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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 | 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 | ||
a09a4c8d | 51 | static int fou_recv_pull(struct sk_buff *skb, size_t len) |
23461551 TH |
52 | { |
53 | struct iphdr *iph = ip_hdr(skb); | |
54 | ||
55 | /* Remove 'len' bytes from the packet (UDP header and | |
5024c33a | 56 | * FOU header if present). |
23461551 TH |
57 | */ |
58 | iph->tot_len = htons(ntohs(iph->tot_len) - len); | |
59 | __skb_pull(skb, len); | |
60 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
61 | skb_reset_transport_header(skb); | |
a09a4c8d | 62 | return iptunnel_pull_offloads(skb); |
23461551 TH |
63 | } |
64 | ||
65 | static int fou_udp_recv(struct sock *sk, struct sk_buff *skb) | |
66 | { | |
67 | struct fou *fou = fou_from_sock(sk); | |
68 | ||
69 | if (!fou) | |
70 | return 1; | |
71 | ||
a09a4c8d JG |
72 | if (fou_recv_pull(skb, sizeof(struct udphdr))) |
73 | goto drop; | |
5024c33a TH |
74 | |
75 | return -fou->protocol; | |
a09a4c8d JG |
76 | |
77 | drop: | |
78 | kfree_skb(skb); | |
79 | return 0; | |
5024c33a TH |
80 | } |
81 | ||
a8d31c12 | 82 | static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr, |
fe881ef1 TH |
83 | void *data, size_t hdrlen, u8 ipproto, |
84 | bool nopartial) | |
a8d31c12 TH |
85 | { |
86 | __be16 *pd = data; | |
4fd671de TH |
87 | size_t start = ntohs(pd[0]); |
88 | size_t offset = ntohs(pd[1]); | |
b7fe10e5 TH |
89 | size_t plen = sizeof(struct udphdr) + hdrlen + |
90 | max_t(size_t, offset + sizeof(u16), start); | |
91 | ||
92 | if (skb->remcsum_offload) | |
93 | return guehdr; | |
a8d31c12 | 94 | |
a8d31c12 TH |
95 | if (!pskb_may_pull(skb, plen)) |
96 | return NULL; | |
97 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
98 | ||
fe881ef1 TH |
99 | skb_remcsum_process(skb, (void *)guehdr + hdrlen, |
100 | start, offset, nopartial); | |
a8d31c12 TH |
101 | |
102 | return guehdr; | |
103 | } | |
104 | ||
5024c33a TH |
105 | static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr) |
106 | { | |
107 | /* No support yet */ | |
108 | kfree_skb(skb); | |
109 | return 0; | |
23461551 TH |
110 | } |
111 | ||
37dd0247 TH |
112 | static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) |
113 | { | |
114 | struct fou *fou = fou_from_sock(sk); | |
5024c33a | 115 | size_t len, optlen, hdrlen; |
37dd0247 | 116 | struct guehdr *guehdr; |
5024c33a | 117 | void *data; |
a8d31c12 | 118 | u16 doffset = 0; |
37dd0247 TH |
119 | |
120 | if (!fou) | |
121 | return 1; | |
122 | ||
123 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
124 | if (!pskb_may_pull(skb, len)) | |
125 | goto drop; | |
126 | ||
5024c33a TH |
127 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; |
128 | ||
129 | optlen = guehdr->hlen << 2; | |
130 | len += optlen; | |
37dd0247 | 131 | |
37dd0247 TH |
132 | if (!pskb_may_pull(skb, len)) |
133 | goto drop; | |
134 | ||
5024c33a TH |
135 | /* guehdr may change after pull */ |
136 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
d8f00d27 | 137 | |
5024c33a | 138 | hdrlen = sizeof(struct guehdr) + optlen; |
37dd0247 | 139 | |
5024c33a | 140 | if (guehdr->version != 0 || validate_gue_flags(guehdr, optlen)) |
37dd0247 | 141 | goto drop; |
5024c33a | 142 | |
a8d31c12 TH |
143 | hdrlen = sizeof(struct guehdr) + optlen; |
144 | ||
145 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len); | |
146 | ||
a8d31c12 TH |
147 | /* Pull csum through the guehdr now . This can be used if |
148 | * there is a remote checksum offload. | |
149 | */ | |
150 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
5024c33a TH |
151 | |
152 | data = &guehdr[1]; | |
153 | ||
154 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 TH |
155 | __be32 flags = *(__be32 *)(data + doffset); |
156 | ||
157 | doffset += GUE_LEN_PRIV; | |
158 | ||
159 | if (flags & GUE_PFLAG_REMCSUM) { | |
160 | guehdr = gue_remcsum(skb, guehdr, data + doffset, | |
fe881ef1 TH |
161 | hdrlen, guehdr->proto_ctype, |
162 | !!(fou->flags & | |
163 | FOU_F_REMCSUM_NOPARTIAL)); | |
a8d31c12 TH |
164 | if (!guehdr) |
165 | goto drop; | |
166 | ||
167 | data = &guehdr[1]; | |
5024c33a | 168 | |
a8d31c12 TH |
169 | doffset += GUE_PLEN_REMCSUM; |
170 | } | |
37dd0247 TH |
171 | } |
172 | ||
5024c33a TH |
173 | if (unlikely(guehdr->control)) |
174 | return gue_control_message(skb, guehdr); | |
175 | ||
4fd671de | 176 | __skb_pull(skb, sizeof(struct udphdr) + hdrlen); |
a8d31c12 TH |
177 | skb_reset_transport_header(skb); |
178 | ||
a09a4c8d JG |
179 | if (iptunnel_pull_offloads(skb)) |
180 | goto drop; | |
181 | ||
5024c33a TH |
182 | return -guehdr->proto_ctype; |
183 | ||
37dd0247 TH |
184 | drop: |
185 | kfree_skb(skb); | |
186 | return 0; | |
187 | } | |
188 | ||
afe93325 | 189 | static struct sk_buff **fou_gro_receive(struct sk_buff **head, |
a2b12f3c TH |
190 | struct sk_buff *skb, |
191 | struct udp_offload *uoff) | |
afe93325 TH |
192 | { |
193 | const struct net_offload *ops; | |
194 | struct sk_buff **pp = NULL; | |
195 | u8 proto = NAPI_GRO_CB(skb)->proto; | |
efc98d08 | 196 | const struct net_offload **offloads; |
afe93325 | 197 | |
c3483384 AD |
198 | /* We can clear the encap_mark for FOU as we are essentially doing |
199 | * one of two possible things. We are either adding an L4 tunnel | |
200 | * header to the outer L3 tunnel header, or we are are simply | |
201 | * treating the GRE tunnel header as though it is a UDP protocol | |
202 | * specific header such as VXLAN or GENEVE. | |
203 | */ | |
204 | NAPI_GRO_CB(skb)->encap_mark = 0; | |
205 | ||
a0ca153f AD |
206 | /* Flag this frame as already having an outer encap header */ |
207 | NAPI_GRO_CB(skb)->is_fou = 1; | |
208 | ||
afe93325 | 209 | rcu_read_lock(); |
efc98d08 | 210 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
211 | ops = rcu_dereference(offloads[proto]); |
212 | if (!ops || !ops->callbacks.gro_receive) | |
213 | goto out_unlock; | |
214 | ||
215 | pp = ops->callbacks.gro_receive(head, skb); | |
216 | ||
217 | out_unlock: | |
218 | rcu_read_unlock(); | |
219 | ||
220 | return pp; | |
221 | } | |
222 | ||
a2b12f3c TH |
223 | static int fou_gro_complete(struct sk_buff *skb, int nhoff, |
224 | struct udp_offload *uoff) | |
afe93325 TH |
225 | { |
226 | const struct net_offload *ops; | |
227 | u8 proto = NAPI_GRO_CB(skb)->proto; | |
228 | int err = -ENOSYS; | |
efc98d08 | 229 | const struct net_offload **offloads; |
afe93325 TH |
230 | |
231 | rcu_read_lock(); | |
efc98d08 | 232 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
233 | ops = rcu_dereference(offloads[proto]); |
234 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
235 | goto out_unlock; | |
236 | ||
237 | err = ops->callbacks.gro_complete(skb, nhoff); | |
238 | ||
239 | out_unlock: | |
240 | rcu_read_unlock(); | |
241 | ||
242 | return err; | |
243 | } | |
244 | ||
a8d31c12 TH |
245 | static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, |
246 | struct guehdr *guehdr, void *data, | |
b7fe10e5 TH |
247 | size_t hdrlen, struct gro_remcsum *grc, |
248 | bool nopartial) | |
a8d31c12 TH |
249 | { |
250 | __be16 *pd = data; | |
4fd671de TH |
251 | size_t start = ntohs(pd[0]); |
252 | size_t offset = ntohs(pd[1]); | |
a8d31c12 TH |
253 | |
254 | if (skb->remcsum_offload) | |
b7fe10e5 | 255 | return guehdr; |
a8d31c12 | 256 | |
4fd671de | 257 | if (!NAPI_GRO_CB(skb)->csum_valid) |
a8d31c12 TH |
258 | return NULL; |
259 | ||
b7fe10e5 TH |
260 | guehdr = skb_gro_remcsum_process(skb, (void *)guehdr, off, hdrlen, |
261 | start, offset, grc, nopartial); | |
a8d31c12 TH |
262 | |
263 | skb->remcsum_offload = 1; | |
264 | ||
265 | return guehdr; | |
266 | } | |
267 | ||
37dd0247 | 268 | static struct sk_buff **gue_gro_receive(struct sk_buff **head, |
a2b12f3c TH |
269 | struct sk_buff *skb, |
270 | struct udp_offload *uoff) | |
37dd0247 TH |
271 | { |
272 | const struct net_offload **offloads; | |
273 | const struct net_offload *ops; | |
274 | struct sk_buff **pp = NULL; | |
275 | struct sk_buff *p; | |
37dd0247 | 276 | struct guehdr *guehdr; |
5024c33a TH |
277 | size_t len, optlen, hdrlen, off; |
278 | void *data; | |
a8d31c12 | 279 | u16 doffset = 0; |
37dd0247 | 280 | int flush = 1; |
fe881ef1 | 281 | struct fou *fou = container_of(uoff, struct fou, udp_offloads); |
26c4f7da TH |
282 | struct gro_remcsum grc; |
283 | ||
284 | skb_gro_remcsum_init(&grc); | |
37dd0247 TH |
285 | |
286 | off = skb_gro_offset(skb); | |
5024c33a TH |
287 | len = off + sizeof(*guehdr); |
288 | ||
37dd0247 | 289 | guehdr = skb_gro_header_fast(skb, off); |
5024c33a TH |
290 | if (skb_gro_header_hard(skb, len)) { |
291 | guehdr = skb_gro_header_slow(skb, len, off); | |
37dd0247 TH |
292 | if (unlikely(!guehdr)) |
293 | goto out; | |
294 | } | |
295 | ||
5024c33a TH |
296 | optlen = guehdr->hlen << 2; |
297 | len += optlen; | |
37dd0247 | 298 | |
5024c33a TH |
299 | if (skb_gro_header_hard(skb, len)) { |
300 | guehdr = skb_gro_header_slow(skb, len, off); | |
301 | if (unlikely(!guehdr)) | |
302 | goto out; | |
303 | } | |
37dd0247 | 304 | |
5024c33a TH |
305 | if (unlikely(guehdr->control) || guehdr->version != 0 || |
306 | validate_gue_flags(guehdr, optlen)) | |
307 | goto out; | |
37dd0247 | 308 | |
5024c33a TH |
309 | hdrlen = sizeof(*guehdr) + optlen; |
310 | ||
a8d31c12 TH |
311 | /* Adjust NAPI_GRO_CB(skb)->csum to account for guehdr, |
312 | * this is needed if there is a remote checkcsum offload. | |
313 | */ | |
5024c33a TH |
314 | skb_gro_postpull_rcsum(skb, guehdr, hdrlen); |
315 | ||
316 | data = &guehdr[1]; | |
317 | ||
318 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 | 319 | __be32 flags = *(__be32 *)(data + doffset); |
5024c33a | 320 | |
a8d31c12 TH |
321 | doffset += GUE_LEN_PRIV; |
322 | ||
323 | if (flags & GUE_PFLAG_REMCSUM) { | |
324 | guehdr = gue_gro_remcsum(skb, off, guehdr, | |
b7fe10e5 | 325 | data + doffset, hdrlen, &grc, |
fe881ef1 TH |
326 | !!(fou->flags & |
327 | FOU_F_REMCSUM_NOPARTIAL)); | |
b7fe10e5 | 328 | |
a8d31c12 TH |
329 | if (!guehdr) |
330 | goto out; | |
331 | ||
332 | data = &guehdr[1]; | |
333 | ||
334 | doffset += GUE_PLEN_REMCSUM; | |
335 | } | |
37dd0247 TH |
336 | } |
337 | ||
a8d31c12 TH |
338 | skb_gro_pull(skb, hdrlen); |
339 | ||
37dd0247 TH |
340 | for (p = *head; p; p = p->next) { |
341 | const struct guehdr *guehdr2; | |
342 | ||
343 | if (!NAPI_GRO_CB(p)->same_flow) | |
344 | continue; | |
345 | ||
346 | guehdr2 = (struct guehdr *)(p->data + off); | |
347 | ||
348 | /* Compare base GUE header to be equal (covers | |
5024c33a | 349 | * hlen, version, proto_ctype, and flags. |
37dd0247 TH |
350 | */ |
351 | if (guehdr->word != guehdr2->word) { | |
352 | NAPI_GRO_CB(p)->same_flow = 0; | |
353 | continue; | |
354 | } | |
355 | ||
356 | /* Compare optional fields are the same. */ | |
357 | if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1], | |
358 | guehdr->hlen << 2)) { | |
359 | NAPI_GRO_CB(p)->same_flow = 0; | |
360 | continue; | |
361 | } | |
362 | } | |
363 | ||
c3483384 AD |
364 | /* We can clear the encap_mark for GUE as we are essentially doing |
365 | * one of two possible things. We are either adding an L4 tunnel | |
366 | * header to the outer L3 tunnel header, or we are are simply | |
367 | * treating the GRE tunnel header as though it is a UDP protocol | |
368 | * specific header such as VXLAN or GENEVE. | |
369 | */ | |
370 | NAPI_GRO_CB(skb)->encap_mark = 0; | |
371 | ||
a0ca153f AD |
372 | /* Flag this frame as already having an outer encap header */ |
373 | NAPI_GRO_CB(skb)->is_fou = 1; | |
374 | ||
5024c33a TH |
375 | rcu_read_lock(); |
376 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
377 | ops = rcu_dereference(offloads[guehdr->proto_ctype]); | |
27013661 | 378 | if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive)) |
5024c33a | 379 | goto out_unlock; |
37dd0247 TH |
380 | |
381 | pp = ops->callbacks.gro_receive(head, skb); | |
c194cf93 | 382 | flush = 0; |
37dd0247 TH |
383 | |
384 | out_unlock: | |
385 | rcu_read_unlock(); | |
386 | out: | |
387 | NAPI_GRO_CB(skb)->flush |= flush; | |
26c4f7da | 388 | skb_gro_remcsum_cleanup(skb, &grc); |
37dd0247 TH |
389 | |
390 | return pp; | |
391 | } | |
392 | ||
a2b12f3c TH |
393 | static int gue_gro_complete(struct sk_buff *skb, int nhoff, |
394 | struct udp_offload *uoff) | |
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 | ||
415 | out_unlock: | |
416 | rcu_read_unlock(); | |
417 | return err; | |
418 | } | |
419 | ||
02d793c5 | 420 | static int fou_add_to_port_list(struct net *net, struct fou *fou) |
23461551 | 421 | { |
02d793c5 | 422 | struct fou_net *fn = net_generic(net, fou_net_id); |
23461551 TH |
423 | struct fou *fout; |
424 | ||
02d793c5 WC |
425 | mutex_lock(&fn->fou_lock); |
426 | list_for_each_entry(fout, &fn->fou_list, list) { | |
23461551 | 427 | if (fou->port == fout->port) { |
02d793c5 | 428 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
429 | return -EALREADY; |
430 | } | |
431 | } | |
432 | ||
02d793c5 WC |
433 | list_add(&fou->list, &fn->fou_list); |
434 | mutex_unlock(&fn->fou_lock); | |
23461551 TH |
435 | |
436 | return 0; | |
437 | } | |
438 | ||
439 | static void fou_release(struct fou *fou) | |
440 | { | |
441 | struct socket *sock = fou->sock; | |
442 | struct sock *sk = sock->sk; | |
443 | ||
9272f048 WC |
444 | if (sk->sk_family == AF_INET) |
445 | udp_del_offload(&fou->udp_offloads); | |
23461551 | 446 | list_del(&fou->list); |
02d793c5 | 447 | udp_tunnel_sock_release(sock); |
23461551 | 448 | |
3036facb | 449 | kfree_rcu(fou, rcu); |
23461551 TH |
450 | } |
451 | ||
37dd0247 TH |
452 | static int fou_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) |
453 | { | |
454 | udp_sk(sk)->encap_rcv = fou_udp_recv; | |
455 | fou->protocol = cfg->protocol; | |
456 | fou->udp_offloads.callbacks.gro_receive = fou_gro_receive; | |
457 | fou->udp_offloads.callbacks.gro_complete = fou_gro_complete; | |
458 | fou->udp_offloads.port = cfg->udp_config.local_udp_port; | |
459 | fou->udp_offloads.ipproto = cfg->protocol; | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | static int gue_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) | |
465 | { | |
466 | udp_sk(sk)->encap_rcv = gue_udp_recv; | |
467 | fou->udp_offloads.callbacks.gro_receive = gue_gro_receive; | |
468 | fou->udp_offloads.callbacks.gro_complete = gue_gro_complete; | |
469 | fou->udp_offloads.port = cfg->udp_config.local_udp_port; | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
23461551 TH |
474 | static int fou_create(struct net *net, struct fou_cfg *cfg, |
475 | struct socket **sockp) | |
476 | { | |
23461551 | 477 | struct socket *sock = NULL; |
02d793c5 | 478 | struct fou *fou = NULL; |
23461551 | 479 | struct sock *sk; |
02d793c5 | 480 | int err; |
23461551 TH |
481 | |
482 | /* Open UDP socket */ | |
483 | err = udp_sock_create(net, &cfg->udp_config, &sock); | |
484 | if (err < 0) | |
485 | goto error; | |
486 | ||
487 | /* Allocate FOU port structure */ | |
488 | fou = kzalloc(sizeof(*fou), GFP_KERNEL); | |
489 | if (!fou) { | |
490 | err = -ENOMEM; | |
491 | goto error; | |
492 | } | |
493 | ||
494 | sk = sock->sk; | |
495 | ||
fe881ef1 | 496 | fou->flags = cfg->flags; |
37dd0247 TH |
497 | fou->port = cfg->udp_config.local_udp_port; |
498 | ||
499 | /* Initial for fou type */ | |
500 | switch (cfg->type) { | |
501 | case FOU_ENCAP_DIRECT: | |
502 | err = fou_encap_init(sk, fou, cfg); | |
503 | if (err) | |
504 | goto error; | |
505 | break; | |
506 | case FOU_ENCAP_GUE: | |
507 | err = gue_encap_init(sk, fou, cfg); | |
508 | if (err) | |
509 | goto error; | |
510 | break; | |
511 | default: | |
512 | err = -EINVAL; | |
513 | goto error; | |
514 | } | |
23461551 | 515 | |
7a6c8c34 WC |
516 | fou->type = cfg->type; |
517 | ||
23461551 TH |
518 | udp_sk(sk)->encap_type = 1; |
519 | udp_encap_enable(); | |
520 | ||
521 | sk->sk_user_data = fou; | |
522 | fou->sock = sock; | |
523 | ||
224d019c | 524 | inet_inc_convert_csum(sk); |
23461551 TH |
525 | |
526 | sk->sk_allocation = GFP_ATOMIC; | |
527 | ||
afe93325 | 528 | if (cfg->udp_config.family == AF_INET) { |
787d7ac3 | 529 | err = udp_add_offload(net, &fou->udp_offloads); |
afe93325 TH |
530 | if (err) |
531 | goto error; | |
532 | } | |
533 | ||
02d793c5 | 534 | err = fou_add_to_port_list(net, fou); |
23461551 TH |
535 | if (err) |
536 | goto error; | |
537 | ||
538 | if (sockp) | |
539 | *sockp = sock; | |
540 | ||
541 | return 0; | |
542 | ||
543 | error: | |
544 | kfree(fou); | |
545 | if (sock) | |
02d793c5 | 546 | udp_tunnel_sock_release(sock); |
23461551 TH |
547 | |
548 | return err; | |
549 | } | |
550 | ||
551 | static int fou_destroy(struct net *net, struct fou_cfg *cfg) | |
552 | { | |
02d793c5 | 553 | struct fou_net *fn = net_generic(net, fou_net_id); |
4cbcdf2b | 554 | __be16 port = cfg->udp_config.local_udp_port; |
23461551 | 555 | int err = -EINVAL; |
02d793c5 | 556 | struct fou *fou; |
23461551 | 557 | |
02d793c5 WC |
558 | mutex_lock(&fn->fou_lock); |
559 | list_for_each_entry(fou, &fn->fou_list, list) { | |
23461551 TH |
560 | if (fou->port == port) { |
561 | fou_release(fou); | |
562 | err = 0; | |
563 | break; | |
564 | } | |
565 | } | |
02d793c5 | 566 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
567 | |
568 | return err; | |
569 | } | |
570 | ||
571 | static struct genl_family fou_nl_family = { | |
572 | .id = GENL_ID_GENERATE, | |
573 | .hdrsize = 0, | |
574 | .name = FOU_GENL_NAME, | |
575 | .version = FOU_GENL_VERSION, | |
576 | .maxattr = FOU_ATTR_MAX, | |
577 | .netnsok = true, | |
578 | }; | |
579 | ||
580 | static struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = { | |
581 | [FOU_ATTR_PORT] = { .type = NLA_U16, }, | |
582 | [FOU_ATTR_AF] = { .type = NLA_U8, }, | |
583 | [FOU_ATTR_IPPROTO] = { .type = NLA_U8, }, | |
37dd0247 | 584 | [FOU_ATTR_TYPE] = { .type = NLA_U8, }, |
fe881ef1 | 585 | [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, }, |
23461551 TH |
586 | }; |
587 | ||
588 | static int parse_nl_config(struct genl_info *info, | |
589 | struct fou_cfg *cfg) | |
590 | { | |
591 | memset(cfg, 0, sizeof(*cfg)); | |
592 | ||
593 | cfg->udp_config.family = AF_INET; | |
594 | ||
595 | if (info->attrs[FOU_ATTR_AF]) { | |
596 | u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]); | |
597 | ||
b9b6695c | 598 | if (family != AF_INET) |
23461551 TH |
599 | return -EINVAL; |
600 | ||
601 | cfg->udp_config.family = family; | |
602 | } | |
603 | ||
604 | if (info->attrs[FOU_ATTR_PORT]) { | |
4cbcdf2b | 605 | __be16 port = nla_get_be16(info->attrs[FOU_ATTR_PORT]); |
23461551 TH |
606 | |
607 | cfg->udp_config.local_udp_port = port; | |
608 | } | |
609 | ||
610 | if (info->attrs[FOU_ATTR_IPPROTO]) | |
611 | cfg->protocol = nla_get_u8(info->attrs[FOU_ATTR_IPPROTO]); | |
612 | ||
37dd0247 TH |
613 | if (info->attrs[FOU_ATTR_TYPE]) |
614 | cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]); | |
615 | ||
fe881ef1 TH |
616 | if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL]) |
617 | cfg->flags |= FOU_F_REMCSUM_NOPARTIAL; | |
618 | ||
23461551 TH |
619 | return 0; |
620 | } | |
621 | ||
622 | static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info) | |
623 | { | |
02d793c5 | 624 | struct net *net = genl_info_net(info); |
23461551 TH |
625 | struct fou_cfg cfg; |
626 | int err; | |
627 | ||
628 | err = parse_nl_config(info, &cfg); | |
629 | if (err) | |
630 | return err; | |
631 | ||
02d793c5 | 632 | return fou_create(net, &cfg, NULL); |
23461551 TH |
633 | } |
634 | ||
635 | static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info) | |
636 | { | |
02d793c5 | 637 | struct net *net = genl_info_net(info); |
23461551 | 638 | struct fou_cfg cfg; |
67270636 | 639 | int err; |
23461551 | 640 | |
67270636 WC |
641 | err = parse_nl_config(info, &cfg); |
642 | if (err) | |
643 | return err; | |
23461551 | 644 | |
02d793c5 | 645 | return fou_destroy(net, &cfg); |
23461551 TH |
646 | } |
647 | ||
7a6c8c34 WC |
648 | static int fou_fill_info(struct fou *fou, struct sk_buff *msg) |
649 | { | |
650 | if (nla_put_u8(msg, FOU_ATTR_AF, fou->sock->sk->sk_family) || | |
651 | nla_put_be16(msg, FOU_ATTR_PORT, fou->port) || | |
652 | nla_put_u8(msg, FOU_ATTR_IPPROTO, fou->protocol) || | |
653 | nla_put_u8(msg, FOU_ATTR_TYPE, fou->type)) | |
654 | return -1; | |
655 | ||
656 | if (fou->flags & FOU_F_REMCSUM_NOPARTIAL) | |
657 | if (nla_put_flag(msg, FOU_ATTR_REMCSUM_NOPARTIAL)) | |
658 | return -1; | |
659 | return 0; | |
660 | } | |
661 | ||
662 | static int fou_dump_info(struct fou *fou, u32 portid, u32 seq, | |
663 | u32 flags, struct sk_buff *skb, u8 cmd) | |
664 | { | |
665 | void *hdr; | |
666 | ||
667 | hdr = genlmsg_put(skb, portid, seq, &fou_nl_family, flags, cmd); | |
668 | if (!hdr) | |
669 | return -ENOMEM; | |
670 | ||
671 | if (fou_fill_info(fou, skb) < 0) | |
672 | goto nla_put_failure; | |
673 | ||
674 | genlmsg_end(skb, hdr); | |
675 | return 0; | |
676 | ||
677 | nla_put_failure: | |
678 | genlmsg_cancel(skb, hdr); | |
679 | return -EMSGSIZE; | |
680 | } | |
681 | ||
682 | static int fou_nl_cmd_get_port(struct sk_buff *skb, struct genl_info *info) | |
683 | { | |
684 | struct net *net = genl_info_net(info); | |
685 | struct fou_net *fn = net_generic(net, fou_net_id); | |
686 | struct sk_buff *msg; | |
687 | struct fou_cfg cfg; | |
688 | struct fou *fout; | |
689 | __be16 port; | |
690 | int ret; | |
691 | ||
692 | ret = parse_nl_config(info, &cfg); | |
693 | if (ret) | |
694 | return ret; | |
695 | port = cfg.udp_config.local_udp_port; | |
696 | if (port == 0) | |
697 | return -EINVAL; | |
698 | ||
699 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
700 | if (!msg) | |
701 | return -ENOMEM; | |
702 | ||
703 | ret = -ESRCH; | |
704 | mutex_lock(&fn->fou_lock); | |
705 | list_for_each_entry(fout, &fn->fou_list, list) { | |
706 | if (port == fout->port) { | |
707 | ret = fou_dump_info(fout, info->snd_portid, | |
708 | info->snd_seq, 0, msg, | |
709 | info->genlhdr->cmd); | |
710 | break; | |
711 | } | |
712 | } | |
713 | mutex_unlock(&fn->fou_lock); | |
714 | if (ret < 0) | |
715 | goto out_free; | |
716 | ||
717 | return genlmsg_reply(msg, info); | |
718 | ||
719 | out_free: | |
720 | nlmsg_free(msg); | |
721 | return ret; | |
722 | } | |
723 | ||
724 | static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
725 | { | |
726 | struct net *net = sock_net(skb->sk); | |
727 | struct fou_net *fn = net_generic(net, fou_net_id); | |
728 | struct fou *fout; | |
729 | int idx = 0, ret; | |
730 | ||
731 | mutex_lock(&fn->fou_lock); | |
732 | list_for_each_entry(fout, &fn->fou_list, list) { | |
733 | if (idx++ < cb->args[0]) | |
734 | continue; | |
735 | ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid, | |
736 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
737 | skb, FOU_CMD_GET); | |
738 | if (ret) | |
540207ae | 739 | break; |
7a6c8c34 WC |
740 | } |
741 | mutex_unlock(&fn->fou_lock); | |
742 | ||
7a6c8c34 WC |
743 | cb->args[0] = idx; |
744 | return skb->len; | |
745 | } | |
746 | ||
23461551 TH |
747 | static const struct genl_ops fou_nl_ops[] = { |
748 | { | |
749 | .cmd = FOU_CMD_ADD, | |
750 | .doit = fou_nl_cmd_add_port, | |
751 | .policy = fou_nl_policy, | |
752 | .flags = GENL_ADMIN_PERM, | |
753 | }, | |
754 | { | |
755 | .cmd = FOU_CMD_DEL, | |
756 | .doit = fou_nl_cmd_rm_port, | |
757 | .policy = fou_nl_policy, | |
758 | .flags = GENL_ADMIN_PERM, | |
759 | }, | |
7a6c8c34 WC |
760 | { |
761 | .cmd = FOU_CMD_GET, | |
762 | .doit = fou_nl_cmd_get_port, | |
763 | .dumpit = fou_nl_dump, | |
764 | .policy = fou_nl_policy, | |
765 | }, | |
23461551 TH |
766 | }; |
767 | ||
a8c5f90f TH |
768 | size_t fou_encap_hlen(struct ip_tunnel_encap *e) |
769 | { | |
770 | return sizeof(struct udphdr); | |
771 | } | |
772 | EXPORT_SYMBOL(fou_encap_hlen); | |
773 | ||
774 | size_t gue_encap_hlen(struct ip_tunnel_encap *e) | |
775 | { | |
776 | size_t len; | |
777 | bool need_priv = false; | |
778 | ||
779 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
780 | ||
781 | if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) { | |
782 | len += GUE_PLEN_REMCSUM; | |
783 | need_priv = true; | |
784 | } | |
785 | ||
786 | len += need_priv ? GUE_LEN_PRIV : 0; | |
787 | ||
788 | return len; | |
789 | } | |
790 | EXPORT_SYMBOL(gue_encap_hlen); | |
791 | ||
63487bab TH |
792 | static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e, |
793 | struct flowi4 *fl4, u8 *protocol, __be16 sport) | |
794 | { | |
795 | struct udphdr *uh; | |
796 | ||
797 | skb_push(skb, sizeof(struct udphdr)); | |
798 | skb_reset_transport_header(skb); | |
799 | ||
800 | uh = udp_hdr(skb); | |
801 | ||
802 | uh->dest = e->dport; | |
803 | uh->source = sport; | |
804 | uh->len = htons(skb->len); | |
63487bab TH |
805 | udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb, |
806 | fl4->saddr, fl4->daddr, skb->len); | |
807 | ||
808 | *protocol = IPPROTO_UDP; | |
809 | } | |
810 | ||
811 | int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
812 | u8 *protocol, struct flowi4 *fl4) | |
813 | { | |
06f62292 EC |
814 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM : |
815 | SKB_GSO_UDP_TUNNEL; | |
63487bab TH |
816 | __be16 sport; |
817 | ||
6fa79666 | 818 | skb = iptunnel_handle_offloads(skb, type); |
63487bab TH |
819 | |
820 | if (IS_ERR(skb)) | |
821 | return PTR_ERR(skb); | |
822 | ||
823 | sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
824 | skb, 0, 0, false); | |
825 | fou_build_udp(skb, e, fl4, protocol, sport); | |
826 | ||
827 | return 0; | |
828 | } | |
829 | EXPORT_SYMBOL(fou_build_header); | |
830 | ||
831 | int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
832 | u8 *protocol, struct flowi4 *fl4) | |
833 | { | |
06f62292 EC |
834 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM : |
835 | SKB_GSO_UDP_TUNNEL; | |
63487bab | 836 | struct guehdr *guehdr; |
b17f709a | 837 | size_t hdrlen, optlen = 0; |
63487bab | 838 | __be16 sport; |
5024c33a TH |
839 | void *data; |
840 | bool need_priv = false; | |
841 | ||
b17f709a TH |
842 | if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) && |
843 | skb->ip_summed == CHECKSUM_PARTIAL) { | |
b17f709a TH |
844 | optlen += GUE_PLEN_REMCSUM; |
845 | type |= SKB_GSO_TUNNEL_REMCSUM; | |
846 | need_priv = true; | |
847 | } | |
848 | ||
5024c33a | 849 | optlen += need_priv ? GUE_LEN_PRIV : 0; |
63487bab | 850 | |
6fa79666 | 851 | skb = iptunnel_handle_offloads(skb, type); |
63487bab TH |
852 | |
853 | if (IS_ERR(skb)) | |
854 | return PTR_ERR(skb); | |
855 | ||
856 | /* Get source port (based on flow hash) before skb_push */ | |
857 | sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
858 | skb, 0, 0, false); | |
859 | ||
b17f709a TH |
860 | hdrlen = sizeof(struct guehdr) + optlen; |
861 | ||
862 | skb_push(skb, hdrlen); | |
63487bab TH |
863 | |
864 | guehdr = (struct guehdr *)skb->data; | |
865 | ||
5024c33a | 866 | guehdr->control = 0; |
63487bab | 867 | guehdr->version = 0; |
5024c33a | 868 | guehdr->hlen = optlen >> 2; |
63487bab | 869 | guehdr->flags = 0; |
5024c33a TH |
870 | guehdr->proto_ctype = *protocol; |
871 | ||
872 | data = &guehdr[1]; | |
873 | ||
874 | if (need_priv) { | |
875 | __be32 *flags = data; | |
876 | ||
877 | guehdr->flags |= GUE_FLAG_PRIV; | |
878 | *flags = 0; | |
879 | data += GUE_LEN_PRIV; | |
880 | ||
b17f709a TH |
881 | if (type & SKB_GSO_TUNNEL_REMCSUM) { |
882 | u16 csum_start = skb_checksum_start_offset(skb); | |
883 | __be16 *pd = data; | |
884 | ||
885 | if (csum_start < hdrlen) | |
886 | return -EINVAL; | |
887 | ||
888 | csum_start -= hdrlen; | |
889 | pd[0] = htons(csum_start); | |
890 | pd[1] = htons(csum_start + skb->csum_offset); | |
891 | ||
892 | if (!skb_is_gso(skb)) { | |
893 | skb->ip_summed = CHECKSUM_NONE; | |
894 | skb->encapsulation = 0; | |
895 | } | |
896 | ||
897 | *flags |= GUE_PFLAG_REMCSUM; | |
898 | data += GUE_PLEN_REMCSUM; | |
899 | } | |
900 | ||
5024c33a | 901 | } |
63487bab TH |
902 | |
903 | fou_build_udp(skb, e, fl4, protocol, sport); | |
904 | ||
905 | return 0; | |
906 | } | |
907 | EXPORT_SYMBOL(gue_build_header); | |
908 | ||
a8c5f90f TH |
909 | #ifdef CONFIG_NET_FOU_IP_TUNNELS |
910 | ||
5eeb2922 | 911 | static const struct ip_tunnel_encap_ops fou_iptun_ops = { |
a8c5f90f TH |
912 | .encap_hlen = fou_encap_hlen, |
913 | .build_header = fou_build_header, | |
914 | }; | |
915 | ||
5eeb2922 | 916 | static const struct ip_tunnel_encap_ops gue_iptun_ops = { |
a8c5f90f TH |
917 | .encap_hlen = gue_encap_hlen, |
918 | .build_header = gue_build_header, | |
919 | }; | |
920 | ||
921 | static int ip_tunnel_encap_add_fou_ops(void) | |
922 | { | |
923 | int ret; | |
924 | ||
925 | ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
926 | if (ret < 0) { | |
927 | pr_err("can't add fou ops\n"); | |
928 | return ret; | |
929 | } | |
930 | ||
931 | ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
932 | if (ret < 0) { | |
933 | pr_err("can't add gue ops\n"); | |
934 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
935 | return ret; | |
936 | } | |
937 | ||
938 | return 0; | |
939 | } | |
940 | ||
941 | static void ip_tunnel_encap_del_fou_ops(void) | |
942 | { | |
943 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
944 | ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
945 | } | |
946 | ||
947 | #else | |
948 | ||
949 | static int ip_tunnel_encap_add_fou_ops(void) | |
950 | { | |
951 | return 0; | |
952 | } | |
953 | ||
882288c0 | 954 | static void ip_tunnel_encap_del_fou_ops(void) |
a8c5f90f TH |
955 | { |
956 | } | |
957 | ||
958 | #endif | |
959 | ||
02d793c5 WC |
960 | static __net_init int fou_init_net(struct net *net) |
961 | { | |
962 | struct fou_net *fn = net_generic(net, fou_net_id); | |
963 | ||
964 | INIT_LIST_HEAD(&fn->fou_list); | |
965 | mutex_init(&fn->fou_lock); | |
966 | return 0; | |
967 | } | |
968 | ||
969 | static __net_exit void fou_exit_net(struct net *net) | |
970 | { | |
971 | struct fou_net *fn = net_generic(net, fou_net_id); | |
972 | struct fou *fou, *next; | |
973 | ||
974 | /* Close all the FOU sockets */ | |
975 | mutex_lock(&fn->fou_lock); | |
976 | list_for_each_entry_safe(fou, next, &fn->fou_list, list) | |
977 | fou_release(fou); | |
978 | mutex_unlock(&fn->fou_lock); | |
979 | } | |
980 | ||
981 | static struct pernet_operations fou_net_ops = { | |
982 | .init = fou_init_net, | |
983 | .exit = fou_exit_net, | |
984 | .id = &fou_net_id, | |
985 | .size = sizeof(struct fou_net), | |
986 | }; | |
987 | ||
23461551 TH |
988 | static int __init fou_init(void) |
989 | { | |
990 | int ret; | |
991 | ||
02d793c5 WC |
992 | ret = register_pernet_device(&fou_net_ops); |
993 | if (ret) | |
994 | goto exit; | |
995 | ||
23461551 TH |
996 | ret = genl_register_family_with_ops(&fou_nl_family, |
997 | fou_nl_ops); | |
a8c5f90f | 998 | if (ret < 0) |
02d793c5 | 999 | goto unregister; |
a8c5f90f TH |
1000 | |
1001 | ret = ip_tunnel_encap_add_fou_ops(); | |
02d793c5 WC |
1002 | if (ret == 0) |
1003 | return 0; | |
a8c5f90f | 1004 | |
02d793c5 WC |
1005 | genl_unregister_family(&fou_nl_family); |
1006 | unregister: | |
1007 | unregister_pernet_device(&fou_net_ops); | |
a8c5f90f | 1008 | exit: |
23461551 TH |
1009 | return ret; |
1010 | } | |
1011 | ||
1012 | static void __exit fou_fini(void) | |
1013 | { | |
a8c5f90f | 1014 | ip_tunnel_encap_del_fou_ops(); |
23461551 | 1015 | genl_unregister_family(&fou_nl_family); |
02d793c5 | 1016 | unregister_pernet_device(&fou_net_ops); |
23461551 TH |
1017 | } |
1018 | ||
1019 | module_init(fou_init); | |
1020 | module_exit(fou_fini); | |
1021 | MODULE_AUTHOR("Tom Herbert <therbert@google.com>"); | |
1022 | MODULE_LICENSE("GPL"); |