Commit | Line | Data |
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ab7ac4eb TH |
1 | #include <linux/bpf.h> |
2 | #include <linux/errno.h> | |
3 | #include <linux/errqueue.h> | |
4 | #include <linux/file.h> | |
5 | #include <linux/in.h> | |
6 | #include <linux/kernel.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/net.h> | |
9 | #include <linux/netdevice.h> | |
10 | #include <linux/poll.h> | |
11 | #include <linux/rculist.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/socket.h> | |
14 | #include <linux/uaccess.h> | |
15 | #include <linux/workqueue.h> | |
16 | #include <net/kcm.h> | |
17 | #include <net/netns/generic.h> | |
18 | #include <net/sock.h> | |
19 | #include <net/tcp.h> | |
20 | #include <uapi/linux/kcm.h> | |
21 | ||
22 | unsigned int kcm_net_id; | |
23 | ||
24 | static struct kmem_cache *kcm_psockp __read_mostly; | |
25 | static struct kmem_cache *kcm_muxp __read_mostly; | |
26 | static struct workqueue_struct *kcm_wq; | |
27 | ||
28 | static inline struct kcm_sock *kcm_sk(const struct sock *sk) | |
29 | { | |
30 | return (struct kcm_sock *)sk; | |
31 | } | |
32 | ||
33 | static inline struct kcm_tx_msg *kcm_tx_msg(struct sk_buff *skb) | |
34 | { | |
35 | return (struct kcm_tx_msg *)skb->cb; | |
36 | } | |
37 | ||
38 | static inline struct kcm_rx_msg *kcm_rx_msg(struct sk_buff *skb) | |
39 | { | |
40 | return (struct kcm_rx_msg *)((void *)skb->cb + | |
41 | offsetof(struct qdisc_skb_cb, data)); | |
42 | } | |
43 | ||
44 | static void report_csk_error(struct sock *csk, int err) | |
45 | { | |
46 | csk->sk_err = EPIPE; | |
47 | csk->sk_error_report(csk); | |
48 | } | |
49 | ||
50 | /* Callback lock held */ | |
51 | static void kcm_abort_rx_psock(struct kcm_psock *psock, int err, | |
52 | struct sk_buff *skb) | |
53 | { | |
54 | struct sock *csk = psock->sk; | |
55 | ||
56 | /* Unrecoverable error in receive */ | |
57 | ||
29152a34 TH |
58 | del_timer(&psock->rx_msg_timer); |
59 | ||
ab7ac4eb TH |
60 | if (psock->rx_stopped) |
61 | return; | |
62 | ||
63 | psock->rx_stopped = 1; | |
cd6e111b | 64 | KCM_STATS_INCR(psock->stats.rx_aborts); |
ab7ac4eb TH |
65 | |
66 | /* Report an error on the lower socket */ | |
67 | report_csk_error(csk, err); | |
68 | } | |
69 | ||
70 | static void kcm_abort_tx_psock(struct kcm_psock *psock, int err, | |
71 | bool wakeup_kcm) | |
72 | { | |
73 | struct sock *csk = psock->sk; | |
74 | struct kcm_mux *mux = psock->mux; | |
75 | ||
76 | /* Unrecoverable error in transmit */ | |
77 | ||
78 | spin_lock_bh(&mux->lock); | |
79 | ||
80 | if (psock->tx_stopped) { | |
81 | spin_unlock_bh(&mux->lock); | |
82 | return; | |
83 | } | |
84 | ||
85 | psock->tx_stopped = 1; | |
cd6e111b | 86 | KCM_STATS_INCR(psock->stats.tx_aborts); |
ab7ac4eb TH |
87 | |
88 | if (!psock->tx_kcm) { | |
89 | /* Take off psocks_avail list */ | |
90 | list_del(&psock->psock_avail_list); | |
91 | } else if (wakeup_kcm) { | |
92 | /* In this case psock is being aborted while outside of | |
93 | * write_msgs and psock is reserved. Schedule tx_work | |
94 | * to handle the failure there. Need to commit tx_stopped | |
95 | * before queuing work. | |
96 | */ | |
97 | smp_mb(); | |
98 | ||
99 | queue_work(kcm_wq, &psock->tx_kcm->tx_work); | |
100 | } | |
101 | ||
102 | spin_unlock_bh(&mux->lock); | |
103 | ||
104 | /* Report error on lower socket */ | |
105 | report_csk_error(csk, err); | |
106 | } | |
107 | ||
cd6e111b TH |
108 | /* RX mux lock held. */ |
109 | static void kcm_update_rx_mux_stats(struct kcm_mux *mux, | |
110 | struct kcm_psock *psock) | |
111 | { | |
112 | KCM_STATS_ADD(mux->stats.rx_bytes, | |
113 | psock->stats.rx_bytes - psock->saved_rx_bytes); | |
114 | mux->stats.rx_msgs += | |
115 | psock->stats.rx_msgs - psock->saved_rx_msgs; | |
116 | psock->saved_rx_msgs = psock->stats.rx_msgs; | |
117 | psock->saved_rx_bytes = psock->stats.rx_bytes; | |
118 | } | |
119 | ||
120 | static void kcm_update_tx_mux_stats(struct kcm_mux *mux, | |
121 | struct kcm_psock *psock) | |
122 | { | |
123 | KCM_STATS_ADD(mux->stats.tx_bytes, | |
124 | psock->stats.tx_bytes - psock->saved_tx_bytes); | |
125 | mux->stats.tx_msgs += | |
126 | psock->stats.tx_msgs - psock->saved_tx_msgs; | |
127 | psock->saved_tx_msgs = psock->stats.tx_msgs; | |
128 | psock->saved_tx_bytes = psock->stats.tx_bytes; | |
129 | } | |
130 | ||
ab7ac4eb TH |
131 | static int kcm_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
132 | ||
133 | /* KCM is ready to receive messages on its queue-- either the KCM is new or | |
134 | * has become unblocked after being blocked on full socket buffer. Queue any | |
135 | * pending ready messages on a psock. RX mux lock held. | |
136 | */ | |
137 | static void kcm_rcv_ready(struct kcm_sock *kcm) | |
138 | { | |
139 | struct kcm_mux *mux = kcm->mux; | |
140 | struct kcm_psock *psock; | |
141 | struct sk_buff *skb; | |
142 | ||
143 | if (unlikely(kcm->rx_wait || kcm->rx_psock || kcm->rx_disabled)) | |
144 | return; | |
145 | ||
146 | while (unlikely((skb = __skb_dequeue(&mux->rx_hold_queue)))) { | |
147 | if (kcm_queue_rcv_skb(&kcm->sk, skb)) { | |
148 | /* Assuming buffer limit has been reached */ | |
149 | skb_queue_head(&mux->rx_hold_queue, skb); | |
150 | WARN_ON(!sk_rmem_alloc_get(&kcm->sk)); | |
151 | return; | |
152 | } | |
153 | } | |
154 | ||
155 | while (!list_empty(&mux->psocks_ready)) { | |
156 | psock = list_first_entry(&mux->psocks_ready, struct kcm_psock, | |
157 | psock_ready_list); | |
158 | ||
159 | if (kcm_queue_rcv_skb(&kcm->sk, psock->ready_rx_msg)) { | |
160 | /* Assuming buffer limit has been reached */ | |
161 | WARN_ON(!sk_rmem_alloc_get(&kcm->sk)); | |
162 | return; | |
163 | } | |
164 | ||
165 | /* Consumed the ready message on the psock. Schedule rx_work to | |
166 | * get more messages. | |
167 | */ | |
168 | list_del(&psock->psock_ready_list); | |
169 | psock->ready_rx_msg = NULL; | |
170 | ||
171 | /* Commit clearing of ready_rx_msg for queuing work */ | |
172 | smp_mb(); | |
173 | ||
174 | queue_work(kcm_wq, &psock->rx_work); | |
175 | } | |
176 | ||
177 | /* Buffer limit is okay now, add to ready list */ | |
178 | list_add_tail(&kcm->wait_rx_list, | |
179 | &kcm->mux->kcm_rx_waiters); | |
180 | kcm->rx_wait = true; | |
181 | } | |
182 | ||
183 | static void kcm_rfree(struct sk_buff *skb) | |
184 | { | |
185 | struct sock *sk = skb->sk; | |
186 | struct kcm_sock *kcm = kcm_sk(sk); | |
187 | struct kcm_mux *mux = kcm->mux; | |
188 | unsigned int len = skb->truesize; | |
189 | ||
190 | sk_mem_uncharge(sk, len); | |
191 | atomic_sub(len, &sk->sk_rmem_alloc); | |
192 | ||
193 | /* For reading rx_wait and rx_psock without holding lock */ | |
194 | smp_mb__after_atomic(); | |
195 | ||
196 | if (!kcm->rx_wait && !kcm->rx_psock && | |
197 | sk_rmem_alloc_get(sk) < sk->sk_rcvlowat) { | |
198 | spin_lock_bh(&mux->rx_lock); | |
199 | kcm_rcv_ready(kcm); | |
200 | spin_unlock_bh(&mux->rx_lock); | |
201 | } | |
202 | } | |
203 | ||
204 | static int kcm_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
205 | { | |
206 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
207 | ||
208 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) | |
209 | return -ENOMEM; | |
210 | ||
211 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) | |
212 | return -ENOBUFS; | |
213 | ||
214 | skb->dev = NULL; | |
215 | ||
216 | skb_orphan(skb); | |
217 | skb->sk = sk; | |
218 | skb->destructor = kcm_rfree; | |
219 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
220 | sk_mem_charge(sk, skb->truesize); | |
221 | ||
222 | skb_queue_tail(list, skb); | |
223 | ||
224 | if (!sock_flag(sk, SOCK_DEAD)) | |
225 | sk->sk_data_ready(sk); | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | /* Requeue received messages for a kcm socket to other kcm sockets. This is | |
231 | * called with a kcm socket is receive disabled. | |
232 | * RX mux lock held. | |
233 | */ | |
234 | static void requeue_rx_msgs(struct kcm_mux *mux, struct sk_buff_head *head) | |
235 | { | |
236 | struct sk_buff *skb; | |
237 | struct kcm_sock *kcm; | |
238 | ||
239 | while ((skb = __skb_dequeue(head))) { | |
240 | /* Reset destructor to avoid calling kcm_rcv_ready */ | |
241 | skb->destructor = sock_rfree; | |
242 | skb_orphan(skb); | |
243 | try_again: | |
244 | if (list_empty(&mux->kcm_rx_waiters)) { | |
245 | skb_queue_tail(&mux->rx_hold_queue, skb); | |
246 | continue; | |
247 | } | |
248 | ||
249 | kcm = list_first_entry(&mux->kcm_rx_waiters, | |
250 | struct kcm_sock, wait_rx_list); | |
251 | ||
252 | if (kcm_queue_rcv_skb(&kcm->sk, skb)) { | |
253 | /* Should mean socket buffer full */ | |
254 | list_del(&kcm->wait_rx_list); | |
255 | kcm->rx_wait = false; | |
256 | ||
257 | /* Commit rx_wait to read in kcm_free */ | |
258 | smp_wmb(); | |
259 | ||
260 | goto try_again; | |
261 | } | |
262 | } | |
263 | } | |
264 | ||
265 | /* Lower sock lock held */ | |
266 | static struct kcm_sock *reserve_rx_kcm(struct kcm_psock *psock, | |
267 | struct sk_buff *head) | |
268 | { | |
269 | struct kcm_mux *mux = psock->mux; | |
270 | struct kcm_sock *kcm; | |
271 | ||
272 | WARN_ON(psock->ready_rx_msg); | |
273 | ||
274 | if (psock->rx_kcm) | |
275 | return psock->rx_kcm; | |
276 | ||
277 | spin_lock_bh(&mux->rx_lock); | |
278 | ||
279 | if (psock->rx_kcm) { | |
280 | spin_unlock_bh(&mux->rx_lock); | |
281 | return psock->rx_kcm; | |
282 | } | |
283 | ||
cd6e111b TH |
284 | kcm_update_rx_mux_stats(mux, psock); |
285 | ||
ab7ac4eb TH |
286 | if (list_empty(&mux->kcm_rx_waiters)) { |
287 | psock->ready_rx_msg = head; | |
288 | list_add_tail(&psock->psock_ready_list, | |
289 | &mux->psocks_ready); | |
290 | spin_unlock_bh(&mux->rx_lock); | |
291 | return NULL; | |
292 | } | |
293 | ||
294 | kcm = list_first_entry(&mux->kcm_rx_waiters, | |
295 | struct kcm_sock, wait_rx_list); | |
296 | list_del(&kcm->wait_rx_list); | |
297 | kcm->rx_wait = false; | |
298 | ||
299 | psock->rx_kcm = kcm; | |
300 | kcm->rx_psock = psock; | |
301 | ||
302 | spin_unlock_bh(&mux->rx_lock); | |
303 | ||
304 | return kcm; | |
305 | } | |
306 | ||
307 | static void kcm_done(struct kcm_sock *kcm); | |
308 | ||
309 | static void kcm_done_work(struct work_struct *w) | |
310 | { | |
311 | kcm_done(container_of(w, struct kcm_sock, done_work)); | |
312 | } | |
313 | ||
314 | /* Lower sock held */ | |
315 | static void unreserve_rx_kcm(struct kcm_psock *psock, | |
316 | bool rcv_ready) | |
317 | { | |
318 | struct kcm_sock *kcm = psock->rx_kcm; | |
319 | struct kcm_mux *mux = psock->mux; | |
320 | ||
321 | if (!kcm) | |
322 | return; | |
323 | ||
324 | spin_lock_bh(&mux->rx_lock); | |
325 | ||
326 | psock->rx_kcm = NULL; | |
327 | kcm->rx_psock = NULL; | |
328 | ||
329 | /* Commit kcm->rx_psock before sk_rmem_alloc_get to sync with | |
330 | * kcm_rfree | |
331 | */ | |
332 | smp_mb(); | |
333 | ||
334 | if (unlikely(kcm->done)) { | |
335 | spin_unlock_bh(&mux->rx_lock); | |
336 | ||
337 | /* Need to run kcm_done in a task since we need to qcquire | |
338 | * callback locks which may already be held here. | |
339 | */ | |
340 | INIT_WORK(&kcm->done_work, kcm_done_work); | |
341 | schedule_work(&kcm->done_work); | |
342 | return; | |
343 | } | |
344 | ||
345 | if (unlikely(kcm->rx_disabled)) { | |
346 | requeue_rx_msgs(mux, &kcm->sk.sk_receive_queue); | |
347 | } else if (rcv_ready || unlikely(!sk_rmem_alloc_get(&kcm->sk))) { | |
348 | /* Check for degenerative race with rx_wait that all | |
349 | * data was dequeued (accounted for in kcm_rfree). | |
350 | */ | |
351 | kcm_rcv_ready(kcm); | |
352 | } | |
353 | spin_unlock_bh(&mux->rx_lock); | |
354 | } | |
355 | ||
29152a34 TH |
356 | static void kcm_start_rx_timer(struct kcm_psock *psock) |
357 | { | |
358 | if (psock->sk->sk_rcvtimeo) | |
359 | mod_timer(&psock->rx_msg_timer, psock->sk->sk_rcvtimeo); | |
360 | } | |
361 | ||
ab7ac4eb TH |
362 | /* Macro to invoke filter function. */ |
363 | #define KCM_RUN_FILTER(prog, ctx) \ | |
364 | (*prog->bpf_func)(ctx, prog->insnsi) | |
365 | ||
366 | /* Lower socket lock held */ | |
367 | static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb, | |
368 | unsigned int orig_offset, size_t orig_len) | |
369 | { | |
370 | struct kcm_psock *psock = (struct kcm_psock *)desc->arg.data; | |
371 | struct kcm_rx_msg *rxm; | |
372 | struct kcm_sock *kcm; | |
373 | struct sk_buff *head, *skb; | |
374 | size_t eaten = 0, cand_len; | |
375 | ssize_t extra; | |
376 | int err; | |
377 | bool cloned_orig = false; | |
378 | ||
379 | if (psock->ready_rx_msg) | |
380 | return 0; | |
381 | ||
382 | head = psock->rx_skb_head; | |
383 | if (head) { | |
384 | /* Message already in progress */ | |
385 | ||
7ced95ef TH |
386 | rxm = kcm_rx_msg(head); |
387 | if (unlikely(rxm->early_eaten)) { | |
388 | /* Already some number of bytes on the receive sock | |
389 | * data saved in rx_skb_head, just indicate they | |
390 | * are consumed. | |
391 | */ | |
392 | eaten = orig_len <= rxm->early_eaten ? | |
393 | orig_len : rxm->early_eaten; | |
394 | rxm->early_eaten -= eaten; | |
395 | ||
396 | return eaten; | |
397 | } | |
398 | ||
ab7ac4eb TH |
399 | if (unlikely(orig_offset)) { |
400 | /* Getting data with a non-zero offset when a message is | |
401 | * in progress is not expected. If it does happen, we | |
402 | * need to clone and pull since we can't deal with | |
403 | * offsets in the skbs for a message expect in the head. | |
404 | */ | |
405 | orig_skb = skb_clone(orig_skb, GFP_ATOMIC); | |
406 | if (!orig_skb) { | |
cd6e111b | 407 | KCM_STATS_INCR(psock->stats.rx_mem_fail); |
ab7ac4eb TH |
408 | desc->error = -ENOMEM; |
409 | return 0; | |
410 | } | |
411 | if (!pskb_pull(orig_skb, orig_offset)) { | |
cd6e111b | 412 | KCM_STATS_INCR(psock->stats.rx_mem_fail); |
ab7ac4eb TH |
413 | kfree_skb(orig_skb); |
414 | desc->error = -ENOMEM; | |
415 | return 0; | |
416 | } | |
417 | cloned_orig = true; | |
418 | orig_offset = 0; | |
419 | } | |
420 | ||
421 | if (!psock->rx_skb_nextp) { | |
422 | /* We are going to append to the frags_list of head. | |
423 | * Need to unshare the frag_list. | |
424 | */ | |
425 | err = skb_unclone(head, GFP_ATOMIC); | |
426 | if (err) { | |
cd6e111b | 427 | KCM_STATS_INCR(psock->stats.rx_mem_fail); |
ab7ac4eb TH |
428 | desc->error = err; |
429 | return 0; | |
430 | } | |
431 | ||
432 | if (unlikely(skb_shinfo(head)->frag_list)) { | |
433 | /* We can't append to an sk_buff that already | |
434 | * has a frag_list. We create a new head, point | |
435 | * the frag_list of that to the old head, and | |
436 | * then are able to use the old head->next for | |
437 | * appending to the message. | |
438 | */ | |
439 | if (WARN_ON(head->next)) { | |
440 | desc->error = -EINVAL; | |
441 | return 0; | |
442 | } | |
443 | ||
444 | skb = alloc_skb(0, GFP_ATOMIC); | |
445 | if (!skb) { | |
cd6e111b | 446 | KCM_STATS_INCR(psock->stats.rx_mem_fail); |
ab7ac4eb TH |
447 | desc->error = -ENOMEM; |
448 | return 0; | |
449 | } | |
450 | skb->len = head->len; | |
451 | skb->data_len = head->len; | |
452 | skb->truesize = head->truesize; | |
453 | *kcm_rx_msg(skb) = *kcm_rx_msg(head); | |
454 | psock->rx_skb_nextp = &head->next; | |
455 | skb_shinfo(skb)->frag_list = head; | |
456 | psock->rx_skb_head = skb; | |
457 | head = skb; | |
458 | } else { | |
459 | psock->rx_skb_nextp = | |
460 | &skb_shinfo(head)->frag_list; | |
461 | } | |
462 | } | |
463 | } | |
464 | ||
465 | while (eaten < orig_len) { | |
466 | /* Always clone since we will consume something */ | |
467 | skb = skb_clone(orig_skb, GFP_ATOMIC); | |
468 | if (!skb) { | |
cd6e111b | 469 | KCM_STATS_INCR(psock->stats.rx_mem_fail); |
ab7ac4eb TH |
470 | desc->error = -ENOMEM; |
471 | break; | |
472 | } | |
473 | ||
474 | cand_len = orig_len - eaten; | |
475 | ||
476 | head = psock->rx_skb_head; | |
477 | if (!head) { | |
478 | head = skb; | |
479 | psock->rx_skb_head = head; | |
480 | /* Will set rx_skb_nextp on next packet if needed */ | |
481 | psock->rx_skb_nextp = NULL; | |
482 | rxm = kcm_rx_msg(head); | |
483 | memset(rxm, 0, sizeof(*rxm)); | |
484 | rxm->offset = orig_offset + eaten; | |
485 | } else { | |
486 | /* Unclone since we may be appending to an skb that we | |
487 | * already share a frag_list with. | |
488 | */ | |
489 | err = skb_unclone(skb, GFP_ATOMIC); | |
490 | if (err) { | |
cd6e111b | 491 | KCM_STATS_INCR(psock->stats.rx_mem_fail); |
ab7ac4eb TH |
492 | desc->error = err; |
493 | break; | |
494 | } | |
495 | ||
496 | rxm = kcm_rx_msg(head); | |
497 | *psock->rx_skb_nextp = skb; | |
498 | psock->rx_skb_nextp = &skb->next; | |
499 | head->data_len += skb->len; | |
500 | head->len += skb->len; | |
501 | head->truesize += skb->truesize; | |
502 | } | |
503 | ||
504 | if (!rxm->full_len) { | |
505 | ssize_t len; | |
506 | ||
507 | len = KCM_RUN_FILTER(psock->bpf_prog, head); | |
508 | ||
509 | if (!len) { | |
510 | /* Need more header to determine length */ | |
29152a34 TH |
511 | if (!rxm->accum_len) { |
512 | /* Start RX timer for new message */ | |
513 | kcm_start_rx_timer(psock); | |
514 | } | |
ab7ac4eb TH |
515 | rxm->accum_len += cand_len; |
516 | eaten += cand_len; | |
cd6e111b | 517 | KCM_STATS_INCR(psock->stats.rx_need_more_hdr); |
ab7ac4eb TH |
518 | WARN_ON(eaten != orig_len); |
519 | break; | |
7ced95ef TH |
520 | } else if (len > psock->sk->sk_rcvbuf) { |
521 | /* Message length exceeds maximum allowed */ | |
522 | KCM_STATS_INCR(psock->stats.rx_msg_too_big); | |
523 | desc->error = -EMSGSIZE; | |
524 | psock->rx_skb_head = NULL; | |
525 | kcm_abort_rx_psock(psock, EMSGSIZE, head); | |
526 | break; | |
ab7ac4eb TH |
527 | } else if (len <= (ssize_t)head->len - |
528 | skb->len - rxm->offset) { | |
529 | /* Length must be into new skb (and also | |
530 | * greater than zero) | |
531 | */ | |
cd6e111b | 532 | KCM_STATS_INCR(psock->stats.rx_bad_hdr_len); |
ab7ac4eb TH |
533 | desc->error = -EPROTO; |
534 | psock->rx_skb_head = NULL; | |
535 | kcm_abort_rx_psock(psock, EPROTO, head); | |
536 | break; | |
537 | } | |
538 | ||
539 | rxm->full_len = len; | |
540 | } | |
541 | ||
542 | extra = (ssize_t)(rxm->accum_len + cand_len) - rxm->full_len; | |
543 | ||
544 | if (extra < 0) { | |
545 | /* Message not complete yet. */ | |
7ced95ef TH |
546 | if (rxm->full_len - rxm->accum_len > |
547 | tcp_inq(psock->sk)) { | |
548 | /* Don't have the whole messages in the socket | |
549 | * buffer. Set psock->rx_need_bytes to wait for | |
550 | * the rest of the message. Also, set "early | |
551 | * eaten" since we've already buffered the skb | |
552 | * but don't consume yet per tcp_read_sock. | |
553 | */ | |
554 | ||
29152a34 TH |
555 | if (!rxm->accum_len) { |
556 | /* Start RX timer for new message */ | |
557 | kcm_start_rx_timer(psock); | |
558 | } | |
559 | ||
7ced95ef TH |
560 | psock->rx_need_bytes = rxm->full_len - |
561 | rxm->accum_len; | |
562 | rxm->accum_len += cand_len; | |
563 | rxm->early_eaten = cand_len; | |
564 | KCM_STATS_ADD(psock->stats.rx_bytes, cand_len); | |
565 | desc->count = 0; /* Stop reading socket */ | |
566 | break; | |
567 | } | |
ab7ac4eb TH |
568 | rxm->accum_len += cand_len; |
569 | eaten += cand_len; | |
570 | WARN_ON(eaten != orig_len); | |
571 | break; | |
572 | } | |
573 | ||
574 | /* Positive extra indicates ore bytes than needed for the | |
575 | * message | |
576 | */ | |
577 | ||
578 | WARN_ON(extra > cand_len); | |
579 | ||
580 | eaten += (cand_len - extra); | |
581 | ||
582 | /* Hurray, we have a new message! */ | |
29152a34 | 583 | del_timer(&psock->rx_msg_timer); |
ab7ac4eb | 584 | psock->rx_skb_head = NULL; |
cd6e111b | 585 | KCM_STATS_INCR(psock->stats.rx_msgs); |
ab7ac4eb TH |
586 | |
587 | try_queue: | |
588 | kcm = reserve_rx_kcm(psock, head); | |
589 | if (!kcm) { | |
590 | /* Unable to reserve a KCM, message is held in psock. */ | |
591 | break; | |
592 | } | |
593 | ||
594 | if (kcm_queue_rcv_skb(&kcm->sk, head)) { | |
595 | /* Should mean socket buffer full */ | |
596 | unreserve_rx_kcm(psock, false); | |
597 | goto try_queue; | |
598 | } | |
599 | } | |
600 | ||
601 | if (cloned_orig) | |
602 | kfree_skb(orig_skb); | |
603 | ||
cd6e111b TH |
604 | KCM_STATS_ADD(psock->stats.rx_bytes, eaten); |
605 | ||
ab7ac4eb TH |
606 | return eaten; |
607 | } | |
608 | ||
609 | /* Called with lock held on lower socket */ | |
610 | static int psock_tcp_read_sock(struct kcm_psock *psock) | |
611 | { | |
612 | read_descriptor_t desc; | |
613 | ||
614 | desc.arg.data = psock; | |
615 | desc.error = 0; | |
616 | desc.count = 1; /* give more than one skb per call */ | |
617 | ||
618 | /* sk should be locked here, so okay to do tcp_read_sock */ | |
619 | tcp_read_sock(psock->sk, &desc, kcm_tcp_recv); | |
620 | ||
621 | unreserve_rx_kcm(psock, true); | |
622 | ||
623 | return desc.error; | |
624 | } | |
625 | ||
626 | /* Lower sock lock held */ | |
627 | static void psock_tcp_data_ready(struct sock *sk) | |
628 | { | |
629 | struct kcm_psock *psock; | |
630 | ||
631 | read_lock_bh(&sk->sk_callback_lock); | |
632 | ||
633 | psock = (struct kcm_psock *)sk->sk_user_data; | |
634 | if (unlikely(!psock || psock->rx_stopped)) | |
635 | goto out; | |
636 | ||
637 | if (psock->ready_rx_msg) | |
638 | goto out; | |
639 | ||
7ced95ef TH |
640 | if (psock->rx_need_bytes) { |
641 | if (tcp_inq(sk) >= psock->rx_need_bytes) | |
642 | psock->rx_need_bytes = 0; | |
643 | else | |
644 | goto out; | |
645 | } | |
646 | ||
ab7ac4eb TH |
647 | if (psock_tcp_read_sock(psock) == -ENOMEM) |
648 | queue_delayed_work(kcm_wq, &psock->rx_delayed_work, 0); | |
649 | ||
650 | out: | |
651 | read_unlock_bh(&sk->sk_callback_lock); | |
652 | } | |
653 | ||
654 | static void do_psock_rx_work(struct kcm_psock *psock) | |
655 | { | |
656 | read_descriptor_t rd_desc; | |
657 | struct sock *csk = psock->sk; | |
658 | ||
659 | /* We need the read lock to synchronize with psock_tcp_data_ready. We | |
660 | * need the socket lock for calling tcp_read_sock. | |
661 | */ | |
662 | lock_sock(csk); | |
663 | read_lock_bh(&csk->sk_callback_lock); | |
664 | ||
665 | if (unlikely(csk->sk_user_data != psock)) | |
666 | goto out; | |
667 | ||
668 | if (unlikely(psock->rx_stopped)) | |
669 | goto out; | |
670 | ||
671 | if (psock->ready_rx_msg) | |
672 | goto out; | |
673 | ||
674 | rd_desc.arg.data = psock; | |
675 | ||
676 | if (psock_tcp_read_sock(psock) == -ENOMEM) | |
677 | queue_delayed_work(kcm_wq, &psock->rx_delayed_work, 0); | |
678 | ||
679 | out: | |
680 | read_unlock_bh(&csk->sk_callback_lock); | |
681 | release_sock(csk); | |
682 | } | |
683 | ||
684 | static void psock_rx_work(struct work_struct *w) | |
685 | { | |
686 | do_psock_rx_work(container_of(w, struct kcm_psock, rx_work)); | |
687 | } | |
688 | ||
689 | static void psock_rx_delayed_work(struct work_struct *w) | |
690 | { | |
691 | do_psock_rx_work(container_of(w, struct kcm_psock, | |
692 | rx_delayed_work.work)); | |
693 | } | |
694 | ||
695 | static void psock_tcp_state_change(struct sock *sk) | |
696 | { | |
697 | /* TCP only does a POLLIN for a half close. Do a POLLHUP here | |
698 | * since application will normally not poll with POLLIN | |
699 | * on the TCP sockets. | |
700 | */ | |
701 | ||
702 | report_csk_error(sk, EPIPE); | |
703 | } | |
704 | ||
705 | static void psock_tcp_write_space(struct sock *sk) | |
706 | { | |
707 | struct kcm_psock *psock; | |
708 | struct kcm_mux *mux; | |
709 | struct kcm_sock *kcm; | |
710 | ||
711 | read_lock_bh(&sk->sk_callback_lock); | |
712 | ||
713 | psock = (struct kcm_psock *)sk->sk_user_data; | |
714 | if (unlikely(!psock)) | |
715 | goto out; | |
716 | ||
717 | mux = psock->mux; | |
718 | ||
719 | spin_lock_bh(&mux->lock); | |
720 | ||
721 | /* Check if the socket is reserved so someone is waiting for sending. */ | |
722 | kcm = psock->tx_kcm; | |
723 | if (kcm) | |
724 | queue_work(kcm_wq, &kcm->tx_work); | |
725 | ||
726 | spin_unlock_bh(&mux->lock); | |
727 | out: | |
728 | read_unlock_bh(&sk->sk_callback_lock); | |
729 | } | |
730 | ||
731 | static void unreserve_psock(struct kcm_sock *kcm); | |
732 | ||
733 | /* kcm sock is locked. */ | |
734 | static struct kcm_psock *reserve_psock(struct kcm_sock *kcm) | |
735 | { | |
736 | struct kcm_mux *mux = kcm->mux; | |
737 | struct kcm_psock *psock; | |
738 | ||
739 | psock = kcm->tx_psock; | |
740 | ||
741 | smp_rmb(); /* Must read tx_psock before tx_wait */ | |
742 | ||
743 | if (psock) { | |
744 | WARN_ON(kcm->tx_wait); | |
745 | if (unlikely(psock->tx_stopped)) | |
746 | unreserve_psock(kcm); | |
747 | else | |
748 | return kcm->tx_psock; | |
749 | } | |
750 | ||
751 | spin_lock_bh(&mux->lock); | |
752 | ||
753 | /* Check again under lock to see if psock was reserved for this | |
754 | * psock via psock_unreserve. | |
755 | */ | |
756 | psock = kcm->tx_psock; | |
757 | if (unlikely(psock)) { | |
758 | WARN_ON(kcm->tx_wait); | |
759 | spin_unlock_bh(&mux->lock); | |
760 | return kcm->tx_psock; | |
761 | } | |
762 | ||
763 | if (!list_empty(&mux->psocks_avail)) { | |
764 | psock = list_first_entry(&mux->psocks_avail, | |
765 | struct kcm_psock, | |
766 | psock_avail_list); | |
767 | list_del(&psock->psock_avail_list); | |
768 | if (kcm->tx_wait) { | |
769 | list_del(&kcm->wait_psock_list); | |
770 | kcm->tx_wait = false; | |
771 | } | |
772 | kcm->tx_psock = psock; | |
773 | psock->tx_kcm = kcm; | |
cd6e111b | 774 | KCM_STATS_INCR(psock->stats.reserved); |
ab7ac4eb TH |
775 | } else if (!kcm->tx_wait) { |
776 | list_add_tail(&kcm->wait_psock_list, | |
777 | &mux->kcm_tx_waiters); | |
778 | kcm->tx_wait = true; | |
779 | } | |
780 | ||
781 | spin_unlock_bh(&mux->lock); | |
782 | ||
783 | return psock; | |
784 | } | |
785 | ||
786 | /* mux lock held */ | |
787 | static void psock_now_avail(struct kcm_psock *psock) | |
788 | { | |
789 | struct kcm_mux *mux = psock->mux; | |
790 | struct kcm_sock *kcm; | |
791 | ||
792 | if (list_empty(&mux->kcm_tx_waiters)) { | |
793 | list_add_tail(&psock->psock_avail_list, | |
794 | &mux->psocks_avail); | |
795 | } else { | |
796 | kcm = list_first_entry(&mux->kcm_tx_waiters, | |
797 | struct kcm_sock, | |
798 | wait_psock_list); | |
799 | list_del(&kcm->wait_psock_list); | |
800 | kcm->tx_wait = false; | |
801 | psock->tx_kcm = kcm; | |
802 | ||
803 | /* Commit before changing tx_psock since that is read in | |
804 | * reserve_psock before queuing work. | |
805 | */ | |
806 | smp_mb(); | |
807 | ||
808 | kcm->tx_psock = psock; | |
cd6e111b | 809 | KCM_STATS_INCR(psock->stats.reserved); |
ab7ac4eb TH |
810 | queue_work(kcm_wq, &kcm->tx_work); |
811 | } | |
812 | } | |
813 | ||
814 | /* kcm sock is locked. */ | |
815 | static void unreserve_psock(struct kcm_sock *kcm) | |
816 | { | |
817 | struct kcm_psock *psock; | |
818 | struct kcm_mux *mux = kcm->mux; | |
819 | ||
820 | spin_lock_bh(&mux->lock); | |
821 | ||
822 | psock = kcm->tx_psock; | |
823 | ||
824 | if (WARN_ON(!psock)) { | |
825 | spin_unlock_bh(&mux->lock); | |
826 | return; | |
827 | } | |
828 | ||
829 | smp_rmb(); /* Read tx_psock before tx_wait */ | |
830 | ||
cd6e111b TH |
831 | kcm_update_tx_mux_stats(mux, psock); |
832 | ||
ab7ac4eb TH |
833 | WARN_ON(kcm->tx_wait); |
834 | ||
835 | kcm->tx_psock = NULL; | |
836 | psock->tx_kcm = NULL; | |
cd6e111b | 837 | KCM_STATS_INCR(psock->stats.unreserved); |
ab7ac4eb TH |
838 | |
839 | if (unlikely(psock->tx_stopped)) { | |
840 | if (psock->done) { | |
841 | /* Deferred free */ | |
842 | list_del(&psock->psock_list); | |
843 | mux->psocks_cnt--; | |
844 | sock_put(psock->sk); | |
845 | fput(psock->sk->sk_socket->file); | |
846 | kmem_cache_free(kcm_psockp, psock); | |
847 | } | |
848 | ||
849 | /* Don't put back on available list */ | |
850 | ||
851 | spin_unlock_bh(&mux->lock); | |
852 | ||
853 | return; | |
854 | } | |
855 | ||
856 | psock_now_avail(psock); | |
857 | ||
858 | spin_unlock_bh(&mux->lock); | |
859 | } | |
860 | ||
cd6e111b TH |
861 | static void kcm_report_tx_retry(struct kcm_sock *kcm) |
862 | { | |
863 | struct kcm_mux *mux = kcm->mux; | |
864 | ||
865 | spin_lock_bh(&mux->lock); | |
866 | KCM_STATS_INCR(mux->stats.tx_retries); | |
867 | spin_unlock_bh(&mux->lock); | |
868 | } | |
869 | ||
ab7ac4eb TH |
870 | /* Write any messages ready on the kcm socket. Called with kcm sock lock |
871 | * held. Return bytes actually sent or error. | |
872 | */ | |
873 | static int kcm_write_msgs(struct kcm_sock *kcm) | |
874 | { | |
875 | struct sock *sk = &kcm->sk; | |
876 | struct kcm_psock *psock; | |
877 | struct sk_buff *skb, *head; | |
878 | struct kcm_tx_msg *txm; | |
879 | unsigned short fragidx, frag_offset; | |
880 | unsigned int sent, total_sent = 0; | |
881 | int ret = 0; | |
882 | ||
883 | kcm->tx_wait_more = false; | |
884 | psock = kcm->tx_psock; | |
885 | if (unlikely(psock && psock->tx_stopped)) { | |
886 | /* A reserved psock was aborted asynchronously. Unreserve | |
887 | * it and we'll retry the message. | |
888 | */ | |
889 | unreserve_psock(kcm); | |
cd6e111b | 890 | kcm_report_tx_retry(kcm); |
ab7ac4eb TH |
891 | if (skb_queue_empty(&sk->sk_write_queue)) |
892 | return 0; | |
893 | ||
894 | kcm_tx_msg(skb_peek(&sk->sk_write_queue))->sent = 0; | |
895 | ||
896 | } else if (skb_queue_empty(&sk->sk_write_queue)) { | |
897 | return 0; | |
898 | } | |
899 | ||
900 | head = skb_peek(&sk->sk_write_queue); | |
901 | txm = kcm_tx_msg(head); | |
902 | ||
903 | if (txm->sent) { | |
904 | /* Send of first skbuff in queue already in progress */ | |
905 | if (WARN_ON(!psock)) { | |
906 | ret = -EINVAL; | |
907 | goto out; | |
908 | } | |
909 | sent = txm->sent; | |
910 | frag_offset = txm->frag_offset; | |
911 | fragidx = txm->fragidx; | |
912 | skb = txm->frag_skb; | |
913 | ||
914 | goto do_frag; | |
915 | } | |
916 | ||
917 | try_again: | |
918 | psock = reserve_psock(kcm); | |
919 | if (!psock) | |
920 | goto out; | |
921 | ||
922 | do { | |
923 | skb = head; | |
924 | txm = kcm_tx_msg(head); | |
925 | sent = 0; | |
926 | ||
927 | do_frag_list: | |
928 | if (WARN_ON(!skb_shinfo(skb)->nr_frags)) { | |
929 | ret = -EINVAL; | |
930 | goto out; | |
931 | } | |
932 | ||
933 | for (fragidx = 0; fragidx < skb_shinfo(skb)->nr_frags; | |
934 | fragidx++) { | |
935 | skb_frag_t *frag; | |
936 | ||
937 | frag_offset = 0; | |
938 | do_frag: | |
939 | frag = &skb_shinfo(skb)->frags[fragidx]; | |
940 | if (WARN_ON(!frag->size)) { | |
941 | ret = -EINVAL; | |
942 | goto out; | |
943 | } | |
944 | ||
945 | ret = kernel_sendpage(psock->sk->sk_socket, | |
946 | frag->page.p, | |
947 | frag->page_offset + frag_offset, | |
948 | frag->size - frag_offset, | |
949 | MSG_DONTWAIT); | |
950 | if (ret <= 0) { | |
951 | if (ret == -EAGAIN) { | |
952 | /* Save state to try again when there's | |
953 | * write space on the socket | |
954 | */ | |
955 | txm->sent = sent; | |
956 | txm->frag_offset = frag_offset; | |
957 | txm->fragidx = fragidx; | |
958 | txm->frag_skb = skb; | |
959 | ||
960 | ret = 0; | |
961 | goto out; | |
962 | } | |
963 | ||
964 | /* Hard failure in sending message, abort this | |
965 | * psock since it has lost framing | |
966 | * synchonization and retry sending the | |
967 | * message from the beginning. | |
968 | */ | |
969 | kcm_abort_tx_psock(psock, ret ? -ret : EPIPE, | |
970 | true); | |
971 | unreserve_psock(kcm); | |
972 | ||
973 | txm->sent = 0; | |
cd6e111b | 974 | kcm_report_tx_retry(kcm); |
ab7ac4eb TH |
975 | ret = 0; |
976 | ||
977 | goto try_again; | |
978 | } | |
979 | ||
980 | sent += ret; | |
981 | frag_offset += ret; | |
cd6e111b | 982 | KCM_STATS_ADD(psock->stats.tx_bytes, ret); |
ab7ac4eb TH |
983 | if (frag_offset < frag->size) { |
984 | /* Not finished with this frag */ | |
985 | goto do_frag; | |
986 | } | |
987 | } | |
988 | ||
989 | if (skb == head) { | |
990 | if (skb_has_frag_list(skb)) { | |
991 | skb = skb_shinfo(skb)->frag_list; | |
992 | goto do_frag_list; | |
993 | } | |
994 | } else if (skb->next) { | |
995 | skb = skb->next; | |
996 | goto do_frag_list; | |
997 | } | |
998 | ||
999 | /* Successfully sent the whole packet, account for it. */ | |
1000 | skb_dequeue(&sk->sk_write_queue); | |
1001 | kfree_skb(head); | |
1002 | sk->sk_wmem_queued -= sent; | |
1003 | total_sent += sent; | |
cd6e111b | 1004 | KCM_STATS_INCR(psock->stats.tx_msgs); |
ab7ac4eb TH |
1005 | } while ((head = skb_peek(&sk->sk_write_queue))); |
1006 | out: | |
1007 | if (!head) { | |
1008 | /* Done with all queued messages. */ | |
1009 | WARN_ON(!skb_queue_empty(&sk->sk_write_queue)); | |
1010 | unreserve_psock(kcm); | |
1011 | } | |
1012 | ||
1013 | /* Check if write space is available */ | |
1014 | sk->sk_write_space(sk); | |
1015 | ||
1016 | return total_sent ? : ret; | |
1017 | } | |
1018 | ||
1019 | static void kcm_tx_work(struct work_struct *w) | |
1020 | { | |
1021 | struct kcm_sock *kcm = container_of(w, struct kcm_sock, tx_work); | |
1022 | struct sock *sk = &kcm->sk; | |
1023 | int err; | |
1024 | ||
1025 | lock_sock(sk); | |
1026 | ||
1027 | /* Primarily for SOCK_DGRAM sockets, also handle asynchronous tx | |
1028 | * aborts | |
1029 | */ | |
1030 | err = kcm_write_msgs(kcm); | |
1031 | if (err < 0) { | |
1032 | /* Hard failure in write, report error on KCM socket */ | |
1033 | pr_warn("KCM: Hard failure on kcm_write_msgs %d\n", err); | |
1034 | report_csk_error(&kcm->sk, -err); | |
1035 | goto out; | |
1036 | } | |
1037 | ||
1038 | /* Primarily for SOCK_SEQPACKET sockets */ | |
1039 | if (likely(sk->sk_socket) && | |
1040 | test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
1041 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1042 | sk->sk_write_space(sk); | |
1043 | } | |
1044 | ||
1045 | out: | |
1046 | release_sock(sk); | |
1047 | } | |
1048 | ||
1049 | static void kcm_push(struct kcm_sock *kcm) | |
1050 | { | |
1051 | if (kcm->tx_wait_more) | |
1052 | kcm_write_msgs(kcm); | |
1053 | } | |
1054 | ||
f29698fc TH |
1055 | static ssize_t kcm_sendpage(struct socket *sock, struct page *page, |
1056 | int offset, size_t size, int flags) | |
1057 | ||
1058 | { | |
1059 | struct sock *sk = sock->sk; | |
1060 | struct kcm_sock *kcm = kcm_sk(sk); | |
1061 | struct sk_buff *skb = NULL, *head = NULL; | |
1062 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
1063 | bool eor; | |
1064 | int err = 0; | |
1065 | int i; | |
1066 | ||
1067 | if (flags & MSG_SENDPAGE_NOTLAST) | |
1068 | flags |= MSG_MORE; | |
1069 | ||
1070 | /* No MSG_EOR from splice, only look at MSG_MORE */ | |
1071 | eor = !(flags & MSG_MORE); | |
1072 | ||
1073 | lock_sock(sk); | |
1074 | ||
1075 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
1076 | ||
1077 | err = -EPIPE; | |
1078 | if (sk->sk_err) | |
1079 | goto out_error; | |
1080 | ||
1081 | if (kcm->seq_skb) { | |
1082 | /* Previously opened message */ | |
1083 | head = kcm->seq_skb; | |
1084 | skb = kcm_tx_msg(head)->last_skb; | |
1085 | i = skb_shinfo(skb)->nr_frags; | |
1086 | ||
1087 | if (skb_can_coalesce(skb, i, page, offset)) { | |
1088 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], size); | |
1089 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; | |
1090 | goto coalesced; | |
1091 | } | |
1092 | ||
1093 | if (i >= MAX_SKB_FRAGS) { | |
1094 | struct sk_buff *tskb; | |
1095 | ||
1096 | tskb = alloc_skb(0, sk->sk_allocation); | |
1097 | while (!tskb) { | |
1098 | kcm_push(kcm); | |
1099 | err = sk_stream_wait_memory(sk, &timeo); | |
1100 | if (err) | |
1101 | goto out_error; | |
1102 | } | |
1103 | ||
1104 | if (head == skb) | |
1105 | skb_shinfo(head)->frag_list = tskb; | |
1106 | else | |
1107 | skb->next = tskb; | |
1108 | ||
1109 | skb = tskb; | |
1110 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1111 | i = 0; | |
1112 | } | |
1113 | } else { | |
1114 | /* Call the sk_stream functions to manage the sndbuf mem. */ | |
1115 | if (!sk_stream_memory_free(sk)) { | |
1116 | kcm_push(kcm); | |
1117 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1118 | err = sk_stream_wait_memory(sk, &timeo); | |
1119 | if (err) | |
1120 | goto out_error; | |
1121 | } | |
1122 | ||
1123 | head = alloc_skb(0, sk->sk_allocation); | |
1124 | while (!head) { | |
1125 | kcm_push(kcm); | |
1126 | err = sk_stream_wait_memory(sk, &timeo); | |
1127 | if (err) | |
1128 | goto out_error; | |
1129 | } | |
1130 | ||
1131 | skb = head; | |
1132 | i = 0; | |
1133 | } | |
1134 | ||
1135 | get_page(page); | |
1136 | skb_fill_page_desc(skb, i, page, offset, size); | |
1137 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; | |
1138 | ||
1139 | coalesced: | |
1140 | skb->len += size; | |
1141 | skb->data_len += size; | |
1142 | skb->truesize += size; | |
1143 | sk->sk_wmem_queued += size; | |
1144 | sk_mem_charge(sk, size); | |
1145 | ||
1146 | if (head != skb) { | |
1147 | head->len += size; | |
1148 | head->data_len += size; | |
1149 | head->truesize += size; | |
1150 | } | |
1151 | ||
1152 | if (eor) { | |
1153 | bool not_busy = skb_queue_empty(&sk->sk_write_queue); | |
1154 | ||
1155 | /* Message complete, queue it on send buffer */ | |
1156 | __skb_queue_tail(&sk->sk_write_queue, head); | |
1157 | kcm->seq_skb = NULL; | |
1158 | KCM_STATS_INCR(kcm->stats.tx_msgs); | |
1159 | ||
1160 | if (flags & MSG_BATCH) { | |
1161 | kcm->tx_wait_more = true; | |
1162 | } else if (kcm->tx_wait_more || not_busy) { | |
1163 | err = kcm_write_msgs(kcm); | |
1164 | if (err < 0) { | |
1165 | /* We got a hard error in write_msgs but have | |
1166 | * already queued this message. Report an error | |
1167 | * in the socket, but don't affect return value | |
1168 | * from sendmsg | |
1169 | */ | |
1170 | pr_warn("KCM: Hard failure on kcm_write_msgs\n"); | |
1171 | report_csk_error(&kcm->sk, -err); | |
1172 | } | |
1173 | } | |
1174 | } else { | |
1175 | /* Message not complete, save state */ | |
1176 | kcm->seq_skb = head; | |
1177 | kcm_tx_msg(head)->last_skb = skb; | |
1178 | } | |
1179 | ||
1180 | KCM_STATS_ADD(kcm->stats.tx_bytes, size); | |
1181 | ||
1182 | release_sock(sk); | |
1183 | return size; | |
1184 | ||
1185 | out_error: | |
1186 | kcm_push(kcm); | |
1187 | ||
1188 | err = sk_stream_error(sk, flags, err); | |
1189 | ||
1190 | /* make sure we wake any epoll edge trigger waiter */ | |
1191 | if (unlikely(skb_queue_len(&sk->sk_write_queue) == 0 && err == -EAGAIN)) | |
1192 | sk->sk_write_space(sk); | |
1193 | ||
1194 | release_sock(sk); | |
1195 | return err; | |
1196 | } | |
1197 | ||
ab7ac4eb TH |
1198 | static int kcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1199 | { | |
1200 | struct sock *sk = sock->sk; | |
1201 | struct kcm_sock *kcm = kcm_sk(sk); | |
1202 | struct sk_buff *skb = NULL, *head = NULL; | |
1203 | size_t copy, copied = 0; | |
1204 | long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1205 | int eor = (sock->type == SOCK_DGRAM) ? | |
1206 | !(msg->msg_flags & MSG_MORE) : !!(msg->msg_flags & MSG_EOR); | |
1207 | int err = -EPIPE; | |
1208 | ||
1209 | lock_sock(sk); | |
1210 | ||
1211 | /* Per tcp_sendmsg this should be in poll */ | |
1212 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
1213 | ||
1214 | if (sk->sk_err) | |
1215 | goto out_error; | |
1216 | ||
1217 | if (kcm->seq_skb) { | |
1218 | /* Previously opened message */ | |
1219 | head = kcm->seq_skb; | |
1220 | skb = kcm_tx_msg(head)->last_skb; | |
1221 | goto start; | |
1222 | } | |
1223 | ||
1224 | /* Call the sk_stream functions to manage the sndbuf mem. */ | |
1225 | if (!sk_stream_memory_free(sk)) { | |
1226 | kcm_push(kcm); | |
1227 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1228 | err = sk_stream_wait_memory(sk, &timeo); | |
1229 | if (err) | |
1230 | goto out_error; | |
1231 | } | |
1232 | ||
1233 | /* New message, alloc head skb */ | |
1234 | head = alloc_skb(0, sk->sk_allocation); | |
1235 | while (!head) { | |
1236 | kcm_push(kcm); | |
1237 | err = sk_stream_wait_memory(sk, &timeo); | |
1238 | if (err) | |
1239 | goto out_error; | |
1240 | ||
1241 | head = alloc_skb(0, sk->sk_allocation); | |
1242 | } | |
1243 | ||
1244 | skb = head; | |
1245 | ||
1246 | /* Set ip_summed to CHECKSUM_UNNECESSARY to avoid calling | |
1247 | * csum_and_copy_from_iter from skb_do_copy_data_nocache. | |
1248 | */ | |
1249 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1250 | ||
1251 | start: | |
1252 | while (msg_data_left(msg)) { | |
1253 | bool merge = true; | |
1254 | int i = skb_shinfo(skb)->nr_frags; | |
1255 | struct page_frag *pfrag = sk_page_frag(sk); | |
1256 | ||
1257 | if (!sk_page_frag_refill(sk, pfrag)) | |
1258 | goto wait_for_memory; | |
1259 | ||
1260 | if (!skb_can_coalesce(skb, i, pfrag->page, | |
1261 | pfrag->offset)) { | |
1262 | if (i == MAX_SKB_FRAGS) { | |
1263 | struct sk_buff *tskb; | |
1264 | ||
1265 | tskb = alloc_skb(0, sk->sk_allocation); | |
1266 | if (!tskb) | |
1267 | goto wait_for_memory; | |
1268 | ||
1269 | if (head == skb) | |
1270 | skb_shinfo(head)->frag_list = tskb; | |
1271 | else | |
1272 | skb->next = tskb; | |
1273 | ||
1274 | skb = tskb; | |
1275 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1276 | continue; | |
1277 | } | |
1278 | merge = false; | |
1279 | } | |
1280 | ||
1281 | copy = min_t(int, msg_data_left(msg), | |
1282 | pfrag->size - pfrag->offset); | |
1283 | ||
1284 | if (!sk_wmem_schedule(sk, copy)) | |
1285 | goto wait_for_memory; | |
1286 | ||
1287 | err = skb_copy_to_page_nocache(sk, &msg->msg_iter, skb, | |
1288 | pfrag->page, | |
1289 | pfrag->offset, | |
1290 | copy); | |
1291 | if (err) | |
1292 | goto out_error; | |
1293 | ||
1294 | /* Update the skb. */ | |
1295 | if (merge) { | |
1296 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
1297 | } else { | |
1298 | skb_fill_page_desc(skb, i, pfrag->page, | |
1299 | pfrag->offset, copy); | |
1300 | get_page(pfrag->page); | |
1301 | } | |
1302 | ||
1303 | pfrag->offset += copy; | |
1304 | copied += copy; | |
1305 | if (head != skb) { | |
1306 | head->len += copy; | |
1307 | head->data_len += copy; | |
1308 | } | |
1309 | ||
1310 | continue; | |
1311 | ||
1312 | wait_for_memory: | |
1313 | kcm_push(kcm); | |
1314 | err = sk_stream_wait_memory(sk, &timeo); | |
1315 | if (err) | |
1316 | goto out_error; | |
1317 | } | |
1318 | ||
1319 | if (eor) { | |
1320 | bool not_busy = skb_queue_empty(&sk->sk_write_queue); | |
1321 | ||
1322 | /* Message complete, queue it on send buffer */ | |
1323 | __skb_queue_tail(&sk->sk_write_queue, head); | |
1324 | kcm->seq_skb = NULL; | |
cd6e111b | 1325 | KCM_STATS_INCR(kcm->stats.tx_msgs); |
ab7ac4eb TH |
1326 | |
1327 | if (msg->msg_flags & MSG_BATCH) { | |
1328 | kcm->tx_wait_more = true; | |
1329 | } else if (kcm->tx_wait_more || not_busy) { | |
1330 | err = kcm_write_msgs(kcm); | |
1331 | if (err < 0) { | |
1332 | /* We got a hard error in write_msgs but have | |
1333 | * already queued this message. Report an error | |
1334 | * in the socket, but don't affect return value | |
1335 | * from sendmsg | |
1336 | */ | |
1337 | pr_warn("KCM: Hard failure on kcm_write_msgs\n"); | |
1338 | report_csk_error(&kcm->sk, -err); | |
1339 | } | |
1340 | } | |
1341 | } else { | |
1342 | /* Message not complete, save state */ | |
1343 | partial_message: | |
1344 | kcm->seq_skb = head; | |
1345 | kcm_tx_msg(head)->last_skb = skb; | |
1346 | } | |
1347 | ||
cd6e111b TH |
1348 | KCM_STATS_ADD(kcm->stats.tx_bytes, copied); |
1349 | ||
ab7ac4eb TH |
1350 | release_sock(sk); |
1351 | return copied; | |
1352 | ||
1353 | out_error: | |
1354 | kcm_push(kcm); | |
1355 | ||
1356 | if (copied && sock->type == SOCK_SEQPACKET) { | |
1357 | /* Wrote some bytes before encountering an | |
1358 | * error, return partial success. | |
1359 | */ | |
1360 | goto partial_message; | |
1361 | } | |
1362 | ||
1363 | if (head != kcm->seq_skb) | |
1364 | kfree_skb(head); | |
1365 | ||
1366 | err = sk_stream_error(sk, msg->msg_flags, err); | |
1367 | ||
1368 | /* make sure we wake any epoll edge trigger waiter */ | |
1369 | if (unlikely(skb_queue_len(&sk->sk_write_queue) == 0 && err == -EAGAIN)) | |
1370 | sk->sk_write_space(sk); | |
1371 | ||
1372 | release_sock(sk); | |
1373 | return err; | |
1374 | } | |
1375 | ||
1376 | static struct sk_buff *kcm_wait_data(struct sock *sk, int flags, | |
1377 | long timeo, int *err) | |
1378 | { | |
1379 | struct sk_buff *skb; | |
1380 | ||
1381 | while (!(skb = skb_peek(&sk->sk_receive_queue))) { | |
1382 | if (sk->sk_err) { | |
1383 | *err = sock_error(sk); | |
1384 | return NULL; | |
1385 | } | |
1386 | ||
1387 | if (sock_flag(sk, SOCK_DONE)) | |
1388 | return NULL; | |
1389 | ||
1390 | if ((flags & MSG_DONTWAIT) || !timeo) { | |
1391 | *err = -EAGAIN; | |
1392 | return NULL; | |
1393 | } | |
1394 | ||
1395 | sk_wait_data(sk, &timeo, NULL); | |
1396 | ||
1397 | /* Handle signals */ | |
1398 | if (signal_pending(current)) { | |
1399 | *err = sock_intr_errno(timeo); | |
1400 | return NULL; | |
1401 | } | |
1402 | } | |
1403 | ||
1404 | return skb; | |
1405 | } | |
1406 | ||
1407 | static int kcm_recvmsg(struct socket *sock, struct msghdr *msg, | |
1408 | size_t len, int flags) | |
1409 | { | |
1410 | struct sock *sk = sock->sk; | |
cd6e111b | 1411 | struct kcm_sock *kcm = kcm_sk(sk); |
ab7ac4eb TH |
1412 | int err = 0; |
1413 | long timeo; | |
1414 | struct kcm_rx_msg *rxm; | |
1415 | int copied = 0; | |
1416 | struct sk_buff *skb; | |
1417 | ||
1418 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1419 | ||
1420 | lock_sock(sk); | |
1421 | ||
1422 | skb = kcm_wait_data(sk, flags, timeo, &err); | |
1423 | if (!skb) | |
1424 | goto out; | |
1425 | ||
1426 | /* Okay, have a message on the receive queue */ | |
1427 | ||
1428 | rxm = kcm_rx_msg(skb); | |
1429 | ||
1430 | if (len > rxm->full_len) | |
1431 | len = rxm->full_len; | |
1432 | ||
1433 | err = skb_copy_datagram_msg(skb, rxm->offset, msg, len); | |
1434 | if (err < 0) | |
1435 | goto out; | |
1436 | ||
1437 | copied = len; | |
1438 | if (likely(!(flags & MSG_PEEK))) { | |
cd6e111b | 1439 | KCM_STATS_ADD(kcm->stats.rx_bytes, copied); |
ab7ac4eb TH |
1440 | if (copied < rxm->full_len) { |
1441 | if (sock->type == SOCK_DGRAM) { | |
1442 | /* Truncated message */ | |
1443 | msg->msg_flags |= MSG_TRUNC; | |
1444 | goto msg_finished; | |
1445 | } | |
1446 | rxm->offset += copied; | |
1447 | rxm->full_len -= copied; | |
1448 | } else { | |
1449 | msg_finished: | |
1450 | /* Finished with message */ | |
1451 | msg->msg_flags |= MSG_EOR; | |
cd6e111b | 1452 | KCM_STATS_INCR(kcm->stats.rx_msgs); |
ab7ac4eb TH |
1453 | skb_unlink(skb, &sk->sk_receive_queue); |
1454 | kfree_skb(skb); | |
1455 | } | |
1456 | } | |
1457 | ||
1458 | out: | |
1459 | release_sock(sk); | |
1460 | ||
1461 | return copied ? : err; | |
1462 | } | |
1463 | ||
91687355 TH |
1464 | static ssize_t kcm_sock_splice(struct sock *sk, |
1465 | struct pipe_inode_info *pipe, | |
1466 | struct splice_pipe_desc *spd) | |
1467 | { | |
1468 | int ret; | |
1469 | ||
1470 | release_sock(sk); | |
1471 | ret = splice_to_pipe(pipe, spd); | |
1472 | lock_sock(sk); | |
1473 | ||
1474 | return ret; | |
1475 | } | |
1476 | ||
1477 | static ssize_t kcm_splice_read(struct socket *sock, loff_t *ppos, | |
1478 | struct pipe_inode_info *pipe, size_t len, | |
1479 | unsigned int flags) | |
1480 | { | |
1481 | struct sock *sk = sock->sk; | |
1482 | struct kcm_sock *kcm = kcm_sk(sk); | |
1483 | long timeo; | |
1484 | struct kcm_rx_msg *rxm; | |
1485 | int err = 0; | |
1486 | size_t copied; | |
1487 | struct sk_buff *skb; | |
1488 | ||
1489 | /* Only support splice for SOCKSEQPACKET */ | |
1490 | ||
1491 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1492 | ||
1493 | lock_sock(sk); | |
1494 | ||
1495 | skb = kcm_wait_data(sk, flags, timeo, &err); | |
1496 | if (!skb) | |
1497 | goto err_out; | |
1498 | ||
1499 | /* Okay, have a message on the receive queue */ | |
1500 | ||
1501 | rxm = kcm_rx_msg(skb); | |
1502 | ||
1503 | if (len > rxm->full_len) | |
1504 | len = rxm->full_len; | |
1505 | ||
1506 | copied = skb_splice_bits(skb, sk, rxm->offset, pipe, len, flags, | |
1507 | kcm_sock_splice); | |
1508 | if (copied < 0) { | |
1509 | err = copied; | |
1510 | goto err_out; | |
1511 | } | |
1512 | ||
1513 | KCM_STATS_ADD(kcm->stats.rx_bytes, copied); | |
1514 | ||
1515 | rxm->offset += copied; | |
1516 | rxm->full_len -= copied; | |
1517 | ||
1518 | /* We have no way to return MSG_EOR. If all the bytes have been | |
1519 | * read we still leave the message in the receive socket buffer. | |
1520 | * A subsequent recvmsg needs to be done to return MSG_EOR and | |
1521 | * finish reading the message. | |
1522 | */ | |
1523 | ||
1524 | release_sock(sk); | |
1525 | ||
1526 | return copied; | |
1527 | ||
1528 | err_out: | |
1529 | release_sock(sk); | |
1530 | ||
1531 | return err; | |
1532 | } | |
1533 | ||
ab7ac4eb TH |
1534 | /* kcm sock lock held */ |
1535 | static void kcm_recv_disable(struct kcm_sock *kcm) | |
1536 | { | |
1537 | struct kcm_mux *mux = kcm->mux; | |
1538 | ||
1539 | if (kcm->rx_disabled) | |
1540 | return; | |
1541 | ||
1542 | spin_lock_bh(&mux->rx_lock); | |
1543 | ||
1544 | kcm->rx_disabled = 1; | |
1545 | ||
1546 | /* If a psock is reserved we'll do cleanup in unreserve */ | |
1547 | if (!kcm->rx_psock) { | |
1548 | if (kcm->rx_wait) { | |
1549 | list_del(&kcm->wait_rx_list); | |
1550 | kcm->rx_wait = false; | |
1551 | } | |
1552 | ||
1553 | requeue_rx_msgs(mux, &kcm->sk.sk_receive_queue); | |
1554 | } | |
1555 | ||
1556 | spin_unlock_bh(&mux->rx_lock); | |
1557 | } | |
1558 | ||
1559 | /* kcm sock lock held */ | |
1560 | static void kcm_recv_enable(struct kcm_sock *kcm) | |
1561 | { | |
1562 | struct kcm_mux *mux = kcm->mux; | |
1563 | ||
1564 | if (!kcm->rx_disabled) | |
1565 | return; | |
1566 | ||
1567 | spin_lock_bh(&mux->rx_lock); | |
1568 | ||
1569 | kcm->rx_disabled = 0; | |
1570 | kcm_rcv_ready(kcm); | |
1571 | ||
1572 | spin_unlock_bh(&mux->rx_lock); | |
1573 | } | |
1574 | ||
1575 | static int kcm_setsockopt(struct socket *sock, int level, int optname, | |
1576 | char __user *optval, unsigned int optlen) | |
1577 | { | |
1578 | struct kcm_sock *kcm = kcm_sk(sock->sk); | |
1579 | int val, valbool; | |
1580 | int err = 0; | |
1581 | ||
1582 | if (level != SOL_KCM) | |
1583 | return -ENOPROTOOPT; | |
1584 | ||
1585 | if (optlen < sizeof(int)) | |
1586 | return -EINVAL; | |
1587 | ||
1588 | if (get_user(val, (int __user *)optval)) | |
1589 | return -EINVAL; | |
1590 | ||
1591 | valbool = val ? 1 : 0; | |
1592 | ||
1593 | switch (optname) { | |
1594 | case KCM_RECV_DISABLE: | |
1595 | lock_sock(&kcm->sk); | |
1596 | if (valbool) | |
1597 | kcm_recv_disable(kcm); | |
1598 | else | |
1599 | kcm_recv_enable(kcm); | |
1600 | release_sock(&kcm->sk); | |
1601 | break; | |
1602 | default: | |
1603 | err = -ENOPROTOOPT; | |
1604 | } | |
1605 | ||
1606 | return err; | |
1607 | } | |
1608 | ||
1609 | static int kcm_getsockopt(struct socket *sock, int level, int optname, | |
1610 | char __user *optval, int __user *optlen) | |
1611 | { | |
1612 | struct kcm_sock *kcm = kcm_sk(sock->sk); | |
1613 | int val, len; | |
1614 | ||
1615 | if (level != SOL_KCM) | |
1616 | return -ENOPROTOOPT; | |
1617 | ||
1618 | if (get_user(len, optlen)) | |
1619 | return -EFAULT; | |
1620 | ||
1621 | len = min_t(unsigned int, len, sizeof(int)); | |
1622 | if (len < 0) | |
1623 | return -EINVAL; | |
1624 | ||
1625 | switch (optname) { | |
1626 | case KCM_RECV_DISABLE: | |
1627 | val = kcm->rx_disabled; | |
1628 | break; | |
1629 | default: | |
1630 | return -ENOPROTOOPT; | |
1631 | } | |
1632 | ||
1633 | if (put_user(len, optlen)) | |
1634 | return -EFAULT; | |
1635 | if (copy_to_user(optval, &val, len)) | |
1636 | return -EFAULT; | |
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | static void init_kcm_sock(struct kcm_sock *kcm, struct kcm_mux *mux) | |
1641 | { | |
1642 | struct kcm_sock *tkcm; | |
1643 | struct list_head *head; | |
1644 | int index = 0; | |
1645 | ||
1646 | /* For SOCK_SEQPACKET sock type, datagram_poll checks the sk_state, so | |
1647 | * we set sk_state, otherwise epoll_wait always returns right away with | |
1648 | * POLLHUP | |
1649 | */ | |
1650 | kcm->sk.sk_state = TCP_ESTABLISHED; | |
1651 | ||
1652 | /* Add to mux's kcm sockets list */ | |
1653 | kcm->mux = mux; | |
1654 | spin_lock_bh(&mux->lock); | |
1655 | ||
1656 | head = &mux->kcm_socks; | |
1657 | list_for_each_entry(tkcm, &mux->kcm_socks, kcm_sock_list) { | |
1658 | if (tkcm->index != index) | |
1659 | break; | |
1660 | head = &tkcm->kcm_sock_list; | |
1661 | index++; | |
1662 | } | |
1663 | ||
1664 | list_add(&kcm->kcm_sock_list, head); | |
1665 | kcm->index = index; | |
1666 | ||
1667 | mux->kcm_socks_cnt++; | |
1668 | spin_unlock_bh(&mux->lock); | |
1669 | ||
1670 | INIT_WORK(&kcm->tx_work, kcm_tx_work); | |
1671 | ||
1672 | spin_lock_bh(&mux->rx_lock); | |
1673 | kcm_rcv_ready(kcm); | |
1674 | spin_unlock_bh(&mux->rx_lock); | |
1675 | } | |
1676 | ||
29152a34 TH |
1677 | static void kcm_rx_msg_timeout(unsigned long arg) |
1678 | { | |
1679 | struct kcm_psock *psock = (struct kcm_psock *)arg; | |
1680 | ||
1681 | /* Message assembly timed out */ | |
1682 | KCM_STATS_INCR(psock->stats.rx_msg_timeouts); | |
1683 | kcm_abort_rx_psock(psock, ETIMEDOUT, NULL); | |
1684 | } | |
1685 | ||
ab7ac4eb TH |
1686 | static int kcm_attach(struct socket *sock, struct socket *csock, |
1687 | struct bpf_prog *prog) | |
1688 | { | |
1689 | struct kcm_sock *kcm = kcm_sk(sock->sk); | |
1690 | struct kcm_mux *mux = kcm->mux; | |
1691 | struct sock *csk; | |
1692 | struct kcm_psock *psock = NULL, *tpsock; | |
1693 | struct list_head *head; | |
1694 | int index = 0; | |
1695 | ||
1696 | if (csock->ops->family != PF_INET && | |
1697 | csock->ops->family != PF_INET6) | |
1698 | return -EINVAL; | |
1699 | ||
1700 | csk = csock->sk; | |
1701 | if (!csk) | |
1702 | return -EINVAL; | |
1703 | ||
1704 | /* Only support TCP for now */ | |
1705 | if (csk->sk_protocol != IPPROTO_TCP) | |
1706 | return -EINVAL; | |
1707 | ||
1708 | psock = kmem_cache_zalloc(kcm_psockp, GFP_KERNEL); | |
1709 | if (!psock) | |
1710 | return -ENOMEM; | |
1711 | ||
1712 | psock->mux = mux; | |
1713 | psock->sk = csk; | |
1714 | psock->bpf_prog = prog; | |
29152a34 TH |
1715 | |
1716 | setup_timer(&psock->rx_msg_timer, kcm_rx_msg_timeout, | |
1717 | (unsigned long)psock); | |
1718 | ||
ab7ac4eb TH |
1719 | INIT_WORK(&psock->rx_work, psock_rx_work); |
1720 | INIT_DELAYED_WORK(&psock->rx_delayed_work, psock_rx_delayed_work); | |
1721 | ||
1722 | sock_hold(csk); | |
1723 | ||
1724 | write_lock_bh(&csk->sk_callback_lock); | |
1725 | psock->save_data_ready = csk->sk_data_ready; | |
1726 | psock->save_write_space = csk->sk_write_space; | |
1727 | psock->save_state_change = csk->sk_state_change; | |
1728 | csk->sk_user_data = psock; | |
1729 | csk->sk_data_ready = psock_tcp_data_ready; | |
1730 | csk->sk_write_space = psock_tcp_write_space; | |
1731 | csk->sk_state_change = psock_tcp_state_change; | |
1732 | write_unlock_bh(&csk->sk_callback_lock); | |
1733 | ||
1734 | /* Finished initialization, now add the psock to the MUX. */ | |
1735 | spin_lock_bh(&mux->lock); | |
1736 | head = &mux->psocks; | |
1737 | list_for_each_entry(tpsock, &mux->psocks, psock_list) { | |
1738 | if (tpsock->index != index) | |
1739 | break; | |
1740 | head = &tpsock->psock_list; | |
1741 | index++; | |
1742 | } | |
1743 | ||
1744 | list_add(&psock->psock_list, head); | |
1745 | psock->index = index; | |
1746 | ||
cd6e111b | 1747 | KCM_STATS_INCR(mux->stats.psock_attach); |
ab7ac4eb TH |
1748 | mux->psocks_cnt++; |
1749 | psock_now_avail(psock); | |
1750 | spin_unlock_bh(&mux->lock); | |
1751 | ||
1752 | /* Schedule RX work in case there are already bytes queued */ | |
1753 | queue_work(kcm_wq, &psock->rx_work); | |
1754 | ||
1755 | return 0; | |
1756 | } | |
1757 | ||
1758 | static int kcm_attach_ioctl(struct socket *sock, struct kcm_attach *info) | |
1759 | { | |
1760 | struct socket *csock; | |
1761 | struct bpf_prog *prog; | |
1762 | int err; | |
1763 | ||
1764 | csock = sockfd_lookup(info->fd, &err); | |
1765 | if (!csock) | |
1766 | return -ENOENT; | |
1767 | ||
1768 | prog = bpf_prog_get(info->bpf_fd); | |
1769 | if (IS_ERR(prog)) { | |
1770 | err = PTR_ERR(prog); | |
1771 | goto out; | |
1772 | } | |
1773 | ||
1774 | if (prog->type != BPF_PROG_TYPE_SOCKET_FILTER) { | |
1775 | bpf_prog_put(prog); | |
1776 | err = -EINVAL; | |
1777 | goto out; | |
1778 | } | |
1779 | ||
1780 | err = kcm_attach(sock, csock, prog); | |
1781 | if (err) { | |
1782 | bpf_prog_put(prog); | |
1783 | goto out; | |
1784 | } | |
1785 | ||
1786 | /* Keep reference on file also */ | |
1787 | ||
1788 | return 0; | |
1789 | out: | |
1790 | fput(csock->file); | |
1791 | return err; | |
1792 | } | |
1793 | ||
1794 | static void kcm_unattach(struct kcm_psock *psock) | |
1795 | { | |
1796 | struct sock *csk = psock->sk; | |
1797 | struct kcm_mux *mux = psock->mux; | |
1798 | ||
1799 | /* Stop getting callbacks from TCP socket. After this there should | |
1800 | * be no way to reserve a kcm for this psock. | |
1801 | */ | |
1802 | write_lock_bh(&csk->sk_callback_lock); | |
1803 | csk->sk_user_data = NULL; | |
1804 | csk->sk_data_ready = psock->save_data_ready; | |
1805 | csk->sk_write_space = psock->save_write_space; | |
1806 | csk->sk_state_change = psock->save_state_change; | |
1807 | psock->rx_stopped = 1; | |
1808 | ||
1809 | if (WARN_ON(psock->rx_kcm)) { | |
1810 | write_unlock_bh(&csk->sk_callback_lock); | |
1811 | return; | |
1812 | } | |
1813 | ||
1814 | spin_lock_bh(&mux->rx_lock); | |
1815 | ||
1816 | /* Stop receiver activities. After this point psock should not be | |
1817 | * able to get onto ready list either through callbacks or work. | |
1818 | */ | |
1819 | if (psock->ready_rx_msg) { | |
1820 | list_del(&psock->psock_ready_list); | |
1821 | kfree_skb(psock->ready_rx_msg); | |
1822 | psock->ready_rx_msg = NULL; | |
cd6e111b | 1823 | KCM_STATS_INCR(mux->stats.rx_ready_drops); |
ab7ac4eb TH |
1824 | } |
1825 | ||
1826 | spin_unlock_bh(&mux->rx_lock); | |
1827 | ||
1828 | write_unlock_bh(&csk->sk_callback_lock); | |
1829 | ||
29152a34 | 1830 | del_timer_sync(&psock->rx_msg_timer); |
ab7ac4eb TH |
1831 | cancel_work_sync(&psock->rx_work); |
1832 | cancel_delayed_work_sync(&psock->rx_delayed_work); | |
1833 | ||
1834 | bpf_prog_put(psock->bpf_prog); | |
1835 | ||
1836 | kfree_skb(psock->rx_skb_head); | |
1837 | psock->rx_skb_head = NULL; | |
1838 | ||
1839 | spin_lock_bh(&mux->lock); | |
1840 | ||
cd6e111b TH |
1841 | aggregate_psock_stats(&psock->stats, &mux->aggregate_psock_stats); |
1842 | ||
1843 | KCM_STATS_INCR(mux->stats.psock_unattach); | |
1844 | ||
ab7ac4eb TH |
1845 | if (psock->tx_kcm) { |
1846 | /* psock was reserved. Just mark it finished and we will clean | |
1847 | * up in the kcm paths, we need kcm lock which can not be | |
1848 | * acquired here. | |
1849 | */ | |
cd6e111b | 1850 | KCM_STATS_INCR(mux->stats.psock_unattach_rsvd); |
ab7ac4eb TH |
1851 | spin_unlock_bh(&mux->lock); |
1852 | ||
1853 | /* We are unattaching a socket that is reserved. Abort the | |
1854 | * socket since we may be out of sync in sending on it. We need | |
1855 | * to do this without the mux lock. | |
1856 | */ | |
1857 | kcm_abort_tx_psock(psock, EPIPE, false); | |
1858 | ||
1859 | spin_lock_bh(&mux->lock); | |
1860 | if (!psock->tx_kcm) { | |
1861 | /* psock now unreserved in window mux was unlocked */ | |
1862 | goto no_reserved; | |
1863 | } | |
1864 | psock->done = 1; | |
1865 | ||
1866 | /* Commit done before queuing work to process it */ | |
1867 | smp_mb(); | |
1868 | ||
1869 | /* Queue tx work to make sure psock->done is handled */ | |
1870 | queue_work(kcm_wq, &psock->tx_kcm->tx_work); | |
1871 | spin_unlock_bh(&mux->lock); | |
1872 | } else { | |
1873 | no_reserved: | |
1874 | if (!psock->tx_stopped) | |
1875 | list_del(&psock->psock_avail_list); | |
1876 | list_del(&psock->psock_list); | |
1877 | mux->psocks_cnt--; | |
1878 | spin_unlock_bh(&mux->lock); | |
1879 | ||
1880 | sock_put(csk); | |
1881 | fput(csk->sk_socket->file); | |
1882 | kmem_cache_free(kcm_psockp, psock); | |
1883 | } | |
1884 | } | |
1885 | ||
1886 | static int kcm_unattach_ioctl(struct socket *sock, struct kcm_unattach *info) | |
1887 | { | |
1888 | struct kcm_sock *kcm = kcm_sk(sock->sk); | |
1889 | struct kcm_mux *mux = kcm->mux; | |
1890 | struct kcm_psock *psock; | |
1891 | struct socket *csock; | |
1892 | struct sock *csk; | |
1893 | int err; | |
1894 | ||
1895 | csock = sockfd_lookup(info->fd, &err); | |
1896 | if (!csock) | |
1897 | return -ENOENT; | |
1898 | ||
1899 | csk = csock->sk; | |
1900 | if (!csk) { | |
1901 | err = -EINVAL; | |
1902 | goto out; | |
1903 | } | |
1904 | ||
1905 | err = -ENOENT; | |
1906 | ||
1907 | spin_lock_bh(&mux->lock); | |
1908 | ||
1909 | list_for_each_entry(psock, &mux->psocks, psock_list) { | |
1910 | if (psock->sk != csk) | |
1911 | continue; | |
1912 | ||
1913 | /* Found the matching psock */ | |
1914 | ||
1915 | if (psock->unattaching || WARN_ON(psock->done)) { | |
1916 | err = -EALREADY; | |
1917 | break; | |
1918 | } | |
1919 | ||
1920 | psock->unattaching = 1; | |
1921 | ||
1922 | spin_unlock_bh(&mux->lock); | |
1923 | ||
1924 | kcm_unattach(psock); | |
1925 | ||
1926 | err = 0; | |
1927 | goto out; | |
1928 | } | |
1929 | ||
1930 | spin_unlock_bh(&mux->lock); | |
1931 | ||
1932 | out: | |
1933 | fput(csock->file); | |
1934 | return err; | |
1935 | } | |
1936 | ||
1937 | static struct proto kcm_proto = { | |
1938 | .name = "KCM", | |
1939 | .owner = THIS_MODULE, | |
1940 | .obj_size = sizeof(struct kcm_sock), | |
1941 | }; | |
1942 | ||
1943 | /* Clone a kcm socket. */ | |
1944 | static int kcm_clone(struct socket *osock, struct kcm_clone *info, | |
1945 | struct socket **newsockp) | |
1946 | { | |
1947 | struct socket *newsock; | |
1948 | struct sock *newsk; | |
1949 | struct file *newfile; | |
1950 | int err, newfd; | |
1951 | ||
1952 | err = -ENFILE; | |
1953 | newsock = sock_alloc(); | |
1954 | if (!newsock) | |
1955 | goto out; | |
1956 | ||
1957 | newsock->type = osock->type; | |
1958 | newsock->ops = osock->ops; | |
1959 | ||
1960 | __module_get(newsock->ops->owner); | |
1961 | ||
1962 | newfd = get_unused_fd_flags(0); | |
1963 | if (unlikely(newfd < 0)) { | |
1964 | err = newfd; | |
1965 | goto out_fd_fail; | |
1966 | } | |
1967 | ||
1968 | newfile = sock_alloc_file(newsock, 0, osock->sk->sk_prot_creator->name); | |
1969 | if (unlikely(IS_ERR(newfile))) { | |
1970 | err = PTR_ERR(newfile); | |
1971 | goto out_sock_alloc_fail; | |
1972 | } | |
1973 | ||
1974 | newsk = sk_alloc(sock_net(osock->sk), PF_KCM, GFP_KERNEL, | |
1975 | &kcm_proto, true); | |
1976 | if (!newsk) { | |
1977 | err = -ENOMEM; | |
1978 | goto out_sk_alloc_fail; | |
1979 | } | |
1980 | ||
1981 | sock_init_data(newsock, newsk); | |
1982 | init_kcm_sock(kcm_sk(newsk), kcm_sk(osock->sk)->mux); | |
1983 | ||
1984 | fd_install(newfd, newfile); | |
1985 | *newsockp = newsock; | |
1986 | info->fd = newfd; | |
1987 | ||
1988 | return 0; | |
1989 | ||
1990 | out_sk_alloc_fail: | |
1991 | fput(newfile); | |
1992 | out_sock_alloc_fail: | |
1993 | put_unused_fd(newfd); | |
1994 | out_fd_fail: | |
1995 | sock_release(newsock); | |
1996 | out: | |
1997 | return err; | |
1998 | } | |
1999 | ||
2000 | static int kcm_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
2001 | { | |
2002 | int err; | |
2003 | ||
2004 | switch (cmd) { | |
2005 | case SIOCKCMATTACH: { | |
2006 | struct kcm_attach info; | |
2007 | ||
2008 | if (copy_from_user(&info, (void __user *)arg, sizeof(info))) | |
2009 | err = -EFAULT; | |
2010 | ||
2011 | err = kcm_attach_ioctl(sock, &info); | |
2012 | ||
2013 | break; | |
2014 | } | |
2015 | case SIOCKCMUNATTACH: { | |
2016 | struct kcm_unattach info; | |
2017 | ||
2018 | if (copy_from_user(&info, (void __user *)arg, sizeof(info))) | |
2019 | err = -EFAULT; | |
2020 | ||
2021 | err = kcm_unattach_ioctl(sock, &info); | |
2022 | ||
2023 | break; | |
2024 | } | |
2025 | case SIOCKCMCLONE: { | |
2026 | struct kcm_clone info; | |
2027 | struct socket *newsock = NULL; | |
2028 | ||
2029 | if (copy_from_user(&info, (void __user *)arg, sizeof(info))) | |
2030 | err = -EFAULT; | |
2031 | ||
2032 | err = kcm_clone(sock, &info, &newsock); | |
2033 | ||
2034 | if (!err) { | |
2035 | if (copy_to_user((void __user *)arg, &info, | |
2036 | sizeof(info))) { | |
2037 | err = -EFAULT; | |
2038 | sock_release(newsock); | |
2039 | } | |
2040 | } | |
2041 | ||
2042 | break; | |
2043 | } | |
2044 | default: | |
2045 | err = -ENOIOCTLCMD; | |
2046 | break; | |
2047 | } | |
2048 | ||
2049 | return err; | |
2050 | } | |
2051 | ||
2052 | static void free_mux(struct rcu_head *rcu) | |
2053 | { | |
2054 | struct kcm_mux *mux = container_of(rcu, | |
2055 | struct kcm_mux, rcu); | |
2056 | ||
2057 | kmem_cache_free(kcm_muxp, mux); | |
2058 | } | |
2059 | ||
2060 | static void release_mux(struct kcm_mux *mux) | |
2061 | { | |
2062 | struct kcm_net *knet = mux->knet; | |
2063 | struct kcm_psock *psock, *tmp_psock; | |
2064 | ||
2065 | /* Release psocks */ | |
2066 | list_for_each_entry_safe(psock, tmp_psock, | |
2067 | &mux->psocks, psock_list) { | |
2068 | if (!WARN_ON(psock->unattaching)) | |
2069 | kcm_unattach(psock); | |
2070 | } | |
2071 | ||
2072 | if (WARN_ON(mux->psocks_cnt)) | |
2073 | return; | |
2074 | ||
2075 | __skb_queue_purge(&mux->rx_hold_queue); | |
2076 | ||
2077 | mutex_lock(&knet->mutex); | |
cd6e111b TH |
2078 | aggregate_mux_stats(&mux->stats, &knet->aggregate_mux_stats); |
2079 | aggregate_psock_stats(&mux->aggregate_psock_stats, | |
2080 | &knet->aggregate_psock_stats); | |
ab7ac4eb TH |
2081 | list_del_rcu(&mux->kcm_mux_list); |
2082 | knet->count--; | |
2083 | mutex_unlock(&knet->mutex); | |
2084 | ||
2085 | call_rcu(&mux->rcu, free_mux); | |
2086 | } | |
2087 | ||
2088 | static void kcm_done(struct kcm_sock *kcm) | |
2089 | { | |
2090 | struct kcm_mux *mux = kcm->mux; | |
2091 | struct sock *sk = &kcm->sk; | |
2092 | int socks_cnt; | |
2093 | ||
2094 | spin_lock_bh(&mux->rx_lock); | |
2095 | if (kcm->rx_psock) { | |
2096 | /* Cleanup in unreserve_rx_kcm */ | |
2097 | WARN_ON(kcm->done); | |
2098 | kcm->rx_disabled = 1; | |
2099 | kcm->done = 1; | |
2100 | spin_unlock_bh(&mux->rx_lock); | |
2101 | return; | |
2102 | } | |
2103 | ||
2104 | if (kcm->rx_wait) { | |
2105 | list_del(&kcm->wait_rx_list); | |
2106 | kcm->rx_wait = false; | |
2107 | } | |
2108 | /* Move any pending receive messages to other kcm sockets */ | |
2109 | requeue_rx_msgs(mux, &sk->sk_receive_queue); | |
2110 | ||
2111 | spin_unlock_bh(&mux->rx_lock); | |
2112 | ||
2113 | if (WARN_ON(sk_rmem_alloc_get(sk))) | |
2114 | return; | |
2115 | ||
2116 | /* Detach from MUX */ | |
2117 | spin_lock_bh(&mux->lock); | |
2118 | ||
2119 | list_del(&kcm->kcm_sock_list); | |
2120 | mux->kcm_socks_cnt--; | |
2121 | socks_cnt = mux->kcm_socks_cnt; | |
2122 | ||
2123 | spin_unlock_bh(&mux->lock); | |
2124 | ||
2125 | if (!socks_cnt) { | |
2126 | /* We are done with the mux now. */ | |
2127 | release_mux(mux); | |
2128 | } | |
2129 | ||
2130 | WARN_ON(kcm->rx_wait); | |
2131 | ||
2132 | sock_put(&kcm->sk); | |
2133 | } | |
2134 | ||
2135 | /* Called by kcm_release to close a KCM socket. | |
2136 | * If this is the last KCM socket on the MUX, destroy the MUX. | |
2137 | */ | |
2138 | static int kcm_release(struct socket *sock) | |
2139 | { | |
2140 | struct sock *sk = sock->sk; | |
2141 | struct kcm_sock *kcm; | |
2142 | struct kcm_mux *mux; | |
2143 | struct kcm_psock *psock; | |
2144 | ||
2145 | if (!sk) | |
2146 | return 0; | |
2147 | ||
2148 | kcm = kcm_sk(sk); | |
2149 | mux = kcm->mux; | |
2150 | ||
2151 | sock_orphan(sk); | |
2152 | kfree_skb(kcm->seq_skb); | |
2153 | ||
2154 | lock_sock(sk); | |
2155 | /* Purge queue under lock to avoid race condition with tx_work trying | |
2156 | * to act when queue is nonempty. If tx_work runs after this point | |
2157 | * it will just return. | |
2158 | */ | |
2159 | __skb_queue_purge(&sk->sk_write_queue); | |
2160 | release_sock(sk); | |
2161 | ||
2162 | spin_lock_bh(&mux->lock); | |
2163 | if (kcm->tx_wait) { | |
2164 | /* Take of tx_wait list, after this point there should be no way | |
2165 | * that a psock will be assigned to this kcm. | |
2166 | */ | |
2167 | list_del(&kcm->wait_psock_list); | |
2168 | kcm->tx_wait = false; | |
2169 | } | |
2170 | spin_unlock_bh(&mux->lock); | |
2171 | ||
2172 | /* Cancel work. After this point there should be no outside references | |
2173 | * to the kcm socket. | |
2174 | */ | |
2175 | cancel_work_sync(&kcm->tx_work); | |
2176 | ||
2177 | lock_sock(sk); | |
2178 | psock = kcm->tx_psock; | |
2179 | if (psock) { | |
2180 | /* A psock was reserved, so we need to kill it since it | |
2181 | * may already have some bytes queued from a message. We | |
2182 | * need to do this after removing kcm from tx_wait list. | |
2183 | */ | |
2184 | kcm_abort_tx_psock(psock, EPIPE, false); | |
2185 | unreserve_psock(kcm); | |
2186 | } | |
2187 | release_sock(sk); | |
2188 | ||
2189 | WARN_ON(kcm->tx_wait); | |
2190 | WARN_ON(kcm->tx_psock); | |
2191 | ||
2192 | sock->sk = NULL; | |
2193 | ||
2194 | kcm_done(kcm); | |
2195 | ||
2196 | return 0; | |
2197 | } | |
2198 | ||
91687355 | 2199 | static const struct proto_ops kcm_dgram_ops = { |
ab7ac4eb TH |
2200 | .family = PF_KCM, |
2201 | .owner = THIS_MODULE, | |
2202 | .release = kcm_release, | |
2203 | .bind = sock_no_bind, | |
2204 | .connect = sock_no_connect, | |
2205 | .socketpair = sock_no_socketpair, | |
2206 | .accept = sock_no_accept, | |
2207 | .getname = sock_no_getname, | |
2208 | .poll = datagram_poll, | |
2209 | .ioctl = kcm_ioctl, | |
2210 | .listen = sock_no_listen, | |
2211 | .shutdown = sock_no_shutdown, | |
2212 | .setsockopt = kcm_setsockopt, | |
2213 | .getsockopt = kcm_getsockopt, | |
2214 | .sendmsg = kcm_sendmsg, | |
2215 | .recvmsg = kcm_recvmsg, | |
2216 | .mmap = sock_no_mmap, | |
f29698fc | 2217 | .sendpage = kcm_sendpage, |
ab7ac4eb TH |
2218 | }; |
2219 | ||
91687355 TH |
2220 | static const struct proto_ops kcm_seqpacket_ops = { |
2221 | .family = PF_KCM, | |
2222 | .owner = THIS_MODULE, | |
2223 | .release = kcm_release, | |
2224 | .bind = sock_no_bind, | |
2225 | .connect = sock_no_connect, | |
2226 | .socketpair = sock_no_socketpair, | |
2227 | .accept = sock_no_accept, | |
2228 | .getname = sock_no_getname, | |
2229 | .poll = datagram_poll, | |
2230 | .ioctl = kcm_ioctl, | |
2231 | .listen = sock_no_listen, | |
2232 | .shutdown = sock_no_shutdown, | |
2233 | .setsockopt = kcm_setsockopt, | |
2234 | .getsockopt = kcm_getsockopt, | |
2235 | .sendmsg = kcm_sendmsg, | |
2236 | .recvmsg = kcm_recvmsg, | |
2237 | .mmap = sock_no_mmap, | |
f29698fc | 2238 | .sendpage = kcm_sendpage, |
91687355 TH |
2239 | .splice_read = kcm_splice_read, |
2240 | }; | |
2241 | ||
ab7ac4eb TH |
2242 | /* Create proto operation for kcm sockets */ |
2243 | static int kcm_create(struct net *net, struct socket *sock, | |
2244 | int protocol, int kern) | |
2245 | { | |
2246 | struct kcm_net *knet = net_generic(net, kcm_net_id); | |
2247 | struct sock *sk; | |
2248 | struct kcm_mux *mux; | |
2249 | ||
2250 | switch (sock->type) { | |
2251 | case SOCK_DGRAM: | |
91687355 TH |
2252 | sock->ops = &kcm_dgram_ops; |
2253 | break; | |
ab7ac4eb | 2254 | case SOCK_SEQPACKET: |
91687355 | 2255 | sock->ops = &kcm_seqpacket_ops; |
ab7ac4eb TH |
2256 | break; |
2257 | default: | |
2258 | return -ESOCKTNOSUPPORT; | |
2259 | } | |
2260 | ||
2261 | if (protocol != KCMPROTO_CONNECTED) | |
2262 | return -EPROTONOSUPPORT; | |
2263 | ||
2264 | sk = sk_alloc(net, PF_KCM, GFP_KERNEL, &kcm_proto, kern); | |
2265 | if (!sk) | |
2266 | return -ENOMEM; | |
2267 | ||
2268 | /* Allocate a kcm mux, shared between KCM sockets */ | |
2269 | mux = kmem_cache_zalloc(kcm_muxp, GFP_KERNEL); | |
2270 | if (!mux) { | |
2271 | sk_free(sk); | |
2272 | return -ENOMEM; | |
2273 | } | |
2274 | ||
2275 | spin_lock_init(&mux->lock); | |
2276 | spin_lock_init(&mux->rx_lock); | |
2277 | INIT_LIST_HEAD(&mux->kcm_socks); | |
2278 | INIT_LIST_HEAD(&mux->kcm_rx_waiters); | |
2279 | INIT_LIST_HEAD(&mux->kcm_tx_waiters); | |
2280 | ||
2281 | INIT_LIST_HEAD(&mux->psocks); | |
2282 | INIT_LIST_HEAD(&mux->psocks_ready); | |
2283 | INIT_LIST_HEAD(&mux->psocks_avail); | |
2284 | ||
2285 | mux->knet = knet; | |
2286 | ||
2287 | /* Add new MUX to list */ | |
2288 | mutex_lock(&knet->mutex); | |
2289 | list_add_rcu(&mux->kcm_mux_list, &knet->mux_list); | |
2290 | knet->count++; | |
2291 | mutex_unlock(&knet->mutex); | |
2292 | ||
2293 | skb_queue_head_init(&mux->rx_hold_queue); | |
2294 | ||
2295 | /* Init KCM socket */ | |
2296 | sock_init_data(sock, sk); | |
2297 | init_kcm_sock(kcm_sk(sk), mux); | |
2298 | ||
2299 | return 0; | |
2300 | } | |
2301 | ||
2302 | static struct net_proto_family kcm_family_ops = { | |
2303 | .family = PF_KCM, | |
2304 | .create = kcm_create, | |
2305 | .owner = THIS_MODULE, | |
2306 | }; | |
2307 | ||
2308 | static __net_init int kcm_init_net(struct net *net) | |
2309 | { | |
2310 | struct kcm_net *knet = net_generic(net, kcm_net_id); | |
2311 | ||
2312 | INIT_LIST_HEAD_RCU(&knet->mux_list); | |
2313 | mutex_init(&knet->mutex); | |
2314 | ||
2315 | return 0; | |
2316 | } | |
2317 | ||
2318 | static __net_exit void kcm_exit_net(struct net *net) | |
2319 | { | |
2320 | struct kcm_net *knet = net_generic(net, kcm_net_id); | |
2321 | ||
2322 | /* All KCM sockets should be closed at this point, which should mean | |
2323 | * that all multiplexors and psocks have been destroyed. | |
2324 | */ | |
2325 | WARN_ON(!list_empty(&knet->mux_list)); | |
2326 | } | |
2327 | ||
2328 | static struct pernet_operations kcm_net_ops = { | |
2329 | .init = kcm_init_net, | |
2330 | .exit = kcm_exit_net, | |
2331 | .id = &kcm_net_id, | |
2332 | .size = sizeof(struct kcm_net), | |
2333 | }; | |
2334 | ||
2335 | static int __init kcm_init(void) | |
2336 | { | |
2337 | int err = -ENOMEM; | |
2338 | ||
2339 | kcm_muxp = kmem_cache_create("kcm_mux_cache", | |
2340 | sizeof(struct kcm_mux), 0, | |
2341 | SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL); | |
2342 | if (!kcm_muxp) | |
2343 | goto fail; | |
2344 | ||
2345 | kcm_psockp = kmem_cache_create("kcm_psock_cache", | |
2346 | sizeof(struct kcm_psock), 0, | |
2347 | SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL); | |
2348 | if (!kcm_psockp) | |
2349 | goto fail; | |
2350 | ||
2351 | kcm_wq = create_singlethread_workqueue("kkcmd"); | |
2352 | if (!kcm_wq) | |
2353 | goto fail; | |
2354 | ||
2355 | err = proto_register(&kcm_proto, 1); | |
2356 | if (err) | |
2357 | goto fail; | |
2358 | ||
2359 | err = sock_register(&kcm_family_ops); | |
2360 | if (err) | |
2361 | goto sock_register_fail; | |
2362 | ||
2363 | err = register_pernet_device(&kcm_net_ops); | |
2364 | if (err) | |
2365 | goto net_ops_fail; | |
2366 | ||
cd6e111b TH |
2367 | err = kcm_proc_init(); |
2368 | if (err) | |
2369 | goto proc_init_fail; | |
2370 | ||
ab7ac4eb TH |
2371 | return 0; |
2372 | ||
cd6e111b TH |
2373 | proc_init_fail: |
2374 | unregister_pernet_device(&kcm_net_ops); | |
2375 | ||
ab7ac4eb TH |
2376 | net_ops_fail: |
2377 | sock_unregister(PF_KCM); | |
2378 | ||
2379 | sock_register_fail: | |
2380 | proto_unregister(&kcm_proto); | |
2381 | ||
2382 | fail: | |
2383 | kmem_cache_destroy(kcm_muxp); | |
2384 | kmem_cache_destroy(kcm_psockp); | |
2385 | ||
2386 | if (kcm_wq) | |
2387 | destroy_workqueue(kcm_wq); | |
2388 | ||
2389 | return err; | |
2390 | } | |
2391 | ||
2392 | static void __exit kcm_exit(void) | |
2393 | { | |
cd6e111b | 2394 | kcm_proc_exit(); |
ab7ac4eb TH |
2395 | unregister_pernet_device(&kcm_net_ops); |
2396 | sock_unregister(PF_KCM); | |
2397 | proto_unregister(&kcm_proto); | |
2398 | destroy_workqueue(kcm_wq); | |
2399 | ||
2400 | kmem_cache_destroy(kcm_muxp); | |
2401 | kmem_cache_destroy(kcm_psockp); | |
2402 | } | |
2403 | ||
2404 | module_init(kcm_init); | |
2405 | module_exit(kcm_exit); | |
2406 | ||
2407 | MODULE_LICENSE("GPL"); | |
2408 | MODULE_ALIAS_NETPROTO(PF_KCM); | |
2409 |