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Commit | Line | Data |
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01cacb00 PA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Multipath TCP | |
3 | * | |
4 | * Copyright (c) 2020, Red Hat, Inc. | |
5 | */ | |
6 | ||
c85adced GT |
7 | #define pr_fmt(fmt) "MPTCP: " fmt |
8 | ||
01cacb00 PA |
9 | #include <linux/inet.h> |
10 | #include <linux/kernel.h> | |
11 | #include <net/tcp.h> | |
12 | #include <net/netns/generic.h> | |
13 | #include <net/mptcp.h> | |
14 | #include <net/genetlink.h> | |
15 | #include <uapi/linux/mptcp.h> | |
16 | ||
17 | #include "protocol.h" | |
7a7e52e3 | 18 | #include "mib.h" |
01cacb00 PA |
19 | |
20 | /* forward declaration */ | |
21 | static struct genl_family mptcp_genl_family; | |
22 | ||
23 | static int pm_nl_pernet_id; | |
24 | ||
25 | struct mptcp_pm_addr_entry { | |
26 | struct list_head list; | |
01cacb00 PA |
27 | struct mptcp_addr_info addr; |
28 | struct rcu_head rcu; | |
29 | }; | |
30 | ||
0abd40f8 GT |
31 | struct mptcp_pm_add_entry { |
32 | struct list_head list; | |
33 | struct mptcp_addr_info addr; | |
00cfd77b GT |
34 | struct timer_list add_timer; |
35 | struct mptcp_sock *sock; | |
36 | u8 retrans_times; | |
0abd40f8 GT |
37 | }; |
38 | ||
efd5a4c0 GT |
39 | #define MAX_ADDR_ID 255 |
40 | #define BITMAP_SZ DIV_ROUND_UP(MAX_ADDR_ID + 1, BITS_PER_LONG) | |
41 | ||
01cacb00 PA |
42 | struct pm_nl_pernet { |
43 | /* protects pernet updates */ | |
44 | spinlock_t lock; | |
45 | struct list_head local_addr_list; | |
46 | unsigned int addrs; | |
47 | unsigned int add_addr_signal_max; | |
48 | unsigned int add_addr_accept_max; | |
49 | unsigned int local_addr_max; | |
50 | unsigned int subflows_max; | |
51 | unsigned int next_id; | |
efd5a4c0 | 52 | unsigned long id_bitmap[BITMAP_SZ]; |
01cacb00 PA |
53 | }; |
54 | ||
55 | #define MPTCP_PM_ADDR_MAX 8 | |
00cfd77b | 56 | #define ADD_ADDR_RETRANS_MAX 3 |
01cacb00 PA |
57 | |
58 | static bool addresses_equal(const struct mptcp_addr_info *a, | |
59 | struct mptcp_addr_info *b, bool use_port) | |
60 | { | |
61 | bool addr_equals = false; | |
62 | ||
7b9b0f7e MB |
63 | if (a->family == b->family) { |
64 | if (a->family == AF_INET) | |
65 | addr_equals = a->addr.s_addr == b->addr.s_addr; | |
01cacb00 | 66 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
7b9b0f7e MB |
67 | else |
68 | addr_equals = !ipv6_addr_cmp(&a->addr6, &b->addr6); | |
69 | } else if (a->family == AF_INET) { | |
70 | if (ipv6_addr_v4mapped(&b->addr6)) | |
71 | addr_equals = a->addr.s_addr == b->addr6.s6_addr32[3]; | |
72 | } else if (b->family == AF_INET) { | |
73 | if (ipv6_addr_v4mapped(&a->addr6)) | |
74 | addr_equals = a->addr6.s6_addr32[3] == b->addr.s_addr; | |
01cacb00 | 75 | #endif |
7b9b0f7e | 76 | } |
01cacb00 PA |
77 | |
78 | if (!addr_equals) | |
79 | return false; | |
80 | if (!use_port) | |
81 | return true; | |
82 | ||
83 | return a->port == b->port; | |
84 | } | |
85 | ||
57025817 GT |
86 | static bool address_zero(const struct mptcp_addr_info *addr) |
87 | { | |
88 | struct mptcp_addr_info zero; | |
89 | ||
90 | memset(&zero, 0, sizeof(zero)); | |
91 | zero.family = addr->family; | |
92 | ||
93 | return addresses_equal(addr, &zero, false); | |
94 | } | |
95 | ||
01cacb00 PA |
96 | static void local_address(const struct sock_common *skc, |
97 | struct mptcp_addr_info *addr) | |
98 | { | |
99 | addr->port = 0; | |
100 | addr->family = skc->skc_family; | |
101 | if (addr->family == AF_INET) | |
102 | addr->addr.s_addr = skc->skc_rcv_saddr; | |
103 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
104 | else if (addr->family == AF_INET6) | |
105 | addr->addr6 = skc->skc_v6_rcv_saddr; | |
106 | #endif | |
107 | } | |
108 | ||
109 | static void remote_address(const struct sock_common *skc, | |
110 | struct mptcp_addr_info *addr) | |
111 | { | |
112 | addr->family = skc->skc_family; | |
113 | addr->port = skc->skc_dport; | |
114 | if (addr->family == AF_INET) | |
115 | addr->addr.s_addr = skc->skc_daddr; | |
116 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
117 | else if (addr->family == AF_INET6) | |
118 | addr->addr6 = skc->skc_v6_daddr; | |
119 | #endif | |
120 | } | |
121 | ||
122 | static bool lookup_subflow_by_saddr(const struct list_head *list, | |
123 | struct mptcp_addr_info *saddr) | |
124 | { | |
125 | struct mptcp_subflow_context *subflow; | |
126 | struct mptcp_addr_info cur; | |
127 | struct sock_common *skc; | |
128 | ||
129 | list_for_each_entry(subflow, list, node) { | |
130 | skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow); | |
131 | ||
132 | local_address(skc, &cur); | |
133 | if (addresses_equal(&cur, saddr, false)) | |
134 | return true; | |
135 | } | |
136 | ||
137 | return false; | |
138 | } | |
139 | ||
140 | static struct mptcp_pm_addr_entry * | |
141 | select_local_address(const struct pm_nl_pernet *pernet, | |
142 | struct mptcp_sock *msk) | |
143 | { | |
144 | struct mptcp_pm_addr_entry *entry, *ret = NULL; | |
7b9b0f7e | 145 | struct sock *sk = (struct sock *)msk; |
01cacb00 PA |
146 | |
147 | rcu_read_lock(); | |
1bc7327b | 148 | __mptcp_flush_join_list(msk); |
01cacb00 | 149 | list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { |
ef0da3b8 | 150 | if (!(entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)) |
01cacb00 PA |
151 | continue; |
152 | ||
7b9b0f7e MB |
153 | if (entry->addr.family != sk->sk_family) { |
154 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
155 | if ((entry->addr.family == AF_INET && | |
156 | !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) || | |
157 | (sk->sk_family == AF_INET && | |
158 | !ipv6_addr_v4mapped(&entry->addr.addr6))) | |
159 | #endif | |
160 | continue; | |
161 | } | |
162 | ||
01cacb00 PA |
163 | /* avoid any address already in use by subflows and |
164 | * pending join | |
165 | */ | |
7b9b0f7e | 166 | if (!lookup_subflow_by_saddr(&msk->conn_list, &entry->addr)) { |
01cacb00 PA |
167 | ret = entry; |
168 | break; | |
169 | } | |
170 | } | |
01cacb00 PA |
171 | rcu_read_unlock(); |
172 | return ret; | |
173 | } | |
174 | ||
175 | static struct mptcp_pm_addr_entry * | |
176 | select_signal_address(struct pm_nl_pernet *pernet, unsigned int pos) | |
177 | { | |
178 | struct mptcp_pm_addr_entry *entry, *ret = NULL; | |
179 | int i = 0; | |
180 | ||
181 | rcu_read_lock(); | |
182 | /* do not keep any additional per socket state, just signal | |
183 | * the address list in order. | |
184 | * Note: removal from the local address list during the msk life-cycle | |
185 | * can lead to additional addresses not being announced. | |
186 | */ | |
187 | list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { | |
ef0da3b8 | 188 | if (!(entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) |
01cacb00 PA |
189 | continue; |
190 | if (i++ == pos) { | |
191 | ret = entry; | |
192 | break; | |
193 | } | |
194 | } | |
195 | rcu_read_unlock(); | |
196 | return ret; | |
197 | } | |
198 | ||
a914e586 GT |
199 | unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk) |
200 | { | |
201 | struct pm_nl_pernet *pernet; | |
202 | ||
203 | pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); | |
204 | return READ_ONCE(pernet->add_addr_signal_max); | |
205 | } | |
206 | EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_signal_max); | |
207 | ||
208 | unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk) | |
209 | { | |
210 | struct pm_nl_pernet *pernet; | |
211 | ||
212 | pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); | |
213 | return READ_ONCE(pernet->add_addr_accept_max); | |
214 | } | |
215 | EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_accept_max); | |
216 | ||
217 | unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk) | |
218 | { | |
219 | struct pm_nl_pernet *pernet; | |
220 | ||
221 | pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); | |
222 | return READ_ONCE(pernet->subflows_max); | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(mptcp_pm_get_subflows_max); | |
225 | ||
226 | static unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk) | |
227 | { | |
228 | struct pm_nl_pernet *pernet; | |
229 | ||
230 | pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); | |
231 | return READ_ONCE(pernet->local_addr_max); | |
232 | } | |
233 | ||
01cacb00 PA |
234 | static void check_work_pending(struct mptcp_sock *msk) |
235 | { | |
a914e586 GT |
236 | if (msk->pm.add_addr_signaled == mptcp_pm_get_add_addr_signal_max(msk) && |
237 | (msk->pm.local_addr_used == mptcp_pm_get_local_addr_max(msk) || | |
238 | msk->pm.subflows == mptcp_pm_get_subflows_max(msk))) | |
01cacb00 PA |
239 | WRITE_ONCE(msk->pm.work_pending, false); |
240 | } | |
241 | ||
00cfd77b GT |
242 | static struct mptcp_pm_add_entry * |
243 | lookup_anno_list_by_saddr(struct mptcp_sock *msk, | |
244 | struct mptcp_addr_info *addr) | |
b6c08380 | 245 | { |
0abd40f8 | 246 | struct mptcp_pm_add_entry *entry; |
b6c08380 GT |
247 | |
248 | list_for_each_entry(entry, &msk->pm.anno_list, list) { | |
249 | if (addresses_equal(&entry->addr, addr, false)) | |
00cfd77b | 250 | return entry; |
b6c08380 GT |
251 | } |
252 | ||
00cfd77b GT |
253 | return NULL; |
254 | } | |
255 | ||
256 | static void mptcp_pm_add_timer(struct timer_list *timer) | |
257 | { | |
258 | struct mptcp_pm_add_entry *entry = from_timer(entry, timer, add_timer); | |
259 | struct mptcp_sock *msk = entry->sock; | |
260 | struct sock *sk = (struct sock *)msk; | |
261 | ||
262 | pr_debug("msk=%p", msk); | |
263 | ||
264 | if (!msk) | |
265 | return; | |
266 | ||
267 | if (inet_sk_state_load(sk) == TCP_CLOSE) | |
268 | return; | |
269 | ||
270 | if (!entry->addr.id) | |
271 | return; | |
272 | ||
273 | if (mptcp_pm_should_add_signal(msk)) { | |
274 | sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX / 8); | |
275 | goto out; | |
276 | } | |
277 | ||
278 | spin_lock_bh(&msk->pm.lock); | |
279 | ||
280 | if (!mptcp_pm_should_add_signal(msk)) { | |
281 | pr_debug("retransmit ADD_ADDR id=%d", entry->addr.id); | |
0f5c9e3f | 282 | mptcp_pm_announce_addr(msk, &entry->addr, false, entry->addr.port); |
84dfe367 | 283 | mptcp_pm_add_addr_send_ack(msk); |
00cfd77b GT |
284 | entry->retrans_times++; |
285 | } | |
286 | ||
287 | if (entry->retrans_times < ADD_ADDR_RETRANS_MAX) | |
93f323b9 | 288 | sk_reset_timer(sk, timer, |
724d06b4 | 289 | jiffies + mptcp_get_add_addr_timeout(sock_net(sk))); |
00cfd77b GT |
290 | |
291 | spin_unlock_bh(&msk->pm.lock); | |
292 | ||
293 | out: | |
294 | __sock_put(sk); | |
295 | } | |
296 | ||
297 | struct mptcp_pm_add_entry * | |
298 | mptcp_pm_del_add_timer(struct mptcp_sock *msk, | |
299 | struct mptcp_addr_info *addr) | |
300 | { | |
301 | struct mptcp_pm_add_entry *entry; | |
302 | struct sock *sk = (struct sock *)msk; | |
303 | ||
304 | spin_lock_bh(&msk->pm.lock); | |
305 | entry = lookup_anno_list_by_saddr(msk, addr); | |
306 | if (entry) | |
307 | entry->retrans_times = ADD_ADDR_RETRANS_MAX; | |
308 | spin_unlock_bh(&msk->pm.lock); | |
309 | ||
310 | if (entry) | |
311 | sk_stop_timer_sync(sk, &entry->add_timer); | |
312 | ||
313 | return entry; | |
b6c08380 GT |
314 | } |
315 | ||
316 | static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, | |
317 | struct mptcp_pm_addr_entry *entry) | |
318 | { | |
0abd40f8 | 319 | struct mptcp_pm_add_entry *add_entry = NULL; |
00cfd77b | 320 | struct sock *sk = (struct sock *)msk; |
93f323b9 | 321 | struct net *net = sock_net(sk); |
b6c08380 GT |
322 | |
323 | if (lookup_anno_list_by_saddr(msk, &entry->addr)) | |
324 | return false; | |
325 | ||
0abd40f8 GT |
326 | add_entry = kmalloc(sizeof(*add_entry), GFP_ATOMIC); |
327 | if (!add_entry) | |
b6c08380 GT |
328 | return false; |
329 | ||
0abd40f8 | 330 | list_add(&add_entry->list, &msk->pm.anno_list); |
b6c08380 | 331 | |
00cfd77b GT |
332 | add_entry->addr = entry->addr; |
333 | add_entry->sock = msk; | |
334 | add_entry->retrans_times = 0; | |
335 | ||
336 | timer_setup(&add_entry->add_timer, mptcp_pm_add_timer, 0); | |
93f323b9 GT |
337 | sk_reset_timer(sk, &add_entry->add_timer, |
338 | jiffies + mptcp_get_add_addr_timeout(net)); | |
00cfd77b | 339 | |
b6c08380 GT |
340 | return true; |
341 | } | |
342 | ||
343 | void mptcp_pm_free_anno_list(struct mptcp_sock *msk) | |
344 | { | |
0abd40f8 | 345 | struct mptcp_pm_add_entry *entry, *tmp; |
00cfd77b GT |
346 | struct sock *sk = (struct sock *)msk; |
347 | LIST_HEAD(free_list); | |
b6c08380 GT |
348 | |
349 | pr_debug("msk=%p", msk); | |
350 | ||
351 | spin_lock_bh(&msk->pm.lock); | |
00cfd77b GT |
352 | list_splice_init(&msk->pm.anno_list, &free_list); |
353 | spin_unlock_bh(&msk->pm.lock); | |
354 | ||
355 | list_for_each_entry_safe(entry, tmp, &free_list, list) { | |
356 | sk_stop_timer_sync(sk, &entry->add_timer); | |
b6c08380 GT |
357 | kfree(entry); |
358 | } | |
b6c08380 GT |
359 | } |
360 | ||
01cacb00 PA |
361 | static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk) |
362 | { | |
363 | struct sock *sk = (struct sock *)msk; | |
364 | struct mptcp_pm_addr_entry *local; | |
a914e586 GT |
365 | unsigned int add_addr_signal_max; |
366 | unsigned int local_addr_max; | |
01cacb00 | 367 | struct pm_nl_pernet *pernet; |
a914e586 | 368 | unsigned int subflows_max; |
01cacb00 | 369 | |
432d9e74 | 370 | pernet = net_generic(sock_net(sk), pm_nl_pernet_id); |
01cacb00 | 371 | |
a914e586 GT |
372 | add_addr_signal_max = mptcp_pm_get_add_addr_signal_max(msk); |
373 | local_addr_max = mptcp_pm_get_local_addr_max(msk); | |
374 | subflows_max = mptcp_pm_get_subflows_max(msk); | |
375 | ||
01cacb00 | 376 | pr_debug("local %d:%d signal %d:%d subflows %d:%d\n", |
a914e586 GT |
377 | msk->pm.local_addr_used, local_addr_max, |
378 | msk->pm.add_addr_signaled, add_addr_signal_max, | |
379 | msk->pm.subflows, subflows_max); | |
01cacb00 PA |
380 | |
381 | /* check first for announce */ | |
a914e586 | 382 | if (msk->pm.add_addr_signaled < add_addr_signal_max) { |
01cacb00 PA |
383 | local = select_signal_address(pernet, |
384 | msk->pm.add_addr_signaled); | |
385 | ||
386 | if (local) { | |
b6c08380 GT |
387 | if (mptcp_pm_alloc_anno_list(msk, local)) { |
388 | msk->pm.add_addr_signaled++; | |
0f5c9e3f | 389 | mptcp_pm_announce_addr(msk, &local->addr, false, local->addr.port); |
84dfe367 | 390 | mptcp_pm_nl_add_addr_send_ack(msk); |
b6c08380 | 391 | } |
01cacb00 PA |
392 | } else { |
393 | /* pick failed, avoid fourther attempts later */ | |
a914e586 | 394 | msk->pm.local_addr_used = add_addr_signal_max; |
01cacb00 PA |
395 | } |
396 | ||
397 | check_work_pending(msk); | |
398 | } | |
399 | ||
400 | /* check if should create a new subflow */ | |
a914e586 GT |
401 | if (msk->pm.local_addr_used < local_addr_max && |
402 | msk->pm.subflows < subflows_max) { | |
01cacb00 PA |
403 | local = select_local_address(pernet, msk); |
404 | if (local) { | |
1f2f1931 MB |
405 | struct mptcp_addr_info remote = { 0 }; |
406 | ||
01cacb00 PA |
407 | msk->pm.local_addr_used++; |
408 | msk->pm.subflows++; | |
409 | check_work_pending(msk); | |
1f2f1931 | 410 | remote_address((struct sock_common *)sk, &remote); |
01cacb00 | 411 | spin_unlock_bh(&msk->pm.lock); |
ef0da3b8 | 412 | __mptcp_subflow_connect(sk, &local->addr, &remote); |
01cacb00 PA |
413 | spin_lock_bh(&msk->pm.lock); |
414 | return; | |
415 | } | |
416 | ||
417 | /* lookup failed, avoid fourther attempts later */ | |
a914e586 | 418 | msk->pm.local_addr_used = local_addr_max; |
01cacb00 PA |
419 | check_work_pending(msk); |
420 | } | |
421 | } | |
422 | ||
423 | void mptcp_pm_nl_fully_established(struct mptcp_sock *msk) | |
424 | { | |
425 | mptcp_pm_create_subflow_or_signal_addr(msk); | |
426 | } | |
427 | ||
428 | void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk) | |
429 | { | |
430 | mptcp_pm_create_subflow_or_signal_addr(msk); | |
431 | } | |
432 | ||
433 | void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk) | |
434 | { | |
435 | struct sock *sk = (struct sock *)msk; | |
a914e586 | 436 | unsigned int add_addr_accept_max; |
01cacb00 PA |
437 | struct mptcp_addr_info remote; |
438 | struct mptcp_addr_info local; | |
a914e586 | 439 | unsigned int subflows_max; |
0f5c9e3f | 440 | bool use_port = false; |
01cacb00 | 441 | |
a914e586 GT |
442 | add_addr_accept_max = mptcp_pm_get_add_addr_accept_max(msk); |
443 | subflows_max = mptcp_pm_get_subflows_max(msk); | |
444 | ||
01cacb00 | 445 | pr_debug("accepted %d:%d remote family %d", |
a914e586 | 446 | msk->pm.add_addr_accepted, add_addr_accept_max, |
01cacb00 PA |
447 | msk->pm.remote.family); |
448 | msk->pm.add_addr_accepted++; | |
449 | msk->pm.subflows++; | |
a914e586 GT |
450 | if (msk->pm.add_addr_accepted >= add_addr_accept_max || |
451 | msk->pm.subflows >= subflows_max) | |
01cacb00 PA |
452 | WRITE_ONCE(msk->pm.accept_addr, false); |
453 | ||
454 | /* connect to the specified remote address, using whatever | |
455 | * local address the routing configuration will pick. | |
456 | */ | |
457 | remote = msk->pm.remote; | |
458 | if (!remote.port) | |
459 | remote.port = sk->sk_dport; | |
0f5c9e3f GT |
460 | else |
461 | use_port = true; | |
01cacb00 PA |
462 | memset(&local, 0, sizeof(local)); |
463 | local.family = remote.family; | |
464 | ||
465 | spin_unlock_bh(&msk->pm.lock); | |
432d9e74 | 466 | __mptcp_subflow_connect(sk, &local, &remote); |
01cacb00 | 467 | spin_lock_bh(&msk->pm.lock); |
6a6c05a8 | 468 | |
0f5c9e3f | 469 | mptcp_pm_announce_addr(msk, &remote, true, use_port); |
84dfe367 GT |
470 | mptcp_pm_nl_add_addr_send_ack(msk); |
471 | } | |
472 | ||
473 | void mptcp_pm_nl_add_addr_send_ack(struct mptcp_sock *msk) | |
474 | { | |
475 | struct mptcp_subflow_context *subflow; | |
476 | ||
b5a7acd3 | 477 | if (!mptcp_pm_should_add_signal(msk)) |
84dfe367 GT |
478 | return; |
479 | ||
480 | __mptcp_flush_join_list(msk); | |
481 | subflow = list_first_entry_or_null(&msk->conn_list, typeof(*subflow), node); | |
482 | if (subflow) { | |
483 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
484 | u8 add_addr; | |
485 | ||
486 | spin_unlock_bh(&msk->pm.lock); | |
b5a7acd3 GT |
487 | pr_debug("send ack for add_addr%s%s", |
488 | mptcp_pm_should_add_signal_ipv6(msk) ? " [ipv6]" : "", | |
489 | mptcp_pm_should_add_signal_port(msk) ? " [port]" : ""); | |
fbe0f87a | 490 | |
84dfe367 GT |
491 | lock_sock(ssk); |
492 | tcp_send_ack(ssk); | |
493 | release_sock(ssk); | |
494 | spin_lock_bh(&msk->pm.lock); | |
495 | ||
13ad9f01 | 496 | add_addr = READ_ONCE(msk->pm.addr_signal); |
fbe0f87a GT |
497 | if (mptcp_pm_should_add_signal_ipv6(msk)) |
498 | add_addr &= ~BIT(MPTCP_ADD_ADDR_IPV6); | |
499 | if (mptcp_pm_should_add_signal_port(msk)) | |
500 | add_addr &= ~BIT(MPTCP_ADD_ADDR_PORT); | |
13ad9f01 | 501 | WRITE_ONCE(msk->pm.addr_signal, add_addr); |
84dfe367 | 502 | } |
01cacb00 PA |
503 | } |
504 | ||
06706542 GT |
505 | int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, |
506 | struct mptcp_addr_info *addr, | |
507 | u8 bkup) | |
508 | { | |
509 | struct mptcp_subflow_context *subflow; | |
510 | ||
511 | pr_debug("bkup=%d", bkup); | |
512 | ||
513 | mptcp_for_each_subflow(msk, subflow) { | |
514 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
0be2ac28 | 515 | struct sock *sk = (struct sock *)msk; |
06706542 GT |
516 | struct mptcp_addr_info local; |
517 | ||
518 | local_address((struct sock_common *)ssk, &local); | |
519 | if (!addresses_equal(&local, addr, addr->port)) | |
520 | continue; | |
521 | ||
522 | subflow->backup = bkup; | |
523 | subflow->send_mp_prio = 1; | |
524 | subflow->request_bkup = bkup; | |
0be2ac28 | 525 | __MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPPRIOTX); |
06706542 GT |
526 | |
527 | spin_unlock_bh(&msk->pm.lock); | |
528 | pr_debug("send ack for mp_prio"); | |
529 | lock_sock(ssk); | |
530 | tcp_send_ack(ssk); | |
531 | release_sock(ssk); | |
532 | spin_lock_bh(&msk->pm.lock); | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | return -EINVAL; | |
538 | } | |
539 | ||
d0876b22 GT |
540 | void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk) |
541 | { | |
542 | struct mptcp_subflow_context *subflow, *tmp; | |
543 | struct sock *sk = (struct sock *)msk; | |
544 | ||
545 | pr_debug("address rm_id %d", msk->pm.rm_id); | |
546 | ||
547 | if (!msk->pm.rm_id) | |
548 | return; | |
549 | ||
550 | if (list_empty(&msk->conn_list)) | |
551 | return; | |
552 | ||
553 | list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { | |
554 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
555 | int how = RCV_SHUTDOWN | SEND_SHUTDOWN; | |
d0876b22 GT |
556 | |
557 | if (msk->pm.rm_id != subflow->remote_id) | |
558 | continue; | |
559 | ||
560 | spin_unlock_bh(&msk->pm.lock); | |
561 | mptcp_subflow_shutdown(sk, ssk, how); | |
e16163b6 | 562 | __mptcp_close_ssk(sk, ssk, subflow); |
d0876b22 GT |
563 | spin_lock_bh(&msk->pm.lock); |
564 | ||
565 | msk->pm.add_addr_accepted--; | |
566 | msk->pm.subflows--; | |
567 | WRITE_ONCE(msk->pm.accept_addr, true); | |
568 | ||
7a7e52e3 GT |
569 | __MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMADDR); |
570 | ||
d0876b22 GT |
571 | break; |
572 | } | |
573 | } | |
574 | ||
0ee4261a GT |
575 | void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id) |
576 | { | |
577 | struct mptcp_subflow_context *subflow, *tmp; | |
578 | struct sock *sk = (struct sock *)msk; | |
579 | ||
580 | pr_debug("subflow rm_id %d", rm_id); | |
581 | ||
582 | if (!rm_id) | |
583 | return; | |
584 | ||
585 | if (list_empty(&msk->conn_list)) | |
586 | return; | |
587 | ||
588 | list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { | |
589 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
590 | int how = RCV_SHUTDOWN | SEND_SHUTDOWN; | |
0ee4261a GT |
591 | |
592 | if (rm_id != subflow->local_id) | |
593 | continue; | |
594 | ||
595 | spin_unlock_bh(&msk->pm.lock); | |
596 | mptcp_subflow_shutdown(sk, ssk, how); | |
e16163b6 | 597 | __mptcp_close_ssk(sk, ssk, subflow); |
0ee4261a GT |
598 | spin_lock_bh(&msk->pm.lock); |
599 | ||
600 | msk->pm.local_addr_used--; | |
601 | msk->pm.subflows--; | |
602 | ||
7a7e52e3 GT |
603 | __MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW); |
604 | ||
0ee4261a GT |
605 | break; |
606 | } | |
607 | } | |
608 | ||
01cacb00 PA |
609 | static bool address_use_port(struct mptcp_pm_addr_entry *entry) |
610 | { | |
ef0da3b8 | 611 | return (entry->addr.flags & |
01cacb00 PA |
612 | (MPTCP_PM_ADDR_FLAG_SIGNAL | MPTCP_PM_ADDR_FLAG_SUBFLOW)) == |
613 | MPTCP_PM_ADDR_FLAG_SIGNAL; | |
614 | } | |
615 | ||
616 | static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet, | |
617 | struct mptcp_pm_addr_entry *entry) | |
618 | { | |
619 | struct mptcp_pm_addr_entry *cur; | |
72603d20 | 620 | unsigned int addr_max; |
01cacb00 PA |
621 | int ret = -EINVAL; |
622 | ||
623 | spin_lock_bh(&pernet->lock); | |
624 | /* to keep the code simple, don't do IDR-like allocation for address ID, | |
625 | * just bail when we exceed limits | |
626 | */ | |
efd5a4c0 GT |
627 | if (pernet->next_id == MAX_ADDR_ID) |
628 | pernet->next_id = 1; | |
01cacb00 PA |
629 | if (pernet->addrs >= MPTCP_PM_ADDR_MAX) |
630 | goto out; | |
efd5a4c0 GT |
631 | if (test_bit(entry->addr.id, pernet->id_bitmap)) |
632 | goto out; | |
01cacb00 PA |
633 | |
634 | /* do not insert duplicate address, differentiate on port only | |
635 | * singled addresses | |
636 | */ | |
637 | list_for_each_entry(cur, &pernet->local_addr_list, list) { | |
638 | if (addresses_equal(&cur->addr, &entry->addr, | |
639 | address_use_port(entry) && | |
640 | address_use_port(cur))) | |
641 | goto out; | |
642 | } | |
643 | ||
efd5a4c0 GT |
644 | if (!entry->addr.id) { |
645 | find_next: | |
646 | entry->addr.id = find_next_zero_bit(pernet->id_bitmap, | |
647 | MAX_ADDR_ID + 1, | |
648 | pernet->next_id); | |
649 | if ((!entry->addr.id || entry->addr.id > MAX_ADDR_ID) && | |
650 | pernet->next_id != 1) { | |
651 | pernet->next_id = 1; | |
652 | goto find_next; | |
653 | } | |
654 | } | |
655 | ||
656 | if (!entry->addr.id || entry->addr.id > MAX_ADDR_ID) | |
657 | goto out; | |
658 | ||
659 | __set_bit(entry->addr.id, pernet->id_bitmap); | |
660 | if (entry->addr.id > pernet->next_id) | |
661 | pernet->next_id = entry->addr.id; | |
662 | ||
72603d20 GT |
663 | if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { |
664 | addr_max = pernet->add_addr_signal_max; | |
665 | WRITE_ONCE(pernet->add_addr_signal_max, addr_max + 1); | |
666 | } | |
667 | if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { | |
668 | addr_max = pernet->local_addr_max; | |
669 | WRITE_ONCE(pernet->local_addr_max, addr_max + 1); | |
670 | } | |
01cacb00 | 671 | |
01cacb00 PA |
672 | pernet->addrs++; |
673 | list_add_tail_rcu(&entry->list, &pernet->local_addr_list); | |
674 | ret = entry->addr.id; | |
675 | ||
676 | out: | |
677 | spin_unlock_bh(&pernet->lock); | |
678 | return ret; | |
679 | } | |
680 | ||
681 | int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc) | |
682 | { | |
683 | struct mptcp_pm_addr_entry *entry; | |
684 | struct mptcp_addr_info skc_local; | |
685 | struct mptcp_addr_info msk_local; | |
686 | struct pm_nl_pernet *pernet; | |
687 | int ret = -1; | |
688 | ||
689 | if (WARN_ON_ONCE(!msk)) | |
690 | return -1; | |
691 | ||
692 | /* The 0 ID mapping is defined by the first subflow, copied into the msk | |
693 | * addr | |
694 | */ | |
695 | local_address((struct sock_common *)msk, &msk_local); | |
57025817 | 696 | local_address((struct sock_common *)skc, &skc_local); |
01cacb00 PA |
697 | if (addresses_equal(&msk_local, &skc_local, false)) |
698 | return 0; | |
699 | ||
57025817 GT |
700 | if (address_zero(&skc_local)) |
701 | return 0; | |
702 | ||
01cacb00 PA |
703 | pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); |
704 | ||
705 | rcu_read_lock(); | |
706 | list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { | |
707 | if (addresses_equal(&entry->addr, &skc_local, false)) { | |
708 | ret = entry->addr.id; | |
709 | break; | |
710 | } | |
711 | } | |
712 | rcu_read_unlock(); | |
713 | if (ret >= 0) | |
714 | return ret; | |
715 | ||
716 | /* address not found, add to local list */ | |
f612eb76 | 717 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
01cacb00 PA |
718 | if (!entry) |
719 | return -ENOMEM; | |
720 | ||
01cacb00 | 721 | entry->addr = skc_local; |
ef0da3b8 PA |
722 | entry->addr.ifindex = 0; |
723 | entry->addr.flags = 0; | |
efd5a4c0 | 724 | entry->addr.id = 0; |
01cacb00 PA |
725 | ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); |
726 | if (ret < 0) | |
727 | kfree(entry); | |
728 | ||
729 | return ret; | |
730 | } | |
731 | ||
732 | void mptcp_pm_nl_data_init(struct mptcp_sock *msk) | |
733 | { | |
734 | struct mptcp_pm_data *pm = &msk->pm; | |
01cacb00 PA |
735 | bool subflows; |
736 | ||
a914e586 GT |
737 | subflows = !!mptcp_pm_get_subflows_max(msk); |
738 | WRITE_ONCE(pm->work_pending, (!!mptcp_pm_get_local_addr_max(msk) && subflows) || | |
739 | !!mptcp_pm_get_add_addr_signal_max(msk)); | |
740 | WRITE_ONCE(pm->accept_addr, !!mptcp_pm_get_add_addr_accept_max(msk) && subflows); | |
01cacb00 PA |
741 | WRITE_ONCE(pm->accept_subflow, subflows); |
742 | } | |
743 | ||
744 | #define MPTCP_PM_CMD_GRP_OFFSET 0 | |
745 | ||
746 | static const struct genl_multicast_group mptcp_pm_mcgrps[] = { | |
747 | [MPTCP_PM_CMD_GRP_OFFSET] = { .name = MPTCP_PM_CMD_GRP_NAME, }, | |
748 | }; | |
749 | ||
750 | static const struct nla_policy | |
751 | mptcp_pm_addr_policy[MPTCP_PM_ADDR_ATTR_MAX + 1] = { | |
752 | [MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, }, | |
753 | [MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, }, | |
754 | [MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, }, | |
8140860c JB |
755 | [MPTCP_PM_ADDR_ATTR_ADDR6] = |
756 | NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), | |
01cacb00 PA |
757 | [MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16 }, |
758 | [MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32 }, | |
759 | [MPTCP_PM_ADDR_ATTR_IF_IDX] = { .type = NLA_S32 }, | |
760 | }; | |
761 | ||
762 | static const struct nla_policy mptcp_pm_policy[MPTCP_PM_ATTR_MAX + 1] = { | |
763 | [MPTCP_PM_ATTR_ADDR] = | |
764 | NLA_POLICY_NESTED(mptcp_pm_addr_policy), | |
765 | [MPTCP_PM_ATTR_RCV_ADD_ADDRS] = { .type = NLA_U32, }, | |
766 | [MPTCP_PM_ATTR_SUBFLOWS] = { .type = NLA_U32, }, | |
767 | }; | |
768 | ||
769 | static int mptcp_pm_family_to_addr(int family) | |
770 | { | |
771 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
772 | if (family == AF_INET6) | |
773 | return MPTCP_PM_ADDR_ATTR_ADDR6; | |
774 | #endif | |
775 | return MPTCP_PM_ADDR_ATTR_ADDR4; | |
776 | } | |
777 | ||
778 | static int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, | |
779 | bool require_family, | |
780 | struct mptcp_pm_addr_entry *entry) | |
781 | { | |
782 | struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1]; | |
783 | int err, addr_addr; | |
784 | ||
785 | if (!attr) { | |
786 | GENL_SET_ERR_MSG(info, "missing address info"); | |
787 | return -EINVAL; | |
788 | } | |
789 | ||
790 | /* no validation needed - was already done via nested policy */ | |
791 | err = nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr, | |
792 | mptcp_pm_addr_policy, info->extack); | |
793 | if (err) | |
794 | return err; | |
795 | ||
796 | memset(entry, 0, sizeof(*entry)); | |
797 | if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) { | |
798 | if (!require_family) | |
799 | goto skip_family; | |
800 | ||
801 | NL_SET_ERR_MSG_ATTR(info->extack, attr, | |
802 | "missing family"); | |
803 | return -EINVAL; | |
804 | } | |
805 | ||
806 | entry->addr.family = nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_FAMILY]); | |
807 | if (entry->addr.family != AF_INET | |
808 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
809 | && entry->addr.family != AF_INET6 | |
810 | #endif | |
811 | ) { | |
812 | NL_SET_ERR_MSG_ATTR(info->extack, attr, | |
813 | "unknown address family"); | |
814 | return -EINVAL; | |
815 | } | |
816 | addr_addr = mptcp_pm_family_to_addr(entry->addr.family); | |
817 | if (!tb[addr_addr]) { | |
818 | NL_SET_ERR_MSG_ATTR(info->extack, attr, | |
819 | "missing address data"); | |
820 | return -EINVAL; | |
821 | } | |
822 | ||
823 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
824 | if (entry->addr.family == AF_INET6) | |
825 | entry->addr.addr6 = nla_get_in6_addr(tb[addr_addr]); | |
826 | else | |
827 | #endif | |
828 | entry->addr.addr.s_addr = nla_get_in_addr(tb[addr_addr]); | |
829 | ||
830 | skip_family: | |
ef0da3b8 PA |
831 | if (tb[MPTCP_PM_ADDR_ATTR_IF_IDX]) { |
832 | u32 val = nla_get_s32(tb[MPTCP_PM_ADDR_ATTR_IF_IDX]); | |
833 | ||
834 | entry->addr.ifindex = val; | |
835 | } | |
01cacb00 PA |
836 | |
837 | if (tb[MPTCP_PM_ADDR_ATTR_ID]) | |
838 | entry->addr.id = nla_get_u8(tb[MPTCP_PM_ADDR_ATTR_ID]); | |
839 | ||
840 | if (tb[MPTCP_PM_ADDR_ATTR_FLAGS]) | |
ef0da3b8 | 841 | entry->addr.flags = nla_get_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]); |
01cacb00 PA |
842 | |
843 | return 0; | |
844 | } | |
845 | ||
846 | static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info) | |
847 | { | |
848 | return net_generic(genl_info_net(info), pm_nl_pernet_id); | |
849 | } | |
850 | ||
875b7671 GT |
851 | static int mptcp_nl_add_subflow_or_signal_addr(struct net *net) |
852 | { | |
853 | struct mptcp_sock *msk; | |
854 | long s_slot = 0, s_num = 0; | |
855 | ||
856 | while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { | |
857 | struct sock *sk = (struct sock *)msk; | |
858 | ||
859 | if (!READ_ONCE(msk->fully_established)) | |
860 | goto next; | |
861 | ||
862 | lock_sock(sk); | |
863 | spin_lock_bh(&msk->pm.lock); | |
864 | mptcp_pm_create_subflow_or_signal_addr(msk); | |
865 | spin_unlock_bh(&msk->pm.lock); | |
866 | release_sock(sk); | |
867 | ||
868 | next: | |
869 | sock_put(sk); | |
870 | cond_resched(); | |
871 | } | |
872 | ||
873 | return 0; | |
874 | } | |
875 | ||
01cacb00 PA |
876 | static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info) |
877 | { | |
878 | struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; | |
879 | struct pm_nl_pernet *pernet = genl_info_pm_nl(info); | |
880 | struct mptcp_pm_addr_entry addr, *entry; | |
881 | int ret; | |
882 | ||
883 | ret = mptcp_pm_parse_addr(attr, info, true, &addr); | |
884 | if (ret < 0) | |
885 | return ret; | |
886 | ||
887 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
888 | if (!entry) { | |
889 | GENL_SET_ERR_MSG(info, "can't allocate addr"); | |
890 | return -ENOMEM; | |
891 | } | |
892 | ||
893 | *entry = addr; | |
894 | ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); | |
895 | if (ret < 0) { | |
896 | GENL_SET_ERR_MSG(info, "too many addresses or duplicate one"); | |
897 | kfree(entry); | |
898 | return ret; | |
899 | } | |
900 | ||
875b7671 GT |
901 | mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk)); |
902 | ||
01cacb00 PA |
903 | return 0; |
904 | } | |
905 | ||
906 | static struct mptcp_pm_addr_entry * | |
907 | __lookup_addr_by_id(struct pm_nl_pernet *pernet, unsigned int id) | |
908 | { | |
909 | struct mptcp_pm_addr_entry *entry; | |
910 | ||
911 | list_for_each_entry(entry, &pernet->local_addr_list, list) { | |
912 | if (entry->addr.id == id) | |
913 | return entry; | |
914 | } | |
915 | return NULL; | |
916 | } | |
917 | ||
b6c08380 GT |
918 | static bool remove_anno_list_by_saddr(struct mptcp_sock *msk, |
919 | struct mptcp_addr_info *addr) | |
920 | { | |
00cfd77b | 921 | struct mptcp_pm_add_entry *entry; |
b6c08380 | 922 | |
00cfd77b GT |
923 | entry = mptcp_pm_del_add_timer(msk, addr); |
924 | if (entry) { | |
925 | list_del(&entry->list); | |
926 | kfree(entry); | |
927 | return true; | |
b6c08380 GT |
928 | } |
929 | ||
930 | return false; | |
931 | } | |
932 | ||
933 | static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk, | |
934 | struct mptcp_addr_info *addr, | |
935 | bool force) | |
936 | { | |
937 | bool ret; | |
938 | ||
b6c08380 | 939 | ret = remove_anno_list_by_saddr(msk, addr); |
00cfd77b GT |
940 | if (ret || force) { |
941 | spin_lock_bh(&msk->pm.lock); | |
b6c08380 | 942 | mptcp_pm_remove_addr(msk, addr->id); |
00cfd77b GT |
943 | spin_unlock_bh(&msk->pm.lock); |
944 | } | |
b6c08380 GT |
945 | return ret; |
946 | } | |
947 | ||
948 | static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net, | |
949 | struct mptcp_addr_info *addr) | |
950 | { | |
951 | struct mptcp_sock *msk; | |
952 | long s_slot = 0, s_num = 0; | |
953 | ||
954 | pr_debug("remove_id=%d", addr->id); | |
955 | ||
956 | while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { | |
957 | struct sock *sk = (struct sock *)msk; | |
958 | bool remove_subflow; | |
959 | ||
960 | if (list_empty(&msk->conn_list)) { | |
961 | mptcp_pm_remove_anno_addr(msk, addr, false); | |
962 | goto next; | |
963 | } | |
964 | ||
965 | lock_sock(sk); | |
966 | remove_subflow = lookup_subflow_by_saddr(&msk->conn_list, addr); | |
967 | mptcp_pm_remove_anno_addr(msk, addr, remove_subflow); | |
968 | if (remove_subflow) | |
969 | mptcp_pm_remove_subflow(msk, addr->id); | |
970 | release_sock(sk); | |
971 | ||
972 | next: | |
973 | sock_put(sk); | |
974 | cond_resched(); | |
975 | } | |
976 | ||
977 | return 0; | |
978 | } | |
979 | ||
01cacb00 PA |
980 | static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info) |
981 | { | |
982 | struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; | |
983 | struct pm_nl_pernet *pernet = genl_info_pm_nl(info); | |
984 | struct mptcp_pm_addr_entry addr, *entry; | |
72603d20 | 985 | unsigned int addr_max; |
01cacb00 PA |
986 | int ret; |
987 | ||
988 | ret = mptcp_pm_parse_addr(attr, info, false, &addr); | |
989 | if (ret < 0) | |
990 | return ret; | |
991 | ||
992 | spin_lock_bh(&pernet->lock); | |
993 | entry = __lookup_addr_by_id(pernet, addr.addr.id); | |
994 | if (!entry) { | |
995 | GENL_SET_ERR_MSG(info, "address not found"); | |
b6c08380 GT |
996 | spin_unlock_bh(&pernet->lock); |
997 | return -EINVAL; | |
01cacb00 | 998 | } |
72603d20 GT |
999 | if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { |
1000 | addr_max = pernet->add_addr_signal_max; | |
1001 | WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1); | |
1002 | } | |
1003 | if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { | |
1004 | addr_max = pernet->local_addr_max; | |
1005 | WRITE_ONCE(pernet->local_addr_max, addr_max - 1); | |
1006 | } | |
01cacb00 PA |
1007 | |
1008 | pernet->addrs--; | |
1009 | list_del_rcu(&entry->list); | |
efd5a4c0 | 1010 | __clear_bit(entry->addr.id, pernet->id_bitmap); |
01cacb00 | 1011 | spin_unlock_bh(&pernet->lock); |
b6c08380 GT |
1012 | |
1013 | mptcp_nl_remove_subflow_and_signal_addr(sock_net(skb->sk), &entry->addr); | |
1014 | kfree_rcu(entry, rcu); | |
1015 | ||
01cacb00 PA |
1016 | return ret; |
1017 | } | |
1018 | ||
141694df | 1019 | static void __flush_addrs(struct net *net, struct list_head *list) |
01cacb00 | 1020 | { |
141694df | 1021 | while (!list_empty(list)) { |
01cacb00 PA |
1022 | struct mptcp_pm_addr_entry *cur; |
1023 | ||
141694df | 1024 | cur = list_entry(list->next, |
01cacb00 | 1025 | struct mptcp_pm_addr_entry, list); |
141694df | 1026 | mptcp_nl_remove_subflow_and_signal_addr(net, &cur->addr); |
01cacb00 PA |
1027 | list_del_rcu(&cur->list); |
1028 | kfree_rcu(cur, rcu); | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | static void __reset_counters(struct pm_nl_pernet *pernet) | |
1033 | { | |
72603d20 GT |
1034 | WRITE_ONCE(pernet->add_addr_signal_max, 0); |
1035 | WRITE_ONCE(pernet->add_addr_accept_max, 0); | |
1036 | WRITE_ONCE(pernet->local_addr_max, 0); | |
01cacb00 PA |
1037 | pernet->addrs = 0; |
1038 | } | |
1039 | ||
1040 | static int mptcp_nl_cmd_flush_addrs(struct sk_buff *skb, struct genl_info *info) | |
1041 | { | |
1042 | struct pm_nl_pernet *pernet = genl_info_pm_nl(info); | |
141694df | 1043 | LIST_HEAD(free_list); |
01cacb00 PA |
1044 | |
1045 | spin_lock_bh(&pernet->lock); | |
141694df | 1046 | list_splice_init(&pernet->local_addr_list, &free_list); |
01cacb00 | 1047 | __reset_counters(pernet); |
efd5a4c0 GT |
1048 | pernet->next_id = 1; |
1049 | bitmap_zero(pernet->id_bitmap, MAX_ADDR_ID + 1); | |
01cacb00 | 1050 | spin_unlock_bh(&pernet->lock); |
141694df | 1051 | __flush_addrs(sock_net(skb->sk), &free_list); |
01cacb00 PA |
1052 | return 0; |
1053 | } | |
1054 | ||
1055 | static int mptcp_nl_fill_addr(struct sk_buff *skb, | |
1056 | struct mptcp_pm_addr_entry *entry) | |
1057 | { | |
1058 | struct mptcp_addr_info *addr = &entry->addr; | |
1059 | struct nlattr *attr; | |
1060 | ||
1061 | attr = nla_nest_start(skb, MPTCP_PM_ATTR_ADDR); | |
1062 | if (!attr) | |
1063 | return -EMSGSIZE; | |
1064 | ||
1065 | if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_FAMILY, addr->family)) | |
1066 | goto nla_put_failure; | |
1067 | if (nla_put_u8(skb, MPTCP_PM_ADDR_ATTR_ID, addr->id)) | |
1068 | goto nla_put_failure; | |
ef0da3b8 | 1069 | if (nla_put_u32(skb, MPTCP_PM_ADDR_ATTR_FLAGS, entry->addr.flags)) |
01cacb00 | 1070 | goto nla_put_failure; |
ef0da3b8 PA |
1071 | if (entry->addr.ifindex && |
1072 | nla_put_s32(skb, MPTCP_PM_ADDR_ATTR_IF_IDX, entry->addr.ifindex)) | |
01cacb00 PA |
1073 | goto nla_put_failure; |
1074 | ||
b4e0f9a9 BY |
1075 | if (addr->family == AF_INET && |
1076 | nla_put_in_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR4, | |
1077 | addr->addr.s_addr)) | |
1078 | goto nla_put_failure; | |
01cacb00 | 1079 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
b4e0f9a9 BY |
1080 | else if (addr->family == AF_INET6 && |
1081 | nla_put_in6_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR6, &addr->addr6)) | |
1082 | goto nla_put_failure; | |
01cacb00 PA |
1083 | #endif |
1084 | nla_nest_end(skb, attr); | |
1085 | return 0; | |
1086 | ||
1087 | nla_put_failure: | |
1088 | nla_nest_cancel(skb, attr); | |
1089 | return -EMSGSIZE; | |
1090 | } | |
1091 | ||
1092 | static int mptcp_nl_cmd_get_addr(struct sk_buff *skb, struct genl_info *info) | |
1093 | { | |
1094 | struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; | |
1095 | struct pm_nl_pernet *pernet = genl_info_pm_nl(info); | |
1096 | struct mptcp_pm_addr_entry addr, *entry; | |
1097 | struct sk_buff *msg; | |
1098 | void *reply; | |
1099 | int ret; | |
1100 | ||
1101 | ret = mptcp_pm_parse_addr(attr, info, false, &addr); | |
1102 | if (ret < 0) | |
1103 | return ret; | |
1104 | ||
1105 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1106 | if (!msg) | |
1107 | return -ENOMEM; | |
1108 | ||
1109 | reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, | |
1110 | info->genlhdr->cmd); | |
1111 | if (!reply) { | |
1112 | GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); | |
1113 | ret = -EMSGSIZE; | |
1114 | goto fail; | |
1115 | } | |
1116 | ||
1117 | spin_lock_bh(&pernet->lock); | |
1118 | entry = __lookup_addr_by_id(pernet, addr.addr.id); | |
1119 | if (!entry) { | |
1120 | GENL_SET_ERR_MSG(info, "address not found"); | |
1121 | ret = -EINVAL; | |
1122 | goto unlock_fail; | |
1123 | } | |
1124 | ||
1125 | ret = mptcp_nl_fill_addr(msg, entry); | |
1126 | if (ret) | |
1127 | goto unlock_fail; | |
1128 | ||
1129 | genlmsg_end(msg, reply); | |
1130 | ret = genlmsg_reply(msg, info); | |
1131 | spin_unlock_bh(&pernet->lock); | |
1132 | return ret; | |
1133 | ||
1134 | unlock_fail: | |
1135 | spin_unlock_bh(&pernet->lock); | |
1136 | ||
1137 | fail: | |
1138 | nlmsg_free(msg); | |
1139 | return ret; | |
1140 | } | |
1141 | ||
1142 | static int mptcp_nl_cmd_dump_addrs(struct sk_buff *msg, | |
1143 | struct netlink_callback *cb) | |
1144 | { | |
1145 | struct net *net = sock_net(msg->sk); | |
1146 | struct mptcp_pm_addr_entry *entry; | |
1147 | struct pm_nl_pernet *pernet; | |
1148 | int id = cb->args[0]; | |
1149 | void *hdr; | |
efd5a4c0 | 1150 | int i; |
01cacb00 PA |
1151 | |
1152 | pernet = net_generic(net, pm_nl_pernet_id); | |
1153 | ||
1154 | spin_lock_bh(&pernet->lock); | |
efd5a4c0 GT |
1155 | for (i = id; i < MAX_ADDR_ID + 1; i++) { |
1156 | if (test_bit(i, pernet->id_bitmap)) { | |
1157 | entry = __lookup_addr_by_id(pernet, i); | |
1158 | if (!entry) | |
1159 | break; | |
1160 | ||
1161 | if (entry->addr.id <= id) | |
1162 | continue; | |
1163 | ||
1164 | hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, | |
1165 | cb->nlh->nlmsg_seq, &mptcp_genl_family, | |
1166 | NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); | |
1167 | if (!hdr) | |
1168 | break; | |
1169 | ||
1170 | if (mptcp_nl_fill_addr(msg, entry) < 0) { | |
1171 | genlmsg_cancel(msg, hdr); | |
1172 | break; | |
1173 | } | |
01cacb00 | 1174 | |
efd5a4c0 GT |
1175 | id = entry->addr.id; |
1176 | genlmsg_end(msg, hdr); | |
01cacb00 | 1177 | } |
01cacb00 PA |
1178 | } |
1179 | spin_unlock_bh(&pernet->lock); | |
1180 | ||
1181 | cb->args[0] = id; | |
1182 | return msg->len; | |
1183 | } | |
1184 | ||
1185 | static int parse_limit(struct genl_info *info, int id, unsigned int *limit) | |
1186 | { | |
1187 | struct nlattr *attr = info->attrs[id]; | |
1188 | ||
1189 | if (!attr) | |
1190 | return 0; | |
1191 | ||
1192 | *limit = nla_get_u32(attr); | |
1193 | if (*limit > MPTCP_PM_ADDR_MAX) { | |
1194 | GENL_SET_ERR_MSG(info, "limit greater than maximum"); | |
1195 | return -EINVAL; | |
1196 | } | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | static int | |
1201 | mptcp_nl_cmd_set_limits(struct sk_buff *skb, struct genl_info *info) | |
1202 | { | |
1203 | struct pm_nl_pernet *pernet = genl_info_pm_nl(info); | |
1204 | unsigned int rcv_addrs, subflows; | |
1205 | int ret; | |
1206 | ||
1207 | spin_lock_bh(&pernet->lock); | |
1208 | rcv_addrs = pernet->add_addr_accept_max; | |
1209 | ret = parse_limit(info, MPTCP_PM_ATTR_RCV_ADD_ADDRS, &rcv_addrs); | |
1210 | if (ret) | |
1211 | goto unlock; | |
1212 | ||
1213 | subflows = pernet->subflows_max; | |
1214 | ret = parse_limit(info, MPTCP_PM_ATTR_SUBFLOWS, &subflows); | |
1215 | if (ret) | |
1216 | goto unlock; | |
1217 | ||
1218 | WRITE_ONCE(pernet->add_addr_accept_max, rcv_addrs); | |
1219 | WRITE_ONCE(pernet->subflows_max, subflows); | |
1220 | ||
1221 | unlock: | |
1222 | spin_unlock_bh(&pernet->lock); | |
1223 | return ret; | |
1224 | } | |
1225 | ||
1226 | static int | |
1227 | mptcp_nl_cmd_get_limits(struct sk_buff *skb, struct genl_info *info) | |
1228 | { | |
1229 | struct pm_nl_pernet *pernet = genl_info_pm_nl(info); | |
1230 | struct sk_buff *msg; | |
1231 | void *reply; | |
1232 | ||
1233 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1234 | if (!msg) | |
1235 | return -ENOMEM; | |
1236 | ||
1237 | reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, | |
1238 | MPTCP_PM_CMD_GET_LIMITS); | |
1239 | if (!reply) | |
1240 | goto fail; | |
1241 | ||
1242 | if (nla_put_u32(msg, MPTCP_PM_ATTR_RCV_ADD_ADDRS, | |
1243 | READ_ONCE(pernet->add_addr_accept_max))) | |
1244 | goto fail; | |
1245 | ||
1246 | if (nla_put_u32(msg, MPTCP_PM_ATTR_SUBFLOWS, | |
1247 | READ_ONCE(pernet->subflows_max))) | |
1248 | goto fail; | |
1249 | ||
1250 | genlmsg_end(msg, reply); | |
1251 | return genlmsg_reply(msg, info); | |
1252 | ||
1253 | fail: | |
1254 | GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); | |
1255 | nlmsg_free(msg); | |
1256 | return -EMSGSIZE; | |
1257 | } | |
1258 | ||
0f9f696a GT |
1259 | static int mptcp_nl_addr_backup(struct net *net, |
1260 | struct mptcp_addr_info *addr, | |
1261 | u8 bkup) | |
1262 | { | |
1263 | long s_slot = 0, s_num = 0; | |
1264 | struct mptcp_sock *msk; | |
1265 | int ret = -EINVAL; | |
1266 | ||
1267 | while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { | |
1268 | struct sock *sk = (struct sock *)msk; | |
1269 | ||
1270 | if (list_empty(&msk->conn_list)) | |
1271 | goto next; | |
1272 | ||
1273 | lock_sock(sk); | |
1274 | spin_lock_bh(&msk->pm.lock); | |
1275 | ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, bkup); | |
1276 | spin_unlock_bh(&msk->pm.lock); | |
1277 | release_sock(sk); | |
1278 | ||
1279 | next: | |
1280 | sock_put(sk); | |
1281 | cond_resched(); | |
1282 | } | |
1283 | ||
1284 | return ret; | |
1285 | } | |
1286 | ||
1287 | static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info) | |
1288 | { | |
1289 | struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; | |
1290 | struct pm_nl_pernet *pernet = genl_info_pm_nl(info); | |
1291 | struct mptcp_pm_addr_entry addr, *entry; | |
1292 | struct net *net = sock_net(skb->sk); | |
1293 | u8 bkup = 0; | |
1294 | int ret; | |
1295 | ||
1296 | ret = mptcp_pm_parse_addr(attr, info, true, &addr); | |
1297 | if (ret < 0) | |
1298 | return ret; | |
1299 | ||
1300 | if (addr.addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP) | |
1301 | bkup = 1; | |
1302 | ||
1303 | list_for_each_entry(entry, &pernet->local_addr_list, list) { | |
1304 | if (addresses_equal(&entry->addr, &addr.addr, true)) { | |
1305 | ret = mptcp_nl_addr_backup(net, &entry->addr, bkup); | |
1306 | if (ret) | |
1307 | return ret; | |
1308 | ||
1309 | if (bkup) | |
1310 | entry->addr.flags |= MPTCP_PM_ADDR_FLAG_BACKUP; | |
1311 | else | |
1312 | entry->addr.flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP; | |
1313 | } | |
1314 | } | |
1315 | ||
1316 | return 0; | |
1317 | } | |
1318 | ||
674d3ab9 | 1319 | static const struct genl_small_ops mptcp_pm_ops[] = { |
01cacb00 PA |
1320 | { |
1321 | .cmd = MPTCP_PM_CMD_ADD_ADDR, | |
1322 | .doit = mptcp_nl_cmd_add_addr, | |
1323 | .flags = GENL_ADMIN_PERM, | |
1324 | }, | |
1325 | { | |
1326 | .cmd = MPTCP_PM_CMD_DEL_ADDR, | |
1327 | .doit = mptcp_nl_cmd_del_addr, | |
1328 | .flags = GENL_ADMIN_PERM, | |
1329 | }, | |
1330 | { | |
1331 | .cmd = MPTCP_PM_CMD_FLUSH_ADDRS, | |
1332 | .doit = mptcp_nl_cmd_flush_addrs, | |
1333 | .flags = GENL_ADMIN_PERM, | |
1334 | }, | |
1335 | { | |
1336 | .cmd = MPTCP_PM_CMD_GET_ADDR, | |
1337 | .doit = mptcp_nl_cmd_get_addr, | |
1338 | .dumpit = mptcp_nl_cmd_dump_addrs, | |
1339 | }, | |
1340 | { | |
1341 | .cmd = MPTCP_PM_CMD_SET_LIMITS, | |
1342 | .doit = mptcp_nl_cmd_set_limits, | |
1343 | .flags = GENL_ADMIN_PERM, | |
1344 | }, | |
1345 | { | |
1346 | .cmd = MPTCP_PM_CMD_GET_LIMITS, | |
1347 | .doit = mptcp_nl_cmd_get_limits, | |
1348 | }, | |
0f9f696a GT |
1349 | { |
1350 | .cmd = MPTCP_PM_CMD_SET_FLAGS, | |
1351 | .doit = mptcp_nl_cmd_set_flags, | |
1352 | .flags = GENL_ADMIN_PERM, | |
1353 | }, | |
01cacb00 PA |
1354 | }; |
1355 | ||
1356 | static struct genl_family mptcp_genl_family __ro_after_init = { | |
1357 | .name = MPTCP_PM_NAME, | |
1358 | .version = MPTCP_PM_VER, | |
1359 | .maxattr = MPTCP_PM_ATTR_MAX, | |
1360 | .policy = mptcp_pm_policy, | |
1361 | .netnsok = true, | |
1362 | .module = THIS_MODULE, | |
66a9b928 JK |
1363 | .small_ops = mptcp_pm_ops, |
1364 | .n_small_ops = ARRAY_SIZE(mptcp_pm_ops), | |
01cacb00 PA |
1365 | .mcgrps = mptcp_pm_mcgrps, |
1366 | .n_mcgrps = ARRAY_SIZE(mptcp_pm_mcgrps), | |
1367 | }; | |
1368 | ||
1369 | static int __net_init pm_nl_init_net(struct net *net) | |
1370 | { | |
1371 | struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id); | |
1372 | ||
1373 | INIT_LIST_HEAD_RCU(&pernet->local_addr_list); | |
1374 | __reset_counters(pernet); | |
1375 | pernet->next_id = 1; | |
efd5a4c0 | 1376 | bitmap_zero(pernet->id_bitmap, MAX_ADDR_ID + 1); |
01cacb00 PA |
1377 | spin_lock_init(&pernet->lock); |
1378 | return 0; | |
1379 | } | |
1380 | ||
1381 | static void __net_exit pm_nl_exit_net(struct list_head *net_list) | |
1382 | { | |
1383 | struct net *net; | |
1384 | ||
1385 | list_for_each_entry(net, net_list, exit_list) { | |
141694df GT |
1386 | struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id); |
1387 | ||
01cacb00 PA |
1388 | /* net is removed from namespace list, can't race with |
1389 | * other modifiers | |
1390 | */ | |
141694df | 1391 | __flush_addrs(net, &pernet->local_addr_list); |
01cacb00 PA |
1392 | } |
1393 | } | |
1394 | ||
1395 | static struct pernet_operations mptcp_pm_pernet_ops = { | |
1396 | .init = pm_nl_init_net, | |
1397 | .exit_batch = pm_nl_exit_net, | |
1398 | .id = &pm_nl_pernet_id, | |
1399 | .size = sizeof(struct pm_nl_pernet), | |
1400 | }; | |
1401 | ||
d39dceca | 1402 | void __init mptcp_pm_nl_init(void) |
01cacb00 PA |
1403 | { |
1404 | if (register_pernet_subsys(&mptcp_pm_pernet_ops) < 0) | |
1405 | panic("Failed to register MPTCP PM pernet subsystem.\n"); | |
1406 | ||
1407 | if (genl_register_family(&mptcp_genl_family)) | |
1408 | panic("Failed to register MPTCP PM netlink family\n"); | |
1409 | } |