Commit | Line | Data |
---|---|---|
c0c77d8f BT |
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 | * | |
c0c77d8f BT |
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> | |
ac98d8aa | 24 | #include <linux/rculist.h> |
c0c77d8f | 25 | #include <net/xdp_sock.h> |
b9b6b68e | 26 | #include <net/xdp.h> |
c0c77d8f | 27 | |
423f3832 | 28 | #include "xsk_queue.h" |
c0c77d8f BT |
29 | #include "xdp_umem.h" |
30 | ||
35fcde7f MK |
31 | #define TX_BATCH_SIZE 16 |
32 | ||
c0c77d8f BT |
33 | static struct xdp_sock *xdp_sk(struct sock *sk) |
34 | { | |
35 | return (struct xdp_sock *)sk; | |
36 | } | |
37 | ||
fbfc504a BT |
38 | bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs) |
39 | { | |
173d3adb BT |
40 | return READ_ONCE(xs->rx) && READ_ONCE(xs->umem) && |
41 | READ_ONCE(xs->umem->fq); | |
fbfc504a BT |
42 | } |
43 | ||
173d3adb BT |
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) | |
c497176c | 57 | { |
c497176c | 58 | void *buffer; |
bbff2f32 | 59 | u64 addr; |
4e64c835 | 60 | int err; |
c497176c | 61 | |
bbff2f32 BT |
62 | if (!xskq_peek_addr(xs->umem->fq, &addr) || |
63 | len > xs->umem->chunk_size_nohr) { | |
a509a955 | 64 | xs->rx_dropped++; |
c497176c | 65 | return -ENOSPC; |
a509a955 | 66 | } |
c497176c | 67 | |
bbff2f32 BT |
68 | addr += xs->umem->headroom; |
69 | ||
70 | buffer = xdp_umem_get_data(xs->umem, addr); | |
c497176c | 71 | memcpy(buffer, xdp->data, len); |
bbff2f32 | 72 | err = xskq_produce_batch_desc(xs->rx, addr, len); |
173d3adb | 73 | if (!err) { |
bbff2f32 | 74 | xskq_discard_addr(xs->umem->fq); |
173d3adb BT |
75 | xdp_return_buff(xdp); |
76 | return 0; | |
77 | } | |
c497176c | 78 | |
173d3adb | 79 | xs->rx_dropped++; |
c497176c BT |
80 | return err; |
81 | } | |
82 | ||
173d3adb | 83 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c497176c | 84 | { |
173d3adb | 85 | int err = xskq_produce_batch_desc(xs->rx, (u64)xdp->handle, len); |
c497176c | 86 | |
173d3adb | 87 | if (err) { |
c497176c | 88 | xdp_return_buff(xdp); |
173d3adb BT |
89 | xs->rx_dropped++; |
90 | } | |
c497176c BT |
91 | |
92 | return err; | |
93 | } | |
94 | ||
173d3adb BT |
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 | ||
c497176c BT |
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 | { | |
173d3adb BT |
116 | u32 len = xdp->data_end - xdp->data; |
117 | void *buffer; | |
118 | u64 addr; | |
c497176c BT |
119 | int err; |
120 | ||
5d902372 BT |
121 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
122 | return -EINVAL; | |
123 | ||
173d3adb BT |
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); | |
c497176c | 137 | xsk_flush(xs); |
173d3adb BT |
138 | return 0; |
139 | } | |
c497176c | 140 | |
173d3adb | 141 | xs->rx_dropped++; |
c497176c BT |
142 | return err; |
143 | } | |
144 | ||
ac98d8aa MK |
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 | ||
35fcde7f MK |
198 | static void xsk_destruct_skb(struct sk_buff *skb) |
199 | { | |
bbff2f32 | 200 | u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; |
35fcde7f MK |
201 | struct xdp_sock *xs = xdp_sk(skb->sk); |
202 | ||
bbff2f32 | 203 | WARN_ON_ONCE(xskq_produce_addr(xs->umem->cq, addr)); |
35fcde7f MK |
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 | { | |
35fcde7f MK |
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; | |
35fcde7f MK |
220 | |
221 | mutex_lock(&xs->mutex); | |
222 | ||
223 | while (xskq_peek_desc(xs->tx, &desc)) { | |
224 | char *buffer; | |
bbff2f32 BT |
225 | u64 addr; |
226 | u32 len; | |
35fcde7f MK |
227 | |
228 | if (max_batch-- == 0) { | |
229 | err = -EAGAIN; | |
230 | goto out; | |
231 | } | |
232 | ||
bbff2f32 | 233 | if (xskq_reserve_addr(xs->umem->cq)) { |
35fcde7f MK |
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 | ||
2e59dd5e MK |
244 | if (xs->queue_id >= xs->dev->real_num_tx_queues) { |
245 | err = -ENXIO; | |
246 | goto out; | |
247 | } | |
248 | ||
ac98d8aa | 249 | skb = sock_alloc_send_skb(sk, len, 1, &err); |
35fcde7f MK |
250 | if (unlikely(!skb)) { |
251 | err = -EAGAIN; | |
252 | goto out; | |
253 | } | |
254 | ||
255 | skb_put(skb, len); | |
bbff2f32 BT |
256 | addr = desc.addr; |
257 | buffer = xdp_umem_get_data(xs->umem, addr); | |
35fcde7f MK |
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; | |
bbff2f32 | 267 | skb_shinfo(skb)->destructor_arg = (void *)(long)addr; |
35fcde7f MK |
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 | { | |
ac98d8aa | 292 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
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; | |
ac98d8aa MK |
300 | if (need_wait) |
301 | return -EOPNOTSUPP; | |
35fcde7f | 302 | |
ac98d8aa | 303 | return (xs->zc) ? xsk_zc_xmit(sk) : xsk_generic_xmit(sk, m, total_len); |
35fcde7f MK |
304 | } |
305 | ||
a11e1d43 LT |
306 | static unsigned int xsk_poll(struct file *file, struct socket *sock, |
307 | struct poll_table_struct *wait) | |
c497176c | 308 | { |
a11e1d43 | 309 | unsigned int mask = datagram_poll(file, sock, wait); |
c497176c BT |
310 | struct sock *sk = sock->sk; |
311 | struct xdp_sock *xs = xdp_sk(sk); | |
312 | ||
313 | if (xs->rx && !xskq_empty_desc(xs->rx)) | |
314 | mask |= POLLIN | POLLRDNORM; | |
35fcde7f MK |
315 | if (xs->tx && !xskq_full_desc(xs->tx)) |
316 | mask |= POLLOUT | POLLWRNORM; | |
c497176c BT |
317 | |
318 | return mask; | |
319 | } | |
320 | ||
b9b6b68e BT |
321 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
322 | bool umem_queue) | |
423f3832 MK |
323 | { |
324 | struct xsk_queue *q; | |
325 | ||
326 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
327 | return -EINVAL; | |
328 | ||
b9b6b68e | 329 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
330 | if (!q) |
331 | return -ENOMEM; | |
332 | ||
37b07693 BT |
333 | /* Make sure queue is ready before it can be seen by others */ |
334 | smp_wmb(); | |
423f3832 MK |
335 | *queue = q; |
336 | return 0; | |
337 | } | |
338 | ||
c0c77d8f BT |
339 | static int xsk_release(struct socket *sock) |
340 | { | |
341 | struct sock *sk = sock->sk; | |
965a9909 | 342 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
343 | struct net *net; |
344 | ||
345 | if (!sk) | |
346 | return 0; | |
347 | ||
348 | net = sock_net(sk); | |
349 | ||
350 | local_bh_disable(); | |
351 | sock_prot_inuse_add(net, sk->sk_prot, -1); | |
352 | local_bh_enable(); | |
353 | ||
965a9909 | 354 | if (xs->dev) { |
959b71db BT |
355 | /* Wait for driver to stop using the xdp socket. */ |
356 | synchronize_net(); | |
357 | dev_put(xs->dev); | |
965a9909 MK |
358 | xs->dev = NULL; |
359 | } | |
360 | ||
c0c77d8f BT |
361 | sock_orphan(sk); |
362 | sock->sk = NULL; | |
363 | ||
364 | sk_refcnt_debug_release(sk); | |
365 | sock_put(sk); | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
965a9909 MK |
370 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
371 | { | |
372 | struct socket *sock; | |
373 | int err; | |
374 | ||
375 | sock = sockfd_lookup(fd, &err); | |
376 | if (!sock) | |
377 | return ERR_PTR(-ENOTSOCK); | |
378 | ||
379 | if (sock->sk->sk_family != PF_XDP) { | |
380 | sockfd_put(sock); | |
381 | return ERR_PTR(-ENOPROTOOPT); | |
382 | } | |
383 | ||
384 | return sock; | |
385 | } | |
386 | ||
387 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
388 | { | |
389 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
390 | struct sock *sk = sock->sk; | |
965a9909 | 391 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 392 | struct net_device *dev; |
173d3adb | 393 | u32 flags, qid; |
965a9909 MK |
394 | int err = 0; |
395 | ||
396 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
397 | return -EINVAL; | |
398 | if (sxdp->sxdp_family != AF_XDP) | |
399 | return -EINVAL; | |
400 | ||
401 | mutex_lock(&xs->mutex); | |
959b71db BT |
402 | if (xs->dev) { |
403 | err = -EBUSY; | |
404 | goto out_release; | |
405 | } | |
406 | ||
965a9909 MK |
407 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
408 | if (!dev) { | |
409 | err = -ENODEV; | |
410 | goto out_release; | |
411 | } | |
412 | ||
f6145903 | 413 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
414 | err = -EINVAL; |
415 | goto out_unlock; | |
416 | } | |
417 | ||
173d3adb BT |
418 | qid = sxdp->sxdp_queue_id; |
419 | ||
420 | if ((xs->rx && qid >= dev->real_num_rx_queues) || | |
421 | (xs->tx && qid >= dev->real_num_tx_queues)) { | |
965a9909 MK |
422 | err = -EINVAL; |
423 | goto out_unlock; | |
424 | } | |
425 | ||
173d3adb BT |
426 | flags = sxdp->sxdp_flags; |
427 | ||
428 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
429 | struct xdp_sock *umem_xs; |
430 | struct socket *sock; | |
431 | ||
173d3adb BT |
432 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY)) { |
433 | /* Cannot specify flags for shared sockets. */ | |
434 | err = -EINVAL; | |
435 | goto out_unlock; | |
436 | } | |
437 | ||
965a9909 MK |
438 | if (xs->umem) { |
439 | /* We have already our own. */ | |
440 | err = -EINVAL; | |
441 | goto out_unlock; | |
442 | } | |
443 | ||
444 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
445 | if (IS_ERR(sock)) { | |
446 | err = PTR_ERR(sock); | |
447 | goto out_unlock; | |
448 | } | |
449 | ||
450 | umem_xs = xdp_sk(sock->sk); | |
451 | if (!umem_xs->umem) { | |
452 | /* No umem to inherit. */ | |
453 | err = -EBADF; | |
454 | sockfd_put(sock); | |
455 | goto out_unlock; | |
173d3adb | 456 | } else if (umem_xs->dev != dev || umem_xs->queue_id != qid) { |
965a9909 MK |
457 | err = -EINVAL; |
458 | sockfd_put(sock); | |
459 | goto out_unlock; | |
460 | } | |
461 | ||
462 | xdp_get_umem(umem_xs->umem); | |
965a9909 MK |
463 | xs->umem = umem_xs->umem; |
464 | sockfd_put(sock); | |
465 | } else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) { | |
466 | err = -EINVAL; | |
467 | goto out_unlock; | |
c497176c BT |
468 | } else { |
469 | /* This xsk has its own umem. */ | |
470 | xskq_set_umem(xs->umem->fq, &xs->umem->props); | |
fe230832 | 471 | xskq_set_umem(xs->umem->cq, &xs->umem->props); |
173d3adb BT |
472 | |
473 | err = xdp_umem_assign_dev(xs->umem, dev, qid, flags); | |
474 | if (err) | |
475 | goto out_unlock; | |
965a9909 MK |
476 | } |
477 | ||
965a9909 | 478 | xs->dev = dev; |
ac98d8aa MK |
479 | xs->zc = xs->umem->zc; |
480 | xs->queue_id = qid; | |
965a9909 | 481 | xskq_set_umem(xs->rx, &xs->umem->props); |
35fcde7f | 482 | xskq_set_umem(xs->tx, &xs->umem->props); |
ac98d8aa | 483 | xdp_add_sk_umem(xs->umem, xs); |
965a9909 MK |
484 | |
485 | out_unlock: | |
486 | if (err) | |
487 | dev_put(dev); | |
488 | out_release: | |
489 | mutex_unlock(&xs->mutex); | |
490 | return err; | |
491 | } | |
492 | ||
c0c77d8f BT |
493 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
494 | char __user *optval, unsigned int optlen) | |
495 | { | |
496 | struct sock *sk = sock->sk; | |
497 | struct xdp_sock *xs = xdp_sk(sk); | |
498 | int err; | |
499 | ||
500 | if (level != SOL_XDP) | |
501 | return -ENOPROTOOPT; | |
502 | ||
503 | switch (optname) { | |
b9b6b68e | 504 | case XDP_RX_RING: |
f6145903 | 505 | case XDP_TX_RING: |
b9b6b68e BT |
506 | { |
507 | struct xsk_queue **q; | |
508 | int entries; | |
509 | ||
510 | if (optlen < sizeof(entries)) | |
511 | return -EINVAL; | |
512 | if (copy_from_user(&entries, optval, sizeof(entries))) | |
513 | return -EFAULT; | |
514 | ||
515 | mutex_lock(&xs->mutex); | |
f6145903 | 516 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e BT |
517 | err = xsk_init_queue(entries, q, false); |
518 | mutex_unlock(&xs->mutex); | |
519 | return err; | |
520 | } | |
c0c77d8f BT |
521 | case XDP_UMEM_REG: |
522 | { | |
523 | struct xdp_umem_reg mr; | |
524 | struct xdp_umem *umem; | |
525 | ||
c0c77d8f BT |
526 | if (copy_from_user(&mr, optval, sizeof(mr))) |
527 | return -EFAULT; | |
528 | ||
529 | mutex_lock(&xs->mutex); | |
a49049ea BT |
530 | if (xs->umem) { |
531 | mutex_unlock(&xs->mutex); | |
532 | return -EBUSY; | |
533 | } | |
c0c77d8f | 534 | |
a49049ea BT |
535 | umem = xdp_umem_create(&mr); |
536 | if (IS_ERR(umem)) { | |
c0c77d8f | 537 | mutex_unlock(&xs->mutex); |
a49049ea | 538 | return PTR_ERR(umem); |
c0c77d8f BT |
539 | } |
540 | ||
541 | /* Make sure umem is ready before it can be seen by others */ | |
542 | smp_wmb(); | |
c0c77d8f BT |
543 | xs->umem = umem; |
544 | mutex_unlock(&xs->mutex); | |
545 | return 0; | |
546 | } | |
423f3832 | 547 | case XDP_UMEM_FILL_RING: |
fe230832 | 548 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
549 | { |
550 | struct xsk_queue **q; | |
551 | int entries; | |
552 | ||
423f3832 MK |
553 | if (copy_from_user(&entries, optval, sizeof(entries))) |
554 | return -EFAULT; | |
555 | ||
556 | mutex_lock(&xs->mutex); | |
a49049ea BT |
557 | if (!xs->umem) { |
558 | mutex_unlock(&xs->mutex); | |
559 | return -EINVAL; | |
560 | } | |
561 | ||
fe230832 MK |
562 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq : |
563 | &xs->umem->cq; | |
b9b6b68e | 564 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
565 | mutex_unlock(&xs->mutex); |
566 | return err; | |
567 | } | |
c0c77d8f BT |
568 | default: |
569 | break; | |
570 | } | |
571 | ||
572 | return -ENOPROTOOPT; | |
573 | } | |
574 | ||
af75d9e0 MK |
575 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
576 | char __user *optval, int __user *optlen) | |
577 | { | |
578 | struct sock *sk = sock->sk; | |
579 | struct xdp_sock *xs = xdp_sk(sk); | |
580 | int len; | |
581 | ||
582 | if (level != SOL_XDP) | |
583 | return -ENOPROTOOPT; | |
584 | ||
585 | if (get_user(len, optlen)) | |
586 | return -EFAULT; | |
587 | if (len < 0) | |
588 | return -EINVAL; | |
589 | ||
590 | switch (optname) { | |
591 | case XDP_STATISTICS: | |
592 | { | |
593 | struct xdp_statistics stats; | |
594 | ||
595 | if (len < sizeof(stats)) | |
596 | return -EINVAL; | |
597 | ||
598 | mutex_lock(&xs->mutex); | |
599 | stats.rx_dropped = xs->rx_dropped; | |
600 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); | |
601 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
602 | mutex_unlock(&xs->mutex); | |
603 | ||
604 | if (copy_to_user(optval, &stats, sizeof(stats))) | |
605 | return -EFAULT; | |
606 | if (put_user(sizeof(stats), optlen)) | |
607 | return -EFAULT; | |
608 | ||
609 | return 0; | |
610 | } | |
b3a9e0be BT |
611 | case XDP_MMAP_OFFSETS: |
612 | { | |
613 | struct xdp_mmap_offsets off; | |
614 | ||
615 | if (len < sizeof(off)) | |
616 | return -EINVAL; | |
617 | ||
618 | off.rx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
619 | off.rx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
620 | off.rx.desc = offsetof(struct xdp_rxtx_ring, desc); | |
621 | off.tx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
622 | off.tx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
623 | off.tx.desc = offsetof(struct xdp_rxtx_ring, desc); | |
624 | ||
625 | off.fr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
626 | off.fr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
627 | off.fr.desc = offsetof(struct xdp_umem_ring, desc); | |
628 | off.cr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
629 | off.cr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
630 | off.cr.desc = offsetof(struct xdp_umem_ring, desc); | |
631 | ||
632 | len = sizeof(off); | |
633 | if (copy_to_user(optval, &off, len)) | |
634 | return -EFAULT; | |
635 | if (put_user(len, optlen)) | |
636 | return -EFAULT; | |
637 | ||
638 | return 0; | |
639 | } | |
af75d9e0 MK |
640 | default: |
641 | break; | |
642 | } | |
643 | ||
644 | return -EOPNOTSUPP; | |
645 | } | |
646 | ||
423f3832 MK |
647 | static int xsk_mmap(struct file *file, struct socket *sock, |
648 | struct vm_area_struct *vma) | |
649 | { | |
a5a16e43 | 650 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
651 | unsigned long size = vma->vm_end - vma->vm_start; |
652 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
653 | struct xsk_queue *q = NULL; | |
37b07693 | 654 | struct xdp_umem *umem; |
423f3832 MK |
655 | unsigned long pfn; |
656 | struct page *qpg; | |
657 | ||
b9b6b68e | 658 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 659 | q = READ_ONCE(xs->rx); |
f6145903 | 660 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 661 | q = READ_ONCE(xs->tx); |
b9b6b68e | 662 | } else { |
37b07693 BT |
663 | umem = READ_ONCE(xs->umem); |
664 | if (!umem) | |
b9b6b68e | 665 | return -EINVAL; |
423f3832 | 666 | |
b9b6b68e | 667 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
37b07693 | 668 | q = READ_ONCE(umem->fq); |
fe230832 | 669 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
37b07693 | 670 | q = READ_ONCE(umem->cq); |
b9b6b68e | 671 | } |
423f3832 MK |
672 | |
673 | if (!q) | |
674 | return -EINVAL; | |
675 | ||
676 | qpg = virt_to_head_page(q->ring); | |
677 | if (size > (PAGE_SIZE << compound_order(qpg))) | |
678 | return -EINVAL; | |
679 | ||
680 | pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; | |
681 | return remap_pfn_range(vma, vma->vm_start, pfn, | |
682 | size, vma->vm_page_prot); | |
683 | } | |
684 | ||
c0c77d8f BT |
685 | static struct proto xsk_proto = { |
686 | .name = "XDP", | |
687 | .owner = THIS_MODULE, | |
688 | .obj_size = sizeof(struct xdp_sock), | |
689 | }; | |
690 | ||
691 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
692 | .family = PF_XDP, |
693 | .owner = THIS_MODULE, | |
694 | .release = xsk_release, | |
695 | .bind = xsk_bind, | |
696 | .connect = sock_no_connect, | |
697 | .socketpair = sock_no_socketpair, | |
698 | .accept = sock_no_accept, | |
699 | .getname = sock_no_getname, | |
a11e1d43 | 700 | .poll = xsk_poll, |
c2f4374b BT |
701 | .ioctl = sock_no_ioctl, |
702 | .listen = sock_no_listen, | |
703 | .shutdown = sock_no_shutdown, | |
704 | .setsockopt = xsk_setsockopt, | |
705 | .getsockopt = xsk_getsockopt, | |
706 | .sendmsg = xsk_sendmsg, | |
707 | .recvmsg = sock_no_recvmsg, | |
708 | .mmap = xsk_mmap, | |
709 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
710 | }; |
711 | ||
712 | static void xsk_destruct(struct sock *sk) | |
713 | { | |
714 | struct xdp_sock *xs = xdp_sk(sk); | |
715 | ||
716 | if (!sock_flag(sk, SOCK_DEAD)) | |
717 | return; | |
718 | ||
b9b6b68e | 719 | xskq_destroy(xs->rx); |
f6145903 | 720 | xskq_destroy(xs->tx); |
ac98d8aa | 721 | xdp_del_sk_umem(xs->umem, xs); |
c0c77d8f BT |
722 | xdp_put_umem(xs->umem); |
723 | ||
724 | sk_refcnt_debug_dec(sk); | |
725 | } | |
726 | ||
727 | static int xsk_create(struct net *net, struct socket *sock, int protocol, | |
728 | int kern) | |
729 | { | |
730 | struct sock *sk; | |
731 | struct xdp_sock *xs; | |
732 | ||
733 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
734 | return -EPERM; | |
735 | if (sock->type != SOCK_RAW) | |
736 | return -ESOCKTNOSUPPORT; | |
737 | ||
738 | if (protocol) | |
739 | return -EPROTONOSUPPORT; | |
740 | ||
741 | sock->state = SS_UNCONNECTED; | |
742 | ||
743 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
744 | if (!sk) | |
745 | return -ENOBUFS; | |
746 | ||
747 | sock->ops = &xsk_proto_ops; | |
748 | ||
749 | sock_init_data(sock, sk); | |
750 | ||
751 | sk->sk_family = PF_XDP; | |
752 | ||
753 | sk->sk_destruct = xsk_destruct; | |
754 | sk_refcnt_debug_inc(sk); | |
755 | ||
756 | xs = xdp_sk(sk); | |
757 | mutex_init(&xs->mutex); | |
758 | ||
759 | local_bh_disable(); | |
760 | sock_prot_inuse_add(net, &xsk_proto, 1); | |
761 | local_bh_enable(); | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
766 | static const struct net_proto_family xsk_family_ops = { | |
767 | .family = PF_XDP, | |
768 | .create = xsk_create, | |
769 | .owner = THIS_MODULE, | |
770 | }; | |
771 | ||
772 | static int __init xsk_init(void) | |
773 | { | |
774 | int err; | |
775 | ||
776 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
777 | if (err) | |
778 | goto out; | |
779 | ||
780 | err = sock_register(&xsk_family_ops); | |
781 | if (err) | |
782 | goto out_proto; | |
783 | ||
784 | return 0; | |
785 | ||
786 | out_proto: | |
787 | proto_unregister(&xsk_proto); | |
788 | out: | |
789 | return err; | |
790 | } | |
791 | ||
792 | fs_initcall(xsk_init); |