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 | 29 | #include "xdp_umem.h" |
a36b38aa | 30 | #include "xsk.h" |
c0c77d8f | 31 | |
35fcde7f MK |
32 | #define TX_BATCH_SIZE 16 |
33 | ||
fbfc504a BT |
34 | bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs) |
35 | { | |
173d3adb BT |
36 | return READ_ONCE(xs->rx) && READ_ONCE(xs->umem) && |
37 | READ_ONCE(xs->umem->fq); | |
fbfc504a BT |
38 | } |
39 | ||
d57d7642 MM |
40 | bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt) |
41 | { | |
42 | return xskq_has_addrs(umem->fq, cnt); | |
43 | } | |
44 | EXPORT_SYMBOL(xsk_umem_has_addrs); | |
45 | ||
173d3adb BT |
46 | u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr) |
47 | { | |
c05cd364 | 48 | return xskq_peek_addr(umem->fq, addr, umem); |
173d3adb BT |
49 | } |
50 | EXPORT_SYMBOL(xsk_umem_peek_addr); | |
51 | ||
52 | void xsk_umem_discard_addr(struct xdp_umem *umem) | |
53 | { | |
54 | xskq_discard_addr(umem->fq); | |
55 | } | |
56 | EXPORT_SYMBOL(xsk_umem_discard_addr); | |
57 | ||
77cd0d7b MK |
58 | void xsk_set_rx_need_wakeup(struct xdp_umem *umem) |
59 | { | |
60 | if (umem->need_wakeup & XDP_WAKEUP_RX) | |
61 | return; | |
62 | ||
63 | umem->fq->ring->flags |= XDP_RING_NEED_WAKEUP; | |
64 | umem->need_wakeup |= XDP_WAKEUP_RX; | |
65 | } | |
66 | EXPORT_SYMBOL(xsk_set_rx_need_wakeup); | |
67 | ||
68 | void xsk_set_tx_need_wakeup(struct xdp_umem *umem) | |
69 | { | |
70 | struct xdp_sock *xs; | |
71 | ||
72 | if (umem->need_wakeup & XDP_WAKEUP_TX) | |
73 | return; | |
74 | ||
75 | rcu_read_lock(); | |
76 | list_for_each_entry_rcu(xs, &umem->xsk_list, list) { | |
77 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; | |
78 | } | |
79 | rcu_read_unlock(); | |
80 | ||
81 | umem->need_wakeup |= XDP_WAKEUP_TX; | |
82 | } | |
83 | EXPORT_SYMBOL(xsk_set_tx_need_wakeup); | |
84 | ||
85 | void xsk_clear_rx_need_wakeup(struct xdp_umem *umem) | |
86 | { | |
87 | if (!(umem->need_wakeup & XDP_WAKEUP_RX)) | |
88 | return; | |
89 | ||
90 | umem->fq->ring->flags &= ~XDP_RING_NEED_WAKEUP; | |
91 | umem->need_wakeup &= ~XDP_WAKEUP_RX; | |
92 | } | |
93 | EXPORT_SYMBOL(xsk_clear_rx_need_wakeup); | |
94 | ||
95 | void xsk_clear_tx_need_wakeup(struct xdp_umem *umem) | |
96 | { | |
97 | struct xdp_sock *xs; | |
98 | ||
99 | if (!(umem->need_wakeup & XDP_WAKEUP_TX)) | |
100 | return; | |
101 | ||
102 | rcu_read_lock(); | |
103 | list_for_each_entry_rcu(xs, &umem->xsk_list, list) { | |
104 | xs->tx->ring->flags &= ~XDP_RING_NEED_WAKEUP; | |
105 | } | |
106 | rcu_read_unlock(); | |
107 | ||
108 | umem->need_wakeup &= ~XDP_WAKEUP_TX; | |
109 | } | |
110 | EXPORT_SYMBOL(xsk_clear_tx_need_wakeup); | |
111 | ||
112 | bool xsk_umem_uses_need_wakeup(struct xdp_umem *umem) | |
113 | { | |
114 | return umem->flags & XDP_UMEM_USES_NEED_WAKEUP; | |
115 | } | |
116 | EXPORT_SYMBOL(xsk_umem_uses_need_wakeup); | |
117 | ||
c05cd364 KL |
118 | /* If a buffer crosses a page boundary, we need to do 2 memcpy's, one for |
119 | * each page. This is only required in copy mode. | |
120 | */ | |
121 | static void __xsk_rcv_memcpy(struct xdp_umem *umem, u64 addr, void *from_buf, | |
122 | u32 len, u32 metalen) | |
123 | { | |
124 | void *to_buf = xdp_umem_get_data(umem, addr); | |
125 | ||
126 | addr = xsk_umem_add_offset_to_addr(addr); | |
127 | if (xskq_crosses_non_contig_pg(umem, addr, len + metalen)) { | |
128 | void *next_pg_addr = umem->pages[(addr >> PAGE_SHIFT) + 1].addr; | |
129 | u64 page_start = addr & ~(PAGE_SIZE - 1); | |
130 | u64 first_len = PAGE_SIZE - (addr - page_start); | |
131 | ||
132 | memcpy(to_buf, from_buf, first_len + metalen); | |
133 | memcpy(next_pg_addr, from_buf + first_len, len - first_len); | |
134 | ||
135 | return; | |
136 | } | |
137 | ||
138 | memcpy(to_buf, from_buf, len + metalen); | |
139 | } | |
140 | ||
173d3adb | 141 | static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c497176c | 142 | { |
c05cd364 KL |
143 | u64 offset = xs->umem->headroom; |
144 | u64 addr, memcpy_addr; | |
145 | void *from_buf; | |
18baed26 | 146 | u32 metalen; |
4e64c835 | 147 | int err; |
c497176c | 148 | |
c05cd364 | 149 | if (!xskq_peek_addr(xs->umem->fq, &addr, xs->umem) || |
18baed26 | 150 | len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) { |
a509a955 | 151 | xs->rx_dropped++; |
c497176c | 152 | return -ENOSPC; |
a509a955 | 153 | } |
c497176c | 154 | |
18baed26 BT |
155 | if (unlikely(xdp_data_meta_unsupported(xdp))) { |
156 | from_buf = xdp->data; | |
157 | metalen = 0; | |
158 | } else { | |
159 | from_buf = xdp->data_meta; | |
160 | metalen = xdp->data - xdp->data_meta; | |
161 | } | |
162 | ||
c05cd364 KL |
163 | memcpy_addr = xsk_umem_adjust_offset(xs->umem, addr, offset); |
164 | __xsk_rcv_memcpy(xs->umem, memcpy_addr, from_buf, len, metalen); | |
165 | ||
166 | offset += metalen; | |
167 | addr = xsk_umem_adjust_offset(xs->umem, addr, offset); | |
bbff2f32 | 168 | err = xskq_produce_batch_desc(xs->rx, addr, len); |
173d3adb | 169 | if (!err) { |
bbff2f32 | 170 | xskq_discard_addr(xs->umem->fq); |
173d3adb BT |
171 | xdp_return_buff(xdp); |
172 | return 0; | |
173 | } | |
c497176c | 174 | |
173d3adb | 175 | xs->rx_dropped++; |
c497176c BT |
176 | return err; |
177 | } | |
178 | ||
173d3adb | 179 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c497176c | 180 | { |
173d3adb | 181 | int err = xskq_produce_batch_desc(xs->rx, (u64)xdp->handle, len); |
c497176c | 182 | |
2d55d614 | 183 | if (err) |
173d3adb | 184 | xs->rx_dropped++; |
c497176c BT |
185 | |
186 | return err; | |
187 | } | |
188 | ||
42fddcc7 BT |
189 | static bool xsk_is_bound(struct xdp_sock *xs) |
190 | { | |
191 | if (READ_ONCE(xs->state) == XSK_BOUND) { | |
192 | /* Matches smp_wmb() in bind(). */ | |
193 | smp_rmb(); | |
194 | return true; | |
195 | } | |
196 | return false; | |
197 | } | |
198 | ||
173d3adb BT |
199 | int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
200 | { | |
201 | u32 len; | |
202 | ||
42fddcc7 BT |
203 | if (!xsk_is_bound(xs)) |
204 | return -EINVAL; | |
205 | ||
173d3adb BT |
206 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
207 | return -EINVAL; | |
208 | ||
209 | len = xdp->data_end - xdp->data; | |
210 | ||
211 | return (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY) ? | |
212 | __xsk_rcv_zc(xs, xdp, len) : __xsk_rcv(xs, xdp, len); | |
213 | } | |
214 | ||
c497176c BT |
215 | void xsk_flush(struct xdp_sock *xs) |
216 | { | |
217 | xskq_produce_flush_desc(xs->rx); | |
218 | xs->sk.sk_data_ready(&xs->sk); | |
219 | } | |
220 | ||
221 | int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) | |
222 | { | |
18baed26 | 223 | u32 metalen = xdp->data - xdp->data_meta; |
173d3adb | 224 | u32 len = xdp->data_end - xdp->data; |
c05cd364 | 225 | u64 offset = xs->umem->headroom; |
173d3adb BT |
226 | void *buffer; |
227 | u64 addr; | |
c497176c BT |
228 | int err; |
229 | ||
bf0bdd13 IM |
230 | spin_lock_bh(&xs->rx_lock); |
231 | ||
232 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) { | |
233 | err = -EINVAL; | |
234 | goto out_unlock; | |
235 | } | |
5d902372 | 236 | |
c05cd364 | 237 | if (!xskq_peek_addr(xs->umem->fq, &addr, xs->umem) || |
18baed26 | 238 | len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) { |
bf0bdd13 IM |
239 | err = -ENOSPC; |
240 | goto out_drop; | |
173d3adb BT |
241 | } |
242 | ||
c05cd364 | 243 | addr = xsk_umem_adjust_offset(xs->umem, addr, offset); |
173d3adb | 244 | buffer = xdp_umem_get_data(xs->umem, addr); |
18baed26 | 245 | memcpy(buffer, xdp->data_meta, len + metalen); |
c05cd364 KL |
246 | |
247 | addr = xsk_umem_adjust_offset(xs->umem, addr, metalen); | |
173d3adb | 248 | err = xskq_produce_batch_desc(xs->rx, addr, len); |
bf0bdd13 IM |
249 | if (err) |
250 | goto out_drop; | |
251 | ||
252 | xskq_discard_addr(xs->umem->fq); | |
253 | xskq_produce_flush_desc(xs->rx); | |
c497176c | 254 | |
bf0bdd13 IM |
255 | spin_unlock_bh(&xs->rx_lock); |
256 | ||
257 | xs->sk.sk_data_ready(&xs->sk); | |
258 | return 0; | |
259 | ||
260 | out_drop: | |
173d3adb | 261 | xs->rx_dropped++; |
bf0bdd13 IM |
262 | out_unlock: |
263 | spin_unlock_bh(&xs->rx_lock); | |
c497176c BT |
264 | return err; |
265 | } | |
266 | ||
ac98d8aa MK |
267 | void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries) |
268 | { | |
269 | xskq_produce_flush_addr_n(umem->cq, nb_entries); | |
270 | } | |
271 | EXPORT_SYMBOL(xsk_umem_complete_tx); | |
272 | ||
273 | void xsk_umem_consume_tx_done(struct xdp_umem *umem) | |
274 | { | |
275 | struct xdp_sock *xs; | |
276 | ||
277 | rcu_read_lock(); | |
278 | list_for_each_entry_rcu(xs, &umem->xsk_list, list) { | |
279 | xs->sk.sk_write_space(&xs->sk); | |
280 | } | |
281 | rcu_read_unlock(); | |
282 | } | |
283 | EXPORT_SYMBOL(xsk_umem_consume_tx_done); | |
284 | ||
4bce4e5c | 285 | bool xsk_umem_consume_tx(struct xdp_umem *umem, struct xdp_desc *desc) |
ac98d8aa | 286 | { |
ac98d8aa MK |
287 | struct xdp_sock *xs; |
288 | ||
289 | rcu_read_lock(); | |
290 | list_for_each_entry_rcu(xs, &umem->xsk_list, list) { | |
c05cd364 | 291 | if (!xskq_peek_desc(xs->tx, desc, umem)) |
ac98d8aa MK |
292 | continue; |
293 | ||
4bce4e5c | 294 | if (xskq_produce_addr_lazy(umem->cq, desc->addr)) |
ac98d8aa MK |
295 | goto out; |
296 | ||
ac98d8aa MK |
297 | xskq_discard_desc(xs->tx); |
298 | rcu_read_unlock(); | |
299 | return true; | |
300 | } | |
301 | ||
302 | out: | |
303 | rcu_read_unlock(); | |
304 | return false; | |
305 | } | |
306 | EXPORT_SYMBOL(xsk_umem_consume_tx); | |
307 | ||
308 | static int xsk_zc_xmit(struct sock *sk) | |
309 | { | |
310 | struct xdp_sock *xs = xdp_sk(sk); | |
311 | struct net_device *dev = xs->dev; | |
312 | ||
9116e5e2 MK |
313 | return dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, |
314 | XDP_WAKEUP_TX); | |
ac98d8aa MK |
315 | } |
316 | ||
35fcde7f MK |
317 | static void xsk_destruct_skb(struct sk_buff *skb) |
318 | { | |
bbff2f32 | 319 | u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; |
35fcde7f | 320 | struct xdp_sock *xs = xdp_sk(skb->sk); |
a9744f7c | 321 | unsigned long flags; |
35fcde7f | 322 | |
a9744f7c | 323 | spin_lock_irqsave(&xs->tx_completion_lock, flags); |
bbff2f32 | 324 | WARN_ON_ONCE(xskq_produce_addr(xs->umem->cq, addr)); |
a9744f7c | 325 | spin_unlock_irqrestore(&xs->tx_completion_lock, flags); |
35fcde7f MK |
326 | |
327 | sock_wfree(skb); | |
328 | } | |
329 | ||
330 | static int xsk_generic_xmit(struct sock *sk, struct msghdr *m, | |
331 | size_t total_len) | |
332 | { | |
35fcde7f MK |
333 | u32 max_batch = TX_BATCH_SIZE; |
334 | struct xdp_sock *xs = xdp_sk(sk); | |
335 | bool sent_frame = false; | |
336 | struct xdp_desc desc; | |
337 | struct sk_buff *skb; | |
338 | int err = 0; | |
339 | ||
35fcde7f MK |
340 | mutex_lock(&xs->mutex); |
341 | ||
67571640 IM |
342 | if (xs->queue_id >= xs->dev->real_num_tx_queues) |
343 | goto out; | |
344 | ||
c05cd364 | 345 | while (xskq_peek_desc(xs->tx, &desc, xs->umem)) { |
35fcde7f | 346 | char *buffer; |
bbff2f32 BT |
347 | u64 addr; |
348 | u32 len; | |
35fcde7f MK |
349 | |
350 | if (max_batch-- == 0) { | |
351 | err = -EAGAIN; | |
352 | goto out; | |
353 | } | |
354 | ||
09210c4b | 355 | len = desc.len; |
ac98d8aa | 356 | skb = sock_alloc_send_skb(sk, len, 1, &err); |
35fcde7f MK |
357 | if (unlikely(!skb)) { |
358 | err = -EAGAIN; | |
359 | goto out; | |
360 | } | |
361 | ||
362 | skb_put(skb, len); | |
bbff2f32 BT |
363 | addr = desc.addr; |
364 | buffer = xdp_umem_get_data(xs->umem, addr); | |
35fcde7f | 365 | err = skb_store_bits(skb, 0, buffer, len); |
67571640 | 366 | if (unlikely(err) || xskq_reserve_addr(xs->umem->cq)) { |
35fcde7f MK |
367 | kfree_skb(skb); |
368 | goto out; | |
369 | } | |
370 | ||
371 | skb->dev = xs->dev; | |
372 | skb->priority = sk->sk_priority; | |
373 | skb->mark = sk->sk_mark; | |
c05cd364 | 374 | skb_shinfo(skb)->destructor_arg = (void *)(long)desc.addr; |
35fcde7f MK |
375 | skb->destructor = xsk_destruct_skb; |
376 | ||
377 | err = dev_direct_xmit(skb, xs->queue_id); | |
fe588685 | 378 | xskq_discard_desc(xs->tx); |
35fcde7f MK |
379 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
380 | if (err == NET_XMIT_DROP || err == NETDEV_TX_BUSY) { | |
fe588685 MK |
381 | /* SKB completed but not sent */ |
382 | err = -EBUSY; | |
35fcde7f MK |
383 | goto out; |
384 | } | |
385 | ||
386 | sent_frame = true; | |
35fcde7f MK |
387 | } |
388 | ||
389 | out: | |
390 | if (sent_frame) | |
391 | sk->sk_write_space(sk); | |
392 | ||
393 | mutex_unlock(&xs->mutex); | |
394 | return err; | |
395 | } | |
396 | ||
397 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) | |
398 | { | |
ac98d8aa | 399 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
400 | struct sock *sk = sock->sk; |
401 | struct xdp_sock *xs = xdp_sk(sk); | |
402 | ||
42fddcc7 | 403 | if (unlikely(!xsk_is_bound(xs))) |
35fcde7f MK |
404 | return -ENXIO; |
405 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
406 | return -ENETDOWN; | |
6efb4436 MK |
407 | if (unlikely(!xs->tx)) |
408 | return -ENOBUFS; | |
ac98d8aa MK |
409 | if (need_wait) |
410 | return -EOPNOTSUPP; | |
35fcde7f | 411 | |
ac98d8aa | 412 | return (xs->zc) ? xsk_zc_xmit(sk) : xsk_generic_xmit(sk, m, total_len); |
35fcde7f MK |
413 | } |
414 | ||
a11e1d43 LT |
415 | static unsigned int xsk_poll(struct file *file, struct socket *sock, |
416 | struct poll_table_struct *wait) | |
c497176c | 417 | { |
a11e1d43 | 418 | unsigned int mask = datagram_poll(file, sock, wait); |
42fddcc7 BT |
419 | struct xdp_sock *xs = xdp_sk(sock->sk); |
420 | struct net_device *dev; | |
421 | struct xdp_umem *umem; | |
422 | ||
423 | if (unlikely(!xsk_is_bound(xs))) | |
424 | return mask; | |
425 | ||
426 | dev = xs->dev; | |
427 | umem = xs->umem; | |
77cd0d7b MK |
428 | |
429 | if (umem->need_wakeup) | |
430 | dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, | |
431 | umem->need_wakeup); | |
c497176c BT |
432 | |
433 | if (xs->rx && !xskq_empty_desc(xs->rx)) | |
434 | mask |= POLLIN | POLLRDNORM; | |
35fcde7f MK |
435 | if (xs->tx && !xskq_full_desc(xs->tx)) |
436 | mask |= POLLOUT | POLLWRNORM; | |
c497176c BT |
437 | |
438 | return mask; | |
439 | } | |
440 | ||
b9b6b68e BT |
441 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
442 | bool umem_queue) | |
423f3832 MK |
443 | { |
444 | struct xsk_queue *q; | |
445 | ||
446 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
447 | return -EINVAL; | |
448 | ||
b9b6b68e | 449 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
450 | if (!q) |
451 | return -ENOMEM; | |
452 | ||
37b07693 BT |
453 | /* Make sure queue is ready before it can be seen by others */ |
454 | smp_wmb(); | |
94a99763 | 455 | WRITE_ONCE(*queue, q); |
423f3832 MK |
456 | return 0; |
457 | } | |
458 | ||
455302d1 IM |
459 | static void xsk_unbind_dev(struct xdp_sock *xs) |
460 | { | |
461 | struct net_device *dev = xs->dev; | |
462 | ||
42fddcc7 | 463 | if (xs->state != XSK_BOUND) |
455302d1 | 464 | return; |
42fddcc7 | 465 | WRITE_ONCE(xs->state, XSK_UNBOUND); |
455302d1 IM |
466 | |
467 | /* Wait for driver to stop using the xdp socket. */ | |
468 | xdp_del_sk_umem(xs->umem, xs); | |
469 | xs->dev = NULL; | |
470 | synchronize_net(); | |
471 | dev_put(dev); | |
472 | } | |
473 | ||
0402acd6 BT |
474 | static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs, |
475 | struct xdp_sock ***map_entry) | |
476 | { | |
477 | struct xsk_map *map = NULL; | |
478 | struct xsk_map_node *node; | |
479 | ||
480 | *map_entry = NULL; | |
481 | ||
482 | spin_lock_bh(&xs->map_list_lock); | |
483 | node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node, | |
484 | node); | |
485 | if (node) { | |
486 | WARN_ON(xsk_map_inc(node->map)); | |
487 | map = node->map; | |
488 | *map_entry = node->map_entry; | |
489 | } | |
490 | spin_unlock_bh(&xs->map_list_lock); | |
491 | return map; | |
492 | } | |
493 | ||
494 | static void xsk_delete_from_maps(struct xdp_sock *xs) | |
495 | { | |
496 | /* This function removes the current XDP socket from all the | |
497 | * maps it resides in. We need to take extra care here, due to | |
498 | * the two locks involved. Each map has a lock synchronizing | |
499 | * updates to the entries, and each socket has a lock that | |
500 | * synchronizes access to the list of maps (map_list). For | |
501 | * deadlock avoidance the locks need to be taken in the order | |
502 | * "map lock"->"socket map list lock". We start off by | |
503 | * accessing the socket map list, and take a reference to the | |
504 | * map to guarantee existence between the | |
505 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete() | |
506 | * calls. Then we ask the map to remove the socket, which | |
507 | * tries to remove the socket from the map. Note that there | |
508 | * might be updates to the map between | |
509 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete(). | |
510 | */ | |
511 | struct xdp_sock **map_entry = NULL; | |
512 | struct xsk_map *map; | |
513 | ||
514 | while ((map = xsk_get_map_list_entry(xs, &map_entry))) { | |
515 | xsk_map_try_sock_delete(map, xs, map_entry); | |
516 | xsk_map_put(map); | |
517 | } | |
518 | } | |
519 | ||
c0c77d8f BT |
520 | static int xsk_release(struct socket *sock) |
521 | { | |
522 | struct sock *sk = sock->sk; | |
965a9909 | 523 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
524 | struct net *net; |
525 | ||
526 | if (!sk) | |
527 | return 0; | |
528 | ||
529 | net = sock_net(sk); | |
530 | ||
1d0dc069 BT |
531 | mutex_lock(&net->xdp.lock); |
532 | sk_del_node_init_rcu(sk); | |
533 | mutex_unlock(&net->xdp.lock); | |
534 | ||
c0c77d8f BT |
535 | local_bh_disable(); |
536 | sock_prot_inuse_add(net, sk->sk_prot, -1); | |
537 | local_bh_enable(); | |
538 | ||
0402acd6 | 539 | xsk_delete_from_maps(xs); |
42fddcc7 | 540 | mutex_lock(&xs->mutex); |
455302d1 | 541 | xsk_unbind_dev(xs); |
42fddcc7 | 542 | mutex_unlock(&xs->mutex); |
965a9909 | 543 | |
541d7fdd BT |
544 | xskq_destroy(xs->rx); |
545 | xskq_destroy(xs->tx); | |
546 | ||
c0c77d8f BT |
547 | sock_orphan(sk); |
548 | sock->sk = NULL; | |
549 | ||
550 | sk_refcnt_debug_release(sk); | |
551 | sock_put(sk); | |
552 | ||
553 | return 0; | |
554 | } | |
555 | ||
965a9909 MK |
556 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
557 | { | |
558 | struct socket *sock; | |
559 | int err; | |
560 | ||
561 | sock = sockfd_lookup(fd, &err); | |
562 | if (!sock) | |
563 | return ERR_PTR(-ENOTSOCK); | |
564 | ||
565 | if (sock->sk->sk_family != PF_XDP) { | |
566 | sockfd_put(sock); | |
567 | return ERR_PTR(-ENOPROTOOPT); | |
568 | } | |
569 | ||
570 | return sock; | |
571 | } | |
572 | ||
c05cd364 KL |
573 | /* Check if umem pages are contiguous. |
574 | * If zero-copy mode, use the DMA address to do the page contiguity check | |
575 | * For all other modes we use addr (kernel virtual address) | |
576 | * Store the result in the low bits of addr. | |
577 | */ | |
578 | static void xsk_check_page_contiguity(struct xdp_umem *umem, u32 flags) | |
579 | { | |
580 | struct xdp_umem_page *pgs = umem->pages; | |
581 | int i, is_contig; | |
582 | ||
583 | for (i = 0; i < umem->npgs - 1; i++) { | |
584 | is_contig = (flags & XDP_ZEROCOPY) ? | |
585 | (pgs[i].dma + PAGE_SIZE == pgs[i + 1].dma) : | |
586 | (pgs[i].addr + PAGE_SIZE == pgs[i + 1].addr); | |
587 | pgs[i].addr += is_contig << XSK_NEXT_PG_CONTIG_SHIFT; | |
588 | } | |
589 | } | |
590 | ||
965a9909 MK |
591 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
592 | { | |
593 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
594 | struct sock *sk = sock->sk; | |
965a9909 | 595 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 596 | struct net_device *dev; |
173d3adb | 597 | u32 flags, qid; |
965a9909 MK |
598 | int err = 0; |
599 | ||
600 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
601 | return -EINVAL; | |
602 | if (sxdp->sxdp_family != AF_XDP) | |
603 | return -EINVAL; | |
604 | ||
f54ba391 | 605 | flags = sxdp->sxdp_flags; |
77cd0d7b MK |
606 | if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY | |
607 | XDP_USE_NEED_WAKEUP)) | |
f54ba391 BT |
608 | return -EINVAL; |
609 | ||
5464c3a0 | 610 | rtnl_lock(); |
965a9909 | 611 | mutex_lock(&xs->mutex); |
455302d1 | 612 | if (xs->state != XSK_READY) { |
959b71db BT |
613 | err = -EBUSY; |
614 | goto out_release; | |
615 | } | |
616 | ||
965a9909 MK |
617 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
618 | if (!dev) { | |
619 | err = -ENODEV; | |
620 | goto out_release; | |
621 | } | |
622 | ||
f6145903 | 623 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
624 | err = -EINVAL; |
625 | goto out_unlock; | |
626 | } | |
627 | ||
173d3adb | 628 | qid = sxdp->sxdp_queue_id; |
173d3adb BT |
629 | |
630 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
631 | struct xdp_sock *umem_xs; |
632 | struct socket *sock; | |
633 | ||
77cd0d7b MK |
634 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) || |
635 | (flags & XDP_USE_NEED_WAKEUP)) { | |
173d3adb BT |
636 | /* Cannot specify flags for shared sockets. */ |
637 | err = -EINVAL; | |
638 | goto out_unlock; | |
639 | } | |
640 | ||
965a9909 MK |
641 | if (xs->umem) { |
642 | /* We have already our own. */ | |
643 | err = -EINVAL; | |
644 | goto out_unlock; | |
645 | } | |
646 | ||
647 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
648 | if (IS_ERR(sock)) { | |
649 | err = PTR_ERR(sock); | |
650 | goto out_unlock; | |
651 | } | |
652 | ||
653 | umem_xs = xdp_sk(sock->sk); | |
42fddcc7 | 654 | if (!xsk_is_bound(umem_xs)) { |
965a9909 MK |
655 | err = -EBADF; |
656 | sockfd_put(sock); | |
657 | goto out_unlock; | |
42fddcc7 BT |
658 | } |
659 | if (umem_xs->dev != dev || umem_xs->queue_id != qid) { | |
965a9909 MK |
660 | err = -EINVAL; |
661 | sockfd_put(sock); | |
662 | goto out_unlock; | |
663 | } | |
664 | ||
665 | xdp_get_umem(umem_xs->umem); | |
9764f4b3 | 666 | WRITE_ONCE(xs->umem, umem_xs->umem); |
965a9909 MK |
667 | sockfd_put(sock); |
668 | } else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) { | |
669 | err = -EINVAL; | |
670 | goto out_unlock; | |
c497176c BT |
671 | } else { |
672 | /* This xsk has its own umem. */ | |
93ee30f3 MK |
673 | xskq_set_umem(xs->umem->fq, xs->umem->size, |
674 | xs->umem->chunk_mask); | |
675 | xskq_set_umem(xs->umem->cq, xs->umem->size, | |
676 | xs->umem->chunk_mask); | |
173d3adb BT |
677 | |
678 | err = xdp_umem_assign_dev(xs->umem, dev, qid, flags); | |
679 | if (err) | |
680 | goto out_unlock; | |
c05cd364 KL |
681 | |
682 | xsk_check_page_contiguity(xs->umem, flags); | |
965a9909 MK |
683 | } |
684 | ||
965a9909 | 685 | xs->dev = dev; |
ac98d8aa MK |
686 | xs->zc = xs->umem->zc; |
687 | xs->queue_id = qid; | |
93ee30f3 MK |
688 | xskq_set_umem(xs->rx, xs->umem->size, xs->umem->chunk_mask); |
689 | xskq_set_umem(xs->tx, xs->umem->size, xs->umem->chunk_mask); | |
ac98d8aa | 690 | xdp_add_sk_umem(xs->umem, xs); |
965a9909 MK |
691 | |
692 | out_unlock: | |
42fddcc7 | 693 | if (err) { |
965a9909 | 694 | dev_put(dev); |
42fddcc7 BT |
695 | } else { |
696 | /* Matches smp_rmb() in bind() for shared umem | |
697 | * sockets, and xsk_is_bound(). | |
698 | */ | |
699 | smp_wmb(); | |
700 | WRITE_ONCE(xs->state, XSK_BOUND); | |
701 | } | |
965a9909 MK |
702 | out_release: |
703 | mutex_unlock(&xs->mutex); | |
5464c3a0 | 704 | rtnl_unlock(); |
965a9909 MK |
705 | return err; |
706 | } | |
707 | ||
c05cd364 KL |
708 | struct xdp_umem_reg_v1 { |
709 | __u64 addr; /* Start of packet data area */ | |
710 | __u64 len; /* Length of packet data area */ | |
711 | __u32 chunk_size; | |
712 | __u32 headroom; | |
713 | }; | |
714 | ||
c0c77d8f BT |
715 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
716 | char __user *optval, unsigned int optlen) | |
717 | { | |
718 | struct sock *sk = sock->sk; | |
719 | struct xdp_sock *xs = xdp_sk(sk); | |
720 | int err; | |
721 | ||
722 | if (level != SOL_XDP) | |
723 | return -ENOPROTOOPT; | |
724 | ||
725 | switch (optname) { | |
b9b6b68e | 726 | case XDP_RX_RING: |
f6145903 | 727 | case XDP_TX_RING: |
b9b6b68e BT |
728 | { |
729 | struct xsk_queue **q; | |
730 | int entries; | |
731 | ||
732 | if (optlen < sizeof(entries)) | |
733 | return -EINVAL; | |
734 | if (copy_from_user(&entries, optval, sizeof(entries))) | |
735 | return -EFAULT; | |
736 | ||
737 | mutex_lock(&xs->mutex); | |
455302d1 IM |
738 | if (xs->state != XSK_READY) { |
739 | mutex_unlock(&xs->mutex); | |
740 | return -EBUSY; | |
741 | } | |
f6145903 | 742 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e | 743 | err = xsk_init_queue(entries, q, false); |
77cd0d7b MK |
744 | if (!err && optname == XDP_TX_RING) |
745 | /* Tx needs to be explicitly woken up the first time */ | |
746 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; | |
b9b6b68e BT |
747 | mutex_unlock(&xs->mutex); |
748 | return err; | |
749 | } | |
c0c77d8f BT |
750 | case XDP_UMEM_REG: |
751 | { | |
c05cd364 KL |
752 | size_t mr_size = sizeof(struct xdp_umem_reg); |
753 | struct xdp_umem_reg mr = {}; | |
c0c77d8f BT |
754 | struct xdp_umem *umem; |
755 | ||
c05cd364 KL |
756 | if (optlen < sizeof(struct xdp_umem_reg_v1)) |
757 | return -EINVAL; | |
758 | else if (optlen < sizeof(mr)) | |
759 | mr_size = sizeof(struct xdp_umem_reg_v1); | |
760 | ||
761 | if (copy_from_user(&mr, optval, mr_size)) | |
c0c77d8f BT |
762 | return -EFAULT; |
763 | ||
764 | mutex_lock(&xs->mutex); | |
455302d1 | 765 | if (xs->state != XSK_READY || xs->umem) { |
a49049ea BT |
766 | mutex_unlock(&xs->mutex); |
767 | return -EBUSY; | |
768 | } | |
c0c77d8f | 769 | |
a49049ea BT |
770 | umem = xdp_umem_create(&mr); |
771 | if (IS_ERR(umem)) { | |
c0c77d8f | 772 | mutex_unlock(&xs->mutex); |
a49049ea | 773 | return PTR_ERR(umem); |
c0c77d8f BT |
774 | } |
775 | ||
776 | /* Make sure umem is ready before it can be seen by others */ | |
777 | smp_wmb(); | |
9764f4b3 | 778 | WRITE_ONCE(xs->umem, umem); |
c0c77d8f BT |
779 | mutex_unlock(&xs->mutex); |
780 | return 0; | |
781 | } | |
423f3832 | 782 | case XDP_UMEM_FILL_RING: |
fe230832 | 783 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
784 | { |
785 | struct xsk_queue **q; | |
786 | int entries; | |
787 | ||
423f3832 MK |
788 | if (copy_from_user(&entries, optval, sizeof(entries))) |
789 | return -EFAULT; | |
790 | ||
791 | mutex_lock(&xs->mutex); | |
455302d1 IM |
792 | if (xs->state != XSK_READY) { |
793 | mutex_unlock(&xs->mutex); | |
794 | return -EBUSY; | |
795 | } | |
a49049ea BT |
796 | if (!xs->umem) { |
797 | mutex_unlock(&xs->mutex); | |
798 | return -EINVAL; | |
799 | } | |
800 | ||
fe230832 MK |
801 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq : |
802 | &xs->umem->cq; | |
b9b6b68e | 803 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
804 | mutex_unlock(&xs->mutex); |
805 | return err; | |
806 | } | |
c0c77d8f BT |
807 | default: |
808 | break; | |
809 | } | |
810 | ||
811 | return -ENOPROTOOPT; | |
812 | } | |
813 | ||
77cd0d7b MK |
814 | static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring) |
815 | { | |
816 | ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
817 | ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
818 | ring->desc = offsetof(struct xdp_rxtx_ring, desc); | |
819 | } | |
820 | ||
821 | static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring) | |
822 | { | |
823 | ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
824 | ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
825 | ring->desc = offsetof(struct xdp_umem_ring, desc); | |
826 | } | |
827 | ||
af75d9e0 MK |
828 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
829 | char __user *optval, int __user *optlen) | |
830 | { | |
831 | struct sock *sk = sock->sk; | |
832 | struct xdp_sock *xs = xdp_sk(sk); | |
833 | int len; | |
834 | ||
835 | if (level != SOL_XDP) | |
836 | return -ENOPROTOOPT; | |
837 | ||
838 | if (get_user(len, optlen)) | |
839 | return -EFAULT; | |
840 | if (len < 0) | |
841 | return -EINVAL; | |
842 | ||
843 | switch (optname) { | |
844 | case XDP_STATISTICS: | |
845 | { | |
846 | struct xdp_statistics stats; | |
847 | ||
848 | if (len < sizeof(stats)) | |
849 | return -EINVAL; | |
850 | ||
851 | mutex_lock(&xs->mutex); | |
852 | stats.rx_dropped = xs->rx_dropped; | |
853 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); | |
854 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
855 | mutex_unlock(&xs->mutex); | |
856 | ||
857 | if (copy_to_user(optval, &stats, sizeof(stats))) | |
858 | return -EFAULT; | |
859 | if (put_user(sizeof(stats), optlen)) | |
860 | return -EFAULT; | |
861 | ||
862 | return 0; | |
863 | } | |
b3a9e0be BT |
864 | case XDP_MMAP_OFFSETS: |
865 | { | |
866 | struct xdp_mmap_offsets off; | |
77cd0d7b MK |
867 | struct xdp_mmap_offsets_v1 off_v1; |
868 | bool flags_supported = true; | |
869 | void *to_copy; | |
b3a9e0be | 870 | |
77cd0d7b | 871 | if (len < sizeof(off_v1)) |
b3a9e0be | 872 | return -EINVAL; |
77cd0d7b MK |
873 | else if (len < sizeof(off)) |
874 | flags_supported = false; | |
875 | ||
876 | if (flags_supported) { | |
877 | /* xdp_ring_offset is identical to xdp_ring_offset_v1 | |
878 | * except for the flags field added to the end. | |
879 | */ | |
880 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
881 | &off.rx); | |
882 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
883 | &off.tx); | |
884 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
885 | &off.fr); | |
886 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
887 | &off.cr); | |
888 | off.rx.flags = offsetof(struct xdp_rxtx_ring, | |
889 | ptrs.flags); | |
890 | off.tx.flags = offsetof(struct xdp_rxtx_ring, | |
891 | ptrs.flags); | |
892 | off.fr.flags = offsetof(struct xdp_umem_ring, | |
893 | ptrs.flags); | |
894 | off.cr.flags = offsetof(struct xdp_umem_ring, | |
895 | ptrs.flags); | |
896 | ||
897 | len = sizeof(off); | |
898 | to_copy = &off; | |
899 | } else { | |
900 | xsk_enter_rxtx_offsets(&off_v1.rx); | |
901 | xsk_enter_rxtx_offsets(&off_v1.tx); | |
902 | xsk_enter_umem_offsets(&off_v1.fr); | |
903 | xsk_enter_umem_offsets(&off_v1.cr); | |
904 | ||
905 | len = sizeof(off_v1); | |
906 | to_copy = &off_v1; | |
907 | } | |
b3a9e0be | 908 | |
77cd0d7b | 909 | if (copy_to_user(optval, to_copy, len)) |
b3a9e0be BT |
910 | return -EFAULT; |
911 | if (put_user(len, optlen)) | |
912 | return -EFAULT; | |
913 | ||
914 | return 0; | |
915 | } | |
2640d3c8 MM |
916 | case XDP_OPTIONS: |
917 | { | |
918 | struct xdp_options opts = {}; | |
919 | ||
920 | if (len < sizeof(opts)) | |
921 | return -EINVAL; | |
922 | ||
923 | mutex_lock(&xs->mutex); | |
924 | if (xs->zc) | |
925 | opts.flags |= XDP_OPTIONS_ZEROCOPY; | |
926 | mutex_unlock(&xs->mutex); | |
927 | ||
928 | len = sizeof(opts); | |
929 | if (copy_to_user(optval, &opts, len)) | |
930 | return -EFAULT; | |
931 | if (put_user(len, optlen)) | |
932 | return -EFAULT; | |
933 | ||
934 | return 0; | |
935 | } | |
af75d9e0 MK |
936 | default: |
937 | break; | |
938 | } | |
939 | ||
940 | return -EOPNOTSUPP; | |
941 | } | |
942 | ||
423f3832 MK |
943 | static int xsk_mmap(struct file *file, struct socket *sock, |
944 | struct vm_area_struct *vma) | |
945 | { | |
a5a16e43 | 946 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
947 | unsigned long size = vma->vm_end - vma->vm_start; |
948 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
949 | struct xsk_queue *q = NULL; | |
37b07693 | 950 | struct xdp_umem *umem; |
423f3832 MK |
951 | unsigned long pfn; |
952 | struct page *qpg; | |
953 | ||
42fddcc7 | 954 | if (READ_ONCE(xs->state) != XSK_READY) |
455302d1 IM |
955 | return -EBUSY; |
956 | ||
b9b6b68e | 957 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 958 | q = READ_ONCE(xs->rx); |
f6145903 | 959 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 960 | q = READ_ONCE(xs->tx); |
b9b6b68e | 961 | } else { |
37b07693 BT |
962 | umem = READ_ONCE(xs->umem); |
963 | if (!umem) | |
b9b6b68e | 964 | return -EINVAL; |
423f3832 | 965 | |
e6762c8b MK |
966 | /* Matches the smp_wmb() in XDP_UMEM_REG */ |
967 | smp_rmb(); | |
b9b6b68e | 968 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
37b07693 | 969 | q = READ_ONCE(umem->fq); |
fe230832 | 970 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
37b07693 | 971 | q = READ_ONCE(umem->cq); |
b9b6b68e | 972 | } |
423f3832 MK |
973 | |
974 | if (!q) | |
975 | return -EINVAL; | |
976 | ||
e6762c8b MK |
977 | /* Matches the smp_wmb() in xsk_init_queue */ |
978 | smp_rmb(); | |
423f3832 | 979 | qpg = virt_to_head_page(q->ring); |
a50b854e | 980 | if (size > page_size(qpg)) |
423f3832 MK |
981 | return -EINVAL; |
982 | ||
983 | pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; | |
984 | return remap_pfn_range(vma, vma->vm_start, pfn, | |
985 | size, vma->vm_page_prot); | |
986 | } | |
987 | ||
455302d1 IM |
988 | static int xsk_notifier(struct notifier_block *this, |
989 | unsigned long msg, void *ptr) | |
990 | { | |
991 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
992 | struct net *net = dev_net(dev); | |
993 | struct sock *sk; | |
994 | ||
995 | switch (msg) { | |
996 | case NETDEV_UNREGISTER: | |
997 | mutex_lock(&net->xdp.lock); | |
998 | sk_for_each(sk, &net->xdp.list) { | |
999 | struct xdp_sock *xs = xdp_sk(sk); | |
1000 | ||
1001 | mutex_lock(&xs->mutex); | |
1002 | if (xs->dev == dev) { | |
1003 | sk->sk_err = ENETDOWN; | |
1004 | if (!sock_flag(sk, SOCK_DEAD)) | |
1005 | sk->sk_error_report(sk); | |
1006 | ||
1007 | xsk_unbind_dev(xs); | |
1008 | ||
1009 | /* Clear device references in umem. */ | |
1010 | xdp_umem_clear_dev(xs->umem); | |
1011 | } | |
1012 | mutex_unlock(&xs->mutex); | |
1013 | } | |
1014 | mutex_unlock(&net->xdp.lock); | |
1015 | break; | |
1016 | } | |
1017 | return NOTIFY_DONE; | |
1018 | } | |
1019 | ||
c0c77d8f BT |
1020 | static struct proto xsk_proto = { |
1021 | .name = "XDP", | |
1022 | .owner = THIS_MODULE, | |
1023 | .obj_size = sizeof(struct xdp_sock), | |
1024 | }; | |
1025 | ||
1026 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
1027 | .family = PF_XDP, |
1028 | .owner = THIS_MODULE, | |
1029 | .release = xsk_release, | |
1030 | .bind = xsk_bind, | |
1031 | .connect = sock_no_connect, | |
1032 | .socketpair = sock_no_socketpair, | |
1033 | .accept = sock_no_accept, | |
1034 | .getname = sock_no_getname, | |
a11e1d43 | 1035 | .poll = xsk_poll, |
c2f4374b BT |
1036 | .ioctl = sock_no_ioctl, |
1037 | .listen = sock_no_listen, | |
1038 | .shutdown = sock_no_shutdown, | |
1039 | .setsockopt = xsk_setsockopt, | |
1040 | .getsockopt = xsk_getsockopt, | |
1041 | .sendmsg = xsk_sendmsg, | |
1042 | .recvmsg = sock_no_recvmsg, | |
1043 | .mmap = xsk_mmap, | |
1044 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
1045 | }; |
1046 | ||
11fe9262 BT |
1047 | static void xsk_destruct(struct sock *sk) |
1048 | { | |
1049 | struct xdp_sock *xs = xdp_sk(sk); | |
1050 | ||
1051 | if (!sock_flag(sk, SOCK_DEAD)) | |
1052 | return; | |
1053 | ||
1054 | xdp_put_umem(xs->umem); | |
1055 | ||
1056 | sk_refcnt_debug_dec(sk); | |
1057 | } | |
1058 | ||
c0c77d8f BT |
1059 | static int xsk_create(struct net *net, struct socket *sock, int protocol, |
1060 | int kern) | |
1061 | { | |
1062 | struct sock *sk; | |
1063 | struct xdp_sock *xs; | |
1064 | ||
1065 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
1066 | return -EPERM; | |
1067 | if (sock->type != SOCK_RAW) | |
1068 | return -ESOCKTNOSUPPORT; | |
1069 | ||
1070 | if (protocol) | |
1071 | return -EPROTONOSUPPORT; | |
1072 | ||
1073 | sock->state = SS_UNCONNECTED; | |
1074 | ||
1075 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
1076 | if (!sk) | |
1077 | return -ENOBUFS; | |
1078 | ||
1079 | sock->ops = &xsk_proto_ops; | |
1080 | ||
1081 | sock_init_data(sock, sk); | |
1082 | ||
1083 | sk->sk_family = PF_XDP; | |
1084 | ||
11fe9262 BT |
1085 | sk->sk_destruct = xsk_destruct; |
1086 | sk_refcnt_debug_inc(sk); | |
1087 | ||
cee27167 BT |
1088 | sock_set_flag(sk, SOCK_RCU_FREE); |
1089 | ||
c0c77d8f | 1090 | xs = xdp_sk(sk); |
455302d1 | 1091 | xs->state = XSK_READY; |
c0c77d8f | 1092 | mutex_init(&xs->mutex); |
bf0bdd13 | 1093 | spin_lock_init(&xs->rx_lock); |
a9744f7c | 1094 | spin_lock_init(&xs->tx_completion_lock); |
c0c77d8f | 1095 | |
0402acd6 BT |
1096 | INIT_LIST_HEAD(&xs->map_list); |
1097 | spin_lock_init(&xs->map_list_lock); | |
1098 | ||
1d0dc069 BT |
1099 | mutex_lock(&net->xdp.lock); |
1100 | sk_add_node_rcu(sk, &net->xdp.list); | |
1101 | mutex_unlock(&net->xdp.lock); | |
1102 | ||
c0c77d8f BT |
1103 | local_bh_disable(); |
1104 | sock_prot_inuse_add(net, &xsk_proto, 1); | |
1105 | local_bh_enable(); | |
1106 | ||
1107 | return 0; | |
1108 | } | |
1109 | ||
1110 | static const struct net_proto_family xsk_family_ops = { | |
1111 | .family = PF_XDP, | |
1112 | .create = xsk_create, | |
1113 | .owner = THIS_MODULE, | |
1114 | }; | |
1115 | ||
455302d1 IM |
1116 | static struct notifier_block xsk_netdev_notifier = { |
1117 | .notifier_call = xsk_notifier, | |
1118 | }; | |
1119 | ||
1d0dc069 BT |
1120 | static int __net_init xsk_net_init(struct net *net) |
1121 | { | |
1122 | mutex_init(&net->xdp.lock); | |
1123 | INIT_HLIST_HEAD(&net->xdp.list); | |
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | static void __net_exit xsk_net_exit(struct net *net) | |
1128 | { | |
1129 | WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); | |
1130 | } | |
1131 | ||
1132 | static struct pernet_operations xsk_net_ops = { | |
1133 | .init = xsk_net_init, | |
1134 | .exit = xsk_net_exit, | |
1135 | }; | |
1136 | ||
c0c77d8f BT |
1137 | static int __init xsk_init(void) |
1138 | { | |
1139 | int err; | |
1140 | ||
1141 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
1142 | if (err) | |
1143 | goto out; | |
1144 | ||
1145 | err = sock_register(&xsk_family_ops); | |
1146 | if (err) | |
1147 | goto out_proto; | |
1148 | ||
1d0dc069 BT |
1149 | err = register_pernet_subsys(&xsk_net_ops); |
1150 | if (err) | |
1151 | goto out_sk; | |
455302d1 IM |
1152 | |
1153 | err = register_netdevice_notifier(&xsk_netdev_notifier); | |
1154 | if (err) | |
1155 | goto out_pernet; | |
1156 | ||
c0c77d8f BT |
1157 | return 0; |
1158 | ||
455302d1 IM |
1159 | out_pernet: |
1160 | unregister_pernet_subsys(&xsk_net_ops); | |
1d0dc069 BT |
1161 | out_sk: |
1162 | sock_unregister(PF_XDP); | |
c0c77d8f BT |
1163 | out_proto: |
1164 | proto_unregister(&xsk_proto); | |
1165 | out: | |
1166 | return err; | |
1167 | } | |
1168 | ||
1169 | fs_initcall(xsk_init); |