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TOMOYO Linux Cross Reference
Linux/net/ipv4/tcp_bpf.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /* Copyright (c) 2017 - 2018 Covalent IO, Inc. http://covalent.io */
  3 
  4 #include <linux/skmsg.h>
  5 #include <linux/filter.h>
  6 #include <linux/bpf.h>
  7 #include <linux/init.h>
  8 #include <linux/wait.h>
  9 
 10 #include <net/inet_common.h>
 11 #include <net/tls.h>
 12 
 13 int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock,
 14                       struct msghdr *msg, int len, int flags)
 15 {
 16         struct iov_iter *iter = &msg->msg_iter;
 17         int peek = flags & MSG_PEEK;
 18         int i, ret, copied = 0;
 19         struct sk_msg *msg_rx;
 20 
 21         msg_rx = list_first_entry_or_null(&psock->ingress_msg,
 22                                           struct sk_msg, list);
 23 
 24         while (copied != len) {
 25                 struct scatterlist *sge;
 26 
 27                 if (unlikely(!msg_rx))
 28                         break;
 29 
 30                 i = msg_rx->sg.start;
 31                 do {
 32                         struct page *page;
 33                         int copy;
 34 
 35                         sge = sk_msg_elem(msg_rx, i);
 36                         copy = sge->length;
 37                         page = sg_page(sge);
 38                         if (copied + copy > len)
 39                                 copy = len - copied;
 40                         ret = copy_page_to_iter(page, sge->offset, copy, iter);
 41                         if (ret != copy) {
 42                                 msg_rx->sg.start = i;
 43                                 return -EFAULT;
 44                         }
 45 
 46                         copied += copy;
 47                         if (likely(!peek)) {
 48                                 sge->offset += copy;
 49                                 sge->length -= copy;
 50                                 sk_mem_uncharge(sk, copy);
 51                                 msg_rx->sg.size -= copy;
 52 
 53                                 if (!sge->length) {
 54                                         sk_msg_iter_var_next(i);
 55                                         if (!msg_rx->skb)
 56                                                 put_page(page);
 57                                 }
 58                         } else {
 59                                 sk_msg_iter_var_next(i);
 60                         }
 61 
 62                         if (copied == len)
 63                                 break;
 64                 } while (i != msg_rx->sg.end);
 65 
 66                 if (unlikely(peek)) {
 67                         if (msg_rx == list_last_entry(&psock->ingress_msg,
 68                                                       struct sk_msg, list))
 69                                 break;
 70                         msg_rx = list_next_entry(msg_rx, list);
 71                         continue;
 72                 }
 73 
 74                 msg_rx->sg.start = i;
 75                 if (!sge->length && msg_rx->sg.start == msg_rx->sg.end) {
 76                         list_del(&msg_rx->list);
 77                         if (msg_rx->skb)
 78                                 consume_skb(msg_rx->skb);
 79                         kfree(msg_rx);
 80                 }
 81                 msg_rx = list_first_entry_or_null(&psock->ingress_msg,
 82                                                   struct sk_msg, list);
 83         }
 84 
 85         return copied;
 86 }
 87 EXPORT_SYMBOL_GPL(__tcp_bpf_recvmsg);
 88 
 89 static int bpf_tcp_ingress(struct sock *sk, struct sk_psock *psock,
 90                            struct sk_msg *msg, u32 apply_bytes, int flags)
 91 {
 92         bool apply = apply_bytes;
 93         struct scatterlist *sge;
 94         u32 size, copied = 0;
 95         struct sk_msg *tmp;
 96         int i, ret = 0;
 97 
 98         tmp = kzalloc(sizeof(*tmp), __GFP_NOWARN | GFP_KERNEL);
 99         if (unlikely(!tmp))
100                 return -ENOMEM;
101 
102         lock_sock(sk);
103         tmp->sg.start = msg->sg.start;
104         i = msg->sg.start;
105         do {
106                 sge = sk_msg_elem(msg, i);
107                 size = (apply && apply_bytes < sge->length) ?
108                         apply_bytes : sge->length;
109                 if (!sk_wmem_schedule(sk, size)) {
110                         if (!copied)
111                                 ret = -ENOMEM;
112                         break;
113                 }
114 
115                 sk_mem_charge(sk, size);
116                 sk_msg_xfer(tmp, msg, i, size);
117                 copied += size;
118                 if (sge->length)
119                         get_page(sk_msg_page(tmp, i));
120                 sk_msg_iter_var_next(i);
121                 tmp->sg.end = i;
122                 if (apply) {
123                         apply_bytes -= size;
124                         if (!apply_bytes)
125                                 break;
126                 }
127         } while (i != msg->sg.end);
128 
129         if (!ret) {
130                 msg->sg.start = i;
131                 sk_psock_queue_msg(psock, tmp);
132                 sk_psock_data_ready(sk, psock);
133         } else {
134                 sk_msg_free(sk, tmp);
135                 kfree(tmp);
136         }
137 
138         release_sock(sk);
139         return ret;
140 }
141 
142 static int tcp_bpf_push(struct sock *sk, struct sk_msg *msg, u32 apply_bytes,
143                         int flags, bool uncharge)
144 {
145         bool apply = apply_bytes;
146         struct scatterlist *sge;
147         struct page *page;
148         int size, ret = 0;
149         u32 off;
150 
151         while (1) {
152                 bool has_tx_ulp;
153 
154                 sge = sk_msg_elem(msg, msg->sg.start);
155                 size = (apply && apply_bytes < sge->length) ?
156                         apply_bytes : sge->length;
157                 off  = sge->offset;
158                 page = sg_page(sge);
159 
160                 tcp_rate_check_app_limited(sk);
161 retry:
162                 has_tx_ulp = tls_sw_has_ctx_tx(sk);
163                 if (has_tx_ulp) {
164                         flags |= MSG_SENDPAGE_NOPOLICY;
165                         ret = kernel_sendpage_locked(sk,
166                                                      page, off, size, flags);
167                 } else {
168                         ret = do_tcp_sendpages(sk, page, off, size, flags);
169                 }
170 
171                 if (ret <= 0)
172                         return ret;
173                 if (apply)
174                         apply_bytes -= ret;
175                 msg->sg.size -= ret;
176                 sge->offset += ret;
177                 sge->length -= ret;
178                 if (uncharge)
179                         sk_mem_uncharge(sk, ret);
180                 if (ret != size) {
181                         size -= ret;
182                         off  += ret;
183                         goto retry;
184                 }
185                 if (!sge->length) {
186                         put_page(page);
187                         sk_msg_iter_next(msg, start);
188                         sg_init_table(sge, 1);
189                         if (msg->sg.start == msg->sg.end)
190                                 break;
191                 }
192                 if (apply && !apply_bytes)
193                         break;
194         }
195 
196         return 0;
197 }
198 
199 static int tcp_bpf_push_locked(struct sock *sk, struct sk_msg *msg,
200                                u32 apply_bytes, int flags, bool uncharge)
201 {
202         int ret;
203 
204         lock_sock(sk);
205         ret = tcp_bpf_push(sk, msg, apply_bytes, flags, uncharge);
206         release_sock(sk);
207         return ret;
208 }
209 
210 int tcp_bpf_sendmsg_redir(struct sock *sk, struct sk_msg *msg,
211                           u32 bytes, int flags)
212 {
213         bool ingress = sk_msg_to_ingress(msg);
214         struct sk_psock *psock = sk_psock_get(sk);
215         int ret;
216 
217         if (unlikely(!psock)) {
218                 sk_msg_free(sk, msg);
219                 return 0;
220         }
221         ret = ingress ? bpf_tcp_ingress(sk, psock, msg, bytes, flags) :
222                         tcp_bpf_push_locked(sk, msg, bytes, flags, false);
223         sk_psock_put(sk, psock);
224         return ret;
225 }
226 EXPORT_SYMBOL_GPL(tcp_bpf_sendmsg_redir);
227 
228 #ifdef CONFIG_BPF_STREAM_PARSER
229 static bool tcp_bpf_stream_read(const struct sock *sk)
230 {
231         struct sk_psock *psock;
232         bool empty = true;
233 
234         rcu_read_lock();
235         psock = sk_psock(sk);
236         if (likely(psock))
237                 empty = list_empty(&psock->ingress_msg);
238         rcu_read_unlock();
239         return !empty;
240 }
241 
242 static int tcp_bpf_wait_data(struct sock *sk, struct sk_psock *psock,
243                              int flags, long timeo, int *err)
244 {
245         DEFINE_WAIT_FUNC(wait, woken_wake_function);
246         int ret = 0;
247 
248         if (sk->sk_shutdown & RCV_SHUTDOWN)
249                 return 1;
250 
251         if (!timeo)
252                 return ret;
253 
254         add_wait_queue(sk_sleep(sk), &wait);
255         sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
256         ret = sk_wait_event(sk, &timeo,
257                             !list_empty(&psock->ingress_msg) ||
258                             !skb_queue_empty(&sk->sk_receive_queue), &wait);
259         sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
260         remove_wait_queue(sk_sleep(sk), &wait);
261         return ret;
262 }
263 
264 static int tcp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
265                     int nonblock, int flags, int *addr_len)
266 {
267         struct sk_psock *psock;
268         int copied, ret;
269 
270         if (unlikely(flags & MSG_ERRQUEUE))
271                 return inet_recv_error(sk, msg, len, addr_len);
272 
273         psock = sk_psock_get(sk);
274         if (unlikely(!psock))
275                 return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
276         if (!skb_queue_empty(&sk->sk_receive_queue) &&
277             sk_psock_queue_empty(psock)) {
278                 sk_psock_put(sk, psock);
279                 return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
280         }
281         lock_sock(sk);
282 msg_bytes_ready:
283         copied = __tcp_bpf_recvmsg(sk, psock, msg, len, flags);
284         if (!copied) {
285                 int data, err = 0;
286                 long timeo;
287 
288                 timeo = sock_rcvtimeo(sk, nonblock);
289                 data = tcp_bpf_wait_data(sk, psock, flags, timeo, &err);
290                 if (data) {
291                         if (!sk_psock_queue_empty(psock))
292                                 goto msg_bytes_ready;
293                         release_sock(sk);
294                         sk_psock_put(sk, psock);
295                         return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
296                 }
297                 if (err) {
298                         ret = err;
299                         goto out;
300                 }
301                 copied = -EAGAIN;
302         }
303         ret = copied;
304 out:
305         release_sock(sk);
306         sk_psock_put(sk, psock);
307         return ret;
308 }
309 
310 static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
311                                 struct sk_msg *msg, int *copied, int flags)
312 {
313         bool cork = false, enospc = sk_msg_full(msg);
314         struct sock *sk_redir;
315         u32 tosend, delta = 0;
316         int ret;
317 
318 more_data:
319         if (psock->eval == __SK_NONE) {
320                 /* Track delta in msg size to add/subtract it on SK_DROP from
321                  * returned to user copied size. This ensures user doesn't
322                  * get a positive return code with msg_cut_data and SK_DROP
323                  * verdict.
324                  */
325                 delta = msg->sg.size;
326                 psock->eval = sk_psock_msg_verdict(sk, psock, msg);
327                 delta -= msg->sg.size;
328         }
329 
330         if (msg->cork_bytes &&
331             msg->cork_bytes > msg->sg.size && !enospc) {
332                 psock->cork_bytes = msg->cork_bytes - msg->sg.size;
333                 if (!psock->cork) {
334                         psock->cork = kzalloc(sizeof(*psock->cork),
335                                               GFP_ATOMIC | __GFP_NOWARN);
336                         if (!psock->cork)
337                                 return -ENOMEM;
338                 }
339                 memcpy(psock->cork, msg, sizeof(*msg));
340                 return 0;
341         }
342 
343         tosend = msg->sg.size;
344         if (psock->apply_bytes && psock->apply_bytes < tosend)
345                 tosend = psock->apply_bytes;
346 
347         switch (psock->eval) {
348         case __SK_PASS:
349                 ret = tcp_bpf_push(sk, msg, tosend, flags, true);
350                 if (unlikely(ret)) {
351                         *copied -= sk_msg_free(sk, msg);
352                         break;
353                 }
354                 sk_msg_apply_bytes(psock, tosend);
355                 break;
356         case __SK_REDIRECT:
357                 sk_redir = psock->sk_redir;
358                 sk_msg_apply_bytes(psock, tosend);
359                 if (psock->cork) {
360                         cork = true;
361                         psock->cork = NULL;
362                 }
363                 sk_msg_return(sk, msg, tosend);
364                 release_sock(sk);
365                 ret = tcp_bpf_sendmsg_redir(sk_redir, msg, tosend, flags);
366                 lock_sock(sk);
367                 if (unlikely(ret < 0)) {
368                         int free = sk_msg_free_nocharge(sk, msg);
369 
370                         if (!cork)
371                                 *copied -= free;
372                 }
373                 if (cork) {
374                         sk_msg_free(sk, msg);
375                         kfree(msg);
376                         msg = NULL;
377                         ret = 0;
378                 }
379                 break;
380         case __SK_DROP:
381         default:
382                 sk_msg_free_partial(sk, msg, tosend);
383                 sk_msg_apply_bytes(psock, tosend);
384                 *copied -= (tosend + delta);
385                 return -EACCES;
386         }
387 
388         if (likely(!ret)) {
389                 if (!psock->apply_bytes) {
390                         psock->eval =  __SK_NONE;
391                         if (psock->sk_redir) {
392                                 sock_put(psock->sk_redir);
393                                 psock->sk_redir = NULL;
394                         }
395                 }
396                 if (msg &&
397                     msg->sg.data[msg->sg.start].page_link &&
398                     msg->sg.data[msg->sg.start].length)
399                         goto more_data;
400         }
401         return ret;
402 }
403 
404 static int tcp_bpf_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
405 {
406         struct sk_msg tmp, *msg_tx = NULL;
407         int copied = 0, err = 0;
408         struct sk_psock *psock;
409         long timeo;
410         int flags;
411 
412         /* Don't let internal do_tcp_sendpages() flags through */
413         flags = (msg->msg_flags & ~MSG_SENDPAGE_DECRYPTED);
414         flags |= MSG_NO_SHARED_FRAGS;
415 
416         psock = sk_psock_get(sk);
417         if (unlikely(!psock))
418                 return tcp_sendmsg(sk, msg, size);
419 
420         lock_sock(sk);
421         timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
422         while (msg_data_left(msg)) {
423                 bool enospc = false;
424                 u32 copy, osize;
425 
426                 if (sk->sk_err) {
427                         err = -sk->sk_err;
428                         goto out_err;
429                 }
430 
431                 copy = msg_data_left(msg);
432                 if (!sk_stream_memory_free(sk))
433                         goto wait_for_sndbuf;
434                 if (psock->cork) {
435                         msg_tx = psock->cork;
436                 } else {
437                         msg_tx = &tmp;
438                         sk_msg_init(msg_tx);
439                 }
440 
441                 osize = msg_tx->sg.size;
442                 err = sk_msg_alloc(sk, msg_tx, msg_tx->sg.size + copy, msg_tx->sg.end - 1);
443                 if (err) {
444                         if (err != -ENOSPC)
445                                 goto wait_for_memory;
446                         enospc = true;
447                         copy = msg_tx->sg.size - osize;
448                 }
449 
450                 err = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, msg_tx,
451                                                copy);
452                 if (err < 0) {
453                         sk_msg_trim(sk, msg_tx, osize);
454                         goto out_err;
455                 }
456 
457                 copied += copy;
458                 if (psock->cork_bytes) {
459                         if (size > psock->cork_bytes)
460                                 psock->cork_bytes = 0;
461                         else
462                                 psock->cork_bytes -= size;
463                         if (psock->cork_bytes && !enospc)
464                                 goto out_err;
465                         /* All cork bytes are accounted, rerun the prog. */
466                         psock->eval = __SK_NONE;
467                         psock->cork_bytes = 0;
468                 }
469 
470                 err = tcp_bpf_send_verdict(sk, psock, msg_tx, &copied, flags);
471                 if (unlikely(err < 0))
472                         goto out_err;
473                 continue;
474 wait_for_sndbuf:
475                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
476 wait_for_memory:
477                 err = sk_stream_wait_memory(sk, &timeo);
478                 if (err) {
479                         if (msg_tx && msg_tx != psock->cork)
480                                 sk_msg_free(sk, msg_tx);
481                         goto out_err;
482                 }
483         }
484 out_err:
485         if (err < 0)
486                 err = sk_stream_error(sk, msg->msg_flags, err);
487         release_sock(sk);
488         sk_psock_put(sk, psock);
489         return copied ? copied : err;
490 }
491 
492 static int tcp_bpf_sendpage(struct sock *sk, struct page *page, int offset,
493                             size_t size, int flags)
494 {
495         struct sk_msg tmp, *msg = NULL;
496         int err = 0, copied = 0;
497         struct sk_psock *psock;
498         bool enospc = false;
499 
500         psock = sk_psock_get(sk);
501         if (unlikely(!psock))
502                 return tcp_sendpage(sk, page, offset, size, flags);
503 
504         lock_sock(sk);
505         if (psock->cork) {
506                 msg = psock->cork;
507         } else {
508                 msg = &tmp;
509                 sk_msg_init(msg);
510         }
511 
512         /* Catch case where ring is full and sendpage is stalled. */
513         if (unlikely(sk_msg_full(msg)))
514                 goto out_err;
515 
516         sk_msg_page_add(msg, page, size, offset);
517         sk_mem_charge(sk, size);
518         copied = size;
519         if (sk_msg_full(msg))
520                 enospc = true;
521         if (psock->cork_bytes) {
522                 if (size > psock->cork_bytes)
523                         psock->cork_bytes = 0;
524                 else
525                         psock->cork_bytes -= size;
526                 if (psock->cork_bytes && !enospc)
527                         goto out_err;
528                 /* All cork bytes are accounted, rerun the prog. */
529                 psock->eval = __SK_NONE;
530                 psock->cork_bytes = 0;
531         }
532 
533         err = tcp_bpf_send_verdict(sk, psock, msg, &copied, flags);
534 out_err:
535         release_sock(sk);
536         sk_psock_put(sk, psock);
537         return copied ? copied : err;
538 }
539 
540 enum {
541         TCP_BPF_IPV4,
542         TCP_BPF_IPV6,
543         TCP_BPF_NUM_PROTS,
544 };
545 
546 enum {
547         TCP_BPF_BASE,
548         TCP_BPF_TX,
549         TCP_BPF_NUM_CFGS,
550 };
551 
552 static struct proto *tcpv6_prot_saved __read_mostly;
553 static DEFINE_SPINLOCK(tcpv6_prot_lock);
554 static struct proto tcp_bpf_prots[TCP_BPF_NUM_PROTS][TCP_BPF_NUM_CFGS];
555 
556 static void tcp_bpf_rebuild_protos(struct proto prot[TCP_BPF_NUM_CFGS],
557                                    struct proto *base)
558 {
559         prot[TCP_BPF_BASE]                      = *base;
560         prot[TCP_BPF_BASE].unhash               = sock_map_unhash;
561         prot[TCP_BPF_BASE].close                = sock_map_close;
562         prot[TCP_BPF_BASE].recvmsg              = tcp_bpf_recvmsg;
563         prot[TCP_BPF_BASE].stream_memory_read   = tcp_bpf_stream_read;
564 
565         prot[TCP_BPF_TX]                        = prot[TCP_BPF_BASE];
566         prot[TCP_BPF_TX].sendmsg                = tcp_bpf_sendmsg;
567         prot[TCP_BPF_TX].sendpage               = tcp_bpf_sendpage;
568 }
569 
570 static void tcp_bpf_check_v6_needs_rebuild(struct sock *sk, struct proto *ops)
571 {
572         if (sk->sk_family == AF_INET6 &&
573             unlikely(ops != smp_load_acquire(&tcpv6_prot_saved))) {
574                 spin_lock_bh(&tcpv6_prot_lock);
575                 if (likely(ops != tcpv6_prot_saved)) {
576                         tcp_bpf_rebuild_protos(tcp_bpf_prots[TCP_BPF_IPV6], ops);
577                         smp_store_release(&tcpv6_prot_saved, ops);
578                 }
579                 spin_unlock_bh(&tcpv6_prot_lock);
580         }
581 }
582 
583 static int __init tcp_bpf_v4_build_proto(void)
584 {
585         tcp_bpf_rebuild_protos(tcp_bpf_prots[TCP_BPF_IPV4], &tcp_prot);
586         return 0;
587 }
588 core_initcall(tcp_bpf_v4_build_proto);
589 
590 static int tcp_bpf_assert_proto_ops(struct proto *ops)
591 {
592         /* In order to avoid retpoline, we make assumptions when we call
593          * into ops if e.g. a psock is not present. Make sure they are
594          * indeed valid assumptions.
595          */
596         return ops->recvmsg  == tcp_recvmsg &&
597                ops->sendmsg  == tcp_sendmsg &&
598                ops->sendpage == tcp_sendpage ? 0 : -ENOTSUPP;
599 }
600 
601 struct proto *tcp_bpf_get_proto(struct sock *sk, struct sk_psock *psock)
602 {
603         int family = sk->sk_family == AF_INET6 ? TCP_BPF_IPV6 : TCP_BPF_IPV4;
604         int config = psock->progs.msg_parser   ? TCP_BPF_TX   : TCP_BPF_BASE;
605 
606         if (!psock->sk_proto) {
607                 struct proto *ops = READ_ONCE(sk->sk_prot);
608 
609                 if (tcp_bpf_assert_proto_ops(ops))
610                         return ERR_PTR(-EINVAL);
611 
612                 tcp_bpf_check_v6_needs_rebuild(sk, ops);
613         }
614 
615         return &tcp_bpf_prots[family][config];
616 }
617 
618 /* If a child got cloned from a listening socket that had tcp_bpf
619  * protocol callbacks installed, we need to restore the callbacks to
620  * the default ones because the child does not inherit the psock state
621  * that tcp_bpf callbacks expect.
622  */
623 void tcp_bpf_clone(const struct sock *sk, struct sock *newsk)
624 {
625         int family = sk->sk_family == AF_INET6 ? TCP_BPF_IPV6 : TCP_BPF_IPV4;
626         struct proto *prot = newsk->sk_prot;
627 
628         if (prot == &tcp_bpf_prots[family][TCP_BPF_BASE])
629                 newsk->sk_prot = sk->sk_prot_creator;
630 }
631 #endif /* CONFIG_BPF_STREAM_PARSER */
632 

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