Commit | Line | Data |
---|---|---|
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 | ||
19 | static DEFINE_SPINLOCK(fou_lock); | |
20 | static LIST_HEAD(fou_list); | |
21 | ||
22 | struct fou { | |
23 | struct socket *sock; | |
24 | u8 protocol; | |
fe881ef1 | 25 | u8 flags; |
23461551 | 26 | u16 port; |
afe93325 | 27 | struct udp_offload udp_offloads; |
23461551 TH |
28 | struct list_head list; |
29 | }; | |
30 | ||
fe881ef1 TH |
31 | #define FOU_F_REMCSUM_NOPARTIAL BIT(0) |
32 | ||
23461551 | 33 | struct fou_cfg { |
37dd0247 | 34 | u16 type; |
23461551 | 35 | u8 protocol; |
fe881ef1 | 36 | u8 flags; |
23461551 TH |
37 | struct udp_port_cfg udp_config; |
38 | }; | |
39 | ||
40 | static inline struct fou *fou_from_sock(struct sock *sk) | |
41 | { | |
42 | return sk->sk_user_data; | |
43 | } | |
44 | ||
5024c33a | 45 | static void fou_recv_pull(struct sk_buff *skb, size_t len) |
23461551 TH |
46 | { |
47 | struct iphdr *iph = ip_hdr(skb); | |
48 | ||
49 | /* Remove 'len' bytes from the packet (UDP header and | |
5024c33a | 50 | * FOU header if present). |
23461551 TH |
51 | */ |
52 | iph->tot_len = htons(ntohs(iph->tot_len) - len); | |
53 | __skb_pull(skb, len); | |
54 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
55 | skb_reset_transport_header(skb); | |
23461551 TH |
56 | } |
57 | ||
58 | static int fou_udp_recv(struct sock *sk, struct sk_buff *skb) | |
59 | { | |
60 | struct fou *fou = fou_from_sock(sk); | |
61 | ||
62 | if (!fou) | |
63 | return 1; | |
64 | ||
5024c33a TH |
65 | fou_recv_pull(skb, sizeof(struct udphdr)); |
66 | ||
67 | return -fou->protocol; | |
68 | } | |
69 | ||
a8d31c12 | 70 | static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr, |
fe881ef1 TH |
71 | void *data, size_t hdrlen, u8 ipproto, |
72 | bool nopartial) | |
a8d31c12 TH |
73 | { |
74 | __be16 *pd = data; | |
4fd671de TH |
75 | size_t start = ntohs(pd[0]); |
76 | size_t offset = ntohs(pd[1]); | |
77 | size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start); | |
a8d31c12 | 78 | |
a8d31c12 TH |
79 | if (!pskb_may_pull(skb, plen)) |
80 | return NULL; | |
81 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
82 | ||
fe881ef1 TH |
83 | skb_remcsum_process(skb, (void *)guehdr + hdrlen, |
84 | start, offset, nopartial); | |
a8d31c12 TH |
85 | |
86 | return guehdr; | |
87 | } | |
88 | ||
5024c33a TH |
89 | static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr) |
90 | { | |
91 | /* No support yet */ | |
92 | kfree_skb(skb); | |
93 | return 0; | |
23461551 TH |
94 | } |
95 | ||
37dd0247 TH |
96 | static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) |
97 | { | |
98 | struct fou *fou = fou_from_sock(sk); | |
5024c33a | 99 | size_t len, optlen, hdrlen; |
37dd0247 | 100 | struct guehdr *guehdr; |
5024c33a | 101 | void *data; |
a8d31c12 | 102 | u16 doffset = 0; |
37dd0247 TH |
103 | |
104 | if (!fou) | |
105 | return 1; | |
106 | ||
107 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
108 | if (!pskb_may_pull(skb, len)) | |
109 | goto drop; | |
110 | ||
5024c33a TH |
111 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; |
112 | ||
113 | optlen = guehdr->hlen << 2; | |
114 | len += optlen; | |
37dd0247 | 115 | |
37dd0247 TH |
116 | if (!pskb_may_pull(skb, len)) |
117 | goto drop; | |
118 | ||
5024c33a TH |
119 | /* guehdr may change after pull */ |
120 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
d8f00d27 | 121 | |
5024c33a | 122 | hdrlen = sizeof(struct guehdr) + optlen; |
37dd0247 | 123 | |
5024c33a | 124 | if (guehdr->version != 0 || validate_gue_flags(guehdr, optlen)) |
37dd0247 | 125 | goto drop; |
5024c33a | 126 | |
a8d31c12 TH |
127 | hdrlen = sizeof(struct guehdr) + optlen; |
128 | ||
129 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len); | |
130 | ||
a8d31c12 TH |
131 | /* Pull csum through the guehdr now . This can be used if |
132 | * there is a remote checksum offload. | |
133 | */ | |
134 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
5024c33a TH |
135 | |
136 | data = &guehdr[1]; | |
137 | ||
138 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 TH |
139 | __be32 flags = *(__be32 *)(data + doffset); |
140 | ||
141 | doffset += GUE_LEN_PRIV; | |
142 | ||
143 | if (flags & GUE_PFLAG_REMCSUM) { | |
144 | guehdr = gue_remcsum(skb, guehdr, data + doffset, | |
fe881ef1 TH |
145 | hdrlen, guehdr->proto_ctype, |
146 | !!(fou->flags & | |
147 | FOU_F_REMCSUM_NOPARTIAL)); | |
a8d31c12 TH |
148 | if (!guehdr) |
149 | goto drop; | |
150 | ||
151 | data = &guehdr[1]; | |
5024c33a | 152 | |
a8d31c12 TH |
153 | doffset += GUE_PLEN_REMCSUM; |
154 | } | |
37dd0247 TH |
155 | } |
156 | ||
5024c33a TH |
157 | if (unlikely(guehdr->control)) |
158 | return gue_control_message(skb, guehdr); | |
159 | ||
4fd671de | 160 | __skb_pull(skb, sizeof(struct udphdr) + hdrlen); |
a8d31c12 TH |
161 | skb_reset_transport_header(skb); |
162 | ||
5024c33a TH |
163 | return -guehdr->proto_ctype; |
164 | ||
37dd0247 TH |
165 | drop: |
166 | kfree_skb(skb); | |
167 | return 0; | |
168 | } | |
169 | ||
afe93325 | 170 | static struct sk_buff **fou_gro_receive(struct sk_buff **head, |
a2b12f3c TH |
171 | struct sk_buff *skb, |
172 | struct udp_offload *uoff) | |
afe93325 TH |
173 | { |
174 | const struct net_offload *ops; | |
175 | struct sk_buff **pp = NULL; | |
176 | u8 proto = NAPI_GRO_CB(skb)->proto; | |
efc98d08 | 177 | const struct net_offload **offloads; |
afe93325 TH |
178 | |
179 | rcu_read_lock(); | |
efc98d08 | 180 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
181 | ops = rcu_dereference(offloads[proto]); |
182 | if (!ops || !ops->callbacks.gro_receive) | |
183 | goto out_unlock; | |
184 | ||
185 | pp = ops->callbacks.gro_receive(head, skb); | |
186 | ||
187 | out_unlock: | |
188 | rcu_read_unlock(); | |
189 | ||
190 | return pp; | |
191 | } | |
192 | ||
a2b12f3c TH |
193 | static int fou_gro_complete(struct sk_buff *skb, int nhoff, |
194 | struct udp_offload *uoff) | |
afe93325 TH |
195 | { |
196 | const struct net_offload *ops; | |
197 | u8 proto = NAPI_GRO_CB(skb)->proto; | |
198 | int err = -ENOSYS; | |
efc98d08 | 199 | const struct net_offload **offloads; |
afe93325 | 200 | |
cfdf1e1b JG |
201 | udp_tunnel_gro_complete(skb, nhoff); |
202 | ||
afe93325 | 203 | rcu_read_lock(); |
efc98d08 | 204 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
205 | ops = rcu_dereference(offloads[proto]); |
206 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
207 | goto out_unlock; | |
208 | ||
209 | err = ops->callbacks.gro_complete(skb, nhoff); | |
210 | ||
211 | out_unlock: | |
212 | rcu_read_unlock(); | |
213 | ||
214 | return err; | |
215 | } | |
216 | ||
a8d31c12 TH |
217 | static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, |
218 | struct guehdr *guehdr, void *data, | |
26c4f7da | 219 | size_t hdrlen, u8 ipproto, |
fe881ef1 | 220 | struct gro_remcsum *grc, bool nopartial) |
a8d31c12 TH |
221 | { |
222 | __be16 *pd = data; | |
4fd671de TH |
223 | size_t start = ntohs(pd[0]); |
224 | size_t offset = ntohs(pd[1]); | |
225 | size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start); | |
a8d31c12 TH |
226 | |
227 | if (skb->remcsum_offload) | |
26c4f7da | 228 | return NULL; |
a8d31c12 | 229 | |
4fd671de | 230 | if (!NAPI_GRO_CB(skb)->csum_valid) |
a8d31c12 TH |
231 | return NULL; |
232 | ||
a8d31c12 TH |
233 | /* Pull checksum that will be written */ |
234 | if (skb_gro_header_hard(skb, off + plen)) { | |
235 | guehdr = skb_gro_header_slow(skb, off + plen, off); | |
236 | if (!guehdr) | |
237 | return NULL; | |
238 | } | |
239 | ||
26c4f7da | 240 | skb_gro_remcsum_process(skb, (void *)guehdr + hdrlen, |
fe881ef1 | 241 | start, offset, grc, nopartial); |
a8d31c12 TH |
242 | |
243 | skb->remcsum_offload = 1; | |
244 | ||
245 | return guehdr; | |
246 | } | |
247 | ||
37dd0247 | 248 | static struct sk_buff **gue_gro_receive(struct sk_buff **head, |
a2b12f3c TH |
249 | struct sk_buff *skb, |
250 | struct udp_offload *uoff) | |
37dd0247 TH |
251 | { |
252 | const struct net_offload **offloads; | |
253 | const struct net_offload *ops; | |
254 | struct sk_buff **pp = NULL; | |
255 | struct sk_buff *p; | |
37dd0247 | 256 | struct guehdr *guehdr; |
5024c33a TH |
257 | size_t len, optlen, hdrlen, off; |
258 | void *data; | |
a8d31c12 | 259 | u16 doffset = 0; |
37dd0247 | 260 | int flush = 1; |
fe881ef1 | 261 | struct fou *fou = container_of(uoff, struct fou, udp_offloads); |
26c4f7da TH |
262 | struct gro_remcsum grc; |
263 | ||
264 | skb_gro_remcsum_init(&grc); | |
37dd0247 TH |
265 | |
266 | off = skb_gro_offset(skb); | |
5024c33a TH |
267 | len = off + sizeof(*guehdr); |
268 | ||
37dd0247 | 269 | guehdr = skb_gro_header_fast(skb, off); |
5024c33a TH |
270 | if (skb_gro_header_hard(skb, len)) { |
271 | guehdr = skb_gro_header_slow(skb, len, off); | |
37dd0247 TH |
272 | if (unlikely(!guehdr)) |
273 | goto out; | |
274 | } | |
275 | ||
5024c33a TH |
276 | optlen = guehdr->hlen << 2; |
277 | len += optlen; | |
37dd0247 | 278 | |
5024c33a TH |
279 | if (skb_gro_header_hard(skb, len)) { |
280 | guehdr = skb_gro_header_slow(skb, len, off); | |
281 | if (unlikely(!guehdr)) | |
282 | goto out; | |
283 | } | |
37dd0247 | 284 | |
5024c33a TH |
285 | if (unlikely(guehdr->control) || guehdr->version != 0 || |
286 | validate_gue_flags(guehdr, optlen)) | |
287 | goto out; | |
37dd0247 | 288 | |
5024c33a TH |
289 | hdrlen = sizeof(*guehdr) + optlen; |
290 | ||
a8d31c12 TH |
291 | /* Adjust NAPI_GRO_CB(skb)->csum to account for guehdr, |
292 | * this is needed if there is a remote checkcsum offload. | |
293 | */ | |
5024c33a TH |
294 | skb_gro_postpull_rcsum(skb, guehdr, hdrlen); |
295 | ||
296 | data = &guehdr[1]; | |
297 | ||
298 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 | 299 | __be32 flags = *(__be32 *)(data + doffset); |
5024c33a | 300 | |
a8d31c12 TH |
301 | doffset += GUE_LEN_PRIV; |
302 | ||
303 | if (flags & GUE_PFLAG_REMCSUM) { | |
304 | guehdr = gue_gro_remcsum(skb, off, guehdr, | |
305 | data + doffset, hdrlen, | |
fe881ef1 TH |
306 | guehdr->proto_ctype, &grc, |
307 | !!(fou->flags & | |
308 | FOU_F_REMCSUM_NOPARTIAL)); | |
a8d31c12 TH |
309 | if (!guehdr) |
310 | goto out; | |
311 | ||
312 | data = &guehdr[1]; | |
313 | ||
314 | doffset += GUE_PLEN_REMCSUM; | |
315 | } | |
37dd0247 TH |
316 | } |
317 | ||
a8d31c12 TH |
318 | skb_gro_pull(skb, hdrlen); |
319 | ||
37dd0247 TH |
320 | flush = 0; |
321 | ||
322 | for (p = *head; p; p = p->next) { | |
323 | const struct guehdr *guehdr2; | |
324 | ||
325 | if (!NAPI_GRO_CB(p)->same_flow) | |
326 | continue; | |
327 | ||
328 | guehdr2 = (struct guehdr *)(p->data + off); | |
329 | ||
330 | /* Compare base GUE header to be equal (covers | |
5024c33a | 331 | * hlen, version, proto_ctype, and flags. |
37dd0247 TH |
332 | */ |
333 | if (guehdr->word != guehdr2->word) { | |
334 | NAPI_GRO_CB(p)->same_flow = 0; | |
335 | continue; | |
336 | } | |
337 | ||
338 | /* Compare optional fields are the same. */ | |
339 | if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1], | |
340 | guehdr->hlen << 2)) { | |
341 | NAPI_GRO_CB(p)->same_flow = 0; | |
342 | continue; | |
343 | } | |
344 | } | |
345 | ||
5024c33a TH |
346 | rcu_read_lock(); |
347 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
348 | ops = rcu_dereference(offloads[guehdr->proto_ctype]); | |
349 | if (WARN_ON(!ops || !ops->callbacks.gro_receive)) | |
350 | goto out_unlock; | |
37dd0247 TH |
351 | |
352 | pp = ops->callbacks.gro_receive(head, skb); | |
353 | ||
354 | out_unlock: | |
355 | rcu_read_unlock(); | |
356 | out: | |
357 | NAPI_GRO_CB(skb)->flush |= flush; | |
26c4f7da | 358 | skb_gro_remcsum_cleanup(skb, &grc); |
37dd0247 TH |
359 | |
360 | return pp; | |
361 | } | |
362 | ||
a2b12f3c TH |
363 | static int gue_gro_complete(struct sk_buff *skb, int nhoff, |
364 | struct udp_offload *uoff) | |
37dd0247 TH |
365 | { |
366 | const struct net_offload **offloads; | |
367 | struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff); | |
368 | const struct net_offload *ops; | |
369 | unsigned int guehlen; | |
370 | u8 proto; | |
371 | int err = -ENOENT; | |
372 | ||
5024c33a | 373 | proto = guehdr->proto_ctype; |
37dd0247 TH |
374 | |
375 | guehlen = sizeof(*guehdr) + (guehdr->hlen << 2); | |
376 | ||
377 | rcu_read_lock(); | |
378 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
379 | ops = rcu_dereference(offloads[proto]); | |
380 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
381 | goto out_unlock; | |
382 | ||
383 | err = ops->callbacks.gro_complete(skb, nhoff + guehlen); | |
384 | ||
385 | out_unlock: | |
386 | rcu_read_unlock(); | |
387 | return err; | |
388 | } | |
389 | ||
23461551 TH |
390 | static int fou_add_to_port_list(struct fou *fou) |
391 | { | |
392 | struct fou *fout; | |
393 | ||
394 | spin_lock(&fou_lock); | |
395 | list_for_each_entry(fout, &fou_list, list) { | |
396 | if (fou->port == fout->port) { | |
397 | spin_unlock(&fou_lock); | |
398 | return -EALREADY; | |
399 | } | |
400 | } | |
401 | ||
402 | list_add(&fou->list, &fou_list); | |
403 | spin_unlock(&fou_lock); | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
408 | static void fou_release(struct fou *fou) | |
409 | { | |
410 | struct socket *sock = fou->sock; | |
411 | struct sock *sk = sock->sk; | |
412 | ||
413 | udp_del_offload(&fou->udp_offloads); | |
414 | ||
415 | list_del(&fou->list); | |
416 | ||
417 | /* Remove hooks into tunnel socket */ | |
418 | sk->sk_user_data = NULL; | |
419 | ||
420 | sock_release(sock); | |
421 | ||
422 | kfree(fou); | |
423 | } | |
424 | ||
37dd0247 TH |
425 | static int fou_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) |
426 | { | |
427 | udp_sk(sk)->encap_rcv = fou_udp_recv; | |
428 | fou->protocol = cfg->protocol; | |
429 | fou->udp_offloads.callbacks.gro_receive = fou_gro_receive; | |
430 | fou->udp_offloads.callbacks.gro_complete = fou_gro_complete; | |
431 | fou->udp_offloads.port = cfg->udp_config.local_udp_port; | |
432 | fou->udp_offloads.ipproto = cfg->protocol; | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | static int gue_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) | |
438 | { | |
439 | udp_sk(sk)->encap_rcv = gue_udp_recv; | |
440 | fou->udp_offloads.callbacks.gro_receive = gue_gro_receive; | |
441 | fou->udp_offloads.callbacks.gro_complete = gue_gro_complete; | |
442 | fou->udp_offloads.port = cfg->udp_config.local_udp_port; | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
23461551 TH |
447 | static int fou_create(struct net *net, struct fou_cfg *cfg, |
448 | struct socket **sockp) | |
449 | { | |
450 | struct fou *fou = NULL; | |
451 | int err; | |
452 | struct socket *sock = NULL; | |
453 | struct sock *sk; | |
454 | ||
455 | /* Open UDP socket */ | |
456 | err = udp_sock_create(net, &cfg->udp_config, &sock); | |
457 | if (err < 0) | |
458 | goto error; | |
459 | ||
460 | /* Allocate FOU port structure */ | |
461 | fou = kzalloc(sizeof(*fou), GFP_KERNEL); | |
462 | if (!fou) { | |
463 | err = -ENOMEM; | |
464 | goto error; | |
465 | } | |
466 | ||
467 | sk = sock->sk; | |
468 | ||
fe881ef1 | 469 | fou->flags = cfg->flags; |
37dd0247 TH |
470 | fou->port = cfg->udp_config.local_udp_port; |
471 | ||
472 | /* Initial for fou type */ | |
473 | switch (cfg->type) { | |
474 | case FOU_ENCAP_DIRECT: | |
475 | err = fou_encap_init(sk, fou, cfg); | |
476 | if (err) | |
477 | goto error; | |
478 | break; | |
479 | case FOU_ENCAP_GUE: | |
480 | err = gue_encap_init(sk, fou, cfg); | |
481 | if (err) | |
482 | goto error; | |
483 | break; | |
484 | default: | |
485 | err = -EINVAL; | |
486 | goto error; | |
487 | } | |
23461551 TH |
488 | |
489 | udp_sk(sk)->encap_type = 1; | |
490 | udp_encap_enable(); | |
491 | ||
492 | sk->sk_user_data = fou; | |
493 | fou->sock = sock; | |
494 | ||
224d019c | 495 | inet_inc_convert_csum(sk); |
23461551 TH |
496 | |
497 | sk->sk_allocation = GFP_ATOMIC; | |
498 | ||
afe93325 TH |
499 | if (cfg->udp_config.family == AF_INET) { |
500 | err = udp_add_offload(&fou->udp_offloads); | |
501 | if (err) | |
502 | goto error; | |
503 | } | |
504 | ||
23461551 TH |
505 | err = fou_add_to_port_list(fou); |
506 | if (err) | |
507 | goto error; | |
508 | ||
509 | if (sockp) | |
510 | *sockp = sock; | |
511 | ||
512 | return 0; | |
513 | ||
514 | error: | |
515 | kfree(fou); | |
516 | if (sock) | |
517 | sock_release(sock); | |
518 | ||
519 | return err; | |
520 | } | |
521 | ||
522 | static int fou_destroy(struct net *net, struct fou_cfg *cfg) | |
523 | { | |
524 | struct fou *fou; | |
525 | u16 port = cfg->udp_config.local_udp_port; | |
526 | int err = -EINVAL; | |
527 | ||
528 | spin_lock(&fou_lock); | |
529 | list_for_each_entry(fou, &fou_list, list) { | |
530 | if (fou->port == port) { | |
afe93325 | 531 | udp_del_offload(&fou->udp_offloads); |
23461551 TH |
532 | fou_release(fou); |
533 | err = 0; | |
534 | break; | |
535 | } | |
536 | } | |
537 | spin_unlock(&fou_lock); | |
538 | ||
539 | return err; | |
540 | } | |
541 | ||
542 | static struct genl_family fou_nl_family = { | |
543 | .id = GENL_ID_GENERATE, | |
544 | .hdrsize = 0, | |
545 | .name = FOU_GENL_NAME, | |
546 | .version = FOU_GENL_VERSION, | |
547 | .maxattr = FOU_ATTR_MAX, | |
548 | .netnsok = true, | |
549 | }; | |
550 | ||
551 | static struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = { | |
552 | [FOU_ATTR_PORT] = { .type = NLA_U16, }, | |
553 | [FOU_ATTR_AF] = { .type = NLA_U8, }, | |
554 | [FOU_ATTR_IPPROTO] = { .type = NLA_U8, }, | |
37dd0247 | 555 | [FOU_ATTR_TYPE] = { .type = NLA_U8, }, |
fe881ef1 | 556 | [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, }, |
23461551 TH |
557 | }; |
558 | ||
559 | static int parse_nl_config(struct genl_info *info, | |
560 | struct fou_cfg *cfg) | |
561 | { | |
562 | memset(cfg, 0, sizeof(*cfg)); | |
563 | ||
564 | cfg->udp_config.family = AF_INET; | |
565 | ||
566 | if (info->attrs[FOU_ATTR_AF]) { | |
567 | u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]); | |
568 | ||
569 | if (family != AF_INET && family != AF_INET6) | |
570 | return -EINVAL; | |
571 | ||
572 | cfg->udp_config.family = family; | |
573 | } | |
574 | ||
575 | if (info->attrs[FOU_ATTR_PORT]) { | |
576 | u16 port = nla_get_u16(info->attrs[FOU_ATTR_PORT]); | |
577 | ||
578 | cfg->udp_config.local_udp_port = port; | |
579 | } | |
580 | ||
581 | if (info->attrs[FOU_ATTR_IPPROTO]) | |
582 | cfg->protocol = nla_get_u8(info->attrs[FOU_ATTR_IPPROTO]); | |
583 | ||
37dd0247 TH |
584 | if (info->attrs[FOU_ATTR_TYPE]) |
585 | cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]); | |
586 | ||
fe881ef1 TH |
587 | if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL]) |
588 | cfg->flags |= FOU_F_REMCSUM_NOPARTIAL; | |
589 | ||
23461551 TH |
590 | return 0; |
591 | } | |
592 | ||
593 | static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info) | |
594 | { | |
595 | struct fou_cfg cfg; | |
596 | int err; | |
597 | ||
598 | err = parse_nl_config(info, &cfg); | |
599 | if (err) | |
600 | return err; | |
601 | ||
602 | return fou_create(&init_net, &cfg, NULL); | |
603 | } | |
604 | ||
605 | static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info) | |
606 | { | |
607 | struct fou_cfg cfg; | |
608 | ||
609 | parse_nl_config(info, &cfg); | |
610 | ||
611 | return fou_destroy(&init_net, &cfg); | |
612 | } | |
613 | ||
614 | static const struct genl_ops fou_nl_ops[] = { | |
615 | { | |
616 | .cmd = FOU_CMD_ADD, | |
617 | .doit = fou_nl_cmd_add_port, | |
618 | .policy = fou_nl_policy, | |
619 | .flags = GENL_ADMIN_PERM, | |
620 | }, | |
621 | { | |
622 | .cmd = FOU_CMD_DEL, | |
623 | .doit = fou_nl_cmd_rm_port, | |
624 | .policy = fou_nl_policy, | |
625 | .flags = GENL_ADMIN_PERM, | |
626 | }, | |
627 | }; | |
628 | ||
a8c5f90f TH |
629 | size_t fou_encap_hlen(struct ip_tunnel_encap *e) |
630 | { | |
631 | return sizeof(struct udphdr); | |
632 | } | |
633 | EXPORT_SYMBOL(fou_encap_hlen); | |
634 | ||
635 | size_t gue_encap_hlen(struct ip_tunnel_encap *e) | |
636 | { | |
637 | size_t len; | |
638 | bool need_priv = false; | |
639 | ||
640 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
641 | ||
642 | if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) { | |
643 | len += GUE_PLEN_REMCSUM; | |
644 | need_priv = true; | |
645 | } | |
646 | ||
647 | len += need_priv ? GUE_LEN_PRIV : 0; | |
648 | ||
649 | return len; | |
650 | } | |
651 | EXPORT_SYMBOL(gue_encap_hlen); | |
652 | ||
63487bab TH |
653 | static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e, |
654 | struct flowi4 *fl4, u8 *protocol, __be16 sport) | |
655 | { | |
656 | struct udphdr *uh; | |
657 | ||
658 | skb_push(skb, sizeof(struct udphdr)); | |
659 | skb_reset_transport_header(skb); | |
660 | ||
661 | uh = udp_hdr(skb); | |
662 | ||
663 | uh->dest = e->dport; | |
664 | uh->source = sport; | |
665 | uh->len = htons(skb->len); | |
666 | uh->check = 0; | |
667 | udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb, | |
668 | fl4->saddr, fl4->daddr, skb->len); | |
669 | ||
670 | *protocol = IPPROTO_UDP; | |
671 | } | |
672 | ||
673 | int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
674 | u8 *protocol, struct flowi4 *fl4) | |
675 | { | |
676 | bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM); | |
677 | int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; | |
678 | __be16 sport; | |
679 | ||
680 | skb = iptunnel_handle_offloads(skb, csum, type); | |
681 | ||
682 | if (IS_ERR(skb)) | |
683 | return PTR_ERR(skb); | |
684 | ||
685 | sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
686 | skb, 0, 0, false); | |
687 | fou_build_udp(skb, e, fl4, protocol, sport); | |
688 | ||
689 | return 0; | |
690 | } | |
691 | EXPORT_SYMBOL(fou_build_header); | |
692 | ||
693 | int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
694 | u8 *protocol, struct flowi4 *fl4) | |
695 | { | |
696 | bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM); | |
697 | int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; | |
698 | struct guehdr *guehdr; | |
b17f709a | 699 | size_t hdrlen, optlen = 0; |
63487bab | 700 | __be16 sport; |
5024c33a TH |
701 | void *data; |
702 | bool need_priv = false; | |
703 | ||
b17f709a TH |
704 | if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) && |
705 | skb->ip_summed == CHECKSUM_PARTIAL) { | |
706 | csum = false; | |
707 | optlen += GUE_PLEN_REMCSUM; | |
708 | type |= SKB_GSO_TUNNEL_REMCSUM; | |
709 | need_priv = true; | |
710 | } | |
711 | ||
5024c33a | 712 | optlen += need_priv ? GUE_LEN_PRIV : 0; |
63487bab TH |
713 | |
714 | skb = iptunnel_handle_offloads(skb, csum, type); | |
715 | ||
716 | if (IS_ERR(skb)) | |
717 | return PTR_ERR(skb); | |
718 | ||
719 | /* Get source port (based on flow hash) before skb_push */ | |
720 | sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
721 | skb, 0, 0, false); | |
722 | ||
b17f709a TH |
723 | hdrlen = sizeof(struct guehdr) + optlen; |
724 | ||
725 | skb_push(skb, hdrlen); | |
63487bab TH |
726 | |
727 | guehdr = (struct guehdr *)skb->data; | |
728 | ||
5024c33a | 729 | guehdr->control = 0; |
63487bab | 730 | guehdr->version = 0; |
5024c33a | 731 | guehdr->hlen = optlen >> 2; |
63487bab | 732 | guehdr->flags = 0; |
5024c33a TH |
733 | guehdr->proto_ctype = *protocol; |
734 | ||
735 | data = &guehdr[1]; | |
736 | ||
737 | if (need_priv) { | |
738 | __be32 *flags = data; | |
739 | ||
740 | guehdr->flags |= GUE_FLAG_PRIV; | |
741 | *flags = 0; | |
742 | data += GUE_LEN_PRIV; | |
743 | ||
b17f709a TH |
744 | if (type & SKB_GSO_TUNNEL_REMCSUM) { |
745 | u16 csum_start = skb_checksum_start_offset(skb); | |
746 | __be16 *pd = data; | |
747 | ||
748 | if (csum_start < hdrlen) | |
749 | return -EINVAL; | |
750 | ||
751 | csum_start -= hdrlen; | |
752 | pd[0] = htons(csum_start); | |
753 | pd[1] = htons(csum_start + skb->csum_offset); | |
754 | ||
755 | if (!skb_is_gso(skb)) { | |
756 | skb->ip_summed = CHECKSUM_NONE; | |
757 | skb->encapsulation = 0; | |
758 | } | |
759 | ||
760 | *flags |= GUE_PFLAG_REMCSUM; | |
761 | data += GUE_PLEN_REMCSUM; | |
762 | } | |
763 | ||
5024c33a | 764 | } |
63487bab TH |
765 | |
766 | fou_build_udp(skb, e, fl4, protocol, sport); | |
767 | ||
768 | return 0; | |
769 | } | |
770 | EXPORT_SYMBOL(gue_build_header); | |
771 | ||
a8c5f90f TH |
772 | #ifdef CONFIG_NET_FOU_IP_TUNNELS |
773 | ||
774 | static const struct ip_tunnel_encap_ops __read_mostly fou_iptun_ops = { | |
775 | .encap_hlen = fou_encap_hlen, | |
776 | .build_header = fou_build_header, | |
777 | }; | |
778 | ||
779 | static const struct ip_tunnel_encap_ops __read_mostly gue_iptun_ops = { | |
780 | .encap_hlen = gue_encap_hlen, | |
781 | .build_header = gue_build_header, | |
782 | }; | |
783 | ||
784 | static int ip_tunnel_encap_add_fou_ops(void) | |
785 | { | |
786 | int ret; | |
787 | ||
788 | ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
789 | if (ret < 0) { | |
790 | pr_err("can't add fou ops\n"); | |
791 | return ret; | |
792 | } | |
793 | ||
794 | ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
795 | if (ret < 0) { | |
796 | pr_err("can't add gue ops\n"); | |
797 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
798 | return ret; | |
799 | } | |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
804 | static void ip_tunnel_encap_del_fou_ops(void) | |
805 | { | |
806 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
807 | ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
808 | } | |
809 | ||
810 | #else | |
811 | ||
812 | static int ip_tunnel_encap_add_fou_ops(void) | |
813 | { | |
814 | return 0; | |
815 | } | |
816 | ||
882288c0 | 817 | static void ip_tunnel_encap_del_fou_ops(void) |
a8c5f90f TH |
818 | { |
819 | } | |
820 | ||
821 | #endif | |
822 | ||
23461551 TH |
823 | static int __init fou_init(void) |
824 | { | |
825 | int ret; | |
826 | ||
827 | ret = genl_register_family_with_ops(&fou_nl_family, | |
828 | fou_nl_ops); | |
829 | ||
a8c5f90f TH |
830 | if (ret < 0) |
831 | goto exit; | |
832 | ||
833 | ret = ip_tunnel_encap_add_fou_ops(); | |
834 | if (ret < 0) | |
835 | genl_unregister_family(&fou_nl_family); | |
836 | ||
837 | exit: | |
23461551 TH |
838 | return ret; |
839 | } | |
840 | ||
841 | static void __exit fou_fini(void) | |
842 | { | |
843 | struct fou *fou, *next; | |
844 | ||
a8c5f90f TH |
845 | ip_tunnel_encap_del_fou_ops(); |
846 | ||
23461551 TH |
847 | genl_unregister_family(&fou_nl_family); |
848 | ||
849 | /* Close all the FOU sockets */ | |
850 | ||
851 | spin_lock(&fou_lock); | |
852 | list_for_each_entry_safe(fou, next, &fou_list, list) | |
853 | fou_release(fou); | |
854 | spin_unlock(&fou_lock); | |
855 | } | |
856 | ||
857 | module_init(fou_init); | |
858 | module_exit(fou_fini); | |
859 | MODULE_AUTHOR("Tom Herbert <therbert@google.com>"); | |
860 | MODULE_LICENSE("GPL"); |