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2303f994 PK |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Multipath TCP | |
3 | * | |
4 | * Copyright (c) 2017 - 2019, Intel Corporation. | |
5 | */ | |
6 | ||
79c0949e PK |
7 | #define pr_fmt(fmt) "MPTCP: " fmt |
8 | ||
2303f994 PK |
9 | #include <linux/kernel.h> |
10 | #include <linux/module.h> | |
11 | #include <linux/netdevice.h> | |
f296234c | 12 | #include <crypto/algapi.h> |
2303f994 PK |
13 | #include <net/sock.h> |
14 | #include <net/inet_common.h> | |
15 | #include <net/inet_hashtables.h> | |
16 | #include <net/protocol.h> | |
17 | #include <net/tcp.h> | |
cec37a6e PK |
18 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
19 | #include <net/ip6_route.h> | |
20 | #endif | |
2303f994 PK |
21 | #include <net/mptcp.h> |
22 | #include "protocol.h" | |
23 | ||
79c0949e PK |
24 | static int subflow_rebuild_header(struct sock *sk) |
25 | { | |
26 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
ec3edaa7 | 27 | int local_id, err = 0; |
79c0949e PK |
28 | |
29 | if (subflow->request_mptcp && !subflow->token) { | |
30 | pr_debug("subflow=%p", sk); | |
31 | err = mptcp_token_new_connect(sk); | |
ec3edaa7 PK |
32 | } else if (subflow->request_join && !subflow->local_nonce) { |
33 | struct mptcp_sock *msk = (struct mptcp_sock *)subflow->conn; | |
34 | ||
35 | pr_debug("subflow=%p", sk); | |
36 | ||
37 | do { | |
38 | get_random_bytes(&subflow->local_nonce, sizeof(u32)); | |
39 | } while (!subflow->local_nonce); | |
40 | ||
41 | if (subflow->local_id) | |
42 | goto out; | |
43 | ||
44 | local_id = mptcp_pm_get_local_id(msk, (struct sock_common *)sk); | |
45 | if (local_id < 0) | |
46 | return -EINVAL; | |
47 | ||
48 | subflow->local_id = local_id; | |
79c0949e PK |
49 | } |
50 | ||
ec3edaa7 | 51 | out: |
79c0949e PK |
52 | if (err) |
53 | return err; | |
54 | ||
55 | return subflow->icsk_af_ops->rebuild_header(sk); | |
56 | } | |
57 | ||
58 | static void subflow_req_destructor(struct request_sock *req) | |
59 | { | |
60 | struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req); | |
61 | ||
62 | pr_debug("subflow_req=%p", subflow_req); | |
63 | ||
64 | if (subflow_req->mp_capable) | |
65 | mptcp_token_destroy_request(subflow_req->token); | |
66 | tcp_request_sock_ops.destructor(req); | |
67 | } | |
68 | ||
f296234c PK |
69 | static void subflow_generate_hmac(u64 key1, u64 key2, u32 nonce1, u32 nonce2, |
70 | void *hmac) | |
71 | { | |
72 | u8 msg[8]; | |
73 | ||
74 | put_unaligned_be32(nonce1, &msg[0]); | |
75 | put_unaligned_be32(nonce2, &msg[4]); | |
76 | ||
77 | mptcp_crypto_hmac_sha(key1, key2, msg, 8, hmac); | |
78 | } | |
79 | ||
80 | /* validate received token and create truncated hmac and nonce for SYN-ACK */ | |
81 | static bool subflow_token_join_request(struct request_sock *req, | |
82 | const struct sk_buff *skb) | |
83 | { | |
84 | struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req); | |
85 | u8 hmac[MPTCPOPT_HMAC_LEN]; | |
86 | struct mptcp_sock *msk; | |
87 | int local_id; | |
88 | ||
89 | msk = mptcp_token_get_sock(subflow_req->token); | |
90 | if (!msk) { | |
91 | pr_debug("subflow_req=%p, token=%u - not found\n", | |
92 | subflow_req, subflow_req->token); | |
93 | return false; | |
94 | } | |
95 | ||
96 | local_id = mptcp_pm_get_local_id(msk, (struct sock_common *)req); | |
97 | if (local_id < 0) { | |
98 | sock_put((struct sock *)msk); | |
99 | return false; | |
100 | } | |
101 | subflow_req->local_id = local_id; | |
102 | ||
103 | get_random_bytes(&subflow_req->local_nonce, sizeof(u32)); | |
104 | ||
105 | subflow_generate_hmac(msk->local_key, msk->remote_key, | |
106 | subflow_req->local_nonce, | |
107 | subflow_req->remote_nonce, hmac); | |
108 | ||
109 | subflow_req->thmac = get_unaligned_be64(hmac); | |
110 | ||
111 | sock_put((struct sock *)msk); | |
112 | return true; | |
113 | } | |
114 | ||
cec37a6e PK |
115 | static void subflow_init_req(struct request_sock *req, |
116 | const struct sock *sk_listener, | |
117 | struct sk_buff *skb) | |
118 | { | |
119 | struct mptcp_subflow_context *listener = mptcp_subflow_ctx(sk_listener); | |
120 | struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req); | |
121 | struct tcp_options_received rx_opt; | |
122 | ||
123 | pr_debug("subflow_req=%p, listener=%p", subflow_req, listener); | |
124 | ||
125 | memset(&rx_opt.mptcp, 0, sizeof(rx_opt.mptcp)); | |
126 | mptcp_get_options(skb, &rx_opt); | |
127 | ||
128 | subflow_req->mp_capable = 0; | |
f296234c | 129 | subflow_req->mp_join = 0; |
d22f4988 | 130 | subflow_req->remote_key_valid = 0; |
cec37a6e PK |
131 | |
132 | #ifdef CONFIG_TCP_MD5SIG | |
133 | /* no MPTCP if MD5SIG is enabled on this socket or we may run out of | |
134 | * TCP option space. | |
135 | */ | |
136 | if (rcu_access_pointer(tcp_sk(sk_listener)->md5sig_info)) | |
137 | return; | |
138 | #endif | |
139 | ||
f296234c PK |
140 | if (rx_opt.mptcp.mp_capable && rx_opt.mptcp.mp_join) |
141 | return; | |
142 | ||
cec37a6e | 143 | if (rx_opt.mptcp.mp_capable && listener->request_mptcp) { |
79c0949e PK |
144 | int err; |
145 | ||
146 | err = mptcp_token_new_request(req); | |
147 | if (err == 0) | |
148 | subflow_req->mp_capable = 1; | |
149 | ||
648ef4b8 | 150 | subflow_req->ssn_offset = TCP_SKB_CB(skb)->seq; |
f296234c | 151 | } else if (rx_opt.mptcp.mp_join && listener->request_mptcp) { |
ec3edaa7 | 152 | subflow_req->ssn_offset = TCP_SKB_CB(skb)->seq; |
f296234c PK |
153 | subflow_req->mp_join = 1; |
154 | subflow_req->backup = rx_opt.mptcp.backup; | |
155 | subflow_req->remote_id = rx_opt.mptcp.join_id; | |
156 | subflow_req->token = rx_opt.mptcp.token; | |
157 | subflow_req->remote_nonce = rx_opt.mptcp.nonce; | |
158 | pr_debug("token=%u, remote_nonce=%u", subflow_req->token, | |
159 | subflow_req->remote_nonce); | |
160 | if (!subflow_token_join_request(req, skb)) { | |
161 | subflow_req->mp_join = 0; | |
162 | // @@ need to trigger RST | |
163 | } | |
cec37a6e PK |
164 | } |
165 | } | |
166 | ||
167 | static void subflow_v4_init_req(struct request_sock *req, | |
168 | const struct sock *sk_listener, | |
169 | struct sk_buff *skb) | |
170 | { | |
171 | tcp_rsk(req)->is_mptcp = 1; | |
172 | ||
173 | tcp_request_sock_ipv4_ops.init_req(req, sk_listener, skb); | |
174 | ||
175 | subflow_init_req(req, sk_listener, skb); | |
176 | } | |
177 | ||
178 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
179 | static void subflow_v6_init_req(struct request_sock *req, | |
180 | const struct sock *sk_listener, | |
181 | struct sk_buff *skb) | |
182 | { | |
183 | tcp_rsk(req)->is_mptcp = 1; | |
184 | ||
185 | tcp_request_sock_ipv6_ops.init_req(req, sk_listener, skb); | |
186 | ||
187 | subflow_init_req(req, sk_listener, skb); | |
188 | } | |
189 | #endif | |
190 | ||
ec3edaa7 PK |
191 | /* validate received truncated hmac and create hmac for third ACK */ |
192 | static bool subflow_thmac_valid(struct mptcp_subflow_context *subflow) | |
193 | { | |
194 | u8 hmac[MPTCPOPT_HMAC_LEN]; | |
195 | u64 thmac; | |
196 | ||
197 | subflow_generate_hmac(subflow->remote_key, subflow->local_key, | |
198 | subflow->remote_nonce, subflow->local_nonce, | |
199 | hmac); | |
200 | ||
201 | thmac = get_unaligned_be64(hmac); | |
202 | pr_debug("subflow=%p, token=%u, thmac=%llu, subflow->thmac=%llu\n", | |
203 | subflow, subflow->token, | |
204 | (unsigned long long)thmac, | |
205 | (unsigned long long)subflow->thmac); | |
206 | ||
207 | return thmac == subflow->thmac; | |
208 | } | |
209 | ||
cec37a6e PK |
210 | static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb) |
211 | { | |
212 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
c3c123d1 | 213 | struct sock *parent = subflow->conn; |
cec37a6e PK |
214 | |
215 | subflow->icsk_af_ops->sk_rx_dst_set(sk, skb); | |
216 | ||
c3c123d1 DC |
217 | if (inet_sk_state_load(parent) != TCP_ESTABLISHED) { |
218 | inet_sk_state_store(parent, TCP_ESTABLISHED); | |
219 | parent->sk_state_change(parent); | |
220 | } | |
221 | ||
ec3edaa7 PK |
222 | if (subflow->conn_finished || !tcp_sk(sk)->is_mptcp) |
223 | return; | |
224 | ||
225 | if (subflow->mp_capable) { | |
cec37a6e PK |
226 | pr_debug("subflow=%p, remote_key=%llu", mptcp_subflow_ctx(sk), |
227 | subflow->remote_key); | |
228 | mptcp_finish_connect(sk); | |
229 | subflow->conn_finished = 1; | |
648ef4b8 MM |
230 | |
231 | if (skb) { | |
232 | pr_debug("synack seq=%u", TCP_SKB_CB(skb)->seq); | |
233 | subflow->ssn_offset = TCP_SKB_CB(skb)->seq; | |
234 | } | |
ec3edaa7 PK |
235 | } else if (subflow->mp_join) { |
236 | pr_debug("subflow=%p, thmac=%llu, remote_nonce=%u", | |
237 | subflow, subflow->thmac, | |
238 | subflow->remote_nonce); | |
239 | if (!subflow_thmac_valid(subflow)) { | |
240 | subflow->mp_join = 0; | |
241 | goto do_reset; | |
242 | } | |
243 | ||
244 | subflow_generate_hmac(subflow->local_key, subflow->remote_key, | |
245 | subflow->local_nonce, | |
246 | subflow->remote_nonce, | |
247 | subflow->hmac); | |
248 | ||
249 | if (skb) | |
250 | subflow->ssn_offset = TCP_SKB_CB(skb)->seq; | |
251 | ||
252 | if (!mptcp_finish_join(sk)) | |
253 | goto do_reset; | |
254 | ||
255 | subflow->conn_finished = 1; | |
256 | } else { | |
257 | do_reset: | |
258 | tcp_send_active_reset(sk, GFP_ATOMIC); | |
259 | tcp_done(sk); | |
cec37a6e PK |
260 | } |
261 | } | |
262 | ||
263 | static struct request_sock_ops subflow_request_sock_ops; | |
264 | static struct tcp_request_sock_ops subflow_request_sock_ipv4_ops; | |
265 | ||
266 | static int subflow_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
267 | { | |
268 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
269 | ||
270 | pr_debug("subflow=%p", subflow); | |
271 | ||
272 | /* Never answer to SYNs sent to broadcast or multicast */ | |
273 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) | |
274 | goto drop; | |
275 | ||
276 | return tcp_conn_request(&subflow_request_sock_ops, | |
277 | &subflow_request_sock_ipv4_ops, | |
278 | sk, skb); | |
279 | drop: | |
280 | tcp_listendrop(sk); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
285 | static struct tcp_request_sock_ops subflow_request_sock_ipv6_ops; | |
286 | static struct inet_connection_sock_af_ops subflow_v6_specific; | |
287 | static struct inet_connection_sock_af_ops subflow_v6m_specific; | |
288 | ||
289 | static int subflow_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
290 | { | |
291 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
292 | ||
293 | pr_debug("subflow=%p", subflow); | |
294 | ||
295 | if (skb->protocol == htons(ETH_P_IP)) | |
296 | return subflow_v4_conn_request(sk, skb); | |
297 | ||
298 | if (!ipv6_unicast_destination(skb)) | |
299 | goto drop; | |
300 | ||
301 | return tcp_conn_request(&subflow_request_sock_ops, | |
302 | &subflow_request_sock_ipv6_ops, sk, skb); | |
303 | ||
304 | drop: | |
305 | tcp_listendrop(sk); | |
306 | return 0; /* don't send reset */ | |
307 | } | |
308 | #endif | |
309 | ||
f296234c PK |
310 | /* validate hmac received in third ACK */ |
311 | static bool subflow_hmac_valid(const struct request_sock *req, | |
312 | const struct tcp_options_received *rx_opt) | |
313 | { | |
314 | const struct mptcp_subflow_request_sock *subflow_req; | |
315 | u8 hmac[MPTCPOPT_HMAC_LEN]; | |
316 | struct mptcp_sock *msk; | |
317 | bool ret; | |
318 | ||
319 | subflow_req = mptcp_subflow_rsk(req); | |
320 | msk = mptcp_token_get_sock(subflow_req->token); | |
321 | if (!msk) | |
322 | return false; | |
323 | ||
324 | subflow_generate_hmac(msk->remote_key, msk->local_key, | |
325 | subflow_req->remote_nonce, | |
326 | subflow_req->local_nonce, hmac); | |
327 | ||
328 | ret = true; | |
329 | if (crypto_memneq(hmac, rx_opt->mptcp.hmac, sizeof(hmac))) | |
330 | ret = false; | |
331 | ||
332 | sock_put((struct sock *)msk); | |
333 | return ret; | |
334 | } | |
335 | ||
cec37a6e PK |
336 | static struct sock *subflow_syn_recv_sock(const struct sock *sk, |
337 | struct sk_buff *skb, | |
338 | struct request_sock *req, | |
339 | struct dst_entry *dst, | |
340 | struct request_sock *req_unhash, | |
341 | bool *own_req) | |
342 | { | |
343 | struct mptcp_subflow_context *listener = mptcp_subflow_ctx(sk); | |
cc7972ea CP |
344 | struct mptcp_subflow_request_sock *subflow_req; |
345 | struct tcp_options_received opt_rx; | |
f296234c | 346 | bool fallback_is_fatal = false; |
58b09919 | 347 | struct sock *new_msk = NULL; |
cec37a6e PK |
348 | struct sock *child; |
349 | ||
350 | pr_debug("listener=%p, req=%p, conn=%p", listener, req, listener->conn); | |
351 | ||
ae2dd716 FW |
352 | if (tcp_rsk(req)->is_mptcp == 0) |
353 | goto create_child; | |
354 | ||
d22f4988 | 355 | /* if the sk is MP_CAPABLE, we try to fetch the client key */ |
cc7972ea CP |
356 | subflow_req = mptcp_subflow_rsk(req); |
357 | if (subflow_req->mp_capable) { | |
d22f4988 CP |
358 | if (TCP_SKB_CB(skb)->seq != subflow_req->ssn_offset + 1) { |
359 | /* here we can receive and accept an in-window, | |
360 | * out-of-order pkt, which will not carry the MP_CAPABLE | |
361 | * opt even on mptcp enabled paths | |
362 | */ | |
58b09919 | 363 | goto create_msk; |
d22f4988 CP |
364 | } |
365 | ||
cc7972ea CP |
366 | opt_rx.mptcp.mp_capable = 0; |
367 | mptcp_get_options(skb, &opt_rx); | |
d22f4988 | 368 | if (opt_rx.mptcp.mp_capable) { |
cc7972ea | 369 | subflow_req->remote_key = opt_rx.mptcp.sndr_key; |
d22f4988 CP |
370 | subflow_req->remote_key_valid = 1; |
371 | } else { | |
372 | subflow_req->mp_capable = 0; | |
58b09919 | 373 | goto create_child; |
d22f4988 | 374 | } |
58b09919 PA |
375 | |
376 | create_msk: | |
377 | new_msk = mptcp_sk_clone(listener->conn, req); | |
378 | if (!new_msk) | |
379 | subflow_req->mp_capable = 0; | |
f296234c PK |
380 | } else if (subflow_req->mp_join) { |
381 | fallback_is_fatal = true; | |
382 | opt_rx.mptcp.mp_join = 0; | |
383 | mptcp_get_options(skb, &opt_rx); | |
384 | if (!opt_rx.mptcp.mp_join || | |
385 | !subflow_hmac_valid(req, &opt_rx)) | |
386 | return NULL; | |
cc7972ea | 387 | } |
cec37a6e | 388 | |
d22f4988 | 389 | create_child: |
cec37a6e PK |
390 | child = listener->icsk_af_ops->syn_recv_sock(sk, skb, req, dst, |
391 | req_unhash, own_req); | |
392 | ||
393 | if (child && *own_req) { | |
79c0949e PK |
394 | struct mptcp_subflow_context *ctx = mptcp_subflow_ctx(child); |
395 | ||
f296234c PK |
396 | /* we have null ctx on TCP fallback, which is fatal on |
397 | * MPJ handshake | |
79c0949e | 398 | */ |
f296234c PK |
399 | if (!ctx) { |
400 | if (fallback_is_fatal) | |
401 | goto close_child; | |
58b09919 | 402 | goto out; |
f296234c | 403 | } |
79c0949e PK |
404 | |
405 | if (ctx->mp_capable) { | |
58b09919 PA |
406 | /* new mpc subflow takes ownership of the newly |
407 | * created mptcp socket | |
408 | */ | |
1b1c7a0e PK |
409 | inet_sk_state_store(new_msk, TCP_ESTABLISHED); |
410 | mptcp_pm_new_connection(mptcp_sk(new_msk), 1); | |
58b09919 PA |
411 | ctx->conn = new_msk; |
412 | new_msk = NULL; | |
f296234c PK |
413 | } else if (ctx->mp_join) { |
414 | struct mptcp_sock *owner; | |
415 | ||
416 | owner = mptcp_token_get_sock(ctx->token); | |
417 | if (!owner) | |
418 | goto close_child; | |
419 | ||
420 | ctx->conn = (struct sock *)owner; | |
421 | if (!mptcp_finish_join(child)) | |
422 | goto close_child; | |
cec37a6e PK |
423 | } |
424 | } | |
425 | ||
58b09919 PA |
426 | out: |
427 | /* dispose of the left over mptcp master, if any */ | |
428 | if (unlikely(new_msk)) | |
429 | sock_put(new_msk); | |
cec37a6e | 430 | return child; |
f296234c PK |
431 | |
432 | close_child: | |
433 | tcp_send_active_reset(child, GFP_ATOMIC); | |
434 | inet_csk_prepare_forced_close(child); | |
435 | tcp_done(child); | |
436 | return NULL; | |
cec37a6e PK |
437 | } |
438 | ||
439 | static struct inet_connection_sock_af_ops subflow_specific; | |
440 | ||
648ef4b8 MM |
441 | enum mapping_status { |
442 | MAPPING_OK, | |
443 | MAPPING_INVALID, | |
444 | MAPPING_EMPTY, | |
445 | MAPPING_DATA_FIN | |
446 | }; | |
447 | ||
448 | static u64 expand_seq(u64 old_seq, u16 old_data_len, u64 seq) | |
449 | { | |
450 | if ((u32)seq == (u32)old_seq) | |
451 | return old_seq; | |
452 | ||
453 | /* Assume map covers data not mapped yet. */ | |
454 | return seq | ((old_seq + old_data_len + 1) & GENMASK_ULL(63, 32)); | |
455 | } | |
456 | ||
457 | static void warn_bad_map(struct mptcp_subflow_context *subflow, u32 ssn) | |
458 | { | |
459 | WARN_ONCE(1, "Bad mapping: ssn=%d map_seq=%d map_data_len=%d", | |
460 | ssn, subflow->map_subflow_seq, subflow->map_data_len); | |
461 | } | |
462 | ||
463 | static bool skb_is_fully_mapped(struct sock *ssk, struct sk_buff *skb) | |
464 | { | |
465 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); | |
466 | unsigned int skb_consumed; | |
467 | ||
468 | skb_consumed = tcp_sk(ssk)->copied_seq - TCP_SKB_CB(skb)->seq; | |
469 | if (WARN_ON_ONCE(skb_consumed >= skb->len)) | |
470 | return true; | |
471 | ||
472 | return skb->len - skb_consumed <= subflow->map_data_len - | |
473 | mptcp_subflow_get_map_offset(subflow); | |
474 | } | |
475 | ||
476 | static bool validate_mapping(struct sock *ssk, struct sk_buff *skb) | |
477 | { | |
478 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); | |
479 | u32 ssn = tcp_sk(ssk)->copied_seq - subflow->ssn_offset; | |
480 | ||
481 | if (unlikely(before(ssn, subflow->map_subflow_seq))) { | |
482 | /* Mapping covers data later in the subflow stream, | |
483 | * currently unsupported. | |
484 | */ | |
485 | warn_bad_map(subflow, ssn); | |
486 | return false; | |
487 | } | |
488 | if (unlikely(!before(ssn, subflow->map_subflow_seq + | |
489 | subflow->map_data_len))) { | |
490 | /* Mapping does covers past subflow data, invalid */ | |
491 | warn_bad_map(subflow, ssn + skb->len); | |
492 | return false; | |
493 | } | |
494 | return true; | |
495 | } | |
496 | ||
497 | static enum mapping_status get_mapping_status(struct sock *ssk) | |
498 | { | |
499 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); | |
500 | struct mptcp_ext *mpext; | |
501 | struct sk_buff *skb; | |
502 | u16 data_len; | |
503 | u64 map_seq; | |
504 | ||
505 | skb = skb_peek(&ssk->sk_receive_queue); | |
506 | if (!skb) | |
507 | return MAPPING_EMPTY; | |
508 | ||
509 | mpext = mptcp_get_ext(skb); | |
510 | if (!mpext || !mpext->use_map) { | |
511 | if (!subflow->map_valid && !skb->len) { | |
512 | /* the TCP stack deliver 0 len FIN pkt to the receive | |
513 | * queue, that is the only 0len pkts ever expected here, | |
514 | * and we can admit no mapping only for 0 len pkts | |
515 | */ | |
516 | if (!(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)) | |
517 | WARN_ONCE(1, "0len seq %d:%d flags %x", | |
518 | TCP_SKB_CB(skb)->seq, | |
519 | TCP_SKB_CB(skb)->end_seq, | |
520 | TCP_SKB_CB(skb)->tcp_flags); | |
521 | sk_eat_skb(ssk, skb); | |
522 | return MAPPING_EMPTY; | |
523 | } | |
524 | ||
525 | if (!subflow->map_valid) | |
526 | return MAPPING_INVALID; | |
527 | ||
528 | goto validate_seq; | |
529 | } | |
530 | ||
531 | pr_debug("seq=%llu is64=%d ssn=%u data_len=%u data_fin=%d", | |
532 | mpext->data_seq, mpext->dsn64, mpext->subflow_seq, | |
533 | mpext->data_len, mpext->data_fin); | |
534 | ||
535 | data_len = mpext->data_len; | |
536 | if (data_len == 0) { | |
537 | pr_err("Infinite mapping not handled"); | |
538 | return MAPPING_INVALID; | |
539 | } | |
540 | ||
541 | if (mpext->data_fin == 1) { | |
542 | if (data_len == 1) { | |
543 | pr_debug("DATA_FIN with no payload"); | |
544 | if (subflow->map_valid) { | |
545 | /* A DATA_FIN might arrive in a DSS | |
546 | * option before the previous mapping | |
547 | * has been fully consumed. Continue | |
548 | * handling the existing mapping. | |
549 | */ | |
550 | skb_ext_del(skb, SKB_EXT_MPTCP); | |
551 | return MAPPING_OK; | |
552 | } else { | |
553 | return MAPPING_DATA_FIN; | |
554 | } | |
555 | } | |
556 | ||
557 | /* Adjust for DATA_FIN using 1 byte of sequence space */ | |
558 | data_len--; | |
559 | } | |
560 | ||
561 | if (!mpext->dsn64) { | |
562 | map_seq = expand_seq(subflow->map_seq, subflow->map_data_len, | |
563 | mpext->data_seq); | |
564 | pr_debug("expanded seq=%llu", subflow->map_seq); | |
565 | } else { | |
566 | map_seq = mpext->data_seq; | |
567 | } | |
568 | ||
569 | if (subflow->map_valid) { | |
570 | /* Allow replacing only with an identical map */ | |
571 | if (subflow->map_seq == map_seq && | |
572 | subflow->map_subflow_seq == mpext->subflow_seq && | |
573 | subflow->map_data_len == data_len) { | |
574 | skb_ext_del(skb, SKB_EXT_MPTCP); | |
575 | return MAPPING_OK; | |
576 | } | |
577 | ||
578 | /* If this skb data are fully covered by the current mapping, | |
579 | * the new map would need caching, which is not supported | |
580 | */ | |
581 | if (skb_is_fully_mapped(ssk, skb)) | |
582 | return MAPPING_INVALID; | |
583 | ||
584 | /* will validate the next map after consuming the current one */ | |
585 | return MAPPING_OK; | |
586 | } | |
587 | ||
588 | subflow->map_seq = map_seq; | |
589 | subflow->map_subflow_seq = mpext->subflow_seq; | |
590 | subflow->map_data_len = data_len; | |
591 | subflow->map_valid = 1; | |
d22f4988 | 592 | subflow->mpc_map = mpext->mpc_map; |
648ef4b8 MM |
593 | pr_debug("new map seq=%llu subflow_seq=%u data_len=%u", |
594 | subflow->map_seq, subflow->map_subflow_seq, | |
595 | subflow->map_data_len); | |
596 | ||
597 | validate_seq: | |
598 | /* we revalidate valid mapping on new skb, because we must ensure | |
599 | * the current skb is completely covered by the available mapping | |
600 | */ | |
601 | if (!validate_mapping(ssk, skb)) | |
602 | return MAPPING_INVALID; | |
603 | ||
604 | skb_ext_del(skb, SKB_EXT_MPTCP); | |
605 | return MAPPING_OK; | |
606 | } | |
607 | ||
bfae9dae FW |
608 | static int subflow_read_actor(read_descriptor_t *desc, |
609 | struct sk_buff *skb, | |
610 | unsigned int offset, size_t len) | |
611 | { | |
612 | size_t copy_len = min(desc->count, len); | |
613 | ||
614 | desc->count -= copy_len; | |
615 | ||
616 | pr_debug("flushed %zu bytes, %zu left", copy_len, desc->count); | |
617 | return copy_len; | |
618 | } | |
619 | ||
648ef4b8 MM |
620 | static bool subflow_check_data_avail(struct sock *ssk) |
621 | { | |
622 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); | |
623 | enum mapping_status status; | |
624 | struct mptcp_sock *msk; | |
625 | struct sk_buff *skb; | |
626 | ||
627 | pr_debug("msk=%p ssk=%p data_avail=%d skb=%p", subflow->conn, ssk, | |
628 | subflow->data_avail, skb_peek(&ssk->sk_receive_queue)); | |
629 | if (subflow->data_avail) | |
630 | return true; | |
631 | ||
648ef4b8 MM |
632 | msk = mptcp_sk(subflow->conn); |
633 | for (;;) { | |
634 | u32 map_remaining; | |
635 | size_t delta; | |
636 | u64 ack_seq; | |
637 | u64 old_ack; | |
638 | ||
639 | status = get_mapping_status(ssk); | |
640 | pr_debug("msk=%p ssk=%p status=%d", msk, ssk, status); | |
641 | if (status == MAPPING_INVALID) { | |
642 | ssk->sk_err = EBADMSG; | |
643 | goto fatal; | |
644 | } | |
645 | ||
646 | if (status != MAPPING_OK) | |
647 | return false; | |
648 | ||
649 | skb = skb_peek(&ssk->sk_receive_queue); | |
650 | if (WARN_ON_ONCE(!skb)) | |
651 | return false; | |
652 | ||
d22f4988 CP |
653 | /* if msk lacks the remote key, this subflow must provide an |
654 | * MP_CAPABLE-based mapping | |
655 | */ | |
656 | if (unlikely(!READ_ONCE(msk->can_ack))) { | |
657 | if (!subflow->mpc_map) { | |
658 | ssk->sk_err = EBADMSG; | |
659 | goto fatal; | |
660 | } | |
661 | WRITE_ONCE(msk->remote_key, subflow->remote_key); | |
662 | WRITE_ONCE(msk->ack_seq, subflow->map_seq); | |
663 | WRITE_ONCE(msk->can_ack, true); | |
664 | } | |
665 | ||
648ef4b8 MM |
666 | old_ack = READ_ONCE(msk->ack_seq); |
667 | ack_seq = mptcp_subflow_get_mapped_dsn(subflow); | |
668 | pr_debug("msk ack_seq=%llx subflow ack_seq=%llx", old_ack, | |
669 | ack_seq); | |
670 | if (ack_seq == old_ack) | |
671 | break; | |
672 | ||
673 | /* only accept in-sequence mapping. Old values are spurious | |
674 | * retransmission; we can hit "future" values on active backup | |
675 | * subflow switch, we relay on retransmissions to get | |
676 | * in-sequence data. | |
677 | * Cuncurrent subflows support will require subflow data | |
678 | * reordering | |
679 | */ | |
680 | map_remaining = subflow->map_data_len - | |
681 | mptcp_subflow_get_map_offset(subflow); | |
682 | if (before64(ack_seq, old_ack)) | |
683 | delta = min_t(size_t, old_ack - ack_seq, map_remaining); | |
684 | else | |
685 | delta = min_t(size_t, ack_seq - old_ack, map_remaining); | |
686 | ||
687 | /* discard mapped data */ | |
688 | pr_debug("discarding %zu bytes, current map len=%d", delta, | |
689 | map_remaining); | |
690 | if (delta) { | |
648ef4b8 MM |
691 | read_descriptor_t desc = { |
692 | .count = delta, | |
648ef4b8 MM |
693 | }; |
694 | int ret; | |
695 | ||
bfae9dae | 696 | ret = tcp_read_sock(ssk, &desc, subflow_read_actor); |
648ef4b8 MM |
697 | if (ret < 0) { |
698 | ssk->sk_err = -ret; | |
699 | goto fatal; | |
700 | } | |
701 | if (ret < delta) | |
702 | return false; | |
703 | if (delta == map_remaining) | |
704 | subflow->map_valid = 0; | |
705 | } | |
706 | } | |
707 | return true; | |
708 | ||
709 | fatal: | |
710 | /* fatal protocol error, close the socket */ | |
711 | /* This barrier is coupled with smp_rmb() in tcp_poll() */ | |
712 | smp_wmb(); | |
713 | ssk->sk_error_report(ssk); | |
714 | tcp_set_state(ssk, TCP_CLOSE); | |
715 | tcp_send_active_reset(ssk, GFP_ATOMIC); | |
716 | return false; | |
717 | } | |
718 | ||
719 | bool mptcp_subflow_data_available(struct sock *sk) | |
720 | { | |
721 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
722 | struct sk_buff *skb; | |
723 | ||
724 | /* check if current mapping is still valid */ | |
725 | if (subflow->map_valid && | |
726 | mptcp_subflow_get_map_offset(subflow) >= subflow->map_data_len) { | |
727 | subflow->map_valid = 0; | |
728 | subflow->data_avail = 0; | |
729 | ||
730 | pr_debug("Done with mapping: seq=%u data_len=%u", | |
731 | subflow->map_subflow_seq, | |
732 | subflow->map_data_len); | |
733 | } | |
734 | ||
735 | if (!subflow_check_data_avail(sk)) { | |
736 | subflow->data_avail = 0; | |
737 | return false; | |
738 | } | |
739 | ||
740 | skb = skb_peek(&sk->sk_receive_queue); | |
741 | subflow->data_avail = skb && | |
742 | before(tcp_sk(sk)->copied_seq, TCP_SKB_CB(skb)->end_seq); | |
743 | return subflow->data_avail; | |
744 | } | |
745 | ||
746 | static void subflow_data_ready(struct sock *sk) | |
747 | { | |
748 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
749 | struct sock *parent = subflow->conn; | |
750 | ||
f296234c | 751 | if (!subflow->mp_capable && !subflow->mp_join) { |
648ef4b8 MM |
752 | subflow->tcp_data_ready(sk); |
753 | ||
dc093db5 | 754 | parent->sk_data_ready(parent); |
648ef4b8 MM |
755 | return; |
756 | } | |
757 | ||
101f6f85 | 758 | if (mptcp_subflow_data_available(sk)) |
2e52213c | 759 | mptcp_data_ready(parent, sk); |
648ef4b8 MM |
760 | } |
761 | ||
762 | static void subflow_write_space(struct sock *sk) | |
763 | { | |
764 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
765 | struct sock *parent = subflow->conn; | |
766 | ||
767 | sk_stream_write_space(sk); | |
dc093db5 | 768 | if (sk_stream_is_writeable(sk)) { |
1891c4a0 FW |
769 | set_bit(MPTCP_SEND_SPACE, &mptcp_sk(parent)->flags); |
770 | smp_mb__after_atomic(); | |
771 | /* set SEND_SPACE before sk_stream_write_space clears NOSPACE */ | |
648ef4b8 MM |
772 | sk_stream_write_space(parent); |
773 | } | |
774 | } | |
775 | ||
cec37a6e PK |
776 | static struct inet_connection_sock_af_ops * |
777 | subflow_default_af_ops(struct sock *sk) | |
778 | { | |
779 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
780 | if (sk->sk_family == AF_INET6) | |
781 | return &subflow_v6_specific; | |
782 | #endif | |
783 | return &subflow_specific; | |
784 | } | |
785 | ||
cec37a6e | 786 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
31484d56 GU |
787 | void mptcpv6_handle_mapped(struct sock *sk, bool mapped) |
788 | { | |
cec37a6e PK |
789 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); |
790 | struct inet_connection_sock *icsk = inet_csk(sk); | |
791 | struct inet_connection_sock_af_ops *target; | |
792 | ||
793 | target = mapped ? &subflow_v6m_specific : subflow_default_af_ops(sk); | |
794 | ||
795 | pr_debug("subflow=%p family=%d ops=%p target=%p mapped=%d", | |
edc7e489 | 796 | subflow, sk->sk_family, icsk->icsk_af_ops, target, mapped); |
cec37a6e PK |
797 | |
798 | if (likely(icsk->icsk_af_ops == target)) | |
799 | return; | |
800 | ||
801 | subflow->icsk_af_ops = icsk->icsk_af_ops; | |
802 | icsk->icsk_af_ops = target; | |
cec37a6e | 803 | } |
31484d56 | 804 | #endif |
cec37a6e | 805 | |
ec3edaa7 PK |
806 | static void mptcp_info2sockaddr(const struct mptcp_addr_info *info, |
807 | struct sockaddr_storage *addr) | |
808 | { | |
809 | memset(addr, 0, sizeof(*addr)); | |
810 | addr->ss_family = info->family; | |
811 | if (addr->ss_family == AF_INET) { | |
812 | struct sockaddr_in *in_addr = (struct sockaddr_in *)addr; | |
813 | ||
814 | in_addr->sin_addr = info->addr; | |
815 | in_addr->sin_port = info->port; | |
816 | } | |
817 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
818 | else if (addr->ss_family == AF_INET6) { | |
819 | struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)addr; | |
820 | ||
821 | in6_addr->sin6_addr = info->addr6; | |
822 | in6_addr->sin6_port = info->port; | |
823 | } | |
824 | #endif | |
825 | } | |
826 | ||
827 | int __mptcp_subflow_connect(struct sock *sk, int ifindex, | |
828 | const struct mptcp_addr_info *loc, | |
829 | const struct mptcp_addr_info *remote) | |
830 | { | |
831 | struct mptcp_sock *msk = mptcp_sk(sk); | |
832 | struct mptcp_subflow_context *subflow; | |
833 | struct sockaddr_storage addr; | |
834 | struct socket *sf; | |
835 | u32 remote_token; | |
836 | int addrlen; | |
837 | int err; | |
838 | ||
839 | if (sk->sk_state != TCP_ESTABLISHED) | |
840 | return -ENOTCONN; | |
841 | ||
842 | err = mptcp_subflow_create_socket(sk, &sf); | |
843 | if (err) | |
844 | return err; | |
845 | ||
846 | subflow = mptcp_subflow_ctx(sf->sk); | |
847 | subflow->remote_key = msk->remote_key; | |
848 | subflow->local_key = msk->local_key; | |
849 | subflow->token = msk->token; | |
850 | mptcp_info2sockaddr(loc, &addr); | |
851 | ||
852 | addrlen = sizeof(struct sockaddr_in); | |
853 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
854 | if (loc->family == AF_INET6) | |
855 | addrlen = sizeof(struct sockaddr_in6); | |
856 | #endif | |
857 | sf->sk->sk_bound_dev_if = ifindex; | |
858 | err = kernel_bind(sf, (struct sockaddr *)&addr, addrlen); | |
859 | if (err) | |
860 | goto failed; | |
861 | ||
862 | mptcp_crypto_key_sha(subflow->remote_key, &remote_token, NULL); | |
863 | pr_debug("msk=%p remote_token=%u", msk, remote_token); | |
864 | subflow->remote_token = remote_token; | |
865 | subflow->local_id = loc->id; | |
866 | subflow->request_join = 1; | |
867 | subflow->request_bkup = 1; | |
868 | mptcp_info2sockaddr(remote, &addr); | |
869 | ||
870 | err = kernel_connect(sf, (struct sockaddr *)&addr, addrlen, O_NONBLOCK); | |
871 | if (err && err != -EINPROGRESS) | |
872 | goto failed; | |
873 | ||
874 | spin_lock_bh(&msk->join_list_lock); | |
875 | list_add_tail(&subflow->node, &msk->join_list); | |
876 | spin_unlock_bh(&msk->join_list_lock); | |
877 | ||
878 | return err; | |
879 | ||
880 | failed: | |
881 | sock_release(sf); | |
882 | return err; | |
883 | } | |
884 | ||
2303f994 PK |
885 | int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock) |
886 | { | |
887 | struct mptcp_subflow_context *subflow; | |
888 | struct net *net = sock_net(sk); | |
889 | struct socket *sf; | |
890 | int err; | |
891 | ||
cec37a6e PK |
892 | err = sock_create_kern(net, sk->sk_family, SOCK_STREAM, IPPROTO_TCP, |
893 | &sf); | |
2303f994 PK |
894 | if (err) |
895 | return err; | |
896 | ||
897 | lock_sock(sf->sk); | |
898 | ||
899 | /* kernel sockets do not by default acquire net ref, but TCP timer | |
900 | * needs it. | |
901 | */ | |
902 | sf->sk->sk_net_refcnt = 1; | |
903 | get_net(net); | |
f6f7d8cf | 904 | #ifdef CONFIG_PROC_FS |
2303f994 | 905 | this_cpu_add(*net->core.sock_inuse, 1); |
f6f7d8cf | 906 | #endif |
2303f994 PK |
907 | err = tcp_set_ulp(sf->sk, "mptcp"); |
908 | release_sock(sf->sk); | |
909 | ||
910 | if (err) | |
911 | return err; | |
912 | ||
913 | subflow = mptcp_subflow_ctx(sf->sk); | |
914 | pr_debug("subflow=%p", subflow); | |
915 | ||
916 | *new_sock = sf; | |
79c0949e | 917 | sock_hold(sk); |
2303f994 PK |
918 | subflow->conn = sk; |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
923 | static struct mptcp_subflow_context *subflow_create_ctx(struct sock *sk, | |
924 | gfp_t priority) | |
925 | { | |
926 | struct inet_connection_sock *icsk = inet_csk(sk); | |
927 | struct mptcp_subflow_context *ctx; | |
928 | ||
929 | ctx = kzalloc(sizeof(*ctx), priority); | |
930 | if (!ctx) | |
931 | return NULL; | |
932 | ||
933 | rcu_assign_pointer(icsk->icsk_ulp_data, ctx); | |
cec37a6e | 934 | INIT_LIST_HEAD(&ctx->node); |
2303f994 PK |
935 | |
936 | pr_debug("subflow=%p", ctx); | |
937 | ||
938 | ctx->tcp_sock = sk; | |
939 | ||
940 | return ctx; | |
941 | } | |
942 | ||
648ef4b8 MM |
943 | static void __subflow_state_change(struct sock *sk) |
944 | { | |
945 | struct socket_wq *wq; | |
946 | ||
947 | rcu_read_lock(); | |
948 | wq = rcu_dereference(sk->sk_wq); | |
949 | if (skwq_has_sleeper(wq)) | |
950 | wake_up_interruptible_all(&wq->wait); | |
951 | rcu_read_unlock(); | |
952 | } | |
953 | ||
954 | static bool subflow_is_done(const struct sock *sk) | |
955 | { | |
956 | return sk->sk_shutdown & RCV_SHUTDOWN || sk->sk_state == TCP_CLOSE; | |
957 | } | |
958 | ||
959 | static void subflow_state_change(struct sock *sk) | |
960 | { | |
961 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
dc093db5 | 962 | struct sock *parent = subflow->conn; |
648ef4b8 MM |
963 | |
964 | __subflow_state_change(sk); | |
965 | ||
966 | /* as recvmsg() does not acquire the subflow socket for ssk selection | |
967 | * a fin packet carrying a DSS can be unnoticed if we don't trigger | |
968 | * the data available machinery here. | |
969 | */ | |
dc093db5 | 970 | if (subflow->mp_capable && mptcp_subflow_data_available(sk)) |
2e52213c | 971 | mptcp_data_ready(parent, sk); |
648ef4b8 | 972 | |
dc093db5 | 973 | if (!(parent->sk_shutdown & RCV_SHUTDOWN) && |
648ef4b8 MM |
974 | !subflow->rx_eof && subflow_is_done(sk)) { |
975 | subflow->rx_eof = 1; | |
976 | parent->sk_shutdown |= RCV_SHUTDOWN; | |
977 | __subflow_state_change(parent); | |
978 | } | |
979 | } | |
980 | ||
2303f994 PK |
981 | static int subflow_ulp_init(struct sock *sk) |
982 | { | |
cec37a6e | 983 | struct inet_connection_sock *icsk = inet_csk(sk); |
2303f994 PK |
984 | struct mptcp_subflow_context *ctx; |
985 | struct tcp_sock *tp = tcp_sk(sk); | |
986 | int err = 0; | |
987 | ||
988 | /* disallow attaching ULP to a socket unless it has been | |
989 | * created with sock_create_kern() | |
990 | */ | |
991 | if (!sk->sk_kern_sock) { | |
992 | err = -EOPNOTSUPP; | |
993 | goto out; | |
994 | } | |
995 | ||
996 | ctx = subflow_create_ctx(sk, GFP_KERNEL); | |
997 | if (!ctx) { | |
998 | err = -ENOMEM; | |
999 | goto out; | |
1000 | } | |
1001 | ||
1002 | pr_debug("subflow=%p, family=%d", ctx, sk->sk_family); | |
1003 | ||
1004 | tp->is_mptcp = 1; | |
cec37a6e PK |
1005 | ctx->icsk_af_ops = icsk->icsk_af_ops; |
1006 | icsk->icsk_af_ops = subflow_default_af_ops(sk); | |
648ef4b8 MM |
1007 | ctx->tcp_data_ready = sk->sk_data_ready; |
1008 | ctx->tcp_state_change = sk->sk_state_change; | |
1009 | ctx->tcp_write_space = sk->sk_write_space; | |
1010 | sk->sk_data_ready = subflow_data_ready; | |
1011 | sk->sk_write_space = subflow_write_space; | |
1012 | sk->sk_state_change = subflow_state_change; | |
2303f994 PK |
1013 | out: |
1014 | return err; | |
1015 | } | |
1016 | ||
1017 | static void subflow_ulp_release(struct sock *sk) | |
1018 | { | |
1019 | struct mptcp_subflow_context *ctx = mptcp_subflow_ctx(sk); | |
1020 | ||
1021 | if (!ctx) | |
1022 | return; | |
1023 | ||
79c0949e PK |
1024 | if (ctx->conn) |
1025 | sock_put(ctx->conn); | |
1026 | ||
2303f994 PK |
1027 | kfree_rcu(ctx, rcu); |
1028 | } | |
1029 | ||
648ef4b8 MM |
1030 | static void subflow_ulp_fallback(struct sock *sk, |
1031 | struct mptcp_subflow_context *old_ctx) | |
cec37a6e PK |
1032 | { |
1033 | struct inet_connection_sock *icsk = inet_csk(sk); | |
1034 | ||
648ef4b8 | 1035 | mptcp_subflow_tcp_fallback(sk, old_ctx); |
cec37a6e PK |
1036 | icsk->icsk_ulp_ops = NULL; |
1037 | rcu_assign_pointer(icsk->icsk_ulp_data, NULL); | |
1038 | tcp_sk(sk)->is_mptcp = 0; | |
1039 | } | |
1040 | ||
1041 | static void subflow_ulp_clone(const struct request_sock *req, | |
1042 | struct sock *newsk, | |
1043 | const gfp_t priority) | |
1044 | { | |
1045 | struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req); | |
1046 | struct mptcp_subflow_context *old_ctx = mptcp_subflow_ctx(newsk); | |
1047 | struct mptcp_subflow_context *new_ctx; | |
1048 | ||
f296234c PK |
1049 | if (!tcp_rsk(req)->is_mptcp || |
1050 | (!subflow_req->mp_capable && !subflow_req->mp_join)) { | |
648ef4b8 | 1051 | subflow_ulp_fallback(newsk, old_ctx); |
cec37a6e PK |
1052 | return; |
1053 | } | |
1054 | ||
1055 | new_ctx = subflow_create_ctx(newsk, priority); | |
edc7e489 | 1056 | if (!new_ctx) { |
648ef4b8 | 1057 | subflow_ulp_fallback(newsk, old_ctx); |
cec37a6e PK |
1058 | return; |
1059 | } | |
1060 | ||
1061 | new_ctx->conn_finished = 1; | |
1062 | new_ctx->icsk_af_ops = old_ctx->icsk_af_ops; | |
648ef4b8 MM |
1063 | new_ctx->tcp_data_ready = old_ctx->tcp_data_ready; |
1064 | new_ctx->tcp_state_change = old_ctx->tcp_state_change; | |
1065 | new_ctx->tcp_write_space = old_ctx->tcp_write_space; | |
58b09919 PA |
1066 | new_ctx->rel_write_seq = 1; |
1067 | new_ctx->tcp_sock = newsk; | |
1068 | ||
f296234c PK |
1069 | if (subflow_req->mp_capable) { |
1070 | /* see comments in subflow_syn_recv_sock(), MPTCP connection | |
1071 | * is fully established only after we receive the remote key | |
1072 | */ | |
1073 | new_ctx->mp_capable = 1; | |
1074 | new_ctx->fully_established = subflow_req->remote_key_valid; | |
1075 | new_ctx->can_ack = subflow_req->remote_key_valid; | |
1076 | new_ctx->remote_key = subflow_req->remote_key; | |
1077 | new_ctx->local_key = subflow_req->local_key; | |
1078 | new_ctx->token = subflow_req->token; | |
1079 | new_ctx->ssn_offset = subflow_req->ssn_offset; | |
1080 | new_ctx->idsn = subflow_req->idsn; | |
1081 | } else if (subflow_req->mp_join) { | |
ec3edaa7 | 1082 | new_ctx->ssn_offset = subflow_req->ssn_offset; |
f296234c PK |
1083 | new_ctx->mp_join = 1; |
1084 | new_ctx->fully_established = 1; | |
1085 | new_ctx->backup = subflow_req->backup; | |
1086 | new_ctx->local_id = subflow_req->local_id; | |
1087 | new_ctx->token = subflow_req->token; | |
1088 | new_ctx->thmac = subflow_req->thmac; | |
1089 | } | |
cec37a6e PK |
1090 | } |
1091 | ||
2303f994 PK |
1092 | static struct tcp_ulp_ops subflow_ulp_ops __read_mostly = { |
1093 | .name = "mptcp", | |
1094 | .owner = THIS_MODULE, | |
1095 | .init = subflow_ulp_init, | |
1096 | .release = subflow_ulp_release, | |
cec37a6e | 1097 | .clone = subflow_ulp_clone, |
2303f994 PK |
1098 | }; |
1099 | ||
cec37a6e PK |
1100 | static int subflow_ops_init(struct request_sock_ops *subflow_ops) |
1101 | { | |
1102 | subflow_ops->obj_size = sizeof(struct mptcp_subflow_request_sock); | |
1103 | subflow_ops->slab_name = "request_sock_subflow"; | |
1104 | ||
1105 | subflow_ops->slab = kmem_cache_create(subflow_ops->slab_name, | |
1106 | subflow_ops->obj_size, 0, | |
1107 | SLAB_ACCOUNT | | |
1108 | SLAB_TYPESAFE_BY_RCU, | |
1109 | NULL); | |
1110 | if (!subflow_ops->slab) | |
1111 | return -ENOMEM; | |
1112 | ||
79c0949e PK |
1113 | subflow_ops->destructor = subflow_req_destructor; |
1114 | ||
cec37a6e PK |
1115 | return 0; |
1116 | } | |
1117 | ||
2303f994 PK |
1118 | void mptcp_subflow_init(void) |
1119 | { | |
cec37a6e PK |
1120 | subflow_request_sock_ops = tcp_request_sock_ops; |
1121 | if (subflow_ops_init(&subflow_request_sock_ops) != 0) | |
1122 | panic("MPTCP: failed to init subflow request sock ops\n"); | |
1123 | ||
1124 | subflow_request_sock_ipv4_ops = tcp_request_sock_ipv4_ops; | |
1125 | subflow_request_sock_ipv4_ops.init_req = subflow_v4_init_req; | |
1126 | ||
1127 | subflow_specific = ipv4_specific; | |
1128 | subflow_specific.conn_request = subflow_v4_conn_request; | |
1129 | subflow_specific.syn_recv_sock = subflow_syn_recv_sock; | |
1130 | subflow_specific.sk_rx_dst_set = subflow_finish_connect; | |
79c0949e | 1131 | subflow_specific.rebuild_header = subflow_rebuild_header; |
cec37a6e PK |
1132 | |
1133 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
1134 | subflow_request_sock_ipv6_ops = tcp_request_sock_ipv6_ops; | |
1135 | subflow_request_sock_ipv6_ops.init_req = subflow_v6_init_req; | |
1136 | ||
1137 | subflow_v6_specific = ipv6_specific; | |
1138 | subflow_v6_specific.conn_request = subflow_v6_conn_request; | |
1139 | subflow_v6_specific.syn_recv_sock = subflow_syn_recv_sock; | |
1140 | subflow_v6_specific.sk_rx_dst_set = subflow_finish_connect; | |
79c0949e | 1141 | subflow_v6_specific.rebuild_header = subflow_rebuild_header; |
cec37a6e PK |
1142 | |
1143 | subflow_v6m_specific = subflow_v6_specific; | |
1144 | subflow_v6m_specific.queue_xmit = ipv4_specific.queue_xmit; | |
1145 | subflow_v6m_specific.send_check = ipv4_specific.send_check; | |
1146 | subflow_v6m_specific.net_header_len = ipv4_specific.net_header_len; | |
1147 | subflow_v6m_specific.mtu_reduced = ipv4_specific.mtu_reduced; | |
1148 | subflow_v6m_specific.net_frag_header_len = 0; | |
1149 | #endif | |
1150 | ||
5147dfb5 DC |
1151 | mptcp_diag_subflow_init(&subflow_ulp_ops); |
1152 | ||
2303f994 PK |
1153 | if (tcp_register_ulp(&subflow_ulp_ops) != 0) |
1154 | panic("MPTCP: failed to register subflows to ULP\n"); | |
1155 | } |