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