1 // SPDX-License-Identifier: GPL-2.0 2 /* XDP sockets 3 * 4 * AF_XDP sockets allows a channel between XDP programs and userspace 5 * applications. 6 * Copyright(c) 2018 Intel Corporation. 7 * 8 * Author(s): Björn Töpel <bjorn.topel@intel.com> 9 * Magnus Karlsson <magnus.karlsson@intel.com> 10 */ 11 12 #define pr_fmt(fmt) "AF_XDP: %s: " fmt, __func__ 13 14 #include <linux/if_xdp.h> 15 #include <linux/init.h> 16 #include <linux/sched/mm.h> 17 #include <linux/sched/signal.h> 18 #include <linux/sched/task.h> 19 #include <linux/socket.h> 20 #include <linux/file.h> 21 #include <linux/uaccess.h> 22 #include <linux/net.h> 23 #include <linux/netdevice.h> 24 #include <linux/rculist.h> 25 #include <net/xdp_sock.h> 26 #include <net/xdp.h> 27 28 #include "xsk_queue.h" 29 #include "xdp_umem.h" 30 31 #define TX_BATCH_SIZE 16 32 33 static struct xdp_sock *xdp_sk(struct sock *sk) 34 { 35 return (struct xdp_sock *)sk; 36 } 37 38 bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs) 39 { 40 return READ_ONCE(xs->rx) && READ_ONCE(xs->umem) && 41 READ_ONCE(xs->umem->fq); 42 } 43 44 u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr) 45 { 46 return xskq_peek_addr(umem->fq, addr); 47 } 48 EXPORT_SYMBOL(xsk_umem_peek_addr); 49 50 void xsk_umem_discard_addr(struct xdp_umem *umem) 51 { 52 xskq_discard_addr(umem->fq); 53 } 54 EXPORT_SYMBOL(xsk_umem_discard_addr); 55 56 static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) 57 { 58 void *buffer; 59 u64 addr; 60 int err; 61 62 if (!xskq_peek_addr(xs->umem->fq, &addr) || 63 len > xs->umem->chunk_size_nohr) { 64 xs->rx_dropped++; 65 return -ENOSPC; 66 } 67 68 addr += xs->umem->headroom; 69 70 buffer = xdp_umem_get_data(xs->umem, addr); 71 memcpy(buffer, xdp->data, len); 72 err = xskq_produce_batch_desc(xs->rx, addr, len); 73 if (!err) { 74 xskq_discard_addr(xs->umem->fq); 75 xdp_return_buff(xdp); 76 return 0; 77 } 78 79 xs->rx_dropped++; 80 return err; 81 } 82 83 static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) 84 { 85 int err = xskq_produce_batch_desc(xs->rx, (u64)xdp->handle, len); 86 87 if (err) { 88 xdp_return_buff(xdp); 89 xs->rx_dropped++; 90 } 91 92 return err; 93 } 94 95 int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 96 { 97 u32 len; 98 99 if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) 100 return -EINVAL; 101 102 len = xdp->data_end - xdp->data; 103 104 return (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY) ? 105 __xsk_rcv_zc(xs, xdp, len) : __xsk_rcv(xs, xdp, len); 106 } 107 108 void xsk_flush(struct xdp_sock *xs) 109 { 110 xskq_produce_flush_desc(xs->rx); 111 xs->sk.sk_data_ready(&xs->sk); 112 } 113 114 int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 115 { 116 u32 len = xdp->data_end - xdp->data; 117 void *buffer; 118 u64 addr; 119 int err; 120 121 if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) 122 return -EINVAL; 123 124 if (!xskq_peek_addr(xs->umem->fq, &addr) || 125 len > xs->umem->chunk_size_nohr) { 126 xs->rx_dropped++; 127 return -ENOSPC; 128 } 129 130 addr += xs->umem->headroom; 131 132 buffer = xdp_umem_get_data(xs->umem, addr); 133 memcpy(buffer, xdp->data, len); 134 err = xskq_produce_batch_desc(xs->rx, addr, len); 135 if (!err) { 136 xskq_discard_addr(xs->umem->fq); 137 xsk_flush(xs); 138 return 0; 139 } 140 141 xs->rx_dropped++; 142 return err; 143 } 144 145 void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries) 146 { 147 xskq_produce_flush_addr_n(umem->cq, nb_entries); 148 } 149 EXPORT_SYMBOL(xsk_umem_complete_tx); 150 151 void xsk_umem_consume_tx_done(struct xdp_umem *umem) 152 { 153 struct xdp_sock *xs; 154 155 rcu_read_lock(); 156 list_for_each_entry_rcu(xs, &umem->xsk_list, list) { 157 xs->sk.sk_write_space(&xs->sk); 158 } 159 rcu_read_unlock(); 160 } 161 EXPORT_SYMBOL(xsk_umem_consume_tx_done); 162 163 bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len) 164 { 165 struct xdp_desc desc; 166 struct xdp_sock *xs; 167 168 rcu_read_lock(); 169 list_for_each_entry_rcu(xs, &umem->xsk_list, list) { 170 if (!xskq_peek_desc(xs->tx, &desc)) 171 continue; 172 173 if (xskq_produce_addr_lazy(umem->cq, desc.addr)) 174 goto out; 175 176 *dma = xdp_umem_get_dma(umem, desc.addr); 177 *len = desc.len; 178 179 xskq_discard_desc(xs->tx); 180 rcu_read_unlock(); 181 return true; 182 } 183 184 out: 185 rcu_read_unlock(); 186 return false; 187 } 188 EXPORT_SYMBOL(xsk_umem_consume_tx); 189 190 static int xsk_zc_xmit(struct sock *sk) 191 { 192 struct xdp_sock *xs = xdp_sk(sk); 193 struct net_device *dev = xs->dev; 194 195 return dev->netdev_ops->ndo_xsk_async_xmit(dev, xs->queue_id); 196 } 197 198 static void xsk_destruct_skb(struct sk_buff *skb) 199 { 200 u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; 201 struct xdp_sock *xs = xdp_sk(skb->sk); 202 203 WARN_ON_ONCE(xskq_produce_addr(xs->umem->cq, addr)); 204 205 sock_wfree(skb); 206 } 207 208 static int xsk_generic_xmit(struct sock *sk, struct msghdr *m, 209 size_t total_len) 210 { 211 u32 max_batch = TX_BATCH_SIZE; 212 struct xdp_sock *xs = xdp_sk(sk); 213 bool sent_frame = false; 214 struct xdp_desc desc; 215 struct sk_buff *skb; 216 int err = 0; 217 218 if (unlikely(!xs->tx)) 219 return -ENOBUFS; 220 221 mutex_lock(&xs->mutex); 222 223 while (xskq_peek_desc(xs->tx, &desc)) { 224 char *buffer; 225 u64 addr; 226 u32 len; 227 228 if (max_batch-- == 0) { 229 err = -EAGAIN; 230 goto out; 231 } 232 233 if (xskq_reserve_addr(xs->umem->cq)) { 234 err = -EAGAIN; 235 goto out; 236 } 237 238 len = desc.len; 239 if (unlikely(len > xs->dev->mtu)) { 240 err = -EMSGSIZE; 241 goto out; 242 } 243 244 if (xs->queue_id >= xs->dev->real_num_tx_queues) { 245 err = -ENXIO; 246 goto out; 247 } 248 249 skb = sock_alloc_send_skb(sk, len, 1, &err); 250 if (unlikely(!skb)) { 251 err = -EAGAIN; 252 goto out; 253 } 254 255 skb_put(skb, len); 256 addr = desc.addr; 257 buffer = xdp_umem_get_data(xs->umem, addr); 258 err = skb_store_bits(skb, 0, buffer, len); 259 if (unlikely(err)) { 260 kfree_skb(skb); 261 goto out; 262 } 263 264 skb->dev = xs->dev; 265 skb->priority = sk->sk_priority; 266 skb->mark = sk->sk_mark; 267 skb_shinfo(skb)->destructor_arg = (void *)(long)addr; 268 skb->destructor = xsk_destruct_skb; 269 270 err = dev_direct_xmit(skb, xs->queue_id); 271 /* Ignore NET_XMIT_CN as packet might have been sent */ 272 if (err == NET_XMIT_DROP || err == NETDEV_TX_BUSY) { 273 err = -EAGAIN; 274 /* SKB consumed by dev_direct_xmit() */ 275 goto out; 276 } 277 278 sent_frame = true; 279 xskq_discard_desc(xs->tx); 280 } 281 282 out: 283 if (sent_frame) 284 sk->sk_write_space(sk); 285 286 mutex_unlock(&xs->mutex); 287 return err; 288 } 289 290 static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) 291 { 292 bool need_wait = !(m->msg_flags & MSG_DONTWAIT); 293 struct sock *sk = sock->sk; 294 struct xdp_sock *xs = xdp_sk(sk); 295 296 if (unlikely(!xs->dev)) 297 return -ENXIO; 298 if (unlikely(!(xs->dev->flags & IFF_UP))) 299 return -ENETDOWN; 300 if (need_wait) 301 return -EOPNOTSUPP; 302 303 return (xs->zc) ? xsk_zc_xmit(sk) : xsk_generic_xmit(sk, m, total_len); 304 } 305 306 static __poll_t xsk_poll_mask(struct socket *sock, __poll_t events) 307 { 308 __poll_t mask = datagram_poll_mask(sock, events); 309 struct sock *sk = sock->sk; 310 struct xdp_sock *xs = xdp_sk(sk); 311 312 if (xs->rx && !xskq_empty_desc(xs->rx)) 313 mask |= POLLIN | POLLRDNORM; 314 if (xs->tx && !xskq_full_desc(xs->tx)) 315 mask |= POLLOUT | POLLWRNORM; 316 317 return mask; 318 } 319 320 static int xsk_init_queue(u32 entries, struct xsk_queue **queue, 321 bool umem_queue) 322 { 323 struct xsk_queue *q; 324 325 if (entries == 0 || *queue || !is_power_of_2(entries)) 326 return -EINVAL; 327 328 q = xskq_create(entries, umem_queue); 329 if (!q) 330 return -ENOMEM; 331 332 /* Make sure queue is ready before it can be seen by others */ 333 smp_wmb(); 334 *queue = q; 335 return 0; 336 } 337 338 static int xsk_release(struct socket *sock) 339 { 340 struct sock *sk = sock->sk; 341 struct xdp_sock *xs = xdp_sk(sk); 342 struct net *net; 343 344 if (!sk) 345 return 0; 346 347 net = sock_net(sk); 348 349 local_bh_disable(); 350 sock_prot_inuse_add(net, sk->sk_prot, -1); 351 local_bh_enable(); 352 353 if (xs->dev) { 354 /* Wait for driver to stop using the xdp socket. */ 355 synchronize_net(); 356 dev_put(xs->dev); 357 xs->dev = NULL; 358 } 359 360 sock_orphan(sk); 361 sock->sk = NULL; 362 363 sk_refcnt_debug_release(sk); 364 sock_put(sk); 365 366 return 0; 367 } 368 369 static struct socket *xsk_lookup_xsk_from_fd(int fd) 370 { 371 struct socket *sock; 372 int err; 373 374 sock = sockfd_lookup(fd, &err); 375 if (!sock) 376 return ERR_PTR(-ENOTSOCK); 377 378 if (sock->sk->sk_family != PF_XDP) { 379 sockfd_put(sock); 380 return ERR_PTR(-ENOPROTOOPT); 381 } 382 383 return sock; 384 } 385 386 static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) 387 { 388 struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; 389 struct sock *sk = sock->sk; 390 struct xdp_sock *xs = xdp_sk(sk); 391 struct net_device *dev; 392 u32 flags, qid; 393 int err = 0; 394 395 if (addr_len < sizeof(struct sockaddr_xdp)) 396 return -EINVAL; 397 if (sxdp->sxdp_family != AF_XDP) 398 return -EINVAL; 399 400 mutex_lock(&xs->mutex); 401 if (xs->dev) { 402 err = -EBUSY; 403 goto out_release; 404 } 405 406 dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); 407 if (!dev) { 408 err = -ENODEV; 409 goto out_release; 410 } 411 412 if (!xs->rx && !xs->tx) { 413 err = -EINVAL; 414 goto out_unlock; 415 } 416 417 qid = sxdp->sxdp_queue_id; 418 419 if ((xs->rx && qid >= dev->real_num_rx_queues) || 420 (xs->tx && qid >= dev->real_num_tx_queues)) { 421 err = -EINVAL; 422 goto out_unlock; 423 } 424 425 flags = sxdp->sxdp_flags; 426 427 if (flags & XDP_SHARED_UMEM) { 428 struct xdp_sock *umem_xs; 429 struct socket *sock; 430 431 if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY)) { 432 /* Cannot specify flags for shared sockets. */ 433 err = -EINVAL; 434 goto out_unlock; 435 } 436 437 if (xs->umem) { 438 /* We have already our own. */ 439 err = -EINVAL; 440 goto out_unlock; 441 } 442 443 sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); 444 if (IS_ERR(sock)) { 445 err = PTR_ERR(sock); 446 goto out_unlock; 447 } 448 449 umem_xs = xdp_sk(sock->sk); 450 if (!umem_xs->umem) { 451 /* No umem to inherit. */ 452 err = -EBADF; 453 sockfd_put(sock); 454 goto out_unlock; 455 } else if (umem_xs->dev != dev || umem_xs->queue_id != qid) { 456 err = -EINVAL; 457 sockfd_put(sock); 458 goto out_unlock; 459 } 460 461 xdp_get_umem(umem_xs->umem); 462 xs->umem = umem_xs->umem; 463 sockfd_put(sock); 464 } else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) { 465 err = -EINVAL; 466 goto out_unlock; 467 } else { 468 /* This xsk has its own umem. */ 469 xskq_set_umem(xs->umem->fq, &xs->umem->props); 470 xskq_set_umem(xs->umem->cq, &xs->umem->props); 471 472 err = xdp_umem_assign_dev(xs->umem, dev, qid, flags); 473 if (err) 474 goto out_unlock; 475 } 476 477 xs->dev = dev; 478 xs->zc = xs->umem->zc; 479 xs->queue_id = qid; 480 xskq_set_umem(xs->rx, &xs->umem->props); 481 xskq_set_umem(xs->tx, &xs->umem->props); 482 xdp_add_sk_umem(xs->umem, xs); 483 484 out_unlock: 485 if (err) 486 dev_put(dev); 487 out_release: 488 mutex_unlock(&xs->mutex); 489 return err; 490 } 491 492 static int xsk_setsockopt(struct socket *sock, int level, int optname, 493 char __user *optval, unsigned int optlen) 494 { 495 struct sock *sk = sock->sk; 496 struct xdp_sock *xs = xdp_sk(sk); 497 int err; 498 499 if (level != SOL_XDP) 500 return -ENOPROTOOPT; 501 502 switch (optname) { 503 case XDP_RX_RING: 504 case XDP_TX_RING: 505 { 506 struct xsk_queue **q; 507 int entries; 508 509 if (optlen < sizeof(entries)) 510 return -EINVAL; 511 if (copy_from_user(&entries, optval, sizeof(entries))) 512 return -EFAULT; 513 514 mutex_lock(&xs->mutex); 515 q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; 516 err = xsk_init_queue(entries, q, false); 517 mutex_unlock(&xs->mutex); 518 return err; 519 } 520 case XDP_UMEM_REG: 521 { 522 struct xdp_umem_reg mr; 523 struct xdp_umem *umem; 524 525 if (copy_from_user(&mr, optval, sizeof(mr))) 526 return -EFAULT; 527 528 mutex_lock(&xs->mutex); 529 if (xs->umem) { 530 mutex_unlock(&xs->mutex); 531 return -EBUSY; 532 } 533 534 umem = xdp_umem_create(&mr); 535 if (IS_ERR(umem)) { 536 mutex_unlock(&xs->mutex); 537 return PTR_ERR(umem); 538 } 539 540 /* Make sure umem is ready before it can be seen by others */ 541 smp_wmb(); 542 xs->umem = umem; 543 mutex_unlock(&xs->mutex); 544 return 0; 545 } 546 case XDP_UMEM_FILL_RING: 547 case XDP_UMEM_COMPLETION_RING: 548 { 549 struct xsk_queue **q; 550 int entries; 551 552 if (copy_from_user(&entries, optval, sizeof(entries))) 553 return -EFAULT; 554 555 mutex_lock(&xs->mutex); 556 if (!xs->umem) { 557 mutex_unlock(&xs->mutex); 558 return -EINVAL; 559 } 560 561 q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq : 562 &xs->umem->cq; 563 err = xsk_init_queue(entries, q, true); 564 mutex_unlock(&xs->mutex); 565 return err; 566 } 567 default: 568 break; 569 } 570 571 return -ENOPROTOOPT; 572 } 573 574 static int xsk_getsockopt(struct socket *sock, int level, int optname, 575 char __user *optval, int __user *optlen) 576 { 577 struct sock *sk = sock->sk; 578 struct xdp_sock *xs = xdp_sk(sk); 579 int len; 580 581 if (level != SOL_XDP) 582 return -ENOPROTOOPT; 583 584 if (get_user(len, optlen)) 585 return -EFAULT; 586 if (len < 0) 587 return -EINVAL; 588 589 switch (optname) { 590 case XDP_STATISTICS: 591 { 592 struct xdp_statistics stats; 593 594 if (len < sizeof(stats)) 595 return -EINVAL; 596 597 mutex_lock(&xs->mutex); 598 stats.rx_dropped = xs->rx_dropped; 599 stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); 600 stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); 601 mutex_unlock(&xs->mutex); 602 603 if (copy_to_user(optval, &stats, sizeof(stats))) 604 return -EFAULT; 605 if (put_user(sizeof(stats), optlen)) 606 return -EFAULT; 607 608 return 0; 609 } 610 case XDP_MMAP_OFFSETS: 611 { 612 struct xdp_mmap_offsets off; 613 614 if (len < sizeof(off)) 615 return -EINVAL; 616 617 off.rx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); 618 off.rx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); 619 off.rx.desc = offsetof(struct xdp_rxtx_ring, desc); 620 off.tx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); 621 off.tx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); 622 off.tx.desc = offsetof(struct xdp_rxtx_ring, desc); 623 624 off.fr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); 625 off.fr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); 626 off.fr.desc = offsetof(struct xdp_umem_ring, desc); 627 off.cr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); 628 off.cr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); 629 off.cr.desc = offsetof(struct xdp_umem_ring, desc); 630 631 len = sizeof(off); 632 if (copy_to_user(optval, &off, len)) 633 return -EFAULT; 634 if (put_user(len, optlen)) 635 return -EFAULT; 636 637 return 0; 638 } 639 default: 640 break; 641 } 642 643 return -EOPNOTSUPP; 644 } 645 646 static int xsk_mmap(struct file *file, struct socket *sock, 647 struct vm_area_struct *vma) 648 { 649 loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; 650 unsigned long size = vma->vm_end - vma->vm_start; 651 struct xdp_sock *xs = xdp_sk(sock->sk); 652 struct xsk_queue *q = NULL; 653 struct xdp_umem *umem; 654 unsigned long pfn; 655 struct page *qpg; 656 657 if (offset == XDP_PGOFF_RX_RING) { 658 q = READ_ONCE(xs->rx); 659 } else if (offset == XDP_PGOFF_TX_RING) { 660 q = READ_ONCE(xs->tx); 661 } else { 662 umem = READ_ONCE(xs->umem); 663 if (!umem) 664 return -EINVAL; 665 666 if (offset == XDP_UMEM_PGOFF_FILL_RING) 667 q = READ_ONCE(umem->fq); 668 else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) 669 q = READ_ONCE(umem->cq); 670 } 671 672 if (!q) 673 return -EINVAL; 674 675 qpg = virt_to_head_page(q->ring); 676 if (size > (PAGE_SIZE << compound_order(qpg))) 677 return -EINVAL; 678 679 pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; 680 return remap_pfn_range(vma, vma->vm_start, pfn, 681 size, vma->vm_page_prot); 682 } 683 684 static struct proto xsk_proto = { 685 .name = "XDP", 686 .owner = THIS_MODULE, 687 .obj_size = sizeof(struct xdp_sock), 688 }; 689 690 static const struct proto_ops xsk_proto_ops = { 691 .family = PF_XDP, 692 .owner = THIS_MODULE, 693 .release = xsk_release, 694 .bind = xsk_bind, 695 .connect = sock_no_connect, 696 .socketpair = sock_no_socketpair, 697 .accept = sock_no_accept, 698 .getname = sock_no_getname, 699 .poll_mask = xsk_poll_mask, 700 .ioctl = sock_no_ioctl, 701 .listen = sock_no_listen, 702 .shutdown = sock_no_shutdown, 703 .setsockopt = xsk_setsockopt, 704 .getsockopt = xsk_getsockopt, 705 .sendmsg = xsk_sendmsg, 706 .recvmsg = sock_no_recvmsg, 707 .mmap = xsk_mmap, 708 .sendpage = sock_no_sendpage, 709 }; 710 711 static void xsk_destruct(struct sock *sk) 712 { 713 struct xdp_sock *xs = xdp_sk(sk); 714 715 if (!sock_flag(sk, SOCK_DEAD)) 716 return; 717 718 xskq_destroy(xs->rx); 719 xskq_destroy(xs->tx); 720 xdp_del_sk_umem(xs->umem, xs); 721 xdp_put_umem(xs->umem); 722 723 sk_refcnt_debug_dec(sk); 724 } 725 726 static int xsk_create(struct net *net, struct socket *sock, int protocol, 727 int kern) 728 { 729 struct sock *sk; 730 struct xdp_sock *xs; 731 732 if (!ns_capable(net->user_ns, CAP_NET_RAW)) 733 return -EPERM; 734 if (sock->type != SOCK_RAW) 735 return -ESOCKTNOSUPPORT; 736 737 if (protocol) 738 return -EPROTONOSUPPORT; 739 740 sock->state = SS_UNCONNECTED; 741 742 sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); 743 if (!sk) 744 return -ENOBUFS; 745 746 sock->ops = &xsk_proto_ops; 747 748 sock_init_data(sock, sk); 749 750 sk->sk_family = PF_XDP; 751 752 sk->sk_destruct = xsk_destruct; 753 sk_refcnt_debug_inc(sk); 754 755 xs = xdp_sk(sk); 756 mutex_init(&xs->mutex); 757 758 local_bh_disable(); 759 sock_prot_inuse_add(net, &xsk_proto, 1); 760 local_bh_enable(); 761 762 return 0; 763 } 764 765 static const struct net_proto_family xsk_family_ops = { 766 .family = PF_XDP, 767 .create = xsk_create, 768 .owner = THIS_MODULE, 769 }; 770 771 static int __init xsk_init(void) 772 { 773 int err; 774 775 err = proto_register(&xsk_proto, 0 /* no slab */); 776 if (err) 777 goto out; 778 779 err = sock_register(&xsk_family_ops); 780 if (err) 781 goto out_proto; 782 783 return 0; 784 785 out_proto: 786 proto_unregister(&xsk_proto); 787 out: 788 return err; 789 } 790 791 fs_initcall(xsk_init); 792