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 | ||
37dd0247 TH |
451 | static int fou_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) |
452 | { | |
453 | udp_sk(sk)->encap_rcv = fou_udp_recv; | |
d92283e3 TH |
454 | udp_sk(sk)->gro_receive = fou_gro_receive; |
455 | udp_sk(sk)->gro_complete = fou_gro_complete; | |
456 | fou_from_sock(sk)->protocol = cfg->protocol; | |
37dd0247 TH |
457 | |
458 | return 0; | |
459 | } | |
460 | ||
461 | static int gue_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) | |
462 | { | |
463 | udp_sk(sk)->encap_rcv = gue_udp_recv; | |
d92283e3 TH |
464 | udp_sk(sk)->gro_receive = gue_gro_receive; |
465 | udp_sk(sk)->gro_complete = gue_gro_complete; | |
37dd0247 TH |
466 | |
467 | return 0; | |
468 | } | |
469 | ||
23461551 TH |
470 | static int fou_create(struct net *net, struct fou_cfg *cfg, |
471 | struct socket **sockp) | |
472 | { | |
23461551 | 473 | struct socket *sock = NULL; |
02d793c5 | 474 | struct fou *fou = NULL; |
23461551 | 475 | struct sock *sk; |
02d793c5 | 476 | int err; |
23461551 TH |
477 | |
478 | /* Open UDP socket */ | |
479 | err = udp_sock_create(net, &cfg->udp_config, &sock); | |
480 | if (err < 0) | |
481 | goto error; | |
482 | ||
483 | /* Allocate FOU port structure */ | |
484 | fou = kzalloc(sizeof(*fou), GFP_KERNEL); | |
485 | if (!fou) { | |
486 | err = -ENOMEM; | |
487 | goto error; | |
488 | } | |
489 | ||
490 | sk = sock->sk; | |
491 | ||
fe881ef1 | 492 | fou->flags = cfg->flags; |
37dd0247 TH |
493 | fou->port = cfg->udp_config.local_udp_port; |
494 | ||
495 | /* Initial for fou type */ | |
496 | switch (cfg->type) { | |
497 | case FOU_ENCAP_DIRECT: | |
498 | err = fou_encap_init(sk, fou, cfg); | |
499 | if (err) | |
500 | goto error; | |
501 | break; | |
502 | case FOU_ENCAP_GUE: | |
503 | err = gue_encap_init(sk, fou, cfg); | |
504 | if (err) | |
505 | goto error; | |
506 | break; | |
507 | default: | |
508 | err = -EINVAL; | |
509 | goto error; | |
510 | } | |
23461551 | 511 | |
7a6c8c34 WC |
512 | fou->type = cfg->type; |
513 | ||
23461551 TH |
514 | udp_sk(sk)->encap_type = 1; |
515 | udp_encap_enable(); | |
516 | ||
517 | sk->sk_user_data = fou; | |
518 | fou->sock = sock; | |
519 | ||
224d019c | 520 | inet_inc_convert_csum(sk); |
23461551 TH |
521 | |
522 | sk->sk_allocation = GFP_ATOMIC; | |
523 | ||
02d793c5 | 524 | err = fou_add_to_port_list(net, fou); |
23461551 TH |
525 | if (err) |
526 | goto error; | |
527 | ||
528 | if (sockp) | |
529 | *sockp = sock; | |
530 | ||
531 | return 0; | |
532 | ||
533 | error: | |
534 | kfree(fou); | |
535 | if (sock) | |
02d793c5 | 536 | udp_tunnel_sock_release(sock); |
23461551 TH |
537 | |
538 | return err; | |
539 | } | |
540 | ||
541 | static int fou_destroy(struct net *net, struct fou_cfg *cfg) | |
542 | { | |
02d793c5 | 543 | struct fou_net *fn = net_generic(net, fou_net_id); |
4cbcdf2b | 544 | __be16 port = cfg->udp_config.local_udp_port; |
23461551 | 545 | int err = -EINVAL; |
02d793c5 | 546 | struct fou *fou; |
23461551 | 547 | |
02d793c5 WC |
548 | mutex_lock(&fn->fou_lock); |
549 | list_for_each_entry(fou, &fn->fou_list, list) { | |
23461551 TH |
550 | if (fou->port == port) { |
551 | fou_release(fou); | |
552 | err = 0; | |
553 | break; | |
554 | } | |
555 | } | |
02d793c5 | 556 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
557 | |
558 | return err; | |
559 | } | |
560 | ||
561 | static struct genl_family fou_nl_family = { | |
562 | .id = GENL_ID_GENERATE, | |
563 | .hdrsize = 0, | |
564 | .name = FOU_GENL_NAME, | |
565 | .version = FOU_GENL_VERSION, | |
566 | .maxattr = FOU_ATTR_MAX, | |
567 | .netnsok = true, | |
568 | }; | |
569 | ||
570 | static struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = { | |
571 | [FOU_ATTR_PORT] = { .type = NLA_U16, }, | |
572 | [FOU_ATTR_AF] = { .type = NLA_U8, }, | |
573 | [FOU_ATTR_IPPROTO] = { .type = NLA_U8, }, | |
37dd0247 | 574 | [FOU_ATTR_TYPE] = { .type = NLA_U8, }, |
fe881ef1 | 575 | [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, }, |
23461551 TH |
576 | }; |
577 | ||
578 | static int parse_nl_config(struct genl_info *info, | |
579 | struct fou_cfg *cfg) | |
580 | { | |
581 | memset(cfg, 0, sizeof(*cfg)); | |
582 | ||
583 | cfg->udp_config.family = AF_INET; | |
584 | ||
585 | if (info->attrs[FOU_ATTR_AF]) { | |
586 | u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]); | |
587 | ||
b9b6695c | 588 | if (family != AF_INET) |
23461551 TH |
589 | return -EINVAL; |
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; | |
680 | int ret; | |
681 | ||
682 | ret = parse_nl_config(info, &cfg); | |
683 | if (ret) | |
684 | return ret; | |
685 | port = cfg.udp_config.local_udp_port; | |
686 | if (port == 0) | |
687 | return -EINVAL; | |
688 | ||
689 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
690 | if (!msg) | |
691 | return -ENOMEM; | |
692 | ||
693 | ret = -ESRCH; | |
694 | mutex_lock(&fn->fou_lock); | |
695 | list_for_each_entry(fout, &fn->fou_list, list) { | |
696 | if (port == fout->port) { | |
697 | ret = fou_dump_info(fout, info->snd_portid, | |
698 | info->snd_seq, 0, msg, | |
699 | info->genlhdr->cmd); | |
700 | break; | |
701 | } | |
702 | } | |
703 | mutex_unlock(&fn->fou_lock); | |
704 | if (ret < 0) | |
705 | goto out_free; | |
706 | ||
707 | return genlmsg_reply(msg, info); | |
708 | ||
709 | out_free: | |
710 | nlmsg_free(msg); | |
711 | return ret; | |
712 | } | |
713 | ||
714 | static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
715 | { | |
716 | struct net *net = sock_net(skb->sk); | |
717 | struct fou_net *fn = net_generic(net, fou_net_id); | |
718 | struct fou *fout; | |
719 | int idx = 0, ret; | |
720 | ||
721 | mutex_lock(&fn->fou_lock); | |
722 | list_for_each_entry(fout, &fn->fou_list, list) { | |
723 | if (idx++ < cb->args[0]) | |
724 | continue; | |
725 | ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid, | |
726 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
727 | skb, FOU_CMD_GET); | |
728 | if (ret) | |
540207ae | 729 | break; |
7a6c8c34 WC |
730 | } |
731 | mutex_unlock(&fn->fou_lock); | |
732 | ||
7a6c8c34 WC |
733 | cb->args[0] = idx; |
734 | return skb->len; | |
735 | } | |
736 | ||
23461551 TH |
737 | static const struct genl_ops fou_nl_ops[] = { |
738 | { | |
739 | .cmd = FOU_CMD_ADD, | |
740 | .doit = fou_nl_cmd_add_port, | |
741 | .policy = fou_nl_policy, | |
742 | .flags = GENL_ADMIN_PERM, | |
743 | }, | |
744 | { | |
745 | .cmd = FOU_CMD_DEL, | |
746 | .doit = fou_nl_cmd_rm_port, | |
747 | .policy = fou_nl_policy, | |
748 | .flags = GENL_ADMIN_PERM, | |
749 | }, | |
7a6c8c34 WC |
750 | { |
751 | .cmd = FOU_CMD_GET, | |
752 | .doit = fou_nl_cmd_get_port, | |
753 | .dumpit = fou_nl_dump, | |
754 | .policy = fou_nl_policy, | |
755 | }, | |
23461551 TH |
756 | }; |
757 | ||
a8c5f90f TH |
758 | size_t fou_encap_hlen(struct ip_tunnel_encap *e) |
759 | { | |
760 | return sizeof(struct udphdr); | |
761 | } | |
762 | EXPORT_SYMBOL(fou_encap_hlen); | |
763 | ||
764 | size_t gue_encap_hlen(struct ip_tunnel_encap *e) | |
765 | { | |
766 | size_t len; | |
767 | bool need_priv = false; | |
768 | ||
769 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
770 | ||
771 | if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) { | |
772 | len += GUE_PLEN_REMCSUM; | |
773 | need_priv = true; | |
774 | } | |
775 | ||
776 | len += need_priv ? GUE_LEN_PRIV : 0; | |
777 | ||
778 | return len; | |
779 | } | |
780 | EXPORT_SYMBOL(gue_encap_hlen); | |
781 | ||
63487bab TH |
782 | static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e, |
783 | struct flowi4 *fl4, u8 *protocol, __be16 sport) | |
784 | { | |
785 | struct udphdr *uh; | |
786 | ||
787 | skb_push(skb, sizeof(struct udphdr)); | |
788 | skb_reset_transport_header(skb); | |
789 | ||
790 | uh = udp_hdr(skb); | |
791 | ||
792 | uh->dest = e->dport; | |
793 | uh->source = sport; | |
794 | uh->len = htons(skb->len); | |
63487bab TH |
795 | udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb, |
796 | fl4->saddr, fl4->daddr, skb->len); | |
797 | ||
798 | *protocol = IPPROTO_UDP; | |
799 | } | |
800 | ||
801 | int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
802 | u8 *protocol, struct flowi4 *fl4) | |
803 | { | |
06f62292 EC |
804 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM : |
805 | SKB_GSO_UDP_TUNNEL; | |
63487bab | 806 | __be16 sport; |
aed069df | 807 | int err; |
63487bab | 808 | |
aed069df AD |
809 | err = iptunnel_handle_offloads(skb, type); |
810 | if (err) | |
811 | return err; | |
63487bab TH |
812 | |
813 | sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
814 | skb, 0, 0, false); | |
815 | fou_build_udp(skb, e, fl4, protocol, sport); | |
816 | ||
817 | return 0; | |
818 | } | |
819 | EXPORT_SYMBOL(fou_build_header); | |
820 | ||
821 | int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
822 | u8 *protocol, struct flowi4 *fl4) | |
823 | { | |
06f62292 EC |
824 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM : |
825 | SKB_GSO_UDP_TUNNEL; | |
63487bab | 826 | struct guehdr *guehdr; |
b17f709a | 827 | size_t hdrlen, optlen = 0; |
63487bab | 828 | __be16 sport; |
5024c33a TH |
829 | void *data; |
830 | bool need_priv = false; | |
aed069df | 831 | int err; |
5024c33a | 832 | |
b17f709a TH |
833 | if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) && |
834 | skb->ip_summed == CHECKSUM_PARTIAL) { | |
b17f709a TH |
835 | optlen += GUE_PLEN_REMCSUM; |
836 | type |= SKB_GSO_TUNNEL_REMCSUM; | |
837 | need_priv = true; | |
838 | } | |
839 | ||
5024c33a | 840 | optlen += need_priv ? GUE_LEN_PRIV : 0; |
63487bab | 841 | |
aed069df AD |
842 | err = iptunnel_handle_offloads(skb, type); |
843 | if (err) | |
844 | return err; | |
63487bab TH |
845 | |
846 | /* Get source port (based on flow hash) before skb_push */ | |
847 | sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
848 | skb, 0, 0, false); | |
849 | ||
b17f709a TH |
850 | hdrlen = sizeof(struct guehdr) + optlen; |
851 | ||
852 | skb_push(skb, hdrlen); | |
63487bab TH |
853 | |
854 | guehdr = (struct guehdr *)skb->data; | |
855 | ||
5024c33a | 856 | guehdr->control = 0; |
63487bab | 857 | guehdr->version = 0; |
5024c33a | 858 | guehdr->hlen = optlen >> 2; |
63487bab | 859 | guehdr->flags = 0; |
5024c33a TH |
860 | guehdr->proto_ctype = *protocol; |
861 | ||
862 | data = &guehdr[1]; | |
863 | ||
864 | if (need_priv) { | |
865 | __be32 *flags = data; | |
866 | ||
867 | guehdr->flags |= GUE_FLAG_PRIV; | |
868 | *flags = 0; | |
869 | data += GUE_LEN_PRIV; | |
870 | ||
b17f709a TH |
871 | if (type & SKB_GSO_TUNNEL_REMCSUM) { |
872 | u16 csum_start = skb_checksum_start_offset(skb); | |
873 | __be16 *pd = data; | |
874 | ||
875 | if (csum_start < hdrlen) | |
876 | return -EINVAL; | |
877 | ||
878 | csum_start -= hdrlen; | |
879 | pd[0] = htons(csum_start); | |
880 | pd[1] = htons(csum_start + skb->csum_offset); | |
881 | ||
882 | if (!skb_is_gso(skb)) { | |
883 | skb->ip_summed = CHECKSUM_NONE; | |
884 | skb->encapsulation = 0; | |
885 | } | |
886 | ||
887 | *flags |= GUE_PFLAG_REMCSUM; | |
888 | data += GUE_PLEN_REMCSUM; | |
889 | } | |
890 | ||
5024c33a | 891 | } |
63487bab TH |
892 | |
893 | fou_build_udp(skb, e, fl4, protocol, sport); | |
894 | ||
895 | return 0; | |
896 | } | |
897 | EXPORT_SYMBOL(gue_build_header); | |
898 | ||
a8c5f90f TH |
899 | #ifdef CONFIG_NET_FOU_IP_TUNNELS |
900 | ||
5eeb2922 | 901 | static const struct ip_tunnel_encap_ops fou_iptun_ops = { |
a8c5f90f TH |
902 | .encap_hlen = fou_encap_hlen, |
903 | .build_header = fou_build_header, | |
904 | }; | |
905 | ||
5eeb2922 | 906 | static const struct ip_tunnel_encap_ops gue_iptun_ops = { |
a8c5f90f TH |
907 | .encap_hlen = gue_encap_hlen, |
908 | .build_header = gue_build_header, | |
909 | }; | |
910 | ||
911 | static int ip_tunnel_encap_add_fou_ops(void) | |
912 | { | |
913 | int ret; | |
914 | ||
915 | ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
916 | if (ret < 0) { | |
917 | pr_err("can't add fou ops\n"); | |
918 | return ret; | |
919 | } | |
920 | ||
921 | ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
922 | if (ret < 0) { | |
923 | pr_err("can't add gue ops\n"); | |
924 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
925 | return ret; | |
926 | } | |
927 | ||
928 | return 0; | |
929 | } | |
930 | ||
931 | static void ip_tunnel_encap_del_fou_ops(void) | |
932 | { | |
933 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
934 | ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
935 | } | |
936 | ||
937 | #else | |
938 | ||
939 | static int ip_tunnel_encap_add_fou_ops(void) | |
940 | { | |
941 | return 0; | |
942 | } | |
943 | ||
882288c0 | 944 | static void ip_tunnel_encap_del_fou_ops(void) |
a8c5f90f TH |
945 | { |
946 | } | |
947 | ||
948 | #endif | |
949 | ||
02d793c5 WC |
950 | static __net_init int fou_init_net(struct net *net) |
951 | { | |
952 | struct fou_net *fn = net_generic(net, fou_net_id); | |
953 | ||
954 | INIT_LIST_HEAD(&fn->fou_list); | |
955 | mutex_init(&fn->fou_lock); | |
956 | return 0; | |
957 | } | |
958 | ||
959 | static __net_exit void fou_exit_net(struct net *net) | |
960 | { | |
961 | struct fou_net *fn = net_generic(net, fou_net_id); | |
962 | struct fou *fou, *next; | |
963 | ||
964 | /* Close all the FOU sockets */ | |
965 | mutex_lock(&fn->fou_lock); | |
966 | list_for_each_entry_safe(fou, next, &fn->fou_list, list) | |
967 | fou_release(fou); | |
968 | mutex_unlock(&fn->fou_lock); | |
969 | } | |
970 | ||
971 | static struct pernet_operations fou_net_ops = { | |
972 | .init = fou_init_net, | |
973 | .exit = fou_exit_net, | |
974 | .id = &fou_net_id, | |
975 | .size = sizeof(struct fou_net), | |
976 | }; | |
977 | ||
23461551 TH |
978 | static int __init fou_init(void) |
979 | { | |
980 | int ret; | |
981 | ||
02d793c5 WC |
982 | ret = register_pernet_device(&fou_net_ops); |
983 | if (ret) | |
984 | goto exit; | |
985 | ||
23461551 TH |
986 | ret = genl_register_family_with_ops(&fou_nl_family, |
987 | fou_nl_ops); | |
a8c5f90f | 988 | if (ret < 0) |
02d793c5 | 989 | goto unregister; |
a8c5f90f TH |
990 | |
991 | ret = ip_tunnel_encap_add_fou_ops(); | |
02d793c5 WC |
992 | if (ret == 0) |
993 | return 0; | |
a8c5f90f | 994 | |
02d793c5 WC |
995 | genl_unregister_family(&fou_nl_family); |
996 | unregister: | |
997 | unregister_pernet_device(&fou_net_ops); | |
a8c5f90f | 998 | exit: |
23461551 TH |
999 | return ret; |
1000 | } | |
1001 | ||
1002 | static void __exit fou_fini(void) | |
1003 | { | |
a8c5f90f | 1004 | ip_tunnel_encap_del_fou_ops(); |
23461551 | 1005 | genl_unregister_family(&fou_nl_family); |
02d793c5 | 1006 | unregister_pernet_device(&fou_net_ops); |
23461551 TH |
1007 | } |
1008 | ||
1009 | module_init(fou_init); | |
1010 | module_exit(fou_fini); | |
1011 | MODULE_AUTHOR("Tom Herbert <therbert@google.com>"); | |
1012 | MODULE_LICENSE("GPL"); |