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 | ||
23461551 TH |
19 | struct fou { |
20 | struct socket *sock; | |
21 | u8 protocol; | |
fe881ef1 | 22 | u8 flags; |
4cbcdf2b | 23 | __be16 port; |
7a6c8c34 | 24 | u16 type; |
afe93325 | 25 | struct udp_offload udp_offloads; |
23461551 TH |
26 | struct list_head list; |
27 | }; | |
28 | ||
fe881ef1 TH |
29 | #define FOU_F_REMCSUM_NOPARTIAL BIT(0) |
30 | ||
23461551 | 31 | struct fou_cfg { |
37dd0247 | 32 | u16 type; |
23461551 | 33 | u8 protocol; |
fe881ef1 | 34 | u8 flags; |
23461551 TH |
35 | struct udp_port_cfg udp_config; |
36 | }; | |
37 | ||
02d793c5 WC |
38 | static unsigned int fou_net_id; |
39 | ||
40 | struct fou_net { | |
41 | struct list_head fou_list; | |
42 | struct mutex fou_lock; | |
43 | }; | |
44 | ||
23461551 TH |
45 | static inline struct fou *fou_from_sock(struct sock *sk) |
46 | { | |
47 | return sk->sk_user_data; | |
48 | } | |
49 | ||
5024c33a | 50 | static void fou_recv_pull(struct sk_buff *skb, size_t len) |
23461551 TH |
51 | { |
52 | struct iphdr *iph = ip_hdr(skb); | |
53 | ||
54 | /* Remove 'len' bytes from the packet (UDP header and | |
5024c33a | 55 | * FOU header if present). |
23461551 TH |
56 | */ |
57 | iph->tot_len = htons(ntohs(iph->tot_len) - len); | |
58 | __skb_pull(skb, len); | |
59 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
60 | skb_reset_transport_header(skb); | |
23461551 TH |
61 | } |
62 | ||
63 | static int fou_udp_recv(struct sock *sk, struct sk_buff *skb) | |
64 | { | |
65 | struct fou *fou = fou_from_sock(sk); | |
66 | ||
67 | if (!fou) | |
68 | return 1; | |
69 | ||
5024c33a TH |
70 | fou_recv_pull(skb, sizeof(struct udphdr)); |
71 | ||
72 | return -fou->protocol; | |
73 | } | |
74 | ||
a8d31c12 | 75 | static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr, |
fe881ef1 TH |
76 | void *data, size_t hdrlen, u8 ipproto, |
77 | bool nopartial) | |
a8d31c12 TH |
78 | { |
79 | __be16 *pd = data; | |
4fd671de TH |
80 | size_t start = ntohs(pd[0]); |
81 | size_t offset = ntohs(pd[1]); | |
b7fe10e5 TH |
82 | size_t plen = sizeof(struct udphdr) + hdrlen + |
83 | max_t(size_t, offset + sizeof(u16), start); | |
84 | ||
85 | if (skb->remcsum_offload) | |
86 | return guehdr; | |
a8d31c12 | 87 | |
a8d31c12 TH |
88 | if (!pskb_may_pull(skb, plen)) |
89 | return NULL; | |
90 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
91 | ||
fe881ef1 TH |
92 | skb_remcsum_process(skb, (void *)guehdr + hdrlen, |
93 | start, offset, nopartial); | |
a8d31c12 TH |
94 | |
95 | return guehdr; | |
96 | } | |
97 | ||
5024c33a TH |
98 | static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr) |
99 | { | |
100 | /* No support yet */ | |
101 | kfree_skb(skb); | |
102 | return 0; | |
23461551 TH |
103 | } |
104 | ||
37dd0247 TH |
105 | static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) |
106 | { | |
107 | struct fou *fou = fou_from_sock(sk); | |
5024c33a | 108 | size_t len, optlen, hdrlen; |
37dd0247 | 109 | struct guehdr *guehdr; |
5024c33a | 110 | void *data; |
a8d31c12 | 111 | u16 doffset = 0; |
37dd0247 TH |
112 | |
113 | if (!fou) | |
114 | return 1; | |
115 | ||
116 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
117 | if (!pskb_may_pull(skb, len)) | |
118 | goto drop; | |
119 | ||
5024c33a TH |
120 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; |
121 | ||
122 | optlen = guehdr->hlen << 2; | |
123 | len += optlen; | |
37dd0247 | 124 | |
37dd0247 TH |
125 | if (!pskb_may_pull(skb, len)) |
126 | goto drop; | |
127 | ||
5024c33a TH |
128 | /* guehdr may change after pull */ |
129 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
d8f00d27 | 130 | |
5024c33a | 131 | hdrlen = sizeof(struct guehdr) + optlen; |
37dd0247 | 132 | |
5024c33a | 133 | if (guehdr->version != 0 || validate_gue_flags(guehdr, optlen)) |
37dd0247 | 134 | goto drop; |
5024c33a | 135 | |
a8d31c12 TH |
136 | hdrlen = sizeof(struct guehdr) + optlen; |
137 | ||
138 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len); | |
139 | ||
a8d31c12 TH |
140 | /* Pull csum through the guehdr now . This can be used if |
141 | * there is a remote checksum offload. | |
142 | */ | |
143 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
5024c33a TH |
144 | |
145 | data = &guehdr[1]; | |
146 | ||
147 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 TH |
148 | __be32 flags = *(__be32 *)(data + doffset); |
149 | ||
150 | doffset += GUE_LEN_PRIV; | |
151 | ||
152 | if (flags & GUE_PFLAG_REMCSUM) { | |
153 | guehdr = gue_remcsum(skb, guehdr, data + doffset, | |
fe881ef1 TH |
154 | hdrlen, guehdr->proto_ctype, |
155 | !!(fou->flags & | |
156 | FOU_F_REMCSUM_NOPARTIAL)); | |
a8d31c12 TH |
157 | if (!guehdr) |
158 | goto drop; | |
159 | ||
160 | data = &guehdr[1]; | |
5024c33a | 161 | |
a8d31c12 TH |
162 | doffset += GUE_PLEN_REMCSUM; |
163 | } | |
37dd0247 TH |
164 | } |
165 | ||
5024c33a TH |
166 | if (unlikely(guehdr->control)) |
167 | return gue_control_message(skb, guehdr); | |
168 | ||
4fd671de | 169 | __skb_pull(skb, sizeof(struct udphdr) + hdrlen); |
a8d31c12 TH |
170 | skb_reset_transport_header(skb); |
171 | ||
5024c33a TH |
172 | return -guehdr->proto_ctype; |
173 | ||
37dd0247 TH |
174 | drop: |
175 | kfree_skb(skb); | |
176 | return 0; | |
177 | } | |
178 | ||
afe93325 | 179 | static struct sk_buff **fou_gro_receive(struct sk_buff **head, |
a2b12f3c TH |
180 | struct sk_buff *skb, |
181 | struct udp_offload *uoff) | |
afe93325 TH |
182 | { |
183 | const struct net_offload *ops; | |
184 | struct sk_buff **pp = NULL; | |
185 | u8 proto = NAPI_GRO_CB(skb)->proto; | |
efc98d08 | 186 | const struct net_offload **offloads; |
afe93325 TH |
187 | |
188 | rcu_read_lock(); | |
efc98d08 | 189 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
190 | ops = rcu_dereference(offloads[proto]); |
191 | if (!ops || !ops->callbacks.gro_receive) | |
192 | goto out_unlock; | |
193 | ||
194 | pp = ops->callbacks.gro_receive(head, skb); | |
195 | ||
196 | out_unlock: | |
197 | rcu_read_unlock(); | |
198 | ||
199 | return pp; | |
200 | } | |
201 | ||
a2b12f3c TH |
202 | static int fou_gro_complete(struct sk_buff *skb, int nhoff, |
203 | struct udp_offload *uoff) | |
afe93325 TH |
204 | { |
205 | const struct net_offload *ops; | |
206 | u8 proto = NAPI_GRO_CB(skb)->proto; | |
207 | int err = -ENOSYS; | |
efc98d08 | 208 | const struct net_offload **offloads; |
afe93325 | 209 | |
cfdf1e1b JG |
210 | udp_tunnel_gro_complete(skb, nhoff); |
211 | ||
afe93325 | 212 | rcu_read_lock(); |
efc98d08 | 213 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
214 | ops = rcu_dereference(offloads[proto]); |
215 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
216 | goto out_unlock; | |
217 | ||
218 | err = ops->callbacks.gro_complete(skb, nhoff); | |
219 | ||
220 | out_unlock: | |
221 | rcu_read_unlock(); | |
222 | ||
223 | return err; | |
224 | } | |
225 | ||
a8d31c12 TH |
226 | static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, |
227 | struct guehdr *guehdr, void *data, | |
b7fe10e5 TH |
228 | size_t hdrlen, struct gro_remcsum *grc, |
229 | bool nopartial) | |
a8d31c12 TH |
230 | { |
231 | __be16 *pd = data; | |
4fd671de TH |
232 | size_t start = ntohs(pd[0]); |
233 | size_t offset = ntohs(pd[1]); | |
a8d31c12 TH |
234 | |
235 | if (skb->remcsum_offload) | |
b7fe10e5 | 236 | return guehdr; |
a8d31c12 | 237 | |
4fd671de | 238 | if (!NAPI_GRO_CB(skb)->csum_valid) |
a8d31c12 TH |
239 | return NULL; |
240 | ||
b7fe10e5 TH |
241 | guehdr = skb_gro_remcsum_process(skb, (void *)guehdr, off, hdrlen, |
242 | start, offset, grc, nopartial); | |
a8d31c12 TH |
243 | |
244 | skb->remcsum_offload = 1; | |
245 | ||
246 | return guehdr; | |
247 | } | |
248 | ||
37dd0247 | 249 | static struct sk_buff **gue_gro_receive(struct sk_buff **head, |
a2b12f3c TH |
250 | struct sk_buff *skb, |
251 | struct udp_offload *uoff) | |
37dd0247 TH |
252 | { |
253 | const struct net_offload **offloads; | |
254 | const struct net_offload *ops; | |
255 | struct sk_buff **pp = NULL; | |
256 | struct sk_buff *p; | |
37dd0247 | 257 | struct guehdr *guehdr; |
5024c33a TH |
258 | size_t len, optlen, hdrlen, off; |
259 | void *data; | |
a8d31c12 | 260 | u16 doffset = 0; |
37dd0247 | 261 | int flush = 1; |
fe881ef1 | 262 | struct fou *fou = container_of(uoff, struct fou, udp_offloads); |
26c4f7da TH |
263 | struct gro_remcsum grc; |
264 | ||
265 | skb_gro_remcsum_init(&grc); | |
37dd0247 TH |
266 | |
267 | off = skb_gro_offset(skb); | |
5024c33a TH |
268 | len = off + sizeof(*guehdr); |
269 | ||
37dd0247 | 270 | guehdr = skb_gro_header_fast(skb, off); |
5024c33a TH |
271 | if (skb_gro_header_hard(skb, len)) { |
272 | guehdr = skb_gro_header_slow(skb, len, off); | |
37dd0247 TH |
273 | if (unlikely(!guehdr)) |
274 | goto out; | |
275 | } | |
276 | ||
5024c33a TH |
277 | optlen = guehdr->hlen << 2; |
278 | len += optlen; | |
37dd0247 | 279 | |
5024c33a TH |
280 | if (skb_gro_header_hard(skb, len)) { |
281 | guehdr = skb_gro_header_slow(skb, len, off); | |
282 | if (unlikely(!guehdr)) | |
283 | goto out; | |
284 | } | |
37dd0247 | 285 | |
5024c33a TH |
286 | if (unlikely(guehdr->control) || guehdr->version != 0 || |
287 | validate_gue_flags(guehdr, optlen)) | |
288 | goto out; | |
37dd0247 | 289 | |
5024c33a TH |
290 | hdrlen = sizeof(*guehdr) + optlen; |
291 | ||
a8d31c12 TH |
292 | /* Adjust NAPI_GRO_CB(skb)->csum to account for guehdr, |
293 | * this is needed if there is a remote checkcsum offload. | |
294 | */ | |
5024c33a TH |
295 | skb_gro_postpull_rcsum(skb, guehdr, hdrlen); |
296 | ||
297 | data = &guehdr[1]; | |
298 | ||
299 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 | 300 | __be32 flags = *(__be32 *)(data + doffset); |
5024c33a | 301 | |
a8d31c12 TH |
302 | doffset += GUE_LEN_PRIV; |
303 | ||
304 | if (flags & GUE_PFLAG_REMCSUM) { | |
305 | guehdr = gue_gro_remcsum(skb, off, guehdr, | |
b7fe10e5 | 306 | data + doffset, hdrlen, &grc, |
fe881ef1 TH |
307 | !!(fou->flags & |
308 | FOU_F_REMCSUM_NOPARTIAL)); | |
b7fe10e5 | 309 | |
a8d31c12 TH |
310 | if (!guehdr) |
311 | goto out; | |
312 | ||
313 | data = &guehdr[1]; | |
314 | ||
315 | doffset += GUE_PLEN_REMCSUM; | |
316 | } | |
37dd0247 TH |
317 | } |
318 | ||
a8d31c12 TH |
319 | skb_gro_pull(skb, hdrlen); |
320 | ||
37dd0247 TH |
321 | flush = 0; |
322 | ||
323 | for (p = *head; p; p = p->next) { | |
324 | const struct guehdr *guehdr2; | |
325 | ||
326 | if (!NAPI_GRO_CB(p)->same_flow) | |
327 | continue; | |
328 | ||
329 | guehdr2 = (struct guehdr *)(p->data + off); | |
330 | ||
331 | /* Compare base GUE header to be equal (covers | |
5024c33a | 332 | * hlen, version, proto_ctype, and flags. |
37dd0247 TH |
333 | */ |
334 | if (guehdr->word != guehdr2->word) { | |
335 | NAPI_GRO_CB(p)->same_flow = 0; | |
336 | continue; | |
337 | } | |
338 | ||
339 | /* Compare optional fields are the same. */ | |
340 | if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1], | |
341 | guehdr->hlen << 2)) { | |
342 | NAPI_GRO_CB(p)->same_flow = 0; | |
343 | continue; | |
344 | } | |
345 | } | |
346 | ||
5024c33a TH |
347 | rcu_read_lock(); |
348 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
349 | ops = rcu_dereference(offloads[guehdr->proto_ctype]); | |
350 | if (WARN_ON(!ops || !ops->callbacks.gro_receive)) | |
351 | goto out_unlock; | |
37dd0247 TH |
352 | |
353 | pp = ops->callbacks.gro_receive(head, skb); | |
354 | ||
355 | out_unlock: | |
356 | rcu_read_unlock(); | |
357 | out: | |
358 | NAPI_GRO_CB(skb)->flush |= flush; | |
26c4f7da | 359 | skb_gro_remcsum_cleanup(skb, &grc); |
37dd0247 TH |
360 | |
361 | return pp; | |
362 | } | |
363 | ||
a2b12f3c TH |
364 | static int gue_gro_complete(struct sk_buff *skb, int nhoff, |
365 | struct udp_offload *uoff) | |
37dd0247 TH |
366 | { |
367 | const struct net_offload **offloads; | |
368 | struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff); | |
369 | const struct net_offload *ops; | |
370 | unsigned int guehlen; | |
371 | u8 proto; | |
372 | int err = -ENOENT; | |
373 | ||
5024c33a | 374 | proto = guehdr->proto_ctype; |
37dd0247 TH |
375 | |
376 | guehlen = sizeof(*guehdr) + (guehdr->hlen << 2); | |
377 | ||
378 | rcu_read_lock(); | |
379 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
380 | ops = rcu_dereference(offloads[proto]); | |
381 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
382 | goto out_unlock; | |
383 | ||
384 | err = ops->callbacks.gro_complete(skb, nhoff + guehlen); | |
385 | ||
386 | out_unlock: | |
387 | rcu_read_unlock(); | |
388 | return err; | |
389 | } | |
390 | ||
02d793c5 | 391 | static int fou_add_to_port_list(struct net *net, struct fou *fou) |
23461551 | 392 | { |
02d793c5 | 393 | struct fou_net *fn = net_generic(net, fou_net_id); |
23461551 TH |
394 | struct fou *fout; |
395 | ||
02d793c5 WC |
396 | mutex_lock(&fn->fou_lock); |
397 | list_for_each_entry(fout, &fn->fou_list, list) { | |
23461551 | 398 | if (fou->port == fout->port) { |
02d793c5 | 399 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
400 | return -EALREADY; |
401 | } | |
402 | } | |
403 | ||
02d793c5 WC |
404 | list_add(&fou->list, &fn->fou_list); |
405 | mutex_unlock(&fn->fou_lock); | |
23461551 TH |
406 | |
407 | return 0; | |
408 | } | |
409 | ||
410 | static void fou_release(struct fou *fou) | |
411 | { | |
412 | struct socket *sock = fou->sock; | |
413 | struct sock *sk = sock->sk; | |
414 | ||
9272f048 WC |
415 | if (sk->sk_family == AF_INET) |
416 | udp_del_offload(&fou->udp_offloads); | |
23461551 | 417 | list_del(&fou->list); |
02d793c5 | 418 | udp_tunnel_sock_release(sock); |
23461551 TH |
419 | |
420 | kfree(fou); | |
421 | } | |
422 | ||
37dd0247 TH |
423 | static int fou_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) |
424 | { | |
425 | udp_sk(sk)->encap_rcv = fou_udp_recv; | |
426 | fou->protocol = cfg->protocol; | |
427 | fou->udp_offloads.callbacks.gro_receive = fou_gro_receive; | |
428 | fou->udp_offloads.callbacks.gro_complete = fou_gro_complete; | |
429 | fou->udp_offloads.port = cfg->udp_config.local_udp_port; | |
430 | fou->udp_offloads.ipproto = cfg->protocol; | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
435 | static int gue_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) | |
436 | { | |
437 | udp_sk(sk)->encap_rcv = gue_udp_recv; | |
438 | fou->udp_offloads.callbacks.gro_receive = gue_gro_receive; | |
439 | fou->udp_offloads.callbacks.gro_complete = gue_gro_complete; | |
440 | fou->udp_offloads.port = cfg->udp_config.local_udp_port; | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
23461551 TH |
445 | static int fou_create(struct net *net, struct fou_cfg *cfg, |
446 | struct socket **sockp) | |
447 | { | |
23461551 | 448 | struct socket *sock = NULL; |
02d793c5 | 449 | struct fou *fou = NULL; |
23461551 | 450 | struct sock *sk; |
02d793c5 | 451 | int err; |
23461551 TH |
452 | |
453 | /* Open UDP socket */ | |
454 | err = udp_sock_create(net, &cfg->udp_config, &sock); | |
455 | if (err < 0) | |
456 | goto error; | |
457 | ||
458 | /* Allocate FOU port structure */ | |
459 | fou = kzalloc(sizeof(*fou), GFP_KERNEL); | |
460 | if (!fou) { | |
461 | err = -ENOMEM; | |
462 | goto error; | |
463 | } | |
464 | ||
465 | sk = sock->sk; | |
466 | ||
fe881ef1 | 467 | fou->flags = cfg->flags; |
37dd0247 TH |
468 | fou->port = cfg->udp_config.local_udp_port; |
469 | ||
470 | /* Initial for fou type */ | |
471 | switch (cfg->type) { | |
472 | case FOU_ENCAP_DIRECT: | |
473 | err = fou_encap_init(sk, fou, cfg); | |
474 | if (err) | |
475 | goto error; | |
476 | break; | |
477 | case FOU_ENCAP_GUE: | |
478 | err = gue_encap_init(sk, fou, cfg); | |
479 | if (err) | |
480 | goto error; | |
481 | break; | |
482 | default: | |
483 | err = -EINVAL; | |
484 | goto error; | |
485 | } | |
23461551 | 486 | |
7a6c8c34 WC |
487 | fou->type = cfg->type; |
488 | ||
23461551 TH |
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 | ||
02d793c5 | 505 | err = fou_add_to_port_list(net, fou); |
23461551 TH |
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) | |
02d793c5 | 517 | udp_tunnel_sock_release(sock); |
23461551 TH |
518 | |
519 | return err; | |
520 | } | |
521 | ||
522 | static int fou_destroy(struct net *net, struct fou_cfg *cfg) | |
523 | { | |
02d793c5 | 524 | struct fou_net *fn = net_generic(net, fou_net_id); |
4cbcdf2b | 525 | __be16 port = cfg->udp_config.local_udp_port; |
23461551 | 526 | int err = -EINVAL; |
02d793c5 | 527 | struct fou *fou; |
23461551 | 528 | |
02d793c5 WC |
529 | mutex_lock(&fn->fou_lock); |
530 | list_for_each_entry(fou, &fn->fou_list, list) { | |
23461551 TH |
531 | if (fou->port == port) { |
532 | fou_release(fou); | |
533 | err = 0; | |
534 | break; | |
535 | } | |
536 | } | |
02d793c5 | 537 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
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]) { | |
4cbcdf2b | 576 | __be16 port = nla_get_be16(info->attrs[FOU_ATTR_PORT]); |
23461551 TH |
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 | { | |
02d793c5 | 595 | struct net *net = genl_info_net(info); |
23461551 TH |
596 | struct fou_cfg cfg; |
597 | int err; | |
598 | ||
599 | err = parse_nl_config(info, &cfg); | |
600 | if (err) | |
601 | return err; | |
602 | ||
02d793c5 | 603 | return fou_create(net, &cfg, NULL); |
23461551 TH |
604 | } |
605 | ||
606 | static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info) | |
607 | { | |
02d793c5 | 608 | struct net *net = genl_info_net(info); |
23461551 | 609 | struct fou_cfg cfg; |
67270636 | 610 | int err; |
23461551 | 611 | |
67270636 WC |
612 | err = parse_nl_config(info, &cfg); |
613 | if (err) | |
614 | return err; | |
23461551 | 615 | |
02d793c5 | 616 | return fou_destroy(net, &cfg); |
23461551 TH |
617 | } |
618 | ||
7a6c8c34 WC |
619 | static int fou_fill_info(struct fou *fou, struct sk_buff *msg) |
620 | { | |
621 | if (nla_put_u8(msg, FOU_ATTR_AF, fou->sock->sk->sk_family) || | |
622 | nla_put_be16(msg, FOU_ATTR_PORT, fou->port) || | |
623 | nla_put_u8(msg, FOU_ATTR_IPPROTO, fou->protocol) || | |
624 | nla_put_u8(msg, FOU_ATTR_TYPE, fou->type)) | |
625 | return -1; | |
626 | ||
627 | if (fou->flags & FOU_F_REMCSUM_NOPARTIAL) | |
628 | if (nla_put_flag(msg, FOU_ATTR_REMCSUM_NOPARTIAL)) | |
629 | return -1; | |
630 | return 0; | |
631 | } | |
632 | ||
633 | static int fou_dump_info(struct fou *fou, u32 portid, u32 seq, | |
634 | u32 flags, struct sk_buff *skb, u8 cmd) | |
635 | { | |
636 | void *hdr; | |
637 | ||
638 | hdr = genlmsg_put(skb, portid, seq, &fou_nl_family, flags, cmd); | |
639 | if (!hdr) | |
640 | return -ENOMEM; | |
641 | ||
642 | if (fou_fill_info(fou, skb) < 0) | |
643 | goto nla_put_failure; | |
644 | ||
645 | genlmsg_end(skb, hdr); | |
646 | return 0; | |
647 | ||
648 | nla_put_failure: | |
649 | genlmsg_cancel(skb, hdr); | |
650 | return -EMSGSIZE; | |
651 | } | |
652 | ||
653 | static int fou_nl_cmd_get_port(struct sk_buff *skb, struct genl_info *info) | |
654 | { | |
655 | struct net *net = genl_info_net(info); | |
656 | struct fou_net *fn = net_generic(net, fou_net_id); | |
657 | struct sk_buff *msg; | |
658 | struct fou_cfg cfg; | |
659 | struct fou *fout; | |
660 | __be16 port; | |
661 | int ret; | |
662 | ||
663 | ret = parse_nl_config(info, &cfg); | |
664 | if (ret) | |
665 | return ret; | |
666 | port = cfg.udp_config.local_udp_port; | |
667 | if (port == 0) | |
668 | return -EINVAL; | |
669 | ||
670 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
671 | if (!msg) | |
672 | return -ENOMEM; | |
673 | ||
674 | ret = -ESRCH; | |
675 | mutex_lock(&fn->fou_lock); | |
676 | list_for_each_entry(fout, &fn->fou_list, list) { | |
677 | if (port == fout->port) { | |
678 | ret = fou_dump_info(fout, info->snd_portid, | |
679 | info->snd_seq, 0, msg, | |
680 | info->genlhdr->cmd); | |
681 | break; | |
682 | } | |
683 | } | |
684 | mutex_unlock(&fn->fou_lock); | |
685 | if (ret < 0) | |
686 | goto out_free; | |
687 | ||
688 | return genlmsg_reply(msg, info); | |
689 | ||
690 | out_free: | |
691 | nlmsg_free(msg); | |
692 | return ret; | |
693 | } | |
694 | ||
695 | static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
696 | { | |
697 | struct net *net = sock_net(skb->sk); | |
698 | struct fou_net *fn = net_generic(net, fou_net_id); | |
699 | struct fou *fout; | |
700 | int idx = 0, ret; | |
701 | ||
702 | mutex_lock(&fn->fou_lock); | |
703 | list_for_each_entry(fout, &fn->fou_list, list) { | |
704 | if (idx++ < cb->args[0]) | |
705 | continue; | |
706 | ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid, | |
707 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
708 | skb, FOU_CMD_GET); | |
709 | if (ret) | |
540207ae | 710 | break; |
7a6c8c34 WC |
711 | } |
712 | mutex_unlock(&fn->fou_lock); | |
713 | ||
7a6c8c34 WC |
714 | cb->args[0] = idx; |
715 | return skb->len; | |
716 | } | |
717 | ||
23461551 TH |
718 | static const struct genl_ops fou_nl_ops[] = { |
719 | { | |
720 | .cmd = FOU_CMD_ADD, | |
721 | .doit = fou_nl_cmd_add_port, | |
722 | .policy = fou_nl_policy, | |
723 | .flags = GENL_ADMIN_PERM, | |
724 | }, | |
725 | { | |
726 | .cmd = FOU_CMD_DEL, | |
727 | .doit = fou_nl_cmd_rm_port, | |
728 | .policy = fou_nl_policy, | |
729 | .flags = GENL_ADMIN_PERM, | |
730 | }, | |
7a6c8c34 WC |
731 | { |
732 | .cmd = FOU_CMD_GET, | |
733 | .doit = fou_nl_cmd_get_port, | |
734 | .dumpit = fou_nl_dump, | |
735 | .policy = fou_nl_policy, | |
736 | }, | |
23461551 TH |
737 | }; |
738 | ||
a8c5f90f TH |
739 | size_t fou_encap_hlen(struct ip_tunnel_encap *e) |
740 | { | |
741 | return sizeof(struct udphdr); | |
742 | } | |
743 | EXPORT_SYMBOL(fou_encap_hlen); | |
744 | ||
745 | size_t gue_encap_hlen(struct ip_tunnel_encap *e) | |
746 | { | |
747 | size_t len; | |
748 | bool need_priv = false; | |
749 | ||
750 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
751 | ||
752 | if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) { | |
753 | len += GUE_PLEN_REMCSUM; | |
754 | need_priv = true; | |
755 | } | |
756 | ||
757 | len += need_priv ? GUE_LEN_PRIV : 0; | |
758 | ||
759 | return len; | |
760 | } | |
761 | EXPORT_SYMBOL(gue_encap_hlen); | |
762 | ||
63487bab TH |
763 | static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e, |
764 | struct flowi4 *fl4, u8 *protocol, __be16 sport) | |
765 | { | |
766 | struct udphdr *uh; | |
767 | ||
768 | skb_push(skb, sizeof(struct udphdr)); | |
769 | skb_reset_transport_header(skb); | |
770 | ||
771 | uh = udp_hdr(skb); | |
772 | ||
773 | uh->dest = e->dport; | |
774 | uh->source = sport; | |
775 | uh->len = htons(skb->len); | |
776 | uh->check = 0; | |
777 | udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb, | |
778 | fl4->saddr, fl4->daddr, skb->len); | |
779 | ||
780 | *protocol = IPPROTO_UDP; | |
781 | } | |
782 | ||
783 | int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
784 | u8 *protocol, struct flowi4 *fl4) | |
785 | { | |
786 | bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM); | |
787 | int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; | |
788 | __be16 sport; | |
789 | ||
790 | skb = iptunnel_handle_offloads(skb, csum, type); | |
791 | ||
792 | if (IS_ERR(skb)) | |
793 | return PTR_ERR(skb); | |
794 | ||
795 | sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
796 | skb, 0, 0, false); | |
797 | fou_build_udp(skb, e, fl4, protocol, sport); | |
798 | ||
799 | return 0; | |
800 | } | |
801 | EXPORT_SYMBOL(fou_build_header); | |
802 | ||
803 | int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
804 | u8 *protocol, struct flowi4 *fl4) | |
805 | { | |
806 | bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM); | |
807 | int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; | |
808 | struct guehdr *guehdr; | |
b17f709a | 809 | size_t hdrlen, optlen = 0; |
63487bab | 810 | __be16 sport; |
5024c33a TH |
811 | void *data; |
812 | bool need_priv = false; | |
813 | ||
b17f709a TH |
814 | if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) && |
815 | skb->ip_summed == CHECKSUM_PARTIAL) { | |
816 | csum = false; | |
817 | optlen += GUE_PLEN_REMCSUM; | |
818 | type |= SKB_GSO_TUNNEL_REMCSUM; | |
819 | need_priv = true; | |
820 | } | |
821 | ||
5024c33a | 822 | optlen += need_priv ? GUE_LEN_PRIV : 0; |
63487bab TH |
823 | |
824 | skb = iptunnel_handle_offloads(skb, csum, type); | |
825 | ||
826 | if (IS_ERR(skb)) | |
827 | return PTR_ERR(skb); | |
828 | ||
829 | /* Get source port (based on flow hash) before skb_push */ | |
830 | sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
831 | skb, 0, 0, false); | |
832 | ||
b17f709a TH |
833 | hdrlen = sizeof(struct guehdr) + optlen; |
834 | ||
835 | skb_push(skb, hdrlen); | |
63487bab TH |
836 | |
837 | guehdr = (struct guehdr *)skb->data; | |
838 | ||
5024c33a | 839 | guehdr->control = 0; |
63487bab | 840 | guehdr->version = 0; |
5024c33a | 841 | guehdr->hlen = optlen >> 2; |
63487bab | 842 | guehdr->flags = 0; |
5024c33a TH |
843 | guehdr->proto_ctype = *protocol; |
844 | ||
845 | data = &guehdr[1]; | |
846 | ||
847 | if (need_priv) { | |
848 | __be32 *flags = data; | |
849 | ||
850 | guehdr->flags |= GUE_FLAG_PRIV; | |
851 | *flags = 0; | |
852 | data += GUE_LEN_PRIV; | |
853 | ||
b17f709a TH |
854 | if (type & SKB_GSO_TUNNEL_REMCSUM) { |
855 | u16 csum_start = skb_checksum_start_offset(skb); | |
856 | __be16 *pd = data; | |
857 | ||
858 | if (csum_start < hdrlen) | |
859 | return -EINVAL; | |
860 | ||
861 | csum_start -= hdrlen; | |
862 | pd[0] = htons(csum_start); | |
863 | pd[1] = htons(csum_start + skb->csum_offset); | |
864 | ||
865 | if (!skb_is_gso(skb)) { | |
866 | skb->ip_summed = CHECKSUM_NONE; | |
867 | skb->encapsulation = 0; | |
868 | } | |
869 | ||
870 | *flags |= GUE_PFLAG_REMCSUM; | |
871 | data += GUE_PLEN_REMCSUM; | |
872 | } | |
873 | ||
5024c33a | 874 | } |
63487bab TH |
875 | |
876 | fou_build_udp(skb, e, fl4, protocol, sport); | |
877 | ||
878 | return 0; | |
879 | } | |
880 | EXPORT_SYMBOL(gue_build_header); | |
881 | ||
a8c5f90f TH |
882 | #ifdef CONFIG_NET_FOU_IP_TUNNELS |
883 | ||
5eeb2922 | 884 | static const struct ip_tunnel_encap_ops fou_iptun_ops = { |
a8c5f90f TH |
885 | .encap_hlen = fou_encap_hlen, |
886 | .build_header = fou_build_header, | |
887 | }; | |
888 | ||
5eeb2922 | 889 | static const struct ip_tunnel_encap_ops gue_iptun_ops = { |
a8c5f90f TH |
890 | .encap_hlen = gue_encap_hlen, |
891 | .build_header = gue_build_header, | |
892 | }; | |
893 | ||
894 | static int ip_tunnel_encap_add_fou_ops(void) | |
895 | { | |
896 | int ret; | |
897 | ||
898 | ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
899 | if (ret < 0) { | |
900 | pr_err("can't add fou ops\n"); | |
901 | return ret; | |
902 | } | |
903 | ||
904 | ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
905 | if (ret < 0) { | |
906 | pr_err("can't add gue ops\n"); | |
907 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
908 | return ret; | |
909 | } | |
910 | ||
911 | return 0; | |
912 | } | |
913 | ||
914 | static void ip_tunnel_encap_del_fou_ops(void) | |
915 | { | |
916 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
917 | ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
918 | } | |
919 | ||
920 | #else | |
921 | ||
922 | static int ip_tunnel_encap_add_fou_ops(void) | |
923 | { | |
924 | return 0; | |
925 | } | |
926 | ||
882288c0 | 927 | static void ip_tunnel_encap_del_fou_ops(void) |
a8c5f90f TH |
928 | { |
929 | } | |
930 | ||
931 | #endif | |
932 | ||
02d793c5 WC |
933 | static __net_init int fou_init_net(struct net *net) |
934 | { | |
935 | struct fou_net *fn = net_generic(net, fou_net_id); | |
936 | ||
937 | INIT_LIST_HEAD(&fn->fou_list); | |
938 | mutex_init(&fn->fou_lock); | |
939 | return 0; | |
940 | } | |
941 | ||
942 | static __net_exit void fou_exit_net(struct net *net) | |
943 | { | |
944 | struct fou_net *fn = net_generic(net, fou_net_id); | |
945 | struct fou *fou, *next; | |
946 | ||
947 | /* Close all the FOU sockets */ | |
948 | mutex_lock(&fn->fou_lock); | |
949 | list_for_each_entry_safe(fou, next, &fn->fou_list, list) | |
950 | fou_release(fou); | |
951 | mutex_unlock(&fn->fou_lock); | |
952 | } | |
953 | ||
954 | static struct pernet_operations fou_net_ops = { | |
955 | .init = fou_init_net, | |
956 | .exit = fou_exit_net, | |
957 | .id = &fou_net_id, | |
958 | .size = sizeof(struct fou_net), | |
959 | }; | |
960 | ||
23461551 TH |
961 | static int __init fou_init(void) |
962 | { | |
963 | int ret; | |
964 | ||
02d793c5 WC |
965 | ret = register_pernet_device(&fou_net_ops); |
966 | if (ret) | |
967 | goto exit; | |
968 | ||
23461551 TH |
969 | ret = genl_register_family_with_ops(&fou_nl_family, |
970 | fou_nl_ops); | |
a8c5f90f | 971 | if (ret < 0) |
02d793c5 | 972 | goto unregister; |
a8c5f90f TH |
973 | |
974 | ret = ip_tunnel_encap_add_fou_ops(); | |
02d793c5 WC |
975 | if (ret == 0) |
976 | return 0; | |
a8c5f90f | 977 | |
02d793c5 WC |
978 | genl_unregister_family(&fou_nl_family); |
979 | unregister: | |
980 | unregister_pernet_device(&fou_net_ops); | |
a8c5f90f | 981 | exit: |
23461551 TH |
982 | return ret; |
983 | } | |
984 | ||
985 | static void __exit fou_fini(void) | |
986 | { | |
a8c5f90f | 987 | ip_tunnel_encap_del_fou_ops(); |
23461551 | 988 | genl_unregister_family(&fou_nl_family); |
02d793c5 | 989 | unregister_pernet_device(&fou_net_ops); |
23461551 TH |
990 | } |
991 | ||
992 | module_init(fou_init); | |
993 | module_exit(fou_fini); | |
994 | MODULE_AUTHOR("Tom Herbert <therbert@google.com>"); | |
995 | MODULE_LICENSE("GPL"); |