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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; |
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]); | |
82 | size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start); | |
a8d31c12 | 83 | |
a8d31c12 TH |
84 | if (!pskb_may_pull(skb, plen)) |
85 | return NULL; | |
86 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
87 | ||
fe881ef1 TH |
88 | skb_remcsum_process(skb, (void *)guehdr + hdrlen, |
89 | start, offset, nopartial); | |
a8d31c12 TH |
90 | |
91 | return guehdr; | |
92 | } | |
93 | ||
5024c33a TH |
94 | static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr) |
95 | { | |
96 | /* No support yet */ | |
97 | kfree_skb(skb); | |
98 | return 0; | |
23461551 TH |
99 | } |
100 | ||
37dd0247 TH |
101 | static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) |
102 | { | |
103 | struct fou *fou = fou_from_sock(sk); | |
5024c33a | 104 | size_t len, optlen, hdrlen; |
37dd0247 | 105 | struct guehdr *guehdr; |
5024c33a | 106 | void *data; |
a8d31c12 | 107 | u16 doffset = 0; |
37dd0247 TH |
108 | |
109 | if (!fou) | |
110 | return 1; | |
111 | ||
112 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
113 | if (!pskb_may_pull(skb, len)) | |
114 | goto drop; | |
115 | ||
5024c33a TH |
116 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; |
117 | ||
118 | optlen = guehdr->hlen << 2; | |
119 | len += optlen; | |
37dd0247 | 120 | |
37dd0247 TH |
121 | if (!pskb_may_pull(skb, len)) |
122 | goto drop; | |
123 | ||
5024c33a TH |
124 | /* guehdr may change after pull */ |
125 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
d8f00d27 | 126 | |
5024c33a | 127 | hdrlen = sizeof(struct guehdr) + optlen; |
37dd0247 | 128 | |
5024c33a | 129 | if (guehdr->version != 0 || validate_gue_flags(guehdr, optlen)) |
37dd0247 | 130 | goto drop; |
5024c33a | 131 | |
a8d31c12 TH |
132 | hdrlen = sizeof(struct guehdr) + optlen; |
133 | ||
134 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len); | |
135 | ||
a8d31c12 TH |
136 | /* Pull csum through the guehdr now . This can be used if |
137 | * there is a remote checksum offload. | |
138 | */ | |
139 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
5024c33a TH |
140 | |
141 | data = &guehdr[1]; | |
142 | ||
143 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 TH |
144 | __be32 flags = *(__be32 *)(data + doffset); |
145 | ||
146 | doffset += GUE_LEN_PRIV; | |
147 | ||
148 | if (flags & GUE_PFLAG_REMCSUM) { | |
149 | guehdr = gue_remcsum(skb, guehdr, data + doffset, | |
fe881ef1 TH |
150 | hdrlen, guehdr->proto_ctype, |
151 | !!(fou->flags & | |
152 | FOU_F_REMCSUM_NOPARTIAL)); | |
a8d31c12 TH |
153 | if (!guehdr) |
154 | goto drop; | |
155 | ||
156 | data = &guehdr[1]; | |
5024c33a | 157 | |
a8d31c12 TH |
158 | doffset += GUE_PLEN_REMCSUM; |
159 | } | |
37dd0247 TH |
160 | } |
161 | ||
5024c33a TH |
162 | if (unlikely(guehdr->control)) |
163 | return gue_control_message(skb, guehdr); | |
164 | ||
4fd671de | 165 | __skb_pull(skb, sizeof(struct udphdr) + hdrlen); |
a8d31c12 TH |
166 | skb_reset_transport_header(skb); |
167 | ||
5024c33a TH |
168 | return -guehdr->proto_ctype; |
169 | ||
37dd0247 TH |
170 | drop: |
171 | kfree_skb(skb); | |
172 | return 0; | |
173 | } | |
174 | ||
afe93325 | 175 | static struct sk_buff **fou_gro_receive(struct sk_buff **head, |
a2b12f3c TH |
176 | struct sk_buff *skb, |
177 | struct udp_offload *uoff) | |
afe93325 TH |
178 | { |
179 | const struct net_offload *ops; | |
180 | struct sk_buff **pp = NULL; | |
181 | u8 proto = NAPI_GRO_CB(skb)->proto; | |
efc98d08 | 182 | const struct net_offload **offloads; |
afe93325 TH |
183 | |
184 | rcu_read_lock(); | |
efc98d08 | 185 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
186 | ops = rcu_dereference(offloads[proto]); |
187 | if (!ops || !ops->callbacks.gro_receive) | |
188 | goto out_unlock; | |
189 | ||
190 | pp = ops->callbacks.gro_receive(head, skb); | |
191 | ||
192 | out_unlock: | |
193 | rcu_read_unlock(); | |
194 | ||
195 | return pp; | |
196 | } | |
197 | ||
a2b12f3c TH |
198 | static int fou_gro_complete(struct sk_buff *skb, int nhoff, |
199 | struct udp_offload *uoff) | |
afe93325 TH |
200 | { |
201 | const struct net_offload *ops; | |
202 | u8 proto = NAPI_GRO_CB(skb)->proto; | |
203 | int err = -ENOSYS; | |
efc98d08 | 204 | const struct net_offload **offloads; |
afe93325 | 205 | |
cfdf1e1b JG |
206 | udp_tunnel_gro_complete(skb, nhoff); |
207 | ||
afe93325 | 208 | rcu_read_lock(); |
efc98d08 | 209 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
210 | ops = rcu_dereference(offloads[proto]); |
211 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
212 | goto out_unlock; | |
213 | ||
214 | err = ops->callbacks.gro_complete(skb, nhoff); | |
215 | ||
216 | out_unlock: | |
217 | rcu_read_unlock(); | |
218 | ||
219 | return err; | |
220 | } | |
221 | ||
a8d31c12 TH |
222 | static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, |
223 | struct guehdr *guehdr, void *data, | |
26c4f7da | 224 | size_t hdrlen, u8 ipproto, |
fe881ef1 | 225 | struct gro_remcsum *grc, bool nopartial) |
a8d31c12 TH |
226 | { |
227 | __be16 *pd = data; | |
4fd671de TH |
228 | size_t start = ntohs(pd[0]); |
229 | size_t offset = ntohs(pd[1]); | |
230 | size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start); | |
a8d31c12 TH |
231 | |
232 | if (skb->remcsum_offload) | |
26c4f7da | 233 | return NULL; |
a8d31c12 | 234 | |
4fd671de | 235 | if (!NAPI_GRO_CB(skb)->csum_valid) |
a8d31c12 TH |
236 | return NULL; |
237 | ||
a8d31c12 TH |
238 | /* Pull checksum that will be written */ |
239 | if (skb_gro_header_hard(skb, off + plen)) { | |
240 | guehdr = skb_gro_header_slow(skb, off + plen, off); | |
241 | if (!guehdr) | |
242 | return NULL; | |
243 | } | |
244 | ||
26c4f7da | 245 | skb_gro_remcsum_process(skb, (void *)guehdr + hdrlen, |
fe881ef1 | 246 | start, offset, grc, nopartial); |
a8d31c12 TH |
247 | |
248 | skb->remcsum_offload = 1; | |
249 | ||
250 | return guehdr; | |
251 | } | |
252 | ||
37dd0247 | 253 | static struct sk_buff **gue_gro_receive(struct sk_buff **head, |
a2b12f3c TH |
254 | struct sk_buff *skb, |
255 | struct udp_offload *uoff) | |
37dd0247 TH |
256 | { |
257 | const struct net_offload **offloads; | |
258 | const struct net_offload *ops; | |
259 | struct sk_buff **pp = NULL; | |
260 | struct sk_buff *p; | |
37dd0247 | 261 | struct guehdr *guehdr; |
5024c33a TH |
262 | size_t len, optlen, hdrlen, off; |
263 | void *data; | |
a8d31c12 | 264 | u16 doffset = 0; |
37dd0247 | 265 | int flush = 1; |
fe881ef1 | 266 | struct fou *fou = container_of(uoff, struct fou, udp_offloads); |
26c4f7da TH |
267 | struct gro_remcsum grc; |
268 | ||
269 | skb_gro_remcsum_init(&grc); | |
37dd0247 TH |
270 | |
271 | off = skb_gro_offset(skb); | |
5024c33a TH |
272 | len = off + sizeof(*guehdr); |
273 | ||
37dd0247 | 274 | guehdr = skb_gro_header_fast(skb, off); |
5024c33a TH |
275 | if (skb_gro_header_hard(skb, len)) { |
276 | guehdr = skb_gro_header_slow(skb, len, off); | |
37dd0247 TH |
277 | if (unlikely(!guehdr)) |
278 | goto out; | |
279 | } | |
280 | ||
5024c33a TH |
281 | optlen = guehdr->hlen << 2; |
282 | len += optlen; | |
37dd0247 | 283 | |
5024c33a TH |
284 | if (skb_gro_header_hard(skb, len)) { |
285 | guehdr = skb_gro_header_slow(skb, len, off); | |
286 | if (unlikely(!guehdr)) | |
287 | goto out; | |
288 | } | |
37dd0247 | 289 | |
5024c33a TH |
290 | if (unlikely(guehdr->control) || guehdr->version != 0 || |
291 | validate_gue_flags(guehdr, optlen)) | |
292 | goto out; | |
37dd0247 | 293 | |
5024c33a TH |
294 | hdrlen = sizeof(*guehdr) + optlen; |
295 | ||
a8d31c12 TH |
296 | /* Adjust NAPI_GRO_CB(skb)->csum to account for guehdr, |
297 | * this is needed if there is a remote checkcsum offload. | |
298 | */ | |
5024c33a TH |
299 | skb_gro_postpull_rcsum(skb, guehdr, hdrlen); |
300 | ||
301 | data = &guehdr[1]; | |
302 | ||
303 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 | 304 | __be32 flags = *(__be32 *)(data + doffset); |
5024c33a | 305 | |
a8d31c12 TH |
306 | doffset += GUE_LEN_PRIV; |
307 | ||
308 | if (flags & GUE_PFLAG_REMCSUM) { | |
309 | guehdr = gue_gro_remcsum(skb, off, guehdr, | |
310 | data + doffset, hdrlen, | |
fe881ef1 TH |
311 | guehdr->proto_ctype, &grc, |
312 | !!(fou->flags & | |
313 | FOU_F_REMCSUM_NOPARTIAL)); | |
a8d31c12 TH |
314 | if (!guehdr) |
315 | goto out; | |
316 | ||
317 | data = &guehdr[1]; | |
318 | ||
319 | doffset += GUE_PLEN_REMCSUM; | |
320 | } | |
37dd0247 TH |
321 | } |
322 | ||
a8d31c12 TH |
323 | skb_gro_pull(skb, hdrlen); |
324 | ||
37dd0247 TH |
325 | flush = 0; |
326 | ||
327 | for (p = *head; p; p = p->next) { | |
328 | const struct guehdr *guehdr2; | |
329 | ||
330 | if (!NAPI_GRO_CB(p)->same_flow) | |
331 | continue; | |
332 | ||
333 | guehdr2 = (struct guehdr *)(p->data + off); | |
334 | ||
335 | /* Compare base GUE header to be equal (covers | |
5024c33a | 336 | * hlen, version, proto_ctype, and flags. |
37dd0247 TH |
337 | */ |
338 | if (guehdr->word != guehdr2->word) { | |
339 | NAPI_GRO_CB(p)->same_flow = 0; | |
340 | continue; | |
341 | } | |
342 | ||
343 | /* Compare optional fields are the same. */ | |
344 | if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1], | |
345 | guehdr->hlen << 2)) { | |
346 | NAPI_GRO_CB(p)->same_flow = 0; | |
347 | continue; | |
348 | } | |
349 | } | |
350 | ||
5024c33a TH |
351 | rcu_read_lock(); |
352 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
353 | ops = rcu_dereference(offloads[guehdr->proto_ctype]); | |
354 | if (WARN_ON(!ops || !ops->callbacks.gro_receive)) | |
355 | goto out_unlock; | |
37dd0247 TH |
356 | |
357 | pp = ops->callbacks.gro_receive(head, skb); | |
358 | ||
359 | out_unlock: | |
360 | rcu_read_unlock(); | |
361 | out: | |
362 | NAPI_GRO_CB(skb)->flush |= flush; | |
26c4f7da | 363 | skb_gro_remcsum_cleanup(skb, &grc); |
37dd0247 TH |
364 | |
365 | return pp; | |
366 | } | |
367 | ||
a2b12f3c TH |
368 | static int gue_gro_complete(struct sk_buff *skb, int nhoff, |
369 | struct udp_offload *uoff) | |
37dd0247 TH |
370 | { |
371 | const struct net_offload **offloads; | |
372 | struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff); | |
373 | const struct net_offload *ops; | |
374 | unsigned int guehlen; | |
375 | u8 proto; | |
376 | int err = -ENOENT; | |
377 | ||
5024c33a | 378 | proto = guehdr->proto_ctype; |
37dd0247 TH |
379 | |
380 | guehlen = sizeof(*guehdr) + (guehdr->hlen << 2); | |
381 | ||
382 | rcu_read_lock(); | |
383 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
384 | ops = rcu_dereference(offloads[proto]); | |
385 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
386 | goto out_unlock; | |
387 | ||
388 | err = ops->callbacks.gro_complete(skb, nhoff + guehlen); | |
389 | ||
390 | out_unlock: | |
391 | rcu_read_unlock(); | |
392 | return err; | |
393 | } | |
394 | ||
02d793c5 | 395 | static int fou_add_to_port_list(struct net *net, struct fou *fou) |
23461551 | 396 | { |
02d793c5 | 397 | struct fou_net *fn = net_generic(net, fou_net_id); |
23461551 TH |
398 | struct fou *fout; |
399 | ||
02d793c5 WC |
400 | mutex_lock(&fn->fou_lock); |
401 | list_for_each_entry(fout, &fn->fou_list, list) { | |
23461551 | 402 | if (fou->port == fout->port) { |
02d793c5 | 403 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
404 | return -EALREADY; |
405 | } | |
406 | } | |
407 | ||
02d793c5 WC |
408 | list_add(&fou->list, &fn->fou_list); |
409 | mutex_unlock(&fn->fou_lock); | |
23461551 TH |
410 | |
411 | return 0; | |
412 | } | |
413 | ||
414 | static void fou_release(struct fou *fou) | |
415 | { | |
416 | struct socket *sock = fou->sock; | |
417 | struct sock *sk = sock->sk; | |
418 | ||
9272f048 WC |
419 | if (sk->sk_family == AF_INET) |
420 | udp_del_offload(&fou->udp_offloads); | |
23461551 | 421 | list_del(&fou->list); |
02d793c5 | 422 | udp_tunnel_sock_release(sock); |
23461551 TH |
423 | |
424 | kfree(fou); | |
425 | } | |
426 | ||
37dd0247 TH |
427 | static int fou_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) |
428 | { | |
429 | udp_sk(sk)->encap_rcv = fou_udp_recv; | |
430 | fou->protocol = cfg->protocol; | |
431 | fou->udp_offloads.callbacks.gro_receive = fou_gro_receive; | |
432 | fou->udp_offloads.callbacks.gro_complete = fou_gro_complete; | |
433 | fou->udp_offloads.port = cfg->udp_config.local_udp_port; | |
434 | fou->udp_offloads.ipproto = cfg->protocol; | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | static int gue_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) | |
440 | { | |
441 | udp_sk(sk)->encap_rcv = gue_udp_recv; | |
442 | fou->udp_offloads.callbacks.gro_receive = gue_gro_receive; | |
443 | fou->udp_offloads.callbacks.gro_complete = gue_gro_complete; | |
444 | fou->udp_offloads.port = cfg->udp_config.local_udp_port; | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
23461551 TH |
449 | static int fou_create(struct net *net, struct fou_cfg *cfg, |
450 | struct socket **sockp) | |
451 | { | |
23461551 | 452 | struct socket *sock = NULL; |
02d793c5 | 453 | struct fou *fou = NULL; |
23461551 | 454 | struct sock *sk; |
02d793c5 | 455 | int err; |
23461551 TH |
456 | |
457 | /* Open UDP socket */ | |
458 | err = udp_sock_create(net, &cfg->udp_config, &sock); | |
459 | if (err < 0) | |
460 | goto error; | |
461 | ||
462 | /* Allocate FOU port structure */ | |
463 | fou = kzalloc(sizeof(*fou), GFP_KERNEL); | |
464 | if (!fou) { | |
465 | err = -ENOMEM; | |
466 | goto error; | |
467 | } | |
468 | ||
469 | sk = sock->sk; | |
470 | ||
fe881ef1 | 471 | fou->flags = cfg->flags; |
37dd0247 TH |
472 | fou->port = cfg->udp_config.local_udp_port; |
473 | ||
474 | /* Initial for fou type */ | |
475 | switch (cfg->type) { | |
476 | case FOU_ENCAP_DIRECT: | |
477 | err = fou_encap_init(sk, fou, cfg); | |
478 | if (err) | |
479 | goto error; | |
480 | break; | |
481 | case FOU_ENCAP_GUE: | |
482 | err = gue_encap_init(sk, fou, cfg); | |
483 | if (err) | |
484 | goto error; | |
485 | break; | |
486 | default: | |
487 | err = -EINVAL; | |
488 | goto error; | |
489 | } | |
23461551 | 490 | |
7a6c8c34 WC |
491 | fou->type = cfg->type; |
492 | ||
23461551 TH |
493 | udp_sk(sk)->encap_type = 1; |
494 | udp_encap_enable(); | |
495 | ||
496 | sk->sk_user_data = fou; | |
497 | fou->sock = sock; | |
498 | ||
224d019c | 499 | inet_inc_convert_csum(sk); |
23461551 TH |
500 | |
501 | sk->sk_allocation = GFP_ATOMIC; | |
502 | ||
afe93325 TH |
503 | if (cfg->udp_config.family == AF_INET) { |
504 | err = udp_add_offload(&fou->udp_offloads); | |
505 | if (err) | |
506 | goto error; | |
507 | } | |
508 | ||
02d793c5 | 509 | err = fou_add_to_port_list(net, fou); |
23461551 TH |
510 | if (err) |
511 | goto error; | |
512 | ||
513 | if (sockp) | |
514 | *sockp = sock; | |
515 | ||
516 | return 0; | |
517 | ||
518 | error: | |
519 | kfree(fou); | |
520 | if (sock) | |
02d793c5 | 521 | udp_tunnel_sock_release(sock); |
23461551 TH |
522 | |
523 | return err; | |
524 | } | |
525 | ||
526 | static int fou_destroy(struct net *net, struct fou_cfg *cfg) | |
527 | { | |
02d793c5 | 528 | struct fou_net *fn = net_generic(net, fou_net_id); |
4cbcdf2b | 529 | __be16 port = cfg->udp_config.local_udp_port; |
23461551 | 530 | int err = -EINVAL; |
02d793c5 | 531 | struct fou *fou; |
23461551 | 532 | |
02d793c5 WC |
533 | mutex_lock(&fn->fou_lock); |
534 | list_for_each_entry(fou, &fn->fou_list, list) { | |
23461551 TH |
535 | if (fou->port == port) { |
536 | fou_release(fou); | |
537 | err = 0; | |
538 | break; | |
539 | } | |
540 | } | |
02d793c5 | 541 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
542 | |
543 | return err; | |
544 | } | |
545 | ||
546 | static struct genl_family fou_nl_family = { | |
547 | .id = GENL_ID_GENERATE, | |
548 | .hdrsize = 0, | |
549 | .name = FOU_GENL_NAME, | |
550 | .version = FOU_GENL_VERSION, | |
551 | .maxattr = FOU_ATTR_MAX, | |
552 | .netnsok = true, | |
553 | }; | |
554 | ||
555 | static struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = { | |
556 | [FOU_ATTR_PORT] = { .type = NLA_U16, }, | |
557 | [FOU_ATTR_AF] = { .type = NLA_U8, }, | |
558 | [FOU_ATTR_IPPROTO] = { .type = NLA_U8, }, | |
37dd0247 | 559 | [FOU_ATTR_TYPE] = { .type = NLA_U8, }, |
fe881ef1 | 560 | [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, }, |
23461551 TH |
561 | }; |
562 | ||
563 | static int parse_nl_config(struct genl_info *info, | |
564 | struct fou_cfg *cfg) | |
565 | { | |
566 | memset(cfg, 0, sizeof(*cfg)); | |
567 | ||
568 | cfg->udp_config.family = AF_INET; | |
569 | ||
570 | if (info->attrs[FOU_ATTR_AF]) { | |
571 | u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]); | |
572 | ||
573 | if (family != AF_INET && family != AF_INET6) | |
574 | return -EINVAL; | |
575 | ||
576 | cfg->udp_config.family = family; | |
577 | } | |
578 | ||
579 | if (info->attrs[FOU_ATTR_PORT]) { | |
4cbcdf2b | 580 | __be16 port = nla_get_be16(info->attrs[FOU_ATTR_PORT]); |
23461551 TH |
581 | |
582 | cfg->udp_config.local_udp_port = port; | |
583 | } | |
584 | ||
585 | if (info->attrs[FOU_ATTR_IPPROTO]) | |
586 | cfg->protocol = nla_get_u8(info->attrs[FOU_ATTR_IPPROTO]); | |
587 | ||
37dd0247 TH |
588 | if (info->attrs[FOU_ATTR_TYPE]) |
589 | cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]); | |
590 | ||
fe881ef1 TH |
591 | if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL]) |
592 | cfg->flags |= FOU_F_REMCSUM_NOPARTIAL; | |
593 | ||
23461551 TH |
594 | return 0; |
595 | } | |
596 | ||
597 | static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info) | |
598 | { | |
02d793c5 | 599 | struct net *net = genl_info_net(info); |
23461551 TH |
600 | struct fou_cfg cfg; |
601 | int err; | |
602 | ||
603 | err = parse_nl_config(info, &cfg); | |
604 | if (err) | |
605 | return err; | |
606 | ||
02d793c5 | 607 | return fou_create(net, &cfg, NULL); |
23461551 TH |
608 | } |
609 | ||
610 | static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info) | |
611 | { | |
02d793c5 | 612 | struct net *net = genl_info_net(info); |
23461551 | 613 | struct fou_cfg cfg; |
67270636 | 614 | int err; |
23461551 | 615 | |
67270636 WC |
616 | err = parse_nl_config(info, &cfg); |
617 | if (err) | |
618 | return err; | |
23461551 | 619 | |
02d793c5 | 620 | return fou_destroy(net, &cfg); |
23461551 TH |
621 | } |
622 | ||
7a6c8c34 WC |
623 | static int fou_fill_info(struct fou *fou, struct sk_buff *msg) |
624 | { | |
625 | if (nla_put_u8(msg, FOU_ATTR_AF, fou->sock->sk->sk_family) || | |
626 | nla_put_be16(msg, FOU_ATTR_PORT, fou->port) || | |
627 | nla_put_u8(msg, FOU_ATTR_IPPROTO, fou->protocol) || | |
628 | nla_put_u8(msg, FOU_ATTR_TYPE, fou->type)) | |
629 | return -1; | |
630 | ||
631 | if (fou->flags & FOU_F_REMCSUM_NOPARTIAL) | |
632 | if (nla_put_flag(msg, FOU_ATTR_REMCSUM_NOPARTIAL)) | |
633 | return -1; | |
634 | return 0; | |
635 | } | |
636 | ||
637 | static int fou_dump_info(struct fou *fou, u32 portid, u32 seq, | |
638 | u32 flags, struct sk_buff *skb, u8 cmd) | |
639 | { | |
640 | void *hdr; | |
641 | ||
642 | hdr = genlmsg_put(skb, portid, seq, &fou_nl_family, flags, cmd); | |
643 | if (!hdr) | |
644 | return -ENOMEM; | |
645 | ||
646 | if (fou_fill_info(fou, skb) < 0) | |
647 | goto nla_put_failure; | |
648 | ||
649 | genlmsg_end(skb, hdr); | |
650 | return 0; | |
651 | ||
652 | nla_put_failure: | |
653 | genlmsg_cancel(skb, hdr); | |
654 | return -EMSGSIZE; | |
655 | } | |
656 | ||
657 | static int fou_nl_cmd_get_port(struct sk_buff *skb, struct genl_info *info) | |
658 | { | |
659 | struct net *net = genl_info_net(info); | |
660 | struct fou_net *fn = net_generic(net, fou_net_id); | |
661 | struct sk_buff *msg; | |
662 | struct fou_cfg cfg; | |
663 | struct fou *fout; | |
664 | __be16 port; | |
665 | int ret; | |
666 | ||
667 | ret = parse_nl_config(info, &cfg); | |
668 | if (ret) | |
669 | return ret; | |
670 | port = cfg.udp_config.local_udp_port; | |
671 | if (port == 0) | |
672 | return -EINVAL; | |
673 | ||
674 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
675 | if (!msg) | |
676 | return -ENOMEM; | |
677 | ||
678 | ret = -ESRCH; | |
679 | mutex_lock(&fn->fou_lock); | |
680 | list_for_each_entry(fout, &fn->fou_list, list) { | |
681 | if (port == fout->port) { | |
682 | ret = fou_dump_info(fout, info->snd_portid, | |
683 | info->snd_seq, 0, msg, | |
684 | info->genlhdr->cmd); | |
685 | break; | |
686 | } | |
687 | } | |
688 | mutex_unlock(&fn->fou_lock); | |
689 | if (ret < 0) | |
690 | goto out_free; | |
691 | ||
692 | return genlmsg_reply(msg, info); | |
693 | ||
694 | out_free: | |
695 | nlmsg_free(msg); | |
696 | return ret; | |
697 | } | |
698 | ||
699 | static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
700 | { | |
701 | struct net *net = sock_net(skb->sk); | |
702 | struct fou_net *fn = net_generic(net, fou_net_id); | |
703 | struct fou *fout; | |
704 | int idx = 0, ret; | |
705 | ||
706 | mutex_lock(&fn->fou_lock); | |
707 | list_for_each_entry(fout, &fn->fou_list, list) { | |
708 | if (idx++ < cb->args[0]) | |
709 | continue; | |
710 | ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid, | |
711 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
712 | skb, FOU_CMD_GET); | |
713 | if (ret) | |
540207ae | 714 | break; |
7a6c8c34 WC |
715 | } |
716 | mutex_unlock(&fn->fou_lock); | |
717 | ||
7a6c8c34 WC |
718 | cb->args[0] = idx; |
719 | return skb->len; | |
720 | } | |
721 | ||
23461551 TH |
722 | static const struct genl_ops fou_nl_ops[] = { |
723 | { | |
724 | .cmd = FOU_CMD_ADD, | |
725 | .doit = fou_nl_cmd_add_port, | |
726 | .policy = fou_nl_policy, | |
727 | .flags = GENL_ADMIN_PERM, | |
728 | }, | |
729 | { | |
730 | .cmd = FOU_CMD_DEL, | |
731 | .doit = fou_nl_cmd_rm_port, | |
732 | .policy = fou_nl_policy, | |
733 | .flags = GENL_ADMIN_PERM, | |
734 | }, | |
7a6c8c34 WC |
735 | { |
736 | .cmd = FOU_CMD_GET, | |
737 | .doit = fou_nl_cmd_get_port, | |
738 | .dumpit = fou_nl_dump, | |
739 | .policy = fou_nl_policy, | |
740 | }, | |
23461551 TH |
741 | }; |
742 | ||
a8c5f90f TH |
743 | size_t fou_encap_hlen(struct ip_tunnel_encap *e) |
744 | { | |
745 | return sizeof(struct udphdr); | |
746 | } | |
747 | EXPORT_SYMBOL(fou_encap_hlen); | |
748 | ||
749 | size_t gue_encap_hlen(struct ip_tunnel_encap *e) | |
750 | { | |
751 | size_t len; | |
752 | bool need_priv = false; | |
753 | ||
754 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
755 | ||
756 | if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) { | |
757 | len += GUE_PLEN_REMCSUM; | |
758 | need_priv = true; | |
759 | } | |
760 | ||
761 | len += need_priv ? GUE_LEN_PRIV : 0; | |
762 | ||
763 | return len; | |
764 | } | |
765 | EXPORT_SYMBOL(gue_encap_hlen); | |
766 | ||
63487bab TH |
767 | static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e, |
768 | struct flowi4 *fl4, u8 *protocol, __be16 sport) | |
769 | { | |
770 | struct udphdr *uh; | |
771 | ||
772 | skb_push(skb, sizeof(struct udphdr)); | |
773 | skb_reset_transport_header(skb); | |
774 | ||
775 | uh = udp_hdr(skb); | |
776 | ||
777 | uh->dest = e->dport; | |
778 | uh->source = sport; | |
779 | uh->len = htons(skb->len); | |
780 | uh->check = 0; | |
781 | udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb, | |
782 | fl4->saddr, fl4->daddr, skb->len); | |
783 | ||
784 | *protocol = IPPROTO_UDP; | |
785 | } | |
786 | ||
787 | int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
788 | u8 *protocol, struct flowi4 *fl4) | |
789 | { | |
790 | bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM); | |
791 | int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; | |
792 | __be16 sport; | |
793 | ||
794 | skb = iptunnel_handle_offloads(skb, csum, type); | |
795 | ||
796 | if (IS_ERR(skb)) | |
797 | return PTR_ERR(skb); | |
798 | ||
799 | sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
800 | skb, 0, 0, false); | |
801 | fou_build_udp(skb, e, fl4, protocol, sport); | |
802 | ||
803 | return 0; | |
804 | } | |
805 | EXPORT_SYMBOL(fou_build_header); | |
806 | ||
807 | int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
808 | u8 *protocol, struct flowi4 *fl4) | |
809 | { | |
810 | bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM); | |
811 | int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; | |
812 | struct guehdr *guehdr; | |
b17f709a | 813 | size_t hdrlen, optlen = 0; |
63487bab | 814 | __be16 sport; |
5024c33a TH |
815 | void *data; |
816 | bool need_priv = false; | |
817 | ||
b17f709a TH |
818 | if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) && |
819 | skb->ip_summed == CHECKSUM_PARTIAL) { | |
820 | csum = false; | |
821 | optlen += GUE_PLEN_REMCSUM; | |
822 | type |= SKB_GSO_TUNNEL_REMCSUM; | |
823 | need_priv = true; | |
824 | } | |
825 | ||
5024c33a | 826 | optlen += need_priv ? GUE_LEN_PRIV : 0; |
63487bab TH |
827 | |
828 | skb = iptunnel_handle_offloads(skb, csum, type); | |
829 | ||
830 | if (IS_ERR(skb)) | |
831 | return PTR_ERR(skb); | |
832 | ||
833 | /* Get source port (based on flow hash) before skb_push */ | |
834 | sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
835 | skb, 0, 0, false); | |
836 | ||
b17f709a TH |
837 | hdrlen = sizeof(struct guehdr) + optlen; |
838 | ||
839 | skb_push(skb, hdrlen); | |
63487bab TH |
840 | |
841 | guehdr = (struct guehdr *)skb->data; | |
842 | ||
5024c33a | 843 | guehdr->control = 0; |
63487bab | 844 | guehdr->version = 0; |
5024c33a | 845 | guehdr->hlen = optlen >> 2; |
63487bab | 846 | guehdr->flags = 0; |
5024c33a TH |
847 | guehdr->proto_ctype = *protocol; |
848 | ||
849 | data = &guehdr[1]; | |
850 | ||
851 | if (need_priv) { | |
852 | __be32 *flags = data; | |
853 | ||
854 | guehdr->flags |= GUE_FLAG_PRIV; | |
855 | *flags = 0; | |
856 | data += GUE_LEN_PRIV; | |
857 | ||
b17f709a TH |
858 | if (type & SKB_GSO_TUNNEL_REMCSUM) { |
859 | u16 csum_start = skb_checksum_start_offset(skb); | |
860 | __be16 *pd = data; | |
861 | ||
862 | if (csum_start < hdrlen) | |
863 | return -EINVAL; | |
864 | ||
865 | csum_start -= hdrlen; | |
866 | pd[0] = htons(csum_start); | |
867 | pd[1] = htons(csum_start + skb->csum_offset); | |
868 | ||
869 | if (!skb_is_gso(skb)) { | |
870 | skb->ip_summed = CHECKSUM_NONE; | |
871 | skb->encapsulation = 0; | |
872 | } | |
873 | ||
874 | *flags |= GUE_PFLAG_REMCSUM; | |
875 | data += GUE_PLEN_REMCSUM; | |
876 | } | |
877 | ||
5024c33a | 878 | } |
63487bab TH |
879 | |
880 | fou_build_udp(skb, e, fl4, protocol, sport); | |
881 | ||
882 | return 0; | |
883 | } | |
884 | EXPORT_SYMBOL(gue_build_header); | |
885 | ||
a8c5f90f TH |
886 | #ifdef CONFIG_NET_FOU_IP_TUNNELS |
887 | ||
5eeb2922 | 888 | static const struct ip_tunnel_encap_ops fou_iptun_ops = { |
a8c5f90f TH |
889 | .encap_hlen = fou_encap_hlen, |
890 | .build_header = fou_build_header, | |
891 | }; | |
892 | ||
5eeb2922 | 893 | static const struct ip_tunnel_encap_ops gue_iptun_ops = { |
a8c5f90f TH |
894 | .encap_hlen = gue_encap_hlen, |
895 | .build_header = gue_build_header, | |
896 | }; | |
897 | ||
898 | static int ip_tunnel_encap_add_fou_ops(void) | |
899 | { | |
900 | int ret; | |
901 | ||
902 | ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
903 | if (ret < 0) { | |
904 | pr_err("can't add fou ops\n"); | |
905 | return ret; | |
906 | } | |
907 | ||
908 | ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
909 | if (ret < 0) { | |
910 | pr_err("can't add gue ops\n"); | |
911 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
912 | return ret; | |
913 | } | |
914 | ||
915 | return 0; | |
916 | } | |
917 | ||
918 | static void ip_tunnel_encap_del_fou_ops(void) | |
919 | { | |
920 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
921 | ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
922 | } | |
923 | ||
924 | #else | |
925 | ||
926 | static int ip_tunnel_encap_add_fou_ops(void) | |
927 | { | |
928 | return 0; | |
929 | } | |
930 | ||
882288c0 | 931 | static void ip_tunnel_encap_del_fou_ops(void) |
a8c5f90f TH |
932 | { |
933 | } | |
934 | ||
935 | #endif | |
936 | ||
02d793c5 WC |
937 | static __net_init int fou_init_net(struct net *net) |
938 | { | |
939 | struct fou_net *fn = net_generic(net, fou_net_id); | |
940 | ||
941 | INIT_LIST_HEAD(&fn->fou_list); | |
942 | mutex_init(&fn->fou_lock); | |
943 | return 0; | |
944 | } | |
945 | ||
946 | static __net_exit void fou_exit_net(struct net *net) | |
947 | { | |
948 | struct fou_net *fn = net_generic(net, fou_net_id); | |
949 | struct fou *fou, *next; | |
950 | ||
951 | /* Close all the FOU sockets */ | |
952 | mutex_lock(&fn->fou_lock); | |
953 | list_for_each_entry_safe(fou, next, &fn->fou_list, list) | |
954 | fou_release(fou); | |
955 | mutex_unlock(&fn->fou_lock); | |
956 | } | |
957 | ||
958 | static struct pernet_operations fou_net_ops = { | |
959 | .init = fou_init_net, | |
960 | .exit = fou_exit_net, | |
961 | .id = &fou_net_id, | |
962 | .size = sizeof(struct fou_net), | |
963 | }; | |
964 | ||
23461551 TH |
965 | static int __init fou_init(void) |
966 | { | |
967 | int ret; | |
968 | ||
02d793c5 WC |
969 | ret = register_pernet_device(&fou_net_ops); |
970 | if (ret) | |
971 | goto exit; | |
972 | ||
23461551 TH |
973 | ret = genl_register_family_with_ops(&fou_nl_family, |
974 | fou_nl_ops); | |
a8c5f90f | 975 | if (ret < 0) |
02d793c5 | 976 | goto unregister; |
a8c5f90f TH |
977 | |
978 | ret = ip_tunnel_encap_add_fou_ops(); | |
02d793c5 WC |
979 | if (ret == 0) |
980 | return 0; | |
a8c5f90f | 981 | |
02d793c5 WC |
982 | genl_unregister_family(&fou_nl_family); |
983 | unregister: | |
984 | unregister_pernet_device(&fou_net_ops); | |
a8c5f90f | 985 | exit: |
23461551 TH |
986 | return ret; |
987 | } | |
988 | ||
989 | static void __exit fou_fini(void) | |
990 | { | |
a8c5f90f | 991 | ip_tunnel_encap_del_fou_ops(); |
23461551 | 992 | genl_unregister_family(&fou_nl_family); |
02d793c5 | 993 | unregister_pernet_device(&fou_net_ops); |
23461551 TH |
994 | } |
995 | ||
996 | module_init(fou_init); | |
997 | module_exit(fou_fini); | |
998 | MODULE_AUTHOR("Tom Herbert <therbert@google.com>"); | |
999 | MODULE_LICENSE("GPL"); |