]>
Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
23461551 TH |
2 | #include <linux/module.h> |
3 | #include <linux/errno.h> | |
4 | #include <linux/socket.h> | |
5 | #include <linux/skbuff.h> | |
6 | #include <linux/ip.h> | |
b8a51b38 | 7 | #include <linux/icmp.h> |
23461551 TH |
8 | #include <linux/udp.h> |
9 | #include <linux/types.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <net/genetlink.h> | |
37dd0247 | 12 | #include <net/gue.h> |
9dc621af | 13 | #include <net/fou.h> |
23461551 | 14 | #include <net/ip.h> |
afe93325 | 15 | #include <net/protocol.h> |
23461551 TH |
16 | #include <net/udp.h> |
17 | #include <net/udp_tunnel.h> | |
18 | #include <net/xfrm.h> | |
19 | #include <uapi/linux/fou.h> | |
20 | #include <uapi/linux/genetlink.h> | |
21 | ||
23461551 TH |
22 | struct fou { |
23 | struct socket *sock; | |
24 | u8 protocol; | |
fe881ef1 | 25 | u8 flags; |
4cbcdf2b | 26 | __be16 port; |
5f914b68 | 27 | u8 family; |
7a6c8c34 | 28 | u16 type; |
23461551 | 29 | struct list_head list; |
3036facb | 30 | struct rcu_head rcu; |
23461551 TH |
31 | }; |
32 | ||
fe881ef1 TH |
33 | #define FOU_F_REMCSUM_NOPARTIAL BIT(0) |
34 | ||
23461551 | 35 | struct fou_cfg { |
37dd0247 | 36 | u16 type; |
23461551 | 37 | u8 protocol; |
fe881ef1 | 38 | u8 flags; |
23461551 TH |
39 | struct udp_port_cfg udp_config; |
40 | }; | |
41 | ||
02d793c5 WC |
42 | static unsigned int fou_net_id; |
43 | ||
44 | struct fou_net { | |
45 | struct list_head fou_list; | |
46 | struct mutex fou_lock; | |
47 | }; | |
48 | ||
23461551 TH |
49 | static inline struct fou *fou_from_sock(struct sock *sk) |
50 | { | |
51 | return sk->sk_user_data; | |
52 | } | |
53 | ||
5f914b68 | 54 | static int fou_recv_pull(struct sk_buff *skb, struct fou *fou, size_t len) |
23461551 | 55 | { |
23461551 | 56 | /* Remove 'len' bytes from the packet (UDP header and |
5024c33a | 57 | * FOU header if present). |
23461551 | 58 | */ |
5f914b68 TH |
59 | if (fou->family == AF_INET) |
60 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len); | |
61 | else | |
62 | ipv6_hdr(skb)->payload_len = | |
63 | htons(ntohs(ipv6_hdr(skb)->payload_len) - len); | |
64 | ||
23461551 TH |
65 | __skb_pull(skb, len); |
66 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
67 | skb_reset_transport_header(skb); | |
a09a4c8d | 68 | return iptunnel_pull_offloads(skb); |
23461551 TH |
69 | } |
70 | ||
71 | static int fou_udp_recv(struct sock *sk, struct sk_buff *skb) | |
72 | { | |
73 | struct fou *fou = fou_from_sock(sk); | |
74 | ||
75 | if (!fou) | |
76 | return 1; | |
77 | ||
5f914b68 | 78 | if (fou_recv_pull(skb, fou, sizeof(struct udphdr))) |
a09a4c8d | 79 | goto drop; |
5024c33a TH |
80 | |
81 | return -fou->protocol; | |
a09a4c8d JG |
82 | |
83 | drop: | |
84 | kfree_skb(skb); | |
85 | return 0; | |
5024c33a TH |
86 | } |
87 | ||
a8d31c12 | 88 | static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr, |
fe881ef1 TH |
89 | void *data, size_t hdrlen, u8 ipproto, |
90 | bool nopartial) | |
a8d31c12 TH |
91 | { |
92 | __be16 *pd = data; | |
4fd671de TH |
93 | size_t start = ntohs(pd[0]); |
94 | size_t offset = ntohs(pd[1]); | |
b7fe10e5 TH |
95 | size_t plen = sizeof(struct udphdr) + hdrlen + |
96 | max_t(size_t, offset + sizeof(u16), start); | |
97 | ||
98 | if (skb->remcsum_offload) | |
99 | return guehdr; | |
a8d31c12 | 100 | |
a8d31c12 TH |
101 | if (!pskb_may_pull(skb, plen)) |
102 | return NULL; | |
103 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
104 | ||
fe881ef1 TH |
105 | skb_remcsum_process(skb, (void *)guehdr + hdrlen, |
106 | start, offset, nopartial); | |
a8d31c12 TH |
107 | |
108 | return guehdr; | |
109 | } | |
110 | ||
5024c33a TH |
111 | static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr) |
112 | { | |
113 | /* No support yet */ | |
114 | kfree_skb(skb); | |
115 | return 0; | |
23461551 TH |
116 | } |
117 | ||
37dd0247 TH |
118 | static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) |
119 | { | |
120 | struct fou *fou = fou_from_sock(sk); | |
5024c33a | 121 | size_t len, optlen, hdrlen; |
37dd0247 | 122 | struct guehdr *guehdr; |
5024c33a | 123 | void *data; |
a8d31c12 | 124 | u16 doffset = 0; |
988dc4a9 | 125 | u8 proto_ctype; |
37dd0247 TH |
126 | |
127 | if (!fou) | |
128 | return 1; | |
129 | ||
130 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
131 | if (!pskb_may_pull(skb, len)) | |
132 | goto drop; | |
133 | ||
5024c33a TH |
134 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; |
135 | ||
c1e48af7 TH |
136 | switch (guehdr->version) { |
137 | case 0: /* Full GUE header present */ | |
138 | break; | |
139 | ||
140 | case 1: { | |
c9d52f21 | 141 | /* Direct encapsulation of IPv4 or IPv6 */ |
c1e48af7 TH |
142 | |
143 | int prot; | |
144 | ||
145 | switch (((struct iphdr *)guehdr)->version) { | |
146 | case 4: | |
147 | prot = IPPROTO_IPIP; | |
148 | break; | |
149 | case 6: | |
150 | prot = IPPROTO_IPV6; | |
151 | break; | |
152 | default: | |
153 | goto drop; | |
154 | } | |
155 | ||
156 | if (fou_recv_pull(skb, fou, sizeof(struct udphdr))) | |
157 | goto drop; | |
158 | ||
159 | return -prot; | |
160 | } | |
161 | ||
162 | default: /* Undefined version */ | |
163 | goto drop; | |
164 | } | |
165 | ||
5024c33a TH |
166 | optlen = guehdr->hlen << 2; |
167 | len += optlen; | |
37dd0247 | 168 | |
37dd0247 TH |
169 | if (!pskb_may_pull(skb, len)) |
170 | goto drop; | |
171 | ||
5024c33a TH |
172 | /* guehdr may change after pull */ |
173 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
d8f00d27 | 174 | |
526bb57a | 175 | if (validate_gue_flags(guehdr, optlen)) |
37dd0247 | 176 | goto drop; |
5024c33a | 177 | |
a8d31c12 TH |
178 | hdrlen = sizeof(struct guehdr) + optlen; |
179 | ||
5f914b68 TH |
180 | if (fou->family == AF_INET) |
181 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len); | |
182 | else | |
183 | ipv6_hdr(skb)->payload_len = | |
184 | htons(ntohs(ipv6_hdr(skb)->payload_len) - len); | |
a8d31c12 | 185 | |
a8d31c12 TH |
186 | /* Pull csum through the guehdr now . This can be used if |
187 | * there is a remote checksum offload. | |
188 | */ | |
189 | skb_postpull_rcsum(skb, udp_hdr(skb), len); | |
5024c33a TH |
190 | |
191 | data = &guehdr[1]; | |
192 | ||
193 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 TH |
194 | __be32 flags = *(__be32 *)(data + doffset); |
195 | ||
196 | doffset += GUE_LEN_PRIV; | |
197 | ||
198 | if (flags & GUE_PFLAG_REMCSUM) { | |
199 | guehdr = gue_remcsum(skb, guehdr, data + doffset, | |
fe881ef1 TH |
200 | hdrlen, guehdr->proto_ctype, |
201 | !!(fou->flags & | |
202 | FOU_F_REMCSUM_NOPARTIAL)); | |
a8d31c12 TH |
203 | if (!guehdr) |
204 | goto drop; | |
205 | ||
206 | data = &guehdr[1]; | |
5024c33a | 207 | |
a8d31c12 TH |
208 | doffset += GUE_PLEN_REMCSUM; |
209 | } | |
37dd0247 TH |
210 | } |
211 | ||
5024c33a TH |
212 | if (unlikely(guehdr->control)) |
213 | return gue_control_message(skb, guehdr); | |
214 | ||
988dc4a9 | 215 | proto_ctype = guehdr->proto_ctype; |
4fd671de | 216 | __skb_pull(skb, sizeof(struct udphdr) + hdrlen); |
a8d31c12 TH |
217 | skb_reset_transport_header(skb); |
218 | ||
a09a4c8d JG |
219 | if (iptunnel_pull_offloads(skb)) |
220 | goto drop; | |
221 | ||
988dc4a9 | 222 | return -proto_ctype; |
5024c33a | 223 | |
37dd0247 TH |
224 | drop: |
225 | kfree_skb(skb); | |
226 | return 0; | |
227 | } | |
228 | ||
d4546c25 DM |
229 | static struct sk_buff *fou_gro_receive(struct sock *sk, |
230 | struct list_head *head, | |
231 | struct sk_buff *skb) | |
afe93325 | 232 | { |
d92283e3 | 233 | u8 proto = fou_from_sock(sk)->protocol; |
efc98d08 | 234 | const struct net_offload **offloads; |
d4546c25 DM |
235 | const struct net_offload *ops; |
236 | struct sk_buff *pp = NULL; | |
afe93325 | 237 | |
c3483384 AD |
238 | /* We can clear the encap_mark for FOU as we are essentially doing |
239 | * one of two possible things. We are either adding an L4 tunnel | |
240 | * header to the outer L3 tunnel header, or we are are simply | |
241 | * treating the GRE tunnel header as though it is a UDP protocol | |
242 | * specific header such as VXLAN or GENEVE. | |
243 | */ | |
244 | NAPI_GRO_CB(skb)->encap_mark = 0; | |
245 | ||
a0ca153f AD |
246 | /* Flag this frame as already having an outer encap header */ |
247 | NAPI_GRO_CB(skb)->is_fou = 1; | |
248 | ||
afe93325 | 249 | rcu_read_lock(); |
efc98d08 | 250 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
251 | ops = rcu_dereference(offloads[proto]); |
252 | if (!ops || !ops->callbacks.gro_receive) | |
253 | goto out_unlock; | |
254 | ||
fcd91dd4 | 255 | pp = call_gro_receive(ops->callbacks.gro_receive, head, skb); |
afe93325 TH |
256 | |
257 | out_unlock: | |
258 | rcu_read_unlock(); | |
259 | ||
260 | return pp; | |
261 | } | |
262 | ||
d92283e3 TH |
263 | static int fou_gro_complete(struct sock *sk, struct sk_buff *skb, |
264 | int nhoff) | |
afe93325 TH |
265 | { |
266 | const struct net_offload *ops; | |
d92283e3 | 267 | u8 proto = fou_from_sock(sk)->protocol; |
afe93325 | 268 | int err = -ENOSYS; |
efc98d08 | 269 | const struct net_offload **offloads; |
afe93325 TH |
270 | |
271 | rcu_read_lock(); | |
efc98d08 | 272 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; |
afe93325 TH |
273 | ops = rcu_dereference(offloads[proto]); |
274 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
275 | goto out_unlock; | |
276 | ||
277 | err = ops->callbacks.gro_complete(skb, nhoff); | |
278 | ||
229740c6 JR |
279 | skb_set_inner_mac_header(skb, nhoff); |
280 | ||
afe93325 TH |
281 | out_unlock: |
282 | rcu_read_unlock(); | |
283 | ||
284 | return err; | |
285 | } | |
286 | ||
a8d31c12 TH |
287 | static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, |
288 | struct guehdr *guehdr, void *data, | |
b7fe10e5 TH |
289 | size_t hdrlen, struct gro_remcsum *grc, |
290 | bool nopartial) | |
a8d31c12 TH |
291 | { |
292 | __be16 *pd = data; | |
4fd671de TH |
293 | size_t start = ntohs(pd[0]); |
294 | size_t offset = ntohs(pd[1]); | |
a8d31c12 TH |
295 | |
296 | if (skb->remcsum_offload) | |
b7fe10e5 | 297 | return guehdr; |
a8d31c12 | 298 | |
4fd671de | 299 | if (!NAPI_GRO_CB(skb)->csum_valid) |
a8d31c12 TH |
300 | return NULL; |
301 | ||
b7fe10e5 TH |
302 | guehdr = skb_gro_remcsum_process(skb, (void *)guehdr, off, hdrlen, |
303 | start, offset, grc, nopartial); | |
a8d31c12 TH |
304 | |
305 | skb->remcsum_offload = 1; | |
306 | ||
307 | return guehdr; | |
308 | } | |
309 | ||
d4546c25 DM |
310 | static struct sk_buff *gue_gro_receive(struct sock *sk, |
311 | struct list_head *head, | |
312 | struct sk_buff *skb) | |
37dd0247 TH |
313 | { |
314 | const struct net_offload **offloads; | |
315 | const struct net_offload *ops; | |
d4546c25 | 316 | struct sk_buff *pp = NULL; |
37dd0247 | 317 | struct sk_buff *p; |
37dd0247 | 318 | struct guehdr *guehdr; |
5024c33a TH |
319 | size_t len, optlen, hdrlen, off; |
320 | void *data; | |
a8d31c12 | 321 | u16 doffset = 0; |
37dd0247 | 322 | int flush = 1; |
d92283e3 | 323 | struct fou *fou = fou_from_sock(sk); |
26c4f7da | 324 | struct gro_remcsum grc; |
c1e48af7 | 325 | u8 proto; |
26c4f7da TH |
326 | |
327 | skb_gro_remcsum_init(&grc); | |
37dd0247 TH |
328 | |
329 | off = skb_gro_offset(skb); | |
5024c33a TH |
330 | len = off + sizeof(*guehdr); |
331 | ||
37dd0247 | 332 | guehdr = skb_gro_header_fast(skb, off); |
5024c33a TH |
333 | if (skb_gro_header_hard(skb, len)) { |
334 | guehdr = skb_gro_header_slow(skb, len, off); | |
37dd0247 TH |
335 | if (unlikely(!guehdr)) |
336 | goto out; | |
337 | } | |
338 | ||
c1e48af7 TH |
339 | switch (guehdr->version) { |
340 | case 0: | |
341 | break; | |
342 | case 1: | |
343 | switch (((struct iphdr *)guehdr)->version) { | |
344 | case 4: | |
345 | proto = IPPROTO_IPIP; | |
346 | break; | |
347 | case 6: | |
348 | proto = IPPROTO_IPV6; | |
349 | break; | |
350 | default: | |
351 | goto out; | |
352 | } | |
353 | goto next_proto; | |
354 | default: | |
355 | goto out; | |
356 | } | |
357 | ||
5024c33a TH |
358 | optlen = guehdr->hlen << 2; |
359 | len += optlen; | |
37dd0247 | 360 | |
5024c33a TH |
361 | if (skb_gro_header_hard(skb, len)) { |
362 | guehdr = skb_gro_header_slow(skb, len, off); | |
363 | if (unlikely(!guehdr)) | |
364 | goto out; | |
365 | } | |
37dd0247 | 366 | |
5024c33a TH |
367 | if (unlikely(guehdr->control) || guehdr->version != 0 || |
368 | validate_gue_flags(guehdr, optlen)) | |
369 | goto out; | |
37dd0247 | 370 | |
5024c33a TH |
371 | hdrlen = sizeof(*guehdr) + optlen; |
372 | ||
a8d31c12 TH |
373 | /* Adjust NAPI_GRO_CB(skb)->csum to account for guehdr, |
374 | * this is needed if there is a remote checkcsum offload. | |
375 | */ | |
5024c33a TH |
376 | skb_gro_postpull_rcsum(skb, guehdr, hdrlen); |
377 | ||
378 | data = &guehdr[1]; | |
379 | ||
380 | if (guehdr->flags & GUE_FLAG_PRIV) { | |
a8d31c12 | 381 | __be32 flags = *(__be32 *)(data + doffset); |
5024c33a | 382 | |
a8d31c12 TH |
383 | doffset += GUE_LEN_PRIV; |
384 | ||
385 | if (flags & GUE_PFLAG_REMCSUM) { | |
386 | guehdr = gue_gro_remcsum(skb, off, guehdr, | |
b7fe10e5 | 387 | data + doffset, hdrlen, &grc, |
fe881ef1 TH |
388 | !!(fou->flags & |
389 | FOU_F_REMCSUM_NOPARTIAL)); | |
b7fe10e5 | 390 | |
a8d31c12 TH |
391 | if (!guehdr) |
392 | goto out; | |
393 | ||
394 | data = &guehdr[1]; | |
395 | ||
396 | doffset += GUE_PLEN_REMCSUM; | |
397 | } | |
37dd0247 TH |
398 | } |
399 | ||
a8d31c12 TH |
400 | skb_gro_pull(skb, hdrlen); |
401 | ||
d4546c25 | 402 | list_for_each_entry(p, head, list) { |
37dd0247 TH |
403 | const struct guehdr *guehdr2; |
404 | ||
405 | if (!NAPI_GRO_CB(p)->same_flow) | |
406 | continue; | |
407 | ||
408 | guehdr2 = (struct guehdr *)(p->data + off); | |
409 | ||
410 | /* Compare base GUE header to be equal (covers | |
5024c33a | 411 | * hlen, version, proto_ctype, and flags. |
37dd0247 TH |
412 | */ |
413 | if (guehdr->word != guehdr2->word) { | |
414 | NAPI_GRO_CB(p)->same_flow = 0; | |
415 | continue; | |
416 | } | |
417 | ||
418 | /* Compare optional fields are the same. */ | |
419 | if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1], | |
420 | guehdr->hlen << 2)) { | |
421 | NAPI_GRO_CB(p)->same_flow = 0; | |
422 | continue; | |
423 | } | |
424 | } | |
425 | ||
c1e48af7 TH |
426 | proto = guehdr->proto_ctype; |
427 | ||
428 | next_proto: | |
429 | ||
c3483384 AD |
430 | /* We can clear the encap_mark for GUE as we are essentially doing |
431 | * one of two possible things. We are either adding an L4 tunnel | |
432 | * header to the outer L3 tunnel header, or we are are simply | |
433 | * treating the GRE tunnel header as though it is a UDP protocol | |
434 | * specific header such as VXLAN or GENEVE. | |
435 | */ | |
436 | NAPI_GRO_CB(skb)->encap_mark = 0; | |
437 | ||
a0ca153f AD |
438 | /* Flag this frame as already having an outer encap header */ |
439 | NAPI_GRO_CB(skb)->is_fou = 1; | |
440 | ||
5024c33a TH |
441 | rcu_read_lock(); |
442 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
c1e48af7 | 443 | ops = rcu_dereference(offloads[proto]); |
27013661 | 444 | if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive)) |
5024c33a | 445 | goto out_unlock; |
37dd0247 | 446 | |
fcd91dd4 | 447 | pp = call_gro_receive(ops->callbacks.gro_receive, head, skb); |
c194cf93 | 448 | flush = 0; |
37dd0247 TH |
449 | |
450 | out_unlock: | |
451 | rcu_read_unlock(); | |
452 | out: | |
603d4cf8 | 453 | skb_gro_flush_final_remcsum(skb, pp, flush, &grc); |
37dd0247 TH |
454 | |
455 | return pp; | |
456 | } | |
457 | ||
d92283e3 | 458 | static int gue_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) |
37dd0247 TH |
459 | { |
460 | const struct net_offload **offloads; | |
461 | struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff); | |
462 | const struct net_offload *ops; | |
c1e48af7 | 463 | unsigned int guehlen = 0; |
37dd0247 TH |
464 | u8 proto; |
465 | int err = -ENOENT; | |
466 | ||
c1e48af7 TH |
467 | switch (guehdr->version) { |
468 | case 0: | |
469 | proto = guehdr->proto_ctype; | |
470 | guehlen = sizeof(*guehdr) + (guehdr->hlen << 2); | |
471 | break; | |
472 | case 1: | |
473 | switch (((struct iphdr *)guehdr)->version) { | |
474 | case 4: | |
475 | proto = IPPROTO_IPIP; | |
476 | break; | |
477 | case 6: | |
478 | proto = IPPROTO_IPV6; | |
479 | break; | |
480 | default: | |
481 | return err; | |
482 | } | |
483 | break; | |
484 | default: | |
485 | return err; | |
486 | } | |
37dd0247 TH |
487 | |
488 | rcu_read_lock(); | |
489 | offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; | |
490 | ops = rcu_dereference(offloads[proto]); | |
491 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
492 | goto out_unlock; | |
493 | ||
494 | err = ops->callbacks.gro_complete(skb, nhoff + guehlen); | |
495 | ||
229740c6 JR |
496 | skb_set_inner_mac_header(skb, nhoff + guehlen); |
497 | ||
37dd0247 TH |
498 | out_unlock: |
499 | rcu_read_unlock(); | |
500 | return err; | |
501 | } | |
502 | ||
1713cb37 KE |
503 | static bool fou_cfg_cmp(struct fou *fou, struct fou_cfg *cfg) |
504 | { | |
505 | struct sock *sk = fou->sock->sk; | |
506 | struct udp_port_cfg *udp_cfg = &cfg->udp_config; | |
507 | ||
508 | if (fou->family != udp_cfg->family || | |
509 | fou->port != udp_cfg->local_udp_port || | |
510 | sk->sk_dport != udp_cfg->peer_udp_port || | |
511 | sk->sk_bound_dev_if != udp_cfg->bind_ifindex) | |
512 | return false; | |
513 | ||
514 | if (fou->family == AF_INET) { | |
515 | if (sk->sk_rcv_saddr != udp_cfg->local_ip.s_addr || | |
516 | sk->sk_daddr != udp_cfg->peer_ip.s_addr) | |
517 | return false; | |
518 | else | |
519 | return true; | |
520 | #if IS_ENABLED(CONFIG_IPV6) | |
521 | } else { | |
522 | if (ipv6_addr_cmp(&sk->sk_v6_rcv_saddr, &udp_cfg->local_ip6) || | |
523 | ipv6_addr_cmp(&sk->sk_v6_daddr, &udp_cfg->peer_ip6)) | |
524 | return false; | |
525 | else | |
526 | return true; | |
527 | #endif | |
528 | } | |
529 | ||
530 | return false; | |
531 | } | |
532 | ||
533 | static int fou_add_to_port_list(struct net *net, struct fou *fou, | |
534 | struct fou_cfg *cfg) | |
23461551 | 535 | { |
02d793c5 | 536 | struct fou_net *fn = net_generic(net, fou_net_id); |
23461551 TH |
537 | struct fou *fout; |
538 | ||
02d793c5 WC |
539 | mutex_lock(&fn->fou_lock); |
540 | list_for_each_entry(fout, &fn->fou_list, list) { | |
1713cb37 | 541 | if (fou_cfg_cmp(fout, cfg)) { |
02d793c5 | 542 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
543 | return -EALREADY; |
544 | } | |
545 | } | |
546 | ||
02d793c5 WC |
547 | list_add(&fou->list, &fn->fou_list); |
548 | mutex_unlock(&fn->fou_lock); | |
23461551 TH |
549 | |
550 | return 0; | |
551 | } | |
552 | ||
553 | static void fou_release(struct fou *fou) | |
554 | { | |
555 | struct socket *sock = fou->sock; | |
23461551 | 556 | |
23461551 | 557 | list_del(&fou->list); |
02d793c5 | 558 | udp_tunnel_sock_release(sock); |
23461551 | 559 | |
3036facb | 560 | kfree_rcu(fou, rcu); |
23461551 TH |
561 | } |
562 | ||
563 | static int fou_create(struct net *net, struct fou_cfg *cfg, | |
564 | struct socket **sockp) | |
565 | { | |
23461551 | 566 | struct socket *sock = NULL; |
02d793c5 | 567 | struct fou *fou = NULL; |
23461551 | 568 | struct sock *sk; |
440924bb | 569 | struct udp_tunnel_sock_cfg tunnel_cfg; |
02d793c5 | 570 | int err; |
23461551 TH |
571 | |
572 | /* Open UDP socket */ | |
573 | err = udp_sock_create(net, &cfg->udp_config, &sock); | |
574 | if (err < 0) | |
575 | goto error; | |
576 | ||
577 | /* Allocate FOU port structure */ | |
578 | fou = kzalloc(sizeof(*fou), GFP_KERNEL); | |
579 | if (!fou) { | |
580 | err = -ENOMEM; | |
581 | goto error; | |
582 | } | |
583 | ||
584 | sk = sock->sk; | |
585 | ||
37dd0247 | 586 | fou->port = cfg->udp_config.local_udp_port; |
5f914b68 TH |
587 | fou->family = cfg->udp_config.family; |
588 | fou->flags = cfg->flags; | |
440924bb TH |
589 | fou->type = cfg->type; |
590 | fou->sock = sock; | |
591 | ||
592 | memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); | |
593 | tunnel_cfg.encap_type = 1; | |
594 | tunnel_cfg.sk_user_data = fou; | |
595 | tunnel_cfg.encap_destroy = NULL; | |
37dd0247 TH |
596 | |
597 | /* Initial for fou type */ | |
598 | switch (cfg->type) { | |
599 | case FOU_ENCAP_DIRECT: | |
440924bb TH |
600 | tunnel_cfg.encap_rcv = fou_udp_recv; |
601 | tunnel_cfg.gro_receive = fou_gro_receive; | |
602 | tunnel_cfg.gro_complete = fou_gro_complete; | |
603 | fou->protocol = cfg->protocol; | |
37dd0247 TH |
604 | break; |
605 | case FOU_ENCAP_GUE: | |
440924bb TH |
606 | tunnel_cfg.encap_rcv = gue_udp_recv; |
607 | tunnel_cfg.gro_receive = gue_gro_receive; | |
608 | tunnel_cfg.gro_complete = gue_gro_complete; | |
37dd0247 TH |
609 | break; |
610 | default: | |
611 | err = -EINVAL; | |
612 | goto error; | |
613 | } | |
23461551 | 614 | |
440924bb | 615 | setup_udp_tunnel_sock(net, sock, &tunnel_cfg); |
23461551 TH |
616 | |
617 | sk->sk_allocation = GFP_ATOMIC; | |
618 | ||
1713cb37 | 619 | err = fou_add_to_port_list(net, fou, cfg); |
23461551 TH |
620 | if (err) |
621 | goto error; | |
622 | ||
623 | if (sockp) | |
624 | *sockp = sock; | |
625 | ||
626 | return 0; | |
627 | ||
628 | error: | |
629 | kfree(fou); | |
630 | if (sock) | |
02d793c5 | 631 | udp_tunnel_sock_release(sock); |
23461551 TH |
632 | |
633 | return err; | |
634 | } | |
635 | ||
636 | static int fou_destroy(struct net *net, struct fou_cfg *cfg) | |
637 | { | |
02d793c5 | 638 | struct fou_net *fn = net_generic(net, fou_net_id); |
23461551 | 639 | int err = -EINVAL; |
02d793c5 | 640 | struct fou *fou; |
23461551 | 641 | |
02d793c5 WC |
642 | mutex_lock(&fn->fou_lock); |
643 | list_for_each_entry(fou, &fn->fou_list, list) { | |
1713cb37 | 644 | if (fou_cfg_cmp(fou, cfg)) { |
23461551 TH |
645 | fou_release(fou); |
646 | err = 0; | |
647 | break; | |
648 | } | |
649 | } | |
02d793c5 | 650 | mutex_unlock(&fn->fou_lock); |
23461551 TH |
651 | |
652 | return err; | |
653 | } | |
654 | ||
489111e5 | 655 | static struct genl_family fou_nl_family; |
23461551 | 656 | |
3f18ff2b | 657 | static const struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = { |
1713cb37 KE |
658 | [FOU_ATTR_PORT] = { .type = NLA_U16, }, |
659 | [FOU_ATTR_AF] = { .type = NLA_U8, }, | |
660 | [FOU_ATTR_IPPROTO] = { .type = NLA_U8, }, | |
661 | [FOU_ATTR_TYPE] = { .type = NLA_U8, }, | |
662 | [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, }, | |
663 | [FOU_ATTR_LOCAL_V4] = { .type = NLA_U32, }, | |
664 | [FOU_ATTR_PEER_V4] = { .type = NLA_U32, }, | |
2377d9d0 KE |
665 | [FOU_ATTR_LOCAL_V6] = { .len = sizeof(struct in6_addr), }, |
666 | [FOU_ATTR_PEER_V6] = { .len = sizeof(struct in6_addr), }, | |
1713cb37 KE |
667 | [FOU_ATTR_PEER_PORT] = { .type = NLA_U16, }, |
668 | [FOU_ATTR_IFINDEX] = { .type = NLA_S32, }, | |
23461551 TH |
669 | }; |
670 | ||
671 | static int parse_nl_config(struct genl_info *info, | |
672 | struct fou_cfg *cfg) | |
673 | { | |
1713cb37 KE |
674 | bool has_local = false, has_peer = false; |
675 | struct nlattr *attr; | |
676 | int ifindex; | |
677 | __be16 port; | |
678 | ||
23461551 TH |
679 | memset(cfg, 0, sizeof(*cfg)); |
680 | ||
681 | cfg->udp_config.family = AF_INET; | |
682 | ||
683 | if (info->attrs[FOU_ATTR_AF]) { | |
684 | u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]); | |
685 | ||
5f914b68 TH |
686 | switch (family) { |
687 | case AF_INET: | |
688 | break; | |
689 | case AF_INET6: | |
690 | cfg->udp_config.ipv6_v6only = 1; | |
691 | break; | |
692 | default: | |
693 | return -EAFNOSUPPORT; | |
694 | } | |
23461551 TH |
695 | |
696 | cfg->udp_config.family = family; | |
697 | } | |
698 | ||
699 | if (info->attrs[FOU_ATTR_PORT]) { | |
1713cb37 | 700 | port = nla_get_be16(info->attrs[FOU_ATTR_PORT]); |
23461551 TH |
701 | cfg->udp_config.local_udp_port = port; |
702 | } | |
703 | ||
704 | if (info->attrs[FOU_ATTR_IPPROTO]) | |
705 | cfg->protocol = nla_get_u8(info->attrs[FOU_ATTR_IPPROTO]); | |
706 | ||
37dd0247 TH |
707 | if (info->attrs[FOU_ATTR_TYPE]) |
708 | cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]); | |
709 | ||
fe881ef1 TH |
710 | if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL]) |
711 | cfg->flags |= FOU_F_REMCSUM_NOPARTIAL; | |
712 | ||
1713cb37 KE |
713 | if (cfg->udp_config.family == AF_INET) { |
714 | if (info->attrs[FOU_ATTR_LOCAL_V4]) { | |
715 | attr = info->attrs[FOU_ATTR_LOCAL_V4]; | |
716 | cfg->udp_config.local_ip.s_addr = nla_get_in_addr(attr); | |
717 | has_local = true; | |
718 | } | |
719 | ||
720 | if (info->attrs[FOU_ATTR_PEER_V4]) { | |
721 | attr = info->attrs[FOU_ATTR_PEER_V4]; | |
722 | cfg->udp_config.peer_ip.s_addr = nla_get_in_addr(attr); | |
723 | has_peer = true; | |
724 | } | |
725 | #if IS_ENABLED(CONFIG_IPV6) | |
726 | } else { | |
727 | if (info->attrs[FOU_ATTR_LOCAL_V6]) { | |
728 | attr = info->attrs[FOU_ATTR_LOCAL_V6]; | |
729 | cfg->udp_config.local_ip6 = nla_get_in6_addr(attr); | |
730 | has_local = true; | |
731 | } | |
732 | ||
733 | if (info->attrs[FOU_ATTR_PEER_V6]) { | |
734 | attr = info->attrs[FOU_ATTR_PEER_V6]; | |
735 | cfg->udp_config.peer_ip6 = nla_get_in6_addr(attr); | |
736 | has_peer = true; | |
737 | } | |
738 | #endif | |
739 | } | |
740 | ||
741 | if (has_peer) { | |
742 | if (info->attrs[FOU_ATTR_PEER_PORT]) { | |
743 | port = nla_get_be16(info->attrs[FOU_ATTR_PEER_PORT]); | |
744 | cfg->udp_config.peer_udp_port = port; | |
745 | } else { | |
746 | return -EINVAL; | |
747 | } | |
748 | } | |
749 | ||
750 | if (info->attrs[FOU_ATTR_IFINDEX]) { | |
751 | if (!has_local) | |
752 | return -EINVAL; | |
753 | ||
754 | ifindex = nla_get_s32(info->attrs[FOU_ATTR_IFINDEX]); | |
755 | ||
756 | cfg->udp_config.bind_ifindex = ifindex; | |
757 | } | |
758 | ||
23461551 TH |
759 | return 0; |
760 | } | |
761 | ||
762 | static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info) | |
763 | { | |
02d793c5 | 764 | struct net *net = genl_info_net(info); |
23461551 TH |
765 | struct fou_cfg cfg; |
766 | int err; | |
767 | ||
768 | err = parse_nl_config(info, &cfg); | |
769 | if (err) | |
770 | return err; | |
771 | ||
02d793c5 | 772 | return fou_create(net, &cfg, NULL); |
23461551 TH |
773 | } |
774 | ||
775 | static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info) | |
776 | { | |
02d793c5 | 777 | struct net *net = genl_info_net(info); |
23461551 | 778 | struct fou_cfg cfg; |
67270636 | 779 | int err; |
23461551 | 780 | |
67270636 WC |
781 | err = parse_nl_config(info, &cfg); |
782 | if (err) | |
783 | return err; | |
23461551 | 784 | |
02d793c5 | 785 | return fou_destroy(net, &cfg); |
23461551 TH |
786 | } |
787 | ||
7a6c8c34 WC |
788 | static int fou_fill_info(struct fou *fou, struct sk_buff *msg) |
789 | { | |
1713cb37 KE |
790 | struct sock *sk = fou->sock->sk; |
791 | ||
7a6c8c34 WC |
792 | if (nla_put_u8(msg, FOU_ATTR_AF, fou->sock->sk->sk_family) || |
793 | nla_put_be16(msg, FOU_ATTR_PORT, fou->port) || | |
1713cb37 | 794 | nla_put_be16(msg, FOU_ATTR_PEER_PORT, sk->sk_dport) || |
7a6c8c34 | 795 | nla_put_u8(msg, FOU_ATTR_IPPROTO, fou->protocol) || |
1713cb37 KE |
796 | nla_put_u8(msg, FOU_ATTR_TYPE, fou->type) || |
797 | nla_put_s32(msg, FOU_ATTR_IFINDEX, sk->sk_bound_dev_if)) | |
7a6c8c34 WC |
798 | return -1; |
799 | ||
800 | if (fou->flags & FOU_F_REMCSUM_NOPARTIAL) | |
801 | if (nla_put_flag(msg, FOU_ATTR_REMCSUM_NOPARTIAL)) | |
802 | return -1; | |
1713cb37 KE |
803 | |
804 | if (fou->sock->sk->sk_family == AF_INET) { | |
805 | if (nla_put_in_addr(msg, FOU_ATTR_LOCAL_V4, sk->sk_rcv_saddr)) | |
806 | return -1; | |
807 | ||
808 | if (nla_put_in_addr(msg, FOU_ATTR_PEER_V4, sk->sk_daddr)) | |
809 | return -1; | |
810 | #if IS_ENABLED(CONFIG_IPV6) | |
811 | } else { | |
812 | if (nla_put_in6_addr(msg, FOU_ATTR_LOCAL_V6, | |
813 | &sk->sk_v6_rcv_saddr)) | |
814 | return -1; | |
815 | ||
816 | if (nla_put_in6_addr(msg, FOU_ATTR_PEER_V6, &sk->sk_v6_daddr)) | |
817 | return -1; | |
818 | #endif | |
819 | } | |
820 | ||
7a6c8c34 WC |
821 | return 0; |
822 | } | |
823 | ||
824 | static int fou_dump_info(struct fou *fou, u32 portid, u32 seq, | |
825 | u32 flags, struct sk_buff *skb, u8 cmd) | |
826 | { | |
827 | void *hdr; | |
828 | ||
829 | hdr = genlmsg_put(skb, portid, seq, &fou_nl_family, flags, cmd); | |
830 | if (!hdr) | |
831 | return -ENOMEM; | |
832 | ||
833 | if (fou_fill_info(fou, skb) < 0) | |
834 | goto nla_put_failure; | |
835 | ||
836 | genlmsg_end(skb, hdr); | |
837 | return 0; | |
838 | ||
839 | nla_put_failure: | |
840 | genlmsg_cancel(skb, hdr); | |
841 | return -EMSGSIZE; | |
842 | } | |
843 | ||
844 | static int fou_nl_cmd_get_port(struct sk_buff *skb, struct genl_info *info) | |
845 | { | |
846 | struct net *net = genl_info_net(info); | |
847 | struct fou_net *fn = net_generic(net, fou_net_id); | |
848 | struct sk_buff *msg; | |
849 | struct fou_cfg cfg; | |
850 | struct fou *fout; | |
851 | __be16 port; | |
5f914b68 | 852 | u8 family; |
7a6c8c34 WC |
853 | int ret; |
854 | ||
855 | ret = parse_nl_config(info, &cfg); | |
856 | if (ret) | |
857 | return ret; | |
858 | port = cfg.udp_config.local_udp_port; | |
859 | if (port == 0) | |
860 | return -EINVAL; | |
861 | ||
5f914b68 TH |
862 | family = cfg.udp_config.family; |
863 | if (family != AF_INET && family != AF_INET6) | |
864 | return -EINVAL; | |
865 | ||
7a6c8c34 WC |
866 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
867 | if (!msg) | |
868 | return -ENOMEM; | |
869 | ||
870 | ret = -ESRCH; | |
871 | mutex_lock(&fn->fou_lock); | |
872 | list_for_each_entry(fout, &fn->fou_list, list) { | |
1713cb37 | 873 | if (fou_cfg_cmp(fout, &cfg)) { |
7a6c8c34 WC |
874 | ret = fou_dump_info(fout, info->snd_portid, |
875 | info->snd_seq, 0, msg, | |
876 | info->genlhdr->cmd); | |
877 | break; | |
878 | } | |
879 | } | |
880 | mutex_unlock(&fn->fou_lock); | |
881 | if (ret < 0) | |
882 | goto out_free; | |
883 | ||
884 | return genlmsg_reply(msg, info); | |
885 | ||
886 | out_free: | |
887 | nlmsg_free(msg); | |
888 | return ret; | |
889 | } | |
890 | ||
891 | static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
892 | { | |
893 | struct net *net = sock_net(skb->sk); | |
894 | struct fou_net *fn = net_generic(net, fou_net_id); | |
895 | struct fou *fout; | |
896 | int idx = 0, ret; | |
897 | ||
898 | mutex_lock(&fn->fou_lock); | |
899 | list_for_each_entry(fout, &fn->fou_list, list) { | |
900 | if (idx++ < cb->args[0]) | |
901 | continue; | |
902 | ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid, | |
903 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
904 | skb, FOU_CMD_GET); | |
905 | if (ret) | |
540207ae | 906 | break; |
7a6c8c34 WC |
907 | } |
908 | mutex_unlock(&fn->fou_lock); | |
909 | ||
7a6c8c34 WC |
910 | cb->args[0] = idx; |
911 | return skb->len; | |
912 | } | |
913 | ||
23461551 TH |
914 | static const struct genl_ops fou_nl_ops[] = { |
915 | { | |
916 | .cmd = FOU_CMD_ADD, | |
ef6243ac | 917 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
23461551 | 918 | .doit = fou_nl_cmd_add_port, |
23461551 TH |
919 | .flags = GENL_ADMIN_PERM, |
920 | }, | |
921 | { | |
922 | .cmd = FOU_CMD_DEL, | |
ef6243ac | 923 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
23461551 | 924 | .doit = fou_nl_cmd_rm_port, |
23461551 TH |
925 | .flags = GENL_ADMIN_PERM, |
926 | }, | |
7a6c8c34 WC |
927 | { |
928 | .cmd = FOU_CMD_GET, | |
ef6243ac | 929 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
7a6c8c34 WC |
930 | .doit = fou_nl_cmd_get_port, |
931 | .dumpit = fou_nl_dump, | |
7a6c8c34 | 932 | }, |
23461551 TH |
933 | }; |
934 | ||
56989f6d | 935 | static struct genl_family fou_nl_family __ro_after_init = { |
489111e5 JB |
936 | .hdrsize = 0, |
937 | .name = FOU_GENL_NAME, | |
938 | .version = FOU_GENL_VERSION, | |
939 | .maxattr = FOU_ATTR_MAX, | |
3b0f31f2 | 940 | .policy = fou_nl_policy, |
489111e5 JB |
941 | .netnsok = true, |
942 | .module = THIS_MODULE, | |
943 | .ops = fou_nl_ops, | |
944 | .n_ops = ARRAY_SIZE(fou_nl_ops), | |
945 | }; | |
946 | ||
a8c5f90f TH |
947 | size_t fou_encap_hlen(struct ip_tunnel_encap *e) |
948 | { | |
949 | return sizeof(struct udphdr); | |
950 | } | |
951 | EXPORT_SYMBOL(fou_encap_hlen); | |
952 | ||
953 | size_t gue_encap_hlen(struct ip_tunnel_encap *e) | |
954 | { | |
955 | size_t len; | |
956 | bool need_priv = false; | |
957 | ||
958 | len = sizeof(struct udphdr) + sizeof(struct guehdr); | |
959 | ||
960 | if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) { | |
961 | len += GUE_PLEN_REMCSUM; | |
962 | need_priv = true; | |
963 | } | |
964 | ||
965 | len += need_priv ? GUE_LEN_PRIV : 0; | |
966 | ||
967 | return len; | |
968 | } | |
969 | EXPORT_SYMBOL(gue_encap_hlen); | |
970 | ||
dc969b81 TH |
971 | int __fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, |
972 | u8 *protocol, __be16 *sport, int type) | |
973 | { | |
974 | int err; | |
975 | ||
976 | err = iptunnel_handle_offloads(skb, type); | |
977 | if (err) | |
978 | return err; | |
979 | ||
980 | *sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), | |
981 | skb, 0, 0, false); | |
982 | ||
983 | return 0; | |
984 | } | |
985 | EXPORT_SYMBOL(__fou_build_header); | |
986 | ||
dc969b81 TH |
987 | int __gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, |
988 | u8 *protocol, __be16 *sport, int type) | |
63487bab | 989 | { |
63487bab | 990 | struct guehdr *guehdr; |
b17f709a | 991 | size_t hdrlen, optlen = 0; |
5024c33a TH |
992 | void *data; |
993 | bool need_priv = false; | |
aed069df | 994 | int err; |
5024c33a | 995 | |
b17f709a TH |
996 | if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) && |
997 | skb->ip_summed == CHECKSUM_PARTIAL) { | |
b17f709a TH |
998 | optlen += GUE_PLEN_REMCSUM; |
999 | type |= SKB_GSO_TUNNEL_REMCSUM; | |
1000 | need_priv = true; | |
1001 | } | |
1002 | ||
5024c33a | 1003 | optlen += need_priv ? GUE_LEN_PRIV : 0; |
63487bab | 1004 | |
aed069df AD |
1005 | err = iptunnel_handle_offloads(skb, type); |
1006 | if (err) | |
1007 | return err; | |
63487bab TH |
1008 | |
1009 | /* Get source port (based on flow hash) before skb_push */ | |
dc969b81 TH |
1010 | *sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev), |
1011 | skb, 0, 0, false); | |
63487bab | 1012 | |
b17f709a TH |
1013 | hdrlen = sizeof(struct guehdr) + optlen; |
1014 | ||
1015 | skb_push(skb, hdrlen); | |
63487bab TH |
1016 | |
1017 | guehdr = (struct guehdr *)skb->data; | |
1018 | ||
5024c33a | 1019 | guehdr->control = 0; |
63487bab | 1020 | guehdr->version = 0; |
5024c33a | 1021 | guehdr->hlen = optlen >> 2; |
63487bab | 1022 | guehdr->flags = 0; |
5024c33a TH |
1023 | guehdr->proto_ctype = *protocol; |
1024 | ||
1025 | data = &guehdr[1]; | |
1026 | ||
1027 | if (need_priv) { | |
1028 | __be32 *flags = data; | |
1029 | ||
1030 | guehdr->flags |= GUE_FLAG_PRIV; | |
1031 | *flags = 0; | |
1032 | data += GUE_LEN_PRIV; | |
1033 | ||
b17f709a TH |
1034 | if (type & SKB_GSO_TUNNEL_REMCSUM) { |
1035 | u16 csum_start = skb_checksum_start_offset(skb); | |
1036 | __be16 *pd = data; | |
1037 | ||
1038 | if (csum_start < hdrlen) | |
1039 | return -EINVAL; | |
1040 | ||
1041 | csum_start -= hdrlen; | |
1042 | pd[0] = htons(csum_start); | |
1043 | pd[1] = htons(csum_start + skb->csum_offset); | |
1044 | ||
1045 | if (!skb_is_gso(skb)) { | |
1046 | skb->ip_summed = CHECKSUM_NONE; | |
1047 | skb->encapsulation = 0; | |
1048 | } | |
1049 | ||
1050 | *flags |= GUE_PFLAG_REMCSUM; | |
1051 | data += GUE_PLEN_REMCSUM; | |
1052 | } | |
1053 | ||
5024c33a | 1054 | } |
63487bab | 1055 | |
dc969b81 TH |
1056 | return 0; |
1057 | } | |
1058 | EXPORT_SYMBOL(__gue_build_header); | |
1059 | ||
9dc621af | 1060 | #ifdef CONFIG_NET_FOU_IP_TUNNELS |
1061 | ||
1062 | static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
1063 | struct flowi4 *fl4, u8 *protocol, __be16 sport) | |
1064 | { | |
1065 | struct udphdr *uh; | |
1066 | ||
1067 | skb_push(skb, sizeof(struct udphdr)); | |
1068 | skb_reset_transport_header(skb); | |
1069 | ||
1070 | uh = udp_hdr(skb); | |
1071 | ||
1072 | uh->dest = e->dport; | |
1073 | uh->source = sport; | |
1074 | uh->len = htons(skb->len); | |
1075 | udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb, | |
1076 | fl4->saddr, fl4->daddr, skb->len); | |
1077 | ||
1078 | *protocol = IPPROTO_UDP; | |
1079 | } | |
1080 | ||
1081 | static int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
1082 | u8 *protocol, struct flowi4 *fl4) | |
1083 | { | |
1084 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM : | |
1085 | SKB_GSO_UDP_TUNNEL; | |
1086 | __be16 sport; | |
1087 | int err; | |
1088 | ||
1089 | err = __fou_build_header(skb, e, protocol, &sport, type); | |
1090 | if (err) | |
1091 | return err; | |
1092 | ||
1093 | fou_build_udp(skb, e, fl4, protocol, sport); | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | static int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
1099 | u8 *protocol, struct flowi4 *fl4) | |
dc969b81 TH |
1100 | { |
1101 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM : | |
1102 | SKB_GSO_UDP_TUNNEL; | |
1103 | __be16 sport; | |
1104 | int err; | |
1105 | ||
1106 | err = __gue_build_header(skb, e, protocol, &sport, type); | |
1107 | if (err) | |
1108 | return err; | |
1109 | ||
63487bab TH |
1110 | fou_build_udp(skb, e, fl4, protocol, sport); |
1111 | ||
1112 | return 0; | |
1113 | } | |
63487bab | 1114 | |
b8a51b38 SB |
1115 | static int gue_err_proto_handler(int proto, struct sk_buff *skb, u32 info) |
1116 | { | |
1117 | const struct net_protocol *ipprot = rcu_dereference(inet_protos[proto]); | |
1118 | ||
1119 | if (ipprot && ipprot->err_handler) { | |
1120 | if (!ipprot->err_handler(skb, info)) | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | return -ENOENT; | |
1125 | } | |
1126 | ||
1127 | static int gue_err(struct sk_buff *skb, u32 info) | |
1128 | { | |
1129 | int transport_offset = skb_transport_offset(skb); | |
1130 | struct guehdr *guehdr; | |
26fc181e | 1131 | size_t len, optlen; |
b8a51b38 SB |
1132 | int ret; |
1133 | ||
26fc181e | 1134 | len = sizeof(struct udphdr) + sizeof(struct guehdr); |
5355ed63 | 1135 | if (!pskb_may_pull(skb, transport_offset + len)) |
b8a51b38 SB |
1136 | return -EINVAL; |
1137 | ||
1138 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
1139 | ||
1140 | switch (guehdr->version) { | |
1141 | case 0: /* Full GUE header present */ | |
1142 | break; | |
1143 | case 1: { | |
c9d52f21 | 1144 | /* Direct encapsulation of IPv4 or IPv6 */ |
b8a51b38 SB |
1145 | skb_set_transport_header(skb, -(int)sizeof(struct icmphdr)); |
1146 | ||
1147 | switch (((struct iphdr *)guehdr)->version) { | |
1148 | case 4: | |
1149 | ret = gue_err_proto_handler(IPPROTO_IPIP, skb, info); | |
1150 | goto out; | |
1151 | #if IS_ENABLED(CONFIG_IPV6) | |
1152 | case 6: | |
1153 | ret = gue_err_proto_handler(IPPROTO_IPV6, skb, info); | |
1154 | goto out; | |
1155 | #endif | |
1156 | default: | |
1157 | ret = -EOPNOTSUPP; | |
1158 | goto out; | |
1159 | } | |
1160 | } | |
1161 | default: /* Undefined version */ | |
1162 | return -EOPNOTSUPP; | |
1163 | } | |
1164 | ||
1165 | if (guehdr->control) | |
1166 | return -ENOENT; | |
1167 | ||
1168 | optlen = guehdr->hlen << 2; | |
1169 | ||
5355ed63 | 1170 | if (!pskb_may_pull(skb, transport_offset + len + optlen)) |
26fc181e ED |
1171 | return -EINVAL; |
1172 | ||
1173 | guehdr = (struct guehdr *)&udp_hdr(skb)[1]; | |
b8a51b38 SB |
1174 | if (validate_gue_flags(guehdr, optlen)) |
1175 | return -EINVAL; | |
1176 | ||
11789039 SB |
1177 | /* Handling exceptions for direct UDP encapsulation in GUE would lead to |
1178 | * recursion. Besides, this kind of encapsulation can't even be | |
1179 | * configured currently. Discard this. | |
1180 | */ | |
bc6e019b SB |
1181 | if (guehdr->proto_ctype == IPPROTO_UDP || |
1182 | guehdr->proto_ctype == IPPROTO_UDPLITE) | |
11789039 SB |
1183 | return -EOPNOTSUPP; |
1184 | ||
b8a51b38 SB |
1185 | skb_set_transport_header(skb, -(int)sizeof(struct icmphdr)); |
1186 | ret = gue_err_proto_handler(guehdr->proto_ctype, skb, info); | |
1187 | ||
1188 | out: | |
1189 | skb_set_transport_header(skb, transport_offset); | |
1190 | return ret; | |
1191 | } | |
1192 | ||
a8c5f90f | 1193 | |
5eeb2922 | 1194 | static const struct ip_tunnel_encap_ops fou_iptun_ops = { |
a8c5f90f TH |
1195 | .encap_hlen = fou_encap_hlen, |
1196 | .build_header = fou_build_header, | |
b8a51b38 | 1197 | .err_handler = gue_err, |
a8c5f90f TH |
1198 | }; |
1199 | ||
5eeb2922 | 1200 | static const struct ip_tunnel_encap_ops gue_iptun_ops = { |
a8c5f90f TH |
1201 | .encap_hlen = gue_encap_hlen, |
1202 | .build_header = gue_build_header, | |
b8a51b38 | 1203 | .err_handler = gue_err, |
a8c5f90f TH |
1204 | }; |
1205 | ||
1206 | static int ip_tunnel_encap_add_fou_ops(void) | |
1207 | { | |
1208 | int ret; | |
1209 | ||
1210 | ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
1211 | if (ret < 0) { | |
1212 | pr_err("can't add fou ops\n"); | |
1213 | return ret; | |
1214 | } | |
1215 | ||
1216 | ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
1217 | if (ret < 0) { | |
1218 | pr_err("can't add gue ops\n"); | |
1219 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
1220 | return ret; | |
1221 | } | |
1222 | ||
1223 | return 0; | |
1224 | } | |
1225 | ||
1226 | static void ip_tunnel_encap_del_fou_ops(void) | |
1227 | { | |
1228 | ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU); | |
1229 | ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); | |
1230 | } | |
1231 | ||
1232 | #else | |
1233 | ||
1234 | static int ip_tunnel_encap_add_fou_ops(void) | |
1235 | { | |
1236 | return 0; | |
1237 | } | |
1238 | ||
882288c0 | 1239 | static void ip_tunnel_encap_del_fou_ops(void) |
a8c5f90f TH |
1240 | { |
1241 | } | |
1242 | ||
1243 | #endif | |
1244 | ||
02d793c5 WC |
1245 | static __net_init int fou_init_net(struct net *net) |
1246 | { | |
1247 | struct fou_net *fn = net_generic(net, fou_net_id); | |
1248 | ||
1249 | INIT_LIST_HEAD(&fn->fou_list); | |
1250 | mutex_init(&fn->fou_lock); | |
1251 | return 0; | |
1252 | } | |
1253 | ||
1254 | static __net_exit void fou_exit_net(struct net *net) | |
1255 | { | |
1256 | struct fou_net *fn = net_generic(net, fou_net_id); | |
1257 | struct fou *fou, *next; | |
1258 | ||
1259 | /* Close all the FOU sockets */ | |
1260 | mutex_lock(&fn->fou_lock); | |
1261 | list_for_each_entry_safe(fou, next, &fn->fou_list, list) | |
1262 | fou_release(fou); | |
1263 | mutex_unlock(&fn->fou_lock); | |
1264 | } | |
1265 | ||
1266 | static struct pernet_operations fou_net_ops = { | |
1267 | .init = fou_init_net, | |
1268 | .exit = fou_exit_net, | |
1269 | .id = &fou_net_id, | |
1270 | .size = sizeof(struct fou_net), | |
1271 | }; | |
1272 | ||
23461551 TH |
1273 | static int __init fou_init(void) |
1274 | { | |
1275 | int ret; | |
1276 | ||
02d793c5 WC |
1277 | ret = register_pernet_device(&fou_net_ops); |
1278 | if (ret) | |
1279 | goto exit; | |
1280 | ||
489111e5 | 1281 | ret = genl_register_family(&fou_nl_family); |
a8c5f90f | 1282 | if (ret < 0) |
02d793c5 | 1283 | goto unregister; |
a8c5f90f TH |
1284 | |
1285 | ret = ip_tunnel_encap_add_fou_ops(); | |
02d793c5 WC |
1286 | if (ret == 0) |
1287 | return 0; | |
a8c5f90f | 1288 | |
02d793c5 WC |
1289 | genl_unregister_family(&fou_nl_family); |
1290 | unregister: | |
1291 | unregister_pernet_device(&fou_net_ops); | |
a8c5f90f | 1292 | exit: |
23461551 TH |
1293 | return ret; |
1294 | } | |
1295 | ||
1296 | static void __exit fou_fini(void) | |
1297 | { | |
a8c5f90f | 1298 | ip_tunnel_encap_del_fou_ops(); |
23461551 | 1299 | genl_unregister_family(&fou_nl_family); |
02d793c5 | 1300 | unregister_pernet_device(&fou_net_ops); |
23461551 TH |
1301 | } |
1302 | ||
1303 | module_init(fou_init); | |
1304 | module_exit(fou_fini); | |
1305 | MODULE_AUTHOR("Tom Herbert <therbert@google.com>"); | |
1306 | MODULE_LICENSE("GPL"); |