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; |
23461551 | 25 | struct list_head list; |
3036facb | 26 | struct rcu_head rcu; |
23461551 TH |
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 | ||
a09a4c8d | 50 | static int 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); | |
a09a4c8d | 61 | return iptunnel_pull_offloads(skb); |
23461551 TH |
62 | } |
63 | ||
64 | static int fou_udp_recv(struct sock *sk, struct sk_buff *skb) | |
65 | { | |
66 | struct fou *fou = fou_from_sock(sk); | |
67 | ||
68 | if (!fou) | |
69 | return 1; | |
70 | ||
a09a4c8d JG |
71 | if (fou_recv_pull(skb, sizeof(struct udphdr))) |
72 | goto drop; | |
5024c33a TH |
73 | |
74 | return -fou->protocol; | |
a09a4c8d JG |
75 | |
76 | drop: | |
77 | kfree_skb(skb); | |
78 | return 0; | |
5024c33a TH |
79 | } |
80 | ||
a8d31c12 | 81 | static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr, |
fe881ef1 TH |
82 | void *data, size_t hdrlen, u8 ipproto, |
83 | bool nopartial) | |
a8d31c12 TH |
84 | { |
85 | __be16 *pd = data; | |
4fd671de TH |
86 | size_t start = ntohs(pd[0]); |
87 | size_t offset = ntohs(pd[1]); | |
b7fe10e5 TH |
88 | size_t plen = sizeof(struct udphdr) + hdrlen + |
89 | max_t(size_t, offset + sizeof(u16), start); | |
90 | ||
91 | if (skb->remcsum_offload) | |
92 | return guehdr; | |
a8d31c12 | 93 | |
a8d31c12 TH |
94 | if (!pskb_may_pull(skb, plen)) |
95 | return NULL; | |
96 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
97 | ||
fe881ef1 TH |
98 | skb_remcsum_process(skb, (void *)guehdr + hdrlen, |
99 | start, offset, nopartial); | |
a8d31c12 TH |
100 | |
101 | return guehdr; | |
102 | } | |
103 | ||
5024c33a TH |
104 | static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr) |
105 | { | |
106 | /* No support yet */ | |
107 | kfree_skb(skb); | |
108 | return 0; | |
23461551 TH |
109 | } |
110 | ||
37dd0247 TH |
111 | static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) |
112 | { | |
113 | struct fou *fou = fou_from_sock(sk); | |
5024c33a | 114 | size_t len, optlen, hdrlen; |
37dd0247 | 115 | struct guehdr *guehdr; |
5024c33a | 116 | void *data; |
a8d31c12 | 117 | u16 doffset = 0; |
37dd0247 TH |
118 | |
119 | if (!fou) | |
120 | return 1; | |
121 | ||
122 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
123 | if (!pskb_may_pull(skb, len)) | |
124 | goto drop; | |
125 | ||
5024c33a TH |
126 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; |
127 | ||
128 | optlen = guehdr->hlen << 2; | |
129 | len += optlen; | |
37dd0247 | 130 | |
37dd0247 TH |
131 | if (!pskb_may_pull(skb, len)) |
132 | goto drop; | |
133 | ||
5024c33a TH |
134 | /* guehdr may change after pull */ |
135 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
d8f00d27 | 136 | |
5024c33a | 137 | hdrlen = sizeof(struct guehdr) + optlen; |
37dd0247 | 138 | |
5024c33a | 139 | if (guehdr->version != 0 || validate_gue_flags(guehdr, optlen)) |
37dd0247 | 140 | goto drop; |
5024c33a | 141 | |
a8d31c12 TH |
142 | hdrlen = sizeof(struct guehdr) + optlen; |
143 | ||
144 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len); | |
145 | ||
a8d31c12 TH |
146 | /* Pull csum through the guehdr now . This can be used if |
147 | * there is a remote checksum offload. | |
148 | */ | |
149 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
5024c33a TH |
150 | |
151 | data = &guehdr[1]; | |
152 | ||
153 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 TH |
154 | __be32 flags = *(__be32 *)(data + doffset); |
155 | ||
156 | doffset += GUE_LEN_PRIV; | |
157 | ||
158 | if (flags & GUE_PFLAG_REMCSUM) { | |
159 | guehdr = gue_remcsum(skb, guehdr, data + doffset, | |
fe881ef1 TH |
160 | hdrlen, guehdr->proto_ctype, |
161 | !!(fou->flags & | |
162 | FOU_F_REMCSUM_NOPARTIAL)); | |
a8d31c12 TH |
163 | if (!guehdr) |
164 | goto drop; | |
165 | ||
166 | data = &guehdr[1]; | |
5024c33a | 167 | |
a8d31c12 TH |
168 | doffset += GUE_PLEN_REMCSUM; |
169 | } | |
37dd0247 TH |
170 | } |
171 | ||
5024c33a TH |
172 | if (unlikely(guehdr->control)) |
173 | return gue_control_message(skb, guehdr); | |
174 | ||
4fd671de | 175 | __skb_pull(skb, sizeof(struct udphdr) + hdrlen); |
a8d31c12 TH |
176 | skb_reset_transport_header(skb); |
177 | ||
a09a4c8d JG |
178 | if (iptunnel_pull_offloads(skb)) |
179 | goto drop; | |
180 | ||
5024c33a TH |
181 | return -guehdr->proto_ctype; |
182 | ||
37dd0247 TH |
183 | drop: |
184 | kfree_skb(skb); | |
185 | return 0; | |
186 | } | |
187 | ||
d92283e3 TH |
188 | static struct sk_buff **fou_gro_receive(struct sock *sk, |
189 | struct sk_buff **head, | |
190 | struct sk_buff *skb) | |
afe93325 TH |
191 | { |
192 | const struct net_offload *ops; | |
193 | struct sk_buff **pp = NULL; | |
d92283e3 | 194 | u8 proto = fou_from_sock(sk)->protocol; |
efc98d08 | 195 | const struct net_offload **offloads; |
afe93325 | 196 | |
c3483384 AD |
197 | /* We can clear the encap_mark for FOU as we are essentially doing |
198 | * one of two possible things. We are either adding an L4 tunnel | |
199 | * header to the outer L3 tunnel header, or we are are simply | |
200 | * treating the GRE tunnel header as though it is a UDP protocol | |
201 | * specific header such as VXLAN or GENEVE. | |
202 | */ | |
203 | NAPI_GRO_CB(skb)->encap_mark = 0; | |
204 | ||
a0ca153f AD |
205 | /* Flag this frame as already having an outer encap header */ |
206 | NAPI_GRO_CB(skb)->is_fou = 1; | |
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 (!ops || !ops->callbacks.gro_receive) | |
212 | goto out_unlock; | |
213 | ||
214 | pp = ops->callbacks.gro_receive(head, skb); | |
215 | ||
216 | out_unlock: | |
217 | rcu_read_unlock(); | |
218 | ||
219 | return pp; | |
220 | } | |
221 | ||
d92283e3 TH |
222 | static int fou_gro_complete(struct sock *sk, struct sk_buff *skb, |
223 | int nhoff) | |
afe93325 TH |
224 | { |
225 | const struct net_offload *ops; | |
d92283e3 | 226 | u8 proto = fou_from_sock(sk)->protocol; |
afe93325 | 227 | int err = -ENOSYS; |
efc98d08 | 228 | const struct net_offload **offloads; |
afe93325 TH |
229 | |
230 | rcu_read_lock(); | |
efc98d08 | 231 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
232 | ops = rcu_dereference(offloads[proto]); |
233 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
234 | goto out_unlock; | |
235 | ||
236 | err = ops->callbacks.gro_complete(skb, nhoff); | |
237 | ||
229740c6 JR |
238 | skb_set_inner_mac_header(skb, nhoff); |
239 | ||
afe93325 TH |
240 | out_unlock: |
241 | rcu_read_unlock(); | |
242 | ||
243 | return err; | |
244 | } | |
245 | ||
a8d31c12 TH |
246 | static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, |
247 | struct guehdr *guehdr, void *data, | |
b7fe10e5 TH |
248 | size_t hdrlen, struct gro_remcsum *grc, |
249 | bool nopartial) | |
a8d31c12 TH |
250 | { |
251 | __be16 *pd = data; | |
4fd671de TH |
252 | size_t start = ntohs(pd[0]); |
253 | size_t offset = ntohs(pd[1]); | |
a8d31c12 TH |
254 | |
255 | if (skb->remcsum_offload) | |
b7fe10e5 | 256 | return guehdr; |
a8d31c12 | 257 | |
4fd671de | 258 | if (!NAPI_GRO_CB(skb)->csum_valid) |
a8d31c12 TH |
259 | return NULL; |
260 | ||
b7fe10e5 TH |
261 | guehdr = skb_gro_remcsum_process(skb, (void *)guehdr, off, hdrlen, |
262 | start, offset, grc, nopartial); | |
a8d31c12 TH |
263 | |
264 | skb->remcsum_offload = 1; | |
265 | ||
266 | return guehdr; | |
267 | } | |
268 | ||
d92283e3 TH |
269 | static struct sk_buff **gue_gro_receive(struct sock *sk, |
270 | struct sk_buff **head, | |
271 | struct sk_buff *skb) | |
37dd0247 TH |
272 | { |
273 | const struct net_offload **offloads; | |
274 | const struct net_offload *ops; | |
275 | struct sk_buff **pp = NULL; | |
276 | struct sk_buff *p; | |
37dd0247 | 277 | struct guehdr *guehdr; |
5024c33a TH |
278 | size_t len, optlen, hdrlen, off; |
279 | void *data; | |
a8d31c12 | 280 | u16 doffset = 0; |
37dd0247 | 281 | int flush = 1; |
d92283e3 | 282 | struct fou *fou = fou_from_sock(sk); |
26c4f7da TH |
283 | struct gro_remcsum grc; |
284 | ||
285 | skb_gro_remcsum_init(&grc); | |
37dd0247 TH |
286 | |
287 | off = skb_gro_offset(skb); | |
5024c33a TH |
288 | len = off + sizeof(*guehdr); |
289 | ||
37dd0247 | 290 | guehdr = skb_gro_header_fast(skb, off); |
5024c33a TH |
291 | if (skb_gro_header_hard(skb, len)) { |
292 | guehdr = skb_gro_header_slow(skb, len, off); | |
37dd0247 TH |
293 | if (unlikely(!guehdr)) |
294 | goto out; | |
295 | } | |
296 | ||
5024c33a TH |
297 | optlen = guehdr->hlen << 2; |
298 | len += optlen; | |
37dd0247 | 299 | |
5024c33a TH |
300 | if (skb_gro_header_hard(skb, len)) { |
301 | guehdr = skb_gro_header_slow(skb, len, off); | |
302 | if (unlikely(!guehdr)) | |
303 | goto out; | |
304 | } | |
37dd0247 | 305 | |
5024c33a TH |
306 | if (unlikely(guehdr->control) || guehdr->version != 0 || |
307 | validate_gue_flags(guehdr, optlen)) | |
308 | goto out; | |
37dd0247 | 309 | |
5024c33a TH |
310 | hdrlen = sizeof(*guehdr) + optlen; |
311 | ||
a8d31c12 TH |
312 | /* Adjust NAPI_GRO_CB(skb)->csum to account for guehdr, |
313 | * this is needed if there is a remote checkcsum offload. | |
314 | */ | |
5024c33a TH |
315 | skb_gro_postpull_rcsum(skb, guehdr, hdrlen); |
316 | ||
317 | data = &guehdr[1]; | |
318 | ||
319 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 | 320 | __be32 flags = *(__be32 *)(data + doffset); |
5024c33a | 321 | |
a8d31c12 TH |
322 | doffset += GUE_LEN_PRIV; |
323 | ||
324 | if (flags & GUE_PFLAG_REMCSUM) { | |
325 | guehdr = gue_gro_remcsum(skb, off, guehdr, | |
b7fe10e5 | 326 | data + doffset, hdrlen, &grc, |
fe881ef1 TH |
327 | !!(fou->flags & |
328 | FOU_F_REMCSUM_NOPARTIAL)); | |
b7fe10e5 | 329 | |
a8d31c12 TH |
330 | if (!guehdr) |
331 | goto out; | |
332 | ||
333 | data = &guehdr[1]; | |
334 | ||
335 | doffset += GUE_PLEN_REMCSUM; | |
336 | } | |
37dd0247 TH |
337 | } |
338 | ||
a8d31c12 TH |
339 | skb_gro_pull(skb, hdrlen); |
340 | ||
37dd0247 TH |
341 | for (p = *head; p; p = p->next) { |
342 | const struct guehdr *guehdr2; | |
343 | ||
344 | if (!NAPI_GRO_CB(p)->same_flow) | |
345 | continue; | |
346 | ||
347 | guehdr2 = (struct guehdr *)(p->data + off); | |
348 | ||
349 | /* Compare base GUE header to be equal (covers | |
5024c33a | 350 | * hlen, version, proto_ctype, and flags. |
37dd0247 TH |
351 | */ |
352 | if (guehdr->word != guehdr2->word) { | |
353 | NAPI_GRO_CB(p)->same_flow = 0; | |
354 | continue; | |
355 | } | |
356 | ||
357 | /* Compare optional fields are the same. */ | |
358 | if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1], | |
359 | guehdr->hlen << 2)) { | |
360 | NAPI_GRO_CB(p)->same_flow = 0; | |
361 | continue; | |
362 | } | |
363 | } | |
364 | ||
c3483384 AD |
365 | /* We can clear the encap_mark for GUE as we are essentially doing |
366 | * one of two possible things. We are either adding an L4 tunnel | |
367 | * header to the outer L3 tunnel header, or we are are simply | |
368 | * treating the GRE tunnel header as though it is a UDP protocol | |
369 | * specific header such as VXLAN or GENEVE. | |
370 | */ | |
371 | NAPI_GRO_CB(skb)->encap_mark = 0; | |
372 | ||
a0ca153f AD |
373 | /* Flag this frame as already having an outer encap header */ |
374 | NAPI_GRO_CB(skb)->is_fou = 1; | |
375 | ||
5024c33a TH |
376 | rcu_read_lock(); |
377 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
378 | ops = rcu_dereference(offloads[guehdr->proto_ctype]); | |
27013661 | 379 | if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive)) |
5024c33a | 380 | goto out_unlock; |
37dd0247 TH |
381 | |
382 | pp = ops->callbacks.gro_receive(head, skb); | |
c194cf93 | 383 | flush = 0; |
37dd0247 TH |
384 | |
385 | out_unlock: | |
386 | rcu_read_unlock(); | |
387 | out: | |
388 | NAPI_GRO_CB(skb)->flush |= flush; | |
26c4f7da | 389 | skb_gro_remcsum_cleanup(skb, &grc); |
37dd0247 TH |
390 | |
391 | return pp; | |
392 | } | |
393 | ||
d92283e3 | 394 | static int gue_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) |
37dd0247 TH |
395 | { |
396 | const struct net_offload **offloads; | |
397 | struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff); | |
398 | const struct net_offload *ops; | |
399 | unsigned int guehlen; | |
400 | u8 proto; | |
401 | int err = -ENOENT; | |
402 | ||
5024c33a | 403 | proto = guehdr->proto_ctype; |
37dd0247 TH |
404 | |
405 | guehlen = sizeof(*guehdr) + (guehdr->hlen << 2); | |
406 | ||
407 | rcu_read_lock(); | |
408 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
409 | ops = rcu_dereference(offloads[proto]); | |
410 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
411 | goto out_unlock; | |
412 | ||
413 | err = ops->callbacks.gro_complete(skb, nhoff + guehlen); | |
414 | ||
229740c6 JR |
415 | skb_set_inner_mac_header(skb, nhoff + guehlen); |
416 | ||
37dd0247 TH |
417 | out_unlock: |
418 | rcu_read_unlock(); | |
419 | return err; | |
420 | } | |
421 | ||
02d793c5 | 422 | static int fou_add_to_port_list(struct net *net, struct fou *fou) |
23461551 | 423 | { |
02d793c5 | 424 | struct fou_net *fn = net_generic(net, fou_net_id); |
23461551 TH |
425 | struct fou *fout; |
426 | ||
02d793c5 WC |
427 | mutex_lock(&fn->fou_lock); |
428 | list_for_each_entry(fout, &fn->fou_list, list) { | |
23461551 | 429 | if (fou->port == fout->port) { |
02d793c5 | 430 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
431 | return -EALREADY; |
432 | } | |
433 | } | |
434 | ||
02d793c5 WC |
435 | list_add(&fou->list, &fn->fou_list); |
436 | mutex_unlock(&fn->fou_lock); | |
23461551 TH |
437 | |
438 | return 0; | |
439 | } | |
440 | ||
441 | static void fou_release(struct fou *fou) | |
442 | { | |
443 | struct socket *sock = fou->sock; | |
23461551 | 444 | |
23461551 | 445 | list_del(&fou->list); |
02d793c5 | 446 | udp_tunnel_sock_release(sock); |
23461551 | 447 | |
3036facb | 448 | kfree_rcu(fou, rcu); |
23461551 TH |
449 | } |
450 | ||
451 | static int fou_create(struct net *net, struct fou_cfg *cfg, | |
452 | struct socket **sockp) | |
453 | { | |
23461551 | 454 | struct socket *sock = NULL; |
02d793c5 | 455 | struct fou *fou = NULL; |
23461551 | 456 | struct sock *sk; |
440924bb | 457 | struct udp_tunnel_sock_cfg tunnel_cfg; |
02d793c5 | 458 | int err; |
23461551 TH |
459 | |
460 | /* Open UDP socket */ | |
461 | err = udp_sock_create(net, &cfg->udp_config, &sock); | |
462 | if (err < 0) | |
463 | goto error; | |
464 | ||
465 | /* Allocate FOU port structure */ | |
466 | fou = kzalloc(sizeof(*fou), GFP_KERNEL); | |
467 | if (!fou) { | |
468 | err = -ENOMEM; | |
469 | goto error; | |
470 | } | |
471 | ||
472 | sk = sock->sk; | |
473 | ||
fe881ef1 | 474 | fou->flags = cfg->flags; |
37dd0247 | 475 | fou->port = cfg->udp_config.local_udp_port; |
440924bb TH |
476 | fou->type = cfg->type; |
477 | fou->sock = sock; | |
478 | ||
479 | memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); | |
480 | tunnel_cfg.encap_type = 1; | |
481 | tunnel_cfg.sk_user_data = fou; | |
482 | tunnel_cfg.encap_destroy = NULL; | |
37dd0247 TH |
483 | |
484 | /* Initial for fou type */ | |
485 | switch (cfg->type) { | |
486 | case FOU_ENCAP_DIRECT: | |
440924bb TH |
487 | tunnel_cfg.encap_rcv = fou_udp_recv; |
488 | tunnel_cfg.gro_receive = fou_gro_receive; | |
489 | tunnel_cfg.gro_complete = fou_gro_complete; | |
490 | fou->protocol = cfg->protocol; | |
37dd0247 TH |
491 | break; |
492 | case FOU_ENCAP_GUE: | |
440924bb TH |
493 | tunnel_cfg.encap_rcv = gue_udp_recv; |
494 | tunnel_cfg.gro_receive = gue_gro_receive; | |
495 | tunnel_cfg.gro_complete = gue_gro_complete; | |
37dd0247 TH |
496 | break; |
497 | default: | |
498 | err = -EINVAL; | |
499 | goto error; | |
500 | } | |
23461551 | 501 | |
440924bb | 502 | setup_udp_tunnel_sock(net, sock, &tunnel_cfg); |
23461551 TH |
503 | |
504 | sk->sk_allocation = GFP_ATOMIC; | |
505 | ||
02d793c5 | 506 | err = fou_add_to_port_list(net, fou); |
23461551 TH |
507 | if (err) |
508 | goto error; | |
509 | ||
510 | if (sockp) | |
511 | *sockp = sock; | |
512 | ||
513 | return 0; | |
514 | ||
515 | error: | |
516 | kfree(fou); | |
517 | if (sock) | |
02d793c5 | 518 | udp_tunnel_sock_release(sock); |
23461551 TH |
519 | |
520 | return err; | |
521 | } | |
522 | ||
523 | static int fou_destroy(struct net *net, struct fou_cfg *cfg) | |
524 | { | |
02d793c5 | 525 | struct fou_net *fn = net_generic(net, fou_net_id); |
4cbcdf2b | 526 | __be16 port = cfg->udp_config.local_udp_port; |
23461551 | 527 | int err = -EINVAL; |
02d793c5 | 528 | struct fou *fou; |
23461551 | 529 | |
02d793c5 WC |
530 | mutex_lock(&fn->fou_lock); |
531 | list_for_each_entry(fou, &fn->fou_list, list) { | |
23461551 TH |
532 | if (fou->port == port) { |
533 | fou_release(fou); | |
534 | err = 0; | |
535 | break; | |
536 | } | |
537 | } | |
02d793c5 | 538 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
539 | |
540 | return err; | |
541 | } | |
542 | ||
543 | static struct genl_family fou_nl_family = { | |
544 | .id = GENL_ID_GENERATE, | |
545 | .hdrsize = 0, | |
546 | .name = FOU_GENL_NAME, | |
547 | .version = FOU_GENL_VERSION, | |
548 | .maxattr = FOU_ATTR_MAX, | |
549 | .netnsok = true, | |
550 | }; | |
551 | ||
552 | static struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = { | |
553 | [FOU_ATTR_PORT] = { .type = NLA_U16, }, | |
554 | [FOU_ATTR_AF] = { .type = NLA_U8, }, | |
555 | [FOU_ATTR_IPPROTO] = { .type = NLA_U8, }, | |
37dd0247 | 556 | [FOU_ATTR_TYPE] = { .type = NLA_U8, }, |
fe881ef1 | 557 | [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, }, |
23461551 TH |
558 | }; |
559 | ||
560 | static int parse_nl_config(struct genl_info *info, | |
561 | struct fou_cfg *cfg) | |
562 | { | |
563 | memset(cfg, 0, sizeof(*cfg)); | |
564 | ||
565 | cfg->udp_config.family = AF_INET; | |
566 | ||
567 | if (info->attrs[FOU_ATTR_AF]) { | |
568 | u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]); | |
569 | ||
b9b6695c | 570 | if (family != AF_INET) |
23461551 TH |
571 | return -EINVAL; |
572 | ||
573 | cfg->udp_config.family = family; | |
574 | } | |
575 | ||
576 | if (info->attrs[FOU_ATTR_PORT]) { | |
4cbcdf2b | 577 | __be16 port = nla_get_be16(info->attrs[FOU_ATTR_PORT]); |
23461551 TH |
578 | |
579 | cfg->udp_config.local_udp_port = port; | |
580 | } | |
581 | ||
582 | if (info->attrs[FOU_ATTR_IPPROTO]) | |
583 | cfg->protocol = nla_get_u8(info->attrs[FOU_ATTR_IPPROTO]); | |
584 | ||
37dd0247 TH |
585 | if (info->attrs[FOU_ATTR_TYPE]) |
586 | cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]); | |
587 | ||
fe881ef1 TH |
588 | if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL]) |
589 | cfg->flags |= FOU_F_REMCSUM_NOPARTIAL; | |
590 | ||
23461551 TH |
591 | return 0; |
592 | } | |
593 | ||
594 | static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info) | |
595 | { | |
02d793c5 | 596 | struct net *net = genl_info_net(info); |
23461551 TH |
597 | struct fou_cfg cfg; |
598 | int err; | |
599 | ||
600 | err = parse_nl_config(info, &cfg); | |
601 | if (err) | |
602 | return err; | |
603 | ||
02d793c5 | 604 | return fou_create(net, &cfg, NULL); |
23461551 TH |
605 | } |
606 | ||
607 | static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info) | |
608 | { | |
02d793c5 | 609 | struct net *net = genl_info_net(info); |
23461551 | 610 | struct fou_cfg cfg; |
67270636 | 611 | int err; |
23461551 | 612 | |
67270636 WC |
613 | err = parse_nl_config(info, &cfg); |
614 | if (err) | |
615 | return err; | |
23461551 | 616 | |
02d793c5 | 617 | return fou_destroy(net, &cfg); |
23461551 TH |
618 | } |
619 | ||
7a6c8c34 WC |
620 | static int fou_fill_info(struct fou *fou, struct sk_buff *msg) |
621 | { | |
622 | if (nla_put_u8(msg, FOU_ATTR_AF, fou->sock->sk->sk_family) || | |
623 | nla_put_be16(msg, FOU_ATTR_PORT, fou->port) || | |
624 | nla_put_u8(msg, FOU_ATTR_IPPROTO, fou->protocol) || | |
625 | nla_put_u8(msg, FOU_ATTR_TYPE, fou->type)) | |
626 | return -1; | |
627 | ||
628 | if (fou->flags & FOU_F_REMCSUM_NOPARTIAL) | |
629 | if (nla_put_flag(msg, FOU_ATTR_REMCSUM_NOPARTIAL)) | |
630 | return -1; | |
631 | return 0; | |
632 | } | |
633 | ||
634 | static int fou_dump_info(struct fou *fou, u32 portid, u32 seq, | |
635 | u32 flags, struct sk_buff *skb, u8 cmd) | |
636 | { | |
637 | void *hdr; | |
638 | ||
639 | hdr = genlmsg_put(skb, portid, seq, &fou_nl_family, flags, cmd); | |
640 | if (!hdr) | |
641 | return -ENOMEM; | |
642 | ||
643 | if (fou_fill_info(fou, skb) < 0) | |
644 | goto nla_put_failure; | |
645 | ||
646 | genlmsg_end(skb, hdr); | |
647 | return 0; | |
648 | ||
649 | nla_put_failure: | |
650 | genlmsg_cancel(skb, hdr); | |
651 | return -EMSGSIZE; | |
652 | } | |
653 | ||
654 | static int fou_nl_cmd_get_port(struct sk_buff *skb, struct genl_info *info) | |
655 | { | |
656 | struct net *net = genl_info_net(info); | |
657 | struct fou_net *fn = net_generic(net, fou_net_id); | |
658 | struct sk_buff *msg; | |
659 | struct fou_cfg cfg; | |
660 | struct fou *fout; | |
661 | __be16 port; | |
662 | int ret; | |
663 | ||
664 | ret = parse_nl_config(info, &cfg); | |
665 | if (ret) | |
666 | return ret; | |
667 | port = cfg.udp_config.local_udp_port; | |
668 | if (port == 0) | |
669 | return -EINVAL; | |
670 | ||
671 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
672 | if (!msg) | |
673 | return -ENOMEM; | |
674 | ||
675 | ret = -ESRCH; | |
676 | mutex_lock(&fn->fou_lock); | |
677 | list_for_each_entry(fout, &fn->fou_list, list) { | |
678 | if (port == fout->port) { | |
679 | ret = fou_dump_info(fout, info->snd_portid, | |
680 | info->snd_seq, 0, msg, | |
681 | info->genlhdr->cmd); | |
682 | break; | |
683 | } | |
684 | } | |
685 | mutex_unlock(&fn->fou_lock); | |
686 | if (ret < 0) | |
687 | goto out_free; | |
688 | ||
689 | return genlmsg_reply(msg, info); | |
690 | ||
691 | out_free: | |
692 | nlmsg_free(msg); | |
693 | return ret; | |
694 | } | |
695 | ||
696 | static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
697 | { | |
698 | struct net *net = sock_net(skb->sk); | |
699 | struct fou_net *fn = net_generic(net, fou_net_id); | |
700 | struct fou *fout; | |
701 | int idx = 0, ret; | |
702 | ||
703 | mutex_lock(&fn->fou_lock); | |
704 | list_for_each_entry(fout, &fn->fou_list, list) { | |
705 | if (idx++ < cb->args[0]) | |
706 | continue; | |
707 | ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid, | |
708 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
709 | skb, FOU_CMD_GET); | |
710 | if (ret) | |
540207ae | 711 | break; |
7a6c8c34 WC |
712 | } |
713 | mutex_unlock(&fn->fou_lock); | |
714 | ||
7a6c8c34 WC |
715 | cb->args[0] = idx; |
716 | return skb->len; | |
717 | } | |
718 | ||
23461551 TH |
719 | static const struct genl_ops fou_nl_ops[] = { |
720 | { | |
721 | .cmd = FOU_CMD_ADD, | |
722 | .doit = fou_nl_cmd_add_port, | |
723 | .policy = fou_nl_policy, | |
724 | .flags = GENL_ADMIN_PERM, | |
725 | }, | |
726 | { | |
727 | .cmd = FOU_CMD_DEL, | |
728 | .doit = fou_nl_cmd_rm_port, | |
729 | .policy = fou_nl_policy, | |
730 | .flags = GENL_ADMIN_PERM, | |
731 | }, | |
7a6c8c34 WC |
732 | { |
733 | .cmd = FOU_CMD_GET, | |
734 | .doit = fou_nl_cmd_get_port, | |
735 | .dumpit = fou_nl_dump, | |
736 | .policy = fou_nl_policy, | |
737 | }, | |
23461551 TH |
738 | }; |
739 | ||
a8c5f90f TH |
740 | size_t fou_encap_hlen(struct ip_tunnel_encap *e) |
741 | { | |
742 | return sizeof(struct udphdr); | |
743 | } | |
744 | EXPORT_SYMBOL(fou_encap_hlen); | |
745 | ||
746 | size_t gue_encap_hlen(struct ip_tunnel_encap *e) | |
747 | { | |
748 | size_t len; | |
749 | bool need_priv = false; | |
750 | ||
751 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
752 | ||
753 | if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) { | |
754 | len += GUE_PLEN_REMCSUM; | |
755 | need_priv = true; | |
756 | } | |
757 | ||
758 | len += need_priv ? GUE_LEN_PRIV : 0; | |
759 | ||
760 | return len; | |
761 | } | |
762 | EXPORT_SYMBOL(gue_encap_hlen); | |
763 | ||
63487bab TH |
764 | static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e, |
765 | struct flowi4 *fl4, u8 *protocol, __be16 sport) | |
766 | { | |
767 | struct udphdr *uh; | |
768 | ||
769 | skb_push(skb, sizeof(struct udphdr)); | |
770 | skb_reset_transport_header(skb); | |
771 | ||
772 | uh = udp_hdr(skb); | |
773 | ||
774 | uh->dest = e->dport; | |
775 | uh->source = sport; | |
776 | uh->len = htons(skb->len); | |
63487bab TH |
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 | ||
dc969b81 TH |
783 | int __fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, |
784 | u8 *protocol, __be16 *sport, int type) | |
785 | { | |
786 | int err; | |
787 | ||
788 | err = iptunnel_handle_offloads(skb, type); | |
789 | if (err) | |
790 | return err; | |
791 | ||
792 | *sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
793 | skb, 0, 0, false); | |
794 | ||
795 | return 0; | |
796 | } | |
797 | EXPORT_SYMBOL(__fou_build_header); | |
798 | ||
63487bab TH |
799 | int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, |
800 | u8 *protocol, struct flowi4 *fl4) | |
801 | { | |
06f62292 EC |
802 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM : |
803 | SKB_GSO_UDP_TUNNEL; | |
63487bab | 804 | __be16 sport; |
aed069df | 805 | int err; |
63487bab | 806 | |
dc969b81 | 807 | err = __fou_build_header(skb, e, protocol, &sport, type); |
aed069df AD |
808 | if (err) |
809 | return err; | |
63487bab | 810 | |
63487bab TH |
811 | fou_build_udp(skb, e, fl4, protocol, sport); |
812 | ||
813 | return 0; | |
814 | } | |
815 | EXPORT_SYMBOL(fou_build_header); | |
816 | ||
dc969b81 TH |
817 | int __gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, |
818 | u8 *protocol, __be16 *sport, int type) | |
63487bab | 819 | { |
63487bab | 820 | struct guehdr *guehdr; |
b17f709a | 821 | size_t hdrlen, optlen = 0; |
5024c33a TH |
822 | void *data; |
823 | bool need_priv = false; | |
aed069df | 824 | int err; |
5024c33a | 825 | |
b17f709a TH |
826 | if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) && |
827 | skb->ip_summed == CHECKSUM_PARTIAL) { | |
b17f709a TH |
828 | optlen += GUE_PLEN_REMCSUM; |
829 | type |= SKB_GSO_TUNNEL_REMCSUM; | |
830 | need_priv = true; | |
831 | } | |
832 | ||
5024c33a | 833 | optlen += need_priv ? GUE_LEN_PRIV : 0; |
63487bab | 834 | |
aed069df AD |
835 | err = iptunnel_handle_offloads(skb, type); |
836 | if (err) | |
837 | return err; | |
63487bab TH |
838 | |
839 | /* Get source port (based on flow hash) before skb_push */ | |
dc969b81 TH |
840 | *sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), |
841 | skb, 0, 0, false); | |
63487bab | 842 | |
b17f709a TH |
843 | hdrlen = sizeof(struct guehdr) + optlen; |
844 | ||
845 | skb_push(skb, hdrlen); | |
63487bab TH |
846 | |
847 | guehdr = (struct guehdr *)skb->data; | |
848 | ||
5024c33a | 849 | guehdr->control = 0; |
63487bab | 850 | guehdr->version = 0; |
5024c33a | 851 | guehdr->hlen = optlen >> 2; |
63487bab | 852 | guehdr->flags = 0; |
5024c33a TH |
853 | guehdr->proto_ctype = *protocol; |
854 | ||
855 | data = &guehdr[1]; | |
856 | ||
857 | if (need_priv) { | |
858 | __be32 *flags = data; | |
859 | ||
860 | guehdr->flags |= GUE_FLAG_PRIV; | |
861 | *flags = 0; | |
862 | data += GUE_LEN_PRIV; | |
863 | ||
b17f709a TH |
864 | if (type & SKB_GSO_TUNNEL_REMCSUM) { |
865 | u16 csum_start = skb_checksum_start_offset(skb); | |
866 | __be16 *pd = data; | |
867 | ||
868 | if (csum_start < hdrlen) | |
869 | return -EINVAL; | |
870 | ||
871 | csum_start -= hdrlen; | |
872 | pd[0] = htons(csum_start); | |
873 | pd[1] = htons(csum_start + skb->csum_offset); | |
874 | ||
875 | if (!skb_is_gso(skb)) { | |
876 | skb->ip_summed = CHECKSUM_NONE; | |
877 | skb->encapsulation = 0; | |
878 | } | |
879 | ||
880 | *flags |= GUE_PFLAG_REMCSUM; | |
881 | data += GUE_PLEN_REMCSUM; | |
882 | } | |
883 | ||
5024c33a | 884 | } |
63487bab | 885 | |
dc969b81 TH |
886 | return 0; |
887 | } | |
888 | EXPORT_SYMBOL(__gue_build_header); | |
889 | ||
890 | int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
891 | u8 *protocol, struct flowi4 *fl4) | |
892 | { | |
893 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM : | |
894 | SKB_GSO_UDP_TUNNEL; | |
895 | __be16 sport; | |
896 | int err; | |
897 | ||
898 | err = __gue_build_header(skb, e, protocol, &sport, type); | |
899 | if (err) | |
900 | return err; | |
901 | ||
63487bab TH |
902 | fou_build_udp(skb, e, fl4, protocol, sport); |
903 | ||
904 | return 0; | |
905 | } | |
906 | EXPORT_SYMBOL(gue_build_header); | |
907 | ||
a8c5f90f TH |
908 | #ifdef CONFIG_NET_FOU_IP_TUNNELS |
909 | ||
5eeb2922 | 910 | static const struct ip_tunnel_encap_ops fou_iptun_ops = { |
a8c5f90f TH |
911 | .encap_hlen = fou_encap_hlen, |
912 | .build_header = fou_build_header, | |
913 | }; | |
914 | ||
5eeb2922 | 915 | static const struct ip_tunnel_encap_ops gue_iptun_ops = { |
a8c5f90f TH |
916 | .encap_hlen = gue_encap_hlen, |
917 | .build_header = gue_build_header, | |
918 | }; | |
919 | ||
920 | static int ip_tunnel_encap_add_fou_ops(void) | |
921 | { | |
922 | int ret; | |
923 | ||
924 | ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
925 | if (ret < 0) { | |
926 | pr_err("can't add fou ops\n"); | |
927 | return ret; | |
928 | } | |
929 | ||
930 | ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
931 | if (ret < 0) { | |
932 | pr_err("can't add gue ops\n"); | |
933 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
934 | return ret; | |
935 | } | |
936 | ||
937 | return 0; | |
938 | } | |
939 | ||
940 | static void ip_tunnel_encap_del_fou_ops(void) | |
941 | { | |
942 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
943 | ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
944 | } | |
945 | ||
946 | #else | |
947 | ||
948 | static int ip_tunnel_encap_add_fou_ops(void) | |
949 | { | |
950 | return 0; | |
951 | } | |
952 | ||
882288c0 | 953 | static void ip_tunnel_encap_del_fou_ops(void) |
a8c5f90f TH |
954 | { |
955 | } | |
956 | ||
957 | #endif | |
958 | ||
02d793c5 WC |
959 | static __net_init int fou_init_net(struct net *net) |
960 | { | |
961 | struct fou_net *fn = net_generic(net, fou_net_id); | |
962 | ||
963 | INIT_LIST_HEAD(&fn->fou_list); | |
964 | mutex_init(&fn->fou_lock); | |
965 | return 0; | |
966 | } | |
967 | ||
968 | static __net_exit void fou_exit_net(struct net *net) | |
969 | { | |
970 | struct fou_net *fn = net_generic(net, fou_net_id); | |
971 | struct fou *fou, *next; | |
972 | ||
973 | /* Close all the FOU sockets */ | |
974 | mutex_lock(&fn->fou_lock); | |
975 | list_for_each_entry_safe(fou, next, &fn->fou_list, list) | |
976 | fou_release(fou); | |
977 | mutex_unlock(&fn->fou_lock); | |
978 | } | |
979 | ||
980 | static struct pernet_operations fou_net_ops = { | |
981 | .init = fou_init_net, | |
982 | .exit = fou_exit_net, | |
983 | .id = &fou_net_id, | |
984 | .size = sizeof(struct fou_net), | |
985 | }; | |
986 | ||
23461551 TH |
987 | static int __init fou_init(void) |
988 | { | |
989 | int ret; | |
990 | ||
02d793c5 WC |
991 | ret = register_pernet_device(&fou_net_ops); |
992 | if (ret) | |
993 | goto exit; | |
994 | ||
23461551 TH |
995 | ret = genl_register_family_with_ops(&fou_nl_family, |
996 | fou_nl_ops); | |
a8c5f90f | 997 | if (ret < 0) |
02d793c5 | 998 | goto unregister; |
a8c5f90f TH |
999 | |
1000 | ret = ip_tunnel_encap_add_fou_ops(); | |
02d793c5 WC |
1001 | if (ret == 0) |
1002 | return 0; | |
a8c5f90f | 1003 | |
02d793c5 WC |
1004 | genl_unregister_family(&fou_nl_family); |
1005 | unregister: | |
1006 | unregister_pernet_device(&fou_net_ops); | |
a8c5f90f | 1007 | exit: |
23461551 TH |
1008 | return ret; |
1009 | } | |
1010 | ||
1011 | static void __exit fou_fini(void) | |
1012 | { | |
a8c5f90f | 1013 | ip_tunnel_encap_del_fou_ops(); |
23461551 | 1014 | genl_unregister_family(&fou_nl_family); |
02d793c5 | 1015 | unregister_pernet_device(&fou_net_ops); |
23461551 TH |
1016 | } |
1017 | ||
1018 | module_init(fou_init); | |
1019 | module_exit(fou_fini); | |
1020 | MODULE_AUTHOR("Tom Herbert <therbert@google.com>"); | |
1021 | MODULE_LICENSE("GPL"); |