 | fou_build_udp(skb, e, fl4, protocol, sport); |
1001 | ||
1002 | return 0; | |
1003 | } | |
1004 | EXPORT_SYMBOL(gue_build_header); | |
1005 | ||
a8c5f90f TH |
1006 | #ifdef CONFIG_NET_FOU_IP_TUNNELS |
1007 | ||
5eeb2922 | 1008 | static const struct ip_tunnel_encap_ops fou_iptun_ops = { |
a8c5f90f TH |
1009 | .encap_hlen = fou_encap_hlen, |
1010 | .build_header = fou_build_header, | |
1011 | }; | |
1012 | ||
5eeb2922 | 1013 | static const struct ip_tunnel_encap_ops gue_iptun_ops = { |
a8c5f90f TH |
1014 | .encap_hlen = gue_encap_hlen, |
1015 | .build_header = gue_build_header, | |
1016 | }; | |
1017 | ||
1018 | static int ip_tunnel_encap_add_fou_ops(void) | |
1019 | { | |
1020 | int ret; | |
1021 | ||
1022 | ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
1023 | if (ret < 0) { | |
1024 | pr_err("can't add fou ops\n"); | |
1025 | return ret; | |
1026 | } | |
1027 | ||
1028 | ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
1029 | if (ret < 0) { | |
1030 | pr_err("can't add gue ops\n"); | |
1031 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
1032 | return ret; | |
1033 | } | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | static void ip_tunnel_encap_del_fou_ops(void) | |
1039 | { | |
1040 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
1041 | ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
1042 | } | |
1043 | ||
1044 | #else | |
1045 | ||
1046 | static int ip_tunnel_encap_add_fou_ops(void) | |
1047 | { | |
1048 | return 0; | |
1049 | } | |
1050 | ||
882288c0 | 1051 | static void ip_tunnel_encap_del_fou_ops(void) |
a8c5f90f TH |
1052 | { |
1053 | } | |
1054 | ||
1055 | #endif | |
1056 | ||
02d793c5 WC |
1057 | static __net_init int fou_init_net(struct net *net) |
1058 | { | |
1059 | struct fou_net *fn = net_generic(net, fou_net_id); | |
1060 | ||
1061 | INIT_LIST_HEAD(&fn->fou_list); | |
1062 | mutex_init(&fn->fou_lock); | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | static __net_exit void fou_exit_net(struct net *net) | |
1067 | { | |
1068 | struct fou_net *fn = net_generic(net, fou_net_id); | |
1069 | struct fou *fou, *next; | |
1070 | ||
1071 | /* Close all the FOU sockets */ | |
1072 | mutex_lock(&fn->fou_lock); | |
1073 | list_for_each_entry_safe(fou, next, &fn->fou_list, list) | |
1074 | fou_release(fou); | |
1075 | mutex_unlock(&fn->fou_lock); | |
1076 | } | |
1077 | ||
1078 | static struct pernet_operations fou_net_ops = { | |
1079 | .init = fou_init_net, | |
1080 | .exit = fou_exit_net, | |
1081 | .id = &fou_net_id, | |
1082 | .size = sizeof(struct fou_net), | |
1083 | }; | |
1084 | ||
23461551 TH |
1085 | static int __init fou_init(void) |
1086 | { | |
1087 | int ret; | |
1088 | ||
02d793c5 WC |
1089 | ret = register_pernet_device(&fou_net_ops); |
1090 | if (ret) | |
1091 | goto exit; | |
1092 | ||
489111e5 | 1093 | ret = genl_register_family(&fou_nl_family); |
a8c5f90f | 1094 | if (ret < 0) |
02d793c5 | 1095 | goto unregister; |
a8c5f90f TH |
1096 | |
1097 | ret = ip_tunnel_encap_add_fou_ops(); | |
02d793c5 WC |
1098 | if (ret == 0) |
1099 | return 0; | |
a8c5f90f | 1100 | |
02d793c5 WC |
1101 | genl_unregister_family(&fou_nl_family); |
1102 | unregister: | |
1103 | unregister_pernet_device(&fou_net_ops); | |
a8c5f90f | 1104 | exit: |
23461551 TH |
1105 | return ret; |
1106 | } | |
1107 | ||
1108 | static void __exit fou_fini(void) | |
1109 | { | |
a8c5f90f | 1110 | ip_tunnel_encap_del_fou_ops(); |
23461551 | 1111 | genl_unregister_family(&fou_nl_family); |
02d793c5 | 1112 | unregister_pernet_device(&fou_net_ops); |
23461551 TH |
1113 | } |
1114 | ||
1115 | module_init(fou_init); | |
1116 | module_exit(fou_fini); | |
1117 | MODULE_AUTHOR("Tom Herbert <therbert@google.com>"); | |
1118 | MODULE_LICENSE("GPL"); |