Lines Matching +full:default +full:- +full:tap
1 // SPDX-License-Identifier: GPL-2.0-only
37 return q->flags & TAP_VNET_BE ? false : in tap_legacy_is_little_endian()
43 int s = !!(q->flags & TAP_VNET_BE); in tap_get_vnet_be()
46 return -EFAULT; in tap_get_vnet_be()
56 return -EFAULT; in tap_set_vnet_be()
59 q->flags |= TAP_VNET_BE; in tap_set_vnet_be()
61 q->flags &= ~TAP_VNET_BE; in tap_set_vnet_be()
73 return -EINVAL; in tap_get_vnet_be()
78 return -EINVAL; in tap_set_vnet_be()
84 return q->flags & TAP_VNET_LE || in tap_is_little_endian()
99 .name = "tap",
126 return rcu_dereference(dev->rx_handler_data); in tap_dev_get_rcu()
136 * through sock_hold(&q->sk). When the macvlan_dev goes away first,
137 * q->vlan becomes inaccessible. When the files gets closed,
146 static int tap_enable_queue(struct tap_dev *tap, struct file *file, in tap_enable_queue() argument
149 int err = -EINVAL; in tap_enable_queue()
153 if (q->enabled) in tap_enable_queue()
157 rcu_assign_pointer(tap->taps[tap->numvtaps], q); in tap_enable_queue()
158 q->queue_index = tap->numvtaps; in tap_enable_queue()
159 q->enabled = true; in tap_enable_queue()
161 tap->numvtaps++; in tap_enable_queue()
167 static int tap_set_queue(struct tap_dev *tap, struct file *file, in tap_set_queue() argument
170 if (tap->numqueues == MAX_TAP_QUEUES) in tap_set_queue()
171 return -EBUSY; in tap_set_queue()
173 rcu_assign_pointer(q->tap, tap); in tap_set_queue()
174 rcu_assign_pointer(tap->taps[tap->numvtaps], q); in tap_set_queue()
175 sock_hold(&q->sk); in tap_set_queue()
177 q->file = file; in tap_set_queue()
178 q->queue_index = tap->numvtaps; in tap_set_queue()
179 q->enabled = true; in tap_set_queue()
180 file->private_data = q; in tap_set_queue()
181 list_add_tail(&q->next, &tap->queue_list); in tap_set_queue()
183 tap->numvtaps++; in tap_set_queue()
184 tap->numqueues++; in tap_set_queue()
191 struct tap_dev *tap; in tap_disable_queue() local
195 if (!q->enabled) in tap_disable_queue()
196 return -EINVAL; in tap_disable_queue()
198 tap = rtnl_dereference(q->tap); in tap_disable_queue()
200 if (tap) { in tap_disable_queue()
201 int index = q->queue_index; in tap_disable_queue()
202 BUG_ON(index >= tap->numvtaps); in tap_disable_queue()
203 nq = rtnl_dereference(tap->taps[tap->numvtaps - 1]); in tap_disable_queue()
204 nq->queue_index = index; in tap_disable_queue()
206 rcu_assign_pointer(tap->taps[index], nq); in tap_disable_queue()
207 RCU_INIT_POINTER(tap->taps[tap->numvtaps - 1], NULL); in tap_disable_queue()
208 q->enabled = false; in tap_disable_queue()
210 tap->numvtaps--; in tap_disable_queue()
226 struct tap_dev *tap; in tap_put_queue() local
229 tap = rtnl_dereference(q->tap); in tap_put_queue()
231 if (tap) { in tap_put_queue()
232 if (q->enabled) in tap_put_queue()
235 tap->numqueues--; in tap_put_queue()
236 RCU_INIT_POINTER(q->tap, NULL); in tap_put_queue()
237 sock_put(&q->sk); in tap_put_queue()
238 list_del_init(&q->next); in tap_put_queue()
244 sock_put(&q->sk); in tap_put_queue()
251 * Cache vlan->numvtaps since it can become zero during the execution
254 static struct tap_queue *tap_get_queue(struct tap_dev *tap, in tap_get_queue() argument
260 * and validate that the result isn't NULL - in case we are in tap_get_queue()
263 int numvtaps = READ_ONCE(tap->numvtaps); in tap_get_queue()
275 queue = rcu_dereference(tap->taps[rxq % numvtaps]); in tap_get_queue()
283 rxq -= numvtaps; in tap_get_queue()
285 queue = rcu_dereference(tap->taps[rxq]); in tap_get_queue()
290 queue = rcu_dereference(tap->taps[0]); in tap_get_queue()
300 void tap_del_queues(struct tap_dev *tap) in tap_del_queues() argument
305 list_for_each_entry_safe(q, tmp, &tap->queue_list, next) { in tap_del_queues()
306 list_del_init(&q->next); in tap_del_queues()
307 RCU_INIT_POINTER(q->tap, NULL); in tap_del_queues()
308 if (q->enabled) in tap_del_queues()
309 tap->numvtaps--; in tap_del_queues()
310 tap->numqueues--; in tap_del_queues()
311 sock_put(&q->sk); in tap_del_queues()
313 BUG_ON(tap->numvtaps); in tap_del_queues()
314 BUG_ON(tap->numqueues); in tap_del_queues()
316 tap->numvtaps = MAX_TAP_QUEUES; in tap_del_queues()
323 struct net_device *dev = skb->dev; in tap_handle_frame()
324 struct tap_dev *tap; in tap_handle_frame() local
329 tap = tap_dev_get_rcu(dev); in tap_handle_frame()
330 if (!tap) in tap_handle_frame()
333 q = tap_get_queue(tap, skb); in tap_handle_frame()
343 if (q->flags & IFF_VNET_HDR) in tap_handle_frame()
344 features |= tap->tap_features; in tap_handle_frame()
355 if (ptr_ring_produce(&q->ring, skb)) { in tap_handle_frame()
365 if (ptr_ring_produce(&q->ring, skb)) { in tap_handle_frame()
373 /* If we receive a partial checksum and the tap side in tap_handle_frame()
378 if (skb->ip_summed == CHECKSUM_PARTIAL && in tap_handle_frame()
384 if (ptr_ring_produce(&q->ring, skb)) { in tap_handle_frame()
391 wake_up_interruptible_poll(sk_sleep(&q->sk), EPOLLIN | EPOLLRDNORM | EPOLLRDBAND); in tap_handle_frame()
396 if (tap->count_rx_dropped) in tap_handle_frame()
397 tap->count_rx_dropped(tap); in tap_handle_frame()
408 if (tap_major->major == major) in tap_get_major()
415 int tap_get_minor(dev_t major, struct tap_dev *tap) in tap_get_minor() argument
417 int retval = -ENOMEM; in tap_get_minor()
423 retval = -EINVAL; in tap_get_minor()
427 spin_lock(&tap_major->minor_lock); in tap_get_minor()
428 retval = idr_alloc(&tap_major->minor_idr, tap, 1, TAP_NUM_DEVS, GFP_ATOMIC); in tap_get_minor()
430 tap->minor = retval; in tap_get_minor()
431 } else if (retval == -ENOSPC) { in tap_get_minor()
432 netdev_err(tap->dev, "Too many tap devices\n"); in tap_get_minor()
433 retval = -EINVAL; in tap_get_minor()
435 spin_unlock(&tap_major->minor_lock); in tap_get_minor()
443 void tap_free_minor(dev_t major, struct tap_dev *tap) in tap_free_minor() argument
453 spin_lock(&tap_major->minor_lock); in tap_free_minor()
454 if (tap->minor) { in tap_free_minor()
455 idr_remove(&tap_major->minor_idr, tap->minor); in tap_free_minor()
456 tap->minor = 0; in tap_free_minor()
458 spin_unlock(&tap_major->minor_lock); in tap_free_minor()
468 struct tap_dev *tap; in dev_get_by_tap_file() local
474 tap = NULL; in dev_get_by_tap_file()
478 spin_lock(&tap_major->minor_lock); in dev_get_by_tap_file()
479 tap = idr_find(&tap_major->minor_idr, minor); in dev_get_by_tap_file()
480 if (tap) { in dev_get_by_tap_file()
481 dev = tap->dev; in dev_get_by_tap_file()
484 spin_unlock(&tap_major->minor_lock); in dev_get_by_tap_file()
488 return tap; in dev_get_by_tap_file()
496 !test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) in tap_sock_write_space()
508 ptr_ring_cleanup(&q->ring, __skb_array_destroy_skb); in tap_sock_destruct()
513 struct net *net = current->nsproxy->net_ns; in tap_open()
514 struct tap_dev *tap; in tap_open() local
516 int err = -ENODEV; in tap_open()
519 tap = dev_get_by_tap_file(imajor(inode), iminor(inode)); in tap_open()
520 if (!tap) in tap_open()
523 err = -ENOMEM; in tap_open()
528 if (ptr_ring_init(&q->ring, tap->dev->tx_queue_len, GFP_KERNEL)) { in tap_open()
529 sk_free(&q->sk); in tap_open()
533 init_waitqueue_head(&q->sock.wq.wait); in tap_open()
534 q->sock.type = SOCK_RAW; in tap_open()
535 q->sock.state = SS_CONNECTED; in tap_open()
536 q->sock.file = file; in tap_open()
537 q->sock.ops = &tap_socket_ops; in tap_open()
538 sock_init_data_uid(&q->sock, &q->sk, current_fsuid()); in tap_open()
539 q->sk.sk_write_space = tap_sock_write_space; in tap_open()
540 q->sk.sk_destruct = tap_sock_destruct; in tap_open()
541 q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP; in tap_open()
542 q->vnet_hdr_sz = sizeof(struct virtio_net_hdr); in tap_open()
545 * so far only KVM virtio_net uses tap, enable zero copy between in tap_open()
551 if ((tap->dev->features & NETIF_F_HIGHDMA) && (tap->dev->features & NETIF_F_SG)) in tap_open()
552 sock_set_flag(&q->sk, SOCK_ZEROCOPY); in tap_open()
554 err = tap_set_queue(tap, file, q); in tap_open()
560 /* tap groks IOCB_NOWAIT just fine, mark it as such */ in tap_open()
561 file->f_mode |= FMODE_NOWAIT; in tap_open()
563 dev_put(tap->dev); in tap_open()
569 sock_put(&q->sk); in tap_open()
571 if (tap) in tap_open()
572 dev_put(tap->dev); in tap_open()
580 struct tap_queue *q = file->private_data; in tap_release()
587 struct tap_queue *q = file->private_data; in tap_poll()
594 poll_wait(file, &q->sock.wq.wait, wait); in tap_poll()
596 if (!ptr_ring_empty(&q->ring)) in tap_poll()
599 if (sock_writeable(&q->sk) || in tap_poll()
600 (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &q->sock.flags) && in tap_poll()
601 sock_writeable(&q->sk))) in tap_poll()
618 if (len - linear > MAX_SKB_FRAGS * (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) in tap_alloc_skb()
619 linear = len - MAX_SKB_FRAGS * (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER); in tap_alloc_skb()
620 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, in tap_alloc_skb()
627 skb->data_len = len - linear; in tap_alloc_skb()
628 skb->len += len - linear; in tap_alloc_skb()
642 struct tap_dev *tap; in tap_get_user() local
654 if (q->flags & IFF_VNET_HDR) { in tap_get_user()
655 vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz); in tap_get_user()
657 err = -EINVAL; in tap_get_user()
660 len -= vnet_hdr_len; in tap_get_user()
662 err = -EFAULT; in tap_get_user()
665 iov_iter_advance(from, vnet_hdr_len - sizeof(vnet_hdr)); in tap_get_user()
673 err = -EINVAL; in tap_get_user()
678 err = -EINVAL; in tap_get_user()
682 if (msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) { in tap_get_user()
707 skb = tap_alloc_skb(&q->sk, TAP_RESERVE, copylen, in tap_get_user()
724 skb->protocol = eth_hdr(skb)->h_proto; in tap_get_user()
727 tap = rcu_dereference(q->tap); in tap_get_user()
728 if (!tap) { in tap_get_user()
733 skb->dev = tap->dev; in tap_get_user()
748 if (eth_type_vlan(skb->protocol) && in tap_get_user()
749 vlan_get_protocol_and_depth(skb, skb->protocol, &depth) != 0) in tap_get_user()
757 uarg->ops->complete(NULL, uarg, false); in tap_get_user()
769 tap = rcu_dereference(q->tap); in tap_get_user()
770 if (tap && tap->count_tx_dropped) in tap_get_user()
771 tap->count_tx_dropped(tap); in tap_get_user()
779 struct file *file = iocb->ki_filp; in tap_write_iter()
780 struct tap_queue *q = file->private_data; in tap_write_iter()
783 if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT)) in tap_write_iter()
799 if (q->flags & IFF_VNET_HDR) { in tap_put_user()
803 vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz); in tap_put_user()
805 return -EINVAL; in tap_put_user()
814 return -EFAULT; in tap_put_user()
816 iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr)); in tap_put_user()
819 total += skb->len; in tap_put_user()
826 veth.h_vlan_proto = skb->vlan_proto; in tap_put_user()
842 skb->len - vlan_offset); in tap_put_user()
865 prepare_to_wait(sk_sleep(&q->sk), &wait, in tap_do_read()
869 skb = ptr_ring_consume(&q->ring); in tap_do_read()
873 ret = -EAGAIN; in tap_do_read()
877 ret = -ERESTARTSYS; in tap_do_read()
884 finish_wait(sk_sleep(&q->sk), &wait); in tap_do_read()
899 struct file *file = iocb->ki_filp; in tap_read_iter()
900 struct tap_queue *q = file->private_data; in tap_read_iter()
904 if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT)) in tap_read_iter()
910 iocb->ki_pos = ret; in tap_read_iter()
916 struct tap_dev *tap; in tap_get_tap_dev() local
919 tap = rtnl_dereference(q->tap); in tap_get_tap_dev()
920 if (tap) in tap_get_tap_dev()
921 dev_hold(tap->dev); in tap_get_tap_dev()
923 return tap; in tap_get_tap_dev()
926 static void tap_put_tap_dev(struct tap_dev *tap) in tap_put_tap_dev() argument
928 dev_put(tap->dev); in tap_put_tap_dev()
933 struct tap_queue *q = file->private_data; in tap_ioctl_set_queue()
934 struct tap_dev *tap; in tap_ioctl_set_queue() local
937 tap = tap_get_tap_dev(q); in tap_ioctl_set_queue()
938 if (!tap) in tap_ioctl_set_queue()
939 return -EINVAL; in tap_ioctl_set_queue()
942 ret = tap_enable_queue(tap, file, q); in tap_ioctl_set_queue()
946 ret = -EINVAL; in tap_ioctl_set_queue()
948 tap_put_tap_dev(tap); in tap_ioctl_set_queue()
954 struct tap_dev *tap; in set_offload() local
958 tap = rtnl_dereference(q->tap); in set_offload()
959 if (!tap) in set_offload()
960 return -ENOLINK; in set_offload()
962 features = tap->dev->features; in set_offload()
981 /* tun/tap driver inverts the usage for TSO offloads, where in set_offload()
985 * For tap, we have to invert it to mean the same thing. in set_offload()
987 * user-space will not receive TSO frames. in set_offload()
995 /* tap_features are the same as features on tun/tap and in set_offload()
998 tap->tap_features = feature_mask; in set_offload()
999 if (tap->update_features) in set_offload()
1000 tap->update_features(tap, features); in set_offload()
1006 * provide compatibility with generic tun/tap interface
1011 struct tap_queue *q = file->private_data; in tap_ioctl()
1012 struct tap_dev *tap; in tap_ioctl() local
1025 if (get_user(u, &ifr->ifr_flags)) in tap_ioctl()
1026 return -EFAULT; in tap_ioctl()
1030 ret = -EINVAL; in tap_ioctl()
1032 q->flags = (q->flags & ~TAP_IFFEATURES) | u; in tap_ioctl()
1038 tap = tap_get_tap_dev(q); in tap_ioctl()
1039 if (!tap) { in tap_ioctl()
1041 return -ENOLINK; in tap_ioctl()
1045 u = q->flags; in tap_ioctl()
1046 if (copy_to_user(&ifr->ifr_name, tap->dev->name, IFNAMSIZ) || in tap_ioctl()
1047 put_user(u, &ifr->ifr_flags)) in tap_ioctl()
1048 ret = -EFAULT; in tap_ioctl()
1049 tap_put_tap_dev(tap); in tap_ioctl()
1054 if (get_user(u, &ifr->ifr_flags)) in tap_ioctl()
1055 return -EFAULT; in tap_ioctl()
1063 return -EFAULT; in tap_ioctl()
1068 return -EFAULT; in tap_ioctl()
1070 return -EINVAL; in tap_ioctl()
1072 q->sk.sk_sndbuf = s; in tap_ioctl()
1076 s = q->vnet_hdr_sz; in tap_ioctl()
1078 return -EFAULT; in tap_ioctl()
1083 return -EFAULT; in tap_ioctl()
1085 return -EINVAL; in tap_ioctl()
1087 q->vnet_hdr_sz = s; in tap_ioctl()
1091 s = !!(q->flags & TAP_VNET_LE); in tap_ioctl()
1093 return -EFAULT; in tap_ioctl()
1098 return -EFAULT; in tap_ioctl()
1100 q->flags |= TAP_VNET_LE; in tap_ioctl()
1102 q->flags &= ~TAP_VNET_LE; in tap_ioctl()
1116 return -EINVAL; in tap_ioctl()
1125 tap = tap_get_tap_dev(q); in tap_ioctl()
1126 if (!tap) { in tap_ioctl()
1128 return -ENOLINK; in tap_ioctl()
1131 dev_get_mac_address(&sa, dev_net(tap->dev), tap->dev->name); in tap_ioctl()
1132 if (copy_to_user(&ifr->ifr_name, tap->dev->name, IFNAMSIZ) || in tap_ioctl()
1133 copy_to_user(&ifr->ifr_hwaddr, &sa, sizeof(sa))) in tap_ioctl()
1134 ret = -EFAULT; in tap_ioctl()
1135 tap_put_tap_dev(tap); in tap_ioctl()
1140 if (copy_from_user(&sa, &ifr->ifr_hwaddr, sizeof(sa))) in tap_ioctl()
1141 return -EFAULT; in tap_ioctl()
1143 tap = tap_get_tap_dev(q); in tap_ioctl()
1144 if (!tap) { in tap_ioctl()
1146 return -ENOLINK; in tap_ioctl()
1148 ret = dev_set_mac_address_user(tap->dev, &sa, NULL); in tap_ioctl()
1149 tap_put_tap_dev(tap); in tap_ioctl()
1153 default: in tap_ioctl()
1154 return -EINVAL; in tap_ioctl()
1171 struct tun_xdp_hdr *hdr = xdp->data_hard_start; in tap_get_user_xdp()
1172 struct virtio_net_hdr *gso = &hdr->gso; in tap_get_user_xdp()
1173 int buflen = hdr->buflen; in tap_get_user_xdp()
1175 struct tap_dev *tap; in tap_get_user_xdp() local
1179 if (unlikely(xdp->data_end - xdp->data < ETH_HLEN)) { in tap_get_user_xdp()
1180 err = -EINVAL; in tap_get_user_xdp()
1184 if (q->flags & IFF_VNET_HDR) in tap_get_user_xdp()
1185 vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz); in tap_get_user_xdp()
1187 skb = build_skb(xdp->data_hard_start, buflen); in tap_get_user_xdp()
1189 err = -ENOMEM; in tap_get_user_xdp()
1193 skb_reserve(skb, xdp->data - xdp->data_hard_start); in tap_get_user_xdp()
1194 skb_put(skb, xdp->data_end - xdp->data); in tap_get_user_xdp()
1198 skb->protocol = eth_hdr(skb)->h_proto; in tap_get_user_xdp()
1207 if (eth_type_vlan(skb->protocol) && in tap_get_user_xdp()
1208 vlan_get_protocol_and_depth(skb, skb->protocol, &depth) != 0) in tap_get_user_xdp()
1212 tap = rcu_dereference(q->tap); in tap_get_user_xdp()
1213 if (tap) { in tap_get_user_xdp()
1214 skb->dev = tap->dev; in tap_get_user_xdp()
1228 tap = rcu_dereference(q->tap); in tap_get_user_xdp()
1229 if (tap && tap->count_tx_dropped) in tap_get_user_xdp()
1230 tap->count_tx_dropped(tap); in tap_get_user_xdp()
1239 struct tun_msg_ctl *ctl = m->msg_control; in tap_sendmsg()
1243 if (m->msg_controllen == sizeof(struct tun_msg_ctl) && in tap_sendmsg()
1244 ctl && ctl->type == TUN_MSG_PTR) { in tap_sendmsg()
1245 for (i = 0; i < ctl->num; i++) { in tap_sendmsg()
1246 xdp = &((struct xdp_buff *)ctl->ptr)[i]; in tap_sendmsg()
1252 return tap_get_user(q, ctl ? ctl->ptr : NULL, &m->msg_iter, in tap_sendmsg()
1253 m->msg_flags & MSG_DONTWAIT); in tap_sendmsg()
1260 struct sk_buff *skb = m->msg_control; in tap_recvmsg()
1264 return -EINVAL; in tap_recvmsg()
1266 ret = tap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT, skb); in tap_recvmsg()
1268 m->msg_flags |= MSG_TRUNC; in tap_recvmsg()
1278 return PTR_RING_PEEK_CALL(&q->ring, __skb_array_len_with_tag); in tap_peek_len()
1295 if (file->f_op != &tap_fops) in tap_get_socket()
1296 return ERR_PTR(-EINVAL); in tap_get_socket()
1297 q = file->private_data; in tap_get_socket()
1299 return ERR_PTR(-EBADFD); in tap_get_socket()
1300 return &q->sock; in tap_get_socket()
1308 if (file->f_op != &tap_fops) in tap_get_ptr_ring()
1309 return ERR_PTR(-EINVAL); in tap_get_ptr_ring()
1310 q = file->private_data; in tap_get_ptr_ring()
1312 return ERR_PTR(-EBADFD); in tap_get_ptr_ring()
1313 return &q->ring; in tap_get_ptr_ring()
1317 int tap_queue_resize(struct tap_dev *tap) in tap_queue_resize() argument
1319 struct net_device *dev = tap->dev; in tap_queue_resize()
1322 int n = tap->numqueues; in tap_queue_resize()
1327 return -ENOMEM; in tap_queue_resize()
1329 list_for_each_entry(q, &tap->queue_list, next) in tap_queue_resize()
1330 rings[i++] = &q->ring; in tap_queue_resize()
1333 dev->tx_queue_len, GFP_KERNEL, in tap_queue_resize()
1347 return -ENOMEM; in tap_list_add()
1349 tap_major->major = MAJOR(major); in tap_list_add()
1351 idr_init(&tap_major->minor_idr); in tap_list_add()
1352 spin_lock_init(&tap_major->minor_lock); in tap_list_add()
1354 tap_major->device_name = device_name; in tap_list_add()
1356 list_add_tail_rcu(&tap_major->next, &major_list); in tap_list_add()
1370 tap_cdev->owner = module; in tap_create_cdev()
1397 if (tap_major->major == MAJOR(major)) { in tap_destroy_cdev()
1398 idr_destroy(&tap_major->minor_idr); in tap_destroy_cdev()
1399 list_del_rcu(&tap_major->next); in tap_destroy_cdev()
1406 MODULE_DESCRIPTION("Common library for drivers implementing the TAP interface");